CN113805279B - Integrated device with isolation and wavelength division multiplexing functions - Google Patents
Integrated device with isolation and wavelength division multiplexing functions Download PDFInfo
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- CN113805279B CN113805279B CN202111153959.5A CN202111153959A CN113805279B CN 113805279 B CN113805279 B CN 113805279B CN 202111153959 A CN202111153959 A CN 202111153959A CN 113805279 B CN113805279 B CN 113805279B
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- 238000002955 isolation Methods 0.000 title claims abstract description 24
- 239000013307 optical fiber Substances 0.000 claims abstract description 226
- 239000013078 crystal Substances 0.000 claims abstract description 75
- 230000010287 polarization Effects 0.000 claims abstract description 25
- 230000003287 optical effect Effects 0.000 claims description 25
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910009372 YVO4 Inorganic materials 0.000 claims description 3
- 238000003780 insertion Methods 0.000 abstract description 28
- 230000037431 insertion Effects 0.000 abstract description 28
- 230000001419 dependent effect Effects 0.000 description 12
- 230000010354 integration Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- G02B6/29302—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 based on birefringence or polarisation, e.g. wavelength dependent birefringence, polarisation interferometers
-
- 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
-
- 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
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The application relates to aAn integrated device with isolation and wavelength division multiplexing functions is composed of sequentially arranged optical fibre head, walk-off crystal and lambda 1 Input wave plate lambda 2 An input wave plate, a lens, a rotating plate and a wedge angle reflecting mirror; lambda (lambda) 1 The wavelength of the light beam is less than lambda 2 The wavelength of the light beam; the lambda is 1 The light beam is input by the 1 st optical fiber in the optical fiber head and sequentially passes through the walk-off crystal and lambda 1 After the wave plate and the lens are input, the wave plate and the lens are reflected on a WDM film of the lens, and finally the wave plate is output from a 3 rd optical fiber in the optical fiber head; the lambda is 2 The light beam is input by the 2 nd optical fiber in the optical fiber head and passes through the walk-off crystal lambda 2 After the wave plate, the lens, the rotating piece and the wedge angle reflecting mirror are input, the light is reflected on the wedge angle surface of the wedge angle reflecting mirror, and finally is output from the 3 rd optical fiber in the optical fiber head through the output wave plate, and the insertion loss IL, the polarization-related insertion loss PDL and the isolation ISO of the device are optimized by adopting the technical scheme.
Description
Technical Field
The application relates to the field of optical fiber communication, in particular to an integrated device with isolation and wavelength division multiplexing functions.
Background
In an optical communication device, an isolator is a non-reciprocal passive device that inputs and outputs signal light. The wavelength division multiplexer is a device capable of realizing optical signal lambda 1 And lambda (lambda) 2 A passive device for combining and splitting waves. The integration of device functions is an important development trend, and the integration of an isolator and a wavelength division multiplexer is a typical representative of the integration. An important problem that functional integration faces is degradation of device indicators.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides an integrated device with isolation and wavelength division multiplexing functions, which optimizes the insertion loss IL, the polarization-dependent insertion loss PDL and the isolation ISO of the device.
