CN203324623U - Solid structure for forming adjustable multipath all-optical switch - Google Patents
Solid structure for forming adjustable multipath all-optical switch Download PDFInfo
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- CN203324623U CN203324623U CN2013203944646U CN201320394464U CN203324623U CN 203324623 U CN203324623 U CN 203324623U CN 2013203944646 U CN2013203944646 U CN 2013203944646U CN 201320394464 U CN201320394464 U CN 201320394464U CN 203324623 U CN203324623 U CN 203324623U
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Abstract
The utility model discloses a solid structure for forming an adjustable multipath all-optical switch, which comprises a photonic crystal optical fiber segment. The photonic crystal optical fiber segment is internally provided with a plurality of through holes which are coaxial with the optical fiber. Each through hole is internally provided with an optical medium filling layer. Two segments of the photonic crystal optical fiber segment are respectively fused and coaxially connected with a single-mode optical fiber segment. The external diameter of the single-mode optical fiber segment is same with that of the photonic crystal optical fiber segment. Furthermore the connecting surface between the single-mode optical fiber segment and the photonic crystal optical fiber segment are aligned. The solid structure can be applied for forming the adjustable multipath all-optical switch and has an advantage of easy integration.
Description
Technical field
The utility model belongs to the all-optical switch technical field, specifically refers to a kind of adjustable multi-channel all-optical switch entity structure.
Background technology
Photoswitch is changed or logical operation mutually to the light signal in light transmission, with the exchange that realizes light signal or the self-protection of network, is basis and the Primary Component of optical communication technique.Electric control optical switch need to experience twice transfer process of light-electrical-optical, at switching response, insurmountable bottleneck is arranged on the time.Optically controlled optical switch utilizes the interaction of photon and material to realize, can make light exchange and light path realize in the scope of light territory fully, improves photoswitch speed.Adopt at present the all-optical switch of nonlinear optics method, use high light to act on nonlinear optical material, change the parameters such as its refractive index, absorption coefficient, make the flashlight transmitted in medium produce the phase place variation, reach the purpose of controlling its intensity, have that switching threshold is high, extinction ratio is low, switching rate is low and is connected the shortcomings such as difficult with Networks of Fiber Communications.
Photonic crystal has photon band gap, can cause the effects such as photon band gap migration, defect mode migration, nonlinear frequency conversion in the pump light effect, can effectively control the transmission state of photon, realize the all-optical switch function, but the pumping light power needed is large, be difficult for being connected with signal transmission fiber, insertion loss is large, causes thermal effect.
Photonic crystal fiber is periodically ordered arrangement of covering airport, and the 2 D photon crystal that fibre core is solid silicon or airport defect, have higher optical nonlinearity and photonic band gap effects, can realize the all-optical switch function.Nonlinear optical loop mirror all-optical switch based on photonic crystal fiber, utilize Cross-phase Modulation to make the flashlight of two beam reversal's transmission produce the nonlinear phase shift characteristic, but need fiber amplifier, the length of photonic crystal fiber is tens of rice, the integrated difficulty of full optical device, device cost is also higher.By fill the refractive index sensitive material in the airport of photonic crystal fiber, the refractive index that changes packing material can be controlled photon motion and leaded light, realizes light switch function.The photonic crystal fiber of filling based on liquid crystal has the all-optical switch characteristic, and the response time of photoswitch is long, and photoswitch speed is slower.
Therefore, the problem that at present all-optical switch mainly exists comprises: owing to utilizing luminous power that nonlinear optical effect needs are higher to cause the impact of thermal effect, the switch power of photoswitch and switching time are conflicting, and optical device integrated more difficult entirely.
Summary of the invention
The purpose of this utility model is the shortcoming and defect existed in order to overcome prior art, and provide a kind of be easy to realize full optical device integrated for forming the entity structure of adjustable multi-channel all-optical switch.
For achieving the above object, the technical solution of the utility model is to include the photonic crystal fiber section, be provided with a plurality of through holes with fiber-coaxial in this photonic crystal fiber section, be provided with the optical medium packed layer in this through hole, the two ends of described photonic crystal fiber section welding respectively coaxially connect the single-mode fiber section, this single-mode fiber section and the same external diameter of photonic crystal fiber section, and the two joint face alignment arranges.
