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:
Jan. 07, 2025
Filed:
Mar. 08, 2022
Cisco Technology, Inc., San Jose, CA (US);
Kadaba Lakshmikumar, Hillsborough, NJ (US);
Romesh Kumar Nandwana, Breinigsville, PA (US);
Alexander C. Kurylak, Nazareth, PA (US);
CISCO TECHNOLOGY, INC., San Jose, CA (US);
Abstract
Techniques for implementing a differential differencing TIA for coherent applications are disclosed. A method includes receiving first and second optical signals from a 90 degree optical hybrid that receives a coherent optical signal, wherein the first and second optical signals each include one pair of sum and difference signals output by the 90 degree optical hybrid, generating, based on the first optical signal and from a first photo diode, a first differential signal, generating, based on the second optical signal and from a second photo diode, a second differential signal, differentially transconducting the first and second differential signals to produce first and second transconducted signals, performing a differencing operation on the first and second differential transconducted signals to produce a combined differential-differencing transconducted signal that is representative of the first optical signal and the second optical signal, and outputting the combined differential transconducted signal as a differential output.