WO2022201991A1 - 光増幅器 - Google Patents
光増幅器 Download PDFInfo
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- WO2022201991A1 WO2022201991A1 PCT/JP2022/006278 JP2022006278W WO2022201991A1 WO 2022201991 A1 WO2022201991 A1 WO 2022201991A1 JP 2022006278 W JP2022006278 W JP 2022006278W WO 2022201991 A1 WO2022201991 A1 WO 2022201991A1
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- optical
- communication signal
- pumping light
- gain
- coupler
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- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 2
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- 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
- H01S3/06754—Fibre amplifiers
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- 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
- G02F1/29—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 position or the direction of light beams, i.e. deflection
- G02F1/31—Digital deflection, i.e. optical switching
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- 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
- H01S3/0014—Monitoring arrangements not otherwise provided for
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- 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
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
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- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094011—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre with bidirectional pumping, i.e. with injection of the pump light from both two ends of the fibre
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- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
- H01S3/1003—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors tunable optical elements, e.g. acousto-optic filters, tunable gratings
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- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
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- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
- H01S3/13013—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers by controlling the optical pumping
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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
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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
- H04B10/29—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
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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
- H04B10/29—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
- H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
- H04B10/2942—Signal power control in a multiwavelength system, e.g. gain equalisation using automatic gain control [AGC]
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- 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
- H01S2301/00—Functional characteristics
- H01S2301/06—Gain non-linearity, distortion; Compensation thereof
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- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
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- 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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1608—Solid materials characterised by an active (lasing) ion rare earth erbium
Definitions
- the present invention relates to an optical amplifier, and more particularly to an optical amplifier that amplifies an optical signal that has been attenuated in an optical fiber transmission line.
- Patent Document 1 discloses an example of technology related to an optical amplifier.
- the optical amplifier disclosed in Patent Document 1 includes an input port, a bar cross switch optically coupled to the input port, and a first port and an output port of the bar cross switch. and a secondary gain stage optically coupled between the second and third ports of the Barcross switch, the optical amplifier comprising: In the bar state the secondary gain stage is bypassed and in the cross state the secondary gain stage and the first gain stage are applied to the input light beam.
- an input terminal for inputting an optical communication signal, a first pumping light coupler for combining the optical communication signal and pumping light, and an optical amplifier provided downstream of the first pumping light coupler.
- a first optical amplification medium for amplifying an optical communication signal by the pumping light;
- a first optical switch for outputting to either one of a branch path and a second branch path, selecting either one of the first branch path and the second branch path, and transmitting the selected branch path a second optical switch for transmitting the incoming optical communication signal to a subsequent stage; and an output terminal provided after the second optical switch for outputting the optical communication signal.
- a second optical amplification medium for amplifying the optical communication signal with the pumping light, and a branch path provided downstream of the second optical amplification medium and directed to the optical communication signal and the second optical amplification medium.
- a second pumping light coupler for synthesizing the pumping light in the direction; and a first gain equalizer provided after the second pumping light coupler for correcting gain wavelength characteristics;
- 2 branch paths are provided in a third pumping light coupler for combining the optical communication signal and the pumping light in the direction toward the first optical switch, and in a stage subsequent to the third pumping light coupler, and having a gain wavelength of and a second gain equalizer for correcting characteristics.
- optical amplifier of the present invention it is possible to perform wideband gain variable operation with a simple configuration while suppressing the noise figure.
- FIG. 1 is a block diagram of a communication system to which the optical amplifier according to Embodiment 1 is applied;
- FIG. 1 is a block diagram of an optical amplifier according to a first embodiment;
- FIG. 3 is a block diagram illustrating the operation of the optical amplifier according to the first embodiment in a high gain mode;
- FIG. 3 is a block diagram illustrating the operation of the optical amplifier according to the first embodiment in a low gain mode;
- FIG. FIG. 4 is a block diagram of an optical amplifier according to a comparative example;
- FIG. 10 is a block diagram explaining the operation in the high gain mode of the optical amplifier according to the comparative example;
- FIG. 4 is a block diagram for explaining the operation in the low gain mode of the optical amplifier according to the comparative example;
- FIG. 1 shows a block diagram of a communication system 100 to which the optical amplifier according to the first embodiment is applied.
- the communication system 100 connects a transmitter 110 and a receiver 120 via an optical transmission line 130 .
- the transmission device 110 has a transmission signal generator 111 , a multiplexer 112 and a transmission amplifier 113 .
- the transmission device 110 transmits the transmission signal generated by the transmission signal generation section 111 to the transmission amplifier 113 via the multiplexer 112 .
