Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1994-07-18
1996-04-23
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359176, 359160, H01S 0300
Patent
active
055109306
ABSTRACT:
A light amplifying apparatus adopting a redundant structure. Optical isolators 13, 14 are inserted between pump light sources 1, 2 and a photocoupler 4 so as to prevent injection locking, thereby preventing fluctuation of pump power.
In another embodiment, optical fibers 15 adequately longer than the coherence length of the excitation light waves output from the pump light sources are provided. In still another embodiment, the frequency of the driving current for the pump light sources is modulated. In a further embodiment, wave plates 20, 21 are provided so as to circularly polarize the light waves output from the pump light sources clockwise and counterclockwise.
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patent: 5216728 (1993-06-01), Charlton et al.
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patent: 5367587 (1994-11-01), Mizuochi et al.
"Optical Amplifiers and Their Applications", IEEE Jul. 4-6, 1993 Yokohama, Japan.
Matsuoka, et al, Supervisory Signal Transmission Methods for Optical Amplifier Repeater Systems, pp. 1845-1850 Transmission Systems Laboratories, Japan.
Abe Haruo
Akiba Shigeyuki
Goto Koji
Kitayama Tadayoshi
Motoshima Kuniaki
Hellner Mark
Mitsubishi Denki & Kabushiki Kaisha
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