Pass through said structure, select dye adulterated ferroelectric liquid crystals to be filled in the optical medium packed layer as optical medium, utilize dyestuff in the photic cis-trans isomerism effect of controlling under light action, drive the liquid crystal molecule reorientation, cause dye adulterated ferroelectric liquid crystals variations in refractive index, cause the photon band gap migration of photonic crystal fiber, control the break-make of transmission light, realize the purpose of all-optical switch, the above-mentioned entity structure of this setting is being applied to all-optical switch, there is good compatibility with conventional optical fibers, be easy to integrated.In addition, this structure change to be controlled light wavelength, intensity, polarization state, and realization can be in harmonious proportion the all-optical switch of multichannel.
Further setting is that the connecting end surface of the single-mode fiber section of described photonic crystal fiber section and both sides is burnishing surface, and this burnishing surface is axial vertical with the photonic crystal fiber section.
Further arranging is that described a plurality of through hole is done the periodic arrangement setting by triangle on the xsect of photonic crystal fiber section.
Further arrange is that described photonic crystal fiber section is the real core microstructured optical fibers in LMA series large aperture.
In sum, the utility model can be applicable to form the adjustable multi-channel all-optical switch, and is easy to the advantages such as integrated.
Below in conjunction with specification drawings and specific embodiments, the utility model is described further.
The accompanying drawing explanation
Fig. 1 the utility model embodiment structural representation;
Fig. 2 the utility model embodiment photonic crystal fiber section cross-sectional view;
Fig. 3 the utility model is for forming the device for measuring properties theory diagram of adjustable multi-channel all-optical switch;
Fig. 4 the utility model is used for forming the conducting optical wavelength of adjustable multi-channel all-optical switch with the typical change curve of controlling light intensity;
Fig. 5 the utility model is used for forming the conducting optical wavelength of adjustable multi-channel all-optical switch with the typical change curve of controlling the light polarization angle.
Embodiment
Below by embodiment, the utility model is specifically described, only for the utility model is further described, can not be interpreted as the restriction to the utility model protection domain.
Embodiment of the present utility model as shown in Figure 1-2, include photonic crystal fiber section 2, be provided with a plurality of through holes 3 with fiber-coaxial in this photonic crystal fiber section, be provided with the optical medium packed layer in this through hole, the two ends of described photonic crystal fiber section welding respectively coaxially connect single-mode fiber section 1, this single-mode fiber section 1 and the same external diameter of photonic crystal fiber section 2, and the two joint face alignment arranges.The described photonic crystal fiber section 2 of the present embodiment is burnishing surface with the connecting end surface of the single-mode fiber section 1 of both sides, and this burnishing surface is axial vertical with the photonic crystal fiber section.In addition, described a plurality of through holes are done the periodic arrangement setting by triangle on the xsect of photonic crystal fiber section, as shown in Figure 2.
As particularly, the described photonic crystal fiber section 2 of the present embodiment is preferably LMA series large aperture real core microstructured optical fibers (Crystal Fibre A/S, Denmark, airport diameter, pitch of holes, fibre diameter are respectively 5.7 μ m, 8.3 μ m, 125 μ m), this airport forms above-mentioned through hole 3, when reality is filled, adopt air pressure method that air is extruded, complete optical medium and fill.
The utility model structure can illustrate for the principle that builds the adjustable multi-channel all-optical switch:
1, the photonic band gap effects of photonic crystal fiber
Photon band gap is a frequency field, and in this scope, the density of states of photon is zero, and when the incident light frequency drops on wherein, it can not pass photonic crystal.Photon band gap is the key character of photonic crystal fiber.Photonic crystal fiber has complicated structure, by parameters such as careful design specific inductive capacity, filling rate and lattice types, can obtain having the photonic crystal fiber of a certain frequency range forbidden photon band.Photonic Bandgap-photonic Crystal Fibers can greatly reduce the luminous energy loss in transmitting procedure, but also can eliminate the existing material dispersion of conventional optical fibers and waveguide dispersion, realization is supported single mode transport in wider frequency range, for manufacturing low-loss all-optical switch device, provides the foundation.
