Patents by Inventor Drees Andriyanto

Drees Andriyanto 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).

  • Wavelength division multiplexing passive optical network system
    Patent number: 9806817
    Abstract: This disclosure describes a wavelength division multiplexing passive optical network system (100) comprising an optical line terminal (180) for controlling transmission of data that are carried by optical signals across the optical network system along an upstream or downstream path; a signal modulating loop circuit including a circulator (110) connected to the optical line terminal (180) for determining the transmission paths of the optical signals; a splitter (120) connected to the circulator (110) for splitting the optical signals into a first portion of optical signals and a second portion of optical signals according to a predetermined ratio; an amplifier (160) connected to the splitter (120) for amplifying the second portion of optical signals; and a modulator (170) connected in between the amplifier (160) and the splitter (120) for modulating the amplified second portion of optical signals to be transmitted to the circulator (110); a converter (140) connected to the splitter (130) for converting the fi
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: October 31, 2017
    Assignee: TELEKOM MALAYSIA BERHAD
    Inventors: Mohd. Shahril Bin Salleh, Ummi Supya Binti Ismail, Asmahanim Bte Ahmad, Drees Andriyanto, Muhammad Zamzuri bin, Zulhedry Abdul Manaf