Device for optical frequency translation and a modulator in which said device is employed
First Claim
Patent Images
1. A device for optical translation of optical frequency, comprising:
- a substrate of electrooptical material;
two optical transmission waveguides integrated on said substrate, said two optical transmission waveguides being in substantially parallel relationship over a length L1 and spaced from each other at a distance d1 ;
at least two electrodes extending along said waveguides over the distance L1, forming a microwave propagation line;
a characteristic impedance which closes said microwave propagation line;
a microwave signal having a frequency F supplied to said microwave propagation line;
said microwave propagation line converting the symmetric mode of a transmitted optical wave to the antisymmetric mode with a frequency translation in the antisymmetric mode of F; and
means for converting the antisymmetric mode to the symmetric mode to produce ann optical signal which is frequency-shifted by the frequency F.
1 Assignment
0 Petitions
Accused Products
Abstract
In a device for shifting the frequency of an optical wave, two optical waveguides coupled by an optical wave which propagates in the symmetric mode are excited and subjected to the action of an electromagnetic traveling wave having the effect of shifting the frequency of the optical wave which undergoes a transition from the symmetric mode to the antisymmetric mode. A transfer device supplied with a direct-current voltage VO serves to re-convert the antisymmetric mode to the symmetric mode in order to add the two light signals and to obtain a single output signal translated by the frequency F. This permits the construction of BLU optical modulators.
24 Citations
9 Claims
-
1. A device for optical translation of optical frequency, comprising:
-
a substrate of electrooptical material; two optical transmission waveguides integrated on said substrate, said two optical transmission waveguides being in substantially parallel relationship over a length L1 and spaced from each other at a distance d1 ; at least two electrodes extending along said waveguides over the distance L1, forming a microwave propagation line; a characteristic impedance which closes said microwave propagation line; a microwave signal having a frequency F supplied to said microwave propagation line; said microwave propagation line converting the symmetric mode of a transmitted optical wave to the antisymmetric mode with a frequency translation in the antisymmetric mode of F; and means for converting the antisymmetric mode to the symmetric mode to produce ann optical signal which is frequency-shifted by the frequency F. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification