CN208984906U - A kind of integrated free space optical circulator - Google Patents
A kind of integrated free space optical circulator Download PDFInfo
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- CN208984906U CN208984906U CN201820632794.7U CN201820632794U CN208984906U CN 208984906 U CN208984906 U CN 208984906U CN 201820632794 U CN201820632794 U CN 201820632794U CN 208984906 U CN208984906 U CN 208984906U
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- polarization
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- free space
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- nonreciprocity
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Abstract
The utility model discloses a kind of integrated free space optical circulators, including the first polarization spectro component, nonreciprocity polarization rotator, half-wave plate and the second polarization spectro component being set in sequence along optical path, become one between first polarization spectro component, nonreciprocity polarization rotator, half-wave plate and the second polarization spectro component by glued or in-depth optical cement or optical cement technique, there are three ports for the free space optical circulator, it is transmitting terminal, receiving end and common end respectively, wherein transmitting terminal and receiving end are in the same side, and common end is in other side；The utility model has that small in size, structure is integrated, easy processing and volume production, at low cost and high reliability.
Description
Technical field
The utility model relates to optical communication device field, especially a kind of integrated free space optical circulator.
Background technique
Optical circulator is a kind of nonreciprocity optical passive component of multiport input and output, its effect is to make optical signal
It can only be transmitted along defined port order, when the change of the transmission sequence of optical signal, loss is very big, therefore can realize signal
Isolation.Typical structure has N (N is more than or equal to 3) a port, and as shown in Figure of description 1, when light is inputted by port 1, light is by holding
Mouth 2 exports, and when light is inputted by port 2, light is exported by port 3, and so on.
The characteristics of non-reciprocity of optical circulator is realized using the Faraday effect of magneto-optic memory technique.Faraday effect refers to
Under the magnetic fields for being parallel to optical propagation direction, the plane of polarization of the electromagnetic wave (light wave) in dielectric material generates showing for rotation
As, and its direction of rotation and the direction of propagation of light are unrelated, that is, polarize unrelated.Light wave becomes polarization after the first polarizer
Light, after which passes through Faraday polarization apparatus, polarization direction rotates 45 °, permission parallel with the second polarizer optical direction
Pass through；When the transmission of light opposite direction, after Faraday polarization apparatus, the polarization direction of light is vertical with the first polarizing film optical direction,
It cannot pass through.
Due to the characteristics of non-reciprocity and sequential delivery characteristic of optical circulator, it can be used for transmission positive in same root optical fiber
Separate, be widely used among fiber optic communication, Fibre Optical Sensor and optical fiber testing system with the optical signal of reverse transfer, make be
Structure of uniting simplifies, and performance improves.Main correlation concrete application includes: single fiber bi-directional communication, fiber bragg grating (FBG) combination
Using, erbium-doped fiber amplifier (EDFA), wavelength-division multiplex (WDM), dispersion compensation, optical signal upload/download, it may also be used for optics
Coupler is made in time-domain reflectomer (OTDR) and optical fibre gyro.
In optical circulator development, low cost is pursued, the structure of small integrated is Main Trends of The Development in recent years.
Summary of the invention
The case where for the prior art, the purpose of this utility model is to provide the collection of a kind of low cost, small integrated
At change free space optical circulator.
In order to realize above-mentioned technical purpose, the technical solution adopted in the utility model are as follows:
A kind of integrated free space optical circulator comprising the first polarization spectro component for being set in sequence along optical path, non-
Reciprocity polarization rotator, half-wave plate and the second polarization spectro component, the first polarization spectro component, nonreciprocity polarization
Rotator, half-wave plate and the second polarization spectro component are fixed to each other and are combined as a whole.
Further, the first polarization spectro component, nonreciprocity polarization rotator, half-wave plate and second polarization spectro
It is integrated between component by glued or in-depth optical cement or optical cement secure bond.
