This landscape search identifies 16 patent families published between 2015 and the 2026 data cut-off. That is a small corpus for a technology with active commercial and research interest, which means the field is still consolidating around a limited set of architectures rather than fragmenting across many competing designs. Because publication lags filing by roughly 18 months, the true recent-year count is likely somewhat higher than what is currently visible in the record.

The dataset shows a dispersed set of academic and institutional filers, including Ghent University, IMEC, ETH Zurich, the University of Maryland, and government-linked entities such as the US Department of Health and Human Services, alongside a smaller corporate presence led by Raytheon. None of these tracked assignees show filings in the most recent year, and no single filer holds a dominant share of the 16 families. This is a field without an established leader, which leaves the ranking genuinely open to new entrants.

A semiconductor mode-locked laser comb generates its comb lines directly from a laser cavity engineered to lock multiple longitudinal modes together, an approach reflected in highly-cited records like US20230208101A1. A microcavity comb, by contrast, pumps a passive resonator — such as a lithium niobate microcavity, as in US20210141283A1 — and relies on nonlinear four-wave mixing to generate the comb externally to the laser source. Both routes appear among the most-cited records in this corpus, indicating that neither approach has yet been clearly displaced by the other in the patent literature.

Relative to the dense H01S laser-source cluster, branches such as mid-infrared microcavity filtering, multimode gain-chip integration, dual-comb self-referencing on-chip, and RF-domain comb-to-oscillator coupling show thinner direct claim coverage. These are not untouched — individual records exist in each — but the claim density is low enough that a well-drafted first claim could establish a strong position without facing the same crowded prior art as the core laser-generation approaches. A formal freedom-to-operate search is still recommended before committing to any of these branches.

The United States receives the largest share of filings in this dataset at 10 of 16 records, followed by PCT applications through WIPO at 4, with single filings recorded at the Chinese and European patent offices. This US-centric pattern suggests that assignees seeking protection or enforcement outside the United States should verify whether priority filings were actually extended into those other jurisdictions, since the current record shows comparatively thin non-US coverage.