CN1651949A - Controllable cascade type optical fiber raster DWDM single / multi-channel filter and its implementing method - Google Patents
Controllable cascade type optical fiber raster DWDM single / multi-channel filter and its implementing method Download PDFInfo
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- CN1651949A CN1651949A CNA2005100333049A CN200510033304A CN1651949A CN 1651949 A CN1651949 A CN 1651949A CN A2005100333049 A CNA2005100333049 A CN A2005100333049A CN 200510033304 A CN200510033304 A CN 200510033304A CN 1651949 A CN1651949 A CN 1651949A
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Abstract
The present invention relates to a tunable optic-fibre grating filter with reflection spectrum sidelobeg suppression and temperature control. It includes an optic-fibre grating capable of suppressing reflection spectrum sideloke; an inner layer packaging structure for packaging the described optic-fibre grating; a temperature shift control device mounted on the surface of inner layer packaging structure of optic-fibre grating for making constant temperature control of optic-fibre grating; a tunable device mounted on the packaging structure of optic-fibre grating; a control circuit mainly including temperature control circuit and a turning circuit; and an external layer packaging structure for packaging optic-fibre grating, temperature shift control device, tunable device and control circuit. Said invention also discloses an adjustable controlled cascade optic-fibre grating DWDM single/multichannel filter and its implementing method.
Description
Technical field
The present invention relates to a kind of have reflectance spectrum Sidelobe Suppression, temperature control, tunable fiber grating filter; The invention still further relates to a kind of controllable cascade type optical fiber raster DWDM single list/multi-channel filter and its implementation
Background technology
In optical fiber communication and Fibre Optical Sensor practicalization, fiber grating tuning Study on Technology and exploitation are subjected to increasing attention.For example all obtained using widely at aspects such as tunable optical fiber laser, optical fiber grating sensing tuned filter, optic fibre dispersion compensators.At fiber optic communication field, along with day by day popularizing of dense wavelength division multiplexing system, the tunable fiber grating technology will play more and more important effect.The light branch that is used for the upper and lower speech channel of channel level, the insert multiplexer (OADM) that constitute by tunable fiber grating, has the advantage functional, simple in structure, that cost is relatively low, be very suitable at following Metropolitan Area Network (MAN) point-to-point dense wave division multipurpose (abbreviation DWDM) optical transmission system, realize the drop and insert feature of high speed full optical network, solve the dynamic upper and lower multiplexing and demultiplexing of communication service.
For the tunable fiber grating filter that is used for dwdm system, existing many universities have carried out relevant research with research institute both at home and abroad, mainly be round following several problems: band external reflection 1) how to control uniform fiber grating is bigger, it is the channel interference that its bigger reflection secondary lobe is caused, 2) how to overcome the responsive to temperature characteristic of fiber grating reflectance spectrum, the centre wavelength that is reflectance spectrum varies with temperature the wave length shift (temperature is floated effect) that is caused, 3) how to realize the tunable of fiber grating reflection wavelength effectively.Solution is respectively accordingly: with becoming inhibition or the elimination that the mark technology realizes fiber grating reflection secondary lobe, use the temperature characterisitic of active/passive temperature compensation mode stable fiber grating, and realize the tuning of fiber grating with tension type.Concrete realization technology then is multifarious, and each show his special prowess.The technology and the technology of control grating spectrum that suppress fiber grating reflection secondary lobe have been grasped at present abroad with temperature drift, make grating reflection secondary lobe and " temperature is floated " all satisfy the requirement of dwdm system, and the realization of fiber grating tuning also only limit to single-channel tuning.Existing technology can only realize the adjusting of single optical fiber grating filter foveal reflex wavelength, and can't the accommodation reflex bandwidth.
Summary of the invention
At the shortcoming of prior art, technical matters to be solved by this invention provides a kind ofly uses that simple reflectance spectrum secondary lobe is subjected to good inhibition, temperature sensitivity is controlled, and reflectance spectrum is tunable fiber grating filter in a big way.
Second technical matters to be solved by this invention provides a kind of adjusting that not only can realize the foveal reflex wavelength, and can realize the adjusting of different reflection bandwidths, and controllable cascade type optical fiber raster DWDM single list/multi-channel filter of regulating of the channel separation between the multichannel.
The 3rd technical matters to be solved by this invention is: the implementation method that a kind of controllable cascade type optical fiber raster DWDM single list/multi-channel filter is provided.
