Supplier Single Fiber Bidirectional QSFP-DD

Single-fiber bidirectional (BiDi) QSFP transceivers deliver 100G connectivity over a single strand of single-mode fiber, effectively doubling fiber utilization while supporting distances from 10km up to 80km depending on the model.

Key Features

Bidirectional Transmission: BiDi QSFP modules transmit and receive data simultaneously over a single fiber strand using two distinct wavelengths, typically 1270/1330nm or 1291/1311nm, enabling full-duplex 100Gbps connectivity without requiring a second fiber. Reach and Performance: Cisco QSFP-100G-B20U4-I and QSFP-100G-B20D4-I support up to 20km on single-mode fiber using four multiplexed wavelengths in the O-band, providing full-duplex transmission.

Pro

Labs and NEC offer BiDi solutions with reach options up to 70–80km using LWDM or ZR4 technology, suitable for long-haul and metro networks.

Fiber

Mania and Innovalink provide 10km single-lambda BiDi modules for cost-effective metro and data center interconnects. Wavelength Multiplexing: Modules often use multiple transmitters and receivers combined via diplexers or CWDM grids. For example, Cisco's QSFP modules use four transmitters muxed into a single fiber, with receive wavelengths demultiplexed for full-duplex operation.

Pro

Labs and NEC use single-lambda or multi-wavelength approaches to optimize fiber efficiency. Connector and Form Factor: Most BiDi QSFP modules use a simplex LC connector and are hot-pluggable, compatible with QSFP28 MSA standards, IEEE 802. 3bs, and 100G Lambda specifications, ensuring interoperability across multiple vendors.

Applications: Data Center Interconnects (DCI): Efficiently doubles fiber capacity without additional cabling. Metro and Access Networks: Reduces deployment costs and simplifies fiber management. 5G Fronthaul and Enterprise Backbones: Supports high-density, low-power, and high-bandwidth requirements.

Environmental and Operational Range: Many BiDi modules support standard (0°C to 70°C) and industrial (-40°C to +85°C) temperature ranges, making them suitable for diverse deployment environments.

Advantages of Single-

Fiber Bi

Di QSFPFiber Savings: Reduces fiber usage by 50% compared to conventional dual-fiber transceivers. Cost Efficiency: Lowers infrastructure and deployment costs by using existing fiber. Scalability: Enables doubling of connections on the same fiber infrastructure.

Monitoring and Diagnostics: Integrated Digital Diagnostic Monitoring (DDM/DOM) allows real-time tracking of temperature, voltage, and optical power. SummarySingle-fiber bidirectional QSFP transceivers are a high-performance, cost-effective solution for 100G Ethernet deployments, offering full-duplex transmission over a single fiber, flexible reach options, and compatibility with major OEM switches and routers. They are ideal for data centers, metro networks, and telecom operators seeking to maximize fiber utilization and reduce deployment complexity.