Explore topic-wise MCQs in Optical Communications.

This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Optical Communications knowledge and support exam preparation. Choose a topic below to get started.

1.

An SOA has noise power spectral density of 1.18mW, spontaneous emission factor of 4, optical bandwidth of 1.5 THz. Determine mode number.

A. 1.53 10<sup>28</sup>
B. 6.14 10<sup>12</sup>
C. 1.78 10<sup>16</sup>
D. 4.12 10<sup>-3</sup>
Answer» B. 6.14 10<sup>12</sup>
2.

An SOA has mode number of 2.6, spontaneous emission factor of 4, optical bandwidth of 1 THz. Determine noise power spectral density.

A. 1.33 10<sup>-3</sup>
B. 5.13 10<sup>12</sup>
C. 3.29 10<sup>-6</sup>
D. 0.33 10<sup>-9</sup>
Answer» B. 5.13 10<sup>12</sup>
3.

An SOA has length of 35.43 10-3m, at 30 dB gain. Determine net gain coefficient.

A. 5.124 10<sup>-3</sup>
B. 1.12 10<sup>-4</sup>
C. 5.125 10<sup>-3</sup>
D. 2.15 10<sup>-5</sup>
Answer» D. 2.15 10<sup>-5</sup>
4.

An SOA has net gain coefficient of 300, at a gain of 30dB. Determine length of SOA.

A. 0.32 m
B. 0.023 m
C. 0.245 m
D. 0.563 m
Answer» C. 0.245 m
5.

Determine the peak gain wavelength of uncoated FPA having mode spacing of 2nm,and 250 mlong active region and R.I of 3.78.
a)2.25 10-4

A. 4.53 10<sup>-8</sup>
B. 1.94 10<sup>-6</sup>
C. 4.25 10<sup>9</sup>
Answer» D.
6.

An uncoated FPA has peak gain wavelength 1.8 m, mode spacing of 0.8nm, and long active region of 300 v. Determine RI of active medium.

A. 4.25 10<sup>6</sup>
B. 3.75 10<sup>7</sup>
C. 3.95 10<sup>7</sup>
D. 4.25 10<sup>9</sup>
Answer» C. 3.95 10<sup>7</sup>
7.

______________ are operated at current beyond normal lasing threshold current, practically.

A. Semiconductor optical amplifier
B. Erbium-doped fiber amplifier
C. Raman fiber amplifier
D. Brillouin fiber amplifier
Answer» B. Erbium-doped fiber amplifier
8.

Mostly ____________ are used in nonlinear applications.

A. Semiconductor optical amplifier
B. Erbium-doped fiber amplifier
C. Raman fiber amplifier
D. FPAs
Answer» E.
9.

For used in single-mode fiber __________ are used preferably.

A. Semiconductor optical amplifier
B. Erbium-doped fiber amplifier
C. Raman fiber amplifier
D. Brillouin fiber amplifier
Answer» B. Erbium-doped fiber amplifier
10.

________________ cannot be used for wideband amplification.

A. Semiconductor optical amplifier
B. Erbium-doped fiber amplifier
C. Raman fiber amplifier
D. Brillouin fiber amplifier
Answer» E.
11.

The more advantages optical amplifier is ____________

A. Fiber amplifier
B. Semiconductor amplifier
C. Repeaters
D. Mode hooping amplifier
Answer» C. Repeaters