Eight-channel wavelength division demultiplexing optical device
By using filters and mirrors in the first wave division component of the eight-channel optical device, the problems of high coating costs and poor return losses in traditional technology are solved, and lower cost and higher performance optical devices are achieved.
Patent Information
- Application Number
- CN202421212116.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-30
AI Technical Summary
In traditional eight-channel optical devices, the first wave segment component uses a right-angle prism, resulting in high coating costs and poor return losses.
By using a filter and a mirror in the first wave division assembly, and the incident angle of the filter is less than 45°, the wave division function is realized, reducing coating costs and optimizing return loss.
The coating cost of the first wave segment component is reduced, the return loss is optimized, and the overall performance of the optical device is improved.
Smart Images
Figure CN222439715U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical communication, in particular to an eight-channel wavelength division and multiplexing optical device. Background Art
[0002] Optical modules are devices that realize the mutual conversion of photoelectric signals and are important equipment in the field of optical communications. Multi-channel optical modules can realize the reception and transmission of multiple optical signals and improve the transmission rate, so they are widely used. For example, four-channel optical devices and eight-channel optical devices are multi-channel optical devices with more applications. Since the technology of four-channel wavelength division components is mature, eight-channel optical devices generally contain two groups of wavelength division components, and they are distributed front and back in the optical path. Taking the received optical signal as an example, the optical signal received by the optical fiber is first transmitted to the first wavelength division component, and the first wavelength division component splits the received group of composite optical signals into two groups of composite light. The two groups of composite light are then incident on the two parts of the second wavelength division component (each part is similar to the four-channel wavelength division component), and split into eight single optical signals by the second wavelength division component. In traditional eight-channel optical devices, in order to facilitate installation, the first wavelength division component generally uses a right-angle prism. The received optical signal is incident on the right-angle prism at 45° and then output at 45°. However, although this method is easy to install, it is difficult to coat the right-angle prism, which will lead to high coating costs, and the reflection of parallel light at 45° is also prone to poor return loss. Utility Model Content
[0003] The utility model aims to provide an eight-channel wavelength division multiplexing optical device, which reduces the cost of the first wavelength division component by changing the structure of the first wavelength division component, thereby reducing the overall cost of the optical device.
[0004] In order to achieve the above-mentioned utility model object, the utility model embodiment provides the following technical solutions:
[0005] An eight-channel wavelength division and multiplexing optical device comprises a first wavelength division component and a second wavelength division component. The first wavelength division component comprises a filter and a reflector, and the position relationship of the filter satisfies that the angle at which the optical signal is incident on the filter is less than 45 degrees.
[0006] More preferably, the angle at which the light signal is incident on the filter is 8° to 40°.
[0007] In the above scheme, the incident light is incident on the filter at an angle less than 45°. The first wave splitting component can achieve wave splitting through the combination of the filter and the reflector. Especially when the incident light is 8° to 40°, the filter coating layer can be less, the filter yield will be improved, and the probability of subsequent filter deformation is lower, so the difficulty of filter coating can be greatly reduced, and then the coating cost of the first wave splitting component can be reduced. Moreover, the input at a small angle avoids the incident light from being incident vertically on the optical surface, thereby reducing the proportion of interface reflected light returning to the optical fiber, and then optimizing the return loss, and then improving the performance.
[0008] In the optimized solution, the second wavelength division component includes a mutually independent wavelength division component 1 and a wavelength division component 2. In this solution, the second wavelength division component is composed of two independent wavelength division components, the spacing between the two components is adjustable, which is more compatible with subsequent PD array and TIA design, reduces design difficulty and reduces overall size.
[0009] In one feasible solution, the filter and the reflector are both one, and the received composite optical signal is divided into two groups after being incident on the filter, one group is incident on the wavelength division element one through the filter, and the other group is reflected by the filter to the reflector, and then reflected by the reflector to the wavelength division element two.
[0010] In another feasible solution, there is one filter, and the reflectors include reflector 1, reflector 2, and reflector 3. The received composite optical signal is incident on reflector 1, and is reflected by reflector 1 to the filter and is divided into two groups. One group is incident on reflector 2 through the filter and is reflected by reflector 2 to wavelength division element 2, and the other group is reflected by the filter to reflector 3 and is reflected by reflector 3 to wavelength division element 1.
[0011] The above two implementation schemes are both relatively simple and easy to implement, and the first one is particularly preferred because it can reduce the number of reflectors used, thereby lowering the cost.
