CN101980070A - Multilayer dielectric waveguide modulator design - Google Patents
Multilayer dielectric waveguide modulator design Download PDFInfo
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- CN101980070A CN101980070A CN2010102808490A CN201010280849A CN101980070A CN 101980070 A CN101980070 A CN 101980070A CN 2010102808490 A CN2010102808490 A CN 2010102808490A CN 201010280849 A CN201010280849 A CN 201010280849A CN 101980070 A CN101980070 A CN 101980070A
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Abstract
The invention discloses a multilayer dielectric waveguide modulator design, belongs to the technical field of optical communication, and relates to integrated optics and the technology of optical waveguides. In the design, a ridge type optical waveguide structure is designed by utilizing an organic polymer with a lower dielectric constant and a higher electro-optical coefficient, which meets single-mode transmission conductions. In the design, a novel structure of a multilayer dielectric waveguide is formed by adding a dielectric layer above the electrode of a conventional polymer modulator by a Wheeler transformation method; and the simultaneous matching of rate and impedance is realized by modulating by using a microstrip electrode.
Description
Technical field
Based on the design of multilayered medium waveguide modulator, belong to the optical communication technique field, relate to integrated optics and optical waveguide technique.
Background technology
The characteristics of electrostrictive polymer photomodulator are exactly that modulation rate is big, modulating frequency is high, driving voltage is low and are cheap, although also obtain large-scale commercial the application, its potential range of application is very extensive.Along with developing rapidly of technique of internet, people are more and more higher for the bandwidth requirement of communication network, especially requirement can transmit the pressure that multimedia service has more increased the weight of the network communication bandwidth in real time, the multimedia service of the band image request of for example desk-top video conference, suitable commerce and teaching purpose forms the requirement that increases by index to remote communication network bandwidth.At 1.3 microns and 1.55 microns communication windows, the potential bandwidth ability of a single-mode fiber is 10THz, and the bandwidth of Erbium-Doped Fiber Amplifier (EDFA) (EDFA) flat response also can reach several THz magnitudes, so the bottleneck of communication is in the conversion of electro-optical signal.In addition from the transfer rate of the present communication system of transfer rate several to tens GHz/s, require the transfer rate of Tbit/s magnitude in the near future.And the characteristics of the high speed of electrostrictive polymer photomodulator, broadband, low driving voltage make it be particularly suitable for the switching etc. of the conversion of electro-optical signal in the long-distance key communication network of modern high speed high capacity, light path, shown in Fig. 1 .1.And the electrostrictive polymer photomodulator of Mach-Zehnder structure do not have frequency chirp, thereby is particularly suitable for wdm system yet.Therefore the electrostrictive polymer photomodulator will become one of most important hardware of following information highway.
Along with the develop rapidly of the communication technology, especially in the microwave light communications field, the increase of signal frequency, modulator must have characteristics such as high speed, wide bandwidth, low-loss.The essence of microwave light modulation is that microwave electric field causes that the electric induced refractive index of optical waveguide material changes, and the variation that will produce phase place, amplitude or frequency during the waveguide of light field process realizes the optical modulation of microwave signal.Microwave is that optical waveguide equates the refractive index that microwave and light wave presented with the interactional ideal conditions of light wave, promptly reaches rate-matched.Use at present and be based on LiNbO more widely
3The modulator that crystalline material is made, LiNbO
3Specific inductive capacity Deng organic material is bigger, has intrinsic speed mismatch in the inorganic waveguide between microwave and light wave frequency range, has limited bandwidth.The main direction of studying of electrostrictive polymer photomodulator is how to increase modulation band-width, and the principal element that influences modulation band-width is whether the speed of light carrier can be complementary with the speed of microwave, and the impedance of device simultaneously can be approximated to be 50 desirable Ω.The method of traditional adjustment rate-matched mainly is that the structure to modulator is optimized design, comprises the design of waveguiding structure and the design of electrode.
Summary of the invention
The subject matter that the present invention will solve is to adopt to add one deck layer of compensation above traditional microstrip line electrode, form a kind of new multilayer waveguide structure, select appropriate layer of compensation material, the thickness of suitable adjustment layer of compensation, make its electrostrictive polymer photomodulator can reach the rate-matched and the impedance matching of microwave and light wave simultaneously, to realize high-speed electro-optic modulator with ultra broadband characteristic.
