Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1978-04-19
1980-03-25
Moskowitz, Nelson
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
455612, 455613, 455617, H04B 950, H01S 310
Patent
active
041952693
ABSTRACT:
An injection laser diode is at one end of an optical fiber to direct modulated optical radiation into the fiber. At the other end of the fiber is a detector, such as a semiconductor photodetector, for the modulated radiation. Between the other end of the optical fiber and the detector is a reflecting shutter which is adapted to periodically reflect some of the radiation, at a lower frequency rate, back along the optical fiber to the injection laser. The radiation reflected back into the injection laser causes a variation in the characteristics of the laser so that the laser operates as a detector for the reflected radiation.
REFERENCES:
patent: 3584220 (1971-06-01), Namupa et al.
patent: 3989942 (1976-11-01), Waddoups
patent: 4070118 (1978-01-01), Maslowski et al.
Mitsuhashi et al., "Self Coupled Optical Pickup," 4/76, pp. 5-7, Optics Commun., vol. 17, #1.
Wettke et al., "Optimized LED For Single Fiber Optical Links," 2/76, pp. 1-79, RCA Lab. Final Rept. PRRL-76-CR-15 Abst.
Seko et al., "Self-Quenching. . .Readout," 8/1/75, pp.140-141, Appl. Phys. Lett., vol. 27, #3.
Morikawa et al., "Return Beam. . .Lasers," 8/19/76, pp. 435-436, Electronic Letters, vol. 12, #17.
Ettenberg Michael
Kressel Henry
Christoffersen H.
Cohen D. S.
Moskowitz Nelson
RCA Corporation
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