Single-side array WDM structure based on micro-lens
阅读说明：本技术 一种基于微透镜的单边阵列式wdm结构 (Single-side array WDM structure based on micro-lens ) 是由 杨栋 孔祥君 白永杰 于 2020-06-28 设计创作，主要内容包括：本发明公开了一种基于微透镜的单边阵列式WDM结构,所述基于微透镜的单边阵列式WDM结构包括光纤阵列、微透镜阵列,光纤阵列与玻璃基底座设有滤波片的一侧对向设置；其中,光纤阵列由多根单纤均匀排列而成；微透镜阵列由玻璃基底座、微透镜和滤波片组成,微透镜和滤波片分列玻璃基底座的两侧。本发明提供的基于微透镜的单边阵列式WDM结构,基于集成化的思想,将多次对光整合为一次对光,大大降低了人工成本；同时,相较于传统的膜片式WDM器件,该结构将准直器代替为成本更低的单纤阵列和微透镜阵列,并完全省去准直器,大大降低了材料成本,节省了器件的占用空间。(The invention discloses a single-side array type WDM structure based on a micro lens, which comprises an optical fiber array and a micro lens array, wherein the optical fiber array and one side of a glass substrate base provided with a filter plate are arranged in an opposite way; the optical fiber array is formed by uniformly arranging a plurality of single fibers; the micro lens array consists of a glass substrate seat, micro lenses and filters, and the micro lenses and the filters are arranged on two sides of the glass substrate seat in rows. The single-side array WDM structure based on the micro-lens integrates multiple pairs of lights into one pair of lights based on the concept of integration, thereby greatly reducing the labor cost; meanwhile, compared with the traditional diaphragm type WDM device, the structure replaces the collimator with a single fiber array and a micro lens array with lower cost, and completely omits the collimator, thereby greatly reducing the material cost and saving the occupied space of the device.)
1. A microlens-based single-sided array WDM structure comprising:
the optical fiber array is formed by uniformly arranging a plurality of single fibers, and the distance between every two adjacent single fibers is a first preset value;
the micro-lens array comprises a glass substrate base, wherein a plurality of uniformly arranged filter plates are arranged on one side of the glass substrate base, and the distance between every two adjacent filter plates is a second preset value; a plurality of uniformly arranged micro lenses are arranged on the other side of the glass substrate base, and the space between every two adjacent micro lenses is a third preset value; covering a reflecting film on the surface of the micro lens;
the optical fiber array and one side of the glass substrate base, which is provided with the filter, are arranged oppositely.
2. The microlens-based single-sided array WDM structure of claim 1, wherein the microlenses are hemispherical.
3. The microlens-based single-sided array WDM structure of claim 1, wherein the microlenses have a higher refractive index than the glass substrate holder, and the focal length of the microlenses coincides with the thickness of the glass substrate holder.
4. The microlens-based single-sided array WDM structure of claim 1, wherein the first, second and third preset values are all equal.
5. The microlens-based single-sided array WDM structure of claim 1, wherein the glass substrate holder is rectangular.
6. The microlens-based single-sided array WDM structure of claim 1, wherein the light angle of a single fiber in the fiber array is at a predetermined angle with respect to the horizontal.
7. The microlens-based single-sided array WDM structure of claim 1, wherein the number of the single fibers, the filters, and the microlenses is the same.
8. The microlens-based single-sided array WDM structure of claim 1, wherein a thickness of the glass substrate holder is a predetermined thickness, and a curvature of the microlens is a predetermined curvature; the incident light passing through the glass substrate holder and the microlens is located on the same focal plane as the reflected light passing through the glass substrate holder and the microlens.
9. The microlens-based single-sided array WDM structure of claim 8, wherein the filters and the microlenses are distributed in a staggered arrangement.
10. The microlens-based single-sided array WDM structure according to any one of claims 1 to 9, wherein the reflective film is a single integral layer covering the surface of the glass substrate holder and located on the side where the microlenses are located.
Technical Field
The invention relates to the field of optical fiber communication, in particular to a single-side array type WDM structure based on a micro lens.
Background
Wdm (wavelength Division multiplexing), which is a technology for coupling optical carrier signals of various wavelengths to the same optical fiber of an optical line for transmission after being combined together by a multiplexer at a transmitting end.
