CN102075249A - Device for processing nonlinear information of magnet adjustable optical fiber - Google Patents
Device for processing nonlinear information of magnet adjustable optical fiber Download PDFInfo
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- CN102075249A CN102075249A CN2010105724552A CN201010572455A CN102075249A CN 102075249 A CN102075249 A CN 102075249A CN 2010105724552 A CN2010105724552 A CN 2010105724552A CN 201010572455 A CN201010572455 A CN 201010572455A CN 102075249 A CN102075249 A CN 102075249A
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Abstract
The invention relates to a device for processing nonlinear information of a magnet adjustable optical fiber, comprising an optical information input transforming unit and an optical information output transforming unit. The device is characterized in that a magneto-optical nonlinear fiber unit is connected between the optical information input transforming unit and the optical information output transforming unit, wherein the magneto-optical nonlinear fiber unit comprises a magneto-optical nonlinear fiber and a magnet adjustable control module, the magneto-optical nonlinear fiber is wound round the magnet adjustable control module and is influenced by a magnetic field generated by the magnet adjustable control module, so as to control the transmission characteristics of the guided optical waves in the magneto-optical nonlinear fiber. The device provided by the invention has the following beneficial effects: the magneto-optical nonlinear fiber can be used for processing the optical information and the magnetic field sensor information.
Description
Technical field
The invention belongs to technical field of optical fiber communication, relate in particular to the intelligent optical information processing technology of magneto optical effect and fiber nonlinear effect coupling.
Background technology
Along with the fast development of Fibre Optical Communication Technology, the arrival of Fiber to the home (FTTH) and the integration of three networks, at a high speed, intelligence all-optical network become the vital developing direction of optical communication field, require optical information processing to have dynamic, intelligent feature.Yet light signal can be subjected to influence of various factors, for example in the accumulation of GVD (Group Velocity Dispersion), amplifier noise and the channel or the crosstalking mutually etc. of interchannel.In order to overcome the deterioration to light signal of these factors, the raising transmission quality need adopt full light 3R regeneration (amplification again, timing, shaping more again) technology in transmission course, can also overcome potential " electronic bottleneck " phenomenon that exists in the signal of telecommunication processing simultaneously.
Optical fiber has the irreplaceable superiority of other medium, and its transmission bandwidth scope is big, antijamming capability is strong, transmission capacity is big.The nonlinear effect of optical fiber, comprise from phase modulated (SPM), cross-phase modulation (XPM), Kerr effect (Kerr), four wave mixing (FWM), nonlinear birefringence etc. having penetrated into numerous areas such as optical fiber communication, Fibre Optical Sensor and optical information processing, be used to realize multiple functions such as wavelength Conversion, light pulse compression, full light 3R regeneration.The research of highly nonlinear optical fiber mainly concentrates on the raising non linear coefficient, reduces pumping light power, shortens optical fibre device length, optimizes optical fiber dispersion, reduces polarization mode dispersion aspects such as (PMD), promoted development based on the full light Intelligent Information Processing device of nonlinear fiber, therefore, utilize the nonlinear effect of optical fiber to make nonlinear optical fiber.
On the other hand, magneto optical effect (Magneto-optical effect) is meant the various optical phenomenas that take place between the material that is in magnetized state and the light to interact and cause.Comprise Faraday effect, Kerr magnetooptical effect, Zeemen effect and Cotton-Mouton effet etc.These effects all originate from the magnetization of material, have reflected getting in touch between light and changing of magnetism.Material such as the terbium (Tb) with high magneto optical effect that mix in optical fiber forms the magneto-optic optical fiber with magneto optical effect, and the magnetic controllable characteristics of magneto-optic optical fiber provides important means for carrying out the processing of novel intelligent photon information.At present, magneto-optic optical fiber is mainly used in full optical-fiber current (voltage) transducer, fibre optic magnetic field sensor and magneto-optic shutter etc.
