A graphene Mach-Zehnder intensity modulator and its linearization method

An intensity modulator and ene Mach technology, applied in the field of optoelectronics, can solve problems such as poor linearity modulation characteristics, and achieve the effects of improving linearity, improving spurious-free dynamic range, and fast response characteristics

Active Publication Date: 2020-05-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

[0004] The purpose of the present invention is to: aim at the problem that the linearity modulation characteristics on the specific parameters such as improving its modulation bandwidth, modulation rate and reducing device power consumption etc. are relatively poor in the above-mentioned prior art research on graphene-based electro-optic modulators, propose A graphene Mach-Zehnder intensity modulator and its linearization method

Method used

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  • A graphene Mach-Zehnder intensity modulator and its linearization method
  • A graphene Mach-Zehnder intensity modulator and its linearization method
  • A graphene Mach-Zehnder intensity modulator and its linearization method

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Embodiment 1

[0034] A graphene Mach-Zehnder intensity modulator comprising a first modulation arm, a second modulation arm, a first positive electrode 3, a second positive electrode 4, a negative electrode 5 and a substrate layer 11, the first modulation arm 1 and the second modulation arm The two modulation arms 2 are graphene ridge waveguides 12, and the two modulation arms constitute a Mach-Zehnder interference structure; the graphene ridge waveguides 12 comprise first ridges 6, graphene layers 8, The second ridge 7; the first ridge 6 and the graphene layer 8 are isolated by the first isolation layer 9, and the second ridge 7 and the graphene layer 8 are isolated by the second isolation layer 10; the first positive electrode 3 and The second positive electrode 4 is located on the graphene layer 8 extending from the graphene ridge waveguide 12 , and the negative electrode 5 is located on the first isolation layer 9 extending from the graphene ridge waveguide 12 .

[0035] Such as Figur...

Embodiment 2

[0040] Such as Figure 1-5 Shown, a kind of graphene Mach-Zehnder intensity modulator and linearization method linearization method thereof comprise the following steps:

[0041] Step 1: Determining the thickness h of the first ridge 6 1 , width w 1 , the thickness h of the second ridge 7 2 , width w 2 , the thickness h of the first isolation layer 9 3 , width w 3 , the thickness h of the second isolation layer 10 4 , width w 4 , the length L of the first modulation arm 1 and the second modulation arm 2;

[0042] Step 2: Design a graphene Mach-Zehnder electro-optic modulator according to the parameters obtained in step 1, and fix the bias voltage of any modulation arm of the modulator to v 0 , this arm is denoted as modulating arm 1, and the other modulating arm is denoted as modulating arm 2. The light wave of constant power TE mode is incident from the input end of the modulator, and the bias voltage v of the modulation arm 2 is changed 1 , measure the output optic...

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Abstract

The invention discloses a graphene Mach-Zehnder intensity modulator and its linearization method, comprising a first modulation arm, a second modulation arm, a first positive electrode, a second positive electrode, a negative electrode and a substrate layer, the first The modulation arm and the second modulation arm are graphene ridge waveguides, and the two modulation arms constitute a Mach-Zehnder interference structure; the graphene ridge waveguide includes a first ridge, a graphene layer, a second Ridge; the first ridge is isolated from the graphene layer by the first isolation layer, and the second ridge is isolated from the graphene layer by the second isolation layer; the first positive electrode and the second positive electrode are respectively located in the first modulation arm and on the graphene layer extending from the graphene ridge waveguide of the second modulation arm, the negative electrode is located on the first isolation layer extending from the graphene ridge waveguide; the light wave of the TE mode of the input incident constant power changes the modulation arm The bias voltage is used to measure the output optical power of the modulator, and the curve of the transmitted optical power of the modulator as a function of the bias voltage is obtained.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, and in particular relates to a graphene Mach-Zehnder intensity modulator and a linearization method thereof. Background technique [0002] Mach-Zehnder electro-optic modulator, as the core device of optical fiber communication link, plays a pivotal role in microwave photonic system, optical signal transmission and processing system. By using the Mach-Zehnder interference structure, by changing the phase difference of the light field in the modulation arm of the modulator, the interference intensity of the light fields of the two arms is changed, so as to realize the purpose of loading the electrical signal onto the optical signal. However, the Mach-Zehnder EO modulator based on lithium niobate crystal has a sublinear sinusoidal transmission curve, so when an electrical signal is loaded on the light wave, nonlinear distortion will be introduced, which severely limits the performance of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/03
CPCG02F1/0305G02F1/0327
Inventor 张尚剑田楚铭邹新海张雅丽刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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