Miniaturized 1×1 port ultra-narrowband bandpass filter device
By using a small single fiber collimator that accurately controls the incident angle in the bandpass filter, the problems of large filter size and strict investigation angle requirements in the prior art are solved, and a miniaturized, high coaxiality and strong linear ultra-narrow bandpass filter device is realized.
Patent Information
- Application Number
- CN202421624412.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The existing bandpass filters have a large size, and the narrow bandbandpass filters have strict requirements on the incident angle, which leads to increased production difficulty.
A small single fiber collimator with precise control of the incident angle is adopted. Through the combination of single fiber pigtails, radial gradient self-focusing lenses and glass tubes, the incident angle is below 1 degree and avoid waveform distortion or etalon effects.
It has achieved a miniaturized and compact 1×1 port ultra-narrow bandpass filter device, which has high coaxiality, strong linearity and accurate packaging, and is suitable for fiber optic communication field.
Smart Images
Figure CN222734301U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of filters, in particular to the field of ultra-narrowband bandpass filters, and specifically refers to a miniaturized 1×1 port ultra-narrowband bandpass filter device. Background Art
[0002] At present, the appearance package size of the bandpass filter is OD5.5×34mm, the device size is relatively large, and the narrower the filter bandwidth, the more obvious the requirement for the light incident angle, which causes certain difficulties in production; the utility model is a miniaturized 1×1 port ultra-narrowband BPF (ultra-narrowband bandpass filter) device and its production and debugging system to overcome the above problems, by changing the double-optical pigtail production method of the traditional passive wavelength division multiplexer (the minimum spacing size of the double-optical pigtail is C125um, and the corresponding incident angle is about 1.8 degrees, which is obviously not suitable for wavelength division multiplexers that are sensitive to the incident angle, such as narrowband bandpass filters, etc.), using a single fiber collimator that can control the deflection angle within a very small range of less than 1 degree to accurately control the incident angle, so that when it is incident on the narrowband bandpass filter, it will not cause the incident angle to be too large to distort the waveform of the narrowband bandpass filter, or too small to adjust the waveform to the optimal position and cause obvious standard tool effect. Utility Model Content
[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a miniaturized 1×1 port ultra-narrow bandpass filter device that meets the requirements of high coaxiality, compact size and precise packaging.
[0004] In order to achieve the above-mentioned purpose, the miniaturized 1×1 port ultra-narrowband bandpass filter device of the utility model is as follows:
[0005] The miniaturized 1×1 port ultra-narrowband bandpass filter device has the following main features: one end of the device is a first single fiber collimator, and the other end is a second single fiber collimator and an ultra-narrowband bandpass filter assembly; the first single fiber collimator comprises a single fiber pigtail, a first radial gradient self-focusing lens and a first glass tube; one end of the single fiber pigtail is a polished surface, the polished surface of the single fiber pigtail is connected to the first radial gradient self-focusing lens, and the single fiber pigtail and the first radial gradient self-focusing lens are fixed in the first glass tube.
[0006] The second single fiber collimator and ultra-narrow bandpass filter assembly comprises a single fiber pigtail, a second radial gradient self-focusing lens, a small platform processed on the 8-degree polished surface of the second radial gradient self-focusing lens, a first glass tube, and an ultra-narrow bandpass filter. One side of the second radial gradient self-focusing lens is a plane, and the other side has an 8-degree polished surface and is coated with a corresponding anti-reflection film layer. The 8-degree polished surface of the second radial gradient self-focusing lens is connected to the polished surface of the single fiber pigtail. The single fiber pigtail and the second radial gradient self-focusing lens are fixed in the first glass tube. The small platform is processed on the 8-degree polished surface of the second radial gradient self-focusing lens, and the ultra-narrow bandpass filter is installed on the second radial gradient self-focusing lens.
[0007] The device also includes a second glass tube, and the first single fiber collimator, the second single fiber collimator and the ultra-narrow band pass filter assembly are fixed inside the second glass tube.
[0008] Preferably, the end face of the single optical fiber pigtail has a polishing angle of 8.5 degrees and is coated with a corresponding anti-reflection film layer.
[0009] Preferably, the second glass tube is used to assemble and cure the first single fiber collimator, the second single fiber collimator and the ultra-narrow bandpass filter assembly by ultraviolet glue.
[0010] Preferably, the single fiber collimator and ultra-narrow bandpass filter assembly further comprises a gasket installed between the second radial gradient self-focusing lens and the ultra-narrow bandpass filter.