The paper that the present inventor delivered at " photon journal " in October, 2010 " the nonlinear propagation characteristic research of light pulse in the magneto-optic optical fiber " proposed " perturbation theory of magneto optical effect and nonlinear effect in according to optical fiber; the nonlinear coupling mode equations of light pulse in the magneto-optic optical fiber of having derived; compared the time domain and the frequency domain processing scheme of magneto optical effect in the substep Fourier algorithm of revising; shown under the enough little situation of step-length; the unanimity as a result of two kinds of schemes. analyzed magneto optical effect; nonlinear fiber and chromatic dispersion are to the influence of optical pulse propagation characteristic, by changing the magneto-optic stiffness of coupling, control impuls shape flexibly not only, can also change the non-linear frequency chirp size that causes, help to realize dynamic shaping feature based on optical pulse broadening.The applicant thinks, according to this piece paper, can make a kind of optical fiber that has nonlinear effect and magneto optical effect simultaneously by the dopant that changes optical fiber, this paper abbreviates magneto-optic nonlinear optical fiber (Magneto-optical Nonlinear Fiber as, MNLF), utilize this magneto-optic nonlinear optical fiber can carry out optical information processing and magnetic field sensing information processing, adopt this novel magneto-optic nonlinear optical fiber not only can realize the shaping of light pulse, functions such as compression, can also be connected with the Networks of Fiber Communications device is convenient, be a kind of simple, practical, the easy scheme that realizes, its magnetic is adjustable, the flexible and controllable characteristic has satisfied intelligent development of Photonic Network demand, is with a wide range of applications.In addition, the applicant does not retrieve other the relevant magneto-optic nonlinear optical fiber and the documents and materials of related application thereof.
Summary of the invention
The objective of the invention is the magneto-optic nonlinear optical fiber to be carried out the adjustable processing of magnetic, provide a kind of magnetic adjustable nonlinear fiber information processor in order to realize.
In order to realize this purpose, technical scheme of the present invention is: the nonlinear fiber information processor that a kind of magnetic is adjustable, comprise optical information input converter unit, optical information output transform unit, its feature in, between optical information input converter unit and optical information output transform unit, be connected with magneto-optic nonlinear optical fiber unit, described magneto-optic nonlinear optical fiber unit comprises magneto-optic nonlinear optical fiber and magnetic adjustable control module, described magneto-optic nonlinear optical fiber be wrapped on the magnetic adjustable control module and the influence that is subjected to the magnetic field that magnetic adjustable control module produces in order to the guided wave light-transfer characteristic in the control magneto-optic nonlinear optical fiber.
Above-mentioned magnetic adjustable control module comprises solenoid and magneto-optic nonlinear optical fiber, and described magneto-optic nonlinear optical fiber is positioned at solenoidal central through hole.
Above-mentioned magnetic adjustable control module comprises skeleton, rotary-tray, cover plate and coiling, described skeleton is a cylinder, its center has a coiling hole, has an annular chamber between the outer wall of coiling hole and skeleton, described annular chamber is divided into skeleton in skeleton outer shroud and the skeleton and encircles, and has a breach that runs through the skeleton outer shroud vertically on the skeleton outer shroud; The pallet axle that described rotary-tray has a hollow is used for rotary-tray is sleeved on ring in the skeleton, at least one end in the two ends of described rotary-tray is equipped with the pallet covering of the fan and stirs to end coiling and is used for automatic or manual rotation rotary-tray, described rotary-tray is sleeved in the skeleton of skeleton ring and goes up and be positioned at annular chamber, and described cover plate has with corresponding cover plate coiling hole and the cover plate breach of the breach of coiling hole and skeleton outer shroud and is installed on the end face of skeleton; The coiling hole is passed in coiling and cover plate coiling hole formation coil is wrapped on the skeleton.
The invention has the beneficial effects as follows: the present invention has proposed the adjustable nonlinear fiber information processor of a kind of magnetic according to the magneto optical effect of magneto-optic nonlinear optical fiber and the coupling of fiber nonlinear effect, can utilize the magneto-optic nonlinear optical fiber to carry out optical information processing and magnetic field sensing information processing, effectively realized the adjustable processing of the magnetic of magneto-optic nonlinear optical fiber, therefore this device not only can be realized the shaping of light pulse, functions such as compression, can also be connected with the Networks of Fiber Communications device is convenient, be a kind of simple, practical, the easy scheme that realizes, and its magnetic is adjustable, the flexible and controllable characteristic has satisfied intelligent development of Photonic Network demand, is with a wide range of applications.
Description of drawings
Fig. 1 is the adjustable nonlinear fiber information processor theory diagram of magnetic.
Fig. 2 makes the structural representation of the solenoid scheme of magnetic adjustable control module of the present invention.
Fig. 3 is the three-dimensional assembling explosion schematic diagram of the torus organization plan of magnetic adjustable control module of the present invention.
Fig. 4 is the three-dimensional assembling schematic diagram of the torus organization plan of magnetic adjustable control module of the present invention.
