Interferometer filters with compensation structure
US10534130B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2019 |
| Grant date | Jan 14, 2020 |
| Priority date | — |
| Expiry date | Jul 17, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/12159
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A Mach-Zehnder interferometer (MZI) filter comprising one or more passive compensation structures are described. The passive compensation structures yield MZI filters that are intrinsically tolerant to perturbations in waveguide dimensions and/or other ambient conditions. The use of n+1 waveguide widths can mitigate n different sources of perturbation to the filter. The use of at least three different waveguide widths for each Mach-Zehnder waveguide can alleviate sensitivity of filter performance to random width or temperature variations. A tolerance compensation portion is positioned between a first coupler section and a second coupler section, wherein the tolerance compensation portion includes a first compensation section having a second width, a second compensation section having a third width and a third compensation section having a fourth width, wherein the fourth width is greater than the third width and the third width is greater than the second width.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.