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

Europhysics Letters (EPL)

Slow propagation of externally injected light pulses in coupled semiconductor laser array

Jacob Scheuer

Published Feb 1, 2007• 15 citations
Publisher

Abstract

The propagation on an optical pulse injected into an array of semiconductor lasers is studied. Below lasing threshold, the array supports distortion-free, low-loss, slow-light propagation. Approximated expressions for the group velocity and the attenuation coefficient are derived analytically and verified numerically. The tradeoffs between the amplitude attenuation and the group delay are analyzed and an optimal pumping level, providing maximum output power for a desirable delay, is found.

DOI
10.1209/0295-5075/77/44004

Related papers

Dynamical Slowing and trapping of light in coupled semiconductor laser arrays

Yuval Yifat, Jacob Scheuer

We propose and analyze a new scheme for storing and releasing optical pulses comprising an array of weakly coupled semiconductor lasers. By activating and deactivating individual lasers in the array we are able to manipulate optical pulses, trap them for long periods and release them without noticeable distortion. In addition, the proposed scheme can also regenerate and reshape distorted pulses all-optically. Additional applications such as routing, pulse synchronization and true-time-delaying are also presented and discussed.

Optics Express•Sep 16, 2009•2 citations

Off-resonance slow light

R. N. Shakhmuratov, J. Odeurs

We consider the propagation of a light pulse in a medium with a single resonance. If the frequency of the pulse is tuned far from resonance and the pulse duration is much shorter than the lifetime of the excited state of the resonant particles in the medium (atoms in a gas, impurity ions in a solid, etc.), the group velocity of the pulse is appreciably reduced. It is shown that the slowing down of the group velocity of the pulse is accompanied with a pulse chirp, which produces a pulse broadening in time. It is proposed to use two samples in sequence with opposite chirps (up chirp and down chirp or vice versa) compensating the pulse broadening. Then the pulse can be delayed with almost no losses, distortion, and broadening. However, there is a maximum distance, beyond which the pulse experiences corruption. Pumping with an auxiliary laser beam can control the delay time of the light pulse in the medium. Conditions to eliminate the contribution of the dephasing processes in the pulse propagation are considered.

Physical Review A•Dec 31, 2008•12 citations

A unified description of semiconductor lasers with external light injection and its application to optical bistability

Linlin Li

A unified description for semiconductor lasers based from below to above threshold with external light injection is presented using small-signal analysis. The threshold of a semiconductor laser can be reduced by external light injection. The gain change of the laser due to external light injection reaches its maximum just at threshold. Optical bistability in a semiconductor laser is found to be varied continuously from below to above threshold. An analytical expression for the bistable loop bandwidth is presented. There is an optical bias for a laser to maximize the loop bandwidth for a fixed injection power. The results are in good agreement with experiments.>

IEEE Journal of Quantum Electronics•Jan 1, 1994•27 citations

Numerical simulation of slow light in the semiconductor optical amplifier

Zhaoying Wang, Miaomiao Hu, Dongfang Jia +1 more

Optoelectronic technology played a pivotal role in the unprecedented information revolution in the past two decades. One of the remaining grand challenges is the ability to store an optical signal in optical format. So slowing down the velocity of light have recently attracted substantial interest. In various mechanisms of slow light generation, semiconductor optical amplifier (SOA) attracts much attention because it offers the advantage of compactness, room temperature operation, electric-optical controllable and easy integration with existing optical communication systems. In this paper, slow light generation in SOA using four wave mixing (FWM) effect is analyzed. The dynamic changes of the signal light time delay with the outside controllable parameters, such as the injection current into SOA, the pump light power, the detuning frequency between pump light and signal light, are numerically solved on the basis of the theory of refractive modulation-index and the sub-sections model of SOA. This method has the advantage of accurate simulated results and providing the explicit relationships between the controllable parameters with the signal light time delay for the practical experiment.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Nov 3, 2010•0 citations

Delay limit of slow light in semiconductor optical amplifiers

Alexander V. Uskov, Forrest G. Sedgwick, Connie J. Chang-Hasnain

In contrast to absorbers, where the delay time via wave mixing saturates to its maximum with increasing device length due to decay of pump power along the device, in semiconductor optical amplifiers (SOAs) the delay time increases with the device length and is limited by the corresponding growth of the SOA gain, which can lead to unacceptable amplified stimulated emission in the SOA. The number of pulses which can be stored in an SOA, defined by the gain and group velocity dispersion, also is given ultimately by this SOA gain limitation, and is estimated between one and two.