The application relates to an integrated device with isolation and wavelength division multiplexing functions, which adopts the following technical scheme that the integrated device comprises an optical fiber head, a walk-off crystal and lambda which are sequentially arranged 1 Input wave plate lambda 2 An input wave plate, a lens, a rotating plate and a wedge angle reflecting mirror;
the optical fiber head establishes an XY axis along a plane perpendicular to the horizontal direction, and is obliquely arranged by taking the X axis as an axis, and comprises a 1 st optical fiber, a 2 nd optical fiber and a 3 rd optical fiber;
the walk-off crystal is coaxially parallel to the optical fiber head and is tightly attached to the inclined surface of the optical fiber head, and the inclined angle between the optical axis of the walk-off crystal and the normal line of the incident surface is 45 degrees;
λ 1 an input wave plate corresponding to the 1 st optical fiber and clung to the walk-off crystal, lambda 1 The input wave plate transmits lambda 1 A light beam;
λ 2 an input wave plate corresponding to the 2 nd optical fiber and clung to the walk-off crystal, lambda 2 The input wave plate transmits lambda 2 A light beam;
a lens with one end being an inclined plane and the other end being a plane, the inclined plane being parallel to the optical fiber head and being close to the walk-away crystal, the inclined plane being coated with lambda 1 Wavelength and lambda of the light beam 2 An AR film of the wavelength of the light beam, the plane being coated with a WDM film having a wavelength of lambda 1 Reflection of wavelength of light beam, for lambda 2 Transmission of the wavelength of the light beam;
the two ends of the rotary sheet are plane surfaces, and lambda is plated on the plane surfaces 2 AR film of wavelength of light beam, rotation angle of polarization of rotation plate is 22.5 DEG, rotation direction and lambda 2 The rotation directions of the polarization of the input wave plate are the same;
wedge angle reflector with one end plane near the rotating plate and the other end wedge angle surface with lambda plated 2 An AR film of the wavelength of the light beam, the wedge angle surface being coated with lambda 2 HR film of wavelength of the light beam;
the lambda is 1 The wavelength of the light beam is less than lambda 2 The wavelength of the light beam; the lambda is 1 The light beam is input by the 1 st optical fiber or the 3 rd optical fiber in the optical fiber head and sequentially passes through the walk-off crystal and lambda 1 After the wave plate and the lens are input, the wave plate and the lens are reflected on a WDM film of the lens, and finally the wave plate and the lens are output from a 3 rd optical fiber or a 1 st optical fiber in the optical fiber head; the lambda is 2 The light beam is input by the 2 nd optical fiber in the optical fiber head and passes through the walk-off crystal lambda 2 After the wave plate, the lens, the rotary piece and the wedge angle reflector are input, the reflection is carried out on the wedge angle surface of the wedge angle reflector, and finally the reflection is output from the 3 rd optical fiber in the optical fiber head.
Having isolation and wavelength division multiplexing functionsAn integrated device comprising an optical fiber head, a walk-off crystal, lambda 1 Input wave plate lambda 2 The optical element comprises an input wave plate, an output wave plate, a lens, a rotary plate and a wedge angle reflecting mirror;
the optical fiber head establishes an XY axis along a plane perpendicular to the horizontal direction, and is obliquely arranged by taking the X axis as an axis, and comprises a 1 st optical fiber, a 2 nd optical fiber and a 3 rd optical fiber;
the walk-off crystal is coaxially parallel to the optical fiber head and is tightly attached to the inclined surface of the optical fiber head, and the inclined angle between the optical axis of the walk-off crystal and the normal line of the incident surface is 45 degrees;
λ 1 an input wave plate corresponding to the 1 st optical fiber and the 3 rd optical fiber and closely attached to the walk-off crystal, lambda 1 The input wave plate transmits lambda 1 A light beam;
λ 2 an input wave plate corresponding to the 2 nd optical fiber and clung to the walk-off crystal, lambda 2 The input wave plate transmits lambda 2 A light beam;
an output wave plate, which is closely attached to the walk-off crystal corresponding to the 3 rd optical fiber;
a lens with one end being an inclined plane and the other end being a plane, the inclined plane being parallel to the optical fiber head and being close to the walk-away crystal, the inclined plane being coated with lambda 1 Wavelength and lambda of the light beam 2 An AR film of the wavelength of the light beam, the plane being coated with a WDM film having a wavelength of lambda 1 Reflection of wavelength of light beam, for lambda 2 Transmission of the wavelength of the light beam;
the two ends of the rotary sheet are plane surfaces, and lambda is plated on the plane surfaces 2 AR film of wavelength of light beam, rotation angle of polarization of rotation plate is 22.5 DEG, rotation direction and lambda 2 The rotation directions of the polarization of the input wave plate are the same;
wedge angle reflector with one end plane near the rotating plate and the other end wedge angle surface with lambda plated 2 An AR film of the wavelength of the light beam, the wedge angle surface being coated with lambda 2 HR film of wavelength of the light beam;
the lambda is 1 The wavelength of the light beam is less than lambda 2 The wavelength of the light beam; the lambda is 1 The light beam is input by the 1 st optical fiber or the 3 rd optical fiber in the optical fiber head and sequentially passes through the walk-off crystal,λ 1 After the wave plate and the lens are input, the wave plate and the lens are reflected on a WDM film of the lens, and finally the wave plate is output from a 3 rd optical fiber or a 1 st optical fiber in the optical fiber head; the lambda is 2 The light beam is input by the 2 nd optical fiber in the optical fiber head and passes through the walk-off crystal lambda 2 After the wave plate, the lens, the rotary piece and the wedge angle reflector are input, the reflection is carried out on the wedge angle surface of the wedge angle reflector, and finally the reflection is output from the 3 rd optical fiber in the optical fiber head through the output wave plate.
