Optical amplifier gain control

Details Optical amplifier gain control Optical amplifier gain control

1990-04-23

1992-05-26

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

372 31, 359174, 359181, H01L 1500, H01S 220, H01S 313

Patent

active

051171961

ABSTRACT:
The gain of an optical amplifier is maintained constant by employing a portion of the amplified optical signal in a feedback loop. In one arrangement this is used to control the output of a pump signal source accordingly. The portion of the said signal corresponds to spontaneous emission (ASE) at a control wavelength or band of wavelengths different to the wavelength of the optical signal output. In the case of an erbium, for example, optical fibre amplifier the portion is preferably ASE at 980 nm, the amplified signal being at 1.535 .mu.m, i.e. completely different transitions in the amplifying medium are used for gain and ASE feedback in order to lessen requirements on the filter used to extract the portion for the feedback loop.

REFERENCES:
patent: 4092615 (1978-05-01), Shimigu
patent: 4246475 (1981-01-01), Altman
patent: 4309671 (1982-01-01), Malyon
patent: 4698817 (1987-10-01), Burley
patent: 4712075 (1987-12-01), Switzer
patent: 4947134 (1990-08-01), Olsson
Baker et al., "Amplification of Mode-Locked . . . Amplifier", Electron. Lett., vol. 25, #17, pp. 1131-1133, Aug. 17, 1989, Abst. only.
Pettitt et al., "System Performance . . . Fibre Preamplifier", Elect. Lett., vol. 25, #4, pp. 273-275, Feb. 16, 1989, Abst. only.

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