| US 7,489,868 B2 | ||
| Apparatus for measuring optical beat interference noise in subcarrier multiple access optical network | ||
| Seung Hyun Jang, Jeju-si (Korea, Republic of); Chul Soo Lee, Daejeon (Korea, Republic of); Eui Suk Jung, Daejeon (Korea, Republic of); and Byoung Whi Kim, Daejeon (Korea, Republic of) | ||
| Assigned to Electronics and Telecommunications Research Institute, Daejeon (Korea, Republic of) | ||
| Filed on Apr. 19, 2005, as Appl. No. 11/110,134. | ||
| Claims priority of application No. 10-2004-0104379 (KR), filed on Dec. 10, 2004. | ||
| Prior Publication US 2006/0127092 A1, Jun. 15, 2006 | ||
| Int. Cl. H04J 14/00 (2006.01) | ||
| U.S. Cl. 398—70 | 6 Claims |
| 1. An apparatus for measuring Optical Beat Interference (OBI) noise, the apparatus being applied to a central office included
in a Subcarrier Multiple Access (SCMA) optical network, the central office including an optical receiver for converting an
optical signal received through an optical fiber into an electrical signal, the apparatus comprising:
a power divider for dividing the power of a signal output from the optical receiver into two signals;
a first filter for passing one of the two signals divided by the power divider in a low band of frequencies below a band of
subcarrier signals;
a second filter for passing the other of the two signals divided by the power divider in a high band of frequencies above
the band of subcarrier signals;
a power measurement unit for measuring power of each signal passed through the first and second filters; and
a signal processor for measuring OBI noise level based on power values measured by the power measurement unit, wherein the
signal processor measures OBI noise level by selecting the larger or smaller of two power values measured respectively by
the first and second power meters.
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