Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1990-08-23
1992-05-26
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359337, 359343, 359179, G02B 626, H01S 220, G02F 100
Patent
active
051173034
ABSTRACT:
In a transmission system having concatenated optical amplifiers, gain saturation of the optical amplifiers at any stage is caused by the extraction of power from the amplifier by the ASE and amplification of the signal and of the ASE from previous stages. Three methods of operating transmission systems are classsified as free-running, constant-total power and constant-signal power. Differences in performance of the three systems arise from the propagation of signal power and the buildup of the ASE. It is now disclosed that the buildup of ASE noise in a system of either lumped or distributed concatenated optical amplifers can be limited by operating at least a plurality of the optical amplifers to provide unsaturated gain which is greater than the loss of the system and/or each optical amplifier is operated in its saturated state.
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Masuda et al.; "High Gain Two-Stage Amplification . . . "; May 1, 1990, Elect. Lett., vol. 26, #16, pp. 661-662; abst. only provided.
Desurvire, R.; "Analysis of Transient Gain Saturation . . . "; Aug. 1989, IEEE Photonics Technol. Lett., vol. 1, #8, pp. 196-199; abst. only provided.
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Desurvire Emmanuel
Giles Clinton R.
AT&T Bell Laboratories
Moskowitz Nelson
Weiss Eli
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