US 12,085,831 B2
Linearized modulator
Adam Scofield, Los Angeles, CA (US); Thomas Pierre Schrans, Temple City, CA (US); and Aaron John Zilkie, Pasadena, CA (US)
Assigned to Rockley Photonics Limited, Altrincham (GB)
Appl. No. 17/753,241
Filed by ROCKLEY PHOTONICS LIMITED, Altrincham (GB)
PCT Filed Aug. 25, 2020, PCT No. PCT/EP2020/073759
§ 371(c)(1), (2) Date Feb. 24, 2022,
PCT Pub. No. WO2021/037856, PCT Pub. Date Mar. 4, 2021.
Prior Publication US 2022/0299836 A1, Sep. 22, 2022
Int. Cl. G02F 1/225 (2006.01); G02F 1/21 (2006.01)
CPC G02F 1/2257 (2013.01) [G02F 1/212 (2021.01)] 20 Claims
OG exemplary drawing
 
1. An electro-optical modulator, comprising:
an input waveguide, configured to guide light into a modulation region of the electro-optical modulator;
a plurality of sub-modulators, within the modulation region, each sub-modulator having a transfer function between an applied voltage and an optical phase shift; and
an output waveguide, configured to guide light out of the modulation region,
wherein a combination of the transfer functions of each sub-modulator is such that a total transfer function between an applied voltage and an optical phase shift of the modulation region is substantially linear over a range of operating voltages, and
wherein a first transfer function, of a first sub-modulator of the plurality of sub-modulators, is different from a second transfer function, of a second sub-modulator of the plurality of sub-modulators.