Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1995-03-21
1996-07-23
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359177, H01S 300
Patent
active
055395708
ABSTRACT:
In a method of monitoring an optical amplifier in an optical communication system, an optical signal is optically amplified in response to a drive current by an optical amplifier which includes at least one optically active element and a group of optically passive elements including a rare earth element doped optical fiber. The intensity of light emitted from the optically active element is monitored to generate a first monitor signal indicative of the intensity of light emitted from the optically active element. Also, the optical fiber is monitored for an optical amplification of the optical amplifier. The drive current is supplied to the optical amplifier based on the second monitor signal. The states of the optically active element and the group of optically passive elements are determined based on the first monitor signal and a second monitor signal corresponding to the drive current.
REFERENCES:
patent: 5101461 (1992-03-01), Nakajima
patent: 5268786 (1993-12-01), Matsushita et al.
patent: 5291326 (1994-03-01), Heidemann
patent: 5299048 (1994-03-01), Suyama
patent: 5374973 (1994-12-01), Maxham et al.
Hellner Mark
NEC Corporation
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