Abstract
The advantages of all optical signal processing for high bit rate systems are increasingly being recognised and have stimulated interest in the demonstration of all-optical switching and logic operations. In particular optical fibres have been used to demonstrate optical switching by nonlinear polarisation rotation{1−3}, in the Mach-Zehnder interferometer configuration{4} and through nonlinear coupling{5}. Optical fibres are preferred as they permit ultrafast switching (the intensity dependent index change, n2, originates from nonresonant electronic process), have low loss, and can be used to fabricate all fibre devices. Otsuka{6} has proposed a nonlinear antiresonant ring interferometer for realisation of several optical functional devices. An all optical fibre loop mirror is a guided wave version of this device and has the advantage that it requires no interferometric alignment. Doran et al{7} have theoretically investigated nonlinear properties of this device and in this paper we report first experimental demonstration of the nonlinear response of such a device.
© 1989 Optical Society of America
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