基于相位-强度调制的超短光脉冲源

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Gauss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.     

High-Quality Ultrashort Pulse Generation Utilizing a Self-Phase Modulation-Based Reshaper

An ultrashort 10-GHz pulse generation scheme was successfully demonstrated using a bulk mate- rial InGaAsP electroabsorption modulator to generate the seed pulse. A self-phase modulation-based re- shaper was used after the adiabatic soliton compression in a comb-like dispersion profiled fiber. Experi- ments and simulations confirm that the reshaper effectively removes the pulse pedestal and improves the pulse extinction ratio. As a result, the 10-GHz pulse had no pedestal, a high extinction ratio, and a pulse width of only 1.4 ps.