Optical Fiber Sensing Patents: Who Leads, Trends 2026
- Filings peaked in 2022 at 51, then declined through the most recent partial year — a flat-to-declining trend rather than sustained growth.
- China draws the largest share of filings by far, with 254 records at its receiving office against 115 in the United States and smaller shares in Europe, WIPO, Canada and the UK.
- Recent-year momentum is thin even among the most active filers, with several leading assignees showing zero filings or a sharp year-on-year drop in the latest tracked year.
What the filing record shows
Optical fiber sensing covers distributed and point-sensor architectures that use light in a fiber to measure strain, temperature, vibration or pressure over distance — from Brillouin-scattering interrogators to fiber Bragg grating arrays. The 528 patent families in this dataset span the period from 2015 through the 2026 cut-off, concentrated under G01D (measuring and recording) and G01K (temperature measurement), with meaningful secondary activity in G02B optical elements, G01B length measurement and G01L pressure sensing.
Filing activity rose to a peak in 2022 and has since eased, though the most recent year is necessarily undercounted because publication typically lags filing by around 18 months. China's receiving office accounts for the largest single share of records, well ahead of the United States, with Europe, the WIPO PCT route, Canada and the United Kingdom making up smaller, roughly comparable slices.
Filing trend and technology composition
Two views of the same 528-family dataset: the year-by-year filing curve and the IPC subclass breakdown that shows where the claim density actually sits.
A peak in 2022, then a pullback
Annual filings ran from 29 in 2017 to a high of 51 in 2022, before falling back toward 8 in the latest, still-partial year. Read the most recent one or two years as a floor, not a ceiling, given publication lag.
Measurement and temperature dominate the IPC mix
G01D and G01K together account for the majority of tagged records, confirming this is primarily a measurement-and-recording field built on top of optical hardware in G02B, with force, vibration, geophysics and transmission subclasses forming smaller adjacent clusters.
Shares are the percentage of the 528 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Optical Fiber Sensing Systems with Eureka
This page is one run against one query. Ask Eureka your own question about optical fiber sensing systems and every answer comes back with the patent numbers behind it.
Try EurekaThe documents other filings build on
Dual Brillouin distributed optical fiber sensor and sensing method (KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY)
The filing describes a dual-Brillouin distributed sensing system that simultaneously measures multiple correlation points along a fiber under test using a pulsed-gated pump signal and a continuous-wave probe signal, then re-measures the identified event area with a pulsed-gated probe against the pump — a two-pass scheme aimed at combining fast event detection with precise localization in a single distributed sensor.Filed 2021-05-20; number and assignee rendered from source record.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5757487A | Methods and apparatus for distributed optical fiber sensing of strain or multiple parameters | 191 |
| 2 | US20020025097A1 | Method and devices for time domain demultiplexing of serial fiber bragg grating sensor arrays | 135 |
| 3 | US20050094129A1 | Combined Bragg grating wavelength interrogator and brillouin backscattering measuring instrument | 82 |
| 4 | US6212306B1 | Method and device for time domain demultiplexing of serial fiber Bragg grating sensor arrays | 79 |
| 5 | CN107917738A | 一种同时测量温度、应变和振动的分布式光纤传感系统 | 72 |
| 6 | CN103123285A | 基于混沌激光相干法的分布式光纤传感装置及其测量方法 | 69 |
| 7 | US20100329602A1 | Smart fastener and smart insert for a fastener using fiber bragg gratings to measure strain and temperature | 68 |
| 8 | US6647160B1 | Fiber bragg grating sensor system | 63 |
| 9 | CN102052930A | 光纤光栅分布式应变传感器及其应变监测方法 | 56 |
| 10 | US6571027B2 | Method and devices for time domain demultiplexing of serial fiber bragg grating sensor arrays | 55 |
Citation counts are drawn from a searched corpus and favour older filings; use them as a signal of influence on the field's vocabulary and architecture, not of current commercial weight.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-outs from the dataset that matter more than the raw count of 528 families.
Growth has already crested
The filing curve rose from 29 in 2017 to a peak of 51 in 2022 and has fallen since. Combined with an 18-month publication lag, the true recent-year count is higher than 8, but the trajectory since the 2022 peak is downward, not flat.
Filing activity is concentrated in China
China's receiving office holds roughly double the volume of the United States, with Europe, WIPO, Canada and the UK trailing well behind. Freedom-to-operate work should weight Chinese prior art heavily, not treat it as a secondary check.
Measurement and temperature carry the claim density
G01D and G01K together dominate the IPC composition, meaning most claim space is already occupied on core distributed-sensing and temperature-discrimination architectures. Adjacent subclasses like G01H vibration and H04B transmission carry far fewer records.
