CN201075573Y - Full optical fiber wavelength division multiplexing tunable single frequency optical fiber array laser and testing system thereof - Google Patents
Full optical fiber wavelength division multiplexing tunable single frequency optical fiber array laser and testing system thereof Download PDFInfo
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- CN201075573Y CN201075573Y CNU2007200939759U CN200720093975U CN201075573Y CN 201075573 Y CN201075573 Y CN 201075573Y CN U2007200939759 U CNU2007200939759 U CN U2007200939759U CN 200720093975 U CN200720093975 U CN 200720093975U CN 201075573 Y CN201075573 Y CN 201075573Y
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Abstract
The utility model discloses an all-fiber WDM tunable single frequency fiber array laser and a test system thereof, aiming at solving the problem that high speed WDM system development cannot be met due to the broadening of spectral lines resulted from chirp effect caused by concentration change of free carrier in source area during the emission process of laser. The laser consists of a pumping source 1, a fiber coupler 2, a tunable matrix (3) and fiber grating F-P distribute Bragg reflection lasers (4, 5, ... , N+3 ) with peak wavelength respectively being Lambada 1, Lambada2, ... , Lambada N. The test system consists of a fiber laser (1), a modulator (2), a drive module (3), an error analyzer (4), an oscillograph or an error analyzer (5), a receiver module (6) and a light attenuator (7). The laser is applied to the field of high speed optical communication and optical fiber sensing and meets the transmission requirements of super high precision and super long distance; the test system can analyze the high speed electrooptical modulation characteristics of lasers.
Description
Technical field
The utility model relates to a kind of laser beam emitting device and a kind of service check device of full fiber optic communication field, in particular, relates to a kind of full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser 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 full fiber optic telecommunications equipment 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 research of full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser.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 literature search, do not see the patent report of relevant tunable single-frequency fiber array laser so far as yet.The domestic research report that pair erbium doped fiber laser is arranged, the fiber laser report of erbium and ytterbium codoping is less.Single mode narrow linewidth distributed Blatt reflective (DBR) fiber laser that the yellow civilian gain of department of physics of Chinese University of Science and Technology is made of erbium-ytterbium co-doped fiber, under the 980nm diode pumped, when draw power is 75mW, having obtained power output is the single-frequency laser of 2.3mW, its centre wavelength is 1557.524nm, live width is not seen patent application and mandate less than 5MHz.
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 optical-fiber laser technology is the new pattern laser technology that develops rapidly in recent years, the international in recent years especially focus advanced subject of 1550nm optical communicating waveband single frequency optical fiber laser.This is because this single frequency optical fiber laser has extremely wide application prospect in fields such as following optical communication and high-performance optical fiber sensor systems, is the important foundation components and parts of Mirae Corp.'s upgrading.In dense wave division multipurpose (DWDM) the dynamic all-optical communication network in future, all devices all will be fixed on integrated and its wavelength interval the integral multiple of 0.8nm, to meet the standard of the ITU-T of International Telecommunications Union.In network, only need to use a channel to remove to detect wavelength mismatch (Wavelength Misalignment) between general bureau (CO) and the remote node (Remote Node), carry out tuning Wavelength matched (alignment) that makes all devices to remedy the influence that environmental change causes device with a feedback loop.The live width of Ultrashort cavity high doping optical fiber laser can be done very narrowly.Therefore, also provide an opportunity for proposition of the present utility model.
The utility model content
Technical problem to be solved in the utility model is to overcome existing technical problem in the prior art, provides a kind of single-frequency low noise full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser.A kind of test macro of testing full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser also is provided simultaneously.
Consult Fig. 1, for solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved.Described full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser mainly is respectively λ by pumping source, fiber coupler, tunable matrix and peak wavelength
1, λ
2..., λ
nBe labeled as 4,5 ..., the fiber Bragg grating F-P chamber distributed Bragg reflection laser of N+3 is formed, wherein n and N are greater than zero natural number, below identical.
