Light amplifying apparatus
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United States of America Patent
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Apr 23, 1996
Grant Date -
N/A
app pub date -
Jul 18, 1994
filing date -
Jul 19, 1993
priority date (Note) -
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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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