Optical amplifying system having multiple branching units and me

Details Optical amplifying system having multiple branching units and me Optical amplifying system having multiple branching units and me

1997-07-25

1999-04-20

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

H01S 300

Patent

active

058962212

ABSTRACT:
An optical amplifier circuit includes an optical amplifying unit for amplifying a light signal having a predetermined wavelength to output an amplified light signal, first and second optical branching units each for branching a part of the amplified light signal to output branched light signals, and a band rejection optical filter for removing light within a center wavelength band to allow only spontaneous emission light to be selectively transmitted. A subtractor outputs a control signal according to a difference between the light signal branched by the first optical branching unit and the spontaneous emission light. A controller controls the output of the amplified light signal based on the control signal, thereby to maintain precisely a constant light output level.

REFERENCES:
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patent: 5506724 (1996-04-01), Shimizu et al.
patent: 5600481 (1997-02-01), Nakabayashi
patent: 5706126 (1998-01-01), Fujita
Masayuki Nishimura, et al., "Low Noise Figure Erbium-Doped Fiber Amplifiers with Gain Adjustment by Pump Power Control", Topical Meeting on Optical Amplifiers and Applications, 1992, paper FB4, Technical Digest Series, vol. 17, 170-173, Optical Society of America, Washington, D.C.

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