CN210605095U - Optical module - Google Patents
Optical module Download PDFInfo
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- CN210605095U CN210605095U CN201921262760.4U CN201921262760U CN210605095U CN 210605095 U CN210605095 U CN 210605095U CN 201921262760 U CN201921262760 U CN 201921262760U CN 210605095 U CN210605095 U CN 210605095U
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Abstract
The application provides an optical module, the light-emitting window setting of incidenting optic fibre is in near the focus of first collimation lens, and then first collimation lens carries out the collimation with the light that incidenting optic fibre afferent, exports to the filter plate after forming collimated light, then, utilizes the light of this filter plate transmission specific wavelength to reflect the light of wavelength except that above-mentioned transmission wavelength simultaneously. Because the filter has the characteristics that the light incidence angle is smaller and the performance of the separation wavelength is better, therefore, the filter utilizes the first collimating lens to collimate the light transmitted by the incident optical fiber and then enters the filter with the included angle between the optical surface and the optical axis of the filter being 70-110 degrees, so that the included angle between the collimated light incident to the filter and the optical surface of the filter is about 70-90 degrees, and further the light splitting performance of the filter can reach the approximate optimal state, so that the filter can play the role of intensive light splitting, and the separation of optical signals with the closer wavelength interval is realized.
Description
Technical Field
The application relates to the technical field of optical communication, in particular to an optical module.
Background
With the increasing demand for communication bandwidth in the field of optical fiber communication, global optical communication is in a rapid development period. In the field of high-speed data communication, due to a bottleneck of electrical transmission rate, for an optical fiber communication network with a transmission rate required to be 40/100/200/400Gbps, in order to ensure that data can be transmitted at a high speed and a long distance, an optical module is generally adopted in the prior art, such as: the optical transmission module and the optical receiving module are used for realizing the transmission and the receiving of light with different wavelengths, and the commonly adopted solution is to multiplex a plurality of paths of optical signals with different wavelengths into a single-mode optical fiber for transmission.
And the separation of the optical signals of different wavelengths in one optical fiber is realized by an optical splitting component with optical splitting capability. In the existing optical splitting assembly, a 45 ° optical filter technology is usually adopted to realize reflection and transmission of optical signals of different wave bands. Because the light beam among the present beam splitting subassembly is mostly the beam of unparallel, the beam angle that the beam of unparallel incides 45 filter plate coating film faces is in about the scope of 6. The filter characteristic of the 45 ° filter is sensitive to the incident angle, that is: the filter characteristic curve moves by 5-10 nm when the incident angle changes once, so that the wave bands of the optical signals which can be separated by the existing 45-degree optical filter are far away. However, when the wavelength band interval between the wavelength bands of the optical signals incident to the 45 ° optical filter is several nanometers to several tens of nanometers, the 45 ° optical filter cannot separate the optical signals.
Therefore, it is necessary to provide an optical module capable of separating optical signals of different wavelengths having a wavelength pitch different by several to several tens of nanometers.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides an optical module to realize separation of optical signals with relatively close wavelength intervals.
The optical module that this application embodiment provided mainly includes the optical module, its characterized in that, including optic fibre lock pin, first collimation lens, filter and light receiving element, be equipped with incident optic fibre and reflection optic fibre in the optic fibre lock pin, wherein:
the light outlet of the incident optical fiber is arranged near the first focus of the first collimating lens;
the first collimating lens is used for collimating the light transmitted by the incident optical fiber to form collimated light, outputting the collimated light to the filter, and focusing the light reflected by the filter to the reflecting optical fiber;
the included angle between the optical surface of the filter and the optical axis of the first collimating lens is 70-110 degrees, and the filter is used for transmitting light of a first wave band in the collimated light to the light receiving element and reflecting light except the first wave band in the collimated light
As can be seen from the above embodiments, in the optical module provided in this embodiment, the light outlet of the incident optical fiber is disposed near the focus of the first collimating lens, and then the first collimating lens collimates the light transmitted by the incident optical fiber to form collimated light, which is then output to the filter, and then the filter is used to transmit light with a specific wavelength and reflect light with wavelengths other than the above transmitted wavelength. Because the filter has the characteristics that the smaller the light incidence angle is, the better the performance of the separation wavelength is, therefore, the embodiment utilizes the first collimating lens to collimate the light transmitted by the incident optical fiber, and then the light is incident to the filter with the included angle between the optical surface and the optical axis of the optical surface being 70 degrees to 110 degrees, so that the included angle between the collimated light incident to the filter and the optical surface of the filter is about 70 degrees to 90 degrees, the light splitting performance of the filter can reach the approximate optimal state, the filter can play the role of dense light splitting, and further the separation of optical signals with the closer wavelength interval is realized.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic partial structural diagram of an optical module according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating the light splitting effect of the light splitting assembly of FIG. 1;
fig. 3 is a schematic diagram of a light splitting effect of a 45 ° filter provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present invention.