The present invention solves the technical scheme that first technical matters adopts:
A kind of have reflectance spectrum Sidelobe Suppression, temperature control, a tunable fiber grating filter, and it comprises:
The fiber grating of an inhibitory reflex spectrum secondary lobe;
Internal layer encapsulating structure with described fiber grating encapsulation;
A temperature is floated control device, is installed in the surface of the internal layer encapsulating structure of fiber grating, to the fiber grating thermostatic control;
A tunable devices is installed on the encapsulating structure of fiber grating;
A control circuit, described control circuit mainly comprises temperature-control circuit and tuned circuit;
An outer encapsulating structure that described fiber grating, temperature is floated control device, tunable devices, control circuit encapsulation.
Above-mentioned temperature is floated control device and is comprised:
The temperature sensor that the temperature on fiber grating surface is measured in real time;
A semiconductor cooler;
Described temperature sensor is connected with described temperature-control circuit with semiconductor cooler.
Above-mentioned tunable devices comprises the combination of two coils and iron hoop, and described coil is connected with described tuned circuit.
Above-mentioned temperature-control circuit comprises reference voltage, comparer, logic control circuit and driver; Described comparer compares temperature signal and the reference voltage that described temperature sensor collects, then with input logic control circuit as a result, described logic control circuit comparator input signal and predefined temperature value, there is deviation then to control described driver and exports corresponding electric current, control described semiconductor cooler and carry out work, finish thermostatic control;
Described tuned circuit utilizes first coil and second coil to finish the effect of coordinating, requirement according to external interface control, finish the direction of current of first coil actuator and second coil actuator and the control of size by steering logic, produce pulling force or pressure between first coil and second coil, fiber grating is subjected to corresponding stress, thereby finishes tuber function.
Patent of the present invention solves the technical scheme of second technical matters:
A kind of controllable cascade type optical fiber raster DWDM single list/multi-channel filter adopts two or more identical above-mentioned fiber grating filters to be in series.
Patent of the present invention solves the technical scheme of the 3rd technical matters:
A kind of implementation method of controllable cascade type optical fiber raster DWDM single list/multi-channel filter, it comprises the steps:
(1) adopts the raised cosine light beam to realize the inscription of fiber grating background refractive index, produce the fiber grating of inhibitory reflex spectrum secondary lobe;
(2) the fiber grating internal layer is encapsulated;
(3) fiber grating filter is carried out active temperature control;
(4) adopt the Electromagnetic Control strain method tuning;
(5) with above device encapsulation, make single have reflectance spectrum inhibition, temperature control, tunable fiber grating filter;
(6) with two or more identical above-mentioned single have reflectance spectrum inhibition, temperature control, the series connection of tunable fiber grating filter.
Above-mentioned steps (3) utilizes temperature sensor that the temperature of grating surface is measured in real time, temperature value by circuit and setting compares then, if find that temperature exceeds the scope of setting, just the electric current by semiconductor cooler is changed, the characteristic of utilizing semiconductor electric energy and heat energy to transform, realize the thermostatic control of fiber grating, thereby keep the constant of whole filter temperature.
Above-mentioned steps (4) is installed coil and iron hoop on the encapsulating structure of fiber grating, have the electric current of certain intensity to pass through in the coil.When two senses of current not simultaneously, will produce stress (pulling force or pressure).Like this, just can realize pulling force or pressure by the control to direction of current in the coil, grating will be subjected to corresponding pulling force or pressure, just make fiber grating centre wavelength up and down both direction move, thereby realize tuning to fiber grating.By the control to the electric current power, size that just can proof stress has been controlled the amplitude of channel tuner indirectly.
Beneficial effect of the present invention:
1. the present invention adopts the raised cosine light beam to realize the inscription of fiber grating background refractive index, produces the reflectance spectrum secondary lobe and has obtained the fiber grating that suppresses preferably.So just can produce the very narrow wave filter of channel separation, satisfy the strict demand of dense wavelength division multiplexing system for channel spacing.
2. the present invention adds temperature and floats control device, realizes the thermostatic control of fiber grating, thereby keeps the constant of whole filter temperature, makes the foveal reflex wavelength of fiber grating can not drift about with temperature.
3. the tunable devices that adopts of the present invention just can realize pulling force or pressure by the control to direction of current in the coil, just make fiber grating centre wavelength up and down both direction move, thereby realization tuning to fiber grating.By the control to the electric current power, size that just can proof stress has been controlled the amplitude of channel tuner indirectly.
