Multi-point self-calibration for broadband optical sensor interrogator
US12143156B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2022 |
| Grant date | Nov 12, 2024 |
| Priority date | — |
| Expiry date | Mar 17, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0204
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system and method for wavelength detection includes one or more detection stages configured for receiving at least a portion of an optical carrier. Each stage includes a splitter for splitting the signal into two arms. A 90-degree optical hybrid and in-phase (I-channel)/quadrature (Q-channel) differential detectors generate I-channel and Q-channel differential signals based on the hybrid outputs. A gas cell or like multi-point wavelength reference path also receives the input signal and provides a set of reference absorption wavelengths converted into the electrical domain by a reference photodetector. A logic device receives sets of detection signals (including I-channel and Q-channel differential signals and the set of reference wavelengths, all corresponding to a common measurement time) and determines a wavelength of the optical carrier based on an arctangent of a ratio of the Q-channel and I-channel differential signals, mapped to the set of reference absorption wavelengths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.