Fig. 1 is a schematic partial structural diagram of an optical module according to an embodiment of the present application. As shown in fig. 1, the optical module is provided with one or more optical splitting assemblies, and the optical splitting assemblies are provided with an optical fiber ferrule 1, a first collimating lens 2, a filter 3 and a light receiving element 5.
The optical fiber ferrule 1 is provided with an incident optical fiber 11 and a reflecting optical fiber 12, and light transmitted in the incident optical fiber 11 is mixed light with different wavelengths; the included angle between the optical surface of the filter 3 and the optical axis of the first collimating lens 2 is 70 to 110 °, and the surface of the filter 3 used for reflecting and transmitting light is referred to as an optical surface in this embodiment.
In this embodiment, the light outlet of the incident optical fiber 11 is disposed near the first focal point (or called object focal point) of the first collimating lens 2, wherein a specific distance between the light outlet of the incident optical fiber 11 and the focal point of the first collimating lens 2 can be set according to the degree of collimation of the collimated light emitted from the first collimating lens 2 and the size of an included angle between the light axes of the first collimating lens 2. Utilize first collimating lens 2 to carry out the collimation to the light that incident optical fiber 11 exported, and then realize the incident angle control to the light of incidenting to filter 3, as more preferred scheme, the light-emitting window of incidenting optical fiber 11 is on the focal plane of first collimating lens 2 and apart from its focus nearer position, like this, first collimating lens 2 alright with the light that incident optical fiber 11 transmitted in collimate and export to filter 3 after converting into approximate parallel light, wherein, this embodiment sets up the contained angle between this approximate parallel light and the optical axis to be 0 ~ 10, as more preferred scheme, both contained angles are 0 ~ 2, but do not include 0.
Through the design of coating film on the optical surface of the filter 3, the filter can transmit the light of the first wavelength band in the mixed light output by the incident optical fiber 11 to the light receiving element 5, and reflect the light except the first wavelength band in the mixed light, for example, the light incident to the filter 3 contains the light of 1520nm, 1550nm and 1577nm, and the filter 3 only transmits the light with the wavelength of 1550nm and reflects the light with the wavelengths of 1520nm and 1577nm, and then the reflected light enters the reflective optical fiber 12 after being focused by the first collimating lens 2, wherein, in order to reduce the loss of the reflected light, the incident optical fiber 11 and the reflective optical fiber 12 are symmetrically arranged relative to the optical axis of the first collimating lens 2 in the embodiment.
Further, in order to make the light energy transmitted by the filter 3 more incident on the light receiving element 5 at the rear end, in this embodiment, a second collimating lens 4 is further disposed between the filter 3 and the light receiving element 5, and the light transmitted by the filter 3 is focused to the light receiving element 5 by using the second collimating lens 4, wherein the light receiving element 5 may be a photodetector, a light receiving chip, or the like.
Because the filter 3 itself has the characteristic that the light incidence angle is smaller (i.e. the included angle between the incident light and the normal of the optical surface of the filter 3 is smaller), and the performance of the separation wavelength is better, therefore, the embodiment utilizes the first collimating lens 2 to collimate the light transmitted by the incident optical fiber to form collimated light, and then the collimated light enters the filter 3 with the included angle between the optical surface and the optical axis thereof being 70-110 degrees, so that the included angle between the collimated light incident to the filter 3 and the optical surface of the filter 3 is about 70-90 degrees, so that the light splitting performance of the filter can reach the approximate optimal state, the filter can play the dense light splitting role, and the separation of the optical signals with the closer wavelength interval is realized.
FIG. 2 is a schematic diagram illustrating the light splitting effect of the light splitting assembly of FIG. 1; fig. 3 is a schematic diagram of a light splitting effect of the 45 ° filter 3 according to the embodiment of the present application. As shown in fig. 2 and 3, λ is the wavelength respectively1And λ2Of two wavelengths that are closely spaced,compared with a 45-degree filter plate, the filter plate in the embodiment has larger difference of the transmittance of two kinds of wavelength light, so that the separation of optical signals with closer wavelength intervals can be better realized, and the dense light splitting effect can be realized.
The following will explain the light propagation process of the light splitting assembly of the optical module in fig. 1 by taking the first collimating lens 2 as a Grin-lens auto-focusing collimating lens as an example.
The present embodiment arranges that the light exit of the incident optical fiber 11 is arranged on the focal plane of the first collimating lens 2, and according to the matrix theory of lens imaging, when paraxial meridian propagation is considered, the paraxial condition cos θ ≈ 1, and n (γ) ═ n is used0And calculating the optical path according to the optical fiber transmission matrix, wherein the specific calculation process is as follows:
the light outlet of the incident optical fiber 11 and the optical path matrix of the first collimating lens 2 satisfy:
the optical path matrix inside the first collimating lens 2 satisfies:
the optical path matrix between the first collimating lens 2 and the optical surface of the filter 3 satisfies:
further, the total optical path matrix is:
the above L ═ f, f is the focal length of the first collimating lens 2, and satisfies:
According to the parameters between the above elements and the optical parameters of the first collimating lens 2, the light-emitting matrix emitted from the incident optical fiber 11 is:
where D/2 is the core distance between the incident fiber 11 and the reflective fiber 12, and NA is the numerical aperture of the reflective fiber 12, where a constant is given to the same type of fiber. The product of the light emitting matrix and the total light path matrix is the light path matrix from the emergent light of the incident optical fiber 11 to the filter 3.
