An All-Optical Address Look-Up Table Using Optical CAM and Optical RAM Banks

4 × 4 bit Programmable Optical Memory Array With Digital Addressing Using Micro-Ring Resonators

“…The idea of optical memory addressing with bit sequence, as well as building addressable storage is discussed in [20][21][22][23][24]. Some of these works are based on using Mach-Zehnder Interferometer (MZI) for both role of decoder and memory cell [20][21][22], where authors used SOA-MZI as memory cell. In this type of memory cell, Semiconductor Optical Amplifier (SOA) sits on one branch of MZI.…”

“…Differing from works in [20][21][22][23], this work seeks to maximize the number of memory cells in a compact space. While Narayan et al (2022) [24] also based their design by maximizing storage, our objective is to maintain a constant optical light during the 'read' operation, with address selection performed using an electrical signal.…”

20 GHz Silicon Integrated Optical Ternary Content Addressable Memory (CAM) Cell

“…In order to efficiently resolve packet addressing, optics have recently started to penetrate the look-up address domain, by developing optical CAM alternatives that can be utilized in fast look-up tables [5]- [9]. Early experimental demonstrations of InP SOA-MZI-based single optical binary [5] and ternary CAM (TCAM) cells [6] supporting 10 Gb/s search speeds have been presented and more recently extended to a complete 4×2-bit CAM address look-up prototype [7], requiring, however, a rather high power consumption due to the use of semiconductor optical amplifiers (SOAs). An alternative 2-bit CAM Matchline (ML) architecture relying on cascaded integrated silicon photonic (SiPho) micro-ring resonators (μRR) [4] was also recently demonstrated, necessitating again a wavelength-encoded scheme for the search word bits and performing at a speed of 4 Gb/s.…”

An all-passive Si3N4 optical row decoder circuit for addressable optical RAM memories

“…Fetching data from the memory in current computing architectures is still carried out at a lower speed compared to the processing speed offered by the CPUs, a problem that has been already identified a few decades ago and is typically referred to as the "Memory Wall [1]. The efforts to overcome the speed limitations of electronic random-access memories (RAM) led to the introduction of a plethora of optical memory and optical RAM technologies during the last two decades [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], with the main target being the transfer of the high-speed capabilities of photonic technologies into the memory segment. This aims at creating a seamless interface between the optical memory and the optical bus waveguide, enabling a transition into a data fetching and storing paradigm that can be performed exclusively in the optical domain.…”