We experimentally demonstrate wavelength conversion and bit-level memory operation in a hybridly ... more We experimentally demonstrate wavelength conversion and bit-level memory operation in a hybridly integrated III-V on SOI photonic crystal nanolaser with total footprint of 6.2μm2 and record-energy of 6.4fJ/bit, showing error-free operation at 5Gb/s.
A broadband optical RAM cell comprising a monolithic InP Flip-Flop and a Random Access Gate is ex... more A broadband optical RAM cell comprising a monolithic InP Flip-Flop and a Random Access Gate is experimentally presented with at least 5 Gb/s error-free operation and less than 4.5dB power penalty across the whole C-band.
2015 17th International Conference on Transparent Optical Networks (ICTON), 2015
The rapid increase in processor throughput is currently exceeding the electronic memory speed pro... more The rapid increase in processor throughput is currently exceeding the electronic memory speed progress, forming the well-known “Memory Wall” problem, forcing current Chip Multiprocessor (CMP) configurations to consume more than 50% of the chip real-estate for caching purposes. In that perspective, optical RAMs storing and retrieving information in the form of light with ps-scale memory access times seem to hold the potential for replacing small-size caches, offering at the same time a cache memory system being fully-compatible with optically interconnected CPU-memory architectures. In this article, we present our recent work spanning from WDM-enabled optical RAM bank architectures with optical all-passive row/column decoder modules to a complete 16GHz optical cache memory physical layer design for Chip Multiprocessor configurations and up to the Si-based integrated optical RAM cell architectures currently pursued within the FP7 RAMPLAS project.
ABSTRACT We present analytical expressions for the frequency-domain transfer function of an optic... more ABSTRACT We present analytical expressions for the frequency-domain transfer function of an optical Flip-Flop (O-FF) cell that employs an Semiconductor Optical Amplifier-Mach Zehnder Interferometer (SOA-MZI) gate and a feedback loop. Our analysis relies on first-order perturbation theory approximations applied for the first time to optical switching structures employing feedback-loop, resulting to an optical Flip-Flop frequency response that allows for a qualitative and quantitative analysis of memory speed and performance characteristics and their dependence on certain device parameters. We show that the transfer function of the optical Flip-Flop exhibits periodic resonance frequencies resembling the behavior of optical linear cavity configurations and its Free Spectral Range is mainly dictated by the length of the waveguide that forms the feedback loop, revealing this loop length as the main memory speed determining factor. Experimental verification is provided, achieving good agreement with theoretical observations. The presented design guidelines show the way for achieving memory speeds beyond 30 GHz if employing feedback loop lengths lower than 5mm, while we provide a direct comparison between optical Flip-Flops employing feedback loops or coupled switches, giving insight for future optical memories.
2019 International Topical Meeting on Microwave Photonics (MWP), 2019
We experimentally demonstrate an end-to-end Fiber Wireless A-RoF/IFoF fronthaul link using a 32-e... more We experimentally demonstrate an end-to-end Fiber Wireless A-RoF/IFoF fronthaul link using a 32-element 60GHz phased array antenna and characterize for the first time its linearity using two tone measurements, resulting in an 100Mbd uplink transmission of a 16-QAM signal and a 300Mdb QPSK with beamsteering of 15° degrees across 1km fiber and 1m V-band link, meeting the uplink user-rate KPI-requirements for 5G mmWave networks.
Towards relieving the bandwidth limitations in 5G mobile fronthaul networks, a Fiber Wireless (Fi... more Towards relieving the bandwidth limitations in 5G mobile fronthaul networks, a Fiber Wireless (FiWi) small cell architecture is presented, relying on spectrally efficient analog transport on intermediate frequency over fiber (IFoF) and a millimeter wave (mmWave) phased array antenna (PAA) interfaced with a low-loss optical add/drop multiplexer (OADM) on Si3N4/SiO2 TriPleX platform with 5 dB fiber-to-fiber losses. Specifically, four 1 Gb/s FiWi links, each carrying a 250 MBd 16-QAM signal on 5.8 GHz IFoF, are wavelength division multiplexed (WDM) and transported across a 10 km Single Mode Fiber (SMF), before being demultiplexed into the constituent channels in the OADM device and subsequently wirelessly transmitted by the PAA over a 1 m-long V-band link with 90° degree beamsteering capability. Featuring 4x 1Gb/s user rate with beamsteering to meet the respective 5G key performance indicator (KPI) for the peak user rate and an EVM within the acceptable 3GPP limit of 12.5%, the current work forms the first centralized FiWi point-to-multipoint small cell architecture with efficient transport scheme on IFoF and ubiquitous 360°-degree coverage for emerging 5G mmWave networks.
