CN107861267A - A kind of adjustable multicast and exchange photoswitch of splitting ratio and method - Google Patents
A kind of adjustable multicast and exchange photoswitch of splitting ratio and method Download PDFInfo
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- CN107861267A CN107861267A CN201711026628.9A CN201711026628A CN107861267A CN 107861267 A CN107861267 A CN 107861267A CN 201711026628 A CN201711026628 A CN 201711026628A CN 107861267 A CN107861267 A CN 107861267A
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- Prior art keywords
- photoswitch
- luminous
- power distributor
- multicast
- adjustable
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0147—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on thermo-optic effects
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/011—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour in optical waveguides, not otherwise provided for in this subclass
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Integrated Circuits (AREA)
Abstract
The present invention relates to a kind of multicast and exchange photoswitch and method, belong to technical field of photo communication, and in particular to a kind of adjustable multicast and exchange photoswitch side of splitting ratio and method.The switch and method are using the adjustable luminous-power distributor of splitting ratio, single chip integrated multicast and exchange photoswitch, based on the damp refractive index for obtaining interferometer structure, changing waveguide using thermo-optic effect, electrooptic effect of Mach, so as to realize the regulation of splitting ratio.
Description
Technical field
The present invention relates to a kind of multicast and exchange photoswitch and method, belong to technical field of photo communication, and in particular to Yi Zhongfen
Light is than adjustable multicast and exchange photoswitch side and method.
Background technology
Dense wavelength division multiplexing system (DWDM) is current most common photosphere networking technology, can by multiplexing demultiplexing device
To realize tens of ripples even transfer capability of ripples up to a hundred, but current wavelength-division multiplex system, it is substantially or a point arrives
The line system of point, the optical link system constructing that most of photosphere networkings can only be realized by terminal station (TM).Occur later on
Optical add/drop multiplexer (OADM), evolution of the networking from point to points to looped network is gradually stepped.But due to function limited OADM,
The optical channel of upper and lower fixed number and wavelength is typically only capable to, does not realize flexible photosphere networking really.Therefore, anticipated from certain
Said in justice, the wavelength-division multiplex system of early stage does not have the photosphere networking realized truly, it is difficult to meets business network IPization
With the requirement of packetizing, such as the traffic scheduling ability of network, reliability, maintainability, scalability, manageability etc..This
Kind situation is just improved until the appearance of ROADM (ROADM).In order to meet the needs of IP network, basis
The construction of bearer network gradually adopts a kind of photosphere reconfiguration technique using ROADM as representative, based on the construction of bearer network provide
Brand-new thinking.2004~2005 years, ROADM rose in Japan, and as the emphasis of most of operators concern.2006~
2007, ROADM was in the ground extensive use such as North America, Europe and Japan.ROADM application also from initial metropolitan area, starts
Develop to LAN and backbone network.
Road port is restricted ROADM equipment in terms of flexibility up and down, this to be limited in two-dimentional ROADM equipment applications
In it is prominent not enough, but in multidimensional ROADM equipment networks will extreme influence photosphere scheduling feature performance, be embodied in industry
Circuit node and photoelectricity light (OEO) regeneration node need substantial amounts of manual intervention up and down for business, can not realize real end-to-end configuration.
