OptiLookUp: An Optical ROM-Based Lookup Table Engine for Photonic Accelerators
Ankur Singh, Akhilesh Jaiswal

TL;DR
This paper introduces a high-speed, reconfigurable optical ROM architecture using integrated microring resonators, enabling deterministic data lookup for photonic accelerators with high bandwidth and low latency.
Contribution
It presents a novel integrated photonic ROM design with spectral encoding, banked sub-arrays, and transistor-based selectors, enhancing scalability and reconfigurability.
Findings
Reliable operation at data rates up to 12.5 GHz
Spectral encoding enables deterministic lookup operations
Reconfigurability achieved via transistor-based optical selectors
Abstract
Read-only memory (ROM) provides deterministic access to predefined data mappings. Extending ROM concepts to the optical domain enables high-bandwidth, low-latency, and parallel memory access, but realizing compact and reconfigurable optical ROM remains challenging due to loss, wavelength control, and integration constraints. This work presents a high-speed, reconfigurable photonic ROM architecture implemented using integrated microring resonators (MRRs). The ROM encodes predefined input-output mappings directly in the spectral response of the photonic devices, enabling deterministic lookup-based operation without dynamic computation during readout. To improve scalability and reduce cumulative insertion loss, the architecture employs compact banked sub-arrays that are selectively addressed through an optical decoding mechanism. Reconfigurability is achieved using transistor-based optical…
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