Journals >Optical Communication Technology
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2025
Volume: 49 Issue 2
20 Article(s)
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Sensitivity adjustable fiber Bragg grating strain sensor based on circular ring structure
ZHANG Yuanyuan, LI Ruiya, HUANG Jun, WEI Li, and TAN Yuegang
In order to meet the strain measurement needs of different occasions, a sensitivity coefficient adjustable fiber Bragg grating (FBG) strain sensor based on circular ring structure is proposed. By adjusting the geometric parameters of the annulus on an elastic substrate, flexible regulation of sensitivity is achieved. AIn order to meet the strain measurement needs of different occasions, a sensitivity coefficient adjustable fiber Bragg grating (FBG) strain sensor based on circular ring structure is proposed. By adjusting the geometric parameters of the annulus on an elastic substrate, flexible regulation of sensitivity is achieved. At the same time, temperature-compensated FBG is utilized to eliminate the interference of environmental temperature changes on the measurement results. A theoretical model of the sensor has been established, and a desensitized FBG strain sensor is developed. The measurement performance of this sensor is verified through finite element simulation and experiments. The experimental results show that the sensitivity of the sensor within the range of ± 3 000 με is 0.49 pm/με, and the linear correlation coefficient is above 0.99. Meanwhile, its repeatability error is 0.68% and hysteresis error is 2.96%, demonstrating good stability and reliability..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 1 (2025)
Au nanoparticles composite THz metamaterial sensor based on laser fabrication
ZHANG Yabo, PEI Guang'ao, YE Yunxia, and DAI Zijie
To address the issues of complex pretreatment and low sensitivity in traditional pesticide detection methods, an Au nanoparticles(AuNPs) composite terahertz(THz)metamaterial sensor based on laser fabrication is proposed. Periodic double U-shaped metamaterial arrays and AuNPs are prepared using picosecond laser direct wTo address the issues of complex pretreatment and low sensitivity in traditional pesticide detection methods, an Au nanoparticles(AuNPs) composite terahertz(THz)metamaterial sensor based on laser fabrication is proposed. Periodic double U-shaped metamaterial arrays and AuNPs are prepared using picosecond laser direct writing and nanosecond laser scanning techniques, respectively. The combination of these two components enhances the interaction between THz waves and analytes. The simulation and experimental results demonstrate that the local electric field enhancement induced by AuNPs significantly improves the sensor's sensitivity, with the THz resonance intensity of the composite sensor being more than 12 times higher than that of the bare sensor. The experimental data further reveal that the detection limit of the sensor for chlorothalonil can reach 10 μg/mL..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 7 (2025)
Optimization denoising method based on combined with TLGMCC criterion CEEMDAN and LWT
LIU Yanming, CAO Min, SUN An, and XIANG Ganliang
Aiming at the problem of excessively low signal-to-noise ratio(SNR) in distributed optical fiber acoustic sensing systems, an optimized noise reduction method is proposed, which is based on the combination of time-domain localized generalized maximum correntropy criterion (TLGMCC), adaptive noise complete ensemble empiAiming at the problem of excessively low signal-to-noise ratio(SNR) in distributed optical fiber acoustic sensing systems, an optimized noise reduction method is proposed, which is based on the combination of time-domain localized generalized maximum correntropy criterion (TLGMCC), adaptive noise complete ensemble empirical mode decomposition with adaptive noise(CEEMDAN), and lifting wavelet transform(LWT). This method first uses adaptive noise CEEMDAN to decompose the original signal, obtaining modal components. Then, the original signal and these modal components are segmented into multiple time-localized segments, and their corresponding local time segment correntropy values are calculated. Afterwards, the LWT algorithm is applied to process weakly correlated components, and finally, the remaining components are reconstructed to complete the denoising process. Experimental results show that under the conditions of a 5 km sensing distance and 10 m spatial resolution, the system's SNR reached 54.36 dB, while the root mean square error was reduced to 0.091..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 11 (2025)
Design of multi-target classification and recognition algorithm based on fiber optic sensing network
YUAN Jiaojie, JIAO Mengtian, and ZHAO Jiewen
