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Title:
OPTICAL TRANSPORTING APPARATUS, OPTICAL TRANSMISSION SYSTEM, OPTICAL TRANSPORTING METHOD, AND OPTICAL TRANSMISSION METHOD
Document Type and Number:
WIPO Patent Application WO/2006/051849
Kind Code:
A1
Abstract:
In an optical transmission system using a frequency division multiplex scheme, the interference of the distortion component of a first signal with a second signal is reduced. In the optical transmission system where an optical signal, which has been modulated with the first signal, is further modulated with the second signal for transmission, the distortion component of the first signal corresponding to the frequency band of the second signal is extracted. The phase of the extracted signal is inverted, whereby the distortion component of the first signal is adjusted in phase and amplitude to obtain a correction signal. This correction signal can be used to intensity modulate the first signal including the distortion component, thereby canceling the distortion component of the first signal with respect to the second signal. Alternatively, a signal obtained by combining the correction signal with the second signal may be used to intensity modulate the first signal including the distortion component, thereby canceling the distortion component of the first signal with respect to the second signal.

Inventors:
KIKUSHIMA KOJI (JP)
IKEDA SATOSHI (JP)
Application Number:
PCT/JP2005/020597
Publication Date:
May 18, 2006
Filing Date:
November 10, 2005
Export Citation:
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Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
KIKUSHIMA KOJI (JP)
IKEDA SATOSHI (JP)
International Classes:
H04B10/54; H04B10/2507; H04B10/548; H04B10/58; H04B14/00; H04J14/00; H04J14/02; H04N7/20; H04N7/22; H04N21/647
Foreign References:
JPH10511186A1998-10-27
JPH0865247A1996-03-08
JP2003524313A2003-08-12
JP2001051243A2001-02-23
Other References:
See also references of EP 1811692A4
None
Attorney, Agent or Firm:
Tani, Yoshikazu (Akasaka 2-chome Minato-k, Tokyo 52, JP)
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