Hon Hai Precision Industry Co., Ltd.

Chung-Chih Wang

Yao-Hao Chang

Kun-Tsan Wu

An optical loop-back attenuator ( ) includes a frame ( ), a cover ( ) attached to the frame, an optical fiber ( ), an optical fiber fixture ( ) retaining and fixing the optical fiber, and two SC plug connectors ( ) receiving and retaining opposite ends of the optical fiber therein. The frame and the cover cooperate to fittingly receive the optical fiber, the optical fiber fixture and portions of the SC plug connectors therein. The optical fiber has a bent part ( ) which is configured to be semicircular or to have another suitable shape that achieves a desired attenuation.

Optical loop-back attenuator

An electrical variable optical attenuator includes a housing ( ), a cover ( ), an optical module ( ), and a shifting device ( ). The optical module comprises a reflective device ( ), a graded transmittance filter ( ), a filter carrier ( ), and a container ( ). The reflective device is an integrated piece comprising a first reflective plane ( ), a second reflective plane ( ), and an opening ( ) movably accommodating the graded transmittance filter therein. The first and the second reflective planes are substantially perpendicular to each other. Because the first and second reflective planes are integrally formed on the reflective device, the attenuator is relatively easy to assemble. In addition, the attenuator is able to operate reliably in rugged conditions, including applications where the attenuator may be subjected to vibration, shock or extreme temperatures.

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Tu-Chen, Taiwan

Chung-Chih Wang