CN100338489C - Adjustable filtering element - Google Patents
Adjustable filtering element Download PDFInfo
- Publication number
- CN100338489C CN100338489C CNB021521778A CN02152177A CN100338489C CN 100338489 C CN100338489 C CN 100338489C CN B021521778 A CNB021521778 A CN B021521778A CN 02152177 A CN02152177 A CN 02152177A CN 100338489 C CN100338489 C CN 100338489C
- Authority
- CN
- China
- Prior art keywords
- filter element
- adjustable filter
- optical fibre
- waveguide
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Optical Integrated Circuits (AREA)
Abstract
The present invention relates to an adjustable filtering element which comprises a plurality of input waveguide passages (141, 142, 143) formed on a planar waveguide (111), a plurality of output waveguide passages (161, 162, 163) and a Bragg grating (13), wherein the input waveguide passages are respectively coupled with the Bragg grating at different angles; the output waveguide passages relative to the input waveguide passages are symmetrically distributed at the other side of the normal line of the Bragg grating. When optical signals of multiple wavelengths are transmitted to different input waveguide passages, the optical signals of different wavelengths are reflected to the corresponding output waveguide passages.
Description
[technical field]
The present invention relates to a kind of filter element, particularly a kind of adjustable filter element.
[background technology]
Interfere with each other or a ultraviolet light beam produces the light and dark striped of ultraviolet light of one-period property by the phase grating cover by two ultraviolet light beams, utilize this periodic light and dark ultraviolet light striped that optical fiber is exposed and make Fiber Bragg Grating FBG.This fiber core is to be made by photosensitive material, and it absorbs after the ultraviolet photon, and refractive index n will improve.So after utilizing periodic light and dark ultraviolet light striped that fiber core is carried out exposure-processed, the zone that the ultraviolet light bright fringes is shone absorbs ultraviolet light, thereby refractive index improves, the areas diffract rate that is shone by the ultraviolet light bright fringes is then not constant.When an incident light passed through Fiber Bragg Grating FBG, the incident light that wavelength satisfies Bragg condition was reflected, and the light of other wavelength is not influenced by grating then and passes through.
So can make filter element by this Bragg grating, the filter element that tradition utilizes Bragg grating to make directly is serially connected with Bragg grating in the light path, but in a single day this filter element is made, the wavelength of its light wave that leaches is fixed, be difficult for change, and need the wavelength of change filtering in the practical application usually.
[summary of the invention]
In order to overcome the problem that existing filter element can not the accommodation reflex optical wavelength, the invention provides a kind of adjustable filter element.
The technical solution adopted for the present invention to solve the technical problems is: a kind of adjustable filter element is provided, and it comprises a plurality of input waveguide passages that are formed in the slab guide, a plurality of output waveguide passage and a Bragg grating.With different angles and Bragg grating coupling, the output waveguide passage is symmetrically distributed in the opposite side of Bragg grating normal to the input waveguide passage with respect to the input waveguide passage respectively.When the light signal with a plurality of wavelength was incident to an input waveguide passage, the light signal with certain wavelength was reflected onto corresponding output waveguide passage.
The invention has the beneficial effects as follows:, make the flashlight of certain wavelength from an output port because the adjustable filter element of the present invention is transported in the input waveguide passage that is coupled with a Bragg grating by making input light.Because a plurality of input waveguide passages that are coupled with Bragg grating are arranged, and the coupling angle is neither identical, so the catoptrical wavelength of scalable.
[description of drawings]
Fig. 1 is the stereographic map of first embodiment of the adjustable filter element of the present invention.
Fig. 2 is the stereographic map of second embodiment of the adjustable filter element of the present invention.
Fig. 3 is the stereographic map of the 3rd embodiment of the adjustable filter element of the present invention.
Fig. 4 is the stereographic map of the 4th embodiment of the adjustable filter element of the present invention.
[embodiment]
Please refer to Fig. 1, the adjustable filter element 10 of the present invention comprises a plurality of input waveguide passages 141,142,143 that are formed in the slab guide 111, a plurality of output waveguide passages 161,162,163 and a Bragg grating 13.Point 143 expressions unshowned input waveguide passage between the first input waveguide passage 141 and N input waveguide passage 142, point 163 expressions unshowned output waveguide passage between the first output waveguide passage 161 and N output waveguide passage 162.Slab guide 111 is made by SiGe (germania-silica), and it is formed in the substrate 112, and this substrate 112 is made by silicon.
Input waveguide passage 141,142,143 and Bragg grating 13 are coupled, and become θ with the normal of Bragg grating 13 respectively
i(the angle of i=1～N).Output waveguide passage 161,162,163 is the opposite side of the normal that is symmetrically distributed in Bragg grating 13 with respect to input waveguide passage 141,142,143.One input port 15 optionally is coupled with an input waveguide passage, and an output port 17 optionally is coupled with an output waveguide passage.
