<div class="xblock xblock-public_view xblock-public_view-vertical" data-init="VerticalStudentView" data-course-id="course-v1:MITx+3.15.2x+2T2017" data-request-token="bfd4f78aed6a11eeb91516ffd59041e1" data-graded="True" data-usage-id="block-v1:MITx+3.15.2x+2T2017+type@vertical+block@2b1962801ac74e71aff84c18d93acec4" data-block-type="vertical" data-runtime-class="LmsRuntime" data-runtime-version="1" data-has-score="False">
<h2 class="hd hd-2 unit-title">Problem 3.1</h2>
<div class="vert-mod">
<div class="vert vert-0" data-id="block-v1:MITx+3.15.2x+2T2017+type@html+block@3775f4575c6b4828a8884544e7f9ceba">
<div class="xblock xblock-public_view xblock-public_view-html xmodule_display xmodule_HtmlBlock" data-init="XBlockToXModuleShim" data-course-id="course-v1:MITx+3.15.2x+2T2017" data-request-token="bfd4f78aed6a11eeb91516ffd59041e1" data-graded="True" data-usage-id="block-v1:MITx+3.15.2x+2T2017+type@html+block@3775f4575c6b4828a8884544e7f9ceba" data-block-type="html" data-runtime-class="LmsRuntime" data-runtime-version="1" data-has-score="False">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "HTMLModule"}
</script>
<h2>Problem 3.1</h2>
<p>We want to design an optical surgery system to deliver an intense beam of near-UV light (\(3.2 eV\) energy) within the body. Assume that we want to generate this light using a semiconductor laser. We have several potential options for materials for the active layer, the cladding, and the substrate.</p>
<p>Below you will find several potential options for active layer materials. Determine the appropriate composition for each of the options that will give the desired behavior. Then, select an appropriate cladding materials for each of the active layer options.</p>
<p>You will need to use the property maps found in the <a href="/assets/courseware/v1/ef69977938a3c00083019014685b3f4c/asset-v1:MITx+3.15.2x+2T2017+type@asset+block/HO6_LEDs_and_Lasers.pdf" target="[object Object]">Week 2 Handouts</a> to answer this question.</p>
</div>
</div>
<div class="vert vert-1" data-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@c8208bcd347540309404f74765462e4e">
<div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-init="XBlockToXModuleShim" data-course-id="course-v1:MITx+3.15.2x+2T2017" data-request-token="bfd4f78aed6a11eeb91516ffd59041e1" data-graded="True" data-usage-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@c8208bcd347540309404f74765462e4e" data-block-type="problem" data-runtime-class="LmsRuntime" data-runtime-version="1" data-has-score="True">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Problem"}
</script>
<div id="problem_c8208bcd347540309404f74765462e4e" class="problems-wrapper" role="group"
aria-labelledby="c8208bcd347540309404f74765462e4e-problem-title"
data-problem-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@c8208bcd347540309404f74765462e4e" data-url="/courses/course-v1:MITx+3.15.2x+2T2017/xblock/block-v1:MITx+3.15.2x+2T2017+type@problem+block@c8208bcd347540309404f74765462e4e/handler/xmodule_handler"
data-problem-score="0"
data-problem-total-possible="6"
data-attempts-used="0"
data-content="
<h3 class="hd hd-3 problem-header" id="c8208bcd347540309404f74765462e4e-problem-title" aria-describedby="block-v1:MITx+3.15.2x+2T2017+type@problem+block@c8208bcd347540309404f74765462e4e-problem-progress" tabindex="-1">
problem
</h3>
<div class="problem-progress" id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@c8208bcd347540309404f74765462e4e-problem-progress"></div>
<div class="problem">
<div>
<b>Part A</b>
<br/>
<br/>
<b>Combination 1:</b>
<p>Active Layer #1: (Mn<small><sub>x</sub></small>Zn<sub>1-x</sub>)Se</p>
<p>x = </p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div id="formulaequationinput_c8208bcd347540309404f74765462e4e_2_1" class="inputtype formulaequationinput">
<div class="unanswered">
<input type="text" name="input_c8208bcd347540309404f74765462e4e_2_1" id="input_c8208bcd347540309404f74765462e4e_2_1" data-input-id="c8208bcd347540309404f74765462e4e_2_1" value="" aria-describedby="status_c8208bcd347540309404f74765462e4e_2_1" size="20"/>
<span class="trailing_text" id="trailing_text_c8208bcd347540309404f74765462e4e_2_1"/>
<span class="status unanswered" id="status_c8208bcd347540309404f74765462e4e_2_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
