Products / 25G SFP28 Transceivers
25G SFP28 Optical Transceiver Supplier
NodeOptic is a factory-direct 25G SFP28 transceiver supplier and manufacturer covering SR, LR, ER, BiDi, CWDM/DWDM optics and SFP28 DAC/AOC cables. Our 25G modules are widely used in ToR-to-server and GPU node links, leaf-spine fabrics, mobile backhaul, 5G fronthaul, and AI backhaul deployments. Every module is 100% lab-tested before shipment and backed by a 5-year warranty.
- ✓ Full portfolio of 25G SFP28 optics: SR, LR, ER, BiDi, CWDM and DWDM for any distance and fiber type
- ✓ SFP28 DAC and AOC options optimized for top-of-rack server and GPU connectivity
- ✓ Compatible with Cisco, Mellanox/NVIDIA, Juniper, Arista, HPE, and other major platforms
- ✓ Low-power, high-density design suited for modern data centers and AI/ML clusters
Product Range
25G SFP28 Product Range
25G SFP28 modules operate at 25/28 Gbps per channel and conform to IEEE 802.3by/cc and SFF-8402, supporting Ethernet, Fibre Channel, and CPRI applications. Compared to 10G, 25G delivers three times the bandwidth per port at a lower cost per bit, making it the dominant choice for ToR-to-server links, AI backhaul, and next-generation access layers. As a 25G SFP28 module manufacturer, NodeOptic covers the full range of fiber optic variants plus DAC and AOC for every deployment scenario.
25G SFP28 SR
850 nm on OM3/OM4 MMF with reach up to 70–100 m depending on fiber grade. The standard choice for in-rack and cross-rack ToR-to-server links, short leaf-spine hops, and GPU node connectivity in AI clusters where latency and port density are priorities.
25G SFP28 LR / ER
1310 nm SMF with reach up to 10 km (LR) or 40 km (ER). Used for longer leaf-spine links, inter-building aggregation, metro access, and mobile backhaul where single-mode fiber is already deployed and higher optical budgets are needed.
25G SFP28 BiDi
Single-fiber bidirectional modules using paired Tx/Rx wavelengths (typically 1270/1330 nm) to carry 25G full-duplex over one strand of SMF. Ideal for fiber-constrained data center inter-row or access deployments where halving fiber consumption matters.
25G CWDM / DWDM SFP28
Wavelength-specific modules for WDM backhaul, 5G mobile fronthaul/midhaul, and data center cross-site interconnect. CWDM channels suit regional ISP and enterprise rings; DWDM channels provide high-density long-haul capacity for carrier networks.
DAC & AOC
25G SFP28 DAC & AOC for Top-of-Rack Links
In modern data centers, ToR switch-to-server and GPU node connections are often covered with SFP28 DAC or AOC cables rather than optical transceivers. These passive and active cable assemblies eliminate the separate transceiver cost, reduce power consumption per port, and typically offer sub-nanosecond latency suitable for RDMA and AI training workloads. NodeOptic supplies a full range of 25G SFP28 DAC and AOC assemblies coded for major switch and NIC vendors.
SFP28 DAC Cables
25G SFP28 DAC cables are fully passive copper assemblies available in 1 m, 2 m, 3 m, 5 m, and 7 m lengths, making them the lowest-cost, lowest-latency option for same-rack server-to-switch connections. With no optical components, they require no power for signal conversion and are ideal for high-density ToR deployments in AI clusters and standard compute racks. A 25G SFP28 DAC cable is the preferred choice when the switch and server sit within the same cabinet.
SFP28 AOC Cables
25G SFP28 AOC cables use integrated optical transceivers at each end of a lightweight fiber assembly, covering distances from 3 m up to 30 m for inter-rack and cross-row connections. They are significantly lighter and more flexible than copper DAC cables, making them easier to route in high-density cable management environments. SFP28 AOC is the best solution for ToR server connections that span multiple racks or cabinets where copper would be impractical.
Quick Comparison
| Type | Distance | Best For |
|---|---|---|
| SFP28 DAC | 1–7 m | Same rack, lowest cost & latency |
| SFP28 AOC | 3–30 m | Cross-rack, lightweight routing |
| SFP28 SR | up to 100 m | MMF, rack rows, TOR-server |
| SFP28 LR | up to 10 km | SMF, inter-building, metro |
Applications
25G Applications in Modern Networks
25G SFP28 has become the standard access speed across data center, AI, and 5G infrastructure. As a 25G SFP28 supplier for ISPs and data centers, we support these typical deployment patterns.
Top-of-Rack and Server / GPU Connectivity
The most common 25G use case is connecting ToR switches directly to servers and GPU nodes within racks or across adjacent racks. Short-reach SFP28 SR modules and 25G SFP28 DAC cables handle same-rack server links, while AOC covers cross-row runs. In AI and ML clusters, each GPU server typically has multiple 25G SFP28 ports that aggregate up to 100G spine links via 4×25G breakout, enabling high-throughput, low-latency training traffic with no bottleneck at the access layer.
Leaf–Spine 25G / 100G Fabrics
In leaf-spine architectures, leaf switches face servers and GPU nodes via 25G SFP28 downlinks, while uplinks to spine switches run at 100G or 400G. SFP28 SR and LR modules handle the leaf-layer access side depending on rack distances and fiber type. This design provides predictable bandwidth and low oversubscription, making it the standard topology for hyperscale data centers, cloud infrastructure, and large enterprise deployments scaling beyond 10G access.
