Multiple Choice Questions on Fiber Optic Communication

Solapur University M.Sc Semester – IV Exam Paper March/April 2019

In the intrinsic absorption process the energy of the incident photons be ________ to the bandgap energy Eg 04 the material used to fabricate the photo detector
(a) lesser than or equal
(b) grater than or equal
(c) equal
(d) not equal

The typical best bandwidth length products for multi mode graded index fiber is _________
(a) 20 MHz Km
(b) 100 GHz km
(c) 200 GHz km
(d) 1 GHz km

An optical fiber ___________ is a device that distributes light from a main fiber into one or more branch fibers.
(a) Attenuator
(b) Coupler
(c) Spilces
(d) Connector

The LED can operate at __________ than the injection laser.
(a) Higher current density
(b) Lower current density
(c) Higher Power
(d) None of these

Injection laser will generally supply _________of optical output power
(a) Milliwatt
(b) Kilowatt
(c) megawatt
(d) Microwatt

All plastic or polymeric fibers are exclusively of the __________type with large core & cladding diameter
(a) Single mode step index
(b) Multimode step index
(c) Multimode graded index
(d) None of these

A permanent joint formed between two individual optical fibers in the field or factory is known as
(a) Fiber joint
(b) Fiber splice
(c) Fiber coupler
(d) Fiber connectors

Numerical Aperture is useful measure of __________
(a) Light scattering ability
(b) Attenuation
(c) Dispersion
(d) Light gathering capability

The ray tracing helical path through fiber gives change in direction of 2 Gama at each reflection called ________
(a) Meridional ray
(b) Skew ray
(c) Axial ray
(d) None of these

For a NA of 0.3, a core RI of 1.4, the coupling efficiency into the fiber when the LED is in close proximity to the fiber core is __________
(a) 0.09
(b) 0.04
(c) 0.08
(d) 0.06

LED is ___________optical source.
(a) Coherent
(b) Non Coherent
(c) Both
(d) None of these