Nonconservative Coupling in a Passive Silicon Microring Resonator

Du, Han; Zhang, X.; Littlejohns, Callum G.; Tran, D. T.; Yan, Xingzhao; Banakar, Mehdi; Wei, Ching-Liang; Thomson, David J.; Reed, Graham T.

doi:10.1103/physrevlett.124.013606

Cited by 10 publications

(5 citation statements)

References 29 publications

(34 reference statements)

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“…This opens up possibilities for controlling EP states through various nonlinear optic effects, such as electro-optic, thermo-optic, and piezoelectric effects, offering enhanced feasibility and reliability. For example, the techniques of photonic integrated circuits, in which all the optical components are fabricated on a chip and the coupling strength/phase can be precisely tuned by electronics ( 60 , 61 ), will improve the stability and boost the performance of EP-enhanced sensing.…”

Section: Discussionmentioning

confidence: 99%

Exceptional–point–enhanced phase sensing

Mao,

Fu,

et al. 2024

Sci. Adv.

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Optical sensors, crucial in diverse fields like gravitational wave detection, biomedical imaging, and structural health monitoring, rely on optical phase to convey valuable information. Enhancing sensitivity is important for detecting weak signals. Exceptional points (EPs), identified in non-Hermitian systems, offer great potential for advanced sensors, given their marked response to perturbations. However, strict physical requirements for operating a sensor at EPs limit broader applications. Here, we introduce an EP-enhanced sensing platform featuring plug-in external sensors separated from an EP control unit. EPs are achieved without modifying the sensor, solely through control-unit adjustments. This configuration converts and amplifies optical phase changes into quantifiable spectral features. By separating sensing and control functions, we expand the applicability of EP enhancement to various conventional sensors. As a proof-of-concept, we demonstrate a sixfold reduction in the detection limit of fiber-optic strain sensing using this configuration. This work establishes a universal platform for applying EP enhancement to diverse phase-dependent structures, promising ultrahigh-sensitivity sensing across various applications.

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Section: Discussionmentioning

confidence: 99%

Exceptional–point–enhanced phase sensing

Mao,

Fu,

et al. 2024

Sci. Adv.

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show abstract

“…This opens up possibilities for controlling EP states through various nonlinear optic effects, such as electro-optic, thermo-optic, and piezoelectric effects, offering enhanced feasibility and reliability. For example, the techniques of photonic integrated circuits, in which all the optical components are fabricated on a chip and the coupling strength/phase can be precisely tuned by electronics 47,48 , will improve the stability and boost the performance of EP-enhanced sensing.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Exceptional-point-enhanced phase sensing

Yang

Mao

2023

Preprint

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Optical sensors have become indispensable in various fields, ranging from gravitational wave detection to biomedical imaging and structural health monitoring. Target information is commonly encoded in the phase changes of optical signals. Enhancing the sensitivity to phase changes is crucial for detecting weak signals and extracting valuable data. Recently, exceptional points (EPs), a spectral singularity in non-Hermitian systems, have been explored in various physical systems for sensitivity enhancement. However, it requires precisely controlling the sensor parameters, which restricts the applicability of EP enhancement to certain types of sensors. To overcome this limitation, we propose a novel configuration to implement EP-enhanced sensing. In this approach, a conventional sensor is connected to a microresonator operated at EPs via an optical waveguide. The EP microresonator amplifies optical phase changes from the sensor, converting them into distinct and quantifiable resonance splitting in the transmission spectra of the system. As a proof-of-concept, we demonstrate a six-fold enhancement in the detection limit of fiber-optic strain sensing using this EP-enhanced configuration. By separating the EP control from the sensor to eliminate the need to finely tune the sensor, our configuration enables EP enhancement for a wide range of conventional sensors. This work provides a promising universal platform to apply EP enhancement to diverse phase-dependent structures for ultrahigh-sensitivity sensing in various applications.

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“…The two incident lights are switched from 1 to 1' and from 2 to 2'. Hence, the optical resonator switch behaves as a 2×2 switch [19].…”

Section: A Primary 2×2 Switch and 4×4 Switchesmentioning

confidence: 99%

Bi-Directional Benes With Large Port-Counts and Low Waveguide Crossings for Optical Network-on-Chip

2021

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We propose a new variant of the Benes network using a merge-replace-fold approach. It is to realize a large port-count optical switch with low waveguide crossings. A bidirectional switch is built instead of a unidirectional switch. Compared to the classical Benes, it requires the same number of switches but far fewer intersections. The novel designs enable a 24-percentage reduction in waveguide intersections. Moreover, it has a worst-case insertion loss of 12.01 dB and a comparable crosstalk level of -13.67 dB between the neighbouring paths. Thus, it is suitable for use in high-speed optical networks-on-chip.INDEX TERMS Optical interconnections, Optical NoC, Silicon photonics, Optical resonators, Optical switches.

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Nonconservative Coupling in a Passive Silicon Microring Resonator

Cited by 10 publications

References 29 publications

Exceptional–point–enhanced phase sensing

Exceptional–point–enhanced phase sensing

Exceptional-point-enhanced phase sensing

Bi-Directional Benes With Large Port-Counts and Low Waveguide Crossings for Optical Network-on-Chip

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