Title:
TUNEABLE FILTER
Document Type and Number:
WIPO Patent Application WO/2018/229467
Kind Code:
A3
Abstract:
According to a first aspect of the present invention, there is provided an optical filter. The optical filter comprises first and second optical elements, and one or more expansion elements. The first and second optical elements are arranged along a common axis, each terminates in a flat surface perpendicular to the axis. The flat surfaces are separated by a gap having a width d, such that the flat surfaces form a Fabry-Perot etalon and light is transmittable along an optical path through the elements and the etalon. The one or more expansion elements are connected to the optical elements, located outside the optical path and extend parallel to the axis with a length greater than the width of the gap. The expansion elements comprise a material having a linear thermal coefficient of expansion different to that of the optical elements such that a difference in expansion of the expansion elements and the optical elements causes relative movement of the flat surfaces along the axis resulting in a change in the width of the gap.
Inventors:
JANSSEN ADRIAN PERRIN (GB)
Application Number:
PCT/GB2018/051586
Publication Date:
March 07, 2019
Filing Date:
June 11, 2018
Export Citation:
Assignee:
OCLARO TECH LTD (GB)
International Classes:
G01J3/26; G01J3/02; G02B26/00
Foreign References:
| US5212746A | 1993-05-18 | |||
| EP1146325A2 | 2001-10-17 | |||
| DE2756500A1 | 1979-06-21 | |||
| US5232962A | 1993-08-03 | |||
| US3697182A | 1972-10-10 | |||
| US20140362442A1 | 2014-12-11 |
Other References:
ANONYMOUS: "Kapton Heaters", 9 May 2017 (2017-05-09), XP055510955, Retrieved from the Internet [retrieved on 20180928]
Attorney, Agent or Firm:
TALBOT-PONSONBY, Daniel (GB)
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