Title:
WAVELENGTH DISPERSION ESTIMATION CIRCUIT, OPTICAL RECEIVER, AND WAVELENGTH DISPERSION ESTIMATION METHOD
Document Type and Number:
WIPO Patent Application WO/2017/077802
Kind Code:
A1
Abstract:
In the present invention, a Fourier transform unit (11) performs Fourier transform on a filter coefficient output from an adaptive equalization unit (6) that is constituted by a finite impulse response filter of N taps (N is an integer of 2 or more) in a time direction. An eigenvalue sum calculation unit (15) integrates the result of differentiating the Fourier-transformed filter coefficient by a frequency with a complex conjugate of the Fourier-transformed filter coefficient to calculate a matrix, and then calculates the sum of two eigenvalues of the matrix. A proportionality coefficient calculation unit (14) calculates a proportionality coefficient relative to the frequency from the sum of the two eigenvalues.
Inventors:
YAMAZAKI ETSUSHI (JP)
TAKAMUKU TOMOHIRO (JP)
YOSHIDA YUKI (JP)
YOSHIDA MITSUTERU (JP)
SHIBAHARA KOKI (JP)
HORIKOSHI KENGO (JP)
KISAKA YOSHIAKI (JP)
TAKAMUKU TOMOHIRO (JP)
YOSHIDA YUKI (JP)
YOSHIDA MITSUTERU (JP)
SHIBAHARA KOKI (JP)
HORIKOSHI KENGO (JP)
KISAKA YOSHIAKI (JP)
Application Number:
PCT/JP2016/079538
Publication Date:
May 11, 2017
Filing Date:
October 04, 2016
Export Citation:
Assignee:
NTT ELECTRONICS CORP (JP)
NIPPON TELEGRAPH & TELEPHONE (JP)
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04B10/079; G01M11/02; H04B3/06; H04B10/2513
Foreign References:
| JP2014233039A | 2014-12-11 |
Other References:
J.C.GEYER ET AL.: "Performance Monitoring Using Coherent Receivers", OFC/NFOEC 2009, vol. 03, 2009, pages 1 - 2, XP031467792
G.BOSCO ET AL.: "Joint DGD, PDL and Chromatic Dispersion Estimation in Ultra-Long-Haul WDM Transmission Experiments with Coherent Receivers", ECOC 2010, September 2010 (2010-09-01), pages 1 - 2, XP031789805
G.BOSCO ET AL.: "Joint DGD, PDL and Chromatic Dispersion Estimation in Ultra-Long-Haul WDM Transmission Experiments with Coherent Receivers", ECOC 2010, September 2010 (2010-09-01), pages 1 - 2, XP031789805
Attorney, Agent or Firm:
TAKADA, Mamoru et al. (JP)
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