基于二维光子晶体高对比度的快速全光4×2编码器

Fast All-Optical 4×2 Encoder with High Contrast Based on Two-Dimensional Photonic Crystal

基于二维光子晶体波导与微腔的耦合特性,提出了一种全光4×2编码器。该编码器通过在Y型波导中引入微腔实现了高对比度的快速编码功能。利用平面波展开法(PWM)和时域有限差分(FDTD)法对所提4×2编码器性能进行了研究。研究结果表明,所提编码器在1.55μm的工作波长下,对比度高达24.55 dB,响应时间不超过1.11 ps,数据传输速率不低于0.90 Tbit/s,尺寸约为147.45μm^(2)。所提编码器结构简单、对比度高、响应速度快、集成容易,有望在光通信和集成光路领域发挥重要作用。

Based on the coupling characteristics of waveguide and microcavity in two-dimensional photonic crystals,an all-optical 4×2 encoder is proposed.The encoder realizes a high-contrast fast encoding function by introducing a microcavity into the Y-shaped waveguide.The performance of the proposed 4×2 encoder is studied by using plane wave method(PWM)and finite-difference time-domain(FDTD)method.The results show that the proposed encoder has a contrast ratio up to 24.55 dB,a response time not exceeding 1.11 ps,a data transmission rate not less than 0.90 Tbit/s,and a size of about 147.45μm^(2) at a working wavelength of 1.55μm.The proposed encoder has simple structure,high contrast,fast response speed,and easy integration,which is expected to play an important role in the fields of optical communications and integrated optical circuits.