Method and system for equalizing respective power levels of chan

Details Method and system for equalizing respective power levels of chan Method and system for equalizing respective power levels of chan

1996-09-06

1998-09-29

Lefkowitz, Edward

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359124, 359161, 359176, 359179, H04B 1000

Patent

active

058152997

ABSTRACT:
A method for equalizing power levels of channels of an optical frequency division multiplexed signal determines the power level of each channel of the optical frequency division multiplexed signal and introduces attenuation into the channels having high power levels corresponding to the difference between a level deduced from these high levels and a low reference level. The equalization system includes at least one optical equalizer module which measures the optical power levels of the channels of the signal to be monitored, a processor for implementing the method and variable attenuators controlled by the processor and operating separately on the power levels of the channels.

REFERENCES:
patent: 4238648 (1980-12-01), Epworth
patent: 5077728 (1991-12-01), Kaminou
patent: 5260823 (1993-11-01), Payne et al.
patent: 5276543 (1994-01-01), Olshansky
patent: 5278687 (1994-01-01), Jannson et al.
patent: 5500756 (1996-03-01), Tsushina et al.
Kyo Inoue et al, "Tunable Gain Equalization Using a Mach-Zender Optical Filter in Multistage Fiber Amplifiers", IEEE Photonics Technology Letters, vol. 3, No. 8, Aug. 1, 1991, pp. 718-720.

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