中国激光, 2011, 38 (s1): s117001, 网络出版: 2012-01-06
基于周期性极化铌酸锂的偏振相关全光逻辑门
Polarization-Based All-Optical Logic Gates Employing Electro-Optic Effect in Periodically Poled LiNbO3
光电子学 全光逻辑门 电光调制 周期性极化铌酸锂 optoelectronics all-optical logic gates electro-optic modulation periodically poled lithium niobate (PPLN)
摘要
基于周期性畴反转铁电材料铌酸锂的电光效应,提出一种利用电光Pokels效应调制偏振态的二进制全光逻辑处理方案并进行了实验验证。当以偏振方向相互正交的两种线偏振光,分别表示光信号1的逻辑0和逻辑1时,信号光的偏振方向在一定的外加电场作用下,将在偏振面内旋转90°,从而实现两种偏振态即逻辑0和逻辑1的相互转换。在不加外电场的情况下,信号光的偏振方向不产生明显变化,从而实现可控逻辑非的功能。当以外加电场的电平信号来表示电信号2的逻辑0和逻辑1时,还能实现异或和同或的逻辑功能。相比于强度编码的方案,该偏振编码的方案对于信号的损耗很小,因此能够更方便地应用于多重级联系统,从而实现更复杂的逻辑功能。
Abstract
A simple approach based on polarization to process binary all-optical logic signal with validation is proposed, by electro-optic Pokels effect. In experiment, we choose optical signal with two orthogonal linear polarization states to present logic 1 and 0. This approach can alter the polarization state of input optical signal about 90°on the polarization plane based on electro-optic modulation of periodically poled lithium niobate (PPLN). Optical signal can be switched between the two orthogonal polarization states, and polarization direction will be not changed without external applied electric field. Therefore, it can realize controllable-NOT function. If we choose external applied electric field to present logic 1 and 0, it can realize NOR and XNOR functions. In this approach, digital logic signal is carried on the polarization state of optical signal. The dissipation of intensity of optical signal is very small in this process, so this approach is more advantageous for multiply cascaded systems ,comparing with traditional approach ,in which digital logic signal is carried on the intensity of optical signal.
张寅星, 陈玉萍, 陈险峰. 基于周期性极化铌酸锂的偏振相关全光逻辑门[J]. 中国激光, 2011, 38(s1): s117001. Zhang Yinxing, Chen Yuping, Chen Xianfeng. Polarization-Based All-Optical Logic Gates Employing Electro-Optic Effect in Periodically Poled LiNbO3[J]. Chinese Journal of Lasers, 2011, 38(s1): s117001.