The output of pumping source is connected with the input end fiber of fiber coupler, and the N of a fiber coupler output is respectively λ with peak wavelength respectively
1, λ
2..., λ
nBe labeled as 4,5 ..., an end optical fiber of the fiber Bragg grating F-P chamber distributed Bragg reflection laser of N+3 connects, peak wavelength is respectively λ
1, λ
2..., λ
nBe labeled as 4,5 ..., the other end of the fiber Bragg grating F-P chamber distributed Bragg reflection laser of N+3 then, is respectively λ with peak wavelength as the output of full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser
1, λ
2..., λ
nBe labeled as 4,5 ..., the fiber Bragg grating F-P chamber distributed Bragg reflection laser of N+3 is equally spaced side by side to be fixed on the tunable matrix, forms to be respectively λ by peak wavelength
1, λ
2..., λ
nBe labeled as 4,5 ..., the laser array that the fiber Bragg grating F-P chamber distributed Bragg reflection laser of N+3 is formed.
Pumping source described in the technical scheme is to be that peak wavelength is respectively λ by fiber coupler
1, λ
2..., λ
nBe labeled as 4,5 ..., the fiber Bragg grating F-P chamber distributed Bragg reflection laser of N+3 provides the high power laser pumping source of pump light; Described fiber coupler is that the pump light with pumping source is transferred to peak wavelength and is respectively λ
1, λ
2..., λ
nBe labeled as 4,5 ..., 1 * N fiber coupler of the fiber Bragg grating F-P chamber distributed Bragg reflection laser of N+3 has an input port on it, N output port; Described peak wavelength is respectively λ
1, λ
2..., λ
nBe labeled as 4,5 ..., the fiber grating formation that the F-P chamber of the fiber Bragg grating F-P chamber distributed Bragg reflection laser of N+3 equates with a pair of central task wavelength that is produced on the optical fiber two ends by one section erbium-ytterbium co-doped fiber of optimizing length.
The design of the utility model major technique is on the basis of linear cavity laser, based on the rate equation theory, proposes the method for designing of brand-new single mode narrow linewidth distributed Blatt reflective fiber laser.Utilize coupled-mode theory and numerical method that the characteristic of laser is analyzed, and set up principle model in conjunction with OptiAmplifier optical-fiber laser design software it is carried out numerical simulation.Use different draw powers to calculate the erbium-ytterbium co-doped fiber of different levels of doping and length respectively, relatively laser threshold gain and longitudinal mode are composed, and it is long with the best chamber that provides the laser single-frequency operation to optimize its resonant cavity.The 980nm semiconductor laser is the pump short cavity fiber laser simultaneously, and laser is exported from the erbium-ytterbium co-doped fiber tail end through optical isolator, to eliminate the influence of light feedback to laser.Employing applies the output wavelength that axial strain changes the method tuning laser of its reflection wavelength to fiber grating.Whole optical fiber laser module is through careful adjusting resonant cavity and after carrying out shockproof sound insulation processing, make output laser have good single-frequency characteristic, be encapsulated into the one dimension photon integrated laser source that constitutes together based on the fiber Bragg grating F-P chamber, can be used for the DWDM System of all Optical Communication.The output laser spectroscopy is detected by the fibre optic spectral analyzer of resolution 0.07nm, carries out single-frequency with high-precision laser scanning F-P interferometer in conjunction with digital storage oscilloscope and detects and wire width measuring.Propose to realize the effective technology method of single-frequency laser output, the reason of its mode stability of analyzing influence also provides solution.Verify by experiment and theoretical analysis result, to laser power output characteristic such as its excitation wavelength, threshold value draw power, peak power outputs, parameters such as slope efficiency, longitudinal mode distribution character, frequency range are made testing research, and the internal relation of itself and each correlation technique parameter is launched research to optimize the structure parameter of laser array laser.
Compare with fiber laser in the past, the beneficial effects of the utility model are:
(1) this full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser and test macro thereof have single channel, two-way or multi-path laser output series of products, and the output laser channel is 0.8nm at interval, and every road laser output wavelength is 1.55 μ m, and tuning range is 4nm;
(2) as a kind of optical signal source of novel high-performance, can be used for high speed optical communication and sensory field of optic fibre, can satisfy the requirement of superhigh precision, overlength distance transmission;
(3) this full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser is specially adapted to wdm system, and its good performance can satisfy the requirement of system fully;
(4) because full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser has natural good radiating mode, so the power output of full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser is stable;
(5) owing to adopt all optical fibre structure mode, can realize the optical fiber coupling of real low insertion loss;
(6) this full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser adopts the modularized design of compact conformation, has reduced its cost of manufacture to greatest extent.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing:
Fig. 1 is the light path principle figure of full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser;
Among the figure: 1. pumping source, 2. fiber coupler, 3. tunable matrix, 4,5 ..., the N+3. peak wavelength is respectively λ
1, λ
2..., λ
nFiber Bragg grating F-P chamber distributed Blatt reflective (DBR) laser.