When input port 15 and i input waveguide passage were coupled, the flashlight with a plurality of wavelength that sends from input port 15 transferred to i input waveguide passage, further with incident angle θ
iBe incident to Bragg grating 13.Wavelength is λ
i=2d/ (1-(sin
2θ
i/ n
2))
0.5Flashlight reflexed to i output waveguide passage by Bragg grating 13, and further from output port 17 output, wherein d is the cycle of Bragg grating 13, n is the refractive index of Bragg grating 13.As: when flashlight was imported the first input waveguide passage, Bragg grating 13 reflection wavelengths were λ
1=2d/ (1-(sin
2θ
1/ n
2))
0.5Flashlight.This Bragg grating 13 of the flashlight transmission of other wavelength.
A plurality of transmitted wave pathways 121,122,123 are positioned at the opposite side of Bragg grating 13, further transfer to other optical element (figure does not show) to admit through the flashlight of Bragg grating 13 and with it.The unshowned waveguide channels of point 123 expressions between transmitted wave pathway 121,122.Transmitted wave pathway 121,122,123 is parallel with corresponding input waveguide passage 141,142,143, to guarantee the unimpeded of light path.
One governor motion (scheming not shown) links to each other with output port 17 with input port 15, rotates synchronously with control input end mouth 15 and output port 17.Make input port 15 become equal angles with the normal of Bragg grating, and be coupled with a pair of input and output waveguide channels respectively with output port 17.As shown in Figure 1, input port and output port are coupled with the first input waveguide passage and the first output waveguide passage respectively.
Please refer to Fig. 2, it has disclosed the adjustable filter element 10 ' of second embodiment of the invention.This adjustable filter element 10 ' is basic identical with adjustable filter element 10, but this adjustable filter element 10 ' further comprises one and the coupling mechanism 21 that is coupled of a plurality of output waveguide passages 161,162,163.Output port 17 is coupled with this coupling mechanism 21, thereby makes the position that need not adjust output port 17, and the flashlight that sends from arbitrary output waveguide passage all can transfer to output channel 17 by coupling mechanism 21.
Please refer to Fig. 3, it has disclosed the adjustable filter element 20 of third embodiment of the invention.This adjustable filter element 20 and adjustable filter element 10 are basic identical, but this adjustable filter element 20 comprises that further a plurality of inputs that are parallel to Bragg grating 13 normals connect waveguide channels 181,182,183 and are connected waveguide channels 191,192,193 with a plurality of outputs.Point 183 expressions connect waveguide channels 181 in first input and import the passage that is connected between the waveguide channels 182 with N, and point 193 expressions connect waveguide channels 191 in first output and export the passage that is connected between the waveguide channels 192 with N.Input connects waveguide channels 181,182,183 and connects input port 15 and input waveguide passage 141,142,143, and output connects waveguide channels 191,192,193 and connects output port 17 and output waveguide passage 161,162,163.One governor motion (scheming not shown) links to each other with output port 17 with input port 15, control input end mouth 15 moves with the direction of output port 17 along parallel Bragg grating 13, so that input port 15 and output port 17 are coupled with corresponding input interface channel and output interface channel respectively.
Please refer to Fig. 4, it has disclosed the adjustable filter element 20 ' of four embodiment of the invention.This adjustable filter element 20 ' is basic identical with adjustable filter element 20, but this adjustable filter element 20 ' comprises that further one is connected the coupling mechanism 22 that waveguide channels 191,192,193 is coupled with a plurality of outputs.Output port 17 is coupled with this coupling mechanism 22, thereby makes the position that need not adjust output port 17, all can transport to output channel 17 by coupling mechanism 22 from the flashlight that arbitrary output waveguide passage sends.
Be appreciated that a plurality of transmitted wave pathways 121,122,123 also can increase by a coupling mechanism, transmitted light is transferred to other optical element.
Claims (11)
1. adjustable filter element, comprise that a slab guide and is positioned at the Bragg grating in this slab guide, it is characterized in that: this adjustable filter element further comprises a plurality of input waveguide passage and output waveguide passages that are positioned in the slab guide, corresponding input waveguide passage and output waveguide passage are coupled with different angles and Bragg grating, and are symmetrically distributed in the both sides of this Bragg grating normal.
2. adjustable filter element as claimed in claim 1 is characterized in that this adjustable filter element further comprises a plurality of transmitted wave pathways that are positioned at this Bragg grating opposite side, and it parallels with corresponding input waveguide passage respectively.
3. adjustable filter element as claimed in claim 2, it is characterized in that this adjustable filter element comprises that further one regulates the governor motion of an input optical fibre and output optical fibre, this input optical fibre and output optical fibre are coupled with input waveguide passage and output waveguide passage respectively.
4. adjustable filter element as claimed in claim 3 is characterized in that this governor motion is the angle adjusting mechanism of a control input optical fibre and output optical fibre rotation.
5. adjustable filter element as claimed in claim 2, it is characterized in that this adjustable filter element comprises that further a plurality of inputs that parallel with the Bragg grating normal are connected waveguide channels and are connected waveguide channels with output, it is coupled with input waveguide passage and output waveguide passage respectively.
