High resolution tunable optical filter
US6983090B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2003 |
| Grant date | Jan 3, 2006 |
| Priority date | — |
| Expiry date | May 27, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/3833
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A high-resolution tunable optical filter uses a dispersive element in a double pass configuration. The double pass configuration is provided by a reflective quarter-wave plate that conveniently reduces polarization dispersion loss (PDL) of the filter. The filter also includes a fibre tube for supporting an input optical fibre and an output optical fibre, and a lens having an optical axis, which is disposed such that a focal point thereof is substantially at one of the input and output optical fibres. To provide increase resolution the filter is tuned by rotating the reflective quarter-wave plate. To provide high power capabilities the fibre jackets of the input and output fibres are optionally stripped back. To provide a symmetrical spectral response the fibre tube is optionally mounted at an angle to the optical axis of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.