In order to achieve target type recognition when multiple targets are working simultaneously in fiber optic sensing network, a multi-target classification and recognition algorithm based on fiber optic sensing networks is designed. This algorithm constructs a solution model based on the wavelength response of test nodeIn order to achieve target type recognition when multiple targets are working simultaneously in fiber optic sensing network, a multi-target classification and recognition algorithm based on fiber optic sensing networks is designed. This algorithm constructs a solution model based on the wavelength response of test nodes, using signal amplitude, duration, and frequency as characteristic parameters of the target signal. Signal acquisition is carried out through a fiber optic sensing network networked with fiber Bragg grating (FBG), and the collected signals are subjected to feature extraction and analysis. The experimental results indicate that wavelength response tests are conducted on four typical vibration sources within a testing area of 20 m×30 m. The four targets have different signal characteristics: target 1 has a wavelength amplitude mean of 1 250 pm and a periodic feature of approximately 120 ms. The average wavelength amplitude of targets 2 and 3 is between 150~350 pm. The average wavelength amplitude of target 4 exceeds 3 200 pm, with a duration of approximately 15 seconds..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 17 (2025)
Characteristic analysis of a microtube cavity refractive index sensor based on wedge-shaped fiber
CHEN Weiyin, and WU Xiangnong
To address the issues of low mechanical strength and weak robustness in the tapered waist region of existing tapered fiber-coupled microtube cavity whispering gallery mode (WGM) sensors, a microtube cavity refractive index sensor based on a wedge-shaped fiber (WSF) is proposed. By utilizing the evanescent field excitedTo address the issues of low mechanical strength and weak robustness in the tapered waist region of existing tapered fiber-coupled microtube cavity whispering gallery mode (WGM) sensors, a microtube cavity refractive index sensor based on a wedge-shaped fiber (WSF) is proposed. By utilizing the evanescent field excited from the WSF end-face to couple with the microtube cavity and form WGM, a theoretical model is established using the finite-difference time-domain (FDTD) method. The effects of wedge angle, wall thickness, and microtube cavity outer diameter on refractive index sensing characteristics are thoroughly investigated. The simulation results show that when the wedge angle is 20°, the tube wall thickness is 1 μm, and the microtube outer diameter is 110 μm, the sensor achieves a refractive index sensitivity of 326.5 nm/RIU, a quality factor of 3.236× 103, and a resolution of 6.12×10-5 RIU. When used for glucose concentration detection, the sensor demonstrates a sensitivity of 0.085 nm/mM and a resolution of 0.23 mM..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 23 (2025)
Classification and recognition method based on intra-class and inter-class distances and AdaBoost-SCN
ZHAO Huailiang, YANG Runping, ZHAO Shaohua, SU Runmei, CHEN Linyu, SHANG Qiufeng, and YAO Guozhen
To improve the recognition accuracy and real-time performance of transmission line icing monitoring, this paper proposes a classification and recognition method based on intra-class and inter-class distances and adaptive boosting random configuration network (AdaBoost-SCN). First, the phase signals from phase-sensitiveTo improve the recognition accuracy and real-time performance of transmission line icing monitoring, this paper proposes a classification and recognition method based on intra-class and inter-class distances and adaptive boosting random configuration network (AdaBoost-SCN). First, the phase signals from phase-sensitive optical time-domain reflectometry are jointly evaluated using intra-class and inter-class distance metrics. A scoring strategy is then applied to reduce the dimensionality of the full feature vector, thereby extracting key sensitive features. Subsequently, the AdaBoost-SCN algorithm is employed for icing severity classification and recognition, where the random configuration network serves as the base classifier, and a strong classification model is constructed through iterative optimization. The experimental results demonstrate that the proposed method achieves an average recognition accuracy of 94.7% on the test set, outperforming traditional methods by 2%~5%, while reducing computation time from 0.54 s to 0.32 s..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 29 (2025)
Effect of IQ demodulation low-pass filter cut-off frequency variation on Φ-OTDR system performance
ZHANG Zhenhe, LIU Fengnian, ZHANG Guojing, LAI Rong, ZHANG Junkai, HUANG Yixuan, ZHONG Qing, and LONG Sheng
