Standardizing the Edge: A Design Specification for 100G BIDI QSFP28 10km in Multi-Vendor Environments
Release date:Jan 22,2026

Core Optical Parameters

To ensure a bit-error-rate (BER) better than 5E-5 (pre-FEC) over a 10km span, the QSFP28 100G BIDI 10km must adhere to rigorous MSA SFF-8665 and IEEE 802.3bm standards. The following parameters define the operational window for Univiso engineering grade optics:

Form FactorQSFP28
ModulationPAM4 (25GBaud)
TX Wavelength (U)1271nm
RX Wavelength (U)1331nm
TX Power (Avg)-4.3 to +4.0 dBm
RX Sensitivity-10.5 dBm (Avg)

Multi-Vendor Interoperability Protocol

One of the primary challenges in deploying 100G BIDI technology is the "vendor lock" often encountered in host switch management interfaces. Univiso's 100G-BX10 transceivers utilize an unlocked EEPROM architecture, allowing for seamless integration with varied network operating systems (NOS).

  • CAUI-4 Electrical Interface: Fully compliant with 4x25G electrical lanes for high-speed switch backplanes.

  • EEPROM Customization: Supports vendor-specific coding for Cisco, Arista, Juniper, and Mellanox platforms.

  • Digital Diagnostic Monitoring (DDM): Real-time tracking of laser bias current, temperature, and optical power via I2C.

Thermal Management & Physical Constraints

Maintaining signal integrity over a 10km BIDI link requires strict adherence to thermal design power (TDP) limits. High-density edge switches often face airflow constraints; therefore, our 100G BIDI modules are engineered to operate within a Power Class 3 envelope (max 3.5W - 4.0W).

Engineering Design Tip: When designing 10km fiber spans, the chromatic dispersion at 1331nm is slightly higher than at 1271nm. Always calculate your link budget based on the 1331nm receiver's sensitivity to ensure the most conservative and reliable link performance.

Conclusion: A Uniform Standard for 100G

By strictly following the QSFP28 100G BIDI 10km design specification, network architects can confidently deploy high-bandwidth services while reducing physical fiber overhead. Whether aggregating 8K video feeds or interconnecting distributed data centers, the transition to single-fiber 100G is the most efficient path forward for 2026 and beyond.

Univiso ' s transceivers (SFPs) are designed to support multiple networks.

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