CN110261959A - A kind of terahertz polarization beam splitter of bielliptic(al) core structure optical-fiber type - Google Patents
A kind of terahertz polarization beam splitter of bielliptic(al) core structure optical-fiber type Download PDFInfo
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- CN110261959A CN110261959A CN201910565406.7A CN201910565406A CN110261959A CN 110261959 A CN110261959 A CN 110261959A CN 201910565406 A CN201910565406 A CN 201910565406A CN 110261959 A CN110261959 A CN 110261959A
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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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/126—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind using polarisation effects
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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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B2006/12133—Functions
- G02B2006/1215—Splitter
Abstract
The invention discloses a kind of terahertz polarization beam splitters of bielliptic(al) core structure optical-fiber type, including two elliptical cores, two parallel thin-walleds and a hollow polymeric property management.Two identical elliptical cores are supported by two parallel thin-wall constructions, and two identical elliptical cores are symmetrically distributed on two thin-walleds of hollow polymeric property management, and hollow polymeric property management plays the role of protecting the bielliptic(al) fibre core of inside of optical fibre.Elliptical core size is less than transmission wavelength, and most of fiber core guided mode energy can transmit in the air of surrounding, has compressed the absorption loss of polymer material.In addition, this elliptical core adds the structure of hollow polymeric property management that effectively fiber core guided mode can be isolated with external environment, fiber core guided mode is avoided to be affected by, the present invention is in THz communication technology, for realizing the Hz optical fiber function element of information processing, the polarization beam apparatus of structure of the invention obtains practical application in narrow band terahertz band Transmission system, has transmission mould field not vulnerable to external disturbance, the small advantage of device loss.
Description
Technical field
The present invention relates to optical communication field, especially a kind of terahertz polarization beam splitting of bielliptic(al) core structure optical-fiber type
Device.
Background technique
Terahertz emission refers to one section electromagnetic wave of the frequency range between 0.1~10 THz, its wavelength is in 3 mm
~3 μ ms.In electromagnetic spectrum, THz wave is between microwave and far infrared radiation.Since THz wave is in electromagnetic wave
Position is special in spectrum, superior performance, and Terahertz Technology is in research fields such as electronics, information, communication, life, space flight, national security
All there is important learning value and huge application prospect.The deep development of Terahertz Technology proposes collection to Terahertz system
At the new demand changed and minimized, while the function element for researching and developing controllable THz wave is also wanting substantially for Terahertz application
It asks, in particular with the development of Terahertz communication, has more to the various Hz optical fiber function elements of achievable information processing
Urgent demand.
Since high-selenium corn of most of materials to THz wave is lost, the design of Hz optical fiber function element needs to consider
Two o'clock: transmission loss and bandwidth of operation.[Li S, Zhang H, Hou Y, the et al. Terahertz such as Li Shanshan
polarization splitter based on orthogonal microstructure dual-core photonic
Crystal fiber [J] Applied optics, 2013,52 (14): 3305-3310] one kind is proposed based on porous
The polarization beam apparatus of twin-core PCF structure, it is orthogonal to realize two by adjusting the structure and parameter of the porous fibre core of high birefringence
The asymmetric coupling of polarization state, the polarization beam apparatus have shorter separation length (1.83 cm), lower device loss
(0.34 dB) and wider operating frequency range (0.15 THz).However, the airport in the polarization beam apparatus twin-core and covering
Quantity up to 173, and photon crystal structure is complicated, and technique realization is difficult.Subsequently, based on identical polarization beam splitting machine
Reason, [Li S, Zhang H, Bai J, the et al. Dual-porous fiber-based low loss such as Li Shanshan
broadband terahertz polarization splitter[J]. IEEE Photonics Technology
Letters, 2014,26 (14): 1399-1402] have also been proposed the relatively simple polarization beam apparatus of structure [66].The device
By two close to porous optical fiber structure composition, realize to polarization beam splitting properties General Promotion: shorter separation length
(0.61 cm), lower device loss (0.11 dB) and wider operating frequency range (0.9~2.2 THz).However, the polarization
For beam splitter using air as covering, twin-core structure lacks support and protection structure, in twin-core transmission mould field easily by external disturbance,
Inconvenience is brought for device practical operation.
A kind of diesis medium strip structured optical fiber type terahertz polarization beam splitter is disclosed in patent CN103645541A.