To optimize the signal demodulation quality, spatial resolution, and vibration localization performance of the phase-sensitive optical time domain reflectometry (-OTDR) system, this paper investigates the effect of the low-pass filter (LPF) cut-off frequency on system performance based on the heterodyne coherent detectTo optimize the signal demodulation quality, spatial resolution, and vibration localization performance of the phase-sensitive optical time domain reflectometry (Φ-OTDR) system, this paper investigates the effect of the low-pass filter (LPF) cut-off frequency on system performance based on the heterodyne coherent detection of the Φ-OTDR system with under-sampling and in-phase and quadrature(IQ) demodulation techniques. In the experiment, the narrow linewidth laser, the acoustic optical modulator, the balanced photoelectric detector and other devices are used to construct the system, and five LPFs with different cut-off frequencies(12.5, 10, 7.5, 5, 2.5 MHz) are set for comparative analysis. The results show that when the LPF cut-off frequency is 7.5 MHz, the signal-to-noise ratio (SNR) of the demodulated signal reaches the highest value (40 dB), and the signal quality is more stable between different sampling points. Meanwhile, the LPF cut-off frequency has no obvious effect on the spatial resolution of the system, but there is an error on the vibration localization(about 2~5 m)..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 34 (2025)
SV-VMD vibration localization and signal recovery method based on Φ-OTDR
XIONG Peiyuan, XU Shaohua, LI Heng, CHEN Dahua, CHEN Cong, YANG Song, and DU Hao
In response to the issues of low localization accuracy and signal recovery difficulties caused by insufficient signal-to-noise ratio in traditional phase difference methods for vibration localization, a sliding variance variational mode decomposition(SV-VMD) vibration localization and signal recovery method based on phIn response to the issues of low localization accuracy and signal recovery difficulties caused by insufficient signal-to-noise ratio in traditional phase difference methods for vibration localization, a sliding variance variational mode decomposition(SV-VMD) vibration localization and signal recovery method based on phase-sensitive optical time-domain reflectometer(Φ-OTDR) is proposed. The SV algorithm calculates the phase difference variance via a sliding window and selects the phase within the 10 m range preceding the vibration point as the corrected reference phase, effectively suppressing cumulative noise. The VMD algorithm separates the effective signal component from trend noise through multi-scale decomposition, thereby eliminating direct current offsets induced by orthogonal demodulation. The experimental results demonstrate that compared to conventional differential methods, the SV algorithm improves the system signal-to-noise ratio by 12 dB(from 14 dB to 26 dB) and clearly resolves interference events at 400 m and 650 m in multi-vibration-source scenarios. The VMD algorithm with optimized parameters (penalty factor α=100, mode number K=3) successfully recovers the triangular wave signal and significantly suppresses non-vibration-related noise..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 40 (2025)
Novel sensing system based on few mode fiber long-period grating
FENG Shiqiang, HUANG Yonglin, and YANG Wenxin
To address the issue of temperature cross sensitivity in fiber optic grating sensors, a novel sensing system based on few mode fiber long-period gratings is proposed. This system utilizes the characteristic of few mode optical fibers that can transmit fundamental modes and a small number of higher-order modes, and achiTo address the issue of temperature cross sensitivity in fiber optic grating sensors, a novel sensing system based on few mode fiber long-period gratings is proposed. This system utilizes the characteristic of few mode optical fibers that can transmit fundamental modes and a small number of higher-order modes, and achieves effective coupling between core modes and cladding modes by adjusting the grating period. The system is composed of two long-period gratings with different periods connected by a coupler, and connected to a broadband light source and spectrometer. Using matrix method to analyze the sensitivity differences of fiber core mode and cladding mode coupling in gratings under different temperature and strain conditions, in order to achieve simultaneous measurement of temperature and strain. The experimental results indicate that within the temperature range of 0 to 100 ℃,the grating wavelength undergoes a red shift, with temperature sensitivities at the troughs Peak1 and Peak2 being 0.512 86 nm/℃ and 0.76143 nm/℃, respectively, after coupling. Under a stress range of 0 to 500 με, the grating wavelength experiences a blue shift, with strain sensitivities at the two troughs being -0.138 57 nm/με and -0.082 29 nm/με..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 44 (2025)
