Electro-absorption modulator with improved photocurrent uniformity
US12176677B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 2019 |
| Grant date | Dec 24, 2024 |
| Priority date | — |
| Expiry date | May 16, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed are integrated electro-absorption modulators (EAM) that are structured and/or operated to improve uniformity of the photocurrent density along the active region. In various embodiments, this improvement results from increased optical absorption at the rear of the EAM, e.g., as achieved by heating a region at the rear, increasing a bias voltage applied across the EAM towards the rear, or changing a material composition of an intrinsic layer towards the rear. In another embodiment, the improvement is achieved by coupling light from a waveguide into the EAM active region continuously along a length of the EAM, using overlap between a tapered section of the waveguide and the EAM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.