Title:
OPTICAL RECEIVER AND OPTICAL TRANSMISSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2012/004890
Kind Code:
A1
Abstract:
An optical receiver (300) uses two optical delay detectors (223) (which have been set such that the delay times T are equal to symbol time and the phase differences are zero and 90 degrees) to receive an optical multilevel signal (215), and the output signals are A/D converted, thereafter subjected to retiming processes, and then subjected to a differential phase detection, thereby detecting a differential phase at a symbol center time point. In the receiver, the detected differential phase is integrated for each symbol and thereafter combined with an amplitude component obtained from a separately disposed optical intensity receiver, thereby reproducing an optical electric field. Thereafter, a wavelength dispersion compensation circuit (231) of a time interval T is used to compensate for the wavelength dispersion of the transmission path. Moreover, an electric or optical Nyquist filter may be inserted to perform a band limitation, thereby enhancing the wavelength dispersion compensation effect.
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Inventors:
KIKUCHI NOBUHIKO (JP)
Application Number:
PCT/JP2010/061704
Publication Date:
January 12, 2012
Filing Date:
July 09, 2010
Export Citation:
Assignee:
HITACHI LTD (JP)
KIKUCHI NOBUHIKO (JP)
KIKUCHI NOBUHIKO (JP)
International Classes:
H04B10/61; H04B10/67; H04B10/69; H04L27/01
Domestic Patent References:
| WO2010061784A1 | 2010-06-03 | |||
| WO2009060920A1 | 2009-05-14 | |||
| WO2008038337A1 | 2008-04-03 | |||
| WO2007132503A1 | 2007-11-22 | |||
| WO2009060920A1 | 2009-05-14 | |||
| WO2007132503A1 | 2007-11-22 |
Other References:
NOBUHIKO KIKUCHI ET AL.: "Direct- Detection Optical Multilevel Signaling with Phase Pre-integration and Pre-distortion", PROCEEDINGS OF THE 2009 IEICE GENERAL CONFERENCE, THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS, 4 March 2009 (2009-03-04), pages 372, XP008170474
R. A. GRIFFIN: "10Gb/s Optical Differential Quadrature Phase Shift Key (DQPSK) Transmission using GaAs/AlGaAs Integration", OFC2002
N. KIKUCHI; K. MANDAI; K. SEKINE; S. SASAKI: "First experimental demonstration of single-polarization 50-Gbit/s 32-level (QASK and 8-DPSK) incoherent optical multilevel transmission", PROC. OPTICAL FIBER COMMUNICATION CONF. (OFC/NFOEC, March 2007 (2007-03-01)
J. HONGOU; K. KASAI; M. YOSHIDA; M. NAKAZAWA: "1 Gsymbol/s, 64 QAM Coherent Optical Transmission over 150 km with a Spectral Efficiency of 3 Bit/s/Hz", PROC. OPTICAL FIBER COMMUNICATION CONF. (OFC/NFOFEC, March 2007 (2007-03-01)
M. G. TAYLOR: "Coherent detection method using DSP to demodulate signal and for subsequent equalization of propagation impairments", ECOC 2003, 2003
R. A. GRIFFIN: "10Gb/s Optical Differential Quadrature Phase Shift Key (DQPSK) Transmission using GaAs/AlGaAs Integration", OFC2002
N. KIKUCHI; K. MANDAI; K. SEKINE; S. SASAKI: "First experimental demonstration of single-polarization 50-Gbit/s 32-level (QASK and 8-DPSK) incoherent optical multilevel transmission", PROC. OPTICAL FIBER COMMUNICATION CONF. (OFC/NFOEC, March 2007 (2007-03-01)
J. HONGOU; K. KASAI; M. YOSHIDA; M. NAKAZAWA: "1 Gsymbol/s, 64 QAM Coherent Optical Transmission over 150 km with a Spectral Efficiency of 3 Bit/s/Hz", PROC. OPTICAL FIBER COMMUNICATION CONF. (OFC/NFOFEC, March 2007 (2007-03-01)
M. G. TAYLOR: "Coherent detection method using DSP to demodulate signal and for subsequent equalization of propagation impairments", ECOC 2003, 2003
Attorney, Agent or Firm:
HASHIZUME, TAKESHI (JP)
Ken Hashizume (JP)
Ken Hashizume (JP)
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