Optical: systems and elements – Optical amplifier
Patent
1992-03-13
1994-05-31
Lobo, Ian J.
Optical: systems and elements
Optical amplifier
G02F 100
Patent
active
053174488
ABSTRACT:
A method for controlling an optical amplifier that amplifies an input optical beam according to a characteristic curve. The characteristic curve changes depending on an optical power of the input optical beam, and the optical amplifier operates according to a first reference characteristic curve when an input optical beam having a first reference optical power level of the input optical beam, below which first reference optical power level a further reduction in the optical power level of the input optical beam does not produce any substantial change in the relationship of the optical gain of the optical amplifier as a function of a change in wave length of the input optical beam, and accordingly of the first reference characteristic curve; is supplied as a first reference optical power. Further, the optical amplifier operates according to a second reference characteristic curve when an input optical beam having a second reference optical power is supplied, wherein the second reference power is defined such that the second reference characteristic curve has a peak gain that is smaller than a peak gain of the first reference characteristic curve by three decibels. The method comprises the steps of controlling the optical power of the input optical beam equal to or smaller than the second reference optical power; and setting the wavelength of the input optical beam to fall in a range between a first reference wavelength corresponding to the peak gain of the first reference characteristic curve and a second reference wavelength corresponding to the peak gain of the second reference characteristic curve.
REFERENCES:
patent: 4736164 (1988-04-01), Henning
Fujitsu Limited
Lobo Ian J.
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