QUESTION: 13

Which of the following statements about the Decision (HDEFC) decoding and soft decision FEC (SDFEC) decoding is FALSE?

HDFEC injects less latency into the decoding process than SDFEC.
HDFEC provides a higher coding gain than SDEFC
HDFEC uses fewer thresholds than SDEF
HDFEC discards bits earlier in the decoding process than SDEFC.

Answer(s): A

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QUESTION: 14

Which of the following statements about Bit Error Rate (BER) is correct?

BER is the ratio of redundant bits to correct bits.
BER is measured at both the transmitted and receiving ends.
BER can be measured before after the FEC decoding.
BER can be accurately measured in a short period of time , for any rate.

Answer(s): B

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QUESTION: 15

Consider two EDFA amplifiers in cascade. Each EDFA has an average input signal power of 10 mW and an average noise power of 1 mW.
What is the OSNR of the system at the receiver.

20 dB
10 dB
7 dB
5 bB

Answer(s): A

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QUESTION: 16

Which of the following best describes Four Wave Mixing (FWM)?

FWM is a linear impairment that produces crosstalk four adjacent wavelengths are used.
FWM is a non-linear impairment that produces crosstalk at the sum and difference of two wavelengths.
FWM is a non-linear impairment resulting from varying velocities at different frequencies.
FWM is a linear impairment resulting from pulses broadening over ultra-long distances

Answer(s): A

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