Therefore, ROADM is not as operator wishes always restructural.Preferable platform should enable operator exist with any frequency
(or straight-through) any wavelength, simple and easy above and below any direction, is not required to execute-in-place.Realizing the condition of this target includes：
Without color (being suitable for any wavelength), non-directional (can in any direction enter, exit node), Lothrus apterus (exchange frame
Structure can prevent to produce conflict between wavelength in reconstructing path), without grid (channel plan and wavelength interval can be changed to adapt to
Guard band or modulation format change, increase channel density etc.).Systems provider is intended to support all above-mentioned characteristics.Quan Guang
Exchange is following developing direction, is faced the future development, and new optical-fiber network networking technology is all being called in technology and market.Through excessive
The progressively improvement of year technology, function and aspect of performance, CDC-F ROADM (i.e. colourless directionless Lothrus apterus and the flexible grid of support
The reconfigurable optical bifurcated multiplexer of ability) it is ripe, it is by automating out ingress, realizing the dynamic wave of all nodes
Long function, and simplifying operation of equipment.These technologies can also be in the regeneration before intermediate node realizes that wavelength enters optical fiber, and can be used for
Wavelength convert.So as to substantially solve many problems that photosphere networking is run into.2015, Verizon announced to use Ciena
Carry out disposing CDC-F ROADM technologies with Cisco packet optical transport platform, transmitted first in metropolitan area 100G and ultra long haul light
It is commercial that scale is obtained in net.
Multicast and exchange photoswitch are one of key devices in current ROADM and following CDC-F ROADM equipment, are
A kind of unrelated optical device of wavelength, it input signal can will be divided into multiple-channel output optical signal all the way, transmit to different ports.
Multicast and exchange photoswitch and wavelength-selective switches are used cooperatively, and can meet colourless ROADM systems, undirected, Lothrus apterus, flexible lattice
The functional requirement of grid, all there is very important effect for increasing the flexibility of networking, reducing cost.
Multicast and exchange photoswitch include optical power divider (splitter) and photoswitch (optical switch), both
Discrete scheme can be used, is connected with optical fiber, but as the increase of port number, assembly difficulty and volume can all increase；Light
Power splitter and photoswitch can also use single chip integrated scheme, using the splitter of multiple different splitting ratios, such as
In 8 × 8 multicast and exchange photoswitch, to use splitting ratio is 1：1、1：2、1：3、1：4、1：5、1：6 and 1：7
splitter.The accuracy of splitting ratio determines that the performances such as the insertion loss of device, Insertion Loss uniformity and its extinction ratio refer to
Mark.High splitting ratio required precision, the high-precision requirement of particularly small splitting ratio, waveguide chip manufacture craft tolerance is proposed
Strict requirements, meanwhile, high tolerances necessarily affect yield rate and the cost of chip.Therefore, in production application,
An urgent demand splitter splitting ratio is adjustable, so as to reduce process allowance requirement and production cost.The present invention is exactly to drop
Low chip cost, improve chip yield, so as to propose it is a kind of with adjustable light splitting than splitter, single chip integrated more
Broadcast exchange photoswitch.
The content of the invention
The process allowance that the present invention mainly solves present in prior art requires higher, the technical problems such as yield rate is low,
Propose a kind of adjustable multicast and exchange photoswitch of splitting ratio and method.The switch and method use the adjustable luminous power of splitting ratio
Distributor, single chip integrated multicast and exchange photoswitch, based on Mach-Ze get interferometer structures, using thermo-optic effect, electrooptic effect
To change the refractive index of waveguide, so as to realize the regulation of splitting ratio.
The above-mentioned technical problem of the present invention is mainly what is be addressed by following technical proposals：
A kind of adjustable multicast and exchange photoswitch of splitting ratio, including：Waveguide type luminous-power distributor, based on Mach-Ze get
Interferometer framework, at least one in the different multiple interfere arms of its optical path length set having heaters.
Preferably, a kind of above-mentioned adjustable multicast and exchange photoswitch of splitting ratio, the interfere arm both sides are provided with orientation
Coupler.
Preferably, the above-mentioned adjustable multicast and exchange photoswitch of a kind of splitting ratio, the heater heat for metallic film
Device.
Preferably, the above-mentioned adjustable multicast and exchange photoswitch of a kind of splitting ratio, in addition to a Waveguide-type optical switch, with institute
Waveguide type luminous-power distributor is stated to be integrated in same optical waveguide substrates.
Preferably, the above-mentioned adjustable multicast and exchange photoswitch of a kind of splitting ratio, the Metal Membrane Heater material bag
Include the one or more in Al, Ti, W, Ni, Cr.