<p id="answer_c8208bcd347540309404f74765462e4e_2_1" class="answer"/>
<div id="input_c8208bcd347540309404f74765462e4e_2_1_preview" class="equation">
\(\)
<img src="/static/images/spinner.bc34f953403f.gif" class="loading" alt="Loading"/>
</div>
</div>
<div class="script_placeholder" data-src="/static/js/capa/src/formula_equation_preview.b1967ab28c31.js"/>
</div></div>
<p>Cladding #1:</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 2" role="group"><div class="inputtype option-input ">
<select name="input_c8208bcd347540309404f74765462e4e_3_1" id="input_c8208bcd347540309404f74765462e4e_3_1" aria-describedby="status_c8208bcd347540309404f74765462e4e_3_1">
<option value="option_c8208bcd347540309404f74765462e4e_3_1_dummy_default">Select an option</option>
<option value="MnTe"> MnTe</option>
<option value="InP"> InP</option>
<option value="CdS"> CdS</option>
<option value="MnSe"> MnSe</option>
</select>
<div class="indicator-container">
<span class="status unanswered" id="status_c8208bcd347540309404f74765462e4e_3_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
</div>
<p class="answer" id="answer_c8208bcd347540309404f74765462e4e_3_1"/>
</div></div>
<b> Combination 2:</b>
<p>Active Layer #2: (MnSe)<sub>x</sub>(InP)<sub>1-x</sub></p>
<p>x = </p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 3" role="group"><div id="formulaequationinput_c8208bcd347540309404f74765462e4e_4_1" class="inputtype formulaequationinput">
<div class="unanswered">
<input type="text" name="input_c8208bcd347540309404f74765462e4e_4_1" id="input_c8208bcd347540309404f74765462e4e_4_1" data-input-id="c8208bcd347540309404f74765462e4e_4_1" value="" aria-describedby="status_c8208bcd347540309404f74765462e4e_4_1" size="20"/>
<span class="trailing_text" id="trailing_text_c8208bcd347540309404f74765462e4e_4_1"/>
<span class="status unanswered" id="status_c8208bcd347540309404f74765462e4e_4_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
<p id="answer_c8208bcd347540309404f74765462e4e_4_1" class="answer"/>
<div id="input_c8208bcd347540309404f74765462e4e_4_1_preview" class="equation">
\(\)
<img src="/static/images/spinner.bc34f953403f.gif" class="loading" alt="Loading"/>
</div>
</div>
<div class="script_placeholder" data-src="/static/js/capa/src/formula_equation_preview.b1967ab28c31.js"/>
</div></div>
<p>Cladding #2:</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 4" role="group"><div class="inputtype option-input ">
<select name="input_c8208bcd347540309404f74765462e4e_5_1" id="input_c8208bcd347540309404f74765462e4e_5_1" aria-describedby="status_c8208bcd347540309404f74765462e4e_5_1">
<option value="option_c8208bcd347540309404f74765462e4e_5_1_dummy_default">Select an option</option>
<option value="MnTe"> MnTe</option>
<option value="InP"> InP</option>
<option value="CdS"> CdS</option>
<option value="MnSe"> MnSe</option>
</select>
<div class="indicator-container">
<span class="status unanswered" id="status_c8208bcd347540309404f74765462e4e_5_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
</div>
<p class="answer" id="answer_c8208bcd347540309404f74765462e4e_5_1"/>
</div></div>
<b>Combination 3:</b>
<p>Active Layer #3: (Mn<sub>x</sub>Zn<sub>1-x</sub>)Te</p>
<p>x = </p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 5" role="group"><div id="formulaequationinput_c8208bcd347540309404f74765462e4e_6_1" class="inputtype formulaequationinput">
<div class="unanswered">
<input type="text" name="input_c8208bcd347540309404f74765462e4e_6_1" id="input_c8208bcd347540309404f74765462e4e_6_1" data-input-id="c8208bcd347540309404f74765462e4e_6_1" value="" aria-describedby="status_c8208bcd347540309404f74765462e4e_6_1" size="20"/>
<span class="trailing_text" id="trailing_text_c8208bcd347540309404f74765462e4e_6_1"/>
<span class="status unanswered" id="status_c8208bcd347540309404f74765462e4e_6_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
<p id="answer_c8208bcd347540309404f74765462e4e_6_1" class="answer"/>
<div id="input_c8208bcd347540309404f74765462e4e_6_1_preview" class="equation">
\(\)
<img src="/static/images/spinner.bc34f953403f.gif" class="loading" alt="Loading"/>
</div>
</div>
<div class="script_placeholder" data-src="/static/js/capa/src/formula_equation_preview.b1967ab28c31.js"/>
