CA2024352A1 - Distributed amplification for lightwave transmission system - Google Patents

Distributed amplification for lightwave transmission system

Info

Publication number
CA2024352A1
CA2024352A1 CA2024352A CA2024352A CA2024352A1 CA 2024352 A1 CA2024352 A1 CA 2024352A1 CA 2024352 A CA2024352 A CA 2024352A CA 2024352 A CA2024352 A CA 2024352A CA 2024352 A1 CA2024352 A1 CA 2024352A1
Authority
CA
Canada
Prior art keywords
amplification
fiber
rare
distributed amplification
optical fiber
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA2024352A
Other languages
French (fr)
Other versions
CA2024352C (en
Inventor
Linn F. Mollenauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SubCom LLC
Original Assignee
American Telephone and Telegraph Co Inc
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 American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of CA2024352A1 publication Critical patent/CA2024352A1/en
Application granted granted Critical
Publication of CA2024352C publication Critical patent/CA2024352C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
    • H04B10/2916—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using Raman or Brillouin amplifiers
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/2933—Signal power control considering the whole optical path
    • H04B10/2935—Signal power control considering the whole optical path with a cascade of amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06745—Tapering of the fibre, core or active region
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
    • H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre

Abstract

DISTRIBUTED AMPLIFICATION FOR
LIGHTWAVE TRANSMISSION SYSTEM
Abstract Bidirectional lightwave transmission is restored uniform amplification of lightwave signals over long spans of optical fiber is achieved by employing distributed amplification over spans. Distributed amplification is achieved with an amplifying optical fiber which includes a long length of optical fiber having a dilute rare-earth dopant concentration substantially in the fiber core region, and a corresponding pump signal generator at at least one end of the doped fiber having the appropriate wavelength and power to cause amplification of optical signals by both Raman effects and stimulated emission from the rare-earth dopants.
Dilute concentrations are understood as the range of concentrations substantially satisfying the condition that the gain from the rare-earth dopant, when near saturation, is substantially equal to the fiber loss.
CA002024352A 1989-10-06 1990-08-30 Distributed amplification for lightwave transmission system Expired - Lifetime CA2024352C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/418,000 US5058974A (en) 1989-10-06 1989-10-06 Distributed amplification for lightwave transmission system
US418,000 1989-10-06

Publications (2)

Publication Number Publication Date
CA2024352A1 true CA2024352A1 (en) 1991-04-07
CA2024352C CA2024352C (en) 1993-06-08

Family

ID=23656247

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002024352A Expired - Lifetime CA2024352C (en) 1989-10-06 1990-08-30 Distributed amplification for lightwave transmission system

Country Status (5)

Country Link
US (1) US5058974A (en)
EP (1) EP0421675B1 (en)
JP (1) JP2617612B2 (en)
CA (1) CA2024352C (en)
DE (1) DE69028469T2 (en)

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Also Published As

Publication number Publication date
EP0421675A3 (en) 1992-03-18
DE69028469D1 (en) 1996-10-17
EP0421675A2 (en) 1991-04-10
US5058974A (en) 1991-10-22
EP0421675B1 (en) 1996-09-11
DE69028469T2 (en) 1997-04-03
JP2617612B2 (en) 1997-06-04
CA2024352C (en) 1993-06-08
JPH03139617A (en) 1991-06-13

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