Even active filers have gone quiet recently
Assignees that built meaningful portfolios earlier in the period show zero filings or steep year-on-year declines in the latest tracked year, while newer entrants file in small, single-digit numbers. That pattern points to a field where the incumbent leaders are consolidating rather than expanding their claim footprint.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to optical fiber sensing systems, with the prior art for and against each one.
Who is filing, and where the field is still open
Filing activity concentrates among a small group of universities, corporates and specialist sensing firms, with a long tail of single or few-filing entrants behind them.
A university filer still active but slowing
Taiyuan University of Technology shows continued filing into the latest year, though at a reduced pace compared with the prior year, and appears in one of the dataset's co-assignee pairs alongside a Shanxi-based technology company.
The strongest co-assignee link in the dataset
Silixa and Chevron U.S.A. form the strongest co-assignee pairing recorded, at a strength of 8, consistent with fiber-optic sensing's established role in oilfield and geophysical monitoring alongside G01V-tagged filings.
Established corporates have paused recent filing
NEC Corporation and Corning Incorporated both show zero filings in the latest tracked year, despite earlier activity, which given the 18-month publication lag may understate work already in the pipeline rather than confirm a full stop.
| Assignee | Recent year | YoY |
|---|---|---|
| Taiyuan University of Technology | 4 | -43% |
| University of Electronic Science and Technology of China | 1 | — |
| Silixa Ltd. | 0 | -100% |
| NEC Laboratories America, Inc. | 0 | -100% |
| NEC Corporation | 0 | — |
| Corning Incorporated | 0 | — |
| Luna Innovations Incorporated | 0 | — |
| National Research Council of Canada | 0 | — |
Where to take this next
The filing record points to a maturing core and a thinner set of adjacent branches worth checking before committing a filing strategy.
Map freedom-to-operate against the China-heavy filing base
With 254 of 528 records at China's receiving office, an FTO review anchored only on US and EPO filings will miss the bulk of the prior art in this field.
Run an FTO screen in Eureka →Track the co-assignee pairs for partnership signals
The Silixa–Chevron U.S.A. pairing and the smaller academic-industry pairs suggest where operator-vendor or university-industry filing relationships are forming.
Explore assignee networks in Eureka →Watch for a filing rebound after the 2022 peak
Several leading assignees show zero or sharply reduced filings in the latest year; the next 12-18 months of publications will show whether that is a real slowdown or a lag artifact.
Set a monitoring alert in Eureka →Common questions about optical fiber sensing patents
The most-cited records in this dataset include early distributed strain-sensing patents such as US5757487A and time-domain demultiplexing patents for fiber Bragg grating sensor arrays like US20020025097A1 and US6212306B1. These older filings are foundational because later work builds on their measurement architectures, which is why they accumulate high citation counts inside a searched corpus. Citation volume favours older documents, so it should be read as a marker of influence on the field's vocabulary rather than a ranking of current commercial importance.
Filings rose from 29 in 2017 to a peak of 51 in 2022, then declined toward 8 in the most recent, still-partial year, which is a flat-to-declining pattern rather than sustained growth. Because publication typically lags filing by about 18 months, the last one to two years understate true filing activity, so the decline should not be read as final until later data fills in. Even accounting for that lag, the 2022 peak marks a clear high point that filing volume has not returned to since.
China's receiving office accounts for 254 of the 528 records in this dataset, more than double the 115 filed at the US receiving office. Europe, the WIPO PCT route, Canada and the United Kingdom each hold smaller, broadly comparable shares behind those two. Any competitive or freedom-to-operate analysis in this space needs to weight Chinese-language prior art heavily rather than treating it as a secondary market.
The IPC composition shows G01D (general measuring and recording) and G01K (temperature measurement) as the two dominant subclasses, with 344 and 227 tagged records respectively, well ahead of G02B optical elements, G01B length measurement and G01L pressure sensing. That concentration means core distributed-sensing and temperature-discrimination claim space is already dense. Smaller clusters in G01H vibration, H04B transmission and G01V geophysics represent comparatively thinner claim coverage.
Relative to the dense G01D and G01K clusters, areas like combined vibration-Brillouin interrogation, multi-parameter distributed demultiplexing, and fiber sensing tuned for subsea or geophysical monitoring show thinner filing density in this dataset. High-speed event localization methods, of the kind described in the representative KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY filing, also sit at a smaller intersection of subclasses. These are starting points for a novelty search, not confirmed gaps, since actual white space depends on claim-by-claim review rather than IPC counts alone.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.