Open AccessHigh-fidelity angle-modulated analog optical link
Author(s) -
Di Che,
Yanqin Feng,
William Shieh
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.016320
Subject(s) - optical link , pulse amplitude modulation , analog transmission , bandwidth (computing) , computer science , optics , modulation (music) , amplitude modulation , quadrature amplitude modulation , electronic engineering , optical modulation amplitude , link adaptation , intensity modulation , analog signal , phase modulation , frequency modulation , telecommunications , physics , channel (broadcasting) , optical amplifier , bit error rate , optical fiber , laser , engineering , acoustics , phase noise , fading , pulse (music) , detector , transmission (telecommunications)
There has long existed a debate over whether analog or digital optical link is more suitable for wireless convergence applications. Digital link achieves the highest fidelity, with the sacrifice of huge bandwidth due to the high resolution of digitization, and large power consumption due to the exhaustive digital data recovery. Analog link avoids these drawbacks, but it inevitably suffers from the SNR degradation. In this paper, we propose the angle modulation for analog optical link, which successfully breaks the SNR ceiling of amplitude modulation, and achieves ultrahigh link fidelity. Using the digital link (CPRI) equivalent bandwidth, angle modulation exhibits around 30-dB SNR advantage over the conventional amplitude modulation. Combined with its high tolerance on link nonlinearity, angle modulation has great potential in the future SNR-hungry analog optical applications.