Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1992-03-05
1993-12-07
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359177, 369106, G02F 139, H04B 1000, H01S 306
Patent
active
052687864
ABSTRACT:
A optical signal from the input terminal 6a is amplified and goes through the optical fiber doped with rare earth. The excitation lights from the excitation light sources 2 and 3 are synthesized at the optical coupler 4 and outputted to the optical fiber doped with rare earth 1 through the optical coupler 5. A part of the light is branched from the optical coupler 11 to optical receiver 14 through the band pass light filter 13. The optical receiver 14 converts the received optical signal to an electrical signal and outputs it to the error signal output circuit 114. The receiving current is amplified in the error signal output circuit 114 and branched to the excitation light source output control circuits 9 and 10. The excitation light source output control circuits 9 and 10 execute feedback control so as to obtain a constant excitation light level outputted to the optical fiber doped with rare earth from the excitation light sources 2 and 3, in response to the output signal of the optical receiving circuits 7 and 8, and the output signal of the error signal branching circuit 115.
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Desurvire et al; IEEE Photonics Technol. Lett., vol. 3, No. 5, pp. 453-455, May 1991.
Kitayama Tadayoshi
Matsushita Kiwami
Miyazaki Mayumi
Mizuochi Takashi
Mitsubishi Denki & Kabushiki Kaisha
Moskowitz Nelson
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