Title:
OPTICAL RECEIVER AND OPTICAL RECEPTION METHOD
Document Type and Number:
WIPO Patent Application WO/2015/025520
Kind Code:
A1
Abstract:
In order to reduce a delay at the time of detecting inputted optical signals in an optical receiver using a variable optical attenuator, this optical receiver includes: a variable optical attenuator that outputs optical signals by attenuating the intensity of inputted optical signals; a photoelectric converter that converts the optical signals into electric signals; an amplitude detection circuit that outputs an output voltage on the basis of the amplitude of the electric signals; an optical attenuator control circuit that outputs signals for controlling an attenuation quantity of the variable optical attenuator on the basis of the output voltage; a signal detection circuit that outputs signal detection output by comparing the output voltage and a signal detection threshold voltage, i.e., reference of signal detection, to each other; and a threshold control circuit, which monitors the output voltage, and which changes the signal detection threshold voltage when an output voltage change state becomes stable with time.
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Inventors:
KOMATSU HIROKAZU (JP)
Application Number:
PCT/JP2014/004258
Publication Date:
February 26, 2015
Filing Date:
August 20, 2014
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H04B10/69; H01L31/10
Foreign References:
| JP2008245118A | 2008-10-09 | |||
| JP2004153758A | 2004-05-27 |
Attorney, Agent or Firm:
SHIMOSAKA, NAOKI (JP)
Naoki Shimosaka (JP)
Naoki Shimosaka (JP)
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