Patent · US Expired

Optical phase modulator

US6947193B1 · kind B1 · utility

1Cited by

3References

15Claims

0Family size

Assignee

DEUTSCHE TELEKOM AG · DE

Inventors

Wolfgang Dultz · Frankfurt am Main, DE
Heidrun Schmitzer · Grünhain, DE
Leonid A. Beresnev · Dayton, US
Gisela Dultz · Frankfurt am Main, DE

Key dates

Filing date	Nov 20, 2000
Grant date	Sep 20, 2005
Priority date	—
Expiry date	Apr 15, 2021

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/0136
WIPO fieldOptics
WIPO sectorInstruments

Abstract

To provide a phase modulator for introducing a topological phase, which is designed to produce any desired phase shift between zero and 360°, the phase modulator has means, at least one double-refractive, electrooptical delay element having a rotatable indicatrix, which is/are used to direct the polarization of the light, during transmission through the modulator, over at the light one closed path on the Poincaré sphere, the indicatrix rotating in accordance with the predefined phase shift, and the total encircled surface on Poincaré sphere being equal in terms of absolute value to φ.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.