CN101582722A - Tunable chromatic dispersion compensation device based on chirp grating - Google Patents
Tunable chromatic dispersion compensation device based on chirp grating Download PDFInfo
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- CN101582722A CN101582722A CNA2009100723809A CN200910072380A CN101582722A CN 101582722 A CN101582722 A CN 101582722A CN A2009100723809 A CNA2009100723809 A CN A2009100723809A CN 200910072380 A CN200910072380 A CN 200910072380A CN 101582722 A CN101582722 A CN 101582722A
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Abstract
The invention discloses a tunable chromatic dispersion compensation device based on a chirp grating, belonging to the field of optical communication. The invention aims to solve the problems of untunable chromatic dispersion compensation dosage of chirp grating encapsulated with negative temperature coefficient material as well as centre wavelength drift easily caused by thermal tuning chirp grating. The invention is formed by the method that the middle part on the side of a support frame of a cantilever beam is fixedly connected with one end of the rectangular cantilever beam, and the other end of the cantilever beam is respectively fixedly connected with the top of an upper actuator and the top of a lower actuator; the upper actuator is connected with the upper top surface of the support frame of a cantilever beam via an upper locating piece, and the lower actuator is connected with the lower bottom surface of the support frame of a cantilever beam via the lower locating piece; the upper actuator and the lower actuator are respectively connected with a direct current supply, and the tops of the two actuators are connected to the same pole of the current supply; the side of the rectangular cantilever beam is provided with a flute to which the chirp grating adheres, the flute and the bottom of the cantilever beam form an included angle of 15 degrees, and the central point of the chirp grating is positioned on the neutral surface of the cantilever beam.
Description
Technical field
The present invention relates to a kind ofly, belong to optical communication field based on the chirp grating tunable chromatic dispersion compensation device.
Background technology
In recent years, along with optical communication must develop, network capacity is also in continuous expansion.Single ripple transmission rate of practicability optical communication network has reached 10Gbit/s magnitude even 40Gbti/s, and chromatic dispersion has become the very important factor of optical signal transmission quality deterioration, error rate increase.No matter facts have proved, be backbone network, or metropolitan area network, and the dispersion compensation of optical transmission system all is the necessary unit of safeguarding transmission quality.Meanwhile, the variation and the configurable functionality of the relevant supporting device of optical communication network make common point-to-point wavelength division multiplexing communication system have flexible node, realize flexible networking efficiently.Metropolitan area network connects by the sub-network that the different topology structure will have different transmitting physical characteristics.Particularly crucial optical node technology such as light exchange/router, optical add/drop multiplexer can be finished light signal exchange and the routing between any fiber port in optical node place, increase optical-fiber network transmission path uncertainty.And signal chromatic dispersion, optical pulse broadening and path are closely related, and dispersion compensation unit must possess the dynamic-tuning function and just adapt to optical communication net development need of future generation.From domestic and international experimental study, the dynamic dispersion compensation technology is to optimizing the optical-fiber network transmission quality, giving full play to networking flexibility and play an important role and become the next developing direction of research chromatic dispersion problem.
Optical fiber dispersion has caused pulse stretching, causes intersymbol interference, makes the error rate improve, and the communication quality degree descends, become of optical fiber long-distance transmissions main hinder resistance.For example, general single mode fiber (SMF), it is about 17ps/ (nmkm) at the abbe number of 1550nm window, chromatic dispersion can reach 1700ps/nm behind the transmission 100km, and for the system of 10Gbit/s, its maximum dispersion tolerance be 1000ps/nm. as seen, system is run well, must carry out dispersion compensation.Current, more to the research of dispersion compensation in the world, the dispersion compensation schemes that has proposed has: chirped fiber grating (CFG), dispersion compensating fiber (DCF), technology such as chromatic dispersion support transmission (DST), reversing spectrum, prechirp and optical fiber soliton transmission. and these methods respectively have pluses and minuses, wherein CFG because of its volume is little, in light weight, cost is low, flexible, insert characteristics such as loss is low, good with the optical fiber compatibility, wavelength selectivity is good and be subjected to general attention, become the focus of current research.The device that uses chirp grating to carry out dispersion compensation mainly contains dual mode now, a kind of is to utilize the material of negative temperature coefficient that chirp grating is encapsulated, make the dispersion measure of chirp grating not affected by environment, but chromatic dispersion compensation quantity is constant, is not suitable for the dynamic dispersion compensation occasion; Another technology is to utilize the dispersion measure of the method change chirp grating of thermal tuning to carry out dispersion compensation, but need continue heating to installing, make it maintain uniform temperature, bigger in low-temperature working environment power consumption, and thermal tuning mode response speed is slower, causes the centre wavelength drift easily.
