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.

arXiv commentSubmitted to J. Lightw. Technol. on November 15, 2021; revised January 7, 2022; accepted January 22, 2022

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• End-to-end Deep Learning of Optical Fiber Communications
• Compressive Phase Retrieval via Generalized Approximate Message Passing
• Information capacity of direct detection optical transmission systems
• Wiener Filter for Short-Reach Fiber-Optic Links
• Direct Detection Under Tukey Signalling
• On the Capacity of Waveform Channels Under Square-Law Detection of Time-Limited Signals

Cited by in corpus (2)

• Information Rates for Channels with Fading, Side Information and Adaptive Codewords
• Practical Considerations in Direct Detection Under Tukey Signalling