- the transmission amplifier 113 sends an optical communication signal to the optical transmission line 130 with a power of X dBm, for example.
- the receiving device 120 has a receiving amplifier 121 , a demultiplexer 122 and a signal receiving section 123 .
- the receiver 120 transmits the optical communication signal received and amplified by the receiver amplifier 121 to the signal receiver 123 via the demultiplexer 122 .
- the power of the optical communication signal received by the receiving amplifier 121 is assumed to be WdBm.
- a transmission line loss of Y dB occurs in the optical transmission line 130 .
- the optical transmission line 130 or the receiving amplifier 121 is provided with a variable attenuator. This variable attenuator causes a VOA loss of Z dB.
- the value of the power XdBm of the optical communication signal output from the transmission amplifier 113 varies depending on the number of multiplexed wavelengths. Further, when the number of multiplexed wavelengths does not change, the power XdBm of the optical communication signal output from the transmission amplifier 113 is constant, so the VOA loss ZdB is constant regardless of the transmission line loss YdB.
- the transmission path loss YdB is small, the VOA loss ZdB is large, and the signal noise in the receiving amplifier 121 is large although the transmission path loss is small.
- the reception amplifier 121 has a function of amplifying the optical communication signal that has been attenuated in the optical transmission line 130 .
- it is effective to keep the input level of the optical communication signal to the amplifier as high as possible.
- Loss Y dB is not constant and varies with transmission distance.
- optical amplifiers for wavelength multiplexing transmission generally perform constant gain control. Therefore, the gain of the optical amplifier is constant, and in order to eliminate variations in the output of the optical amplifier due to variations in transmission distance, a variable attenuator is provided inside the optical transmission line 130 or the receiving amplifier 121 so that the transmission line loss YdB is If it is small, the attenuation is set large, and if the transmission line loss is large, the attenuation is set small, thereby adjusting the output of the receiving amplifier 121 to a desired optical level.
- this communication system 100 it is possible to set a desired amplifier output while absorbing variations in the transmission line loss Y dB.
- the amount of attenuation to be set is large.
- the input light level to the amplifier decreases even though the transmission path loss is small, and the noise characteristics are degraded. I had a problem.
- an erbium-doped fiber which is an amplification medium, is divided into a plurality of blocks having different gains via an optical switch, and transmission of the applied transmission line is performed.
- the gain can be varied according to the loss of the transmission path.
- the optical amplifier 1 it is possible to realize a variable gain operation capable of coping with variations in the transmission path loss while minimizing deterioration of noise characteristics in a region where the transmission path loss is small. Also, in the optical amplifier 1, by simplifying the overall configuration while reducing the number of EDFs used, improvements in reliability and cost performance are realized.
- the optical amplifier 1 that can be used as the receiving amplifier 121 will be described below.
- FIG. 2 shows a block diagram of the optical amplifier 1 according to the first embodiment. Although not shown in FIG. 2, a variable attenuator may be provided in front of the input terminal of the optical amplifier 1.
- FIG. 2 shows a block diagram of the optical amplifier 1 according to the first embodiment.
- a variable attenuator may be provided in front of the input terminal of the optical amplifier 1.
- the optical amplifier 1 includes a first monitor unit (for example, monitor unit MON1) and a first pumping optical coupler (for example, pumping optical coupler ELC1), a first optical amplification medium (eg, erbium-doped fiber EDF1), a first optical switch (eg, optical switch OSW1), a second optical amplification medium (eg, erbium-doped fiber EDF2), a second 2 pumping light couplers (for example, pumping light coupler ELC2), first gain equalizer (for example, gain equalizer GEQ1), second gain equalizer (for example, gain equalizer GEQ), optical switch (for example, optical switch OSW2), a second monitor unit (for example, monitor unit MON2), a third optical switch (for example, optical switch OSW3), a bifurcation coupler BNC, and an excitation laser diode (for example, excitation LD).
- a first monitor unit for example, monitor unit MON1
- the optical amplifier 1 uses an erbium-doped fiber having a fixed gain as an optical amplification medium.
- An erbium-doped fiber is an erbium-doped fiber doped with the rare earth metal erbium.
- the erbium-doped fiber is then provided with a pump laser that energizes the erbium-doped fiber to create an energy state within the fiber that allows the signal light to be amplified.
- An input terminal is an input port to which an optical communication signal is input from the outside.
- the excitation light coupler ELC1 synthesizes the optical communication signal and the excitation light and transmits them to the subsequent circuit.
- the monitor unit MON1 is provided between the input terminal and the excitation light coupler ELC1.
