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Method and system for silicon photonics wavelength division multiplexing transceivers

  • US 9,912,408 B2
  • Filed: 10/28/2015
  • Issued: 03/06/2018
  • Est. Priority Date: 10/28/2014
  • Status: Active Grant
First Claim
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1. A method for optical communication, the method comprising:

  • in a transceiver integrated in a silicon photonics chip;

    generating a first modulated output optical signal at a first wavelength utilizing a first electrical signal;

    generating a second modulated output optical signal at a second wavelength utilizing a second electrical signal;

    communicating the first and second modulated output optical signals into an optical fiber coupled to the chip utilizing a multiplexing grating coupler in the chip, wherein the multiplexing grating coupler comprises;

    a pair of intersecting gratings with scatterers situated at intersections of the intersecting gratings;

    an expanding region between the pair of intersecting gratings and an optical waveguide; and

    a slit comprising a reduced thickness of silicon between the pair of intersecting gratings and the expanding region;

    splitting a received input optical signal into a modulated input optical signal at the first wavelength and a modulated input optical signal at the second wavelength utilizing a demultiplexing grating coupler in the chip;

    converting the modulated input optical signal at the first wavelength to a first electrical input signal utilizing a first photodetector in the chip; and

    converting the modulated input optical signal at the second wavelength to a second electrical input signal utilizing a second photodetector in the chip.

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