Optical fiber amplifier

Details Optical fiber amplifier Optical fiber amplifier

H - Electricity

01

S

H01S 3/00 (2006.01) H01S 3/067 (2006.01) H01S 3/091 (2006.01) H01S 3/10 (2006.01) H04B 10/17 (2006.01)

Patent

CA 2162975

An erbium-doped fiber amplifier (EDFA) is comprised of a pre-amp and a post-amp, which are connected in series, a photocoupler, a long wave pass filter (LWPF) and an LWPF controller. The photocoupler is on an input-stage of the EDFA for entering the light signal in the LWPF controller. The LWPF is between a pre-amp and a post-amp, and its cutoff wave- length can be adjustable. A short-wavelength-part of the light signal which is amplified by the pre-amp, is cut off by the LWPF. The LWPF controller detects an input signal power of the input light signal and adjusts the cutoff wavelength of the LWPF based on the detected input signal power. Gain of light signals which are output from the post-amp, are equalized ranging the extensive input signal power and covering wide signal-wavelength bands.

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