Fig. 2 is the composition frame chart to the test macro of the actual test of many speed electric light external modulation characteristic of full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser;
Among the figure: 1. fiber laser, 2. modulator, 3. driver module, 4. bit error analyzing instrument, 5. oscilloscope, 6. receiver module, 7. optical attenuator.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail:
Shown in Figure 1 is the light path principle figure of full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser.It comprises following main parts size:
High power laser pumping source 1 is λ by fiber coupler 2 for peak wavelength
1Fiber Bragg grating F-P chamber distributed Bragg reflection laser 4, peak wavelength is λ
2Fiber Bragg grating F-P chamber distributed Bragg reflection laser 5 ..., peak wavelength is λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser N+3 pump light is provided;
The fiber coupler 2 of 1 * N, being coupling in pumping source 1 is λ with peak wavelength
1Fiber Bragg grating F-P chamber distributed Bragg reflection laser 4, peak wavelength is λ
2Fiber Bragg grating F-P chamber distributed Bragg reflection laser 5 ..., peak wavelength is λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser N+3 between, it is λ that the pump light of pumping source 1 is transferred to peak wavelength
1Fiber Bragg grating F-P chamber distributed Bragg reflection laser 4, peak wavelength is λ
2Fiber Bragg grating F-P chamber distributed Bragg reflection laser 5 ..., peak wavelength is λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser N+3;
Peak wavelength is λ
1Fiber Bragg grating F-P chamber distributed Bragg reflection laser 4, peak wavelength is λ
2Fiber Bragg grating F-P chamber distributed Bragg reflection laser 5 ..., peak wavelength is λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser N+3, outwards export the laser of multi-wavelength tunable single-frequency.
Annexation between them is: high power laser pumping source 1 output is connected with fiber coupler 2 input port fiber of 1 * N, and N output port of the fiber coupler 2 of 1 * N is λ with peak wavelength respectively
1Fiber Bragg grating F-P chamber distributed Bragg reflection laser 4, peak wavelength is λ
2Fiber Bragg grating F-P chamber distributed Bragg reflection laser 5 ..., peak wavelength is λ
nThe end optical fiber of fiber Bragg grating F-P chamber distributed Bragg reflection laser N+3 connect, peak wavelength is λ
1Fiber Bragg grating F-P chamber distributed Bragg reflection laser 4, peak wavelength is λ
2Fiber Bragg grating F-P chamber distributed Bragg reflection laser 5 ..., peak wavelength is λ
nThe other end of fiber Bragg grating F-P chamber distributed Bragg reflection laser N+3 as the output of full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser.Then, be λ with peak wavelength
1Fiber Bragg grating F-P chamber distributed Bragg reflection laser 4, peak wavelength is λ
2Fiber Bragg grating F-P chamber distributed Bragg reflection laser 5 ..., peak wavelength is λ
nEqually spaced side by side being fixed on the tunable matrix 3 of fiber Bragg grating F-P chamber distributed Bragg reflection laser N+3, forming by peak wavelength is λ
1Fiber Bragg grating F-P chamber distributed Bragg reflection laser 4, peak wavelength is λ
2Fiber Bragg grating F-P chamber distributed Bragg reflection laser 5 ..., peak wavelength is λ
nThe laser array formed of fiber Bragg grating F-P chamber distributed Bragg reflection laser N+3.
Among Fig. 1,4,5 ..., N+3 is that peak wavelength is respectively λ
1, λ
2..., λ
nFiber Bragg grating F-P chamber distributed Blatt reflective (DBR) laser, the fiber grating formation that the F-P chamber of each fiber Bragg grating F-P chamber distributed Blatt reflective (DBR) laser equates with a pair of central task wavelength that is produced on the optical fiber two ends by one section erbium-ytterbium co-doped fiber of optimizing length.High power laser pumping source 1 is through the fiber coupler 2 of a 1 * N, and the peak wavelength of pumping simultaneously is λ
1Fiber Bragg grating F-P chamber distributed Bragg reflection laser 4, peak wavelength is λ
2Fiber Bragg grating F-P chamber distributed Bragg reflection laser 5 ..., peak wavelength is λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser N+3.Because the narrow reflection bandwidth and the high reflectance of fiber grating, the single-frequency laser of a narrow linewidth is exported in each F-P cavity oscillations.All equally spaced side by side being fixed on the tunable matrix 3 of fiber Bragg grating F-P chamber distributed Blatt reflective (DBR) laser, make its together with tunable matrix 3 by tuning, and tuning degree is identical, promptly adjacent wavelength interval is constant.Whole laser array laser completes by special package technology.
