Experimental demonstration of response-enhanced fiber Sagnac gyroscopy via imaginary weak-value amplification
We experimentally demonstrate a 100-m long fiber Sagnac gyroscope employing imaginary weak-value amplification (IWVA) to enhance the optical readout response to rotation. A Sagnac-induced polarization phase is converted into a measurable spectral response through polarization post-selection and spectrally resolved detection. By varying the post-selection angle, we characterize the gyroscope response over the experimentally accessible rotation-rate range. The response increases systematically toward orthogonal post-selection, yielding a maximum experimental enhancement of approximately 13 times relative to a fixed reference configuration without postselection. Fast Fourier transform and Allan-deviation measurements further characterize the noise and stability of the gyroscope. Near-orthogonal post-selection reduces the equivalent rotation-rate fluctuations, with the minimum Allan deviation decreasing from $0.06~\mathrm{rad/s}$ for the reference configuration to $0.0091~\mathrm{rad/s}$ for the configuration exhibiting the maximum response enhancement, corresponding to an approximately 6.6-fold reduction. Low-frequency fluctuations of the broadband superluminescent diode source limit the long-term stability. These results demonstrate that IWVA provides a practical approach for response-enhanced fiber-based Sagnac gyroscopy and precision rotation sensing.