Optical alignment method and apparatus
US7443505B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2006 |
| Grant date | Oct 28, 2008 |
| Priority date | — |
| Expiry date | Dec 8, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/4204
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In disclosed optical alignment method and apparatus thereof, external reflection entering laser diode by feedback from transmission line of low cost bidirectional optical transceiver module without optical isolator for subscribers is reduced so as to reduce RIN considering high optical coupling efficiency. The external reflection is minimized using property that output current increases in proportion to external reflection during optical alignment. For optimal optical alignment, external reflection and RIN are previously measured according to optical alignment position between subassembly and optical fiber. Optimal position is determined by both light output and RIN, and predetermined ratio of the mPD output current of minimum RIN position to that of maximum light output power position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.