The characteristics for a twin-guide (TG) laser modulated by a reverse bias are studied for the first time. The extinction ratio and the wavelength shift are 20 dB with only 1 V bias and −0.4 nm, respectively. Further, the characteristics of a TG modulator itself (that has the same structure as the TG laser) are measured under a driving current lower than the threshold. The possibility of integrating a TG modulator with a tunable twin-guide (TTG) laser is presented.
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Yamamoto et al. (1991) studied this question.
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