Real core band gap-photonic crystal fiber, it is the cylindrical high-index material in the arrangement of clad region fill cycle, due to the periodic structure in covering, form photon band gap and fetter light field to external diffusion, make light field can be bound in the transmission of low-refraction De Shixin district.In the medium of periodic structure, it is also discontinuous with the transmission mode of the different light fields of light frequency, distributing, for a kind of specific cladding structure, existing some optical frequency can not transmit therein, for photon band-gap optical fiber, light with this band frequency can not diffuse out by covering, and can only be bound in vertically transmission in fuse, forms the leaded light mechanism of photon band-gap optical fiber.Change the refractive index of clad region packing material, just can change the leaded light wavelength of band gap-photonic crystal fiber.
, dye adulterated ferroelectric liquid crystals light-operated reorientation characteristic
Azo dyes its chromophore molecule under the ultraviolet excitation effect rearranges, concerning the azo dye molecule, and when the rotation dipole moment of its molecule is parallel to the linear polarized uv direction vector, incident polarized light energy absorption maximum.When azo molecules is subject to polarized light, excite, excited molecule will depart from its initial position and occur to arrange again.Azo molecules will experience the transformation of its molecular long axis perpendicular to the Polarization Vector direction, and the characteristic responded the most fast.When linearly polarized light when thering is the medium of optically active, because there are two kinds of configurations that chirality is different in same optically active molecule in medium, therefore the dextrorotation that they resolve into linearly polarized light is different with the Left-hand circular polarization light absorption, thereby produce circular dichroism.Chirality isomery in Azo dye not only makes molecule have optical activity, and N-N key and the large π key of phenyl ring formation conjugation, reduced the transition energy level of electronics, so be easy to obtain good dichroism, the scope of polarizability and wider absorption visible ray preferably.
Ferroelectric liquid crystals has smectic phase, and the pitch angle that is greater than zero is arranged between molecular long axis and smectic layer normal, contains the optically-active group, and the net dipole moment of molecular long axis vertical direction is non-vanishing.Ferroelectric liquid crystals has layer structure, and the upper liquid crystal molecule of each layer has angle with normal to bedding plane, and advances along normal direction, and the formation helical structure also rotates along screw axis perpendicular to the permanent dipole of molecular long axis.The pitch of ferroelectric liquid crystals and spontaneous polarization strength are all to additional light, field and temperature variation sensitivity, the pitch of different materials ferroelectric liquid crystals is different with the scope of temperature and electric field change with spontaneous polarization strength, can utilize the ferroelectric liquid crystals of several different temperatures characteristics to be mixed to get according to a certain percentage temperature and electric field change insensitive and only to the ferroelectric crystal mixture of light sensitive.The refractive index of ferroelectric liquid crystals is relevant with the arrangement of molecule, and the sensing of liquid crystal is vowed
nWith the shaft axis of optic fibre angle be θ,
With
Be respectively the refractive index of the non-ordinary light of liquid crystal and ordinary light, the refractive index of ferroelectric liquid crystals is:
（1）
When azo dyes is doped in liquid crystal, more longer and cis-structure is more similar to the molecular structure of main body in syn-isomerism than in trans-isomerism owing to changing dipole moment and major axis, dyestuff is weaker in syn-isomerism than in trans-isomerism with the interaction of liquid crystal, and trans-isomer is more more effective to producing dichroism than the arrangement of cis-isomer.Simultaneously, the syn-isomerism order parameters of dyestuff is not extremely to rely on liquid crystal phase, and the order parameters of trans-isomerism dyestuff coordinates fairly goodly with the parameter of liquid crystal phase.So the trans-isomer of azo dyes makes this system have good dichroism in the dye-doped liquid crystal system.Light absorbing azo dyes generation isomery changes, and causes the ferroelectric liquid crystal molecule reorientation, according to (1) formula, causes dye adulterated ferroelectric liquid crystals refractive index to change.
