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US 5,563,732 AGranted
Laser pumping of erbium amplifier
AssigneeAT&T Corp.
InventorsTuran Erdogan, Clinton R. Giles, Victor Mizrahi
Life of this patent
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Abstract
Stability of a pump laser for activating an erbium amplifier is enhanced by a grating which results in laser operation in the coherence collapse regime.
Claims13
Apparatus comprising a laser and a fiber grating together defining an "external cavity" to produce output of decreased susceptibility to fluctuation-inducing conditions including spurious reflections
- CHARACTERIZED IN THAT
- the power reflectivity of the grating, R.sub.o is in the range of -30 dB to -5 dB and bears the relationship to the power reflectivity of the laser grating R:
- R.sub.o >0.01R/(1-R).sup.2 and in that the laser emission is broadened to at least 1 GHz as measured 3 dB down from the peak of the laser emission.
Process including optical amplification of an optical fiber signal of a carrier wavelength of approximately 1550 nm, comprising amplifying the signal with an optical amplifier and energizing the amplifier by a pump laser
- CHARACTERIZED IN THAT
- the laser is coupled with a fiber grating to produce an external cavity with an output bandwidth of at lest 1 GHz as measured in 3 dB down from the peak value of the laser emission, whereby susceptibility of the output to spurious reflections at the amplifier output is reduced.
Dependencies are inferred from the claim text.