CN101083382A - Low noise tunable single frequency fiber laser for full-optical communication and its test system - Google Patents
Low noise tunable single frequency fiber laser for full-optical communication and its test system Download PDFInfo
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- CN101083382A CN101083382A CNA2007100558111A CN200710055811A CN101083382A CN 101083382 A CN101083382 A CN 101083382A CN A2007100558111 A CNA2007100558111 A CN A2007100558111A CN 200710055811 A CN200710055811 A CN 200710055811A CN 101083382 A CN101083382 A CN 101083382A
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Abstract
The invention publishes a low noise harmonious mono-frequent optical fiber laser which is used in the entire optical communication and its test system, aimed at solving the density change of the free current carrier in the source area of the semiconductor laser launch process, caused the twitter effect to cause the line-breadth phenomenon, could not satisfy the question that the high speed large capacity development request of the high speed wavelength division multiplying system and the optical communication. The laser contains the pump source, the optical coupler, the light isolator, the invariable light attentuator, the wavelength division multiplexer, the erbium ytterbium double mix optical fiber, the light circulator, the optical fiber polarizer, the er-doped optical fiber and the harmonious fiber grating. The test system is composed of the optical fiber laser, the light modulator, the actuation module, the error code analyzer, the light oscilloscope or the error code analyzer, the receive module and the light attentuator. The laser has mono-frequent, low noise, low twitter; the output is stable; suitable to use in the high speed long distance optical communication and take as the photo source in the optical fiber sensing; the test system may carry on the test analysis to laser's high speed electric light modulating characteristic.
Description
Technical field
The present invention relates to a kind of laser beam emitting device and a kind of service check device in all optical communication field, in particular, relate to a kind of low noise tunable single frequency fiber laser for full-optical communication and test macro thereof.
Background technology
In recent years, optoelectronic areas research and application process development are rapid in the world.Passive and the active all optical communication device of various high speeds constantly occurs, and as product commercializations such as two-forty optical modulator, fiber gratings, the developing into of these devices carried out this research and created very advantageous conditions.Along with the development, the particularly maturation of fiber grating practicability technology of domestic pumping source manufacturing technology and optical fiber fabrication technology (as material doped) etc., for very favourable technical conditions have been created in the two researchs of mixing fiber laser of single-frequency annular erbium/ytterbium.Carry out this research in good time, can capture the forward position of Fibre Optical Sensor high-tech area, grasp independent intellectual property right, for extensive industrialization in future is taken a firm foundation.Carry out this research the big Capacity Optical development of Communication Technique of two-forty of new generation is had important scientific meaning and using value.Through up-to-date document and new patent searching retrieval, do not see the patent report of relevant low noise tunable single frequency fiber laser for full-optical communication so far as yet.Carrier wave light source in the optical fiber telecommunications system adopts distributed feed-back (DFB) semiconductor laser usually at present, but its emission process is accompanied by the change in concentration of free carrier in the active area, cause chirp to make broadening of spectral lines, can not satisfy the demand for development of two-forty wavelength-division multiplex system, become and hinder the significant obstacle of modern optical communication to the big capacity development of two-forty.The high performance single frequency optical fiber laser product that development is fit to fiber-optic communications traffic becomes international forward position hot subject.
Summary of the invention
Technical problem to be solved by this invention is to overcome existing technical problem in the prior art, provides a kind of single-frequency low noise optical-fiber laser seed source to add the low noise tunable single frequency fiber laser for full-optical communication of the full fiber type tunable wave length of optic fiber amplifying module structure.A kind of test macro of testing low noise tunable single frequency fiber laser for full-optical communication also is provided simultaneously.
