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Improved Mach-Zehnder electro-optic modulator on basis of graphene

An electro-optic modulator, an improved technology, applied in the field of optical instruments, can solve the problems of simultaneous modulation of the amplitude and phase of the guided wave optical field, and the inability of graphene electro-optic modulators to achieve the effect of improving the transmission rate and capacity

Inactive Publication Date: 2013-04-24
泰州巨纳新能源有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that existing Mach-Zehnder modulators and graphene electro-optic modulators cannot simultaneously modulate the amplitude and phase of the guided wave optical field, the present invention proposes an improved Mach-Zehnder electro-optic modulator based on graphene to increase more More signal points, further improving the rate and capacity of the optical communication system

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  • Improved Mach-Zehnder electro-optic modulator on basis of graphene

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Embodiment 1

[0010] Embodiment 1: According to figure 1 Shown, a kind of improved Mach-Zehnder electro-optic modulator based on graphene of the present invention, comprises Mach-Zehnder electro-optic modulator double-arm phase modulation and interference system (being upper modulation arm 3, lower modulation arm 4, upper modulation arm voltage V 1 (t), lower modulation arm voltage V 2 (t)) The arms of the Mach-Zehnder electro-optical modulator are respectively provided with a graphene film and a graphene film electrode, and an electric field is applied to the graphene film through the graphene film electrode, and the change of the electric field causes the graphene film to modulate the inside of the arm. The energy absorption of the light field changes, thereby modulating the amplitude and phase of the guided wave light in the modulation arm.

[0011] The graphene thin film of the present invention covers the double arms of the Mach-Zehnder electro-optic modulator and is connected with t...

Embodiment 2

[0034] Embodiment 2: According to figure 2 Shown:

[0035] 1. At a radius of (unit circle) provided on the circle signal point .

[0036] 2. At a radius of provided on concentric circles of signal point .

[0037] 3. At a radius of provided on concentric circles of signal point .

[0038] 4. The rest of the process is analogized until or a radius of on the concentric circles of signal point The Euclidean distance between so far, at this time value called .

[0039] According to the above method, the number of signal points that the improved Mach-Zehnder electro-optic modulator proposed by the present invention can provide under the same minimum Euclidean distance for

[0040]

[0041] Table 1 Comparison of the number of signal points between the improved and traditional Mach-Zehnder electro-optic modulators

[0042]

[0043] Under the same minimum Euclidean distance of the present invention, the improved Mach-Zehnder electro-optic mod...

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Abstract

The invention relates to an improved Mach-Zehnder electro-optic modulator on the basis of graphene. The improved Mach-Zehnder electro-optic modulator comprises a phase modulation and interference system of double arms of a Mach-Zehnder electro-optic modulator, and graphene thin films and graphene thin film electrodes are respectively arranged on the double arms of the electro-optic modulator. Electric fields are loaded on the graphene thin films by the graphene thin film electrodes, and the graphene thin films are changed in the aspect of absorption of energy of optical fields in the modulation arms by change of the electric fields, so that the amplitude and the phase of waveguide light in each modulation arm are modulated. In addition, optional P vibration amplitudes of waveguide photoelectric fields and optional Q phases can be selected by the improved Mach-Zehnder electro-optic modulator to realize R amplitude and phase modulation combinations, and the R meets the equation of R=PXQ. Besides, transmission rate and capacity of an existing optical fiber communication system can be further improved owing to the characteristic of quick response of the graphene, and large quantities of signal points can be provided under the condition of the identical minimum Euclidean distance.

Description

technical field [0001] The present invention relates to optical instruments, especially graphene-based improved Mach-Zehnder electro-optic modulators. Background technique [0002] The Mach-Zehnder electro-optic modulator is a commonly used interferometric external modulator. Its modulated output light is the result of mutual interference of the light fields of the two modulation arms. The signal points that can be obtained by the existing Mach-Zehnder electro-optic modulator can only be located on one ring in its signal space constellation diagram. Limited by this, with the increase of signal points, the Euclidean distance between signal points will decrease rapidly, and it is difficult to add more signal points, which limits the transmission rate and capacity of the optical fiber communication system. [0003] Graphene is a two-dimensional crystal composed of carbon atoms, and is the basic unit of allotropes of other carbon materials. Applying different voltages to grap...

Claims

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Application Information

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IPC IPC(8): G02F1/035
Inventor 梁铮丁荣义理林倪振华
Owner 泰州巨纳新能源有限公司