Photonic Crystal Fiber Landscape 2026 — PatSnap Eureka
Photonic Crystal Fiber Technology Landscape 2026
From kW-class laser delivery to EUV lithography metrology — map every PCF innovation signal across NTT, ASML, and emerging Chinese assignees using AI-powered patent intelligence.
Three Core PCF Technology Clusters
Photonic crystal fiber technology resolves into three distinguishable structural-functional categories, each with distinct optical mechanisms and target applications.
Index-Guiding PCF with Variable Hole Arrays
A solid silica core surrounded by a periodic arrangement of air holes reduces the effective cladding refractive index, achieving single-mode or few-mode propagation across wide wavelength ranges. Managing the hole diameter-to-pitch ratio (d/Λ) controls higher-order mode cutoff and effective area (Aeff). NTT's multi-year filing campaign targets kW-class delivery over 10–100 m propagation distances for industrial and medical laser systems.
kW-class · 10–100 m propagationPhotonic Bandgap PCF (PBG-PCF)
Light is confined by a bandgap rather than total internal reflection, enabling hollow-core propagation with ultra-low nonlinearity. This mechanism underpins ASML's broadband supercontinuum light sources for semiconductor wafer metrology, where mode purity control is achieved via a detection-feedback loop stabilising output mode and ensuring reproducible spectral broadening.
Ultra-low nonlinearity · EUV/DUV metrologyMulti-Core PCF for Spatial Multiplexing
Multiple defect cores are formed within a single microstructured cladding to enable spatial multiplexing. The Shenzhen Tongsheng New Materials Co. patent describes periodic dielectric hole arrays with N cores, each pitch-matched to an N-element VCSEL array — directly addressing fiber-count and spatial density problems in high-speed data center interconnects.
N-core VCSEL array · 70 Gb/s benchmarkLow-Dispersion / Low-Loss PCF Structures
Chinese assignees have concentrated on dispersion-engineered PCF structures optimized for the 400–1600 nm range. The Wuhan Mo Guang Technology patent introduces a double large-hole symmetric structure within a hexagonally arranged inner ring, creating a near-zero, flat dispersion profile tunable across 1200–1550 nm by adjusting structural parameters. Target applications include optical coherence tomography and supercontinuum generation.
Near-zero dispersion · 1200–1550 nmFrom Foundational Designs to Production-Grade Metrology
PCF-specific filings in this dataset span from 2014 to 2025, with a distinct cluster emerging post-2017. The 2014–2017 foundational phase saw NTT file a series of Japanese PCF patents establishing the core design methodology for high-power PCFs — specifically the graphical overlap method between Aeff regions and higher-order mode cutoff boundaries. These represent systematic design-space mapping rather than incremental improvements.
The 2018–2021 system integration phase brought ASML Netherlands B.V. into PCF patent activity, with filings focused on broadband light source integration for lithography metrology (EP 2023). This signals PCF moving from fiber-centric design to subsystem integration in precision instruments — a pattern tracked by WIPO as a hallmark of technology maturation.
The most recent 2022–2025 application diversification phase shows PCF entering semiconductor metrology (ASML, 2023, 2025), data center interconnects (Shenzhen Tongsheng, 2015; Beihang University, 2014), and low-dispersion designs for telecom (Wuhan Mo Guang Technology, 2023). The ASML CN filing dated November 2025 — still pending — represents the frontier of this dataset. PatSnap's patent intelligence platform tracks real-time status changes on all pending filings.
PCF Patent Data Visualised
Patent filing distributions across application domains and jurisdictions, derived from the PatSnap Eureka dataset spanning 2014–2025.
PCF Filing Distribution by Application Domain
High-power laser delivery dominates the dataset with 4 patents, followed by semiconductor metrology (2), data center interconnects (2), and dispersion engineering (1).
PCF Filing Activity Timeline (2014–2025)
Distinct cluster emerging post-2017 with NTT foundational filings, followed by ASML's entry in 2023 and the 2025 CN pending frontier filing.
Key PCF Patent Holders: Filing Details and Status
Every identifiable PCF-specific filing in the dataset, mapped by assignee, jurisdiction, year, and current status. Sourced from PatSnap patent analytics.
| Assignee | Patent Title | Year | Jurisdiction | Focus Area | Status |
|---|---|---|---|---|---|
| NTT (Japan) | Photonic crystal fiber and high-power optical transmission system | 2018 | JP | High-power PCF design | Active |
| NTT (Japan) | Photonic crystal fiber and high power optical transmission system | 2019 | JP | High-power PCF design | Active |
| NTT (Japan) | Photonic Crystal Fiber | 2019 | JP | High-power PCF design | Active |
| NTT (Japan) | photonic crystal fiber | 2017 | JP | High-power PCF design | Active |
| ASML Netherlands B.V. | Mode control of PCF based broadband light sources | 2023 | EP | Lithography metrology | Active |
| ASML Netherlands B.V. | Photonic crystal fiber (≥16 μm core, ≥200 nm bandwidth) | 2025 | CN | Lithography metrology | Pending |
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What the PCF Patent Landscape Means for Your R&D
Key strategic implications derived from the 2014–2025 patent dataset for IP teams, R&D directors, and technology strategists.
