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Conference on Lasers and Electro-Optics

Use of bidirectional ring cavity for optically bistable devices

Govind Prasad Agrawal

Published Jan 1, 1981• 1 citation
Publisher

Abstract

In most of the optically bistable devices an external driving field excites a single-cavity mode of a nonlinear Fabry-Perot interferometer. In this paper it is shown that the use of a bidirectional ring cavity, in which two counterpropagating modes at the same frequency are excited, introduces re markable and useful qualitative features in the cavity transmission. Such a system appears to have potential for device applications.

DOI
10.1364/cleo.1981.thm18

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In most of the optically bistable devices an external driving field excites a single-cavity mode of a nonlinear Fabry-Perot interferometer. In this paper it is shown that the use of a bidirectional ring cavity, in which two counterpropagating modes at the same frequency are excited, introduces re markable and useful qualitative features in the cavity transmission. Such a system appears to have potential for device applications.
Two input beams at the same frequency excite the counter-propagating modes of a bidirectional ring cavity. These modes are coupled in the presence of a homogeneously broadened nonlinear medium and the optical device acts as two bistable switches whose characteristics can be mutually controlled. After a proper account of interference between the forward and backward waves, new features of optical bistability in a bidirectional ring cavity are discussed. It is found that when the intensity of one of the incident beams is held fixed in a critical range, the device switches on but never switches off as the intensity of the other beam is first increased and then decreased to zero.
Most of the intrinsic optical devices which have been studied in recent years consist of a Fabry-Perot resonator containing a nonlinear medium. The response time of such devices is determined by the transients associated with the high-Q resonator and the response time of the nonlinear medium. The fastest devices must be free of any Fabry-Perot cavity. The excitation of either surface plasmons at a nonlinear interface or guided waves in thin nonlinear films is a way to obtain an ultrafast bistable optical device. These two kinds of device have been studied.
We present numerical results relative to a bistable optical device comprised of an asymmetric Fabry-Perot cavity embedding a nonlinear optical medium. Both the real and imaginary part of the third order nonlinear susceptibility are considered in our calculations. Optimized device operation, expressed in terms of the contrast ratio between the two stable states, is then discussed as a function of the different cavity parameters. The presented method can be a useful tool for designing practical devices with application in the field of all-optical switching, optical regeneration and optical signal processing.
We present numerical results relative to a bistable optical device comprised of an asymmetric Fabry-Perot cavity embedding a nonlinear optical medium. Both the real and imaginary part of the third order nonlinear susceptibility are considered in our calculations. Optimized device operation, expressed in terms of the contrast ratio between the two stable states, is then discussed as a function of the different cavity parameters. The presented method can be a useful tool for designing practical devices with application in the field of all-optical switching, optical regeneration and optical signal processing.