Method and apparatus for reducing non-linear characteristics of a signal modulator by cross-correlation
US6014241A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1998 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Jun 25, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/19
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A pilot signal is generated and injected into the input (108) of a signal modulator (104). The harmonic signal of a pilot signal produced at the output (110) and due to the non-linear transfer function of the signal modulator (104) is coherently sampled in the time domain to produce a plurality of digital samples defining a digital sample signal. The digital sample signal is cross-correlated with a reference signal having a phase based on the pilot signal to produce a cross-correlation signal. The bias voltage at which the signal modulator (104) is biased is adjusted to minimize the difference between the phase of the correlation signal and an optimum phase value corresponding to a linear mode of operation of the signal modulator 104.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.