Summary of the invention
The objective of the invention is to solve the material that utilizes negative temperature coefficient encapsulates chirp grating and is not suitable for the dynamic dispersion compensation occasion, utilize the dispersion measure of the method change chirp grating of thermal tuning to carry out the dispersion compensation low-response and should play the problem that centre wavelength is drifted about easily, a kind of stress tunable chromatic dispersion compensation device based on chirp grating is provided.
The present invention includes cantilever beam, cantilever beam bracing frame, last driver, following driver, chirp grating, first DC power supply, second DC power supply of rectangle, last keeper and following keeper,
Cantilever beam supporting rack is the U-shaped bracing frame to lateral opening; The middle part, side of cantilever beam supporting rack is fixedly connected with an end of the cantilever beam of rectangle; The cantilever beam of rectangle is set in parallel between the upper end face and bottom surface of cantilever beam supporting rack; The mobile terminal of upper keeper is arranged on the upper end face of cantilever beam supporting rack; The stiff end of upper keeper is arranged on the top of driver; The mobile terminal of lower keeper is arranged on the bottom surface of cantilever beam supporting rack; The stiff end of lower keeper is arranged on the bottom of lower driver
The other end of the cantilever beam of rectangle is arranged between the top of the bottom of driver and following driver, fixedlys connected between the cantilever beam of rectangle and the bottom of last driver, fixedly connected between the top of the cantilever beam of rectangle and following driver,
The two ends of last driver connect the both positive and negative polarity of first DC power supply respectively, the two ends of driver connect the both positive and negative polarity of second DC power supply respectively down, and the top of last driver is identical with the electric power polarity that the top connects of following driver,
The cantilever beam side of rectangle is provided with rectangular recess one, is bonded with chirp grating in the described rectangular recess, the angle of the bottom surface of the cantilever beam of described rectangular recess and rectangle be 15 the degree, the central spot of chirp grating on the neutral surface of the cantilever beam of rectangle,
Last driver and following driver adopt electric activation polymer.
Advantage of the present invention: the stress tuning manner that the present invention proposes based on cantilever beam, make electricity consumption activation polymer as drive unit, simple in structure, low in energy consumption, have response time of Millisecond.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, present embodiment comprises cantilever beam 1, cantilever beam bracing frame 2, last driver 3, following driver 4, chirp grating 5, first DC power supply 6, second DC power supply 7 of rectangle, last keeper 8 and following keeper 9
Cantilever beam supporting rack 2 is the U-shaped bracing frame to lateral opening; The middle part, side of cantilever beam supporting rack 2 is fixedly connected with an end of the cantilever beam 1 of rectangle; The cantilever beam 1 of rectangle is set in parallel between the upper end face and bottom surface of cantilever beam supporting rack 2; The mobile terminal of upper keeper 8 is arranged on the upper end face of cantilever beam supporting rack 2; The stiff end of upper keeper 8 is arranged on the top of driver 3; The mobile terminal of lower keeper 9 is arranged on the bottom surface of cantilever beam supporting rack 2; The stiff end of lower keeper 9 is arranged on the bottom of lower driver 4
The other end of the cantilever beam 1 of rectangle is arranged between the top of the bottom of driver 3 and following driver 4, fixedlys connected between the cantilever beam 1 of rectangle and the bottom of last driver 3, fixedly connected between the cantilever beam 1 of rectangle and the top of following driver 4,
The two ends of last driver 3 connect the both positive and negative polarity of first DC power supply 6 respectively, the two ends of driver 4 connect the both positive and negative polarity of second DC power supply 7 respectively down, and the top of last driver 3 is identical with the electric power polarity that the top connects of following driver 4,
In the present embodiment, be fixed together by epoxy resin between cantilever beam 1 and last driver 3 and the following driver 4.
