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Patent Searching and Data


Title:
SPECTRUM MONITORING DEVICE, SUBMARINE APPARATUS, AND OPTICAL COMMUNICATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2021/177414
Kind Code:
A1
Abstract:
A variable light band-pass filter (13) allows passage of a signal light having a designated wavelength band among signal lights that include reference signal lights (R1, R2). A light-receiving unit (14) outputs a level signal (S1) that indicates the level of the signal light having passed through the variable light band-pass filter (13). A control unit (15): refers to a wavelength table (15A) that is held in advance; indicates, to the variable light band-pass filter (13), a wavelength band to be allowed passage; and acquires, using the wavelength table (15A) and the level signal (S1), the spectrum of the signal light that has passed through the variable light band-pass filter (13). The control unit (15) detects wavelength drift between the center wavelength of the wavelength band indicated to the variable light band-pass filter (13) in order to allow passage of the reference signal lights (R1, R2) and the center wavelength of the peak corresponding to the reference signal lights (R1, R2) in the spectrum, updates the wavelength table (15A), and corrects the detected wavelength drift.

Inventors:
KAWAI MOTOYOSHI (JP)
Application Number:
PCT/JP2021/008496
Publication Date:
September 10, 2021
Filing Date:
March 04, 2021
Export Citation:
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Assignee:
NEC CORP (JP)
International Classes:
H04B10/075
Domestic Patent References:
WO2017033438A12017-03-02
Foreign References:
JP2011254309A2011-12-15
JP2011077808A2011-04-14
Attorney, Agent or Firm:
IEIRI Takeshi (JP)
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