W-band RoF transmission based on optical multi-carrier generation by cascading one directly-modulated DFB laser and one phase modulator
W-band RoF transmission based on optical multi-carrier generation by cascading one directly-modulated DFB laser and one phase modulator
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DOI：
10.1016/j.optcom.2015.01.059
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发表时间：
2015-06
影响因子：
2.4
通讯作者：
Xinying Li;Jianjun Yu
中科院分区：
文献类型：
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作者：
Xinying Li;Jianjun Yu
实验证明，采用基于直接调制分布反馈激光器（DML）和相位调制器（PM）级联的光多载波源，从产生的光子载波中选择任意一对间隔100 GHz的子载波，可以利用远程外差技术产生100 GHz毫米波频率，从而在W波段的光纤无线电（RoF）系统上实现3.125-Gb/s开关键控（OOK）信号传输。经过20 km的大有效面积光纤（LEAF）传输和2 m的无线传输后，当两个间隔为100 GHz的选定子载波在远程外差之前同时调制时，可以获得1×10− 9的误码率（BER）。在BER为1×10− 9时，2 m无线传输会导致1.5 dB的功率损失，而20 km LEAF传输几乎不会导致功率损失。然而，由于不同的路径长度和DML的相当宽的线宽，在相同的RoF传输后的3.125-Gb/s的OOK信号不能被恢复时，两个选定的子载波被分成两个不同的光路，只有其中一个被调制之前远程外差。
We experimentally demonstrate that, adopting an optical multi-carrier source based on cascaded directly-modulated distributed-feedback laser (DML) and phase modulator (PM), any pair of subcarriers spaced by 100 GHz selected from the generated optical subcarriers can be used to generate 100-GHz millimeter-wave (mm-wave) frequency based on remote heterodyning technique, and thus realize 3.125-Gb/s on-off-keying (OOK) signal transmission over a radio-over-fiber (RoF) system at W-band. After 20-km large-effective-area fiber (LEAF) transmission and 2-m wireless delivery, the bit-error ratio (BER) of 1×10−9can be attained when the two selected subcarriers spaced by 100 GHz are simultaneously modulated before remote heterodyning. 1.5-dB power penalty at the BER of 1×10−9is caused by 2-m wireless delivery while almost no penalty is caused by 20-km LEAF transmission. However, because of different path lengths and the quite wide linewidth of the DML, the 3.125-Gb/s OOK signal after the same RoF transmission cannot be recovered when the two selected subcarriers are separated into two different optical paths and only one of them is modulated before remote heterodyning.