CN202815262U - Double-filtering microstructure beam splitter based on singlemode-multimode fiber grating - Google Patents
Double-filtering microstructure beam splitter based on singlemode-multimode fiber grating Download PDFInfo
- Publication number
- CN202815262U CN202815262U CN 201220450295 CN201220450295U CN202815262U CN 202815262 U CN202815262 U CN 202815262U CN 201220450295 CN201220450295 CN 201220450295 CN 201220450295 U CN201220450295 U CN 201220450295U CN 202815262 U CN202815262 U CN 202815262U
- Authority
- CN
- China
- Prior art keywords
- fiber
- mode
- optical fiber
- double
- beam splitter
- 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
Abstract
The utility model belongs to the technical field of optical fibers, and specifically relates to a double-filtering microstructure beam splitter based on singlemode-multimode fiber gratings. In the double-filtering microstructure beam splitter, a broad spectra light source (1) is connected with an input end of a single mode fiber. An output end of the single mode fiber is connected with an input end of a multimode fiber (4). A long period fiber gating is written in the multimode fiber. An output end of the multimode fiber is connected with a CCD detector. A diameter of a fiber core of the multimode fiber is lower than 125 [mu]m, and is larger than or equal to 105 [mu]m. The single mode fiber and the multimode fiber are connected through dislocation welding. The multimode fiber also can be replaced by special optical fibers such as a double-core fiber, an annular core fiber, and a three-core fiber. Compared with a process of simply writing a gating in a multimode fiber, the double-filtering microstructure beam splitter has excellent stability and controllability. Fiber materials and components used in the double-filtering microstructure beam splitter are standard optical fiber communication components. Compared with former beam splitters, the beam splitter is characterized by simple structure, small size, low cost, and high precision.
Description
Technical field
The utility model belongs to the optical fiber technology field, is specifically related to a kind of fiber grating microstructure beam splitter with double-smoothing function.
Background technology
Photon replaces electronics, and integrated optical circuit replaces integrated circuit will improve greatly speed and the ability of human process information.And research and make various functional form optical device and finally realize optics integrated be optical field researcher's one of important goal.Multimode optical fiber is the earliest optical fiber structure of development and Application of scientists, and its inner pattern interference causes the field distribution of multimode optical fiber radial light to be the cycle variation with fiber axis to change of distance.The multi-mode interference effect is studied the most widely and is based on single mode-multi-mode-single mode (SMS) optical fiber structure in the multimode optical fiber, namely utilize single-mode fiber as leading-in end light to be incorporated in the multimode optical fiber, then again utilize single-mode fiber that light is drawn from an other end of multimode optical fiber.Utilize the SMS structure can realize the measurement simultaneously of displacement, refractive index and many reference amounts, and can study strain-responsive.In optical-fibre communications, the SMS structure is supposed to realize filter function, the pattern interference effect among the SMS utilized that Optics Letters in 2006 goes up Waleed doctor S.Mohammed that delivered Canadian Toronto university etc. realizes the paper of bandpass filtering, the three dB bandwidth of having showed 13nm, this wave filter has 0.4dB low insertion loss, the characteristics such as simple in structure and with low cost with respect to traditional wave filter.
On the other hand, since the people such as K.O.Hill developed in the world first fiber grating first in 1978, since the Fiber Bragg Grating FBG, be that wiring method, theoretical research or the application of fiber grating all obtained develop rapidly namely.People successively develop the fiber grating that some have special construction on the basis of Fiber Bragg Grating FBG and long period fiber grating, such as chirped fiber grating, Gauss's fiber grating, Gaussian apodization fiber grating, phase-shifted fiber grating, superstructure fiber grating, inclined optical fiber grating, long period fiber grating etc.The appearance of New-type photon crystal optical fiber and micro-nano fiber more for the development of fiber grating has increased new element, can be believed, fiber grating will obtain further development and more widely application in communication, sensing and association area thereof.Fiber grating on the ordinary meaning generally all is to make in single-mode fiber, make grating spectrum response relative complex in the multimode optical fiber, can not make traditional wave filter, but at sensory field of optic fibre, write grating in the multimode optical fiber and can have the characteristics that are different from the response of single-mode optics grating spectrum, can be used for multi-parameter sensing.Multi-mode optica lfiber grating also is used to provide the optical-fiber laser feedback of particular requirement.But various mode profile can change along with factors such as incentive condition, fibre-optical bendings in the multimode optical fiber, thereby multi-mode optica lfiber grating spectrum can't be stablized.If can control multimode optical fiber internal schema distribution situation, with so that utilize the spectral response of multi-mode optica lfiber grating relatively stable, thereby multi-mode optica lfiber grating is widely used as the single-mode fiber grating.
