Miniaturized polarization-maintaining dense wavelength division multiplexer
Through miniaturized structure design and optical component optimization, a miniaturized polarization-maintaining dense wavelength division multiplexer (DWDM) achieves low transmission coupling loss, high reflection isolation, and high return loss, solving the problems of large size and polarization preservation in existing DWDMs and making it suitable for various optical communication systems.
Patent Information
- Application Number
- CN202520461825.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-03-17
AI Technical Summary
Existing dense wavelength division multiplexers are large in size and cannot maintain polarized light, have insufficient transmission and reflection isolation, and have high return loss.
The miniaturized polarization-maintaining dense wavelength division multiplexer adopts a miniature structure design. By compressing the size of the device through optical design, and utilizing components such as dual-beam single-mode polarization-maintaining pigtails, radially graded refractive index lenses, and polarizers, it achieves low transmission coupling loss, high reflection isolation, and high return loss. It can also add slow-axis pass-through or fast-axis cut-off functions to the polarization-maintaining fiber as needed.
A miniaturized polarization-maintaining dense wavelength division multiplexer has been developed, featuring low transmission coupling loss, high reflection isolation, high return loss, and the ability to maintain polarized light state. It also has multi-functional adjustment capabilities and is suitable for fiber optic networks, DWDM networks, CATV optical systems, etc.
Smart Images
Figure CN223857439U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of optical fiber network especially to the field of dense wavelength division multiplexer, and specifically to a miniaturized polarization maintaining dense wavelength division multiplexer. BACKGROUND
[0002] The existing dense wavelength division multiplexer is large in size and has no function of maintaining polarized light. The utility model discloses a mini polarization maintaining dense wavelength division multiplexer to overcome the above-mentioned shortcomings. The mini structure design is used to compress the overall device volume. Through optical design, the transmission coupling loss is small, the transmission and reflection isolation degree is large, the echo loss is large, the linearity is strong, and the tap function can be added. The utility model has the function of maintaining polarized light. According to the customer's requirements, the polarization maintaining fiber slow axis light transmission and fast axis cutoff function or the fast axis light transmission and slow axis cutoff function can be added. The utility model can be widely used in optical fiber network, DWDM network, CATV optical system, optical fiber test, optical signal monitoring and other systems. SUMMARY
[0003] The utility model discloses a polarization maintaining dense wavelength division multiplexer which overcomes the shortcomings of the prior art and has large reverse isolation, small coupling loss and large echo loss.
[0004] To achieve the above object, the miniaturized polarization maintaining dense wavelength division multiplexer of the utility model is as follows:
[0005] The miniaturized polarization maintaining dense wavelength division multiplexer has the following main features. The wavelength division multiplexer comprises two double optical single-mode polarization maintaining pigtail fibers, a radial gradient refractive index lens, a plano-convex lens, a polarizer, a mini isolator core, two second glass tubes, a first glass tube and a filter. The end face of the double optical single-mode polarization maintaining pigtail fiber is attached to the flat end of the plano-convex lens. The double optical single-mode polarization maintaining pigtail fiber and the plano-convex lens are embedded in one of the second glass tubes. The polishing angle of the radial gradient refractive index lens is 6 degrees. One end of the radial gradient refractive index lens is attached to the end face of the other double optical single-mode polarization maintaining pigtail fiber. The other end of the radial gradient refractive index lens is attached to one end of the polarizer. The other end of the polarizer is attached to the filter. The double optical single-mode polarization maintaining pigtail fiber, the radial gradient refractive index lens, the polarizer and the filter are combined into a second double fiber collimator and embedded in the other second glass tube. The two second glass tubes are installed inside the first glass tube and located at both ends of the first glass tube. The mini isolator core is installed inside the first glass tube and located between the two second glass tubes.
[0006] Preferably, the outer diameter of the double optical single-mode polarization maintaining pigtail fiber is 1.8 mm, the polishing angle of the end face of the pigtail fiber is 6 degrees, and the pigtail fiber is coated with a corresponding antireflection film.
[0007] Preferably, one end face of the plano-convex lens is a spherical face with a radius of curvature of 1.2 mm, and is coated with a corresponding anti-reflection film layer or film layer of a film tap; the other end face of the plano-convex lens is a plane end with a polishing angle of 6 degrees, and is coated with a corresponding anti-reflection film layer.
