Channel power equalizer for a wavelength division multiplexed system
US6212315A · kind A · utility
39Cited by
5References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1998 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | Jul 7, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0221
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A dynamically and chromatically variable transmissivity apparatus (e.g., a channel equalizer or an add-drop circuit) controls channel powers in wavelength-division multiplexed systems. The input WDM signal is split into two components, in one component a phase shift is added to the wavelengths needing equalizing, the two signal components are then recombined. The phase shift added at each wavelength determines the amount of equalization obtained for that wavelength. For a decrease in equalization (i.e., attenuation) range the apparatus exhibits a decrease in insertion loss.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.