CN217425723U - Wave-splitting self-focusing lens - Google Patents
Wave-splitting self-focusing lens Download PDFInfo
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- CN217425723U CN217425723U CN202220563599.XU CN202220563599U CN217425723U CN 217425723 U CN217425723 U CN 217425723U CN 202220563599 U CN202220563599 U CN 202220563599U CN 217425723 U CN217425723 U CN 217425723U
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Abstract
The application provides a wave-splitting self-focusing lens, relates to wavelength division multiplexing technical field, includes: the focusing lens comprises a cylindrical self-focusing lens body, wherein an antireflection film and a wave splitting film are respectively arranged on two end faces of the self-focusing lens body, the self-focusing lens has a preset refractive index, and the material of the wave splitting film is matched with the preset refractive index of the self-focusing lens. The self-focusing lens body is used for completing the collimation/coupling function of an optical signal to a specific wavelength so as to ensure that the signal can efficiently enter a specified transmission system after the filtering/wave combination action; the antireflection film is used for reducing or eliminating the reflected light on the optical surface of the lens, so that the light transmission amount of the lens is increased, and the stray light of a system is reduced or eliminated; the material of the wave division film is matched with the preset refractive index of the self-focusing lens so as to replace the existing filter plate and realize the wavelength division multiplexing/coupling function. The self-focusing lens body has the filtering characteristic, an extra filter is not used, the requirement of a miniaturized scene is met, the environmental reliability is high, and the cost is effectively controlled.
Description
Technical Field
The application relates to the technical field of wavelength division multiplexing, in particular to a wavelength division self-focusing lens.
Background
Commercial communication systems are available on the market, and 90% are optical fiber communication networks. The WDM system (wavelength division multiplexing) is one of the core technologies of the current 5G, and the principle thereof is to realize low-cost capacity expansion of communication signals by multiplexing signals with different wavelengths on one optical fiber. At present, there are four main technologies for implementing WDM, one of which is a dielectric film technology, and the dielectric film technology becomes an important wavelength division multiplexing technology due to its low loss, good temperature stability, and miniaturization of the constituent devices. Since the technology is necessarily related to the collimation/coupling of the optical path signals before and after filtering/wave combination, in the optical path access layer of the WDM system, the basic structure usually uses a self-focusing lens and a filter to combine, thereby completing the wavelength division multiplexing/coupling function.
However, the above techniques also have some objective disadvantages, which are mainly shown in: because the filter plate with the specification below 1.0mm is difficult to cut and process, the application range of the patch WDM lens component is limited, and the device system is difficult to miniaturize; the quality of the filter is uneven, and users generally need to perform full inspection, screening and use, so that additional filter testing equipment is required to be added, and great investment is required; the paster is easy to be attached askew, so that the angle of light incident to the filter medium film is changed, and the filter effect is influenced finally; such as the above, the prior art is affected by the miniaturization, the filtering effect and the cost.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the present application is to provide a wavelength division self-focusing lens, which does not need to additionally use a filter, achieves a wavelength division multiplexing/coupling function by setting a wavelength division film, is suitable for a miniaturized scene, and has a cost effectively controlled.
An aspect of the embodiment of the application provides a wave-splitting self-focusing lens, including the self-focusing lens body of cylinder form, set up antireflection coating and wave-splitting film on two terminal surfaces of self-focusing lens body respectively, self-focusing lens has preset refractive index, the material of wave-splitting film with self-focusing lens's preset refractive index matches.
Optionally, the preset refractive index of the self-focusing lens is between 1.5 and 1.63.
Optionally, the refractive index distribution constant a of the self-focusing lens satisfies: a. the 2 ＝0.1 2 ～2.8 2 。
Optionally, the material of the wave-splitting film comprises titanium dioxide, titanium oxide, titanium pentoxide, tantalum pentoxide, silicon dioxide, niobium pentoxide, zirconium oxide.
Optionally, the thickness of the wave-splitting film is 5000-35000 nm.
Optionally, the wave separation film comprises multiple layers, and the number of the multiple layers of the wave separation film is between 20 and 200.
Optionally, the thickness of the antireflection film is 500-1000 nm.
Optionally, the antireflection film comprises multiple layers, and the number of the multiple layers of antireflection films is 1-6.
