Photo isolator

Details Photo isolator Photo isolator

1993-08-31

1995-09-05

Sugarman, Scott J.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359279, 359260, 359183, G02F 101

Patent

active

054483964

ABSTRACT:
A photo isolator transmits light of a frequency fo in the normal direction and substantially intercepts the light in the reverse direction. A phase modulator comprising an optical crystal having a refractive index, counter faces and counter electrodes formed on the counter faces. The phase modulator receives an electrical signal having a frequency of .DELTA.f or higher and changes the refractive index of the optical crystal by the Pockels effect. A narrow band pass filter has a half band width of .DELTA.f, is mounted on an optical axis, and substantially transmits light having frequency of from (fo-.DELTA.f) to (fo+.DELTA.f). The phase modulator is juxtaposed with the narrow band pass filter on the optical axis.

REFERENCES:
patent: 3584959 (1971-06-01), Del Carlo
patent: 4209690 (1980-06-01), Rentzepis
patent: 4783361 (1988-11-01), Ovshinsky et al.
patent: 5128798 (1992-07-01), Bowen et al.
patent: 5287214 (1994-02-01), Robertson et al.
patent: 5303020 (1994-04-01), Croteau

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