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Crosstalk-free multichannel sensor based on a dual-Sagnac interferometer interrogated by microwave photonic filter

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Optoelectronics Letters 2025年

作者： ZHANG Ailing WANG Bo ZHANG Yongfu CHANG Pengxiang WANG Minghe LIN Rui engineering Research Center of Optoelectronic Devices & communication Technology， Ministry of Education， Tianjin Key Laboratory of Film Electronic and communication Devices， school of Electrical and Electronic engineering， Tianjin University of Technology

A crosstalk-free multichannel sensor based on a dual-Sagnac interferometer interrogated by microwave photonic filter (MPF) is demonstrated theoretically and experimentally in this paper. The dual-Sagnac interferometer is taken as the sensing element as well as an optical spectrum slicer to implement a dual-passband MPF. Experimental results show that the proposed multichannel sensor is crosstalk-free， and the temperature sensitivity of each channel is -0.9884 MHz/℃ and -1.9302 MHz/℃， respectively. The sensing interrogation system has good linearity and stability and it is suitable for application scenarios where multiple points of temperature are required to monitor simultaneously.

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Sensitivity improvement by Vernier effect in microwave photonic filter based on F-P fiber ring

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Optoelectronics Letters 2025年

作者： LIN Rui ZHANG Ailing CHANG Pengxiang PAN Honggang WANG Minghe WANG Bo engineering Research Center of Optoelectronic Devices & communication Technology， Ministry of Education， Tianjin Key Laboratory of Film Electronic and communication Devices， school of Electrical and Electronic engineering， Tianjin University of Technology

A high sensitivity fiber optic temperature sensor based on Vernier effect in microwave photonic filter based on two paralleled F-P (Fabry-Perot) fiber ring is proposed and experimentally verified. Sensitivity is improved through the Vernier effect， which is caused by two parallel F-P fiber rings with approximate lengths. Temperature interrogation is achieved by monitoring the notch frequency of the superimposed frequency response curve. The temperature sensitivity of -484.514kHz/℃ is achieved in experiment， which is 57 times of the sensor without Vernier effect. The improved sensitivity and simple structure make it have wide potential applications in temperature monitoring of power systems.

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Multiplexing metal grating coupler based on MIM structure

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Optoelectronics Letters 2025年

作者： LIU Yang LIU Fei MA Yunxia ZHANG Ailing engineering Research Center of communication Devices and Technology， Ministry of Education， Tianjin Key Laboratory of Film Electronic and communication Devices， school of Integrated Circuit Science and engineering， Tianjin University of Technology

We propose and numerically investigate a multiplexing metal grating coupler based on metal/insulator/metal （MIM） structure. The coupler consists of gold grating/silicon/gold layers， which combines with MIM waveguide， concurrently achieving path multiplexing and wavelength multiplexing through TMnmodes coupling. In visible light band， TM waves are coupled to the upper surface of gold plate， and the coupling efficiency reaches maximum of 31.67% at wavelength of 736 nm. In near infrared and mid infrared bands， TM waves are coupled into MIM waveguide， and the coupling efficiency reaches maximum of 53.57% at wavelength of 2550 nm. There can be four modes of TM0， TM1， TM2and TM3simultaneously in MIM waveguide， which are excited at different wavelengths. The preparation process of the structure designed in this article is simple， with dimensions at the micrometer level， easy to be integrated， and can be applied to be integrated optical circuits.

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Optimization of CZTSSe thin film solar cell performance using PbS back surface field layer

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Optoelectronics Letters 2025年

作者： WENJING LUO ZHIJIAN BAI YUMING XUE LUOXIN WANG YANHONG DING HONGLI DAI Tianjin Key Laboratory of Film Electronic & communication Devices， school of Electronics Information engineering， Tianjin University of Technology school of Materials Science and engineering ，Jilin University

CZTSSe is an Earth-abundant， environmentally friendly， and low-cost material， with a current record power conversion efficiency of 14.9%， This result is well below the prediction of the Shockley-Queisser limit. To improve the performance of solar cells， a layer of PbS (BSF) was added to the CZTSSe， which was simulated using the SCAPS-1D software. The optimal photovoltaic performance of AZO/ZnO/CdS/CZTSSe/PbS/Mo was studied by changing the parameters of the CZTSSe absorption layer and PbS layer. Studies have shown that the efficiency can be increased to 20.86% after using PbS.

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High sensitivity dual polarization four channels surface plasmon resonance refractive index sensor with wide detection range and high linearity based on photonic crystal fiber

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Optoelectronics Letters 2025年

作者： CUI Nan PAN Honggang ZHANG Ailing ZHAO Zihong CHEN Zhipan ZHANG Bo Tianjin Key Laboratory of Film Electronic and communication Devices， engineering Research Center of Optoelectronic Devices and communication Technology， Ministry of Education， school of Integrated Circuit Science and engineering， Tianjin University of Technology

In this paper， we propose and numerically characterize the optical characteristics of a high sensitivity dual polarization four channels surface plasmon resonance refractive index sensor with wide detection range and high linearity based on photonic crystal fiber （PCF）. Four light transmission channels are constructed by using big air holes. The small rectangular air hole in the center of the fiber core is used to add asymmetry. We use gold plasma material to achieve better sensing performance. A thin film of TiO2is placed on the PCF surface， which assists gold in the adhesion on PCF. The maximum wavelength sensitivity of the sensor can reach 20000 nm/RIU in both x and y polarization modes. While the maximum wavelength resolution of the sensor is 5×10-6RIU. The average wavelength sensitivity reached 15900nm/RIU and 15800nm/RIU in x and y polarization mode. The sensor features R2=0.9969 / R2=0.9966 high linear performance in x and y polarization mode and the maximum FOM values 509.13 RIU-1/ 489.63 RIU-1in x and y polarization mode. Besides the sensor’s detection range is 1.26-1.36， which is a wide refractive index detection range. The sensor has a wide range of applications in biomedical and other fields.

