Fiber optics and networks

In an optical fiber, the concept of Numerical aperture is applicable in describing the ability of __________

• a. Light Collection

• b. Light Scattering

• c. Light Dispersion

• d. Light Polarization

Which among the following is regarded as an inelastic scattering of a photon?

• a. Kerr Effect

• b. Raman Effect

• c. Hall Effect

• d. Miller Effect

Compared to the core, the index of refraction of the cladding must be:

• a. the same

• b. greater

• c. less

• d. doesn’t have an index of refraction

Single-mode fiber is made from:

• a. glass

• b. plastic

• c. both a and b

• d. none of the above

1. The absence of _______________ in LEDs limits the internal quantum efficiency.

• a) Proper semiconductor

• b) Adequate power supply

• c) Optical amplification through stimulated emission

• d) Optical amplification through spontaneous emission

If a particular optical power is coupled from an incoherent LED into a low-NA fiber, the device must exhibit very high radiance . State whether the given statement is true or false.

• a) True

• b) False

The amount of radiance in planer type of LED structures is

• a) Low

• b) High

• c) Zero

• d) Negligible

A measure of amount of optical fiber emitted from source that can be coupled into a fiber is termed as

• a) Radiance

• b) Angular power distribution

• c) Coupling efficiency

• d) Power-launching

The ratio r = (n1 – n)/ (n1 – n) indicates

• a) Fresnel reflection

• b) Reflection coefficient

• c) Refraction coefficient

• d) Angular power distribution coefficient

A permanent joint formed between two different optical fibers in the field is known as a

• a) Fiber splice

• b) Fiber connector

• c) Fiber attenuator

• d) Fiber dispersion