[0008] Preferably, the radial gradient refractive index lens has an outer diameter of 1.8 mm, one end face of the radial gradient refractive index lens is a plane end with a polishing angle of 0 degrees, and is coated with a corresponding anti-reflection film layer; the other end face of the radial gradient refractive index lens is a plane end with a polishing angle of 6 degrees, and is coated with a corresponding anti-reflection film layer.
[0009] Preferably, the mini isolator core has an outer diameter of 2.35 mm and a length of 2 mm.
[0010] Preferably, the polarizing plate has a light transmission direction of 0 degrees, a length of 1.4 mm, and a thickness of 1.4 mm.
[0011] Preferably, the first glass tube has an outer diameter of 2.8 mm and a length of 17 mm.
[0012] Preferably, the second glass tube has an outer diameter of 2.15 mm, an inner diameter of 1.8 mm, and a length of 5 mm.
[0013] Preferably, the filter plate has a length of 1.4 mm and a thickness of 1.4 mm.
[0014] The miniaturized polarization maintaining dense wavelength division multiplexer adopts optical design and a mini structure design, compresses the overall device volume, and has small transmission coupling loss, large transmission and reflection isolation, and large return loss, is linear, and can add a tap function. The miniaturized polarization maintaining dense wavelength division multiplexer has the effect of maintaining polarized light, can increase a slow axis light transmission and fast axis cut-off function or a fast axis light transmission and slow axis cut-off function according to customer requirements, and can be widely used in optical fiber networks, DWDM networks, CATV optical systems, optical fiber tests, optical signal monitoring systems, and the like. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 Fig. 1 is a structural schematic view of a miniaturized polarization maintaining dense wavelength division multiplexer.
[0016] Figure 2 Fig. 4 is a schematic view of a filter plate assembly of the miniaturized polarization maintaining dense wavelength division multiplexer.
[0017] Figure 3 Fig. 5 is a schematic view of a mini isolator core of the miniaturized polarization maintaining dense wavelength division multiplexer.
[0018] Figure 4The utility model discloses a miniaturized polarization maintaining dense wavelength division multiplexer collimator assembly schematic view.
[0019] Reference signs:
[0020] 1 dual light single mode polarization maintaining pigtail
[0021] 2 radial gradient refractive index lens
[0022] 3 mini isolator core piece
[0023] 4 polarizer
[0024] 5 first glass tube
[0025] 6 second glass tube
[0026] 7 plano-convex lens
[0027] 8 filter sheet Specific embodiment
[0028] In order to more clearly describe the technical content of the utility model, the following further description is made in combination with specific embodiments.
[0029] The utility model discloses a miniaturized polarization maintaining dense wavelength division multiplexer, wherein it includes two dual light single mode polarization maintaining pigtail 1, a radial gradient refractive index lens 2, a plano-convex lens 7, a polarizer 4, a mini isolator core piece 3, two second glass tubes 6, a first glass tube 5 and a filter sheet 8, the tail fiber end surface of the dual light single mode polarization maintaining pigtail 1 is attached to the plane end of the plano-convex lens 7, the dual light single mode polarization maintaining pigtail 1 and the plano-convex lens 7 are the first dual fiber collimator, and are nested in one second glass tube 6, one end of the radial gradient refractive index lens 2 with a polishing angle of 6 degrees is attached to the tail fiber end surface of the other dual light single mode polarization maintaining pigtail 1, the other end of the radial gradient refractive index lens 2 is attached to one end of the polarizer 4, the other end of the polarizer 4 is attached to the filter sheet 8, the dual light single mode polarization maintaining pigtail 1, the radial gradient refractive index lens 2, the polarizer 4 and the filter sheet 8 are combined into the second dual fiber collimator, and are nested in the other second glass tube 6, the two second glass tubes 6 are installed inside the first glass tube 5 and are located at both ends of the first glass tube 5, and the mini isolator core piece 3 is installed inside the first glass tube 5 and is located between the two second glass tubes 6.
