Device and method for filtering optical wavelengths
US6473540B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 2000 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Apr 26, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/055
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a device and to a method for the wavelength selective filtration of optical wavelength channels. The device includes at least one 3 dB-coupler or at least one Q port circulator (40), where Q≧3, a 1×N WDM-(de)multiplexer (30), where N≧2, N number of waveguides (31, 32, 33, 34, 35, 36, 37 and 38), at least N number of reflection sections (61, 62, 63, 64, 65, 66, 67 and 68) and at least N number of variable optical attenuators (71, 72, 73, 74, 75, 76, 77 and 78). One of the ports on the circulator (40) or on the 3 dB-coupler is connected to a first side of the WDM-(de)multiplexer (30). Each waveguide (31, 32, 33, 34, 35, 36, 37 and 38) includes at least one variable optical attenuator (71, 72, 73, 74, 75, 76, 77 and 78) and at least one reflection section (61, 62, 63, 64, 65, 66, 67 and 68), such that at least one variable optical attenuator (71, 72, 73, 74, 75, 76, 77 and 78) will be located between a reflection section (61, 62, 63, 64, 65, 66, 67 and 68) and the WDN-(de)multiplexer (30).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.