Polarization independent optical isolator

Details Polarization independent optical isolator Polarization independent optical isolator

1993-12-03

1997-11-18

Shafer, Ricky D.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359484, 359487, 359495, 359497, 372703, 385 34, 385119, G02B 530, G02B 2728, G02F 109

Patent

active

056893590

ABSTRACT:
A polarization independent optical isolator for transmitting a signal ray in a forward direction and suppressing backward transmission comprises: a first and second optical isolation unit for receiving, transmitting, and outputting signal rays in the forward direction and for suppress backward transmission of any rays; and a reflection unit for coupling to first and second optical isolation unit by directing the outputted signal ray from the first optical isolation unit to the second optical isolation unit, the signal ray received by the first optical isolation unit transmitting in the opposite direction to the outputted signal ray from the second optical isolation unit. A reflection protection unit may be provided to prevent undesired reflection at inlet of the optical isolator. A optical filter for reflecting a component having a predetermined wavelength and transmitting remaining component may be used for the reflection unit. An optical detector may be used for monitoring the remaining component. An absorber may be used for absorbing the remaining components. A half mirror may be used for the reflection unit for monitoring the signal ray.

REFERENCES:
patent: 4770505 (1988-09-01), Okazaki
patent: 4893890 (1990-01-01), Lutes
patent: 5033830 (1991-07-01), Jameson
patent: 5089786 (1992-02-01), Tamura
patent: 5299056 (1994-03-01), Kurata et al.
patent: 5499132 (1996-03-01), Tojo et al.
patent: 5574595 (1996-11-01), Kurata et al.

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