Optical: systems and elements – Optical amplifier – Bistable
Patent
1990-06-18
1992-05-05
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Bistable
377102, 372 21, 359345, H01S 3103, G02F 128
Patent
active
051111535
ABSTRACT:
An optical amplifier having a saturable absorption region is operated below the lasing threshold for the device. Non-linear effects and bistability are observable at temperatures above room temperature. A selected input wavelength .lambda..sub.i within the gain spectrum of the device is amplified and an output at the same wavelength .lambda..sub.i is produced. This is in contrast to the normal operation at threshold, where there is a wavelength shift to the lasing wavelength and, depending on the laser used for the naturable absorption device, the output may be multimode for a monomode input. Best gain is achieved by tuning the input wavelength to a peak of a Fabry-Perot mode in the gain spectrum for the amplifier.
The amplifier may be used as wavelength controlled optical switch, when operated bistably, or as a regenerative amplifier when operated in the non-linear region without hysteresis effects.
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Marshall Ian W.
O'Mahony Michael J.
British Telecommunications public limited company
Moskowitz Nelson
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