ROADM Patents: Who Leads, Where the Gaps Are 2026
- Filing has cooled since its 2017 peak. 48 families that year against a flat-to-declining midpoint of 31 in 2022, with the most recent year understated by publication lag.
- The named leaders have all gone quiet in the latest year. Huawei, Ciena, Tellabs Operations and NEC's US lab each show 0 filings and, where measurable, -100% year-on-year momentum.
- Claim density concentrates in switching and multiplexing, not modulation. H04J and G02B carry the bulk of the 608 records, while G02F (optical control/modulation) sits far behind at 74.
Filing growth compares 2021 (17 records) with 2024 (15) — 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 608 records in scope (CR5), not by the ranked leaders only.
What the ROADM patent record shows
Reconfigurable optical add-drop multiplexers sit at the junction of switching and optical transport, and the patent record reflects that: filings cluster around H04J (multiplex communication) and G02B (optical elements and systems), with H04Q (switching and selecting) close behind. The 608 families in this dataset span 2015 through the current filing year, with a clear peak in 2017 at 48 families and a flatter, lower plateau since. Colorless, directionless, contentionless architecture and switching-speed claims are the search terms that pull this corpus together, which means the dataset is weighted toward node-level architecture rather than component physics.
Most activity was filed through the United States receiving office (307 records), with Europe, the WIPO PCT route, China and Canada trailing well behind. That distribution says more about where applicants sought protection first than about where R&D physically happened, and it is worth reading alongside the assignee table rather than in isolation.
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Filing trend and technology composition
Two views of the same 608-family corpus: how filing volume has moved year over year, and how those filings split across IPC subclasses.
A peak in 2017, then a plateau
Annual filings ran from 48 in 2017 to a 2022 midpoint of 31, then continued flat or declining toward the present. Because publication typically lags filing by around 18 months, the last one to two years in this chart will always understate true filing activity — treat the tail as provisional, not as a real drop-off.
Switching and optics dominate, modulation trails
H04J (381 records) and G02B (315) are the two largest subclasses, followed by H04Q (196) and general transmission under H04B (144). G02F, covering optical control and modulation, holds only 74 records, and G01B/G01D measurement classes are minor at 6 each — a sign that measurement and validation claims around ROADM nodes are comparatively rare.
Shares are the percentage of the 608 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Reconfigurable Optical Add-Drop Multiplexers with Eureka
This page is one run against one query. Ask Eureka your own question about reconfigurable optical add-drop multiplexers and every answer comes back with the patent numbers behind it.
Try EurekaThe documents other filings cite most
US8116629B2 — Reconfigurable optical add drop multiplexer core device
A reconfigurable optical add drop multiplexer core device includes a light distributor, a light combiner, and first and second sets of add and drop ports. The light distributor receives an optical signal along a primary input and distributes it along subtending outputs; the light combiner receives signals along subtending inputs, combines them, and outputs the combined signal. The add and drop ports in the first and second sets function correspondingly, built around a coupling-ratio assigning procedure.Filed by Tellabs Operations, Inc.; granted 2012-02-14.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20090232497A1 | Directionless reconfigurable optical add-drop multiplexer systems and methods | 156 |
| 2 | US6285500B1 | Wavelength selective switch | 94 |
| 3 | US20080193133A1 | Scalable reconfigurable optical add-drop multiplexer | 82 |
| 4 | US20050036202A1 | Wavelength selective optical switch | 74 |
| 5 | US20160099851A1 | Method and system for optical connection validation in a reconfigurable optical add-drop multiplexer (ROADM) … | 70 |
| 6 | US20100221004A1 | Method for auto-configuration of a wavelength selective switch in an optical network | 65 |
| 7 | US7231107B1 | Flexible wavelength selective switch fabric with arbitrary add and drop capability | 63 |
| 8 | US20110286746A1 | Transponder Aggregator Without Wavelength Selector for Colorless and Directionless Multi-Degree ROADM Node | 61 |
| 9 | US20090220233A1 | Wavelength selective switch having distinct planes of operation | 57 |
| 10 | US20110164876A1 | Directionless reconfigurable optical add/drop multiplexer | 52 |
Citation counts here reflect influence within this searched corpus and skew toward older filings by construction; they are not a measure of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three read-outs from the trend, citation and IPC data that matter more for strategy than the raw counts alone.
The peak has passed, not just the count
Filings ran at 48 in 2017, held near 31 at the 2022 midpoint, and have declined since. Combined with a data cut-off of 2026-07-31, the last one to two years are undercounted by publication lag rather than by a genuine stop in R&D.
One directionless-ROADM filing anchors the field
The most-cited record in this corpus addresses directionless architecture specifically, with the next four most-cited records also concentrated on wavelength-selective switching. New entrants should expect prior-art searches in this area to surface these documents first.
