Adiabatic Coupler With Design-Intended Splitting Ratio

Deng, Mao; Alam, Samiul; Zhang, Jinsong; Zhu, Mingyue; Koh, Ping-Chiek; Plant, David V.; Wang, Yun; El-Fiky, Eslam; Xu, Luhua; Kumar, Amar; Jaques, Maxime; Samani, Alireza; Carpentier, Olivier; Bernal, Santiago

doi:10.1109/jlt.2019.2946948

Cited by 40 publications

(11 citation statements)

References 30 publications

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“…Although the bandwidth is limited, the reflectivity stays within ±1% in a range of 7.0 nm. Further engineering for adiabatic couplers which are wavelength insensitive can increase the bandwidth if required [45].…”

Section: Appendix B Directional Coupler Simulationsmentioning

confidence: 99%

On-chip tunable quantum interference in a lithium niobate-on-insulator photonic integrated circuit

Maeder,

Finco,

Kaufmann

et al. 2024

Quantum Sci. Technol.

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Programmable interferometric circuits are at the heart of integrated quantum photonic processors. While the lithium niobate-on-insulator platform has the potential to advance integrated quantum photonics due to its strong nonlinearity and tight mode confinement, the demonstration of reconfigurable two-photon interference has not yet been achieved. Here, we design, fabricate and characterize the building block of such interferometric networks in the form of a 2x2 Mach-Zehnder Interferometer. We use a thermo-optic phase shifter to achieve stable performance with a power consumption of Pπ = 44.4 mW and sub-microsecond switching times. We demonstrate the effectiveness of our device for quantum applications by measuring single-photon routing with up to 34 dB extinction ratio. We show Hong-Ou-Mandel interference with fully tunable visibilities reaching a maximum value of 97.4 ± 1.0 %. As part of large scale quantum photonic circuits, this building block will facilitate reconfigurable and tunable photonic processing units integrated alongside non-classical light sources.

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Section: Appendix B Directional Coupler Simulationsmentioning

confidence: 99%

On-chip tunable quantum interference in a lithium niobate-on-insulator photonic integrated circuit

Maeder,

Finco,

Kaufmann

et al. 2024

Quantum Sci. Technol.

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“…Although the results are satisfactory, the fabrication process is challenging in this way. Authors in 38 , 39 have investigated directional couplers on a silicon platform based on coupled-mode theory. Although they can be used in mm-wave frequencies however they have weak coupling and there are no phase difference that limit their application.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of ultra-wideband PRGW hybrid coupler using PEC/PMC waveguide model

Mousavirazi

Ali

Gheisanab

et al. 2022

Sci Rep

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In this paper, a new method to facilitate the design of Printed Ridge Gap Waveguide (PRGW) structures is introduced. One of the main difficulties in designing such structures is related to their simulation process which is really time and energy-consuming. Therefore, a suitable boundary condition is considered to bring about the primary structure without involving the bed of nails or mushroom unit cells. Using this technique, a wideband PRGW 3 dB hybrid double-box coupler is designed to serve in mm-wave frequencies at a center frequency of 30 GHz, which can be deployed for the next generation of mobile communication. The designed coupler provides a wide matching and isolation bandwidth with low output amplitude imbalance, which is unique in comparison with current couplers. The prototype of the proposed coupler is fabricated and measured where the simulation and measurement results show a good agreement indicating the strength of the proposed method in PRGW structure design as well. The measured results show the couplers achieve better than 10-dB return loss and isolation over the frequency range from 25 to 40 GHz (46% BW) with the power-split unbalance and phase error within ± 1 dB and ± 5°, respectively. In addition, square mushrooms are chosen here to satisfy the high impedance surface. Not only do they bring about larger stop bandwidth, but also their configuration facilitates the arrangement of them around the coupler. The proposed design has superb characteristics such as low profile, low loss, and easy integration with microwave circuits and systems that can be suitable for designing mm-wave beamforming networks.

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“…Compact and low-loss splitters are critical in photonics circuits since they are frequently used in light distribution or as component to build devices such as optical switches [6], multiplexers [7], or modulators [8]. Recently, optical 3-dB power splitters with enhanced performance have been demonstrated using Y-junctions [9,10], directional couplers (DC) [11][12][13], adiabatic couplers [14][15][16][17][18] and multimode interference (MMI) couplers [19][20][21][22][23][24][25]. Nevertheless, these approaches still face a number of limitations.…”

Section: Introductionmentioning

confidence: 99%

A Compact Low-Loss Broadband Polarization Independent Silicon 50/50 Splitter

Nair

Ménard

2021

IEEE Photonics J.

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We present a low-loss, compact, polarization insensitive 3-dB optical power-splitter for submicron silicon waveguides. The splitter is optimized over a broad wavelength span ranging from 1300 to 1700 nm through finite difference time domain simulations. The splitter junction footprint is only 1.8 x 1.3 µm, which is smaller than previously reported broadband multimode junction splitters. Furthermore, the demonstrated device overcomes the fabrication limitations of previous splitters while maintaining a compact size without any sharp angles. The device was fabricated using electron beam lithography. The experimental results show a small insertion loss of less than 0.3 dB for both the TE and TM polarizations.

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Adiabatic Coupler With Design-Intended Splitting Ratio

Cited by 40 publications

References 30 publications

On-chip tunable quantum interference in a lithium niobate-on-insulator photonic integrated circuit

On-chip tunable quantum interference in a lithium niobate-on-insulator photonic integrated circuit

Analysis and design of ultra-wideband PRGW hybrid coupler using PEC/PMC waveguide model

A Compact Low-Loss Broadband Polarization Independent Silicon 50/50 Splitter

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