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

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

The transition from slow to fast light based on coherent population oscillation in a cascaded Erbium-doped fiber structure

Weikun Yu, Shuguang Lu, Lingling Gu, Jin Zhou, Xiaodan Wei, Ming Shiann Feng, Yigang Li

Published Nov 29, 2012• 0 citations
Publisher

Abstract

We analyze the transition from slow to fast light upon increasing the modulation frequency based on coherent population oscillation in Cascaded Erbium-doped fiber structure. The change from slow to fast light is more obvious in the Cascaded structure. In this structure, the transition bandwidth is lager and the relative delay difference between the maximum fractional advancement and the maximum fractional delay is greater than that in the single-stage fiber.

DOI
10.1117/12.2000446

Related papers

Light transmission speed of different hybrid pump cascade structures in Er3+ doped fiber

Yu Wang, Xiangmei Liu, Wei Qiu +3 more

In this paper, the general theory of generating fast light and slow light in erbium-doped fiber by hybrid pump cascade structure based on coherent population oscillation effect is given. Through numerical simulation, the effects of pump optical power ratio ([Formula: see text]) on gain, group-induced refractive index [Formula: see text], time delay and fractional delay of pumping structure (1480 and 980[Formula: see text]nm) and pumping structure (980 and 1480[Formula: see text]nm) are studied and analyzed. The effects of pumping structure and pumping direction on time delay, fractional delay and fast/slow light conversion are discussed. In addition, the effects of different pump optical power ratios ([Formula: see text]) on time delay and fractional delay are also discussed. Compared with previous methods such as changing the interaction length and doping ion density, a more suitable optical transmission speed can be obtained by adjusting pump composition, pump direction and pump ratio ([Formula: see text]). This may lead to the optimization of optical communication systems.

Journal of Nonlinear Optical Physics & Materials•Mar 15, 2024•0 citations

Study on the relationship between the population of metastable state and time delay in an erbium-doped optical fiber

Qiu Wei, 高波 Gao Bo, Peng Lin +5 more

The slow light propagation in optical fiber has attracted much attention because of its practical applications. Use of coherent population oscillation to produce slow light propagation has many advantages over other methods. We investigate the reduction of the group velocity propagation by the coherent population oscillation in erbium-doped optical fiber, and also the relationship between the population of metastable state and the time delay by changing the doping concentration, the length of the fiber, the input power, and the pump power. The results show that we can select a high doping concentration of erbium in the fiber, increase the length of the fiber, decrease the pump power and select the appropriate power of the signal light to increases the time delay.

Acta Physica Sinica•Jan 1, 2013•1 citation

Slow light propagation experiments in highly-doped erbium fibers

Sonia Melle, Óscar G. Calderón, F. Carreño +3 more

We experimentally study slow light propagation in highly-doped erbium fibers by using an amplitude modulated signal. The frequency of the maximum fractional delay shifts to smaller values when increasing ions density.

Slow and Fast Light (SL)•Jan 1, 2006•0 citations

Tunable optical delay with low intensity loss in a cascade structure Er3+-doped optical fiber amplifier

Yuan Gao, Wei Qiu, Yuqi Wu +4 more

In this paper, we propose a new pumping scheme—a dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber based on the theory of coherent population oscillation. While realizing slow light transmission, the loss of output signal light power is reduced. Using numerical simulation, we compare the effects of a single fiber without pumping, a 980 nm single pumping single fiber, and a dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber on signal light intensity loss coefficient τ and maximum time delay with the increase of input signal light power. The results show that the signal light intensity loss coefficient τ of the three structures decreases gradually with the increase of input signal light power. However, the transmission of lower signal light intensity loss coefficient τ=0.0823 and a larger time delay of 0.15 ms can be obtained under the dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber. On the basis of the dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber, the signal light intensity loss coefficient τ decreases gradually with the increase of pump ratio M (M=P1480∶P980) and the decrease of length ratio N (N=L2∶L1; L1 and L2 represent the length of the first and second cascaded optical fibers, respectively). Moreover, we compare the effects of ion density of the Er3+-doped optical fiber on the time delay of three structures. The dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber can provide a larger time delay and smaller signal light intensity loss coefficient τ at low ion density of the Er3+-doped optical fiber.

