8.5-fm resonances in an amplified slow-light fiber Bragg grating for high-precision metrology

Pierre-Baptiste Vigneron; Tommy Boilard; Anna Broome; Enkeleda Balliu; Martin Bernier; Michel J. F. Digonnet

doi:10.1117/12.2552658

17 April 2020 8.5-fm resonances in an amplified slow-light fiber Bragg grating for high-precision metrology

Pierre-Baptiste Vigneron, Tommy Boilard, Anna Broome, Enkeleda Balliu, Martin Bernier, Michel J. F. Digonnet

Proceedings Volume 11296, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II; 112962P (2020) https://doi.org/10.1117/12.2552658
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Fiber Bragg gratings (FBGs) with strong apodized index modulations behave like an in-line Fabry-Perot interferometer and exhibit a series of narrow resonances in the short-wavelength portion of their transmission spectrum. These resonances have proven invaluable for detecting extremely small strains (30-femtostrain/√Hz level) or temperature changes (millidegreeC/√Hz level). The sensitivity of these fiber sensors is limited by the linewidth and peak transmission of the resonance used to interrogate the sensor, which are themselves limited by the intrinsic loss of the grating. In this work, significantly narrower and stronger resonances are demonstrated by introducing a small amount of optical gain in the FBG to offset the intrinsic loss and create a resonator with a much smaller net internal loss. The fiber Bragg grating is written in an Er-doped single-mode fiber and optically pumped to provide the required gain. The device reported here is a 6.5-mm grating with an AC index modulation of 1.59×10^-3. With only 30 μW of pump power absorbed by the grating (32.6 mW launched), the fundamental resonance of the FBG was observed to narrow from 737 fm in the absence of pump to a record linewidth of 8.5 fm. The measured peak transmission of the resonance improved from ~-37 dB to -0.2 dB. A new model that predicts the slow-light resonance spectrum of a slow-light grating in the presence of optical gain is presented. This model is in good quantitative agreement with the measured evolution of the resonance linewidth as the pump power and the power of the laser that probes the resonance lineshape are varied.

Citation Download Citation

Pierre-Baptiste Vigneron, Tommy Boilard, Anna Broome, Enkeleda Balliu, Martin Bernier, and Michel J. F. Digonnet "8.5-fm resonances in an amplified slow-light fiber Bragg grating for high-precision metrology", Proc. SPIE 11296, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II, 112962P (17 April 2020); https://doi.org/10.1117/12.2552658

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KEYWORDS

Fiber Bragg gratings

Signal attenuation

Erbium

Modulation

Signal detection

Absorption

Ions

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