Consult Fig. 1, for solving the problems of the technologies described above, the present invention adopts following technical scheme to be achieved.Described low noise tunable single frequency fiber laser for full-optical communication is mainly by pumping source, the splitting ratio that laser that pumping source sent is carried out pumping to fiber laser and amplifier simultaneously is 35: 65 a optical coupler, be labeled as 3 optical isolator, variable optical attenuator, be labeled as 6 wavelength division multiplexer, be labeled as the two optical fiber of mixing of 7 erbium ytterbium, be labeled as 8 optical isolator, be labeled as 9 wavelength division multiplexer, be labeled as the two optical fiber of mixing of 10 erbium ytterbium, splitting ratio is 10: 90 a optical coupler, be labeled as 12 optical isolator, optical circulator, fibre optic polarizer, Er-doped fiber, tunable fiber grating is formed.
The output of pumping source and splitting ratio are that the public port of 35: 65 optical coupler links to each other; Splitting ratio is that 65% port and 35% port of 35: 65 optical coupler links to each other with the 980nm port that is labeled as 9 wavelength division multiplexer with the 980nm port that is labeled as 6 wavelength division multiplexer respectively; The 1550nm port that is labeled as 9 wavelength division multiplexer is connected on the port one of optical circulator; Er-doped fiber as saturated absorbing body links to each other with tunable fiber grating with the port 2 of optical circulator respectively; The port 3 of optical circulator connects an end of fibre optic polarizer, and the fibre optic polarizer other end links to each other with the optical isolator arrival end that is labeled as 12; The port of export that is labeled as 12 optical isolator is that the public port of 10: 90 optical coupler links to each other with splitting ratio again; Splitting ratio is that 10% port linkage flag of 10: 90 optical coupler is 10 the two ends of mixing optical fiber of erbium ytterbium; Being labeled as the two other ends of mixing optical fiber of 10 erbium ytterbium links to each other with the public port that is labeled as 9 wavelength division multiplexer again; Splitting ratio is that 90% port linkage flag of 10: 90 optical coupler is the arrival end of 8 optical isolator, is labeled as 8 the optical isolator port of export and is connected with the two ends of mixing optical fiber of the erbium ytterbium that is labeled as 7; Being labeled as the two other ends of mixing optical fiber of 7 erbium ytterbium is connected on the public port that is labeled as 6 wavelength division multiplexer; The 1550nm port linkage flag that is labeled as 6 wavelength division multiplexer is the arrival end of 3 optical isolator, being labeled as 3 the optical isolator port of export links to each other with the input port of variable optical attenuator, the output port of variable optical attenuator is as the laser output mouth, more than connection between each part all adopt optical fiber to connect.
Pumping source described in the technical scheme is to be 35: 65 optical coupler provides the pump light of 980nm simultaneously for fiber laser and amplifier 980nm pumping source by splitting ratio; Described 6 the wavelength division multiplexer with being labeled as 9 of being labeled as is two 980/1550nm wavelength division multiplexers that structure is identical; Describedly be labeled as 3, being labeled as 8 the optical isolator with being labeled as 12 is three optical isolators that structure is identical; It is described that to shorten long 7 and 10 the erbium-ytterbium co-doped fiber of being labeled as that reduces noise in chamber effectively be to adopt the erbium ytterbium weight concentration of optimizing (WT%) to be respectively 0.41% and 2.06% and the erbium ytterbium made pair is mixed optical fiber.
Ginseng Fig. 2, described test macro is made up of fiber laser, optical modulator, driver module, bit error analyzing instrument, oscilloscope, receiver module, optical attenuator.
Fiber laser links to each other with optical modulator optical fiber, optical modulator links to each other with optical attenuator optical fiber, and optical attenuator links to each other with receiver module optical fiber, and receiver module links to each other with the oscilloscope electric wire, the bit error analyzing instrument links to each other with the driver module electric wire, driver module be connected by the optical modulator electric wire of its driving.
Oscilloscope described in the technical scheme also can be used instead and be the bit error analyzing instrument, and the bit error analyzing instrument is that electric wire links to each other with receiver module; Described fiber laser is a low noise tunable single frequency fiber laser for full-optical communication, i.e. the tested optical fiber laser.
