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Lithium niobate electro-optical switch with ultra-large bandwidth

An electro-optical switch, ultra-large bandwidth technology, applied in the direction of light guide, optics, optical components, etc., can solve the problems of large dispersion, small wavelength of visible light band, difficult communication band, etc., and achieve the effect of ultra-high extinction

Pending Publication Date: 2020-11-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There may be two main reasons for this. One is that there are not many integrated photonic platforms suitable for the visible light band and capable of making high-performance optical switches; the other is that the wavelength of the visible light band is too small and the dispersion is too large. Optical switches with high extinction ratio are more difficult than communication bands

Method used

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  • Lithium niobate electro-optical switch with ultra-large bandwidth
  • Lithium niobate electro-optical switch with ultra-large bandwidth
  • Lithium niobate electro-optical switch with ultra-large bandwidth

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Embodiment Construction

[0032] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0033] figure 1is the top view of the structure of the equi-arm Mach-Zehnder interferometer. The equal-arm Mach-Zehnder interferometer includes a gradually changing input waveguide 1, a 3dB beam splitter, a separate curved waveguide, a phase shifter, a close curved waveguide, a 3dB beam combiner, and a gradually changing output waveguide 17 from input to output; the 3dB The beam splitter includes a beam-splitting intermediate waveguide 2, a beam-splitting upper waveguide 4, and a beam-splitting lower waveguide 3; wherein, the tapered input waveguide 1 is connected to the beam-splitting intermediate waveguide 2; the split curved waveguide includes an upper split curved waveguide 6, a lower split waveguide Separate the curved waveguide 5; wherein, one end of the upper separated curved waveguide 6 is connected to the beam-splitting upper waveguide 4, and...

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Abstract

The invention discloses a lithium niobate electro-optical switch with an ultra-large bandwidth. The lithium niobate electro-optical switch with the ultra-large bandwidth comprises a plurality of cascaded equal-arm Mach-Zehnder interferometers. The equal-arm Mach-Zehnder interferometer sequentially comprises a gradual change input waveguide, a 3dB beam splitter, a separated bent waveguide, a phaseshifter, a near bent waveguide, a 3dB beam combiner and a gradual change output waveguide from input to output. By setting the lengths of the phase shifters of the multiple equal-arm Mach-Zehnder interferometers in the cascade structure, the single-voltage controlled optical switch with the ultrahigh extinction ratio within the ultra-large bandwidth range can be achieved, and the optical switch can also be used as a compact integrated chopper or an ultra-large bandwidth modulator.

Description

technical field [0001] The invention relates to the field of integrated optoelectronic devices, in particular to a lithium niobate electro-optic switch with ultra-large bandwidth. Background technique [0002] Integrated photonics is a powerful platform. Compared with free-space optical systems, it can achieve many advantages such as low cost, small size, and replacement while improving the performance and stability of the optical system. In the past ten years, very remarkable achievements have been made in the development of low-loss integrated photonic platforms in the communication band, the most representative of which is silicon-based photonics. [0003] However, integrated photonic devices in the visible light band have received less attention. The visible light band involves many applications, including optical imaging, biosensing, biomedicine, optogenetics, and more. For example, alkali and alkaline earth metals, such as cesium, calcium, and sodium, are key elemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/03G02B6/125
CPCG02F1/0305G02F1/0316G02B6/125G02B2006/1204G02B2006/12159G02B2006/12085
Inventor 何赛灵黄强盛林宗兴陈楷旋
Owner ZHEJIANG UNIV
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