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Quantum Electronics and Laser Science Conference

Slow and fast light propagation in erbium-doped fiber

Nikolay N. Lepeshkin, Aaron Schweinsberg, Matthew S. Bigelow, George M. Gehring, Robert W. Boyd

Published Dec 10, 2005• 3 citations
Publisher

Abstract

We study propagation of light pulses and modulation in an Er-doped fiber in the regimes of anomalously slow and superluminal group velocities. The pulses experience either delay or advancement depending on the pump power.
DOI
10.1109/qels.2005.1548733

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We observe both extremely slow and superluminal pulse propagation speeds at room temperature in an erbium-doped fiber (EDF). A signal at 1550 nm is sent through an erbium-doped fiber with varying powers of a 980 nm pump. The degree of signal delay or advancement is found to depend significantly on the pump intensity. We observe a maximum fractional advancement of 0.124 and a maximum fractional delay of 0.089. The effect is demonstrated both for a sinusoidally modulated signal and for Gaussian pulses. The ability to control the sign and magnitude of the pulse velocity could have important implications for applications in photonics.
We study propagation oflight pulses andmodulation inanEr-doped fiber inthe regimes ofanomalously slowandsuperluminal groupvelocities. Thepulses experience either delay oradvancement depending onthepumppower. ©2004Optical Society ofAmerica OCIScodes: (060.5530) Pulse propagation andSolitons, (060.2410) Fibers, erbium Light propagation withultra-slow andsuperluminal group velocities havebeenrecently demonstrated insolid state materials atroomtemperature. Theanomalous group velocities caused theprocess ofCoherent Population Oscillations (CPO) wereobserved inruby(1), alexandrite (2), andultracold semiconductor quantum wells (3). In these experiments, theground state population oscillates atthebeat frequencies between thefields applied tothe system andcreates a narrowspectral feature intheabsorption spectrum. Thelinewidth ofthis feature is approximately theinverse oftheground state population recovery time. Inanabsorbing mediumtheoscillations lead toadelay inpulse propagation. Inamediumwithgain, theeffect isreversed andthegroupvelocity is superluminal andcould beevennegative.. Although theCPOapproach wasshowntowork, several practical aspects wereinneedofimprovement Longer interaction lengths aredesirable inorder toincrease fractional delays oradvancements. Anexternal control field that determines thegroup velocity ofthesignal pulses should beintegrated inthesystem. Being able tooperate at1550 nmwould beanimportant feature fortelecommunication applications