Ultra-compact and low loss onchip higher order mode pass filter based on topology optimization

You, Jiangyang; You, Guoqing; Li, Shuyi; Hou, Jin; Yang, Chao; Chen, Shaoping; Gao, Dingshan

doi:10.7567/1882-0786/ab626b

Cited by 13 publications

(4 citation statements)

References 26 publications

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“…Mode blocking filters (MBFs) can be implemented in MDM systems, which filter out the undesired modes after demultiplexing different modes. Stripping the fundamental mode can be achieved by grating waveguides [47], Mach-Zehnder interferometer structures [48], asymmetric directional couplers [49], inversed designed metamaterials [50], L-shaped 3D graphene waveguides [51], and so on. It is straightforward to block a higherorder mode due to its weaker confinement through a tapered waveguide with a cut-off width and an appropriate waveguide bend.…”

Section: Mode Blocking Filtermentioning

confidence: 99%

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Zhu,

Deng,

Chen

et al. 2023

Photonics

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Three ultracompact integrated photonic devices are proposed, assisted by etched structures. A mode-order converter (MOC) is achieved with a footprint of 0.85 × 1.4 μm2, which exhibits high performances with insertion loss (IL) below 0.34 dB and mode purity (MP) above 90% within 100 nm waveband. Moreover, a mode blocking filter (MBF) is proposed based on a subwavelength grating with a footprint of 0.8 × 4.12 μm2, which allows the propagation of TM0 mode but blocks the TM1 mode with a remarkably high extinction ratio of 31.6 dB at the wavelength of 1550 nm. Finally, a compact reciprocal optical diode (ROD) is presented by cascading the abovementioned MOC and MBF with a footprint of 0.85 × 5.9 μm2. This ROD enables one-way transmissions for both TM0 mode and TM1 mode with contrast ratios of 19.74 dB and 32.04 dB, respectively. The design methodology paves a new way for mode manipulation in integrated multimode photonic circuits.

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Section: Mode Blocking Filtermentioning

confidence: 99%

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Zhu,

Deng,

Chen

et al. 2023

Photonics

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“…In recent years, integrable mode-division multiplexing (MDM) systems have attracted increasing attention due to their great potential in further improving the transmission capacity of on-chip optical interconnection [1,2] . To assemble a complete MDM system, various key building elements have been proposed, such as mode (de)multiplexers [(De)MUXers] [3,4] , mode filters [5,6] , mode converters [7,8] , and multimode bendings [9,10] . In addition to these multimode devices, the mode splitter is a crucial component that straightforwardly separates modes of different orders into different channels.…”

Section: Introductionmentioning

confidence: 99%

Inverse design of highly efficient and broadband mode splitter on SOI platform

Liao,

Tian,

Yang

et al. 2024

中国光学快报

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Mode splitters that directly separate modes without changing their orders are highly promising to improve the flexibility of the mode-division multiplexing systems. In this paper, we design a high-performance mode splitter on the silicon-oninsulator platform with a compact footprint of 14 μm× 2.5 μm using an inverse design method based on shape optimization. The fabrication of this mode splitter requires only a single lithography step and exhibits good fabrication tolerances. The experimental results show that the proposed device exhibits state-of-the-art insertion loss (<0.9 dB) and cross talk (<−16 dB) over a broad bandwidth (1500-1600 nm). Furthermore, the shape optimization method used is implemented to design a dual-mode (de)multiplexer, and the experimental results fulfill the design objective, demonstrating the excellent generality of the design method in this paper.

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“…In on-chip MDM system, multimode optical filters passing the desired modes and filtering the unwanted modes also perform an important role. Previously, silicon multimode optical filters employing a variety of configurations, for example, multimode interference coupler and a Y-junction [16], 1D photonic crystal silicon waveguide [17], asymmetric directional coupler [18], a subwavelength grating-based contra-directional coupler [19], backward mode conversion gratings [20], and photonic crystal and tapered coupler [21], have been experimentally demonstrated. But these reported silicon multimode optical filters mainly focus on the high-order mode pass filter in which the highest order mode is filtered out and the remaining modes pass through or the mode blocking filter in which the middle order mode is blocked while other modes keep moving forward.…”

Section: Introductionmentioning

confidence: 99%

Ultra-compact and low-insertion-loss silicon modal bandpass filter using a pixelated region

Chen,

Liu,

Wang

et al. 2024

J. Opt.

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In this paper, a silicon modal bandpass filter using a pixelated region, in which the TE1 mode passes through while TE0 and TE2 modes are blocked, is proposed, optimized, and experimentally demonstrated. To achieve low insertion loss, ultra-compact footprint, relatively broad bandwidth and large extinction ratio, the direct-binary-search optimization algorithm and finite difference time domain method are employed to optimize the design of the pixelated region. Measurement results reveal that, for the fabricated filter, an extinction ratio of 16.91 dB and an insertion loss of 0.89 dB are realized at 1550 nm. The measured extinction ratio is larger than 16.03 dB and the insertion loss is lower than 1.04 dB from 1538.5 to 1584.5 nm. Additionally, the length of the pixelated region is only 4.8 μm.

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Ultra-compact and low loss onchip higher order mode pass filter based on topology optimization

Cited by 13 publications

References 26 publications

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Inverse design of highly efficient and broadband mode splitter on SOI platform

Ultra-compact and low-insertion-loss silicon modal bandpass filter using a pixelated region

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