Waveband-shift-free optical phase conjugator based on difference-frequency generation.
Waveband-shift-free optical phase conjugator based on difference-frequency generation.
复制标题
基于差频生成的无波带漂移光学相位共轭器。
作者：
Y. Okamura;A. Takada
本文提出了一种基于差频产生的无波段漂移光学相位共轭器（DFG-OPC），并对其进行了理论研究。首先，从数学上描述了DFG-OPC产生相位共轭（PC）波的原理。使用具有χ（2）光学非线性材料和两个色散元件（DE）的Sagnac环形干涉仪，可以产生与信号具有相同波长的PC波。随后，从理论上计算PC波产生所需的DE长度差。计算结果表明，由于DFG-OPC实现了宽带工作，最小DE长度差为20.0 μm。其次，通过数值模拟研究了DFG-OPC的波长特性。DFG-OPC的工作带宽取决于DE长度差，并且当DE长度差小于0.01 m时，DFG-OPC的工作带宽可以达到54.5 nm。最后，数值研究了DFG-OPC中3 dB光耦合器分光比的影响。结果表明，DFG-OPC的光耦合器分光比容差≤ ±6%。
In this paper, a waveband-shift-free optical phase conjugator based on difference-frequency generation (DFG-OPC) that enables broadband operation is proposed and theoretically investigated. First, the principle of phase-conjugated (PC) wave generation with the DFG-OPC is mathematically described. Using a Sagnac loop interferometer with a χ(2) optical nonlinear material and two dispersive elements (DEs), a PC wave with the same wavelength as a signal can be generated. Subsequently, the required DE length difference for the PC wave generation is theoretically calculated. The calculation results indicate the minimal DE length difference is 20.0 μm, and this is because the DFG-OPC enables broadband operation. Second, the wavelength characteristics of the DFG-OPC are investigated through numerical simulation. The operation bandwidth of the DFG-OPC depends on the DE length difference, and an operating bandwidth of the DFG-OPC of 54.5 nm can be achieved when the DE length difference is less than 0.01 m. Finally, the influence of the splitting ratio of an optical 3-dB coupler in the DFG-OPC is numerically studied. The results indicate that tolerance of the optical coupler splitting ratio is equal to or less than ±6% for the DFG-OPC.
影响因子：
3.6
作者：
Giacoumidis, Elias;Le, Son T.;Eggleton, Benjamin J.
通讯作者：
Eggleton, Benjamin J.
影响因子：
4.7
作者：
Ellis, Andrew D.;Tan, Mingming;Bayvel, Polina
通讯作者：
Bayvel, Polina