Abstract

For the digital subcarriermultiplexing (DSM) transmission, it is compulsory to realize the frequency offset estimation (FOE) and compensation (FOC) before the subcarrier de-multiplexing and the chromatic dispersion (CD) compensation (CDC). Here, we demonstrate a blind FOE method for the spectral-efficient DSM signals with a sharper root raised cosine (RRC) spectral shaping, with the capabilities of the transparent modulation format operation, a wide FOE range, and a high FOE accuracy. By reusing the spectral information for the CDC, the proposed FOE method is hardware efficient. Moreover, the proposed FOE method is numerically identified robust to transmission impairments, including the amplified spontaneous emission (ASE) noise, the optical filtering effect, and the accumulated CD, with an estimation error of less than 35 MHz under a FFT size of 2048. The correct function of the proposed FOE method is finally experimentally verified for 25 Gbaud 16QAM DSM signals under scenarios of both back-to-back (B2B) and standard single-mode fiber (SSMF) transmissions.

Hardware-efficient blind frequency offset estimation for digital subcarrier multiplexing signals

Meng Xiang, Hong Lv, Songnian Fu, Jianpin Li, Ou Xu, Di Peng, Zhensen Gao, Yuncai Wang, and Yuwen Qin
Opt. Express 29(13) 19879-19890 (2021)

Blind frequency offset estimation using the optimal decision threshold-assisted QPSK-partition method for probabilistically shaped MQAM systems

Xue Tang, Hengying Xu, Chenglin Bai, Yaxuan Fan, Yining Zhang, Lishan Yang, Lingguo Cao, Weibin Sun, and Nan Cui
Opt. Express 30(20) 37175-37192 (2022)

Frequency offset estimation for nonlinear frequency division multiplexing with continuous spectrum modulation

Yonghua He, Jianping Li, Jianqing He, Yuwen Qin, Xinkuo Yu, Ning Lin, Gai Zhou, Meng Xiang, and Songnian Fu
Opt. Express 31(20) 32887-32899 (2023)

Digital pilot aided carrier frequency offset estimation for coherent optical transmission systems

Donghe Zhao, Lixia Xi, Xianfeng Tang, Wenbo Zhang, Yaojun Qiao, and Xiaoguang Zhang
Opt. Express 23(19) 24822-24832 (2015)

Blind frequency offset estimation method based on a minimum phase correction error for a full spectrum modulated NFDM system

Jianqing He, Jianping Li, Yuwen Qin, Xinkuo Yu, Tao Huang, Gai Zhou, and Songnian Fu
Opt. Lett. 49(9) 2313-2316 (2024)