ECE · all questions

Optical Communication
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Q161

. . . . . . . . is used to describe the light gathering or light collecting ability of an optical fiber

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Q162

A step index fibre has core diameter 40 µm with core refractive indix of 1.3 and numerical aperture 0.5, then the refractive index of cladding is

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Q163

Refractive index of glass is 1.5. What is the wavelength of a beam of light with a frequency of 10¹⁴ Hz in glass? Assume velocity of light in vacuum to be 3 × 10⁸ m/sec.

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Q164

The concept used in the scheme of WDM is similar to

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Q165

Which of the following introduces mode partition noise?

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Q166

The working of an optical fiber is bases on

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Q167

If a fiber operates at 1400 nm with the diameter of about 10 µm, n₁ = 1.30, ∆ = 0.80%, V = 3.5, then how many modes will it have?

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Q168

Fibers have numerical aperture (NA) in the region of 0.15 to 0.4. Fibers with higher N.A. values generally exhibit

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Q169

The fiber splice is a . . . . . . . . joint between 2 fibers.

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Q170

At critical radius of curvature, in multimode fibers

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Q171

An optical fiber communication system works on a wavelength of 1.3 µm. The number of subscribers it can feed, if a channel requires 20 kHz, is

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Q172

Approximately what is the frequency limit of an optical fiber?

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Q173

Which one of the following specifications does not fit for a single-mode fiber?

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Q174

On which bands, do the optical fibers operate?
1. Ultra violet band
2. Ultra high frequency band
3. Visible light band
4. Infrared band
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Q175

Numerical aperture is closely related to acceptance angle and is the figure of merit commonly used to measure

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Q176

The Bragg's Law of X-ray diffraction is:

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Q177

For a 3-µm-diameter optical fiber with core and cladding indexes of refraction of 1.545 and 1.510, respectively. The cut off wavelength is.

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Q178

Sensitivity of optical receivers is measured in

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Q179

If a light travels in a certain medium and it gets reflected off an optically denser medium with high refractive index, then it is regarded as . . . . . . . .

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Q180

In a optical fiber, the refractive index of the cladding material should be

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