Bias control of optical modulators
US10742324B1 · kind B1 · utility
10Cited by
8References
14Claims
0Family size
Assignee
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Key dates
| Filing date | May 21, 2019 |
| Grant date | Aug 11, 2020 |
| Priority date | — |
| Expiry date | May 21, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/5561
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A semiconductor-based Mach-Zehnder modulator (MZM) is configured for push-pull bias dithering to control the MZM bias at a desired set point. When two such MZM modulators are connected in parallel to form an IQ modulator, bias settings for both MZMs and the IQ bias may be controlled from an output of the IQ modulator to minimize both the IQ offset and the quadrature error of the output signal constellation even for non-ideal MZMs with low extinction ratios.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.