Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.25950 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866914067603521536 |
|---|---|
| author | Dasigi, Karthik Dmitriev, Pavel A. Wo, Kah Jen Hanamura, Fumiya Kong, Lingda Touzard, Steven |
| author_facet | Dasigi, Karthik Dmitriev, Pavel A. Wo, Kah Jen Hanamura, Fumiya Kong, Lingda Touzard, Steven |
| contents | Optical Vector Analysers (OVA) are critical for emerging technologies such as integrated photonics and optical positioning. Achieving a sensitivity near the Standard Quantum Limit (SQL) while acquiring a wide spectrum allows an accurate measurement of targets that are fragile, non-linear, or that scatter most of the probe light away. Existing OVAs operate with a sensitivity orders of magnitude below the SQL. In this paper, we use a free-running interferometer with a frequency range of 20 THz as an OVA. We introduce novel methods to mitigate the phase noise and obtain a unit signal-to-noise ratio for powers at the fW level. We apply this technique towards quantifying the fabrication quality of microring resonators in thin-film Lithium Niobate. Our characterisation yields a signal-to-noise ratio above 1 with much less than 1 circulating photon and reveals a quality factor above 5 millions, unambiguously attributed to low internal losses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_25950 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum-Limited Optical Vector Analysis Dasigi, Karthik Dmitriev, Pavel A. Wo, Kah Jen Hanamura, Fumiya Kong, Lingda Touzard, Steven Optics Optical Vector Analysers (OVA) are critical for emerging technologies such as integrated photonics and optical positioning. Achieving a sensitivity near the Standard Quantum Limit (SQL) while acquiring a wide spectrum allows an accurate measurement of targets that are fragile, non-linear, or that scatter most of the probe light away. Existing OVAs operate with a sensitivity orders of magnitude below the SQL. In this paper, we use a free-running interferometer with a frequency range of 20 THz as an OVA. We introduce novel methods to mitigate the phase noise and obtain a unit signal-to-noise ratio for powers at the fW level. We apply this technique towards quantifying the fabrication quality of microring resonators in thin-film Lithium Niobate. Our characterisation yields a signal-to-noise ratio above 1 with much less than 1 circulating photon and reveals a quality factor above 5 millions, unambiguously attributed to low internal losses. |
| title | Quantum-Limited Optical Vector Analysis |
| topic | Optics |
| url | https://arxiv.org/abs/2509.25950 |