Design Space Exploration for PCM-based Photonic Memory

The integration of silicon photonics (SiPh) and phase change materials (PCMs) has created a unique opportunity to realize adaptable and reconfigurable photonic systems. In particular, the nonvolatile programmability in PCMs has made them a promising candidate for implementing optical memory systems. In this paper, we describe the design of an optical memory cell based on PCMs while exploring the design space of the cell in terms of PCM material choice (e.g., GST, GSST, Sb2Se3), cell bit capacity, latency, and power consumption. Leveraging this design-space exploration for the design of efficient optical memory cells, we present the design and implementation of an optical memory array and explore its scalability and power consumption when using different optical memory cells. We also identify performance bottlenecks that need to be alleviated to further scale optical memory arrays with competitive latency and energy consumption, compared to their electronic counterparts.Comment: This paper will appear in the proceedings of ACM GLSVLSI 202

Compact and Low-Loss PCM-based Silicon Photonic MZIs for Photonic Neural Networks

We present an optimized Mach-Zehnder Interferometer (MZI) with phase change materials for photonic neural networks (PNNs). With 0.2 dB loss, -38 dB crosstalk, and length of 52 micrometer, the designed MZI significantly improves the scalability and accuracy of PNNs under loss and crosstalk.Comment: This paper is accepted at IEEE Photonics Conference (IPC) 202

COMET: A Cross-Layer Optimized Optical Phase Change Main Memory Architecture

Traditional DRAM-based main memory systems face several challenges with memory refresh overhead, high latency, and low throughput as the industry moves towards smaller DRAM cells. These issues have been exacerbated by the emergence of data-intensive applications in recent years. Memories based on phase change materials (PCMs) offer promising solutions to these challenges. PCMs store data in the material's phase, which can shift between amorphous and crystalline states when external thermal energy is supplied. This is often achieved using electrical pulses. Alternatively, using laser pulses and integration with silicon photonics offers a unique opportunity to realize high-bandwidth and low-latency photonic memories. Such a memory system may in turn open the possibility of realizing fully photonic computing systems. But to realize photonic memories, several challenges that are unique to the photonic domain such as crosstalk, optical loss management, and laser power overhead have to be addressed. In this work, we present COMET, the first cross-layer optimized optical main memory architecture that uses PCMs. In architecting COMET, we explore how to use silicon photonics and PCMs together to design a large-scale main memory system while addressing associated challenges. We explore challenges and propose solutions at the PCM cell, photonic memory circuit, and memory architecture levels. Based on our evaluations, COMET offers 7.1x better bandwidth, 15.1x lower EPB, and 3x lower latencies than the best-known prior work on photonic main memory architecture design

Ultra Wide Band over fibre transparent architecture for High Bit-rate Home Networks

Session « short range optical communications systems »International audienceWe numerically and experimentally demonstrate the feasibility of an Ultra Wide Band (UWB) over fiber transparent architecture based on laser direct modulation and using single mode fiber (SMF) for high bit rate home networks

Experimental Demonstration of Real Time Receiver for FDMA PON

International audienceFDMA PON provides high aggregate capacity (20-40Gbps) without requiring the user modules to operate at such high data rate. In this paper, we present for the first time a real time implementation of a FDM receiver in FPGA 1Gbitps in transceiver modules for an ONU and OLT

ARCHITECTURE TRANSPARENTE EN FIBRE MULTIMODE ET TECHNOLOGIE CWDM POUR UN RESEAU LOCAL DOMESTIQUE MULTIFORMAT

National audienceNous proposons une solution de réseau domestique optique, associant une architecture transparente basée sur la fibre multimode et la technologie CWDM. Des signaux de natures différentes et diverses topologies peuvent coexister sur cette infrastructure multiformat, ce qui lui confère une grande flexibilité et une forte évolutivité. Les problèmes, issus de l'association de la technologie CWDM avec des composants passifs multimodes, sont discutés

Comparison of two types of 60 GHz photonic millimeter-wave generation and distribution of a 3 Gb/s OFDM signal

International audienceWe demonstrate and compare experimentally two set-ups achieving very high data rate (3 Gbps) wireless transmission in the 60 GHz window, both using Radio-over-Fiber (RoF) for reach extension with OFDM signal compliant to the IEEE 802.15.3.c pre-standard