Nonlinearity in Semiconductor Micro‐Ring Lasers

Cai, Xinlun; Yu, Siyuan; Chen, Yujie; Zhang, Yanfeng

doi:10.1002/9783527655342.ch7

Cited by 1 publication

(2 citation statements)

References 41 publications

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“…The ring cavity of the SRLs, featured by a symmetric resonator, supports two counter‐propagating beams, that is, one circulating in clockwise (CW) direction and the other in counter‐clockwise (CCW). Therefore, if unbalanced loss mechanism or non‐reciprocal gain is not intentionally placed depending on the direction of propagation, a strong mode competition between the two counter‐propagating lasing modes was predicted and observed [1–6]. For example, the competition gives rise to kinks in the light versus current characteristic, or, in other words, a bistable behaviour with a directional switching between the two instable unidirectional laser modes [2, 7].…”

Section: Introductionmentioning

confidence: 99%

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Semiconductor racetrack resonator coupled to an S‐bent waveguide: Influence of the coupling coefficients on the unidirectional operation

Giannuzzi

Bardella

2021

IET Optoelectronics

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Semiconductor ring lasers have attracted remarkable interest as laser sources in photonic integrated circuits. They result in bidirectional laser owing to the rotation symmetry between the two counter-propagating modes of the ring cavity. This symmetry can be broken embedding an S-bend waveguide in the racetrack resonator, which generates an unbalanced loss mechanism and a non-reciprocal gain between clockwise and counterclockwise direction beams. The propagating field along the resonator in the undesirable direction is evanescently coupled to the S element in correspondence of two coupling regions and converted into the preferred one. The authors examined how the field coupling coefficients of the couplers impact the resonator unidirectionality. In numerical simulations, the authors changed the coupler gap distance and the coupler length of the directional couplers to scan the full range of variability of the coefficients. The simulated performances of the resonator are discussed in terms of the extinction ratio between the clockwise and the counterclockwise modes as well as the power truly circulated in the two directions of the resonator net of all losses. The finite-difference time-domain method within Synopsys RSoft © suite was used to simulate the evolution of the counterpropagating field along the racetrack. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Introductionmentioning

confidence: 99%

“…Other groups achieved the unidirectional lasing by introducing a feedback mechanism from the cleaved end‐facet mirror [5, 6, 19] outside the ring where the undesirable field was reflected back and re‐coupled in the SRL into the preferred direction. A similar strategy was used in heterogeneous micro‐disk laser [20, 21].…”

Section: Introductionmentioning

confidence: 99%

Semiconductor racetrack resonator coupled to an S‐bent waveguide: Influence of the coupling coefficients on the unidirectional operation

Giannuzzi

Bardella

2021

IET Optoelectronics

View full text Add to dashboard Cite

show abstract

Nonlinearity in Semiconductor Micro‐Ring Lasers

Cited by 1 publication

References 41 publications

Semiconductor racetrack resonator coupled to an S‐bent waveguide: Influence of the coupling coefficients on the unidirectional operation

Semiconductor racetrack resonator coupled to an S‐bent waveguide: Influence of the coupling coefficients on the unidirectional operation

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