2024/12/01 by Benjamin R. Field, Field, Benjamin R., Chintan Mistry +11
Engineering · Physics and Astronomy · #Advanced Fiber Optic Sensors #Advanced Fiber Laser Technologies #Photonic and Optical Devices
paper · pdf · doi:10.48550/arxiv.2412.00981
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±0.7) dB/GHz, centred within a notch filter with (128±6) dB of suppression. The filter consists of a fiber Bragg grating with multiple π-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.