Toward coherent O-band data center interconnects

Seiler, Pascal M.; Georgieva, Galina; Winzer, G.; Pęczek, Anna; Voigt, K.; Lischke, Stefan; Fatemi, Adel; Zimmermann, Lars

doi:10.1007/s12200-021-1242-0

Cited by 29 publications

(18 citation statements)

References 61 publications

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“…Considering that, the segmented O-band 2D GC shows more advantages compared to its C-band equivalent and its application in DP 16 QAM coherent systems would be reasonable. This adds further arguments to the discussion on O-band coherent DCIs [39].…”

Section: B Segmented 2d Grating Couplersmentioning

confidence: 66%

“…Using the methods given in the previous section, we compare here exemplary 2D GCs for C-and O-Band within a 40 nm bandwidth around their central wavelengths both numerically and in coherent system simulations. O-band coherent systems are also discussed as a potential candidate for next generation DCIs [39]. All C-and O-band 2D GCs are specifically designed under the boundary conditions of the photonic BiCMOS platform that we use [40], [41].…”

Section: Evaluation Of 2d Grating Couplers For C-and O-bandmentioning

confidence: 99%

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Penalties From 2D Grating Coupler Induced Polarization Crosstalk in Silicon Photonic Coherent Transceivers

et al. 2022

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Silicon photonic two-dimensional grating couplers for C-and O-band dual-polarization coherent transceivers are analyzed with respect to their polarization splitting/combining performance. Due to scattered light in the grating's plane, a linear cross-polarization results. The latter is responsible for a limited polarization split ratio and a polarizations' non-orthogonality. The impact of these two quantities is evaluated by system-level simulations with regard to OSNR penalties in coherent systems. For both C-and O-band, a design modification for reduced penalties is proposed.

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Section: B Segmented 2d Grating Couplersmentioning

confidence: 66%

Section: Evaluation Of 2d Grating Couplers For C-and O-bandmentioning

confidence: 99%

Penalties From 2D Grating Coupler Induced Polarization Crosstalk in Silicon Photonic Coherent Transceivers

et al. 2022

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“…In the final numerical analysis, we compare similarly 2D GCs with bulk Si or metal mirror in the O-Band. Coherent solutions using O-band have the potential to compete in the data center domain as well [32]. We choose the same SiO 2 thicknesses as for C-band, which are not necessarily optimal for O-band.…”

Section: C-band and O-band A-si:h 2d Gcs At The Topmetal1 Levelmentioning

confidence: 99%

Dual-polarization multiplexing amorphous Si:H grating couplers for silicon photonic transmitters in the photonic BiCMOS backend of line

Georgieva

Mai

Seiler

et al. 2022

Front. Optoelectron.

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In this paper, we report on polarization combining two-dimensional grating couplers (2D GCs) on amorphous Si:H, fabricated in the backend of line of a photonic BiCMOS platform. The 2D GCs can be used as an interface of a hybrid silicon photonic coherent transmitter, which can be implemented on bulk Si wafers. The fabricated 2D GCs operate in the telecom C-band and show an experimental coupling efficiency of − 5 dB with a wafer variation of ± 1.2 dB. Possibilities for efficiency enhancement and improved performance stability in future design generations are outlined and extension toward O-band devices is also investigated. Graphical Abstract

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“…Given the strong refractive index contrast in the O and C telecommunication bands, compact C-band based SOI passive devices have been efficiently implemented with SOI p-i-n junction and bulk Ge or GeSi Franz-Keldysh modulators 7 . Nevertheless, the demand for compact transceivers with lower power consumption and large modulation bandwidth in the O-band 8 , has driven interests in demonstrating efficient integration of modulators based on the quantum-confined Stark effect (QCSE) 9 , 10 on silicon. QCSE type modulators are formed by barrier and well layers realised through material engineering which compose the active region for operation at specific wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Coupling strategy between high-index and mid-index micro-metric waveguides for O-band applications

Skandalos

Bucio

Mastronardi

et al. 2022

Sci Rep

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The integration of fast and power efficient electro-absorption modulators on silicon is of utmost importance for a wide range of applications. To date, Franz-Keldysh modulators formed of bulk Ge or GeSi have been widely adopted due to the simplicity of integration required by the modulation scheme. Nevertheless, to obtain operation for a wider range of wavelengths (O to C band) a thick stack of Ge/GeSi layers forming quantum wells is required, leading to a dramatic increase in the complexity linked to sub-micron waveguide coupling. In this work, we present a proof-of-concept integration between micro-metric waveguides, through the butt-coupling of a $${1.25}\,{\upmu \hbox {m}}$$ 1.25 μ m thick N-rich silicon nitride (SiN) waveguide with a $${1.25}\,{\upmu \hbox {m}}$$ 1.25 μ m thick silicon waveguide for O-band operation. A numerical analysis is conducted for the design of the waveguide-to-waveguide interface, with the aim to minimize the power coupling loss and back-reflection levels. The theoretical results are compared to the measured data, demonstrating a coupling loss level of $${0.5}\,\hbox {dB}$$ 0.5 dB for TE and TM polarisation. Based on the SiN-SOI interconnection simulation strategy, the simulation results of a quantum-confined Stark effect (QCSE) stack waveguide coupled to a SiN waveguide are then presented.

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Toward coherent O-band data center interconnects

Cited by 29 publications

References 61 publications

Penalties From 2D Grating Coupler Induced Polarization Crosstalk in Silicon Photonic Coherent Transceivers

Penalties From 2D Grating Coupler Induced Polarization Crosstalk in Silicon Photonic Coherent Transceivers

Dual-polarization multiplexing amorphous Si:H grating couplers for silicon photonic transmitters in the photonic BiCMOS backend of line

Coupling strategy between high-index and mid-index micro-metric waveguides for O-band applications

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