Most of the existing WDM devices are formed by cascading three-port devices, wherein each three-port device mainly comprises a collimator and a filter. WDM devices usually adopt two ways in implementation, one is that each three-port device needs to be manually operated before cascading, but the labor cost is very high; the other is to abandon the glass tube structure, and directly aim the reflected light at the next stage collimator through the filter plate, but has extremely high operation requirements on operators and very low light-aiming efficiency. Therefore, the above solutions have problems in personnel cost and light efficiency, and simultaneously, the solutions do not leave the need of using a large amount of collimators, thereby increasing the cost of raw materials.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a single-side array WDM structure based on micro-lenses, which is based on the idea of integration, integrates multiple pairs of lights into one pair of lights, and greatly reduces the labor cost; meanwhile, compared with the traditional diaphragm type WDM device, the structure replaces the collimator with a single fiber array and a micro lens array with lower cost, and completely omits the collimator, thereby greatly reducing the material cost and saving the occupied space of the device.
A microlens-based single-sided array WDM structure comprising:
the optical fiber array is formed by uniformly arranging a plurality of single fibers, and the distance between every two adjacent single fibers is a first preset value;
the micro-lens array comprises a glass substrate base, wherein a plurality of uniformly arranged filter plates are arranged on one side of the glass substrate base, and the distance between every two adjacent filter plates is a second preset value; a plurality of uniformly arranged micro lenses are arranged on the other side of the glass substrate base, and the space between every two adjacent micro lenses is a third preset value; covering a reflecting film on the surface of the micro lens;
the optical fiber array and one side of the glass substrate base, which is provided with the filter, are arranged oppositely.
Optionally, the microlenses are hemispherical.
Optionally, the refractive index of the micro lens is higher than that of the glass substrate base, and the focal length of the micro lens is consistent with the thickness of the glass substrate base.
Optionally, the first preset value, the second preset value, and the third preset value are all equal.
Optionally, the glass substrate holder is rectangular.
Optionally, the light angle of a single fiber in the optical fiber array forms a preset angle with a horizontal line.
Optionally, the number of the single fibers, the number of the filters, and the number of the microlenses are the same.
Optionally, the thickness of the glass substrate holder is a preset thickness, and the curvature of the microlens is a preset curvature; the incident light passing through the glass substrate holder and the microlens is located on the same focal plane as the reflected light passing through the glass substrate holder and the microlens.
Optionally, the filter and the microlenses are distributed in a staggered arrangement.
Optionally, the reflecting film is a single integral layer covering the surface of the glass substrate base and located on the side where the micro lens is located.
The invention provides a single-side array WDM structure based on micro-lenses, which comprises two array structures, wherein one sides of an optical fiber array and a micro-lens array band filter are oppositely arranged; because the angles of the single fibers in the optical fiber array are consistent and the intervals are uniform, the micro lens array which is arranged opposite to the single fibers can be obtained according to the angles and the intervals; in the light focusing process, the single fibers in the optical fiber array correspond to the filter plates of the micro lens array one by one, based on the corresponding structures of the two arrays, the light focusing of all the single fibers can be completed through one-time light focusing, meanwhile, a reflecting film is attached to one side where the micro lens is located, the reflecting film has the function of reflecting light rays, and based on the incident light angle of the single fibers, the positions where the filter plates and the micro lens are arranged and the included angle formed by the filter plates and the micro lens, the light focusing process of the whole WDM structure can be completed by means of the reflecting effect of the reflecting film.
The WDM structure provided by the invention adopts the integration idea, the repeated structural relationship in the light focusing process is integrated before the light focusing, and the array structure is utilized to integrate the multiple light focusing processes into one light focusing, so that the light focusing speed and accuracy are greatly increased, and the light focusing work of the whole device can be completed by one light focusing of the light focusing staff. Meanwhile, a micro-lens array structure is innovatively introduced, a collimator is completely replaced, the light splitting effect of the device is improved, the size of the device is greatly reduced, and the material cost of the device is greatly reduced.
The WDM structure provided by the invention successfully realizes the separation effect on incident light with different wavelengths, so that each wavelength of light enters different optical fibers respectively. Meanwhile, no matter the optical fiber enters the coupler or the single fiber, the optical fiber is coupled through the convergence effect of the lens, the coupling efficiency is greatly improved, and the insertion loss of the device is reduced.
Drawings
FIG. 1 is a schematic diagram of a single-sided array WDM structure based on micro-lenses according to an embodiment of the present invention;
FIG. 2 is a top view of a microlens array in an embodiment of the invention;
FIG. 3 is a schematic diagram illustrating a reflection path of incident light according to an embodiment of the present invention;
the reference numbers in the drawings of the specification are as follows:
1. an optical fiber array; 11. a single fiber; 2. a microlens array; 21. a glass substrate holder; 22. a filter plate; 23 micro lenses; 3. a reflective film; 4. the incident light is a single fiber.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A microlens-based single-sided array WDM structure is shown in FIGS. 1 to 3. A microlens-based single-sided array WDM structure includes:
the
the
the optical fiber array and one side of the glass substrate base provided with the filter are arranged oppositely.
