z-logo
open-access-imgOpen Access
Delta-sigma-modulated IFoF transmission system assisted by a correlative-level encoding technique
Author(s) -
Seunghyun Jang,
Bonghyuk Park,
Songcheol Hong,
KwangSeon Kim,
Kwang-Chun Lee
Publication year - 2018
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.029916
Subject(s) - bandwidth (computing) , encoder , delta sigma modulation , physics , quantization (signal processing) , sigma , computer science , optics , amplitude , telecommunications , electronic engineering , algorithm , engineering , quantum mechanics , operating system
A delta-sigma-modulated intermediate-frequency-over-fiber (IFoF) transmission system assisted by a correlative-level coding technique is proposed and experimentally demonstrated. Unlike conventional delta-sigma IFoF systems with multiple output levels to achieve higher signal quality or larger capacity, a correlative-level encoder is exploited as a second modulator preceded by the delta-sigma modulator. The encoder compresses the bandwidth of the delta-sigma modulated signal by creating a correlation between adjacent signal symbols. As a result, the sampling frequency of the delta-sigma modulator in the proposed system can be increased beyond the transmission bandwidth of the IFoF system, considerably improving the in-band signal quality and the transmission capacity over the conventional multi-level approach. This is because the quantization noise from the delta-sigma modulation in the proposed scheme is more aggressively pushed away from the signal bandwidth with the high sampling frequency. According to experimental results, the proposed link provides at least a 40% larger transmission capacity for similar in-band signal quality or 2.1% better average EVM performance for the same capacity than the conventional four-level pulse-amplitude-modulation delta-sigma IFoF systems.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here