[0011] Preferably, the diameter of the single optical fiber pigtail is 1.8mm; the diameter of the first radial gradient self-focusing lens is 1.8mm, the focusing constant is 0.33@1550nm, the central refractive index is 1.590@1550nm, and the circumference is 0.23; the outer diameter of the first glass tube is 2.0nm, and the length is 6mm; the diameter of the second radial gradient self-focusing lens is 1.8nm, the focusing constant is 0.33@1550nm, the central refractive index is 1.590@1550nm, and different circumferences are selected according to different incident angles; the length of the small platform is 0.35mm; the outer diameter of the second glass tube is 2.7nm, and the length is 16mm.
[0012] Preferably, the diameter of the single optical fiber pigtail is 1.0nm; the diameter of the first radial gradient self-focusing lens is 1.0nm, the focusing constant is 0.60@1550nm, the central refractive index is 1.590@1550nm, and the circumference is 0.23; the outer diameter of the first glass tube is 1.2nm, and the length is 5mm; the diameter of the second radial gradient self-focusing lens is 1.0nm, the focusing constant is 0.60@1550nm, the central refractive index is 1.590@1550nm, and different circumferences are selected according to different incident angles; the length of the small platform is 0.25mm; the outer diameter of the second glass tube is 2nm, and the length is 15mm.
[0013] The utility model adopts the miniaturized 1×1 port ultra-narrowband bandpass filter device, and uses a single fiber collimator that can control the deflection angle within a very small range of less than 1 degree to accurately control the incident angle, so that when it is incident on the narrowband bandpass filter, it will not cause the incident angle to be too large to distort the waveform of the narrowband bandpass filter, or too small to adjust the waveform to the optimal position and cause obvious etalon effect. It has high coaxiality, strong linearity, compact size, and precise packaging, and can be widely used in the field of optical fiber communication. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic structural diagram of a miniaturized 1×1 port ultra-narrowband bandpass filter device of the utility model.
[0015] Figure 2a It is a schematic structural diagram of an embodiment of scheme 1 of a single fiber collimator of a miniaturized 1×1 port ultra-narrowband bandpass filter device of the utility model.
[0016] Figure 2b It is a schematic structural diagram of an embodiment of scheme 2 of a single fiber collimator of a miniaturized 1×1 port ultra-narrowband bandpass filter device of the utility model.
[0017] Figure 3a It is a structural schematic diagram of an embodiment of scheme 1 of a single fiber collimator and an ultra-narrow band-pass filter assembly of a miniaturized 1×1 port ultra-narrow band-pass filter device of the utility model.
[0018] Figure 3b It is a structural schematic diagram of an embodiment of scheme 2 of a single fiber collimator and an ultra-narrow bandpass filter assembly of a miniaturized 1×1 port ultra-narrow bandpass filter device of the utility model.
[0019] Reference numerals:
[0020] 1 Single fiber pigtail
[0021] 2. The first radial gradient self-focusing lens
[0022] 3. The first glass tube
[0023] 4 Second radial gradient self-focusing lens
[0024] 5 Ultra-narrow bandpass filters
[0025] 6 Second glass tube
[0026] 13 Gasket
[0027] 15 Small Platform
[0028] 101 pitch 0.23 Radial gradient self-focusing lens
[0029] 102 pitch 0.23 Radial gradient self-focusing lens
[0030] 103 Special Pitch Radial Gradient Self-focusing Lens
[0031] 104 Special Pitch Radial Gradient Self-focusing Lens DETAILED DESCRIPTION
[0032] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.
[0033] The utility model discloses a miniaturized 1×1 port ultra-narrowband bandpass filter device. One end of the device is a first single fiber collimator, and the other end is a second single fiber collimator and an ultra-narrowband bandpass filter assembly. The first single fiber collimator comprises a single fiber pigtail, a first radial gradient self-focusing lens and a first glass tube. One end of the single fiber pigtail is a polished surface, and the polished surface of the single fiber pigtail is connected to the first radial gradient self-focusing lens. The single fiber pigtail and the first radial gradient self-focusing lens are fixed in the first glass tube.
[0034] The second single fiber collimator and ultra-narrow band pass filter assembly comprises a single fiber pigtail, a second radial gradient self-focusing lens, a small platform processed on the 8-degree polished surface of the second radial gradient self-focusing lens, a first glass tube, and an ultra-narrow band pass filter. One side of the second radial gradient self-focusing lens is a plane, and the other side has an 8-degree polished surface and is coated with a corresponding anti-reflection film layer. The 8-degree polished surface of the second radial gradient self-focusing lens is connected to the polished surface of the single fiber pigtail. The single fiber pigtail of the second single fiber collimator and ultra-narrow band pass filter assembly and the second radial gradient self-focusing lens are fixed in the first glass tube. The small platform is processed on the 8-degree polished surface of the second radial gradient self-focusing lens, and the ultra-narrow band pass filter is installed on the second radial gradient self-focusing lens.
