Optical current controlled oscillators

Details Optical current controlled oscillators Optical current controlled oscillators

1995-08-23

1996-05-21

Mis, David

Modulators

Frequency modulator

Including microwave or distributed parameter structure

372 38, H03C 300, H01S 310, H01S 313

Patent

active

055193625

ABSTRACT:
The observation of self-sustained pulsation and transient self-pulsation in laser diodes at 1300 nm is described with the effects of optoelectronic feedback on the pulsations. Transient self-pulsation has a lifetime of a few minutes with frequencies up to 7 GHz. The linewidth of self-pulsation is on the order of 0.5 GHz. With optoelectronic feedback, the transient self-pulsation can be stabilized and enhanced. The center frequency of feedback-sustained pulsation is dependent on the passband of the bandpass filter in the feedback loop. The linewidth of feedback-sustained pulsation is significantly reduced to about 20 kHz. The optical spectra of the laser diodes exhibit coherence collapse at weak optoelectronic feedback. The feedback sustained pulsation can be frequency modulated. Applications of the feedback-sustained pulsation include subcarrier multiplexing optical networks.

REFERENCES:
patent: 4961197 (1990-10-01), Tanaka et al.
patent: 5022036 (1991-06-01), Suyama et al.
patent: 5416790 (1995-05-01), Yodoshi et al.

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