Fig. 5 is the plane graph that skeleton of the present invention is observed from axial B direction.
Fig. 6 is the schematic cross-section of Fig. 4.
Fig. 7 is the generalized section of the A-A direction of Fig. 6.
Fig. 8 is the adjustable regenerative process schematic diagram of the magnetic of light pulse frequency spectrum of the present invention.
Fig. 9 is the shaping effect schematic diagram of high non-linearity magneto-optic optical fiber of the present invention.
Figure 10 is the Sagnac structural representation of magneto-optic optical fiber of the present invention.
Figure 11 is wavelength of the present invention and the pulse power variation tendency schematic diagram with magnetic field.
Description of reference numerals: ring 212, annular chamber 213, breach 214, coiling hole 215, rotary-tray 22, pallet axle 221, pallet covering of the fan 222 in optical information input converter unit 1, magneto-optic nonlinear optical fiber unit 2, skeleton 21, skeleton outer shroud 211, the skeleton, stir only coil 223, cover plate 23, cover plate breach 231, cover plate coiling hole 232, magneto-optic nonlinear optical fiber 24, coiling 25, solenoid 26, bearing 27, optical information output transform unit 3.
Embodiment
The present invention is described further below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the nonlinear fiber information processor that a kind of magnetic is adjustable, comprise optical information input converter unit 1, optical information output transform unit 3, its feature in, between optical information input converter unit 1 and optical information output transform unit 3, be connected with magneto-optic nonlinear optical fiber unit 2, described magneto-optic nonlinear optical fiber unit 2 comprises magneto-optic nonlinear optical fiber and magnetic adjustable control module, described magneto-optic nonlinear optical fiber be wrapped on the magnetic adjustable control module and the influence that is subjected to the magnetic field that magnetic adjustable control module produces in order to the guided wave light-transfer characteristic in the control magneto-optic nonlinear optical fiber.Magneto-optic nonlinear optical fiber unit 2 is based on the nonlinear effect of magneto-optic optical fiber, adopts magnetic tunable characteristic control impuls frequency chirp, realizes the conversion to optical pulse shape, and practical plan is simple, and flexible operation is controlled, have wide range of applications.At first, produce required light pulse signal at optical information input converter unit (1), it is transmitted into magneto-optic nonlinear optical fiber unit (2), utilize fiber nonlinear effect to make the variation of light pulse generation energy, polarization state, amplitude or phase spectrum, and control the performance of fiber nonlinear effect by adjusting magnetic field, magnetic adjustable control unit (3); At last, according to the optical information processing function that will realize, after handling, light filtering, light amplification or wavelength Conversion etc. export by optical information output transform unit (4).
Optical information input converter unit 1 major function is to finish the optical information adaption function, changes electricity or light signal (continuous wave or pulse) into can carry out magneto-optic and the non-linear effect of intercoupling in magneto-optic nonlinear optical fiber unit information format.Main devices comprises light source, modulator, image intensifer, optical fiber coupling, Polarization Controller and other additional device (not shown) etc., generally generally adopt external modulator that the signal of telecommunication is loaded into and obtain light modulated output on the light source, also can adopt internal modulation as the case may be.In addition, magneto optical effect and nonlinear coupling cause the guided wave polarization state to change, and the influence of different polarization states paired pulses can be realized by Polarization Controller (PC).By the form of conversion input optical signal, for example be modulated into chirped pulse, high power pulse etc., can finish the information processing of multiple function.Optical information input converter unit 1 can be the multiple combination of multiple existing device, is regarded as prior art in the present invention, therefore is not described in detail.
Magneto-optic nonlinear optical fiber unit 2 major functions are to make light signal (comprising continuous light, various light pulses etc.) that non-linear coupling take place in magneto-optic optical fiber, can realize the magneto-optic nonlinear optical information processing function by the interference or the non-interference structure that make up various ways, as warble from phase place or cross-phase modulation, four wave mixing, polarization converted, light frequency, pulse compression etc.The magneto-optic nonlinear optical fiber has related to the coupling between optical fiber dispersion (D), magneto optical effect (MO), the nonlinear fiber several physical such as (NL).The synergy of GVD (Group Velocity Dispersion) (GVD) and nonlinear effect has obtained broad research, for example light pulse compression, optical soliton etc.The present invention is based on the interactional new mechanism of GVD, nonlinear effect and magneto optical effect, thereby its coupling can be regulated by the magnetic control mode.Magneto optical effect causes the polarization converted of non-linear coupling light in the magneto-optic optical fiber, and the speed of its conversion can be measured by the magneto-optic coupling coefficient, and the product of available Verdet constant and magnetic flux density is represented.The present invention has also considered the coupled relation of linear birefrigence and magneto optical effect, suitably controls the size of magneto optical effect, and the equivalent birefringence effect of whole system is changed, and comprises the influence of nonlinear birefringence, thereby reaches the effect of magnetic control nonlinear effect.
