CN202600185U - Photorefractive long-period waveguide grating filter - Google Patents
Photorefractive long-period waveguide grating filter Download PDFInfo
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- CN202600185U CN202600185U CN 201220070024 CN201220070024U CN202600185U CN 202600185 U CN202600185 U CN 202600185U CN 201220070024 CN201220070024 CN 201220070024 CN 201220070024 U CN201220070024 U CN 201220070024U CN 202600185 U CN202600185 U CN 202600185U
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Abstract
The utility model relates to a photorefractive long-period waveguide grating filter, comprising an input tail fiber and an output tail fiber, wherein the photorefractive long-period waveguide grating filter also comprises a photorefractive long-period waveguide grating, the photorefractive long-period waveguide grating comprises a substrate, the substrate is X or Y-cut Z-propagation LiNbO3 crystal, the substrate is provided with a wrapping layer, the wrapping layer is provided with a single mode waveguide arranged along the direction of a Z-axis, the single mode waveguide is provided with a photorefractive holographic grating, and two end faces of the single mode waveguide are connected with the input tail fiber and the output tail fiber respectively. The photorefractive long-period waveguide grating filter is simple in structure, convenient in manufacture, and high in material repeating utilization rate.
Description
Technical field
The utility model relates to integrated optics field and optical communication passive device field, relates in particular to light and sells off long-period wave guide grating wave filter.
Background technology
The function of grating filter is in the input optical signal of multi-wavelength, selects the light signal of specific wavelength as required, is the key node device of realizing high capacity, the communication of two-forty all optical network, in the WDM optical network system, has a wide range of applications.
Optical filter based on optical grating construction can be divided into Bragg grating optical filter and long-period gratings optical filter by its grating cycle.Bragg grating filter shows band resistance characteristic, and the centre wavelength of reflection is bragg wavelength, and bragg wavelength satisfies λ=2n Λ, and n representes the mean refractive index of fiber core (waveguide), and Λ is the grating cycle.Long period grating filter then shows bandpass characteristics, and the light that wavelength is satisfied phase-matching condition is coupled in the covering from fiber core (waveguide), and the light of its commplementary wave length continues in fiber core (waveguide), to propagate.
Can be divided into laser direct-writing grating, photoetching grating, acoustooptic modulation grating, electrooptical modulation grating and hot optical modulation grating based on the optical filter of optical grating construction again by the method for making of its grating.The laser direct-writing grating filter utilizes highpowerpulse laser, on covering, directly carves grating; The photoetching grating filter covers on photoresist layer with mask plate through spin coating photoresist in waveguide then, uses laser radiation again, and residual photoresist just forms grating.The grating made from above-mentioned two kinds of methods is difficult to wipe, so material can not reuse.The acoustooptic modulation grating filter is to utilize the acoustooptic effect of crystal to make crystal refractive index produce periodic the change to form Bragg grating through ultrasound wave; Electric light or hot photoabsorption modulation light grating filter utilize the electric light or the thermo-optic effect of crystal, through adding in waveguide that loading electrode insert to refer to or backing is inserted and referred to (inserting the gap that refers to is exactly the grating periods lambda), apply voltage then or the control temperature is made refractive-index grating.More than three kinds of methods all need in waveguide, to install meticulous device additional, make whole manufacture craft become complicated.
In a word, present grating filter exists shortcomings such as complex structure, making difficulty and material recycling rate of waterused are low.
Summary of the invention
For the complex structure, making difficulty and the low deficiency of material recycling rate of waterused that overcome existing grating filter, the utility model provides a kind of simplified structure, light easy to make, that the material recycling rate of waterused is higher to sell off long-period wave guide grating wave filter.