The numerical value of the direct voltage that driver 3 and following driver 4 two ends load in the adjusting makes driver 3 produce different deformation with following driver 4, makes cantilever beam 1 crooked up or down under the effect of deformation, is illustrated in conjunction with specific embodiments:
The top of last driver 3 connects the positive pole of first DC power supply 6, the bottom of last driver 3 connects the negative pole of first DC power supply 6, the top of following driver 4 connects the positive pole of second DC power supply 7, the bottom of following driver 4 connects the negative pole of second DC power supply 7, regulate first DC power supply, 6 output 500V voltages, regulate second DC power supply, 7 output 200V voltages, after the energising, the last driver 3 and the following driver 4 that are made of electric activation polymer all produce deformation, but because the voltage that the voltage that last driver 3 two ends add adds greater than following driver 4 two ends, therefore, the degree of last driver 3 elongations is greater than the degree of following driver 4 elongations, under the effect of two drivers, the cantilever beam 1 that is between driver 3 and the following driver 4 is bent downwardly, the amount of deflection of cantilever beam 1 changes, and then deformation take place in drive chirp grating 5, be positioned at the stretching that above chirp grating 5 first halves of cantilever beam 1 neutral surface produce gradient, be positioned at the compression that following chirp grating 5 Lower Halves of cantilever beam 1 neutral surface produce gradient, thereby changed the chirp value of chirp grating 5, realized the purpose of dynamic dispersion compensation.
Otherwise, during voltage that the voltage that adds when last driver 3 two ends adds less than driver 4 two ends down, cantilever beam 1 is bent upwards, and is positioned at the compression that above chirp grating 5 first halves of cantilever beam 1 neutral surface produce gradient, is positioned at the stretching that following chirp grating 5 Lower Halves of cantilever beam 1 neutral surface produce gradient.
The chromatic dispersion compensation quantity of chirp grating 5 is relevant with 4 alive numerical value of following driver with last driver 3, the dispersion adjustment variable quantity is linear with the voltage that is applied on driver 3 and the following driver 4, therefore adjusting is gone up driver 3 and has been realized the chirp coefficient adjusting of chirped fiber grating with following driver 4 voltage values, thereby realizes dynamic dispersion compensation by regulation voltage.
Embodiment two: the difference of present embodiment and execution mode one is, last keeper 8 is made up of upper spring 8-1 and last bolt 8-2, the bottom of upper spring 8-1 is connected with the top of last driver 3 as the stiff end of last keeper 8, the screw rod of last bolt 8-2 runs through the last end face of cantilever beam bracing frame 2 as the mobile terminal of last keeper 8, the head of last bolt 8-2 is positioned on the last end face of cantilever beam bracing frame 2, fixedly connected with the top of upper spring 8-1 in the screw rod bottom of last bolt 8-2, following keeper 9 is made up of lower spring 9-1 and following bolt 9-2, the top conduct of the lower spring 9-1 stiff end of keeper 9 down is connected with the bottom of following driver 4, the bottom surface of cantilever beam bracing frame 2 is run through in the mobile terminal of keeper 9 under the screw rod conduct of following bolt 9-2, the head of following bolt 9-2 is positioned under the bottom surface of cantilever beam bracing frame 2, the bottom of the screw rod of following bolt 9-2 bottom and lower spring 9-1 with fixedly connected, other composition is identical with execution mode one with annexation.
