Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

انجمن اپتیک و فوتونیک ایران

Optimization of Optical Bistability in Chalcogenide Nonlinear Fiber Bragg Gratings

Elham Yousefi, Mohsen Hatami

Published Feb 15, 2014• 0 citations
OpenAlex

Abstract

In this paper, we study the bistability characteristics of chalcogenide nonlinear FBGs. The effect of length and third order nonlinearity on On-Off switching ratio and intensity distribution in FBG are investigated numerically. We obtained that there exist an optimum FBG length, that on-off switching ratio is maximized and is independent of the third order nonlinearity.

Related papers

Bistability of ultrashort pulses in FBG under different nonlinearity profiles

Paulo Victor Ferreira Pinto, T. M. Pessoa, J. M. Jacinto +3 more

In this work, we studied the optical bistability of Fiber Bragg Grating (FBG) under nonlinear regime, considering three increasing and decreasing profiles of nonlinearity: linear, quadratic and exponential. We varied the nonlinearity range in each profile, and obtained different curves of bistability and reflectivity. We analyzed the powers [Formula: see text] and [Formula: see text], as well as the width of the photonic band gap ([Formula: see text] of each device under different nonlinearity profiles, and we observed the changes in reflectivity of the FBG. The power intensities [Formula: see text] and [Formula: see text] obtained for the bistability of decreasing profiles were lower than those obtained for the increasing profiles, and the values of [Formula: see text] were also lower in decreasing profiles, which is useful for optical switching applications.

Journal of Nonlinear Optical Physics & Materials•Jun 1, 2017•3 citations

Bistability and Switching in a Phase Shifted PT-Symmetric Fiber Bragg Grating

S. Hari Ramakrishnan, S. Vignesh Raja, A. Govindarajan +1 more

Using implicit Rungee-Kutta 4thorder method, we numerically report the optical bistablity and switching exhibited by a π-phase shifted nonlinear FBG with balanced gain and loss. Every control parameter which accounts for the variation in the hysteresis curve exhibited by the system is examined in detail. We begin with assessing the role of device length on the optical bistability and find that our system can exhibit switching at very short length of the fiber. Subsequently, the influence of coupling constant, detuning parameter and the nonlinearity on the switching power is also studied. The device exhibits switching at extremely low input intensities. Also, the effect of including the PT-symmetry on the switching characteristics of the device is investigated in brief.

International Conference on Vision Towards Emerging Trends in Communication and Networking (ViTECoN)•Mar 1, 2019•0 citations

Study on characteristics of optical bistable devices based on fiber Bragg grating

Yongjun Peng, Kun Qiu, Baojian Wu +1 more

The simulation model to bistable characteristics of grating is established by numerically solving the nonlinear coupledmode equations of Fiber Bragg Grating using 3-stage 4-order semi-implicit Runge - Kutta method. The impact of the grating parameters and operating point on S-shaped hysteresis loop parameters is researched. The results show that the area of S-shaped hysteresis loop, bistable operating condition, bistable threshold and dynamic range can be adjusted by changing the operating wavelength and grating parameters, such as grating length, grating apodization and average refractive index modulation depth of grating.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Nov 20, 2009•5 citations

Analysis of optical switching in a Yb3+-doped fiber Bragg grating by using self-phase modulation and cross-phase modulation

Zhigang Zang, Yujun Zhang

The optical performances of the all-optical switching based on Yb3+-doped fiber Bragg grating (FBG) are investigated under the case of self-phase modulation (SPM) and cross-phase modulation (XPM). For the SPM case, the optical bistability of FBG under different parameters is investigated. It shows that the width of the hysteresis loop and threshold switching power are strongly dependent on the fiber grating length, fiber grating detuning, and coupling constant. For the XPM case, the expressions of the threshold switching power in the different detuning range are given. The influence of parameters about different detuning and coupling constant to the threshold switching power and extinction ratio are also studied. In comparison with the SPM case, the switching power of FBG under XPM case can be reduced to less than 20 mW by optimizing the parameters of FBG.

Applied Optics•May 30, 2012•169 citations

Optical bistability in nonlinear long period fiber grating

Vishal Jain, Santosh Pawar, SHUBHADA KUMBHAJ +1 more

The nonlinear phenomena of optical bistablity is investigated analytically in chalcogenide glass long period fiber grating. Using the basic sets of nonlinear coupled mode equation the expression for the transmittivity of grating has been derived under nonlinear Kerr regime. To examine the bistable charateristics of the grating, the operating wavelength is considerd slightly above the resonance wavelength of 1550 nm i.e. for off resonance condition where detuning parameter δ≠0. It is observed that the intensity of the transmitted wave increases with increasing input intensity and reaches its maximum value at particular intensity. On gradual reduction of the input intensity, the transmitted intensity does not retrace the same path, resulting in a hysteresis loop. This hysteresis loop shows that the LPFG supports the occurrence of optical bistability.

