Optical tristability is demonstrated with a positive feedback circuit composed of a twin-stripe laser diode, a p-i-n photodiode, and a transistor. A novel nonlinearity in the current/light characteristics of the twin-stripe laser diode is the key point in realizing the tristability. By changing the circuit parameters, optical bistability and differential gain characteristics can also be performed.
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Watanabe et al. (1987) studied this question.
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