Title:
OPTICAL SIGNAL RECEPTION DEVICE, OPTICAL SIGNAL RECEPTION METHOD, AND NON-TRANSITORY COMPUTER-READABLE MEDIUM
Document Type and Number:
WIPO Patent Application WO/2019/167361
Kind Code:
A1
Abstract:
The purpose of the present invention is to shorten the duration of a possible abnormal operation of a phase synchronization unit of an optical signal reception device in the event of a fault, and to reduce fluctuation in the frequency of a clock used for decoding a client signal. The optical signal reception device (1) is provided with: a clock extraction unit (1a) for extracting a first clock signal from an optical signal having been input; a clock generation unit (1b) for generating a second clock signal; and a phase-synchronization unit (1c) for receiving input of a clock signal and outputting a phase-synchronized clock signal. The optical signal reception device (1) is further provided with a control unit (1d) for switching the clock signal to be input to the phase synchronization unit (1c) between the first clock signal and the second clock signal on the basis of the light intensity of the optical signal.
Inventors:
TAKAHASHI MORIO (JP)
Application Number:
PCT/JP2018/043364
Publication Date:
September 06, 2019
Filing Date:
November 26, 2018
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H04L7/00; H04J3/00
Domestic Patent References:
| WO2006085356A1 | 2006-08-17 |
Foreign References:
| US7542483B1 | 2009-06-02 | |||
| JP2009290256A | 2009-12-10 | |||
| JPH1155700A | 1999-02-26 | |||
| JP2010206625A | 2010-09-16 | |||
| JPH05344104A | 1993-12-24 |
Attorney, Agent or Firm:
IEIRI Takeshi (JP)
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