CN213365087U - Optical filtering system for multiple filtering - Google Patents
Optical filtering system for multiple filtering Download PDFInfo
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- CN213365087U CN213365087U CN202021837217.5U CN202021837217U CN213365087U CN 213365087 U CN213365087 U CN 213365087U CN 202021837217 U CN202021837217 U CN 202021837217U CN 213365087 U CN213365087 U CN 213365087U
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Abstract
The application discloses an optical filtering system for multiple filtering, which comprises an input collimation tail fiber, a multi-fiber core collimator, a collimation lens, an optical filtering assembly and a first reflector which are sequentially arranged along the propagation direction of a light beam; the number of the input collimation tail fibers is at least two, the fiber cores which are coupled with the input collimation tail fibers in a one-to-one correspondence mode are arranged in the multi-fiber core collimator, and the fiber cores are arranged into a central symmetry structure.
Description
Technical Field
The application relates to the technical field of optics, in particular to an optical filtering system for multiple filtering.
Background
Currently, optical filters are wavelength selective devices that select a desired wavelength from a plurality of wavelengths, and light other than that wavelength is rejected. It can be used for optical wavelength selection, noise filtering of optical amplifier, gain equalization, optical multiplexing/demultiplexing, optical performance detection, etc. Optical filters are widely varied, and can be roughly classified into low-pass filters, band-pass filters, high-pass filters, cosmetic filters, and the like, narrow-band filters, and the like in terms of output spectrum; in principle, the filter can be roughly divided into a filter with a light splitting device such as a grating as a core, a filter with a plated film as a core, and the like.
In the optical filter in the prior art, due to design factors such as aberration and manufacturing process factors such as coupling, after one-time filtering, the performance of partial indexes such as bandwidth and optical signal to noise ratio is poor, and the application requirement cannot be met.
SUMMERY OF THE UTILITY MODEL
The application provides an optical filtering system with multiple filtering, which aims to solve the problem that the optical filter in the prior art cannot meet the application requirement due to the fact that after one filtering, partial indexes such as bandwidth and optical signal to noise ratio are poor due to design factors such as aberration and manufacturing process factors such as coupling.
The application provides an optical filtering system for multiple filtering, which comprises an input collimation tail fiber, a multi-fiber core collimator, a collimation lens, an optical filtering assembly and a first reflector, wherein the input collimation tail fiber, the multi-fiber core collimator, the collimation lens, the optical filtering assembly and the first reflector are sequentially arranged along the propagation direction of a light beam; the number of the input collimation tail fibers is at least two, fiber cores which are correspondingly coupled with the input collimation tail fibers one by one are arranged in the multi-fiber-core collimator, and the fiber cores are arranged into a central symmetrical structure.
When the optical filtering system with multiple filtering works, light beams enter the optical filtering system through the collimator tail fiber, then respectively pass through the fiber core collimator, the collimating lens and the optical filtering component and reach the first reflector, and reflected light beams sequentially pass through the first reflector, the optical filtering component, the collimating lens and the multi-fiber core collimator and reach the other collimator tail fiber; the fiber core collimator can be connected in series with a plurality of fiber core pairs meeting the optical coupling condition through proper optical coupling and fiber core meeting requirements of a multi-fiber core collimator arranged into a central symmetrical structure, so that an incident beam passes through the same filtering system for a plurality of times, the purpose of remarkably optimizing the filtering performance is achieved, and the cost of a filter can be obviously reduced.
The optical filtering system for filtering for multiple times can achieve the following beneficial effects:
the utility model provides an optical filter system of many times filtering, can solve prior art's optical filter, because design factors such as aberration and preparation process factors such as coupling, after once filtering, some indexes are relatively poor like bandwidth, performance such as SNR, reach the problem of application requirement, it is for prior art, light path connection structure is simple more reasonable, through this lower cost-push of many fine core collimators, and then show and promote the filtering system performance, it can realize the same filtering system of the repetitious passage of incident light, make the bandwidth of the filtering spectrum that arrives, performance such as SNR obtain showing the optimization, and can reduce manufacturing cost and the preparation process degree of difficulty.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of a multi-filtering optical filtering system according to the present application.
