CN110737051A - high-reflection isolation wavelength division multiplexer - Google Patents
high-reflection isolation wavelength division multiplexer Download PDFInfo
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- CN110737051A CN110737051A CN201910961896.2A CN201910961896A CN110737051A CN 110737051 A CN110737051 A CN 110737051A CN 201910961896 A CN201910961896 A CN 201910961896A CN 110737051 A CN110737051 A CN 110737051A
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- 238000002955 isolation Methods 0.000 title claims abstract description 32
- 239000013307 optical fiber Substances 0.000 claims abstract description 42
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims description 77
- 230000003287 optical effect Effects 0.000 claims description 27
- 239000011521 glass Substances 0.000 claims description 12
- 230000009977 dual effect Effects 0.000 claims description 9
- 239000010408 film Substances 0.000 description 38
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 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
- 238000012986 modification Methods 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention provides high-reflection isolation wavelength division multiplexers, which comprise 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 plated 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 2 with the vertical axis, the light-emitting surface S2 is plated 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 3 with the vertical axis, and the light-emitting surface S3.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to an high-reflection isolation wavelength division multiplexer.
Background
Wavelength division multiplexing is a technique of combining two or more optical carrier signals with different wavelengths at a transmitting end through a multiplexer at and coupling the optical carrier signals into optical lines for transmission, and at a receiving end, optical carriers with various wavelengths are separated through a demultiplexer and then are subjected to processing by an optical receiver to recover the original signals.
The isolation degree refers to the light energy of the light entering the non-designated output port of the device port, which is important performance indexes of many optical communication devices, although the single transmission isolation degree of the existing thin film optical filter technology can be more than 50dB, the single reflection isolation degree is difficult to reach 25dB, along with the development of the optical fiber communication technology, the requirement on the wavelength isolation degree of the wavelength division multiplexing device is higher and higher, for example, the requirement on the fiber-to-the-home technology is more than 45dB, and the existing optical wavelength division multiplexer/demultiplexer only depends on the diaphragms in front of the lens to reflect the isolation degree which is difficult to reach more than 40 dB.
The chinese utility model with the grant publication number CN2450830Y discloses high-isolation wavelength division multiplexers, in order to make the separated optical carriers have high isolation, on the light-emitting end face of the dual-fiber head in the existing wavelength division multiplexer structure, the optical sheet containing the light-emitting fiber side is plated with an antireflection film or fixed with an antireflection film, and the other optical fiber end face containing the light-receiving dual-fiber head is plated with a WDM film or fixed with a WDM film, as shown in fig. 1.
The Chinese utility model with the grant publication number of CN2850146Y discloses high-isolation optical wavelength division multiplexer/demultiplexer, which comprises a special film-coated three-fiber head, a lens, a filter and a reflector, wherein fiber end faces of the special film three-fiber head are plated with a filter film, the other two fiber end faces are plated with an antireflection film, when light returns to the fiber coated with the filter film on the end face through the 0 filter, the fiber end faces are plated with the filter film to isolate the optical signal for times, thereby improving the reflection isolation, while the light transmitted through the filter is returned to the third fiber through the reflector, the special film three-fiber head can be body or assembled, the utility model adopts three fiber heads, the fiber head can be assembled into body by plating different film systems on the end faces of three single fiber heads or attaching optical sheets with different film systems, or can be assembled into body by attaching different film systems to the end faces of three single fiber heads or can be attached with different film systems, or the optical sheets with different film systems can be assembled into optical wavelength division multiplexer, the new practical and the assembly cost is increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing high-reflection isolation wavelength division multiplexers with high-reflection isolation.
The invention is realized by the following steps:
A high-reflection isolation wavelength division multiplexer comprises a double-fiber collimator, a three-light-emitting surface prism and a single-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-passing surface S1 with an included angle of α 1 with a vertical axis, the light-passing 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-passing surface S2 with an included angle of α 2 with the vertical axis, the light-passing 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-passing surface S3 with an included angle of α 3 with the vertical axis, and the light-passing surface S3 is coated with a.
, 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 included angles 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.
And , 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.
And , when the beam crossing angle β of the dual-fiber collimator is 3.7 °, α 1 is 6 °, α 2 is-6 °, α 3 is 0 °, d1 is 5mm, and the center thickness t of the three-way smooth-surface prism is 11.93 mm.
, the dual fiber collimator includes a lens, a capillary, an input end fiber and an output end fiber, the capillary and the lens are sequentially arranged along the light path transmission sequence, an input fiber fixing hole and an output fiber fixing hole are symmetrically distributed at the axial center of the capillary along the 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.
, the dual fiber collimator further includes a outer sleeve, the th capillary and the th lens are mounted in the th outer sleeve.
, the th capillary is a glass capillary and the th outer sleeve is a glass sleeve.
, the single fiber collimator includes a second lens, a second capillary and a receiving fiber, the second lens and the second capillary are arranged in sequence along the light path, the axial center of the second capillary is provided with a receiving fiber fixing hole, and the receiving fiber is fixed in the receiving fiber fixing hole.