Figure 2 shows that the composition frame chart of test macro of the actual test of many speed electric light external modulation characteristic of full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser.This test macro comprises following critical piece or device:
Bit error analyzing instrument 4, it can produce the signal of telecommunication of specifying code check, acts on modulator 2 by driver module 3;
Another design is that oscilloscope 5 can be used the bit error analyzing instrument instead, if 5 when being the bit error analyzing instrument, then it and bit error analyzing instrument 4 can be formed a complete Error detection equipment, by it can observation system the error rate;
Annexation between them is: fiber laser 1 links to each other with modulator 2 optical fiber, 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 link to each other by the modulator 2 of its driving.
Bit error analyzing instrument 4 can produce the signal of telecommunication of specifying code check, acts on modulator 2 by driver module 3, and 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 is oscilloscope, then can observe the eye pattern of the signal of telecommunication by it; If 5 be the bit error analyzing instrument, 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 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 the two-forty electrooptic modulation characteristic of the full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser that this test macro develops the utility model to carry out test analysis, for the utility model is prepared 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.
Claims (4)
1. full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser, it is characterized in that described full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser mainly is respectively λ by pumping source (1), fiber coupler (2), tunable matrix (3) with peak wavelength
1, λ
2..., λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser (4,5 ..., N+3) form, wherein n and N are greater than zero natural number, below identical;
The output of pumping source (1) is connected with the input end fiber of fiber coupler (2), and N output of fiber coupler (2) is respectively λ with peak wavelength respectively
1, λ
2..., λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser (4,5 ..., N+3) an end optical fiber connects, peak wavelength is respectively λ
1, λ
2..., λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser (4,5 ..., N+3) the other end then, is respectively λ with peak wavelength as the output of full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser
1, λ
2..., λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser (4,5 ..., N+3) equally spaced side by side being fixed on the tunable matrix (3) forms and to be respectively λ by peak wavelength
1, λ
2..., λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser (4,5 ..., the N+3) laser array of Zu Chenging.
2. according to the described full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser of claim 1, it is characterized in that described pumping source (1) is to be respectively λ by fiber coupler (2) for peak wavelength
1, λ
2..., λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser (4,5 ..., N+3) provide the high power laser pumping source of pump light.
3. according to the described full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser of claim 1, it is characterized in that described fiber coupler (2) is that the pump light with pumping source (1) is transferred to peak wavelength and is respectively λ
1, λ
2..., λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser (4,5 ..., 1 * N fiber coupler N+3) has an input port on it, N output port.
4. according to the described full optical fibre wavelength-division multiplex tunable single-frequency fiber array laser of claim 1, it is characterized in that described peak wavelength is respectively λ
1, λ
2..., λ
nFiber Bragg grating F-P chamber distributed Bragg reflection laser (4,5 ..., the fiber grating formation that F-P chamber N+3) equates with a pair of central task wavelength that is produced on the optical fiber two ends by one section erbium-ytterbium co-doped fiber of optimizing length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200939759U CN201075573Y (en) | 2007-06-28 | 2007-06-28 | Full optical fiber wavelength division multiplexing tunable single frequency optical fiber array laser and testing system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200939759U CN201075573Y (en) | 2007-06-28 | 2007-06-28 | Full optical fiber wavelength division multiplexing tunable single frequency optical fiber array laser and testing system thereof |
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| Publication Number | Publication Date |
|---|---|
| CN201075573Y true CN201075573Y (en) | 2008-06-18 |
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|---|---|---|---|
| CNU2007200939759U Expired - Fee Related CN201075573Y (en) | 2007-06-28 | 2007-06-28 | Full optical fiber wavelength division multiplexing tunable single frequency optical fiber array laser and testing system thereof |
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| Country | Link |
|---|---|
| CN (1) | CN201075573Y (en) |
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Granted publication date: 20080618 Termination date: 20110628 |