Abstract

There is a growing interest in applying carrierless amplitude-phase (CAP) modulation in intensity modulated optical links. CAP as a multilevel modulation scheme can reach high spectral efficiency and be generated at low cost. An interesting feature of CAP is that its signal basis can be extended to three or more dimensions (D). This paper aims to complete the knowledge on 3-D CAP. Discussed are design of transceiver filters, spectral efficiency, and digital equalization in 3-D. Several problems accompanying 3-D CAP transmission are identified. The most significant are the peak to average power ratio, which is higher than in one or two dimensions and noise correlation at the output of a 3-D equalizer. It is found that the latter problem severely degrades bit error rates achieved but can be efficiently mitigated using noise whitening equalization. Finally, 1-D, 2-D, and 3-D CAP are compared experimentally in a step-index polymer optical fiber link.

© 2014 IEEE

Novel design of N-dimensional CAP filters for 10  Gb/s CAP-PON system

Jiale He, Lu Shi, Lei Deng, Mengfan Cheng, Ming Tang, Songnian Fu, Minming Zhang, Perry Ping Shum, and Deming Liu
Opt. Lett. 40(10) 2409-2412 (2015)

Experimental demonstration of a 10  Gb/s non-orthogonal multi-dimensional CAP-PON system based on the ISI and CCI cancellation algorithm

Lu Shi, Di Li, Jiale He, Lei Deng, Mengfan Cheng, Ming Tang, Songnian Fu, Minming Zhang, Perry Ping Shum, and Deming Liu
Opt. Lett. 41(17) 3988-3991 (2016)

Real-time investigation of CAP transceivers with hybrid digital equalization for visible light communication

Yanfeng Mao, Xianqing Jin, Weidong Pan, Weijie Liu, Meiyu Jin, Chen Gong, and Zhengyuan Xu
Opt. Express 27(7) 9382-9393 (2019)

Improving the spectral efficiency of visible light communications by a super-Nyquist multi-band CAP modulation

Zhongxing Tian, Yi Cai, Lin Sun, Hansheng Xu, Chaoran Xiong, Mingyi Gao, Chenxu Jiang, Xiaobin Dong, Bin Xia, Gordon Ning Liu, and Gangxiang Shen
Opt. Lett. 47(23) 6069-6072 (2022)

Comparison of 100G PAM-8, CAP-64 and DFT-S OFDM with a bandwidth-limited direct-detection receiver

Jianyang Shi, Junwen Zhang, Nan Chi, and Jianjun Yu
Opt. Express 25(26) 32254-32262 (2017)