FiberLight

Zayo operates one of the most comprehensive fiber backbones across North America, offering dense metro fiber, extensive intercity dark fiber routes, and scalable 10G to 400G+ wavelength transport optimized for enterprise data center interconnect and hyperscale workloads.

Lumen maintains an expansive North American ultra-low-loss fiber footprint and Tier-1 IP backbone, offering high-capacity point-to-point wavelength services up to 400G and customizable dark fiber for enterprise WAN, AI workloads, and mission-critical cloud interconnects.

Operating AS1299—one of the world's most connected Tier-1 global IP backbones—Arelion provides carrier-grade DWDM wavelength services, global IP transit, and high-performance inter-data center transport across major North American metropolitan and long-haul corridors.

Crown Castle provides dense metro dark fiber assets and managed optical wavelength connectivity across major top-tier US metropolitan markets, delivering dedicated Layer 1 capacity between carrier hotels, enterprise sites, and data centers.

Uniti provides extensive long-haul and regional dark fiber and high-capacity wavelength transport across the Central and Southeastern United States, specifically tailored for enterprise DCI, carrier wholesale, and AI network interconnects.

Cogent operates a widespread multinational optical IP network connecting thousands of carrier-neutral data centers, providing high-bandwidth Optical Wave Services and high-capacity IP transit tailored for cost-effective enterprise DCI and backbone traffic.

AT&T Business provides ubiquitous enterprise optical infrastructure across North America, featuring metro and long-haul wavelength services up to 400G and private optical line services connecting enterprise sites to key carrier-neutral data centers and cloud on-ramps.

Verizon offers high-availability optical wave services, dark fiber, and Tier-1 IP transit across a vast US footprint, engineered to support latency-sensitive enterprise WAN architectures and high-throughput data center replication workloads.

FirstLight provides dense optical infrastructure and carrier-grade transport across the Northeast and Mid-Atlantic regions, offering low-latency wavelength and dark fiber links connecting key regional enterprise locations and colocation facilities.

Operates the largest independent lit transport and dark fiber footprint in North America, with deep Northeast and Mid-Atlantic metro density following its acquisition of Crown Castle's fiber infrastructure, delivering 400G/800G wavelengths, private optical networks, and comprehensive regional data center interconnection.

Specializes exclusively in the New York, New Jersey, Connecticut, and Greater Boston metro corridors, providing custom enterprise dark fiber, native 10G-800G optical wavelengths, and dedicated regional data center cross-connects across more than 20,000 route miles.

Anchors dense regional fiber throughout Upstate New York, New England, and parts of the Mid-Atlantic, owning over 25,000 route miles and 14 company-operated regional colocation data centers providing enterprise dark fiber and high-capacity wavelength transport.

Operates one of the most extensive independent fiber backbones in the Mid-Atlantic region (Virginia, West Virginia, North Carolina, and neighboring states), delivering high-capacity Layer 1 optical transport, dedicated dark fiber, and enterprise colocation facilities.

Provides extensive long-haul and metro fiber corridors linking Northeast and Mid-Atlantic financial hubs, offering 400G+ wavelength transport, bespoke dark fiber IRUs, and seamless connectivity to edge and enterprise colocation environments.

Maintains an incumbent fiber and conduit footprint spanning the entire Northeast and Mid-Atlantic corridor, delivering dedicated enterprise optical transport, private line services, and low-latency transport into tier-1 and carrier-neutral data centers.

Provides dedicated regional fiber infrastructure across western Pennsylvania, West Virginia, and northern Maryland, featuring hundreds of on-net data centers and business facilities with dark fiber, metro Ethernet, and wavelength transport options.

Deploys enterprise-grade fiber services over Comcast Business's national and Northeast regional backbone, supplying dedicated metro Ethernet, optical transport, and high-speed data center cross-connects.

Provides enterprise-grade optical transport, dedicated wavelength services, and dark fiber across New York City and Northern New Jersey, having expanded its data center on-ramps and footprint through strategic metro fiber acquisitions.