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.
We designed and studied a narrowband absorber with two absorption peaks for mid-infrared spectroscopy and multispectral detection applications. The absorber is composed of a silicon grating loaded on a continuous gold film. The grating has two silicon strips in each unit cell, with the same height but different widths. Numerical results indicate that the absorption peaks under normal incidence locate at wavelengths of ∼3.863 and ∼4.004 μm, with bandwidths of ∼28 and ∼33 nm, respectively. Both peaks exhibit high absorptivities of >0.996. We found that the excited surface-plasmon-polariton modes traveling in different directions in the structure are spectrally separated and result in the two absorption peaks.
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