Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1998-05-22
2000-05-02
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359134, H01S 300
Patent
active
060579595
ABSTRACT:
An optical amplifier is disclosed having substantially uniform spectral gain. The amplifier comprises a variable optical attenuator coupled between first and second segments of active optical fiber. The attenuation of the optical attenuator is adjusted in accordance with the optical power input to the amplifier to thereby obtain substantially flattened gain. Alternatively, the attenuator can be controlled based on the respective gains associated with the first and second segments of optical fiber. For example, the attenuator can be adjusted so that so that the sum of the two gains remains substantially constant, a condition that also yields flat spectral gain. Further, optical powers associated with first and second wavelengths of amplified stimulated emission (ASE) light output from the amplifier can be used to adjust the attenuation of the optical attenuator. In an additional example, received optical powers associated with each of the channels in a WDM system are monitored and the attenuators within each amplifier in the system are controlled so that the received powers are substantially equal.
REFERENCES:
patent: 5557442 (1996-09-01), Huber
patent: 5675432 (1997-10-01), Kosaka
patent: 5808762 (1998-09-01), Vanoli et al.
patent: 5812710 (1998-09-01), Sugaya
patent: 5903385 (1999-05-01), Sugaya et al.
Sridhar Balakrishnan
Taylor Michael G.
Ciena Corporation
Hellner Mark
Soltz David L.
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