Title:
受信光信号のクロスポイント検出回路およびそれを用いた光受信装置
Document Type and Number:
Japanese Patent JP5456094
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a cross-point detection circuit for easily detecting a cross-point of a receiving optical signal, and to provide an optical receiving apparatus for optimum control of an electrical waveform equalizing circuit and an optical variable dispersion compensating circuit of the optical receiving apparatus using a detected cross-point value.SOLUTION: Bias voltage is superimposed to a signal in which a DC element is cut off through AC coupling of an electrical signal photoelectrically converted from a receiving optical signal. The signal to which the bias voltage is superimposed is amplified with an automatic gain control amplifying circuit to detect an average voltage of an output signal of the circuit. Moreover, a tap coefficient of an electrical waveform equalizing circuit is optimum-controlled using the detected average voltage value.
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Inventors:
Kazushige Nagashima
Suzuki Kazunori
Takashi Yamamoto
Atsushi Kanda
Makoto Nakamura
Masatoshi Tobayashi
Masahiro Endo
Suzuki Kazunori
Takashi Yamamoto
Atsushi Kanda
Makoto Nakamura
Masatoshi Tobayashi
Masahiro Endo
Application Number:
JP2012102398A
Publication Date:
March 26, 2014
Filing Date:
April 27, 2012
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
NTT Electronics Corporation
NTT Electronics Corporation
International Classes:
H04B10/69; H04B10/2513; H04B10/2525; H04B10/524; H04B10/58; H04B10/66; H04L25/03; H04L25/497
Domestic Patent References:
| JP2002111587A | ||||
| JP2005117464A | ||||
| JP2003198467A | ||||
| JP2005159553A | ||||
| JP2007181048A | ||||
| JP2006094500A |
Attorney, Agent or Firm:
Toshinao Shimodaira
Norimasa Kawamura
Norimasa Kawamura