</div></div>
<p>Cladding #3:</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 6" role="group"><div class="inputtype option-input ">
<select name="input_c8208bcd347540309404f74765462e4e_7_1" id="input_c8208bcd347540309404f74765462e4e_7_1" aria-describedby="status_c8208bcd347540309404f74765462e4e_7_1">
<option value="option_c8208bcd347540309404f74765462e4e_7_1_dummy_default">Select an option</option>
<option value="MnTe"> MnTe</option>
<option value="InP"> InP</option>
<option value="CdS"> CdS</option>
<option value="MnSe"> MnSe</option>
</select>
<div class="indicator-container">
<span class="status unanswered" id="status_c8208bcd347540309404f74765462e4e_7_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
</div>
<p class="answer" id="answer_c8208bcd347540309404f74765462e4e_7_1"/>
</div></div>
<div class="solution-span">
<span id="solution_c8208bcd347540309404f74765462e4e_solution_1"/>
</div></div>
<div class="action">
<input type="hidden" name="problem_id" value="problem" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_c8208bcd347540309404f74765462e4e" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_c8208bcd347540309404f74765462e4e">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
</div>
<div class="problem-action-buttons-wrapper">
</div>
</div>
<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="c8208bcd347540309404f74765462e4e-problem-title">
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="c8208bcd347540309404f74765462e4e-problem-title">None
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification general notification-show-answer
is-hidden"
tabindex="-1">
<span class="icon fa fa-info-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="c8208bcd347540309404f74765462e4e-problem-title">Answers are displayed within the problem
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
</div>
"
data-graded="True">
<p class="loading-spinner">
<i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i>
<span class="sr">Loading…</span>
</p>
</div>
</div>
</div>
<div class="vert vert-2" data-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@42c91359d7294140bdfd231f6d5ca586">
<div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-init="XBlockToXModuleShim" data-course-id="course-v1:MITx+3.15.2x+2T2017" data-request-token="bfd4f78aed6a11eeb91516ffd59041e1" data-graded="True" data-usage-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@42c91359d7294140bdfd231f6d5ca586" data-block-type="problem" data-runtime-class="LmsRuntime" data-runtime-version="1" data-has-score="True">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Problem"}
</script>
<div id="problem_42c91359d7294140bdfd231f6d5ca586" class="problems-wrapper" role="group"
aria-labelledby="42c91359d7294140bdfd231f6d5ca586-problem-title"
data-problem-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@42c91359d7294140bdfd231f6d5ca586" data-url="/courses/course-v1:MITx+3.15.2x+2T2017/xblock/block-v1:MITx+3.15.2x+2T2017+type@problem+block@42c91359d7294140bdfd231f6d5ca586/handler/xmodule_handler"
data-problem-score="0"
data-problem-total-possible="2"
data-attempts-used="0"
data-content="
<h3 class="hd hd-3 problem-header" id="42c91359d7294140bdfd231f6d5ca586-problem-title" aria-describedby="block-v1:MITx+3.15.2x+2T2017+type@problem+block@42c91359d7294140bdfd231f6d5ca586-problem-progress" tabindex="-1">
problem
</h3>
<div class="problem-progress" id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@42c91359d7294140bdfd231f6d5ca586-problem-progress"></div>
<div class="problem">
<div>
<b>Part B</b>
<p>To deliver the light, we use an optical fiber. If the fiber is at most \(2m\) long, and we want \(99\%\) of the power to be transmitted, what is the maximum attenuation \(\alpha\) that the fiber could have?</p>
<p>\(\alpha\) (in \(dB/m\)):</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div id="formulaequationinput_42c91359d7294140bdfd231f6d5ca586_2_1" class="inputtype formulaequationinput">
<div class="unanswered">
<input type="text" name="input_42c91359d7294140bdfd231f6d5ca586_2_1" id="input_42c91359d7294140bdfd231f6d5ca586_2_1" data-input-id="42c91359d7294140bdfd231f6d5ca586_2_1" value="" aria-describedby="status_42c91359d7294140bdfd231f6d5ca586_2_1" size="20"/>
