Integrated Photonics WDM Patents: Top Companies & Filing Trends 2026
Filing growth compares 2021 (339 records) with 2024 (188) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 3,849 records in scope (CR5), not by the ranked leaders only.
What this dataset covers
This landscape covers 3,849 published records matching wavelength division multiplexing and related multiplexer terms against integrated photonics, photonic circuit and silicon photonics language, spanning filings from 2015 through the 2026-07-31 cut-off. The scope pulls in both classical WDM transmission art and the newer silicon-photonics implementations that put the multiplexer on-die rather than in discrete optics.
Records carry IPC classes from optical elements through to digital data processing, reflecting a field that spans component physics, transmission systems and the switching layer above them. Because publication trails filing by roughly eighteen months, the final one or two years in any trend chart will always read lower than the true filing rate once the backlog clears.
Filing trend and technology composition
Two views of the same 3,849 records: how filing volume has moved year over year, and how those records distribute across IPC subclasses.
Filing trend, 2017–2026
Filings rose from 243 in 2017 to a peak of 378 in 2020, then declined; the comparable complete-year span shows 339 in 2021 falling 45% to 188 in 2024. Treat 2025 and 2026 as still filling in rather than as confirmation of a continued drop.
IPC subclass composition
G02B (optical elements & systems) appears in 48.6% of records, followed by H04B (transmission, general) at 28.7% and H04J (multiplex communication) at 20.0%. Because a record can carry multiple classes, these shares sum to well over 100% and should be read individually against the 3,849-record total, not against each other.
Shares are the percentage of the 3,849 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Integrated Photonics — On-Chip Wavelength-Division Multiplexing Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about integrated photonics — on-chip wavelength-division multiplexing patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaKey patents and citation anchors
Optical device, wavelength division multiplexing transmitter, wavelength division multiplexing receiver, and wavelength division multiplexing transmission and receiving system
An optical device includes a first port group of n ports, a second port, and a wavelength multiplexer/demultiplexer between them. Light beams of different wavelengths presented at the first ports are combined into a single output at the second port, and light entering the second port is separated back into its constituent wavelength channels for delivery to the first ports.Filed by Fujikura Ltd., published 2019-10-03 as US20190302363A1.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20170207600A1 | 3D photonic integration with light coupling elements | 297 |
| 2 | US7391520B2 | Fourier domain optical coherence tomography employing a swept multi-wavelength laser and a multi-channel rece… | 293 |
| 3 | US20030049003A1 | High index-contrast fiber waveguides and applications | 270 |
| 4 | US5394489A | Wavelength division multiplexed optical communication transmitters | 248 |
| 5 | US6275317B1 | Hybrid integration of a wavelength selectable laser source and optical amplifier/modulator | 222 |
| 6 | US8213751B1 | Electronic-integration compatible photonic integrated circuit and method for fabricating electronic-integrati… | 220 |
| 7 | US6243517B1 | Channel-switched cross-connect | 215 |
| 8 | US20250259085A1 | Convergent Intelligence Fabric for Multi-Domain Orchestration of Distributed Agents with Hierarchical Memory … | 212 |
| 9 | US20070002327A1 | Fourier domain optical coherence tomography employing a swept multi-wavelength laser and a multi-channel rece… | 191 |
| 10 | US6393185B1 | Differential waveguide pair | 189 |
Citation counts reflect an older-favouring effect: records from the 1990s and 2000s have had more years to accumulate citations than recent filings, so treat this table as a map of influential foundational art rather than a ranking of current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Four observations that follow directly from the filing, citation and concentration figures above.
Leadership is real but not dominant
The five leading assignees combine for 636 records against a 3,849-record field. That is enough to set direction on core multiplexer architectures, but it leaves the large majority of filings distributed across a long tail — worth checking individually before assuming a single company blocks a given approach.
Post-peak cooling, not a collapse
Filings fell from 339 in 2021 to 188 in 2024, a complete and comparable three-year window following the 2020 peak of 378. That pattern is consistent with a technology area moving from initial land-grab filing into consolidation around fewer, more defensible architectures.
Optics dominates, switching lags
Optical elements and systems (G02B) touch nearly half of all records, while switching and selecting (H04Q) and digital data processing (G06F) sit under 8% each. That gap suggests the component-level claim space is heavily worked while system-level integration and control claims remain comparatively open.
Foundational art is decades old
The most-cited record in scope dates to a 2017 publication built on coupling and integration concepts, alongside 1990s and 2000s art on swept-wavelength lasers and high-contrast waveguides still drawing heavy citation. New filings in this space are built directly on top of that older foundation.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to integrated photonics — on-chip wavelength-division multiplexing patent landscape, with the prior art for and against each one.
Where to take this analysis
The figures here describe the shape of the field. Turning that into a filing or freedom-to-operate decision means going deeper on specific claims and specific assignees.
Check freedom-to-operate on a specific architecture
Concentration at 16.5% for the top five means most architectures are not locked up by one filer, but a specific multiplexer design may still sit close to an existing claim.
Run a freedom-to-operate check in EurekaTrack momentum on assignees you compete with
Recent-year filing counts vary sharply by company, with several formerly active filers showing zero filings in the latest year — worth confirming whether that reflects a strategy shift or a publication lag.
Monitor assignee activity in EurekaMap the under-claimed branches before committing
Switching, control and digital-processing classes stay under 8% of records each, well below the optical-element core — a first mover in those branches faces thinner prior art.
Explore white space in EurekaCommon questions on this landscape
The leading assignee in this dataset holds 152 records, ahead of the fifth-ranked company at 100 and the tenth-ranked company at 75. Together the top five assignees account for 636 records, or 16.5% of the 3,849 records in scope, which means the majority of filings sit outside that leading group. This is a field with a visible leader but a substantial long tail, so competitive mapping needs to go beyond the top few names to be reliable.
Filing peaked at 378 records in 2020 and, over the last fully comparable three-year window, fell from 339 in 2021 to 188 in 2024, a 45% decline. That is a real cooling trend, not a data artefact, but it should not be read as the technology losing relevance — high filing density in earlier years often means core architectures are already claimed, pushing new work toward narrower or adjacent claims. Figures for 2025 and 2026 are still incomplete because publication lags filing by roughly eighteen months.
G02B, covering optical elements and systems, appears in 48.6% of the 3,849 records in scope, making it by far the most heavily populated class. H04B (transmission, general) and H04J (multiplex communication) follow at 28.7% and 20.0% respectively, while switching-related H04Q and data-processing G06F both sit under 8%. Because records can carry multiple IPC codes, these percentages overlap rather than summing to 100%, and the lighter classes are worth watching as areas with comparatively less claim density.
This Fujikura filing, published 2019-10-03, claims an optical device built around a first group of ports handling multiple wavelength channels and a second port connected through a wavelength multiplexer/demultiplexer. The core mechanism combines multiple wavelength-specific input signals into one output and reverses the process on receipt, describing a bidirectional WDM transmit/receive system. Anyone designing a multiplexer/demultiplexer with this port-group topology should review its claims closely before finalising a similar architecture.
The IPC composition points toward switching and selecting (H04Q, 7.4% of records) and digital data processing (G06F, 5.2%) as comparatively under-claimed relative to the optical-element core at 48.6%. That gap suggests programmable wavelength routing, WDM-aware signal processing and integrated switching fabrics carry lighter prior art than component-level multiplexer physics. Co-assignee activity is also limited, with only ten identified pairs in the dataset, indicating most filers are working independently rather than through joint development that might otherwise pre-empt a given approach.
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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.