Apparatus and method for adjusting the control signal of an electro-optical modulator
US6587249B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 2001 |
| Grant date | Jul 1, 2003 |
| Priority date | — |
| Expiry date | Nov 28, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/0123
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a method of positioning an electrical control signal (S1, S1bis) for an electro-optical modulator (5) relative to the characteristic (VA, VB) of the modulator (5), in which method a disturbing signal (S2, S2bis) is superposed on the control signal (S1, S1bis) and the position of the control signal (S1, S1bis) is adjusted as a function of the value of a component in the output signal of the modulator (5) corresponding to the applied disturbance (S2, S2bis), in which method the disturbance (S2, S2bis) is superposed on the control signal (S1, S1bis) when the control signal takes a value (VA) that ought to correspond to a minimum slope point (A) of the characteristic, and the positioning of the control signal (S1, S1bis) is adjusted in such a manner as to minimize the amplitude of the disturbance as output due to said disturbance of the control signal (S1, S1bis), the method being characterized in that the characteristic of the modulator (5) includes a second minimum slope point (B) corresponding to a second control level (VB), and in that a second disturbance (S2) is applied to the control signal (S1, S1bis) when it is at said second control level (VB), and in t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.