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首页> 外文会议>Applications of Photonic Technology: Closing the Gap between Theory, Development, and Application 7C-Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers pt.2 >Comparison of Cascaded χ~((2)) Wavelength Conversions in Quasi-Phase Matched (QPM) Waveguides
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Comparison of Cascaded χ~((2)) Wavelength Conversions in Quasi-Phase Matched (QPM) Waveguides

机译：准相位匹配（QPM）波导中级联χ〜（（2））波长转换的比较

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摘要

Cascaded second-order nonlinear interaction (χ~((2))) based wavelength conversion technique has attracted much attention due to its unique characteristics such as low noise and broadband, which are critical in fiber communication networks. In this report, wavelength conversions based on the newly proposed SFG-DFG (sum frequency generation - difference frequency generation) and conventional SHG-DFG (second harmonic generation - difference frequency generation) are studied and compared both experimentally and theoretically in a LiNbO_3 quasi-phase matched (QPM) waveguide. It is shown that the same conversion efficiency can be achieved by employing two pump sources with only half power each (P_1, P_2) in the SFG-DFG scheme as compared with the SHG-DFG scheme with a single higher power pump beam (P=P_1+P_2). It is shown that the cascaded SFG-DFG based wavelength conversion has a larger 3-dB pump tolerance bandwidth. The theoretical results are consistent well with the experimental ones. It is found that the pump wavelength difference can be separated by a span as large as 75 nm, while 3-dB signal conversion efficiency is retained in a 45 mm-long device. It is also exhibited that tolerance of temperature for the cascaded SFG-DFG remains the same as that of the cascaded SHG-DFG based devices. The results show that the SFG-DFG wavelength conversion scheme is very attractive for practical applications.
机译：基于级联二阶非线性相互作用（χ〜（（2）））的波长转换技术因其独特的特性（如低噪声和宽带）而备受关注，这在光纤通信网络中至关重要。在本报告中，研究了基于新提出的SFG-DFG（总和频率生成-差分频率生成）和常规SHG-DFG（二次谐波生成-差分频率生成）的波长转换，并在理论上和在LiNbO_3准Li-相位匹配（QPM）波导。结果表明，与使用单个高功率泵浦光束的SHG-DFG方案相比，在SFG-DFG方案中采用两个仅具有一半功率的泵浦源（P_1，P_2）可以实现相同的转换效率。 P_1 + P_2）。结果表明，基于级联SFG-DFG的波长转换具有较大的3dB泵浦容限带宽。理论结果与实验结果吻合良好。可以发现，泵浦波长差可以分开长达75 nm的跨度，而在45 mm长的设备中可以保持3 dB的信号转换效率。还显示出级联的SFG-DFG的温度容差与基于级联的SHG-DFG的设备的温度容差保持相同。结果表明，SFG-DFG波长转换方案对于实际应用非常有吸引力。

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