Wavelength monitoring device and controlling method thereof
US12107626B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2020 |
| Grant date | Oct 1, 2024 |
| Priority date | — |
| Expiry date | Apr 14, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0016
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A wavelength monitoring apparatus includes a wavelength monitoring circuit. The wavelength monitoring circuit includes: a split circuit that splits an input optical signal into two; an optical delay circuit that applies a delay time difference to the two split optical signals; and a two-input two-output optical multiplexer/demultiplexer circuit that outputs a result of applying multiplexing interference to the optical signals to which the delay time difference has been applied. The wavelength monitoring apparatus further includes photoelectric conversion elements that perform photoelectric conversions on the two optical signals output from the wavelength monitoring circuit so as to output electrical signals. The wavelength monitoring apparatus is configured to obtain the wavelength of the optical signal, by calculating a ratio between two electrical outputs of the photoelectric conversion elements and referring to a correspondence table indicating wavelengths of optical signals input to the wavelength monitoring circuit and ratios between electrical outputs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.