JP2021136475A - 光通信装置及び補正方法 - Google Patents
光通信装置及び補正方法 Download PDFInfo
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- JP2021136475A JP2021136475A JP2020028851A JP2020028851A JP2021136475A JP 2021136475 A JP2021136475 A JP 2021136475A JP 2020028851 A JP2020028851 A JP 2020028851A JP 2020028851 A JP2020028851 A JP 2020028851A JP 2021136475 A JP2021136475 A JP 2021136475A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M3/00—Conversion of analogue values to or from differential modulation
- H03M3/30—Delta-sigma modulation
- H03M3/50—Digital/analogue converters using delta-sigma modulation as an intermediate step
- H03M3/502—Details of the final digital/analogue conversion following the digital delta-sigma modulation
- H03M3/504—Details of the final digital/analogue conversion following the digital delta-sigma modulation the final digital/analogue converter being constituted by a finite impulse response [FIR] filter, i.e. FIRDAC
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0294—Variable filters; Programmable filters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/06—Non-recursive filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/06—Non-recursive filters
- H03H17/0614—Non-recursive filters using Delta-modulation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/74—Simultaneous conversion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/25133—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion including a lumped electrical or optical dispersion compensator
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/524—Pulse modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6161—Compensation of chromatic dispersion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0294—Variable filters; Programmable filters
- H03H2017/0295—Changing between two filter characteristics
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Optical Communication System (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
2B、2B1、2B2、2B3 送信回路
3B、3B1,3B2 受信回路
22 第1のEQL
23 第1のDAC
24 第1のDRV
25 光変調部
25A EML
25B DML
32 光復調部
33 第2のADC
34 第2のEQL
50 第1のFIRフィルタ
50A 第2のFIRフィルタ
50C 第3のFIRフィルタ
50D 第4のFIRフィルタ
51 乗算器
71 検出部
71A 第1の検出部
71B 第2の検出部
71C 第3の検出部
72 補正部
72A 第1の補正部
72B 第2の補正部
72C 第3の補正部
72D 第4の補正部
Claims (8)
- 多値振幅変調方式の入力信号から多値レベルの変化を識別するレベル情報を検出する検出部と、
複数の乗算器のタップ係数に応じて前記入力信号の信号帯域を補償するFIRフィルタと、
前記検出部にて検出された前記レベル情報に基づき、前記FIRフィルタ内の各乗算器のタップ係数を補正する補正部と
を有することを特徴とする光通信装置。 - 前記FIRフィルタの出力信号をアナログ変換するアナログ変換部と、
前記アナログ変換後の前記出力信号に応じて駆動信号を出力する駆動部と、
前記駆動部の駆動信号に応じて前記出力信号を光変換する光変調部と
を有し、
前記補正部は、
前記アナログ変換部、前記駆動部及び前記光変調部の非線形の静特性を補償するように、前記FIRフィルタ内の各乗算器のタップ係数を補正することを特徴とする請求項1に記載の光通信装置。 - 前記光変調部はEML(Electro-absorption Modulation Laser)とし、
前記補正部は、
前記EMLのバイアス電圧対チャープ特性で発生する伝送歪を補償するように、前記FIRフィルタの各乗算器のタップ係数を補正することを特徴とする請求項2に記載の光通信装置。 - 前記光変調部はDML(Directly Modulated Laser)とし、
前記補正部は、
前記DMLの入力電流対遅延特性で発生するレベル間スキューを補償するように、前記FIRフィルタの各乗算器のタップ係数を補正することを特徴とする請求項2に記載の光通信装置。 - 前記検出部は、
前記入力信号の多値レベルの変化推移を示す信号論理を識別する前記レベル情報を検出することを特徴とする請求項1〜4の何れか一つに記載の光通信装置。 - 前記検出部は、
