A Simple and Robust Balanced Homodyne Detector for High-Repetition-Rate Pulsed Sources
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914457857294336 |
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| author | Altilia, Samuele Suerra, Edoardo Puppi, Pietro Corli, Sebastiano Prati, Enrico Cialdi, Simone |
| author_facet | Altilia, Samuele Suerra, Edoardo Puppi, Pietro Corli, Sebastiano Prati, Enrico Cialdi, Simone |
| contents | We design and experimentally characterize a balanced homodyne detector optimized for high-repetition-rate (100 MHz) pulsed optical sources. Unlike conventional transimpedance-amplifier architectures, which suffer from nonlinearities and dynamic instabilities with ultrashort pulses, our approach allows to directly amplify the photocurrent extracted at the common photodiode node without feedback loops. A theoretical model describing the detector response, noise, and pulse-to-pulse correlations is developed, providing quantitative predictions for the signal variance, signal-to-noise ratio (SNR), and inter-pulse correlations. Implemented with two matched InGaAs photodiodes illuminated by a 1030 nm mode-locked laser at 100 MHz, the detector exhibits excellent linearity and shot-noise-limited scaling of the signal variance with optical power. Optimizing the temporal integration window yields a maximum SNR of about 14 dB, while correlation measurements confirm negligible inter-pulse correlations. These results demonstrate that the proposed architecture offers a robust and simple solution for high-speed pulsed homodyne detection, suitable for quantum optics and continuous-variable quantum information applications. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_06994 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Simple and Robust Balanced Homodyne Detector for High-Repetition-Rate Pulsed Sources Altilia, Samuele Suerra, Edoardo Puppi, Pietro Corli, Sebastiano Prati, Enrico Cialdi, Simone Optics Quantum Physics We design and experimentally characterize a balanced homodyne detector optimized for high-repetition-rate (100 MHz) pulsed optical sources. Unlike conventional transimpedance-amplifier architectures, which suffer from nonlinearities and dynamic instabilities with ultrashort pulses, our approach allows to directly amplify the photocurrent extracted at the common photodiode node without feedback loops. A theoretical model describing the detector response, noise, and pulse-to-pulse correlations is developed, providing quantitative predictions for the signal variance, signal-to-noise ratio (SNR), and inter-pulse correlations. Implemented with two matched InGaAs photodiodes illuminated by a 1030 nm mode-locked laser at 100 MHz, the detector exhibits excellent linearity and shot-noise-limited scaling of the signal variance with optical power. Optimizing the temporal integration window yields a maximum SNR of about 14 dB, while correlation measurements confirm negligible inter-pulse correlations. These results demonstrate that the proposed architecture offers a robust and simple solution for high-speed pulsed homodyne detection, suitable for quantum optics and continuous-variable quantum information applications. |
| title | A Simple and Robust Balanced Homodyne Detector for High-Repetition-Rate Pulsed Sources |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2604.06994 |