Fig 5 - uploaded by Artem Aleinik
Content may be subject to copyright.
Source publication
The electro-optical modulator is one of the most important parts of the fiber optic gyroscope. Unfortunately, the integral implementation of the modulator has a number of undesirable effects such as parasitic amplitude modulation, phase drift and acousto-optical resonance effects. Influence of the first two effects on the gyroscope operation has be...
Context in source publication
Similar publications
Electric field detection has been widely utilized in many fields such as scientific research and integrated circuits. To enhance the tuning sensitivity of E-field sensor, in this paper, we theoretically proposed a highly sensitive E-field sensor composed of etchless lithium niobate (LN) material and hybrid coupling-grating systems in the visible ne...
In this paper, we propose a comprehensive electro-optical co-design framework for power-efficient high-speed VCSEL transmitter targeting at 50 Gbaud. The framework integrates a rate-equation based VCSEL chip model and driver circuit models. Subject to the transmitter specifications defined by IEEE 400G standard, the driver circuit design of NRZ and...
Electrically tunable metasurfaces have gained special interest as they can realize ultrathin surface-normal modulators in planar geometries. In this paper, we demonstrate a novel metasurface modulator based on electro-optic (EO) polymer that utilizes bimodal resonance inside a metallic subwavelength grating to increase the modulation efficiency. Wh...
This article reports opto-electronic switching properties of heterostructure GaN/AlGaN lateral Avalanche Transit Time (ATT) diode oscillator. A novel technique has been adopted for the incorporation of 2DEG effect in two-terminal device. This is achieved through the inherent conduction band offset and subsequent application of Cathode Field Plate (...
The article deals with influence of various ways to place vibration transmitters on efficiency of rooms safety for negotiations. Standing for remote vibration listening of window glass, electro-optical channel, the most typical technical channel of information leakage, was investigated. The modern system "Sonata-AB" of 4B model is used as an active...
Citations
... The phase modulator introduces a bias phase into the IFOG, causing the IFOG to operate at the point of maximum response sensitivity. Both the piezoelectric (PZT) phase modulator for open-loop IFOGs and lithium niobite (LN) phase modulator for closed-loop IFOGs are key components determining the performance of an IFOG [11][12][13][14]. Advances in IFOG technology have largely come to rely upon the phase modulator, especially LN phase modulators. ...
We present a novel, to the best of our knowledge, white light interferometric fiber-optic gyroscope (IFOG) scheme using a fiber-optic rhombic optical path difference (OPD) bias structure to interrogate with a sensing coil to realize rotation rate measurement without a phase modulator. The OPD bias structure composed of four ( ${2} \times 1$ 2 × 1 ) 3 dB single-mode fiber couplers was constructed to implement non-reciprocal OPD bias. White light interferometric demodulation was utilized to acquire the change in OPD due to the Sagnac-phase shift. Absolute linear output can be obtained. We produced the principle prototype of rhombic OPD bias white light IFOG without utilizing a phase modulator. An experimental demonstration of the IFOG prototype system achieves linear output with respect to the OPD difference in detecting rotation rate.
... tion processing, tunable optical filters, deflectors, broadband delay lines, mode-lockers, acoustic optic sensors, and laser radiation modulators [10][11][12][13]. An acousto-optic modulator (AOM), also called a Bragg cell, uses sound waves to diffract the frequency of light. ...
The purpose of this study was to clarify the silicon-germanium dioxide (SiGeO 2) and Aluminum In-dium Gallium Arsenide (AlInGaAs) based acoustic optic modulators for upgrading transmission performance characteristics. The transient time response of these modula-tors is analyzed and discussed in detail. The 3-dB modulation signal bandwidth, diffraction signal efficiency, signal rise time, and signal quality factor with minimum data error rates are also considered. The proposed models with silicon-germanium dioxide and Aluminum Indium Gal-lium Arsenide acoustic optic modulators were compared to the previous model with silicon acoustic optic modu-lators. The results confirmed the high-performance efficiency of the proposed models when compared to the previous model, in both the lowest transient time response and the highest acoustic optic modulators speed response.
... Herein, the EO effect in the MIOC is considered as a combination of the following three effects: (1) The intrinsic EO effect, (2) the change of light path due to piezoelectric displacement, and (3) the photo-elastic effect due to the piezoelectric strain. Further, the optical retardation caused by the effects above can be defined as [13,14] ...
... where n e is the extraordinary refractive index; γ c is the intrinsic EO coefficient; E is the E-field intensity; l is the light pass length; λ is the wavelength; ∆n is the initial birefringence independent of the E-field; ∆l is the change of light path length; and p i,j,k,l and S k,l are the photo-elastic coefficient and elastic strain, respectively. Considering these effects, the equivalent EO coefficient can be expressed as [13,14] γ II c = λ πn 3 e El ...
... where ∆l and S k,l are considered a function of frequency. In order to better match the reality, a phase-lag between the E-field and piezoelectric displacement is introduced, and the overall EO coefficient is represented by [13,14] ...