[0035] The device also includes a second glass tube, and the first single fiber collimator, the second single fiber collimator and the ultra-narrow band pass filter assembly are all installed inside the second glass tube.
[0036] As a preferred embodiment of the present utility model, the end face of the single optical fiber pigtail has a polishing angle of 8.5 degrees and is coated with a corresponding anti-reflection film layer.
[0037] As a preferred embodiment of the utility model, the second glass tube is used to assemble and cure the first single fiber collimator, the second single fiber collimator and the ultra-narrow bandpass filter assembly by ultraviolet glue.
[0038] As a preferred embodiment of the utility model, the single fiber collimator and ultra-narrow bandpass filter assembly further includes a gasket installed between the second radial gradient self-focusing lens and the ultra-narrow bandpass filter.
[0039] As a preferred embodiment of the utility model, the diameter of the single optical fiber pigtail is 1.8mm; the diameter of the first radial gradient self-focusing lens is 1.8mm, the focusing constant is 0.33@1550nm, the central refractive index is 1.590@1550nm, and the circumference is 0.23; the outer diameter of the first glass tube is 2.0nm, and the length is 6mm; the diameter of the second radial gradient self-focusing lens is 1.8nm, the focusing constant is 0.33@1550nm, the central refractive index is 1.590@1550nm, and different circumferences are selected according to different incident angles; the length of the small platform is 0.35mm; the outer diameter of the second glass tube is 2.7nm, and the length is 16mm.
[0040] As a preferred embodiment of the utility model, there can also be a mini scheme with a small size. The mini scheme is that the diameter of the single optical fiber pigtail is 1.0nm; the diameter of the first radial gradient self-focusing lens is 1.0nm, the focusing constant is 0.60@1550nm, the central refractive index is 1.590@1550nm, and the circumference is 0.23; the outer diameter of the first glass tube is 1.2nm, and the length is 5mm; the diameter of the second radial gradient self-focusing lens is 1.0nm, the focusing constant is 0.60@1550nm, the central refractive index is 1.590@1550nm, and different circumferences are selected according to different incident angles; the length of the small platform is 0.25mm; the outer diameter of the second glass tube is 2nm, and the length is 15mm.
[0041] In a specific embodiment of the utility model, a miniaturized 1×1 port ultra-narrowband BPF (ultra-narrowband bandpass filter) device is involved. In order to meet the strict requirements of modern high-end equipment for filters, the filter using this structure has very narrow bandwidth, high isolation and excellent optical performance. The two-port fiber ultra-narrowband BPF (ultra-narrowband bandpass filter) device can be used in optical path systems and DWDM fiber systems that require compressed space. It can be widely used in optical network systems, multi-channel optical signal monitoring, optical switching connection systems, optical fiber debugging and measurement systems and other fields.
[0042] The technical problem to be solved by the utility model is to overcome the shortcomings and deficiencies of the prior art and provide a miniaturized 1×1 port ultra-narrowband BPF (ultra-narrowband bandpass filter) device; one end is a first single fiber collimator, and the other end is: a second single fiber collimator plus an ultra-narrowband bandpass filter, such as Figure 1 .
[0043] The technical solution adopted by the utility model is:
[0044] One end is a first single fiber collimator, which includes: a The single optical fiber pigtail 1 has an end face polished at an angle of 8.5 degrees and is coated with a corresponding anti-reflection film layer, as shown in FIG2 .
[0045] The first single fiber collimator of Scheme 1 also includes a The radial gradient self-focusing lens Glens2 has a focusing constant of 0.33@1550nm, a central refractive index of 1.590@1550nm, and a circumferential pitch of 0.23, as shown in FIG2 .
[0046] The single fiber collimator of solution 1 also includes an outer diameter × 6mm long glass tube 3, as shown in FIG2 .
[0047] The other end is a second single fiber collimator plus an ultra-narrow bandpass filter, which includes: a The single optical fiber pigtail 1 has an end face polished at an angle of 8.5 degrees and is coated with a corresponding anti-reflection film layer, as shown in FIG3 .