Further, the optical fiber head is inclined at an inclination angle of 8 ° with respect to the X-axis.
Further, the 1 st optical fiber, the 2 nd optical fiber and the 3 rd optical fiber are arranged in a triangle, square or linear mode.
Further, the square arrangement is that the 1 st optical fiber, the 2 nd optical fiber and the 3 rd optical fiber are closely arranged along the four quadrants of the XY axis, the 1 st optical fiber is arranged in the fourth quadrant, the 2 nd optical fiber is arranged in the third quadrant, the 3 rd optical fiber is arranged in the first quadrant, the 1 st optical fiber and the 3 rd optical fiber are the high end of the optical fiber head, and the 2 nd optical fiber is the low end of the optical fiber head.
Further, the linear arrangement is that the 1 st optical fiber, the 3 rd optical fiber and the 2 nd optical fiber are sequentially and tightly arranged along the X-axis direction, the 1 st optical fiber is the high end of the optical fiber head, and the 2 nd optical fiber is the low end of the optical fiber head.
Further, the main section of the crystal is perpendicular to the plane formed by the 1 st optical fiber and the 3 rd optical fiber, and o light and e light generated by double refraction of the walk-off crystal are separated on the main section of the crystal.
Further, the walk-off crystal is YVO4, and the thickness of the walk-off crystal is 0.2mm.
Further, the lambda 1 Input waveplate lambda 2 The input wave plate is a 0-level quartz wave plate.
Further, the lens is a C lens or a G lens.
Compared with the prior art, the application has the following beneficial effects:
1. by optical fiber head, walk-off crystal, lambda 1 Input wave plate lambda 2 The input wave plate, the lens, the rotary plate and the wedge angle reflector are arranged in sequence, and the optical fiber head is obliquely arranged, so that the insertion loss IL of the integrated device and the polarization correlation can be realizedSignificant optimization of insertion loss PDL and isolation ISO;
2. the optical axis of the walk-off crystal is obliquely intersected with the normal line of the incident surface, and the main section of the crystal formed by the optical axis and the normal line of the incident surface is vertical to the plane formed by the 1 st optical fiber and the 3 rd optical fiber; the o light and e light generated by double refraction are separated on the main section of the crystal, so that lambda can be realized by a light splitting mode 1 Beam sum lambda 2 The polarization dependent insertion loss PDL of the light beam is minimal;
3. when the light splitting plane of o light and e light generated by double refraction is inclined parallel to X axis, the e light deviates from the direction of the lower end of the optical fiber head, so that lambda can be raised 2 The isolation degree ISO of the light beam, the debugging position offset of the optical fiber head and the lens is reduced, which is beneficial to the structure connection and encapsulation of the optical fiber head and the lens;
4、λ 1 input waveplate lambda 2 The input wave plate adopts a 0-level wave plate, the inclination angle of the optical fiber head taking the X axis as the inclination is 8 degrees, the 1 st optical fiber is the high end of the optical fiber head, and the 2 nd optical fiber is the low end of the optical fiber head, thereby realizing lambda 1 Beam sum lambda 2 The optical path difference of the light beam reaches the optimal matching state lambda 1 Beam sum lambda 2 The insertion loss IL of the beam is significantly reduced;
5. the light spot of the reflected light can be reduced by adopting the output wave plate, so that lambda 1 Input waveplate lambda 2 The position tolerance of the input wave plate is increased, and the assembly difficulty is reduced;
6. the lens is C lens or G lens, preferably G lens, and can be realized at lambda when the relative angle position of the lens and the rotary piece and the relative angle position of the wedge angle reflector and the rotary piece are deformed due to external force or temperature stress 1 Beam sum lambda 2 When the insertion loss of the light beam significantly deteriorates, λ 1 Beam sum lambda 2 The polarization dependent insertion loss PDL of the light beam is not significantly degraded.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and/or provide a further understanding of the application, and wherein:
FIG. 1 is a schematic diagram of an optical fiber arrangement on an optical fiber head according to a first embodiment of the present application;
FIG. 2 is a schematic view of an optical path according to a first embodiment of the present application;
FIG. 3 is a schematic diagram of an optical path after adding an output waveplate according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an optical fiber arrangement on an optical fiber head according to a second embodiment of the present application;
fig. 5 is a schematic view of an optical path according to a second embodiment of the present application.
