Picosecond and femtosecond asymmetric switching using a semiconductor optical amplifier-based Mach-Zehnder interferometer

Khorrami Yaser; Ahmadi Vahid; Razaghi Mohammad; Das Narottam

摘要

In this paper, we numerically analyze nonlinear asymmetric switching using a semiconductor optical amplifier (SOA) phase-shifter-based Mach-Zehnder interferometer (MZI), for the first time, to the best of our knowledge. The self-phase modulation (SPM) effect and nonlinear phase shift in each MZI arm are investigated for different input pulse intensities and linear gains in both picosecond and femtosecond regimes. The input light signal is split unequally over the two arms, where SOAs are placed and act as nonlinear phase shifters in each arm. The finite difference beam propagation method is used to solve the modified nonlinear Schrodinger equation to analyze the wave propagation. In this work, the main nonlinear effects in SOA, such as group velocity dispersion, Kerr effect, two-photon absorption, carrier heating, and spectral hole burning, are considered. Furthermore, the effect of SPM on distortion of the pulse shape and its spectrum, which can be used for pulse shaping in a picosecond-switching scheme, is studied. We depicted red and blue shifts that each pulse experiences in the process of switching in picosecond and femtosecond regimes, respectively. Based on the results for sub-picosecond input pulses, by controlling the bias current level in the MZI arms, the pulse distortion due to nonlinear effects of SOAs can be decreased at the switch output port, and symmetric pulse can be obtained. Switching with higher speed is possible in bulk SOAs in the femtosecond regime using asymmetric MZI-switching structure. (C) 2018 Optical Society of America

机译：在本文中，我们首次使用基于半导体光放大器（SOA）相移的Mach-Zehnder干涉仪（MZI）来数值分析非线性不对称切换。研究了每个MZI臂中的自相调制（SPM）效应和非线性相移，用于Pic秒和飞秒制度的不同输入脉冲强度和线性增益。输入光信号在两个臂上不均匀，其中放置SOA并充当每个臂中的非线性相移器。有限差分光束传播方法用于解决修改的非线性Schrodinger方程以分析波传播。在这项工作中，考虑了SOA中的主要非线性效应，例如组速度分散，克尔效应，双光子吸收，载体加热和光谱燃烧。此外，研究了SPM对脉冲形状的变形及其谱的影响，其可用于PICOSECOND切换方案中的脉冲形状。我们描绘了红色和蓝色转变，即分别在PicoSecond和Femtosecond制度切换过程中的每个脉冲体验。基于Sub-PicoSecond输入脉冲的结果，通过控制MZI臂中的偏置电流电平，可以在开关输出端口下减小由于SOA的非线性效应引起的脉冲失真，并且可以获得对称脉冲。使用不对称的MZI开关结构，在飞秒式制度中可以在散装SOA中切换更高的速度。（c）2018年光学学会

Picosecond and femtosecond asymmetric switching using a semiconductor optical amplifier-based Mach-Zehnder interferometer

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