Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2005-04-19
2009-02-10
Wang, Quan-Zhen (Department: 2613)
Optical communications
Multiplex
Broadcast and distribution system
Reexamination Certificate
active
07489868
ABSTRACT:
An apparatus for measuring Optical Beat Interference (OBI) noise is applied to a central office in a Subcarrier Multiple Access (SCMA) optical network. The central office includes an optical receiver for converting an optical signal received through an optical fiber into an electrical signal. The OBI noise measurement apparatus includes a power divider, first and second filters, and a power measurement unit. The power divider divides the power of a signal output from the optical receiver into two signals. The first filter passes one of the two signals divided by the power divider in a low band of frequencies below a band of subcarrier signals. The second filter passes the other of the two signals divided by the power divider in a high band of frequencies above the band of subcarrier signals. The power measurement unit measures the power of each signal passed through the first and second filters.
REFERENCES:
patent: 6417942 (2002-07-01), Seto et al.
patent: 2294372 (1996-04-01), None
S. Soerensen, “Optical Beat Noise Suppression . . . ”, Journal of Lightwave Technology, vol. 18, No. 10, Oct. 2000 (pp. 1337-1347).
Jang Seung Hyun
Jung Eui Suk
Kim Byoung Whi
Lee Chul Soo
Blakely , Sokoloff, Taylor & Zafman LLP
Electronics and Telecommunications Research Institute
Wang Quan-Zhen
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