Ultra-compact silicon photonics highly dispersive elements for low-latency signal processing

Kaushal, Saket; Roberge, Anthony; Kashyap, Raman; Azaña, José

doi:10.1364/oe.476773

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…The phase-modulation based design framework described in this paper has been recently adopted to synthesize on-chip discrete phase filters for dispersion compensation of both periodic 60 and aperiodic (e.g., telecom data) signals 61 using waveguide Bragg gratings (WBGs) in a silicon on insulator (SOI) platform. By implementing the phase-only filter using WBGs designed in a spiral geometry 62 , several orders of magnitude reduction in the overall device footprint, i.e., from few cm 2 to sub-mm 2 , could be realized.…”

Section: Discussionmentioning

confidence: 99%

All-fibre phase filters with 1-GHz resolution for high-speed passive optical logic processing

et al. 2023

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Photonic-based implementation of advanced computing tasks is a potential alternative to mitigate the bandwidth limitations of electronics. Despite the inherent advantage of a large bandwidth, photonic systems are generally bulky and power-hungry. In this respect, all-pass spectral phase filters enable simultaneous ultrahigh speed operation and minimal power consumption for a wide range of signal processing functionalities. Yet, phase filters offering GHz to sub-GHz frequency resolution in practical, integrated platforms have remained elusive. We report a fibre Bragg grating-based phase filter with a record frequency resolution of 1 GHz, at least 10× improvement compared to a conventional optical waveshaper. The all-fibre phase filter is employed to experimentally realize high-speed fully passive NOT and XNOR logic operations. We demonstrate inversion of a 45-Gbps 127-bit random sequence with an energy consumption of ~34 fJ/bit, and XNOR logic at a bit rate of 10.25 Gbps consuming ~425 fJ/bit. The scalable implementation of phase filters provides a promising path towards widespread deployment of compact, low-energy-consuming signal processors.

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Section: Discussionmentioning

confidence: 99%

All-fibre phase filters with 1-GHz resolution for high-speed passive optical logic processing

et al. 2023

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“…In recent years, the adoption of silicon photonics facilitated the integration of various siliconbased photonic devices, including chirped Bragg gratings [33][34][35][36][37] , Mach-Zehnder interferometers (MZIs) 38,39 , and microring resonators (MRRs) [40][41][42][43][44][45][46] , to effectively mitigate the impact of CD in singlemode fibers (SMFs). These integrated devices offer several advantages, including a compact form factor, cost efficiency, a low power consumption, and a high reconfigurability.…”

Section: Introductionmentioning

confidence: 99%

Parallel Wavelength-Division-Multiplexed Signal Transmission and Dispersion Compensation Enabled by Soliton Microcombs and Microrings

Lu,

Liu,

Zhang

et al. 2023

Preprint

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The proliferation of computation-intensive technologies has led to a significant rise in the number of datacenters, posing challenges for high-speed and power-efficient datacenter interconnects (DCIs). Although inter-DCIs based on intensity modulation and direct detection (IM-DD) along with wavelength-division multiplexing (WDM) technologies exhibit cost-effective, power-efficient, and large-capacity properties, the requirement of multiple laser sources leads to high costs and limited scalability. Moreover, careful considerations must be given to the chromatic dispersion in the C-band as it restricts the transmission length of the optical signals. Electronic and optical approaches based on digital signal processing algorithms or dispersion-compensating fibers suffer from either a high power consumption or a lack of full reconfigurability. In this study, we present an original scalable on-chip parallel IM-DD data transmission system enabled by a single-soliton Kerr microcomb and a reconfigurable microring resonator (MRR)-based dispersion compensator. The highly compact MRR-based Kerr microcomb and dispersion compensator are intrinsically compatible with the parallel processing nature of the WDM link. Besides, the reconfigurability of the dispersion compensator shows the validation for various data-rate transmissions over multiple single-mode fiber lengths of up to 40 km, with a power consumption of below 160 mW, regardless of the modulation format or of the number of transmission channels utilized. Through our experimental validation, we demonstrate an aggregate bit rate of 1.68 Tbit/s over a 20-km-long single-mode fiber using 15 independent wavelength channels spaced at 100 GHz. Our approach holds significant promise for achieving data communications at a scale exceeding 10 terabits, making it highly valuable for future hyper-scale DCIs.

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Optics‐Enabled Highly Scalable Inverter for Multi‐Valued Logic

Kaushal,

Aadhi,

Roberge

et al. 2024

Laser & Photonics Reviews

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The rapid advancements in machine learning have exacerbated the interconnect bottleneck inherent in binary logic‐based computing architectures. An interesting approach to tackle this problem involves increasing the information density per interconnect, i.e., by switching from a two‐valued to a multi‐valued logic (MVL) architecture. However, current MVL implementations offer limited overall performance and face challenges in scaling to process data signals with radix (number of logic levels) even just above 3. In this work, a novel concept is introduced for implementation of a highly scalable and fully passive inverter based on the frequency‐domain phase‐only linear manipulation of the input MVL data signal, which is encoded in the amplitude variations of an electromagnetic wave along the time axis. As a key advantage, this solution is entirely independent of the input radix. The proposed design is implemented using an optical fibre Bragg grating device. Inversion of quaternary signals is experimentally demonstrated, as well as binary and ternary signals, at a remarkable operation speed of 32 GBaud, with an estimated energy consumption of 24 fJ/bit. The proposed method is universal and can be applied to any system that supports transmission and detection of coherent waves, such as microwave, plasmonic, mechanical, or quantum.

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Ultra-compact silicon photonics highly dispersive elements for low-latency signal processing

Cited by 4 publications

References 42 publications

All-fibre phase filters with 1-GHz resolution for high-speed passive optical logic processing

All-fibre phase filters with 1-GHz resolution for high-speed passive optical logic processing

Parallel Wavelength-Division-Multiplexed Signal Transmission and Dispersion Compensation Enabled by Soliton Microcombs and Microrings

Optics‐Enabled Highly Scalable Inverter for Multi‐Valued Logic

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