Preferably, the above-mentioned adjustable multicast and exchange photoswitch of a kind of splitting ratio, including：
First One In and Two Out photoswitch, its input are connected with input waveguide, and output end connects the second One In and Two Out respectively
The input of the input of photoswitch and the first luminous-power distributor；
Second One In and Two Out photoswitch, its output end connect the input and the 3rd 1 of the first luminous-power distributor respectively
Enter scene 2 photoswitch input；
Second luminous-power distributor, its input connect the input of the first luminous-power distributor and the 3rd 1 entered respectively
The output end of scene 2 photoswitch；
3rd luminous-power distributor, the output end of its first via input the second luminous-power distributor of connection；Its second road is defeated
Enter and be connected by singly entering singly to go out photoswitch with the output end of the 3rd One In and Two Out photoswitch；Its output end and waveguide output end phase
Even.
Preferably, the above-mentioned adjustable multicast and exchange photoswitch of a kind of splitting ratio, first luminous-power distributor are 1：1
Luminous-power distributor；Second luminous-power distributor is 1：2 luminous-power distributor；3rd luminous-power distributor is
1：3 luminous-power distributor.
Preferably, the above-mentioned adjustable multicast and exchange photoswitch of a kind of splitting ratio, the two-way input of each luminous-power distributor
Respectively from different input waveguides.
A kind of adjustable multicast of splitting ratio exchanges light method, including：
Waveguide type luminous-power distributor is constructed based on Mach-Ze get interferometers framework；
Change between two interfere arms of the waveguide type luminous-power distributor θ of phase difference 2 to realize different splitting ratios.
Preferably, a kind of adjustable multicast of above-mentioned splitting ratio exchanges light method, including：By heating the waveguide type light
One interfere arm of power divider changes the θ of phase difference 2 between two interfere arms.
Therefore, the invention has the advantages that：
1st, using with adjustable light splitting than splitter, independent of process allowance, greatly improve chip yield；
2nd, using integrated micro metal thin film heater, splitter light splitting is realized using the thermo-optic effect of waveguide
Than adjustable；
3rd, process allowance is reduced, significantly improves yield rate, suitable for commercialization application, is had inexpensive, highly reliable
The advantages of property.
Brief description of the drawings
Fig. 1 is the structural representation of 4 × 4 multicast and exchange photoswitch；
Fig. 2 is the structural representation of the nonadjustable luminous-power distributor of splitting ratio；
Fig. 3 is the dichroism figure of the nonadjustable luminous-power distributor of splitting ratio；
Fig. 4 is the structural representation of the adjustable luminous-power distributor of splitting ratio proposed by the present invention.
Wherein：
1-1 × 2 photoswitches；2-1 × 1 photoswitch；3-splitting ratio is 1：1 luminous-power distributor；4-splitting ratio is
1：2 luminous-power distributor；5-splitting ratio is 1：3 luminous-power distributor；6-form the first of Mach-Ze get interferometers
Directional coupler；Second directional coupler of 7-composition Mach-Ze get interferometers；8-integrated Metal Membrane Heater；
101st, 4 input waveguides of 102,103,104-4 × 4 multicast and exchange photoswitch；201、202、 203、204—4
4 output waveguides of × 4 multicast and exchange photoswitch；
The coefficient of coup of-directional coupler 1 and the product of coupling length；The coupled systemes of-directional coupler 2
The product of number and coupling length；Phase difference between 2 θ-interfere arm of Mach-Ze get interferometers two.
Embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment：
The present embodiment is by taking 4 × 4 multicast and exchange photoswitch as an example, to illustrate that a kind of splitting ratio proposed by the present invention is adjustable
Single chip integrated multicast and exchange photoswitch.
