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Organic polymer electro-optic modulators optimize design

Author: LiWuJun
Tutor: ZhangXiaoXia
School: University of Electronic Science and Technology
Course: Optical Engineering
Keywords: Electro-optic modulator Organic polymer Effective refractive index Y branch Coplanar waveguide
CLC: TN761
Type: Master's thesis
Year: 2010
Downloads: 79
Quote: 1
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Abstract


The electro - optic modulator in the optical fiber communication system plays a more critical role . This paper introduces the trends and development in the world of organic polymer electro-optic modulator , then starting from the physical mechanism of modulation characteristic parameters of the structural characteristics of the electro-optic modulator , and optical waveguide and electrode depth research . Starting from the planar optical waveguide theory , conducted a theoretical analysis of the transmission mode of the optical waveguide . Combining the advantages of the organic polymeric material , the use of an effective refractive index method using the Matlab language for the organic polymer ridge waveguide conducted a theoretical analysis and modeling simulation : each of the optical waveguide core layer thickness of the organic polymer , the ridge height , ridge width for the variable , the mode field in the different waveguide dimensions were simulated , and a detailed analysis of the impact of changes in these parameters on the effective refractive index to obtain the conditions of the ridge waveguide is single - mode transmission of the organic polymer . Combined with the optical emulation software OptiBPM Analyzer this optical field distribution of the waveguide structure simulation, the simulation results for single-mode transmission and the central area of the light field is limited in the ridge area . Departure from the approximate model of the structure of the Y branch , cosine bend Y-branch waveguide theoretical analysis and modeling and simulation using the beam propagation method . Analysis of the loss of the Y-branch waveguide and the branch height and width of the waveguide , the change in relationship between the length of the transition zone . Then in OptiBPM Analyzer software cosine curved Y-branch waveguide model and simulation , and ultimately get the optimal parameter values ??of a Y- branch waveguide structure . The final design of a new electrode structure, both the traditional advantages of coplanar waveguide electrode coplanar waveguide and buried - type electrodes . I.e. , while improve the electro-optical effect , but also makes the transition region electrode easy to design. Second, to analyze the influence of the characteristics of the interaction region electrode impedance, the loss, the influencing factors of the half-wave voltage . Finally, the transition mode of the three different structures of the comparative analysis, derived using elliptic segment transition mode can be made smooth transition electrodes , serials , and has been an elliptical segment transition mode modulator 3dB bandwidth value .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Modulation technique and the modulator,demodulator and the demodulator > Modulation technique and the modulator
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