Enhancement of the Optical Transmission System Utilizing a Dual-Function Remotely Pumped Erbium-Doped Fiber Amplifier
Al-Kaissi, Ahmed Wathik Naji (2006) Enhancement of the Optical Transmission System Utilizing a Dual-Function Remotely Pumped Erbium-Doped Fiber Amplifier. PhD thesis, Universiti Putra Malaysia.
Optical fiber communication system is an active research area for its high demand especially in the long-haul communication system. A lot of work has been done to improve the optical transmission system (OTS) as a long-haul system using remotely-pumped Erbium-Doped Fiber Amplifier (R-EDFA) and Distributed Raman Amplification (DRA). Despite these achievements, there is still room for enhancements and developments to solve the existing system’s problems. This work presents a thorough research on OTS using hybrid R-EDFA and DRA approach. The research work includes gain enhancing technique under low pump power, enhanced dispersion compensating technique, new R-EDFA location-optimization technique, and a figure of merit is introduced to determine the optimal setting for R-EDFA with respect to its practical applications (Post- and Pre-amplifier). Various designs for low pump R-EDFA are proposed and investigated in this research work. A dual-function R-EDFA configuration, in which a Chirped Fiber Bragg Grating (CFBG) is placed inside the R-EDFA configuration, is demonstrated in this research work. This configuration offers two functions at the same time, where it can achieve both double-pass amplification technique as well as dispersion compensating technique. A practical comparative analysis is conducted to compare the performance of the newly developed configuration with the conventional R-EDFA configurations, this configuration is found to give better performance compared to the conventional amplifier configurations, where a gain of 23 dB is achieved for input signal power of less than -35 dBm at only 10 mW pump power. Since the location of R-EDFA has a high impact on the total transmission distance, a new technique is proposed to find the optimum location of R-EDFA, where a location close to the receiver is found to give a longer distance. In this research work, many configurations of OTS are developed and presented. A maximum transmission distance of 293 km is achieved using an optimized OTS which utilizes dual-function R-EDFA at 2.5 Gbps. A bit error rate (BER) is used as the main performance parameter with a threshold value of better than 10-10. In addition to that, a mathematical modeling for this optimized configuration is carried out in this research work, which deals with the post- and pre-length of the system as well as the R-EDFA and DRA. Finally, in order to evaluate further the performance of the optimized configuration with respect to the previous systems, a new performance parameter called Pump Power Consumption (PPC) is introduced. This optimized OTS configuration has a better PPC (0.682 mW/km) compared to the previous OTS.
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