The Role of Optical Amplifiers in Soliton Communication System: A Review

The soliton is an innovative area of research that deserves intense investigation in many branches of physics.
Different class of soliton-bearing models has been proposed in many physical problems in various context of
physical system and still continues to flourish as an area of intense research, but unfortunately when soliton
pulses are used for long-haul applications, they shed their energy on their way and hence needs to be amplified
periodically. Different optical amplifiers are used in the soliton model to amplify the soliton pulses so that they
can propagate at the same shape.
An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to
an electrical signal. There are several different physical mechanisms that can be used to amplify a light signal,
which correspond to the major types of optical amplifiers. In doped fiber amplifiers and bulk lasers, stimulated
emission in the amplifier's gain medium causes amplification of incoming light. In semiconductor optical
amplifiers (SOAs), electron-hole recombination occurs