6. adjustable filter element as claimed in claim 5, it is characterized in that this adjustable filter element comprises that further one regulates the governor motion of an input optical fibre and output optical fibre, this input optical fibre and output optical fibre are connected waveguide channels respectively and are connected waveguide channels and are coupled with exporting with input.
7. adjustable filter element as claimed in claim 6 is characterized in that this governor motion is the displacement governor motion that a control input optical fibre and output optical fibre move along the direction that parallels with Bragg grating.
8. adjustable filter element as claimed in claim 2 is characterized in that this adjustable filter element further comprises a coupling mechanism, and the one end connects a plurality of output waveguide passages, and the other end connects an output optical fibre.
9. adjustable filter element as claimed in claim 5 is characterized in that this adjustable filter element further comprises a coupling mechanism, and the one end connects a plurality of outputs and connects waveguide channels, and the other end connects an output optical fibre.
10. adjustable as claimed in claim 8 or 9 filter element is characterized in that this adjustable filter element comprises that further one regulates the governor motion of the input optical fibre that is coupled with the input waveguide passage.
11. as each described adjustable filter element in the claim 1 to 9, it is characterized in that this waveguide made by SiGe, this waveguide is formed on the silicon base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021521778A CN100338489C (en) | 2002-12-02 | 2002-12-02 | Adjustable filtering element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021521778A CN100338489C (en) | 2002-12-02 | 2002-12-02 | Adjustable filtering element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1504785A CN1504785A (en) | 2004-06-16 |
| CN100338489C true CN100338489C (en) | 2007-09-19 |
Family
ID=34234664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021521778A Expired - Fee Related CN100338489C (en) | 2002-12-02 | 2002-12-02 | Adjustable filtering element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100338489C (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296571A (en) * | 1998-02-20 | 2001-05-23 | 康宁股份有限公司 | Wave length division multiplexer/demultiplexer optical device |
| JP2002277650A (en) * | 2000-03-22 | 2002-09-25 | Lucent Technol Inc | Optical waveguide grating device having adjustable optical spacing profile |
| US6459533B1 (en) * | 2000-06-26 | 2002-10-01 | Nortel Networks Limited | Tuneable optical filters |
| CN1380581A (en) * | 2001-04-09 | 2002-11-20 | 阿尔卡塔尔公司 | Blag grating filter otpical waveguide device |
-
2002
- 2002-12-02 CN CNB021521778A patent/CN100338489C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296571A (en) * | 1998-02-20 | 2001-05-23 | 康宁股份有限公司 | Wave length division multiplexer/demultiplexer optical device |
| JP2002277650A (en) * | 2000-03-22 | 2002-09-25 | Lucent Technol Inc | Optical waveguide grating device having adjustable optical spacing profile |
| US6459533B1 (en) * | 2000-06-26 | 2002-10-01 | Nortel Networks Limited | Tuneable optical filters |
| CN1380581A (en) * | 2001-04-09 | 2002-11-20 | 阿尔卡塔尔公司 | Blag grating filter otpical waveguide device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1504785A (en) | 2004-06-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102859433B (en) | Photoswitch | |
| CA1248385A (en) | Optical waveguide device | |
| CN1168982A (en) | Method of forming grating in optical waveguide | |
| WO2002048769A1 (en) | Compact dynamic crossbar switch by means of planar optics | |
| CN1547677B (en) | Method and apparatus for processing optical signals with supergratings | |
| CN1297536A (en) | Bidirectional optical wavelength multiplexer/divider | |
| CN100423477C (en) | Adjustable luminous power divider | |
| CN101566711A (en) | Optical module | |
| CN100338489C (en) | Adjustable filtering element | |
| CN1291292A (en) | Fabrication of defraction gratings and optic signal device containing the same | |
| CN204331200U (en) | Miniature co-wavelength uni-core bidirectional optical transceiver module | |
| CN202870343U (en) | Reflecting type array waveguide grating based on multiple-mode interferometer reflector | |
| CN102004282A (en) | Method for manufacturing planar waveguide superimposed grating | |
| CN111221136A (en) | Beam combining optical device | |
| CN2506033Y (en) | Thin film interference filter type wave multiplexing device | |
| CN1183394C (en) | Array waveguide raster | |
| CN109164526A (en) | A kind of unpolarized type narrow-band optical bandpass filter | |
| CN1262858C (en) | Optical demultiplexer having Bragg diffraction grating and optical communication module using the optical demultiplexer | |
| CN1303443C (en) | Array waveguide raster type comb filter | |
| CN1256600C (en) | Back incidence type high density quartz reflection raster | |
| CN1093268C (en) | Band dividing and sharing method and device | |
| CN1504786A (en) | Adjustable optics solution multiplexer | |
| US20020054727A1 (en) | Wave guide switch based on electric field control of wave reflection and transmission | |
| CN2583690Y (en) | Apparatus capable of realizing optical wave filtering and chromatic dispersion compensating function at the same time | |
| CN1256821C (en) | Holographic Fresnel congested wavelength division multiplexer and its making method and apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20070919 Termination date: 20171202 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |