This paper presents the development of a highly efficient CT-PCF (Core-Tune Photonic Crystal Fiber) with substantial birefringence, tailored for applications in high-bit-rate communication and sensing while minimizing...This paper presents the development of a highly efficient CT-PCF (Core-Tune Photonic Crystal Fiber) with substantial birefringence, tailored for applications in high-bit-rate communication and sensing while minimizing signal loss. The design incorporates a modified broadband dispersion compensating structure, optimized for operation across the E, S, C, and L communication bands within a wavelength range spanning 1360 nm to 1625 nm. Notably, the CT-PCF demonstrates a remarkable birefringence of 2.372 × 10<sup>-2</sup> at 1550 nm, surpassing traditional PCF structures. Single-mode performance is evaluated using the Higher Order Mode Extinction Ratio (HOMER) method, revealing a peak HOMER value of 10<sup>4</sup> at 1550 nm. Furthermore, at 1550 nm, the CT-PCF exhibits exceptional nonlinear characteristics, featuring a high nonlinearity of 50.74 W<sup>-1</sup>⋅Km<sup>-1</sup> for y polarization. In comparison to existing designs, the proposed CT-PCF exhibits superior performance metrics and optical characteristics. Additionally, the y polarization dispersion coefficient of the CT-PCF at 1550 nm is measured at -3534 ps/(nm⋅km). Overall, the CT-PCF represents a significant advancement, outperforming established systems in terms of performance metrics and optical properties.展开更多
Tuberculosis is one of the most contagious and lethal illnesses in the world,according to the World Health Organization.Tuberculosis had the leading mortality rate as a result of a single infection,ranking above HIV/A...Tuberculosis is one of the most contagious and lethal illnesses in the world,according to the World Health Organization.Tuberculosis had the leading mortality rate as a result of a single infection,ranking above HIV/AIDS.Early detection is an essential factor in patient treatment and can improve the survival rate.Detection methods should have high mobility,high accuracy,fast detection,and low losses.This work presents a novel biomedical photonic crystal fiber sensor,which can accurately detect and distinguish between the different types of tuberculosis bacteria.The designed sensor detects these types with high relative sensitivity and negligible losses compared to other photonic crystal fiber-based biomedical sensors.The proposed sensor exhibits a relative sensitivity of 90.6%,an effective area of 4.342×10^(-8)m^(2),with a negligible confinement loss of 3.13×10^(-9)cm^(-1),a remarkably low effective material loss of 0.0132cm-f,and a numerical aperture of 0.3462.The proposed sensor is capable of operating in the terahertz regimes over a wide range(1 THz-2.4 THz).An abbreviated review of non-optical detection techniques is also presented.An in-depth comparison between this work and recent related photonic crystal fiber-based literature is drawn to validate the efficacy and authenticity of the proposed design.展开更多
A new type ultraflattened dispersion square-lattice photonic crystal fiber with two different air-hole diameters in cladding region is proposed and the dispersion is investigated using a compact 2-D finite difference ...A new type ultraflattened dispersion square-lattice photonic crystal fiber with two different air-hole diameters in cladding region is proposed and the dispersion is investigated using a compact 2-D finite difference frequency domain method with the anisotropic perfectly matched layers (PML) absorbing boundary conditions. Through numerical simulation and opti- mizing the geometrical parameters, we find that the photonic crystal fibers proposed can realize ultraflattened dispersion of 0±0.06 ps/(km·nm) in wavelength range of 1.375 μm to 1.605 μm, which is more flat than that of triangular PCF, and the confinement loss is as low as about 0.01 dB/km at wavelength of 1.55 μm.展开更多
With the benefits of low latency,wide transmission bandwidth,and large mode field area,hollow-core antiresonant fiber(HC-ARF)has been a research hotspot in the past decade.In this paper,a hollow core step-index antire...With the benefits of low latency,wide transmission bandwidth,and large mode field area,hollow-core antiresonant fiber(HC-ARF)has been a research hotspot in the past decade.In this paper,a hollow core step-index antiresonant fiber(HC-SARF),with stepped refractive indices cladding,is proposed and numerically demonstrated with the benefits of loss reduction and bending improvement.Glass-based capil-laries with both high(n=1.45)and low(as low as n=1.36)refractive indices layers are introduced and formatted in the cladding air holes.Using the finite element method to perform numerical analysis of the designed fiber,results show that at the laser wavelengths of 980 and 1064 nm,the confinement loss is favorably reduced by about 6 dB/km compared with the conventional uniform cladding HC-ARF.The bending loss,around 15 cm bending radius of this fiber,is also reduced by 2 dB/km.The cladding air hole radius in this fiber is further investigated to optimize the confinement loss and the mode field diameter with single-mode transmission behavior.This proposed HC-SARF has great potential in optical fiber transmission and high energy delivery.展开更多
