Optical Amplifier Patents: Who Leads, Where the Gaps Are 2026
- Filing has cooled from its 2024 peak of 98 records. annual filings rose from 70 in 2017 to a peak of 98 in 2024, with 2022's 78 marking a flat midpoint — this is a mature claim space, not a growth curve.
- H01S dominates at 3,782 of 4,261 records. lasers and stimulated-emission claims outweigh transmission-layer claims (H04B, 2,037) by nearly 2:1, showing where the drafting pressure has concentrated.
- Co-filing is rare — only 10 pairs recorded. the strongest pair links NTT and Ando Electric at just six shared families, meaning most assignees in this space file solo rather than through joint ventures.
Filing growth compares 2021 (92 records) with 2024 (98) — 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 4,261 records in scope (CR5), not by the ranked leaders only.
What the optical amplifier patent record actually shows
Optical amplifier patenting spans three overlapping technical routes captured in this dataset: erbium-doped fiber amplifiers (EDFA) with gain-flattening claims, Raman amplification using distributed or discrete pumping, and semiconductor optical amplifiers (SOA) built on gain-medium and amplifier-stage architectures. The search string ties title/abstract language to IPC codes centred on H01S3/06, H04B10/29 and H01S5/50, so the corpus is deliberately narrowed to amplifier-stage and gain-medium claims rather than the broader fiber-optics field.
Filing volume has been essentially flat since the early 2020s after a run-up from 2017. Because publication typically lags filing by around 18 months, the low count recorded for the most recent year understates real filing activity rather than signalling an actual drop-off.
Filing trend and technology composition
Two views of the same 4,261-family corpus: how filing volume has moved year over year, and how those filings distribute across the IPC subclasses that define the technology's sub-domains.
A decade of flat-to-declining filing
Annual filings climbed from 70 in 2017 to a peak of 98 in 2024, passing through a midpoint of 78 in 2022. The trajectory reads as saturation rather than expansion: activity oscillates in a narrow band instead of compounding upward, consistent with a field where core amplifier-stage architectures are largely claimed and later filings refine rather than pioneer.
Lasers and stimulated emission dominate the IPC mix
H01S (lasers & stimulated emission) appears in 3,782 of 4,261 records, far ahead of H04B (transmission, 2,037), G02F (optical control & modulation, 907) and G02B (optical elements & systems, 843). H04J (multiplex communication, 637), H01L (semiconductor devices, 119), H04Q (switching, 67) and B82Y (nanotechnology, 57) trail well behind, marking the gain-medium and laser-stage physics as the densest claim territory and the switching/nanotech intersections as comparatively open.
Shares are the percentage of the 4,261 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Optical Amplifier Technology Landscape with Eureka
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Try EurekaThe records shaping this field's prior art
Gain-clamped semiconductor optical amplifier using Raman amplification principle
A gain-clamped semiconductor optical amplifier uses the Raman amplification principle. A Raman amplifier and a gain-clamped semiconductor optical amplifier are integrated onto one optical amplifier module. The design includes an optical fiber with Raman gain characteristics and a gain-clamped SOA that pumps light into that fiber via laser oscillation from a distributed Bragg reflector (DBR) lattice with asymmetrical input and output terminals, amplifying a Raman-amplified signal.Filed by Samsung Electronics, published 2004-12-16 — illustrates the hybrid Raman/SOA integration approach that recurs across the corpus's most-cited records.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7170910B2 | Evanescent-field optical amplifiers and lasers | 1,006 |
| 2 | US5566196A | Multiple core fiber laser and optical amplifier | 460 |
| 3 | US5867305A | Optical amplifier with high energy levels systems providing high peak powers | 413 |
| 4 | US20040033004A1 | Optical signal receiver photonic integrated circuit (RxPIC), an associated optical signal transmitter photoni… | 274 |
| 5 | US20030156605A1 | Pulsed light sources | 273 |
| 6 | US5778132A | Modular optical amplifier and cassette system | 254 |
| 7 | US5436759A | Cross-talk free, low-noise optical amplifier | 241 |
| 8 | US6275317B1 | Hybrid integration of a wavelength selectable laser source and optical amplifier/modulator | 222 |
| 9 | US5933271A | Optical amplifiers providing high peak powers with high energy levels | 218 |
| 10 | US5742416A | Bidirectional WDM optical communication systems with bidirectional optical amplifiers | 203 |
Citation counts inside a searched corpus favour older filings that have had more time to accumulate references — read them as a measure of influence on later filers, not as a ranking of current commercial relevance.
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Browse MCP servers →What the numbers mean for a filing decision
Three read-throughs from the trend, IPC and citation data that matter for anyone deciding where to file or where to look for freedom to operate.
Growth has plateaued, not accelerated
Filings rose steadily from 2017 to a 2024 peak of 98, with the 2022 midpoint at 78 confirming a flat trend rather than compounding growth. New entrants are competing in a claim space that has already absorbed a decade of core architecture patents.
Gain-medium and laser-stage claims are the densest territory
Nearly 9 in 10 records touch H01S, meaning gain-medium and stimulated-emission architecture is heavily claimed. Transmission-layer integration (H04B) and modulation (G02F) carry meaningfully less density, suggesting more room to differentiate at the system-integration layer than at the gain-medium layer.
