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Design on Electro-optical Tunable ROADM Based on Lithium Niobate Waveguide

Author: LiKeJia
Tutor: JinJie
School: Tianjin University
Course: Electromagnetic Field and Microwave Technology
Keywords: Reconfigurable OADM Lithium niobate waveguides Electro-optical tuning Sidelobe suppression Polarization conversion
CLC: TN929.1
Type: Master's thesis
Year: 2008
Downloads: 81
Quote: 1
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Abstract


Dynamic configuration capabilities with reconfigurable OADM (ROADM) is from the current wavelength division multiplexing optical network (WDM) systems to all-optical network in the evolution indispensable key node devices, optical networking. \smart \and can dynamically adjust the node's drop channel wavelengths, enabling dynamic reconfiguration of optical networks, optical networks greatly accelerate the process transparent and intelligent. Most of the existing ROADM technology Discrete-optical devices, high cost, poor reliability, is not conducive to integration, in addition to the tuning means to limitations in high-speed network applications Pianman response problems exist. ROADM optical network to meet the requirements of the device, this paper proposes a novel electro-optical tunable reconfigurable optical add-drop multiplexer. The device is the titanium diffused lithium niobate waveguide structure, the optical path portion by the polarization conversion section (PCS) and two polarization beam splitters (PBS), of which the PCS by a plurality of polarization conversion unit (PCU) and a plurality of wavelength tuning unit (WTU) are alternately arranged on the waveguide composition. Device uses electro-optical grating polarization conversion, electro-optic effect simultaneously achieve wavelength tuning. In this paper from the waveguide optics, optoelectronics, and mode coupling theory basic principles deduced the various parts of the device parameters on device performance. Based on this, the device of the physical and geometrical parameters are calculated, designed for use in the device of titanium LiNbO3 waveguide preparation parameters, PBS waveguide parameters, PCS each waveguide parameters, PCU, and an electrode structure and the WTU the applied voltage. Finally, this paper also the voltage of each PCU distribution of a variety of improvements to accommodate the pass bandwidth for ROADM, and other indicators sidelobe suppression requirements. And this paper also gives several simpler design alternatives, suitable for reconfigurable lower requirements. The theoretical analysis and simulation studies show that this thesis designs ROADM, high integration, fast response, passband width narrow and low crosstalk. And can not change the device structure under the conditions of the passband width is adjustable to meet different channel spacing DWDM system requirements, but also to achieve the adjacent channel at the same time to download.

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