For the technical scheme that solves the problems of the technologies described above employing is:
A kind of light is sold off long-period wave guide grating wave filter; Comprise input tail optical fiber and output tail optical fiber; Said light is sold off long-period wave guide grating wave filter and is comprised that also light sells off the long-period wave guide grating, and said light is sold off the long-period wave guide grating and comprised substrate, and said substrate is that X cuts the LiNbO that Z passes
3Crystal or Y cut the LiNbO that Z passes
3Crystal is provided with covering in the said substrate, Z is set to the single mode waveguide of arranging on the said covering, makes light on the said single mode waveguide and sells off holographic grating, and two end faces of said single mode waveguide are connected with the output tail optical fiber with said input tail optical fiber respectively.
Further, two of said single mode waveguide end faces are adhesively fixed with the output tail optical fiber with said input tail optical fiber respectively and are connected.
Further again, two end faces of said single mode waveguide are connected through clamps with the output tail optical fiber with said input tail optical fiber respectively.
The technical conceive of the utility model is: make the light fold changeable grating with the two-beam interference method, device and technology are simple, and utilize the light fold changeable grating under dark condition, can keep the characteristic of several years, the convenient use and dependable performance.In addition, utilize the characteristics that the light fold changeable grating can be wiped and set up in the lithium columbate crystal,, just can obtain the new grating cycle, reach purpose, thereby improve the recycling rate of waterused of material different wave length filtering through changing recording angular.
The beneficial effect of the utility model is mainly reflected in: 1, only need utilize two-beam interference just can make the long-period wave guide grating; Need on lithium columbate crystal, not add labyrinths such as loading electrode; Also avoid utilizing complicated integrated optics technology making gratings such as etching, made manufacturing technology simple; 2, the light fold changeable grating can be wiped and set up, can improve the recycling rate of waterused of material.
Description of drawings
Fig. 1 is that the utility model light is sold off long-period wave guide grating Filter Structures synoptic diagram.
Fig. 2 is that the utility model double beam interferometry making light is sold off the holographic grating synoptic diagram.
Fig. 3 is that the utility model light is sold off long-period wave guide grating filter applies device synoptic diagram.
Embodiment
Further describe below in conjunction with the embodiment of accompanying drawing the utility model.
Embodiment 1
With reference to Fig. 1～Fig. 3; A kind of light is sold off long-period wave guide grating wave filter; Comprise input tail optical fiber 101 and output tail optical fiber 105; Said light is sold off long-period wave guide grating wave filter and is comprised that also light sells off the long-period wave guide grating, and said light is sold off the long-period wave guide grating and comprised substrate 103, and said substrate 103 is cut the LiNbO that Z passes for X
3Crystal or Y cut the LiNbO that Z passes
3Crystal; In the said substrate 103 covering 102 is set; Z is set to the single mode waveguide of arranging 104 on the said covering 102, makes light on the said single mode waveguide 104 and sell off holographic grating 106, two end faces of said single mode waveguide 104 are connected with output tail optical fiber 105 with said input tail optical fiber 101 respectively.
Two end faces of said single mode waveguide 104 are adhesively fixed with output tail optical fiber 105 with said input tail optical fiber 101 respectively and are connected.
Utilize Effective Index Method to confirm physical dimension, guided mode parameter and the effective refractive index of single mode waveguide 104 and covering 102.
According to the effective refractive index of single mode waveguide 104 and the effective refractive index of covering, utilize the phase-matching condition of long-period wave guide grating, in the grating cycle when confirming each filter wavelength of correspondence, adopt the two-beam interference method to produce the holographic optical fold changeable grating.
The light of present embodiment is sold off the method for making of long-period wave guide grating wave filter, may further comprise the steps:
The making of step 1 lithium niobate base bill kept on file mould waveguide
The calculation of parameter of single mode waveguide and method for making are with aforementioned consistent; What particularly point out is: with reference to Fig. 1; The waveguide of using in the utility model is to be substrate 103 with lithium columbate crystal, forms covering 102 through expanding for the first time titanium, forms single mode waveguide 104 through expanding for the second time titanium again; The grating of making on the single mode waveguide 106 is that light is sold off holographic grating.
