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Elenion Technologies

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Elenion Technologies is a New York-based silicon photonics technology company whose coherent optical subassembly (COSA) technology now sits inside Nokia's optical networking portfolio.

Last updated September 28, 2026

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Overview

Elenion Technologies is a photonics technology company based in New York, United States, focused on silicon photonics for high-speed optical communications. It is best known for developing coherent optical subassemblies (COSAs) — compact optical front-end modules that convert electrical signals from a coherent digital signal processor (DSP) into modulated optical signals for transmission, and convert incoming light back into electrical signals for the DSP to decode. These components are central building blocks of coherent transceivers used in fiber-optic transport networks. Elenion's technology became part of Nokia's optical networking business, where silicon-photonics-based coherent optical subassemblies are marketed as a component family alongside TROSAs, coherent DSPs and coherent pluggable modules. Nokia describes COSAs as coherent optical front ends powered by silicon photonic integrated circuits, used across optical transport, data center interconnect and coherent routing applications. As a Nokia entity, Elenion operates within a global connectivity infrastructure group that serves telecommunications providers, mission-critical enterprises, AI and cloud providers, and technology licensees in more than 150 countries. Nokia positions its optical portfolio around coherent transport, open optical networking and quantum-safe optical transport, with silicon photonics as a key enabling technology. The brand's commercial identity is therefore that of a specialized photonics technology supplier that has been absorbed into a larger optical networking vendor: its name persists as a technology and component brand within Nokia's optical networks organization rather than as an independent, separately listed company.

History

Elenion Technologies is a photonics technology company based in New York, United States. It built its business around silicon photonics — the integration of optical functions onto silicon chips — applied to coherent optical communications, where data is encoded onto the phase and amplitude of light rather than simply switched on and off. The company's signature technology is the coherent optical subassembly, or COSA. A COSA is a compact optical front end that enables a coherent transceiver to transmit and receive high-speed data over fiber networks. In the transmit direction it converts electrical signals from a coherent digital signal processor (DSP) into modulated optical signals, typically using an external laser; in the receive direction it translates incoming light into electrical signals for the DSP to decode. COSAs are therefore critical components in coherent pluggable modules and embedded optical engines. Elenion's silicon photonics capabilities were brought into Nokia, the Finnish-headquartered global connectivity infrastructure company, and its technology now appears in Nokia's optical networks component portfolio. Nokia markets coherent optical subassemblies as coherent optical front ends powered by silicon photonic integrated circuits, listed alongside TROSAs, coherent DSPs and coherent pluggable modules such as the ICE-X and PSE families. Nokia's optical business serves telecommunications providers, mission-critical enterprises, AI and cloud providers, and technology licensees, and its optical portfolio spans coherent routing, data center interconnect, open optical networking and quantum-safe optical transport. Within Nokia, the Elenion-derived silicon photonics work supports the broader strategic direction of the group, which describes itself as a global leader in connectivity infrastructure enabling the AI supercycle, with more than 160 years in business, customers in over 150 countries, and substantial cumulative investment in advancing connectivity. Nokia's stated history includes the creation of photonic integrated circuits in 2009, a technology area directly relevant to the silicon photonics components associated with Elenion. Because Elenion operates as part of Nokia rather than as an independent listed company, its public brand presence is primarily technical and component-oriented: it is referenced as a photonics technology company based in New York and as the source of coherent optical subassembly technology used in Nokia's optical networking products.

  • Elenion Technologies is described as a photonics technology company based in New York.

    [5]
  • Elenion's coherent optical subassembly (COSA) technology appears in Nokia's optical networks component portfolio.

    [1]
  • Nokia lists coherent optical subassemblies among its optical components, alongside TROSAs and coherent DSPs.

    [1]

Products and positioning

Specialist silicon photonics and coherent optical component technology, now integrated into Nokia's optical networks portfolio as a component-level offering.

  • Coherent Optical Subassembly (COSA)

    A compact optical front end that enables a coherent transceiver to transmit and receive high-speed data over fiber networks, converting electrical signals from a coherent DSP into modulated optical signals and incoming light back into electrical signals.

  • Silicon photonic integrated circuits

    Silicon photonics technology powering coherent optical front ends in Nokia's optical component portfolio.

Recent events

  • Reported

    Nokia completes acquisition of Elenion Technologies[6]

    Nokia announced that it had successfully completed its acquisition of Elenion Technologies, a U.S.-based silicon photonics technology company.

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