- the monitor unit MON1 has a photodiode PD1 and an optical tap TAP1.
- the optical communication signal branched by the optical tap TAP1 is applied to the photodiode PD1, thereby detecting the optical intensity of the optical communication signal input via the input terminal.
- the erbium-doped fiber EDF1 is provided after the pumping light coupler ELC1, and amplifies the optical communication signal with the pumping light.
- the optical switch OSW1 is provided after the erbium-doped fiber EDF1, and outputs the optical communication signal output from the erbium-doped fiber EDF1 to either one of the first branch and the second branch.
- the first branch path is the high gain path HGP and the second branch path is the low gain path LGP.
- the optical switch OSW2 selects either one of the first branch path and the second branch path, and transmits the optical communication signal transmitted through the selected branch path to the subsequent stage.
- the output terminal is an output port that is provided after the optical switch OSW2 and outputs an optical communication signal.
- a monitor unit MON2 is provided between the optical switch OSW2 and the output terminal.
- the monitor unit MON2 has a photodiode PD2 and an optical tap TAP2.
- the optical communication signal branched by the optical tap TAP2 is applied to the photodiode PD2, thereby detecting the optical intensity of the optical communication signal output via the output terminal.
- the high gain path HGP provided in the first branch is provided with an erbium-doped fiber EDF2, an excitation light coupler ELC2, and a gain equalizer GEQ1.
- the erbium-doped fiber EDF2 amplifies the optical communication signal applied to the first branch using pumping light.
- the pumping light coupler ELC2 is provided after the erbium-doped fiber EDF2, and combines the optical communication signal with the pumping light directed toward the erbium-doped fiber EDF2.
- the gain equalizer GEQ1 is provided after the excitation light coupler ELC2 and corrects the gain wavelength characteristic. More specifically, the gain equalizer GEQ1 corrects the gain wavelength characteristic of the total gain of the erbium-doped fiber EDF1 and the erbium-doped fiber EDF2.
- the low gain path LGP provided in the second branch path has an excitation light coupler ELC3 and a gain equalizer GEQ2.
- the excitation light coupler ELC3 combines the optical communication signal and the excitation light directed toward the optical switch OSW1.
- the gain equalizer GEQ2 is provided after the excitation light coupler ELC3 and corrects the gain wavelength characteristic. More specifically, the gain wavelength characteristic of the gain of the erbium-doped fiber EDF1 is corrected.
- the optical amplifier 1 emits pumping light from the pumping LD.
- the pumping light is distributed to the optical switch OSW1 and the optical switch OSW3 by the bifurcation coupler BNC.
- the optical switch OSW3 supplies the supplied excitation light to either one of the excitation light coupler ELC2 and the excitation light coupler ELC3.
- FIG. 3 shows a block diagram explaining the operation of the optical amplifier according to the first embodiment in the high gain mode
- FIG. 4 shows a block diagram explaining the operation of the optical amplifier according to the first embodiment in the low gain mode.
- show. 3 and 4 the flow of the optical communication signal is indicated by a thick solid line, and the flow of the excitation light is indicated by a thick dotted line.
- the optical switches OSW1 to OSW3 are operated in conjunction.
- the optical amplifier 1 achieves bidirectional pumping by applying pumping light to the erbium-doped fiber from the front of the erbium-doped fiber EDF1 and from the rear of the erbium-doped fiber EDF2 in high-gain operation.
- the optical amplifier 1 realizes bidirectional pumping by applying pumping light to the erbium-doped fiber EDF1 from both the forward and backward directions.
- high gain is realized by passing an optical communication signal through two erbium-doped fibers to the output terminal in high-gain operation, and one erbium-doped fiber is used in low-gain operation.
- a low gain is achieved by passing the optical communication signal to the output port only through the fiber.
- optical amplifier 1 In the optical amplifier 1 according to the first embodiment, reliability and cost performance are improved by reducing the number of parts. 1 will be described.
- FIG. 5 shows a block diagram of an optical amplifier 200 according to a comparative example.
- an excitation light coupler ELC2 that guides excitation light from the rear to the erbium-doped fiber is arranged after the optical switch OSW2, and a high gain is provided between the optical switches OSW1 and OSW2.
- a path HGP and a low gain path LGP are provided.
- the high gain path HGP is provided with a gain equalizer GEQ2 and an erbium-doped fiber EDF2.
- the gain equalizer GEQ2 corrects the total gain wavelength characteristics of the erbium-doped fiber EDF1 and the erbium-doped fiber EDF2.