In this paper,a novel all-solid anti-resonant single crystal fiber(AR-SCF)with high refractive index tubes cladding is proposed.By producing the cladding tubes with high refractive index material,the AR guiding mechan...In this paper,a novel all-solid anti-resonant single crystal fiber(AR-SCF)with high refractive index tubes cladding is proposed.By producing the cladding tubes with high refractive index material,the AR guiding mechanism can be realized for the SCF,which can reduce the mode number to achieve single-mode or few-mode transmission.The influences of dif-ferent materials and structures on the confinement loss and effective guided mode number for wavelengths of 2-3μm are investigated.Then,the optimal AR-SCF structures for different wavelengths are determined.Furthermore,the influences of different fabrication errors are analyzed.This work would provide insight to new opportunities in the novel design of SCFs by AR,which would greatly impact the fields of laser application,supercontinum generation,and SCF sensors.展开更多
A photonic crystal fiber(PCF)for sensing of sulfuric acid is designed and analyzed using Comsol Multiphysics.To analyze the sensor performance,0%,10%,20%,30%,40%H2SO4 solution is placed into the fiber separately and t...A photonic crystal fiber(PCF)for sensing of sulfuric acid is designed and analyzed using Comsol Multiphysics.To analyze the sensor performance,0%,10%,20%,30%,40%H2SO4 solution is placed into the fiber separately and then relative sensitivity,confinement loss,birefringence,effective area etc.are investigated for each solution over wavelength ranging from 0.8 to 1.8μm.The sensor structure affords moderately high relative sensitivity and around 63.4%sensitivity is achieved for the highest concentration of H2SO4 at the wavelength 1.5|im inxpolarization direction.This PCF model also shows zero confinement loss for all solutions of H2SO4 over wavelength ranging from 1 to 1.35μm and later on approximately 1.422×10^-17 dB/km confinement loss is found for the highest concentration of H2SO4 at 1.5|im wavelength.Besides,higher birefringence is attained when the concentration of sulfuric acid is lower and it is achieved 7.5×10^-4 at 1.5μm wavelength.Moreover,higher sensing area is achieved at high concentration of sulfuric acid.展开更多
文摘This paper presents the development of a highly efficient CT-PCF (Core-Tune Photonic Crystal Fiber) with substantial birefringence, tailored for applications in high-bit-rate communication and sensing while minimizing signal loss. The design incorporates a modified broadband dispersion compensating structure, optimized for operation across the E, S, C, and L communication bands within a wavelength range spanning 1360 nm to 1625 nm. Notably, the CT-PCF demonstrates a remarkable birefringence of 2.372 × 10<sup>-2</sup> at 1550 nm, surpassing traditional PCF structures. Single-mode performance is evaluated using the Higher Order Mode Extinction Ratio (HOMER) method, revealing a peak HOMER value of 10<sup>4</sup> at 1550 nm. Furthermore, at 1550 nm, the CT-PCF exhibits exceptional nonlinear characteristics, featuring a high nonlinearity of 50.74 W<sup>-1</sup>⋅Km<sup>-1</sup> for y polarization. In comparison to existing designs, the proposed CT-PCF exhibits superior performance metrics and optical characteristics. Additionally, the y polarization dispersion coefficient of the CT-PCF at 1550 nm is measured at -3534 ps/(nm⋅km). Overall, the CT-PCF represents a significant advancement, outperforming established systems in terms of performance metrics and optical properties.
文摘Tuberculosis is one of the most contagious and lethal illnesses in the world,according to the World Health Organization.Tuberculosis had the leading mortality rate as a result of a single infection,ranking above HIV/AIDS.Early detection is an essential factor in patient treatment and can improve the survival rate.Detection methods should have high mobility,high accuracy,fast detection,and low losses.This work presents a novel biomedical photonic crystal fiber sensor,which can accurately detect and distinguish between the different types of tuberculosis bacteria.The designed sensor detects these types with high relative sensitivity and negligible losses compared to other photonic crystal fiber-based biomedical sensors.The proposed sensor exhibits a relative sensitivity of 90.6%,an effective area of 4.342×10^(-8)m^(2),with a negligible confinement loss of 3.13×10^(-9)cm^(-1),a remarkably low effective material loss of 0.0132cm-f,and a numerical aperture of 0.3462.The proposed sensor is capable of operating in the terahertz regimes over a wide range(1 THz-2.4 THz).An abbreviated review of non-optical detection techniques is also presented.An in-depth comparison between this work and recent related photonic crystal fiber-based literature is drawn to validate the efficacy and authenticity of the proposed design.
