Method and apparatus for combining add/drop optical signal lines

Details Method and apparatus for combining add/drop optical signal lines Method and apparatus for combining add/drop optical signal lines

1996-10-10

1998-02-17

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359124, H01S 0300

Patent

active

057196974

ABSTRACT:
An optical signal processing method and apparatus for providing a noise feedback loop that uses existing noise within the optical system to saturate a chain of amplifiers after the branching unit, thereby preventing information channels in a WDM signal containing empty channels from becoming overamplified as they pass through downstream amplifiers. The method and apparatus uses an existing drop amplifier which emits ASE noise as a side effect. A coupler connects the ASE noise to a filter. The filtered ASE noise is fed into an existing trunk amplifier by a second coupler. The trunk amplifier increases gain to the filtered ASE noise to a level high enough to saturate the amplifier chain, without requiring an external noise generating device.

REFERENCES:
patent: 5463487 (1995-10-01), Epworth
patent: 5566018 (1996-10-01), Lee et al.
patent: 5612805 (1997-03-01), Fevrier et al.

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