Planar lightwave filter device
US6816650B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 2003 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | May 30, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/055
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a method of processing an optical signal having a first amplitude frequency or gain frequency profile so as to produce a desired second amplitude frequency or gain frequency profile, the method comprising subjecting the signal to action by a plurality of chirped gratings each of which is designed to act upon a respective wavelength band of said signal and to remove at least a part of the radiation in said band and operating the gratings such that the proportion of the radiation removed from the respective band is such as to alter the first profile to the second profile within that band. The electrodes define a plurality of adjacent independently adjustable filter segments along the waveguide. Each filter segment functions over a specific range of wavelengths, where the center-to-center wavelength difference between adjacent segments and the wavelength bandwidth of each segment are defined in large part by the chirp in the grating. In a preferred embodiment of the invention, the grating is divided into two consecutive chirp regions, both of which span the desired wavelength band. The first chirp region is divided into a first group of independently adjustable …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.