The invention has the beneficial effects as follows:
(1) low noise tunable single frequency fiber laser for full-optical communication can be used for the long-distance optical fiber transmission;
(2) low noise tunable single frequency fiber laser for full-optical communication can be used for the full light high-speed communicating network of high code check;
(3) because low noise tunable single frequency fiber laser for full-optical communication has natural good radiating mode, its power output is stable;
(4) low noise tunable single frequency fiber laser for full-optical communication can be realized the 40nm wideband tunable;
(5) low noise tunable single frequency fiber laser for full-optical communication has single-frequency, low noise, low characteristics of warbling, and comparing with existing DFB-LD has more superior performance;
(6) low noise tunable single frequency fiber laser for full-optical communication adopts all optical fibre structure mode, can realize the optical fiber coupling of real low insertion loss;
(7) low noise tunable single frequency fiber laser for full-optical communication adopts the modularized design of compact conformation, reduces its cost of manufacture to greatest extent.
Description of drawings
The present invention is described in further detail below in conjunction with accompanying drawing:
Fig. 1 is the light path principle figure of low noise tunable single frequency fiber laser for full-optical communication;
Among the figure: 1. pumping source, 2. splitting ratio is 35: 65 optical coupler, 3. optical isolator, 4. variable optical attenuator, 5. laser output mouth, 6. wavelength division multiplexer, 7. two optical fiber, 8. optical isolator, 9. wavelength division multiplexers mixed of erbium ytterbium, 10. the erbium ytterbium is two mixes optical fiber, and 11. splitting ratios are 10: 90 optical coupler, 12. optical isolators, 13. optical circulator, 14. fibre optic polarizer, 15. Er-doped fibers, 16. tunable fiber gratings.
Fig. 2 is the composition frame chart to the test macro of the actual test of many speed electric light external modulation characteristic of low noise tunable single frequency fiber laser for full-optical communication;
Among the figure: 1. fiber laser, 2. optical modulator, 3. driver module, 4. bit error analyzing instrument, 5. oscilloscope, 6. receiver module, 7. optical attenuator.
Fig. 3 (a) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the transmission eye pattern of light signal when sign indicating number speed is 1.25Gbps;
Fig. 3 (b) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the transmission eye pattern of light signal when sign indicating number speed is 2.488Gbps;
Fig. 3 (c) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the transmission eye pattern of light signal when sign indicating number speed is 9.95 3Gbps.
Fig. 4 (a) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the receiving optical signals eye pattern of light signal after the transmission of 21km monomode fiber when sign indicating number speed is 1.25Gbps;
Fig. 4 (b) be laser that low noise tunable single frequency fiber laser for full-optical communication is sent through after the external modulation, the receiving optical signals eye pattern of light signal after the transmission of 21km monomode fiber during the fast 2.488Gbps of sign indicating number;
Fig. 4 (c) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the receiving optical signals eye pattern of light signal after the transmission of 21km monomode fiber when sign indicating number speed is 9.95 3Gbps.
Fig. 5 (a) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the receiving optical signals eye pattern of light signal after the transmission of 42km monomode fiber when sign indicating number speed is 1.25Gbps;
Fig. 5 (b) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the receiving optical signals eye pattern of light signal after the transmission of 42km monomode fiber when sign indicating number speed is 2.488Gbps;
Fig. 5 (c) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the receiving optical signals eye pattern of light signal after the transmission of 42km monomode fiber when sign indicating number speed is 9.953Gbps.
Fig. 6 (a) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the receiving optical signals eye pattern of light signal after the transmission of 63km monomode fiber when sign indicating number speed is 1.25Gbps;
Fig. 6 (b) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the receiving optical signals eye pattern of light signal after the transmission of 63km monomode fiber when sign indicating number speed is 2.488Gbps;
Fig. 6 (c) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the receiving optical signals eye pattern of light signal after the transmission of 63km monomode fiber when sign indicating number speed is 9.953Gbps.
