Electro optic modulator systems for fiber optic information tran

Details Electro optic modulator systems for fiber optic information tran Electro optic modulator systems for fiber optic information tran

1989-11-27

1993-02-09

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359245, 324109, 324 96, 25022721, G02F 103

Patent

active

051856751

ABSTRACT:
A system for transducing a signal voltage into an optical signal, transmitting the optical signal via an optical fiber to a remote location in the form of light attenuation frequency and interpreting the light frequency at the remote location to the amplitude and wave form of the signal voltage. The electro optic modulator includes an elongated piezoelectric member which changes length when an electric field is imposed across it. A mirror is attached to a free end of the piezoelectric member and strains or alternately moves toward and away from a partially reflecting surface at the end of an adjacent optical fiber. Light is introduced into the fiber with a portion reflected back by the movable mirror and part by the end of the fiber. A detector at the second end of the optical fiber receives the reflected light. As the movable mirror is moved in response to voltage changes, the phase changes between the light reflected into the optical fibers from the movable mirror will correspondingly vary with that reflected by the end of the fiber resulting in a light signal corresponding in amplitude and frequency to the original voltage signal. The photo detector at the second end of the fiber converts the optical signal back to a voltage signal.

REFERENCES:
patent: 4322978 (1982-04-01), Fromm
patent: 4547729 (1985-10-01), Adolfsson et al.
patent: 4567771 (1986-02-01), Nelson et al.
patent: 4920310 (1990-04-01), Aoshima et al.
patent: 4950884 (1990-08-01), Banks
Sheiner et al.; "Direct Conversion . . . "; IBM Tech. Dis. Bull.; vol. 22, No. 1; Jun. 1979, pp. 208-209.

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