The utility model combines the SMS structure with Fiber Bragg Grating technology, propose a kind of fiber grating microstructure beam splitter with double-smoothing function.This device is different from simple multi-mode optica lfiber grating device, and structure has the single mode of horizontal filtering characteristic-multi-mode-single mode optical fiber structure, and writes vertical filtering grating in the multimode optical fiber in this structure, realizes the dual optical fiber filtering of transverse and longitudinal.This filtering device has guaranteed the stable and controllability of device in the spectral response characteristic that can possess multi-mode optica lfiber grating.Utilize this structure to realize the microstructure beam splitting in interaction and the mode-coherent effect of stable several patterns that encouraged of multimode optical fiber section and grating, can be widely used in fiber optic communication field, as the preposition device that is used for wavelength-division multiplex.
Summary of the invention
The purpose of this utility model is to propose a kind of simple in structure, fiber grating microstructure beam splitter with double-smoothing function.
The purpose of this utility model is achieved in that
Wide spectrum light source (1) connects the input end of single-mode fiber (2), and the output terminal of single-mode fiber (2) connects the input end of multimode optical fiber (4), writes long-period gratings in multimode optical fiber, and the output terminal of multimode optical fiber (4) connects ccd detector.
The multimode optical fiber core diameter is 125 μ m＞d 〉=105 μ m.
Single-mode fiber and multimode optical fiber can be welded together by dislocation.
Multimode optical fiber can also be replaced by the special optical fiber that comprises twin-core fiber, toroidal cores optical fiber and three core fibres.
The beneficial effects of the utility model are:
The utility model can be controlled the pattern that encourages in the multimode optical fiber by the horizontal filtering characteristic of control single mode-multi-mode-single mode optical fiber structure, with respect to simply writing grating in multimode optical fiber will have high stability and controllability.The fiber optic materials that adopts and device are mark Huaihe River optical fiber communication element, have advantage simple in structure, that volume is little, cost is low, precision is high with respect in the past beam splitter.
Description of drawings
Fig. 1 is based on the structural representation of the double-smoothing microstructure beam splitter of single mode-multi-mode optica lfiber grating;
Fig. 2 is the mode amplitude simulation result that the multimode optical fiber internal motivation rises;
Fig. 3 is single-mode fiber and large core diameter multimode optical fiber dislocation welding synoptic diagram;
Fig. 4 is the twin-core fiber of single-mode fiber and the special optical fiber synoptic diagram that is of coupled connections;
Fig. 5 is the drive factor simulation result synoptic diagram of the different mode when being 3 μ m of the off-axis amount between single-mode fiber and the multimode optical fiber.
Embodiment
Based on the structure of the double-smoothing microstructure beam splitter of single mode-multi-mode optica lfiber grating as shown in Figure 1, comprise wide spectrum light source 1, single-mode fiber 2, single mode and multimode optical fiber interface 3, multimode optical fiber 4, write long-period gratings 5, CCD sniffer 6.
Wide spectrum light source 1 connects the input end of single-mode fiber 2, the output terminal of single-mode fiber 2 connects the input end of multimode optical fiber 4, the two coupling forms single mode and multimode optical fiber interface 3, writes long-period gratings in multimode optical fiber 4, and the output terminal of multimode optical fiber 4 connects ccd detector.