Fig. 7 (a) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the receiving optical signals eye pattern of light signal after the transmission of 84km monomode fiber when sign indicating number speed is 1.25Gbps;
Fig. 7 (b) is after the laser that low noise tunable single frequency fiber laser for full-optical communication sends is passed through external modulation, the receiving optical signals eye pattern of light signal after the transmission of 84km monomode fiber when sign indicating number speed is 2.488Gbps.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing:
Shown in the accompanying drawing 1 is the light path principle figure of low noise tunable single frequency fiber laser for full-optical communication.It comprises following main parts size:
Splitting ratio is 35: 65 a optical coupler 2, is coupling between pumping source 1 and 980/1550nm wavelength division multiplexer 6 and the 980/1550nm wavelength division multiplexer 9, and the pump light of 980nm pumping source 1 is transferred to fiber laser and amplifier;
Variable optical attenuator 4 is realized the adjustment of laser Output optical power with the performance of integrated low insertion loss;
980/1550nm wavelength division multiplexer 6 is transferred to the two optical fiber 7 of mixing of erbium/ytterbium to the pump light that from splitting ratio is 35: 65 optical coupler 2, and the laser that produces is exported from fiber amplifier;
The two optical fiber 7 of mixing of erbium/ytterbium, the gain media that the annular cavity optical fiber amplifier adopts;
980/1550nm wavelength division multiplexer 9 is transferred to the two optical fiber 10 of mixing of erbium/ytterbium to the pump light that from splitting ratio is 35: 65 optical coupler 2;
The two optical fiber 10 of mixing of erbium/ytterbium, the gain media that circular cavity optic fibre laser adopts;
Splitting ratio is 10: 90 a optical coupler 11, is coupling in that optical isolator 12 and optical isolator 8 and erbium/ytterbium are two to be mixed between the optical fiber 10; Splitting ratio is that the public port of 10: 90 optical coupler 11 links to each other with the outlet of optical isolator 12, and 10% port of optical coupler 11 connects the two optical fiber 10 of mixing of erbium/ytterbium, and 90% port of optical coupler 11 connects the arrival end of optical isolator 8;
Fibre optic polarizer 14 can keep the transmission of a kind of polarization state light, makes that other polarization mode is effectively suppressed in the chamber;
Er-doped fiber 15 is connected in as saturated absorbing body on the port 2 of optical circulator 13, to obtain stable single-frequency laser output;
Tunable fiber grating 16 as narrowband reflection formula wavelength choice structure, along with the draw power increase has suppressed spontaneous radiation, is selected specific wavelength and resonance generation laser through the tunable fiber grating.
Annexation between them is: 980nm pumping source 1 and splitting ratio are that the public port of 35: 65 optical coupler 2 links to each other; Splitting ratio is that 65% port of 35: 65 optical coupler 2 links to each other with the 980nm port of 980/1550nm wavelength division multiplexer 6 and the 980nm port of 980/1550nm wavelength division multiplexer 9 respectively with 35% port; The 1550nm port of wavelength division multiplexer 9 is connected on the port one of optical circulator 13; Er-doped fiber 15 as saturated absorbing body links to each other with tunable fiber grating 16 with the port 2 of optical circulator 13 respectively; The port 3 of optical circulator 13 connects an end of fibre optic polarizer 14, and fibre optic polarizer 14 other ends link to each other with optical isolator 12 arrival ends; Optical isolator 12 ports of export are that the public port of 10: 90 optical coupler 11 links to each other with splitting ratio again; Splitting ratio is that 10% port of 10: 90 optical coupler 11 connects the two ends of mixing optical fiber 10 of erbium/ytterbium; The two other ends of mixing optical fiber 10 of erbium/ytterbium link to each other with the public port of wavelength division multiplexer 9 again; 90% port of optical coupler 11 connects the arrival end of optical isolator 8; Optical isolator 8 ports of export are connected with the two ends of mixing optical fiber 7 of erbium/ytterbium; The two other ends of mixing optical fiber 7 of erbium/ytterbium are connected on the public port of wavelength division multiplexer 6; The 1550nm port of wavelength division multiplexer 6 connects the arrival end of optical isolator 3, and optical isolator 3 ports of export link to each other with the input port of variable optical attenuator 4, and the output port of variable optical attenuator 4 is as laser output mouth 5.More than connection between each part all adopt optical fiber to connect.