Fig. 2 is a schematic structural diagram of a linearly arranged core collimator of the multi-filtering optical filtering system of the present application.
Fig. 3 is a schematic diagram of a rectangular arrangement of core collimators for a multiple-pass optical filter system according to the present application.
Fig. 4 is a schematic diagram of a circularly arrayed fiber core collimator of the multi-pass optical filter system of the present application.
In the figure, 1 is an input collimation tail fiber, 2 is a multi-fiber core collimator, 3 is a collimation lens, 4 is an optical filter component, 5 is a first reflector, 201 is a fiber core, 2011 is a first fiber core, 2012 is a second fiber core, 2013 is a third fiber core, 2014 is a fourth fiber core, 2015 is a fifth fiber core, and 2016 is a sixth fiber core.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Example 1
An optical filtering system with multiple filtering, please see fig. 1, includes an input collimating pigtail 1, a multi-fiber core collimator 2, a collimating lens 3, an optical filtering component 4 and a first reflector 5, which are sequentially arranged along a light beam propagation direction; the number of the input collimation tail fibers 1 is at least two, fiber cores 201 which are coupled with the input collimation tail fibers 1 in a one-to-one correspondence mode are arranged in the multi-fiber-core collimator 2, and the fiber cores 201 are arranged into a central symmetry structure.
In the multi-filtering optical filtering system of this embodiment, the plurality of fiber cores 201 of the multi-fiber core collimator 2 are arranged in a central symmetrical structure, and coupled with the collimating lens 3, the optical filtering component 4 and the first reflecting mirror 5, so that when any one of the fiber ends is allowed to enter the optical filtering system, the other corresponding fiber end can always receive reflected light. The optical fiber head properly connected with the multi-fiber core collimator 2 can realize that incident light passes through the optical filtering system for multiple times, so that the bandwidth, the optical signal-to-noise ratio and other performances of the obtained filtering spectrum are remarkably improved. In the reflective optical filtering system, a plurality of fiber core pairs meeting optical coupling conditions can be connected in series through appropriate optical coupling and the multi-fiber core collimator 2 meeting the structural symmetry, so that incident light passes through the same optical filtering system for multiple times, the purpose of remarkably optimizing the filtering performance is achieved, and the cost of the filter can be obviously reduced.
Example 2
In the optical filtering system with multiple filtering, based on embodiment 1, please see fig. 2, the fiber cores 201 of the multi-core collimator 2 are arranged in a straight line.
Since light travels straight, if a pair of cores A, B satisfy the optical coupling condition, the light transmission path in the other pair of fibers C, D that is symmetrical to the pair of cores A, B is completely symmetrical to the light transmission path in A, B, and theoretically, the fibers C, D also satisfy the optical coupling condition.
More specifically, the fiber cores 201 of the multi-core collimator 2 are arranged in a straight line as shown in fig. 2, and in the optical filter system shown in fig. 1, coupled with a suitable first reflector 5, the reflected light will exit from the fiber core 201 that is circularly symmetric to the fiber core 201 when the incident light enters from any fiber core 201, wherein when the optical filter assembly 4 includes a beam expanding lens group, the spherical center of the beam expanding lens group is required to be aligned with the spherical center of the collimating lens 3. In particular, when the collimator lens 3 is an aspherical lens, when the pair of cores 201 is structurally symmetrical to the other pair of cores 201 satisfying the optical coupling condition, the pair of cores 201 also satisfies the optical coupling condition. As shown in fig. 2, when the first-number fiber core 2011 and the fourth-number fiber core 2014 satisfy the optical coupling condition, the second-number fiber core 2012 and the third-number fiber core 2013 which satisfy circular symmetry also satisfy the optical coupling condition; when the first fiber core 2011 and the third fiber core 2013 meet the optical coupling condition, the second fiber core 2012 and the fourth fiber core 2014 which meet the symmetrical structure also meet the optical coupling condition, namely, the incident light can sequentially pass through the first fiber core 2011, the fourth fiber core 2014, the second fiber core 2012, the third fiber core 2013 or other fiber cores 201 in series, and can also sequentially pass through the first fiber core 2011, the third fiber core 2013, the second fiber core 2012, the fourth fiber core 2014 or other fiber cores 201 in series, so that the performance of the optical filtering system is optimized after the incident light passes through the optical filtering system for multiple times; the above-described structure of this embodiment includes, but is not limited to, the multi-core collimator 2 of four cores 201, which is applicable to a multi-core collimator 2 including any plurality of cores 201 arranged in a straight line.