Provide the annexation of upper spring 8-1 and last bolt 8-2 in specific embodiment explanation device in the present embodiment, and the annexation of lower spring 9-1 and following bolt 9-2: upper spring 8-1 and lower spring 9-1 select volute spring for use, the top of last driver 3 links to each other with the conical surface of upper spring 8-1, the end of last bolt 8-2 processes groove, the last bolt 8-2 that the awl point of upper spring 8-1 and end have groove embedding mutually connects, the bottom of following driver 4 links to each other with the conical surface of lower spring 9-1, the end of following bolt 9-2 processes groove, and the following bolt 9-2 that the awl point of lower spring 9-1 and end have groove embedding mutually connects.
By regulating bolt 8-2 and following bolt 9-2 the initial position of cantilever beam 1 is set, thereby the initial chirp amount of chirp grating 5 is set.
Embodiment three: the difference of present embodiment and execution mode one is that cantilever beam 1 is selected the polymethyl methacrylate material for use, and other composition is identical with execution mode one with annexation.
Embodiment four: the difference of present embodiment and execution mode one is, chirp grating 5 selects for use reflectivity greater than 95% high reflectance grating, and other composition is identical with execution mode one with annexation.
Embodiment five: the difference of present embodiment and execution mode one is that the cross section of rectangular recess is 0.5 millimeter * 0.5 millimeter, and other composition is identical with execution mode one with annexation.
Carve 0.5 millimeter * 0.5 millimeter groove together in cantilever beam 1 side of rectangle, the angle of the bottom surface of described groove and cantilever beam 1 is 15 degree, smear chirp grating 5 with epoxy resin, and put into described groove, regulate chirp grating 5 and make it be in the groove center, allow the central spot of chirp grating 5 on the neutral surface of cantilever beam 1, put into the drying baker cured epoxy resin again, make chirp grating 5 and cantilever beam 1 bond together deformation along with the deformation of cantilever beam 1.
Embodiment six: the difference of present embodiment and execution mode one is that first DC power supply 6 and second DC power supply 7 all can provide the adjustable direct voltage of voltage regulation of 0～6000V, and other composition is identical with execution mode one with annexation.
Embodiment seven: the difference of present embodiment and execution mode one to six any execution mode is, a kind of circulator 10 that also comprises three ports based on the chirp grating tunable chromatic dispersion compensation device, first port A of circulator 10 is the dispersion compensation signal input, second port B of circulator 10 links to each other with an end of chirp grating 5, the 3rd port C of circulator 10 is the dispersion compensation signal output, and other composition is identical with execution mode one to six with annexation.
Light pulse produces chirp in the transmission course in optical fiber, every a segment distance apparatus of the present invention are set, the signal of chromatic dispersion is entered by second port of circulator 10, first port by circulator 10 enters apparatus of the present invention again, light pulse after tuning is exported by the 3rd port of circulator 10, continues to transmit in optical fiber.
Operation principle:
Fiber grating is a kind of passive device, it is a light sensitivity of utilizing fiber optic materials, in optical fiber, form a kind of space refraction index profile by the uv-exposure method, promptly form the filter or the speculum of an arrowband in fibre core, this structure can change and control the dissemination of light wave in optical fiber.Chirp grating utilizes its inner grating cycle difference, can make along fiber length and reflect different wave length at diverse location, promptly produces chirp, and it can produce the effect of a compression to light pulse; Owing to dispersion interaction, the pulse duration broadening causes intersymbol interference in the Optical Fiber Transmission process in light pulse, makes the error rate improve, and the communication quality degree descends.Utilize chirp that the light pulse of broadening is compressed, make it be returned to original state, farther thereby light signal can be propagated, it is exactly dispersion compensation that compression process is carried out in the light pulse of broadening.The dispersion compensation of fiber grating is the chirp that has utilized it, so in order to realize within the specific limits adjustable of chirp value that dynamic dispersion compensation must realize fiber grating.