Detailed Description
Referring to fig. 1, 2 and 3, since the optical fibers in the optical fiber head have various arrangements, such as triangle, square or linear arrangements; in order to more clearly express the present application, the following will take tetragonal and linear forms as examples, two embodiments of the present application will be described, and λ in the other embodiments 1 The wavelength of the light beam is less than lambda 2 The wavelength of the light beam; lambda (lambda) 1 The wavelength of the light beam is 980nm lambda 2 1550nm of the beam.
Referring to fig. 1 and 2, an integrated device with isolation and wavelength division multiplexing functions in a first embodiment adopts the following technical scheme that the integrated device comprises an optical fiber head 1, a walk-off crystal 2 and a lambda which are sequentially arranged 1 Input waveplate 3, lambda 2 An input wave plate 4, a lens 5, a rotating plate 6 and a wedge angle mirror 7;
the optical fiber head 1 establishes an XY axis along a plane perpendicular to the horizontal direction, the optical fiber head 1 is obliquely arranged by taking the X axis as an inclination angle of 8 degrees; the optical fiber head comprises a 1 st optical fiber 11, a 2 nd optical fiber 12 and a 3 rd optical fiber 13; the 1 st optical fiber 11, the 2 nd optical fiber 12 and the 3 rd optical fiber 13 are tightly arranged in a square along the four quadrants of the XY axis, the 1 st optical fiber 11 is arranged in the fourth quadrant, the 2 nd optical fiber 12 is arranged in the third quadrant, the 3 rd optical fiber 13 is arranged in the first quadrant, the 1 st optical fiber 11 and the 3 rd optical fiber 13 are the high end of the optical fiber head, and the 2 nd optical fiber 12 is the low end of the optical fiber head;
the walk-off crystal 2 is YVO4, the thickness of the walk-off crystal is 0.2mm, the walk-off crystal is coaxially parallel to the optical fiber head 1 and is tightly attached to the inclined surface of the optical fiber head 1, the inclined angle between the optical axis of the walk-off crystal 2 and the normal line of the incident surface is 45 degrees, the main section of the crystal formed by the optical axis of the walk-off crystal 2 and the normal line of the incident surface is perpendicular to the plane formed by the 1 st optical fiber and the 3 rd optical fiber, o light and e light generated by double refraction of the walk-off crystal are separated by 0.02mm on the main section of the crystal, and the e light deviates towards the lower end of the optical fiber head;
λ 1 the input wave plate 3 is a 980nm 0-level quartz wave plate, and corresponds to the 1 st optical fiber 11 and the 3 rd optical fiber 13 to be closely attached to the walk-off crystal 2, lambda 1 The input wave plate 3 transmits lambda 1 Light beam, lambda 1 The included angle of the optical axis of the input wave plate 3 is 45 degrees;
λ 2 the input wave plate 4 is 1550nm 0-level quartz wave plate, and the 2 nd optical fiber 12 is closely attached to the walk-off crystal 2, lambda 2 The input wave plate 4 transmits lambda 2 Light beam, lambda 1 The included angle of the optical axis of the input wave plate 4 is 22.5 degrees;
the lens 5 is a G lens, one end of the lens is an inclined plane, the other end of the lens is a plane, the inclined plane is parallel to the optical fiber head 1 and is close to the walk-away crystal 2, AR films of 980nm and 1550nm are plated on the inclined plane, a WDM film is plated on the plane, and the WDM film reflects 980nm and transmits 1550 nm;
