Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2004-10-18
2008-10-21
Pascal, Leslie (Department: 2613)
Optical communications
Diagnostic testing
Determination of communication parameter
C398S037000
Reexamination Certificate
active
07440695
ABSTRACT:
There are provided a method and system for monitoring an optical transmission line. The system for monitoring the optical transmission line includes: an OTDR (optical time-domain reflectometer) transmitting a monitoring light to an optical transmission line, measuring a reflected light or backscattered light to monitor the optical transmission line; an optical amplification unit amplifying the monitoring light transmitted on the optical transmission line by using a gain clamped optical amplifier; and a filter unit removing a component having a wavelength outside a wavelength band of the monitoring light from a backward ASE (amplified spontaneous emission) generated by the optical amplification unit. Accordingly, it is possible to extend an optical transmission line monitoring distance of the OTDR. As a result, it is possible to prevent deterioration of the performance of the OTDR because of the backward ASE.
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Chung Hee Sang
Kim Kwang-joon
Lee Dong-han
Lee Han Hyub
Blakely & Sokoloff, Taylor & Zafman
Electronics and Telecommunications Research Institute
Pascal Leslie
LandOfFree
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