The fiber grating tuning technology in principle, can be divided into thermal tuning and stress is tuning.Fiber grating foveal reflex wavelength X
BCan be expressed as:
λ
B＝2n
effΛ (1)
Λ is the cycle of grating in the formula (1), n
EffIt is the effective refractive index of grating region.
Hence one can see that, and bragg wavelength is with n
EffChange and change with Λ.Under stress, by the extension in grating cycle and elasto-optical effect and cause the variation of bragg wavelength, when extraneous temperature change, thermal expansion effects and thermo-optic effect are arranged and cause the variation of bragg wavelength.The thermal effect of optical fiber and stress effect are mutually independently, and when temperature and stress changed, the corresponding amount of bragg wavelength can be expressed as:
Δλ
B/λ
B＝(1-P
e)ε+(a+ξ)ΔT (2)
ε is the axial strain of fiber grating in the formula (2); Δ T is a grating region variation of temperature amount; P
eBe effective elasto-optical coefficient of optical fiber, a and ξ are thermal coefficient of expansion and thermo-optical coeffecient.By formula (2) as can be seen, no matter be strain or temperature, all be linear to the influence of grating bragg wavelength.Therefore, by stretching or the compression fiber grating, perhaps change n by changing optical fiber grating temperature
EffAnd Λ, can reach tuning purpose.
The present invention adopts the stress tuning manner, make the drive part of the driver of electricity consumption activation polymer (EAP) making as this device, utilize the linear relationship of good voltage of EAP and deformation, change its input voltage by computer control, promptly change the magnitude of voltage of first DC power supply 6 and 7 outputs of second DC power supply, the amount of deflection that drives the cantilever beam 1 of dispersion compensation device produces accurate the variation, make half of the chirp grating 5 be attached to cantilever beam 1 side produce the stretching of gradient, second half produces the compression of gradient, thereby and guaranteed that centre wavelength can not take place under the prerequisite of drift in adjustment process, change the chirp value of chirp grating 5, realized the purpose of dynamic dispersion compensation.
Claims (8)
1, a kind of based on the chirp grating tunable chromatic dispersion compensation device, it is characterized in that, it comprises cantilever beam (1), cantilever beam bracing frame (2), last driver (3), following driver (4), chirp grating (5), first DC power supply (6), second DC power supply (7) of rectangle, last keeper (8) and following keeper (9)
Cantilever beam bracing frame (2) is the U-shaped bracing frame to lateral opening, fixedly connected with an end of the cantilever beam (1) of rectangle in the middle part, side of cantilever beam bracing frame (2), the cantilever beam of rectangle (1) is set in parallel between the last end face and bottom surface of cantilever beam bracing frame (2), the mobile terminal of last keeper (8) is arranged on the last end face of cantilever beam bracing frame (2), the stiff end of last keeper (8) is arranged on the top of driver (3), the mobile terminal of following keeper (9) is arranged on the bottom surface of cantilever beam bracing frame (2), the stiff end of following keeper (9) is arranged on down the bottom of driver (4)
The other end of the cantilever beam of rectangle (1) is arranged between the top of the bottom of driver (3) and following driver (4), fixedly connected between the bottom of the cantilever beam of rectangle (1) and last driver (3), fixedly connected between the top of the cantilever beam of rectangle (1) and following driver (4)
The two ends of last driver (3) connect the both positive and negative polarity of first DC power supply (6) respectively, the two ends of driver (4) connect the both positive and negative polarity of second DC power supply (7) respectively down, and the top of last driver (3) is identical with the electric power polarity that the top connects of following driver (4),
The cantilever beam of rectangle (1) side is provided with rectangular recess one, be bonded with chirp grating (5) in the described rectangular recess, the angle of the bottom surface of the cantilever beam of described rectangular recess and rectangle (1) is 15 degree, and the central spot of chirp grating (5) is on the neutral surface of the cantilever beam (1) of rectangle
Last driver (3) and following driver (4) adopt electric activation polymer.
