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High sensitivity photonic crystal fiber refractive index sensor and method for preparing same

A technology of photonic crystal fiber and refractive index sensor

Active Publication Date: 2012-10-24
NANJING UNIVERSTIY SUZHOU HIGH TECH INST
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Problems solved by technology

However, due to the large size of the photonic crystal and the small evanescent field, its refractive index sensitivity is very low. Generally, the refractive index sensitivity of the non-polarization interference device based on the photonic crystal fiber is ≈223nm / RIU (the length of the photonic crystal fiber is 2cm), the sensitivity to the refractive index is not high, which also limits the application of photonic crystal fibers to a certain extent

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  • High sensitivity photonic crystal fiber refractive index sensor and method for preparing same
  • High sensitivity photonic crystal fiber refractive index sensor and method for preparing same
  • High sensitivity photonic crystal fiber refractive index sensor and method for preparing same

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that the features of the present invention can be clearly demonstrated.

[0024] figure 1 It is the light path diagram of the present invention, wherein the ASE light source emits light in the C+L band (1525-1610nm). In the experiment, one end of the LMA-8 photonic crystal fiber was cut flat with a fiber cleaver, and then it was fused with a standard single-mode fiber. Then cut the other end of the fused photonic crystal fiber flat, and then weld it with the standard single-mode fiber. During the welding, the welding time should be reasonably controlled, and the parameters such as discharge intensity can ensure a certain contrast of the spectrum while the loss is small. Then put the optical fiber on the electric translation stage, use the hydrogen gas flame to heat the middle of the photonic crystal fiber, and move the electric translation st...

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Abstract

The invention discloses a high sensitivity photonic crystal fiber refractive index sensor and a method for preparing the same. The sensor comprises single-mode fibers at the two ends, and a small segment of micro-tensile photonic crystal fiber which is connected with the single-mode fibers and disposed at the middle part of the sensor. The length change of the sensor after being stretched is smaller than 0.5 cm. The micro-tensile photonic crystal fiber has a solid core and an air cladding, with a length of 10-30 mm. The preparing method is that through micro stretching the photonic crystal fiber, the fiber diameter is reduced, the light field in the air is increased and the interaction between the light field and the environment is increased. The preparing method of the sensor is simple and feasible, and the sensor has a broad application prospect in fields such as optical fiber sensing. The photonic crystal fiber with a waist diameter of 30 micrometer can obtain a refractive index sensitivity of 1629.03nm / RIU at present.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to the research and preparation of micro-nano optical fiber sensors. More specifically, a high-sensitivity photonic crystal fiber interference type refractive index sensor is prepared by fusing with a single-mode fiber and then stretching the photonic crystal fiber. Background technique [0002] Optical fiber interferometric sensors have important applications in many fields, such as biosensing, food safety, seawater salinity measurement, etc. In recent years, since the propagation characteristics of photonic crystal fibers are different from those of traditional fibers, interferometric sensors based on photonic crystal fibers have attracted more and more attention. One of the types is to splice ordinary single-mode fibers by fusion, and use the collapse of the cavity in the photonic crystal fiber at the fusion point to excite high-order modes and interfere with the fundame...

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Application Information

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IPC IPC(8): G01N21/45
Inventor 徐飞李程邱孙杰陈烨陆延青胡伟
Owner NANJING UNIVERSTIY SUZHOU HIGH TECH INST
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