Single-fiber bidirectional QSFP solution
Single-fiber bidirectional QSFP modules enable 100G data transmission over a single optical fiber, maximizing fiber utilization and reducing infrastructure costs.
Overview
Single-fiber bidirectional (BiDi) QSFP modules allow full-duplex 100G transmission over a single optical fiber, effectively doubling the capacity of existing fiber infrastructure without laying additional fiber . These modules are ideal for access networks, data center interconnects, and edge deployments where fiber resources are limited.
Key Technologies and Products
- Coherent 100G ZR QSFP-DCO: Uses a dual-laser digital coherent optics (DCO) design with one laser for transmission and one for the local oscillator. It supports IP-over-DWDM transmission on a single fiber, enabling up to 10x capacity increase on existing 10G networks with low power consumption .
- Walsun 100G QSFP28 ZR4 BiDi: Employs a 4×25G NRZ scheme to achieve single-fiber bidirectional transmission over distances up to 80 km in KR4 FEC mode. It supports industrial-grade temperatures and consumes less than 6.5W .
- NEC 100G QSFP28 BiDi: Uses four wavelengths in the LWDM band for bidirectional transmission, achieving up to 80 km on a single fiber. This module enhances fiber utilization and reduces fiber costs .
- Cisco QSFP-100G-B20U4-I / B20D4-I: Operates in the O-band with low-power NRZ modulation and uses a diplexer filter to separate transmit and receive wavelengths, supporting full-duplex 100G over single-mode fiber up to 20 km .
- Skylane Optics QSFP28 ER1 ITEMP BiDi: Provides single-fiber 100G connectivity for distances up to 40 km, with industrial temperature support (-40°C to +85°C) and single-lambda operation for both transmit and receive channels .
Advantages
- Maximized fiber utilization: Single-fiber BiDi modules allow full-duplex communication without additional fiber deployment.
- Cost efficiency: Reduces the need for new fiber installation and lowers operational costs.
- Flexible deployment: Suitable for short-range data centers, metro networks, and long-distance interconnects.
- Low power consumption: Many modules operate under 6.5W, making them energy-efficient.
- High reliability: Industrial-grade temperature support ensures stable operation in diverse environments.
Considerations
- Distance limitations: Depending on the module, single-fiber BiDi QSFPs support ranges from 100 meters (OM4) to 80 km (ZR4).
- Modulation schemes: Options include NRZ, PAM4, and coherent optics, affecting reach and spectral efficiency.
- Compatibility: Ensure the module matches the network's existing fiber type (single-mode or multimode) and wavelength plan.
- Pairing requirement: BiDi modules typically operate in pairs, with one module at each fiber end. Single-fiber bidirectional QSFP solutions provide a practical and scalable approach to upgrading network capacity to 100G while minimizing fiber deployment costs and maximizing existing infrastructure efficiency .
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