CN2757151Y - Device for producing large polarized film dispersion optic fiber grating - Google Patents
Device for producing large polarized film dispersion optic fiber grating Download PDFInfo
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- CN2757151Y CN2757151Y CNU2005200021555U CN200520002155U CN2757151Y CN 2757151 Y CN2757151 Y CN 2757151Y CN U2005200021555 U CNU2005200021555 U CN U2005200021555U CN 200520002155 U CN200520002155 U CN 200520002155U CN 2757151 Y CN2757151 Y CN 2757151Y
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- optical fiber
- collimation lens
- mask plate
- fiber grating
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Abstract
The utility model relates to a device for producing large polarized film dispersion optical fiber grating, and common optical fiber can be produced into large polarized film dispersion optical fiber gratings. The utility model comprises at least one convergent lens (10), a collimating lens set (20) and a mask plate (30), wherein the collimating lens set and the optical fiber are respectively positioned on both sides of the mask plate, and the collimating lens set coincides with a principal optic axis of the convergent lens. The mask plate is perpendicular to the principal optic axis, and a rear focal plane of the collimating lens set is positioned between the collimating lens set and the mask plate, even closer to the collimating lens set. The maximum number of the first order polarized differential group delay of an optical fiber grating produced by the utility model can reach over 60 p s, and the utility model has the ability of compensating higher order PMD and the ability of compensating first order PMD. Compared with high birefringence optical fiber and polarization maintaining optical fiber, costs are reduced by hundreds of folds because materials used for producing the optical fiber grating are common single mode fiber; the utility model can be compatible with the laid common single mode fiber, and front-end investment is protected.
Description
Technical field
The utility model relates to the device that a kind of making is used for the large polarized film dispersive optical fiber grating of polarization mode dispersion (PMD) compensation, belongs to technical field of optical fiber communication.
Background technology
In recent years, along with optical fiber communication and dispersion compensation technology rapid development, the transfer rate of high speed optical communication experiment has reached more than tens Gb/s, and polarization mode dispersion at this moment just becomes the bottleneck of restriction optical communication speed, so the focus of PMD and PMD compensation having become optical communication research.And one of Primary Component of PMD compensation is exactly a large polarized film dispersive optical fiber grating.
Fiber grating has utilized optical fiber its core district refractive index generating period under the periodicity UV-irradiation to sexually revise and has made.Because fibre cladding is generally by the pure SiO of non-doping
2Constitute, its intrinsic absorption peak is positioned at 160nm place approximately, and it almost is fully transparent writing on the wavelength about the ultraviolet of 240nm, so the refractive index of fibre cladding does not change in the ablation process of grating.Each grating fringe all provides certain reflex by Fresnel reflection to incident light, when lambda1-wavelength makes when satisfying the resonance strengthed condition from the reflection of each grating fringe, grating pair reflection of incident light rate reach maximal value.Grating parameters such as the size decision that the width of optical grating reflection rate and reflection peak is changed by grating length and core district photon-induced refractive index.Therefore the essential characteristic of fiber grating is a reflective optic wave filter, and it both can make the arrowband type of bandwidth less than 0.1nm as required, also can realize the wideband filtered of tens nanometers.In addition, it also have volume little, insert loss low and with the advantage of common communications optical fiber matched well.Fiber grating will have influence on from light transmission, light amplification, optical fiber dispersion compensation, polarization mode dispersion (PMD) compensation, to almost each aspect of light-receiving.Provide the fiber laser of selectivity feedback and semiconductor laser can realize that live width has only the single longitudinal mode laser output of kilo hertz magnitude by fiber grating.In EDFA, use fiber grating can in the whole amplifier bandwidth, realize the also spontaneous emission noise of rejective amplifier (ASE) effectively of smooth gain, greatly improve simultaneously pumping efficiency, thereby light signal is realized amplifying near the low noise of desirable level.Adopt fiber grating can make full optical fibre wavelength division multiplexer simple in structure, function admirable, can realize the function of Add/drop Voice Channel with individual devices simultaneously.In addition, the cycle of suitable design, gradually curved (Chirp) fiber grating had very strong dispersion compensation ability theoretical with experimentally all being proved to be, this can eliminate the restriction of fibre-optical dispersion to traffic rate to a great extent, adopt nonlinearly chirped fiber grating, the PMD of compensated high-speed optical communication, it is big to have compensation rate, is easy to advantages such as self-adaptation dynamic delay adjustment.Therefore, fiber grating becomes indispensable important optical fibre device in the ultra high-speed optical communication of future generation.The effect of fiber grating in fiber optics is suitable with the meaning that had in geometrical optics of catoptron.In addition, cloth loudspeaker lattice (bragg) wavelength and the temperature of fiber grating and the stress that applies thereon are good linear relationship.It is a kind of fiber sensing element with premium properties that this characteristic of fiber grating makes it again.Can realize the distributed sensing of physical quantity easily with fiber grating.Aspect such as buildings and aeronautical and space technology shows and looks out wide application prospect and huge market potential this fiber-optic grating sensor in bridge, tunnel etc.
