Tunable polarization independent wavelength filter
US4390236A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Mar 19, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Tunable, polarization independent wavelength filtering is obtained in a circuit configuration comprising an input polarization selective coupler which separates the TM and TE mode waves. A first, wavelength selective mode converter, in the TE mode wavepath, converts the TE mode wave energy at the selected wavelength to the TM mode. Similarly, a second wavelength selective mode converter, located in the TM mode wavepath, converts the TM mode wave energy at the selected wavelength to the TE mode. An output polarization selective coupler combines the TE and TM mode wave energy at the selected wavelength in one output wavepath and combines the balance of the input signal in a second wavepath. By cascading a plurality of such circuits, each tuned to a different wavelength, a wavelength multiplexed signal can be demultiplexed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.