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International Conference on Optoelectronic Science and Engineering '90

Applications of electro-optical hybrid optical bistable devices

Chunfei Li

Published Dec 4, 2017• 1 citation
Publisher

Abstract

The hybrid optical bistable devices with electro-optical feedback have many potential important applications for controlling light by light or electricity, such as optical modulator, optical switch, optical logic, optical limiter, optical stabilizer, optical amplifer, optical oscillator and optical sensor. Some examples which have been done by us are shown in this paper.

DOI
10.1117/12.2294894

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The hybrid optical bistable devices with electro-optical feedback have many potential important applications for controlling light by light or electricity, such as optical modulator, optical switch, optical logic, optical limiter, optical stabilizer, optical amplifer, optical oscillator and optical sensor. Some examples which have been done by us are shown in this paper.
Bistable optical devices have been suggested for a number of applications (switching, optical memory, binary logic, discrimination, amplifications, clipping, limiting and pulse shaping) in optical signal processing and communication system. Recently, several integrated optical bistable devices have been made available. Most of them have performed by using LiNb03 as electrooptical waveguide modulator. A review of integrated bistable devices based on waveguide optical modulators is presented under this paper.
We present a review of optical bistability in active and passive optoelectronic devices, with particular reference to switching speeds and powers. The large resonant nonlinearities available near the bandgaps of semiconductors may be utilized to develop bistable devices operating at low powers and high speeds. Passive devices are driven by external optical sources and include nonlinear etalons, nonlinear interfaces, self-focusing configurations and electro-optic modulators with electrical feedback. Active devices include injection lasers and superluminescent amplifiers. Potential advantages of active devices include speed, gain, sensitivity and the ability to drive other devices, but complexity and high power dissipation may limit their use in applications requiring high density.
Abstract In the area of optical logic and optical information processing, such nonlinear optical devices as optical Instability, optical amplifier, and optical limiter are important basic elements. In this paper, the hybrid optical bistability and optical limiter characteristics are realized by means of an electrical linear feedback to a ferroelectric liquid crystal cell (SSFLC cell). If the feedback gain is positive, the optical bistability is obtained while the optical limiter characteristics are obtained if the gain is negative. Also, it was demonstrated that by instantaneously increasing or cutting the incident optical intensity in a pulsed state in the optical bistability region, the transmission light intensity can be switched from the low‐transmission state to the high‐transmission state or from the high‐ to low‐transmission state. The minimum pulsewidth needed for switching is 70 μs for the low‐transmission state to the high‐transmission state and 50 μs for the high‐transmission state to the low‐transmission state. Since the speed is very fast, the high‐speed response of the ferroelectric liquid crystal is used effectively.