Multiplexing and switching are crowded; modulation control is not
H04J and G02B together account for the majority of the 608 families, while G02F — optical control and modulation — sits at only 74. That gap does not mean modulation is unimportant to ROADM performance; it means fewer applicants have staked claims there.
Every major named assignee shows zero recent filings
Huawei, Ciena, Capella Photonics, Tellabs Operations, NEC's US laboratory and Ericsson all register 0 filings in the latest year, with -100% year-on-year momentum where measurable. That is consistent with publication lag but also with a maturing claim landscape where fewer new architectural filings are being made.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to reconfigurable optical add-drop multiplexers, with the prior art for and against each one.
Who holds the ROADM claim space
Filing concentrates among a small set of established optical-networking vendors, with co-assignment patterns pointing to specific inventor teams rather than broad joint ventures.
Tellabs Operations' filings trace to a small inventor core
The strongest co-assignee pairs in this dataset both involve Tellabs Operations paired with individual named inventors, each appearing together 9 times. That pattern suggests a concentrated internal team rather than distributed cross-company collaboration.
US filing dominates receiving-office counts
The United States accounts for 307 of the tracked records, more than double the EPO's 115 and well ahead of the WIPO PCT route at 69. China, at 26, and Canada, at 21, are comparatively minor filing destinations for this technology as searched.
No named assignee shows recent growth
Every assignee tracked for recent-year momentum — spanning Huawei, Ciena, Capella Photonics, Tellabs Operations, NEC's US lab and Ericsson — shows 0 filings in the latest year. Given publication lag, this likely overstates the slowdown, but the plateau visible from 2022 onward is independently supported by the trend data.
| Assignee | Recent year | YoY |
|---|---|---|
| Huawei Technologies Co., Ltd. | 0 | -100% |
| Ciena Corporation | 0 | -100% |
| Capella Photonics, Inc. | 0 | — |
| TELLABS OPERATIONS | 0 | — |
| NEC Laboratories America, Inc. | 0 | — |
| Telefonaktiebolaget LM Ericsson | 0 | — |
| Oclaro Israel Ltd. | 0 | — |
| Lumentum Operations LLC | 0 | — |
Where to take this from here
The trend and assignee data point to specific next steps depending on whether you're clearing a filing or scoping a design.
Check freedom to operate against the citation anchors
The five most-cited records, led by the directionless-ROADM filing at 156 citations, are the documents most likely to surface in an examiner's or competitor's prior-art search. Clear against these first before assuming a novel architecture is open.
Run a freedom-to-operate checkScope claims in the under-claimed sub-areas
Filter-shape optimization, switching-speed calibration and connection-validation claims all carry fewer records than the core multiplexing and switching classes. A first claim drafted around one of these branches has more room to establish a clean priority date.
Explore white space with EurekaCommon questions on ROADM patents
In this dataset, a ROADM patent claim typically covers a node architecture that can add, drop or pass through individual wavelength channels on an optical fiber without manual reconfiguration. The representative filing, US8116629B2, describes this as a light distributor and light combiner paired with add and drop ports governed by a coupling-ratio procedure. Most claims in the corpus sit under IPC classes H04J (multiplex communication), G02B (optical elements) and H04Q (switching), which tells you examiners will search across all three when assessing novelty.
The assignee ranking in this corpus is led by established optical-networking vendors including Huawei, Ciena, Capella Photonics, Tellabs Operations, NEC's US research laboratory and Ericsson. Tellabs Operations also shows the strongest co-assignee pairing pattern in the dataset, tied to specific named inventors rather than joint corporate filings. That said, every one of these named leaders shows zero filings in the most recent year, so current activity should be verified against fresher sources rather than assumed from this snapshot alone.
No — filing peaked at 48 families in 2017, held near 31 at the 2022 midpoint, and has trended flat to declining since. Because patent publication lags filing by roughly 18 months, the final one to two years in any trend chart will understate true activity, so the apparent drop to zero in the most recent year is partly an artifact of that lag rather than a full stop in R&D. Even accounting for that lag, the broader trajectory from 2017 to 2022 shows a real plateau rather than continued growth.
US8116629B2, assigned to Tellabs Operations and granted in February 2012, claims a ROADM core device built from a light distributor and light combiner working with paired add and drop port sets, governed by a coupling-ratio assigning procedure. It functions as a citation anchor in adjacent filings, meaning many later ROADM node-architecture applications reference it during examination. Anyone designing a similar add/drop core with ratio-based port assignment should review its specific claim language before finalizing an architecture, since it is one of the more heavily built-upon documents in this corpus.
The clearest gap sits in G02F (optical control and modulation), which holds only 74 records against 381 in H04J and 315 in G02B — modulation-side claims are simply less contested. Within the switching and architecture space, filter-shape optimization for wavelength-selective switches, switching-speed calibration, and optical connection validation for colorless-directionless-contentionless nodes also show comparatively thin coverage relative to the core multiplexing claims. Any of these branches offers more room for a first-filed claim than the crowded H04J/G02B core.
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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.