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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Transient responding characteristics of semiconductor bistable amplifier

Tingwan Wu, Zhaosheng Zhu

Published Oct 19, 2001• 0 citations
Publisher

Abstract

In this paper we present the results of theoretical analysis and numerical analogue on the transient characteristics of a semiconductor system responding to the incident signal field, especially for the situations in which the system is with lasing effect and display a novel increasing absorption bistable state. The results appear some different features with that of other known bistable device and lasers. These results may be available to a class of excitonic bistable lasing systems.

DOI
10.1117/12.444939

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In this paper we present the results of theoretical analysis and numerical analogue on the transient characteristics of a semiconductor system responding to the incident signal field, especially for the situations in which the system is with lasing effect and display a novel increasing absorption bistable state. The results appear some different features with that of other known bistable device and lasers. These results may be available to a class of excitonic bistable lasing systems.
In this paper we present a theoretical analysis on the effects of increasing absorption and amplification of light in the semiconductor optical bistable system, though the results may be available to a class of excitonic OBS. The Heisenberg equations for the motion of excitons and lightfield modes are deduced. By theoretical analyzing and numerical computing, we study the conditions and characteristics of bistability and lasing. The results how that the system displays different bistabilities depending on the relative intensities of varied interactions, a novel hysteresis loop appears even in the lasing region, thought eh increasing absorption restricts the lasing effect.
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Dispersive bistability arising from the carrier-dependence of the refractive index has been observed in semiconductor lasers operated just below threshold with a small injected optical signal. The minimum optical input required for switch-up is as low as 1 μW for InGaAsP amplifiers at 1.55 μm(1) and 1.3 μm(2) (cf 30 μW for GaAs devices(3)). As yet, reliable measurements of the dynamic response are not (4) available, although we predict recovery times to be on the order of carrier lifetimes, ie a few nanoseconds at room temperature. This contribution will review our experimental and theoretical work on 1.55 μm amplifier bistability and set it in the context of other semiconductor bistable optical devices.
We investigate the bistable response of a traveling-wave semiconductor optical amplifier (SOA) connected bidirectionally to a distributed feedback (DFB) laser diode. By contrast to dispersive DFB amplifiers, bistability is possible for a broad wavelength range of the injected optical signal. A theoretical analysis clarifies the origin of the phenomenon and the conditions under which it occurs. Numerical simulations and experimental results confirm the theoretical analysis. Experimentally obtained step heights up to 25 dB and widths of the bistability domain of 1-4 dB have been found