ECE · all questions

Optical Communication
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Q221

Single mode fibers allow single mode propagation; the cladding diameter must be at least

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Q222

Insertion of a record in a linked list involves the modification of

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Q223

Which one of the following is the ratio of power lost per unit length to the twice of power transmitted?

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Q224

Dispersion in an optical fibre used in a communication link is of which type?

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Q225

The cladding that surrounds the fibre core:

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Q226

Which optical detector is used when high sensitivity and bandwidth are required?

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Q227

Which among the following is provided by an optical receiver for the regeneration of data signal with minimum error?

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Q228

In an optical communication system, having an operating wavelength λ in meters, only X% of its source frequency can be used as its channel bandwidth. The systems is to be used for transmitting TV signal requiring a bandwidth of f Hz. The number of channels transmitted by this system simultaneously is (c = speed of light)

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Q229

The cut-off wavelength for an optical fibre with 5 µm core diameter and core cladding indices of refraction 1.84 and 1.402 is nearly

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Q230

Which one of the following statements is NOT true for a step index optical fibre?

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Q231

Velocity of light travelling in an optical fibre is

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Q232

In an optical fiber, dispersion:

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Q233

Multimode graded index fibers are manufactured from materials with

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Q234

Which one of the following is capable of giving the highest data speed?

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Q235

Maximum data rate of a channel for a noiseless 2-kHz binary channel is-

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Q236

A digital optical fiber communication system operating at a wavelength of 1 µm requires a maximum bit error rate of 10^-9. What is the theoretical quantum limit at the receiver in terms of the quantum efficiency of the detector and the energy of an incident photon?

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Q237

Match List-I with List-II and select the correct answer using the options given below:

List-I (Different Fibre Generation)	List-II (Optical Components Used)
a. First	1. Graded index multimode fibre and 1310 nm LD
b. Second	2. Graded index multimode fibre and 850 nm LD
c. Third	3. Step index monomode fibre and 1550 nm LD
d. Fourth	4. Step index monomode fibre and 1310 nm LD

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Q238

The cladding which surrounds the fibre core

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Q239

A certain optical fiber has refractive index of clad (n₁) = 1.40 and that of core (n₂) = 1.05. Its numerical aperture will be

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Q240

Losses in optical fibers can be caused by

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