前記入力信号の多値レベルの変化で到達したレベルを識別する前記レベル情報を検出することを特徴とする請求項1〜4の何れか一つに記載の光通信装置。 - 前記多値振幅変調方式の入力信号を光電変換する光復調部と、
前記光復調部で電気変換後の入力信号をデジタル変換するデジタル変換部と
を有し、
前記補正部は、
前記光復調部及び前記デジタル変換部の非線形の静特性を補償するように、前記デジタル変換部からの前記デジタル変換後の前記入力信号の信号帯域を補償する前記FIRフィルタ内の各乗算器のタップ係数を補正することを特徴とする請求項1に記載の光通信装置。 - 光通信装置が、
多値振幅変調方式の入力信号から多値レベルの変化を識別するレベル情報を検出し、
FIRフィルタ内の複数の乗算器のタップ係数に応じて前記入力信号の信号帯域を補償し、
検出された前記レベル情報に基づき、前記FIRフィルタ内の各乗算器のタップ係数を補正する
処理を実行することを特徴とする補正方法。
Priority Applications (3)
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JP2020028851A JP7367557B2 (ja) | 2020-02-21 | 2020-02-21 | 光通信装置及び補正方法 |
CN202110126145.6A CN113381814A (zh) | 2020-02-21 | 2021-01-29 | 光通信设备和校正方法 |
US17/163,900 US11405049B2 (en) | 2020-02-21 | 2021-02-01 | Optical communication apparatus and correcting method |
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JP2020028851A JP7367557B2 (ja) | 2020-02-21 | 2020-02-21 | 光通信装置及び補正方法 |
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JP2021136475A true JP2021136475A (ja) | 2021-09-13 |
JP7367557B2 JP7367557B2 (ja) | 2023-10-24 |
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US (1) | US11405049B2 (ja) |
JP (1) | JP7367557B2 (ja) |
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WO2023215157A1 (en) * | 2022-05-05 | 2023-11-09 | Arris Enterprises Llc | Improved signal sensitivity for an optical line terminal |
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WO2007046370A1 (ja) * | 2005-10-17 | 2007-04-26 | Hitachi Kokusai Electric Inc. | 非線形歪検出方法及び歪補償増幅装置 |
JP5205182B2 (ja) * | 2008-09-09 | 2013-06-05 | 株式会社日立国際電気 | 歪補償増幅装置 |
US20100142956A1 (en) * | 2008-12-08 | 2010-06-10 | Tellabs Operation, Inc. | Method and Apparatus for Reshaping a Channel Signal |
JP6502663B2 (ja) | 2014-12-24 | 2019-04-17 | 日本オクラロ株式会社 | 光通信装置 |
US9735883B2 (en) | 2015-10-09 | 2017-08-15 | Huawei Technologies Co., Ltd. | Intensity modulated direct detection optical transceiver |
WO2017216841A1 (ja) | 2016-06-13 | 2017-12-21 | 株式会社日立製作所 | 光通信モジュール |
US10009195B2 (en) | 2016-06-16 | 2018-06-26 | Finisar Corporation | Nonlinear equalizer |
US10020886B2 (en) | 2016-10-17 | 2018-07-10 | Panduit Corp. | Methods and systems for fiber optic communication |
CN106877820B (zh) * | 2017-01-12 | 2020-08-11 | 广州市迪声音响有限公司 | 一种动态改变均衡增益的均衡系统和方法 |
JP6886114B2 (ja) | 2018-01-11 | 2021-06-16 | 日本電信電話株式会社 | 光伝送システム、光送信装置および光受信装置 |
US10547387B2 (en) | 2018-03-30 | 2020-01-28 | Mellanox Technologies Denmark ApS. | Transition based feedforward equalization method and apparatus implemented with lookup table circuits |
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- 2020-02-21 JP JP2020028851A patent/JP7367557B2/ja active Active
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- 2021-01-29 CN CN202110126145.6A patent/CN113381814A/zh active Pending
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CN113381814A (zh) | 2021-09-10 |
US11405049B2 (en) | 2022-08-02 |
JP7367557B2 (ja) | 2023-10-24 |
US20210266009A1 (en) | 2021-08-26 |
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