the two ends of the rotating sheet 6 are planes, AR films with 1550nm are plated on the planes, the polarization rotation angle of the rotating sheet 6 is 22.5 DEG, and the rotation direction is lambda 2 The rotation directions of the polarization of the input wave plate 4 are the same;
a wedge angle reflector 7, one end plane of which is close to the rotary piece 6 and is plated with 1550nm AR film, and the other end wedge angle plane of which is plated with 1550nm HR film;
wavelength lambda 1 The light beam is input by the 1 st optical fiber 11 or the 3 rd optical fiber 13 in the optical fiber head 1 and sequentially passes through the walk-off crystal 2, lambda 1 After the wave plate 3 and the lens 5 are input, the wave plate is reflected on a WDM film of the lens 5, and finally the wave plate is output from a 3 rd optical fiber 13 or a 1 st optical fiber 11 in the optical fiber head 1; lambda (lambda) 2 The light beam is input by the 2 nd optical fiber 12 in the optical fiber head 1 and passes through the walk-off crystal 2, lambda 2 After the wave plate 4, the lens 5, the rotary plate 6 and the wedge angle mirror 7 are input, the light is reflected on the wedge angle surface of the wedge angle mirror 7, and finally is output from the 3 rd optical fiber in the optical fiber head 1. But lambda is 2 The light beam is input by the 3 rd optical fiber in the optical fiber head and cannot be output from the 2 nd optical fiber in the optical fiber head. The above process realizes lambda 1 And lambda (lambda) 2 Wave division of (2)Multiplexing function and lambda 2 Is integrated with the reverse isolation function of (a).
Based on embodiment one, the insertion loss il=0.26 dB for a 980nm wavelength beam, the polarization dependent insertion loss pdl=0.04 dB; an insertion loss il=0.17 dB for a beam at 1550nm wavelength, a polarization dependent insertion loss pdl=0 dB; the extinction ratio of the rotator and the waveplate was not considered, and the isolation at normal temperature and a single wavelength 1550nm wavelength beam was iso=79 dB. The amount of positional displacement of the optical fiber head 1 and the lens 5 at this time was 0.036mm.
If the splitting plane formed by splitting the o-ray and e-ray generated by the birefringence of the walk-off crystal 2 on the main section of the crystal is parallel to the plane formed by the 1 st optical fiber 11 and the 2 nd optical fiber 12, the insertion loss PDL related to the polarization of the light beam with the wavelength of 0.02mm and 480 nm separated on the splitting plane becomes larger to 0.12dB.
If the direction of the optical axis away from the crystal 2 is changed so that the e-ray is deviated toward the upper end of the optical fiber head, the insertion loss IL and polarization-dependent insertion loss PDL of the 980nm wavelength beam and 1550nm wavelength beam are unchanged, but the isolation ISO at the 1550nm wavelength beam is reduced to 60dB, and the amount of positional misalignment of the optical fiber head 1 and the lens 5 is 0.056mm.
If the distribution of the inclined surface of the optical fiber head 1 is changed, the 1 st optical fiber 11 is arranged at the lower end and the 2 nd optical fiber 12 is arranged at the higher end, the optical path difference between the 980nm wavelength light beam and the 1550nm wavelength light beam is deteriorated, the insertion loss IL of the 980nm wavelength light beam is increased to 0.37dB, and the insertion loss IL of the 1550nm wavelength light beam is increased to 0.36dB.
