Title:
OPTICAL TRANSMITTER AND OPTICAL OFDM COMMUNICATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2010/073990
Kind Code:
A1
Abstract:
Distortion of a reception signal which is attributable to interference between subcarriers during photoelectric conversion is reduced in an optical OFDM communication system without broadening the signal band. A transmission signal processing unit (100) in a transmitter is provided with a distortion generating circuit (distortion generating unit) (170). A subcarrier signal is utilized as an input signal for the circuit. The distortion generating circuit (170) generates a baseband OFDM signal by means of inverse FFT calculation using the input signal, computes the square of the absolute value of the signal, and restores the subcarrier signal by means of FFT calculation. Because interference between subcarriers is also included in the signal, the distortion element generated by the interference between the subcarriers can be extracted when the difference from the input signal is found. The signal obtained by subtracting the distortion element from the subcarrier signal, which has been modulated using the original data to be communicated, is used as the transmission signal. The transmission signal is photoelectrically converted with a receiver. The interference between subcarriers generated at this time is smaller than when the aforementioned processing is not performed.
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Inventors:
SASAKI SHINYA (JP)
Application Number:
PCT/JP2009/071139
Publication Date:
July 01, 2010
Filing Date:
December 18, 2009
Export Citation:
Assignee:
HITACHI LTD (JP)
SASAKI SHINYA (JP)
SASAKI SHINYA (JP)
International Classes:
H04J14/00; H04B10/516; H04J11/00; H04J14/04; H04J14/06
Foreign References:
| JP2008206064A | 2008-09-04 | |||
| JPH1051416A | 1998-02-20 | |||
| JP2003530729A | 2003-10-14 |
Other References:
WEI-REN PENG ET AL.: "Experimental Demonstration of 340 km SSMF Transmission Using a Virtual Single Sideband OFDM Signal that Employs Carrier Suppressed and Iterative Detection Techniques", OFC/NFOEC 2008, February 2008 (2008-02-01), XP031391514
A. J. LOWERY, L. DU, J. ARMSTRONG: "Orthogonal frequency division multiplexing for adaptive dispersion compensation in long haul WDM systems", OFC2006, 2006
W. PENG, X. WU, V. R. ARBAB ET AL.: "Experimental demonstration of a coherently modulated and directly directed optical OFDM systems using an RF-tone insertion", OFC2008, 2008
W. PENG, X. WU, V. R. ARBAB ET AL.: "Experimental demonstration of 340 km SSMF transmission using a virtual single sideband OFDM signal that employs carrier suppressed and iterative detection techniques", OFC 2008, 2008
A. J. LOWERY, L. DU, J. ARMSTRONG: "Orthogonal frequency division multiplexing for adaptive dispersion compensation in long haul WDM systems", OFC2006, 2006
W. PENG, X. WU, V. R. ARBAB ET AL.: "Experimental demonstration of a coherently modulated and directly directed optical OFDM systems using an RF-tone insertion", OFC2008, 2008
W. PENG, X. WU, V. R. ARBAB ET AL.: "Experimental demonstration of 340 km SSMF transmission using a virtual single sideband OFDM signal that employs carrier suppressed and iterative detection techniques", OFC 2008, 2008
Attorney, Agent or Firm:
HASHIZUME, TAKESHI (JP)
Ken Hashizume (JP)
Ken Hashizume (JP)
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