Example 3
In the optical filtering system with multiple filtering, based on embodiment 1, please see fig. 3, the fiber cores 201 of the multi-core collimator 2 are arranged in a rectangle.
More specifically, the cores 201 of the multi-core collimator 2 are arranged in a rectangular shape as shown in fig. 3, and similarly to embodiment 2, when one pair of cores 201 is structurally symmetrical to another pair of cores 201 that satisfy the optical coupling condition, the pair of cores 201 also satisfy the optical coupling condition. As shown in fig. 3, when the first-number core 2011 and the sixth-number core 2016 satisfy the optical coupling condition, the second-number core 2012 and the fifth-number core 2015, which satisfy circular symmetry, and the third-number core 2013 and the fourth-number core 2014 also satisfy the optical coupling condition; when the first fiber core 2011 and the fourth fiber core 2014 meet the optical coupling condition, the second fiber core 2012 and the third fiber core 2013 which meet the symmetric structure, or the third fiber core 2013 and the sixth fiber core 2016 also meet the optical coupling condition, namely, the incident light can sequentially pass through the first fiber core 2011, the sixth fiber core 2016, the second fiber core 2012, the fifth fiber core 2015, the third fiber core 2013, the fourth fiber core 2014 or other series connection modes, and can sequentially pass through the first fiber core 2011, the fourth fiber core 2014, the third fiber core 2013, the second fiber core 2012 or other series connection modes, so that the incident light passes through the optical filter system for multiple times to optimize the performance. Particularly, when the collimator lens 3 is a cylindrical lens, if the first fiber core 2011 and the second fiber core 2012 meet the optical coupling condition, the third fiber core 2013, the fourth fiber core 2014, and the fifth fiber core 2015 and the sixth fiber core 2016 which meet the symmetric structure also meet the optical coupling condition, that is, the incident light can sequentially pass through the first fiber core 2011, the second fiber core 2012, the third fiber core 2013, the fourth fiber core 2014, the fifth fiber core 2015, and the sixth fiber core 2016 or other series connection modes. The solution of this embodiment includes, but is not limited to, 2 × 3 two rows and three columns or three rows and two columns of the fiber core collimators 2 in a rectangular arrangement structure, and similarly, any M × N rectangular arrangement of the multi-fiber core collimators 2 satisfies the solution structure of this embodiment.
Example 4
An optical filtering system with multiple filtering is disclosed in embodiment 1, please refer to fig. 4, wherein the fiber cores 201 of the multi-core collimator 2 are arranged in a circular ring shape.
More specifically, the cores 201 of the multi-core collimator 2 are arranged in a circular ring shape as shown in fig. 4, and similarly to embodiment 2, when one pair of cores 201 is structurally symmetrical to another pair of cores 201 that satisfy the optical coupling condition, the pair of cores 201 also satisfy the optical coupling condition. As shown in fig. 4, when the first-number core 2011 and the fourth-number core 2014 satisfy the optical coupling condition, the second-number core 2012 and the fifth-number core 2015 which satisfy circular symmetry, and the third-number core 2013 and the sixth-number core 2016 also satisfy the optical coupling condition; when the first fiber core 2011 and the second fiber core 2012 meet the optical coupling condition, the fifth fiber core 2015 and the fourth fiber core 2014 which meet the symmetrical structure also meet the optical coupling condition, namely, incident light can sequentially pass through the first fiber core 2011, the fourth fiber core 2014, the second fiber core 2012, the fifth fiber core 2015, the third fiber core 2013, the sixth fiber core 2016 or other fiber core series connection modes, and can also sequentially pass through the first fiber core 2011, the third fiber core 2013, the fifth fiber core 2015, the fourth fiber core 2014 or other fiber core series connection modes, so that the incident light passes through the optical filtering system for multiple times to optimize the performance. The solution of this embodiment includes, but is not limited to, the annular multi-core collimator 2 with six cores 201, and the annular multi-core collimator 2 with any N cores 201 satisfies the solution structure of this embodiment.
