PacketLight Extends 400G Ultra-Long-Haul Reach to 4,000 Kilometers Enabling Cost-Efficient Transport

TEL AVIV, Israel - July 8, 2025 - PRLog -- PacketLight Networks, a leading provider of DWDM and OTN optical transport solutions, has extended the capabilities of its PL-4000T 1.6T 4x400G Transponder and PL-4000G 4.8T 12x400G Transponder solutions, enabling 400G transport across ultra-long-haul networks, up to 4,000 kilometers or 2,500 miles.

As global data traffic continues to rise exponentially and the need to support AI applications grows, network operators face increasing demand to build and interconnect existing networks across thousands of kilometers without sacrificing capacity, efficiency, or cost-effectiveness. PacketLight's solutions for 4,000-kilometer reach are ideal for long-distance backbones and transcontinental carrier networks.

The PL-4000T and PL-4000G support ultra-long-haul capabilities via a simple software upgrade. Powered by an 800G DSP chip, these systems feature advanced dual-polarization QPSK with probabilistic constellation shaping (PCS) to optimize spectral efficiency and resilience against noise and nonlinearities. Extensive dispersion compensation, high receiver sensitivity and advanced soft-decision FEC (SD-FEC)help maintain robust performance across long and challenging fiber spans.

"PacketLight enables customers to scale their existing networks with confidence and efficiency," said Koby Reshef, CEO of PacketLight Networks. "Our pay-as-you-grow approach removes distance barriers for high-speed networks, making ultra-long-haul transport simpler, more cost-efficient, and ready for future growth."

PacketLight's 400G transponders support these capabilities through advanced coherent optics, high-output amplifiers, and optimized receiver design, delivering top performance without hidden license fees. These features help operators extend their networks across thousands of kilometers while maintaining optimal performance, and also improve OSNR in metro network links to support 400G wavelengths over challenging routes.

About PacketLight Networks

PacketLight Networks (https://www.packetlight.com/) provides complete, carrier-grade DWDM and OTN transport solutions that are future-ready, cost-transparent, and free from vendor lock-in. Serving customers across telecom, AI-scale compute, data center interconnect, utilities, government, and media, PacketLight enables organizations to grow with confidence, maintain data privacy, and retain full control over their infrastructure. Trusted in 65+ countries, our high-capacity, ultra-low-latency platforms scale from metro to ultra-long-haul, supporting mission-critical infrastructure and next-generation services, delivering seamless scalability, embedded encryption, QKD readiness, and interoperability for ultra-high-performance networking.