Optical fiber communication greatly develops considering the limitations of communication systemscorresponding to the demand of information needs. Optical fiber is one of waveguides that is able to transmit information with large capacity, high speed and low attenuation. Due to the very long distance, then the signal transmission needs to be maintained from the disturbance of geometry, materials and signal sources. To maintain the signal, optical amplifier is required although several amplifiers still have problems. This paper investigates the performance of Semiconductor Optical Amplifier (SOA) and Fiber Raman Amplifier (FRA). Using the simulation application, both amplifiers are designed and compared by inline amplifiers. The results showed that the transmission distance of FRA is more stable than SOA. However, this FRA system has higher power consumption when compared to the SOA system.

The continuing growth of telecommunication networks is currently dominated by fiber optics (or optical networking). Optical fiber has become the guided medium of choice in telecommunications, and associated optoelectronic technologies have become important such as optical fiber itself and optical amplifiers. Optical amplifiers can operate in the long distance using fiber optic carrying data and information in communication links. Some mechanisms are able to amplify electromagnetic signal corresponding to kinds of optical amplifiers. In doped fiber amplifiers and bulk laser sources, a stimulated emission in the amplifier's gain media causes amplification of incoming electromagnetic spectrum. In semiconductor optical amplifier (SOA), electron-hole interaction will occur. For Raman amplifier (RA), its scattering of incoming source with phonons in the lattice of the gain media will produce photons coherent with the incoming photons. Using the simulation, both amplifiers are simulated and compared by in-line amplifiers to allow and keep a better signal from material and geometry disturbance.

The discovery of optical fiber cause widespread revolution of communication system. Optical fiber communication has excellency on data transmission speed, security, flexibility, and broadly bandwidth. The applying of WDM network can broaden the bandwidth so that the transmission performance becomes more splendid. Although some factors such as dispersion, attenuation, and scattering can hinder the performance of fiber optic on sending data. Moreover dispersion can wreck data and spread pulse as it travels alongs fiber so that causing interference. There is some methods  of dispersion compensation. In this paper, Fiber Raman Amplifier is used on WDM network to strengthen signal which is sent to detector. This research utilize simulation approachment  with various bandwidth and length fiber. The results show lowest BER value and highest Q-factor at bandwidth frequency of 30 GHz and fiber length of 20 km.

The use of fiber optic for telecommunication system has widely developed because of limitations on communication ranges and methods for information demands. In the application of optical fiber communications, signal strength is reduced due to attenuation, absorption and dispersion effects of source, structure, and geometry of fiber, even for single mode fiber, these problems still exist. In order to investigate these phenomena, this paper designs and operates a simple optical design consisting of wavelength division multiplexing (WDM) which is able to multiplex various wavelength sources to one fiber optic by using various source wavelengths. This mechanism allows a bidirectional communication with several or more fibers without any interference. The output will describe the bit error rate (BER) and Q-factor and using two samples of Semiconductor Optical Amplifier (SOA) and Fiber Raman Amplifier (FRA). The simulation evaluates these amplifiers by manipulating the frequency of bandwidth until 50 GHz, a low BER corresponding to large Q-factor is reached. The BER value for SOA device is 7.59 Â 10 −16 and 1.54 Â 10 −27 for SOA device respectively for a bandwidth of 50 GHz. These data depict that SOA is able to launch the wavelength to high performance than that of FRA device. Both optical amplifiers describe better performances in term of the value of BER and Q-factor having much smaller than 10 −12 and larger than that of 6 respectively for a distance of 120 km for SOA and 100 km for FRA.