Lin S C, Giallorenzi T G
Appl Opt. 1979 Mar 15;18(6):915-31. doi: 10.1364/AO.18.000915.
The sensitivity of a recently reported optical-fiber ring interferometer as a gyroscope has been analyzed. Photomixing SNRs were derived for the detection schemes. Noise sources due to the Rayleigh, Brillouin, Mie, and core-cladding interface light scattering processes are assessed quantitatively. Optimum gyroscope sensitivities are discussed via numerical examples for optical wavelengths lambda = 0.633 microm and lambda = 1.1 micro and both spontaneous and stimulated noises. Results show that (a) to reduce trapped scattered light by a factor of 100, mode stripping is essential, (b) lambda = 1.1 microm is a more promising wavelength to use, and (c) high optical power operation, where the only noise is due to stimulated Brillouin scattering, gives better sensitivity than the low-power case. Examples show that at lambda = 0.633 microm, the achievable sensitivities are 0.0078 deg/h at 2 mW and 0.0009 deg/h at 81 mW; and at lambda = 1.1 microm, they are 0.0025 deg/h at 2 mW and 0.0007 deg/h at 14.4 mW. These calculated sensitivities are better than those of current laser ring gyroscopes.
对最近报道的一种用作陀螺仪的光纤环形干涉仪的灵敏度进行了分析。推导了用于检测方案的光混频信噪比。对由瑞利、布里渊、米氏以及纤芯 - 包层界面光散射过程引起的噪声源进行了定量评估。通过针对光波长λ = 0.633微米和λ = 1.1微米以及自发噪声和受激噪声的数值示例，讨论了最佳陀螺仪灵敏度。结果表明：(a) 要将捕获的散射光降低100倍，模式剥离至关重要；(b) λ = 1.1微米是更有前景的使用波长；(c) 在仅由受激布里渊散射产生噪声的高光功率运行情况下，比低功率情况具有更好的灵敏度。示例表明，在λ = 0.633微米时，2毫瓦功率下可实现的灵敏度为0.0078度/小时，81毫瓦功率下为0.0009度/小时；在λ = 1.1微米时，2毫瓦功率下为0.0025度/小时，14.4毫瓦功率下为0.0007度/小时。这些计算出的灵敏度优于当前的激光环形陀螺仪。
