Controller which controls a variable optical attenuator to contr

Details Controller which controls a variable optical attenuator to contr Controller which controls a variable optical attenuator to contr

1998-09-22

1999-10-12

Muskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359124, 359179, 359337, H01S 316, H04B 1012

Patent

active

059662379

ABSTRACT:
An optical amplifying apparatus which includes an optical amplifier, an optical attenuator and a controller. The optical amplifier amplifies a light signal having a variable number of channels. The optical attenuator passes the amplified light signal and has a variable light transmissivity. Prior to varying the number of channels in the light signal, the controller varies the light transmissivity of the optical attenuator so that a power level of the amplified light signal is maintained at an approximately constant level that depends on the number of channels in the light signal prior to the varying the number of channels. While the number of channels in the light signal is being varied, the controller maintains the light transmissivity of the optical attenuator to be constant. Subsequent to varying the number of channels in the light signal, the controller varies the light transmissivity of the optical attenuator so that a power level of the amplified light signal is maintained at an approximately constant level that depends on the number of channels in the light signal subsequent to the varying the number of channels.

REFERENCES:
patent: 4644145 (1987-02-01), Gundner
patent: 5396360 (1995-03-01), Majima
patent: 5436760 (1995-07-01), Nakabayashi
patent: 5463487 (1995-10-01), Epworth
patent: 5510926 (1996-04-01), Bayart et al.
patent: 5664131 (1997-09-01), Sugiya
patent: 5764404 (1998-06-01), Yamane et al.
Japanese Publication "Er:Doped Fiber Amplifier for WDM Transmission Using Fiber Gain Control", Technical Report of IEICE, OCS94-66, OPE94, Nov. 1994. (including English language Abstract).
Nakabayashi, et al, Tech. Report of IEICE. OCS 94-66, OPE94-89 (Nov. 1994) pp. 31-36 and 1-15.
Sugaya et al, OAA '95 Paper FC3, Jun. 16, 1995, 5 pages.

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