4 × 4 multicast and exchange photoswitch as shown in Figure 1 include 12 2 × 2 photoswitches, 41 × 2 photoswitches, 4 points
Light ratio is 1：1 luminous-power distributor, 4 splitting ratios are 1：2 luminous-power distributor and 4 splitting ratios are 1：3 luminous power
Distributor.101st, 102,103,104 be 4 input ports of multicast and exchange photoswitch, 201,202,203,204 be multicast exchange
4 output ports of photoswitch.From the optical signal of any input port (such as 101) input, by the control of multiple photoswitches
System, can the either output port selectively output (such as 201) from 4 output ports；1：1、 1：2、1：The design of 3 splitting ratios,
So that being inputted from any input port, there is identical loss from the optical signal of either output port output.
The splitting ratio of the luminous-power distributor of prior art is fixed, and immutable, its structure is as shown in Fig. 2.In this reality
Apply in example and illustrate by taking the Mach-Ze get interferometers comprising two directional couplers as an example.Mach-Ze get interferometers shown in Fig. 2
Including directional coupler 6, directional coupler 7 and different two interfere arms of optical path length.By designing directional coupler 6Directional coupler 7And the θ of phase difference 2 between the interfere arm of Mach-Ze get interferometers two, as can be seen from Figure 3：It is different
's Mach-Ze get the interferometers of 2 θ design loads will have different splitting ratios, once2 θ are determined
Afterwards, the splitting ratio of luminous-power distributor will immobilize.High splitting ratio required precision, the high accuracy of particularly small splitting ratio will
Ask, strict requirements are proposed to waveguide chip manufacture craft tolerance, meanwhile, high tolerances necessarily affect yield rate and core
The cost of piece.Therefore, in production application, an urgent demand splitter splitting ratio is adjustable, so as to reduce process allowance
It is required that and production cost.
Therefore, the present invention improves chip yield, adjustable light splitting is carried so as to propose one kind to reduce chip cost
The splitter of ratio, single chip integrated multicast and exchange photoswitch.
Ideally, target design value2 θ can obtain the splitting ratio of target, but under actual conditions, by
It is actual in process allowance2 θ and design load always have certain deviation, and splitting ratio pair
2 θ are very sensitive.Therefore, the actual splitting ratio of luminous-power distributor differs larger with design object value, so that multicast exchanges light
The yield rate of switch is very low.In order to meet industrialization demand, it is necessary to take certain measure to correct process allowance.The present invention adopts
With in two interfere arms of Mach-Ze get interferometers integrated metal thin film heater correct the deviation of splitting ratio, such as Fig. 4 institutes
Show.Metal Membrane Heater has certain resistance, after making alive, will generate heat, so that the waveguide temperature liter under it
It is high.Because waveguide material has thermo-optic effect, the change of temperature will bring the change of refractive index, therefore, the phase between two interfere arms
Potential difference 2 θ, 2 θ change can realize the adjustable of splitting ratio.To in two interfere arms of Mach-Ze get interferometers plus different electricity
Pressure, makes the temperature in two interfere arms at waveguide different, due to the thermo-optic effect of waveguide material, refractive index caused by different temperatures
Change it is different, it is achieved thereby that 2 θ phase differences between two interfere arms.By principle of interference it is recognised that out of phase difference causes horse
Splitting ratio between the output port of He-Ze get interferometers two is inconsistent.The voltage obtained according to measuring in advance and splitting ratio relation, can
With according to the different luminous voltage more different than setting.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (10)
- A kind of 1. adjustable multicast and exchange photoswitch of splitting ratio, it is characterised in that including：Waveguide type luminous-power distributor, is based on Mach-Ze get interferometer frameworks, at least one in the different multiple interfere arms of its optical path length set having heaters.
- A kind of 2. adjustable multicast and exchange photoswitch of splitting ratio according to claim 1, it is characterised in that the interfere arm Both sides are provided with directional coupler.
- 3. the adjustable multicast and exchange photoswitch of a kind of splitting ratio described in as requested 1, it is characterised in that the heater is gold Belong to thin film heater.