NTT's Structurally Strong High-Power Position
NTT holds multiple active JP patents across hole-ratio design methodology. Organizations seeking to develop competing high-power PCF products should conduct freedom-to-operate analysis against NTT's d/Λ–Λ design-space mapping claims before committing to fiber architectures. PatSnap's IP analytics platform enables systematic claim mapping.
ASML's Application-Locked Metrology IP
ASML's PCF IP is application-locked to metrology, but the mode-control feedback architecture (EP 2023) is method-level, not fiber-level. This creates white space for PCF manufacturers to supply fiber substrates without infringing, while system integrators face tighter clearance issues for complete broadband illumination modules.
Three Emerging Directions in Photonic Crystal Fiber
The most recent filings in the dataset point to three distinct innovation vectors that define the near-term PCF technology trajectory.
PCF in EUV/DUV Semiconductor Metrology
ASML's active EP patent and pending CN patent represent the newest application frontier. The 2025 CN filing specifies that small core sizes cause photon-induced contamination via nonlinear effects, and the solution — enlarging the core to ≥16 μm — directly counteracts intensity-driven degradation. This is a reliability and lifetime direction as much as a performance direction, signalling PCF entering production-grade metrology tool supply chains. Standards bodies like IEEE Photonics Society have highlighted PCF's role in precision metrology.
ASML CN 2025 · ≥16 μm core · PendingTunable Near-Zero Dispersion PCF Architecture
The double large-hole symmetric structure from Wuhan Mo Guang Technology introduces a new structural degree of freedom — asymmetric inner-ring hole sizing — that decouples the dispersion zero crossing from the lattice pitch, enabling post-design tuning across the 1200–1550 nm band. This simultaneously minimizes confinement loss, making it applicable to optical coherence tomography, fiber sensing, and supercontinuum generation. Explore the materials science implications on PatSnap.
Wuhan Mo Guang 2023 · 1200–1550 nm · ActiveClosed-Loop Mode Purity Management for Supercontinuum PCF Sources
ASML's EP patent introduces real-time pump coupling feedback as a system-level abstraction around PCF nonlinear physics. The pump coupling conditions — spatial alignment of the pump laser beam to the PCF core — are actively optimized using a detection-feedback loop to stabilize the output mode and ensure reproducible spectral broadening. This is distinct from fiber design patents and represents a control systems layer atop PCF, analogous to APC (automatic power control) in laser modules. The PatSnap customer case library documents how photonics teams use Eureka to navigate exactly this type of system-level IP.
ASML EP 2023 · Method-level patent · ActivePhotonic Crystal Fiber Technology — Key Questions Answered
Photonic crystal fiber (PCF) — also known as microstructured optical fiber — is a class of specialty fiber that uses periodic arrays of air holes or microstructures in the cladding to guide light through photonic bandgap or modified total internal reflection mechanisms.
PCF technology resolves into three distinguishable structural-functional categories: index-guiding PCF with variable hole arrays, photonic bandgap PCF (PBG-PCF) enabling hollow-core propagation with ultra-low nonlinearity, and multi-core PCF in which multiple defect cores are formed within a single microstructured cladding to enable spatial multiplexing.
NTT (Japan) is the most prolific PCF assignee in this dataset with at least 4 directly PCF-titled patents (2017–2019, JP jurisdiction). ASML Netherlands B.V. holds 2 PCF filings across EP (2023, active) and CN (2025, pending), positioning the company as the leading Western applicant for PCF in precision metrology.
PCF is attracting renewed attention for high-power laser transmission, semiconductor lithography metrology, broadband light generation, and data center interconnects. NTT's filings target kW-class delivery over 10–100 m for welding and medical ablation. ASML uses PCF for broadband illumination in overlay and focus metrology in EUV/DUV lithography systems.
Key foundational parameters recur across retrieved patents: hole ratio (area of holes per unit cross-sectional area), core diameter, and misalignment tolerance between the PCF central axis and the input laser oscillator. Managing the hole diameter-to-pitch ratio (d/Λ) controls higher-order mode cutoff and effective area (Aeff); engineering hole-spacing Λ balances large Aeff against bending loss.
The ASML CN filing specifies a core diameter of ≥16 μm and a transmission bandwidth of ≥200 nm, directly addressing nonlinear contamination artifacts from high-intensity focal spots. Small core sizes cause photon-induced contamination via nonlinear effects, and the solution — enlarging the core to ≥16 μm — directly counteracts intensity-driven degradation.
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References
- Photonic crystal fiber and high-power optical transmission system
- Photonic crystal fiber and high power optical transmission system
- Photonic Crystal Fiber
- photonic crystal fiber
- Mode control of photonic crystal fiber based broadband light sources
- Photonic crystal fiber (core diameter ≥16 μm, transmission bandwidth ≥200 nm)
- Low-dispersion low-loss photonic crystal fiber
- Connection structure of multi-core photonic crystal fiber and laser light source
- PCF coupler and manufacturing method
- Method, apparatus and program for evaluating characteristic of optical fiber
- WIPO — World Intellectual Property Organization
- IEEE Photonics Society
- European Patent Office (EPO)
All data and statistics on this page are sourced from the references above and from PatSnap's proprietary innovation intelligence platform. This landscape is derived from a targeted set of patent and literature records and represents a snapshot of innovation signals within this dataset only. It should not be interpreted as a comprehensive view of the full industry.
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