4. the present invention identically singlely has reflectance spectrum Sidelobe Suppression, temperature control, tunable fiber grating filter and contacts a plurality of, by regulating, just can realize DWDM multi-channel filter and broadband filter again.
5. the present invention has reflectance spectrum Sidelobe Suppression, temperature control, a tunable fiber grating filter for single, tuning is to utilize the electromagnetic modification strain method to realize, the method of utilizing electromagnetic force tuning is for the more and more higher Networks of Fiber Communications of intelligent requirements, has better superiority, not only be beneficial to tuning realization, and be more conducive to the realization of intelligent network.
6. the present invention has adopted reflectance spectrum Sidelobe Suppression technology, and the spacing of wave filter is very narrow, and the effect of filtering might as well; Adopt temperature control technology to make that the filtering channel of grating can very stable resting on the original channel, so crosstalking of interchannel can be good at avoiding; Adopt the electromagnetic force tuning technology, make the filtering channel wavelength control of wave filter get up easily, and it is intelligent to be beneficial to realization; A plurality of wave filter cascades can be carried out about dynamic tuning and the light wave channel according to the requirement of network.Make the grating filter of being invented can be used for the dense wavelength division multiplexing optical fiber transmission system that channel separation is 50/25GHz.
Description of drawings
Fig. 1 is a kind of structural representation with reflectance spectrum Sidelobe Suppression, temperature control, tunable fiber grating filter of the present invention;
Fig. 2 floats the control device synoptic diagram for temperature of the present invention;
Fig. 3 is a tunable devices synoptic diagram of the present invention;
Fig. 4 is a controlable electric current block scheme of the present invention;
Fig. 5 by two identical fiber grating filters shown in Figure 1 series connection the synoptic diagram of composition controllable cascade type optical fiber raster DWDM single list/multi-channel filter;
The single channel filtering that Fig. 6 adjusts for controllable cascade type optical fiber raster DWDM single list/multi-channel filter shown in Figure 5;
Fig. 7 adjust for controllable cascade type optical fiber raster DWDM single list/multi-channel filter shown in Figure 5 double-channel filtering;
Fig. 8 adjusts for controllable cascade type optical fiber raster DWDM single list/multi-channel filter shown in Figure 5 adjusts wideband filtered;
Fig. 9 by a plurality of identical fiber grating filters shown in Figure 1 series connection the synoptic diagram of composition controllable cascade type optical fiber raster DWDM single list/multi-channel filter;
Embodiment
As shown in Figure 1, a kind of have reflectance spectrum Sidelobe Suppression, temperature control, a tunable fiber grating filter, and it comprises:
The fiber grating 1 of an inhibitory reflex spectrum secondary lobe;
Internal layer encapsulating structure 2 with described fiber grating encapsulation;
A temperature is floated control device 3, and described temperature is floated control device 3, is installed in the surface of the internal layer encapsulating structure 2 of fiber grating 1, to the fiber grating thermostatic control;
A tunable devices 4;
A control circuit 5 mainly is divided into temperature-control circuit 33 and tuned circuit 43.
An outer encapsulating structure 6 that described fiber grating 1, internal layer encapsulation 2, temperature is floated control device 3, tunable devices 4, control circuit 5 encapsulation.
Described fiber grating 1 is to adopt the raised cosine light beam to realize the inscription of fiber grating background refractive index, produces the fiber grating of inhibitory reflex secondary lobe.
Temperature is as shown in Figure 2 floated control device 3 and is active attemperating unit, and it comprises a temperature sensor 31 that the temperature on fiber grating surface is measured in real time; A semiconductor cooler 32; Described temperature sensor 31 is connected with temperature-control circuit 33 with semiconductor cooler 32.Adopting temperature to float the reflection wavelength that just can make fiber grating 1 after the control device 3 does not vary with temperature and changes, thereby guaranteed in dense wave division multipurpose (DWDM) system, fiber grating 1 can not cause the drift of channel because of variation of temperature, thus the generation of having avoided interchannel to crosstalk.It mainly is that the temperature that to utilize 31 pairs of fiber grating 1 surfaces of temperature sensor be inner encapsulating structure 2 is measured in real time that described temperature is floated control device 3, compare by temperature-control circuit 33 and the temperature value of setting then, if find that temperature exceeds the scope of setting, just the electric current by semiconductor cooler 32 is changed, the characteristic of utilizing semiconductor electric energy and heat energy to transform, realize the thermostatic control of fiber grating, thereby keep the constant of whole filter temperature.
