Efficient, ultra-high attenuation fiber Bragg grating filter for photon noise suppression

• URL: http://arxiv.org/abs/2412.00981v1
• Date: Sun, 01 Dec 2024 22:09:25 GMT
• Title: Efficient, ultra-high attenuation fiber Bragg grating filter for photon noise suppression
• Authors: Benjamin R. Field, Chintan Mistry, Liguo Luo, Goran Edvell, Joss Bland-Hawthorn, Sergio Leon-Saval, John G. Bartholomew,
• Abstract summary: The filter consists of a fiber Bragg grating with multiple $pi$-phase discontinuities inscribed into a single mode photosensitive fiber. The measured performance closely matches the simulated spectrum calculated from the design parameters. These filters show great promise for applications reliant on high-frequency resolution noise suppression, such as quantum networking.
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• Abstract: Precision optical filters are key components for current and future photonic technologies. Here, we demonstrate a low loss spectral filter consisting of an ultrasteep bandpass feature with a maximum gradient of (90.6$\pm$0.7) dB/GHz, centred within a notch filter with (128$\pm$6) dB of suppression. The filter consists of a fiber Bragg grating with multiple $\pi$-phase discontinuities inscribed into a single mode photosensitive fiber. The measured performance closely matches the simulated spectrum calculated from the design parameters indicating a high degree of confidence in the repeatability and manufacture of such devices. These filters show great promise for applications reliant on high-frequency resolution noise suppression, such as quantum networking, and highlight the opportunities for the versatility, efficiency, and extreme suppression offered by high-performance fiber Bragg grating devices.

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