If the G lens 5 is changed to the C lens, the PDL sensitivity with respect to the polarization-dependent insertion loss of the light beam having a wavelength of 1550nm is significantly improved. An important element in the 1550nm wavelength beam reflection path is the wedge angle mirror 7, which needs to be fixed by angle bonding after debugging. When the relative angular position at this position is changed, the insertion loss of the IL of the 1550nm wavelength beam is significantly degraded, accompanied by a significant degradation of the polarization-dependent insertion loss PDL of the 1550nm wavelength beam. Of course, in the optical path of the G lens 5, when the angle is changed by 0.05 °, the polarization-dependent insertion loss PDL of the light beam of 1550nm wavelength will deteriorate to 0.21dB; in the optical path of the C lens, when the angle is changed by 0.05 °, the polarization-dependent insertion loss of the light beam of the 1550nm PDL wavelength is deteriorated to 0.95dB.
In a further improvement of the first embodiment, an output wave plate 8 is added, and the output wave plate corresponds to the 3 rd optical fiber and is closely attached to the walk-off crystal 2; the optical path line is converted into the lambda 1 The light beam is input by the 1 st optical fiber 11 or the 3 rd optical fiber 13 in the optical fiber head and sequentially passes through the walk-off crystal 2, lambda 1 The input wave plate 3 and the rear lens 5 are reflected on the WDM film of the lens 5, and finally output from the 3 rd optical fiber 13 or the 1 st optical fiber 11 in the optical fiber head through the output wave plate 8; the lambda is 2 The light beam is input by the 2 nd optical fiber 12 in the optical fiber head and passes through the walk-off crystal 2, lambda 2 After the input wave plate 4, the lens 5, the rotary plate 6 and the wedge angle reflecting mirror 7, the light is reflected on the wedge angle surface of the wedge angle reflecting mirror 7, and finally is output from the 3 rd optical fiber 13 in the optical fiber head 1 through the output wave plate 8. The radius of a double light spot reaching the position after the light beams with 980nm wavelength and 1550nm wavelength are reflected is reduced by 0.003mm, so that the position pasting tolerance of the 0-level wave plate of the light beams with 980nm wavelength and 1550nm wavelength can be enlarged, and the process difficulty is reduced.
Referring to fig. 4 and 5, the second embodiment has the same structure as the first embodiment except that the optical fiber head is arranged in a straight line, where the optical fiber head in the second embodiment is arranged in a straight line, the 1 st optical fiber 11, the 3 rd optical fiber 13 and the 2 nd optical fiber 12 are sequentially and closely arranged along the X-axis direction, the 1 st optical fiber 11 is the high end of the optical fiber head 1, and the 2 nd optical fiber 12 is the low end of the optical fiber head 1.
Based on the second embodiment, the insertion loss il=0.08 dB of the 980nm wavelength light beam, and the polarization dependent insertion loss pdl=0.00 dB; the insertion loss il=0.26 dB for a beam at 1550nm wavelength, and the polarization dependent insertion loss pdl=0.03 dB.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. An integrated device with isolation and wavelength division multiplexing functions, characterized in that: it comprises an optical fiber head, a walk-off crystal and lambda arranged in sequence 1 Input wave plate lambda 2 An input wave plate, a lens, a rotating plate and a wedge angle reflecting mirror;
the optical fiber head establishes an XY axis along a plane perpendicular to the horizontal direction, and is obliquely arranged by taking the X axis as an axis, and comprises a 1 st optical fiber, a 2 nd optical fiber and a 3 rd optical fiber;
the walk-off crystal is coaxially parallel to the optical fiber head and is tightly attached to the inclined surface of the optical fiber head, the inclined angle between the optical axis of the walk-off crystal and the normal line of the incident surface is 45 degrees, and the main section of the crystal formed by the optical axis of the walk-off crystal and the normal line of the incident surface is perpendicular to the plane formed by the 1 st optical fiber and the 3 rd optical fiber;
λ 1 an input wave plate corresponding to the 1 st optical fiber and clung to the walk-off crystal, lambda 1 The input wave plate transmits lambda 1 A light beam;
λ 2 an input wave plate corresponding to the 2 nd optical fiber and clung to the walk-off crystal, lambda 2 The input wave plate transmits lambda 2 A light beam;
a lens with one end being an inclined plane and the other end being a plane, the inclined plane being parallel to the optical fiber head and being close to the walk-away crystal, the inclined plane being coated with lambda 1 Wavelength and lambda of the light beam 2 An AR film of the wavelength of the light beam, the plane being coated with a WDM film having a wavelength of lambda 1 Reflection of wavelength of light beam, for lambda 2 Transmission of the wavelength of the light beam;