IEEE Photonics Technology Letters•Mar 1, 2006•33 citations

Coupled semiconductor laser arrays and their applications

Jacob Scheuer, Yuval Yifat

We propose a new scheme for manipulating optical information by trapping and releasing optical pulses propagating in an array of coupled semiconductor lasers. The manipulation of the optical pulses is achieved directly by changing the pump parameter of the individual lasers. Applications such as optical routing, delay lines and memories are studied in detail.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Dec 29, 2008•0 citations
The propagation on an optical pulse injected into an array of semiconductor lasers is studied. Below lasing threshold, the array supports distortion-free, low-loss, slow-light propagation. Approximated expressions for the group velocity and the attenuation coefficient are derived analytically and verified numerically. The tradeoffs between the amplitude attenuation and the group delay are analyzed and an optimal pumping level, providing maximum output power for a desirable delay, is found.
We propose and analyze a new scheme for storing and releasing optical pulses comprising an array of weakly coupled semiconductor lasers. By activating and deactivating individual lasers in the array we are able to manipulate optical pulses, trap them for long periods and release them without noticeable distortion. In addition, the proposed scheme can also regenerate and reshape distorted pulses all-optically. Additional applications such as routing, pulse synchronization and true-time-delaying are also presented and discussed.
We consider the propagation of a light pulse in a medium with a single resonance. If the frequency of the pulse is tuned far from resonance and the pulse duration is much shorter than the lifetime of the excited state of the resonant particles in the medium (atoms in a gas, impurity ions in a solid, etc.), the group velocity of the pulse is appreciably reduced. It is shown that the slowing down of the group velocity of the pulse is accompanied with a pulse chirp, which produces a pulse broadening in time. It is proposed to use two samples in sequence with opposite chirps (up chirp and down chirp or vice versa) compensating the pulse broadening. Then the pulse can be delayed with almost no losses, distortion, and broadening. However, there is a maximum distance, beyond which the pulse experiences corruption. Pumping with an auxiliary laser beam can control the delay time of the light pulse in the medium. Conditions to eliminate the contribution of the dephasing processes in the pulse propagation are considered.
A unified description for semiconductor lasers based from below to above threshold with external light injection is presented using small-signal analysis. The threshold of a semiconductor laser can be reduced by external light injection. The gain change of the laser due to external light injection reaches its maximum just at threshold. Optical bistability in a semiconductor laser is found to be varied continuously from below to above threshold. An analytical expression for the bistable loop bandwidth is presented. There is an optical bias for a laser to maximize the loop bandwidth for a fixed injection power. The results are in good agreement with experiments.>
Optoelectronic technology played a pivotal role in the unprecedented information revolution in the past two decades. One of the remaining grand challenges is the ability to store an optical signal in optical format. So slowing down the velocity of light have recently attracted substantial interest. In various mechanisms of slow light generation, semiconductor optical amplifier (SOA) attracts much attention because it offers the advantage of compactness, room temperature operation, electric-optical controllable and easy integration with existing optical communication systems. In this paper, slow light generation in SOA using four wave mixing (FWM) effect is analyzed. The dynamic changes of the signal light time delay with the outside controllable parameters, such as the injection current into SOA, the pump light power, the detuning frequency between pump light and signal light, are numerically solved on the basis of the theory of refractive modulation-index and the sub-sections model of SOA. This method has the advantage of accurate simulated results and providing the explicit relationships between the controllable parameters with the signal light time delay for the practical experiment.
In contrast to absorbers, where the delay time via wave mixing saturates to its maximum with increasing device length due to decay of pump power along the device, in semiconductor optical amplifiers (SOAs) the delay time increases with the device length and is limited by the corresponding growth of the SOA gain, which can lead to unacceptable amplified stimulated emission in the SOA. The number of pulses which can be stored in an SOA, defined by the gain and group velocity dispersion, also is given ultimately by this SOA gain limitation, and is estimated between one and two.