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:
Jun. 29, 2021
Filed:
Aug. 09, 2019
Applicant:
Neophotonics Corporation, San Jose, CA (US);
Inventor:
Jianying Zhou, Acton, MA (US);
Assignee:
NeoPhotonics Corporation, San Jose, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
G02F 1/225 (2006.01); G02F 1/01 (2006.01); G02F 1/21 (2006.01);
U.S. Cl.
CPC ...
G02F 1/225 (2013.01); G02F 1/0121 (2013.01); G02F 1/2255 (2013.01); G02F 1/212 (2021.01);
Abstract
Optical modulators with semiconductor based optical waveguides interacting with an RF waveguide in a traveling wave structure. The semiconductor optical waveguide generally comprise a p-n junction along the waveguide. To reduce the phase walk-off between the optical signal and the RF signal, the traveling wave structure can comprise one or more compensation sections where the phase walk-off is reversed. The compensation sections can comprise a change in dopant concentrations, extra length for the optical waveguide and/or extra length for the RF waveguide. Corresponding methods are described.