On the Development of an RFSoC-Based Ultra-Fast Phasemeter With GHz Bandwidth - INSPIRE

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On the Development of an RFSoC-Based Ultra-Fast Phasemeter With GHz Bandwidth

Mar 12, 2024

8 pages

Published in:

IEEE Trans.Instrum.Measur. 74 (2025) 2001108

Published: 2025

e-Print:

2403.08083 [physics.ins-det]

DOI:

10.1109/TIM.2024.3509586

View in:

ADS Abstract Service

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Abstract: (IEEE)

Precise measurements of the change in the frequency and phase of an electrical or optical signal play a key role in various branches of science and engineering. Tracking changing laser frequencies is especially demanding when the lasers themselves are noisy or if the frequencies rapidly change because they encode highly dynamic signals in, e.g., Doppler-ranging or dynamic cavity readout. Here, to address these and other possible applications, we report the development of a high signal bandwidth (>2 GHz) and high tracking bandwidth (2 MHz) multichannel phasemeter. The implementation utilizes an all-digital phase-locked loop (ADPLL) realized within the field programmable gate array (FPGA) part of a radio frequency system-on-chip (RFSoC), the programmable logic (PL). The benchmark level parameters of the phasemeter are obtained by operating the PL at its timing limits and introducing a novel multi-demodulation and phase accumulation scheme. We present performance measurements, discuss the role of the high tracking bandwidth for tracking highly dynamic signals, and demonstrate ultra-stable phase locking of a beat note between two widely tunable external cavity diode lasers. Within our implementation, we have included a direct measurement of the open-loop gain of the phase-locked loop (PLL) and an estimation of the residual phase error. These features are new in the field of FPGA-based phasemeter developments. We achieve a phase-noise floor in the sub-milli radian regime when comparing two signals, even for GHz frequencies, and demonstrate stable tracking of signals with a frequency change rate of 240 GHz/s.

Note:

Copyright 2024 The Authors. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. For more information, see https://creativecommons.org/licenses/by-nc-nd/4.0/

Bandwidth
Phase locked loops
Frequency measurement
Measurement by laser beam
Table lookup
Phase measurement
Laser stability
Laser noise
Instruments
Field programmable gate arrays

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