The dataset shows filing activity concentrated among a handful of established telecom and components companies, including Huawei, NTT, Fujitsu, Corning and Delta Electronics, though several of these show zero published filings in the most recent year. Rather than a single dominant leader, the field looks like a moderately concentrated top group followed by a long tail of smaller or single-filing entrants. Checking recent-year momentum matters as much as historical volume, since some of the largest historical filers have gone quiet.

Filing activity peaked in 2019 at 55 published families and has declined since, with the 2022 midpoint down to 32. This is a flat-to-declining trend rather than a growth trend, though the very latest years are understated because publication typically lags filing by about eighteen months. Anyone using this to judge market momentum should weight the 2019–2022 comparison more heavily than the last one or two years shown.

MEMS optical switch claims fall largely under B81B and B81C (microstructural devices and MEMS manufacturing), which together total only 107 of the 943 records in this dataset — a comparatively narrow slice. Silicon photonic and wavelength-selective switch claims sit mostly within G02B and G02F, the much larger optical elements and optical control classes. The practical implication is that MEMS-specific actuation and fabrication claims face less crowded prior art than claims touching the broader optical path or routing layer.

The United States leads with 389 receiving-office records, followed by Europe (EPO) at 154 and China at 116, with the WIPO PCT route contributing another 102 and Japan and Australia rounding out the set. No single office holds a majority, so a clearance search or competitive scan limited to one jurisdiction will miss a substantial share of the active filings. Given the PCT volume, many applicants are also keeping international options open rather than committing early to a single national route.

US9733432B2 covers a 3D-MEMS optical switch that integrates a PD array into the core switch alongside a collimator array, a wedge prism, a light-splitting triangular prism, a MEMS micro-mirror and a controller connected to both the PD array and the mirror. Its scope centres on that specific integration for simplifying the switch architecture and enabling in-line optical power detection. Work using a different power-monitoring approach, a different prism or splitting arrangement, or a switch architecture that does not integrate PD sensing into the core module would need its own freedom-to-operate analysis rather than assuming this patent controls the whole 3D-MEMS switch category.