Rajasthan Polytechnic Third Year Paper 2016 – Optical Fiber Communication

Rajasthan Polytechnic Third Year Paper 2016 – Optical Fiber Communication

What is the basic principle of LED?
(a) Spontaneous emission
(b) Stimulated emission
(c) Total internal reflection
(d) Total internal refraction

The loss in signal power as light travels down. This power loss is called
(a) Dispersion
(b) Attenuation
(c) Absorption
(d) Scattering

The range of wavelength emitted by light source is known as
(a) Bandwidth
(b) Chromatic dispersion
(c) Spectral width
(d) Beam width

What is the basic principle of light propagation in optical fiber?
(a) Spontaneous emission
(b) Stimulated emission
(c) Total internal reflection
(d) Total intrnal refraction

In optical fiber attenuation is minimum at the wavelength
(a) 1550 nm
(b) 1350 nm
(c) 1200 nm
(d) 800 nm

What is life time of LASER ?
(a) 100,000 min.
(b) 500,000 min.
(c) 100,000 hrs.
(d) 500,000 hrs.

PIN photodiodes used as fiber optic detectors waves under which condition?
(a) Forward bias
(b) Reverse bias
(c) Un-biased
(d) None of these

LED is made using material having energy band gap of 2.2 eV. What is the wavelength of light emitted by LED?
(a) 566 nm
(b) 800 nm
(c) 1200 nm
(d) 1350 nm

Which of the following source emits coherent light?
(a) LED
(b) LASER
(c) APD
(d) PIN

The inner portion of optical fiber is called
(a) Cladding
(b) Coating
(c) Core
(d) Inner Conductor