The multifunction integrated optical chip (MIOC) is one of the most critical parts of the interferometric fiber optic gyroscope (IFOG), and research on the halfwave voltage of the MIOC is meaningful for a high-precision IFOG. In this paper, the correlation between the frequency and halfwave voltage, which affects the interference light intensity of IFOG, is presented theoretically. A widespread measurement method for frequency dependence of the halfwave voltage, based on lock-in amplification and sinusoidal modulation, is proposed. Further, the measurement result and the oscillation of interference light intensity in the Sagnac interferometer are presented, which are in great agreement with the theory. This paper proposes the frequency dependence of the halfwave voltage and provides a new error research direction for the improvement of the MIOC in a high-precision IFOG.
... Particularly, closed-loop FOG provides bias stability better than 0.01 °/h so it is widely used in inertial navigation systems [7,8]. The FOG feedback modulation chain is typically performed with phase electro- optic modulator executed in Multi-functional Integrated Optical Chip (MIOC) on Lithium Niobate (LiNbO3, LN) substrate [9,10]. ...
A lithium niobate (LN) phase modulator is widely spread because of high electro-optic coefficients. Particularly it is a highly required component for a closed-loop fiber-optic gyroscope (FOG) of navigation and tactical grade. However, low-frequency distortions of LN phase modulator frequency response can degrade FOG performance. The present paper deals with research and compensation of frequency response of an LN phase modulator. It is a complex task to measure the response of an LN phase modulator in a FOG because of its Sagnac interferometer. Therefore, the special and novel modulation/demodulation algorithm is proposed. To the best of our knowledge and belief the proposed method is the first published method that provides the measurement of the pulse response of a phase modulator as a part of a closed-loop FOG. The pulse response obtained in the proposed way allows getting appropriate high order transfer function of a phase modulator. For the first time to our knowledge, the humidity dependence of LN phase modulator frequency response is found. Influence of phase modulator frequency response on FOG angular random walk, bias drift and scale factor nonlinearity and instability is theoretically analyzed and mathematically simulated. The algorithmic method of phase modulator response compensation is proposed and experimentally confirmed. Experimental results show that the proposed measurement technique of phase modulator transfer function allows creating the compensating inverse filter that provides phase modulator response being close to flat. The application of the proposed method in the FOG operating mode allows reducing unwanted spikes to the noise level.
The multifunctional optical integrated circuit (MIOC) is a key component of interferometric fiber optic gyroscope (IFOG), and the phase error in its signal modulation process will inevitably bring output signal error to the IFOG. This article theoretically analyzes and simulates the modulation and output of gyroscopes from the perspective of energy loss caused by MIOC resonance. This article establishes an IFOG testing system and it is found that the fluctuation frequency of the gyroscope output is consistent with the resonance frequency of the MIOC, which proves the correlation between the two. This article also achieves the effect of reducing the output fluctuation of the gyroscope by adjusting the frequency composition of the modulation signal to avoid the resonance frequency of MIOC, which has strong engineering practicality.
Due to the need for providing low-cost, small-size, and high-reliability calibration solution around the clock independently, the Micro-Electro-Mechanical System (MEMS) inertial measurement unit (IMU) is a hot topic currently. In this paper, we propose a new calibration method based on MEMS IMU with the assistance of the FOG IMU. Different from the traditional MEMS IMU calibration, a Four-Position-and-Three-Rotation (FPTR) calibration sequence is designed in the conditions of lacking turntable. The simulation result shows that all 24 calibration parameters converge through the calibration rotation scheme. An experiment result of qualitative analysis is presented, by comparing the traditional method and proposed calibration method, which reveals the repeatability and stability of the proposed method. In practical applications, this FPTR calibration method can effectively reduce the calibration time and improve the experimental efficiency. In summary, the proposed method is suitable for the mass production calibration of MEMS IMU, and possesses the ability to calibrate full parameters of MEMS IMU at once without turntable or other devices. The research outcomes can provide a practical basis for MEMS IMU plus FOG IMU calibration.
Nowadays, the fiber optic current sensor (FOCS) has been massively used on the warships. However, the performance of the FOCS will be greatly affected by the impact on warships, since the stress field caused by the impact will introduce an elastic-opitc effect-induced bias error to the FOCS. To improve the performance of FOCS applied in warships, the accurate model of elastic-optic effect-induced bias error is necessary for its practical applications. In this paper, we analyze the mechanical stress on an in-line Sagnac fiber optic current sensor during the impact and find that the bias error is mainly caused by the stress acting on the delay coil. Then we present a mathematical model of non-anisotropic phase error caused by impact on delay coil from the perspective of the three-dimensional model and theoretical results is obtained by simulation. Finally, experiments are carried out according to the test methods specified in national standards. The correctness of the error mathematical model is verified by experiments that the differences between simulation and experiment are within 10%.