the two ends of the rotary sheet are plane surfaces, and lambda is plated on the plane surfaces 2 AR film of wavelength of light beam, rotation angle of polarization of rotation plate is 22.5 DEG, rotation direction and lambda 2 The rotation directions of the polarization of the input wave plate are the same;
wedge angle reflector with one end plane near the rotating plate and the other end wedge angle surface with lambda plated 2 An AR film of the wavelength of the light beam, the wedge angle surface being coated with lambda 2 HR film of wavelength of the light beam;
the lambda is 1 Of light beamsWavelength less than lambda 2 The wavelength of the light beam; lambda (lambda) 1 The light beam is input by the 1 st optical fiber or the 3 rd optical fiber in the optical fiber head and sequentially passes through the walk-off crystal and lambda 1 After the wave plate and the lens are input, the wave plate and the lens are reflected on a WDM film of the lens, and finally the wave plate and the lens are output from a 3 rd optical fiber or a 1 st optical fiber in the optical fiber head; the lambda is 2 The light beam is input by the 2 nd optical fiber in the optical fiber head and passes through the walk-off crystal lambda 2 After the wave plate, the lens, the rotary piece and the wedge angle reflector are input, the reflection is carried out on the wedge angle surface of the wedge angle reflector, and finally the reflection is output from the 3 rd optical fiber in the optical fiber head.
2. An integrated device with isolation and wavelength division multiplexing functions, characterized in that: it comprises an optical fiber head, a walk-off crystal and lambda arranged in sequence 1 Input wave plate lambda 2 The optical element comprises an input wave plate, an output wave plate, a lens, a rotary plate and a wedge angle reflecting mirror;
the optical fiber head establishes an XY axis along a plane perpendicular to the horizontal direction, and is obliquely arranged by taking the X axis as an axis, and comprises a 1 st optical fiber, a 2 nd optical fiber and a 3 rd optical fiber;
the walk-off crystal is coaxially parallel to the optical fiber head and is tightly attached to the inclined surface of the optical fiber head, the inclined angle between the optical axis of the walk-off crystal and the normal line of the incident surface is 45 degrees, and the main section of the crystal formed by the optical axis of the walk-off crystal and the normal line of the incident surface is perpendicular to the plane formed by the 1 st optical fiber and the 3 rd optical fiber;
λ 1 an input wave plate corresponding to the 1 st optical fiber and clung to the walk-off crystal, lambda 1 The input wave plate transmits lambda 1 A light beam;
λ 2 an input wave plate corresponding to the 2 nd optical fiber and clung to the walk-off crystal, lambda 2 The input wave plate transmits lambda 2 A light beam;
an output wave plate, which is closely attached to the walk-off crystal corresponding to the 3 rd optical fiber;
a lens with one end being an inclined plane and the other end being a plane, the inclined plane being parallel to the optical fiber head and being close to the walk-away crystal, the inclined plane being coated with lambda 1 Wavelength and lambda of the light beam 2 An AR film of the wavelength of the light beam, the plane being coated with a WDM film having a wavelength of lambda 1 Reflection of the wavelength of the light beamλ 2 Transmission of the wavelength of the light beam;
the two ends of the rotary sheet are plane surfaces, and lambda is plated on the plane surfaces 2 AR film of wavelength of light beam, rotation angle of polarization of rotation plate is 22.5 DEG, rotation direction and lambda 2 The rotation directions of the polarization of the input wave plate are the same;
wedge angle reflector with one end plane near the rotating plate and the other end wedge angle surface with lambda plated 2 An AR film of the wavelength of the light beam, the wedge angle surface being coated with lambda 2 HR film of wavelength of the light beam;
the lambda is 1 The wavelength of the light beam is less than lambda 2 The wavelength of the light beam; the lambda is 1 The light beam is input by the 1 st optical fiber or the 3 rd optical fiber in the optical fiber head and sequentially passes through the walk-off crystal and lambda 1 After the wave plate and the lens are input, the wave plate and the lens are reflected on a WDM film of the lens, and finally the wave plate is output from a 3 rd optical fiber or a 1 st optical fiber in the optical fiber head; the lambda is 2 The light beam is input by the 2 nd optical fiber in the optical fiber head and passes through the walk-off crystal lambda 2 After the wave plate, the lens, the rotary piece and the wedge angle reflector are input, the reflection is carried out on the wedge angle surface of the wedge angle reflector, and finally the reflection is output from the 3 rd optical fiber in the optical fiber head through the output wave plate.
