12 November 1996 Scale-factor variations due to wavelength-dependent optical losses in fiber optic gyros
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Most sources of optical loss in a fiber optic gyro (FOG) depend on wavelength. Because of the broadband sources used in interferometric FOGs, these losses result in an effective shift of mean wavelength of the light producing the interference signal. For some signal processing methods, these wavelength variations produce proportional changes in the IFOG scale factor. Using well documented approximations, losses are calculated and plotted versus wavelength. A discussion of the qualitative effects on scale factor is presented and expected mean wavelength variations are computed using a representative approximation of the spectrum of a FOG source. The types of losses considered include: fiber-fiber or fiber-wave guide misalignments; microbend losses, bending losses and mode diameter mismatches. Preliminary results indicate that scale factor variations caused by such losses will contribute significantly to the total scale factor thermal sensitivity for some FOG designs. While closed loop operation results in a scale factor with fundamentally low sensitivity to variations in optical losses, most implementations are sensitive to changes in mean wavelength, thus the effects discussed here should be considered when designing high performance IFOGs and their electronics.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James A. Hammond, "Scale-factor variations due to wavelength-dependent optical losses in fiber optic gyros", Proc. SPIE 2837, Fiber Optic Gyros: 20th Anniversary Conference, (12 November 1996); doi: 10.1117/12.258184; https://doi.org/10.1117/12.258184

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