CN210982806U - High-reflection isolation wavelength division multiplexer - Google Patents
High-reflection isolation wavelength division multiplexer Download PDFInfo
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- CN210982806U CN210982806U CN201921693989.3U CN201921693989U CN210982806U CN 210982806 U CN210982806 U CN 210982806U CN 201921693989 U CN201921693989 U CN 201921693989U CN 210982806 U CN210982806 U CN 210982806U
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- 238000002955 isolation Methods 0.000 title claims abstract description 33
- 239000000835 fiber Substances 0.000 claims abstract description 44
- 239000013307 optical fiber Substances 0.000 claims description 77
- 230000003287 optical effect Effects 0.000 claims description 36
- 230000005540 biological transmission Effects 0.000 claims description 16
- 239000011521 glass Substances 0.000 claims description 12
- 230000009977 dual effect Effects 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 235000009537 plain noodles Nutrition 0.000 abstract description 8
- 239000010408 film Substances 0.000 description 28
- 238000005516 engineering process Methods 0.000 description 7
- 239000012528 membrane Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000013475 authorization Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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Abstract
The utility model provides a high reflection isolation wavelength division multiplexer, include the double fiber collimator, three-way plain noodles prism and the single fiber collimator that set gradually along the light path propagation order, three-way plain noodles prism ' S preceding lower extreme has the light-passing surface S1 that the contained angle with vertical axis is α 1, has plated lambda 1 antireflection coating and lambda 2 antireflection coating on this light-passing surface S1, three-way plain noodles prism ' S preceding upper end has the light-passing surface S2 that the contained angle with vertical axis is α 2, has plated lambda 1 high reflection coating and lambda 2 antireflection coating on this light-passing surface S2, three-way plain noodles prism ' S rear end has the light-passing surface S3 that the contained angle with vertical axis is α 3, has plated lambda 1 antireflection coating and lambda 2 high reflection coating on this light-passing surface S3, the utility model discloses have high reflection isolation.
Description
Technical Field
The utility model relates to an optical fiber communication field especially relates to a high reflection isolation wavelength division multiplexer.
Background
Wavelength division multiplexing is a technology of converging two or more optical carrier signals with different wavelengths together at a sending end through a multiplexer and coupling the optical carrier signals into the same optical line for transmission; at the receiving end, the optical carriers of the various wavelengths are separated by a demultiplexer and then further processed by an optical receiver to recover the original signal. This technique of simultaneously transmitting two or more optical signals of different wavelengths in the same optical fiber is called wavelength division multiplexing.
Isolation refers to the amount of light energy that enters the non-designated output port from the device port. It is an important performance indicator for many optical communication devices. Although the single-pass transmission isolation of the current thin film filter technology can be over 50dB, the single-pass reflection isolation is difficult to reach 25 dB. With the development of optical fiber communication technology, the wavelength isolation requirement of wavelength division multiplexing devices is higher and higher, for example, more than 45dB is required in the fiber-to-the-home technology. The existing optical wavelength division multiplexer/demultiplexer only depends on the reflection isolation degree of a diaphragm in front of a lens and is difficult to reach more than 40 dB.
The chinese utility model with the grant publication number CN2450830Y discloses a high-isolation wavelength division multiplexer, in order to make the separated optical carrier have high isolation, on the light-emitting end face of the dual-fiber head in the existing wavelength division multiplexer structure, one side of the outgoing optical fiber is plated with an antireflection film or an optical sheet with an antireflection film is fixed, and the other end face of the dual-fiber head is plated with a WDM film or a fixed WDM film, as shown in fig. 1. However, the two different film systems are plated or two optical sheets are attached to the end faces of the tiny double-fiber heads, so that the process is complex, the cost is high, and the reliability is difficult to guarantee.
The Chinese utility model with the authorization notice number of CN2850146Y discloses a high-isolation optical wavelength division multiplexer/demultiplexer, which comprises a three optical fiber head coated with a special film, a lens, an optical filter and a reflector; one of the three optical fiber heads with different films is coated with a light filter film on the end face, and the other two optical fiber ends are coated with antireflection films; when light is reflected back to the optical fiber with the end surface coated with the filter coating through the first optical filter, the optical signal is isolated again by coating the filter coating on the end surface of the optical fiber, so that the reflection isolation degree is improved; while light transmitted through the first filter is coupled back through the mirror to a third fiber. The three optical fiber heads of the different film can be integrated or assembled. The utility model discloses an adopt three optical fiber heads, this optical fiber head can be assembled into an organic whole again by three monomer optical fiber head terminal surface plate different membrane system or paste the optical sheet that has different membrane system, perhaps plates different membrane system respectively or paste the optical sheet that has different membrane system by a two optical fiber head and a single optical fiber head terminal surface and assemble into an organic whole again, see fig. 2 and show. The utility model discloses a solved the complicated technology of plating different membrane systems on same optic fibre head, but introduced new device in wavelength division multiplexer, increased the degree of difficulty and the device cost of assembly.
