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为了获得低成本的高重复频率超短光脉冲源,满足高速光时分复用(OTDM)的需求,该文使用商用的铌酸锂调制器对连续光进行相位-强度调制,利用色散补偿光纤(DCF)和梳状色散光纤链(CDPF)对产生的光脉冲分别进行啁啾补偿、非线性压缩。压缩后的光脉冲注入高非线性光纤(HNLF),利用HNLF的自相位调制效应(SPM)展开脉冲光谱,滤波后消除光脉冲的基座实现脉冲整形。光带通滤波器(OBPF)的带宽为5 nm时,获得了脉宽为1.2 ps的光脉冲;OBPF的带宽为3 nm时,获得了无基座且接近Fourier变换极限的G auss光脉冲,其脉宽为1.8 ps。结果表明,滤波器带宽对光脉冲的脉宽及质量有着重要影响。
In order to meet the demand of high speed optical time division multiplexing (OTDM) in order to obtain a low cost, high repetition rate ultrashort optical pulse source, the phase-intensity modulation of continuous light with a commercial lithium niobate modulator is used. The dispersion compensation fiber DCF) and comb-shaped dispersion optical fiber chain (CDPF) are respectively chirped compensated and nonlinearly compressed. The compressed light pulse is injected into a highly nonlinear fiber (HNLF), the pulse spectrum is developed by using the self-phase modulation effect (SPM) of the HNLF, and the base of the light pulse after filtering is filtered to achieve pulse shaping. When the bandwidth of OBPF is 5 nm, the pulse with pulse width of 1.2 ps is obtained. When the bandwidth of OBPF is 3 nm, the G auss pulse with no base near the Fourier transform limit is obtained. Its pulse width is 1.8 ps. The results show that the filter bandwidth has an important influence on the pulse width and quality of the light pulse.