[in Chinese]
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 1 (2025)
Research progress on wavefront aberration correction using Zernike polynomials
LIANG Jingyuan, ZHANG Xinwen, KE Chenghu, and KE Xizheng
When light waves propagate through the atmosphere, they experience varying degrees of wavefront aberration due to turbulence. Adaptive optical systems restore the distorted wavefront to a state close to the ideal light through the principle of phase conjugation, thereby achieving wavefront aberration correction. The loWhen light waves propagate through the atmosphere, they experience varying degrees of wavefront aberration due to turbulence. Adaptive optical systems restore the distorted wavefront to a state close to the ideal light through the principle of phase conjugation, thereby achieving wavefront aberration correction. The low-order modes of Zernike polynomials expanded in a circular domain align with Seidel aberrations, and by generating conjugate phases through specific algorithms, effective wavefront aberration correction can be achieved. This paper systematically elaborates on the theory of Zernike polynomials and two types of adaptive optics systems-wavefront-sensing and wavefront-sensorless approaches. It provides a detailed analysis of the working principles of eight Zernike polynomial-based wavefront aberration correction algorithms and evaluates their correction performance, advantages, and limitations..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 49 (2025)
Design of an odd order orthogonal transform assisted MIMO transceiver based on chaotic encryption
CHANG Xinyu, DENG Tao, and ZHANG Lin
Aiming at the issues of low antenna configuration freedom and insufficient security in underwater visible light multiple-input multiple-output(MIMO) communication systems, a design for an underwater visible light MIMO transceiver assisted by odd-order orthogonal transformation based on chaotic encryption is proposed. FAiming at the issues of low antenna configuration freedom and insufficient security in underwater visible light multiple-input multiple-output(MIMO) communication systems, a design for an underwater visible light MIMO transceiver assisted by odd-order orthogonal transformation based on chaotic encryption is proposed. Firstly, an odd-order orthogonal matrix generation algorithm is introduced to enhance the scalability of underwater visible light communication systems. Secondly, a dual chaotic encryption algorithm is employed to encrypt the transmitted data, improving the information transmission security of underwater visible light communication systems. Simulation results indicate that compared to baseline schemes, this approach offers superior reliability and security performance..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 57 (2025)
50G PON system supporting high-power budget and multi-rate compatibility
WANG Ning, JIA Xiaoshuo, YUAN He, ZHANG Nannan, and LI Junwei
To address the challenges in deploying 50G passive optical network(PON) systems-including the 32 dB power budget requirement, compatibility of 25 Gb/s and 50 Gb/s upstream rates, and coexistence with existing GPON and 10G PON systems，a real-time 50G PON system supporting high-power budget and multi-rate compatibility iTo address the challenges in deploying 50G passive optical network(PON) systems-including the 32 dB power budget requirement, compatibility of 25 Gb/s and 50 Gb/s upstream rates, and coexistence with existing GPON and 10G PON systems，a real-time 50G PON system supporting high-power budget and multi-rate compatibility is proposed. The system introduces low-frequency envelope amplitude modulation in the laser to effectively suppress fiber nonlinear effects caused by high-power transmission. At the optical line terminal(OLT) receiver, dynamic adaptive optical digital signal processing(oDSP) technology collaboratively working with the multi-access control (MAC) layer achieves compatibility for 25 Gb/s and 50 Gb/s upstream rates. Additionally, spatial optical hybrid wavelength-division multiplexing technology enables coexistence of 50G PON with GPON and 10G PON on the same PON port. The experimental results show that the system achieves a 32 dB power budget, meeting the C+ standard. Without additional pilot overhead, 50G PON can coexist and operate collaboratively with existing GPON and 10G PON systems on the same port..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 64 (2025)
Analysis on the survivability resilience of optical fiber communication transmission network
YUAN Haibo, ZHOU Zheng, CHEN Yukai, LIN Keling, YAO Daobao, LI Yunlong, and LIAO Xingfeng