Pumping source 1 described in the technical scheme is that the splitting ratio that passes through that adopts is 35: 65 optical coupler 2 provides the 980nm pump light simultaneously for fiber laser and amplifier a 980nm pumping source.Described wavelength division multiplexer 6 is two 980/1550nm wavelength division multiplexers that structure is identical with wavelength division multiplexer 9.Described optical isolator 3, optical isolator 8 is three optical isolators that structure is identical with optical isolator 12.Described playing shortened the long erbium ytterbium that reduces noise contributions in chamber effectively two to mix the two optical fiber 10 of mixing of optical fiber 7 and erbium ytterbium is to adopt the erbium ytterbium weight concentration of optimizing (WT%) to be respectively 0.41% and 2.06% and the two optical fiber of mixing of erbium ytterbium made.
The operation principle of low noise tunable single frequency fiber laser for full-optical communication:
The pump light that 980nm pumping source 1 is sent is 35: 65 optical coupler 2 beam split through splitting ratio.65% pump light laser forms amplifier through the two optical fiber 7 of mixing of one section erbium/ytterbium of 980/1550nm wavelength division multiplexer 6 pumpings, input signal is entered by the two ends of mixing optical fiber 7 of erbium/ytterbium, output signal is exported through a variable optical attenuator 4 (so that tuning output output power of laser) from the 1550nm port output of wavelength division multiplexer 6.35% pump light is mixed optical fiber 10 and is formed amplified spont-aneous emission (ASE) by one section erbium/ytterbium of 980/1550nm wavelength division multiplexer 9 pumpings is two; In order to prevent that pump light from entering saturated absorbing body, adopt that erbium/ytterbium is two mixes back to ASE that optical fiber 10 sends, enter from the port one of optical circulator 13, after the port 2 of optical circulator 13 enters the reflection arm, select optical maser wavelength through one section Er-doped fiber 15 and optical fiber Bragg raster 16 as saturated absorbing body, the port 2 of reflected light circulator 13 is after the port 3 of optical circulator 13 is exported from optical circulator; Through fibre optic polarizer 14 to keep polarization stability, entering splitting ratio through optical isolator 12 is 10: 90 optical coupler 11, wherein 90% light output, 10% light enter the two optical fiber 10 of mixing of erbium/ytterbium again as feedback amplifies, and constantly forms positive feedback and produces laser resonance; The flashlight of laser output enters the amplifier amplification from the end of fiber amplifier, again through variable optical attenuator 4 outputs.
The performance structure analysis and test of low noise tunable single frequency fiber laser for full-optical communication is analyzed:
The laser that 980nm pumping source 1 is sent is that 35: 65 2 pairs of fiber lasers of optical coupler and amplifier carries out pumping simultaneously by splitting ratio.Circular cavity optic fibre laser and amplifier adopt all that erbium/ytterbium is two mixes optical fiber as gain media, and it has wide pump absorption bandwidth, exceeds the pump absorption intensity (representative value is 2dB/cm) of two magnitudes than common Er-doped fiber at the 980nm place.Mix in the optical fiber in that erbium/ytterbium is two, the low doping concentration of erbium ion avoided laser from pulse effects.980nm pump light behind optical coupler 2, wherein a part is coupled into the two optical fiber 10 formation laser gain structures of mixing of one section erbium/ytterbium by wavelength division multiplexer 9, end as the Er-doped fiber 15 of saturated absorbing body is connected on the port 2 of optical circulator 13, its other end is connected on the end as the tunable fiber grating 16 of narrowband reflection formula wavelength choice structure, along with the draw power increase has suppressed spontaneous radiation, select specific wavelength and resonance generation laser through the tunable fiber grating.Optical isolator 12 be used for suppressing noise and with the unidirectional running of optical circulator 13 common guarantee laser in annular chamber, improve zlasing mode stability.Fibre optic polarizer 14 can keep the transmission of a kind of polarization state light, makes that other polarization mode is effectively suppressed in the chamber.Select although adopted the narrow-band tunable fiber grating to carry out wavelength as reflection bandstop filter, tunable fiber grating also can only be as the roughly selecting of wavelength, and also will rely on the not saturated absorption effect of pump erbium-doped optical fiber for the selection of single longitudinal mode.The laser that circular cavity optic fibre laser produces enters the two optical fiber 7 of mixing of erbium/ytterbium as seed light after by optical isolator 8, the part of 980nm