13 WDM Questions & Answers

[Mohamed.Saeed]

1. What are types of WSS?

   • Liquid crystal
   • Liquid crystal on silicon
   • Micro electro mechanical system

2. What are number of channels supported by WDM?

   • In CWDM , up to 18 channel
   • In DWDM more than 120 channel

3. What’s difference between booster and pre amplifier?

   • Booster used with Tx side
   • Pre amplifier used with Rx side

4. Which types of optical modules support high capacity?

   • CFP & CXP , CFP 4&CFP 8 as an example

5. What are main types of amplifiers in WDM?

   • EDFA
   • Raman

6. Which spectrum range used with DWDM?

   • C band
   • L band

7. What are functions of spectrum analyzer boards?

   • Measure OSNR
   • Measure central wavelength
   • Measure optical power in ports

8. What’s average range of Rx. sensitivity for OSC boards?

   • -40 / -48 dbm

9. What are commons types of dispersion?

   • Chromatic dispersion
   • Polarization mode dispersion

10. What are types of FOADM?

    • Serial FOADM
    • Parallel FOADM

11. In which scenario preferably to use ASON?

    • Mesh topology with multiple routes

12. What is common modulation types used with WDM?

    • DQPSK
    • ePDM Qpsk
    • 16 QAM

13. Which types of fiber standards preferd to be used with DWDM to avoid four wave mixing?

    • G652
    • G655

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