Analysis of regular polygonal ring resonator based on multi-mode waveguide

Kim, Sun-Ho; Kim, Dohyun; Jeon, Su-Jin; Kim, Eudum; Lee, Jae-Sang; Choi, Young‐Wan

doi:10.1117/12.2506586

Cited by 2 publications

(2 citation statements)

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“…Similar ring resonators designed as polygons had been studied by other authors who consider its featuring parameters like quality factor, free spectral range (FSR), contrast ratio and so on [9]. However, these papers did not emphasise how the software tools work in detail, influencing the final design.…”

Section: Introductionmentioning

confidence: 99%

Design conditions in the middle range for implementation of integrated ring resonators in LiNbO ₃ by direct laser writing

Pagano

Presti

Peyton

et al. 2020

IET Optoelectronics

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The aim of this work is to design an integrated optical ring resonator to be implemented in LiNbO3 with a 2.5 mm radius and an operating wavelength of 1550 nm. Considering these ring parameters, a free spectral range of 71.54 pm and a quality factor of ∼5×105 were calculated. The authors apply results to improve the implementation of femtosecond laser writing in lithium niobate crystals. As it is well‐known finite difference time domain method requires large memory and time for processing circuits with large footprint (few square mm), in contrast, the beam propagation method allows to simulate large bends in a simple way. RSoft suite design tools commonly represent circles by closed polygons whose geometrical parameters are not optimised to obtain bending losses as least as possible, as suggested by coherent coupling theory. In this sense, the suitable determination of a splice angle (in this case 1.44°), shape and length for segments are key parameters in the ring design. For this purpose, an ad hoc software was implemented to overcome this drawback. In summary, a 250 sided polygon side showed a suitable coupling performance and established a new layout approach for middle range rings.

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Section: Introductionmentioning

confidence: 99%

Design conditions in the middle range for implementation of integrated ring resonators in LiNbO ₃ by direct laser writing

Pagano

Presti

Peyton

et al. 2020

IET Optoelectronics

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“…Among optical devices, ring resonators such as liquid core optical ring resonators, split ring resonators, and planar ring resonators have been studied in biological and chemical sensing, because these have considerably high Q-factors and steep slopes [8,9,10,11]. Single-mode waveguides have generally been utilized in ring resonators, as they have the advantages of a low propagation loss, small size, and low modal dispersion [12,13]. However, a relatively high-cost fabrication process must be employed, and mass production is difficult as single-mode waveguides typically have widths of several hundred nanometers.…”

Section: Introductionmentioning

confidence: 99%

Novel S-Bend Resonator Based on a Multi-Mode Waveguide with Mode Discrimination for a Refractive Index Sensor

Kim

Jeon

Lee

et al. 2019

Sensors

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In this paper, a multi-mode waveguide-based optical resonator is proposed for an integrated optical refractive index sensor. Conventional optical resonators have been studied for single-mode waveguide-based resonators to enhance the performance, but mass production is limited owing to the high fabrication costs of nano-scale structures. To overcome this problem, we designed an S-bend resonator based on a micro-scale multi-mode waveguide. In general, multi-mode waveguides cannot be utilized as optical resonators, because of a performance degradation resulting from modal dispersion and an output transmission with multi-peaks. Therefore, we exploited the mode discrimination phenomenon using the bending loss, and the resulting S-bend resonator yielded an output transmission without multi-peaks. This phenomenon is utilized to remove higher-order modes efficiently using the difference in the effective refractive index between the higher-order and fundamental modes. As a result, the resonator achieved a Q-factor and sensitivity of 2.3 × 103 and 52 nm/RIU, respectively, using the variational finite-difference time-domain method. These results show that the multi-mode waveguide-based S-bend resonator with a wide line width can be utilized as a refractive index sensor.

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Analysis of regular polygonal ring resonator based on multi-mode waveguide

Cited by 2 publications

References 11 publications

Design conditions in the middle range for implementation of integrated ring resonators in LiNbO ₃ by direct laser writing

Design conditions in the middle range for implementation of integrated ring resonators in LiNbO ₃ by direct laser writing

Novel S-Bend Resonator Based on a Multi-Mode Waveguide with Mode Discrimination for a Refractive Index Sensor

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Analysis of regular polygonal ring resonator based on multi-mode waveguide

Cited by 2 publications

References 11 publications

Design conditions in the middle range for implementation of integrated ring resonators in LiNbO 3 by direct laser writing

Design conditions in the middle range for implementation of integrated ring resonators in LiNbO 3 by direct laser writing

Novel S-Bend Resonator Based on a Multi-Mode Waveguide with Mode Discrimination for a Refractive Index Sensor

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Product

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Design conditions in the middle range for implementation of integrated ring resonators in LiNbO ₃ by direct laser writing

Design conditions in the middle range for implementation of integrated ring resonators in LiNbO ₃ by direct laser writing