Using High-Frequency Noiselike Modulation for Reducing Drift Processes in a LiNbO 3 -Phase Modulator of a Fiber-Optic Gy
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High-Frequency Noiselike Modulation for Reducing Drift Processes in a LiNbO3-Phase Modulator of a Fiber-Optic Gyroscope E. V. Vostrikova*, D. A. Pogorelayaa, A. N. Nikitenkoa, and A. S. Aleinika a
St. Petersburg University of Information Technologies (ITMO University), Mechanics, and Optics, St. Petersburg, 197101 Russia *e-mail: [email protected] Received April 6, 2020; revised June 26, 2020; accepted June 27, 2020
Abstract—A method to reduce the short-time phase drift of optical radiation of a LiNbO3-phase modulator of a multifunction integrated optic circuit as part of a fiber-optic gyroscope is proposed and studied. This method involves the action of a fiber-optic gyroscope with a high-frequency noiselike signal of electric voltage from 20 to 100 MHz on a phase modulator beyond the working frequency band of the fiber-optic gyroscope. Estimation of the efficiency of this method shows that an increase in the peak-to-peak voltage of the noiselike signal to 1.7 of half-wave voltages of the phase modulator makes it possible to decrease the shorttime drift of the optical radiation phase by more than four times in the band of up to 64.5 kHz. Keywords: electrooptic phase modulator, fiber-optic gyroscope, fiber optics, radiophotonics. DOI: 10.1134/S1063785020100156
At present, a new area in science and technology— radiophotonics—is becoming widely used. It studies the interaction between optical radiation and high-frequency electric signals. The principles of constructing radiophotonic systems have been described in many scientific works [1]. Using radiophotonic technologies favors the creation of new fiber optic measuring systems with parameters not achievable by traditional fiber-optic devices. For example, in [2], the authors could apply radiophotonic technologies for reducing the Allan variance for a fiber-optic gyroscope (FOG) with a laser optical radiation source. Getting such a result became possible due to using an additional phase modulation of the optical signal of a laser radiation source (the bandwidth of the Gaussian noise generator is from 10 MHz to 11 GHz at a level of –3 dB [2]), which allowed one to increase the width of the optical radiation spectrum and to decrease the influence of backward reflections appearing in the optical path of the FOG. The importance of [2] lies in reducing the Allan variance of the FOG to the level achievable with a broadband source when using a laser optical radiation source, which can potentially improve stability of the scale coefficient and reduce the cost and complexity of the FOG. In addition to the optical radiation source, one key element having an effect on accuracy characteristics of the FOG with a closed loop feedback [3] is the electrooptic phase modulator (EOM). which is usually
constructed as an integral part of a multifunction integrated optic circuit (MIOC) based on a lithium niobate (LiNbO3, LN) crystal [4]. The MIOC usually operates as an optical power splitter, polarizer, and EOM. Analysis of scientific literature allows one to distinguish the follo
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