Lessengers develops and produces optical transceiver modules, including 100G, 800G, and 1.6T products for AI, hyperscale, and data-center networks.
Lessengers is a 2017-founded optical component company built on Direct Optical Wiring, a polymer-based air-cladded waveguide that couples active devices to fibre without lenses, active alignment or an air gap. Its shipped and announced products are VCSEL-based multimode: 200G SR4, 400G SR4 and SR8, 800G 2xSR4 and SR8 including partially retimed variants with an integrated DSP on the transmit side, a 1.6T OSFP 2xSR4 announced 2025-03-31, plus active optical cables and a 200G optical engine. The founder previously led optical device R&D teams at Samsung Electro-Mechanics and LG Innotek and holds a PhD from POSTECH. On 2026-03-17 it expanded an existing partnership with POET Technologies to jointly develop a 1.6T 2xDR4 module combining POET optical engines with DOW, with samples targeted for the second quarter of 2026. An independent optical-components analyst note published 2026-07-28 assesses that Lessengers will need a large manufacturing partner to scale transceivers and that its likelier route is licensing DOW to a major manufacturer.
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Lessengers develops and produces optical transceiver modules, including 100G, 800G, and 1.6T products for AI, hyperscale, and data-center networks. Lessengers is a 2017-founded optical component company built on Direct Optical Wiring, a polymer-based air-cladded waveguide that couples active devices to fibre without lenses, active alignment or an air gap. Its shipped and announced products are VCSEL-based multimode: 200G SR4, 400G SR4 and SR8, 800G 2xSR4 and SR8 including partially retimed variants with an integrated DSP on the transmit side,
Lessengers is on the AI Core watchlist list of Frontier Tech Intelligence with a score of 47 out of 100, below the Top 100.
Lessengers is based in Pohang, North Gyeongsang, South Korea.
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