LambdaGain Blog
Revolutionize Fiber Access Networks with 100G BiDi Optics
Upgrading Fiber Access Networks from 10G to 200G with QSFP28 100G BiDi Optics
The demand for bandwidth on fiber access networks is unstoppable. But operators are often stuck with duplex 10G links that no longer meet current or near-term demands.
What if the existing two-strand fiber infrastructure could deliver 200G of capacity—without major changes to the physical network?
This revolutionary change in the economics of fiber access is possible with new 100G BiDi technology.
Unlock 200G with the Network You Already Have
In most access and aggregation networks today, duplex 10G links deliver a total of 10 Gbps over 2 fibers.
QSFP28 100G BiDi (Bidirectional) optics fundamentally change that equation.
With BiDi technology, each fiber strand carries 100 Gbps bidirectionally using separate wavelengths. Over the same two fibers, operators can achieve a point-to-point connection delivering 200 Gbps total capacity—a 20× increase over legacy 10G links.
A simple optics swap—from 10G to 100G BiDi—enables:
- Dramatically higher bandwidth without new fiber builds
- Plug-and-play operation in the O-band
- Lower total cost of ownership compared to more complex transport alternatives
For many access and aggregation use cases, 200G of capacity over two fibers is more than sufficient. In these scenarios, QSFP28 100G BiDi optics offer a clean, efficient, and cost-effective upgrade path.
A Seamless and Future-Ready Upgrade Path
QSFP28 100G BiDi optics provide a direct evolution from legacy 10G duplex deployments to a dual-100G architecture—delivering immediate capacity gains without re-engineering the physical layer.
Because BiDi optics operate in the O-band, they can coexist with future coherent optics deployed in the C-band, preserving flexibility for long-term network evolution. This allows operators to reserve coherent solutions for applications that truly require extended reach or higher spectral efficiency, while using BiDi optics to address near-term bandwidth demands with minimal operational complexity.
The result is a strategic, incremental upgrade that balances performance, cost, and future readiness.
Real-World Applications
QSFP28 100G BiDi optics are well suited for a range of access and aggregation scenarios, including:
- PON / xPON Aggregation
Cost-effective 100G and 200G transport without rebuilding fiber routes - 5G RAN xHaul
High-capacity, low-latency links to support densification and small-cell deployments - Cable MSO Network Upgrades
Transport scale-up without disruptive fiber overbuilds
LambdaGain Solutions Snapshot
LambdaGain offers a comprehensive portfolio of QSFP28 100G BiDi transceivers designed to support access and aggregation network upgrades across diverse environments.
Our portfolio includes:
- Reach Options: 10 km, 20 km, 40 km, and 80 km
- Temperature Grades: Commercial and industrial variants available
- Form Factor: Standard QSFP28, interoperable and plug-and-play
- Application Ready: Optimized for access, edge, mobile xHaul, and aggregation networks
Whether you’re upgrading rural PON infrastructure, urban RAN deployments, or regional aggregation links, LambdaGain optics deliver the performance, reach, and reliability operators expect—at an economics profile that makes sense.
Final Thoughts
QSFP28 100G BiDi optics provide a smart, future-ready solution for scaling fiber access networks from 10G to 200G using existing infrastructure. They dramatically increase capacity while offering much lower costs and quicker time-to-market that network overbuilds. They are also a cost-effective replacement for coherent optics in many applications, while offering a practical bridge to coherent optics for the applications that truly demand coherent performance.
For many deployments, 100G Bidi is the right next step forward.
