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A tunable optical differentiator based on silicon-based metamaterials

A metamaterial and differentiator technology, applied in optics, optical components, instruments, etc., can solve the problems of narrow bandwidth, untunable center wavelength of transmission spectrum, etc., to achieve good manufacturing tolerance, adjustable center wavelength, and reduce errors. Effect

Active Publication Date: 2020-11-17
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a tunable optical differentiator based on silicon-based metamaterials, aiming to solve the problem that the existing silicon-based optical differentiator has a narrow bandwidth and the center wavelength of the transmission spectrum cannot be tuned

Method used

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  • A tunable optical differentiator based on silicon-based metamaterials
  • A tunable optical differentiator based on silicon-based metamaterials
  • A tunable optical differentiator based on silicon-based metamaterials

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Embodiment 1

[0062] The height of the input waveguide, metamaterial waveguide, straight waveguide and output waveguide is 220nm, and the waveguide width W of the input and output waveguides is W=0.5μm, which is a typical value of a single-mode waveguide;

[0063] The metamaterial waveguide is composed of 15*20 square pixel blocks of four superconducting material waveguide units. The pixel blocks are symmetrical up and down with respect to the central axis of the tunable optical differentiator, and are arranged on the left and right sides of the straight waveguide. The overall pixel block is about the left and right sides of the straight waveguide. Symmetrical, forming a metamaterial waveguide with a symmetrical structure, which forms a strip-shaped metamaterial waveguide region as a whole;

[0064] The pixel blocks are closely arranged in the horizontal and vertical directions in each metamaterial waveguide unit, and the value of its side length Λ is: Λ=0.13 μm, which is a typical value of ...

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Abstract

The invention discloses a tunable optical differentiator based on a silicon-based metamaterial and belongs to the field of integrated photonic devices. The differentiator specifically comprises an input waveguide, a metamaterial waveguide, a straight waveguide and an output waveguide, wherein the metamaterial waveguide comprises four meta-material waveguide units which are uniformly distributed bytaking the transverse central axis and the longitudinal central axis of the straight waveguide as symmetric axes, the input waveguide and the output waveguide are symmetrically positioned on two sides of the metamaterial waveguide, the input waveguide transmits an incident light beam to the metamaterial waveguide, incident light beams are divided into n paths of light beams in the metamaterial waveguide, after states of pixel blocks in the metamaterial waveguide units are adjusted, the n paths of light beams interfere with one another to form a transmission spectrum which is large in bandwidth, linear in amplitude and capable of achieving phase jump, the straight waveguide is used for connecting the four metamaterial waveguide units, and the output waveguide is used for outputting a transmission spectrum. The differentiator is advantaged in thatthe THz-level differential bandwidth is realized, the optical signal processing bandwidth is expanded, and the central wavelength is adjustable.

Description

technical field [0001] The invention belongs to the field of integrated photonic devices, and more specifically relates to a tunable optical differentiator based on silicon-based metamaterials. Background technique [0002] Since the 21st century, due to the rapid development of computer technology, microelectronics technology and communication technology, people have gradually entered the information age, and the demand for information in contemporary society has reached an unprecedented height. With the explosive growth of people's demand for communication capacity, bandwidth and speed, the communication network based on electronic technology has almost reached the speed limit, and it has become more and more difficult to process signals in the electrical domain. All-optical computing uses photon technology to realize signal generation and processing, and the inherent characteristics of high bandwidth and high speed of photon signals are expected to overcome the speed bott...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/12G02B6/122G02B1/00
CPCG02B1/002G02B6/12G02B6/122G02B2006/12038
Inventor 张敏明刘仁福刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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