To select a 400G OSFP transceiver, first match its optical type and reach to the link, then confirm connector, fiber, switch support, and host-side requirements. Common options include SR8 for short multimode-fiber links, DR4 for up to 500 m over single-mode fiber, FR4 for up to 2 km, and LR4 for up to 10 km. These reach figures describe typical standardized application limits under specified conditions; they are not guarantees for every installed link. At OPTEKCOM, we recommend checking the complete link design and target equipment before choosing a module.
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A 400G OSFP transceiver is a pluggable optical module designed for an OSFP (Octal Small Form-factor Pluggable) port and a nominal aggregate data rate of 400 Gb/s. It converts electrical signals from compatible host equipment into optical signals for transmission over fiber, and converts received optical signals back into electrical signals. The OSFP form factor describes the module interface and mechanical format, while the optical standard determines characteristics such as reach, wavelength, and fiber compatibility.
These modules are used in high-capacity data-center and networking links, including switch-to-switch and switch-to-server connections. A deployment may use one 400G link or a supported breakout configuration, depending on the module, host port, and network architecture. A breakout is not automatic: the switch platform, port configuration, and module design must all support the intended arrangement.
Choose a type according to the link medium and distance, not simply the advertised data rate. The table below summarizes commonly encountered optical options; exact specifications should be checked against the selected module’s datasheet and the applicable interface standard. Connector details can vary by product implementation, so confirm the specific part number before ordering.
| Optical type | Typical medium | Typical maximum reach | Common connection considerations |
|---|---|---|---|
| 400GBASE-SR8 | Multimode fiber, commonly OM4 | Up to 100 m on OM4 | Parallel optics; verify the module’s MPO/MTP interface and fiber polarity. |
| 400GBASE-DR4 | Single-mode fiber | Up to 500 m | Parallel optics using multiple fiber lanes; check connector and polarity requirements. |
| 400GBASE-FR4 | Single-mode fiber | Up to 2 km | Uses wavelength multiplexing over a duplex fiber connection; confirm the specified connector. |
| 400GBASE-LR4 | Single-mode fiber | Up to 10 km | Designed for longer links; confirm the exact standard, optical budget, and connector. |
SR8 is intended for short-reach links on multimode fiber, making it a possible fit for connections within a data hall when the installed cabling supports the required optical interface. Its parallel-fiber design means the link uses multiple fibers rather than a simple duplex pair. Check the fiber grade, polarity, patch-panel path, and module connector together; a connector that physically fits does not by itself establish correct lane mapping.
DR4 also uses parallel optics but operates over single-mode fiber and is commonly specified for links up to 500 m. It can suit campus-like data-center layouts where a single-mode plant is available and the link distance falls within the supported range. Confirm the fiber count and breakout or patching plan at both ends, especially when connecting to a different interface type.
FR4 and LR4 use wavelength multiplexing to carry the aggregate signal over a duplex single-mode connection. FR4 is commonly specified for up to 2 km, while LR4 is commonly specified for up to 10 km. Their simpler duplex-fiber path can be useful where parallel-fiber cabling is unavailable or undesirable, but the precise reach and optical requirements still depend on the product specification and channel conditions.
Measure the end-to-end optical path, including patch panels and intermediate connections, rather than relying only on the straight-line distance between racks or sites. Identify whether the installed plant is multimode or single-mode and, for multimode fiber, record its grade. Select a reach category that covers the actual path with appropriate engineering margin, and verify that connectors and patching components are suitable for the chosen interface.
Write down the module type, port speed, connector, and fiber requirements at each end. Links usually require compatible optical interfaces, but some designs intentionally connect different interface types through breakout assemblies or intermediate equipment. Do not assume that two modules will communicate simply because both are labeled 400G; their optical standards, lane arrangements, and configuration must align.
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Confirm that the switch or other host has an OSFP port and that the specific platform supports the intended 400G module. Check the manufacturer’s compatibility information for module coding, supported firmware or software, power and thermal limits, and host electrical interface. Also confirm whether the port needs a specific mode, such as a native 400G configuration or a supported breakout, and whether the required forward error correction (FEC) settings are available at both ends.
Review the complete bill of materials, including transceivers, fiber jumpers, trunk cables, adapters, and patch panels. For parallel optics, verify fiber polarity and lane mapping; for duplex links, verify connector type and continuity. If the installation includes splices, multiple panels, or unusually long paths, have the optical loss budget checked against the module specification rather than relying on reach alone.
Pricing for a 400G OSFP module depends on the optical type, reach, quantity, compatibility requirements, and any requested customization or testing documentation. Minimum order quantities and production or delivery lead times can vary by model and order conditions, so request current details for the exact part number rather than relying on a generic estimate. For project planning, compare the total link cost, including required fiber assemblies and any breakout components, not only the transceiver unit price.
When requesting a quotation, provide the target switch model, required optical type, link distance, fiber type, connector, quantity, and destination. If you need a nonstandard label, specific coding, or an agreed inspection process, state that requirement before order confirmation. This helps suppliers assess feasibility and clarify any schedule or validation steps in advance.
Ask the supplier to identify the exact optical standard, reach, connector, wavelength or lane arrangement, and host compatibility information for the proposed part. Request a datasheet and clarify what evidence is available for the product and what checks can be performed before shipment. For multi-vendor deployments, confirm whether the supplier can review the target equipment and discuss any compatibility limitations without making unsupported universal claims.
OPTEKCOM supplies fiber optic equipment, including optical transceivers and interconnect cables, for B2B network projects. We can help buyers compare 400G OSFP options against their stated distance, fiber plant, connector, and host requirements, then clarify product availability and order details for the selected configuration. Share your equipment list and link plan with our team to begin a practical product review.
The right 400G OSFP transceiver is the one that matches the link’s fiber, reach, connector, optical standard, and host requirements—not merely the one marked “400G.” As a starting point, consider SR8 for short multimode links, DR4 for single-mode links up to 500 m, FR4 for links up to 2 km, and LR4 for links up to 10 km, subject to each product’s specification and the installed channel. Before ordering, document both endpoints, validate the cabling path, and confirm support with the host platform.
Your next step is to prepare the switch model, port configuration, link distance, fiber type, connector, and required quantity. OPTEKCOM can use those details to discuss suitable 400G OSFP transceiver and cabling options for your deployment and provide a quotation based on the requested configuration.
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