Bandpass sampling based digital coherent receiver with free-running local oscillator laser for phase-modulated radio-over-fiber links.
Bandpass sampling based digital coherent receiver with free-running local oscillator laser for phase-modulated radio-over-fiber links.
复制标题
DOI：
10.1364/oe.22.027007
复制
发表时间：
2014-11
期刊：
影响因子：
3.8
通讯作者：
Minghua Cao;Jianqiang Li;Yitang Dai;Feifei Yin;Kun Xu
中科院分区：
文献类型：
--
作者：
Minghua Cao;Jianqiang Li;Yitang Dai;Feifei Yin;Kun Xu
提出了一种基于带通采样的数字相干接收机，用于相位调制的光纤无线通信系统中的相干检测。该方案在RoF系统中引入带通采样技术，克服了传统数字相干接收机的高采样率要求和前端硬件依赖性。特别地，通过考虑自激光学本振器引起的频率偏移，定义了带通采样率的选择规则。分析评估和模拟用于确定ADC位分辨率和激光线宽公差方面的最终性能。此后，在2.4GHz的RF载波频率的40Mbps QPSK调制的数据信号的实验表明，在建议的50.6公里的无线电光纤链路采用带通采样。
A bandpass sampling based digital coherent receiver is presented for phase modulated radio-over-fiber links with coherent detection. In the scheme, the bandpass sampling technique is introduced in RoF systems to overcome the high sampling rate requirement and front-end hardware dependency of conventional digtal coherent receivers. In particular, the selection rule of bandpass sampling rate was defined by taking into account the frequency offset induced by free-running optical local oscillator. Analytical assessment and simulations are used to determine the ultimate performance in terms of tolerances to ADC bit resolution and laser linewidth. Thereafter, a 40Mbps QPSK modulated data signal at 2.4GHz RF carrier frequency is experimentally demonstrated over the proposed 50.6-km radio-over-fiber link employing bandpass sampling.