, dye adulterated ferroelectric liquid crystals fills the light-operated switch characteristic of photonic crystal fiber
The microstructured optical fibers all-optical switch structure of based on dye adulterated ferroelectric liquid crystals filling of the utility model for forming, fill azobenzene dye doping ferroelectric liquid crystals in the airport of the large aperture of microstructured optical fibers covering, utilize dyestuff to cause liquid crystal molecule reorientation angle θ in the photic cis-trans isomerism effect of controlling under light action, photonic crystal fiber covering equivalent refractive index is changed, cause the photon band gap migration of microstructured optical fibers, realize the all-optical switch function.Control light wavelength, intensity, polarization state by change, realize the quick response of all-optical switch.
As shown in Figure 3, the device for measuring properties of assembly,
Flashlight and control measuring light power: with the light power meter, measure;
The transmitted spectrum of all-optical switch and measuring light power: use spectrometer measurement;
Control polarized state of light: realize with Polarization Control optical fiber;
Control the measurement of switch power, switching speed, extinction ratio and the power attenuation of all-optical switch under light different wave length, intensity, polarization: with light power meter and spectrometer conjunction measuring;
As shown in Figure 4, the all-optical switch conducting optical wavelength that Fig. 4 is measurement is with the typical change curve of controlling light intensity, and along with the increase of controlling light intensity, photoswitch conducting optical wavelength also increases.
As shown in Figure 5, shown in Fig. 5 for the all-optical switch conducting optical wavelength measured with the typical change curve of controlling the light polarization angle, along with the increase of controlling the light polarization angle, photoswitch conducting optical wavelength also increases.
Claims (4)
1. one kind for forming the entity structure of adjustable multi-channel all-optical switch, it is characterized in that: include the photonic crystal fiber section, be provided with a plurality of through holes with fiber-coaxial in this photonic crystal fiber section, be provided with the optical medium packed layer in this through hole, the two ends of described photonic crystal fiber section welding respectively coaxially connect the single-mode fiber section, this single-mode fiber section and the same external diameter of photonic crystal fiber section, and the two joint face alignment arranges.
2. according to claim 1 for forming the entity structure of adjustable multi-channel all-optical switch, it is characterized in that: the connecting end surface of the single-mode fiber section of described photonic crystal fiber section and both sides is burnishing surface, and this burnishing surface is axial vertical with the photonic crystal fiber section.
3. according to claim 1 a kind of for forming the entity structure of adjustable multi-channel all-optical switch, it is characterized in that: described a plurality of through holes are done the periodic arrangement setting by triangle on the xsect of photonic crystal fiber section.
4. according to claim 1 a kind of for forming the entity structure of adjustable multi-channel all-optical switch, it is characterized in that: described photonic crystal fiber section is the real core microstructured optical fibers in LMA series large aperture.
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| CN2013203944646U CN203324623U (en) | 2013-07-02 | 2013-07-02 | Solid structure for forming adjustable multipath all-optical switch |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772819A (en) * | 2016-12-01 | 2017-05-31 | 南京邮电大学 | The interference-type all-optical switch of chalcogenide glass photonic crystal fiber 2 × 2 and control method |
| WO2019010667A1 (en) * | 2017-07-13 | 2019-01-17 | 深圳大学 | Photonic crystal fibre electro-optic switch and preparation method therefor |
| CN113009724A (en) * | 2021-02-22 | 2021-06-22 | 安徽大学 | Wide-range multiband thermo-optic switch and manufacturing method thereof |
-
2013
- 2013-07-02 CN CN2013203944646U patent/CN203324623U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772819A (en) * | 2016-12-01 | 2017-05-31 | 南京邮电大学 | The interference-type all-optical switch of chalcogenide glass photonic crystal fiber 2 × 2 and control method |
| CN106772819B (en) * | 2016-12-01 | 2019-04-30 | 南京邮电大学 | 2 × 2 interference-type all-optical switch of chalcogenide glass photonic crystal fiber and control method |
| WO2019010667A1 (en) * | 2017-07-13 | 2019-01-17 | 深圳大学 | Photonic crystal fibre electro-optic switch and preparation method therefor |
| CN113009724A (en) * | 2021-02-22 | 2021-06-22 | 安徽大学 | Wide-range multiband thermo-optic switch and manufacturing method thereof |
| CN113009724B (en) * | 2021-02-22 | 2023-09-08 | 安徽大学 | Wide-range multiband thermo-optical switch and manufacturing method thereof |
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Granted publication date: 20131204 Termination date: 20140702 |
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