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The Study on Characterisce of Multi-wavegength Phtonic Crsytal Wavelength Division Multiplexers Based Multimode Interference Thoery

Author: JinXiaoJun
Tutor: ChenHeMing
School: Nanjing University of Posts and Telecommunications
Course: Optical Engineering
Keywords: Multi - wavelength wavelength division multiplexing Multimode interference Self-imaging principle Coupling characteristics Plane wave method Finite difference time domain method
CLC: TN929.11
Type: Master's thesis
Year: 2011
Downloads: 58
Quote: 0
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Abstract


In today 's information explosion of social data communication service the growing demand for bandwidth , using WDM technology to expand the capacity of the optical fiber communication system is feasible and widely applied technology programs . Wavelength Division Multiplexing WDM system is the key functional devices , the pros and cons of its performance have a decisive impact on the system transmission quality . Photonic crystal wavelength division multiplexer based on multimode interference theory , not only combines the advantages of the photonic crystal and the technological advantages of the WDM system , it also contains the characteristics of multimode interference coupled device , for the design of the wave of miniaturization and integration the sub- multiplexer provides a new way of thinking . Firstly, the guided mode propagation method analysis of the the multimode coupled system in general interference conditions in self - imaging principle , the input field at the output to the value of a positive image and mirror conditions . Plane wave expansion method and finite difference time domain method simulation , and analysis of the self-imaging effect and coupling characteristics of the light field in the asymmetric incidence of two parallel photonic crystal waveguide coupling system . Simulation results show that decoupling Square Dielectric two parallel cylindrical photonic crystal waveguide coupler system characteristics, and by adjusting some of the structural parameters in the coupled system , the coupling beat length increases or smaller , through comparative analysis , between the two waveguide most obvious the media column radius size of the coupling beat length . Subsequently, the design is based on two-dimensional photonic crystal multimode interference effect of three-wavelength division multiplexing and wavelength division multiplexing , the performance parameters of the device simulation by finite difference time domain method , the results show that the design the two wavelength division multiplexer insertion loss less than 0.2 dB channel isolation is about 15dB , the maximum size of the device structure 37.5μm , with small size , compact structure, easy integration features Concludes with a discussion of the design wavelength division multiplexer in integrated optics and fiber-to-the-home technology .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications > Optical fiber communication
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