Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1987-07-28
1988-12-06
Tarcza, Thomas H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
350356, H01L 3102
Patent
active
047898437
ABSTRACT:
An optical modulator for modulating a light beam includes a laser diode having an active region with optically flat faces at opposite ends thereof. The modulator is constructed so that oscillation of the laser diode is suppressed and a time-varying electrical modulation signal is applied to the active region. An optical isolator includes a first electronically controlled optical switch coupled to the isolator input, a second electronically controlled optical switch coupled to the isolator output and means for optical coupling between the first switch and the second switch and having associated delay T.sub.0. Square wave actuation signals are applied to the first and second switches. The square wave signals each have a cycle time T.sub.p =4T.sub.0 and the square wave signal applied to the second switch is delayed relative to the square wave signal applied to the first switch by a time T.sub.0. A single channel isolator provides a 50% duty cycle output, while a two-channel isolator having control signals delayed by one half cycle provides 100% duty cycle output. The isolator control signals can be gated with a modulation signal to provide both modulating and isolating functions.
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"Optics", Hech et al., Feb. 1979, pp. 482-485, Addison-Wesley pub.
Hellner Mark
Tarcza Thomas H.
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