[0012] The collimator is also included, and the received composite optical signal is collimated by the collimator and then incident on the first wavelength subassembly. In this solution, by setting the collimator, the dispersed multiple wavelength optical signals can be collimated and then incident on the first wavelength subassembly, thereby reducing the optical signal loss and improving the optical signal transmission quality.
[0013] The optical path alignment is more reliable by providing a supporting platform, wherein the first wave subassembly and the second wave subassembly are both arranged on the supporting platform.
[0014] In a further optimized solution, the carrying platform is provided with an arc groove or a V-shaped groove, and the collimator is installed in the arc groove or the V-shaped groove. The arc groove or the V-shaped groove can enhance the bonding strength and alignment accuracy of the collimator.
[0015] A further optimized solution further includes a focusing component, the focusing component includes a focusing lens and a prism, and the focusing lens is arranged on the light incident surface or the light exit surface of the prism. In this solution, the optical signals of each wavelength after the demultiplexing are focused by the focusing component and then processed, thereby improving the optical signal analysis effect.
[0016] The wavelength division element 1 and the wavelength division element 2 each include a prism for folding back light and four filters.
[0017] Compared with the prior art, the utility model has the following technical advantages:
[0018] The filter is combined with a reflector to achieve the first wavelength division, and the incident light is at a small angle to optimize the return loss and reduce the cost. The second wavelength division component is composed of two wavelength division elements with adjustable spacing, which can be better compatible with subsequent PD array and TIA designs. The carrier platform can compensate for the height difference between different functional components, and the addition of V-grooves at the collimator can enhance the alignment accuracy and bonding strength. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work, but they all fall within the scope of protection of the utility model.
[0020] Figure 1a , Figure 1b , Figure 1c , Figure 1d , Figure 1e They are respectively a structural diagram, a front view, a top view, a bottom view, and a schematic diagram of an optical path of the eight-channel wavelength division and multiplexing optical device in Example 1.
[0021] Figure 2a , Figure 2b , Figure 2c , Figure 2d , Figure 2e They are respectively a structural diagram, a front view, a top view, a bottom view, and a schematic diagram of an optical path of an eight-channel wavelength division multiplexing optical device in Example 2.
[0022] Figure 3 It is a principle block diagram of an eight-channel wavelength division multiplexing optical device in an embodiment.
[0023] Figure 4 It is the main view of the carrying platform in the embodiment.
[0024] Markings in the figure: collimator 10; filter 12; reflector 11; reflector one 13; reflector two 14; reflector three 15; wavelength division element one 16; wavelength division element two 17; focusing assembly 18; carrying platform 19. DETAILED DESCRIPTION
[0025] The technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the utility model.
[0026] Example 1
[0027] See also Figure 1a , Figure 1b , Figure 1c , Figure 1d , Figure 1e , Figure 3 The eight-channel wavelength division multiplexing optical device provided in this embodiment includes a collimator 10, a first wavelength division component, a second wavelength division component and a focusing component 18. The second wavelength division component includes a wavelength division element 16 and a wavelength division element 17, and the wavelength division element 16 and the wavelength division element 17 are arranged separately from each other.
[0028] Taking the receiving optical path as an example, please refer to Figure 3 The received divergent composite optical signal (λ1-λ8) is collimated by the collimator 10 and then input into the first wavelength division component, and is divided into two groups of composite optical signals by the first wavelength division component, one of which (λ1-λ4) is incident on the wavelength division element 16, and is dispersed into four single-wavelength signals by the wavelength division element 16, and the four single-wavelength signals are then focused by the focusing component 18 to form focused deflected light; the other group of composite optical signals (λ5-λ8) is incident on the wavelength division element 2 17, and is dispersed into four single-wavelength signals by the wavelength division element 2 17, and the four single-wavelength signals are then focused by the focusing component 18. The wavelength division element 1 16 and the wavelength division element 2 17 have the same structure, both of which include a prism for refracting light and four filters. After the composite optical signal (λ1-λ4 or λ5-λ8) is refracted multiple times by the prism, each wavelength optical signal is separated out through a corresponding filter.
[0029] The focusing assembly 18 includes a focusing lens and a prism. The focusing lens can be arranged on the light incident surface of the prism or on the light emitting surface of the prism.
[0030] See also Figure 1a , Figure 1c The first wave splitter assembly includes a filter 12 and a reflector 11, and the position relationship of the filter 12 satisfies that the angle at which the light signal is incident on the filter 12 is 37°.
[0031] See also Figure 1e The received composite optical signal is incident on the filter 12 and is divided into two groups. One group is incident on the wavelength division element 16 through the filter, and the other group is reflected by the filter 12 to the reflector 11 and then reflected by the reflector 11 to the wavelength division element 2 17.