This method at first uses Effective Index Method that the three-dimensional structure of ridge waveguide is designed, and utilizes the electrode of Wheeler transfer pair sandwich construction to analyze design again.Adopt organic polymer CLD-1/APC as electrooptical material, refractive index is 1.612 during λ=1.55 μ m, and the microwave frequency band specific inductive capacity is 3.0; The top covering material is UFC-170, and refractive index is 1.488 during λ=1.55 μ m, and specific inductive capacity is 2.5; The under-clad layer material is UV-15, and refractive index is 1.504 during λ=1.55 μ m, and specific inductive capacity is 2.5; Backing material is SiO
2
The design process of ridge waveguide and micro-strip electrode is as follows:
1. in conjunction with Effective Index Method and single mode transport condition, different ridge height, ridge is wide and the core material thickness condition under, calculate the light wave effective refractive index, investigate its variation range;
2. utilize the electrode of Wheeler transfer pair sandwich construction to analyze, different electrode widths, thickness of electrode and add under the thickness of layer of compensation, calculate the effective refractive index of microwave, investigate its variation range;
3. integrating step 1 and 2 result obtain one group of structural parameters that the light wave effective refractive index is identical with the microwave equivalent refractive index.
Beneficial effect of the present invention:
1. realized the rate-matched of the light velocity and microwave.
2. realize that the micro-strip electrode impedance is near ideal value 50 Ω.
Description of drawings
Fig. 1: the sectional structure chart of multilayered medium waveguide modulator, 1 rate compensation layer, 2 top coverings, 3 sandwich layers, 4 under-clad layers, 5 substrates, 6 upper strata micro-strip electrodes, 7 ground electrodes
Embodiment
What the present invention proposed is a kind of based on the design of multilayered medium waveguide modulator, and its structure as shown in Figure 1.Top covering 2 materials are generally UFC-170, and the intermediate core layer material is generally CLD-1/APC, regulate the ridged size and make waveguide be operated under the single mode condition, and under-clad layer 4 materials are generally UV-15, and SiO2 is generally adopted in substrate, and electrode material generally adopts Au.When not having 1 layer of rate compensation layer, according to the electrode simulation result, characteristic impedance can reach the scope near 50 Europe, but the microwave equivalent refractive index is also much smaller than the light wave effective refractive index, that is to say that impedance matching can reach, but also do not reach the target of rate-matched.In order to reach speed and impedance matching simultaneously, micro-strip electrode is done an improvement, on top electrode, add one deck rate compensation layer.
Transferred microwave signal to be loaded on the upper electrode 6, the modulated light wave signal is had an effect in their overlapping region along waveguide core layer 3 transmission, produces modulation signal.When on top electrode, adding one deck rate compensation layer, can realize the coupling of microwave effective refractive index and light wave effective refractive index, thereby realize the electrooptic modulator of two-forty wide bandwidth by adjusting its microwave equivalent refractive index.
Claims (5)
1. multilayered medium waveguide modulator design comprises the ridge waveguide structure, the multilayered medium waveguiding structure, and the micro-strip electrode structure is characterized in that the coupling of the speed of light wave and microwave, impedance matching.
2. multilayered medium waveguide modulator design according to claim 1 is characterized in that the ridge waveguide structure satisfies the single mode transport condition.
3. multilayered medium waveguide modulator design according to claim 1 is characterized in that the microwave effective refractive index of multilayer waveguide structure is identical with the effective refractive index of light wave.
4. multilayered medium waveguide modulator according to claim 1 design, it is 50 Ω that the micro-strip electrode structure that it is characterized in that the multilayered medium waveguide satisfies characteristic impedance.
5. according to claim 1,2,3,4 described multilayered medium waveguide modulator designs, it is characterized in that satisfying under the condition of single mode transport, the effective refractive index of light wave equals the effective refractive index of microwave, promptly realizes the rate-matched of light and microwave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102808490A CN101980070A (en) | 2010-09-14 | 2010-09-14 | Multilayer dielectric waveguide modulator design |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102808490A CN101980070A (en) | 2010-09-14 | 2010-09-14 | Multilayer dielectric waveguide modulator design |
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| CN101980070A true CN101980070A (en) | 2011-02-23 |
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| CN2010102808490A Pending CN101980070A (en) | 2010-09-14 | 2010-09-14 | Multilayer dielectric waveguide modulator design |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749800A (en) * | 2013-12-27 | 2015-07-01 | 华为技术有限公司 | Modulator and optical module |
| CN110618489A (en) * | 2018-06-20 | 2019-12-27 | 云晖科技有限公司 | Optical mode converter for coupling between waveguides having different mode sizes |
-
2010
- 2010-09-14 CN CN2010102808490A patent/CN101980070A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749800A (en) * | 2013-12-27 | 2015-07-01 | 华为技术有限公司 | Modulator and optical module |
| CN110618489A (en) * | 2018-06-20 | 2019-12-27 | 云晖科技有限公司 | Optical mode converter for coupling between waveguides having different mode sizes |
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Application publication date: 20110223 |