Mobile Backhaul, 5G, and AI Backhaul
25G SFP28 CWDM and DWDM modules are widely deployed in 5G fronthaul, midhaul, and mobile backhaul networks where CPRI or eCPRI interfaces require precise wavelength control and low latency. In edge data centers, 25G SFP28 LR or CWDM modules interconnect distributed compute nodes to centralized aggregation over existing single-mode fiber. AI backhaul traffic between training clusters and inference endpoints also benefits from 25G links, which provide sufficient throughput at lower cost than 100G for individual node connections.
Selection Guide
Technical Specs & How to Choose
25G SFP28 optics operate at 25.78 Gbps (IEEE 802.3by) and cover wavelengths from 850 nm to ITU DWDM grids. Selecting the right 25G SFP28 module comes down to three questions: how far is the link, what fiber is already installed, and is the link inside one building or spanning multiple sites?
Short-reach links (< 100 m)
Use SFP28 SR on OM3/OM4 MMF, or a 25G SFP28 DAC for same-rack connections. DAC eliminates transceiver cost and delivers the lowest latency for AI cluster fabric links.
Medium-reach links (100 m – 10 km)
Use SFP28 LR on OS2 SMF. This covers inter-building campus links, data center inter-row connections over SMF, and short metro access hops.
Long-reach links (10 km – 40 km)
Use SFP28 ER on OS2 SMF for metro aggregation, enterprise WAN edge, and ISP regional nodes. Verify optical budget with your fiber plant before deploying ER modules over longer spans.
Fiber-scarce or WDM deployments
Use SFP28 BiDi when only one fiber strand is available. Use CWDM or DWDM SFP28 when multiplexing multiple 25G channels over shared fiber for 5G backhaul or metro ring.
25G SFP28 Module Reference
| Type | Fiber | Wavelength | Distance | Use Case |
|---|---|---|---|---|
| SR | MMF | 850 nm | 70–100 m | TOR, in-rack, leaf-spine |
| LR | SMF | 1310 nm | ~10 km | Campus, inter-building, metro access |
| ER | SMF | 1310 nm | ~40 km | Metro aggregation, ISP regional |
| BiDi | SMF | 1270/1330 nm | ~10 km | Single-fiber links, fiber-scarce DC |
| CWDM | SMF | CWDM grid | ~40 km | 5G backhaul, ISP metro ring |
| DWDM | SMF | ITU C-band | 80 km+ | Dense backhaul, carrier backbone |
Compatibility & Testing
Tested on Real Hardware. Compatible Out of the Box.
As a third-party 25G SFP28 supplier, NodeOptic validates every module on actual switches and NICs before release. Cisco and Mellanox/NVIDIA-compatible 25G SFP28 modules, along with Juniper, Arista, Broadcom-based platforms, and HPE switches, are all covered with coding that matches OEM behavior including DOM support and DDM readout.
Supported Platforms
- • Cisco Nexus, NCS; Mellanox/NVIDIA Spectrum and ConnectX NICs
- • Juniper, Arista, Broadcom-based whitebox switches, HPE ProCurve/FlexFabric
- • Standards: IEEE 802.3by/cc, SFF-8402, SFF-8472 DDM
Testing Process
- • Platform interoperability tests on physical switches and NICs
- • BER tests, DOM readout verification, high/low temperature cycling
- • 72-hour burn-in and 100% individual optical power and wavelength test
- • Batch test reports available for network audit and qualification
Commercial Terms
Commercial Terms for 25G Projects
NodeOptic works directly with ISPs, data center operators, and system integrators on 25G rollouts. Our commercial terms are designed to make evaluation and volume procurement straightforward, whether you are qualifying a single sample or planning a large-scale 25G SFP28 wholesale order.
Samples & MOQ
- • Single-unit samples available for lab qualification
- • Low MOQ with no minimum enforced for initial evaluation
- • Volume pricing tiers from 10 units for larger 25G rollouts
- • Custom BiDi and CWDM/DWDM wavelengths available with agreed lead times
Lead Times & Stock
- • Standard SR, LR, and DAC/AOC SKUs ship within 1–3 business days from stock
- • Custom WDM and BiDi modules follow agreed production lead times
- • Blanket order and buffer stock arrangements available for ongoing projects
Warranty & Payment
- • 5-year warranty on all 25G SFP28 modules and DAC/AOC cables
- • Proactive RMA with fast replacement and root-cause reporting
- • Wire transfer, PayPal, and credit terms for qualified accounts
- • 25G SFP28 wholesale pricing for ISPs, resellers, and data center teams
Next Step
Share Your 25G Requirements, Get a Matched BOM
Tell us your ToR and leaf switch models, server or GPU port counts, link distances, and whether you need breakout (e.g. 100G → 4×25G). As your 25G SFP28 transceiver supplier and manufacturer, we will return a full SKU list with OEM part number replacements and wholesale pricing within one business day.
1
Send us your 25G switch and server/GPU port requirements, distances, and any breakout needs.
2
We propose a matched list of 25G SFP28 optics and DAC/AOC cables with OEM alternatives and pricing.
3
You validate samples in your environment and move to volume deployment with our ongoing support.