Title:
DIGITAL SIGNAL PROCESSING CIRCUIT, METHOD, RECEIVER, AND COMMUNICATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/073927
Kind Code:
A1
Abstract:
The present invention makes it possible to accurately compensate for intra-transmitter distortion. A wavelength dispersion compensation filter (31) multiplies each of a real component and an imaginary component of each of a first polarization and a second polarization of a polarization multiplexed optical signal by a filter coefficient for compensating for wavelength dispersion. An adaptive equalizer (32) multiplies an input signal and its phase conjugation by a complex impulse response and adds together signals multiplied by the complex impulse response. The adaptive equalizer (32): applies, to each polarization, a phase rotation for carrier phase compensation including a frequency offset and the inverse rotation of the phase rotation; and adds together, for each polarization, a signal to which the phase rotation is applied and a signal to which the inverse rotation of the phase rotation is applied.
Inventors:
SATO MASAKI (JP)
ARIKAWA MANABU (JP)
ARIKAWA MANABU (JP)
Application Number:
PCT/JP2021/040033
Publication Date:
May 04, 2023
Filing Date:
October 29, 2021
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H04B10/61; H04J14/06
Foreign References:
| JP2020141294A | 2020-09-03 | |||
| JP2018152744A | 2018-09-27 |
Other References:
DA SILVA EDSON PORTO; ZIBAR DARKO: "Widely Linear Equalization for IQ Imbalance and Skew Compensation in Optical Coherent Receivers", JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE, USA, vol. 34, no. 15, 1 August 2016 (2016-08-01), USA, pages 3577 - 3586, XP011618649, ISSN: 0733-8724, DOI: 10.1109/JLT.2016.2577716
ARIKAWA MANABU, HAYASHI KAZUNORI: "Transmitter and receiver impairment monitoring using adaptive multi-layer linear and widely linear filter coefficients controlled by stochastic gradient descent", OPTICS EXPRESS, vol. 29, no. 8, 12 April 2021 (2021-04-12), pages 11548 - 11561, XP093059335, DOI: 10.1364/OE.416992
ARIKAWA MANABU, HAYASHI KAZUNORI: "Transmitter and receiver impairment monitoring using adaptive multi-layer linear and widely linear filter coefficients controlled by stochastic gradient descent", OPTICS EXPRESS, vol. 29, no. 8, 12 April 2021 (2021-04-12), pages 11548 - 11561, XP093059335, DOI: 10.1364/OE.416992
Attorney, Agent or Firm:
IEIRI Takeshi (JP)
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