Wang Qing, Yao Jianping
Microwave Photonics Research Laboratory, School of Information Technology and Engineering, University of Ottawa, ON K1N 6N5, Canada.
Opt Lett. 2008 May 1;33(9):1017-9. doi: 10.1364/ol.33.001017.
An approach to all-optical bipolar direct-sequence ultrawideband (UWB) encoding for multiple access communications is proposed and demonstrated. The bipolar coding is performed based on electro-optic phase modulation and phase modulation to intensity modulation (PM-IM) conversion in a fiber Bragg grating (FBG) array that serves as a multichannel frequency discriminator. The chip number and the chip period of the code are determined by the number of FBGs and their physical separation. By locating the optical carriers that carry a Gaussian pulse at the left or right slopes of the FBG reflection spectra, bipolar direct-sequence UWB codes are generated. A bipolar UWB coding system with a code length of 4 is experimentally demonstrated.
提出并演示了一种用于多址通信的全光双极性直接序列超宽带（UWB）编码方法。双极性编码是基于电光相位调制以及在用作多通道鉴频器的光纤布拉格光栅（FBG）阵列中的相位调制到强度调制（PM-IM）转换来执行的。码的码片数和码片周期由FBG的数量及其物理间距决定。通过将携带高斯脉冲的光载波定位在FBG反射谱的左斜率或右斜率处，生成双极性直接序列UWB码。实验演示了一种码长为4的双极性UWB编码系统。