[0048] The second single fiber collimator plus ultra-narrow bandpass filter at the other end also includes a The radial gradient self-focusing lens Glens4 has a focusing constant of 0.33@1550nm and a central refractive index of 1.590@1550nm. Its pitch varies according to the different incident angle requirements. For the incident angle range required by different ultra-narrow bandpass filters, select the radial gradient self-focusing lens with the corresponding pitch. For an incident angle of 0 to 0.3 degrees, use 0.24 to 0.25 pitches; for an incident angle of 0.3 to 0.6 degrees, use 0.23 to 0.24 pitches; for an incident angle of 0.6 to 0.9 degrees, use 0.22 to 0.23 pitches; for an incident angle of 0.9 to 1.2 degrees, use 0.21 to 0.22 pitches.
[0049] The radial gradient self-focusing lens Glens4 has a flat surface on one side and an 8-degree polished and anti-reflective coating on the other side, and has a 0.35 mm long small platform, as shown in FIG3 .
[0050] The second single fiber collimator plus ultra-narrow bandpass filter at the other end further includes an ultra-narrow bandpass filter 5 , as shown in FIG3 .
[0051] The second single fiber collimator plus ultra-narrow bandpass filter at the other end also includes an outer diameter × 6mm long glass tube 3, as shown in FIG3 .
[0052] The first single fiber collimator and the second single fiber collimator at the other end plus an ultra-narrow bandpass filter are connected through an outer diameter × 16mm long glass tube 6 is connected to assemble the first single-light fiber collimator and the second single-light fiber collimator plus the ultra-narrow bandpass filter. It is permanently cured by a UV glue, such as Figure 1 shown.
[0053] The second technical solution adopted by the present invention is a mini solution with a smaller size:
[0054] One end is the first mini single-light fiber collimator, which includes: a The single optical fiber pigtail 7 has an end surface polished at an angle of 8.5 degrees and is coated with a corresponding anti-reflection film layer.
[0055] The first mini single-light fiber collimator of Solution 2 also includes: a The radial gradient self-focusing lens Glens8 has a focusing constant of 0.60@1550nm, a central refractive index of 1.590@1550nm, and a pitch of 0.23.
[0056] The first mini single-light fiber collimator of solution 2 also includes: an outer diameter × 5mm long glass tube 9, as shown in FIG2 .
[0057] The other end is: the second mini single fiber collimator plus a mini ultra-narrow bandpass filter, which includes: a The single optical fiber pigtail 7 has an end surface polished at an angle of 8.5 degrees and is coated with a corresponding anti-reflection film layer.
[0058] The mini single-light fiber collimator of solution 2 also includes: The radial gradient self-focusing lens Glens10 has a focusing constant of 0.60@1550nm and a central refractive index of 1.590@1550nm. Its pitch varies according to the different incident angle requirements. For the incident angle range required by different ultra-narrow bandpass filters, select the radial gradient self-focusing lens with the corresponding pitch. For an incident angle of 0 to 0.3 degrees, use 0.24 to 0.25 pitches; for an incident angle of 0.3 to 0.6 degrees, use 0.23 to 0.24 pitches; for an incident angle of 0.6 to 0.9 degrees, use 0.22 to 0.23 pitches; for an incident angle of 0.9 to 1.2 degrees, use 0.21 to 0.22 pitches.
[0059] The radial gradient self-focusing lens Glens10 has a flat surface on one side and an 8-degree polished and anti-reflective coating on the other side, and has a small platform of 0.25 mm in length.
[0060] The second mini single fiber collimator plus mini ultra-narrow bandpass filter of Solution 2 further includes: a mini ultra-narrow bandpass filter 11 .
[0061] The second mini single fiber collimator plus mini ultra-narrow bandpass filter of solution 2 also includes: an outer diameter × 5mm long glass tube 9, as shown in FIG3 .
[0062] The first mini single-beam fiber collimator and the second mini single-beam fiber collimator plus mini ultra-narrow bandpass filter are connected through an outer diameter × 15mm long glass tube 12. Used to assemble a single-light fiber collimator and a single-fiber collimator plus a mini ultra-narrow bandpass filter. Permanently cured by a UV glue, such as Figure 1 .
[0063] Corresponding to the incident angle range required by different ultra-narrow bandpass filters, a radial gradient self-focusing lens with a corresponding circumference is selected.
[0064] Solution 1 The radial gradient self-focusing lens Glens4 has different pitches, and the beam deflection angle of the collimator is also different, and the corresponding incident angle of the beam on the ultra-narrow bandpass filter 5 is also different (the collimator beam deflection angle is the incident angle here), and the wavelength offset of the filter is also different. The same applies to solution 2. As shown in the following table.
[0065]
[0066]
[0067] Corresponding to the incident angle range required by different ultra-narrow bandpass filters, a radial gradient self-focusing lens with a corresponding circumference is selected.