Further, the first polarization spectro component be two 45 ° of right-angle prisms with 45 ° of rhombic prism gluing or
Deepen optical cement or optical cement is integral, on the inclined-plane of described two 45 ° of right-angle prisms or on two inclined-planes of 45 ° of rhombic prisms
Plating is equipped with PBS film.
Preferably, the first polarization spectro component is equipped with anti-reflection film far from the side plating of nonreciprocity polarization rotator.
Wherein, the first polarization spectro component can be PBS (Polarization Beam as a preferred implementation manner,
Splitter, polarization beam apparatus) cuboid or parallelepiped sub-assembly, the sub-assembly is using glued or in-depth optical cement or light
The technique of glue is integrated with two PBS, and polarization spectro, light combination function may be implemented.
Further, the second polarization spectro component be two 45 ° of right-angle prisms with 45 ° of rhombic prism gluing or
Deepen optical cement or optical cement is integral, is plated on the inclined-plane of described two 45 ° of right-angle prisms or on two inclined-planes of 45 ° of rhombic prisms
Equipped with PBS film.
Preferably, the second polarization spectro component is equipped with anti-reflection film far from the side plating of nonreciprocity polarization rotator.
Wherein, the second polarization spectro component can be PBS cuboid or parallelepiped as a preferred implementation manner,
Sub-assembly, the sub-assembly are integrated with two PBS using the technique of glued or in-depth optical cement or optical cement, may be implemented polarization spectro,
Light combination function.
Preferably, the refractive index of glue used in the gluing is adapted with the refractive index of corresponding faying face, and the glue is extremely
It less include UV solidification glue or heat-curable glue or double solidification glues.
Further, the nonreciprocity polarization rotator is Faraday rotation piece comprising included magnetic Faraday rotation
Piece or non-included magnetic faraday revolving fragment.
Further, the half-wave plate is that monolithic half-wave plate or multi-disc combine half-wave plate, the optical axis of the half-wave plate and the
22.5 ° of angles that one polarization spectro component and/or the second polarization spectro component are formed.
There are three ports in the utility model design scheme as a preferred implementation manner, are transmitting terminal respectively, receive
End and common end, wherein transmitting terminal and receiving end are in the same side, and common end is in other side；Three ports constitute two light
Road is the first optical path and the second optical path respectively；In the first optical path, input optical signal passes through the first polarization spectro group by transmitting terminal
Part, nonreciprocity polarization rotator, half-wave plate and the second polarization spectro component reach common end output；It is defeated in the second optical path
Optical signal passes through the second polarization spectro component, nonreciprocity polarization rotator, half-wave plate and the first polarization spectro by common end
Component reaches receiving end output.
Further, the first polarization spectro component and/or the second polarization spectro component are far from nonreciprocity rotator
Glued or in-depth optical cement or optical cement have an angle of wedge piece on end face.
It can in order to promote circulator return loss (RL) performance as the further supplement of the utility model design scheme
The integrally-built plane of incidence and bottom surface to be processed into the relationship of non-90 degree.
Using above-mentioned technical solution, compared with prior art, the utility model by using less optical module,
And it is integrated between optical module using glued or in-depth optical cement or optical cement technique, therefore there is small in size, structure to integrate
Change, easy processing and volume production, at low cost and high reliability.
Detailed description of the invention
The utility model is further elaborated with reference to the accompanying drawings and detailed description:
Fig. 1 is the schematic diagram of three ports light rings；
Fig. 2 is the schematic diagram of four ports light rings；
Fig. 3 is the schematic perspective view of the utility model embodiment 1；
Fig. 4 is the light path schematic diagram for implementing structure shown in Fig. 3；
Fig. 5 is the other side viewing angle constructions schematic diagram for implementing structure shown in Fig. 3；
Fig. 6 is the schematic perspective view of the utility model embodiment 2；
Fig. 7 is the light path schematic diagram for implementing structure shown in Fig. 6；
Fig. 8 is the other side viewing angle constructions schematic diagram for implementing structure shown in Fig. 6；
Fig. 9 is the light path schematic diagram that the utility model embodiment 3 implements structure；
Figure 10 is the other side viewing angle constructions schematic diagram for implementing structure shown in Fig. 9.
