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3dB optical bandwidth is always ___________ the 3dB electrical bandwidth.

A

Smaller than

B

Larger than

C

Negligible than

D

Equal to

Correct Answer: Larger than

Optical bandwidth is half of the maximum data rate. For non-return:0 (NRZ), bandwidth is same as bit rate. The bandwidth B for metallic conductors is defined by electrical 3dB points. Optical communication uses electrical circuitry where signal power has dropped to half its value due to modulated portion of modulated signal.

3dB optical bandwidth is always . . . . . . . the 3dB electrical bandwidth.

A

Smaller than

B

Larger than

C

Negligible than

D

Equal to

The 3 dB electrical bandwidth B is 42 MHz. Determine 3dB optical bandwidth Bopt.

A

45.18

B

59.39

C

78.17

D

94.14

A single-mode optical fiber has an attenuation of 0.3dB/km when operating at wavelength of 1.1μm. The fiber core diameter is 4μm and bandwidth is 500 MHz. Find threshold optical power for stimulated Brillouin scattering.

A

11.20 mw

B

12.77 mw

C

13.08 mw

D

12.12 mw

cascading two identical amplifier stages, each having a low-pass STC frequency response with a 3dB frequency f1, results in an overall amplifier with a 3dB frequency given by

A

√(√2+1) f1

B

√(√3-1) f1

C

√(√2-1) f1

D

√(√3+1) f1

In pulse dispersion measurements, the 3dB pulse broadening for the fiber is 10.5 ns/km and the length of the fiber is 1.2 km. Calculate the optical bandwidth for the fiber.

A

32 MHz km

B

45 MHz km

C

41.9 MHz km

D

10 MHz km

The optical bandwidth is _____________ the electrical bandwidth.

A

Smaller

B

Greater

C

Same as

D

Zero with respect to

Determine the 3 dB electrical bandwidth at 3 dB optical bandwidth Bopt of 56.2 MHz.

A

50.14

B

28.1

C

47.6

D

61.96

A planar LED is fabricated from GaAs is having a optical power emitted is 0.018% of optical power generated internally which is 0.018% of optical power generated internally which is 0.6 P. Determine external power efficiency.

A

0.18%

B

0.32%

C

0.65%

D

0.9%

Consider the following statements.
1. Fibre optics is based on the principle of total internal reflection.
2. In an optical fibre communication system, power consumption is extremely low
3. Optical fibre communications are free from radio frequency interference.
4. In India, Reliance Group of Industries is engaged in the manufacture of the optical fibre.
Which of these statements are correct?

A

Only 1, 2 and 3

B

Only 1, 2 and 4

C

Only 1, 3 and 4

D

Only 2, 3 and 4

In optical fiber communication, the electrical signal dropping to half its constant value due to modulated portion of optical signal corresponds to _______

A

6 dB

B

3 dB

C

4 dB

D

5 dB