We experimentally demonstrate wavelength conversion and bit-level memory operation in a hybridly ... more We experimentally demonstrate wavelength conversion and bit-level memory operation in a hybridly integrated III-V on SOI photonic crystal nanolaser with total footprint of 6.2μm2 and record-energy of 6.4fJ/bit, showing error-free operation at 5Gb/s.
A broadband optical RAM cell comprising a monolithic InP Flip-Flop and a Random Access Gate is ex... more A broadband optical RAM cell comprising a monolithic InP Flip-Flop and a Random Access Gate is experimentally presented with at least 5 Gb/s error-free operation and less than 4.5dB power penalty across the whole C-band.
2015 17th International Conference on Transparent Optical Networks (ICTON), 2015
The rapid increase in processor throughput is currently exceeding the electronic memory speed pro... more The rapid increase in processor throughput is currently exceeding the electronic memory speed progress, forming the well-known “Memory Wall” problem, forcing current Chip Multiprocessor (CMP) configurations to consume more than 50% of the chip real-estate for caching purposes. In that perspective, optical RAMs storing and retrieving information in the form of light with ps-scale memory access times seem to hold the potential for replacing small-size caches, offering at the same time a cache memory system being fully-compatible with optically interconnected CPU-memory architectures. In this article, we present our recent work spanning from WDM-enabled optical RAM bank architectures with optical all-passive row/column decoder modules to a complete 16GHz optical cache memory physical layer design for Chip Multiprocessor configurations and up to the Si-based integrated optical RAM cell architectures currently pursued within the FP7 RAMPLAS project.
ABSTRACT We present analytical expressions for the frequency-domain transfer function of an optic... more ABSTRACT We present analytical expressions for the frequency-domain transfer function of an optical Flip-Flop (O-FF) cell that employs an Semiconductor Optical Amplifier-Mach Zehnder Interferometer (SOA-MZI) gate and a feedback loop. Our analysis relies on first-order perturbation theory approximations applied for the first time to optical switching structures employing feedback-loop, resulting to an optical Flip-Flop frequency response that allows for a qualitative and quantitative analysis of memory speed and performance characteristics and their dependence on certain device parameters. We show that the transfer function of the optical Flip-Flop exhibits periodic resonance frequencies resembling the behavior of optical linear cavity configurations and its Free Spectral Range is mainly dictated by the length of the waveguide that forms the feedback loop, revealing this loop length as the main memory speed determining factor. Experimental verification is provided, achieving good agreement with theoretical observations. The presented design guidelines show the way for achieving memory speeds beyond 30 GHz if employing feedback loop lengths lower than 5mm, while we provide a direct comparison between optical Flip-Flops employing feedback loops or coupled switches, giving insight for future optical memories.
2019 International Topical Meeting on Microwave Photonics (MWP), 2019
We experimentally demonstrate an end-to-end Fiber Wireless A-RoF/IFoF fronthaul link using a 32-e... more We experimentally demonstrate an end-to-end Fiber Wireless A-RoF/IFoF fronthaul link using a 32-element 60GHz phased array antenna and characterize for the first time its linearity using two tone measurements, resulting in an 100Mbd uplink transmission of a 16-QAM signal and a 300Mdb QPSK with beamsteering of 15° degrees across 1km fiber and 1m V-band link, meeting the uplink user-rate KPI-requirements for 5G mmWave networks.
Towards relieving the bandwidth limitations in 5G mobile fronthaul networks, a Fiber Wireless (Fi... more Towards relieving the bandwidth limitations in 5G mobile fronthaul networks, a Fiber Wireless (FiWi) small cell architecture is presented, relying on spectrally efficient analog transport on intermediate frequency over fiber (IFoF) and a millimeter wave (mmWave) phased array antenna (PAA) interfaced with a low-loss optical add/drop multiplexer (OADM) on Si3N4/SiO2 TriPleX platform with 5 dB fiber-to-fiber losses. Specifically, four 1 Gb/s FiWi links, each carrying a 250 MBd 16-QAM signal on 5.8 GHz IFoF, are wavelength division multiplexed (WDM) and transported across a 10 km Single Mode Fiber (SMF), before being demultiplexed into the constituent channels in the OADM device and subsequently wirelessly transmitted by the PAA over a 1 m-long V-band link with 90° degree beamsteering capability. Featuring 4x 1Gb/s user rate with beamsteering to meet the respective 5G key performance indicator (KPI) for the peak user rate and an EVM within the acceptable 3GPP limit of 12.5%, the current work forms the first centralized FiWi point-to-multipoint small cell architecture with efficient transport scheme on IFoF and ubiquitous 360°-degree coverage for emerging 5G mmWave networks.
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