After the light that wide spectrum light source 1 sends enters single-mode fiber 2, single-mode field in the single-mode fiber will be coupled in the multimode optical fiber 4, because the mode transfer characteristic of multimode optical fiber, light has selectively encouraged several patterns in large core diameter multimode optical fiber, the excitation density of each pattern depends on the mould field match condition of each pattern in the interior light wave pattern of single-mode fiber and the multimode optical fiber, can provide analysis by coupled mode theory, the pattern of indivedual several Satisfying Matching Conditions can be coupled and have larger intensity, and the intensity of the Mode Coupling of Satisfying Matching Conditions acquisition is not little.After writing grating in the multimode optical fiber, each pattern that has been energized will and grating between again emergence pattern coupling, also be to have optionally, and different wave length encourages different patterns in multimode optical fiber, the intensity after causing being coupled is different.The pattern that again is coupled with grating also depends on the incident light wavelength, and different mode carries out selectively coupled, forms different self-focusing hot spots, differentiates corresponding wavelength with CCD according to the spot size shape, reaches the purpose that realizes beam splitting.
The utility model at first is choosing of structural parameters.Single-mode fiber is the single-mode fiber SMF-28 of standard, core diameter 8.2 μ m, cladding diameter 125 μ m; Multimode optical fiber is step change type MMF, core diameter 105 μ m, cladding diameter 125 μ m.In the double-smoothing microstructure beam splitter structure based on single mode-multi-mode optica lfiber grating, the pattern that encourage multimode optical fiber inside mainly is subjected to the control of wavelength and structural parameters, in order to realize the microstructure beam splitting, wavelength is a variable parameter, and structural parameters are then fixed.Structural parameters mainly comprise: the size that fibre core was aimed at when large core diameter multimode optical fiber parameter, single-mode fiber and multimode optical fiber welded, the parameter of inscription grating.Wherein the length of large core diameter multimode optical fiber is a very important parameter, and it has determined the quality of hot spot that CCD detects, and different wave length encourages different patterns in multimode optical fiber.When single-mode fiber positive axis docking multimode optical fiber, the mode amplitude result that internal motivation rises (being coupling coefficient among the figure) as shown in Figure 2.As seen from the figure, the multimode optical fiber of certain radius, the peak value of its coupling coefficient be corresponding specific pattern all, interferes between several patterns that encouraged and grating interaction generation pattern, cause the self-focusing hot spot that forms different because of wavelength, thereby realize the microstructure beam splitting.
Next is writing of the interior grating of multimode optical fiber.The one-tenth grid process of multi-mode optica lfiber grating and the preparation process of ordinary optic fibre grating are similar, utilize Ultra-Violet Laser and phase mask plate, be that with the preparation process difference of ordinary optic fibre grating the focus of multi-mode optica lfiber grating phase mask plate in manufacturing process need to be optimized adjustment, must utilize the structure of fiber_optic that possesses automatic rotation function simultaneously.When writing grating, realize evenly writing of grating by rotating single mode-multimode optical fiber along fiber axis, thereby the high-quality of realizing long period fiber grating writes.
The control method of multimode optical fiber internal mode field excitation can also utilize single-mode fiber and large core diameter multimode optical fiber dislocation welding to realize that the multimode optical fiber that wherein plays a major role can also adopt special optical fiber.Fig. 3 is single-mode fiber and large core diameter multimode optical fiber dislocation welding synoptic diagram, and Fig. 4 is single-mode fiber and the special optical fiber synoptic diagram that is of coupled connections.The structure of Fig. 3 comprises wide spectrum light source 1, single-mode fiber 2, multimode optical fiber 3, writes long-period gratings 4, CCD sniffer 5.Centre wavelength is got 1550nm when carrying out numerical solution, and the drive factor of different mode as shown in Figure 5 when the off-axis amount between single-mode fiber and the multimode optical fiber was 3 μ m.The structure of Fig. 4 comprises wide spectrum light source 1, single-mode fiber 2, special optical fiber 3, writes long-period gratings 4, CCD sniffer 5, and special optical fiber mainly adopts twin-core fiber, in addition adopts toroidal cores optical fiber and three core fibres also can realize.If special optical fiber is twin-core fiber, be equivalent to the welding that misplaces of single-mode fiber and two optical fiber; If special optical fiber is toroidal cores optical fiber, be equivalent to the welding that misplaces of single-mode fiber and a plurality of optical fiber; If special optical fiber is three core fibres, be equivalent to the welding that misplaces of single-mode fiber and three optical fiber.
