Patent · US Active

Polarization-multiplexing optical transmitter polarization-multiplexing optical receiver, polarization-multiplexing optical transceiving system, and controlling method thereof

US8244138B2 · kind B2 · utility

4Cited by
8References
12Claims
0Family size

Assignee

Inventors

Key dates

Filing dateFeb 28, 2008
Grant dateAug 14, 2012
Priority date
Expiry dateAug 15, 2030

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04B10/532
  • WIPO fieldTelecommunications
  • WIPO sectorElectrical engineering

Abstract

By using low-frequency signals, an optical transmitting unit modulates one of a wavelength, a transmission timing, and an intensity of light as a carrier wave. A polarization multiplexer synthesizes the output light signals, modulated by the optical transmitting unit, in polarization states orthogonal to each other and generates polarization-multiplexing signals. A polarization splitter splits by extracting two orthogonal polarization components from the polarization-multiplexing signals. The polarization states of the polarization-multiplexing signals are controlled by a polarization controller in an optical receiving unit. A band-pass filter extracts components transmitting through passbands from output signals of the optical receiving unit and outputs an intensity of the components. Based on the intensity output from the filter, a controlling circuit generates feedback control signals for maximizing a ratio of the components of the low-frequency signals and by using the feedback control signals, the polarization controller controls the polarization states of the optical multiplexing signals.

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