基于光纤光参量放大的光脉冲压窄技术的研究

Optical Pulses Compression Based on Fiber-optical Parametric Amplifier

在高重复频率的光窄脉冲源中,为了获得更窄的脉冲,需要增加泵浦功率;但泵浦功率的提高会使光放大器的增益趋于饱和,放大的自发辐射噪音增强,脉冲光信噪比下降.为此,提出了利用啁啾管理和光纤光参量放大相结合的脉冲压窄方案.将强度调制后的泵浦光通过相位调制引入线性负啁啾,由于经参量过程后在新的闲频光上啁啾会加倍,从而进一步增大了信号的谱宽,并通过色散补偿介质实现了光脉冲压缩.实验给出了10GHz速率下的结果,通过泵浦光的相位调制在0.5W平均泵浦光功率条件下得到了脉宽19ps的光脉冲,结果与理论分析基本吻合.

For optical short pulse with high frequency, it is needed to improve the pump power to obtain more shorter pulse; but, as increasing of the pump power, the gain of the amplifier is becoming saturated, and amplified spontaneous emission noise （ASE） is increasing, so signal to noise ratio （SNR） is decreased. A scheme of pulse compression through fiber-optical parametric amplifier and chirp management is proposed. First the pump light is phase modulated after intensity modulation to introduce linear positive chirps, after the parametric progress the frequency chirps of the idler are doubied, so its spectral width is increased, the pulse can be compressed through dispersion compensation medium. The experimental results of 10GHz operation is demonstrated, with 0.5W average pump power and phase modulated pump power, idler pulse is observed with 19ps pulse width.