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使用脉宽为1.6ps的脉冲光抽运0.6m长的光子晶体光纤,测量由光纤中自发四波混频过程所产生光子对的频谱,并利用所获得的相位匹配数据确定了待测光纤的色散。当抽运光的中心波长以1nm的步长,在1037～1047nm的范围内变化时,通过可调谐滤波器和单光子探测器测量光子晶体光纤产生的信号和闲频光子对的频谱,从而获得11组四波混频相位匹配数据。然后使用阶跃有效折射率模型对所获得的相位匹配数据进行拟合,得出待测光子晶体光纤的纤芯半径和包层空气比的有效值分别为0.949μm和29.52%,并在此基础上计算了光纤的色散及全频谱范围内的四波混频相位匹配曲线。实验结果显示,曲线预测值与实测值之间误差小于0.1%。
The pulse width of 1.6ps pulsed light pumping 0.6m long photonic crystal fiber, measured by the optical fiber spontaneous four-wave mixing process generated by the photon pair spectrum, and use the obtained phase matching data to determine the fiber under test Dispersion. When the central wavelength of the pump light is varied in the range of 1037 to 1047 nm in steps of 1 nm, the spectrum of the photon crystal fiber generated signal and idler photon pair is measured by a tunable filter and a single-photon detector to obtain 11 sets of four-wave mixing phase matching data. Then, the phase matching data obtained from the step effective refractive index model were fitted to obtain the effective values of the core radius and the cladding air ratio of the tested photonic crystal fiber were 0.949μm and 29.52% On the calculation of the dispersion of the fiber and the full spectrum of the four-wave mixing phase matching curve. The experimental results show that the error between the predicted value and the measured value is less than 0.1%.