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Theory And Key Technology For Silicon-PLC Based Passive Photonics Integrated Devices

Posted on:2016-08-21Degree:DoctorType:Dissertation
Country:ChinaCandidate:W F JiangFull Text:PDF
GTID:1108330503477533Subject:Physical Electronics
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With the development of mode division multiplexing (MDM) technology, the requests for the planar lightwave circuit (PLC) based photonic integrated circuit (PIC) devices become increasingly higher. Silicon based PIC devices play a key role, for their advantages of low cost, compatible with CMOS process and high stability. This dissertation focuses on the field of silica-on-silicon (SoS) and silicon-on-insulator (SOI) based passive PIC devices, analyzes deeply the impacts on the performance of the devices, including modes, lightwave transmission in the rib waveguides and the core waveguide units, as well as proposes and manufactures novel PLC passive photonic devices.The recent developments of MDM technologies are summarized in the first chapter. Then the research progresses of the PIC are reviewed briefly, including theoretical and numerical methods for the optical waveguide, the fabrication process and coupling technology for the silicon based waveguides and chips. Finally, the objective and main content of this thesis are given.The hidden superposed (HS) mode in the single mode rib waveguide is found and defined in the second chapter. By using effective index method (EIM), the eign equation and mode distribution function are derived and the HS mode characteristics are analyzed, compared by both of EIM and full vectorial finite element method (FV-FEM). The results show the HS mode is the main reason for the mode crosstalk, mode jump and burst loss.The single mode condition for the SoS waveguide is identified. In order to explore the suppressive method and structure on the HS mode, the evolution and interaction process of the HS mode at in/output ports, transmission segments and splitting units are investigated. The linear/nonlinear gradient waveguide, double tapers based mode filter and novel longitudinal/bending Y-branches are proposed and optimally designed. The polarization dependent problems for the SoS waveguide are also investigated.Three kinds of SoS-PLC based mode/polarization/wavelength selective chips are proposed in the fourth chapter, including the HS based multimode interference tunable optical coupler, TE-pass polarizer with cylinder array inserted in the buffer layer and the asymmetric/cascaded MZIs based optical filter, which are optimally designed by using the 2D-FD-BPM.Three silicon based coupling structures, including, the three dimensional superposed coupling structure, the sine grating coupling structure and the waveguide mirror are proposed and optimally designed by using the FE-BPM in the fifth chapter.The fabrication process of the SoS-PLC waveguide and the testing methods for the PLC based passive photonic devices are given in the sixth chapter based on builted the packaging/testing platforms for the strip and the single photonic chip. Finally, the mode characteristics of the HS mode are experimentally investigated, which verify the HS mode inducing the mode crosstalk and mode jump of the rib waveguide.The SoS-PLC based 1×8/16/32 optical splitters are tested in the seventh chapter, and their performances are analyzed according to the request of the national standard. The experiments for the polarization dependent problem are carried out as well as the SoS-PLC based mode/wavelength selective devices are tested and analyzed.
Keywords/Search Tags:Mode Division Multiplexing, Photonic Integration Circuit, Planar Lightwave Circuit, Hidden Superposed Mode, Optical splitter, Tunable Optical Coupler, Optical Polarizer, Tunable MZ based Filter, Coupling Structure
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