Achievable Rates for Short-Reach Fiber-Optic Channels with Direct Detection
Abstract
Spectrally efficient communication is studied for short-reach fiber-optic links with chromatic dispersion (CD) and receivers that employ direction-detection and oversampling. Achievable rates and symbol error probabilities are computed by using auxiliary channels that account for memory in the sampled symbol strings. Real-alphabet bipolar and complex-alphabet symmetric modulations are shown to achieve significant energy gains over classic intensity modulation. Moreover, frequency-domain raised-cosine (FD-RC) pulses outperform time-domain RC (TD-RC) pulses in terms of spectral efficiency for two scenarios. First, if one shares the spectrum with other users then inter-channel interference significantly reduces the TD-RC rates. Second, if there is a transmit filter to avoid interference then the detection complexity of FD-RC and TD-RC pulses is similar but FD-RC achieves higher rates.
Keywords
Cite
@article{arxiv.2111.07865,
title = {Achievable Rates for Short-Reach Fiber-Optic Channels with Direct Detection},
author = {Daniel Plabst and Tobias Prinz and Thomas Wiegart and Talha Rahman and Nebojša Stojanović and Stefano Calabrò and Norbert Hanik and Gerhard Kramer},
journal= {arXiv preprint arXiv:2111.07865},
year = {2022}
}
Comments
Submitted to J. Lightw. Technol. on November 15, 2021; revised January 7, 2022; accepted January 22, 2022