Photonic crystal fiber with novel dispersion properties

doi:10.1007/s12200-009-0022-z

Front Optoelec Chin

2009, Vol. 2

Issue (2) : 170-177 https://doi.org/10.1007/s12200-009-0022-z

RESEARCH ARTICLE

Photonic crystal fiber with novel dispersion properties

Shuqin LOU¹(

), Shujie LOU², Tieying GUO¹, Liwen WANG¹, Weiguo CHEN¹, Honglei LI¹, Shuisheng JIAN¹

1. Key Lab of All Optical Network and Advanced Telecommunication Network of EMC, Beijing Jiaotong University, Beijing 100044, China; 2. Shandong Weifang Huaguang Precision Machinery Co., Weifang 261031, China

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Abstract

Our recent research on designing microstructured fiber with novel dispersion properties is reported in this paper. Two kinds of photonic crystal fibers (PCFs) are introduced first. One is the highly nonlinear PCF with broadband nearly zero flatten dispersion. With introducing the germanium-doped (Ge-doped) core into highly nonlinear PCF and optimizing the diameters of the first two inner rings of air holes, a new structure of highly nonlinear PCF was designed with the nonlinear coefficient up to 47 W^-1·km^-1 at the wavelength 1.55 μm and nearly zero flattened dispersion of ±0.5 ps/(km·nm) in telecommunication window (1460-1625 nm). Another is the highly negative PCF with a ring of fluorin-doped (F-doped) rods to form its outer ring core while pure silica rods to form its inner core. The peak dispersion -1064 ps/(km·nm) in 8 nm full width at half maximum (FWHM) wavelength range and -365 ps/(km·nm) in 20 nm (FWHM) wavelength range can be reached by adjusting the structure parameters. Then, our recent research on the fabrication of PCFs is reported. Effects of draw parameters such as drawing temperature, feed speed, and furnace temperature on the geometry of the final photonic crystal fiber are investigated.

Keywords photonic crystal fiber (PCF) nearly zero flatten dispersion high nonlinear high negative dispersion fabrication technique

Corresponding Author(s): LOU Shuqin,Email:shqlou@bjtu.edu.cn

Issue Date: 05 June 2009

Cite this article:

Shuqin LOU,Shujie LOU,Tieying GUO, et al. Photonic crystal fiber with novel dispersion properties[J]. Front Optoelec Chin, 2009, 2(2): 170-177.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-009-0022-z
https://academic.hep.com.cn/foe/EN/Y2009/V2/I2/170

Fig.1 Cross section of seven-ring triangular PCF considered

Fig.2 Dispersion of PCF with /L=/L=0.9 and L=1 mm at different /L

Fig.3 Dispersion of PCF with /L= 0.42, /L=0.9, and L=1 mm at different /L

Fig.4 Dispersion curves with various Ge doping concentration from 10 mol% to 14 mol% for highly nonlinear microstructured fiber with Λ =1 μm, /Λ=0.42, /Λ=0.86, and /Λ=0.9

Fig.5 Effective mode area (a) and nonlinear coefficient (b) of highly nonlinear PCF with/Λ=0.42, /Λ=0.86, /Λ=0.9, Λ=1 mm, and Ge-doped concentration =14 mol%

Fig.6 Cross section of proposed structure of DCPCF adopting 18 F-rods to form its outer ring core

Fig.7 Mode coupling process and dispersion curve of proposed DCPCF

Fig.8 Dispersion curves of proposed DCPCF with same pitch Λ=6 μm

Fig.9 Schematic diagram of drawing process of PCF

Fig.10 Curves of versus . (a) =1850°C, =15 m/min; (b) =1800°C, =2 mm/min; (c) =2 mm/min, =40 m/min

Fig.11 Two kinds of final geometry of PCF drawn from same preform with initial ratio of inner radius to outer radius 2/3. (a) /Λ=0.45; (b) /Λ=0.8

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