Wide range optical wavelength fast detection for narrowband signal
US10767974B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2019 |
| Grant date | Sep 8, 2020 |
| Priority date | — |
| Expiry date | Dec 10, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2096
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A wavelength detection system may include one or more wavelength detection stages configured to receive at least a portion of an input light signal, where each stage may include a splitter to split a portion of the input light signal into two arms, a 90-degree optical hybrid, and two differential detectors configured to generate I-channel and Q-channel differential signals based on the outputs from the 90-degree optical hybrid. Further, a free spectral range is associated with an optical path length difference between the two arms of each stage. The system may further include a logic device to receive at least one set of detection signals including I and Q channel differential signals associated with different free spectral ranges and determine the wavelength of the input light signal based on an arctangent of a ratio of the Q-channel and I-channel differential signals for at least one set of detection signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.