G - Physics
02
B
88/99
G02B 5/20 (2006.01)
Patent
CA 1147998
Abstract of the Disclosure An optical isolator of reduced insertion loss and fabrication cost which comprises a nonreciprocal optically active element, such as a Faraday rotator, for 45° rotation of polarization, a pair of lenses arranged on the opposite sides of the optically active element and a pair of birefringent crystal plates on the outer sides of the respective lenses having their "principal planes" displaced 45° from each other. The light beam passing through the isolator is most constricted at its opposite ends where the birefringent crystal plates are arranged and this minimizes the amount of offset required between any reflected light and the incident light at the entrance end of the isolator to prevent the reflected light from returning to the light source such as a semiconductor laser, thus enabling substantial reduction in thickness of the birefringent crystal plates. The use of two lens elements is effective to reduce the coupling loss of the isolator.
361374
Nippon Electric Co. Ltd.
Smart & Biggar
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