<span class="trailing_text" id="trailing_text_42c91359d7294140bdfd231f6d5ca586_2_1"/>
<span class="status unanswered" id="status_42c91359d7294140bdfd231f6d5ca586_2_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
<p id="answer_42c91359d7294140bdfd231f6d5ca586_2_1" class="answer"/>
<div id="input_42c91359d7294140bdfd231f6d5ca586_2_1_preview" class="equation">
\(\)
<img src="/static/images/spinner.bc34f953403f.gif" class="loading" alt="Loading"/>
</div>
</div>
<div class="script_placeholder" data-src="/static/js/capa/src/formula_equation_preview.b1967ab28c31.js"/>
</div></div>
<p>Can this be achieved in a silica fiber?</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 2" role="group"><div class="choicegroup capa_inputtype" id="inputtype_42c91359d7294140bdfd231f6d5ca586_3_1">
<fieldset aria-describedby="status_42c91359d7294140bdfd231f6d5ca586_3_1">
<div class="field">
<input type="radio" name="input_42c91359d7294140bdfd231f6d5ca586_3_1" id="input_42c91359d7294140bdfd231f6d5ca586_3_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="42c91359d7294140bdfd231f6d5ca586_3_1-choice_0-label" for="input_42c91359d7294140bdfd231f6d5ca586_3_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_42c91359d7294140bdfd231f6d5ca586_3_1"> Yes, easily
</label>
</div>
<div class="field">
<input type="radio" name="input_42c91359d7294140bdfd231f6d5ca586_3_1" id="input_42c91359d7294140bdfd231f6d5ca586_3_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="42c91359d7294140bdfd231f6d5ca586_3_1-choice_1-label" for="input_42c91359d7294140bdfd231f6d5ca586_3_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_42c91359d7294140bdfd231f6d5ca586_3_1"> Yes, with very careful engineering
</label>
</div>
<div class="field">
<input type="radio" name="input_42c91359d7294140bdfd231f6d5ca586_3_1" id="input_42c91359d7294140bdfd231f6d5ca586_3_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="42c91359d7294140bdfd231f6d5ca586_3_1-choice_2-label" for="input_42c91359d7294140bdfd231f6d5ca586_3_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_42c91359d7294140bdfd231f6d5ca586_3_1"> No
</label>
</div>
<span id="answer_42c91359d7294140bdfd231f6d5ca586_3_1"/>
</fieldset>
<div class="indicator-container">
<span class="status unanswered" id="status_42c91359d7294140bdfd231f6d5ca586_3_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
</div>
</div></div>
<div class="solution-span">
<span id="solution_42c91359d7294140bdfd231f6d5ca586_solution_1"/>
</div></div>
<div class="action">
<input type="hidden" name="problem_id" value="problem" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_42c91359d7294140bdfd231f6d5ca586" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_42c91359d7294140bdfd231f6d5ca586">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
</div>
<div class="problem-action-buttons-wrapper">
</div>
</div>
<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="42c91359d7294140bdfd231f6d5ca586-problem-title">
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="42c91359d7294140bdfd231f6d5ca586-problem-title">None
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification general notification-show-answer
is-hidden"
tabindex="-1">
<span class="icon fa fa-info-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="42c91359d7294140bdfd231f6d5ca586-problem-title">Answers are displayed within the problem
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
</div>
"
data-graded="True">
<p class="loading-spinner">
<i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i>
<span class="sr">Loading…</span>
</p>
</div>
</div>
</div>
<div class="vert vert-3" data-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@69a6ce369afe4ed782aa5f5157b49795">
<div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-init="XBlockToXModuleShim" data-course-id="course-v1:MITx+3.15.2x+2T2017" data-request-token="bfd4f78aed6a11eeb91516ffd59041e1" data-graded="True" data-usage-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@69a6ce369afe4ed782aa5f5157b49795" data-block-type="problem" data-runtime-class="LmsRuntime" data-runtime-version="1" data-has-score="True">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Problem"}
</script>
<div id="problem_69a6ce369afe4ed782aa5f5157b49795" class="problems-wrapper" role="group"