基金supported by the National Natural ScienceFoundation of China (Grant Nos. 60637010 and 60671036)the National Basic Research Program of China (Grant No.2007CB310403).
文摘A new type ultraflattened dispersion square-lattice photonic crystal fiber with two different air-hole diameters in cladding region is proposed and the dispersion is investigated using a compact 2-D finite difference frequency domain method with the anisotropic perfectly matched layers (PML) absorbing boundary conditions. Through numerical simulation and opti- mizing the geometrical parameters, we find that the photonic crystal fibers proposed can realize ultraflattened dispersion of 0±0.06 ps/(km·nm) in wavelength range of 1.375 μm to 1.605 μm, which is more flat than that of triangular PCF, and the confinement loss is as low as about 0.01 dB/km at wavelength of 1.55 μm.
基金the National Natural Science Foundation of China(Grant No.62075074)the National Key R&D Program of China(Nos.2018YFF01011800 and 2018YFB2201901).
文摘With the benefits of low latency,wide transmission bandwidth,and large mode field area,hollow-core antiresonant fiber(HC-ARF)has been a research hotspot in the past decade.In this paper,a hollow core step-index antiresonant fiber(HC-SARF),with stepped refractive indices cladding,is proposed and numerically demonstrated with the benefits of loss reduction and bending improvement.Glass-based capil-laries with both high(n=1.45)and low(as low as n=1.36)refractive indices layers are introduced and formatted in the cladding air holes.Using the finite element method to perform numerical analysis of the designed fiber,results show that at the laser wavelengths of 980 and 1064 nm,the confinement loss is favorably reduced by about 6 dB/km compared with the conventional uniform cladding HC-ARF.The bending loss,around 15 cm bending radius of this fiber,is also reduced by 2 dB/km.The cladding air hole radius in this fiber is further investigated to optimize the confinement loss and the mode field diameter with single-mode transmission behavior.This proposed HC-SARF has great potential in optical fiber transmission and high energy delivery.
基金This work was supported in part by the Fundamental Research Funds for the Central Universities(No.2019JBM345)in part by the Beijing Natural Science Foundation(No.4192047)in part by the National Natural Science Foundation of China(Grant No.61875064).
文摘In this paper,a novel all-solid anti-resonant single crystal fiber(AR-SCF)with high refractive index tubes cladding is proposed.By producing the cladding tubes with high refractive index material,the AR guiding mechanism can be realized for the SCF,which can reduce the mode number to achieve single-mode or few-mode transmission.The influences of dif-ferent materials and structures on the confinement loss and effective guided mode number for wavelengths of 2-3μm are investigated.Then,the optimal AR-SCF structures for different wavelengths are determined.Furthermore,the influences of different fabrication errors are analyzed.This work would provide insight to new opportunities in the novel design of SCFs by AR,which would greatly impact the fields of laser application,supercontinum generation,and SCF sensors.
文摘A photonic crystal fiber(PCF)for sensing of sulfuric acid is designed and analyzed using Comsol Multiphysics.To analyze the sensor performance,0%,10%,20%,30%,40%H2SO4 solution is placed into the fiber separately and then relative sensitivity,confinement loss,birefringence,effective area etc.are investigated for each solution over wavelength ranging from 0.8 to 1.8μm.The sensor structure affords moderately high relative sensitivity and around 63.4%sensitivity is achieved for the highest concentration of H2SO4 at the wavelength 1.5|im inxpolarization direction.This PCF model also shows zero confinement loss for all solutions of H2SO4 over wavelength ranging from 1 to 1.35μm and later on approximately 1.422×10^-17 dB/km confinement loss is found for the highest concentration of H2SO4 at 1.5|im wavelength.Besides,higher birefringence is attained when the concentration of sulfuric acid is lower and it is achieved 7.5×10^-4 at 1.5μm wavelength.Moreover,higher sensing area is achieved at high concentration of sulfuric acid.
