As 8K live production demands move from local setups to wide-area network (WAN) distribution, fiber efficiency is no longer an option—it is a necessity. The QSFP28 100G BIDI 20km transceiver represents the technical evolution of single-fiber interconnects, doubling the bandwidth density of existing G.652 single-mode fiber (SMF) plants while providing a critical 10km buffer over standard LR4 solutions.
| Parameter | 100G BIDI 10km | 100G BIDI 20km |
|---|---|---|
| Tx/Rx Wavelengths | 1271/1331nm | 1271/1331nm (WDM) |
| Optical Budget | ~6.3 dB | ~12.0 dB |
| Sensitivity (Avg) | -10.5 dBm | -14.5 dBm |
In real-world broadcast deployments, the physical distance of the fiber cable is only one part of the equation. Patch panels, splices, and optical splitters all contribute to the Insertion Loss (IL). While a standard 10km BIDI module may fail due to a thin link budget, the 20km variant (often referred to as 100G-BX20) provides an additional 3-4dB of margin, ensuring 8K video streams remain artifact-free.
A: Yes. BIDI technology requires a "U" (Upstream) and "D" (Downstream) module. The BX20-U typically transmits at 1271nm and receives at 1331nm, while the BX20-D operates in reverse. A link will not establish if two identical modules are used at both ends.
A: Our modules utilize high-performance DSPs that effectively manage Chromatic Dispersion across the 20km span. In 8K aggregation scenarios, we emphasize the use of host-side KP4 FEC to correct for any pre-FEC bit errors caused by the inherent signal-to-noise ratio of PAM4 modulation.
Critical Deployment Note: When deploying 20km BIDI links, ensure your Single-Mode Fiber (SMF) end-faces are pristine. Because the transmit and receive signals share a single fiber, back-reflections (ORL) from a dirty connector can significantly increase the noise floor.
For remote production teams, the 100G BIDI 20km is the primary choice for stadium-to-OB van backhaul. By utilizing only one fiber strand per 100G link, production companies can save up to 50% on fiber leasing costs while maintaining the massive throughput required for multiple uncompressed ultra-HD feeds. At Univiso, we integrate these high-efficiency optics into our core routers to ensure that our clients never have to compromise between distance and data density.
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