According to the above formula, it can be calculated that, when the filter 3 is placed at the second focal point (image space focal point) of the first collimating lens 2, and the included angle between the optical surface of the filter 3 and the optical axis of the first collimating lens 2 is any one of 70 ° to 110 °, the reflected light enters the reflective optical fiber 12 symmetrical to the incident optical fiber 11 about the optical axis, and the transmitted light has a small angle and is transmitted out of the filter 3 through the second collimating lens 4 and finally converged on the light receiving element 5.
The distance L between the first collimating lens 2 and the light outlet of the incident optical fiber 11 was set to 0.012 mm. The distance L' between the optical surfaces of the first collimating lens 2 and the filter 3 is 0.012mm, the pitch P of the first collimating lens 2 is 0.249mm, the focal length f is 0.012, the included angle between the optical surface of the mm filter 3 and the optical axis of the first collimating lens 2 is 90 °, and the core distance between the incident optical fiber 11 and the reflecting optical fiber 12 is 0.0625mm, and NA is 7 °, and according to the above-mentioned optical path matrix, it can be calculated that the transmission light can be incident to the second collimating lens 4 at an off-angle of about 1.8 °.
The embodiment utilizes filtering, the reflection of filter 3, and, utilize filter 3 characteristics that the performance of separation wavelength is better under the low angle light incidence condition, through to incident optical fiber 11, reflection optical fiber 12, the position design of first collimation lens 2 and filter 3 and the angle design of placing to filter 3, this light splitting component makes the light that 11 emissions of incident optical fiber in the light path with low angle incidence to filter 3, and make specific wavelength light transmission, all the other wavelength light reflection to in the reflection optical fiber. In addition, the tolerance of the front-back distance between the elements is improved by selecting a proper collimating lens, for example, a Grin-lens self-focusing collimating lens is selected, so that the insertion loss of reflected light can be reduced, wherein the insertion loss can be less than 0.3 dB. Therefore, the light splitting module provided by the embodiment has the advantages of short light splitting interval and small light loss compared with the light splitting mode of the 45 ° filter 3. It should be noted that the first collimating lens 2 and the second collimating lens 4 in this embodiment are not limited to being a Grin-lens auto-focusing collimating lens, and may be other types of lenses, such as C-lens.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments, and the relevant points may be referred to the part of the description of the method embodiment. It is noted that other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (8)
1. An optical module, characterized by, includes optic fibre lock pin, first collimating lens, filter and light receiving element, be equipped with incident fiber and reflection optic fibre in the optic fibre lock pin, wherein:
the light outlet of the incident optical fiber is arranged near the first focus of the first collimating lens;
the first collimating lens is used for collimating the light transmitted by the incident optical fiber to form collimated light, outputting the collimated light to the filter, and focusing the light reflected by the filter to the reflecting optical fiber;
and an included angle between the optical surface of the filter and the optical axis of the first collimating lens is 70-110 degrees, and the filter is used for transmitting light of a first wave band in the collimated light to the light receiving element and reflecting light except the first wave band in the collimated light.
2. The light module of claim 1, further comprising a second collimating lens disposed along the optical axis, wherein:
the second collimating lens is used for focusing the light transmitted by the filter plate to the light receiving element.
3. The optical module of claim 1, wherein the incident optical fiber and the reflective optical fiber are symmetrically disposed with respect to an optical axis of the first collimating lens.
4. A light module as claimed in claim 3, characterized in that the filter plate is arranged in the vicinity of the second focus of the first collimating lens.
5. The optical module of claim 1, wherein an angle between the collimated light and an optical axis of the first collimating lens is 0 ° to 2 °.
6. The optical module of claim 1, wherein an angle between the optical surface of the filter and the optical axis of the first collimating lens is 80 ° to 100 °.
7. The optical module according to any one of claims 1 to 6, wherein the light exit of the incident optical fiber is disposed on a focal plane of the first collimating lens.
8. The optical module of claim 1, wherein the first collimating lens is a Grin-lens self-focusing lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921262760.4U CN210605095U (en) | 2019-08-06 | 2019-08-06 | Optical module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921262760.4U CN210605095U (en) | 2019-08-06 | 2019-08-06 | Optical module |
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| Publication Number | Publication Date |
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| CN210605095U true CN210605095U (en) | 2020-05-22 |
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| CN201921262760.4U Active CN210605095U (en) | 2019-08-06 | 2019-08-06 | Optical module |
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- 2019-08-06 CN CN201921262760.4U patent/CN210605095U/en active Active
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