Title :
Optimization of DSF- and SOA-based phase conjugators by incorporating noise-suppressing fiber gratings
Author :
Set, Sze Y. ; Geiger, Harald ; Laming, Richard I. ; Cole, Martin J. ; Reekie, Laurence
Author_Institution :
Optoelectron. Res. Centre, Southampton Univ., UK
fDate :
10/1/1997 12:00:00 AM
Abstract :
We compare the performance of dispersion-shifted-fiber (DSF) and semiconductor-optical-amplifier (SOA) based laser phase conjugators for a 10-Gb/s nonreturn-to-zero system with respect to conversion efficiency, noise figure, and distortion. Fiber gratings are used for signal extraction and amplified spontaneous emission (ASE) suppression, allowing closer wavelength spacing and reducing the conjugation noise figure by up to 12 dB. Despite the higher SOA conversion efficiency, both conjugators give similar noise figures with ASE suppression. However, the DSF-based conjugator has the advantage of distortion tolerance at higher input power
Keywords :
diffraction gratings; laser beams; multiwave mixing; optical fibre dispersion; optical fibre filters; optical noise; optical phase conjugation; semiconductor lasers; superradiance; 10 Gbit/s; ASE; ASE suppression; DSF-based phase conjugator; SOA conversion efficiency; SOA-based phase conjugator; amplified spontaneous emission; conjugation noise figure; conversion efficiency; dispersion-shifted-fiber; distortion; distortion tolerance; fiber gratings; four wave mixing; input power; noise figure; noise-suppressing fiber gratings; nonreturn-to-zero system; optimization; semiconductor-optical-amplifier; signal extraction; wavelength spacing; Frequency conversion; Optical filters; Optical mixing; Optical noise; Optical pumping; Optical wavelength conversion; Phase noise; Semiconductor device noise; Semiconductor optical amplifiers; Stimulated emission;
Journal_Title :
Quantum Electronics, IEEE Journal of