Disclosure of Invention
The to-be-solved technical problem of the utility model lies in providing a high reflection isolation wavelength division multiplexer, has the high reflection isolation.
The utility model discloses a realize like this:
a high-reflection isolation wavelength division multiplexer comprises a double-optical-fiber collimator, a three-light-emitting-surface prism and a single-optical-fiber collimator which are sequentially arranged along a light path transmission sequence, wherein the front lower end of the three-light-emitting-surface prism is provided with a light-emitting surface S1 with an included angle of α 1 with a vertical axis, the light-emitting surface S1 is coated with a lambda 1 antireflection film and a lambda 2 antireflection film, the front upper end of the three-light-emitting-surface prism is provided with a light-emitting surface S2 with an included angle of α with the vertical axis, the light-emitting surface S2 is coated with a lambda 1 high-reflection film and a lambda 2 antireflection film, the rear end of the three-light-emitting-surface prism is provided with a light-emitting surface S3 with an included angle of α with the vertical axis, and the light-emitting surface S.
Furthermore, the light passing surfaces S1, S2 and S3 of the three-way light-surface prism form included angles α 1, α 2 and α 3 with the vertical axis, and the relationship is as follows:
wherein t represents the central thickness of the three-way light-transmitting surface prism, and γ 10 represents the included angle between the light beam sent to the light-transmitting surface S1 by the dual-fiber collimator and the optical axis; γ 20 represents the angle between the light beam returned to the dual-fiber collimator by the light-passing surface S2 and the optical axis; n represents the refractive index of the three-way smooth surface prism; d1 represents the distance from the vertex of the lens emergent surface of the dual-fiber collimator to the junction of the light-passing surface S1 and the light-passing surface S2 of the three-light-passing surface prism.
Further, when the beam crossing angle β of the dual-fiber collimator is 3.7 °, α 1 is 8 °, α 2 is-10 °, α 3 is-0.34 °, d1 is 5mm, and the center thickness t of the three-smooth-surface prism is 5.16 mm.
Further, when the beam crossing angle β of the dual-fiber collimator is 3.7 °, α 1 ═ 6 °, α 2 ═ 6 °, α 3 ═ 0 °, d1 ═ 5mm, and the center thickness t of the three-smooth-surface prism is 11.93 mm.
Further, the dual-fiber collimator includes a first lens, a first capillary, an input end fiber and an output end fiber, the first capillary and the first lens are sequentially arranged along a light path transmission sequence, an input fiber fixing hole and an output fiber fixing hole are vertically and symmetrically distributed at an axial center of the first capillary along an optical axis, and the input end fiber and the output end fiber are respectively cemented in the input fiber fixing hole and the output fiber fixing hole.
Further, the dual-fiber collimator further comprises a first outer sleeve, and the first capillary and the first lens are mounted in the first outer sleeve.
Further, the first capillary tube is a glass capillary tube, and the first outer sleeve is a glass sleeve.
Further, the single optical fiber collimator comprises a second lens, a second capillary tube and a receiving optical fiber, the second lens and the second capillary tube are sequentially arranged along a light path transmission sequence, a receiving optical fiber fixing hole is formed in the axial center of the second capillary tube, and the receiving optical fiber is fixedly attached to the receiving optical fiber fixing hole.
Further, the single fiber collimator further comprises a second outer sleeve, and the second capillary tube and the second lens are mounted in the second outer sleeve.
Further, the second capillary tube is a glass capillary tube, and the second outer sleeve is a glass sleeve.
