全混洗变换的光学实现方法

Optical implementation method of perfect shuffle transformation

在有关文献对全混洗讨论的基础上,补充、完善了左逆混洗、右混洗和右逆混洗的研究。针对目前已经采用的实现左混洗变换方法的不足,提出了利用微光学衍射元件(微闪耀光栅阵列)实现全混洗变换的方法。通过对微闪耀光栅阵列周期参数的确定,可以控制信号光在空间闪耀输出的方向和闪耀角的大小。利用反应性离子刻蚀技术制得了1×8的微闪耀光栅阵列,成功地实现左混洗变换,该方法同样可以实现左逆混洗、右混洗和右逆混洗变换。实验结果表明,与其它实现方式相比,该方法具有器件尺寸小、衍射效率高(理论上衍射效率可达到95%左右)、光路简便易行、易微型化和集成化等特点,能够用于多级互连构建全混洗光互连网络。

In order to use optical methods and optical elements to implement perfect shuffle, a perfect shuffle transformation method using micro-blazed grating array was proposed. The left inverse perfect shuffle, right perfect shuffle and the right inverse perfect shuffle are discussed complementally based on some reports on left perfect shuffle in previous papers. According to the different grating period values, a 1 × 8 micro-blazed grating array element for realizing 8-channel left perfect shuffle transformation is fabricated with Very Large Scale Integration （VLSI）, stepping photolithography and Reactive Ion Etching （RIE）. Similarly, depending on the micro-blazed grating array with different period values, the left inverse perfect shuffle, right perfect shuffle and the right inverse perfect shuffle transformation also can be accomplished. Experimental results show obviously that, comparing with con- ventional methods, it has advantages of small size, compact structure, easy to integrate, high diffraction efficiency （95% or so in principle）, and high performance. Thus, it should be helpful in constructing multistage perfect shuffle interconnection network.