Self-referencing tunable add-drop filters
US6751375B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 2002 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | Nov 1, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0213
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Techniques for adding and dropping a desired band, channel or wavelength by calibrating optical tunable devices precisely for the desired wavelength are disclosed. An optical path is formed and includes two tunable devices and a circulator coupled between the two tunable devices so as to prevent possible interference to channels and wavelengths passing through the two tunable devices. A small portion of a dropped signal is used as a reference signal to be introduced into the optical path. A reflected signal of the reference signal is coupled out of the optical path for determination of control signals most suitably for the two tunable devices so as to achieve an accurate control over an absolute wavelength of the tunable devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.