The utility model has the advantages that:
1. the utility model discloses a tee bend plain noodles prism carries out the beam splitting to two bundles of light (lambda 1 light and lambda 2 light) of different wavelengths, through the light passing face S1 at tee bend plain noodles prism, after realizing corresponding transmission and reflection on light passing face S2 and light passing face S3, reach the purpose to the high isolation of lambda 1 light, through the twice reflection of light passing face S2 and light passing face S3, realize that the reflection isolation reaches more than 40dB, overcome the shortcoming that conventional single diaphragm reflection isolation is low;
2. the utility model plates different film systems on different light-passing surfaces of the three-way light surface prism, greatly reduces the difficulty of the film plating process, and overcomes the process difficulty of placing a diaphragm on the end surface of a double optical fiber head;
3. the utility model discloses a two fiber collimator be holistic two fiber head structures, need not to assemble the fiber head that has different membrane systems, make whole device structure compacter, also reduced the technology difficulty of assembly.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a prior art structure.
Fig. 2 is a schematic diagram of another prior art structure.
Fig. 3 is a schematic structural diagram of the high-reflection isolation wavelength division multiplexer of the present invention.
Fig. 4 is a schematic diagram of the light path transmission of the middle light beam through the three-way smooth prism.
The reference numbers in the figures illustrate:
1-double-optical-fiber collimator, 11-first lens, 12-first capillary, 121-input optical-fiber fixing hole, 122-output optical-fiber fixing hole, 13-input optical fiber, 14-output optical fiber, 15-first outer sleeve, 2-three-way light-surface prism, 3-single-optical-fiber collimator, 31-second lens, 32-second capillary, 321-receiving optical-fiber fixing hole, 33-receiving optical fiber, 34-second outer sleeve, light beam sent to light-passing surface S1 by 100-double-optical-fiber collimator, light beam returned to double-optical-fiber collimator from 101-light-passing surface S2 and O-optical axis.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited to the following examples.
Referring to fig. 3 and 4, the wavelength division multiplexer with high reflective isolation of the present invention includes a dual optical fiber collimator 1, a three-way optical surface prism 2 and a single optical fiber collimator 3 sequentially arranged along a light path transmission sequence, the front lower end of the three-way optical surface prism 2 has a light transmitting surface S1 having an included angle of α 1 with a vertical axis, the light transmitting surface S1 is coated with a λ 1 antireflection film and a λ 2 antireflection film, and can perform light antireflection for wavelengths λ 1 and λ 2, the front upper end of the three-way optical surface prism 2 has a light transmitting surface S2 having an included angle of α 2 with the vertical axis, the light transmitting surface S2 is coated with a λ 1 high reflective film and a λ 2 antireflection film, and can perform light antireflection for wavelengths λ 1 and λ 2, the rear end of the three-way optical surface prism 2 has a light transmitting surface S3 having an included angle of α 3 with the vertical axis, the light transmitting surface S3 has λ 1 high reflective film and λ 2 high reflective film, and can perform light antireflection for wavelengths of λ 1 and λ 2, and can greatly reduce the difficulty of light transmitting and light transmitting surfaces of the three-way optical surface prisms and the three-way optical surface can be placed on the light transmitting films, and the three-way optical surface optical fiber collimator 1, and λ 2, and the three-way optical surface can be placed on the optical fiber collimator, and the optical surface S3, and the three-pass optical fiber collimator;
the included angles α 1, α 2 and α 3 between the light passing surface S1, the light passing surface S2 and the light passing surface S3 of the three-way light-passing surface prism 2 and the vertical axis are as follows:
wherein t represents the central thickness of the three-way light-transmitting surface prism 2, and γ 10 represents the included angle between the light beam 100 sent to the light-transmitting surface S1 by the dual-fiber collimator 1 and the optical axis O; γ 20 represents the angle between the light beam 101 returned to the dual fiber collimator 1 by the light passing surface S2 and the optical axis O; n represents the refractive index of the three-way smooth prism 2; d1 represents the distance from the vertex of the lens exit surface of the dual-fiber collimator 1 to the junction of the light-passing surface S1 and the light-passing surface S2 of the light-passing surface prism 2.
Preferably, when the beam intersection angle β of the dual-fiber collimator 1 is 3.7 °, α 1 is 8 °, α 02 is-10 °, α 3 is-0.34 °, d1 is 5mm, the center thickness t of the three-way smooth surface prism 2 is 5.16mm, when the beam intersection angle β of the dual-fiber collimator 1 is 3.7 °, α 1 is 6 °, α 2 is-6 °, α 3 is 0 °, d1 is 5mm, the center thickness t of the three-way smooth surface prism 2 is 11.93mm, where positive and negative signs of α 1, α 2 and α 3 mean that the directions of beam deflection are different, negative signs mean clockwise rotation, and positive signs mean counterclockwise rotation.
