CN102789109A - Light amplifier - Google Patents
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- CN102789109A CN102789109A CN2011101260553A CN201110126055A CN102789109A CN 102789109 A CN102789109 A CN 102789109A CN 2011101260553 A CN2011101260553 A CN 2011101260553A CN 201110126055 A CN201110126055 A CN 201110126055A CN 102789109 A CN102789109 A CN 102789109A
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- image intensifer
- pump light
- dispersion compensation
- amplifier
- control module
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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
- 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
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
- G02B6/29317—Light guides of the optical fibre type
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/29392—Controlling dispersion
- G02B6/29394—Compensating wavelength dispersion
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0078—Frequency filtering
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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
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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
- H01S3/094061—Shared pump, i.e. pump light of a single pump source is used to pump plural gain media in parallel
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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
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
Abstract
The invention provides a light amplifier which comprises a head amplifier, a middle accessing port and a power amplifier, wherein the head amplifier is used for amplifying a signal input into the light amplifier; the middle accessing port is used for coupling a dispersion compensating device; the dispersion compensating device is used for carrying out dispersion compensation on the signal amplified by the head amplifier; the power amplifier is coupled to the middle accessing port and is used for amplifying the signal compensated by the dispersion compensating device. With the adoption of the light amplifier, the effects that a dispersion compensating system is simplified and the system is managed conveniently are achieved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of image intensifer.
Background technology
The evolution process of hypervelocity (40Gbit/s or higher), extra long distance and vast capacity is just being experienced in the development of optical communication transmission system.Along with jumbo dense wave division multipurpose (Dense Wavelength Division Multiplexing; Abbreviate DWDM as) a large amount of and ripe application of optical communication system in the long-distance backbone network network, single wavelength speed rises to 40Gbit/s by original 155Mbit/s, 622Mbit/s, 2.5Gbit/s, 10Gbit/s.In the relatively low 155Mbit/s of single wavelength speed, 622Mbit/s, 2.5Gbit/s system, the transmission range of not having electric regenerative repeating mainly is subject to the deterioration of luminous power and OSNR (Optical Signal Noise Ratios abbreviates OSNR as).Yet; Erbium-Doped Fiber Amplifier (EDFA) (Erbium-doped Fiber Amplifier; Abbreviate EDFA as) appearance make the without electronic relay transmission range of optical transmission system surpass 100km; This is because EDFA has high-gain, bandwidth and reaches characteristics such as dynamic gain flattening greatly, can be with the multiplexing transmission simultaneously of the optical channel of several high speeds.And in single wavelength speed higher 10Gbit/s and 40Gbit/s system, chromatic dispersion becomes the primary limiting factor of the no electric regenerative repeating transmission range of restriction.
At present; The main method that solves the chromatic dispersion limited resource is through dispersion compensating fiber (Dispersion Compensating Fiber; Abbreviate DCF as) or dispersion compensation module (Dispersion Compensating module abbreviates DCM as) carry out dispersion compensation.Usually the method that adopts has following two kinds: a kind of is pre-compensating, and a kind of in addition is post-equalization.In pre-compensating, bigger insertion loss has been introduced in the access of DCF or DCM, has reduced and has gone into fine luminous power, and then limited the distance of the light transmission section of striding, and therefore, this method is less to be used.For post-equalization, method commonly used is as shown in Figure 1.OMU among the figure (Optical Multiplexer Unit) is an Optical Multiplexer Unit; OBA (Optical Boosting Amplifier) is a power amplifier; OPA (Optical Preamplifier) is the light prime amplifier; DCM is a dispersion compensation module, and ODU (Optical De-multiplexing Unit) is an Optical Demultiplexing Unit.In the method, in order to compensate the insertion loss of DCF or DCM, OBA and OPA will select suitable gain.Therefore, model and the system design to supply of material equipment all will have an assurance accurately can satisfy system requirements.And, adopt mode shown in Figure 2 to carry out dispersion compensation, the device of use is more, has increased the complicacy of system, and management is also relatively more difficult.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of image intensifer, and the factor that need consider when designing Dispersion Compensation Systems to solve at least in the correlation technique is a lot, and design is the problem of difficulty comparatively.
