Compact 10-channel mode division (de)multiplexer based on collateral asymmetric directional couplers

Zhou, Dongmei; Wang, Aihuan; Wu, Xiaosuo; Ma, Jiao; Yan, Baowan

doi:10.1016/j.ijleo.2021.167588

Optik

2021

DOI: 10.1016/j.ijleo.2021.167588

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Compact 10-channel mode division (de)multiplexer based on collateral asymmetric directional couplers

Dongmei Zhou

Aihuan Wang

Xiaosuo Wu

et al.

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Cited by 4 publications

References 30 publications

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Compact asymmetric directional-coupler-based two-mode optical switch utilizing low loss Sb₂Se₃ phase-change material

Atri¹,

Zarifkar²

2022

J. Opt. Soc. Am. B

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Mode division multiplexing (MDM) has provided a new trend in high capacity optical transmission systems. Some of the most important devices in MDM systems are multimode switches that can route signals simultaneously into different paths. In this work, a two-mode 1 × 2 optical switch based on an asymmetric directional coupler and using Sb2Se3 phase-change material is proposed with a compact size of 45 µ m × 6 µ m . This switch can route the fundamental and first transverse magnetic modes in a wide bandwidth in the third telecommunication window from 1535 to 1565 nm. According to the 3D finite-difference time-domain simulation results, this switch has a low insertion loss of 0.83 dB and cross talk of − 7.93 d B across the bandwidth in the “on” state. In addition, when the switch is off, it has suitable specifications in terms of insertion loss and cross talk with values lower than 0.29 dB and − 11.98 d B across the bandwidth, respectively.

show abstract

Compact asymmetric directional-coupler-based two-mode optical switch utilizing low loss Sb₂Se₃ phase-change material

Atri¹,

Zarifkar²

2022

J. Opt. Soc. Am. B

View full text Add to dashboard Cite

show abstract

Efficient mode (de)multiplexer with two cascaded horizontal polymer waveguide directional couplers

zhang¹,

Deng²,

Huang³

et al. 2022

Opt. Express

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In this paper, we present an efficient polymer two-mode (de)multiplexer with two cascaded horizontal waveguide asymmetric directional couplers (ADCs). Through extensive simulations, the optimized waveguide core dimensions were determined, and the distance L from the starting position of the first ADC to the cascaded position was 35300 µm. With the cascaded ADCs, the E 21 x mode of the wider waveguide was coupled into the E 11 x mode of the narrower waveguide with a coupling ratio of 96.73% at 1550 nm when the separation between the waveguide cores was 5 µm. The coupling ratio and extinction ratio of the fabricated (de)multiplexer reached a maximum of 96.12% and 14.21 dB at 1540 nm, respectively. The coupling ratios were greater than 90% in the wavelength range 1533–1565 nm with a minimum insertion loss of 9.75 dB. The influence of different cascaded positions on the mode coupling ratio, mainly caused by the large phase difference between the modes owing to the slowly varying envelope approximation, is analyzed theoretically and verified experimentally. The proposed cascaded two-mode (de)multiplexer can reduce the preparation process requirements and increase the channel capacity of optical communication systems.

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Compact multichannel reconfigurable mode demultiplexer enabled by phase change material

An,

Ruan,

Gao

et al. 2024

Opt. Mater. Express

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The reconfigurable mode demultiplexer is a crucial component for flexibly routing modes into different channels in on-chip multimode photonic systems with enhanced information processing capabilities. In this paper, we present a multichannel reconfigurable mode demultiplexer enabled by ultralow-loss phase-changing Sb2Se3. By harnessing the phase-change-mediated mode coupling in asymmetric directional couplers (ADCs), one or more of the higher-order modes including TE1, TE2 and TE3 modes could be selectively dropped from the bus waveguide with low losses. With an optimized ADCs structure, the proposed mode demultiplexer demonstrates insertion loss less than 0.227 dB in the ON (amorphous) state and the extinction ratios large than 23.28 dB over the C-band. By coupling the access waveguides of the higher-order mode in parallel on both sides of the bus waveguide, the device size can be compact with a footprint of ∼ 7 × 75 µm2, and this design approach can be further extended to enable more higher-order mode multiplexing.

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Compact 10-channel mode division (de)multiplexer based on collateral asymmetric directional couplers

Cited by 4 publications

References 30 publications

Compact asymmetric directional-coupler-based two-mode optical switch utilizing low loss Sb₂Se₃ phase-change material

Compact asymmetric directional-coupler-based two-mode optical switch utilizing low loss Sb₂Se₃ phase-change material

Efficient mode (de)multiplexer with two cascaded horizontal polymer waveguide directional couplers

Compact multichannel reconfigurable mode demultiplexer enabled by phase change material

Contact Info

Product

Resources

About

Compact 10-channel mode division (de)multiplexer based on collateral asymmetric directional couplers

Cited by 4 publications

References 30 publications

Compact asymmetric directional-coupler-based two-mode optical switch utilizing low loss Sb2Se3 phase-change material

Compact asymmetric directional-coupler-based two-mode optical switch utilizing low loss Sb2Se3 phase-change material

Efficient mode (de)multiplexer with two cascaded horizontal polymer waveguide directional couplers

Compact multichannel reconfigurable mode demultiplexer enabled by phase change material

Contact Info

Product

Resources

About

Compact asymmetric directional-coupler-based two-mode optical switch utilizing low loss Sb₂Se₃ phase-change material

Compact asymmetric directional-coupler-based two-mode optical switch utilizing low loss Sb₂Se₃ phase-change material