Dual-drive push-pull optical modulator with electrical common-mode suppression
US10295847B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2017 |
| Grant date | May 21, 2019 |
| Priority date | — |
| Expiry date | Nov 21, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/126
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A dual-drive push-pull Mach-Zehnder modulator is provided that suppresses electrical common-mode signal components using differential input in order to mitigate parasitic phase shift effects. The modulator is configured with at least two phase shifting sections with each having a respective set of diodes. Drive signals for each phase shifter are swapped by swapping two waveguide arms in which the first and second set of diodes are constructed in a particular configuration such that the electric field applied by each drive signal in the second set of diodes is the negative of what such signal was in the first set of set of diodes. As the input optical signal propagates through the first waveguide arm and the second waveguide arm, each arm independently modulates the phase which are then re-combined to provide an optical output signal with at least one suppressed signal component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.