Magnetic adjustable control module major function in the magneto-optic nonlinear optical fiber unit 2 is to finish the controlled function of externally-applied magnetic field to fiber nonlinear effect, magnetic adjustable control module is driven by the drive circuit of outside and produces magnetic field, the magneto-optic nonlinear optical fiber be wrapped on the magnetic adjustable control module and the influence that is subjected to the magnetic field that magnetic adjustable control module produces in order to the guided wave light-transfer characteristic in the control magneto-optic nonlinear optical fiber.Root magnetic adjustable control module specific implementation structure has multiple, can select multiple organization plans such as torus, solenoid, permanent magnet, electromagnet and pulsed magnetic field.Wherein, torus then is at close helical coil on annulus, the ring in can the generation magnetic field, according to breadboard measurement greatly between 0.01T～0.1T; Solenoid structure produces magnetic field can be divided into air core coil and iron-core coil magnetic circuit, and it has the magnetic field of generation more even, and producing magnetic field range is 0.01T～0.5T magnitude; Permanent magnet also can produce the magnetic field in the general 0.1T scope, notes the uniformity of Distribution of Magnetic Field; The magnetic field that electromagnet produces is bigger, needs sometimes coil is loaded water cooling plant; Pulsed magnetic field can produce very big magnetic field (being about the 10T magnitude), but the duration is shorter.When carrying out big current field sensing, also can adopt the mode of dc wire to add loaded magnetic field.
Selecting torus organization plan and solenoid structure scheme below is that the different embodiment of magnetic adjustable control module are described in detail.
Embodiment 1: be illustrated in figure 2 as the magnetic adjustable control module of spiral rings scheme, described magnetic adjustable control module comprises solenoid 26 and magneto-optic nonlinear optical fiber 24, and described magneto-optic nonlinear optical fiber 24 is positioned at the central through hole of solenoid 26.Solenoid 26 is meant the coil that turns to cylindrical shape or other shape with coiling 25 (adopting enamel covered wire usually), can produce magnetic field after the energising.From an end of solenoid 26 magneto-optic nonlinear optical fiber 24 is slowly passed solenoid, pass from the other end of solenoid; Then, magneto-optic nonlinear optical fiber 24 is carried out this operation more repeatedly behind a circle, be required length up to the magneto-optic nonlinear optical fiber 24 that is wound into solenoid 26.Like this, magneto-optic nonlinear optical fiber 24 can pass solenoidal axle center round and round, as shown in Figure 4.
Though the magnetic adjustable control module of present embodiment can be implemented the solution of the present invention, because in installation process, if the angle too small of fibre-optical bending, bending loss can be very serious, influences the optical information processing effect.In addition, because solenoid 26 is longer, the installation of present embodiment 1 is not easy to operate, and need pass solenoid more than 26 time.
The nonlinear fiber information processor that magnetic according to claim 1 is adjustable, described magnetic adjustable control module comprises skeleton 21, rotary-tray 22, cover plate 23 and winds the line 25, described skeleton 21 is a cylinder, its center has a coiling hole 215, has an annular chamber 213 between the outer wall of coiling hole 215 and skeleton 21, described annular chamber 213 is divided into skeleton 21 in skeleton outer shroud 211 and the skeleton and encircles 212, has a breach 214 that runs through skeleton outer shroud 211 vertically on skeleton outer shroud 211; The pallet axle 221 that described rotary-tray 22 has a hollow is used for rotary-tray 22 is sleeved on ring 212 in the skeleton, at least one end in the two ends of described rotary-tray 22 is equipped with pallet covering of the fan 222 and stirs and only coils 223 and be used for automatic or manual rotation rotary-tray 22, described rotary-tray 22 is sleeved in the skeleton of skeleton 21 on the ring 212 and is positioned at annular chamber 213, and described cover plate 23 has with the breach 214 corresponding cover plates coiling hole 232 and the cover plate breach 231 of coiling hole 215 and skeleton outer shroud 211 and is installed on the end face of skeleton 21; Coiling hole 215 is passed in coiling 25 and cover plate coiling hole 232 formation coils are wrapped on the skeleton 21.
