Optical communications – Transmitter and receiver system – Including optical waveguide
Reexamination Certificate
2011-01-11
2011-01-11
Tran, Dzung D (Department: 2613)
Optical communications
Transmitter and receiver system
Including optical waveguide
C398S149000, C398S209000
Reexamination Certificate
active
07869715
ABSTRACT:
A variable dispersion compensating unit compensates an optical signal, and changes the compensation amount according to a control signal that has a given frequency. After demodulation of the compensated optical signal, error conditions of the signal are monitored and an error signal is output. A band pass filter filters the error signal for a component having a frequency equal to or less than the given frequency. Based on the component and on the control signal, a synchronous detecting circuit generates a compensation amount modification signal. The compensation amount modification signal is superposed on the control signal.
REFERENCES:
patent: 6411416 (2002-06-01), Ooi et al.
patent: 6580542 (2003-06-01), Song et al.
patent: 6871024 (2005-03-01), Nishimoto et al.
patent: 2004/0081393 (2004-04-01), Singh et al.
patent: 2004/0141756 (2004-07-01), Nakamura et al.
patent: 2004/0161243 (2004-08-01), Ooi et al.
patent: 2004/0190911 (2004-09-01), Franco et al.
patent: 2004/0213578 (2004-10-01), Takahara et al.
patent: 2005/0226613 (2005-10-01), Raddatz
patent: 1209006 (1999-02-01), None
patent: 0 812 075 (1997-12-01), None
patent: 1 030 472 (2000-08-01), None
patent: 1 223 694 (2002-07-01), None
patent: 1 443 689 (2004-08-01), None
patent: 1 580 906 (2005-09-01), None
patent: 2002-208892 (2002-07-01), None
Extended European Search Report, issued in corresponding European Patent Application No. 07008669.9 on Nov. 30, 2007.
Office Action issued May 23, 2008 in corresponding European Patent Application No. 07008669.9.
Grant Nicholson et al., “Polarization Fluctuation Measurements on Installed Single-Mode Optical Filber Cables” Journal of Lightwave Technology vol. 7 No. 8 p. 1197-1200, Aug. 1989.
D.L. Peterson Jr. et al., “Field measurements of state of polarization and PMD from a tier-1 carrier” FI1, Feb. 2004.
P.M. Krummrich and K. Kotten, “Extremely fast (microsecond timescale) polarization changes in high speed long haul WDM transmission systems” F13, 2004.
Hiroki Ooi et al., “40-Gbit/s WDM Automatic Dispersion Compensation with Virtually Imaged Phased Array (VIPA) Variable Dispersion Compensators” IEICE Transactions on Communications vol. E85-B No. 2 p. 463-469, Feb. 2002.
Sadayuki Matsumoto et al., “Tunable Dispersion Equalizer with a Divided Thin-Film Heater for 40-Gb/s RZ Transmissions” IEEE Photonics Technology Letters, vol. 13 No. 8 p. 827-829, Aug. 2001.
Chinese Office Action issued Aug. 27, 2010 in corresponding Chinese patent application No. 200710107461.9.
Hoshida Takeshi
Onaka Hiroshi
Ooi Hiroki
Fujitsu Limited
Staas & Halsey , LLP
Tran Dzung D
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