aria-labelledby="69a6ce369afe4ed782aa5f5157b49795-problem-title"
data-problem-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@69a6ce369afe4ed782aa5f5157b49795" data-url="/courses/course-v1:MITx+3.15.2x+2T2017/xblock/block-v1:MITx+3.15.2x+2T2017+type@problem+block@69a6ce369afe4ed782aa5f5157b49795/handler/xmodule_handler"
data-problem-score="0"
data-problem-total-possible="1"
data-attempts-used="0"
data-content="
<h3 class="hd hd-3 problem-header" id="69a6ce369afe4ed782aa5f5157b49795-problem-title" aria-describedby="block-v1:MITx+3.15.2x+2T2017+type@problem+block@69a6ce369afe4ed782aa5f5157b49795-problem-progress" tabindex="-1">
problem
</h3>
<div class="problem-progress" id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@69a6ce369afe4ed782aa5f5157b49795-problem-progress"></div>
<div class="problem">
<div>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><p>Is dispersion a problem in this application?</p>
<div class="choicegroup capa_inputtype" id="inputtype_69a6ce369afe4ed782aa5f5157b49795_2_1">
<fieldset aria-describedby="status_69a6ce369afe4ed782aa5f5157b49795_2_1">
<div class="field">
<input type="radio" name="input_69a6ce369afe4ed782aa5f5157b49795_2_1" id="input_69a6ce369afe4ed782aa5f5157b49795_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="69a6ce369afe4ed782aa5f5157b49795_2_1-choice_0-label" for="input_69a6ce369afe4ed782aa5f5157b49795_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_69a6ce369afe4ed782aa5f5157b49795_2_1"> Yes
</label>
</div>
<div class="field">
<input type="radio" name="input_69a6ce369afe4ed782aa5f5157b49795_2_1" id="input_69a6ce369afe4ed782aa5f5157b49795_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="69a6ce369afe4ed782aa5f5157b49795_2_1-choice_1-label" for="input_69a6ce369afe4ed782aa5f5157b49795_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_69a6ce369afe4ed782aa5f5157b49795_2_1"> No
</label>
</div>
<span id="answer_69a6ce369afe4ed782aa5f5157b49795_2_1"/>
</fieldset>
<div class="indicator-container">
<span class="status unanswered" id="status_69a6ce369afe4ed782aa5f5157b49795_2_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
</div>
</div><div class="solution-span">
<span id="solution_69a6ce369afe4ed782aa5f5157b49795_solution_1"/>
</div></div>
</div>
<div class="action">
<input type="hidden" name="problem_id" value="problem" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_69a6ce369afe4ed782aa5f5157b49795" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_69a6ce369afe4ed782aa5f5157b49795">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
</div>
<div class="problem-action-buttons-wrapper">
</div>
</div>
<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="69a6ce369afe4ed782aa5f5157b49795-problem-title">
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="69a6ce369afe4ed782aa5f5157b49795-problem-title">None
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification general notification-show-answer
is-hidden"
tabindex="-1">
<span class="icon fa fa-info-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="69a6ce369afe4ed782aa5f5157b49795-problem-title">Answers are displayed within the problem
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
</div>
"
data-graded="True">
<p class="loading-spinner">
<i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i>
<span class="sr">Loading…</span>
</p>
</div>
</div>
</div>
</div>
</div>
<div class="xblock xblock-public_view xblock-public_view-vertical" data-init="VerticalStudentView" data-course-id="course-v1:MITx+3.15.2x+2T2017" data-request-token="bfd4f78aed6a11eeb91516ffd59041e1" data-graded="True" data-usage-id="block-v1:MITx+3.15.2x+2T2017+type@vertical+block@14741948f60946398cf8e543d27b23f2" data-block-type="vertical" data-runtime-class="LmsRuntime" data-runtime-version="1" data-has-score="False">
<h2 class="hd hd-2 unit-title">Problem 3.2</h2>
<div class="vert-mod">
<div class="vert vert-0" data-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@8588be2e1a1243d8bf60bf080421ca29">
