AI Article Synopsis
- Weakly coupled mode-division-multiplexing (MDM) systems using intensity modulation and direct detection (IM-DD) have the potential to enhance the capacity of short-reach optical links but face challenges due to modal crosstalk and bandwidth limitations.
- The study presents a high-speed MDM IM-DD system that employs a degenerate mode diversity receiver with high-bandwidth single-mode photodetectors and low-crosstalk multiplexing/demultiplexing over a specialized few-mode fiber.
- Results demonstrate successful transmission at 112-GBaud with advanced modulation schemes, achieving over 6.4Tb/s net rate, indicating the system's viability for high-speed optical interconnections.
Article Abstract
Weakly coupled mode-division-multiplexing (MDM) systems based on intensity modulation and direct detection (IM-DD) are a good candidate for further improving the capacity of short-reach optical interconnections. However, restrained by the modal crosstalk of the transmission link and the reception of degenerate mode groups (DMGs) utilizing bandwidth-limited multimode photodetectors (PDs), high-speed MDM IM-DD has encountered a capacity bottleneck. In this Letter, we investigate a high-speed weakly coupled MDM IM-DD transmission system utilizing a degenerate mode diversity receiver scheme adopting high-bandwidth single-mode PDs over a multiple-ring-core (MRC) few-mode fiber (FMF) and a low-crosstalk mode multiplexer/demultiplexer (MUX/DMUX). An MDM IM-DD transmission with four DMGs and eight wavelengths is experimentally demonstrated with 112-GBaud four-level pulse-amplitude modulation (PAM4) and probabilistically shaped PAM8 per lane over 200-m weakly coupled MRC-FMF. To the best of our knowledge, this is the first experimental demonstration of the MDM IM-DD transmission system with up to 112-GBaud baud rate and beyond 6.4-Tb/s net rate. Meanwhile, the experimental results show that the proposed MDM IM-DD transmission link has a superior performance only adopting a low-complexity feedforward equalizer, making it a promising candidate for high-speed optical interconnections.
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| http://dx.doi.org/10.1364/OL.528473 | DOI Listing |
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