Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1998-09-29
1999-11-23
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
H01S 300
Patent
active
059910712
ABSTRACT:
The present invention aims at providing an optical fiber amplifier in which a pumping light is rendered to make two or more reciprocations within an active optical fiber so as to enhance a conversion efficiency of power of pumping light thereby realizing further high-powerization. To this end, the present optical fiber amplifier is constituted of: a pumping light generating part for generating, based on a signal from an oscillator, the pumping light of which central wavelength is periodically varied; a multiplexer for multiplexing the pumping light and the signal light; an optical filter of central transmission wavelength variable type, which is coupled to one end of the active optical fiber, and has a transmission wavelength band narrower than a wavelength variation range of the pumping light, in which the central transmission wavelength of the transmission wavelength band is varied consistently with the central wavelength of the pumping light, based on a signal from a modulation circuit; and an optical reflector, which is coupled to the other end of the active optical fiber, and which reflects the pumping light and transmits the signal light.
REFERENCES:
patent: 5563732 (1996-10-01), Erdogan et al.
patent: 5640268 (1997-06-01), Chesnoy
patent: 5712715 (1998-01-01), Erdogan et al.
Fujitsu Limited
Hellner Mark
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