Applied Optics•Jun 26, 2019•0 citations

Slowdown of group velocity of light in dual-frequency laser-pumped cascade structure of Er 3+ -doped optical fiber at room temperature

Wei Qiu, Yujing Yang, Yuan Gao +3 more

Abstract Slow light is demonstrated in the cascade structure of an erbium-doped fiber with two forward propagation pumps. The results of the numerical simulation of the time delay and the optimum modulation frequency complement each other. The time delay and the optimum modulation frequency depend on the pump ratio G ( G = P 1480 : P 980 ). The discussion results of this paper show that a larger time delay of slow light propagation can be obtained in the cascade structure of Er 3+ -doped optical fibers with dual-frequency laser pumping. Compared to previous research methods, the dual-frequency laser-pumped cascade structure of an Er 3+ -doped optical fiber is more controllable. Based on our discussion the pump ratio G should be selected in order to obtain a more appropriate time delay and the slowdown of group velocity.

Laser Physics Letters•Feb 22, 2018•4 citations

Effect of ion pairs in fast-light bandwidth in high-concentration erbium-doped fibers

Óscar G. Calderón, Sonia Melle, Francisco Arrieta-Yáñez +2 more

The effect of ion pairs in high-concentration erbium-doped fibers on slow- and fast-light propagation enabled by coherent population oscillations at room temperature has been experimentally investigated. We find that an increase of the erbium ion concentration increases the fractional advancement although it degrades the bandwidth of the modulated signals that propagate at superluminal velocities due to the presence of ion pairs in the fiber.

Journal of the Optical Society of America B•Sep 16, 2008•9 citations
We analyze the transition from slow to fast light upon increasing the modulation frequency based on coherent population oscillation in Cascaded Erbium-doped fiber structure. The change from slow to fast light is more obvious in the Cascaded structure. In this structure, the transition bandwidth is lager and the relative delay difference between the maximum fractional advancement and the maximum fractional delay is greater than that in the single-stage fiber.
In this paper, the general theory of generating fast light and slow light in erbium-doped fiber by hybrid pump cascade structure based on coherent population oscillation effect is given. Through numerical simulation, the effects of pump optical power ratio ([Formula: see text]) on gain, group-induced refractive index [Formula: see text], time delay and fractional delay of pumping structure (1480 and 980[Formula: see text]nm) and pumping structure (980 and 1480[Formula: see text]nm) are studied and analyzed. The effects of pumping structure and pumping direction on time delay, fractional delay and fast/slow light conversion are discussed. In addition, the effects of different pump optical power ratios ([Formula: see text]) on time delay and fractional delay are also discussed. Compared with previous methods such as changing the interaction length and doping ion density, a more suitable optical transmission speed can be obtained by adjusting pump composition, pump direction and pump ratio ([Formula: see text]). This may lead to the optimization of optical communication systems.
The slow light propagation in optical fiber has attracted much attention because of its practical applications. Use of coherent population oscillation to produce slow light propagation has many advantages over other methods. We investigate the reduction of the group velocity propagation by the coherent population oscillation in erbium-doped optical fiber, and also the relationship between the population of metastable state and the time delay by changing the doping concentration, the length of the fiber, the input power, and the pump power. The results show that we can select a high doping concentration of erbium in the fiber, increase the length of the fiber, decrease the pump power and select the appropriate power of the signal light to increases the time delay.
In this paper, we propose a new pumping scheme—a dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber based on the theory of coherent population oscillation. While realizing slow light transmission, the loss of output signal light power is reduced. Using numerical simulation, we compare the effects of a single fiber without pumping, a 980 nm single pumping single fiber, and a dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber on signal light intensity loss coefficient τ and maximum time delay with the increase of input signal light power. The results show that the signal light intensity loss coefficient τ of the three structures decreases gradually with the increase of input signal light power. However, the transmission of lower signal light intensity loss coefficient τ=0.0823 and a larger time delay of 0.15 ms can be obtained under the dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber. On the basis of the dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber, the signal light intensity loss coefficient τ decreases gradually with the increase of pump ratio M (M=P1480∶P980) and the decrease of length ratio N (N=L2∶L1; L1 and L2 represent the length of the first and second cascaded optical fibers, respectively). Moreover, we compare the effects of ion density of the Er3+-doped optical fiber on the time delay of three structures. The dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber can provide a larger time delay and smaller signal light intensity loss coefficient τ at low ion density of the Er3+-doped optical fiber.
Abstract Slow light is demonstrated in the cascade structure of an erbium-doped fiber with two forward propagation pumps. The results of the numerical simulation of the time delay and the optimum modulation frequency complement each other. The time delay and the optimum modulation frequency depend on the pump ratio G ( G = P 1480 : P 980 ). The discussion results of this paper show that a larger time delay of slow light propagation can be obtained in the cascade structure of Er 3+ -doped optical fibers with dual-frequency laser pumping. Compared to previous research methods, the dual-frequency laser-pumped cascade structure of an Er 3+ -doped optical fiber is more controllable. Based on our discussion the pump ratio G should be selected in order to obtain a more appropriate time delay and the slowdown of group velocity.