title: Estimation and compensation of sample frequency offset in coherent optical OFDM systems.
abstract: 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.
authors: School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan, China. xwyi@uestc.edu.cn
authors: Xingwen
authors: X
authors: Yi
authors: Kun
authors: K
authors: Qiu
mesh_terms: D016477:Artifacts; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005246:Feedback; D055096:Optical Devices; D018401:Sample Size; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*