Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1976-10-22
1978-10-03
Moskowitz, Nelson
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
350 9630, 350359, 350 9615, G02B 114
Patent
active
041186761
ABSTRACT:
A method and apparatus for driving an optical waveguide with a coherent source of radiation. The apparatus includes means for providing a relatively high level of continuous wave (cw) coherent optical/infrared radiation in a closed waveguide, preferably traveling in one direction, means for scattering the optical radiation out of the closed waveguide, and means for collecting the scattered radiation in an adjacent waveguide for transmission to distant points. The cw coherent radiation is preferably generated within a single-frequency traveling-wave multi-turn Nd: YAG laser. A first waveguide is coupled at the ends to form a multi-turn laser or a closed loop system. The scattering means includes means for impressing a microwave modulating signal onto the first waveguide at the Bragg angle which serves to set up an effective optical grating within the first waveguide for scattering the laser beam. The second or output waveguide is positioned with respect to the scattered beam for intercepting same to travel along its optical axis. In a preferred embodiment, the second waveguide is potted in a parallel relationship with the first waveguide and includes an inclined end surface for redirecting the scattered radiation along its optical axis.
REFERENCES:
patent: 3408131 (1968-10-01), Kapany
patent: 3571737 (1971-03-01), Miller
patent: 3808549 (1974-04-01), Maurer
patent: 3871743 (1975-03-01), Fulenwider
patent: 3919669 (1975-11-01), Hartemann
patent: 3920982 (1975-11-01), Harris
patent: 3990780 (1976-11-01), Dakss
Kapany, "Laser and Fiber Optics," pp. 1-7, Laser Focus, Jul. 1967.
Cunningham et al., "Integrated Optics Update," Aug. 1976, pp. 62-64, Elec-Optical Systems Design.
Edelberg Nathan
Elbaum Saul
Gibson Robert P.
Moskowitz Nelson
The United States of America as represented by the Secretary of
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