Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1995-09-28
1998-06-16
Shafer, Ricky D.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359484, 359495, 359497, 385 11, 385 18, G02B 530, G02B 2728, G02F 109, G02F 1095
Patent
active
057680051
ABSTRACT:
This invention relates to a reflective optical isolating device having at least two stages. In one embodiment a polarization independent optical isolating device has an input/output end and a reflector at another end. An isolator is disposed between the reflector and the input/output end. The isolator includes a non-reciprocal rotator in the form of a Faraday rotator, and in one embodiment the isolator also includes two reciprocal rotators. A first end of the isolator includes a birefringent crystal for separating an input beam of light in an input direction and for combing two beams of light in an output direction. The isolator also includes a second birefringent crystal at the other end for combining a separated beam of light on route to the reflector and for separating a combined beam of light in the output direction. In one embodiment two separate single isolation stages are provided, and in another embodiment two stage isolation is provided without providing two single stages of isolation.
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Cheng Yihao
Duck Gary S.
JDS Fitel Inc.
Shafer Ricky D.
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