Comparison of DSF and SOA based phase conjugators employing noise-suppressing fibre grating

Geiger, H.
Set, S.Y.
Laming, R.I.
Cole, M.J.
Reekie, L.

Publication date

January 1997

DOI

10.1109/OFC.1997.719771

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Abstract

We compare the performance of dispersion-shifted-fibre (DSF) and semiconductor-optical-amplifier (SOA) based phase conjugators in a 10 Gb/s non-return-to-zero transmission system with respect to conversion efficiency, noise figure and distortion. Fibre 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