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1. WO2002021203 - OPTICAL AMPLIFIER AND OPTICAL COMMUNICATION SYSTEM

Publication Number WO/2002/021203
Publication Date 14.03.2002
International Application No. PCT/JP2000/006101
International Filing Date 07.09.2000
IPC
H01S 3/067 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
063Waveguide lasers, e.g. laser amplifiers
067Fibre lasers
H01S 3/30 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
30using scattering effects, e.g. stimulated Brillouin or Raman effects
H04B 10/077 2013.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
075using an in-service signal
077using a supervisory or additional signal
H04B 10/079 2013.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
075using an in-service signal
079using measurements of the data signal
H04B 10/25 2013.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
25Arrangements specific to fibre transmission
H04B 10/2507 2013.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
25Arrangements specific to fibre transmission
2507for the reduction or elimination of distortion or dispersion
CPC
H01S 2301/02
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
2301Functional characteristics
02ASE (amplified spontaneous emission), noise; Reduction thereof
H01S 3/06758
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
063Waveguide lasers, ; i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
067Fibre lasers
06754Fibre amplifiers
06758Tandem amplifiers
H01S 3/06766
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
063Waveguide lasers, ; i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
067Fibre lasers
06754Fibre amplifiers
06762having a specific amplification band
06766C-band amplifiers, i.e. amplification in the range of about 1530 nm to 1560 nm
H01S 3/0677
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
063Waveguide lasers, ; i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
067Fibre lasers
06754Fibre amplifiers
06762having a specific amplification band
0677L-band amplifiers, i.e. amplification in the range of about 1560 nm to 1610 nm
H01S 3/10015
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
10007in optical amplifiers
10015by monitoring or controlling, e.g. attenuating, the input signal
H01S 3/13013
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13Stabilisation of laser output parameters, e.g. frequency, amplitude
1301in optical amplifiers
13013by controlling the optical pumping
Applicants
  • FUJITSU LIMITED [JP]/[JP] (AllExceptUS)
  • OHSHIMA, Chihiro [JP]/[JP] (UsOnly)
  • SUGAYA, Yasushi [JP]/[JP] (UsOnly)
Inventors
  • OHSHIMA, Chihiro
  • SUGAYA, Yasushi
Agents
  • SASAJIMA, Fujio
Priority Data
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) OPTICAL AMPLIFIER AND OPTICAL COMMUNICATION SYSTEM
(FR) AMPLIFICATEUR OPTIQUE ET SYSTEME DE COMMUNICATION OPTIQUE
Abstract
(EN)
An optical amplifier incorporating a Raman amplifier for outputting a light beam the signal-to-noise ratio of which is prevented from degrading and which has improved transmission characteristics for signal light, comprises first optical amplifying means for Raman-amplifying a signal light by supplying pumping light to a Raman amplifying medium, second optical amplifying means for amplifying the signal light outputted from the first optical amplifying means, control means for controlling the operation of the first or second optical amplifying means so that the signal-to-noise ratio of the signal light outputted from the second optical amplifying means is almost constant. The control means determines the signal-to-noise of the output light outputted from the second amplifying means on the basis of the noise light component due to the Raman amplification calculated from the Raman pumping light power and the signal information on the preceding stage optical amplifier and the noise light component calculated from the power of light inputted to the second optical amplifying means and the signal information on the preceding stage optical amplifier and controls the output preset levels of the first and second optical amplifying means so that the signal-to-noise ratio is almost constant irrespective of the wavelength of the signal light. An optical transmission system is also disclosed.
(FR)
Dans cette invention, un amplificateur optique à amplificateur Raman émettant un faisceau lumineux dans lequel on empêche le rapport signal/bruit de se dégrader et qui présente des caractéristiques de transmission améliorées de signal lumineux, comprend un premier moyen d'amplification optique servant à amplifier par voie Raman un signal lumineux en fournissant de la lumière de pompage à un milieu d'amplification Raman, un second moyen d'amplification optique servant à amplifier le signal lumineux produit par le premier moyen d'amplification optique, un moyen de commande qui agit sur le fonctionnement des premier et second moyens d'amplification optique de sorte que le rapport signal/bruit du signal émis par le second moyen d'amplification optique soit quasiment constant. Ce moyen de commande d'une part détermine le rapport signal/bruit de la lumière de sortie émise par le second moyen d'amplification sur la base de la composante lumière bruit due à l'amplification Raman calculée à partir de la puissance lumineuse de pompage Raman et des informations de signal provenant de l'amplificateur optique de l'étape précédente, et de la composante lumière bruit calculée à partir de la puissance lumineuse injectée dans le second moyen d'amplification optique et des informations de signal de l'amplificateur optique de l'étape précédente, et d'autre part régule les niveaux préréglés de sortie des premier et second moyens d'amplification optique de manière à ce que le rapport signal/bruit soit quasiment constant sans tenir compte de la longueur d'onde du signal lumineux. Par ailleurs, l'invention concerne un système de transmission optique.
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