Method for calibrating a free-space-coupled fiber-optic transmission system
US6484114B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 2001 |
| Grant date | Nov 19, 2002 |
| Priority date | — |
| Expiry date | Aug 20, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/3556
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method is provided for calibrating a free-space-coupled fiber-optic transmission system. The method uses signal content in the measured coupled power at frequencies equal to the sum, difference, and first harmonics of the frequencies of control-related dither signals to infer and correct errors in the kinematical model used to apply the dithers. The technique can operate independently or simultaneously with dither-based functions such as alignment control and power attenuation to provide continuous tracking of model terms. The calibration method does not require that any calibration-specific signals be injected into the system, or that the operation of primary functions be halted for the purpose of calibration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.