Alliance Fiber Optic Products, Inc.

Jerry Lee

Zhupei Shi

Li Wang

Minh Quang Tran

Tongxin Lu

QiKiao Chen

Tim Wang

A fiber optical circulator includes a first collimator and a second collimator sandwiching a circulator core therebetween. The first collimator and the second collimator respectively define Portand Portthereof, and the first collimator further defines Portthereof. The circulator core includes a first crystal and a second crystal at two ends respectively confronting the first collimator and the second collimator aside. The circulator core further includes a first group of two half-wavelength waveplates and a first Faraday rotator, and second subassembly a second group of two half-wavelength waveplates and a second Faraday rotator. A third crystal is disposed between the first subassembly and the second subassembly wherein a backward light path from Portto Portpasses the third crystal and is deflected by the third crystal toward the first collimator though total internal reflection.

Fiber optical circulator

A controllable attenuator includes a pair of collimators respectively connected to input and output fibers. A pair of reflection devices are respectively positioned behind the pair of collimators opposite to the corresponding input and output fibers. A U-like light path is defined among the pair of collimators and the pair of reflection devices. A neutral density filter is moveably positioned between the pair of reflection devices wherein a moving direction of the filter is preferably parallel to a longitudinal direction of the pair of collimators. An ND filter position indicator such as a potentiometer, is used to dynamically monitor attenuation setting.

Controllably variable optical attenuator

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Saratoga, CA, United States of America

Jerry Lee