Mr. Harinder Singh Profile

Harinder Singh

at Hindustan Aeronautics Ltd

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Proceedings Article | 3 March 2022 Presentation + Paper

Investigation of bias stability enhancement using frequency comb source in resonant fiber optic gyroscope

Sumathi Mahudapathi, Anish Bekal, Harinder Singh, Balaji Srinivasan

Proceedings Volume 12016, 120160T (2022) https://doi.org/10.1117/12.2610072

KEYWORDS: Frequency combs, Resonators, Fiber optic gyroscopes, Mode locking

Read Abstract +

Bias stability is a critical performance parameter in navigation applications. We investigate the possibility of enhancing the bias stability in a navigation grade Resonant Fiber Optic Gyroscope (RFOG) through the use of dual frequency comb source. In a conventional RFOG, a single wavelength laser source is used to generate counter propagating waves in a ring resonator whose phase difference is measured to obtain the rotation rate. However, the primary limitation of the RFOG performance is the bias drift observed due to non-reciprocal effects such as Kerr nonlinearity, Rayleigh backscattering, and environmental fluctuations. To enhance the bias stability, we have investigated an alternative approach based on a frequency comb source. By using different set of frequencies (3, 5, 7, 9 etc) for the counter propagating waves, the above limitations can be mitigated since the uncertainty in the demodulated phase is diminished compared to a single frequency measurement leading to enhanced accuracy in the rotation rate determination. Using a theoretical model of the frequency comb-based RFOG, we have carried out simulations in Matlab and investigated the bias stability enhancement with respect to the number of comb lines used. Our simulation results shows that a bias stability of 0.01°/hr can be achieved using frequency comb source with 5 fundamental modes in ring resonator.

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