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图像处理
张少宇  伍春晖  熊文渊  
收起
摘要
锂离子电池健康状态(State of Health,SOH)描述了电池当前老化程度,对于提前对电池的故障及失控做出预警避免电池的不安全行为具有重要意义。其估计难点在于难以确定数量合适、相关性高的估计输入以及设计合适的估计算法。通过对现有电池老化数据集的研究发现,电池充电过程中电压曲线数据相对稳定,且随着电池的老化出现规律性变化。因此,文中直接采用充电过程中电压数据作为估计SOH的输入,并在数据驱动的框架下,提出了一种基于门控循环神经网络(Recurrent Neural Networks with Gated Recurrent Unit, GRU-RNN)的锂电池SOH估计方法。该方法能够挖掘出一维电压数据中的时序特征和SOH之间的映射规律。在两个公开的电池老化数据集上的实验结果表明,提出的方法达到了1.25%的均方绝对误差和低于5.62%的最大误差,在估计精度上达到现有技术发展水平。
红外与激光工程
2021, 50(2): 20200339
光学器件
刘时杰  郑远林  陈险峰  
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摘要
铌酸锂晶体是一种综合性质优异的多功能光学材料。在过去几十年里,对铌酸锂晶体的研究一直是光学研究的热点之一。近年来发展起来的绝缘体上铌酸锂(LNOI),亦称为铌酸锂薄膜(LNTF),在光学领域被公认为是一项变革性技术。基于LNOI的集成光子器件让铌酸锂晶体又焕发了新生命,再次成为集成光子学的研究焦点。作为最优秀的非线性晶体之一,铌酸锂薄膜在频率转换方面是其他薄膜材料无法替代的。总结了基于铌酸锂薄膜的非线性频率转换最新研究进展,包括二阶非线性、三阶非线性、级联非线性和光学频率梳等,最后对LNOI平台上光子集成回路(PIC)的前景进行了展望。
光学学报
2021, 41(8): 0823013
Nonlinear Optics
摘要
We use the nonlinear coupled-mode theory to theoretically investigate second-harmonic generation (SHG) in subwavelength x-cut and z-cut lithium niobate (LN) thin-film waveguides and derive the analytical formula to calculate SHG efficiency in x-cut and z-cut LN thin-film waveguides explicitly. Under the scheme of optimal modal phase matching (MPM), two types of LN thin films can achieve highly efficient frequency doubling of a 1064 nm laser with a comparable conversion efficiency due to very consistent modal field distribution of the fundamental wave and second-harmonic wave with efficient overlap between them. Such a robust MPM for high-efficiency SHG in both the subwavelength x-cut and z-cut LN thin-film waveguides is further confirmed in a broad wavelength range, which might facilitate design and application of micro–nano nonlinear optical devices based on the subwavelength LN thin film.
Chinese Optics Letters
2021, 19(7): 071902
Special Issue on Lithium Niobate Based Photonic Devices
摘要
We theoretically propose a hybrid lithium niobate (LN) thin-film waveguide that consists of an amorphous silicon stripe and etch-free z-cut LN for highly efficient wavelength conversion, circumventing the challenging etching on LN material. Profiting from the spatial symmetry breaking of the waveguide, the asymmetric hybrid modes can spontaneously achieve phase matching with small modal area and large spatial mode overlap, enabling enhanced second harmonic generation with a normalized conversion efficiency over 3900% W-1·cm-2 (0.5-mm-long propagation distance). The choice of integrating silicon with LN alleviates the fabrication challenge, making the platform potentially compatible with silicon photonics.
Chinese Optics Letters
2021, 19(6): 060004
Early Posting
摘要
High-<i>Q</i> lithium niobate (LN) optical micro-resonators are excellent platform for future applications in optical communications, nonlinear optics and quantum optics. To date, high <i>Q</i> factors are typically achieved in LN using either dielectric masks or femtosecond laser ablation, while the more standard and commonly available lift-off metallic masks are often believed to lead to rough sidewalls and lowered <i>Q</i> factors. Here we show that LN microring resonators with strong light confinement and intrinsic <i>Q</i> factors over 1 million can be fabricated using optimized lift-off metallic masks and dry etching processes, corresponding to a waveguide propagation loss of ~ 0.3 dB/cm. The entire process is fully compatible with wafer-scale production and could be transferred to other photonic materials.
Chinese Optics Letters
2021, 19(6):
Special Issue on Lithium Niobate Based Photonic Devices
摘要
We demonstrate high-quality (intrinsic Q factor ~2.8 × 106) racetrack microresonators fabricated on lithium niobate thin film with a free spectral range (FSR) of ~86 pm. By integrating microelectrodes alongside the two straight arms of the racetrack resonator, the resonance wavelength around 1550 nm can be red shifted by 92 pm when the electric voltage is raised from -100 V to 100 V. The microresonators with the tuning range spanning over a full FSR are fabricated using photolithography assisted chemo-mechanical etching.
Chinese Optics Letters
2021, 19(6): 060002
Special Issue on Lithium Niobate Based Photonic Devices
摘要
Integrated traveling-wave lithium niobate modulators need relatively large device lengths to achieve low drive voltage. To increase modulation efficiency within a compact footprint, we report an integrated Fabry–Perot-type electro-optic thin film lithium niobate on insulator modulator comprising a phase modulation region sandwiched between two distributed Bragg reflectors. The device exhibits low optical loss and a high tuning efficiency of 15.7 pm/V. We also confirm the modulator’s high-speed modulation performance by non-return-to-zero modulation with a data rate up to 56 Gbit/s.
Chinese Optics Letters
2021, 19(6): 060003
Early Posting
摘要
We report on the fabrication and optimum of lithium niobate planar and ridge waveguide at the wavelength of 633 nm. To obtain a planar waveguide, oxygen ions at the energy of 3.0 MeV with a fluence of 1.5×1015 ions/cm2 are implanted in the polished face of LiNbO3 crystals. For planar waveguide, a loss of 0.5 dB/cm is obtained after annealing at 300 oC for 30minutes. The ridge waveguide is fabricated by diamond blade dicing method on optimized planar waveguide. The guiding properties are investigated by prism coupling and end-face coupling method.
Chinese Optics Letters
2021, 19(6):
Early Posting
摘要
Periodically poled lithium niobate on insulator (PPLNOI) ridge waveguides are desirable for high-efficiency nonlinear frequency conversions, and the fabrication process of such waveguides is crucial for the device performance. In this work, we report fabrication and characterization of local periodically poled ridge waveguide. Ridge waveguides were fabricated by dry etching, then the high-voltage pulses were applied to locally poled the ridge waveguides. Second harmonic generation with a normalized conversion efficiency of 435.5%W-1cm-2 was obtained in the PPLNOI ridge waveguide, which was consistent with the triangular domain structure revealed by the confocal microscopy.
Chinese Optics Letters
2021, 19(6):
Early Posting
摘要
Lithium niobate on insulator (LNOI), as an emerging and promising optical integration platform, faces shortages of on-chip active devices including lasers and amplifiers. Here, we report the fabrication on-chip erbium-doped LNOI waveguide amplifiers based on electron beam lithography and inductively coupled plasma reactive ion etching. A net internal gain of ~30 dB/cm in communication band was achieved in the fabricated waveguide amplifiers under the pump of a 974-nm continuous laser. This work develops new active devices on LNOI and will promote the development of LNOI integrated photonics.
Chinese Optics Letters
2021, 19(6):
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