[0032] See also Figure 1b and Figure 4 The eight-channel wavelength division multiplexing optical device may further include a carrier platform 19, on which the first wavelength division component, the second wavelength division component, the collimator 10, and the focusing component 18 are arranged, and the first wavelength division component, the second wavelength division component, the collimator 10, and the focusing component 18 are installed and fixed by the carrier platform 19. Figure 4 As shown, since the heights of the various components are different, the height differences between them can be compensated by using the carrying platform 19 to ensure the stability and reliability of the optical path alignment.
[0033] See also Figure 1a , Figure 1c An arc groove or a V-shaped groove (not shown) may also be provided on the carrying platform, and the collimator 10 is installed in the arc groove or the V-shaped groove. The arc groove or the V-shaped groove may enhance the bonding strength of the collimator 10 and enhance the alignment accuracy.
[0034] Example 2
[0035] See also Figure 2a , Figure 2b , Figure 2c , Figure 2d , Figure 2e The eight-channel wavelength division multiplexing optical device provided in this embodiment is different from that in Embodiment 1 in that the structure of the first wavelength division multiplexing component in this embodiment is different.
[0036] In this embodiment, the first wave splitter assembly includes a filter 12 and a reflector 13, a reflector 2 14, and a reflector 3 15, and the position relationship of the filter 12 satisfies that the angle at which the light signal is incident on the filter 12 is 25°.
[0037] See also Figure 2eThe received composite optical signal is incident on the reflector 1 13, and is reflected by the reflector 1 13 to the filter 12 and then divided into two groups. One group is incident on the reflector 2 14 through the filter, and is reflected by the reflector 2 14 to the wavelength division element 2 17. The other group is reflected by the filter 12 to the reflector 3 15, and is reflected by the reflector 3 15 to the wavelength division element 1 16.
[0038] It should be noted that in the structures listed in the above two embodiments, the incident angle of the optical signal of the filter 12 in the first wavelength division component is 25° or 37°. In fact, an angle less than 45° is allowed, and 8° to 40° is particularly preferred, because it is easier to implement within this angle range and the coating cost of the filter is lower.
[0039] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention.
Claims
1. An eight-channel wavelength division multiplexing optical device, comprising a first wavelength division component and a second wavelength division component, characterized in that: The first wave splitter assembly includes a filter and a reflector, and the positional relationship of the filter satisfies that: the angle at which the light signal is incident on the filter is less than 45°.
2. The eight-channel wavelength division multiplexing optical device according to claim 1, characterized in that: The angle at which the light signal is incident on the filter is 8° to 40°.
3. The eight-channel wavelength division multiplexing optical device according to claim 1, characterized in that: The second wavelength division component includes a wavelength division element 1 and a wavelength division element 2 which are independent of each other.
4. The eight-channel wavelength division multiplexing optical device according to claim 3, characterized in that: The filter and the reflector are both one, and the received composite optical signal is divided into two groups after being incident on the filter. One group is incident on the wavelength division element one through the filter, and the other group is reflected by the filter to the reflector and then reflected by the reflector to the wavelength division element two.
5. The eight-channel wavelength division multiplexing optical device according to claim 3, characterized in that: There is one filter, and the reflector includes reflector 1, reflector 2, and reflector 3. The received composite optical signal is incident on reflector 1, and is reflected by reflector 1 to the filter and is divided into two groups. One group is incident on reflector 2 through the filter and is reflected by reflector 2 to wavelength division element 2, and the other group is reflected by the filter to reflector 3 and is reflected by reflector 3 to wavelength division element 1.
6. The eight-channel wavelength division multiplexing optical device according to claim 1, characterized in that: It also includes a collimator, and the received composite optical signal is collimated by the collimator and then incident on the first wave splitting component.
7. The eight-channel wavelength division multiplexing optical device according to claim 6, characterized in that: It also includes a carrying platform, on which the first wave subassembly and the second wave subassembly are both arranged.
8. The eight-channel wavelength division multiplexing optical device according to claim 7, characterized in that: The carrying platform is provided with an arc groove or a V-shaped groove, and the collimator is installed on the arc groove or the V-shaped groove.
9. The eight-channel wavelength division multiplexing optical device according to claim 1, characterized in that: It also includes a focusing component, which includes a focusing lens and a prism. The focusing lens is arranged on the light incident surface or the light exit surface of the prism.
10. The eight-channel wavelength division multiplexing optical device according to claim 3, characterized in that: The wavelength division element 1 and the wavelength division element 2 each include a prism for folding back light and four filters.