Wilson W Liu

US Patent:

20040105144, Jun 3, 2004

Filed:

Dec 3, 2002

Appl. No.:

10/310127

Inventors:

William Yang - Fremont CA, US
Li Chen - Fremont CA, US
Frank Levinson - Palo Alto CA, US
Danny Yu - Fremont CA, US
Charlie Zhang - Fremont CA, US
Chase Wang - Fremont CA, US
Wilson Liu - Fremont CA, US

International Classification:

H04B010/12

US Classification:

359/341410

Abstract:

An optical amplifier system for amplifying an input wavelength division multiplexed (WDM) optical signal with a first optical coupler to extract a portion of the power of the input signal, an erbium-doped fiber amplifier to generate an output signal and a second optical coupler to extract a portion of the power of the output signal. A spectral monitoring unit having a volume phase grating separates the extracted input and output signals into spectral components. A photo-detector array of the spectral monitoring unit determines the power level of the spectral components. The system further includes a controller operative to control the operation of the amplifier in response to the power levels of the spectral components.