[0030] As a preferred embodiment of the utility model, the outer diameter of the dual light single mode polarization maintaining pigtail 1 is 1.8mm, the polishing angle of the tail fiber end surface is 6 degrees, and a corresponding antireflection film layer is plated.
[0031] As the preferred embodiment of the utility model, one end face of the plano-convex lens 7 is spherical, the radius of curvature is 1.2mm, is plated with corresponding antireflection film layer or film layer, the other end face of the plano-convex lens 7 is plane end, the polishing angle is 6 degrees, and the film is plated with corresponding antireflection film layer.
[0032] As the preferred embodiment of the utility model, the outer diameter of the radial gradient refractive index lens 2 is 1.8mm, one end face of the radial gradient refractive index lens 2 is plane, the polishing angle is 0 degree, is plated with corresponding antireflection film layer, the other end face of the radial gradient refractive index lens 2 is plane end, the polishing angle is 6 degrees, and the film is plated with corresponding antireflection film layer.
[0033] As the preferred embodiment of the utility model, the outer diameter of the mini isolator core 3 is 2.35mm, and the length is 2mm.
[0034] As the preferred embodiment of the utility model, the light transmission direction of the polarizer 4 is 0 degree angle, the length is 1.4mm, and the thickness is 1.4mm.
[0035] As the preferred embodiment of the utility model, the outer diameter of the first glass tube 5 is 2.8mm, and the length is 17mm.
[0036] As the preferred embodiment of the utility model, the outer diameter of the second glass tube 6 is 2.15mm, the inner diameter is 1.8mm, and the length is 5mm.
[0037] As the preferred embodiment of the utility model, the length of the filter 8 is 1.4mm, and the thickness is 1.4mm.
[0038] In the specific embodiment of the utility model, a kind of mini polarization maintaining fiber dense wavelength division multiplexer is disclosed, and its structural diagram is as shown in Figure 1 Mainly including two double light single mode polarization maintaining tail fiber 1, a radial gradient refractive index lens 2, a plano-convex lens 7, a polarizer 4, a mini isolator core 3, two second glass tubes 6, a first glass tube 5, a filter 8.
[0039] The utility model includes two outer diameters OD1.8mm double light single mode polarization maintaining tail fiber 1, and tail fiber end face polishing angle is 6 degrees and needs to be plated with corresponding antireflection film layer.
[0040] A radial gradient refractive index lens 2, a plano-convex lens 7, a polarizer 4, a mini isolator core 3, two second glass tubes 6, a first glass tube 5, a filter 8.
[0041] One grain outer diameter OD1.8mm Glens radial gradient index lens 2;Wherein one end face is a plane, the polishing angle is 0 degrees, and a corresponding antireflection film layer is coated, and the other end plane polishing angle is 6 degrees, and a corresponding antireflection film layer also needs to be coated.The intercept size is 0.249P.
[0042] Two second glass tubes 6, namely OD2.15xID1.8xL5mm glass tubes, are sleeved on the double optical single-mode polarization maintaining tail fiber 1.
[0043] One mini isolator core 3, the size is OD2.35xL2mm.
[0044] One polaroid 4, the light transmission direction is 0 degrees, and the size is L1.4xW1.4mm.
[0045] One filter 8, the size is L1.4xW1.4mm.
[0046] One first glass tube 5, namely OD2.8xL17mm glass tube.
[0047] The polaroid 4 is attached to the 0-degree-angle end face of the GLENS lens, so that the 0-degree-angle light transmission direction of the polaroid 4 can be conveniently selected and adjusted.
[0048] The outer sealing size of the mini polarization maintaining fiber dense wavelength division multiplexer can be as small as 2.8mm in outer diameter and 17mm in length.
[0049] The following is one specific embodiment of the utility model, which is a 2x2 100G dense wavelength division multiplexer:
[0050]
[0051]
[0052] The utility model has the advantages of small size, cost saving, high extinction ratio, small volume, large reverse isolation, small coupling loss, large return loss, and wide application in the fields of optical communication, CATV, optical amplifier and the like.
[0053] The specific implementation scheme of the embodiment can be referred to the related description in the above embodiment, which will not be repeated here.
