2D Grating Coupler Induced Polarization Crosstalk in Coherent Transceivers for Next Generation Data Center Interconnects

Georgieva, Galina; Seiler, Pascal M.; Mai, Christian; Petermann, K.; Zimmermann, Lars

doi:10.1364/ofc.2021.w1c.4

Cited by 5 publications

(7 citation statements)

References 7 publications

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“…Here, we extend the work from Ref. [24] in several aspects. First, we provide a more comprehensive study on polarization related parameters of 2D GCs, namely, the polarization split ratio and the polarizations' angular relation.…”

Section: Introductionmentioning

confidence: 58%

“…All 2D GCs have a coupling angle ϑ = 8 • at the symmetry plane. Below, we begin with conventional designs, as those used in our previous work [24].…”

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

confidence: 99%

“…We have further indicated in-plane scattering as the physical origin of this conversion [23] -an issue, which inevitably occurs due to the finite size of the diffracting elements of 2D GCs with respect to the optical waveguide mode. In our most recent work [24], the impact of the cross-polarization has been investigated on system level. We have shown that the crosspolarization is related to a polarization crosstalk, and while at the 2D GC's design central wavelength the polarizations remain orthogonal to each other, at other wavelengths the polarizations' orthogonality is lost.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 58%

“…All 2D GCs have a coupling angle ϑ = 8 • at the symmetry plane. Below, we begin with conventional designs, as those used in our previous work [24].…”

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

confidence: 99%

Section: Introductionmentioning

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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“…Finally, with the procedure outlined in Ref. [31], we found that the out-coupled 2D GC signals from the two arms are 95°-polarized to each other at 1550 nm.…”

Section: C-band A-si:h 2d Gcs At the Metal2 Levelmentioning

confidence: 82%

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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“…spot-size converters (SSC), should be implemented. The additional use of polarization rotator-splitter would also allow for an efficient realization of dual polarization coherent receivers, avoiding concerns regarding the non-orthogonality of 2-dimensional GRCs [19]. The use of SSCs would not only improve the coupling efficiency, but also open the device to communication links from O-to L-band.…”

Section: A Optical Interface and 2 × 2 MMI Networkmentioning

confidence: 99%

Multiband Silicon Photonic ePIC Coherent Receiver for 64 GBd QPSK

Seiler¹,

Voigt²,

Pęczek

et al. 2022

J. Lightwave Technol.

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Multiband coherent communication is being handled as a promising candidate to address the increasing demand for higher data rates and capacity. At the same time, coherent communication is expected to enter the data center domain in the near future. With coherent data links in both, data-and telecom, spanning multiple optical bands, novel approaches to coherent transceiver design and traffic engineering will become a necessity. In this work, we present a monolithically integrated silicon photonic coherent receiver for O-and C-band. The receiver features a 2 × 2 multi-mode interference coupler network as 90 • hybrid optimized for 1430 nm (E-band). The total power consumption is 460 mW at a footprint of approximately 6 mm 2 , and an opto-electrical bandwidth of 33 GHz. 64 GBd operation is demonstrated in O-and C-band, which is competitive to the state-of-the-art for silicon photonic coherent receiver in the Cband, and the highest symbol rate to date for O-band coherent communication.

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2D Grating Coupler Induced Polarization Crosstalk in Coherent Transceivers for Next Generation Data Center Interconnects

Cited by 5 publications

References 7 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

Multiband Silicon Photonic ePIC Coherent Receiver for 64 GBd QPSK

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