Surface core graphene electro-optical modulator based on femtosecond laser 3D direct writing technology

Abstract

The invention relates to an electro-optical modulator, and in particular relates to a surface core graphene electro-optical modulator based on a femtosecond laser 3D direct writing technology. The electro-optical modulator comprises an objective table, a moving track, a sliding block, an optical fiber clamp, a single-mode optical fiber, and a special optical fiber obtained through the femtosecond laser 3D direct writing technology. The specific structure of the special optical fiber comprises a coupling area, a modulation area, a middle fiber core, a surface core, a graphene layer and an electrode. A groove is etched on the objective table to form a moving track, the sliding block freely slides in a limited range of the moving track and is accurately fixed, the optical fiber clamp is placed on the sliding block to fix the single-mode optical fiber, graphene covers the special optical fiber obtained by the femtosecond laser 3D direct writing technology, and a metal electrode is evaporated above the graphene layer. The invention provides the electro-optical modulator which can effectively modulate optical carriers and is compatible with a contemporary single-mode optical fiber communication system, and the electro-optical modulator has an important scientific significance and a practical value for improving the working stability of the electro-optical modulator in the single-mode optical fiber communication system.

Description

technical field [0001] The invention belongs to the field of general optical fiber devices, in particular to the field of photon integration and modulation of optical carrier signals in optical fiber communication systems. Background technique [0002] Optical fiber communication technology has become an important pillar for the development of the information industry in the 21st century due to its advantages of large communication capacity, low loss and low cost. The sustainable development of contemporary optical fiber communication technology widely relies on various new types of optical fiber devices. Electro-optic modulators are the core of optical fiber communication networks and occupy an important position in the field of optical integration. Therefore, electro-optic modulation devices with large extinction ratio, high modulation rate and easy integration for optical fiber communication systems are crucial to the development of the future optical communication field....

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Problems solved by technology

[0005] The University of Southampton in the UK proposed an optical modulator suitable for single-mode fiber communication systems in 2016 [Zhang H, Healy N, Shen L, et al. Enhanced all-optical modulation in a graphene-coated fiber with low insertion loss[J].Scientific Reports,2016,6:23512.], the side of the optical fiber is polished to achieve a strong interaction between graphene and the optical fiber. The storage method of the polished optical fiber is also extremely complicated

In order to ensure the integrity of the optical fiber structure, the team of Chen Ke of Peking University took another approach and proposed a graphene electro-optic modulator based on photonic crystal fiber [Chen K, Zhou X, Cheng X, et al. Graphene photonic crystal fiber with strong and tunable light –matter interaction[J].Nature Photonics,2019,13(11):1-6.], although the structure has certain adaptability to the communication system based on single-mode fiber, the length of the structure is not less than 50cm and the loss is extremely high

[0006] In summary, the efficient combination of graphene materials and single-mode optical fibers has important scientific significance and practical value for the further development of contemporary optical fiber communication systems, but the development of this technology is difficult

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