Tunable optical filter using second-order micro-ring resonator

Deng, Lin; Li, Dezhao; Liu, Zilong; Meng, Yinghao; Guo, Xiaoqian; Tian, Yonghui

doi:10.1088/1674-1056/26/2/024209

Cited by 16 publications

(6 citation statements)

References 41 publications

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“…Optical drop filters are the essential elements in photonic integrated circuits and dense wavelength division multiplexing (WDM) communication systems, since they have been applied as multiplexers, selector, modulators, and so on. Over the past two decades, a variety of investigation on optical drop filtering has been carried out in various systems, including fiber Bragg gratings [1]- [6], photonic crystal structures [7]- [17], plasmonic systems [18] [19], and microresonators [20]- [25], etc. Especially, whispering-gallery mode (WGM) resonators as filter components have attracted much attention owing to their high quality factors and compact sizes [26].…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Two-Channel Drop Filter of Single Photons with One Drop Waveguide

Huang¹,

Feng²

2023

JMP

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A novel double-channel drop filter of single photons with only a drop waveguide is proposed. In the structure, two microresonators with a qubit are used to connect the drop waveguide and the bus waveguide with a reflector. By tuning the system parameters, multiple wavelengths with high drop efficiencies in two output channels of the drop waveguide are obtained. As the reflector is independent on its exact location, and one drop waveguide with two drop channels saves the integrated space, this may suggest a potential filtering device which functions in photonic integrated circuits and dense wavelength division multiplexing communication.

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Section: Introductionmentioning

confidence: 99%

Highly Efficient Two-Channel Drop Filter of Single Photons with One Drop Waveguide

Huang¹,

Feng²

2023

JMP

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“…Optical drop filters are the important components in optical communication systems, as they have been employed as demultiplexers, routers, switches, etc. During the last decade, numerous researches on optical filtering has been performed in various systems, such as Bragg grating systems [1]- [6], photonic crystal structures [7]- [15], plasmonic systems [16] [17], and waveguide coupled microresonator systems [18] [19] [20] [21] [22], and so on. Specifically, whispering-gallery mode resonators as filter elements have drawn much concern due to their microscale sizes and ultra-high quality factors [23].…”

Section: Introductionmentioning

confidence: 99%

Design of Four-Channel Demultiplexer Based on Whispering-Gallery Mode Resonators

Feng¹,

Huang²,

Huang³

2023

JMP

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A new four-channel demultiplexer of single photons is proposed, in which four microresonators are utilized to link the four drop waveguides and the bus waveguide. By adjusting the system parameters, the crosstalk effect of the multiple channel frequencies is suppressed, and multiple peak frequencies with high drop efficiencies in these output ports are achieved. As the 2 × 2 model is scalable, the proposed structure can provide potential applications in designing scalable optical devices.

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“…According to theoretical predictions, the bandwidth tuning range depends on the intrinsic loss of the microresonators, as well as on the coupling losses of two cavities, which may become significant if one of the coupling losses is much larger than the intrinsic losses. We note that similar structures are proposed for the design of optical filters [7,14,15], either demonstrated with a tunable central frequency [14,15] or a tunable bandwidth [7]. However, the analyses used in these works are based on the transfer matrix method and the bandwidth tunability is derived by scanning parameters, without a fundamental explanation.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry

Zhang

Lü

et al. 2022

Micromachines

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A chip-scale tunable optical filter is indispensable to meeting the demand for reconfigurability in wavelength division multiplexing systems, channel routing, and switching, etc. Here, we propose a new scheme of bandwidth tunable band-pass filters based on a parity-time (PT) symmetric coupled microresonator system. Large bandwidth tunability is realized on the basis of the tuning of the relative resonant frequency between coupled rings and by making use of the concept of the exception point (EP) in the PT symmetric systems. Theoretical investigations show that the bandwidth tuning range depends on the intrinsic loss of the microresonators, as well as on the loss contrast between the two cavities. Our proof-of-concept device confirms the tunability and shows a bandwidth tuning range from 21 GHz to 49 GHz, with an extinction ratio larger than 15 dB. The discrepancy between theory and experiment is due to the non-optimized design of the coupling coefficients, as well as to fabrication errors. Our design based on PT symmetry shows a distinct route towards the realization of tunable band-pass filters, providing new ways to explore non-Hermitian light manipulation in conventional integrated devices.

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Tunable optical filter using second-order micro-ring resonator

Cited by 16 publications

References 41 publications

Highly Efficient Two-Channel Drop Filter of Single Photons with One Drop Waveguide

Highly Efficient Two-Channel Drop Filter of Single Photons with One Drop Waveguide

Design of Four-Channel Demultiplexer Based on Whispering-Gallery Mode Resonators

Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry

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