The single fibers in the optical fiber array are uniformly arranged at intervals, have the same distance from each other and are first preset values which can be flexibly set; according to the number and the spacing of the single fibers, the spacing of the micro lenses can be obtained through calculation, and the micro lens array is manufactured. Preferably, the number of the single fibers, the number of the filters and the number of the micro lenses are the same, and the first preset value, the second preset value and the third preset value are equal, so that the array structure can be conveniently manufactured in a standardized manner.
The microlens array is preferably rectangular and vertically disposed.
The micro lens is preferably a hemispherical structure processed on the substrate base, the refractive index of the micro lens is higher than that of the glass substrate, and the focal length of the micro lens is consistent with the thickness of the glass of the substrate base, namely, the focal point formed by parallel light passing through the micro lens is just positioned on the rear surface of the glass, so that the performance of the micro lens is similar to that of a convex lens, and the micro lens has a strong convergence effect on light.
The incident light single fiber 4 is used as an input light source to be subjected to wavelength division multiplexing, is positioned on the left side of the microlens array and is approximately a point light source with a fixed divergence angle, and the incident light is incident into the microlens array at an inclined angle, namely the incident light has a certain inclined angle with the horizontal line, so that the incident light can be adjusted according to the light requirement in practical application.
In the light focusing process, the transverse distance from the light source to the micro lens is the same as the focal length of the micro lens, namely the light source is positioned on the focal plane of the micro lens; because the filter plate plays the effect of filtering the light, microlens plays the spotlight effect, and the reflectance coating has the reflection effect, consequently, under the fixed condition in reflectance coating position, the position of adjustment filter plate and microlens can form the light reflection route of different contained angles to in order to realize the reflection of light or see through. Preferably, the reflecting film is a single whole layer covering on one side of the glass substrate base where the micro-lens is located, so as to be convenient for manufacturing.
The reflection path of the incident light is shown in fig. 3, where a is the incident light including multiple wavelengths; when A enters the micro-lens array and reaches the first micro-lens and the reflecting film covered behind the micro-lens, the A directly reaches the next stage of filter after being reflected by the reflecting film (the filter has the functions of reflecting and transmitting different wavelengths); transmitting A1 with specific wavelength and reflecting A2 with the rest wavelength to the next-stage micro lens; similarly, the a2 is reflected by the reflective film and then directed to the next stage of filter, and the A3 with specific wavelength is transmitted and the a4 with the rest of wavelengths is reflected to the next stage of microlens, and so on.
For example, if the incident light includes three
It can be understood that, repeating this structure, but according to actual partial wave needs and set gradually the specific wavelength's of filterable wave filter on the left side of microlens array, the realization that can be convenient is to the light.
Further, in one embodiment, the thickness of the glass substrate holder is a predetermined thickness, and the curvature of the micro-lens is a predetermined curvature; the incident light passing through the glass substrate holder and the microlens is located on the same focal plane as the reflected light passing through the glass substrate holder and the microlens. That is, the incident light and the reflected light are in the same focal plane (as in fig. 3, the incident light a and the reflected light a are located on the same focal plane), so that the reflected light can be prevented from moving forward or backward, and the light focusing effect can be prevented from being affected. The control of the focal plane depends mainly on the curvature of the microlenses, while the thickness of the glass substrate holder can be calculated from the curvature of the microlenses. Specifically, the distance from the focal plane to the microlens (i.e., the focal plane position) can be adjusted by selecting microlenses of different curvatures, and the thickness to be taken by the glass substrate holder can be determined according to the fact that the distance from the focal plane to the microlens is equal to the thickness of the glass substrate holder.
Accordingly, in practice, for a glass substrate holder with a certain thickness, the curvature of the microlens to be used can be deduced according to the mapping relationship among the curvature of the microlens, the focal plane distance, and the thickness of the glass substrate holder.
Because the single fibers on the left side have consistent angles and are arranged in parallel in the multi-stage structure, the adjacent intervals can be obtained through calculation, and the optical fiber array is manufactured in advance. Similarly, the microlens pitch can be calculated to produce a microlens array. Namely, the process of multiple light focusing in the prior art is changed, and the light focusing process of the whole device can be realized by one light focusing of two arrays.
The single-sided microlens-based WDM structure of the present invention is described above to help understanding of the present invention, but the embodiments of the present invention are not limited by the above-mentioned examples, and any changes, modifications, substitutions, combinations, and simplifications that do not depart from the principle of the present invention are all equivalent substitutions and are included in the scope of the present invention.
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