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

1997-04-28

2000-02-15

Moskowitz, Nelson

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359134, 359337, 359341, H04B 1002, H01S 316

Patent

active

060259477

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.
patent: 5805322 (1998-09-01), Tomofuji
Japanese Publication "Er:Doped Fiber Amplifer 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 96-44, OPE 94-89 (Nov. 1944): pp. 31-6 & 1-15.
Sugaya et al, OAA '95 paper FC3, 5 Pgs, Jun. 16, 1995.

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