According to an aspect of the present invention, a kind of image intensifer is provided, has comprised: prime amplifier is used for the signal of input image intensifer is amplified; The indirect inbound port is used to the dispersion compensation device that is coupled, and dispersion compensation device is used for carrying out dispersion compensation through the prime amplifier amplifying signal; Power amplifier is coupled to the indirect inbound port, is used for the signal of dispersion compensating device dispersion compensation is amplified.
Preferably, above-mentioned image intensifer also comprises: first control module, first pump light source, second control module, second pump light source; Wherein, to be used to control first pump light source be that prime amplifier provides pump light to first control module; It is that power amplifier provides pump light that second control module is used to control second pump light source.
Preferably, above-mentioned image intensifer also comprises: control module, pump light source; Wherein, to be used to control pump light source be that prime amplifier and power amplifier provide pump light to control module.
Preferably, above-mentioned dispersion compensation device is one of following: DCF ply-yarn drill, DCM ply-yarn drill and FBG-DCM ply-yarn drill.
Preferably, above-mentioned image intensifer also comprises: adjustable attenuator, be arranged between prime amplifier and the indirect inbound port, and be used to adjust luminous power through the prime amplifier amplifying signal.
According to a further aspect in the invention, another kind of image intensifer is provided, has comprised: prime amplifier is used for the signal of input image intensifer is amplified; Dispersion compensation device is used for carrying out dispersion compensation through the prime amplifier amplifying signal; Power amplifier is used for the signal of dispersion compensating device dispersion compensation is amplified.
Preferably, above-mentioned image intensifer also comprises: first control module, first pump light source, second control module, second pump light source; Wherein, to be used to control first pump light source be that prime amplifier provides pump light to first control module; It is that power amplifier provides pump light that second control module is used to control second pump light source.
Preferably, above-mentioned image intensifer also comprises: control module, pump light source; Wherein, to be used to control pump light source be that prime amplifier and power amplifier provide pump light to control module.
Preferably, above-mentioned dispersion compensation device is one of following: DCF, DCM and FBG-DCM.
Preferably, above-mentioned image intensifer also comprises: adjustable attenuator, be arranged between prime amplifier and the dispersion compensation device, and be used to adjust luminous power through the prime amplifier amplifying signal.
Through the present invention; Employing is integrated into prime amplifier and power amplifier in the image intensifer; And dispersion compensation device is linked into the mode between prime amplifier and the power amplifier through external or integrated mode; Thereby when making image intensifer, considered the relation between prime amplifier and power amplifier and the dispersion compensation device, the factor that need consider when having solved design Dispersion Compensation Systems in the correlation technique is a lot, and design is the problem of difficulty comparatively; And then reached the design of simplifying Dispersion Compensation Systems, be convenient to the effect of system management.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the optical transmission chain allocation plan synoptic diagram according to correlation technique;
Fig. 2 is the structured flowchart according to the image intensifer of the embodiment of the invention one;
Fig. 3 is the structured flowchart according to the image intensifer of the embodiment of the invention two;
Fig. 4 is the optical amplifier structure synoptic diagram according to the band dispersion compensation indirect incoming interface of the embodiment of the invention;
Fig. 5 is the dispersion compensation module ply-yarn drill synoptic diagram according to the embodiment of the invention;
Fig. 6 is the optical amplifier structure synoptic diagram according to the band dispersion compensation indirect incoming interface after the structure optimization of the embodiment of the invention;
Fig. 7 is the dispersion compensation principle schematic based on the FBG reflection according to the embodiment of the invention;
Fig. 8 is the optical amplifier structure synoptic diagram according to the employing FBG-DCM ply-yarn drill of the embodiment of the invention;
Fig. 9 is according to the structural representation in the image intensifer that FBG-DCM is integrated into of the embodiment of the invention;
Figure 10 is the optical transmission chain allocation plan synoptic diagram according to the image intensifer of the employing band FBG-DCM of the embodiment of the invention.
