Extend Your 10GbE Network with Bi-Directional SFP+ Fiber Transceiver (Up to 40km) SFP-10G-BX400D

Overview

The 10G Bi-Directional (BiDi) SFP+ Transceiver (SFP-10G-BX40) is a high-performance optical module designed for long-haul 10 Gigabit Ethernet applications. Capable of transmitting data up to 40 kilometers over a single strand of Single Mode Fiber (SMF), this module offers an efficient solution for Metro Area Networks (MANs) and inter-city connections.

Unlike standard dual-fiber “ER” modules, this BiDi transceiver utilizes Wavelength Division Multiplexing (WDM) to separate transmit and receive signals (typically 1270nm and 1330nm). This architecture allows network operators to double their fiber capacity instantly, enabling bidirectional 10G links on fiber plants that are otherwise capacity-constrained.

Key Features

• Extended Reach: Supports distances up to 40km (equivalent to 10GBASE-ER).
• High Speed: 10.3125 Gbps data rate.
• Simplex Operation: Uses a single fiber strand with a Simplex LC interface.
• Wavelength Pairs: Tx 1270nm / Rx 1330nm and Tx 1330nm / Rx 1270nm.
• Intelligent Monitoring: Built-in DDM/DOM for tracking optical power, voltage, and temperature.
• Reliability: Hot-pluggable with a metal enclosure for low EMI.

Applications

The SFP-10G-BX40 is optimized for scenarios requiring medium-to-long range connectivity without laying additional fiber:

• Metro Ethernet Rings: Connecting distribution nodes across a city.
• ISP Backhaul: Aggregating traffic from OLTs or access switches to the core network.
• Campus Interconnects: Linking distant buildings on large university or corporate campuses.
• Disaster Recovery: Creating backup links to secondary data centers located up to 40km away.

Specifications

Compatibility

This module follows the SFP+ Multi-Source Agreement (MSA) standards (SFF-8431, SFF-8472), ensuring broad compatibility with equipment from major vendors. It functions seamlessly in ports designed for 10G SFP+ optics on switches, routers, and firewalls from brands such as:

• Cisco (Compatible with SFP-10G-BXD-40km / BXU-40km specs)
• Juniper Networks
• Arista Networks
• Huawei
• MikroTik & Ubiquiti (EdgeMAX/UniFi)
• Dell Networking

Why Choose 40km BiDi?

While 10km modules are sufficient for most intra-campus links, the 40km BiDi SFP+ provides the necessary optical power budget for longer runs or links with multiple patch panels and splices that introduce attenuation. By using BiDi technology at this distance, you save significant costs on fiber leasing or trenching, as only one fiber strand is required per 10G link instead of two.

FAQ

1. Do I need to use these modules in pairs?

Yes. BiDi modules must always be used in matched pairs. If Side A is a “Downstream” module (Tx 1270nm / Rx 1330nm), Side B must be an “Upstream” module (Tx 1330nm / Rx 1270nm) to establish a link.

2. Can I use this 40km module for a 10km link?

Yes, but you should check the optical power levels. The 40km module transmits at a higher power than a 10km module. If the link is very short (e.g., < 2km), you might need a 5dB optical attenuator to prevent saturating or damaging the receiver. Always verify with the DDM readings.

3. What is the difference between this and the 20km version?

The primary difference is the optical power budget. The 40km version has a more powerful laser and a more sensitive receiver, allowing it to push signals through more fiber attenuation (loss) than the 20km version.

4. Will this work with Multimode Fiber (MMF)?

No. This transceiver is designed exclusively for Single Mode Fiber (OS1/OS2). Connecting it to Multimode fiber will result in massive signal dispersion and link failure.

5. Is the “BX400D” model unique?

The model number suffix (like 400D) is often vendor-specific, but the core specification—10G BiDi 40km—is standard. As long as the wavelengths (1270/1330nm) and distance (40km) match the transceiver on the other end, it will function correctly.