Ultra-compact, flat-top demultiplexer using anti-reflection contra-directional couplers for CWDM networks on silicon

Shi, Wei; Yun, Han; Lin, Cheng-Ju; Greenberg, Mark; Wang, Xu; Wang, Yun; Fard, Sahba Talebi; Flueckiger, Jonas; Jaeger, Nicolas A. F.; Chrostowski, Lukas

doi:10.1364/oe.21.006733

Cited by 138 publications

(52 citation statements)

References 13 publications

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“…Depending on the fabrication processes and applications, various grating couplers are required. [1][2][3][4][5] The thicknesses of the functional silicon layers are different for silicon-on-insuator (SOI) wafers provided by various foundries. 1,2,6,7 These various wafers require wafer-specific grating couplers.…”

Section: Introductionmentioning

confidence: 99%

“…Grating couplers with various central wavelengths are required in multi-channel circuits, such as coarse wavelength-division multiplexing circuits. 4 Grating couplers for quasi-TE modes and quasi-TM modes are required for various applications. 1,8 The traditional way of designing grating couplers involves exhaustive, brute-force simulations on all of the design parameters, such as the grating period and fill factor, which can be very time-consuming and computationally intensive.…”

Section: Introductionmentioning

confidence: 99%

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Universal grating coupler design

Wang

Flueckiger

Lin

et al. 2013

Photonics North 2013

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A universal design methodology for grating couplers based on the silicon-on-insulator platform is presented in this paper. Our design methodology accommodates various etch depths, silicon thicknesses (e.g., 220 nm, 300 nm), incident angles, and cladding materials (e.g., silicon oxide or air), and has been verified by simulations and measurement results. Further more, the design methodology presented can be applied to a wide range, from 1260 nm to 1675 nm, of wavelengths.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Universal grating coupler design

Wang

Flueckiger

Lin

et al. 2013

Photonics North 2013

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“…The grating is defined by a few parameters: pitch of the Bragg grating, Ʌ = λ/(2×n eff ), filling factor, ff = a/Ʌ, height of teeth, h, with a being the width of a tooth (Figure 1(c)). By choosing proper parameters, one could efficiently suppress a spectral component in the transmitted spectra, or even tune up the reflectivity for that component [3]. With increase of Ʌ or ff, wavelength of the spectral component is also increased, and increase of h affects the efficiency and controls the width of the notch.…”

Section: Device Design and Fabricationmentioning

confidence: 99%

Integrated Bragg waveguides as an efficient optical notch filter on silicon nitride platform

Zubkova

Kovalyuk

et al. 2017

J. Phys.: Conf. Ser.

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View the article online for updates and enhancements. Abstract. We modeled and fabricated integrated optical Bragg waveguides on a silicon nitride (Si 3 N 4 ) platform. These waveguides would serve as efficient notch-filters with the desired characteristics. Transmission spectra of the fabricated integrated notch filters have been measured and attenuation at the desired wavelength of 1550 nm down to -43 dB was observed. Performance of the filters has been studied depending on different parameters, such as pitch, filling factor, and height of teeth of the Bragg grating. IntroductionContinuous development of micro-and optoelectronics is inevitably connected with a substantial decrease of the planar structure dimensions. State-of-the-art nanotechnology allows creation of complex nanophotonic circuits with a high performance and a compact design on chip, which currently are replacing free-space optical schemes build up on the optical tables. Integrated on chip circuits have a number of advantages, such as low optical losses, no need for optical alignment, insensitivity to vibrations, small size, weight, and power consumption, but the most important is their scalability [1]. This allows development of quantum-optics integrated circuits (QPICs), which would be beneficial for quantum cryptography in the quantum key distribution systems, quantum simulations of complicated molecules, and quantum computing development increasing the data processing and computation rate gradually. One of the key prerequisites for the QPICs development is the on-chip implementation of a highly efficient single-photon source. Silicon nitride (Si 3 N 4 ) is a promising material for nanophotonic circuits, which combine good mechanical properties, low optical absorption in the infrared (IR) and visible wavelength ranges as well as possibility for creation of single photon sources integrated into the nanophotonic circuit. One possible realization of the single-photon source is the four-wave mixing [2]. One of the main problem for such sources is an efficient pump power rejection down to -120 dB. Here, we have numerically simulated and fabricated nanophotonic waveguides with the Bragg grating of different geometrical configurations on silicon nitride platform. Such waveguides can be effectively used as notch-filters integrated into the nanophotonic circuit for the pump power suppression. For the fabricated structures, we have studied their transmission properties and the power suppression efficiency at the desired wavelength depending on the Bragg grating parameters. Data analysis demonstrates reasonable agreement between the measured and simulated characteristics.

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“…This is accomplished by placing two different gratings on each side of the waveguide. If the gratings are phase shifted by 180 • , complete cancellation of Bragg back-reflections is achieved [29].…”

Section: G Fdtd Simulation Of Bmdm For Examplementioning

confidence: 99%

Bi-Directional Coupler as a Mode-Division Multiplexer/Demultiplexer

Shalaby

2016

J. Lightwave Technol.

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A bi-directional coupler supported with Bragg grating is proposed as a mode-division multiplexer/demultiplexer. The structure can demultiplex 3 modes with only two waveguides and a Bragg grating. The input waveguide is multimode, while the output waveguide is single-mode. Both first-and second order modes of the input waveguide are coupled to the output waveguide, propagating at opposite directions, while the fundamental mode is kept in the input waveguide. A theoretical analysis of the proposed demultiplexer is developed based on the perturbative mode-coupled theory. The insertion losses of both first-and second order modes are derived under suitable phase-matched conditions. Expressions of the insertion losses are obtained for simple slab-waveguides coupler. Numerical results of the proposed demultiplexer are presented for the slabwaveguides coupler under different design parameters. Furthermore, the wavelength dependence of the device is addressed under mismatching conditions and a Lorentzian model of the Silicon material. In addition, FDTD simulation of proposed demultiplexer is performed to prove the validity of the proposed concept. Return loss due to reflection to the source is taken into consideration in the simulation in addition to the device wavelength dependence.

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Ultra-compact, flat-top demultiplexer using anti-reflection contra-directional couplers for CWDM networks on silicon

Cited by 138 publications

References 13 publications

Universal grating coupler design

Universal grating coupler design

Integrated Bragg waveguides as an efficient optical notch filter on silicon nitride platform

Bi-Directional Coupler as a Mode-Division Multiplexer/Demultiplexer

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