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The work is to be 5 pages with three to five sources, with in-text citations and a reference page

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The work is to be 5 pages with three to five sources, with in-text citations and a reference page. The basic requirement for the light sources used in optical communication systems usually depends on the nature of the intended application. Both the light-emitting diodes (LEDs) and the laser diodes are normally used as sources in the fibre optic communication systems. The laser diodes are usually characteristic of high power requirement, high speed in signal transmission and narrow spectral width [2]. They, however, show a high degree of sensitivity to variations in temperatures. Light-emitting diodes normally have a surface-emitting and edge-emitting structures [8]. The surface-emitting diodes are characteristic of ruggedness on the surface, a high degree of reliability, lower cost of operation and simplicity in the design of the system [6].

The sensitivity of the receiver can be defined as the minimum power of the light that is received that is required in order to achieve a defined signal to noise ratio and this is subject to improvement by the use of photon numbers of the squeezed light [5]. The performance of the digital heterodyne receiver can therefore be determined using the amplitude and the phase modulations using the on-off key source.

The SFH750V transmitter can be said to be an LED device that emits about 650nm and it is capable of outputting about 20 UW of light. It has a spectral width of 35 nm and requires a current that is dependent on the required intensity of 10-45 mA. The transmitter is usually a four-pin device is it is composed of an LED, a glass bead and a chamber into which the optical fibre can be inserted.

SFH250V receiver is a photodiode receiver and it is designed to be much more sensitive at 850nm and normally detects a signal of about 650nm. When it is used to detect a signal, a photodiode must be used in reverse bias.