Embodiment
Hereinafter will and combine embodiment to specify the present invention with reference to accompanying drawing.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
Embodiment one
The embodiment of the invention provides a kind of image intensifer, and this image intensifer can be used for technical fields such as the long Distance Transmission of optical fiber communication equipment.Fig. 2 is the structured flowchart according to the image intensifer of the embodiment of the invention one, and is as shown in Figure 2, and amplifier comprises:
Present embodiment is incorporated into the dispersion compensation technology in the design of light amplifier module; Designed a kind of image intensifer that has chromatic dispersion compensating function; Particularly, prime amplifier and power amplifier are integrated into image intensifer, and between prime amplifier and power amplifier, the indirect inbound port are set; Insert dispersion compensation device through the indirect inbound port, thereby realized in image intensifer, introducing the dispersion compensation technology.The image intensifer that adopts present embodiment to provide; The maintenance and management that helps system has reduced the size and the cost of image intensifer, simultaneously; This light amplifier module structurally also takes advantage, and this hypervelocity to future, extra long distance, the configuration of vast capacity optical transmission system are good.
In a preferred implementation of present embodiment, image intensifer also comprises: first control module, first pump light source, second control module, second pump light source; Wherein, to be used to control first pump light source be that prime amplifier 001 provides pump light to first control module; It is that power amplifier 002 provides pump light that second control module is used to control second pump light source.
In another preferred implementation of present embodiment, image intensifer also comprises: control module, pump light source; Wherein, to be used to control pump light source be that prime amplifier 001 provides pump light with power amplifier 002 to control module.
Above-mentioned two kinds of implementations all can be implemented as prime amplifier 001 and with power amplifier 002 pump light are provided, and wherein, it is that prime amplifier 001 provides pump light with power amplifier 002 that second kind of implementation only adopts a control module and pump light source; Because the pumping light wavelength of amplifier can be identical, therefore, second kind of implementation can realize; And; With respect to first kind of implementation, second kind of implementation reduced uses the number of device, thereby has reduced cost; Save the amplifier occupation space, more helped practical application.
Wherein, above-mentioned dispersion compensation device can be for one of following: DCF ply-yarn drill, DCM ply-yarn drill and optical fiber bragg grating FBG-DCM ply-yarn drill.Present embodiment is connected to indirect inbound port 003 with ply-yarn drill again through DCF, DCM or FBG-DCM are made into the ply-yarn drill form, has realized in image intensifer, inserting dispersion compensation device; And the form of employing ply-yarn drill can make things convenient for the access of dispersion compensation device.In addition; Present embodiment is incorporated into FBG in the dispersion compensation technology; Insert loss little (generally speaking, it is about 3 to 4dB that the FBG-DCM of 120km inserts loss) because FBG dispersion compensation module (FBG-DCM) has, and insert loss and almost have nothing to do with transmission span; Like this, the FBG-DCM module can adopt the littler packing forms of volume.The major advantage of the relative DCF-DCM of FBG-DCM is that lag time is short, that is, the time delay that device of light signal entering causes is very short, and another advantage is when high luminous power is imported, can not produce nonlinear effect.These key properties of FBG-DCM not only make the structure of image intensifer be improved, and have reduced the overall system cost significantly.
Preferably, image intensifer also comprises: adjustable attenuator, be arranged between prime amplifier and the indirect inbound port, and be used to adjust luminous power through the prime amplifier amplifying signal.Present embodiment is through being provided with adjustable attenuator, the luminous power that can regulate the signal that enters into dispersion compensation device before the indirect inbound port.
Embodiment two
The embodiment of the invention provides another kind of image intensifer, and Fig. 3 is the structured flowchart according to the image intensifer of the embodiment of the invention two, and is as shown in Figure 3, and amplifier comprises: prime amplifier 001 is used for the signal of input image intensifer is amplified; Dispersion compensation device 010 is coupled to prime amplifier 001, is used for carrying out dispersion compensation through prime amplifier 001 amplifying signal; Power amplifier 002 is coupled to dispersion compensation device 010, is used for the signal of dispersion compensating device 010 dispersion compensation is amplified.
Present embodiment is incorporated into the dispersion compensation technology in the design of light amplifier module; Designed a kind of image intensifer that has chromatic dispersion compensating function; Particularly, dispersion compensation device is integrated in the image intensifer, thereby has realized in image intensifer, introducing the dispersion compensation technology.The image intensifer that adopts present embodiment to provide; The maintenance and management that helps system has reduced the size and the cost of image intensifer, simultaneously; This light amplifier module structurally also takes advantage, and this hypervelocity to future, extra long distance, the configuration of vast capacity optical transmission system are good.