[0068] The specific implementation scheme of this embodiment can refer to the relevant description in the above embodiment, which will not be repeated here.
[0069] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.
[0070] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.
[0071] In the description of this specification, the description with reference to 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 this specification, the schematic representation 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.
[0072] The utility model adopts the miniaturized 1×1 port ultra-narrowband bandpass filter device, and uses a single fiber collimator that can control the deflection angle within a very small range of less than 1 degree to accurately control the incident angle, so that when it is incident on the narrowband bandpass filter, it will not cause the incident angle to be too large to distort the waveform of the narrowband bandpass filter, or too small to adjust the waveform to the optimal position and cause obvious etalon effect. It has high coaxiality, strong linearity, compact size, and precise packaging, and can be widely used in the field of optical fiber communication.
[0073] 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 description and drawings should be regarded as illustrative rather than restrictive.
Claims
1. A miniaturized 1×1 port ultra-narrowband bandpass filter device, characterized in that: One end of the device is a first single fiber collimator, and the other end is a second single fiber collimator and an ultra-narrow bandpass filter assembly, wherein the first single fiber collimator comprises a single fiber pigtail, a first radial gradient self-focusing lens and a first glass tube, one end of the single fiber pigtail is a polished surface, the polished surface of the single fiber pigtail is connected to the first radial gradient self-focusing lens, and the single fiber pigtail and the first radial gradient self-focusing lens are fixed in the first glass tube; The second single fiber collimator and ultra-narrow bandpass filter assembly comprises a single fiber pigtail, a second radial gradient self-focusing lens, a small platform processed on the 8-degree polished surface of the second radial gradient self-focusing lens, a first glass tube, and an ultra-narrow bandpass filter. One side of the second radial gradient self-focusing lens is a plane, and the other side has an 8-degree polished surface and is coated with a corresponding anti-reflection film layer. The 8-degree polished surface of the second radial gradient self-focusing lens is connected to the polished surface of the single fiber pigtail. The single fiber pigtail and the second radial gradient self-focusing lens are fixed in the first glass tube. The small platform is processed on the 8-degree polished surface of the second radial gradient self-focusing lens, and the ultra-narrow bandpass filter is installed on the second radial gradient self-focusing lens. The device also includes a second glass tube, and the first single fiber collimator, the second single fiber collimator and the ultra-narrow band pass filter assembly are fixed inside the second glass tube.
2. The miniaturized 1×1 port ultra-narrow bandpass filter device according to claim 1, characterized in that: The end face of the single optical fiber pigtail has a polishing angle of 8.5 degrees and is coated with a corresponding anti-reflection film layer.
3. The miniaturized 1×1 port ultra-narrow bandpass filter device according to claim 1, characterized in that: The second glass tube is used to fix, assemble and solidify the first single fiber collimator, the second single fiber collimator and the ultra-narrow band pass filter assembly by ultraviolet glue.
4. The miniaturized 1×1 port ultra-narrow bandpass filter device according to claim 1, characterized in that: The single optical fiber collimator and ultra-narrow bandpass filter assembly also includes a gasket installed between the second radial gradient self-focusing lens and the ultra-narrow bandpass filter.
5. The miniaturized 1×1 port ultra-narrow bandpass filter device according to claim 1, characterized in that: The diameter of the single optical fiber pigtail is 1.8mm; the diameter of the first radial gradient self-focusing lens is 1.8mm, the focusing constant is 0.33@1550nm, the central refractive index is 1.590@1550nm, and the circumference is 0.23; the outer diameter of the first glass tube is 2.0nm and the length is 6mm; the diameter of the second radial gradient self-focusing lens is 1.8nm, the focusing constant is 0.33@1550nm, the central refractive index is 1.590@1550nm, and different circumferences are selected according to different incident angles; the length of the small platform is 0.35mm; the outer diameter of the second glass tube is 2.7nm and the length is 16mm.
6. The miniaturized 1×1 port ultra-narrow bandpass filter device according to claim 1, characterized in that: The diameter of the single optical fiber pigtail is 1.0nm; the diameter of the first radial gradient self-focusing lens is 1.0nm, the focusing constant is 0.60@1550nm, the central refractive index is 1.590@1550nm, and the pitch is 0.23; the outer diameter of the first glass tube is 1.2nm, and the length is 5mm; the diameter of the second radial gradient self-focusing lens is 1.0nm, the focusing constant is 0.60@1550nm, the central refractive index is 1.590@1550nm, and different pitches are selected according to different incident angles; the length of the small platform is 0.25mm; the outer diameter of the second glass tube is 2nm, and the length is 15mm.