According to the wave-splitting self-focusing lens provided by the embodiment of the application, the antireflection film and the wave-splitting film are respectively arranged on the two end faces of the columnar self-focusing lens body, and the self-focusing lens body is used for completing the collimation/coupling function of an optical signal on a specific wavelength so as to ensure that the signal can efficiently enter a specified transmission system after the filtering/wave-combining action; the antireflection film is used for reducing or eliminating reflected light on the optical surface of the lens, so that the light transmission amount of the lens is increased, and stray light of a system is reduced or eliminated; the self-focusing lens has a preset refractive index, and the material of the wave division film is matched with the preset refractive index of the self-focusing lens so as to replace the existing filter plate and realize the wavelength division multiplexing/coupling function. The self-focusing lens body has the filtering characteristic, an additional filter plate is not used, the wave-splitting self-focusing lens provided by the embodiment of the application is suitable for the self-focusing lens with any specification and size, is not limited by the self-focusing lens with a specific size, is suitable for the requirement of a miniaturized scene, does not need to be sealed, is high in environmental reliability, and can be effectively controlled in cost.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a prior art self-focusing lens wavelength division multiplexing scheme;
FIG. 2 is a schematic diagram of a prior art self-focusing lens wavelength division multiplexing scheme;
fig. 3 is a schematic structural diagram of the wavelength-division self-focusing lens provided in this embodiment.
Icon: 10-a self-focusing lens; 11-a filter; 12-an anti-reflection film; 13-a wave-splitting membrane; 100-a self-focusing lens body; 101-an antireflection film; 102-wave splitting membrane.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
It should also be noted that, unless expressly stated or limited otherwise, the terms "disposed" and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, a self-focusing lens 10 is included for collimating/coupling an optical signal to a specific wavelength. Ensuring that the signals can efficiently enter a designated transmission system after the filtering/wave combination action; two sides of the self-focusing lens 10 are covered and deposited with a medium antireflection film 12 according to the requirement of the system wavelength; on the right side is a filtering/multiplexing basic optical element: a filter 11, a substrate material is generally BK7 glass; dielectric films are deposited on two sides of BK7 glass, and one side connected with the lens is a deposited multilayer optical dielectric film (a wave-splitting film 13) which has the filtering characteristics of band-pass for a certain wavelength range and stop band for the other wavelength range, and different wavelengths can be separated or combined by using the narrow-band interference filter 11 with specific wavelength selection characteristics. And an antireflection film 12 is deposited on the other side. The self-focusing lens 10 is sealed by the position a shown in fig. 1, so that the self-focusing lens 10 and the filter plate 11 are combined to form a WDM filter lens assembly. Besides meeting the packaging requirements, the sealing compound has requirements on reliability and operability. The relevant requirements need to satisfy GR-1221-CORE.
The above scheme is schematically illustrated in a filtering/coupling embodiment, as shown in fig. 2, where a multi-carrier communication signal (B-site) is transmitted from an optical fiber into the left WDM autofocus lens 10 assembly. On the end face of the filter 11 (the end with the band-pass filter film), the cut-off band wave is reversely strengthened (cut off and reflected), and then the signal is reversely coupled into the transmission system i (C position) through the optical coupling action of the self-focusing lens 10; meanwhile, at the exit end of the filter 11, the band-pass signal passes through the filter 11 and enters another set of symmetrical WDM lens assemblies, and the band-pass wave is coupled into the transmission system ii (position D) through the optical coupling effect of the self-focusing lens 10. The original multi-channel carrier communication signal is separated into different systems for transmission through the self-focusing lens 10 and the filter 11, and finally extracted for use.
In view of the characteristics of the above solutions, the prior art solutions have the following objective disadvantages:
1) the filter 11 is difficult to cut and process under the specification of 1.0mm, so that the application range of the patch WDM lens assembly is limited. The size of the self-focusing lens 10 is limited to be above the phi 1.8mm specification, so that the device system is difficult to miniaturize.
2) The thickness of the filter 11 is usually 1.0-1.2 mm, the maximum thickness can be 5mm, especially the filter is used in pairs, the system length is increased by 2 mm-10 mm, and the miniaturization of the device system is difficult.
3) The quality of the filter segment 11 is uneven, and users generally need to perform full inspection and screening. The filter plate 11 testing equipment needs to be additionally arranged, and the investment is very high.
4) The filter 11 is expensive, and in order to reduce the loss, the filter is often used with the pigtail wiring of different specifications. Besides the extra cost of manual wiring, the cost of special pitch pittail is increased.
