We demonstrate a robust, stable and compact spectral filter for use in quantum optics experiments by implementing Fabry-Pérot resonators within optical fibre using pairs of fibre Bragg gratings. With only temperature stabilisation, these devices show less than 20 MHz frequency drift over 12 hours with a maximum suppression of roughly 35 dB and overall transmission of 75%. These characteristics make fibre Bragg grating Fabry-Pérot resonators ideal for quantum optics experiments where single photon-level signals must be efficiently filtered from large optical fields.
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