Fiber coupling method for ppln waveguide device, waveguide device and single photon detector
A technology of optical fiber coupling and waveguide devices, which is applied in the coupling of optical waveguides, optical waveguide light guides, instruments, etc., can solve the problems of imperfect mode field matching and reduce the frequency conversion efficiency of PPLN waveguides, etc.
Active Publication Date: 2021-12-31
JINAN INST OF QUANTUM TECH +1
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[0007] By comparison figure 2 and Figure 4 From the mode field distribution shown, it can be found that the mode field matching between the standard single-mode fiber and the PPLN waveguide is not perfect, and this direct alignment coupling will bring a loss of about 1dB, thereby greatly reducing the frequency conversion of the PPLN waveguide efficiency
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[0030] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided by way of illustration in order to fully convey the spirit of the present invention to those skilled in the art to which the present invention pertains. Therefore, the present invention is not limited to the embodiments disclosed herein.
[0031] Compared with the standard single-mode fiber, the micro-nano fiber has a fiber diameter on the order of micro-nano and a large refractive index difference is formed between the core and the cladding due to the use of air as the fiber cladding, which leads to the micro-nano fiber It has a strong confinement ability for light; in addition, the micro-nano fiber also has the advantages of a wide range of material sources and high mechanical strength. Due to the characteristics of small size, low light propagation loss, softness and flexibility, micro-nano fibers...
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Abstract
The present invention proposes an efficient fiber coupling method for PPLN waveguide devices based on micro-nano optical fiber, in which the best matching between the micro-nano optical fiber mode field and the PPLN waveguide mode field is realized to the greatest extent by changing the diameter of the optical fiber, achieving micro-nano The purpose of efficient coupling between optical fiber and PPLN waveguide, and the best matching result can be obtained in advance through numerical simulation, so that the matching method can be implemented efficiently and at low cost, greatly reducing the design and manufacturing costs of PPLN waveguide devices.
Description
technical field [0001] The invention relates to the field of optical devices, in particular to an efficient optical fiber coupling method for periodically poled lithium niobate (PPLN) waveguide devices, a waveguide device prepared by the method, and a single photon detector including the waveguide device . Background technique [0002] Periodically polarized lithium niobate (PPLN) waveguide is one of the core key components of quantum communication. Using PPLN waveguide to realize the frequency conversion from photons in the communication band to the visible light band, and then using commercial silicon detectors for detection can solve the problem of single photons in the communication band. The problem of low detection efficiency. The PPLN waveguide based on reverse proton exchange has the advantages of low transmission and coupling loss and high conversion efficiency due to its moderate refractive index change, controllable spot mode, and easy realization of long chips. ...
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IPC IPC(8): G02B6/26G02B6/12G01J11/00
CPCG02B6/26G02B6/12G01J11/00G02B2006/1204G02B2006/12147
Inventor 姚权姚妮郑名扬谢秀平方伟张强
Owner JINAN INST OF QUANTUM TECH