25G BiDi SFP28 40km Transceiver (Side B): BIDI-25G-SFP28-40B

EdgeOptic's BIDI-25G-SFP28-40B is a multi-vendor-compatible 25G BiDi SFP28 transceiver for 40 km single-mode fiber links, carrying the downstream wavelength assignment for the pair. It transmits at 1310 nm and receives at 1270 nm over G.652 SMF on a single LC/UPC connector with a 19 dB link budget. The matched far-end module is BIDI-25G-SFP28-40A, which transmits at 1270 nm and receives at 1310 nm to complete the bidirectional 25G link over a single fiber strand.

The optical front end uses a DML laser transmitter rated 0 to +6 dBm output power, with extinction ratio 3.5 dB minimum, and an APD receiver with minimum sensitivity of −19 dBm and overload point of −5 dBm. Receive wavelength bandwidth is 20 nm. Maximum power consumption is 1.5 W on a +3.3 V supply. SFF-8472 digital diagnostics expose live readouts for TX power, RX power, temperature, supply voltage, and laser bias for monitoring and troubleshooting.

Dual-rate operation covers 10G Ethernet (10.3125 Gbps) and 25G Ethernet (25.78125 Gbps), so the module can serve current 25G deployments and remain useful in mixed-rate aggregation roles. CPRI Option 10 and eCPRI are supported for 5G fronthaul transport. Host-side RS-FEC is strongly recommended for 25G long-reach operation; the module supports host FEC and port FEC mode depends on the switch platform and OS configuration. Operating temperature is 0°C to +70°C, with relative humidity 5 to 85 percent.

Typical deployments for a 25G BiDi SFP28 40 km module include 5G fronthaul links between baseband units and remote radio heads, mobile backhaul from cell sites into metro aggregation, central-office to access-node spans, and metro Ethernet trunks where strand count drives recurring cost. The single-strand BiDi architecture halves the fiber count for the same reach, which is the main reason it is preferred over dual-fiber 25G LR on dark-fiber leases and brownfield buildouts where conduit space is constrained. CPRI Option 10 and eCPRI support carries 5G-NR fronthaul transport directly on the 25G optic, removing the need for a separate framing layer between radio and switch. The 40 km class sits between 10 km LR reaches typical of intra-DC links and longer ER and ZR classes, covering most metro and tier-1 / tier-2 cell-site aggregation distances.

Compliance covers SFP28 MSA, SFF-8431, SFF-8432, SFF-8472, CE, RoHS, and Class 1 FDA + IEC 60825-1 laser safety. Multi-vendor coding is available so the module can be ordered for use across a broad set of switch and router platforms. For deployments that require operation at −45°C to +85°C, use BIDI-25G-SFP28-40BI paired with BIDI-25G-SFP28-40AI; commercial and industrial variants are not cross-compatible due to the different temperature rating.

Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. Made to order, 2-week lead time, lifetime warranty included. For platform-specific compatibility coding or volume pricing, contact our sales team.