Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1997-03-31
2000-09-12
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359177, H01S 300, H04B 1002
Patent
active
061185760
ABSTRACT:
Two rare earth-doped optical fibers are connected in series and used to amplify input light. A splitter is installed between these two rare earth-doped optical fibers. The input light is monitored by having the portion of the input light that is branched off by the splitter received by a photodiode. Excitation light output from a laser light source is guided by optical couplers and supplied to the above rare earth-doped optical fibers. A control circuit controls the output light level and, at the same time, stops the output from the laser light source when the input light level drops below a specified threshold value. The gain of the first stage rare earth-doped optical fiber while excitation light is being supplied is larger than the loss that occurs due to branching of the input light by the splitter.
REFERENCES:
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patent: 5535037 (1996-07-01), Yoneyama
patent: 5539563 (1996-07-01), Park
patent: 5673142 (1997-09-01), Fatehi et al.
M.N. Zervas, et al. "Twin-Core Fiber Erbium-Doped Channel Equalizer"; Journal of Lightware Technology, vol. 13, No. 5, May 1995, pp. 721-722.
International Search Report of PCT/US96/14234.
European Search Report fo EP 95 11 7855.
Onoda Yoshihito
Sugiya Hideaki
Fujitsu Limited
Hellner Mark
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