SFP transceiver module BlueOptics SFP-21AH-BO 1250 Mbit/s

The BlueOptics SFP-21AH-BO 1250 Mbit/s is a single-mode fiber optic SFP transceiver module designed for 1000BASE-BX-U applications. Encased in a metal housing and weighing just 3 g, it operates from a 3.3 V supply and supports optical data transfer at up to 1250 Mbit/s over distances up to 40 km. The module uses an LC simplex interface for single-fiber bi-directional transmission with a transmitter wavelength around 1490 nm and a receiver wavelength around 1310 nm, following MSA form-factor standards for broad compatibility with network switches, routers and storage systems that accept SFP modules.

Advantages

The SFP-21AH-BO combines compact metal construction with industry-standard SFP compatibility, offering a lightweight and robust option for fiber links. It supports Digital Diagnostic Monitoring (DDM/DOM) compliant with SFF-8472 for real-time status of supply voltage, laser bias current, transmit power, receive power and temperature when the host hardware supports the feature. Built to MSA specifications and populated with high-quality optical and electronic components, this transceiver is intended for long operational lifetimes and stable 1.25 Gbit/s class performance on single-mode fiber.

Suitable for

Key specifications

How to use

Install the BlueOptics SFP-21AH-BO into a compatible SFP port on your switch, router or other network device while the host is powered down or following the device manufacturer’s hot-plugging guidelines. Connect an appropriate single-mode LC patch cable or patch panel to the LC simplex interface and ensure the remote transceiver is configured for the corresponding single-fiber bi-directional wavelengths. Verify link status and, if available, read DDM/DOM parameters from the host to confirm optical power levels and temperature are within expected ranges.

Recommendations

Use single-mode LC patch cords rated for long-distance transmission and avoid bending the fiber beyond its minimum bend radius. Confirm that the network device firmware or software supports third-party SFP modules and DDM/DOM if you intend to use diagnostic monitoring. For installation in multi-vendor environments, test interoperability and, when planning links near the 40 km maximum, verify optical budget and margin against connector, splice and fiber losses.