Although the device architecture is relatively simple, polarization beam apparatus length is longer, causes device loss also larger (~3 dB), affects
The practical application of device.
Summary of the invention
The purpose of the present invention is in view of the deficiencies of the prior art and provide a kind of bielliptic(al) core structure optical-fiber type too
Hertz polarization beam apparatus, the present invention are hollow pipe using strip tube-like piece made of polymer, section, and hollow inside pipe wall is along axis
To be equipped with two panels it is parallel with the symmetrical thin-walled of tube hub, the end of two thin-walleds connect with hollow inside pipe wall, the middle part of two thin-walleds
It is supported by elliptical fibre core respectively；Play the role of protecting the double-fiber core of inside of optical fibre by hollow pipe diameter, and in two fibre cores
Between along the direction of ellipse short shaft be equipped with gap gap；The present invention is in THz communication technology, too for realizing information processing
Hertz fiber functions device, the polarization beam apparatus of structure of the invention obtain practical application in narrow band terahertz band Transmission system, have
There is transmission mould field not vulnerable to external disturbance, the small advantage of device loss.
Realizing the specific technical solution of the object of the invention is:
A kind of terahertz polarization beam splitter of bielliptic(al) core structure optical-fiber type, it is characterized in that, which is polymer system
At strip tube-like piece, section is hollow pipe, and hollow inside pipe wall is along being axially arranged with parallel symmetrically thin with tube hub of two panels
Wall, the end of two thin-walleds are connect with hollow inside pipe wall, and the middle part of two thin-walleds is supported by elliptical first fibre core and the second fibre respectively
Core；
The both ends of transverse are connect with thin-walled on first fibre core and the second fibre core, edge between the first fibre core and the second fibre core
The direction of ellipse short shaft is equipped with gap gap；And gap are as follows: 100 μm≤gap≤300 μm；
First fibre core and the elliptical minor axis diameter a of the second fibre core are quantitative, and a=200 μm；Major diameter b is variable；Institute
State ellipticity are as follows: e=b/a；And 1.4≤e≤1.6；
The thickness s of the thin-walled are as follows: s=25 μm；
The outer diameter D and thickness of pipe wall t of the hollow pipe are respectively as follows: D=4 mm, t=300 μm.
For the present invention using strip tube-like piece made of polymer, section is hollow pipe, and hollow inside pipe wall edge is axially arranged with
Two panels it is parallel with the symmetrical thin-walled of tube hub, the end of two thin-walleds connect with hollow inside pipe wall, and the middle part of two thin-walleds is propped up respectively
Support has elliptical first fibre core and the second fibre core；Play the role of protecting the double-fiber core of inside of optical fibre by hollow pipe diameter, and
Gap gap is equipped with along the direction of ellipse short shaft between the first fibre core and the second fibre core；The present invention be THz communication technology in,
For realizing the Hz optical fiber function element of information processing, the polarization beam apparatus of structure of the invention is transmitted in narrow band terahertz band is
Practical application is obtained in system, has transmission mould field not vulnerable to external disturbance, the small advantage of device loss.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the distribution map of the electric field under four transmission super model states of the invention；
Fig. 3 is the normalized power of x of the present invention and y-polarisation mould and the curve graph of transmission range；
Fig. 4 is the distribution map of the electric field of x of the present invention and y-polarisation mould in different conveying lengths；
Fig. 5 is the curve graph of coupling length, separation length and fibre core gap the gap variation of x of the present invention and y-polarisation mould；
Fig. 6 is the absorption loss of x of the present invention and y-polarisation mould and the curve graph of fibre core gap gap variation；
Fig. 7 is the curve graph of coupling length, separation length and fibre core the ellipticity variation of x of the present invention and y-polarisation mould；
Fig. 8 is the absorption loss of x of the present invention and y-polarisation mould and the curve graph of fibre core ellipticity variation；
Fig. 9 is the extinction ratio of x of the present invention and y-polarisation mould and the curve graph of frequency variation；
Figure 10 is the connection schematic diagram of the present invention with Terahertz Transmission system.
