Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1998-02-03
2000-03-07
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359161, 359124, H01S 306
Patent
active
060348127
ABSTRACT:
A gain equalizer for an optical amplifier having a gain characteristic giving a gain peak. The gain equalizer includes first, second, and third gain equalizers operatively connected to the optical amplifier. The first gain equalizer has a first loss characteristic (wavelength dependence of loss) giving a maximum loss at or near a wavelength giving the gain peak. The second and third gain equalizers have periodic second and third loss characteristics, respectively. The period of the second loss characteristic is shorter than the period of the third loss characteristic. Each of the second and third loss characteristics gives a maximum loss at or near a wavelength giving one of two gain peaks remaining when the gain characteristic of the optical amplifier is equalized by the first gain equalizer only. With this configuration, gain equalization can be performed with high accuracy. The loss characteristic required by each of the three gain equalizers is simple, so that the configuration of each gain equalizer can be simplified.
REFERENCES:
patent: 5912750 (1999-06-01), Takeda et al.
patent: 5920424 (1999-07-01), Espindola et al.
First Optoelectronics and Communications Conference (OECC '96) Technical Digest, Jul. 1996, Makuhari Messe, "85-Gb/s WDM Transmission Experiment over 7931 km Using Gain Equalization to Compensate for Asymmetry in EDFA Gain Characteristics", Takao Naito, et al., pp. 4-5.
OFC '97 Technical Digest, Conference on Optical Fiber Communications, "128-Gbit/s WDM Transmission of 24 5.3-Gbit/s RZ Signals Over 7828 km Using Gain Equalization to Compensate for Asymmetry in EDFA Gain Characteristics", Takao Naito, et al., pp. 45-46.
Fujitsu Limited
Hellner Mark
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