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Croatian Single-Fiber Bidirectional QSFP-DD

ODN and passive infrastructure knowledge brief Published 11 Sep 2022

Prepared for preliminary research by the GESTIONVAL ODN knowledge desk. Confirm network topology, split ratio, box or cabinet capacity, joint closure rating and loss budget against current standards and product documentation.

Single-fiber bidirectional QSFP-DD modules enable simultaneous 400G data transmission and reception over a single optical fiber using wavelength multiplexing.Overview of QSFP-DD

QSFP-DD (Quad Small Form-Factor Pluggable Double Density) is a high-speed optical transceiver standard designed to support 400G, 800G, and even 1600G Ethernet connections. It extends the traditional QSFP form factor by adding an extra row of electrical contacts, allowing eight high-speed lanes to interface with the host system while maintaining backward compatibility with QSFP28 modules . QSFP-DD modules are widely used in data centers, high-performance computing networks, and service provider applications, offering high port density and flexible breakout options .

Single-Fiber Bidirectional (BiDi) Technology

Single-fiber bidirectional transmission allows simultaneous sending and receiving of data over a single optical fiber, unlike conventional dual-fiber systems that require separate fibers for transmit and receive . The core principles include:

  1. Wavelength-Differentiated Transmission: Each end of the link uses a different wavelength for transmitting and receiving (e.g., one end transmits at 1310nm and receives at 1550nm, while the other end does the opposite), ensuring interference-free bidirectional communication .
  2. WDM Coupler (Wavelength Division Multiplexer): This component combines two wavelengths onto a single fiber for transmission and separates them at the receiving end, enabling full-duplex operation without additional fibers .
  3. Efficiency and Resource Optimization: By using a single fiber instead of two, BiDi technology reduces fiber usage by 50% while maintaining the same transmission performance, which is particularly valuable in dense data center environments .
Applications and Advantages
  • Data Centers: Supports high-density 400G Ethernet links with reduced cabling complexity.
  • Telecom Networks: Enables long-reach 400G connections with fewer fibers.
  • Cost Efficiency: Reduces fiber infrastructure costs and simplifies network management.
  • Compatibility: QSFP-DD BiDi modules can often support breakout configurations, such as 4x100G lanes, while maintaining single-fiber operation .
Summary

Croatian Single-Fiber Bidirectional QSFP-DD modules combine the high-speed, high-density capabilities of QSFP-DD with single-fiber bidirectional technology, leveraging wavelength multiplexing to transmit and receive data simultaneously over one fiber. This approach optimizes fiber usage, reduces costs, and supports flexible deployment in modern data centers and telecom networks .

Croatian Single-Fiber Bidirectional QSFP-DD - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

Croatian Single-Fiber Bidirectional QSFP-DD

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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