Preferably, the structure of the dual-fiber collimator 1 is as follows:
the dual-fiber collimator 1 comprises a first lens 11, a first capillary 12, an input end optical fiber 13, an output end optical fiber 14 and a first outer sleeve 15, wherein the first capillary 12 is a glass capillary, and the first outer sleeve 15 is a glass sleeve; the first capillary 12 and the first lens 11 are sequentially arranged along a light path transmission sequence, the first capillary 12 and the first lens 11 are installed in the first outer sleeve 15, an input optical fiber fixing hole 121 and an output optical fiber fixing hole 122 are vertically and symmetrically distributed at the axial center of the first capillary 12 along an optical axis O, and the input end optical fiber 13 and the output end optical fiber 14 are respectively adhered to the input optical fiber fixing hole 121 and the output optical fiber fixing hole 122.
Preferably, the structure of the single fiber collimator 3 is as follows:
the single optical fiber collimator 3 comprises a second lens 31, a second capillary tube 32, a receiving optical fiber 33 and a second outer sleeve 34, wherein the second capillary tube 32 is a glass capillary tube, and the second outer sleeve 34 is a glass sleeve; the second lens 31 and the second capillary 32 are sequentially arranged along the propagation sequence of the light path, and the second capillary 32 and the second lens 31 are installed in the second outer sleeve 34; a receiving optical fiber fixing hole 321 is provided at an axial center of the second capillary 32, and the receiving optical fiber 33 is cemented in the receiving optical fiber fixing hole 321.
Description of the working principle:
λ 1 light and λ 2 light with different wavelengths are emitted from an input optical fiber 13 of the dual optical fiber collimator 1, collimated by a first lens 11 and then incident on a light transmission surface S1 of the three-way light-surface prism 2, the light transmission surface S1 is coated with antireflection films for λ 1 and λ 2, and the λ 1 light and the λ 2 light continue to be transmitted to a light transmission surface S3 of the three-way light-surface prism 2; the light transmitting surface S3 is plated with a film system for increasing the reflection of lambda 1 and improving the reflection of lambda 2, and lambda 1 light is emitted from the three-way light-transmitting surface prism 2 to the single optical fiber collimator 3 and is coupled into the receiving optical fiber 33 through the second lens 31; the lambda 2 light and the partial residual lambda 1 light which is not completely anti-reflection are reflected to the light passing surface S2 of the three-light-surface prism 2; the light transmitting surface S2 is coated with a film system for increasing reflection of lambda 1 and lambda 2, a small amount of residual lambda 1 light is reflected from the light transmitting surface S2, and the reflected light deviates from the receiving range of the output optical fiber 14 of the dual-fiber collimator 1, so that the aim of high isolation of the lambda 1 light is fulfilled. The lambda 2 light anti-reflection light is emitted from the three-smooth-surface prism 2 to the dual-optical-fiber collimator 1, and is coupled by the first lens 11 and then enters the output optical fiber 14. Through different angle combinations, the λ 1 light and the λ 2 light are coupled into the receiving fiber 33 and the output fiber 14, respectively.
The utility model has the advantages as follows:
1. the utility model discloses a tee bend plain noodles prism 2 carries out the beam splitting to two bundles of light (lambda 1 light and lambda 2 light) of different wavelengths, through the light passing surface S1 at tee bend plain noodles prism 2, light passing surface S2 and light passing surface S3 on realize corresponding transmission and reflection back, reach the purpose to the high isolation of lambda 1 light, through the twice reflection of light passing surface S2 and light passing surface S3, realize that the reflection isolation reaches more than 40dB, overcome the shortcoming that conventional single diaphragm reflection isolation is low;
2. the utility model plates different film systems on different light-passing surfaces of the three-way light surface prism 2, the difficulty of the film plating process is greatly reduced, and the process difficulty of placing a diaphragm on the end surface of a double optical fiber head is overcome;
3. the utility model discloses a two optical collimator 1 be holistic two optical fiber head structures, need not to assemble the optical fiber head that has different membrane systems, make whole device structure compacter, also reduced the technology difficulty of assembly.
Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.
