Patent · US Active

Optical modulator with automatic bias correction

US9638940B2 · kind B2 · utility

1Cited by
10References
15Claims
0Family size

Assignee

Inventor

Key dates

Filing dateMay 24, 2016
Grant dateMay 2, 2017
Priority date—
Expiry dateMay 24, 2036

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04B10/5053
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

An optical modulator uses an optoelectronic phase comparator configured to provide, in the form of an electrical signal, a measure of a phase difference between two optical waves. The phase comparator includes an optical directional coupler having two coupled channels respectively defining two optical inputs for receiving the two optical waves to be compared. Two photodiodes are configured to respectively receive the optical output powers of the two channels of the directional coupler. An electrical circuit is configured to supply, as a measure of the optical phase shift, an electrical signal proportional to the difference between the electrical signals produced by the two photodiodes.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.