Abstract

With the increasing demand of bandwidth, a higher capacity communication system is required for short-reach optical link. Intensity modulation/direct detection (IM-DD) is considered as a reasonable method, due to its low cost and power consumption. In the aspect of digital signal processing (DSP), discrete Fourier transform-spread (DFT-s) precoding can be used to reduce peak to average power ratio (PAPR) and average the noise among the subcarriers. In addition, probabilistic shaping (PS) turns out to further increase the system capacity. We experimentally demonstrated a 200 Gbit/s single λ dual band DMT transmission with a spectrum efficiency (SE) of 6.29 bit/s/Hz. The achievable information rate (AIR) of the proposed dual band signal increases about 30 Gbit/s compared with that of single band signal. Moreover, single-sideband (SSB) signal and signal with guard band are implemented to mitigate the frequency selective fading of optical fiber chromatic dispersion (CD). The performance of these two methods are quite closed for short reach transmission. Considering the signal-signal beat interference (SSBI) introduced by the SSB signal, an extra Volterra filter is applied in DSP. Besides, an extra optical filter is required to generate the SSB signal.

Performance enhanced DDO-OFDM system with adaptively partitioned precoding and single sideband modulation

Xi Chen, Zhenhua Feng, Ming Tang, Songnian Fu, and Deming Liu
Opt. Express 25(19) 23093-23108 (2017)

2048 QAM (66 Gbit/s) single-carrier coherent optical transmission over 150 km with a potential SE of 15.3 bit/s/Hz

Shohei Beppu, Keisuke Kasai, Masato Yoshida, and Masataka Nakazawa
Opt. Express 23(4) 4960-4969 (2015)

Squeezing out the last few bits from band-limited channels with entropy loading

Di Che and William Shieh
Opt. Express 27(7) 9321-9329 (2019)

Comparison of null-subcarriers reservation and adaptive notch filter for narrowband interference cancellation in intra-data center interconnect with DMT signal transmission

Dongdong Zou, Yongchao Chen, Zibin Li, Fan Li, Li Ding, Yidan Sun, Jianping Li, Qi Sui, Xingwen Yi, and Zhaohui Li
Opt. Express 27(4) 5696-5702 (2019)

Nonlinearity-aware 200  Gbit/s DMT transmission for C-band short-reach optical interconnects with a single packaged electro-absorption modulated laser

Lu Zhang, Xuezhi Hong, Xiaodan Pang, Oskars Ozolins, Aleksejs Udalcovs, Richard Schatz, Changjian Guo, Junwei Zhang, Fredrik Nordwall, Klaus M. Engenhardt, Urban Westergren, Sergei Popov, Gunnar Jacobsen, Shilin Xiao, Weisheng Hu, and Jiajia Chen
Opt. Lett. 43(2) 182-185 (2018)