BRITISH TELECOM RESEARCH LABS IPSWICH (UNITED KINGDOM)
The nonlinear fibre loop mirror NOLM has been shown to be a versatile device for alloptical switching, ultrafast multiplexingdemultiplexing, logic applications, pulse shaping and passive mode-locking for fibre lasers. Initially, the NOLM devices were fabricated using polarisation-maintaining fibres due to concerns about polarisation stability. This can be particularly significant in self switching devices due to differential nonlinear polarisation rotation arising from the unequal powers in the counterpropagating signals. However, the use of polarisation-maintaining fibres is not attractive as coupler fabrication is difficult and a higher loss results when splicing to standard fibres. Recently, stable operation of a dual-wavelength NOLM ultrafast multiplexerdemultiplexer has been demonstrated using 6.4 km long standard telecommunication fibre. In this paper we present experimental results on nonlinear polarisation effects in a self-switching NOLM fabricated from a standard telecommunication fibre.
This article is from 'OSA Proceedings of the Topical Meeting on Nonlinear Guided-Wave Phenomena Held in 2-4 September 1991. Cambridge, England United Kingdom. Volume 15', AD-A253 471, p357-361.