SDE to AGM (LICE) Page 4 of 194 - Optical Fiber Communication
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Questions and Answers

What is the basic principle of operation of an optical fiber communication system?

  • Transmission of meridional rays
  • Transmission of electromagnetic waves (correct)
  • Transmission of chemical signals
  • Transmission of mechanical vibrations

    • Which technology provides an overview of SDH and NGSDH in the field of optical fiber communication?

  • DWDM Technology (correct)
  • Terrestrial Radio Links
  • FTTH Technology
  • FSO & Li-Fi Communication

    • What does CPAN stand for in the context of optical fiber communication?

  • Controlled Personal Area Network
  • Communications Protocol Access Node
  • Customer Premises Area Network (correct)
  • Centralized Passive Aggregation Network

    • In the realm of optical fiber communication, what does OTN stand for?

    <p>Optical Transport Network</p> Signup and view all the answers

    Which technology provides an overview of DWDM in the field of optical fiber communication?

    <p>CPAN and OTN Technology</p> Signup and view all the answers

    What is the purpose of a variable range marker in an OTDR display?

    <p>To display the length of the fiber being measured</p> Signup and view all the answers

    How many markers are usually provided in an OTDR display for measurement purposes?

    <p>Five</p> Signup and view all the answers

    What type of link is used to download OTDR data to a computer?

    <p>RS232 link</p> Signup and view all the answers

    Which technology does OTDR primarily relate to?

    <p>SDH technology</p> Signup and view all the answers

    What is the purpose of providing hard copies of information on an OTDR display?

    <p>For record-keeping or further documentation</p> Signup and view all the answers

    What is the main purpose of ITU-T G.653 Compliant Dispersion shifted fiber?

    <p>Minimize dispersion value at 1550nm</p> Signup and view all the answers

    Which type of fiber is known for extremely low attenuation at 1550nm, making it suitable for long span applications without repeaters?

    <p>ITU-T G.654 Compliant Fiber</p> Signup and view all the answers

    What is the specific characteristic of ITU-T G.655 Compliant Non-zero dispersion shifted fiber (NZDSF) that helps solve nonlinear effects?

    <p>Non-zero dispersion at 1550nm</p> Signup and view all the answers

    Why are ITU-T G.653 Compliant fibers known to generate more troubles despite their good purpose?

    <p>Zero dispersion at 1550nm</p> Signup and view all the answers

    Which ITU-T Compliant fiber type was specifically introduced in the mid-1990s for WDM applications?

    <p>ITU-T G.655 Compliant Fiber</p> Signup and view all the answers

    What is the significance of the choice of 'on' time or pulsewidth in an OTDR?

    <p>It influences the timing process in the display.</p> Signup and view all the answers

    What is the key advantage of optical fiber communication in terms of signal security?

    <p>100% signal security</p> Signup and view all the answers

    What role does the Directive Coupler play in an OTDR?

    <p>Reflecting light into the avalanche photodiode</p> Signup and view all the answers

    How are fiber optic cables superior to copper cables in terms of storage and handling?

    <p>Fiber optic cables are lighter, flexible, and easier to handle than copper cables</p> Signup and view all the answers

    Why is amplification necessary for the electrical signal from the APD in an OTDR?

    <p>Because the electrical signal is very weak</p> Signup and view all the answers

    What is the sequence of transmission in an optical fiber communication system?

    <p>Information is encoded into electrical signals, then converted into light signals</p> Signup and view all the answers

    In an OTDR, what type of display is used to show the returned signals?

    <p>CRT like an oscilloscope</p> Signup and view all the answers

    Why does repeater spacing increase along with operating speeds in optical fiber communication systems?

    <p>Due to the use of low loss fibers at high data rates</p> Signup and view all the answers

    How does the timer function in relation to an OTDR's operation?

    <p>Produces a voltage pulse to activate the laser</p> Signup and view all the answers

    What is the significance of the speed of light in optical fiber communication?

    <p>It dictates the velocity of electromagnetic energy in materials like glass</p> Signup and view all the answers

    What is the main purpose of the OTDR technique?

    <p>To localize faults in the optical network</p> Signup and view all the answers

    What leads to the backscatter effect in optical fibers?

    <p>Reflection due to changes in glass molecular density</p> Signup and view all the answers

    What components are essential in the structure of an OTDR?

    <p>Light source, optical receiver, and data processing unit</p> Signup and view all the answers

    How is the time delay between outgoing and incoming signals measured in an OTDR?

    <p>By synchronizing the light source with the optical receiver</p> Signup and view all the answers

    What is the relationship between incoming power and backscatter power in an OTDR?

    <p>Incoming power and backscatter power decrease together</p> Signup and view all the answers

    What has led to the increase in bandwidth requirement from 20Kbps to around 1Gbps in optical fibre transmission?

    <p>Convergence of client terminals with voice, video, text, web, and multimedia capabilities</p> Signup and view all the answers

    How has the use of optical fibre as a transmission media improved presentability of human interfaces?

    <p>By incorporating signals from sensory organs like touch, vision, mind</p> Signup and view all the answers

    Which technology is mentioned in the text that is causing multiplexing to migrate from TDM and FDM to packet-based statistical multiplexing?

    <p>OTN technology overview</p> Signup and view all the answers

    What factor is driving the convergence of access networks according to the text?

    <p>Development of IP &amp; MPLS technologies</p> Signup and view all the answers

    How are client terminals evolving based on the information provided?

    <p>Enhanced GUI-based web interface and improved multimedia processing capabilities</p> Signup and view all the answers

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