The integrated optical gyroscope is a highly possible way to achieve chip-level gyroscopes. We proposed and simulated a three-dimensional Si3N4 optical interconnect platform. It transforms the waveguide coil from a single-layer structure to a multi-layer structure, which can increase the sensing area of the coil under the same footprint. The proposed platform with low interlayer transition loss and crossing loss can reduce the overall loss in the coil and improve the theoretical angular random walk (ARW). A quadruple-layer sensing coil with a maximum radius of 30 mm and a total length of 2.08 m is derived, which can attain an ARW of 0.15 deg/√h and an insertion loss of 3.15 dB in theory.
Amid the rising demand for high-performance computing, photonic integrated circuits are increasingly overcoming the conventional two-dimensional barriers, transitioning toward more flexible multilayer structures. To fulfill this aim, we have engineered a wide-bandwidth, multilayer tunable power splitter that enables the transmission of information along the vertical direction while allowing for flexible allocation of optical power. The power splitter is constructed with an asymmetric coupler, complemented by a grating structure. The design of the coupler has been refined through optimization employing the particle swarm algorithm, while the grating structure has undergone optimization via the direct binary search algorithm. The simulation results indicate that the power divider can achieve proportional regulation from 0.285 to 3.5 across the 1400 to 1700 nm wavelength spectrum, with insertion losses (ILs) consistently below 0.34 dB. Significantly, the IL is <0.21 dB at a 1:1 power ratio. This compact, low-loss, high-bandwidth tunable power splitter was designed to offer a new idea for the multilayer integration of microchips.
Coupled resonant optical waveguide (CROW) gyroscope is an important type of integrated optical gyroscope based on Sagnac effect. However, the traditional CROW design method relying on empirical adjustment of parameters is deficient in achieving its best capability and the poor Sagnac effect of micro-scale devices leads to unsatisfactory performance of integrated devices. Therefore, the present study proposes a new approach to design CROW gyroscope by applying intelligent optimization algorithm (PSO: particle swarm algorithm) to design CROW gyroscope. Three aspects of work will be explored: Firstly, a new evaluation index is proposed to evaluate the efficiency of integrated optical gyroscope area utilization (EGA). Secondly, The performance limits for different losses and the accuracy limits and related parameters that can be achieved by increasing the resonator area at different losses are also explored. Finally, we designed theoretical performance (The angle random walk) up to 29.1𝑑𝑒𝑔/√ℎ and only 1mm × 1mm in size.
A novel and compact pressure sensor for marine application based on optical microfiber coupler interferometer(OMCI) is proposed theoretically. We theoretically analyzed the characteristics of OMCI's dual sensing unit, The highest pressure sensitivity of the waist sensing unit is 654pm/Mpa, and it increases with longer wavelength. The pressure sensitivity of the interference arm sensing unit is 7pm/Mpa, the sensitivity increases with the length of the embedded elastomer. Its excellent performance can provide strong theoretical guidance for the practical application of optical ocean monitoring equipment
According to the theory of optical waveguide transmission, the polarization correlation of mode distribution in optical microfiber was simulated by numerical calculation, and the polarization correlation of the loss caused by single particle pollutant was less than 0.01 dB. The experimental system was set up. When using ordinary laser (polarization extinction ratio is about 16 dB), the result showed that the optical microfiber would maintain the polarization of the light source, and the polarization correlation of the loss caused by the particle pollution was about 1.5 dB; If using depolarized SLD light source (polarization extinction ratio is about 0.2 dB) instead, the relative loss variation of signal light was less than 0.11 dB, which reduced by about 13 times, and the polarization correlation caused by particles attached to the optical microfiber was basically eliminated. So that using depolarized light source could solve the polarization related problem of optical microfiber particle pollution sensing.
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