5) The lens patch is low in labor efficiency, generally only 300-500 pcs/day, and the labor cost of the patch is too high. The chip mounter is used for great investment.
6) The consistency of the sealing structure is poor, and the asymmetrical sealing structure is easy to cause temperature-related index change.
7) The patch is easy to be pasted askew, so that the angle of light incident to the filter medium film is changed. The filtering effect is finally affected (the film effect is related to the incident angle of the light ray).
8) The assembly uses glue, and the environmental reliability is inferior to that of a glue-free process; and the used American glue is expensive, and is harsh on use conditions, storage conditions and transportation conditions, so that the management difficulty and the cost are increased.
9) The filter plate 11 is usually plated in its entirety, preferably cut locally as required. Mainly because the substrate is slightly distorted when the internal stress of the film layer becomes large, which causes the problem of polarization mode dispersion. The waste of material results in a higher cost for the high performance filter 11.
To solve the above problem, an embodiment of the present invention provides a wave-splitting self-focusing lens, as shown in fig. 3, including: the self-focusing lens comprises a cylindrical self-focusing lens body 100, wherein an antireflection film 101 and a wave splitting film 102 are respectively arranged on two end faces of the self-focusing lens body 100, the self-focusing lens has a preset refractive index, and the material of the wave splitting film 102 is matched with the preset refractive index of the self-focusing lens.
The self-focusing lens is also called gradient variable refractive index lens, which means a cylindrical optical lens with the refractive index distribution gradually changed along the radial direction, and has focusing and imaging functions.
The self-focusing lens has the following characteristic that when light rays travel in air and encounter different media, the traveling direction of the light rays can be changed due to the difference of the refractive indexes of the media. The conventional lens imaging is to focus light into a point by controlling the curvature of the lens surface by using the generated optical path difference. The self-focusing lens is different from a common lens in that the self-focusing lens material can refract light transmitted along the axial direction and gradually reduce the distribution of the refractive index along the radial direction, so that emergent light rays are smoothly and continuously converged to one point.
The antireflection film 101 and the wave splitting film 102 are respectively arranged on the two cylinder end faces of the self-focusing lens body 100, and the self-focusing lens body 100 plays a role in finishing the collimation/coupling function of an optical signal to a specific wavelength so as to ensure that the signal can efficiently enter a specified transmission system after the filtering/wave combining action; the antireflection film 101 is used to reduce or eliminate the reflected light from the optical surface of the lens, thereby increasing the light transmission of the lens and reducing or eliminating the stray light of the system. The functions of the self-focusing lens body 100 and the antireflection film 101 are substantially the same as those of the prior art, and are not described herein.
The present application uses the wavelength division film 102 to replace the filter 11 in the prior art, and the implementation principle is to use the characteristics of the self-focusing lens to match the corresponding wavelength division film 102 under the condition of the preset refractive index, in other words, the material of the wavelength division film 102 is matched with the preset refractive index of the self-focusing lens, so as to implement the wavelength division multiplexing/coupling function.
Since the self-focusing lens body 100 of the present application has a filtering characteristic, the additional filter 11 is not used, and the self-focusing lens body 100 with a predetermined refractive index is matched with the wavelength division film 102 made of a specific material, so that the following effects are achieved: the filter bandwidth is 0.4 nm-200 nm, the transmission efficiency is more than 95%, and the isolation is more than 30 dB; the self-focusing lens with the filtering function can be applied to microminiature products with phi 0.5mm and phi 1.0 mm; compared with the prior art, the structural size of the assembly system is reduced by 20% in the same type of lens products; because the filter 11 is not used, the testing time, the mounting time, the wiring time and the time for plating the antireflection film 101 for the lens of the filter 11 are saved, and the time can be saved by 37 percent in the whole production process from the lens to the WDM lens assembly; the cost is saved by not less than 20 percent; no sealing glue is needed, and the product obtained by the method is free of glue and high in environmental reliability; the number of filter segments 11 and associated interfaces is reduced and a single set of lens assemblies can optimize insertion loss by 0.05 dB.
