Ultra-Broadband Surface-Normal Coherent Optical Receiver with Nanometallic Polarizers

Soma, Go; Yanwachirakul, Warakorn; Miyazaki, Toshiki; Kato, Eisaku; Onodera, Bunta; Tanomura, Ryota; Fukui, Taichiro; Ishimura, Shota; Sugiyama, Masakazu; Nakano, Yoshiaki; Tanemura, Takuo

doi:10.1021/acsphotonics.2c00759

Cited by 11 publications

(1 citation statement)

References 39 publications

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“…The EVM was less than 3% for all spatial/polarization channels from 1530 to 1570 nm. While the speed was limited by the InGaAs camera in this work, use of high-speed PD arrays [39], [40], [41] can easily achieve >100 Gb/s bandwidth per single spatial/polarization channel, enabling >Tb/s total data rate for four-core DP coherent signals. Our designed MS can simply replace microoptic lenses used in conventional receivers and can be inserted between an MCF and a PD array separated by less than 1 cm.…”

Section: Discussionmentioning

confidence: 99%

Scalable Multi-Core Dual-Polarization Coherent Receiver Using a Metasurface Optical Hybrid

Komatsu,

Soma,

Ishimura

et al. 2024

J. Lightwave Technol.

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The space-division multiplexed (SDM) coherent transmission using a multi-core fiber (MCF) is a promising technology for further increasing the capacity of optical communications and interconnects. For broader application of SDM systems, dual-polarization (DP) coherent receivers that can be directly coupled to MCFs without bulky fan-in/fan-out (FIFO) devices and polarization beam splitters (PBSs) are desirable. Unlike intensity-modulation direct-detection (IMDD) receivers, however, scaling a DP coherent receiver to multiple spatial channels in a compact form factor is not straightforward. Here, we propose and demonstrate a compact and scalable surface-normal multi-core DP coherent receiver using an ultrathin dielectric metasurface (MS). The MS is composed of silicon nanoposts on quartz, which are judiciously designed to function as the DP optical hybrids and focusing lenses for all spatial channels. Using the fabricated device, simultaneous homodyne detection of DP 64-ary quadrature-amplitude-modulation signals from a four-core fiber is demonstrated with an error vector magnitude of less than 3% for all spatial/polarization channels from 1530 to 1570 nm. The demonstrated receiver can be assembled into a compact module to enable low-cost SDM coherent receivers without bulky PBS and FIFO devices.

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Section: Discussionmentioning

confidence: 99%

Scalable Multi-Core Dual-Polarization Coherent Receiver Using a Metasurface Optical Hybrid

Komatsu,

Soma,

Ishimura

et al. 2024

J. Lightwave Technol.

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Broadband polarizer using single-layer grating with ultra-high extinction ratio

et al. 2023

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Polarizers are an essential optical element for tailoring the polarization state of electromagnetic waves in a wide range of optical devices. Such polarizers, which exhibit a wide operating bandwidth and high performance, are attracting increasing attention, due to their extensive prospects for use in applications ranging from polarization imaging, to optical communications and detection, among others. However, achieving both broadband performance and ultra-high extinction ratio (ER), and that simultaneously, is still challenging in the design of effective polarizers. To tackle that demand, in this work, an Au-on-silica grating structure has been proposed as the basis of the design of a miniaturized high-efficiency polarizer that practically can cover the entire visible and near-infrared spectral ranges. The single-layer polarizer thus designed can show an ER of 60 dB in this spectral domain, and it has been shown that the geometrical parameters selected have a significant effect on the performance characteristics of the polarizer. Furthermore, an ER of ∼150 dB could be achieved merely by regulating the thickness of the grating to achieve the optimum performance. By integrating the high-performance polarizer proposed in this work with an optical fiber “meta-tip,” a refractive polarizer with a value of the ER of >45 dB, and that over the entire spectral domain considered, has been demonstrated. Such an approach offers an alternative route to achieving a broadband, powerful, and flexible processing polarizer design.

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