But up to now, the optical fiber that the large polarized film dispersive optical fiber grating of this PMD of being used for compensation of international, domestic making is adopted all is high birefringence optical fiber or polarization maintaining optical fibre.The transmission frequency optimization of general single mode fiber is on the light of single wavelength.The employed transmission of the domestic optical cable that has laid all is 1.3 μ m mostly, and the single-mode fiber that is laid all is the G652 general single mode fiber that the zero dispersion point is positioned at 1.3 μ m.Although the mathematical algorithm when adopting high birefringence optical fiber or polarization maintaining optical fibre making large polarized film dispersive optical fiber grating to be used for the PMD adaptive equalization is simple, but the problem of being brought is: communicate by letter with domestic existing fiber employed general single mode fiber poor compatibility, polarization dependent loss of high birefringence optical fiber or polarization maintaining optical fibre is big (maximum even can reach 3dB, be half through-put power of loss), material (high birefringence optical fiber or polarization maintaining optical fibre) price big with the junction loss of circuit, that make fiber grating is expensive, problems such as manufacture craft is more complicated, and yield rate is low.
The defective of the large polarized film dispersive optical fiber grating of making at high birefringence optical fiber, we think: have only the large polarized film dispersive optical fiber grating that adopts general single mode fiber to make fundamentally to address the above problem.But, because general single mode fiber is approximately cylindrical waveguide, have very strong axial symmetry, so, adopt common process to be difficult to produce and satisfy the PMD compensation large polarized film dispersive optical fiber grating that is used for the PMD compensation that require, that have constant polarization principal axis.
The utility model content
The purpose of this utility model is to propose a kind of device of making large polarized film dispersive optical fiber grating with the general single mode fiber of the complete compatibility of existing optical communication that utilizes.
For realizing above-mentioned utility model purpose, the utility model adopts following technical scheme:
A kind of device of making large polarized film dispersive optical fiber grating, comprise a convergent lens 10 of order placement at least, a collimation lens set 20, one mask plate 30, and collimation lens set is positioned at the opposite side with respect to fiber position of mask plate, this convergent lens and collimation lens set have primary optical axis, focus and focal length respectively, it is characterized in that:
This collimation lens set overlaps with the primary optical axis of this convergent lens, and this mask plate is perpendicular to the primary optical axis setting, and this collimation lens set is arranged on the focal position of this convergent lens, and the distance between this collimation lens set and the mask plate is greater than the focal length of this collimation lens set.
Preferable, this collimation lens set comprises that the focus of this collimation lens set is meant the focus of second collimation lens apart from nearer first collimation lens 210 of convergent lens and second collimation lens 240 far away apart from convergent lens.
Preferable, this first collimation lens and this second collimation lens all are the plano-convex spherical lenses, and sphere one side is towards this mask plate, and plane one side is towards this convergent lens.
Preferable, the distance between first collimation lens and second collimation lens equals its focal length sum.
Preferable, this device further comprises a narrow slit 40 that be arranged in parallel with mask plate, and this narrow slit is positioned at a side different with this collimation lens set of mask plate, between optical fiber and mask plate.
Preferable, the seam distance of this narrow slit is 5～200 μ m.
Preferable, this device further comprises the aperture diaphragm that is parallel to mask plate 50 that is provided with between second collimation lens and the mask plate, this aperture diaphragm is positioned at the focal position of this collimation lens set, and perpendicular to this primary optical axis.
Adopt single order polarization Differential Group Delay (DGD) maximum of the fiber grating that device described in the utility model produces to reach more than the 60ps, when having compensation single order PMD ability, also have the ability of compensation high-order PMD.Because making the material of fiber grating is general single mode fiber, compares with high birefringence optical fiber or polarization maintaining optical fibre, cost has reduced hundreds of times; Prior place be can with the general single mode fiber compatibility of having laid, front-end investment can adequately protect.
Description of drawings
The utility model is elaborated below by drawings and Examples.
Fig. 1 be making large polarized film dispersive optical fiber grating described in the utility model the horizontal direction synoptic diagram.
Fig. 2 is the synoptic diagram that collimates among Fig. 1.
Fig. 3 is a vertical direction synoptic diagram of making large polarized film dispersive optical fiber grating.
Fig. 4 is the middle filtering narrow slit synoptic diagram of Fig. 1.
Fig. 5 is the reflectance spectrum curve map that adopts the grating a of the described making of Fig. 1.
Fig. 6 is the reflectance spectrum curve map that adopts the grating b of the described making of Fig. 1.
Fig. 7 is the time lag curve figure of grating among Fig. 5 and Fig. 6.
Embodiment
As shown in Figure 1, the writing station 1 of making large polarized film dispersive optical fiber grating described in the utility model comprises convergent lens 10, collimation lens set 20, mask plate 30 and the narrow slit 40 parallel with mask plate.And, convergent lens 10, collimation lens set 20, mask plate 30 prolongs optical axis with the narrow slit 40 parallel with mask plate and is provided with in proper order, and forms collimated light path.
Can see that by Fig. 1 the excimer laser of parallel incident is through the converging action of convergent lens and the collimating effect directive mask plate 30 of collimation lens.
