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Modern Physics Letters B

VARIABLE GROUP VELOCITY SLOWDOWN IN SLOW-LIGHT MEDIA

WEI QIU, Yundong Zhang, Jianbo Ye, He Tian, Jianfang Wang, Nan Wang, Hao Wang, Ping Yuan

Published Apr 10, 2008• 0 citations
Publisher

Abstract

We investigated the variations of group velocity slowdown in erbium-doped optical fiber. According to the population oscillation effect, the numerical model of the group velocity slowdown was established. From the theoretical calculation, the group velocity slowdown is tunable due to the variety of steady ground state erbium ion population [Formula: see text]. To validate the effect of ion population for slow light, the experimental research was implemented via highly-doped erbium fiber.

DOI
10.1142/s0217984908015140

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We investigated the variations of group velocity slowdown in erbium-doped optical fiber. According to the population oscillation effect, the numerical model of the group velocity slowdown was established. From the theoretical calculation, the group velocity slowdown is tunable due to the variety of steady ground state erbium ion population [Formula: see text]. To validate the effect of ion population for slow light, the experimental research was implemented via highly-doped erbium fiber.
Group velocity of the optical pulse propagation would be reduced based on coherent population oscillation effect in an absorbing medium. According to the absorption properties of erbium-doped optical fiber, there would appear a sharp absorption loss, which brought more difficulties to the actual measurement of slow light and its application in communications. From the ground rate equation of erbium-ion, the delay of optical pulse was simulated under controllable absorption loss， and experiments were implemented to verify the theoretical results. Moreover, we researched how the different pump power and fiber length effect the signal loss and the optical pulse delay.
According to the transition rates equation of the ground state population and the propagation equation,the numerical model of the group velocity slowdown was established. The relationship between the gain and pump power was analysized. In the absorption area of Tm3 +-dopedoptical fiber,the oscillation leads the pulse to experience absorption saturation,and the propagation delays.In the gain area of Tm3 +-doped optical fiber,this effect induces the pulse to experience gain saturation,and the propagation is in advance. According to the theoretical calculation,the group velocity slowdown is tunable due to coherent population oscillation in the Tm3 +-doped optical fiber amplifier at room temperature.
In this paper, we proposed a novel approach to demonstrate optically controllable pulse group velocity at telecommunication wavelengths in EDF due to CPO. First we reviewed recent advances in slow-light-based optical signal processing, then we study slow and fast light propagation in erbium doped fiber abstractly based on theory and simulation model. It is revealed though the research that the time delay and advancement depends greatly on the pump power, influence of the ion density on the group velocity of light propagation is also studied. Based on our discussion, the optimization parameters should be selected in order to obtain more appropriate time delay and the slowdown of group velocity, which is of great importance to the communication industry.
Because of the absorption of erbium-doped optical fiber, the group velocity of the optical pulse propagation is slowed down and the intensity of signal is reduced, which brings more difficulties to the actual measurement of slow light and its application in communications, such as the distortion and the low measurement.Therefore only after the group velocity slowdown of light pulse in erbium-doped optical fiber under no absorption loss is realized, can the slow light technology really have the practical application. We investigate the erbium-doped optical fiber amplifier deeply and develop a technology, in which the different pump powers and fiber lengths are used to reduce the signal loss through theoretical calculation and realize the group velocity slowdown of light pulse. The results show that no absorption loss is realized at a pump power of 3.5 mW, and we realize the slow light with a fiber length of 0.1 m when the pump power is zero.