To enhance the survivability resilience of optical fiber communication transmission network in complex adversarial environments, this paper systematically establishes a physical-logical network interdependence model and, for the first time, proposes a four-dimensional survivability resilience evaluation framework incorTo enhance the survivability resilience of optical fiber communication transmission network in complex adversarial environments, this paper systematically establishes a physical-logical network interdependence model and, for the first time, proposes a four-dimensional survivability resilience evaluation framework incorporating vulnerability factors, recovery factors, response time, and restoration time. A quantitative evaluation model is established using data normalization and weighted summation methods. Through empirical analysis of a regional optical fiber communication transmission network, the impacts of primary-backup route planning, response time, and recovery time on survivability resilience metrics are investigated. The results indicate that adopting a load-sharing strategy for primary-backup paths increases the survivability resilience score by 16 points, reducing the response time to 2 minutes improves the score by 5.5 points, while extending the recovery time to 60 minutes decreases the score by 5 points..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 69 (2025)
Multi-target ranging and velocity measurement technology based on microwave photonics
QING Guoneng, ZHU Zhengyuan, ZHU Kangqi, HUA Nan, ZHANG Zhenrong, and ZHENG Xiaoping
To address the issue of false targets in multi-target environments when using multi-chirp linear frequency modulated wave (LFMW) for ranging and velocity measurement, a method based on microwave photonics for multi-target ranging and velocity measurement is proposed. This method uses three frequency bands of LFMW to meTo address the issue of false targets in multi-target environments when using multi-chirp linear frequency modulated wave (LFMW) for ranging and velocity measurement, a method based on microwave photonics for multi-target ranging and velocity measurement is proposed. This method uses three frequency bands of LFMW to measure the target's distance and velocity, and it effectively eliminates false targets by leveraging the invariant features observed across these frequency bands. Additionally, a multi-target ranging and velocity measurement verification system based on microwave photonics has been designed and established. This system not only achieves the aforementioned functions but also integrates a signal processing platform based on field-programmable gate arrays (FPGA) within its architecture. The experimental results show that for simulated echo signals from 10 test targets with the highest speed reaching 6 800 m/s, the system can achieve real-time motion parameter measurements, with maximum ranging and velocity errors of 0.58 m and 24 m/s,.
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 74 (2025)
Multi-channel signal enhancement technology based on microwave photonic phase-stabilized transmission
OUYANG Hong, XIE Shifeng, WANG Xia, ZENG Yongfu, LI Yue, YIN Sijie, DAI Fengyu, YANG Wanli, and YIN Yihui
To address the phase jitter in optical-carried radio frequency signals caused by environmental factors during fiber transmission, which degrades the signal-to-noise ratio after multi-channel coherent superposition, this paper proposes a multi-channel signal enhancement technique based on microwave photonic phase-stabilTo address the phase jitter in optical-carried radio frequency signals caused by environmental factors during fiber transmission, which degrades the signal-to-noise ratio after multi-channel coherent superposition, this paper proposes a multi-channel signal enhancement technique based on microwave photonic phase-stabilized transmission. A phase-stabilized transmission system incorporating phase measurement, control, and adjustment modules is designed, achieving stable radio frequency signal phases through closed-loop measurement and precision regulation (10 ps coarse adjustment and 0.1 ps fine adjustment). A multi-channel transmission system is further constructed to realize coherent superposition of three signals using matched filtering and precise phase synthesis. The experimental results demonstrate power enhancements of 4.5 dB and 5.1 dBm at 1.7 GHz and 2.3 GHz respectively, with signal-to-noise ratio improvements of 2.8 dB and 3.44 dB compared to single-channel transmission..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 81 (2025)
Software gate control scheme for microwave photonic vector network analyzer
WANG Jiahui, CHEN Xiaoen, CHEN Jianping, and WU Guiling
