Fiber Optic QSFP28 Transceiver CBO QSFP28-100G-CWDM4 100G CWDM4

The BlueOptics Fiber Optic QSFP28 Transceiver CBO QSFP28-100G-CWDM4 100G CWDM4 is a hot-pluggable QSFP28 module for single-mode fiber links at 100 Gigabit Ethernet speeds. It implements CWDM4 wavelength multiplexing to carry four 25 Gbps lanes over a duplex single-mode fiber pair, enabling compact high-speed connectivity for data center interconnects, switch-to-switch links and metro aggregation. The module conforms to QSFP28 form factor and is intended for use in standard QSFP28 ports on switches and routers that support CWDM4 optics.

Advantages

This QSFP28 CWDM4 transceiver offers compact, hot-swappable installation and supports 100GbE over single-mode fiber with CWDM wavelength multiplexing, reducing fiber count while maintaining lane-parallel transmission. The module provides interoperability with QSFP28-compliant hosts, stable performance for short to medium reach single-mode links, and a standardized physical interface for straightforward replacement or upgrades in network equipment.

Suitable for

• Data center interconnects and spine-to-leaf links
• Switch-to-switch 100GbE connections
• Metro and campus aggregation links over single-mode fiber
• High-density rack-to-rack cabling where fiber count reduction is required

Key specifications

• Form factor: QSFP28 (hot-pluggable)
• Data rate: 100 Gigabit Ethernet (4 × 25 Gbps lanes)
• Transmission technology: CWDM4 coarse wavelength-division multiplexing
• Fiber type: Single-mode fiber (SMF)
• Connector: Duplex LC (typical for CWDM4 QSFP28 breakout)
• Typical reach: short to medium single-mode links (manufacturer guidance applies)

How to use

Install the QSFP28 module into a compatible QSFP28 port on your switch or router while the host is powered according to vendor guidance. Connect the duplex single-mode fiber cable with LC connectors, ensuring correct transmit/receive orientation. Monitor link status through the host device to confirm autonegotiation and lane alignment. For removal, follow hot-swap procedures recommended by the equipment manufacturer to avoid port damage or transient link interruptions.

Recommendations

Verify host compatibility with CWDM4 QSFP28 optics and check supported firmware versions before deployment. Use factory-quality single-mode fiber and LC connectors, and adhere to bend-radius and cleanliness best practices. For longer distances or different link requirements, consult link budget specifications and consider alternative transceiver types.