Title:
光送受信システム
Document Type and Number:
Japanese Patent JP6767310
Kind Code:
B2
Abstract:
To accurately calculate an optimum value.SOLUTION: A frequency modulation light signal is received so that electric signals of an in-phase component and a quadrature component are outputted by subjecting the frequency modulation light signal to homodyne detection based on local oscillation light. The electric signals of the in-phase component and the quadrature component are each sampled so that they are converted into digital sampling signals of the in-phase component and the quadrature component. The sampling signals of the in-phase component and the quadrature component are subjected to differential detection. Then, a phase average value is calculated on the basis of a fixed pattern having a uniform or substantially uniform occurrence frequency of signal points included in the signals obtained by the differential detection. Based on the phase average value, the phases of the sampling signals of the in-phase component and the quadrature component are reversed.SELECTED DRAWING: Figure 4
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Inventors:
Masamitsu Fujiwara
Ryo Kuruma
Ryo Kuruma
Application Number:
JP2017104735A
Publication Date:
October 14, 2020
Filing Date:
May 26, 2017
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H04B10/61; H04L27/10; H04L27/12; H04L27/14; H04L27/36; H04L27/38
Domestic Patent References:
| JP2011199657A | ||||
| JP321126A | ||||
| JP522354A |
Other References:
Y. Nakanishi et al.,Novel Optical Quaternary Minimum Shift Keying Technology with Direct Modulation of Conventional DFB Laser and Digital Coherent Detection,IEEE Photonics Conference 2012,2012年,pp. 238-239
Attorney, Agent or Firm:
Shiga International Patent Office