[0054] It can be understood that the same or similar parts in the above-mentioned embodiments can be mutually referenced, and the content not described in detail in some embodiments can refer to the same or similar content in other embodiments.
[0055] It should be noted that in the description of the utility model, the terms "first", "second" and the like are used only for the purpose of description and can not be understood as indicating or implying relative importance. In addition, in the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is at least two.
[0056] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0057] The miniaturized polarization maintaining dense wavelength division multiplexer adopting the utility model, through optical design, uses mini structure design, compresses the overall device volume, and through optical design, makes the transmission coupling loss small, the transmission and reflection isolation degree large, the echo loss large, the linearity strong, and can add tap function. And has the effect of maintaining polarized light, can increase the slow axis light transmission of polarization maintaining fiber or the fast axis cut-off function or the fast axis light transmission, slow axis cut-off function according to customer's requirement. It can be widely used in fiber network, DWDM network, CATV optical system, fiber test, optical signal monitoring and other systems.
[0058] In this specification, the utility model has been described with reference to its specific embodiments. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the utility model. Therefore, the specification and drawings should be considered as illustrative rather than restrictive.
Claims
1. A compact polarization maintaining dense wavelength division multiplexer, characterized by, The wavelength division multiplexer comprises two double optical single mode polarization maintaining pigtail fibers, a radial gradient index lens, a plano-convex lens, a polarizer, a mini isolator core, two second glass tubes, a first glass tube and a filter, one end of the plano-convex lens is attached to the end face of one of the double optical single mode polarization maintaining pigtail fibers, the double optical single mode polarization maintaining pigtail fiber and the plano-convex lens form a first double fiber collimator and are nested in one of the second glass tubes, one end of the radial gradient index lens is attached to the end face of the other double optical single mode polarization maintaining pigtail fiber, the other end of the radial gradient index lens is attached to one end of the polarizer, the other end of the polarizer is attached to the filter, the double optical single mode polarization maintaining pigtail fiber, the radial gradient index lens, the polarizer and the filter form a second double fiber collimator and are nested in the other second glass tube, the two second glass tubes are installed inside the first glass tube and are located at both ends of the first glass tube, and the mini isolator core is installed inside the first glass tube and is located between the two second glass tubes.
2. The compact polarization maintaining dense wavelength division multiplexer according to claim 1, wherein, The outer diameter of the double optical single mode polarization maintaining pigtail fiber is 1.8 mm, the polishing angle of the end face of the pigtail fiber is 6 degrees, and the pigtail fiber is coated with a corresponding anti-reflection film layer.
3. The compact polarization maintaining dense wavelength division multiplexer of claim 1, wherein, One end face of the plano-convex lens is a spherical surface with a radius of 1.2 mm, and is coated with a corresponding anti-reflection film layer or a film layer, the other end face of the plano-convex lens is a flat end with a polishing angle of 6 degrees and is coated with a corresponding anti-reflection film layer.
4. The compact polarization maintaining dense wavelength division multiplexer of claim 1, wherein, The outer diameter of the radial gradient index lens is 1.8 mm, one end face of the radial gradient index lens is a flat end with a polishing angle of 0 degrees and is coated with a corresponding anti-reflection film layer, the other end face of the radial gradient index lens is a flat end with a polishing angle of 6 degrees and is coated with a corresponding anti-reflection film layer.
5. The compact polarization maintaining dense wavelength division multiplexer of claim 1, wherein, The outer diameter of the mini isolator core is 2.35 mm, and the length is 2 mm.
6. The compact polarization maintaining dense wavelength division multiplexer of claim 1, wherein, The polarizer has a light transmission direction of 0 degrees, a length of 1.4 mm and a thickness of 1.4 mm.
7. The compact polarization maintaining dense wavelength division multiplexer of claim 1, wherein, The outer diameter of the first glass tube is 2.8 mm, and the length is 17 mm.
8. The compact polarization maintaining dense wavelength division multiplexer of claim 1, wherein, The outer diameter of the second glass tube is 2.15 mm, the inner diameter is 1.8 mm, and the length is 5 mm.
9. The compact polarization maintaining dense wavelength division multiplexer of claim 1, wherein, The filter has a length of 1.4 mm and a thickness of 1.4 mm.