<div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-init="XBlockToXModuleShim" data-course-id="course-v1:MITx+3.15.2x+2T2017" data-request-token="bfd4f78aed6a11eeb91516ffd59041e1" data-graded="True" data-usage-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@8588be2e1a1243d8bf60bf080421ca29" data-block-type="problem" data-runtime-class="LmsRuntime" data-runtime-version="1" data-has-score="True">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Problem"}
</script>
<div id="problem_8588be2e1a1243d8bf60bf080421ca29" class="problems-wrapper" role="group"
aria-labelledby="8588be2e1a1243d8bf60bf080421ca29-problem-title"
data-problem-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@8588be2e1a1243d8bf60bf080421ca29" data-url="/courses/course-v1:MITx+3.15.2x+2T2017/xblock/block-v1:MITx+3.15.2x+2T2017+type@problem+block@8588be2e1a1243d8bf60bf080421ca29/handler/xmodule_handler"
data-problem-score="0"
data-problem-total-possible="4"
data-attempts-used="0"
data-content="
<h3 class="hd hd-3 problem-header" id="8588be2e1a1243d8bf60bf080421ca29-problem-title" aria-describedby="block-v1:MITx+3.15.2x+2T2017+type@problem+block@8588be2e1a1243d8bf60bf080421ca29-problem-progress" tabindex="-1">
Problem 3.2
</h3>
<div class="problem-progress" id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@8588be2e1a1243d8bf60bf080421ca29-problem-progress"></div>
<div class="problem">
<div>
<p>The dispersion coefficient of silica is given below, adapted from Saleh and Teich:</p>
<img width="500" src="/assets/courseware/v1/383063ba947a81aec55b498c5c05abca/asset-v1:MITx+3.15.2x+2T2017+type@asset+block/Graph1_3.23Adjusted.jpg"/>
<p>If we send data down a \(100 \, km\) long fiber at \(1550 \, nm\), estimate the maximum data rate that could be transmitted in the following cases:</p>
<p>A LED light source with spectral width of \(50 \, nm\) (\(1550 \, nm\) light)</p>
<p>Maximum Data Rate (\(MHz\)):</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div id="formulaequationinput_8588be2e1a1243d8bf60bf080421ca29_2_1" class="inputtype formulaequationinput">
<div class="unanswered">
<input type="text" name="input_8588be2e1a1243d8bf60bf080421ca29_2_1" id="input_8588be2e1a1243d8bf60bf080421ca29_2_1" data-input-id="8588be2e1a1243d8bf60bf080421ca29_2_1" value="" aria-describedby="status_8588be2e1a1243d8bf60bf080421ca29_2_1" size="20"/>
<span class="trailing_text" id="trailing_text_8588be2e1a1243d8bf60bf080421ca29_2_1"/>
<span class="status unanswered" id="status_8588be2e1a1243d8bf60bf080421ca29_2_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
<p id="answer_8588be2e1a1243d8bf60bf080421ca29_2_1" class="answer"/>
<div id="input_8588be2e1a1243d8bf60bf080421ca29_2_1_preview" class="equation">
\(\)
<img src="/static/images/spinner.bc34f953403f.gif" class="loading" alt="Loading"/>
</div>
</div>
<div class="script_placeholder" data-src="/static/js/capa/src/formula_equation_preview.b1967ab28c31.js"/>
</div></div>
<p>A laser light source with a spectral width of \(2 \, nm\) (\(1550 \, nm\) light)</p>
<p>Maximum Data Rate (\(MHz\)):</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 2" role="group"><div id="formulaequationinput_8588be2e1a1243d8bf60bf080421ca29_3_1" class="inputtype formulaequationinput">
<div class="unanswered">
<input type="text" name="input_8588be2e1a1243d8bf60bf080421ca29_3_1" id="input_8588be2e1a1243d8bf60bf080421ca29_3_1" data-input-id="8588be2e1a1243d8bf60bf080421ca29_3_1" value="" aria-describedby="status_8588be2e1a1243d8bf60bf080421ca29_3_1" size="20"/>
<span class="trailing_text" id="trailing_text_8588be2e1a1243d8bf60bf080421ca29_3_1"/>
<span class="status unanswered" id="status_8588be2e1a1243d8bf60bf080421ca29_3_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
<p id="answer_8588be2e1a1243d8bf60bf080421ca29_3_1" class="answer"/>
<div id="input_8588be2e1a1243d8bf60bf080421ca29_3_1_preview" class="equation">
\(\)
<img src="/static/images/spinner.bc34f953403f.gif" class="loading" alt="Loading"/>
</div>
</div>
<div class="script_placeholder" data-src="/static/js/capa/src/formula_equation_preview.b1967ab28c31.js"/>
</div></div>
<p>How do your answers change if you use \(800 \, nm\) light instead?</p>
<p>A LED light source with spectral width of \(50 \, nm\) (\(800 \, nm\) light)</p>
<p>Maximum Data Rate (\(MHz\)):</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 3" role="group"><div id="formulaequationinput_8588be2e1a1243d8bf60bf080421ca29_4_1" class="inputtype formulaequationinput">
<div class="unanswered">