Above-mentioned skeleton 21, rotary-tray 22 and cover plate 23 adopt non-magnetic material such as metallic aluminium or nichrome, and its concrete structure can adopt mechanical means to form.
Embodiment 2: as Fig. 3, Fig. 4, Fig. 5, Fig. 6 and shown in Figure 7, the nonlinear fiber information processor that magnetic according to claim 1 is adjustable, described magnetic adjustable control module comprises skeleton 21, rotary-tray 22, cover plate 23 and winds the line 25, described skeleton 21 is a cylinder, its center has a coiling hole 215, has an annular chamber 213 between the outer wall of coiling hole 215 and skeleton 21, described annular chamber 213 is divided into skeleton 21 in skeleton outer shroud 211 and the skeleton and encircles 212, has a breach 214 that runs through skeleton outer shroud 211 vertically on skeleton outer shroud 211; The pallet axle 221 that described rotary-tray 22 has a hollow is used for rotary-tray 22 is sleeved on ring 212 in the skeleton, at least one end in the two ends of described rotary-tray 22 is equipped with pallet covering of the fan 222 and stirs and only coils 223 and be used for automatic or manual rotation rotary-tray 22, described rotary-tray 22 is sleeved in the skeleton of skeleton 21 on the ring 212 and is positioned at annular chamber 213, and described cover plate 23 has with the breach 214 corresponding cover plates coiling hole 232 and the cover plate breach 231 of coiling hole 215 and skeleton outer shroud 211 and is installed on the end face of skeleton 21; Coiling hole 215 is passed in coiling 25 and cover plate coiling hole 232 formation coils are wrapped on the skeleton 21.
Above-mentioned skeleton 21, rotary-tray 22 and cover plate 23 adopt non-magnetic material such as metallic aluminium or nichrome, and its concrete structure can adopt mechanical means to form.
Also having bearing 27 between encircling 212 in the skeleton of above-mentioned rotary-tray 22 and skeleton 21 uses so that rotary-tray 22 can rotate by the interior ring 212 of better relative skeleton as plain ball bearing or ultra-thin bearing.
Adopt the magnetic adjustable control module of said structure, magneto-optic nonlinear optical fiber 4 is wrapped on the pallet axle 21 of rotary-tray 2, the coiling hole 15 that will wind the line simultaneously (adopting enamel covered wire usually) passes skeleton 1 is wrapped on the outer wall of skeleton and is used to the magneto-optic nonlinear optical fiber that externally-applied magnetic field is provided.Its specific operation process is as follows:
1) rotary-tray 2 of packing in skeleton 1 is enclosed within rotary-tray 2 in the skeleton of skeleton 1 on the ring 12, and detects rotary-tray 2 and whether can stir rotation, covers cover plate 3;
2) coiling (adopting enamel covered wire usually) is uniformly twined in the coiling hole 15 of passing skeleton 1 on the skeleton 1 of no soft magnetic material, and this winding structure is called as torus, passes to electric current in the coiling and can produce externally-applied magnetic field;
3) load onto the bearing (not shown) that is used for fixing the torus coil, it can be fixed on the table;
4) breach 14 of magneto-optic nonlinear optical fiber 4 one ends from skeleton 1 stretched into, be fixed on the rotary-tray 2, breach from the skeleton 1 14 rotates rotary-trays 2 again, magneto-optic nonlinear optical fiber 4 is brought in the rotary-tray 2, like this one encloses repeatedly and carries out, and is required length up to the optical fiber that is wound into rotary-tray 2.
The further specific requirement of the concrete structure of above-mentioned magnetic adjustable control module is as follows:
Fig. 6 provides the sectional view that Fig. 4 assembles the result, and Fig. 7 is the profile along the A-A direction, notices that this moment, the A-A direction was a vertical direction.