Advantage and disadvantage of the present utility model is:
(1) the utility model utilizes single mode-multi-mode-single mode fiber grating to make the double-smoothing device, expands the fiber grating kind, and has provided the preparation method of this fiber grating.This grating is different from common multi-mode optica lfiber grating, can control the pattern that encourages in the multimode optical fiber by the horizontal filtering characteristic of control single mode-multi-mode-single mode optical fiber structure, with respect to simply writing grating in multimode optical fiber will have high stability and controllability.
(2) the utility model utilizes single mode-multi-mode-single mode fiber grating double-smoothing structure to make fiber grating microstructure beam splitter, this structure utilizes different wave length to encourage different patterns in multimode optical fiber, carry out selectively coupled between each pattern, obtain simultaneously the hot spot of different size, realize the microstructure beam splitting.
(3) the utility model adopts special optical fiber, special optical fiber is introduced in the making of microstructure beam splitter, has expanded the application of special optical fiber.
(4) fiber optic materials and the device that adopt of the utility model is mark Huaihe River optical fiber communication element, has characteristics simple in structure, that volume is little, cost is low, precision is high with respect in the past beam splitter, obtains easily, is conducive to promote.
Claims (4)
1. double-smoothing microstructure beam splitter based on single mode-multi-mode optica lfiber grating, it is characterized in that: wide spectrum light source (1) connects the input end of single-mode fiber (2), the output terminal of single-mode fiber (2) connects the input end of multimode optical fiber (4), write long-period gratings in multimode optical fiber, the output terminal of multimode optical fiber (4) connects ccd detector.
2. a kind of double-smoothing microstructure beam splitter based on single mode-multi-mode optica lfiber grating according to claim 1, it is characterized in that: described multimode optical fiber core diameter is 125 μ m＞d 〉=105 μ m.
3. a kind of double-smoothing microstructure beam splitter based on single mode-multi-mode optica lfiber grating according to claim 1, it is characterized in that: described single-mode fiber and multimode optical fiber can be welded together by dislocation.
4. it is characterized in that according to claim 1 or 3 described a kind of double-smoothing microstructure beam splitters based on single mode-multi-mode optica lfiber grating: described multimode optical fiber can also be replaced by the special optical fiber that comprises twin-core fiber, toroidal cores optical fiber and three core fibres.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220450295 CN202815262U (en) | 2012-09-05 | 2012-09-05 | Double-filtering microstructure beam splitter based on singlemode-multimode fiber grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220450295 CN202815262U (en) | 2012-09-05 | 2012-09-05 | Double-filtering microstructure beam splitter based on singlemode-multimode fiber grating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202815262U true CN202815262U (en) | 2013-03-20 |
Family
ID=47874118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220450295 Expired - Fee Related CN202815262U (en) | 2012-09-05 | 2012-09-05 | Double-filtering microstructure beam splitter based on singlemode-multimode fiber grating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202815262U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830464A (en) * | 2012-09-05 | 2012-12-19 | 哈尔滨工程大学 | Double-filtering microstructure beam splitter based on single mode-multimode fiber bragg grating |
| CN103278782A (en) * | 2013-05-17 | 2013-09-04 | 天津理工大学 | Magnetic field sensor based on magnetic fluid and micro-nanofiber evanescent field |
| CN103453940A (en) * | 2013-09-13 | 2013-12-18 | 天津理工大学 | Optical fiber sensor based on multi-mode structure |
| CN103822666A (en) * | 2014-03-03 | 2014-05-28 | 中南林业科技大学 | Multi-parameter sensor based on long-period fiber bragg grating and Mach-Zehnder interferometer |
