We build tools for fiber optic network engineers and ISPs — from free browser-based calculators to commercial fault-location software that uses deterministic math, not AI guesswork, to find fiber breaks faster and cut downtime costs.
Fiber optic networks are the backbone of modern connectivity. When they fail, businesses go dark, emergency services are disrupted, and repair crews spend hours locating a fault that could be pinpointed in minutes with the right tools. Our mission is to build those tools — precise, practical, and accessible to every engineer who maintains the networks the world depends on.
Optical Path Engineering was founded by a fiber optic network engineer with hands-on experience designing, building, and troubleshooting real networks. Every tool we build comes from a genuine need encountered in the field — not a product roadmap meeting. Optical Path Engineering, LLC was officially formed on August 7, 2026.
We build software that engineers actually want to use: fast, technically accurate, free where it can be free, and priced fairly where it can't. We don't build for press releases or investor decks. We build for the technician on a ladder at 2am trying to find a cut cable.
Browser-based fiber-optic loss calculator. Compute path loss, power budget, link margin, and max distance for any SMF or MMF link. Used by engineers worldwide.
Seven free tools built for NOC teams and field engineers: SLA breach calculator, outage revenue impact, OTDR dead zone, cable slack correction, PON power budget, notification templates, and fiber color code reference.
Deterministic fiber fault location. Upload an OTDR trace, enter cable route addresses, and vault-slack-aware math pinpoints the break to within ~500 feet on a satellite map — with a ticket-scoped map and trace view for NOC/OSP/ISP teams. Manual Draw now doubles as an as-built capture tool too: place every splice, splitter, and tap at its real GPS coordinate as you build, branch off for real FTTx topology, attach the OTDR trace proving the loss at each splice, then export one GIS-ready package instead of doing as-built paperwork by hand. See pricing →
Auto-calculates power draw, HVAC load, generator runtime, and DC-plant capacity for a hub, headend, data center, or IT server room from what's actually installed — a live utilization dashboard in place of a manual spreadsheet audit. Part of the Facility Database System. Learn more →
Hub, rack, and device documentation with MUX/preterm chassis support and circuit tracing from device to customer — keeps facility records accurate without a manual spreadsheet audit. Part of the Facility Database System. Learn more →
The Optical Path Calculator handles every significant loss source in a real fiber-optic link:
All calculations run entirely in your browser. No data is ever transmitted to a server, no account is required, and the tool functions offline once loaded.
Open the calculator →Optical Path Calculator and the free ISP Operations Tool Suite above are live today. Beyond that, we're building a commercial platform — deterministic fiber fault location, ISP hub utilization, and inside-plant documentation — over at Optical Path Engineering.
See the full product roadmap →For demo requests or questions about licensing the commercial platform for your organization:
We typically respond within 1–2 business days. For bug reports and feature requests for the free tools, use the contact form.