pump light enters the two optical fiber 7 of mixing of erbium/ytterbium by wavelength division multiplexer 6, realized that low noise seed light and pump light enter respectively from the optical fiber two ends, connecting low noise simple signal light into by tail optical fiber, fiber amplifier carries out the light pulse amplification.For the amplifying laser that prevents backscattering in the fibre core damages seed light source, seed light is carried out unidirectional isolation, adopt optical isolator 8 can prevent that residual pump light from entering seed light source, to realize effective protection to seed light source.By the inherent law that research optical-fiber laser moding and its high-frequency noise take place in real time, take to suppress the measure of its moding, thereby obtain low noise simple signal light.Utilize pump erbium-doped optical fiber not to make saturated absorbing body to obtain stable single-frequency laser output, adopt the tuning output wavelength of tunable fiber grating, the variable optical attenuator of integrated low insertion loss is to realize the adjustment of its Output optical power.Pumping when realizing fiber laser and amplifier by the optical coupler with specific splitting ratio the laser that pumping source sent, this structure is not appeared in the newspapers at home, has certain innovation.
Figure 2 shows that the composition frame chart of the test macro of the actual test of many speed of low noise tunable single frequency fiber laser for full-optical communication electric light external modulation characteristic.It comprises following critical piece or device:
Bit error analyzing instrument 4, it can produce the signal of telecommunication of specifying code check, acts on optical modulator 2 by driver module 3;
Annexation between them is: fiber laser 1 links to each other with optical modulator 2 optical fiber, optical modulator 2 links to each other with optical attenuator 7 optical fiber, optical attenuator 7 links to each other with receiver module 6 optical fiber, receiver module 6 links to each other with oscilloscope 5 or bit error analyzing instrument electric wire, bit error analyzing instrument 4 links to each other with driver module 3 electric wires, and driver module 3 electric wires connect by the optical modulator 2 of its driving.
Bit error analyzing instrument 4 can produce the signal of telecommunication of specifying code check, acts on optical modulator 2 by driver module 3, and optical modulator 2 can be modulated the laser that fiber laser 1 is produced, and obtains having the light signal of specifying code check, and making electrical signal conversion is light signal.Optical attenuator 7 can reduce the performance number of light signal, makes the optical signal value that enters receiver module 6 not too large, in order to avoid cause the damage of receiver module 6.Receiver module 6 can be converted to the signal of telecommunication with the light signal that receives, and the signal of telecommunication is sent in oscilloscope 5 or the bit error analyzing instrument.If 5 oscilloscopes then can observe the eye pattern of the signal of telecommunication by it; If 5 bit error analyzing instrument (substitute oscilloscope 5), then it and bit error analyzing instrument 4 can be formed a complete Error detection equipment, by it can observation system the error rate.If the output light signal of optical modulator 2 is sent in the oscilloscope, then can observe the eye pattern that sends light signal.Optical attenuator 7 can be changed to the G.652 monomode fiber that length is 21km to 84km, and the light signal of optical fiber output is sent in the oscilloscope, just can observe the eye pattern of light signal after light signal transmits through 21km to 84km under each code check.
Consult Fig. 2, adopt this test macro that the two-forty electrooptic modulation characteristic of the low noise tunable single frequency fiber laser for full-optical communication that the present invention developed has been carried out test analysis, for the present invention prepares in the product practicability of the communications field.Adopt many speed of 155Mbps to 10Gbps nonreturn to zero code external modulation, transmission range is 21km to 84km, carries out test transmission.Receive clock, associated transport figure and the Key Performance Indicators such as corresponding eye pattern waveform, the error rate and receiving sensitivity of measuring optical fiber laser each speed under the different distance transmission.Research electro-optic modulation system polarization transmission matrix, network analysis electrooptic modulation transmission system is to the conversion characteristics of laser polarization.Carry out the optimal design of this research, and even high-quality optical communication transmission system there is very important meaning to high speed full optical telecommunication optical fiber laser transmitter.
