Optical modulator noise nonlinearity reduction circuit
US5166509A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1990 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Nov 9, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/588
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical modulator or laser source has a detector for detecting its output signal and for producing a corresponding output signal. A tapping device is connected to tap off a portion of the input modulation signal as a reference signal. The reference signal is compared and subtracted from the detector output signal by a subtraction unit in order to produce an error output signal which will be proportional to the laser noise/distortion components. This error signal is amplified and connected to an external modulator linked to the laser optical output and intensity modulates the laser output signal by the error signal in order to reduce or cancel the noise and distortion components in the signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.