Optical transmission system, optically branching apparatus and optical signal processing apparatus
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United States of America Patent
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-
Dec 4, 2001
Grant Date -
N/A
app pub date -
Mar 4, 1998
filing date -
Mar 4, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In an optical transmission system, an optical transmission line has up and down systems and loops back a supervisory light between the up and down systems. Trunk stations are provided at both ends of the optical transmission line and one or more optically branching units are provided in the optical transmission line for add/dropping a specific wavelength respectively. A branch station is connected to each of one or more the branching units. A bypass line for bypassing the supervisory light is provided in each of the one or more optically branching units.
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