(1) skeleton 21/ rotary-tray 22: skeleton 21/ pallet material requires not influence the torus internal magnetic field and distributes, and sturdy and durable; In rotary-tray 22 both sides equally distributed pallet covering of the fan 222 is arranged;
(2) bearing 27 adopts swing roller or ultra-thin bearing: swing roller/ultra-thin bearing rotates design for the ease of rotary-tray 22, requires simple and durable, can reduce the rotary-tray rotary resistance;
(3) annular chamber 213: must can be convenient to put into simultaneously rotary-tray 22, and it is not produced obstruction when rotary-tray 22 slides;
(4) concrete parameter designing:
Rotary-tray 22 parameters: rotary-tray 22 radius Rs (as Fig. 6) 〉=7 centimetre (this parameter can according to the correct of Magnetic Field Design needs); Rotary-tray 22 width D (as Fig. 6) 〉=5 centimetre; Pallet covering of the fan 22 height d (as Fig. 7) 〉=3 centimetres;
Breach 214: on skeleton outer shroud 211, will open width K (as Fig. 6)=2～3 centimetre breach;
The magnetic field size: radius 9cm place (be rotary-tray 22 near), annular chamber 213 internal magnetic field B (as Fig. 7) can reach 50mT, and are evenly distributed.
Optical information output transform unit 3 is the application according to required realization, carries out subsequent treatment by the combination in any of photoelectric devices such as optical filter, optical limiter, wavelength shifter, photodetector, finishes the output function of optical information.For example, can carry out the shaping of light pulse, wavelength conversion and light pulse compression etc. to the video stretching light pulse that magneto-optic nonlinear optical fiber unit 2 causes.As an example, several functions according to this device is realized, can adopt following scheme:
1) if will realize light pulse shaping again, should adopt the band pass filter in the optical filter;
2) if will realize the wavelength Conversion function, single wavelength Conversion also can adopt band pass filter, and the dual wavelength conversion can be selected high pass filter or dual band pass filter for use, and their wavelength relationship size is λ
1=λ
0+ Δ λ, λ
2=λ
0-Δ λ, wherein λ
0Be the centre wavelength of input pulse, λ
1And λ
2Be the new wavelength that produces; They also can use separately in actual applications.The decay of optical signal power can adopt light amplification to compensate;
3) if will realize the light pulse compression function, can adopt, also can adopt other nonlinear device by band pass filter.
In addition, utilize the controllable characteristics of the adjustable unit of magnetic in the patent of the present invention, just can make filter center wavelength alignment in the optical information output transform unit 3 by regulating externally-applied magnetic field, thereby realize the adjustable nonlinear fiber information processing of magnetic, and need not to use tunable filter, reduced the requirement of corresponding light device.Optical information output transform unit 3 can be the multiple combination of multiple existing device, is regarded as prior art in the present invention, therefore is not described in detail.
Finish the installation of magneto-optic nonlinear optical fiber 4 and coiling according to the scheme of the foregoing description 1 and embodiment 2 after, making current can produce externally-applied magnetic field.The nonlinear fiber information processor that magnetic of the present invention is adjustable just can have been worked.
Scheme with embodiment 2 is an example below, and the different application example by this embodiment 2 comes that the present invention is described further.
Application example one, to be used for the shaping of light pulse with the adjustable nonlinear fiber information processor of magnetic be example, its concrete course of work is as follows: producing pulse duration by signal generator is the Gaussian pulse signal of 10ps, and the modulated laser light source can produce the Gauss light pulse and (establish central wavelength lambda
0=1550nm), (1530nm～1565nm), use erbium-doped fiber amplifier (EDFA) can make its Output optical power in the whole C wavelength band up to 500mW.The Gauss light pulse of deterioration is through the magneto-optic nonlinear optical fiber under the magnetic adjustable control unit biasing, and the spectral shape of its output optical pulse changes and can observe by spectrometer.Regulate externally-applied magnetic field, the filter center wavelength is alignd with the frequency chirp peak value of light pulse, thereby realize the regeneration of light pulse.At last, through fiber amplifier, obtain the pulse shape after the shaping, detailed process as shown in Figure 8.
Under the acting in conjunction of magneto optical effect and nonlinear fiber, the frequency spectrum generation broadening of light pulse, its peak can be controlled by externally-applied magnetic field.Consider the situation of the x linearly polarized light input of deterioration, its shaping effect as shown in Figure 9.Described by magneto-optic nonlinear optical fiber unit (2), under the combined regulating of magneto optical effect and nonlinear fiber, the pulse frequency spectrum broadening reaches shaping effect through filtering again.Therefore, the control action of magneto optical effect paired pulses spectral shape in the magneto-optic nonlinear optical fiber, by regulating the power of externally-applied magnetic field, the control impuls shape is optimized shaping effect flexibly.
Application example two, to be used for the Sagnac interference structure with the adjustable nonlinear fiber information processor of magnetic be example, as shown in figure 10, provided the magneto-optic nonlinear optical fiber unit that adopts the Sagnac interference structure among the figure, and its structure chart as shown in figure 10.
Among the present invention, the Sagnac interference structure is combined with the magneto-optic nonlinear optical fiber, can realize functions such as modulator novel, that magnetic is controlled and optical switch.The full optical fiber Sagnac of the magneto-optic that the present invention provides structure, form by one section magneto-optic nonlinear optical fiber that is wrapped in the torus, the torus device solves provide the problem of axial magnetic field to long-distance optical fiber, the magnetic tunable characteristic that it not only has also can change the influence of nonlinear effect paired pulses.With magneto-optic nonlinear optical fiber Sagnac similar, the magneto-optic nonlinear optical fiber also can combine with other interference structure, thereby further improves the performance of magneto-optic nonlinear optical fiber unit.
Application example three, to be used for magnetic field sensing with the adjustable nonlinear fiber information processor of magnetic be example, as shown in figure 11, set forth of the application of magneto-optic nonlinear optical fiber in the magnetic field sensing field, under the acting in conjunction of magneto optical effect and fiber nonlinear effect, the rule that the variation of externally-applied magnetic field causes wave length shift as shown in figure 11.The present invention causes the principle of nonlinear fiber frequency drift according to externally-applied magnetic field, adopts magneto-optic optical fiber such as mixing terbium, improves the sensitivity of transducer effectively, makes the dynamic range of its measurement become big.
Should be with the implementation step of example:
1) producing pulse duration by signal generator is the Gaussian pulse signal of 10ps, and the modulated laser light source can produce the Gauss light pulse and (establish central wavelength lambda
0=1550nm), use erbium-doped fiber amplifier (EDFA) can make its Output optical power up to 300mW;
2) measure the light pulse feature of importing this information processing system, comprise pulse shape and width, pulse frequency spectrum and centre wavelength;
3) the magnetic adjustable control unit that is complementary with magneto-optic nonlinear optical fiber unit is installed, concrete installation process is with embodiment 1;
4) light pulse is input to magneto-optic nonlinear optical fiber unit, further observes the pulse frequency spectrum broadening effect that nonlinear fiber causes, in like manner measure pulse shape and width, pulse frequency spectrum and centre wavelength;
5) load externally-applied magnetic field, after waiting to stablize, observe and also measure pulse shape and width, pulse frequency spectrum and centre wavelength, do contrast, obtain the size of externally-applied magnetic field, finish measurement with step 4).
For non linear coefficient is 0.68W
-1The magneto-optic optical fiber of/km is as magneto-optic coupling coefficient κ
mWhen 0.4～1.6rad/m scope, the measuring range of corresponding magnetic field intensity is 0.025T～0.075T, and at this moment, magnetic field intensity is linear with the drift of wavelength.Like this, the control action of magneto optical effect paired pulses spectral shape in the magneto-optic nonlinear optical fiber can be applied to sensory field of optic fibre, that is to say, by moving of pulse frequency chirp peak centre wavelength, the variation that can record magnetic flux density.
Those of ordinary skill in the art will appreciate that embodiment described here is in order to help reader understanding's principle of the present invention, should to be understood that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not break away from essence of the present invention according to these technology enlightenments disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (5)
1. nonlinear fiber information processor that magnetic is adjustable, comprise optical information input converter unit (1), optical information output transform unit (3), its feature in, between optical information input converter unit (1) and optical information output transform unit (3), be connected with magneto-optic nonlinear optical fiber unit (2), described magneto-optic nonlinear optical fiber unit (2) comprises magneto-optic nonlinear optical fiber and magnetic adjustable control module, described magneto-optic nonlinear optical fiber be wrapped on the magnetic adjustable control module and the influence that is subjected to the magnetic field that magnetic adjustable control module produces in order to the guided wave light-transfer characteristic in the control magneto-optic nonlinear optical fiber.
2. the nonlinear fiber information processor that magnetic according to claim 1 is adjustable, it is characterized in that, described magnetic adjustable control module comprises solenoid (26) and magneto-optic nonlinear optical fiber (24), and described magneto-optic nonlinear optical fiber (24) is positioned at the central through hole of solenoid (26).