2, according to claim 1 a kind of based on the chirp grating tunable chromatic dispersion compensation device, it is characterized in that, last keeper (8) is made up of upper spring (8-1) and last bolt (8-2), the bottom of upper spring (8-1) is connected with the top of last driver (3) as the stiff end of last keeper (8), the screw rod of last bolt (8-2) runs through the last end face of cantilever beam bracing frame (2) as the mobile terminal of last keeper (8), the head of last bolt (8-2) is positioned on the last end face of cantilever beam bracing frame (2), fixedly connected with the top of upper spring (8-1) in the screw rod bottom of last bolt (8-2)
Following keeper (9) is made up of lower spring (9-1) and following bolt (9-2), the top conduct of lower spring (9-1) stiff end of keeper (9) down is connected with the bottom of following driver (4), the bottom surface of cantilever beam bracing frame (2) is run through in the mobile terminal of keeper (9) under the screw rod conduct of following bolt (9-2), the head of following bolt (9-2) is positioned under the bottom surface of cantilever beam bracing frame (2), the bottom of the screw rod of following bolt (9-2) bottom and lower spring (9-1) with fixedly connected.
3, according to claim 1ly a kind ofly it is characterized in that based on the chirp grating tunable chromatic dispersion compensation device cantilever beam (1) is selected the polymethyl methacrylate material for use.
4, according to claim 1 a kind ofly it is characterized in that based on the chirp grating tunable chromatic dispersion compensation device, it is 4.6 electric activation polymer that last driver (3) and following driver (4) adopt dielectric constant.
5, according to claim 1 a kind ofly it is characterized in that based on the chirp grating tunable chromatic dispersion compensation device, it is high reflectance grating more than 95% that chirp grating (5) is selected reflectivity for use.
6, according to claim 1ly a kind ofly it is characterized in that based on the chirp grating tunable chromatic dispersion compensation device cross section of rectangular recess is 0.5 millimeter * 0.5 millimeter.
7, according to claim 1ly a kind ofly it is characterized in that based on the chirp grating tunable chromatic dispersion compensation device first DC power supply (6) and second DC power supply (7) all can provide the adjustable direct voltage of voltage regulation of 0～6000V.
8, described a kind of according to claim 1 to 7 based on the chirp grating tunable chromatic dispersion compensation device, it is characterized in that, a kind of circulator (10) that also comprises three ports based on the chirp grating tunable chromatic dispersion compensation device, first port (A) of circulator (10) is the dispersion compensation signal input, second port (B) of circulator (10) links to each other with an end of chirp grating (5), and the 3rd port (C) of circulator (10) is the dispersion compensation signal output.
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| CN2009100723809A CN101582722B (en) | 2009-06-26 | 2009-06-26 | Tunable chromatic dispersion compensation device based on chirp grating |
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| CN2009100723809A CN101582722B (en) | 2009-06-26 | 2009-06-26 | Tunable chromatic dispersion compensation device based on chirp grating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799581B (en) * | 2009-12-31 | 2011-06-15 | 武汉光迅科技股份有限公司 | Tunable dispersion compensator |
| CN109031652A (en) * | 2018-09-11 | 2018-12-18 | 国网安徽省电力有限公司蚌埠供电公司 | A kind of low-loss optically communication dispersion compensator and its dispersion compensation method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1236338C (en) * | 2004-03-19 | 2006-01-11 | 中国科学院上海光学精密机械研究所 | Polarizing membrane dispersion compensator based on optical fiber raster |
| CN1818729A (en) * | 2006-03-28 | 2006-08-16 | 烽火通信科技股份有限公司 | Chirp fibre-optical grating compensator with dispersion |
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- 2009-06-26 CN CN2009100723809A patent/CN101582722B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799581B (en) * | 2009-12-31 | 2011-06-15 | 武汉光迅科技股份有限公司 | Tunable dispersion compensator |
| CN109031652A (en) * | 2018-09-11 | 2018-12-18 | 国网安徽省电力有限公司蚌埠供电公司 | A kind of low-loss optically communication dispersion compensator and its dispersion compensation method |
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