An integrated parity-time symmetric wavelength-tunable single-mode microring laser

Liu, Weilin; Li, Ming; Guzzon, Robert S.; Norberg, Erik; Parker, John S.; Lu, Mingzhi; Coldren, L.A.; Yao, Jianping

doi:10.1038/ncomms15389

Cited by 123 publications

(48 citation statements)

References 24 publications

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“…6C) lasers (110). In addition, integrated coupled microring lasers have been demonstrated with single-mode operation at telecommunication wavelengths (111) (Fig. 6D).…”

Section: Applications In Nanophotonicsmentioning

confidence: 98%

Exceptional points in optics and photonics

Miri

Alù

2019

Science

1,687

1,014

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Exceptional points are branch point singularities in the parameter space of a system at which two or more eigenvalues, and their corresponding eigenvectors, coalesce and become degenerate. Such peculiar degeneracies are distinct features of non-Hermitian systems, which do not obey conservation laws because they exchange energy with the surrounding environment. Non-Hermiticity has been of great interest in recent years, particularly in connection with the quantum mechanical notion of parity-time symmetry, after the realization that Hamiltonians satisfying this special symmetry can exhibit entirely real spectra. These concepts have become of particular interest in photonics because optical gain and loss can be integrated and controlled with high resolution in nanoscale structures, realizing an ideal playground for non-Hermitian physics, parity-time symmetry, and exceptional points. As we control dissipation and amplification in a nanophotonic system, the emergence of exceptional point singularities dramatically alters their overall response, leading to a range of exotic optical functionalities associated with abrupt phase transitions in the eigenvalue spectrum. These concepts enable ultrasensitive measurements, superior manipulation of the modal content of multimode lasers, and adiabatic control of topological energy transfer for mode and polarization conversion. Non-Hermitian degeneracies have also been exploited in exotic laser systems, new nonlinear optics schemes, and exotic scattering features in open systems. Here we review the opportunities offered by exceptional point physics in photonics, discuss recent developments in theoretical and experimental research based on photonic exceptional points, and examine future opportunities in this area from basic science to applied technology.

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“…6C) lasers (110). In addition, integrated coupled microring lasers have been demonstrated with single-mode operation at telecommunication wavelengths (111) (Fig. 6D).…”

Section: Applications In Nanophotonicsmentioning

confidence: 98%

Exceptional points in optics and photonics

Miri

Alù

2019

Science

1,687

1,014

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“…To realize compact photonics-based microwave IRMs with high stability, integrated microwave photonic technology can be applied [47][48][49][50][51][52][53][54][55][56][57][58][59][60]. Integrated components including modulators, 90 • optical hybrids, PDs [47][48][49], optical oscillators and circulators [50], integrated sub-systems (such as lasers) [51], microwave photonic spectrum shapers [52], phase shifters [53], delay lines [54], filters [55] and processors [56][57][58][59] have been widely investigated, and great progress has been made. In addition, incorporation of new materials, such as graphene [60], to the field of integrated microwave photonics, brings new advantages, such as fast tuning speed, high nonlinearity and so on.…”

Section: Discussionmentioning

confidence: 99%

Photonics-Based Microwave Image-Reject Mixer

Zhu

Pan

2018

Photonics

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Recent developments in photonics-based microwave image-reject mixers (IRMs) are reviewed with an emphasis on the pre-filtering method, which applies an optical or electrical filter to remove the undesired image, and the phase cancellation method, which is realized by introducing an additional phase to the converted image and cancelling it through coherent combination without phase shift. Applications of photonics-based microwave IRM in electronic warfare, radar systems and satellite payloads are described. The inherent challenges of implementing photonics-based microwave IRM to meet specific requirements of the radio frequency (RF) system are discussed. Developmental trends of the photonics-based microwave IRM are also discussed.

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“…Recently, PT-symmetric lasers were demonstrated experimentally in microrings [6][7][8][9]. Importantly, a single-mode laser operation was achieved in an initially multi-mode system through stronger mode discrimination, when the system operates in the PT-broken regime close to a PT-symmetry-breaking transition.…”

Section: Introductionmentioning

confidence: 99%

Bistable lasing in parity-time symmetric coupled fiber rings

et al. 2018

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We propose a parity-time (PT) symmetric fiber laser composed of two coupled ring cavities with gains and losses, which operates both in PT-symmetric and symmetry-broken regimes depending on the static phase shifts. We perform analytical and numerical analysis by the transfer matrix method taking into account gain saturation and predict laser bistability in the PT-symmetric regime in contrast to a symmetry-broken single-mode operation. In the PT-broken regime, the generation power counterintuitively increases with an increase of the cavity losses.

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An integrated parity-time symmetric wavelength-tunable single-mode microring laser

Cited by 123 publications

References 24 publications

Exceptional points in optics and photonics

Exceptional points in optics and photonics

Photonics-Based Microwave Image-Reject Mixer

Bistable lasing in parity-time symmetric coupled fiber rings

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