| CN104297208A (en) * | 2014-10-21 | 2015-01-21 | 天津理工大学 | Interferometric optical fiber sensor based on pohotonic crystal optical fiber |
| CN110553987A (en) * | 2019-08-28 | 2019-12-10 | 华中科技大学 | gas detection method and system |
| US10935720B2 (en) * | 2019-04-29 | 2021-03-02 | Ii-Vi Delaware, Inc. | Laser beam product parameter adjustments |
-
2012
- 2012-09-05 CN CN 201220450295 patent/CN202815262U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830464A (en) * | 2012-09-05 | 2012-12-19 | 哈尔滨工程大学 | Double-filtering microstructure beam splitter based on single mode-multimode fiber bragg grating |
| CN103278782A (en) * | 2013-05-17 | 2013-09-04 | 天津理工大学 | Magnetic field sensor based on magnetic fluid and micro-nanofiber evanescent field |
| CN103278782B (en) * | 2013-05-17 | 2016-07-06 | 天津理工大学 | A kind of magnetic field sensor based on magnetic fluid and micro-nano optical fiber evanescent field |
| CN103453940A (en) * | 2013-09-13 | 2013-12-18 | 天津理工大学 | Optical fiber sensor based on multi-mode structure |
| CN103822666A (en) * | 2014-03-03 | 2014-05-28 | 中南林业科技大学 | Multi-parameter sensor based on long-period fiber bragg grating and Mach-Zehnder interferometer |
| CN104297208A (en) * | 2014-10-21 | 2015-01-21 | 天津理工大学 | Interferometric optical fiber sensor based on pohotonic crystal optical fiber |
| US10935720B2 (en) * | 2019-04-29 | 2021-03-02 | Ii-Vi Delaware, Inc. | Laser beam product parameter adjustments |
| CN110553987A (en) * | 2019-08-28 | 2019-12-10 | 华中科技大学 | gas detection method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202815262U (en) | Double-filtering microstructure beam splitter based on singlemode-multimode fiber grating | |
| CN102830464A (en) | Double-filtering microstructure beam splitter based on single mode-multimode fiber bragg grating | |
| CN102721665B (en) | Micro nano optical fiber grating refractive index sensor | |
| CN103439765B (en) | A kind of All-optical-fiber type multi-path interferometer | |
| CN101604048B (en) | All-fiber filter based on thin-core fibers | |
| CN102540322A (en) | Micro-nano fiber grating laser writing method and device | |
| CN102226725B (en) | Inner-wall waveguide long-time cycle fiber grating sensor | |
| CN101832924B (en) | Refractivity sensor and preparation method thereof based on micro-core optical fiber Bragg grating | |
| CN205861241U (en) | A kind of based on spherical structure with the fibre optic temperature sensor of hollow optic fibre | |
| CN101832792A (en) | Optical waveguide sensor and preparation methods thereof | |
| CN201654269U (en) | Making device of arbitrary chirp optical fiber grating | |
| CN103940455A (en) | All-fiber high accuracy sensor based on optical fiber multi-mode interference and application thereof | |
| CN101266319A (en) | Long period optical fibre grating ultraviolet laser point-to-point writing method | |
| CN102053301A (en) | Method for manufacturing sampling fiber grating | |
| CN103605187B (en) | A kind of class double-core photonic crystal fiber tunable optic filter based on selective filling | |
| CN103033883A (en) | Long period fiber grating machining method and long period fiber grating | |
| CN109143468B (en) | On-line tunable optical fiber internal integrated ultrasonic grating | |
| CN204177736U (en) | The trace gas detection device in chamber is swung based on two-way light decay | |
| CN206208755U (en) | Sonde-type refractive index sensing device based on photonic crystal fiber | |
| CN106524935A (en) | Method for measuring strain of double-pass MZ structure fused with long period fiber grating | |
| CN102507497A (en) | Refractive index sensor based on optical fiber and measurement method | |
| CN201181206Y (en) | Strain sensor based on optical fiber with porous micro-structure | |
| CN102494816B (en) | Pressure sensing method based on photonic crystal fibers and sensor | |
| Grenier et al. | Optical circuits in fiber cladding: Femtosecond laser-written bragg grating waveguides | |
| CN201464669U (en) | Interference type fine-core optical fiber wave filter |
Legal Events
| 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: 20130320 Termination date: 20130905 |