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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10 Gbit/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.
A novel all-optical logic gate based on nonlinear polarization rotation (NPR) in high-nonlinearity fiber (HNLF) is proposed.The two non-return-to-zero data signals A and B and one direct current are simultaneously injected into HNLF Nonlinear birefringence due to optical power variation introduces a nonlinear relative phase shift between the two polarization components, resulting in a polarization state rotation of the optical signal.At the HNLF output, the wavefront demultiplexer and the polarization beam splitter are simultaneously filtered Data signal and the orthogonal polarization state of the direct light, so as to achieve a variety of basic combinational logic at the same time, and in the same section of HNLF to achieve more complex semi-adder, semi-decimator logic function.Analysis of the signal light in HNLF Polarization state evolution and the principle of using NPR effect in HNLF to realize a variety of all-optical logic gates at the same time.And 10 Gbit / s all-optical signal “and ”, “not ”, or Logic functions like “”, “Exclusive OR ”, “AB ”, “AB, ”, half adder and half subtracter verify the feasibility of the program .