3. the nonlinear fiber information processor that magnetic according to claim 1 is adjustable, it is characterized in that, described magnetic adjustable control module comprises skeleton (21), rotary-tray (22), cover plate (23) and coiling (25), described skeleton (21) is a cylinder, its center has a coiling hole (215), has an annular chamber (213) between the outer wall of coiling hole (215) and skeleton (21), described annular chamber (213) is divided into ring (212) in skeleton outer shroud (211) and the skeleton with skeleton (21), has a breach (214) that runs through skeleton outer shroud (211) vertically on skeleton outer shroud (211); The pallet axle (221) that described rotary-tray (22) has a hollow is used for rotary-tray (22) is sleeved on ring (212) in the skeleton, at least one end in two ends of described rotary-tray (22) is equipped with pallet covering of the fan (222) and stirs and ends dish (223) and be used for automatic or manual rotation rotary-tray (22), described rotary-tray (22) is sleeved in the skeleton of skeleton (21) ring (212) and goes up and be positioned at annular chamber (213), and described cover plate (23) has and the corresponding cover plate of the breach (214) of coiling hole (215) and skeleton outer shroud (211) wind the line hole (232) and cover plate breach (231) and be installed on the end face of skeleton (21); Coiling hole (215) is passed in coiling (25) and cover plate coiling hole (232) formation coil is wrapped on the skeleton (21).
4. the nonlinear fiber information processor that magnetic according to claim 3 is adjustable is characterized in that, above-mentioned skeleton (21), rotary-tray (22) and cover plate (23) adopt non-magnetic material.
5. the nonlinear fiber information processor that magnetic according to claim 3 is adjustable is characterized in that, also has bearing (27) between the ring (212) in the skeleton of above-mentioned rotary-tray (22) and skeleton (21).
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| CN201010572455.2A CN102075249B (en) | 2010-12-03 | 2010-12-03 | Device for processing nonlinear information of magnet adjustable optical fiber |
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|---|---|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508388A (en) * | 2011-11-17 | 2012-06-20 | 电子科技大学 | Optical fiber parameter amplifier |
| CN103913298A (en) * | 2014-03-31 | 2014-07-09 | 电子科技大学 | Device and method for measuring high nonlinear optical fiber Verdet constants |
| CN109709372A (en) * | 2018-11-28 | 2019-05-03 | 中国矿业大学 | A kind of subway/coal mine stray electrical current fibre optical sensor closed-loop control device and method |
| CN109714100A (en) * | 2017-12-26 | 2019-05-03 | 电子科技大学 | A kind of nonlinear fiber calculation of crosstalk method of multi-wavelength channel |
| CN114978304A (en) * | 2022-05-12 | 2022-08-30 | 上海交通大学 | Method, system and device for measuring gain spectrum of optical amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101571556A (en) * | 2008-04-30 | 2009-11-04 | 上海新跃仪表厂 | Sagnac interferometer type all-fiber current transformator |
| CN101750590A (en) * | 2009-10-16 | 2010-06-23 | 电子科技大学 | Method and device for measuring environment temperature change and magnetic induction strength |
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Patent Citations (2)
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| CN101571556A (en) * | 2008-04-30 | 2009-11-04 | 上海新跃仪表厂 | Sagnac interferometer type all-fiber current transformator |
| CN101750590A (en) * | 2009-10-16 | 2010-06-23 | 电子科技大学 | Method and device for measuring environment temperature change and magnetic induction strength |
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| 周晓璟等: "磁光光纤中光脉冲的非线性传播特性研究", 《光子学报》, vol. 39, no. 10, 31 October 2010 (2010-10-31), pages 1862 - 1866 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508388A (en) * | 2011-11-17 | 2012-06-20 | 电子科技大学 | Optical fiber parameter amplifier |
| CN103913298A (en) * | 2014-03-31 | 2014-07-09 | 电子科技大学 | Device and method for measuring high nonlinear optical fiber Verdet constants |
| CN103913298B (en) * | 2014-03-31 | 2016-06-29 | 电子科技大学 | A kind of apparatus and method measuring highly nonlinear optical fiber Verdet constant |
| CN109714100A (en) * | 2017-12-26 | 2019-05-03 | 电子科技大学 | A kind of nonlinear fiber calculation of crosstalk method of multi-wavelength channel |
| CN109709372A (en) * | 2018-11-28 | 2019-05-03 | 中国矿业大学 | A kind of subway/coal mine stray electrical current fibre optical sensor closed-loop control device and method |
| CN114978304A (en) * | 2022-05-12 | 2022-08-30 | 上海交通大学 | Method, system and device for measuring gain spectrum of optical amplifier |
| CN114978304B (en) * | 2022-05-12 | 2023-08-25 | 上海交通大学 | Method, system and device for measuring gain spectrum of optical amplifier |
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