Spectral-Distortionless, Flat-Top, Drop-Filter Based on Complementarily-Misaligned Multimode-Waveguide Bragg Gratings

Liang, Xiong; Cheng, Rui; Shen, Xiuqiu; Yu, Ping; Dai, Tingge; Qiu, Huiye

doi:10.1109/jlt.2020.3015602

Cited by 13 publications

(7 citation statements)

References 17 publications

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“…The coupling coefficient ( κ ) is usually used to express the resonance effect, which is the magnitude of coupling between the TE 0 and TE 1 modes here. For the multimode waveguide-based sidewall-modulated grating, the corrugation location will affect its coupling efficiency, and κ can be calculated by [ 33 ]

where κ 0 is the maximum grating coupling coefficient, with Δ P = Λ /2. Here, 2 π Δ P / Λ is the phase shift between two grating regions.…”

Section: Device Design and Principlementioning

confidence: 99%

Sidewall Corrugation-Modulated Phase-Apodized Silicon Grating Filter

Jiang,

Feng,

Yuan

et al. 2024

Micromachines

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In this work, phase-apodized silicon grating filters with varying sidewall corrugation width and location were investigated, while the resonance wavelength, extinction ratio, and rejection bandwidth were tuned flexibly. The grating filters with a waveguide width of 500 nm and grating period of 400 nm were fabricated and characterized as a proof of concept. The resonance wavelength of the device can be shifted by 4.54 nm by varying the sidewall corrugation width from 150 to 250 nm. The corresponding rejection bandwidth can be changed from 1.19 to 2.03 nm by applying a sidewall corrugation location offset from 50 to 200 nm. The experimental performances coincide well with the simulation results. The presented sidewall corrugation-modulated apodized grating can be expected to have great application prospects for optical communications and semiconductor lasers.

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where κ 0 is the maximum grating coupling coefficient, with Δ P = Λ /2. Here, 2 π Δ P / Λ is the phase shift between two grating regions.…”

Section: Device Design and Principlementioning

confidence: 99%

Sidewall Corrugation-Modulated Phase-Apodized Silicon Grating Filter

Jiang,

Feng,

Yuan

et al. 2024

Micromachines

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“…Lateral-misalignment modulation apodization method has a fixed corrugation width, and the feature size remains constant along the entire grating [11]. Moreover, to eliminate additional phase variations caused by traditional lateral-misalignment methods, the complementary lateral-misalignment modulation apodization has been proposed, which modulates both two sub-gratings in a complementary manner [16]. Considering the advantages mentioned above, the complementary lateral-misalignment modulation apodization has been used to convert the coupling coefficients into physical grating structure.…”

Section: Device Designmentioning

confidence: 99%

“…However, the single-mode waveguide grating still cannot overcome the insertion loss of signal separation and the too small feature size. However, multimode waveguide Bragg gratings (MWBGs) can achieve lossless separation of reflected signal and incident signal, the wider multimode waveguide is easy to achieve a smaller coupling coefficient without too small feature size [16,17]. Although many efforts have been done, the LP algorithm suitable for multimode Bragg gratings still needs to be demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Inverse design of the multimode Bragg grating based on time-domain layer peeling method

wang

Ning

et al. 2023

AOPC 2022: Optoelectronics and Nanophotonics

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Multimode waveguide Bragg gratings filters with square shape amplitude responses and well-controlled dispersion characteristics are achieved by the Time-Domain Layer Peeling method for the first time, the Bragg grating structures can be mapped by the complementary lateral-misalignment modulation apodization. Three filters with different amplitude and phase responses are demonstrated. For the dispersion-less filter, the dispersion compensation filter and the three-channel dispersionless filter, the 3 dB bandwidth and the group delay of the realizable spectral responses are 4.0 nm, 4.7 nm, 2.1 nm and 0 ps/nm, 5.7 ps/nm, 0 ps/nm, the group delay ripples have a standard deviation of 1.7 ps, 1.5 ps, and 2.0 ps. The multimode relaxes the fabrication requirement in terms of both the lithography resolution and minimum feature size/spacing while maintaining the advantages of low insertion loss.

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“…In order to make the structure reflect the TE + 0 mode into the TE − 1 mode, the pitch Λ B must be chosen so that the phase matching condition between the modes is met: [14]. Using the MPB software package [15], the pitch of the structure Λ B = 440 nm is calculated to center the phase matching condition at a wavelength of λ = 1550 nm.…”

Section: Polarizer Structure and Designmentioning

confidence: 99%

High performance TM-pass polarizer via subwavelength grating bandgap engineering

Barona-Ruiz,

Pérez-Armenta,

Ortega-Moñux

et al. 2023

2023 IEEE Silicon Photonics Conference (SiPhotonics)

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Silicon photonics systems exhibit a strong birefringence which makes polarization management critical. Here we demonstrate, with full 3D-FDTD simulations, a TM-pass polarizer based on tilted subwavelength gratings that reflects the TE0 mode into the TE1 mode, which can then be easily eliminated. The polarizer achieves TM mode insertion losses below 0.4dB, reflections into the undesired fundamental TE mode of less than -20 dB, and an extinction ratio above 20 dB, over a 150 nm bandwidth around the wavelength of 1550 nm.

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Spectral-Distortionless, Flat-Top, Drop-Filter Based on Complementarily-Misaligned Multimode-Waveguide Bragg Gratings

Cited by 13 publications

References 17 publications

Sidewall Corrugation-Modulated Phase-Apodized Silicon Grating Filter

Sidewall Corrugation-Modulated Phase-Apodized Silicon Grating Filter

Inverse design of the multimode Bragg grating based on time-domain layer peeling method

High performance TM-pass polarizer via subwavelength grating bandgap engineering

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