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基于高非线性光纤中非线性偏振旋转效应的、全光逻辑门研究
All-optical logic gates based on nonlinear polarization rotation in high nonlinear fiber
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摘要: 提出了一种新型的基于高非线性光纤（HNLF）中非线性偏振旋转（NPR）效应的全光逻辑门实现方案．将两路非归零码数据信号A和B以及一路直流光同时注入HNLF,光功率变化导致的非线性双折射在两个偏振分量上引入非线性相对相移，从而导致光信号的偏振态旋转．在HNLF输出端，通过波分解复用器和偏振分束器同时滤出数据信号和直流光的正交偏振态，从而同时实现多种基础组合逻辑，并可以在同一段HNLF中实现较为复杂的半加器、半减器逻辑功能．理论分析了信号光在HNLF中的偏振态演化，以及利用HNLF中的NPR效应同时实现多种全光逻辑门的原理．并在实验中得到了10Gbit／s全光信号“与”、“非”、“或”、“同或”、“异或”、“A．B”、“A．B”、半加器、半减器等逻辑功能，验证了方案的可行性．Abstract: A novel scheme to realize all-optical logic gates is proposed based on nonlinear polarization rotation （NPR） in high nonlinear fiber （HNLF）. Two optical signals A and B together with a continuous wave are injected into the HNLF. Due to the optical power variation in HNLF, nonlinear birefringence will be induced between the two polarization axes. Both the optical signal and the continuous wave are filtered out at the output of HNLE By controlling the optical power and the polarization of the optical signal as well as the polarization of the polarizer with respect to the polarization of optical signal/continuous wave, multiple all-optical logic gates can be realized. The theoretical analysis of the optical logic gates based on NPR in HNLF is provided. And the feasibility of the scheme is demonstrated by realizing all optical ＂and＂, ＂not＂, ＂or＂, ＂xor＂, ＂nxor＂, ＂A. B＂, ＂A. B＂, half-adder and half-subtracter at 10 Gbit/s operation.
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