- the low gain path LGP is provided with a gain equalizer GEQ3 and an erbium doped fiber EDF3.
- the gain equalizer GEQ3 corrects the total gain wavelength characteristics of the erbium-doped fiber EDF1 and the erbium-doped fiber EDF3.
- FIG. 6 shows a block diagram explaining the operation in the high gain mode of the optical amplifier according to the comparative example
- FIG. 7 shows a block diagram explaining the operation in the low gain mode of the optical amplifier according to the comparative example.
- the optical amplifier 200 according to the comparative example provides pumping light to the erbium-doped fiber from the front of the erbium-doped fiber EDF1 and from the rear of the erbium-doped fiber EDF2 in high-gain operation. Realize bi-directional excitation.
- the optical amplifier 200 realizes bidirectional pumping by applying pumping light to the erbium-doped fiber from the front of the erbium-doped fiber EDF1 and from the rear of the erbium-doped fiber EDF3.
- the erbium-doped fiber EDF3 is arranged after the gain equalizer GEQ3. Because it can't be done.
- the pumping coupler ELC2 is arranged after the optical switch OSW2 as in the optical amplifier 200 according to the comparative example, it is necessary to provide erbium-doped fibers in two paths with different gains.
- the number of erbium-doped fibers can be reduced by providing pumping optical couplers in two paths having different gains.
- the erbium-doped fiber is a fiber material doped with a rare earth metal, and is much more expensive than the pumping optical coupler or the optical switch. have.
- the optical amplifier 1 according to the first embodiment does not use a bar cross switch like the optical amplifier of Cited Document 1, for example. That is, in the optical amplifier 1 according to the first embodiment, the circuit configuration can be simplified. By simplifying the circuit configuration in this manner, the reliability of the optical amplifier 1 can be enhanced.
- the optical amplifier 1 according to the first embodiment is excellent in environmental performance by reducing the number of parts of the erbium-doped fiber using rare earth metals.
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Lasers (AREA)
- Optical Communication System (AREA)
Abstract
Description
以下、図面を参照して本発明の実施の形態について説明する。まず、図1に実施の形態1にかかる光増幅器が適用される通信システム100のブロック図を示す。図1に示すように、通信システム100は、送信装置110と受信装置120とを光伝送路130により接続する。
TAP1,TAP2 光タップ
PD1,PD1 フォトダイオード
MON1,MON2 モニタ部
ELC1,ELC2,ELC3 励起光カプラ
EDF1,EDF2,EDF3 エルビウムドープファイバ
OSW1,OSW2,OSW3 光スイッチ
GEQ1,GEQ2,GEQ3 利得等化器
BNC 2分岐カプラ
100 通信システム
110 送信装置
111 送信信号生成部
112 マルチプレクサ
113 送信アンプ
120 受信装置
121 受信アンプ
122 デマルチプレクサ
123 信号受信部
130 光伝送路
Claims (5)
- 光通信信号を入力する入力端子と、
前記光通信信号と励起光を合成する第1の励起光カプラと、
前記第1の励起光カプラの後段に設けられ、前記励起光により光通信信号を増幅する第1の光増幅媒体と、
前記第1の光増幅媒体の後段に設けられ、前記第1の光増幅媒体から出力される光通信信号を第1の分岐路と第2の分岐路のいずれか一方に出力する第1の光スイッチと、
前記第1の分岐路と前記第2の分岐路のいずれか一方を選択して、選択した分岐路を伝達してくる前記光通信信号を後段に伝達する第2の光スイッチと、
前記第2の光スイッチの後段に設けられ、前記光通信信号を出力する出力端子と、を有し、
前記第1の分岐路は、
前記励起光により前記光通信信号を増幅する第2の光増幅媒体と、
前記第2の光増幅媒体の後段に設けられ、前記光通信信号と前記第2の光増幅媒体に向かう方向の前記励起光を合成する第2の励起光カプラと、
