Fiber-optic amplifier with a facility for monitoring the pump po

Details Fiber-optic amplifier with a facility for monitoring the pump po Fiber-optic amplifier with a facility for monitoring the pump po

1994-06-24

1995-08-15

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359110, 359177, H04B 1002

Patent

active

054424798

ABSTRACT:
In fiber-optic amplifiers, various parameters, such as the input power, are measured to obtain information on the operating condition of the transmission link and of the fiber-optic amplifier itself. In prior art fiber-optic amplifiers, a portion of the input power is coupled out for this purpose by means of a coupler (2). If low-power optical signals such as digital signals are transmitted, the coupled-out portion of the input power can only be detected with complicated and costly circuitry. In the novel fiber-optic amplifier, the pump power and input power are monitored by coupling out and evaluating the radiation resulting from amplified spontaneous emission (ASE). This provides information on the state of the input signal.

REFERENCES:
patent: 4887309 (1989-12-01), Anderson et al.
patent: 5295015 (1994-03-01), Yoneyama
patent: 5299048 (1994-03-01), Suyama
patent: 5315674 (1994-05-01), Asako
patent: 5345332 (1994-09-01), daSilva et al.
"Progress in Optical Amplification", J. Auge et al, Electrical Communication, 4th Quarter 1992, pp. 37-44.
"Optische Nachrichtentechnik", G. Grau, Springer-Verlag, Berlin, Heidelberg, New York, Tokyo, 3nd Ed. 1986, pp. 296-302.
Patent Abstracts of Japan, vol. 17, No. 706 (E-1483) Dec. 22, 1993 & JP-A-05243641 (NEC Corp) Sep. 21, 1993.

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