As shown in Figure 3, a tunable devices 4 mainly comprises two coils 41 and iron hoop 42 combinations, and is installed on the internal layer encapsulating structure 2 of fiber grating.On the internal layer encapsulating structure 2 of fiber grating 1, coil and iron hoop are installed, there is the electric current of certain intensity to pass through in the coil, sense of current and size are by driver 1 and driver 2 controls.When two senses of current not simultaneously, will produce stress (pulling force or pressure).Like this, just can realize pulling force or pressure by the control to direction of current in the coil, grating will be subjected to corresponding pulling force or pressure, just make fiber grating centre wavelength up and down both direction move, thereby realize tuning to fiber grating.By the control to the electric current power, size that just can proof stress has been controlled the amplitude of channel tuner indirectly.
Fig. 4 is the circuit block diagram of whole fiber grating filter, mainly is divided into temperature-control circuit 33 and tuned circuit 43.Wherein, steering logic is the core of entire circuit, utilize temperature sensor 31 and refrigeration control circuit 32 to finish temperature control automatically, the concrete course of work is: comparer compares temperature signal and the reference voltage that temperature sensor 31 collects, then with input logic control circuit as a result, logic control circuit comparator input signal and predefined temperature value, have deviation then Control Driver export corresponding electric current, the control semiconductor cooler carries out work, finishes thermostatic control.Tuned circuit utilizes coil 41 and iron hoop 42 to finish tunning effect, the concrete course of work is: according to the requirement of external interface control, finish the direction of current of coil actuator 1 and driver 2 and the control of size by steering logic, produce pulling force or pressure between coil 41 and the iron hoop 42, fiber grating 1 is subjected to corresponding stress, thereby finishes tuber function.
As shown in Figure 5, two identical single dense wave division multipurpose fiber grating filters are as shown in Figure 1 contacted,, just can realize dense wave division multipurpose list/dual channel filter and broadband filter again by suitable adjusting.Fig. 6 is not for adding the wave filter of any adjusting, and the bandwidth of two wave filters is overlapping, and integral body appears as the filtering that single-channel wave filter produced; Fig. 7 is through after the suitable adjusting, a wave filter hold mode, another wave filter adds the electric current that adds different directions in the coil, produce (draw or the press) power of answering between the coil 41 of wave filter and the iron hoop 42, fiber grating produces corresponding stress, make the foveal reflex wavelength of wave filter that corresponding skew take place, the filtering bandwidth of two wave filters is tuned on the different wavelength, thereby formed the filtering that dual channel filter produced, its channel separation can be carried out further tuning as required by adjusting the size of electric current.Fig. 8 is that the bandwidth of two filter filterings is continuous, has formed the filtering that broadband filter produced.
Fig. 9 again by suitable adjusting, just can realize dense wave division multipurpose multi-channel filter and broadband filter for a plurality of identical single tunable dense wave division multipurpose fiber grating filters are contacted.
Claims (9)
1. one kind has reflectance spectrum Sidelobe Suppression, temperature control, tunable fiber grating filter, and it comprises:
The fiber grating of an inhibitory reflex spectrum secondary lobe;
Internal layer encapsulating structure with described fiber grating encapsulation;
A temperature is floated control device, is installed in the surface of the internal layer encapsulating structure of fiber grating, to the fiber grating thermostatic control;
A tunable devices is installed on the encapsulating structure of fiber grating;
A control circuit, described control circuit mainly comprises temperature-control circuit and tuned circuit;
An outer encapsulating structure that described fiber grating, temperature is floated control device, tunable devices, control circuit encapsulation.
2. fiber grating filter according to claim 1 is characterized in that: described temperature is floated control device and is comprised: the temperature sensor that the temperature on fiber grating surface is measured in real time; A semiconductor cooler; Described temperature sensor is connected with described temperature-control circuit with semiconductor cooler.
3. fiber grating filter according to claim 1 is characterized in that: described tunable devices, comprise the combination of two coils and iron hoop, and described coil is connected with described tuned circuit.
