400G Long-Distance Optical Transceiver Available Now

High-performance 400G long-distance optical transceivers, including Cisco QSFP-DD Ultra Long Haul and ER4 modules, are available for distances from 40 km up to ultra-long-haul DWDM networks. Key Available Options1. Cisco 400G QSFP-DD Ultra Long Haul (ULH) Coherent ModuleSupports ultra-long-haul DWDM networks with both C-band and L-band operation.

Mechanically compliant with QSFP-DD Type 2A and fits within a 24W power envelope. Uses duplex LC connectors over single-mode fiber with coherent signals up to 118 Gbaud. Offers multiple application select codes for 75–112.

5 GHz channel spacing, optimizing spectral efficiency or reach. Compatible with Cisco and third-party routers and switches, reducing operational costs due to lower power and cooling requirements. 2.

400G QSFP-DD ER4 Optical TransceiverDesigned for long-reach 400GbE connectivity up to 40 km over single-mode fiber. Uses four wavelength channels around 1310 nm with duplex LC connectors. Ideal for data center interconnects, cloud computing, AI workloads, and storage replication.

Provides high interoperability and vendor compatibility, simplifying integration into existing network infrastructure. 3. Cisco 400G QSFP-DD High-Power (Bright) Optical ModuleFeatures enhanced Tx power (+1 dBm) for extended reach in metro, DCI, and campus interconnects.

Supports Ethernet and multirate OTN clients, with coherent DP-mQAM signaling in the C-band. Includes Layer-1 security features such as AES-256 GCM encryption for secure transmission. 4.

400G DR4/FR4/VR4 TransceiversMedium to long-distance solutions for single-mode fiber networks, supporting distances from 100 m to 2 km. Leverages PAM4 modulation and wavelength multiplexing for high-speed, power-efficient transmission. Available in QSFP-DD and OSFP form factors, compatible with modern data center and telecom infrastructures.

Considerations for Selection

Distance Requirements: ER4 modules are suitable for up to 40 km, while ULH modules support ultra-long-haul DWDM links. Form Factor: QSFP-DD is widely supported; OSFP may be preferred for certain high-density deployments. Power and Cooling: ULH and high-power modules are optimized for lower power consumption relative to traditional transponders.

Compatibility: Ensure the transceiver is compatible with your existing routers, switches, or DWDM systems. Application Needs: Consider whether your network requires high spectral efficiency, multi-rate support, or secure Layer-1 transmission. These 400G long-distance optical transceivers are currently available from vendors like Cisco and SATE Optics, providing scalable solutions for modern high-capacity networks.