AIP conference proceedings•Jan 1, 2020•0 citations

Theoretical investigation on the bistability of nonlinear Bragg gratings

Tian Jian-feng, Wu Zheng-Mao, Xia Guang-Qiong +1 more

Based on the coupled mode theory, the bistability performance of nonlinear Bragg gratings is analyzed theoretically in terms of elliptic integration. The analytical expression describing the relation between the input intensity and the output intensity is presented. Consequently, the dependence of the bistability on the gratings inner parameters is investigated numerically. The results show that, the bistability performance of the nonlinear Bragg gratings depends not only on the product of the couple coefficient and the grating length but also on the couple coefficient and the gratings length respectively.

Acta Physica Sinica•Jan 1, 2007•3 citations
In this paper, we study the bistability characteristics of chalcogenide nonlinear FBGs. The effect of length and third order nonlinearity on On-Off switching ratio and intensity distribution in FBG are investigated numerically. We obtained that there exist an optimum FBG length, that on-off switching ratio is maximized and is independent of the third order nonlinearity.
In this work, we studied the optical bistability of Fiber Bragg Grating (FBG) under nonlinear regime, considering three increasing and decreasing profiles of nonlinearity: linear, quadratic and exponential. We varied the nonlinearity range in each profile, and obtained different curves of bistability and reflectivity. We analyzed the powers [Formula: see text] and [Formula: see text], as well as the width of the photonic band gap ([Formula: see text] of each device under different nonlinearity profiles, and we observed the changes in reflectivity of the FBG. The power intensities [Formula: see text] and [Formula: see text] obtained for the bistability of decreasing profiles were lower than those obtained for the increasing profiles, and the values of [Formula: see text] were also lower in decreasing profiles, which is useful for optical switching applications.
Using implicit Rungee-Kutta 4thorder method, we numerically report the optical bistablity and switching exhibited by a π-phase shifted nonlinear FBG with balanced gain and loss. Every control parameter which accounts for the variation in the hysteresis curve exhibited by the system is examined in detail. We begin with assessing the role of device length on the optical bistability and find that our system can exhibit switching at very short length of the fiber. Subsequently, the influence of coupling constant, detuning parameter and the nonlinearity on the switching power is also studied. The device exhibits switching at extremely low input intensities. Also, the effect of including the PT-symmetry on the switching characteristics of the device is investigated in brief.
The simulation model to bistable characteristics of grating is established by numerically solving the nonlinear coupledmode equations of Fiber Bragg Grating using 3-stage 4-order semi-implicit Runge - Kutta method. The impact of the grating parameters and operating point on S-shaped hysteresis loop parameters is researched. The results show that the area of S-shaped hysteresis loop, bistable operating condition, bistable threshold and dynamic range can be adjusted by changing the operating wavelength and grating parameters, such as grating length, grating apodization and average refractive index modulation depth of grating.
The optical performances of the all-optical switching based on Yb3+-doped fiber Bragg grating (FBG) are investigated under the case of self-phase modulation (SPM) and cross-phase modulation (XPM). For the SPM case, the optical bistability of FBG under different parameters is investigated. It shows that the width of the hysteresis loop and threshold switching power are strongly dependent on the fiber grating length, fiber grating detuning, and coupling constant. For the XPM case, the expressions of the threshold switching power in the different detuning range are given. The influence of parameters about different detuning and coupling constant to the threshold switching power and extinction ratio are also studied. In comparison with the SPM case, the switching power of FBG under XPM case can be reduced to less than 20 mW by optimizing the parameters of FBG.
The nonlinear phenomena of optical bistablity is investigated analytically in chalcogenide glass long period fiber grating. Using the basic sets of nonlinear coupled mode equation the expression for the transmittivity of grating has been derived under nonlinear Kerr regime. To examine the bistable charateristics of the grating, the operating wavelength is considerd slightly above the resonance wavelength of 1550 nm i.e. for off resonance condition where detuning parameter δ≠0. It is observed that the intensity of the transmitted wave increases with increasing input intensity and reaches its maximum value at particular intensity. On gradual reduction of the input intensity, the transmitted intensity does not retrace the same path, resulting in a hysteresis loop. This hysteresis loop shows that the LPFG supports the occurrence of optical bistability.
Based on the coupled mode theory, the bistability performance of nonlinear Bragg gratings is analyzed theoretically in terms of elliptic integration. The analytical expression describing the relation between the input intensity and the output intensity is presented. Consequently, the dependence of the bistability on the gratings inner parameters is investigated numerically. The results show that, the bistability performance of the nonlinear Bragg gratings depends not only on the product of the couple coefficient and the grating length but also on the couple coefficient and the gratings length respectively.