Analysis of Ti:LiNbO₃ zero-gap directional coupler for wavelength division multiplexer/demultiplexer

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• 作者：Pranabendu Ganguly ; Juran Ch ; ra Biswas ; Samir Kumar Lahiri
• 关键词：Zero-gap directional coupler ; Wavelength division multiplexer/demultiplexer ; Effective-index based matrix method ; Ti ; LiNbO₃ waveguide
• 刊名：Optics Communications
• 出版年：2008
• 期刊代码：50_00304018
• 类别：ph
• 出版时间：15 June 2008
• 卷：281
• 期：12
• 页码：3269-3274
• 文件大小：193 K

摘要

For the purpose of multichannel integrated-optical wavelength division MUX/DEMUX design, the wavelength tuning method of Ti:LiNbO₃ zero-gap directional coupler is analysed by effective-index based matrix method (EIMM). In this method, first, the 2D refractive index profile of the Ti:LiNbO₃ zero-gap directional coupler is transformed into lateral 1D effective-index profile by WKB method. Finally, matrix method is applied to this effective-index profile and the propagation constants are computed from the resonance peaks of the excitation efficiency versus propagation constant characteristics. It has been shown that the channel wavelength tuning can be achieved by varying the Y-branching angle at the input and output of the device or by a slight variation of two-mode-section length. The method of electro-optic fine tuning of the channel wavelength and channel separation of the device has also been investigated. A cascaded structure with proper parameters for four-channel application is also simulated and the results are presented.