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Optical n-level quadrature amplitude modulation (NQAM) generation based on phase modulator

A modulator and phase technology, applied in optics, nonlinear optics, instruments, etc., can solve problems such as phase modulation and control are not simple and difficult to solve

Active Publication Date: 2019-09-27
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the phase change is quadratic with the heating voltage, the phase modulation and control is not simple and mathematically unsolvable

Method used

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  • Optical n-level quadrature amplitude modulation (NQAM) generation based on phase modulator
  • Optical n-level quadrature amplitude modulation (NQAM) generation based on phase modulator
  • Optical n-level quadrature amplitude modulation (NQAM) generation based on phase modulator

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Embodiment Construction

[0028] It should be understood at the outset that, although an illustrative implementation of one or more embodiments is provided below, the disclosed systems and / or methods may be implemented using any number of techniques, whether currently known or in existence. The invention should in no way be limited to the illustrative implementations, drawings, and techniques illustrated below, including the exemplary designs and implementations illustrated and described herein, but rather be within the scope of the appended claims and their equivalents Modified within the full range of .

[0029] In the embodiment of the present invention, first consider image 3 SiP-based Mach-Zehnder modulator3 shown (some implementation details omitted for brevity). Coherent light 300 is generated from a light source 302, split into two silicon waveguides. The upper arm phase shifter 312 and the lower arm phase shifter 322 in the silicon waveguide have been doped to form a pn junction across the w...

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Abstract

A technique for tuning a silicon photonics (SiP) based nested (parent / child) Mach-Zehnder modulator (MZM). The technique includes a sequence of applying dither tones on individual arms of the child MZMs (4a, 4b), observing changes in the output of the MZM, and adjusting the MZM until reaching the null points for the child MZMs (4a, 4b) and the quad point for the parent MZM (4c).

Description

[0001] Related Applications Cross Application [0002] This application requires the title of the invention submitted on February 13, 2017 to be "Optical N-level quadrature amplitude modulation (NQAM) generation based on phase modulator" 15 / 430,714, the content of which is incorporated herein by reference. Background technique [0003] When light passes through a transparent material, its speed is reduced proportional to the refractive index of that material. The refractive index of some materials changes in the presence of an electric field and / or heat. In a typical conventional electro-optic modulator, light passes through a lithium niobate (LiNbO 3 ) made of waveguide. By selectively applying an electric field to the waveguide, light passing through it is slowed down, changing the phase of the light exiting the waveguide. By varying the electric field according to the digital data signal, the light exiting the waveguide becomes a modulated carrier wave carrying the digi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/225G02F1/01G02F1/21H04B10/54
CPCG02F1/0147G02F1/2255G02F2201/58G02F1/212H04B10/5053H04B10/50575
Inventor 沈金西石忠单娜
Owner HUAWEI TECH CO LTD