scholarly journals Parity–Time Symmetry in Bidirectionally Coupled Semiconductor Lasers

Photonics ◽  
2019 ◽  
Vol 6 (4) ◽  
pp. 122 ◽  
Author(s):  
Andrew Wilkey ◽  
Joseph Suelzer ◽  
Yogesh Joglekar ◽  
Gautam Vemuri
Keyword(s):  
Semiconductor Lasers ◽  
Electric Fields ◽  
Single Mode ◽  
Equation Model ◽  
Rate Equations ◽  
Symmetric System ◽  
Time Symmetry ◽  
Complicating Factors ◽  
Future Work ◽  
Coupled Semiconductor

We report on the numerical analysis of intensity dynamics of a pair of mutually coupled, single-mode semiconductor lasers that are operated in a configuration that leads to features reminiscent of parity–time symmetry. Starting from the rate equations for the intracavity electric fields of the two lasers and the rate equations for carrier inversions, we show how these equations reduce to a simple 2 × 2 effective Hamiltonian that is identical to that of a typical parity–time (PT)-symmetric dimer. After establishing that a pair of coupled semiconductor lasers could be PT-symmetric, we solve the full set of rate equations and show that despite complicating factors like gain saturation and nonlinearities, the rate equation model predicts intensity dynamics that are akin to those in a PT-symmetric system. The article describes some of the advantages of using semiconductor lasers to realize a PT-symmetric system and concludes with some possible directions for future work on this system.

Single‐mode very wide tunability in laterally coupled semiconductor lasers with electrically controlled reflectivities

1991 ◽  
Vol 58 (17) ◽  
pp. 1827-1829 ◽  
Author(s):  
Giora Griffel ◽  
Howard Z. Chen ◽  
Ilan Gravé ◽  
Amnon Yariv
Keyword(s):  
Semiconductor Lasers ◽  
Single Mode ◽  
Coupled Semiconductor

scholarly journals Parity-time symmetry breaking in optically coupled semiconductor lasers

2016 ◽  
Author(s):  
Joseph S. Suelzer ◽  
Yogesh N. Joglekar ◽  
Gautam Vemuri
Keyword(s):  
Symmetry Breaking ◽  
Semiconductor Lasers ◽  
Time Symmetry ◽  
Coupled Semiconductor

scholarly journals Effects of Asymmetric Coupling Strength on Nonlinear Dynamics of Two Mutually Long-Delay-Coupled Semiconductor Lasers

Photonics ◽  
2022 ◽  
Vol 9 (1) ◽  
pp. 28
Author(s):  
Bin-Kai Liao ◽  
Chin-Hao Tseng ◽  
Yu-Chen Chu ◽  
Sheng-Kwang Hwang
Keyword(s):  
Nonlinear Dynamics ◽  
Semiconductor Lasers ◽  
Coupling Strength ◽  
Spectral Features ◽  
Time Symmetry ◽  
Numerical Predictions ◽  
Dynamical Behaviors ◽  
Asymmetric Coupling ◽  
High Asymmetry ◽  
Coupled Semiconductor

This study investigates the effects of asymmetric coupling strength on nonlinear dynamics of two mutually long-delay-coupled semiconductor lasers through both experimental and numerical efforts. Dynamical maps and spectral features of dynamical states are analyzed as a function of the coupling strength and detuning frequency for a fixed coupling delay time. Symmetry in the coupling strength of the two lasers, in general, symmetrizes their dynamical behaviors and the corresponding spectral features. Slight to moderate asymmetry in the coupling strength moderately changes their dynamical behaviors from the ones when the coupling strength is symmetric, but does not break the symmetry of their dynamical behaviors and the corresponding spectral features. High asymmetry in the coupling strength not only strongly changes their dynamical behaviors from the ones when the coupling strength is symmetric, but also breaks the symmetry of their dynamical behaviors and the corresponding spectral features. Evolution of the dynamical behaviors from symmetry to asymmetry between the two lasers is identified. Experimental observations and numerical predictions agree not only qualitatively to a high extent but also quantitatively to a moderate extent.

The Theory and Experimental Study on the Long-External Cavity Semiconductor Lasers

2014 ◽  
Vol 571-572 ◽  
pp. 990-993
Author(s):  
Chang Jian Qi ◽  
Tong Gang Zhao
Keyword(s):  
Semiconductor Lasers ◽  
External Cavity ◽  
Single Mode ◽  
Response Characteristic ◽  
Theory Model ◽  
Rate Equations ◽  
External Cavity Laser ◽  
High Frequency Response ◽  
External Cavity Semiconductor Lasers ◽  
Promising Type

Long-External Cavity Laser (L-ECL) is a kind of new and promising type laser because of its dynamic single mode performance. In this paper, firstly, the theory model of L-ECL is discussed; Secondly, the influence of coupling coefficient on the threshold gain of L-ECL is studied based on equivalent external cavity theory; Thirdly, utilizing the theory of equivalent cavity length, combined rate equations, the high frequency response characteristic of L-ECL is analyzed; Lastly, optical spectrums of L-ECL on different grating peak reflectivity are obtained by experiment.

Transient multimode statistics in almost single-mode semiconductor lasers

1993 ◽  
Vol 140 (4) ◽  
pp. 237 ◽  
Author(s):  
A. Valle ◽  
P. Colet ◽  
L. Pesquera ◽  
M.San Miguel
Keyword(s):  
Semiconductor Lasers ◽  
Single Mode

scholarly journals Observation of anti-parity-time-symmetry, phase transitions and exceptional points in an optical fibre

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Arik Bergman ◽  
Robert Duggan ◽  
Kavita Sharma ◽  
Moshe Tur ◽  
Avi Zadok ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Brillouin Scattering ◽  
Optical Gain ◽  
Single Mode ◽  
Exceptional Point ◽  
Small Scale ◽  
Time Symmetry ◽  
Topological Features ◽  
Gain And Loss ◽  
Exotic Physics

AbstractThe exotic physics emerging in non-Hermitian systems with balanced distributions of gain and loss has recently drawn a great deal of attention. These systems exhibit phase transitions and exceptional point singularities in their spectra, at which eigen-values and eigen-modes coalesce and the overall dimensionality is reduced. So far, these principles have been implemented at the expense of precise fabrication and tuning requirements, involving tailored nano-structured devices with controlled optical gain and loss. In this work, anti-parity-time symmetric phase transitions and exceptional point singularities are demonstrated in a single strand of single-mode telecommunication fibre, using a setup consisting of off-the-shelf components. Two propagating signals are amplified and coupled through stimulated Brillouin scattering, enabling exquisite control over the interaction-governing non-Hermitian parameters. Singular response to small-scale variations and topological features arising around the exceptional point are experimentally demonstrated with large precision, enabling robustly enhanced response to changes in Brillouin frequency shift.

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