Specific embodiment
Embodiment 1
As shown in Fig. 3 to one of 5, it illustrates the implementation structures of the utility model embodiment 1 comprising sequentially along optical path
103,45 ° of Faraday rotation pieces 104 of the first polarization spectro component, half-wave plate 105 and the second polarization spectro component 108 being arranged,
First polarization spectro component, 103,45 ° of Faraday rotation pieces 104, half-wave plate 105 and the second polarization spectro component 108 it
Between be integrated by glued or in-depth optical cement or optical cement secure bond, when to be glued, it is glued used in glue refractive index with it is right
The refractive index of faying face is answered to be adapted, the glue includes at least UV solidification glue or heat-curable glue or double solidification glues.
Wherein, the first polarization spectro component 103 is two 45 ° of right-angle prisms and 45 ° of rhombic prism gluings
In-depth optical cement or optical cement it is integral, on the inclined-plane of described two 45 ° of right-angle prisms or two inclined-planes of 45 ° of rhombic prisms
Upper plating is equipped with PBS film 101,102, it is preferred that the first polarization spectro component 103 far from 45 ° of Faraday rotation pieces 104 one
Side plating is equipped with anti-reflection film.
Further, the second polarization spectro component 108 is two 45 ° of right-angle prisms and 45 ° of rhombic prism glue
Conjunction or in-depth optical cement or optical cement are integral, on the inclined-plane of described two 45 ° of right-angle prisms or two inclined-planes of 45 ° of rhombic prisms
Upper plating is equipped with PBS film 106,107, it is preferred that the second polarization spectro component 108 far from 45 ° of Faraday rotation pieces 104 one
Side plating is equipped with anti-reflection film.
Further, the half-wave plate 105 is that monolithic half-wave plate or multi-disc combine half-wave plate, the light of the half-wave plate 105
22.5 ° of angles that axis and the first polarization spectro component 103 and/or the second polarization spectro component 108 are formed.
Referring to fig. 4, the working principle of structure shown in the present embodiment are as follows:
The present embodiment structure forms three ports and it constitute two optical paths, is the first optical path and the second light respectively
Road.
In the first optical path, input optical signal is by port 1(transmitting terminal, usually LD collimated light) pass through the first spectrum groupware
It is separated into the mutually perpendicular two-beam of polarization state after 103 upper PBS 101, without loss of generality, claims respectively perpendicular to the inclined of paper
Vibration light is S light and to be parallel to paper polarised light be P light, and usual S light is weaker and is reflected, and the continuation of P light is transmitted and passed through forward
45 ° of Faraday rotation pieces 104 are crossed, along the direction of light propagation, the polarization direction of light is rotated counterclockwise 45 °, with half-wave plate 105
Optical axis included angle be 22.5 °, after half-wave plate 105, along the direction of light propagation, the polarization direction of light is rotated clockwise
45 °, become P light again, after the PBS 106 of the second polarization spectro component 108, the output of arrival port 2 (common end, usually
For single mode fiber collimator).
In the second optical path, input optical signal is by being separated into S after upper PBS 106 of the port 2 via the second spectrum groupware 108
Light and P light, in which: for S light, via the upper PBS 106 of the second spectrum groupware 108, light turns to 90 ° by reflection, then enters
It is mapped on PBS 107, then turns to 90 ° by reflection again, it is then incident to enter half-wave plate 105, half-wave plate optical axis and S polarized light
At 67.5 ° of angles, after half-wave plate, along the direction of propagation, the polarization direction of light is compared former polarization direction and is turned counterclockwise
135 °, subsequently into 45 ° of Faraday rotation pieces 104, after 104, the polarization direction of light is rotated clockwise 45 ° again, finally
Former incoming polarization state becomes P light from S light, subsequently into PBS 102 and completely through, eventually arrive at the 3rd port output (receive
It holds, usually detector).For P light, via the upper PBS 106 of the second spectrum groupware 108, then light is by completely through entering
It injects into half-wave plate 105, half-wave plate optical axis and P-polarized light are at 22.5 °, after half-wave plate, along the direction of propagation, the polarization of light
Direction compares former polarization direction and has turned 45 ° clockwise, subsequently into 45 ° of Faraday rotation pieces 104, after 104, the polarization of light
Direction is rotated clockwise 45 ° again, and final original incident light polarization state becomes S light from P light, is then incident on PBS 101, is passed through
The reflection of PBS 101 turns to 90 °, is then again incident on PBS 102, reflect 90 ° of steering again by PBS 102, final with second
The P light of optical path, which is realized, closes beam, and the common port 3 that reaches exports.