Therefore, according to the wave-splitting self-focusing lens provided by the embodiment of the application, the antireflection film 101 and the wave-splitting film 102 are respectively arranged on two end faces of the columnar self-focusing lens body 100, and the self-focusing lens body 100 is used for completing the collimation/coupling function of an optical signal to a specific wavelength so as to ensure that the signal can efficiently enter a specified transmission system after the filtering/wave-combining function is performed on the signal; the antireflection film 101 is used for reducing or eliminating the reflected light of the optical surface of the lens, so that the light transmission amount of the lens is increased, and the stray light of the system is reduced or eliminated; the self-focusing lens has a preset refractive index, and the material of the wavelength division film 102 is matched with the preset refractive index of the self-focusing lens to replace the existing filter 11, so that the wavelength division multiplexing/coupling function is realized. The self-focusing lens body 100 has a filtering characteristic, and does not use an additional filter 11, and the wavelength-division self-focusing lens provided by the embodiment of the application is suitable for self-focusing lenses of any specification and size, is not limited to the self-focusing lens of a specific size (such as phi 1.8mm), is suitable for the requirement of a miniaturized scene, does not need to be sealed, has high environmental reliability, and can effectively control the cost.
Furthermore, the preset refractive index of the self-focusing lens is 1.5-1.63, and the wavelength division film 102 matched with the preset refractive index can specifically adopt titanium dioxide (TiO) 2 ) Titanium oxide (TiO), titanium pentoxide (Ti) 2 O 5 ) Tantalum pentoxide (Ta) 2 O 5 ) Silicon dioxide (SiO) 2 ) Niobium pentoxide (Nb) 2 O 5 ) Zirconium oxide (ZrO), and the like. Thus, the wavelength division multiplexing/coupling function can be realized more favorably.
The refractive index distribution constant A of the self-focusing lens satisfies: a. the 2 ＝0.1 2 ～2.8 2 The self-focusing lens utilizes the change characteristic that the gradient change refractive index distribution is gradually reduced along the radial direction, and the refractive index distribution constant A of the self-focusing lens represents the radial distribution constant of the self-focusing lens and corresponds to the preset refractive index, so that a refractive index distribution curve can be obtained.
In addition, the total thickness of the wave-splitting film 102 is 5000-35000 nm, the wave-splitting film 102 is arranged on the end face of the self-focusing lens body 100 in a plating mode, the wave-splitting film 102 comprises a plurality of layers, and the number of the layers of the multi-layer wave-splitting film 102 is 20-200.
Similarly, the total thickness of the antireflection film 101 is 500-1000 nm, the antireflection film 101 comprises a plurality of layers, and the number of the layers of the multilayer antireflection film 101 is 1-6.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A wave splitting, self-focusing lens, comprising: the self-focusing lens comprises a cylindrical self-focusing lens body, wherein an antireflection film and a wave splitting film are respectively arranged on two end faces of the self-focusing lens body, the self-focusing lens has a preset refractive index, and the material of the wave splitting film is matched with the preset refractive index of the self-focusing lens.
2. The wave-splitting self-focusing lens according to claim 1, wherein the preset refractive index of the self-focusing lens is between 1.5 and 1.63.
3. The wavelength-division self-focusing lens according to claim 1, wherein the refractive index distribution constant a of the self-focusing lens satisfies: a. the 2 ＝0.1 2 ～2.8 2 。
4. The wave-splitting self-focusing lens according to claim 2, wherein the material of the wave-splitting film comprises titanium dioxide, titanium oxide, titanium pentoxide, tantalum pentoxide, silicon dioxide, niobium pentoxide, zirconium oxide.
5. The wave-splitting self-focusing lens according to claim 1, wherein the thickness of the wave-splitting film is 5000-35000 nm.
6. The wave-splitting self-focusing lens according to claim 5, wherein the wave-splitting film comprises a plurality of layers, and the number of the layers of the wave-splitting film is between 20 and 200.
7. The wave-splitting self-focusing lens according to claim 1, wherein the thickness of the antireflection film is 500 to 1000 nm.
8. The wave-splitting self-focusing lens according to claim 7, wherein the antireflection film comprises a plurality of layers, and the number of the layers of the antireflection film is between 1 and 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220563599.XU CN217425723U (en) | 2022-03-15 | 2022-03-15 | Wave-splitting self-focusing lens |
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| CN202220563599.XU CN217425723U (en) | 2022-03-15 | 2022-03-15 | Wave-splitting self-focusing lens |
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| CN217425723U true CN217425723U (en) | 2022-09-13 |
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