In-line optical amplifier

Details In-line optical amplifier In-line optical amplifier

1996-06-07

1997-12-30

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359177, H01S 300

Patent

active

057037116

ABSTRACT:
An in-line optical amplifier includes a pumping source, a rare-earth element doped fiber amplifier, a gain regulator and a noise detector. An input power and an output power of the in-line optical amplifier are detected from the input optical signal and the output optical signal, respectively, and then they are used to detect a resultant gain of the in-line optical amplifier. The gain regulator controls the pumping light emitted by a pumping source such that the gain of the rare-earth element doped fiber amplifier is increased and a gain deviation of the resultant gain from a predetermined gain is reduced. The noise detector detects an internal noise or a noise figure based on the gain deviation, for example, by detecting the intensity of the pumping light or the magnitude of drive current of the pumping source.

REFERENCES:
patent: 5374973 (1994-12-01), Maxham et al.
patent: 5517351 (1996-05-01), Hatakeyama
patent: 5563731 (1996-10-01), Asahi
patent: 5633750 (1997-05-01), Nogiwa et al.

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