Patents by Inventor Rafael Puerta Ramirez

Rafael Puerta Ramirez has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Receiver and receiving method
    Patent number: 10554325
    Abstract: A transmitter transmitting a polarization multiplexed optical signal, includes: a light source; a generating unit configured to split a light of the light source into first and second polarized lights, optically modulate the first and second polarized lights based on an electric data signal, and multiplex the first polarized light optically-modulated and the second polarized light optically-modulated to generate the polarization multiplexed optical signal; and a coupling unit configured to couple a first reference light having a frequency different from a frequency of the light of the light source with the first polarized light and couple a second reference light having a frequency different from the frequency of the light of the light source with the second polarized light, wherein the first reference light and the second reference light have different frequencies.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: February 4, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Tomohiro Yamauchi, Takahito Tanimura, Takeshi Hoshida, Rafael Puerta Ramirez
  • TRANSMITTER, RECEIVER, AND TRANSMIT METHOD
    Publication number: 20190089479
    Abstract: A transmitter transmitting a polarization multiplexed optical signal, includes: a light source; a generating unit configured to split a light of the light source into first and second polarized lights, optically modulate the first and second polarized lights based on an electric data signal, and multiplex the first polarized light optically-modulated and the second polarized light optically-modulated to generate the polarization multiplexed optical signal; and a coupling unit configured to couple a first reference light having a frequency different from a frequency of the light of the light source with the first polarized light and couple a second reference light having a frequency different from the frequency of the light of the light source with the second polarized light, wherein the first reference light and the second reference light have different frequencies.
    Type: Application
    Filed: August 30, 2018
    Publication date: March 21, 2019
    Applicant: FUJITSU LIMITED
    Inventors: Tomohiro YAMAUCHI, Takahito Tanimura, Takeshi Hoshida, Rafael Puerta Ramirez