Electro-absorption optical modulator including ground shield
US11681166B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 2020 |
| Grant date | Jun 20, 2023 |
| Priority date | — |
| Expiry date | Jun 22, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0265
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wideband electro-absorption modulating (EAM) device is configured to include a ground shield that functions to minimize the spread of an applied AC voltage beyond the limits of the modulator's electrode. The ground shield includes a grounding electrode disposed in a spaced-apart relationship with the modulator electrode along the ridge of the EAM structure, and a grounding termination used to couple the grounding electrode to a suitable ground location. The ground location may be either on-chip (such as the DC ground of the modulator itself) or off-chip (via an off-chip capacitor, with a wirebond connecting the grounding electrode to the capacitor). The use of a ground shield mitigates the effects that changes in the data rate have on effective length of the modulator as seen by the applied data signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.