﻿<?xml version="1.0" encoding="UTF-8"?>
<quiz>
<question type="category">
<category>
<text>$course$/Optical systems and networks/Optical systems and networks</text>
</category>
</question>
<question type="multichoice">
<name>
<text><![CDATA[Maximum attenuation range of a Gigabit PON is:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Maximum attenuation range of a Gigabit PON is:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[3 dB]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[13 dB]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[32 dB]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[130 dB]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[The physical reach of a PON is typically:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[The physical reach of a PON is typically:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[200 km]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[>1000 km]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[20 km]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[few meters]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Gigabit PON by ITU-T (2010) can offer the following bit rates for the downstream / upstream:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Gigabit PON by ITU-T (2010) can offer the following bit rates for the downstream / upstream:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[1 Gbps symmetric]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[10 Gbps / 2.5 Gbps asymmetric]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[10 Gbps symmetric]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[10 Gbps / 1.25 Gbps asymmetric]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[DWDM allows for:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[DWDM allows for:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[channel spacing at least 20 nm]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[channel spacing 0.8 nm and even less]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[the use of Fabry-Perot lasers]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[the use of LED]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[CWDM allows for:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[CWDM allows for:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="100">
<text><![CDATA[channel spacing 20 nm or more]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[channel spacing 0.8 nm and even less]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[the reach of about 1000 km]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[fibre capacity up to 1 Tbps]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[FTTH is:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[FTTH is:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[an active optical network without any passive network components]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[access network, where fibres are terminated at the end user's home]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[an access network, where fibres are combined with metallic infrastructure]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[an access network, where fibres are combined with Wi-Fi connection]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Basic transport module in Optical Transport Hierarchy (OTM -0.1, without multiplexing) can transmit:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Basic transport module in Optical Transport Hierarchy (OTM -0.1, without multiplexing) can transmit:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="100">
<text><![CDATA[STM-16 at 2.5 Gbps]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[STM-16 at 10 Gbps]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[STM-64 at 2.5 Gbps]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[STM-64 at 40 Gbps]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Optical splices:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Optical splices:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[have greater attenuation than optical connectors]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[exhibit no back reflections, which affect connectors]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[typically, have attenuation of about 1-2 dB]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[cannot be detected by optical reflectometers]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[OTDR:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[OTDR:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[uses the mechanism of Stimulated Raman Scattering]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[uses the mechanism of Rayleigh back-scattered light]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[requires access to both ends of a fibre]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[can measure at the distance of 1000 km (undersea connections)]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[OTDR]]></text>
</name>
<questiontext format="html">
<text><![CDATA[OTDR]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[displays optical splices as peaks (local maximum of intensity)]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[displays optical connectors as peaks]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[cannot display splices because of no back reflections]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[cannot display connectors because of large back reflections]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[The typical range of EDFA's gain is:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[The typical range of EDFA's gain is:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[5 to 10 dB]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[30 to 50 dBm]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[20 to 50 dB]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[10 to 15 dBm]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Booster is an optical amplifier, which is located:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Booster is an optical amplifier, which is located:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="100">
<text><![CDATA[at the beginning of the network close to the source of optical radiation]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[at the termination of the network, right before the receiver of optical radiation]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[in the middle of the network, together with dispersion compensator]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[at the end of the network, but its pump is located in the middle of the network]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[EDFA's principle of operation is associated with]]></text>
</name>
<questiontext format="html">
<text><![CDATA[EDFA's principle of operation is associated with]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[Stimulated Raman Scattering]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[back scattering]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[stimulated emission of radiation]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[spontaneous emission of radiation]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Raman amplifier can generate radiation at the wavelength that is:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Raman amplifier can generate radiation at the wavelength that is:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[identical to the wavelength of the pump module]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[dependant on the length of the fibre]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[shifted by about 100 nm towards longer wavelengths]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[shifted by about 100 nm towards shorter wavelengths]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Raman amplifier can operate as:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Raman amplifier can operate as:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[RLA]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[RDA]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[NRD]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[DRA]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[One of the disadvantages of doped fibre amplifiers is:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[One of the disadvantages of doped fibre amplifiers is:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[low gain]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[narrow spectrum of emitted wavelengths]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[significant ASE noise]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[flat gain]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[EDFA's pump can operate at the wavelength of:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[EDFA's pump can operate at the wavelength of:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[630 nm]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[980 nm]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[630 nm]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[1550 nm]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Chromatic dispersion:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Chromatic dispersion:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[is expressed in [ps/km]]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[is composed of material and modal dispersion]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[is composed of material and polarization mode dispersion]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[means that each frequency component propagates at different speed]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Modal dispersion]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Modal dispersion]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[means that each frequency propagates along different optical path (trajectory)]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[means that each frequency component propagates at different speed]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[means that each mode propagates along different optical path (trajectory)]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[is always a negative value]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Dispersion Compensating Fibres:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Dispersion Compensating Fibres:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="100">
<text><![CDATA[can be designed as Photonic Crystal Fibres]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[exhibits positive values of dispersion parameter]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[can have dispersion of even 1000 ps/ns/km]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[can compensate positive material dispersion by negative modal dispersion]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[PMD refers to:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[PMD refers to:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="100">
<text><![CDATA[different speed for both axes of a fibre]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[interference of selected polarizations]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[different values of refractive index at different fibre lengths]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[each wavelengths propagating at different speed]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Running DWDM system over CWDM system:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Running DWDM system over CWDM system:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="100">
<text><![CDATA[has as its goal to increase the information capacity and the transmission rate]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[is required because CWDM technology is no longer supported]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[requires different modulation format for CWDM and DWDM]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[is impossible because of Four Wave Mixing]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>


</quiz>

