07791792 is referenced by 1 patents and cites 29 patents.

An apparatus for suppressing optical power transients includes a variable optical attenuator receiving an input optical signal and outputting an output optical signal; an optical power sensing element coupled to the input optical signal and sensing a portion of the input optical signal; and a feedforward loop controller coupled to the variable optical attenuator and to the optical power sensing element; the feedforward control loop providing feedforward control of the variable optical attenuator to reduce optical power transients of the input optical signal and maintain a substantially constant output power based on the input optical power and a reference value; the variable optical attenuator having a default opaque state in which the input optical signal is substantially attenuated when power is not being supplied to said variable optical attenuator. Variations include feedback loop controllers and a combination feedback and feedforward loop controllers.

Title
Transient optical power suppressing apparatus, method, and network
Application Number
12/174395
Publication Number
7791792 (B2)
Application Date
July 16, 2008
Publication Date
September 7, 2010
Inventor
Denis Zaccarin
San Jose
CA, US
Marc Levesque
San Jose
CA, US
Paul Lundquist
San Jose
CA, US
Agent
Tyler S Brown
Christopher L Bernard
Clements Bernard PLLC
Assignee
Ciena Corporation
MD, US
IPC
G02B 6/26
H04B 10/17
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