, the single fiber collimator further includes a second outer sleeve, the second capillary tube and the second lens being mounted within the second outer sleeve.
, the second capillary tube is a glass capillary tube, and the second outer sleeve is a glass sleeve.
The invention has the advantages that:
1. the three-way smooth surface prism is adopted to split two beams of light (lambda 1 light and lambda 2 light) with different wavelengths, the aim of high isolation of the lambda 1 light is achieved after corresponding transmission and reflection are achieved on the light passing surfaces S1, S2 and S3 of the three-way smooth surface prism, the reflection isolation is achieved to be more than 40dB through twice reflection of the light passing surfaces S2 and S3, and the defect that a conventional single diaphragm is low in reflection isolation is overcome;
2. according to the invention, different film systems are plated on different light-passing surfaces of the three-way light-surface prism, so that the difficulty of a film plating process is greatly reduced, and the process difficulty of placing a film on the end surface of a double-optical-fiber head is overcome;
3. the double-optical fiber collimator adopted by the invention is an integral double-optical fiber head structure, and optical fiber heads with different film systems are not required to be assembled, so that the integral device structure is more compact, and the difficulty of the assembly process is reduced.
Drawings
The invention is further described with reference to the following examples and figures.
FIG. 1 is a schematic diagram of showing a prior art structure.
Fig. 2 is another schematic diagram of a prior art structure.
Fig. 3 is a schematic structural diagram of high-reflection isolation wavelength division multiplexers according to the invention.
FIG. 4 is a schematic diagram of the optical path transmission of the light beam through the three-way smooth prism according to the present invention.
The reference numbers in the figures illustrate:
1-double-optical-fiber collimator, 11- th lens, 12- th capillary tube, 121-input optical-fiber fixing hole, 122-output optical-fiber fixing hole, 13-input optical fiber, 14-output optical fiber, 15- th outer sleeve, 2-three-way plain-surface prism, 3-single-optical-fiber collimator, 31-second lens, 32-second capillary tube, 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 by 101-light-passing surface S2 and O-optical axis.
Detailed Description
The present invention will be described in further detail in with reference to specific examples, but the structure of the present invention is not limited to the following examples.
Referring to fig. 3 and 4, the high-reflection isolation wavelength division multiplexers of the invention include a dual-fiber collimator 1, a three-smooth-surface prism 2 and a single-fiber collimator 3 sequentially arranged along a light path transmission sequence, the front lower end of the three-smooth-surface prism 2 is provided with a light-transmitting surface S1 having an included angle 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 on wavelengths λ 1 and λ 2, the front upper end of the three-smooth-surface prism 2 is provided with a light-transmitting surface S2 having an included angle α 2 with the vertical axis, the light-transmitting surface S2 is coated with a λ 1 high-reflection film and a λ 2 antireflection film, and can perform light antireflection on wavelengths λ 1 and λ 2, and perform light antireflection on wavelengths λ 2, and can perform light antireflection on wavelengths 1 and λ 2, and can greatly reduce the difficulty of light-transmitting and light-transmitting of the three-smooth-surface S3 having an included angle α 3 with the vertical axis, the light-transmitting surface S3 is coated with λ 1 high-reflection films, and can be used for light-transmitting surfaces of the three-smooth-fiber collimator 1 and for achieving the purposes of the three-optical-transmitting and the three-optical fiber collimator, and the three-optical fiber collimator 3, and the difficulty of the three-optical-transmitting surfaces of the three-transmitting surfaces is reduced by adopting the three-transmitting films;
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 an th lens 11, a th capillary tube 12, an input end optical fiber 13, an output end optical fiber 14 and a 0 th outer sleeve 15, wherein the th capillary tube 12 is a glass capillary tube, the th outer sleeve 15 is a glass sleeve, the th capillary tube 12 and the th lens 11 are sequentially arranged along a light path transmission sequence, the th capillary tube 12 and the th lens 11 are installed in the th outer sleeve 15, an input fiber fixing hole 121 and an output fiber fixing hole 122 are vertically and symmetrically distributed at the axial center of the th capillary tube 12 along an optical axis O, and the input end optical fiber 13 and the output end optical fiber 14 are respectively fixedly adhered in the input fiber fixing hole 121 and the output 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, and are collimated by a lens 11 and then incident on a light transmitting surface S1 of a three-way light-transmitting surface prism 2, a light transmitting surface S1 is coated with antireflection films for λ 1 and λ 2, the λ 1 light and the λ 2 light continue to propagate to a light transmitting surface S3 of the three-way light-transmitting surface prism 2, a light transmitting surface S3 is coated with a film system for increasing the antireflection of λ 1 and λ 2, the λ 1 light is emitted from the three-way light-transmitting surface prism 2 to the single optical fiber collimator 3 and is coupled into a receiving optical fiber 33 through a second lens 31, the λ 2 light and part of the residual λ 1 light which is not fully antireflection film coated on the light transmitting surface S2 of the three-way light-transmitting surface S2, the λ 1 light is increased in the antireflection film system for λ 2, a small amount of the residual λ 1 light is reflected from the light transmitting surface S2 and deviates from a receiving range of an output optical fiber 14 of the dual optical fiber collimator 1, so that the λ 1 light with high isolation degree is coupled into the three-way optical fiber 14 and the light receiving optical fiber 14, and the light is coupled into the receiving optical fiber 14, so that the λ 1 light and the light enters the light and the light output.
