Polarization insensitive silicon waveguide wavelength filter using polarization rotator and mode conversion Bragg grating with resonator cavity

Okayama, Hideaki; Onawa, Yosuke; Takahashi, Hiroyuki; Shimura, Daisuke; Yaegashi, Hiroki; Sasaki, Hirokazu

doi:10.35848/1347-4065/abca4f

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…Figure 3 shows the calculated mode CE and CT of the proposed TM 0 -to-TM 3 mode-order converter as functions of the length L 3 (L 6 ), width W 3 (W 6 ), and relative distance W s (W m ) of slot 3 (6). Note that for the mode-order converter, high mode CE was a paramount evaluation index which reflected well its pivotal mode conversion performance [11][12][13][14][15][19][20][21][22]. Meanwhile, we also employed CT between the required mode (TM 3 mode) and other modes at the output port to characterize the mode purity for the mode conversion process.…”

Section: Resultsmentioning

confidence: 95%

“…Some prevailing optimization methods (e.g., deep learning and topology optimization [16][17][18]) have also been used to find the optimal structure pattern at the cost of quite time-consuming iterative calculations and complex patterns for the device fabrication. Compared with these latest reports, some classical structures such as Mach−Zehnder interferometers (MZI) [19,20] and Bragg gratings [21,22] are still employed to realize the mode-order conversion due to their simple structures, high performance and clear working mechanisms. However, the main issue of these typical schemes are their device lengths (>50 µm).…”

Section: Introductionmentioning

confidence: 99%

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Silicon-Based TM0-to-TM3 Mode-Order Converter Using On-Chip Shallowly Etched Slot Metasurface

Zhu

Kang

et al. 2021

Photonics

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Mode-order converters drive the on-chip applications of multimode silicon photonics. Here, we propose a TM0-to-TM3 mode-order converter by leveraging a shallowly etched slot metasurface pattern atop the silicon waveguide, rather than as some previously reported TE-polarized ones. With a shallowly etched pattern on the silicon waveguide, the whole waveguide refractive index distribution and the corresponding field evolution will be changed. Through further analyses, we have found the required slot metasurface pattern for generating the TM3 mode with high conversion efficiency of 92.9% and low modal crosstalk <−19 dB in a length of 17.73 μm. Moreover, the device’s working bandwidth and the fabrication tolerance of the key structural parameters are analyzed in detail. With these features, such devices would be beneficial for the on-chip multimode applications such as mode-division multiplexing transmission.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Silicon-Based TM0-to-TM3 Mode-Order Converter Using On-Chip Shallowly Etched Slot Metasurface

Zhu

Kang

et al. 2021

Photonics

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“…Geometric Parameters Waveguide width (W) 500 nm Waveguide height 220 nm Period (Λ) 400 nm The working principle of the grating can be explained by the coupled mode theory [30]. For the multi-mode waveguide, if the excited TE 0 mode in the strip waveguide meets the phase-matching condition, the grating will reversely couple it to the backward TE 1 mode.…”

Section: Grating Parametersmentioning

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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“…Most of them, follow the interference principle, such as the Mach-Zehnder interferometer, and fiber Bragg grating filter are used to achieve a bandwidth of hundreds of megahertz. [5][6][7][8] While other techniques, such as ultrahigh-Q-cavity narrow-band filter and acousto-optic tunable optical filter have also been proposed, 9,10) but with limited the free spectral range (FSR) only be applied in a certain experimental occasion. These existing techniques are still difficult to meet the coverage of the tunable monochromatic light source from infrared to ultraviolet.…”

mentioning

confidence: 99%

Tunable plasma narrow-band filter for ultrafast high-power lasers

Zhang

Zhu

Xie

et al. 2021

Appl. Phys. Express

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We proposed a technique of tunable plasma narrow-band filter (PNBF) to generate high-power narrow-band pulses based on a plasma mirror and pulse chirp. PNBFs have an ultra-wide free spectral range, high damage threshold, and accurate wavelength-tunable function, and tunable sub-nanometer pulses could be achieved by controlling the pulse chirp. The feasibility of the proposed technique was verified by both simulation and experiment. Three ∼0.6 nm bandwidth pulses centered at different wavelengths were obtained respectively, maintaining good near and far-field beam quality. PNBF is expected to be an effective technique for high-power tunable narrow-band pulse generation with high-power ultrafast lasers.

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Polarization insensitive silicon waveguide wavelength filter using polarization rotator and mode conversion Bragg grating with resonator cavity

Cited by 5 publications

References 24 publications

Silicon-Based TM0-to-TM3 Mode-Order Converter Using On-Chip Shallowly Etched Slot Metasurface

Silicon-Based TM0-to-TM3 Mode-Order Converter Using On-Chip Shallowly Etched Slot Metasurface

Sidewall Corrugation-Modulated Phase-Apodized Silicon Grating Filter

Tunable plasma narrow-band filter for ultrafast high-power lasers

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