Method for assembly of multi-ports optical apparatus
US7340130B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2005 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | Apr 4, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/327
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention describes a structure and method for a multi-ports WDM device for compensating the filter distortion while reducing insertion loss. The multi-ports WDM device comprises a 4-fiber collimator having a grin lens and a 2-fiber collimator having a lens where the focal plane of the second lens is shorter than the focal plane of the first grin lens Ands with aspheric surface. When a light signal travels through the first lens in the 4-fiber collimator to a filter, the film on the filter causes distortion to the light signal resulting in a large insertion loss. To compensate for the insertion loss, the lens on the 2-fiber collimator has a aspheric function and a shorter focal plane than the grin lens on the 4-fiber collimator. The type of grin lens used in the 4-fiber collimator is different than the lens used in the 2-fiber collimator. Effectively, the lens in the 2-fiber collimator operates to de-focus a light signal relative to the grin lens in the 4-fiber collimator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.