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  • Exam Name: Nokia Advanced Optical Network Design
  • Last Update: 21-Mar-2025
  • Questions and Answers: 40
  • Single Choice: 40 Q&A's

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4A0-255 Questions and Answers

Question # 1

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

A.

FWM is a linear impairment that produces crosstalk four adjacent wavelengths are used.

B.

FWM is a non-linear impairment that produces crosstalk at the sum and difference of two wavelengths.

C.

FWM is a non-linear impairment resulting from varying velocities at different frequencies.

D.

FWM is a linear impairment resulting from pulses broadening over ultra-longdistances

Question # 2

Which of the following is NOTan advantage of super-channels?

A.

Improved spectral efficiency

B.

Simplified management of the carriers

C.

Narrower spacing between carries of the super-channel

D.

Impairment-free transmission

Question # 3

What isguardband required for?

A.

To reduce the impact of chromatic dispersion.

B.

To properly use the available bandwidth of the fibers.

C.

To enable each channel to support a higher modulation format.

D.

To reduce non-linear impairments between coherent and non-coherent channels.

Question # 4

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

A.

BER is the ratio of redundant bits to correct bits.

B.

BER is measured at both the transmitted and receiving ends.

C.

BER can be measured beforeafter the FEC decoding.

D.

BER can be accurately measured in a short period of time , for any rate.

Question # 5

Suppose there is a 40 Gbit/s signal which has a symbol rate of Gbaud/s. Which modulation format is being used?

A.

QPSK

B.

BPSK

C.

4QAM

D.

DP-QPSK

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