WO2005004358B1 - Optical duobinary transmitter and method - Google Patents

Optical duobinary transmitter and method

Info

Publication number
WO2005004358B1
WO2005004358B1 PCT/IL2004/000594 IL2004000594W WO2005004358B1 WO 2005004358 B1 WO2005004358 B1 WO 2005004358B1 IL 2004000594 W IL2004000594 W IL 2004000594W WO 2005004358 B1 WO2005004358 B1 WO 2005004358B1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission system
duobinary
mzm
control circuit
precoder
Prior art date
Application number
PCT/IL2004/000594
Other languages
French (fr)
Other versions
WO2005004358A1 (en
Inventor
Motti Caspi
Roni Dadon
Efraim Roif
Original Assignee
Terasea Ltd
Motti Caspi
Roni Dadon
Efraim Roif
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Terasea Ltd, Motti Caspi, Roni Dadon, Efraim Roif filed Critical Terasea Ltd
Publication of WO2005004358A1 publication Critical patent/WO2005004358A1/en
Publication of WO2005004358B1 publication Critical patent/WO2005004358B1/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M5/00—Conversion of the form of the representation of individual digits
    • H03M5/02—Conversion to or from representation by pulses
    • H03M5/04—Conversion to or from representation by pulses the pulses having two levels
    • 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
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • H04B10/5055—Laser transmitters using external modulation using a pre-coder
    • 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
    • H04B10/5167—Duo-binary; Alternative mark inversion; Phase shaped binary transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/497—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems by correlative coding, e.g. partial response coding or echo modulation coding transmitters and receivers for partial response systems
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/225—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference in an optical waveguide structure
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/126—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode push-pull

Abstract

There is provided an optical duobinary (ODB) transmission system, including a duobinary precoder receiving data signals and converting the signals into first and second different digital signals each composed of two level voltages; a duobinary encoder fed by the precoder for converting the digital signals into three level analog signals, and a close loop control circuit for maintaining equal drive voltages for driving a Mach Zehnder Modulator (MZM). A method of encoding NRZ data for optical duobinary (ODB) transmission is also provided.

Claims

[Received by the International Bureau on 9 December 2004 (09/12/04); original claim 1 has been amended]
1. An optical duobinary (ODB) transmission system, comprising: a duobinary precoder receiving a data signal and converting said signal into first and second different digital signals each composed of two level voltages; a duobinary encoder fed by the precoder for converting said digital signal into a three level analog signal, and a close loop control circuit for maintaining equal drive voltages for driving a Mach Zehnder Modulator (MZM), said close loop control circuit being connected between the duobinary encoder and the MZM.
2. The transmission system as claimed in claim 1, wherein said digital precoder comprises an EXOR gate in circuit with a clock.
3. The transmission system as claimed in claim ls wherein said encoder comprises analog switches and identical resistors.
4. The transmission system as claimed in claim lt wherein said control circuit is operationally connected to said encoder via a variable resistor.
5. The transmission system as claimed in claim 1, wherein said MZM is driven by single three-level analog signals for a single output mode.
6. The transmission system as claimed in claim 1, wherein said MZM is driven by two separate three-level analog signals for a differential transmission mode.
7. The transmission system as claimed in claim 6, wherein said close loop control circuit also maintains equal phases for said differential transmission mode,
8. The transmission system as claimed in claim 1, wherein said three voltage levels are OV, Vπ and 2Vπ for a single drive output and OV, Vτs/2 and Vπ for a differential transmission mode.
PCT/IL2004/000594 2003-07-06 2004-07-04 Optical duobinary transmitter and method WO2005004358A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL156788 2003-07-06
IL15678803A IL156788A0 (en) 2003-07-06 2003-07-06 Digital to analog converter for optical communications

Publications (2)

Publication Number Publication Date
WO2005004358A1 WO2005004358A1 (en) 2005-01-13
WO2005004358B1 true WO2005004358B1 (en) 2005-03-24

Family

ID=32652238

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL2004/000594 WO2005004358A1 (en) 2003-07-06 2004-07-04 Optical duobinary transmitter and method

Country Status (2)

Country Link
IL (1) IL156788A0 (en)
WO (1) WO2005004358A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5892858A (en) * 1997-03-27 1999-04-06 Northern Telecom Limited Duobinary coding and modulation technique for optical communication systems
US6388786B1 (en) * 1997-08-15 2002-05-14 Nec Corporation Method for generating duobinary signal and optical transmitter using the same method
JP3723358B2 (en) * 1998-11-25 2005-12-07 富士通株式会社 Optical modulation device and optical modulator control method
US6445476B1 (en) * 2001-01-29 2002-09-03 Stratalight Communications, Inc. Transmission and reception of duobinary multilevel pulse-amplitude-modulated optical signals using subsequence-based encoder

Also Published As

Publication number Publication date
WO2005004358A1 (en) 2005-01-13
IL156788A0 (en) 2004-02-08

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