Dual-polarization direct-detection for data-center optical communications

Christopher R. Doerr

doi:10.1117/12.2653256

15 March 2023 Dual-polarization direct-detection for data-center optical communications

Christopher R. Doerr

Proceedings Volume 12429, Next-Generation Optical Communication: Components, Sub-Systems, and Systems XII; 1242918 (2023) https://doi.org/10.1117/12.2653256
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Currently, most optical communication links shorter than ∼40 km employ intensity-modulation direct-detection (IMDD), and most longer links employ coherent. Demand for reduction in cost-per-transmitted-bit is relentlessly continuing, forcing IMDD and coherent to higher and higher rates. Coherent has better impairment equalization capability, better sensitivity, and a larger number of bits per transmitted symbol, ideal characteristics for next-generation links. However, coherent requires more complex lasers, more signal processing, more power consumption, and gear-boxing. IMDD, on the other hand, can be directly driven from electrical I/O and from electro-absorption-modulated lasers, making it significantly lower cost and power. We present taking one of the features of coherent, the use of dual polarization, and applying it in a blind way to IMDD. This allows a true and near-term way to continue on the cost-per-transmitted bit reduction path for optical data-center links.

Conference Presentation

Citation Download Citation

Christopher R. Doerr "Dual-polarization direct-detection for data-center optical communications", Proc. SPIE 12429, Next-Generation Optical Communication: Components, Sub-Systems, and Systems XII, 1242918 (15 March 2023); https://doi.org/10.1117/12.2653256

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