Patent ID: 11874538
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. An optical signal modulator for modulating an optical carrier signal, comprising:
a first ring modulator configured to control an amount of light passing therethrough based upon a first differential signal generated by a differential signal generator and applied to the first ring modulator to generate a first output, wherein the first ring modulator comprises:
a first contact region;
a first buried region having a first doping concentration;
a second buried region having a second doping concentration less than the first doping concentration, where the first buried region is between the first contact region and the second buried region; and
a first ring region, wherein the second buried region is between the first buried region and the second buried region;

a second ring modulator configured to control an amount of the light passing therethrough based upon a second differential signal generated by the differential signal generator and applied to the second ring modulator to generate a second output; and
an optical signal combiner optically coupled to the first ring modulator and to the second ring modulator and configured to combine the first output and the second output to generate a combined output.