Showing papers by "Mike J. O'Mahony published in 1993"
TL;DR: In this article, it was shown that it is possible to increase optical gain by more than 10 dB for optical signals around the wavelength of 1.55 mu m, compared with conventional EDFAs without filters.
Abstract: Erbium-doped fiber amplifiers (EDFAs) with enhanced optical gain obtained by incorporating narrow-bandpass optical filters into the amplifier length are studied. It is shown in theory that it is possible to increase optical gain by more than 10 dB for optical signals around the wavelength of 1.55 mu m, compared with conventional EDFAs without filters. It is also shown that the gain improvement at longer wavelengths away from the amplifier gain peak is much higher than that of the EDFA with an optical isolator within the amplifier length. The optimum filter position is found to be around 42% of the total amplifier length from the input end. The effects of filter insertion loss and pump loss are discussed. This amplifier can be used as an optical preamplifier in a receiver for a wide range of wavelengths. >
14 citations
27 Oct 1993
TL;DR: In this article, a narrow band-pass filter was inserted within the erbium-doped fiber amplifiers length to suppress the built-up of both forward and backward ASE powers.
Abstract: The authors have shown that significant optical gain improvements can be achieved by inserting a narrow band-pass filter within the erbium-doped fibre amplifiers length to suppress the built-up of both forward and backward ASE powers, accompanied by a noise figure reduction of 0.6-0.8 dB. The optimum filter position is found to be around 48% and 42% from the input end of the total amplifier length for 1.48 mu m and 0.98 mu m pump wavelengths respectively.
2 citations