Collection: Optical Modules

Light Moves Faster Than Copper. So Should Your Data.

At the speeds modern AI clusters operate — 100G, 400G, 800G per link — copper has its limits. Distance, signal integrity, power consumption, and electromagnetic interference all become real engineering constraints the moment you're running high-speed links across a data center floor or between racks. Optical transceivers solve these problems by converting electrical signals to light, transmitting them over fiber, and converting them back — with lower latency, lower power per bit, and the ability to span distances that copper simply cannot.

But not all optical modules are created equal. Compatibility between transceiver and host platform is the critical variable that determines whether a module works reliably or causes intermittent link failures that are nearly impossible to diagnose. DVUN's optical module collection is built around verified multi-vendor compatibility — every module in our catalog is tested against the switch and NIC platforms it will be used with, so you're not discovering incompatibilities after the rack is built.

Understanding the Optical Module Landscape

• SFP+ (10GbE): The workhorse of legacy and management network connections. Still widely used for out-of-band management and lower-speed access links.
• QSFP28 (100GbE): The current standard for 100G links in AI cluster leaf switching and server NIC connections. Available in SR4, LR4, and CWDM4 variants for different reach requirements.
• QSFP-DD (200G / 400GbE): Double-density QSFP form factor for 200G and 400G links. The dominant form factor for modern AI spine switching.
• OSFP (400G / 800GbE): Octal Small Form Factor Pluggable — the emerging standard for 800G links in next-generation AI cluster fabrics.
• BiDi Modules: Bidirectional transceivers that use a single fiber strand for both transmit and receive, doubling the effective capacity of existing fiber infrastructure.
• Breakout Modules: QSFP-DD to 4x SFP28 or 8x SFP28 breakout configurations for connecting multiple lower-speed devices to a single high-speed switch port.

Reach Variants Explained

Choosing the right reach variant is as important as choosing the right speed. SR (Short Reach) modules use multimode fiber and are optimized for intra-rack and inter-rack connections up to 100m — the right choice for most AI cluster environments. LR (Long Reach) modules use single-mode fiber for connections up to 10km, suited for campus or multi-building deployments. CWDM4 and PSM4 variants offer intermediate reach options for larger data center environments. See our DAC / AOC Cables for copper-based alternatives for very short reach connections.

Compatibility & Quality Standards

• Multi-vendor compatibility verified against major switch and NIC platforms
• MSA (Multi-Source Agreement) compliant form factors
• Digital Diagnostic Monitoring (DDM/DOM) on all modules for real-time link health visibility
• Operating temperature: commercial (0–70°C) and industrial (-40–85°C) grades available
• FCC, CE, and RoHS certified
• Speeds: 10G, 25G, 40G, 100G, 200G, 400G, 800G

The Right Module for Every Link in Your Fabric

Optical modules are one of the most frequently misspecified components in AI cluster builds — and one of the easiest to get right with the right supplier. DVUN's optical module catalog covers every speed, form factor, and reach variant you need to build a complete AI cluster fabric. Request a quote for bulk module orders, or contact our team for a fiber plant compatibility review before you order.