Achievable Rates for Short-Reach Fiber-Optic Channels with Direct Detection

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 sampl...

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Bibliographic Details
Published in:arXiv.org 2022-03
Main Authors: Plabst, Daniel, Prinz, Tobias, Wiegart, Thomas, Rahman, Talha, Stojanović, Nebojša, Calabrò, Stefano, Hanik, Norbert, Kramer, Gerhard
Format: Article
Language:English
Subjects:
Channels
Complexity
Fiber optics
Interference
Oversampling
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2111.07865