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Design on Polarizing Beam Splitter (PBS) of ROADM

Author: XuJianLei
Tutor: JinJie
School: Tianjin University
Course: Electromagnetic Field and Microwave Technology
Keywords: Ti diffusion Lithium niobate polarization mode coupling beamsplitter
CLC: TN929.1
Type: Master's thesis
Year: 2010
Downloads: 103
Quote: 1
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Abstract


Reconfigurable OADM (ROADM) existing WDM networks is to achieve all-optical network process towards a key node device which can not only signals from the multi- wavelength line to the local download of a specific wavelength , the most important is a dynamically reconfigurable capacity, accelerate the process of intelligent optical networks . Polarization beam splitter and the polarization conversion unit constitute the entire ROADM devices, integrated polarization beam splitter (PBS) or the role of separating TE and TM modes merge , so as to meet the performance requirements of ROADM device , designed in this polarization beam must have high extinction ratio, high transmittance characteristics. Most of the existing technology in PBS fiber or waveguide -based devices, the yield is low , the extinction ratio is low, poor controllability , is not conducive to integration. To meet the new optical network polarization beam splitter requirements, the paper proposes a Ti based on LiNbO3 waveguide polarization beam splitter . The device uses Ti diffused lithium niobate waveguide structure , the use of two coupled arm mode coupling will separate TE and TM modes , respectively output from the output port . This paper analyzes the polarization beam splitter from the lithium niobate crystal birefringence , optical effect such theory, discussed two common LiNbO3 waveguide production method , in particular during the thermal diffusion of Ti influence the effect of the polarization beam splitter parameters. On this basis , the paper using the mode coupling theory to design two structures deduced polarization beam splitter theoretical model to calculate the polarization beam splitter splitting conditions , determine the device waveguide geometry and waveguide fabrication parameters. Finally, for the polarization beam splitter can not precisely control the spread of the production process after the extinction ratio and refractive defects and poor , raised an electrode optimal design and demonstrate its feasibility. The simulation results show that the thesis of a polarization beam splitter , high integration, high extinction ratio , and low transmission loss . And can not change the configuration of the device under the conditions of the extinction ratio is adjustable, controllable refractive index difference .

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