Figure 3 shows that the laser that low noise tunable single frequency fiber laser for full-optical communication sends, through after the external modulation, at the following transmission eye pattern of light signal (figure that on the oscilloscope screen, presents, below all with) of three sign indicating number speed (1.25Gbps, 2.488Gbps and 9.953Gbps).The transmission light signal eye pattern of three sign indicating number speed is all more satisfactory, meets the template requirement, and the opening width and the symmetry of light signal eye pattern of observing each yard speed from figure is all fine, and the position, crosspoint does not significantly descend.Because fiber laser is as principle prototype, imperfect on product technology, relative intensity noise is big slightly than ripe commercial product, along with the raising of signal code speed, because intersymbol interference, signal distortion reduce an aperture, " eyelid " thickness is increased.
Figure 4 shows that the receiving optical signals eye pattern of light signal after the transmission of 21km monomode fiber after the modulation.The 1.25Gbps that receives and the opening width and the symmetry of 2.488Gbps light signal eye pattern are still fine, and the trend that thickening appears in eyelid shows that its intensity noise raises along with the increase of transmission range.And the opening width of 9.95 3Gbps light signal eye patterns begins that downward trend is arranged, and symmetry is still fine, still can satisfy the requirement of communication.
Figure 5 shows that the receiving optical signals eye pattern of light signal after the transmission of 42km monomode fiber after the modulation.The 1.25Gbps that receives and the eye pattern effect of 2.488Gbps light signal are fine, can be competent at communicating requirement.But the eye pattern eyelid thickness of 9.953Gbps light signal further increases, and the crosspoint begins to move down, and eyelid begins to thicken, and opening width diminishes.Explanation occurred the phenomenon of optical pulse broadening behind the transmission 42km, but the laser that this moment, fiber laser produced is still satisfied the requirement of communication under high sign indicating number rate modulation.
Figure 6 shows that the receiving optical signals eye pattern of light signal after the transmission of 63km monomode fiber after the modulation.Behind the optical signal transmission 63km after the modulation, the eyelid thickness of 1.25Gbps and 2.488Gbps light signal eye pattern slightly thickens, but can keep opening width and symmetry preferably, can not impact substantially communication quality.And the eye opening of 9.953Gbps light signal reduces, and in the Lower Half of signal eye diagram, pulse stretching further strengthens in the crosspoint, and the transmission quality of this length is relatively poor.
Figure 7 shows that the receiving optical signals eye pattern of light signal after the transmission of 84km monomode fiber after the modulation.Behind the optical signal transmission 84km, 1.25Gbps can satisfy the basic demand of communicating by letter with the 2.488Gbps light signal, but because transmission range is long, and its signal power obviously descends, eyelid thickness increases.
From top practical test result as can be seen, the low noise tunable single frequency fiber laser for full-optical communication that the present invention developed, can satisfy the requirement of communication system, can be applied to fully in the optical communication, substitute the conventional semiconductor laser as the light source in the communication system.At home, the experimental study during fiber laser is applied to communicate by letter is also rarely found, and the work that the present invention did has certain innovation.