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Design of high performance multi-notch filters based on photonic crystal nanorod flower-shaped resonators

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Optoelectronics Letters 2025年

作者： YAN WEI ZHANG SHUANGGEN ZHANG WEIWEI Tianjin Key Laboratory of Film Electronic and communication Devices， engineering Research Center of Optoelectronic Devices and communication Technology， Ministry of Education， school of Integrated Circuit Science and engineering， Tianjin University of Technology

Photonic crystal notch filter plays a vital role in photonics applications which can selectively attenuate the unwanted interference. However， it remains challenging to achieve high efficiency and is generally limited to the single notch performance. Here， we demonstrated a high efficient all-silicon multi-notch filter scheme utilizing photonic crystal nanorod flower-shaped resonators. Based on the single resonant cavity， the dielectric columns can be introduced to create the intracavity asymmetry achieving double notch， meanwhile by adding the certain scattering nanorods to trap light efficiently， it can also obtain triple notch. The results emanate that the transmission and the Q of single notch up to 2.6% and 16209.4， double notch 0.5%， 0.1% and 12371.7，13934.5， triple notch 0.2%， 0.5%， 2.3%， 2312.9， 2062.8， 2327.4 can be achieved， respectively. The proposed high efficient multi-notch filters could potentially catalyze advancements in filter technology within the realm of silicon photonics applications and optical communication.

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A triple-band miniaturized end-fire antenna based on odd-mode spoof surface plasmonic polariton waveguide resonator

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Optoelectronics Letters 2025年

作者： BAI Yukun MAO Mengqun Tianjin Key Laboratory of Film Electronic and communication Devices， engineering Research Center of Optoelectronic Devices and communication Technology， Ministry of Education， school of Integrated Circuit Science and engineering， Tianjin University of Technology

A triple-band miniaturized end-fire antenna based on the odd modes of spoof surface plasmonic polariton (SSPP) waveguide resonator is proposed in this paper. To meet the ever increasing demand for more communication channels and less antenna sizes， multi-band antennas are currently under intensive investigation. By a novel feeding method， three odd modes are excited on an SSPP waveguide resonator， which performs as an end-fire antenna operating at three bands， 7.15-7.26GHz， 11.6-12.2GHz and 13.5-13.64GHz. It exhibits reasonably high and stable maximum gains of 5.26， 7.97 and 10.1dBi and maximum efficiencies of 64%， 92% and 98% at the three bands， respectively. Moreover， in the second band the main beam angle shows a frequency dependence with a total scanning angle of 19°. The miniaturized triple-band antenna has a great potential to be applied in wireless communication systems， satellite communication and radar systems.

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A reduction scheme of PAPR in CO-OFDM system using time-delay neural networks

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Optoelectronics Letters 2025年

作者： TONG Zhengrong LIU Zhihong WANG Hao ZHANG Weihua ZHANG Tianhao JIA Qiqi Tianjin Key Laboratory of Thin Film Electronics and communication Devices， engineering Research Center for Optoelectronic Devices and communication Technology of the Ministry of Education， school of Integrated Circuit Science and engineering， Tianjin University of Technology

An iterative partial transmission sequence （IPTS） cascading time-delay neural network （TDNN） scheme is proposed to reduce peak-to-average power ratio （PAPR） in the coherent optical orthogonal frequency division multiplexing （CO-OFDM） systems. The IPTS algorithm further reduces computational complexity based on the partial transmission sequence （PTS） algorithm. TDNN is trained by the iterative clipping filtering （ICF） method. Simulation results show that the proposed scheme achieves a PAPR reduction of 5.84 dB when complementary cumulative distribution function （CCDF） is 10-4and an extra transmission distance of 200 km for 10-3bit error rate （BER） compared to the original signals.

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Terahertz dual-beam leaky-wave antenna based on multi-mode spoof surface plasmon polariton waveguide

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Optoelectronics Letters 2025年

作者： BAI Yukun HAN Yuanqing Tianjin Key Laboratory of Film Electronic and communication Devices， engineering Research Center of Optoelectronic Devices and communication Technology， Ministry of Education， school of Integrated Circuit Science and engineering， Tianjin University of Technology

In this paper， a terahertz dual-beam leaky-wave antenna (LWA) based on a multi-mode spoof surface plasmon polariton (SSPP) waveguide is proposed. By dispersion engineering of the SSPP transmission line (SSPP TL)， multiple modes are excited on the SSPP TL. A dual-beam LWA is constructed based on the radiation from the first space harmonics of the guided fundamental mode and the first higher-order mode. The simulation results show that the antenna radiates frequency-dependent dual beams in the 1.9 ～ 2.6 THz operating frequency band. The average gains for the two beams are 12.9 dBi and 8.2 dBi， respectively. The compact dual-beam LWA is promising in the application of wireless communication and radar systems.

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