Few-MHz bandwidth tunable optical filter based on a fiber-ring resonator

• URL: http://arxiv.org/abs/2506.11953v1
• Date: Fri, 13 Jun 2025 17:04:31 GMT
• Title: Few-MHz bandwidth tunable optical filter based on a fiber-ring resonator
• Authors: Gabriele Maron, Anton Bölian, Xin-Xin Hu, Luke Masters, Arno Rauschenbeutel, Jürgen Volz,
• Abstract summary: We present a fiber-ring resonator that realizes an ultra-narrowband, high-extinction, low-loss, tunable optical filter.<n>It consists of a pair of commercial variable ratio directional couplers that allow precise adjustment of the filter bandwidth and its on-resonance transmission.
• Score: 2.357397994148727
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a fiber-ring resonator that realizes an ultra-narrowband, high-extinction, low-loss, tunable optical filter. It consists of a pair of commercial variable ratio directional couplers that allow precise adjustment of the filter bandwidth and its on-resonance transmission. This design also grants access to multiple modes of operation, such as a simultaneous band-stop and band-pass filter. Our characterization reveals a bandwidth of less than 2 MHz, together with an extinction exceeding 20 dB. The tunability of the filter properties establishes our device as a versatile platform for selective frequency filtering with sub-natural atomic linewidth resolution.

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