Example 5
A multiple-pass optical filter system is similar to any of the embodiments described above, except that the optical filter assembly 4 includes an optical device having beam expanding capability. The optical device with beam expanding capability is a prism group or a lens group.
Alternatively, the optical filter assembly 4 includes an optical device having a light splitting capability. The optical device with light splitting capability is a grating or a prism.
Alternatively, the optical filter assembly 4 comprises a second mirror with adjustable angle, such as Micro-Electro-Mechanical MEMS (Micro-Electro-Mechanical System) or the like. It should be noted that the filter assembly 4 with the second mirror with adjustable angle can realize the wavelength tuning of the filter, and when the optical device is a lens assembly, it needs to be aligned with the spherical center of the collimating lens 3 during assembly to satisfy the optical coupling condition during wavelength tuning.
Further, the first mirror 5 is an angularly adjustable mirror. Which functions as the angularly adjustable second mirror of the filter assembly 4, the wavelength tuning of the optical filter system can be achieved.
I.e. most preferably the relative position and angle of the components of the optical path, can be adjusted so that the optical filter system meets the optical coupling condition, i.e. optical power insertion loss is minimal.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An optical filtering system for multiple filtering comprises an input collimation tail fiber (1), a multi-fiber core collimator (2), a collimation lens (3), an optical filtering component (4) and a first reflector (5) which are sequentially arranged along the propagation direction of a light beam; the number of the input collimation tail fibers (1) is at least two, and the input collimation tail fibers are characterized in that fiber cores (201) which are correspondingly coupled with the input collimation tail fibers (1) one by one are arranged in the multi-fiber-core collimator (2), and the fiber cores (201) are arranged into a central symmetrical structure.
2. Multiple-filtered optical filter system according to claim 1, in which the cores (201) of the multi-core collimator (2) are arranged in a straight line.
3. Multiple-filtered optical filter system according to claim 1, in which the cores (201) of the multi-core collimator (2) are arranged in a rectangle.
4. Multiple-filtered optical filter system according to claim 1, in which the cores (201) of the multi-core collimator (2) are arranged in a circular ring.
5. Multiple-pass optical filter system according to claim 1, in which the optical filter assembly (4) comprises an optical device with beam expanding capability.
6. The multiple-filtered optical filter system of claim 5, wherein the optical device with beam expanding capability is a set of prisms or lenses.
7. Multiple-filtered optical filter system according to claim 5, in which the optical filter component (4) comprises an optical device with light splitting capability.
8. The multi-pass optical filter system of claim 7 wherein the optical device having a light splitting capability is a grating or a prism.
9. Multiple-pass optical filter system according to claim 1, characterised in that the optical filter assembly (4) comprises a second mirror which is angularly adjustable.
10. Multiple-pass optical filter system according to claim 1, characterized in that the first mirror (5) is an angularly adjustable mirror.
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| CN202021837217.5U CN213365087U (en) | 2020-08-28 | 2020-08-28 | Optical filtering system for multiple filtering |
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| CN202021837217.5U CN213365087U (en) | 2020-08-28 | 2020-08-28 | Optical filtering system for multiple filtering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114966984A (en) * | 2022-06-01 | 2022-08-30 | 深圳市欧亿光电技术有限公司 | Narrow-band tunable optical filter design |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114966984A (en) * | 2022-06-01 | 2022-08-30 | 深圳市欧亿光电技术有限公司 | Narrow-band tunable optical filter design |
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