Estimation and compensation of sample frequency offset in coherent optical OFDM systems.
Estimation and compensation of sample frequency offset in coherent optical OFDM systems.
复制标题
DOI：
10.1364/oe.19.013503
复制
发表时间：
2011-07
期刊：
影响因子：
3.8
通讯作者：
X. Yi;K. Qiu
中科院分区：
文献类型：
--
作者：
X. Yi;K. Qiu
相干光OFDM系统在发射机处采用DAC，在接收机处采用ADC。此类系统中DAC和ADC的采样频率需要同步，尤其是在高速传输的情况下。本文提出了一种信道模型，包括采样频率偏移的影响，它增加了一个额外的相移成比例的子载波索引。讨论了采样频偏的监测和补偿方法，并进行了实验验证。期望通过将监视结果反馈到接收器振荡器来实现同步。
Coherent optical OFDM systems employ DAC at the transmitters and ADC at the receivers. The sample frequencies of DAC and ADC in such systems need to be synchronized, especially in the context of high-speed transmissions. This paper presents a channel model including the effect of the sample frequency offset, which adds an additional phase shift proportional to the subcarrier index. The sample frequency offset monitoring and the compensation method are discussed and verified in experiment. It is expected that the synchronization can be achieved by feeding the monitoring result back to the receiver oscillator.