In conjunction with Fig. 2 and Fig. 3, on the focal plane of second collimation lens 240, also be provided with aperture diaphragm 50.The diameter of aperture diaphragm 50 is vertical with primary optical axis and parallel with mask plate 30, like this, in the directional light by second collimation lens 240, has only near directional light parallel with optical axis and that be distributed in the optical axis just can pass through aperture diaphragm 50, just can incide mask plate 30.Therefore, adjust the diameter of aperture diaphragm 50, can adjust the incident light scope of mask plate 30.
In conjunction with Fig. 4, narrow slit 40 is positioned at the focal plane place of mask plate 30 again, and seam is apart from 5---200 μ m.Ordinary optic fibre 100 is parallel to mask plate 30 and is positioned at the opposite side relative with narrow slit of mask plate 30.
The utility model usefulness is placed on collimated light path and the telecentric beam path before preceding narrow slit 40 of optical fiber and the mask plate 30, control is incided hydrogen and is carried and write direction of light and homogeneity on the general single mode fiber, thereby the index modulation that realizes fiber grating has directivity, and, telecentric beam path can also reduce the group delay ripple except that the homogeneity that improves fiber grating.
Fig. 5 to Fig. 7 has illustrated experiment effect of the present utility model.Single order polarization Differential Group Delay (DGD) maximum of the fiber grating of producing in this way can reach more than the 60ps.Because the existence of DGD slope of a curve makes it when having compensation single order PMD ability, also has the ability of compensation high-order PMD.This shows that the large polarized film dispersion non-linearity fiber grating that utilizes the utility model to make has reached both compensation of dispersion, compensates the effect of PMD again.
Though above described the utility model by embodiment, those of ordinary skills know, the utility model has many distortion and variation and does not break away from spirit of the present utility model, appended claim will comprise these distortion and variation.
Claims (7)
1. device of making large polarized film dispersive optical fiber grating, comprise a convergent lens (10) of order placement at least, a collimation lens set (20), one mask plate (30), and collimation lens set is positioned at the opposite side with respect to fiber position of mask plate, this convergent lens and collimation lens set have primary optical axis, focus and focal length respectively, it is characterized in that:
This collimation lens set overlaps with the primary optical axis of this convergent lens, and this mask plate is perpendicular to the primary optical axis setting, and this collimation lens set is arranged on the focal position of this convergent lens, and the distance between this collimation lens set and the mask plate is greater than the focal length of this collimation lens set.
2. the device of making large polarized film dispersive optical fiber grating as claimed in claim 1 is characterized in that:
This collimation lens set comprises that the focus of this collimation lens set is meant the focus of second collimation lens apart from nearer first collimation lens (210) of convergent lens and second collimation lens (240) far away apart from convergent lens.
3. the device of making large polarized film dispersive optical fiber grating as claimed in claim 2 is characterized in that:
This first collimation lens and this second collimation lens all are the plano-convex spherical lenses, and sphere one side is towards this mask plate, and plane one side is towards this convergent lens.
4. the device of making large polarized film dispersive optical fiber grating as claimed in claim 3 is characterized in that:
Distance between first collimation lens and second collimation lens equals its focal length sum.
5. the device of making large polarized film dispersive optical fiber grating as claimed in claim 1 is characterized in that:
This device further comprises a narrow slit (40) that be arranged in parallel with mask plate, and this narrow slit is positioned at a side different with this collimation lens set of mask plate, between optical fiber and mask plate.
6. the device of making large polarized film dispersive optical fiber grating as claimed in claim 5 is characterized in that:
The seam distance of this narrow slit is 5～200 μ m.
7. the device of making large polarized film dispersive optical fiber grating as claimed in claim 1 is characterized in that:
This device further comprises the aperture diaphragm that is parallel to mask plate (50) that is provided with between second collimation lens and the mask plate, and this aperture diaphragm is positioned at the focal position of this collimation lens set, and perpendicular to this primary optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200021555U CN2757151Y (en) | 2004-02-16 | 2005-02-07 | Device for producing large polarized film dispersion optic fiber grating |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200410039151 | 2004-02-16 | ||
| CN200410039151.4 | 2004-02-16 | ||
| CNU2005200021555U CN2757151Y (en) | 2004-02-16 | 2005-02-07 | Device for producing large polarized film dispersion optic fiber grating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2757151Y true CN2757151Y (en) | 2006-02-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200021555U Expired - Fee Related CN2757151Y (en) | 2004-02-16 | 2005-02-07 | Device for producing large polarized film dispersion optic fiber grating |
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| CN (1) | CN2757151Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849837A (en) * | 2015-05-04 | 2015-08-19 | 华中科技大学 | Dispersion compensation device |
-
2005
- 2005-02-07 CN CNU2005200021555U patent/CN2757151Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849837A (en) * | 2015-05-04 | 2015-08-19 | 华中科技大学 | Dispersion compensation device |
| CN104849837B (en) * | 2015-05-04 | 2017-03-01 | 华中科技大学 | A kind of dispersion compensation device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060208 |