Low insertion loss optical monochromator
US6177992A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1998 |
| Grant date | Jan 23, 2001 |
| Priority date | — |
| Expiry date | Sep 25, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/447
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical monochromator has high signal selectivity and low insertion loss, and is well-suited for characterizing a variety of optical signals, including closely-spaced optical channels within DWDM systems. The optical monochromator includes a bulk-optic polarization beam splitter that separates orthogonal polarization states of an applied optical signal into separate optical beams. Low insertion loss is achieved by reconciling the polarization states of the separate optical beams to an optimum polarization state that minimizes insertion loss when the optical beams are applied to a dispersive element. High signal selectivity is achieved using a multipass configuration and by illuminating large areas of the dispersive element, since large beam diameters are accommodated by the bulk-optic polarization beam splitter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.