Tunable optical filtering device and method
US6839482B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 2002 |
| Grant date | Jan 4, 2005 |
| Priority date | — |
| Expiry date | Jun 17, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0018
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A tunable filter structure, and an optical method and device utilizing the same are presented for processing a multi-frequency light signal to separate therefrom a desired frequency range. The filter structure has an input for receiving the multi-frequency input light signal, a first output for outputting a first light component of the input light signal including light of said predetermined frequency range, a second output for outputting a second light component including a remaining portion of the input light signal, and an intermediate input. The first output and the intermediate input of the filter structure may be connected to, respectively, input and output of a tunable frequency-selective optical unit, which may be a second filter structure, amplifier, attenuator. By using the second filter structure with a different tuning range as compared to that of the first filter structure such that these tuning ranges define overlapping spectra of the filter structures, a two-stage filter device is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.