OIF Releases Critical 1600ZR Coherent Interface IA, Doubling Per-Wavelength Capacity for Data Center Interconnects to 1.6T

September 13, 2026

Morningstar (Business Wire) USA

Overview

The Optical Internetworking Forum (OIF) announced the ‘1600ZR Coherent Interface Implementation Agreement (IA),’ defining an interoperable 1.6T coherent line interface for data center interconnects (DCI) up to 120km. This IA doubles the capacity of existing 800ZR, enabling a single coherent wavelength to carry a single 1.6T Ethernet client. This addresses the urgent need for increased capacity in AI scale-across applications while controlling increases in power, cost, and physical footprint.

In Depth

Key Findings

The Optical Internetworking Forum (OIF) has released the ‘1600ZR Coherent Interface Implementation Agreement (IA),’ a new standard defining an interoperable 1.6T coherent line interface for data center interconnects (DCI) over distances up to 120km. This landmark agreement significantly doubles the per-wavelength capacity of existing 800ZR, enabling the transmission of a single 1.6T Ethernet client on a single coherent wavelength.

Technical Details

The 1600ZR IA was developed to address the urgent demand for increased capacity driven by today’s AI scale-across applications. This standard will enable unprecedented bandwidth delivery across wide-area networks (WANs) and metro networks connecting data centers. Technically, it integrates advanced coherent modulation techniques with forward error correction (FEC) to achieve high spectral efficiency while maintaining signal quality over long distances. This allows for a dramatic increase in data rates, maximizing the utilization of existing fiber optic infrastructure.

A critical feature of this IA is its ability to double capacity while controlling increases in power consumption, cost, and physical footprint. Data center operators will be able to deploy scalable solutions that meet the surging AI workload demands with minimal impact on existing optical infrastructure. Interoperability is also a key focus, ensuring seamless connectivity between equipment from different vendors, thereby enhancing network design and operational flexibility.

Background and Industry Context

The rapid evolution of AI, machine learning, and cloud computing has explosively increased data traffic volumes between data centers, necessitating continuous expansion of network capacity. Particularly, distributed training and inference of large AI models, along with real-time data processing, demand ultra-high-speed and high-capacity connections spanning multiple data centers. While the 800ZR standard is already widely adopted in the DCI market, the growth of AI workloads requires even higher bandwidth. The OIF’s announcement of the 1600ZR IA demonstrates the industry’s strong commitment to rapidly respond to this demand and standardize next-generation DCI solutions.

Outlook

The release of the 1600ZR IA marks a significant milestone in the optical communications industry, poised to accelerate the evolution of AI infrastructure. With the market introduction of 1.6T coherent modules compliant with this standard, data center operators will be able to handle rapidly expanding AI data flows while balancing performance and efficiency. In the future, 1600ZR technology is expected to be applied across broader distances and diverse network topologies, strengthening the foundation of global digital infrastructure. This will have long-term implications for data center design, operations, and investment strategies.

Source: https://www.morningstar.com/news/business-wire/20260909484293/oif-releases-critical-1600zr-coherent-interface-ia-doubling-capacity-per-wavelength-for-data-center-interconnects

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