Specific embodiment
Refering to fig. 1, beam splitter of the present invention is strip tube-like piece made of polymer, and section is hollow pipe 4, hollow pipe 4
Inner wall along be axially arranged with two panels it is parallel with the symmetrical thin-walled 3 of tube hub, the end of two thin-walleds 3 connect with 4 inner wall of hollow pipe, two
The middle part of thin-walled 3 is supported by elliptical first fibre core 1 and the second fibre core 2 respectively；
The both ends of transverse are connect with thin-walled 3 on first fibre core 1 and the second fibre core 2, the first fibre core 1 and the second fibre core 2
Between along the direction of ellipse short shaft be equipped with gap gap；And gap are as follows: 100 μm≤gap≤300 μm；
First fibre core 1 and the elliptical minor axis diameter a of the second fibre core 2 are quantitative, and a=200 μm；Major diameter b is variable；
The ellipticity are as follows: e=b/a；And 1.4≤e≤1.6；
The thickness s of the thin-walled 3 are as follows: s=25 μm；
The outer diameter D and thickness of pipe wall t of the hollow pipe 4 are respectively as follows: D=4 mm, t=300 μm.
The polymer material is Topas cyclic olefine copolymer.
The present invention works in this way
The present invention uses strip tube-like piece, and section is hollow pipe 4, hollow pipe 4 inner wall along be axially arranged with two panels it is parallel with pipe
The end of centrosymmetric thin-walled 3, two thin-walleds 3 is connect with 4 inner wall of hollow pipe, and the middle part of two thin-walleds 3 is supported by elliptical respectively
First fibre core 1 and the second fibre core 2；First fibre core 1 and the elliptical minor axis diameter a of the second fibre core 2 are quantitative, and a=200 μm；It is long
Shaft diameter b is variable；The ellipticity are as follows: e=b/a；And 1.4≤e≤1.6；Due to the short axle of the first fibre core 1 and the second fibre core 2
Diameter a and major diameter b is respectively less than transmission wavelength, and most of fiber core guided mode energy can pass in the air around hollow pipe 4
It is defeated, drastically reduce the absorption loss of Inventive polymers material.
X(y in 2 optical fiber of first fibre core 1 and the second fibre core through the invention) polarize even mould and Qi Mo interaction, Ke Yirang
X(y) polarization mode couples between the first fibre core 1 and the second fibre core 2, i.e. x(y) energy of polarization mode occurs in two fibre cores
Cyclically-varying.Due to the high birefringence characteristic of the ellipsoidal structure and two fibre cores of the first fibre core 1 and the second fibre core 2, x and y
The coupling length of polarization is different, thus two orthogonal polarization states can be realized by a specific fiber lengths and effectively divide
From this specific length, that is, polarization separation length.
In addition, the structure that the first fibre core 1 of the invention and the second fibre core 2 are supported in two thin-walleds 3 in hollow pipe 4 can be effectively
The guided mode of first fibre core 1 and the second fibre core 2 is kept apart with external environment, avoids leading for the first fibre core 1 and the second fibre core 2
Mould is affected by, conducive to the propagation of THz wave.
With increasing between the first fibre core 1 and the second fibre core 2 along the gap gap that the direction of ellipse short shaft is arranged, polarization divides
It will increase from length, the increase of polarization beam apparatus device loss can be caused, the application of device in practice is affected, with gap
The coupling length of the reduction of gap, x and y-polarisation mould can all reduce, and will increase element manufacturing difficulty, for this purpose, the present invention two first is fine
The control range of gap gap between core 1 and the second fibre core 2 are as follows: 100 μm≤gap≤300 μm.
Fibre core ellipticity e, which crosses conference, allows more mould fields to transmit in polymeric media, so as to cause device transmission loss
Increase, with the reduction of fibre core ellipticity e, elliptical core is become closer in circle, and x and y-polarisation pattern differentials is caused to become
Small, the coupling length difference of x and y-polarisation mould also can accordingly reduce, and cause the increasing that polarization separation length increases and device transmission is lost
Greatly, for this purpose, the control range of ellipticity e of the present invention are as follows: 1.4≤e≤1.6.
Inventive polymers material is Topas cyclic olefine copolymer, and extrusion casint, injection moulding or three can be used in the present invention
Tie up printing shaping.
