Near Unit Efficiency in Microresonator Combs

Zang, Jizhao; Yu, Su‐Peng; Carlson, David R.; Briles, Travis C.; Papp, Scott B.

doi:10.1364/cleo_si.2022.sth4f.3

Cited by 3 publications

(11 citation statements)

References 5 publications

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“…In this section, we show an on-chip optical interconnect using the silicon photonic MDM and microcombs. The microcomb spectrum is engineered to improve a communication link capacity 28,29 , and we compare data transmission results of anomalous-and normaldispersion Kerr soliton microcombs. The experiments allow us to rigorously understand an operational limit of the foundry-compatible MDM with chip-scale lasers for a full photonic-electronic system implementation.…”

Section: On-chip Interconnectmentioning

confidence: 99%

“…3a. Microcombs are generated as circulating pulses in an optical cavity pumped with a CW laser, leading to low-noise, broadband, multi-wavelength light sources 4,28,29,37,40 . We launch 11 and 7 WDM channels into four MDM channels using microcombs with 300-GHz and 500-GHz frequency spacings (Fig.…”

Section: On-chip Interconnectmentioning

confidence: 99%

“…The 300-GHz-comb is generated in an anomalous-dispersion Si 3 N 4 ring resonator, and the spectral envelope of the comb exhibits a secantsquared profile. The 500-GHz-comb is generated in a Ta 2 O 5 photonic crystal ring resonator that enables comb generations under normal dispersion (see method for more detail), resulting in higher conversion efficiency, optical power per comb line, and spectral flatness 28,29,40 . All data channels are directly detected using external photodiodes, and individual channels are encoded with non-return-to-zero (NRZ) data coding at a symbol rate of 40 GBd.…”

Section: On-chip Interconnectmentioning

confidence: 99%

“…The pump tone at ~193.1 THz couldn't be used for data transmission as well. For the transmission experiment using a spectrally flattened Ta 2 5 combs 28,29 , 28 data channels were derived from four spatial modes and all the comb lines in the C band. In contrast to the Si 3 N 4 combs, all of them were used for data transmission without an error occurs when a total of 10 12 bits are compared, as a result of the engineered comb spectrum.…”

Section: On-chip Interconnectmentioning

confidence: 99%

“…Using photonic inverse design 26,27 , we implement a low-crosstalk, all-passive silicon MDM that supports parallel WDM channels over a 15-THz spectral bandwidth. With this device, we demonstrate a 1.12-Tb/s errorfree data transmission on a silicon photonic circuit using microcombs 28,29 as multi-wavelength laser sources: 28 data channels derived from seven wavelength channels launched into four spatial mode channels. The MDM device also enables spectrally efficient WDM due to its non-resonant operation.…”

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confidence: 99%

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Multi-dimensional data transmission using inverse-designed silicon photonics and microcombs

et al. 2022

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The use of optical interconnects has burgeoned as a promising technology that can address the limits of data transfer for future high-performance silicon chips. Recent pushes to enhance optical communication have focused on developing wavelength-division multiplexing technology, and new dimensions of data transfer will be paramount to fulfill the ever-growing need for speed. Here we demonstrate an integrated multi-dimensional communication scheme that combines wavelength- and mode- multiplexing on a silicon photonic circuit. Using foundry-compatible photonic inverse design and spectrally flattened microcombs, we demonstrate a 1.12-Tb/s natively error-free data transmission throughout a silicon nanophotonic waveguide. Furthermore, we implement inverse-designed surface-normal couplers to enable multimode optical transmission between separate silicon chips throughout a multimode-matched fibre. All the inverse-designed devices comply with the process design rules for standard silicon photonic foundries. Our approach is inherently scalable to a multiplicative enhancement over the state of the art silicon photonic transmitters.

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Section: On-chip Interconnectmentioning

confidence: 99%

Section: On-chip Interconnectmentioning

confidence: 99%

Section: On-chip Interconnectmentioning

confidence: 99%

Section: On-chip Interconnectmentioning

confidence: 99%

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confidence: 99%

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Multi-dimensional data transmission using inverse-designed silicon photonics and microcombs

et al. 2022

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Massively scalable Kerr comb-driven silicon photonic link

et al. 2023

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The growth of computing needs for artificial intelligence and machine learning is critically challenging data communications in today’s data-centre systems. Data movement, dominated by energy costs and limited ‘chip-escape’ bandwidth densities, is perhaps the singular factor determining the scalability of future systems. Using light to send information between compute nodes in such systems can dramatically increase the available bandwidth while simultaneously decreasing energy consumption. Through wavelength-division multiplexing with chip-based microresonator Kerr frequency combs, independent information channels can be encoded onto many distinct colours of light in the same optical fibre for massively parallel data transmission with low energy. Although previous high-bandwidth demonstrations have relied on benchtop equipment for filtering and modulating Kerr comb wavelength channels, data-centre interconnects require a compact on-chip form factor for these operations. Here we demonstrate a massively scalable chip-based silicon photonic data link using a Kerr comb source enabled by a new link architecture and experimentally show aggregate single-fibre data transmission of 512 Gb s−1 across 32 independent wavelength channels. The demonstrated architecture is fundamentally scalable to hundreds of wavelength channels, enabling massively parallel terabit-scale optical interconnects for future green hyperscale data centres.

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Energy Efficiency Bounds for Photonic Analog to Digital Converters

Deakin,

Liu

2024

J. Lightwave Technol.

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Many efforts have examined the prospect of photonic based analog to digital converters (ADCs) and shown that they can substantially outperform their electronic counterparts in terms of speed and resolution. In this paper we analyse the power consumption of photonic ADCs, which has not been meaningfully examined in previous literature yet is a critical figure of merit for analog to digital conversion. Firstly, we show that in a quantum noise limited regime photonic based converters cannot exceed the efficiency of conventional electronic designs in any reasonable operating environment. However, we further show that the exceptional performance of photonic ADCs at high frequencies may allow them to outperform high sampling rate electronic ADCs on a Schreier figure of merit basis, whose performance is limited by technological constraints such as clock jitter and the switching speed of the integrated circuit technology.

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Near Unit Efficiency in Microresonator Combs

Abstract: We optimize the pump-laser conversion efficiency in soliton frequency combs by controlling the nonlinear shift, external coupling, and bidirectional pump field with photonic-crystal resonators. We achieve and explain >86% pump-to-comb conversion efficiency.

Cited by 3 publications

References 5 publications

Multi-dimensional data transmission using inverse-designed silicon photonics and microcombs

Multi-dimensional data transmission using inverse-designed silicon photonics and microcombs

Massively scalable Kerr comb-driven silicon photonic link

Energy Efficiency Bounds for Photonic Analog to Digital Converters

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