前記第2の励起光カプラの後段に設けられ、利得波長特性を補正する第1の利得等化器と、を有し、
前記第2の分岐路は、
前記光通信信号と前記第1の光スイッチに向かう方向の前記励起光を合成する第3の励起光カプラと、
前記第3の励起光カプラの後段に設けられ、利得波長特性を補正する第2の利得等化器と、を有する光増幅器。 - 前記励起光を発する励起レーザーダイオードと、
前記第2の励起光カプラと前記第3の励起光カプラのいずれか一方に前記励起光を導く第3の光スイッチと、
前記励起光を前記第1の励起光カプラと前記第3の光スイッチとの両方に分岐させる2分岐カプラと、
をさらに有する請求項1に記載の光増幅器。 - 前記第1の利得等化器は、前記第1の光増幅媒体と前記第2の光増幅媒体との合計利得の利得波長特性を補正し、
前記第2の利得等化器は、前記第1の光増幅媒体の利得の利得波長特性を補正する請求項1又は2に記載の光増幅器。 - 前記入力端子と前記第1の励起光カプラとの間に、入力端子から入力される前記光通信信号を分岐させる第1のタップと、前記第1のタップにより分岐した前記光通信信号の光強度を検出する第1のフォトダイオードと、を有する第1のモニタ部と、
前記第2の光スイッチと前記出力端子との間に、出力端子から出力される前記光通信信号を分岐させる第2のタップと、前記第2のタップにより分岐した前記光通信信号の光強度を検出する第2のフォトダイオードと、を有する第2のモニタ部と、
を有する請求項1乃至3のいずれか1項に記載の光増幅器。 - 前記第1の光増幅媒体と第2の光増幅媒体は、エルビウムドープファイバである請求項1乃至4のいずれか1項に記載の光増幅器。
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US18/268,081 US20240055819A1 (en) | 2021-03-23 | 2022-02-16 | Optical amplifier |
JP2023508784A JP7533768B2 (ja) | 2021-03-23 | 2022-02-16 | 光増幅器 |
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Citations (9)
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JPH05218974A (ja) * | 1991-11-15 | 1993-08-27 | Nec Corp | 光増幅中継器 |
EP0621663A1 (en) * | 1993-04-22 | 1994-10-26 | Sumitomo Electric Industries, Limited | Optical fiber amplifier |
WO2005018065A1 (ja) * | 2003-08-13 | 2005-02-24 | Advantest Corporation | 光増幅装置 |
JP2011243803A (ja) * | 2010-05-19 | 2011-12-01 | Nec Corp | 光ファイバ増幅装置、及び該光ファイバ増幅装置における光信号増幅方法 |
JP2012175091A (ja) * | 2011-02-24 | 2012-09-10 | Nec Corp | 光増幅器制御装置 |
JP2015128157A (ja) * | 2013-12-20 | 2015-07-09 | オプリンク コミュニケーションズ, インコーポレイテッド | 利得切替可能な光増幅器 |
JP2016122745A (ja) * | 2014-12-25 | 2016-07-07 | 富士通株式会社 | スイッチャブル光アンプ及び光伝送装置 |
JP2016208358A (ja) * | 2015-04-24 | 2016-12-08 | 富士通株式会社 | 光増幅器、光伝送装置、及び光中継装置 |
JP2020182120A (ja) * | 2019-04-25 | 2020-11-05 | Kddi株式会社 | 光中継器及び光ファイバ伝送システム |
-
2022
- 2022-02-16 JP JP2023508784A patent/JP7533768B2/ja active Active
- 2022-02-16 WO PCT/JP2022/006278 patent/WO2022201991A1/ja active Application Filing
- 2022-02-16 US US18/268,081 patent/US20240055819A1/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05218974A (ja) * | 1991-11-15 | 1993-08-27 | Nec Corp | 光増幅中継器 |
EP0621663A1 (en) * | 1993-04-22 | 1994-10-26 | Sumitomo Electric Industries, Limited | Optical fiber amplifier |
WO2005018065A1 (ja) * | 2003-08-13 | 2005-02-24 | Advantest Corporation | 光増幅装置 |
JP2011243803A (ja) * | 2010-05-19 | 2011-12-01 | Nec Corp | 光ファイバ増幅装置、及び該光ファイバ増幅装置における光信号増幅方法 |
JP2012175091A (ja) * | 2011-02-24 | 2012-09-10 | Nec Corp | 光増幅器制御装置 |
JP2015128157A (ja) * | 2013-12-20 | 2015-07-09 | オプリンク コミュニケーションズ, インコーポレイテッド | 利得切替可能な光増幅器 |
JP2016122745A (ja) * | 2014-12-25 | 2016-07-07 | 富士通株式会社 | スイッチャブル光アンプ及び光伝送装置 |
JP2016208358A (ja) * | 2015-04-24 | 2016-12-08 | 富士通株式会社 | 光増幅器、光伝送装置、及び光中継装置 |
JP2020182120A (ja) * | 2019-04-25 | 2020-11-05 | Kddi株式会社 | 光中継器及び光ファイバ伝送システム |
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JP7533768B2 (ja) | 2024-08-14 |
JPWO2022201991A1 (ja) | 2022-09-29 |
US20240055819A1 (en) | 2024-02-15 |
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