Qeyton’s QS200 was a dense wavelength-division multiplexing (DWDM) system designed to increase capacity on metropolitan fiber networks. Launched in 1999, it targeted carriers and internet service providers that wanted to carry more traffic over existing fiber, with a reported reach of 100 km without optical amplifiers.
How Qeyton’s metro DWDM system worked
DWDM carries multiple signals on different wavelengths of light through the same fiber. By combining those wavelengths onto existing fiber, a network can add transmission capacity without laying or leasing additional fiber, provided the existing plant and equipment can support the deployment.
Qeyton positioned the QS200 for metropolitan networks, where competitive local-exchange carriers and internet service providers needed to link offices, customer sites and points of presence. The company described its client interface as protocol- and rate-independent, with support for Gigabit Ethernet, SONET and ATM/SONET networks.
Reach and power claims
At launch, Qeyton reported that the QS200 could reach 100 km without optical amplifiers. The company described amplifier-equipped future systems, with amplifiers spaced in 50 km increments, as a way to extend the network’s geography; that was a future plan, not a stated reach figure for the first-generation system.
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- "Low‑Water‑Peak Design": Fully compliant with ITU‑T G.652D and IEC 60793 specifications, this low-water-peak single‑mode bare fiber effectively suppresses OH‑ absorption loss near 1383 nm, supporting stable transmission across the full wavelength window of 1260–1625 nm.
- "It delivers ultra‑low attenuation": ≤0.34 dB/km at 1310 nm, ≤0.34 dB/km at 1383 nm, ≤0.20 dB/km at 1550 nm, and ≤0.24 dB/km at 1625 nm, ideal for long‑haul and high‑speed optical transmission systems.
- "Environmental Durability": 1% proof stress, dynamic fatigue parameter Nd ≥20, and reliable coating adhesion for stable stripping force.It withstands severe temperature cycling from ‑60°C to +85°C with additional attenuation ≤0.05 dB/km at 1550 nm, plus strong resistance to macro‑and micro‑bending loss.
- "Wide Bandwidth for WDM Systems": Optimized chromatic dispersion and polarization mode dispersion (PMD) properties support 10G, 40G, 100G, and higher‑rate transmission. Low PMD coefficient and stable dispersion characteristics make it perfect for wavelength‑division multiplexing (WDM), dense WDM (DWDM), and long‑span backbone networks.
- "Broad Application Versatility": Available in multiple length options (1km, 2km, 3km, 5km, 10km, and custom rolls) to fit engineering, construction, and maintenance demands. Widely used in telecom backbones, metro links, data center interconnections, CATV transmission, enterprise campus networks, and fiber‑to‑the‑home (FTTH) projects. Trusted for reliable, long‑term optical transmission in commercial and industrial communication systems.
Qeyton reported power consumption of 8 W per channel in 1999. The figure is the company’s claim, not an independently verified measurement in the available account.
Protection, topology and network design
The QS200 supported optical-layer protection switching in less than a millisecond, with protection assignable to individual wavelengths. That granularity allowed network operators to protect selected wavelength paths rather than treating all traffic on a fiber as one indivisible unit.
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- "Low‑Water‑Peak Design": Fully compliant with ITU‑T G.652D and IEC 60793 specifications, this low-water-peak single‑mode bare fiber effectively suppresses OH‑ absorption loss near 1383 nm, supporting stable transmission across the full wavelength window of 1260–1625 nm.
- "It delivers ultra‑low attenuation": ≤0.34 dB/km at 1310 nm, ≤0.34 dB/km at 1383 nm, ≤0.20 dB/km at 1550 nm, and ≤0.24 dB/km at 1625 nm, ideal for long‑haul and high‑speed optical transmission systems.
- "Environmental Durability": 1% proof stress, dynamic fatigue parameter Nd ≥20, and reliable coating adhesion for stable stripping force.It withstands severe temperature cycling from ‑60°C to +85°C with additional attenuation ≤0.05 dB/km at 1550 nm, plus strong resistance to macro‑and micro‑bending loss.
- "Wide Bandwidth for WDM Systems": Optimized chromatic dispersion and polarization mode dispersion (PMD) properties support 10G, 40G, 100G, and higher‑rate transmission. Low PMD coefficient and stable dispersion characteristics make it perfect for wavelength‑division multiplexing (WDM), dense WDM (DWDM), and long‑span backbone networks.
- "Broad Application Versatility": Available in multiple length options (1km, 2km, 3km, 5km, 10km, and custom rolls) to fit engineering, construction, and maintenance demands. Widely used in telecom backbones, metro links, data center interconnections, CATV transmission, enterprise campus networks, and fiber‑to‑the‑home (FTTH) projects. Trusted for reliable, long‑term optical transmission in commercial and industrial communication systems.
Qeyton said its metro nodes could be deployed in point-to-point links, protected or unprotected rings, and tree topologies. The company recommended placing optical protection at the lowest layer in new networks, alongside IP-layer redundancy for data packets. These are complementary approaches: optical protection addresses the transport path, while IP redundancy provides resilience at the packet-network layer.
QS200-SN and QS200-HN: what was different?
| Variant | Node type | Intended role |
|---|---|---|
| QS200-SN | Single-channel collector/satellite node | Aggregating traffic for collection |
| QS200-HN | Multichannel node | Interoffice ring meshes, hubs and gateway applications |
The distinction was primarily in the network role and channel configuration: the SN was described as a single-channel aggregation node, while the HN was intended for multichannel sites such as hubs and interoffice meshes.