4. fiber grating filter according to claim 1 is characterized in that: described temperature-control circuit comprises reference voltage, comparer, logic control circuit and driver; Described comparer compares temperature signal and the reference voltage that described temperature sensor collects, then with input logic control circuit as a result, described logic control circuit comparator input signal and predefined temperature value, there is deviation then to control described driver and exports corresponding electric current, control described semiconductor cooler and carry out work, finish thermostatic control.
5. fiber grating filter according to claim 1, it is characterized in that: described tuned circuit utilizes first coil and second coil to finish the effect of coordinating, requirement according to external interface control, finish the direction of current of first coil actuator and second coil actuator and the control of size by steering logic, produce pulling force or pressure between first coil and second coil, fiber grating is subjected to corresponding stress, thereby finishes tuber function.
6. controllable cascade type optical fiber raster DWDM single list/multi-channel filter is characterized in that: adopt two or more identically be in series as any one described fiber grating filter of claim 1-5.
7. the implementation method of a kind of controllable cascade type optical fiber raster DWDM single list/multi-channel filter of claim 6 is characterized in that it comprises the steps:
A kind of implementation method of controllable cascade type optical fiber raster DWDM single list/multi-channel filter, it comprises the steps:
(1) adopts the raised cosine light beam to realize the inscription of fiber grating background refractive index, produce the fiber grating of inhibitory reflex spectrum secondary lobe;
(2) the fiber grating internal layer is encapsulated;
(3) fiber grating filter is carried out active temperature control;
(4) adopt the Electromagnetic Control strain method tuning;
(5) with above device encapsulation, make single have reflectance spectrum inhibition, temperature control, tunable fiber grating filter;
(6) with two or more identical above-mentioned single have reflectance spectrum inhibition, temperature control, the series connection of tunable fiber grating filter.
8. the implementation method of controllable cascade type optical fiber raster DWDM single list/multi-channel filter according to claim 7, it is characterized in that: described step (3) utilizes temperature sensor that the temperature of grating surface is measured in real time, temperature value by circuit and setting compares then, if find that temperature exceeds the scope of setting, just the electric current by semiconductor cooler is changed, the characteristic of utilizing semiconductor electric energy and heat energy to transform, realize the thermostatic control of fiber grating, thereby keep the constant of whole filter temperature.
9. the implementation method of a kind of controllable cascade type optical fiber raster DWDM single list/multi-channel filter according to claim 7, it is characterized in that: above-mentioned steps (4) is on the encapsulating structure of fiber grating, coil and iron hoop are installed, are had the electric current of certain intensity to pass through in the coil; When two senses of current not simultaneously, to produce pulling force or pressure, just can realize pulling force or pressure by control to direction of current in the coil, grating will be subjected to corresponding pulling force or pressure, just make fiber grating centre wavelength up and down both direction move, thereby realize tuning to fiber grating; By the control to the electric current power, size that just can proof stress has been controlled the amplitude of channel tuner indirectly.
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| CNB2005100333049A CN1310051C (en) | 2005-03-01 | 2005-03-01 | Controllable cascade type optical fiber raster DWDM single / multi-channel filter and its implementing method |
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| CNB2005100333049A CN1310051C (en) | 2005-03-01 | 2005-03-01 | Controllable cascade type optical fiber raster DWDM single / multi-channel filter and its implementing method |
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| CN1310051C CN1310051C (en) | 2007-04-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102122023A (en) * | 2011-04-14 | 2011-07-13 | 暨南大学 | Method for manufacturing tunable chirped fiber grating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6842567B2 (en) * | 2002-02-07 | 2005-01-11 | Teraxion Inc. | Power efficient assemblies for applying a temperature gradient to a refractive index grating |
| CN2559992Y (en) * | 2002-06-11 | 2003-07-09 | 上海紫珊光电技术有限公司 | Tunable wavelength optical fibre grating filter |
| JP3830432B2 (en) * | 2002-07-15 | 2006-10-04 | 沖電気工業株式会社 | Fiber grating type filter package |
| CN1159614C (en) * | 2002-07-26 | 2004-07-28 | 中国科学院上海光学精密机械研究所 | Metallized optical fiber distributed micro-heater for temperature tuning of optical fiber device |
| CN1424602A (en) * | 2003-01-10 | 2003-06-18 | 中国科学院上海光学精密机械研究所 | Optical fiber tunable polarizer and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102122023A (en) * | 2011-04-14 | 2011-07-13 | 暨南大学 | Method for manufacturing tunable chirped fiber grating |
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