MX9710397A - Control de predistorsion adaptable para modulacion optica. - Google Patents

Control de predistorsion adaptable para modulacion optica.

Info

Publication number
MX9710397A
MX9710397A MX9710397A MX9710397A MX9710397A MX 9710397 A MX9710397 A MX 9710397A MX 9710397 A MX9710397 A MX 9710397A MX 9710397 A MX9710397 A MX 9710397A MX 9710397 A MX9710397 A MX 9710397A
Authority
MX
Mexico
Prior art keywords
signal
distortion
predistortion control
response
control signal
Prior art date
Application number
MX9710397A
Other languages
English (en)
Other versions
MXPA97010397A (es
Inventor
Rezin E Pidgeon
Original Assignee
Scientific Atlanta
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 Scientific Atlanta filed Critical Scientific Atlanta
Publication of MX9710397A publication Critical patent/MX9710397A/es
Publication of MXPA97010397A publication Critical patent/MXPA97010397A/es

Links

Classifications

    • 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
    • H04B10/5051—Laser transmitters using external modulation using a series, i.e. cascade, combination of modulators
    • 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
    • H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
    • H04B10/50572—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the modulating signal amplitude including amplitude distortion
    • 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
    • H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
    • H04B10/50575—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the modulator DC bias
    • 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
    • H04B10/5059—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input
    • H04B10/50593—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input to control the modulating signal amplitude including amplitude distortion
    • 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
    • H04B10/5059—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input
    • H04B10/50595—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input to control the modulator DC bias
    • 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
    • H04B10/58—Compensation for non-linear transmitter output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/25—Distortion or dispersion compensation
    • H04B2210/254—Distortion or dispersion compensation before the transmission line, i.e. pre-compensation

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Optical Communication System (AREA)

Abstract

Un circuito transmisor de fibra optica de modulacion externa incluye una fuente optica, un predistorsionador para generar la señal de cancelacion de distorsion en respuesta a la entrada de radiofrecuencia, un modulador electo-optico para modular la señal optica en respuesta a la señal de cancelacion de distorsion y, un circuito de control de predistorsion adaptable para proporcionar una señal de control de predistorsion al predistorsionador. El circuito de control de predistorsion adaptable incluye un receptor para recibir la salida de señaloptica por medio del modulador, un filtro para filtrar la distorsion de intermodulacion desde la señal optica modulada para obtener un primer componente de distorsion, un generador de distorsion para recibir la señal de entrada de radiofrecuencia desde el predistorsionador y generar un segundo componente de distorsion en respuesta a la señal de entrada de radiofrecuencia; un mezclador para desmodular sincronicamente un producto del primero y segundo componentes de distorsion para obtener una señal de correccion; y un filtro de pasabajos y un integrador para generar la señal de control de predistorsion en respuesta a la distorsion de intermodulacion residual en al salida del modulador electo-optico. El predistorsionador modifica la señal de cancelacion de distorsion en respuesta a la señal de control de predistorsion, reduciendo de esta manera la distorsion de la señal optica modulada. De manera similar un método de control de predistorsion adaptable para la modulacion externa optica incluye las etapas de generar una señal de control de predistorsion; modular una señal optica que usa la señal de control de predistorsion; transmitir la señal optica modulada; recibir la señal optica modulada; filtrar la señal optica modulada para obtener un primer componente de distorsion; generar un segundo componente de distorsion que usa la señal de control de predistorsion; desmodular sincronicamente un producto del primer y segundo componentes de distorsion para obtener una señal de correccion de segundo orden y una señal de correccion de tercer orden; integrar la señal de correccion de segundo orden para generar una señal de control de desviacion de modulador; e integrar la señal de correccion de tercer orden para controlar los parámetros del predistorsionador, modificando de esta manera la señal de control de desviacion del modulador para reducir la distorsion de la señal optica modulada.
MXPA/A/1997/010397A 1996-12-18 1997-12-18 Control de predistorsion adaptable para modulacion optica MXPA97010397A (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08769692 1996-12-18
US08/769,692 US5850305A (en) 1996-12-18 1996-12-18 Adaptive predistortion control for optical external modulation

Publications (2)

Publication Number Publication Date
MX9710397A true MX9710397A (es) 1998-08-30
MXPA97010397A MXPA97010397A (es) 1998-11-12

Family

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Also Published As

Publication number Publication date
DE69732562D1 (de) 2005-03-31
DE69732562T2 (de) 2006-04-13
EP0849897A3 (en) 2003-12-10
US5850305A (en) 1998-12-15
EP0849897A2 (en) 1998-06-24
EP0849897B1 (en) 2005-02-23
CA2222973A1 (en) 1998-06-18

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