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- "Low‑Water‑Peak Design": Fully compliant with ITU‑T G.652D and IEC 60793 specifications, this low-water-peak single‑mode bare fiber effectively suppresses OH‑ absorption loss near 1383 nm, supporting stable transmission across the full wavelength window of 1260–1625 nm.
- "It delivers ultra‑low attenuation": ≤0.34 dB/km at 1310 nm, ≤0.34 dB/km at 1383 nm, ≤0.20 dB/km at 1550 nm, and ≤0.24 dB/km at 1625 nm, ideal for long‑haul and high‑speed optical transmission systems.
- "Environmental Durability": 1% proof stress, dynamic fatigue parameter Nd ≥20, and reliable coating adhesion for stable stripping force.It withstands severe temperature cycling from ‑60°C to +85°C with additional attenuation ≤0.05 dB/km at 1550 nm, plus strong resistance to macro‑and micro‑bending loss.
- "Wide Bandwidth for WDM Systems": Optimized chromatic dispersion and polarization mode dispersion (PMD) properties support 10G, 40G, 100G, and higher‑rate transmission. Low PMD coefficient and stable dispersion characteristics make it perfect for wavelength‑division multiplexing (WDM), dense WDM (DWDM), and long‑span backbone networks.
- "Broad Application Versatility": Available in multiple length options (1km, 2km, 3km, 5km, 10km, and custom rolls) to fit engineering, construction, and maintenance demands. Widely used in telecom backbones, metro links, data center interconnections, CATV transmission, enterprise campus networks, and fiber‑to‑the‑home (FTTH) projects. Trusted for reliable, long‑term optical transmission in commercial and industrial communication systems.
How Qeyton positioned the platform
Qeyton’s stated aim was protocol neutrality, so the transport system could carry different kinds of client traffic rather than being tied to one network protocol. The company also pursued DTM-related work: it had a joint-development pact with NetInsights for DTM product development and demonstrated DTM over DWDM with Dynarc.
That positioning addressed a practical metro-network problem: growing traffic demand when building new fiber or leasing more capacity was undesirable. DWDM can raise the capacity carried on existing fiber, but it does not make every fiber plant compatible or remove the need to assess reach, topology, protection and equipment requirements.
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- Compatible10G SFP+ DWDM C25 1557.36nm 40km Optical Transceiver Optical
What happened to Qeyton Systems?
Qeyton was a Stockholm startup formed by developers from Ericsson’s transport network application lab. Cisco’s May 12, 2000 announcement said Qeyton had been founded in 1998 and that Cisco planned to acquire it for approximately $800 million in Cisco common stock. The announcement described the deal as subject to closing conditions, so it establishes the planned acquisition and integration, not by itself the date or terms of a completed transaction.
Cisco said Qeyton’s metro DWDM technology could connect carrier points of presence and customer sites in an optical ring, increasing metropolitan capacity without adding or leasing new fiber. Cisco planned to integrate the technology with its ONS 15000 optical products. The announcement also said Qeyton’s 52 Stockholm employees would continue under Cisco’s optical networking organization, subject to closing conditions.
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- "Low‑Water‑Peak Design": Fully compliant with ITU‑T G.652D and IEC 60793 specifications, this low-water-peak single‑mode bare fiber effectively suppresses OH‑ absorption loss near 1383 nm, supporting stable transmission across the full wavelength window of 1260–1625 nm.
- "It delivers ultra‑low attenuation": ≤0.34 dB/km at 1310 nm, ≤0.34 dB/km at 1383 nm, ≤0.20 dB/km at 1550 nm, and ≤0.24 dB/km at 1625 nm, ideal for long‑haul and high‑speed optical transmission systems.
- "Environmental Durability": 1% proof stress, dynamic fatigue parameter Nd ≥20, and reliable coating adhesion for stable stripping force.It withstands severe temperature cycling from ‑60°C to +85°C with additional attenuation ≤0.05 dB/km at 1550 nm, plus strong resistance to macro‑and micro‑bending loss.
- "Wide Bandwidth for WDM Systems": Optimized chromatic dispersion and polarization mode dispersion (PMD) properties support 10G, 40G, 100G, and higher‑rate transmission. Low PMD coefficient and stable dispersion characteristics make it perfect for wavelength‑division multiplexing (WDM), dense WDM (DWDM), and long‑span backbone networks.
- "Broad Application Versatility": Available in multiple length options (1km, 2km, 3km, 5km, 10km, and custom rolls) to fit engineering, construction, and maintenance demands. Widely used in telecom backbones, metro links, data center interconnections, CATV transmission, enterprise campus networks, and fiber‑to‑the‑home (FTTH) projects. Trusted for reliable, long‑term optical transmission in commercial and industrial communication systems.
What the QS200 launch means in context
The QS200 is best understood as a historical metro-transport platform, not as a current product recommendation. Its notable launch claims were 100 km reach without optical amplification, 8 W per channel, protocol-neutral client support and wavelength-level sub-millisecond protection. Those claims describe Qeyton’s first-generation system as presented at the time; they do not establish present-day availability, support, or performance against current equipment.
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