| Wavelength Converter Based on Linearly Chirped Gratings in Lithium Niobate Through Cascaded Second—Order Processes |
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| 作者姓名： | 高士明 杨昌喜 金国藩 |
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| 作者单位： | StateKeyLaboratoryofPrecisionMeasurementTechnologyandInstruments,TsinghuaUniversity,Beijing100084 |
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| 摘 要： | We report a wavelength converter based on linearly chirped gratings in a lithium niobate crystal through cascaded second-order nonlinear processes. The influence of the chirp coetficient on the conversion bandwidth and the efficiency is analysed. The exact phase matching point is optimized at the 0.33 times of the waveguide total length. When the waveguide length is 3 cm, the bandwidth of the linearly chirped grating increases 42% with the etficiency penalty of 1.7dB compared with the periodic grating. At the same mean conversion etficiency of- 1.4 dB via adjusting the waveguide total lengths, the bandwidth of the linearly chirped grating is 36% broader than the periodic grating.
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| 关 键 词： | 线性啁啾光栅 铌酸锂 WDM 波分复用系统 光通信 波长变换 级联二次过程 |
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