Erbium doped fiber amplifiers (EDFA’s) have attracted much attention for use in the third telecommunication window at wavelengths in the 1540-1560nm band (H. Osanai et al., 1976). Although much progress has been made in the development of high gain EDFAs, which form the backbone of high-capacity optical communications, fiber systems still suffer from loss due to different intrinsic characteristics of fiber materials. Hence, increased research effort is directed towards new materials and detailed system optimization (J. L. Zyskind et al., 1989). Various configurations (C. Lester et al., 1995) have been proposed to increase amplifier gain and to reduce noise figures (NF), however to our knowledge there has been no report of results that go beyond a gain of 54dB.
In this paper, the proposed system achieves a gain of 62dBs. It employs a dual-stage (DS) to enhance the amplification and a tunable band-pass filter (TBF) to filter out the backward amplified spontaneous emission (ASE) that degrades the signal amplification at the input end of the EDFA. The experimental work will build up by using the active component Silica based EDF (Si-EDF) in Dual Stage Quadruple Pass (DSQP) configuration. By using Tunable Bandpass Filter (TBF) in DSQP between the port 1 and port 2 of circulators (CRT2, CRT3) to filter out the unwanted ASE.