- 4. the adjustable multicast and exchange photoswitch of a kind of splitting ratio described in as requested 1, it is characterised in that also including a waveguide type Photoswitch, it is integrated in the waveguide type luminous-power distributor in same optical waveguide substrates.
- 5. the adjustable multicast and exchange photoswitch of a kind of splitting ratio described in as requested 1, it is characterised in that the metallic film adds Hot equipment material includes the one or more in Al, Ti, W, Ni, Cr.
- A kind of 6. adjustable multicast and exchange photoswitch of splitting ratio described in as requested 1, it is characterised in that including：First One In and Two Out photoswitch, its input are connected with input waveguide, and output end connects the second One In and Two Out light and opened respectively The input of the input of pass and the first luminous-power distributor；Second One In and Two Out photoswitch, its output end connect the input of the first luminous-power distributor and the 3rd 1 enter two respectively Light extraction switch input terminal；Second luminous-power distributor, its input connect the input and the 3rd One In and Two Out of the first luminous-power distributor respectively The output end of photoswitch；3rd luminous-power distributor, the output end of its first via input the second luminous-power distributor of connection；The input of its second tunnel is logical Cross and singly enter singly to go out photoswitch and be connected with the output end of the 3rd One In and Two Out photoswitch；Its output end is connected with waveguide output end.
- A kind of 7. adjustable multicast and exchange photoswitch of splitting ratio described in as requested 5, it is characterised in that first luminous power Distributor is 1：1 luminous-power distributor；Second luminous-power distributor is 1：2 luminous-power distributor；3rd light Power divider is 1：3 luminous-power distributor.
- A kind of 8. adjustable multicast and exchange photoswitch of splitting ratio described in as requested 5, it is characterised in that each luminous-power distributor Two-way input respectively from different input waveguides.
- 9. a kind of adjustable multicast of splitting ratio exchanges light method, it is characterised in that including：Waveguide type luminous-power distributor is constructed based on Mach-Ze get interferometers framework；Change between two interfere arms of the waveguide type luminous-power distributor θ of phase difference 2 to realize different splitting ratios.
- 10. the adjustable multicast of a kind of splitting ratio according to claim 1 exchanges light method, it is characterised in that including：Pass through An interfere arm of the waveguide type luminous-power distributor is heated to change the θ of phase difference 2 between two interfere arms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711026628.9A CN107861267A (en) | 2017-10-27 | 2017-10-27 | A kind of adjustable multicast and exchange photoswitch of splitting ratio and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711026628.9A CN107861267A (en) | 2017-10-27 | 2017-10-27 | A kind of adjustable multicast and exchange photoswitch of splitting ratio and method |
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| CN201711026628.9A Pending CN107861267A (en) | 2017-10-27 | 2017-10-27 | A kind of adjustable multicast and exchange photoswitch of splitting ratio and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779440A (en) * | 2019-10-12 | 2020-02-11 | 浙江大学 | Polarization insensitive photosensitive switch based on Mach Zehnder interferometer structure |
| CN111211844A (en) * | 2020-04-20 | 2020-05-29 | 北京中创为南京量子通信技术有限公司 | Quantum key receiving chip and device |
| CN115576114A (en) * | 2021-10-29 | 2023-01-06 | 华为技术有限公司 | Light splitting method and related equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779440A (en) * | 2019-10-12 | 2020-02-11 | 浙江大学 | Polarization insensitive photosensitive switch based on Mach Zehnder interferometer structure |
| CN111211844A (en) * | 2020-04-20 | 2020-05-29 | 北京中创为南京量子通信技术有限公司 | Quantum key receiving chip and device |
| CN115576114A (en) * | 2021-10-29 | 2023-01-06 | 华为技术有限公司 | Light splitting method and related equipment |
| CN115576114B (en) * | 2021-10-29 | 2023-07-14 | 华为技术有限公司 | Light splitting method and related equipment |
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Application publication date: 20180330 |