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Title:
OPTICAL NETWORK BAND CONTROL APPARATUS AND OPTICAL NETWORK BAND CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2010/064554
Kind Code:
A1
Abstract:
Provided are an optical network band control apparatus and an optical network band control method wherein the sensitivity of receiving an upstream signal light will not be degraded.  A band control apparatus comprises: a light emission control unit that causes a light source located at a first node to perform a light emission for a predetermined time period until a time t0 and provides a first optical signal generated by the light source through a transmission path to a second node; an influence factor determining unit that, when a part of the first optical signal is reflected, as a return light, on the transmission path toward the first node, determines, as an influence factor, a parameter based on the status of the return light; a first relationship calculating unit that calculates, as a first relationship, the relationship between a time having elapsed since the time t0 and the influence factor; and a control unit that decides, based on the first relationship, a time slot to be used for communication between the first and second nodes.  The first node is so configured as to receive, during the decided time slot, an upstream signal light generated by the fact that a downstream signal light generated by the light source is reflected and modulated at the second node.

Inventors:
TAKAHASHI SEIGO (JP)
TAJIMA AKIO (JP)
Application Number:
PCT/JP2009/069771
Publication Date:
June 10, 2010
Filing Date:
November 24, 2009
Export Citation:
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Assignee:
NEC CORP (JP)
TAKAHASHI SEIGO (JP)
TAJIMA AKIO (JP)
International Classes:
H04L12/44; H04B10/02; H04J3/00
Foreign References:
JPH10233734A1998-09-02
JP2007158943A2007-06-21
JPH0856201A1996-02-27
JPH1079708A1998-03-24
JP2009213039A2009-09-17
Other References:
FUJIWARA, M. ET AL.: "Impact of Backreflection on Upstream Transmission in WDM Single-Fiber Loopback Access Networks", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 24, no. 2, February 2006 (2006-02-01), pages 740 - 746
Attorney, Agent or Firm:
KUDOH Minoru (JP)
Minoru Kudo (JP)
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