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A single-mode transmission method based on the mode cut-off characteristic in the photonic bandgap

A transmission method and photonic bandgap technology, applied in optics, light guides, cladding fibers, etc., can solve problems such as the inability to meet the application of fiber mode, achieve the effect of flexible selection of working band and bandwidth, and improved applicability

Active Publication Date: 2020-03-06
BEIHANG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that there are many high-order modes in the existing hollow-core photonic bandgap optical fiber, which cannot satisfy the application occasions with high requirements on the characteristics of the optical fiber mode, and propose a mode cut-off characteristic based on the photonic bandgap single-mode transmission method

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  • A single-mode transmission method based on the mode cut-off characteristic in the photonic bandgap
  • A single-mode transmission method based on the mode cut-off characteristic in the photonic bandgap
  • A single-mode transmission method based on the mode cut-off characteristic in the photonic bandgap

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Embodiment

[0045] Embodiment: The working wavelength of the fiber optic gyroscope is generally 1530nm, and the bandwidth is above 30nm. Therefore, it is necessary to adjust the fiber structure to achieve single-mode transmission at least within the 1530±15nm band. According to the single-mode transmission method based on the mode cut-off characteristic of the present invention, on the basis of the existing optical fiber, keeping other parameters unchanged, the cladding air hole is relatively chamfered d C / d is increased to 0.63, and the structural parameters of the optical fiber are shown in Table 1. At this time, the mode characteristic curves of the fundamental mode and the second-order mode of the optical fiber and the single-mode transmission area are as follows: Figure 12 As shown, quasi-single-mode transmission can be realized in the 1499-1545nm band, which meets the application requirements of fiber optic gyroscopes.

[0046] Table 1 is for adjusting the relative chamfer d C S...

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Abstract

The invention discloses a single-mode transmission method based on mode cutoff characteristics in a photonic band gap and belongs to the technical field of optical fiber transmission sensing. The single-mode transmission method is characterized by determining single mode cut-off waveband according to a relation curve between effective refractive indexes and wave length of each mode in an optical fiber; and carrying out structural parameter optimization to increase bandwidth of a single-mode transmission band, thereby realizing single mode transmission under different working wavelengths. According to the provided method, selection of single-mode transmission working waveband and bandwidth is flexible; through structure optimization, single-mode transmission applicability can be improved; and the method is suitable for short-distance application occasions having high requirements for modes.

Description

technical field [0001] The invention relates to a method for realizing single-mode transmission in a hollow-core photonic bandgap optical fiber, and belongs to the technical field of optical fiber transmission and sensing. Background technique [0002] Hollow-core photonic bandgap fiber is a new type of optical fiber based on the photonic bandgap effect. A two-dimensional photonic crystal material that confines light waves is formed by periodically arranging silica and air holes, and then introducing defects into the periodic material. Make light waves propagate in the defect, which is a microstructured optical fiber based on a two-dimensional periodic arrangement of a low-refractive index material (air) in a high-refractive index background material (silicon dioxide). The uniqueness of this principle and structure makes photonic bandgap fibers have many characteristics different from traditional fibers, such as low sensitivity to environmental factors such as temperature, e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/032
CPCG02B6/02323G02B6/032
Inventor 徐小斌李金恒高福宇张智昊宋凝芳张春熹
Owner BEIHANG UNIV