Since the first polarization spectro component 103 and the second polarization spectro component 108 can be made into ruler with batch in processing
The very high elongate strip of very little longer and angle precision, likewise, 45 ° of Faraday rotation pieces 104 and half-wave plate 105 can also be processed
At the strip that length is optimal, the corresponding strip in 103,104,105 and 108 is aligned, needs not move through complicated debugging and right
Then position is integrated using glued or in-depth optical cement or the assembling of optical cement technique, strip is finally cut into multiple finished products again,
This can substantially reduce the expense of processing and assembly.
Further, since the size of the free space optical circulator after integrated can accomplish very small, this helps substantially to drop
The Material Cost of low circulator.
Finally, in the optical circulator aspect of performance of the utility model, due to used glued or in-depth optical cement or optical cement dress
The index matching between different interfaces has been fully taken into account with technique, has assembled and easily realizes high-precision, while the extinction ratio of PBS film
It can also accomplish very high, device has very good performance, can accomplish the positive insertion loss of very little and very high reverse
Isolation.
Wherein, further, the Faraday rotation piece includes included magnetic faraday revolving fragment or non-included magnetic faraday
Revolving fragment.
Embodiment 2
As shown in Fig. 6 to one of 8, it illustrates the implementation structure of the utility model embodiment 2, the present embodiment and embodiment
1 structure is roughly the same (reference of corresponding label is same parts), the difference is that the first polarization spectro group
Glued or in-depth optical cement or optical cement on part 103 and the second end face of the polarization spectro component 108 far from 45 ° of Faraday rotation pieces 104
There is an angle of wedge piece 201,202, the angle of wedge face between two angle of wedge pieces 201,202 is parallel to each other.
After increasing angle of wedge piece 201,202, by adjusting suitable incident angle, device other performances are not being influenced
In the case of, the reflected light caused by the plane of incidence can be made to be reflected off former input path, and then increase the echo of device
Reflection loss is conducive to the stability for improving transmitting terminal light source.
The working principle of the present embodiment is same as Example 1, and index path is as shown in Fig. 7, and details are not described herein.
Embodiment 3
As illustrated in fig. 9 or 10, it illustrates the implementation structure of the utility model embodiment 3, the present embodiment and embodiments 1
Structure is roughly the same (reference of corresponding label is same parts), and the present embodiment is on the basis of embodiment 1, by whole knot
The plane of incidence of structure is processed into the non-90 degree face with low-angle relative to bottom surface or side；At this point it is possible to suitable by adjusting
Incident angle can make the reflected light caused by the plane of incidence inclined by reflection in the case where not influencing other performances of device
From former input path, and then achieve the purpose that increase return loss.
Likewise, the working principle of the present embodiment is same as Example 1, index path is as shown in Figure 10, also no longer superfluous herein
It states.
Although specifically showing and describing the utility model in conjunction with preferred embodiment, those skilled in the art is answered
This is clear, in the spirit and scope for not departing from the utility model as defined in the appended claims, in the form and details
It is the protection scope of the utility model to the various change that the utility model is made.
