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A Dual-Path FPGA Hardware Architecture for Ultra-Precise Laser Phase Stabilization in Quantum Optical ZFS Frameworks

Zulfiqar Al-zaman

Published Sep 20, 2026• 0 citations
Publisher

Abstract

This paper presents a synthesizable FPGA hardware architecture for real-time laser phase noise suppression in quantum optical and precision timing applications under the Zulfiqar Frequency-Stabilization (ZFS) framework. Utilizing a dual-actuator path combining a fast Acousto-Optic Modulator (AOM) and a high-dynamic-range Piezoelectric Transducer (PZT), the proposed architecture implements a fixed-point DSP multiplication pipeline to achieve deterministic phase correction. By integrating a calibrated fractional scaling factor within a 32-bit Q-format structure, the ZFS core compensates for high-frequency phase fluctuations while bounded by a localized phase noise floor \(\Phi_{\text{dec}} \approx 10^{-22}\ \text{rad}^2/\text{Hz}\). Post-synthesis timing simulation demonstrates robust phase-lock loop stability across a \(100\ \text{MHz}\) control clock, providing an efficient hardware foundation for atomic clocks and optical interferometry.

DOI
10.5281/zenodo.22870208

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A highly digital optical phase-locked loop (OPLL) is designed and implemented to generate phase-coherent lasers in quantum optics. All the controlling circuit in this OPLL are implemented in a single field programmable gate array (FPGA) chip. Pipeline and parallelism technology have been adapted in PID controller. Especially, an equivalent 3.5 GHz high speed clock and twisted ring counter have been integrated in the most crucial part. This OPLL has the narrow beat note line width below 1 Hz, residual mean-square phase error of 0.05 rad2and transition time of 100 μs under 10 MHz frequency step.
Ultra-narrow-linewidth lasers with suppressed high-frequency phase noise are critical for quantum control and precision metrology. While optical phase locking (OPL) is the standard technique for cloning the coherence of such sources, its effectiveness is often limited at high frequencies by feedback latency. We present a robust feedforward architecture that overcomes this limitation by recycling and demodulating the existing master-slave beat signal to drive a single electro-optic modulator for near-instantaneous noise cancellation. This approach eliminates the extraneous sidebands and transmission losses typical of more complex modulators. Through active stabilization of the beat amplitude and demodulation phase, we demonstrate robust suppression exceeding 30 dB from 10 kHz to 10 MHz. This hardware-efficient framework is readily compatible with standard OPL setups, offering a scalable solution for high-fidelity coherent control.
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