Optical wavelength tunable filter
AssigneeAlcatel
InventorsSabry Khalfallah, Joel Jacquet
Life of this patent
Estimating the term…
Abstract
The wavelength tunable optical filter (1) comprises a resonant cavity (4) delimited by two opposite reflective elements (8, 8′) which are not wavelength selective, and a reflector (7) external to the cavity (4). The external reflector (7) exhibits transmission peaks for an integer number N of optical frequencies and the Fabry-Perot cavity (4) delimiting a phase tuning section (11) is sized so that the distance between the optical frequencies of any two resonant modes of the cavity (4) is never equal to the difference between the optical frequencies of any two transmission peaks of the external reflector (7).
Claims8
An optical filter (1) tuneable for wavelength, comprising a Fabry-Pérot resonant cavity (4) delimited by two opposite reflective elements (8, 8′) not selective for wavelength, and a reflector (7) external to the said cavity (4), wherein the said external reflector (7) exhibits transmission peaks for an integer number N of optical frequencies, and the said Fabry-Pérot cavity (4) delimits a phase tuning section (11) and is sized so that the difference between the optical frequencies of any two resonant modes of the said cavity (4) is never equal to the difference between the optical frequencies of any two transmission peaks of the said external reflector (7).
A tuneable optical filter (1) as claimed in one of the preceding claims, wherein it also comprises an isolator (10) disposed at its entry.
Dependencies are inferred from the claim text.