Step 2 light is sold off the making of long-period wave guide grating
With reference to Fig. 2, recording laser 201, preferred, can be argon laser, perhaps the frequency multiplication Nd:YAG laser of 532nm is divided into two-beam by beam splitter 202, and wherein a branch of light forms one road interference light 205 and incides in the lithium niobate waveguide after catoptron 203 reflections.Also incide in the lithium niobate waveguide through forming another road interference light 206 after catoptron 204 reflections through another Shu Guang after the beam splitter 202.Two- beam 205 and 206 meets in the lithium niobate waveguide, forms interference fringe, forms light through photorefractive effect at last and sells off long-period wave guide grating 106.
The making of step 3 wave filter and application
With reference to Fig. 1, the both ends of the surface of selling off the long-period wave guide grating at the successful light of making add input tail optical fiber 101 and output tail optical fiber 105 respectively, have just processed light and have sold off long-period wave guide grating wave filter.Tail optical fiber 101 and 105 is directly to aim at and be adhesively fixed in waveguide.
With reference to Fig. 3, wavelength-division multiplex signals light (its spectrum is as 301) is coupled into earlier in the input tail optical fiber 101, again coupled into waveguide; Light is through behind the long-period wave guide grating, is coupled into covering with the wavelength of grating generation resonance and loses; The waveguide that is coupled out of its commplementary wave length gets into output tail optical fiber 105, obtains exporting flashlight (its spectrum is as 302).
Embodiment 2
With reference to Fig. 1～Fig. 3, the difference of present embodiment and embodiment 1 is: the both ends of the surface of selling off the long-period wave guide grating at the successful light of making add input tail optical fiber 101 and output tail optical fiber 105 respectively, have just processed light and have sold off long-period wave guide grating wave filter.Input tail optical fiber 101 and output tail optical fiber 105 are through after the clamps, directly aim at and be close on the Waveguide end face.Other structures of present embodiment and implementation and embodiment 1 are identical.
Claims (3)
1. a light is sold off long-period wave guide grating wave filter; Comprise input tail optical fiber and output tail optical fiber; It is characterized in that: said light is sold off long-period wave guide grating wave filter and is comprised that also light sells off the long-period wave guide grating; Said light is sold off the long-period wave guide grating and is comprised substrate, and said substrate is that X cuts the LiNbO that Z passes
3Crystal or Y cut the LiNbO that Z passes
3Crystal is provided with covering in the said substrate, Z is set to the single mode waveguide of arranging on the said covering, makes light on the said single mode waveguide and sells off holographic grating, and two end faces of said single mode waveguide are connected with the output tail optical fiber with said input tail optical fiber respectively.
2. light as claimed in claim 1 is sold off long-period wave guide grating wave filter, it is characterized in that: two end faces of said single mode waveguide are adhesively fixed with the output tail optical fiber with said input tail optical fiber respectively and are connected.
3. light as claimed in claim 1 is sold off long-period wave guide grating wave filter, it is characterized in that: two end faces of said single mode waveguide are connected through clamps with the output tail optical fiber with said input tail optical fiber respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220070024 CN202600185U (en) | 2012-02-29 | 2012-02-29 | Photorefractive long-period waveguide grating filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220070024 CN202600185U (en) | 2012-02-29 | 2012-02-29 | Photorefractive long-period waveguide grating filter |
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| Publication Number | Publication Date |
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| CN202600185U true CN202600185U (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220070024 Expired - Fee Related CN202600185U (en) | 2012-02-29 | 2012-02-29 | Photorefractive long-period waveguide grating filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109585984A (en) * | 2018-10-26 | 2019-04-05 | 中山大学 | A kind of Broadband bandstop filter of no RLC periodic structure |
-
2012
- 2012-02-29 CN CN 201220070024 patent/CN202600185U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109585984A (en) * | 2018-10-26 | 2019-04-05 | 中山大学 | A kind of Broadband bandstop filter of no RLC periodic structure |
| CN109585984B (en) * | 2018-10-26 | 2020-04-03 | 中山大学 | Broadband band-stop filter without RLC periodic structure |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20150229 |
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| EXPY | Termination of patent right or utility model |