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研究了基于周期极化反转铌酸锂光波导级联二阶非线性效应实现非归零码到归零码高速全光码型转换的新方案,使用的是马赫-曾德尔干涉仪结构.转换原理是非归零码信号光在级联倍频和差频过程中受到的放大作用引起马赫-曾德尔干涉仪的不平衡,进而通过干涉相消产生归零码信号光输出.首先从耦合波方程出发,数值模拟了非归零码到归零码码型转换过程.然后分析了波导长度、光功率、相对时延对消光比的影响并对码型转换进行了优化设计.最后分析了转换带宽,模拟计算表明信号光在90nm的3dB带宽内可调谐,进而可以实现多信道的同时转换.
The new scheme of non-return-to-zero-to-zero-code high-speed all-optical code conversion based on the second-order nonlinearity of the periodically poled lithium niobate optical waveguide cascades is studied. The Mach-Zehnder interferometer structure is used. Conversion principle is that the non-return-to-zero signal light is amplified in the process of cascade frequency multiplication and difference frequency to cause the imbalance of Mach-Zehnder interferometer, and then the zero-output signal light output is produced by the interference cancellation. Equation, the numerical simulation of the non-return to zero-to-zero code pattern conversion process.And then the influence of waveguide length, optical power, relative delay on extinction ratio is analyzed and the pattern conversion is optimized.Finally, Bandwidth and analog calculations show that the signal light is tunable within a 3dB bandwidth of 90 nm, allowing simultaneous conversion of multiple channels.