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A High Birefringence Dispersion Tunable Photonic Crystal Fiber

A photonic crystal fiber, high birefringence technology, applied in the direction of cladding fiber, optical waveguide light guide, light guide, etc., can solve the problem of not satisfying optics, etc., and achieve the effect of low limit loss and high birefringence

Active Publication Date: 2017-08-01
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2009, Chosun University in South Korea formed a new type of photonic crystal fiber by inserting a new air hole between every other air hole in two adjacent rows of traditional rectangular grid photonic crystal fiber (Kim S. Opt Lett 2009; 17:7952 ), theoretical research shows that the birefringence of the photonic crystal fiber is an order of magnitude higher than that of the traditional rectangular grid photonic crystal fiber, and a large negative dispersion of -275ps / km∙nm can be obtained by adjusting the structural parameters, but it still cannot meet the further needs of optics

Method used

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  • A High Birefringence Dispersion Tunable Photonic Crystal Fiber
  • A High Birefringence Dispersion Tunable Photonic Crystal Fiber
  • A High Birefringence Dispersion Tunable Photonic Crystal Fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: The base material 1 and the fiber core 2 of the optical fiber are both pure silica.

[0031] Such as Figure 2a , 2b As shown, the birefringence and loss-limited characteristics of the present invention can be seen. As a special optical fiber, birefringent photonic crystal fiber has already been used beyond the scope of optical communication. It also plays an important role in the fields of fiber laser, optical fiber sensing, and integrated optical information processing. At the same time, the low limit loss is the critical factor in device performance. When Λ=1 μm, d / Λ=0.8, the birefringence of the present invention and polarization-dependent confining loss vary with wavelength as follows respectively Figure 2a with Figure 2b shown. Depend on Figure 2a It can be seen that the birefringence increases with the increase of the wavelength, and in the communication band (1.26μm~1.675μm), the birefringence reaches 10 -2 above the order of magnitude; b...

Embodiment 2

[0033] Example 2: The base material 1 and the core 2 of the optical fiber are both tellurite glass, and its composition is 90mol% Te2O, 10mol% Al2O3 (Takabe H. Am Ceram Soc 1994; 77:2455).

[0034] Such as Figure 4a , 4b As shown, the birefringence and dispersion characteristics of the present invention can be seen. Tellurite glass has become an important material for the study of mid- and far-infrared optical fiber devices due to its unique optical properties and physical and chemical properties. When Λ=2μm, d / Λ=0.8, the birefringence and dispersion of the present invention vary with wavelength as follows Figure 4a with Figure 4b shown. Depend on Figure 4a It can be seen that birefringence increases with wavelength. Typically, at the wavelength λ=2.94μm, the birefringence can reach 1.53×10 -2 , it can be seen that the present invention will play an important role in mid-infrared laser devices. Depend on Figure 4b It can be seen that with the increase of the wave...

Embodiment 3

[0035] Embodiment 3: The base material 1 and the fiber core 2 of the optical fiber are both PMMA (polymethyl methacrylate).

[0036] Such as Figure 5a , 5b As shown, the birefringence and dispersion characteristics of the present invention can be seen. Polymer photonic crystal fibers have much higher transmittance in the ultraviolet and visible light regions than traditional silica photonic crystal fibers, and are easy to prepare and low in cost. At present, a variety of polymer photonic crystal fiber designs and process studies have been reported one after another. When Λ=1μm, d / Λ=0.8, the birefringence and dispersion of the present invention vary with wavelength as follows Figure 5a with Figure 5b shown. Depend on Figure 5a It can be seen that the birefringence increases with the increase of the wavelength, and when the wavelength increases to 0.478 μm, the birefringence reaches 10 -3 order of magnitude (currently the birefringence value of polymer high birefringen...

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Abstract

The invention discloses a high double-refraction chromatic dispersion adjustable pohotonic crystal fiber. The high double-refraction chromatic dispersion adjustable pohotonic crystal fiber comprises a substrate material, a fiber core, rectangular arranged medium holes and regular triangle lattice arranged medium holes, wherein the fiber core, the rectangular arranged medium holes and the regular triangle lattice arranged medium holes are distributed from inside to outside, a center that defines an end face of the optical fiber serves as a circle center, an X axis is parallel to long side directions of a rectangle that the rectangular arranged medium holes correspond to, a Y axis is parallel to short side directions of the rectangle that the rectangular arranged medium holes correspond to, the X axis and the Y axis pass through the circle center, the fiber core, the rectangular arranged medium holes and the regular triangle lattice arranged medium holes are symmetrical along the circle center respectively, five medium holes are designed in the long sides of the rectangle, three medium holes are designed in the short sides of the rectangle, and positions which are adjacent to second and fourth medium holes of the long sides of the rectangle in the Y axis direction are free of medium holes in terms of the regular triangle lattice arranged medium holes. The high double-refraction chromatic dispersion adjustable pohotonic crystal fiber has the advantages of high double refractions and low confinement loss, and hole intervals and medium hole sizes can be adjusted so that adjustment of large negative dispersion and zero dispersion wave lengths can be achieved.

Description

technical field [0001] The invention relates to the field of photonic crystal fibers, in particular to a photonic crystal fiber with high birefringence, low limit loss and adjustable dispersion. Background technique [0002] Traditional photonic crystal fibers usually consist of a silica defect core and a cladding with a series of periodic air holes. The effective refractive index of the cladding can be regarded as the average value of the air hole and the background material of silica. Since the refractive index of the core is greater than that of the cladding, the optical signal can be transmitted in the defective core by total internal reflection. [0003] In fiber optics, high birefringence can effectively reduce polarization coupling to preserve the linear polarization state of the optical signal. Conventional polarization-maintaining fibers generate birefringence by introducing stress or geometric asymmetry in the fiber, usually with small birefringence (approximately...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02
CPCG02B6/02328
Inventor 韦玮全昭唐子汇邹辉马勇
Owner NANJING UNIV OF POSTS & TELECOMM
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