FIBER OPTICS

A fiber-optic cable is composed of ………… concentric layers,

• ONE

• TWO

• THREE

• FOUR

The speed of light in plastic compared to the speed of light in air is

• SLOWER

• FASTER

• THE SAME

• Either lower or faster

Is a non-coherent light source for optical communications system. Or Which of the following is used as an optical transmitter on the Fiber Optical Communications?

• ILD

• LED

• APD

• PIN DIODE

Photodiodes used as fiber optic directors are

• Unbiased to generate a voltage same as a solar cell

• Reversed bias

• Forward bias

• Thermoelectrically cooled

Which of the following is not a common application of fiber-optic cable?

• Computer networks

• Long-distance telephone systems

• Closed circuit TV

• Consumer TV

 which of the following is described by the concept of numerical aperture in an optical fibre?

• Light scattering

• light collection

• light dispersion

• Light polarisation

A dielectric waveguide for the propagation of electromagnetic energy at

light frequencies

One of the following is not a characteristic of light detectors.

• Responsitivity

• Spectral response

• Transmit time

•  

  Dispersion

In single mode fibers, which is the most beneficial index profile?

• Step index

• Graded index

• Step and graded index

• Coaxial cable

Which type of fiber-optic cable is the best for very high speed data?

• Single-mode step-index

• Multimode step-index

• Single-mode graded-index

• Multimode graded-index