METHOD FOR SUPPLEMENTARY PHASE MODULATION OF RING INTERFEROMETER OF FIBER-OPTICAL GYRO Russian patent published in 2000 - IPC

FIELD: fiber-optical equipment. SUBSTANCE: device may be used for design of electronic information processing unit for fiber- optical gyro or other detectors of physical values. method involves application of voltage to wide-band phase modulator in order to achieve supplementary phase modulation. Voltage is applied as sequence of discrete pulses, which frequency depends on time for traveling beam in light guide of sensitive coil of interferometer τ = Ln₀/C, where L is light guide length of sensitive coil, n₀ is refraction index of light guide material, C is light speed in vacuum. Phase difference of interferometer beams is represented as pulse sequence of T_o period, which has two periods, which duration is KT_o ¹ and NT_o ², respectively, where K and N are natural numbers, T_o ¹ is time period for which phase modulation is achieved as periodic pulse sequence with amplitude of ±(π-Δ). Duration of single pulse is m, where m is natural number, which conforms to condition m = T10

/2τ. T_o ² is time period, for which phase modulation is achieved also as periodic pulse sequence with amplitude of ±(π+Δ) and pulse duration of nτ, where n is natural number, which conforms to condition n = T20/2τ. Delta is within range of 0,05π ≤ Δ ≤ 0,95π. EFFECT: decreased weight and size of gyro, decreased power consumption. 2 cl, 9 dwg