High optical rejection optical spectrum analyzer/monochromator
US6930776B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2003 |
| Grant date | Aug 16, 2005 |
| Priority date | — |
| Expiry date | Jan 22, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/1819
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A dual-channel, double-filtering, multi-pass OSA having a narrow spectral linewidth response and high ORR comprises a diffraction grating (DG), two input ports (P1′, P1″) for directing first and second input light beams (LR, LT) onto the grating; a retroreflector (RAM1) for returning the dispersed light beams to the grating for dispersion again; two intermediate output ports (P2′, P2″) for receiving the twice-dispersed light beams; two secondary input ports (P3′, P3″) coupled to the intermediate output ports by polarization-maintaining waveguides (PMF2′, PMF2″) for directing the light beams onto the grating a third time, with their SOPs having a predetermined orientation relative to the SOPs of the first and second light beams when first incident upon the grating, the retroreflector (RAM1) returning the three-times-dispersed light beams to the grating for dispersion a fourth time; and two output ports (P4′, P4″) for receiving the light beams after dispersion the fourth time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.