A handful of older filings anchor the prior art graph
The most-cited record in the corpus, on evanescent-field optical amplifiers and lasers, draws over twice the citations of the next-ranked filing. That concentration signals a small set of foundational architectures that later filers routinely cite and design around.
Solo filing is the norm, not joint development
Only ten co-assignee pairs appear across 4,261 families, and the strongest, linking NTT and Ando Electric, spans just six shared families. Joint-venture filing is the exception in this field, which limits the value of tracking cross-licensing networks as a competitive signal.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to optical amplifier technology landscape, with the prior art for and against each one.
Who holds the ground, and where activity has stalled
Recent-year momentum data shows a striking pattern: the assignees with the largest historical portfolios in this dataset each recorded zero filings in the latest year, a signal consistent with the publication lag affecting recent-year counts across the board rather than an actual exit from the field.
NTT's portfolio shows no recent-year activity
Nippon Telegraph and Telephone appears among the assignees with zero filings recorded in the most recent year, alongside its co-filing partner Ando Electric — the two together form the strongest co-assignee pair in the dataset at six shared families.
Fujitsu and NEC show the same flat recent signal
Both Fujitsu and NEC sit in the same zero-recent-filing group as NTT, suggesting Japan-based telecom-equipment assignees filed their amplifier-stage claims earlier in the coverage window rather than in the most recent years.
Samsung and Alcatel also show flat recent momentum
Samsung Electronics — assignee of the representative Raman/SOA hybrid record in this dataset — and Alcatel both register zero filings in the latest year, matching the pattern seen across Corning and every other high-volume historical assignee tracked here.
| Assignee | Recent year | YoY |
|---|---|---|
| Fujitsu Limited | 0 | — |
| Nippon Telegraph and Telephone Corporation (NTT) | 0 | — |
| Samsung Electronics Co., Ltd. | 0 | — |
| Alcatel | 0 | — |
| Corning Incorporated | 0 | — |
| NEC Corporation | 0 | — |
| Furukawa Electric Co., Ltd. | 0 | — |
| Huawei Technologies Co., Ltd. | 0 | -100% |
Where to take this analysis
The trend and composition data point to a mature core with pockets of open claim space at the edges. Two directions follow directly from that.
Map freedom-to-operate against the H01S cluster
Before drafting a new gain-medium claim, check it against the small set of high-citation anchor records that dominate this corpus's prior art graph.
Explore in EurekaTrack the under-claimed intersections directly
Switching-fabric integration, nanophotonic gain media and semiconductor-device-level packaging show thinner IPC density than the core amplifier-stage cluster and are worth monitoring for new entrants.
Explore in EurekaCommon questions about optical amplifier patents
EDFA (erbium-doped fiber amplifier) claims typically centre on gain-flattening techniques within a doped fiber gain medium, Raman amplification claims cover distributed or discrete pumping schemes that amplify signal light directly within a transmission fiber, and SOA (semiconductor optical amplifier) claims cover solid-state gain-medium and amplifier-stage architectures, often integrated with laser oscillation components such as distributed Bragg reflectors. This dataset shows these three routes overlapping heavily in the IPC record, with H01S (lasers & stimulated emission) as the common denominator across nearly 90% of records. A single filing, such as the representative Samsung record in this dataset, can combine Raman and SOA elements in one module.
Not by the filing-count trend in this dataset: annual filings moved from 70 in 2017 to a 2024 peak of 98, passing through a flat midpoint of 78 in 2022, which reads as saturation rather than sustained growth. The very low count for the latest year is an artefact of the roughly 18-month lag between filing and publication, not a real collapse in activity. Overall, this looks like a mature technology area where claim space is heavily occupied rather than a field expanding into new territory.
The historical assignee ranking in this dataset is led by established telecom-equipment and semiconductor firms including NTT, Fujitsu, NEC, Samsung Electronics, Alcatel and Corning, each with substantial historical portfolios. Notably, every one of these major historical filers shows zero recorded filings in the most recent year, a pattern consistent across the board and best explained by publication lag rather than any single firm exiting the space. Co-filing is uncommon in this field — only ten co-assignee pairs appear across the entire corpus of 4,261 families.
IPC composition data points to several under-claimed intersections relative to the dense H01S gain-medium core: switching-fabric integration (H04Q, only 67 records), nanophotonic gain media (B82Y, 57 records) and semiconductor-device-level amplifier packaging (H01L, 119 records) all carry far lower filing density than the core gain-medium and transmission clusters. These thinner-claimed intersections are worth checking specifically because low IPC density in a well-established field usually means fewer blocking claims, not lower commercial relevance. Raman-EDFA hybrid pump architectures also appear less densely claimed than either technique filed alone.
Citation data shows meaningful concentration at the top: the most-cited record in this dataset, US7170910B2 on evanescent-field optical amplifiers and lasers, carries 1,006 citations, more than double the next-ranked record at 460. That gap indicates a small number of foundational filings that later applicants routinely cite and design claims around. For anyone drafting new gain-medium claims, checking against this handful of anchor records is a more efficient first step than a broad prior-art sweep.
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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.