The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 24, 2021
Filed:
Nov. 19, 2018
Rockley Photonics Limited, London, GB;
Guomin Yu, Glendora, CA (US);
Amit Singh Nagra, Altadena, CA (US);
Damiana Lerose, Pasadena, CA (US);
Hooman Abediasl, Pasadena, CA (US);
Pradeep Srinivasan, Fremont, CA (US);
Joyce Kai See Poon, Toronto, CA;
Zheng Yong, Toronto, CA;
Haydn Frederick Jones, Reading, GB;
Rockley Photonics Limited, Oxford, GB;
Abstract
An optoelectronic device. The optoelectronic device operable to provide a PAM-N modulated output, the device comprising: M optical modulators, M being an integer greater than 1, the M optical modulators being arranged in a cascade, the device being configured to operate in N distinct transmittance states, as a PAM-N modulator, wherein, in each transmittance state of the N distinct transmittance states, each of the M optical modulators has applied to it a respective control voltage equal to one of: a first voltage or a second voltage. One or more of the modulators may include a substrate; a crystalline cladding layer, on top of the substrate; and an optically active region, above the crystalline cladding layer. The crystalline cladding layer may have a refractive index which is less than a refractive index of the optically active region.