Low noise optical amplifier and optical communication system using the same
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United States of America Patent
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Jul 20, 2004
Grant Date -
Mar 20, 2003
app pub date -
Aug 30, 2002
filing date -
Sep 7, 2001
priority date (Note) -
Expired
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Abstract
A low noise optical amplifier used in an optical communication system includes optical amplifying elements for amplifying optical signals of a specific wavelength(.lambda.) incident from their ends(F.sub.1,F.sub.2) and endowing phase difference between ASEs, optical diverging means to interfere the amplified optical signals and the ASEs output from both ends(F.sub.1,F.sub.2), first path of length(L.sub.1) to optically connect the one end(F.sub.1) to first gate(D.sub.1) of the optical diverging means, and second path of length(L.sub.2) to optically connect the other end(F.sub.2) to second gate(D.sub.2) of the optical diverging means. The first and second paths are designed with distance(L.sub.1 -L.sub.2) so that the amplified optical signal causes reinforcing interference at the third gate(D.sub.3) and destructive interference at the fourth gate(D.sub.4), and the ASE causes destructive interference at the third gate(D.sub.3) and reinforcing interference at fourth gate(D.sub.4).
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