In a preferred implementation of present embodiment, image intensifer also comprises: first control module, first pump light source, second control module, second pump light source; Wherein, to be used to control first pump light source be that prime amplifier 001 provides pump light to first control module; It is that power amplifier 002 provides pump light that second control module is used to control second pump light source.
In another preferred implementation of present embodiment, image intensifer also comprises: control module, pump light source; Wherein, to be used to control pump light source be that prime amplifier 001 provides pump light with power amplifier 002 to control module.
Above-mentioned two kinds of implementations all can be implemented as prime amplifier and power amplifier provides pump light, and wherein, it is that prime amplifier and power amplifier provide pump light that second kind of implementation only adopts a control module and pump light source; Because the pumping light wavelength of amplifier can be identical, therefore, second kind of implementation can realize; And; With respect to first kind of implementation, second kind of implementation reduced uses the number of device, thereby has reduced cost; Save the amplifier occupation space, more helped practical application.
Wherein, dispersion compensation device is one of following: DCF, DCM, FBG-DCM.Present embodiment can be integrated in existing dispersion compensation device (DCF or DCM) in the image intensifer, also can the FBG-DCM that the inventor finds be integrated in the image intensifer.Insert loss little (generally speaking, it is about 3 to 4dB that the FBG-DCM of 120km inserts loss) because FBG-DCM has, and insert loss and almost have nothing to do with transmission span, like this, the FBG-DCM module can adopt the littler packing forms of volume.The major advantage of the relative DCF-DCM of FBG-DCM is that lag time is short, that is, the time delay that device of light signal entering causes is very short, and another advantage is when high luminous power is imported, can not produce nonlinear effect.These key properties of FBG-DCM not only make the structure of image intensifer be improved, and have reduced the overall system cost significantly.
Preferably, image intensifer also comprises: adjustable attenuator, be arranged between prime amplifier and the dispersion compensation device, and be used to adjust luminous power through the prime amplifier amplifying signal.Present embodiment is through being provided with adjustable attenuator, the luminous power that can regulate the signal that enters into dispersion compensation device before dispersion compensation device.
Embodiment three
In traditional fiber communication chief Distance Transmission allocation plan; Limited limited in order to solve luminous power with fibre-optical dispersion; Through increasing image intensifer and DCM (referring to Fig. 1), in order to compensate the insertion loss of DCF or DCM, OBA and OPA will select suitable gain respectively; This model and system design to image intensifer all will have an assurance accurately can satisfy system requirements; And system maintenance, equipment control more complicated, it is big on package dimension and structure, to occupy the space, increased system synthesis this.The purpose of present embodiment is to reduce the complexity of system design and help system management; In order to reach this purpose; Present embodiment designs a kind of band chromatic dispersion compensating function through the dispersion compensation technology is incorporated in the design of light amplifier module, is convenient to system maintenance, management; And the light amplifier module that on size, cost and structure, takes advantage; The optical communication transmission is long to have reduced system cost apart from allocation plan thereby simplified, and this hypervelocity to future, extra long distance, the configuration of vast capacity optical transmission system have very important practical value.
The design philosophy of present embodiment is as shown in Figure 4; The dispersion compensation technology is introduced in the design of image intensifer; Except the amplification of realizing light signal, configuration interface flexibly also is provided, can dispose several kinds of different dispersion compensation modes; Simultaneously, can also realize the dispersion compensation functions of optical transmission system.The design of the image intensifer shown in the present embodiment is made up of the two large divisions; First is the luminous power amplifying unit, is made up of low-noise preamplifier (PA) 001, power amplifier (BA) 002, indirect inbound port 003, adjustable attenuator 004, photo-detector 005, pump laser 006, image intensifer control module 007 and serial line interface 008.Second portion is dispersion compensation ply-yarn drill unit; Insert connector (for example, indirect inbound port 003) in the middle of between two-stage amplifier, having, can insert the dispersion compensation ply-yarn drill easily; For example; DCF-DCM ply-yarn drill or Fiber Bragg Grating FBG (Fiber Bragg Grating abbreviates FBG as) dispersion compensation module (FBG-DCM) ply-yarn drill, as shown in Figure 5.Because it is little (generally speaking that FBG dispersion compensation module (FBG-DCM) has the loss of insertion; It is about 3 to 4dB that the FBG-DCM of 120km inserts loss); And it is almost irrelevant to insert loss and transmission span, and like this, the FBG-DCM module can adopt the littler packing forms of volume.The major advantage of relative DCF of FBG-DCM or existing DCM is that lag time is short, i.e. the time delay that device of light signal entering causes is very short; Another advantage is when high luminous power is imported, can not produce nonlinear effect.These key properties of FBG-DCM not only make the structure of amplifier be improved, and have reduced the overall system cost significantly.Given this,, then can further simplify the structure of amplifier if be changed to FBG-DCM to DCF or existing DCM, and the noise figure that can not influence.And the structure after the simplification has been lacked a lot of Passive Optical Components (for example, optoisolator, pump signal compositor, connector), and this has further reduced noise figure.