<input type="text" name="input_8588be2e1a1243d8bf60bf080421ca29_4_1" id="input_8588be2e1a1243d8bf60bf080421ca29_4_1" data-input-id="8588be2e1a1243d8bf60bf080421ca29_4_1" value="" aria-describedby="status_8588be2e1a1243d8bf60bf080421ca29_4_1" size="20"/>
<span class="trailing_text" id="trailing_text_8588be2e1a1243d8bf60bf080421ca29_4_1"/>
<span class="status unanswered" id="status_8588be2e1a1243d8bf60bf080421ca29_4_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
<p id="answer_8588be2e1a1243d8bf60bf080421ca29_4_1" class="answer"/>
<div id="input_8588be2e1a1243d8bf60bf080421ca29_4_1_preview" class="equation">
\(\)
<img src="/static/images/spinner.bc34f953403f.gif" class="loading" alt="Loading"/>
</div>
</div>
<div class="script_placeholder" data-src="/static/js/capa/src/formula_equation_preview.b1967ab28c31.js"/>
</div></div>
<p>A laser light source with a spectral width of \(2 \, nm\) (\(800 \, nm\) light)</p>
<p>Maximum Data Rate (\(MHz\)):</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 4" role="group"><div id="formulaequationinput_8588be2e1a1243d8bf60bf080421ca29_5_1" class="inputtype formulaequationinput">
<div class="unanswered">
<input type="text" name="input_8588be2e1a1243d8bf60bf080421ca29_5_1" id="input_8588be2e1a1243d8bf60bf080421ca29_5_1" data-input-id="8588be2e1a1243d8bf60bf080421ca29_5_1" value="" aria-describedby="status_8588be2e1a1243d8bf60bf080421ca29_5_1" size="20"/>
<span class="trailing_text" id="trailing_text_8588be2e1a1243d8bf60bf080421ca29_5_1"/>
<span class="status unanswered" id="status_8588be2e1a1243d8bf60bf080421ca29_5_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
<p id="answer_8588be2e1a1243d8bf60bf080421ca29_5_1" class="answer"/>
<div id="input_8588be2e1a1243d8bf60bf080421ca29_5_1_preview" class="equation">
\(\)
<img src="/static/images/spinner.bc34f953403f.gif" class="loading" alt="Loading"/>
</div>
</div>
<div class="script_placeholder" data-src="/static/js/capa/src/formula_equation_preview.b1967ab28c31.js"/>
</div></div>
<div class="solution-span">
<span id="solution_8588be2e1a1243d8bf60bf080421ca29_solution_1"/>
</div></div>
<div class="action">
<input type="hidden" name="problem_id" value="Problem 3.2" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_8588be2e1a1243d8bf60bf080421ca29" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_8588be2e1a1243d8bf60bf080421ca29">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
</div>
<div class="problem-action-buttons-wrapper">
</div>
</div>
<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="8588be2e1a1243d8bf60bf080421ca29-problem-title">
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="8588be2e1a1243d8bf60bf080421ca29-problem-title">None
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification general notification-show-answer
is-hidden"
tabindex="-1">
<span class="icon fa fa-info-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="8588be2e1a1243d8bf60bf080421ca29-problem-title">Answers are displayed within the problem
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
</div>
"
data-graded="True">
<p class="loading-spinner">
<i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i>
<span class="sr">Loading…</span>
</p>
</div>
</div>
</div>
<div class="vert vert-1" data-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@af007e93e778483a86712749445e5871">
<div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-init="XBlockToXModuleShim" data-course-id="course-v1:MITx+3.15.2x+2T2017" data-request-token="bfd4f78aed6a11eeb91516ffd59041e1" data-graded="True" data-usage-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@af007e93e778483a86712749445e5871" data-block-type="problem" data-runtime-class="LmsRuntime" data-runtime-version="1" data-has-score="True">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Problem"}
</script>
<div id="problem_af007e93e778483a86712749445e5871" class="problems-wrapper" role="group"
aria-labelledby="af007e93e778483a86712749445e5871-problem-title"
data-problem-id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@af007e93e778483a86712749445e5871" data-url="/courses/course-v1:MITx+3.15.2x+2T2017/xblock/block-v1:MITx+3.15.2x+2T2017+type@problem+block@af007e93e778483a86712749445e5871/handler/xmodule_handler"
