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Research On Chracteristics And Design Of Photonic Crystal Modulator

Posted on:2015-03-31Degree:MasterType:Thesis
Country:ChinaCandidate:Y H ZhangFull Text:PDF
GTID:2298330467962075Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
Electro-optic modulator is one of the key components of the optical communicating system. And it has been widely applied in the optical communication, optical computing, optical integration and optical information processing system, etc. Photonic crystal is new material with periodic spatial variations of refract index. Waveguides based on photonic crystal are ultra-compact and low-cost which are easy to be integrated. The electro-optic modulator based on photonic crystal waveguide is promising to apply into the future optical communicating system where modulators must be ultra-compact and low-cost and easily integrated. Thus, it’s significant to do research on the characteristic and application of the electro-optic modulator based on photonic crystal waveguide. In this paper, we mainly study the slow-light MZI electro-optic modulator based on photonic crystal. The main work and results are as following.Firstly, we study the electro-optic effect and slow-light theory of photonic crystal waveguides. Indeed, the modulating theory of the electro-optic modulator is analyzed. Finally we propose the modulating theory of the electro-optic modulator based on photonic crystal and it is the base theory of the coming analysis and design of photonic crystal electro-optic modulator.Secondly, we study the photonic crystal splitter-combiner based on the integration of the Y structure and waveguide bends, which is of high performance. The influence of holes around the corner of the Y structure and waveguide bends on the performance of the two structures or the splitter-combiner is simulated. According to the simulation, the normalized transmission of the optimized1×2power splitter reached above40%in the broadband range from1498.2nm to1601.5nm and the combining efficiency of the2×1combiner is obtained above85%in the same broadband range of the splitter.Finally, the slow-light MZI electro-optic modulator based on monolithic integrated lithium niobate (LiNbO3) photonic crystal (PC) is studied. Taking use of the electro-optic theory, the integrated lithium niobate (LiNbO3) photonic crystal modulator consists of four parts:the splitter, combiner, slow-light waveguide and step taper. It’s the first time that a monolithic photonic crystal modulator of low driving voltage and high modulating bandwidth is proposed. According to the simulations, we finally realize an integrated modulator embedded in a monolithic photonic crystal. The device whole length is91.59um, the half-wave drive voltage is as small as0.66V and the high modulation bandwidth can achieve up to100GHz in theory. Besides, the modulator covers over22.3nm optical bandwidth at telecom wavelength range. The MZI modulator can be widely employed in on-chip optical interconnect applications and integrated devices especially those based on photonic crystal.In conclusion, the research work provides a novel method to design photonic crystal electro-optic modulator. And they are significant theatrical basis and references in the research of future compact photonic integrated circuits...
Keywords/Search Tags:photonic crystal waveguide, electro-optic modulator, optical integration, splitter-combiner, photoniccrystal slow-light
PDF Full Text Request
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