Preferably, the optical amplifier structure of band dispersion compensation can be simplified to structure shown in Figure 6, with respect to structure shown in Figure 4; In image intensifer shown in Figure 6; Single control loop has replaced the control loop of two separations, and circuit is further simplified, and this will reduce by 30% cost.
Preferably, as shown in Figure 9, can also the circulator of FBG be integrated in the image intensifer, this will further optimize improvement Design of Amplifier structure, reduce cost.
Adopt the design proposal of present embodiment can the dispersion compensation technology be introduced directly in the design of image intensifer, design a kind of band chromatic dispersion compensating function, be convenient to system maintenance, management; And the light amplifier module that on size, cost and structure, takes advantage; The optical communication transmission is long to have reduced system cost apart from allocation plan thereby simplified, and has simplified the complexity of system design and has helped system management; And then help reducing the parts selection requirement; Effectively the control cost of products improves the competitiveness of product in market, and this hypervelocity to future, extra long distance, the configuration of vast capacity optical transmission system have very important practical value.
Embodiment four
As shown in Figure 8, be example with the image intensifer that has the FBG-DCM ply-yarn drill below, the implementation of the embodiment of the invention is described.In the practical implementation process, adopt the FBG-DCM ply-yarn drill to replace traditional DCF or DCM ply-yarn drill.Use FBG reflection carrying out dispersion compensation and the traditional approach that uses DCF to compensate that the difference of essence is arranged.The ultimate principle of carrying out dispersion management through FBG is to use an accurate chirped fiber grating that different wavelengths is introduced different time delay; Can make grating specially so that the dispersion characteristic on analog optical fiber or certain span; The specification that light is deleted can be selected according to actual conditions, and is preferably, as shown in Figure 7; The length of grating is 10m, and the cycle of grating is 1dm.The most significant advantage of FBG-DCM is that the insertion loss is little, and the FBG-DCM of generalized case 120km inserts loss 3 to 4dB, and the insertion loss of equal DCF then is 10dB at least.And the Insertion Loss of FBG-DCM and transmission span are almost irrelevant, and the Insertion Loss of DCF-DCM then increases along with the increase of optical fiber and transmission span.
The design of the image intensifer shown in the present embodiment is made up of two parts; First is the luminous power amplifying unit, is made up of low-noise preamplifier (PA) 001, power amplifier (BA) 002, indirect inbound port 003, adjustable attenuator 004, pump laser 005, photo-detector 006, image intensifer control module 007 and serial line interface 008.Second portion is a FBG dispersion compensation ply-yarn drill 009, is linked on the luminous power amplifying unit through the middle connector that inserts between the two-stage amplifier.Through above-mentioned design, can insert the dispersion compensation ply-yarn drill easily, like DCF ply-yarn drill, DCM ply-yarn drill or FBG-DCM ply-yarn drill, as shown in Figure 5.
