MIMO Processing With Linear Beat Interference Cancellation for Space Division Multiplexing Self-Homodyne Coherent Transmission

Huang, Hung-Lung; Chen, Haoshuo; Huang, Yanjie; Zhang, Qianwu; Chen, Jian; Fontaine, Nicolas K.; Mazur, Mikael; Ryf, Roland; Song, Yingxiong

doi:10.1109/jlt.2022.3158689

Cited by 9 publications

(1 citation statement)

References 34 publications

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“…MIMO DSP can be employed to mitigate the XTs between channels in the links as the four mode channels are unitary. [ 39 ] However, in the alignment process, when we used the FA to detect the four modes from the arrayed edge couplers at the receiver, the small mode fields of the lensed fibers make it difficult to align all the four ports with the edge couplers, resulting in high coupling losses and large power differences between the four channels. Finally, limited by the power budget, it is hard to capture the four signals simultaneously at the receiver due to the large ILs of the chip‐to‐chip optical links and the lack of the few‐mode erbium‐doped fiber amplifier (EDFA) for signal amplification in the RCF.…”

Section: Resultsmentioning

confidence: 99%

Ultra‐High Bandwidth Density and Power Efficiency Chip‐To‐Chip Multimode Transmission through a Rectangular Core Few‐Mode Fiber

Zhang,

Li,

et al. 2023

Laser & Photonics Reviews

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Optical interconnects have emerged as promising solutions for assisting electrical interconnects in short‐reach scenarios, where high bandwidth density and energy efficiency are of particular importance. Mode‐division multiplexing (MDM), capable of enhancing the bandwidth density and energy efficiency of optical systems, has drawn tremendous interest. However, the chip‐to‐chip MDM optical interconnects are impeded by the multimode chip‐fiber interfaces, where the transverse modes on the MDM chip mismatch with the linear polarization modes in the circular core few‐mode fiber (CCF). Moreover, the high differential group delays (DGDs) of a conventional CCF make the digital signal processing (DSP) computation complex thus consuming high power. To overcome these bottlenecks, a new multimode coupling solution based on a rectangular core few‐mode fiber with ultra‐low DGDs and an integrated multimode coupler is proposed. Based on this coupling scheme, a chip‐to‐chip MDM transmission experiment is performed on the TE00, TM00, TE10, and TM10 modes, and the highest bandwidth density of 19.4 Tb s mm −1 is realized at the chip facet. The DSP power consumption is ≈6% of a conventional CCF‐based system. It is believed that this work will pave the way for ultra‐compact, high density, low cost, and low computation‐complexity optical interconnects, such as data centers, cloud computing, and telecommunications.

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Section: Resultsmentioning

confidence: 99%