Embodiment
Refering to fig. 1, Fig. 2 selects minor axis diameter a=200 μm of the first fibre core 1 and the second fibre core 2, the μ of major diameter b=300
M, ellipticity are as follows: e=b/a=1.5,2 gap of two first fibre cores 1 and the second fibre core are as follows: gap=200 μm, the thickness s of thin-walled 3 are as follows: s
=25 μm；The outer diameter D and thickness of pipe wall t of hollow pipe 4 are respectively as follows: D=4 mm, t=300 μm；
In air refraction nair=1.0, polymer material is Topas cyclic olefine copolymer, refractive index n=1.53, material absorption
Loss is that 40 dB/m are calculated of the invention when frequency is 0.6 THz；
Referring to Fig.2, Fig. 2 gives four x-polarisation idol mould, x-polarisation surprise mould, y-polarisation idol mould and y-polarisation surprise mould transmission super model states
Under field distribution, from figure 2 it can be seen that two super model mould fields of the same polarization state of bielliptic(al) core structure have it is more
Overlapping region, but super model mode distributions have stronger polarization dependence, this illustrates that the mould field energy of x and y-polarisation can be the
Efficient coupling, but the coupling length L of x and y-polarisation are realized between one fibre core 1 and the second fibre core 2xAnd LyIt is different.
Refering to Fig. 3, Fig. 3 is the normalized power of x of the present invention and y-polarisation mould and the curve graph of transmission range, as seen from the figure,
The coupling length L of x and y-polarisationxAnd LyIt is 0.469 cm and 0.718 cm respectively, two orthogonal polarization states are specific by one
Fiber lengths can be realized and efficiently separate, this specific length, that is, separation length Ls, occur in fiber lengths to be 1.470 cm
Place (is marked in figure with red dotted line).
Refering to Fig. 4, Fig. 4 is the distribution map of the electric field of x of the present invention and y-polarisation mould in different conveying lengths, as seen from the figure, x
With transmission evolution of the y-polarisation mould in two fibre cores, that specifically show is z=0,0.500,1.000 and 1.470 cm
When two polarization states distribution map of the electric field, can intuitively see two polarization modes in the coupling condition of two fibre cores.In separation length z
When=1.470 cm, the energy of y-polarisation mould has been retained in the second fibre core 2, and the energy of x-polarisation mould is all coupled into
First fibre core 1, that is to say, that be completely separated from each other and come in two orthogonal polarization states of this length.
Refering to Fig. 5, Fig. 6, Fig. 5 is that the coupling length, separation length and fibre core gap gap of x of the present invention and y-polarisation mould change
Curve graph, for terahertz light fiber device, device length and device transmission loss be measure device performance important ginseng
Number, in e=1.5, Fig. 5 give x and y-polarisation mould coupling length and separation length with twin-core spacing change curve.From figure
In 6 as can be seen that in gap=300 μm, 350 μm and 400 μm, polarization separation length is respectively 1.890 cm, 2.698
Cm, 3.828 cm, polarization separation length increase with the increase of gap, so as to cause the increase of device transmission loss, therefore here
Select two fibre core spacing gap=200 μm.
Refering to Fig. 7, Fig. 8, Fig. 7 is that the coupling length, separation length and fibre core ellipticity of x of the present invention and y-polarisation mould change
Curve graph, Fig. 8 is the absorption loss of x of the present invention and y-polarisation mould and the curve graph that fibre core ellipticity changes；In gap=200 μm
When, fibre core ellipticity e, which crosses conference, allows more mould fields to transmit in polymeric media, so as to cause the increasing of device transmission loss
Add, therefore require e=1.4 here, polarization separation length is 1.43 cm at this time, and transmission loss is lower than 0.4 dB.
Refering to Fig. 9, Fig. 9 is the extinction ratio of x of the present invention and y-polarisation mould and the curve graph of frequency variation, selects the He of gap=200
E=1.4, in the case that other parameters are constant, x and y-polarisation mould extinction ratio are with the change curve of frequency, and bandwidth of a device is up to 0.02
THz, corresponding frequency range from 0.59 THz to 0.61 THz, the extinction ratio (ER) of x and y-polarisation state be respectively -18 dB and -
19 dB。
Refering to fig. 10, for the present invention in Terahertz Transmission system, incident thz beam passes through polymer poly focus lens
It is coupled to the region of the first fibre core 1 and the second fibre core 2 afterwards, the thz beam after focusing coupling is in fibre optic polarizing beam splitter
The function of completing transmission and polarization separation exports the Terahertz of X polarization and Y polarization respectively at the first fibre core 1 and the second fibre core 2
Light beam.Fibre optic polarizing beam splitter output end by way of end-to-end coupling, the first fibre core 1 and the second fibre core 2 are exported into X
The thz beam of polarization and Y polarization is coupled into 300 μm of sub-wavelength polymer optical fiber respectively.In sub-wavelength polymer optical fiber
The X being divergent is polarized that with the Y thz beam polarized to be focused realization parallel by polymer poly focus lens by output end
Outgoing, in order to transmit and apply the thz beam of X polarization and Y polarization in Terahertz system.