3. An integrated device with isolation and wavelength division multiplexing functions according to claim 1 or 2, characterized in that: the inclination angle of the optical fiber head taking the X axis as an inclination is 8 degrees.
4. An integrated device with isolation and wavelength division multiplexing functions according to claim 1 or 2, characterized in that: the optical fibers 1, 2 and 3 are closely arranged along the four quadrants of the XY axis, the optical fibers 1 are arranged in the fourth quadrant, the optical fibers 2 are arranged in the third quadrant, the optical fibers 3 are arranged in the first quadrant, the optical fibers 1 and 3 are the high end of the optical fiber head, and the optical fibers 2 are the low end of the optical fiber head.
5. An integrated device with isolation and wavelength division multiplexing functions according to claim 1 or 2, characterized in that: the 1 st optical fiber, the 3 rd optical fiber and the 2 nd optical fiber are sequentially and tightly arranged along the X-axis direction, the 1 st optical fiber is the high end of the optical fiber head, and the 2 nd optical fiber is the low end of the optical fiber head.
6. An integrated device with isolation and wavelength division multiplexing functions according to claim 1 or 2, characterized in that: the main section of the crystal is perpendicular to the plane formed by the 1 st optical fiber and the 3 rd optical fiber, and o light and e light generated by double refraction of the walk-away crystal are separated on the main section of the crystal.
7. An integrated device with isolation and wavelength division multiplexing functions according to claim 1 or 2, characterized in that: the walk-off crystal is YVO4, and the thickness of the walk-off crystal is 0.2mm.
8. An integrated device with isolation and wavelength division multiplexing functions according to claim 1 or 2, characterized in that: the lambda is 1 Input waveplate lambda 2 The input wave plate is a 0-level quartz wave plate.
9. An integrated device with isolation and wavelength division multiplexing functions according to claim 1 or 2, characterized in that: the lens is a C lens or a G lens.
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| CN113805279B true CN113805279B (en) | 2023-11-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6310989B1 (en) * | 1998-02-23 | 2001-10-30 | Zhimin Liu | Fiber optical circulator |
| US9485046B1 (en) * | 2013-04-12 | 2016-11-01 | Alliance Fiber Optic Products, Inc. | Optical spot array pitch compressor |
| CN208607385U (en) * | 2018-07-18 | 2019-03-15 | 福州高意通讯有限公司 | A kind of high isolation wavelength-division multiplexer of integrated TAP-PD |
| CN209858779U (en) * | 2019-06-20 | 2019-12-27 | 福州高意光学有限公司 | Miniaturized wavelength-division multiplexing light receiving assembly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8867016B2 (en) * | 2012-03-12 | 2014-10-21 | Oplink Communications, Inc. | Wavelength selective switch |
-
2021
- 2021-09-29 CN CN202111153959.5A patent/CN113805279B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6310989B1 (en) * | 1998-02-23 | 2001-10-30 | Zhimin Liu | Fiber optical circulator |
| US9485046B1 (en) * | 2013-04-12 | 2016-11-01 | Alliance Fiber Optic Products, Inc. | Optical spot array pitch compressor |
| CN208607385U (en) * | 2018-07-18 | 2019-03-15 | 福州高意通讯有限公司 | A kind of high isolation wavelength-division multiplexer of integrated TAP-PD |
| CN209858779U (en) * | 2019-06-20 | 2019-12-27 | 福州高意光学有限公司 | Miniaturized wavelength-division multiplexing light receiving assembly |
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| CN113805279A (en) | 2021-12-17 |
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