Optical gain flattening filter using VPG-based optical elements
US6900932B2 · kind B2 · utility
11Cited by
9References
35Claims
0Family size
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Key dates
| Filing date | Sep 16, 2002 |
| Grant date | May 31, 2005 |
| Priority date | — |
| Expiry date | Jul 16, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S2301/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical gain flattening filter for attenuating the wavelength power levels of an optical beam to a threshold value. The filter has a series of volume phase gratings which each have a loss spectrum. The sum of the loss spectra for the volume phase gratings is about equal to the opposite of the gain spectrum of the optical amplifier. As the optical beam passes through the volume phase gratings, the sum of the loss spectra is added to the gain spectrum of the optical amplifier such that the optical beam is attenuated to the threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.