Claims (10)
1. a kind of integrated free space optical circulator, it is characterised in that: it includes the first polarization point being set in sequence along optical path
Optical assembly, nonreciprocity polarization rotator, half-wave plate and the second polarization spectro component, it is the first polarization spectro component, non-
Reciprocity polarization rotator, half-wave plate and the second polarization spectro component are fixed to each other and are combined as a whole.
2. a kind of integrated free space optical circulator according to claim 1, it is characterised in that: first polarization
Between spectrum groupware, nonreciprocity polarization rotator, half-wave plate and the second polarization spectro component by glued or in-depth optical cement or
Optical cement secure bond is integrated.
3. a kind of integrated free space optical circulator according to claim 1, it is characterised in that: described first is partially
Spectrum groupware of shaking is that two 45 ° of right-angle prisms and 45 ° of rhombic prisms gluing or in-depth optical cement or optical cement are integral, described
It plates on the inclined-plane of two 45 ° of right-angle prisms or on two inclined-planes of 45 ° of rhombic prisms and is equipped with PBS film.
4. a kind of integrated free space optical circulator according to claim 3, it is characterised in that: first polarization point
Optical assembly is equipped with anti-reflection film far from the side plating of nonreciprocity polarization rotator.
5. a kind of integrated free space optical circulator according to claim 1, it is characterised in that: second polarization
Spectrum groupware is that two 45 ° of right-angle prisms and 45 ° of rhombic prisms gluing or in-depth optical cement or optical cement are integral, described two
It plates on the inclined-plane of 45 ° of right-angle prisms or on two inclined-planes of 45 ° of rhombic prisms and is equipped with PBS film.
6. a kind of integrated free space optical circulator according to claim 5, it is characterised in that: second polarization point
Optical assembly is equipped with anti-reflection film far from the side plating of nonreciprocity polarization rotator.
7. a kind of integrated free space optical circulator according to claim 3 or 5, it is characterised in that: the gluing institute
The refractive index of glue and the refractive index of corresponding faying face are adapted, the glue include at least UV solidification glue or heat-curable glue or
Double solidification glues.
8. a kind of integrated free space optical circulator according to claim 1, it is characterised in that: the nonreciprocity
Polarization rotator is Faraday rotation piece.
9. a kind of integrated free space optical circulator according to claim 1, it is characterised in that: the half-wave plate is
Monolithic half-wave plate or multi-disc combine half-wave plate, the optical axis of the half-wave plate and the first polarization spectro component and/or the second polarization point
22.5 ° of angles that optical assembly is formed.
10. a kind of integrated free space optical circulator according to claim 1, it is characterised in that: first polarization
Glued or in-depth optical cement or optical cement have in spectrum groupware and/or the second end face of the polarization spectro component far from nonreciprocity rotator
One angle of wedge piece.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820632794.7U CN208984906U (en) | 2018-04-28 | 2018-04-28 | A kind of integrated free space optical circulator |
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| CN201820632794.7U CN208984906U (en) | 2018-04-28 | 2018-04-28 | A kind of integrated free space optical circulator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412780A (en) * | 2018-04-28 | 2019-11-05 | 福州高意光学有限公司 | An Integrated Free Space Optical Circulator |
| CN112147741A (en) * | 2019-06-28 | 2020-12-29 | 福州高意光学有限公司 | Miniaturized three-port optical ring device with standard optical interface |
-
2018
- 2018-04-28 CN CN201820632794.7U patent/CN208984906U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412780A (en) * | 2018-04-28 | 2019-11-05 | 福州高意光学有限公司 | An Integrated Free Space Optical Circulator |
| CN110412780B (en) * | 2018-04-28 | 2025-01-03 | 福州高意光学有限公司 | An integrated free-space optical circulator |
| CN112147741A (en) * | 2019-06-28 | 2020-12-29 | 福州高意光学有限公司 | Miniaturized three-port optical ring device with standard optical interface |
| WO2020259239A1 (en) * | 2019-06-28 | 2020-12-30 | 福州高意光学有限公司 | Miniaturized three-port optical circulator with standard optical interface |
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