Claims (8)
1. low noise tunable single frequency fiber laser for full-optical communication, it is characterized in that described low noise tunable single frequency fiber laser for full-optical communication is mainly by pumping source (1), the splitting ratio that the laser that pumping source (1) is sent carries out pumping to fiber laser and amplifier simultaneously is 35: 65 a optical coupler (2), optical isolator (3), variable optical attenuator (4), wavelength division multiplexer (6), the two optical fiber (7) of mixing of erbium ytterbium, optical isolator (8), wavelength division multiplexer (9), the two optical fiber (10) of mixing of erbium ytterbium, splitting ratio is 10: 90 a optical coupler (11), optical isolator (12), optical circulator (13), fibre optic polarizer (14), Er-doped fiber (15), tunable fiber grating (16) is formed;
The output of pumping source (1) and splitting ratio are that the public port of 35: 65 optical coupler (2) links to each other; Splitting ratio is that 65% port of 35: 65 optical coupler (2) links to each other with the 980nm port of wavelength division multiplexer (6) and the 980nm port of wavelength division multiplexer (9) respectively with 35% port; The 1550nm port of wavelength division multiplexer (9) is connected on the port one of optical circulator (13); Er-doped fiber (15) as saturated absorbing body links to each other with tunable fiber grating (16) with the port 2 of optical circulator (13) respectively; The port 3 of optical circulator (13) connects an end of fibre optic polarizer (14), and fibre optic polarizer (14) other end links to each other with optical isolator (12) arrival end; Optical isolator (12) port of export is that the public port of 10: 90 optical coupler (11) links to each other with splitting ratio again; Splitting ratio is that 1 0% port of 10: 90 optical coupler (11) connects the two ends of mixing optical fiber (10) of erbium ytterbium; The two other ends of mixing optical fiber (10) of erbium ytterbium link to each other with the public port of wavelength division multiplexer (9) again; Splitting ratio is the arrival end that 90% port of 10: 90 optical coupler (11) connects optical isolator (8), and optical isolator (8) port of export is connected with the two ends of mixing optical fiber (7) of erbium ytterbium; The two other ends of mixing optical fiber (7) of erbium ytterbium are connected on the public port of wavelength division multiplexer (6); The 1550nm port of wavelength division multiplexer (6) connects the arrival end of optical isolator (3), optical isolator (3) port of export links to each other with the input port of variable optical attenuator (4), the output port of variable optical attenuator (4) is as laser output mouth 5, more than connection between each part all adopt optical fiber to connect.
2. according to the described low noise tunable single frequency fiber laser for full-optical communication of claim 1, it is characterized in that described pumping source (1) is to be 35: 65 optical coupler (2) provides the pump light of 980nm simultaneously for fiber laser and amplifier 980nm pumping source by splitting ratio.
3. according to the described low noise tunable single frequency fiber laser for full-optical communication of claim 1, it is characterized in that described wavelength division multiplexer (6,9) is two 980/1550nm wavelength division multiplexers that structure is identical.
4. according to the described low noise tunable single frequency fiber laser for full-optical communication of claim 1, it is characterized in that described optical isolator (3,8,12) is three optical isolators that structure is identical.
5. according to the described low noise tunable single frequency fiber laser for full-optical communication of claim 1, it is characterized in that described to shorten the two optical fiber (7,10) of mixing of the long erbium ytterbium that reduces noise in chamber effectively be to adopt the erbium ytterbium weight concentration of optimizing to be respectively 0.41% and 2.06% and the two optical fiber of mixing of erbium ytterbium made.
6. test macro of testing the described low noise tunable single frequency fiber laser for full-optical communication of claim 1, it is characterized in that described test macro is made up of fiber laser (1), optical modulator (2), driver module (3), bit error analyzing instrument (4), oscilloscope (5), receiver module (6), optical attenuator (7);
Fiber laser (1) links to each other with optical modulator (2) optical fiber, optical modulator (2) links to each other with optical attenuator (7) optical fiber, optical attenuator (7) links to each other with receiver module (6) optical fiber, receiver module (6) links to each other with oscilloscope (5) electric wire, bit error analyzing instrument (4) links to each other with driver module (3) electric wire, driver module (3) be connected by the optical modulator of its driving (2) electric wire.
7. according to the described test macro of claim 7, it is characterized in that described oscilloscope (5) also can be used instead and be the bit error analyzing instrument, the bit error analyzing instrument is that electric wire links to each other with receiver module (6).
8. according to claim 5 or 6 described test macros, it is characterized in that described fiber laser (1) is a low noise tunable single frequency fiber laser for full-optical communication, i.e. the tested optical fiber laser.
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