India Single-Fiber Bidirectional QSFP

Single-fiber bidirectional QSFP transceivers enable high-speed 40G and 100G connectivity over a single optical fiber, optimizing fiber usage and supporting both short- and long-distance network deployments.

Overview

Single-fiber bidirectional (BiDi) QSFP transceivers allow simultaneous transmit and receive signals over a single fiber, reducing cabling requirements and enabling network upgrades without installing additional fiber. These modules are widely used in data centers, enterprise networks, and edge access networks where fiber resources are limited.

100G Single-Fiber BiDi QSFP

• Cisco QSFP-100G-B20U4-I / QSFP-100G-B20D4-I: Provides 100Gbps full-duplex connectivity over single-mode fiber up to 20 km. Operates in the O-band to minimize fiber dispersion and uses NRZ modulation. Each transceiver has 4 transmitters and 4 receivers, and they operate in pairs for full-duplex communication. Using two pairs can achieve 200Gbps bandwidth and network resiliency .
• Walsun 100G QSFP28 ZR4 BIDI: Supports single-fiber bidirectional transmission up to 80 km using a 4x25G NRZ scheme. Designed for long-distance, low-latency applications, including interconnection between cities, regional data centers, and 5G convergence rooms. Power consumption is under 6.5W, and it supports industrial-grade temperature ranges .

40G Single-Fiber BiDi QSFP

• HPE 40Gb QSFP+ BiDi Transceiver: Integrates four electrical data lanes in each direction over a single LC duplex fiber. Supports distances up to 100 meters on OM3/OM4 multimode fiber. Low power consumption (3.5W) and hot-pluggable design make it suitable for data center upgrades while reusing existing cabling .
• YXFiber YXF-QP-M85L-01D: A 40G QSFP+ module for short-distance duplex communication. Uses a single LC duplex fiber with four electrical channels, achieving 40Gbps total bandwidth. Supports 100m on OM3 and 150m on OM4 fiber, with nominal wavelengths of 850nm and 900nm on each end .
• QSFP-40G-SR-BD: Designed for short-reach multimode fiber, enabling 40GbE transmission with only two fibers, improving fiber utilization in data centers and simplifying cabling infrastructure .

Key Advantages

• Fiber Efficiency: Reduces the number of fibers required for high-speed links.
• Cost-Effective Upgrades: Allows network upgrades from 10G/40G to 40G/100G without new fiber installation.
• Flexibility: Supports both short-distance (OM3/OM4 multimode) and long-distance (single-mode) applications.
• Low Power Consumption: Typically ranges from 3.5W to 6.5W depending on the module and distance.
• Hot-Pluggable: Easy installation and replacement without network downtime.

Applications in India

These transceivers are suitable for:

• Enterprise data centers upgrading to 40G/100G networks.
• Telecom and 5G networks requiring long-distance interconnections.
• Edge access networks where fiber resources are limited.
• Inter-city or regional data center links for high-speed, low-latency connectivity. In India, these modules are available from vendors like Cisco, HPE, Walsun, and YXFiber, and can be sourced through authorized distributors or online enterprise networking suppliers.