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Tunable propagation delay offemtosecond pulses ina quantum-dot optical amplifier atroomtemperature

M. vanderPoel, Jesper Mørk, M. Hvam

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

Optically induced dispersion overalarge bandwidth of2.6THzisusedtoslowor speed upa150fspulse inaquantum-dot optical amplifier. A group refractive index change of 4*10-3 isobserved. ©2000 Optical Society ofAmerica OCIScodes: (250.5980) Semiconductor optical amplifiers; (190.5530) Pulse propagation andsolitons

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Tunable propagation delay of femtosecond pulses in a quantum-dot optical amplifier at room temperature

M. van der Poel, Jesper Mørk, J. M. Hvam

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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

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Nonlinear pulse propagation in InAs/InP quantum dot optical amplifiers: Rabi oscillations in the presence of nonresonant nonlinearities

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Controlling the group velocity of light has great potential applications in future optical communication, photonic computing, and microwave signal processing. These applications have recently triggered immense experimental and theoretical interest in the research community. Numerous studies report large optical delays while sacrificing many important aspects of engineering feasibility: bandwidth, device compactness, room temperature operation, ease of integration, and minimized signal insertion loss. Slow and fast light in the quantum-dot and quantum-well semiconductor optical amplifiers (SOAs) address many of these characteristics. First, this dissertation presents variable slow light in quantum-dot SOAs using population oscillation in an absorptive medium. Bandwidth tuning of slow light is observed with forward and reverse bias of quantum-dots. Second, the study explores four-wave mixing and population oscillation in a quantum-well gain medium. Control of optical advance and bandwidth is achieved by the medium's electrical bias or the optical pump power. Moreover, the fast light in the cascade of N number of quantum-well SOAs is experimentally and theoretically investigated. The cascaded scheme uses SOA-to-SOA attenuators to achieve active delay-bandwidth control. Finally, a large delay-bandwidth scheme is presented in which slow-to-fast light is observed by means of absorption to gain switching. More than a half cycle of tunable delay at 1 GHz bandwidth is achieved at optical frequencies.

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Slow and fast light in quantum-well (QW) and quantum-dot (QD) semiconductor optical amplifiers (SOAs) using nonlinear quantum optical effects are presented.We demonstrate electrical and optical controls of fast light using the coherent population oscillation (CPO) and four wave mixing (FWM) in the gain regime of QW SOAs.We then consider the dependence on the wavelength and modal gain of the pump in QW SOAs.To enhance the tunable photonic delay of a single QW SOA, we explore a serial cascade of multiple amplifiers.A model for the number of QW SOAs in series with variable optical attenuation is developed and matched to the experimental data.We demonstrate the scaling law and the bandwidth control by using the serial cascade of multiple QW SOAs.Experimentally, we achieve a phase change of 160 • and a scaling factor of four at 1 GHz using the cascade of four QW SOAs.Finally, we investigate CPO and FWM slow and fast light of QD SOAs.The experiment shows that the bandwidth of the time delay as a function of the modulation frequency changes in the absorption and gain regimes due to the carrier-lifetime variation.The tunable phase shift in QD SOA is compared between the ground-and first excited-state transitions with different modal gains.

Chinese Optics Letters•Jan 1, 2008•3 citations
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
Controlling the group velocity of light has great potential applications in future optical communication, photonic computing, and microwave signal processing. These applications have recently triggered immense experimental and theoretical interest in the research community. Numerous studies report large optical delays while sacrificing many important aspects of engineering feasibility: bandwidth, device compactness, room temperature operation, ease of integration, and minimized signal insertion loss. Slow and fast light in the quantum-dot and quantum-well semiconductor optical amplifiers (SOAs) address many of these characteristics. First, this dissertation presents variable slow light in quantum-dot SOAs using population oscillation in an absorptive medium. Bandwidth tuning of slow light is observed with forward and reverse bias of quantum-dots. Second, the study explores four-wave mixing and population oscillation in a quantum-well gain medium. Control of optical advance and bandwidth is achieved by the medium's electrical bias or the optical pump power. Moreover, the fast light in the cascade of N number of quantum-well SOAs is experimentally and theoretically investigated. The cascaded scheme uses SOA-to-SOA attenuators to achieve active delay-bandwidth control. Finally, a large delay-bandwidth scheme is presented in which slow-to-fast light is observed by means of absorption to gain switching. More than a half cycle of tunable delay at 1 GHz bandwidth is achieved at optical frequencies.
Slow and fast light in quantum-well (QW) and quantum-dot (QD) semiconductor optical amplifiers (SOAs) using nonlinear quantum optical effects are presented.We demonstrate electrical and optical controls of fast light using the coherent population oscillation (CPO) and four wave mixing (FWM) in the gain regime of QW SOAs.We then consider the dependence on the wavelength and modal gain of the pump in QW SOAs.To enhance the tunable photonic delay of a single QW SOA, we explore a serial cascade of multiple amplifiers.A model for the number of QW SOAs in series with variable optical attenuation is developed and matched to the experimental data.We demonstrate the scaling law and the bandwidth control by using the serial cascade of multiple QW SOAs.Experimentally, we achieve a phase change of 160 • and a scaling factor of four at 1 GHz using the cascade of four QW SOAs.Finally, we investigate CPO and FWM slow and fast light of QD SOAs.The experiment shows that the bandwidth of the time delay as a function of the modulation frequency changes in the absorption and gain regimes due to the carrier-lifetime variation.The tunable phase shift in QD SOA is compared between the ground-and first excited-state transitions with different modal gains.