Coherent light generators – Particular component circuitry – Optical pumping
Patent
1982-08-11
1985-05-07
Lee, John
Coherent light generators
Particular component circuitry
Optical pumping
372 6, G02B 5172
Patent
active
045154317
ABSTRACT:
An optical fiber bidirectional amplifier includes a pair of small diameter optical fibers, arranged in a side-by-side configuration, the first fiber providing a pumping source and the second fiber doped with a material which will lase at the frequency of the signal to be amplified. The signal to be amplified propagates through the second fiber to stimulate emission of coherent light from the lasing material, resulting in amplification of the signal. The refractive indexes of the first and second fibers are substantially identical, but the coupling characteristic provided by the geometrical relationship between the pair of fibers yields a wavelength dependent coupling efficiency. Specifically, the coupling efficiency at the wavelength of the pumping source is relatively high, while the coupling efficiency at the wavelength of the signal to be amplified is relatively low. Thus, the pumping illumination is coupled from the first fiber to the second fiber to stimulate the doping material in the second fiber, while the signal to be amplified remains relatively uncoupled, and is amplified by the coherent light emitted by the lasing material.
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Chodorow Marvin
Digonnet Michel J. F.
Shaw Herbert J.
Lee John
The Board of Trustees of the Leland Stanford Junior University
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