Optical waveguides – Accessories – Attenuator
Reexamination Certificate
2005-07-05
2005-07-05
Font, Frank G. (Department: 2883)
Optical waveguides
Accessories
Attenuator
C385S016000, C385S018000, C385S031000, C385S032000, C385S033000, C385S036000
Reexamination Certificate
active
06915061
ABSTRACT:
A variable optical attenuator includes a first lens, a MEMS device, a second lens, and a wedge. The first lens is configured to collimate an input light received on a first port and focus an output light on a focus point proximate to a second port. The MEMS device includes a reflection surface having a tilting angle thereof controllable by a control variable. The second lens has a focus point positioned proximate to the reflection surface of the MEMS device. The wedge is positioned between the first lens and the second lens and is configured to refract the input light received from the first lens to enter the second lens and refract the output light received from the second lens to enter the first lens.
REFERENCES:
patent: 6084994 (2000-07-01), Li et al.
patent: 6597825 (2003-07-01), Yuan et al.
patent: 6694073 (2004-02-01), Golub et al.
patent: 6781730 (2004-08-01), Weaver et al.
Andersen, et al., “MEMS Variable Optical Attenuator for DWDM Optical Amplifiers,” OSATrends in Optics and Photonics(TOPS), vol. 37,Optical Fiber Communication Conference, Technical Digest Postconference Edition (Optical Society of America, Washington, DC, 2000), pp. 260-262.
Li Wei-Zhong
Wang Wenhui
El-Shammaa Mary
Fish & Richardson P.C.
Font Frank G.
Oplink Communications Inc.
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