Universal Design of Ultra-Broadband and Ultra-Compact High Order Mode Pass Filters Based on Enhanced Absorption in Ultrathin Metal Layers

To improve the flexibility of the mode division multiplexing (MDM) system, we propose and experimentally demonstrate a mode splitter by using the inverse design method. The proposed mode splitter has an ultra-compact footprint of 5 × 3 µm2, and the functional region occupies a footprint of only 5 × 1 µm2. The optimized mode splitter can separate the TE0 and TE1 modes without changing the mode order. When transmitting the TE0 mode, the measured insertion loss and crosstalk are 2.14 dB and −13.34 dB, respectively, at the operating wavelength of 1550 nm. The 3-dB bandwidth is >66 nm, and the crosstalk is lower than −12.37 dB over the C + L band. When transmitting the TE1 mode, the insertion loss and crosstalk are 3.04 dB and −16 dB, respectively, at 1550 nm. The 3-dB bandwidth is >57 nm, and the crosstalk is below −12.89 dB over the whole C + L band.

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Optimal design and experimental demonstration of a silicon-based ultra-compact mode splitter

Mao

Zhang

et al. 2022

Opt. Lett.

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Efficient mode converters and filters using asymmetrical directional couplers with subwavelength gratings

Chen¹,

Shi²,

Qiu³

et al. 2022

Opt. Lett.

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Mode-division multiplexing (MDM) is a promising solution to improve data transmission capacity for future optical interconnect networks. Mode converters and mode filters play a key role in on-chip MDM systems. Here, we propose and experimentally demonstrate a device, enabling mode conversion and filtering simultaneously, which is composed of asymmetrical directional couplers with subwavelength gratings, in a small footprint of 14.7 µm × 1.42 µm. The device can realize optical mode conversion between the first-order transverse electric (TE) mode and the fundamental TE mode, and can also filter the fundamental TE mode efficiently. The conversion efficiency is over 95%, with a broad 1 dB bandwidth over 80 nm and a high mode extinction ratio of >29 dB. As a mode filter, strong mode elimination of >30 dB is achieved.

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Experimental demonstration of higher order-mode pass filter based on mode-scattering evolution

Jiang,

Mao,

2024

Opt. Lett.

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A higher-order mode (HOM) pass filter is a key component in on-chip mode-division multiplexing (MDM) systems, enabling mode-selective transmission. In this study, a highly integrated silicon-based HOM pass filter is proposed based on “mode-scattering evolution.” The proposed filter consists of a functional region and input/output waveguides, with a compact footprint of only 2 µm × 9 µm achieved through an inverse design. Experimental results demonstrate that the fabricated silicon-based HOM pass filter exhibits an insertion loss of 2.11 dB and a crosstalk of −10.63 dB at 1550 nm. The bandwidth with a loss <5 dB is measured to be 90 nm. The proposed device offers an efficient solution for on-chip mode-selective filtering, which can provide a promising technology for building integrated MDM systems.

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Universal Design of Ultra-Broadband and Ultra-Compact High Order Mode Pass Filters Based on Enhanced Absorption in Ultrathin Metal Layers

Cited by 3 publications

References 32 publications

Optimal design and experimental demonstration of a silicon-based ultra-compact mode splitter

Optimal design and experimental demonstration of a silicon-based ultra-compact mode splitter

Efficient mode converters and filters using asymmetrical directional couplers with subwavelength gratings

Experimental demonstration of higher order-mode pass filter based on mode-scattering evolution

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