Claims (10)
1. A high-reflection isolation wavelength division multiplexer is characterized by comprising a double-optical-fiber collimator, a three-light-emitting-surface prism and a single-optical-fiber collimator which are sequentially arranged along a light path transmission sequence, wherein the front lower end of the three-light-emitting-surface prism is provided with a light-emitting surface S1 with an included angle of α with a vertical axis, the light-emitting surface S1 is coated with a lambda 1 antireflection film and a lambda 2 antireflection film, the front upper end of the three-light-emitting-surface prism is provided with a light-emitting surface S2 with an included angle of α with the vertical axis, the light-emitting surface S2 is coated with a lambda 1 high-reflection film and a lambda 2 antireflection film, the rear end of the three-light-emitting-surface prism is provided with a light-emitting surface S3 with an included angle of α with the vertical axis, and the light-emitting surface S3.
2. The wavelength division multiplexer according to claim 1, wherein the light-passing surfaces S1, S2 and S3 of the three-way light-passing surface prism have included angles α 1, α 2 and α 3 with respect to the vertical axis, which satisfy the following relations:
wherein t represents the central thickness of the three-way light-transmitting surface prism, and γ 10 represents the included angle between the light beam sent to the light-transmitting surface S1 by the dual-fiber collimator and the optical axis; γ 20 represents the angle between the light beam returned to the dual-fiber collimator by the light-passing surface S2 and the optical axis; n represents the refractive index of the three-way smooth surface prism; d1 represents the distance from the vertex of the lens emergent surface of the dual-fiber collimator to the junction of the light-passing surface S1 and the light-passing surface S2 of the three-light-passing surface prism.
3. The wavelength division multiplexer according to claim 2, wherein when the beam crossing angle β of the dual fiber collimator is 3.7 °, α 1 ═ 8 °, α 2 ═ 10 °, α 3 ═ 0.34 °, d1 ═ 5mm, and the center thickness t of the three-way smooth surface prism is 5.16 mm.
4. The wavelength division multiplexer according to claim 2, wherein when the beam crossing angle β of the dual fiber collimator is 3.7 °, α 1 ═ 6 °, α 2 ═ 6 °, α 3 ═ 0 °, d1 ═ 5mm, and the center thickness t of the three-facet prism is 11.93 mm.
5. A high reflection isolation wavelength division multiplexer as claimed in claim 1, wherein: the dual-optical-fiber collimator comprises a first lens, a first capillary tube, an input end optical fiber and an output end optical fiber, wherein the first capillary tube and the first lens are sequentially arranged along a light path transmission sequence, an input optical fiber fixing hole and an output optical fiber fixing hole are symmetrically distributed at the axial center of the first capillary tube up and down along an optical axis, and the input end optical fiber and the output end optical fiber are respectively adhered to the input optical fiber fixing hole and the output optical fiber fixing hole.
6. The high reflection isolation wavelength division multiplexer according to claim 5, wherein: the dual-fiber collimator further comprises a first outer sleeve, and the first capillary and the first lens are mounted in the first outer sleeve.
7. The high reflection isolation wavelength division multiplexer according to claim 6, wherein: the first capillary tube is a glass capillary tube, and the first outer sleeve is a glass sleeve.
8. A high reflection isolation wavelength division multiplexer as claimed in claim 1, wherein: the single optical fiber collimator comprises a second lens, a second capillary tube and a receiving optical fiber, wherein the second lens and the second capillary tube are sequentially arranged along a light path transmission sequence, a receiving optical fiber fixing hole is formed in the axial center of the second capillary tube, and the receiving optical fiber is fixedly adhered in the receiving optical fiber fixing hole.
9. The high reflection isolation wavelength division multiplexer according to claim 8, wherein: the single fiber collimator also comprises a second outer sleeve, and the second capillary tube and the second lens are arranged in the second outer sleeve.
10. The high reflection isolation wavelength division multiplexer according to claim 9, wherein: the second capillary tube is a glass capillary tube, and the second outer sleeve is a glass sleeve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921693989.3U CN210982806U (en) | 2019-10-11 | 2019-10-11 | High-reflection isolation wavelength division multiplexer |
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| CN201921693989.3U CN210982806U (en) | 2019-10-11 | 2019-10-11 | High-reflection isolation wavelength division multiplexer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115166908A (en) * | 2022-07-22 | 2022-10-11 | 光信(徐州)电子科技有限公司 | Dense wavelength division multiplexer |
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2019
- 2019-10-11 CN CN201921693989.3U patent/CN210982806U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115166908A (en) * | 2022-07-22 | 2022-10-11 | 光信(徐州)电子科技有限公司 | Dense wavelength division multiplexer |
| CN115166908B (en) * | 2022-07-22 | 2023-10-10 | 光信(徐州)电子科技有限公司 | Dense wavelength division multiplexer |
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