HS-SFP-GE-BX40

Q: When is the BX40 the right choice?

When the link is too long for a 20 km BiDi module and fiber pairs are scarce: the BX40 carries full-duplex 1.25 Gb/s over one single-mode strand for 40 km using 1310/1550 nm WDM. It targets inter-campus links, metro rings and long CCTV backbones where pulling new fiber would dominate the project cost.

Q: What do I need for a complete BX40 link?

One A-side and one B-side module — A transmits at 1310 nm and receives at 1550 nm, B is mirrored — plus one clean single-mode strand rated for the distance. Specs match the BX20 family: -8 to -3 dBm TX, -24 dBm RX sensitivity, DDM diagnostics via SFF-8472, +3.3 V hot-pluggable operation under 1 W.

Q: Any deployment tips?

Check the optical path first: connectors, splices and patch panels all consume link budget, so measure or calculate attenuation before choosing 40 km over 20 km. DDM readout from the host switch shows real TX/RX levels, making link margin easy to verify at commissioning. Commercial 0 to +70 °C is standard; an industrial grade is available on request.

HS-SFP-GE-BX40

1.25G BiDi WDM SFP — single fiber, 40 km reach for metro links

1 × 1.25 Gb/s SFP, simplex LC (BiDi)A: TX 1310 / RX 1550 nm · B: TX 1550 / RX 1310 nm40 km on 9/125 µm SMF (single strand)1-Year Warranty

Single fiber, full-duplex 1.25 Gb/s

40 km on 9/125 µm SMF

DDM digital diagnostics

A/B pair ordering

Hot-pluggable, +3.3 V

Technical Specifications

Ports	1 × 1.25 Gb/s SFP, simplex LC (BiDi)
Wavelength	A: TX 1310 / RX 1550 nm · B: TX 1550 / RX 1310 nm
Transmission Distance	40 km on 9/125 µm SMF (single strand)
Power Input	+3.3 V
Power Consumption	< 1 W typical
TX Output Power	-8 ~ -3 dBm
Receiver Sensitivity	≤ -24 dBm
DDM	SFF-8472 DDM supported
Operating Temperature	0 ~ +70 °C (commercial) / industrial optional
Storage Temperature	-40 ~ +85 °C
Certifications	RoHS, IEC 60825 laser class 1

Ordering Information

Model	Description
HS-SFP-GE-BX40-SM1310 / SM1550	40 km single-fiber pair (A + B)

SC connector as default; FC/ST and other distances available on request. Power adapters: US plug default, EU/GB optional. SFP-slot models accept any MSA-compliant SFP module, including third-party brands (coding available on request).

FAQ

When is the BX40 the right choice?

When the link is too long for a 20 km BiDi module and fiber pairs are scarce: the BX40 carries full-duplex 1.25 Gb/s over one single-mode strand for 40 km using 1310/1550 nm WDM. It targets inter-campus links, metro rings and long CCTV backbones where pulling new fiber would dominate the project cost.

What do I need for a complete BX40 link?

One A-side and one B-side module — A transmits at 1310 nm and receives at 1550 nm, B is mirrored — plus one clean single-mode strand rated for the distance. Specs match the BX20 family: -8 to -3 dBm TX, -24 dBm RX sensitivity, DDM diagnostics via SFF-8472, +3.3 V hot-pluggable operation under 1 W.

Any deployment tips?

Check the optical path first: connectors, splices and patch panels all consume link budget, so measure or calculate attenuation before choosing 40 km over 20 km. DDM readout from the host switch shows real TX/RX levels, making link margin easy to verify at commissioning. Commercial 0 to +70 °C is standard; an industrial grade is available on request.