The invention has the following advantages:
1. the three-way smooth surface prism 2 is adopted to split two beams of light (lambda 1 light and lambda 2 light) with different wavelengths, the aim of high isolation of the lambda 1 light is achieved after corresponding transmission and reflection are achieved on the light passing surface S1, the light passing surface S2 and the light passing surface S3 of the three-way smooth surface prism 2, the reflection isolation is achieved to be more than 40dB through twice reflection of the light passing surface S2 and the light passing surface S3, and the defect that the reflection isolation of a conventional single diaphragm is low is overcome;
2. according to the invention, different film systems are plated on different light-passing surfaces of the three-way light-surface prism 2, so that the difficulty of a film plating process is greatly reduced, and the process difficulty of placing a film on the end surface of a double-optical-fiber head is overcome;
3. the dual-fiber collimator 1 adopted by the invention is an integral dual-fiber structure, and the fiber heads with different film systems are not required to be assembled, so that the integral device structure is more compact, and the difficulty of the assembly process is reduced.
Although specific embodiments of the invention have been described above, 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 appended claims.
Claims (10)
- The wavelength division multiplexer with high reflection isolation 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-transmitting surface S1 with an included angle of α 1 with a vertical axis, the light-transmitting 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-transmitting surface S2 with an included angle of α 2 with the vertical axis, the light-transmitting 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-transmitting surface S3 with an included angle of α 3 with the vertical axis, and the light-transmitting surface S3.
- 2. The wavelength division multiplexer with high reflective isolation as claimed in claim 1, wherein the light-passing surfaces S1, S2 of the three-way light-surface prism and the included angles α 1, α 2 and α 3 of the light-passing surfaces S3 with the vertical axis 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 with high reflection isolation as set forth in 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 with high reflection isolation as set forth in claim 2, wherein when the beam crossing angle β of the dual fiber collimator is 3.7 °, α 1 is 6 °, α 2 is-6 °, α 3 is 0 °, d1 is 5mm, and the center thickness t of the three-way smooth surface prism is 11.93 mm.
- 5. The wavelength division multiplexer with high reflective isolation as claimed in claim 1, wherein the dual fiber collimator includes a th lens, a th capillary, an input end fiber and an output end fiber, the th and th lenses are sequentially disposed along the optical path, an input fiber fixing hole and an output fiber fixing hole are symmetrically distributed along the optical axis at the axial center of the th capillary, and the input end fiber and the output end fiber are respectively fixed in the input fiber fixing hole and the output fiber fixing hole.
- 6. The high reflection isolation wavelength division multiplexer of claim 5, wherein the dual fiber collimator further includes a th outer sleeve, the th capillary and the th lens are mounted in the th outer sleeve.
- 7. The wavelength division multiplexer according to claim 6, wherein the capillary is a glass capillary and the outer sleeve is a glass sleeve.
- 8. The wavelength division multiplexer with high reflective isolation as claimed in claim 1, wherein the single fiber collimator includes a second lens, a second capillary and a receiving fiber, the second lens and the second capillary are sequentially disposed along the optical path, the second capillary has a receiving fiber fixing hole at its axial center, and the receiving fiber is fixed in the receiving fiber fixing hole.
- 9. The wavelength division multiplexer of claim 8, wherein the single fiber collimator further includes a second outer sleeve, and the second capillary tube and the second lens are mounted in the second outer sleeve.
- 10. The wavelength division multiplexer according to claim 9, wherein the second capillary is a glass capillary and the second outer sleeve is a glass sleeve.
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| CN201910961896.2A CN110737051A (en) | 2019-10-11 | 2019-10-11 | high-reflection isolation wavelength division multiplexer |
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| CN201910961896.2A CN110737051A (en) | 2019-10-11 | 2019-10-11 | high-reflection isolation wavelength division multiplexer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111399140A (en) * | 2020-03-31 | 2020-07-10 | 福建华科光电有限公司 | High-isolation one-way photoelectric detector |
| CN115166908A (en) * | 2022-07-22 | 2022-10-11 | 光信(徐州)电子科技有限公司 | Dense wavelength division multiplexer |
-
2019
- 2019-10-11 CN CN201910961896.2A patent/CN110737051A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111399140A (en) * | 2020-03-31 | 2020-07-10 | 福建华科光电有限公司 | High-isolation one-way photoelectric detector |
| 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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