Introduction
As data traffic continues to surge, network operators and enterprises face the challenge of extending 100G links over longer distances without complex infrastructure. That’s where 80km 100GBASE-BX80-U QSFP28 BIDI modules come in. BIDI, short for bidirectional, means these modules can transmit and receive data over a single fiber strand in both directions using different wavelengths. This dramatically reduces fiber requirements, simplifies cabling, and provides reliable long-haul connectivity.
How QSFP28 BIDI Modules Work
Unlike standard duplex QSFP28 modules, which use two fibers (one for transmit and one for receive), BIDI modules transmit data using two wavelengths over a single fiber. Typically, one wavelength, such as 1270nm, carries data in one direction, while the other, like 1330nm, carries data in the opposite direction. This approach halves fiber usage and reduces cable clutter, which is especially useful in legacy fiber paths or urban deployments where fiber availability is limited.
The QSFP28 BIDI module integrates four 25G channels, achieving a full 100G throughput. It is fully compliant with the IEEE 802.3bs and MSA standards, ensuring compatibility with modern switches and routers. Additionally, it supports hot-swapping, digital diagnostics monitoring (DDM), and low power consumption, making it suitable for data centers and service provider networks alike.
Advantages of 80km Reach
An 80km reach opens up opportunities for metropolitan area networks (MANs), campus interconnects, and regional enterprise links. For instance, a university with multiple campuses separated by tens of kilometers can rely on BIDI modules to establish high-speed links without laying additional fibers. Telecom carriers can offer 100G services to customers who are far from the nearest PoP, leveraging existing fiber infrastructure.
Extended reach also helps reduce reliance on optical amplifiers or repeaters, simplifying network design and lowering maintenance costs. By delivering long-haul performance in a compact QSFP28 form factor, BIDI modules help operators maximize both cost efficiency and network flexibility.
QSFP28 BIDI Real-World Deployments
One common deployment is connecting data centers within a metro area. A company might have two facilities 70 kilometers apart, and instead of investing in dark fiber leases or complex coherent optics, 80km 100GBASE-BX80-U QSFP28 BIDI modules allow direct links over existing fiber.
Another example is in regional service provider networks, where multiple business customers require high-bandwidth connections to the central office. BIDI modules reduce fiber usage, minimize installation complexity, and enable straightforward upgrades to 100G services.
Technical Considerations
While 100GBASE-BX80-U BIDI modules simplify fiber management, engineers must consider optical budget carefully. Losses over long fiber paths, connector quality, and splices all impact performance. Cleaning fiber connectors and verifying insertion loss are crucial. Modules typically support a wide optical budget and built-in DDM for monitoring real-time parameters like temperature, voltage, and optical power.
Power consumption remains modest, usually around 4–5W per module, allowing dense deployment without excessive heat generation. Compatibility with existing QSFP28 ports also simplifies upgrades and ensures that BIDI modules integrate smoothly into existing network infrastructures.
Market Perspective
QSFP28 BIDI adoption has grown as fiber constraints and high-speed requirements converge. Third-party suppliers like QSFPTEK have made modules more accessible and cost-effective, helping enterprises and carriers adopt high-capacity links without vendor lock-in. With data centers and cloud providers continuously expanding, demand for long-reach 100G solutions is expected to rise.
Future Outlook
While 400G and 800G networks are on the horizon, 100G BIDI modules will remain relevant for years. Their ability to deliver long-haul performance with minimal fiber requirements makes them ideal for transitional upgrades and legacy infrastructure. Operators can deploy 80km BIDI links today while planning for future higher-speed networks, ensuring a smooth, cost-effective evolution.
Conclusion
The 80km QSFP28 BIDI module solves a critical problem: extending 100G Ethernet over long distances with minimal fiber. Its combination of bidirectional transmission, high bandwidth, and operational simplicity makes it a cornerstone for metro networks, regional connectivity, and enterprise campus links. For organizations looking to maximize fiber efficiency without sacrificing speed, BIDI modules are a reliable, practical choice.