In this image intensifer, prime amplifier 001 is the adjustable prime amplifier of luminous power of a low noise, high bandwidth, and the noise power that this prime amplifier restriction system is introduced allows multi-wavelength light to pass through and the acquisition identical gain.The luminous power of prime amplifier 001 is adjustable be for after the adjustable attenuator that the connects Insertion Loss that cooperates compensation FBG-DCM to introduce.The power amplifier 002 of Gain Adjustable is used to provide the Output optical power of total system, improves the incident optical power of long haul optical transmission, the loss of compensation optical link.Adjustable attenuator 004 is to cooperate prime amplifier 001 and design; Be used for after prime amplifier 001 Output optical power setting value satisfies system requirements; Adjustment is input to the input optical power of FBG-DCM ply-yarn drill 009; Make this input optical power satisfy the input optical power requirement of dispersion compensation ply-yarn drill, and compensate the Insertion Loss of FBG-DCM ply-yarn drill.FBG-DCM ply-yarn drill 009 is linked in the image intensifer unit through the indirect inbound port 003 of system, is used for compensating the chromatic dispersion of optical transmission system, and it inserts Insertion Loss and is approximately 3～4dB, and the Insertion Loss value almost has nothing to do with transmission span.Photo-detector 005 is used to detect input optical power, and the power signal of input optical signal is exported to image intensifer control module 007.Pumping 006 is used for amplifying optical signals by laser constitution.Image intensifer control module 007 is the control core of total system, can be made up of pump power control module, pump current drives unit, input optical power detecting unit, microprocessor unit and cut-off current protected location.Wherein, the drive current of pump power control module testing pump or output optical signal power produce feedback signal according to the size of the power of drive current or output light signal, and output feedback signal gives the pumping current driver element, to regulate the size of drive current.The pumping current driver element is integrated in the image intensifer control module 007, for pumping 006 provides drive current, drives pumping 006 work.The power of the input optical signal of input optical power detection pumping, and give microprocessor with the power signal transmissions of input optical signal.Microprocessor unit is used to control computing, and output control circuit automatically shuts down current protective device when receiving power signal from the input optical signal of input optical power detector 005 and exceed setting range.When the cut-off current protected location receives the outage control signal of the inner microprocessor of control module, the pump current driving circuit is controlled, cut off drive current.Serial line interface 008 adopts the RS232 interface, is used to the operational factor of the system that is provided with and reports running status and alarm, and network management interface 008 adopts RJ45 that SNMP is provided network management interface, and direct access network management system is so that system maintenance and operated from a distance.
Preferably, can adopt the image intensifer of band dispersion compensation indirect incoming interface as shown in Figure 6, use a pump light 006 and a control module 007 pump light to be provided in this image intensifer as prime amplifier 001 and power amplifier 002.Dispersion compensation module can be selected to be equipped with according to concrete applicable cases, and wherein, dispersion compensation module can be made supporting ply-yarn drill form, to make things convenient for Installation and Debugging.
In addition, have many good qualities based on the image intensifer of DCF or DCM relatively based on the image intensifer of FBG-DCM, therefore; As shown in Figure 9, can pass through design optimization, the circulator of FBG is integrated in the image intensifer; The project organization that this will further simplify image intensifer reduces cost.
Image intensifer shown in the present embodiment can be applied in the actual optical transmission chain; Figure 10 shows the optical transmission chain allocation plan of the image intensifer that adopts band FBG-DCM ply-yarn drill or integrated FBG-DCM; This allocation plan simple and clear; Maintenance management is comparatively convenient, has promoted the advantage of optical transmission system on structure and cost, has strengthened the competitiveness of product in market.
In sum; Present embodiment is incorporated into the dispersion compensation technology in the design of light amplifier module; Designed a kind of image intensifer that has chromatic dispersion compensating function; Thereby when making image intensifer, considered the relation between prime amplifier and power amplifier and the dispersion compensation device, reached the design of simplifying Dispersion Compensation Systems, be convenient to the effect of system management.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the memory storage and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an image intensifer is characterized in that, comprising:
Prime amplifier is used for the signal of importing said image intensifer is amplified;
The indirect inbound port is used to the dispersion compensation device that is coupled, and said dispersion compensation device is used for carrying out dispersion compensation through said prime amplifier amplifying signal;
Power amplifier is coupled to said indirect inbound port, is used for the signal through said dispersion compensation device dispersion compensation is amplified.
2. image intensifer according to claim 1 is characterized in that, said image intensifer also comprises:
First control module, first pump light source, second control module, second pump light source; Wherein,
It is that said prime amplifier provides pump light that said first control module is used to control said first pump light source;
It is that said power amplifier provides pump light that said second control module is used to control said second pump light source.
3. image intensifer according to claim 1 is characterized in that, said image intensifer also comprises:
Control module, pump light source; Wherein,
It is that said prime amplifier and said power amplifier provide pump light that said control module is used to control said pump light source.