Polarization beam apparatus of the invention is expected to realize that practical application, the present invention are relatively simple in narrow band terahertz band Transmission system
Single structure and shorter length can realize production with extrusion casint, injection moulding or extrusion molding or three-dimensional printing technology.
Claims (2)
1. a kind of terahertz polarization beam splitter of bielliptic(al) core structure optical-fiber type, which is characterized in that the beam splitter is polymer
Manufactured strip tube-like piece, section are hollow pipe (4), hollow pipe (4) inner wall along be axially arranged with two panels it is parallel and tube hub
Symmetrical thin-walled (3), the end of two thin-walleds (3) are connect with hollow pipe (4) inner wall, and the middle part of two thin-walleds (3) is supported by ellipse respectively
Round the first fibre core (1) and the second fibre core (2)；
The both ends of transverse are connect with thin-walled (3) on first fibre core (1) and the second fibre core (2), the first fibre core (1) and
Gap gap is equipped with along the direction of ellipse short shaft between two fibre cores (2)；And gap are as follows: 100 μm≤gap≤300 μm；
First fibre core (1) and the elliptical minor axis diameter a of the second fibre core (2) are quantitative, and a=200 μm；Major diameter b is
Variable；The ellipticity are as follows: e=b/a；And 1.4≤e≤1.6；
The thickness s of the thin-walled (3) are as follows: s=25 μm；
The outer diameter D and thickness of pipe wall t of the hollow pipe (4) are respectively as follows: D=4 mm, t=300 μm.
2. a kind of terahertz polarization beam splitter of bielliptic(al) core structure optical-fiber type according to claim 1, feature exist
In the polymer material is Topas cyclic olefine copolymer.
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| CN201910565406.7A CN110261959A (en) | 2019-06-27 | 2019-06-27 | A kind of terahertz polarization beam splitter of bielliptic(al) core structure optical-fiber type |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910565406.7A CN110261959A (en) | 2019-06-27 | 2019-06-27 | A kind of terahertz polarization beam splitter of bielliptic(al) core structure optical-fiber type |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645541A (en) * | 2013-12-11 | 2014-03-19 | 江苏大学 | Terahertz polarization beam splitter |
| CN105044841A (en) * | 2015-09-06 | 2015-11-11 | 中国计量学院 | Terahertz wave polarization beam splitter based on multiple dielectric cylinder structures |
| CN106597602A (en) * | 2015-10-20 | 2017-04-26 | 武汉长盈通光电技术有限公司 | Micro-structure elliptical suspension core polarization maintaining optical fiber and manufacturing method thereof |
| CN107643561A (en) * | 2017-11-07 | 2018-01-30 | 江西师范大学 | A kind of low-loss terahertz polarization beam splitter |
-
2019
- 2019-06-27 CN CN201910565406.7A patent/CN110261959A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645541A (en) * | 2013-12-11 | 2014-03-19 | 江苏大学 | Terahertz polarization beam splitter |
| CN105044841A (en) * | 2015-09-06 | 2015-11-11 | 中国计量学院 | Terahertz wave polarization beam splitter based on multiple dielectric cylinder structures |
| CN106597602A (en) * | 2015-10-20 | 2017-04-26 | 武汉长盈通光电技术有限公司 | Micro-structure elliptical suspension core polarization maintaining optical fiber and manufacturing method thereof |
| CN107643561A (en) * | 2017-11-07 | 2018-01-30 | 江西师范大学 | A kind of low-loss terahertz polarization beam splitter |
Non-Patent Citations (1)
| Title |
|---|
| HONGZHI CHEN: "《Terahertz polarization splitter based on a dual-elliptical-core polymer fiber》", 《APPLIED OPTICS》 * |
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