Scaffardi Mirco, Pinna Sergio, Lazzeri Emma, Bogoni Antonella
Opt Lett. 2014 Apr 1;39(7):1733-6. doi: 10.1364/OL.39.001733.
We propose and demonstrate a technique for the generation of an optical comb with tunable line spacing in a periodically poled lithium niobate (PPLN) waveguide. The technique is implemented with four input continuous waves (CWs), which generate a 19-line comb tuned to the spacing of 25 and 20 GHz. We show that each additional CW switched on out of the quasi phase-matching band at the PPLN waveguide input generates the growth of six new lines. The performance of the comb is tested modulating the lines with a 40 Gb/s differential quadrature phase shift keying data, demonstrating error-free operation. Nonuniform spacing of the input seed CWs improves the efficiency of the line generation process.
我们提出并演示了一种在周期性极化铌酸锂（PPLN）波导中产生具有可调谐线间距的光学频率梳的技术。该技术通过四个输入连续波（CW）实现，可产生调谐到25 GHz和20 GHz间距的19线频率梳。我们表明，在PPLN波导输入端的准相位匹配带之外开启的每个额外连续波会产生六条新谱线的增长。通过用40 Gb/s差分正交相移键控数据调制谱线来测试频率梳的性能，证明了无误码操作。输入种子连续波的非均匀间距提高了谱线产生过程的效率。