4. according to each described image intensifer in the claim 1 to 3, it is characterized in that said dispersion compensation device is one of following:
Dispersion compensating fiber DCF ply-yarn drill, dispersion compensation module DCM ply-yarn drill and optical fiber bragg grating FBG-DCM ply-yarn drill.
5. according to each described image intensifer in the claim 1 to 3, it is characterized in that said image intensifer also comprises:
Adjustable attenuator is arranged between said prime amplifier and the said indirect inbound port, is used to adjust the luminous power of the said signal that amplifies through said prime amplifier.
6. an image intensifer is characterized in that, comprising:
Prime amplifier is used for the signal of importing said image intensifer is amplified;
Dispersion compensation device is used for carrying out dispersion compensation through said prime amplifier amplifying signal;
Power amplifier is used for the signal through said dispersion compensation device dispersion compensation is amplified.
7. image intensifer according to claim 6 is characterized in that, said image intensifer also comprises:
First control module, first pump light source, second control module, second pump light source; Wherein,
It is that said prime amplifier provides pump light that said first control module is used to control said first pump light source;
It is that said power amplifier provides pump light that said second control module is used to control said second pump light source.
8. image intensifer according to claim 6 is characterized in that, said image intensifer also comprises:
Control module, pump light source; Wherein,
It is that said prime amplifier and said power amplifier provide pump light that said control module is used to control said pump light source.
9. according to each described image intensifer in the claim 6 to 8, it is characterized in that said dispersion compensation device is one of following:
Dispersion compensating fiber DCF, dispersion compensation module DCM and optical fiber bragg grating FBG-DCM.
10. according to each described image intensifer in the claim 6 to 8, it is characterized in that said image intensifer also comprises:
Adjustable attenuator is arranged between said prime amplifier and the said dispersion compensation device, is used to adjust the luminous power of the said signal that amplifies through said prime amplifier.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011101260553A CN102789109A (en) | 2011-05-16 | 2011-05-16 | Light amplifier |
| PCT/CN2012/072685 WO2012155654A1 (en) | 2011-05-16 | 2012-03-21 | An optical amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101260553A CN102789109A (en) | 2011-05-16 | 2011-05-16 | Light amplifier |
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| WO (1) | WO2012155654A1 (en) |
Citations (5)
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|---|---|---|---|---|
| CN1329267A (en) * | 2000-06-09 | 2002-01-02 | 阿尔卡塔尔公司 | Amplifier of wavelength division multiplexing system and method for amplifying light signal |
| CN2496195Y (en) * | 2001-08-16 | 2002-06-19 | 华为技术有限公司 | Light relay equipment |
| US6710916B1 (en) * | 2001-08-23 | 2004-03-23 | Onetta, Inc. | Grating-based dispersion compensation devices |
| CN1841174A (en) * | 2001-06-14 | 2006-10-04 | 富士通株式会社 | Optical amplifier for amplifying multi-wavelength light |
| US20100271204A1 (en) * | 2009-04-22 | 2010-10-28 | Fujitsu Limited | Optical amplifier module and dispersion compensation fiber loss detection method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436908A (en) * | 2007-11-12 | 2009-05-20 | 王国栋 | Method and apparatus for compensating and amplifying optical fibre color dispersion |
| CN101621175A (en) * | 2009-06-23 | 2010-01-06 | 中兴通讯股份有限公司 | Optical fiber amplifier with chromatic dispersion compensating function and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1329267A (en) * | 2000-06-09 | 2002-01-02 | 阿尔卡塔尔公司 | Amplifier of wavelength division multiplexing system and method for amplifying light signal |
| CN1841174A (en) * | 2001-06-14 | 2006-10-04 | 富士通株式会社 | Optical amplifier for amplifying multi-wavelength light |
| CN2496195Y (en) * | 2001-08-16 | 2002-06-19 | 华为技术有限公司 | Light relay equipment |
| US6710916B1 (en) * | 2001-08-23 | 2004-03-23 | Onetta, Inc. | Grating-based dispersion compensation devices |
| US20100271204A1 (en) * | 2009-04-22 | 2010-10-28 | Fujitsu Limited | Optical amplifier module and dispersion compensation fiber loss detection method |
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