data-problem-score="0"
data-problem-total-possible="2"
data-attempts-used="0"
data-content="
<h3 class="hd hd-3 problem-header" id="af007e93e778483a86712749445e5871-problem-title" aria-describedby="block-v1:MITx+3.15.2x+2T2017+type@problem+block@af007e93e778483a86712749445e5871-problem-progress" tabindex="-1">
problem
</h3>
<div class="problem-progress" id="block-v1:MITx+3.15.2x+2T2017+type@problem+block@af007e93e778483a86712749445e5871-problem-progress"></div>
<div class="problem">
<div>
<p>What percentage of the power would be lost when transmitting through a \(100 \, km\) long fiber operating at \(1550 \, nm\)? The attenuation coefficient of silica at \(1550 \, nm\) is \(0.15 \, dB/km\).</p>
<p>Percentage:</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div id="formulaequationinput_af007e93e778483a86712749445e5871_2_1" class="inputtype formulaequationinput">
<div class="unanswered">
<input type="text" name="input_af007e93e778483a86712749445e5871_2_1" id="input_af007e93e778483a86712749445e5871_2_1" data-input-id="af007e93e778483a86712749445e5871_2_1" value="" aria-describedby="status_af007e93e778483a86712749445e5871_2_1" size="20"/>
<span class="trailing_text" id="trailing_text_af007e93e778483a86712749445e5871_2_1"/>
<span class="status unanswered" id="status_af007e93e778483a86712749445e5871_2_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
<p id="answer_af007e93e778483a86712749445e5871_2_1" class="answer"/>
<div id="input_af007e93e778483a86712749445e5871_2_1_preview" class="equation">
\(\)
<img src="/static/images/spinner.bc34f953403f.gif" class="loading" alt="Loading"/>
</div>
</div>
<div class="script_placeholder" data-src="/static/js/capa/src/formula_equation_preview.b1967ab28c31.js"/>
</div></div>
<p>What percentage of the power would be lost when transmitting through a \(100 \, km\) long fiber operating at \(800 \, nm\)? The attenuation coefficient of silica at \(800 \, nm\) is \(3 \, dB/km\).</p>
<p>Percentage:</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 2" role="group"><div id="formulaequationinput_af007e93e778483a86712749445e5871_3_1" class="inputtype formulaequationinput">
<div class="unanswered">
<input type="text" name="input_af007e93e778483a86712749445e5871_3_1" id="input_af007e93e778483a86712749445e5871_3_1" data-input-id="af007e93e778483a86712749445e5871_3_1" value="" aria-describedby="status_af007e93e778483a86712749445e5871_3_1" size="20"/>
<span class="trailing_text" id="trailing_text_af007e93e778483a86712749445e5871_3_1"/>
<span class="status unanswered" id="status_af007e93e778483a86712749445e5871_3_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
<p id="answer_af007e93e778483a86712749445e5871_3_1" class="answer"/>
<div id="input_af007e93e778483a86712749445e5871_3_1_preview" class="equation">
\(\)
<img src="/static/images/spinner.bc34f953403f.gif" class="loading" alt="Loading"/>
</div>
</div>
<div class="script_placeholder" data-src="/static/js/capa/src/formula_equation_preview.b1967ab28c31.js"/>
</div></div>
<div class="solution-span">
<span id="solution_af007e93e778483a86712749445e5871_solution_1"/>
</div></div>
<div class="action">
<input type="hidden" name="problem_id" value="problem" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_af007e93e778483a86712749445e5871" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_af007e93e778483a86712749445e5871">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
</div>
<div class="problem-action-buttons-wrapper">
</div>
</div>
<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="af007e93e778483a86712749445e5871-problem-title">
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="af007e93e778483a86712749445e5871-problem-title">None
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification general notification-show-answer
is-hidden"
tabindex="-1">
<span class="icon fa fa-info-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="af007e93e778483a86712749445e5871-problem-title">Answers are displayed within the problem
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
</div>
"
data-graded="True">
<p class="loading-spinner">
<i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i>
<span class="sr">Loading…</span>
</p>
</div>
</div>
</div>
</div>
</div>
© All Rights Reserved