To improve the dynamic range of microwave photonic vector network analyzers (MPVNA) during pulse measurements, a software gate control scheme is proposed. This scheme utilizes the temporarily idle receiving channel to receive a pulse square wave that is sourced from the control signal generated by the pulsed excitationTo improve the dynamic range of microwave photonic vector network analyzers (MPVNA) during pulse measurements, a software gate control scheme is proposed. This scheme utilizes the temporarily idle receiving channel to receive a pulse square wave that is sourced from the control signal generated by the pulsed excitation, thus generating a gate control signal. By using this gate control signal to control the pulse response of the device under test that has been collected, the signal-to-noise ratio and the measurement's dynamic range are effectively improved. The pulse scattering parameters (S-parameters) of a 10 GHz band-pass filter were measured. Experimental results show that under a 1% duty cycle pulsed excitation, the measurement dynamic range with the software gate control applied has increased by approximately 20 dB compared to when no gate control control was used. The S11 and S22 parameter curves measured after gate control processing are also smoother and more stable due to the improvement in the signal-to-noise ratio..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 85 (2025)
Research on transmission characteristics of six core optical fibers assisted by air holes and grooves
SONG Xice, YAN Yupeng, PU Junyu, SUN Hongsen, LIU Kai, LI Changjiang, ZHONG Yuhao, and YU Xianlun
In order to improve the transmission performance of optical fibers, an air holes and grooves six core optical fiber structure was designed. In multi-core optical fibers, each core is surrounded by a layer of low refractive index grooves, with a cladding layer between the core and the grooves, and an air hole auxiliary In order to improve the transmission performance of optical fibers, an air holes and grooves six core optical fiber structure was designed. In multi-core optical fibers, each core is surrounded by a layer of low refractive index grooves, with a cladding layer between the core and the grooves, and an air hole auxiliary structure surrounding the fiber. Based on the coupled-mode theory of optical fibers, an in-depth analysis was conducted on three transmission characteristics: crosstalk, mode field area, and bending loss. The research findings indicate that the fiber with the air holes and grooves structure exhibits the best performance in terms of inter-core crosstalk, achieving a minimum crosstalk value of approximately -55 dB. On the other hand, the single-trench-assisted structure effectively increases the mode field area of the fiber, reaching a maximum value of about 390 μm2. However, the variation in bending loss across different structures does not show a clear pattern, with its logarithmic values concentrated in the range of 4~9 dB/m..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 90 (2025)
Temperature simulation research in space working environment for aerospace optical fiber based on finite element approach
XU Hao, GU Qingchang, YANG Honglun, and GAO Zeren
To evaluate and predict the performance of energy-transmitting aerospace quartz optical fibers in the space working environment (SWE), this study investigates their temperature variations. Using the finite element approach, a thermal simulation model for aerospace optical fibers was designed to analyze temperature chanTo evaluate and predict the performance of energy-transmitting aerospace quartz optical fibers in the space working environment (SWE), this study investigates their temperature variations. Using the finite element approach, a thermal simulation model for aerospace optical fibers was designed to analyze temperature changes under different initial temperatures, multiple working cycles, and various operational stages. Additionally, an 'operation-cooling' alternating working mode for aerospace optical fibers was proposed, considering both general and special working conditions. The experiment result reveals that the optimal mode within the designed modes can reduce the maximum equivalent temperature by 18.85 ℃ and the average equivalent temperature by 18.61 ℃ during operation, significantly enhancing the stability and reliability of aerospace optical fibers..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 95 (2025)
Design of high-power pulsed laser with all-fiber MOPA structure
LI Quanfa, QU Biao, and PAN Shifa
To achieve high-power, multi-parameter tunable nanosecond pulsed laser output based on an all-fiber master oscillator power amplifier(MOPA)structure, a semiconductor laser directly modulated by an electrical circuit is employed as the seed source. A high-power pulsed laser with an all-fiber MOPA structure is designed, To achieve high-power, multi-parameter tunable nanosecond pulsed laser output based on an all-fiber master oscillator power amplifier(MOPA)structure, a semiconductor laser directly modulated by an electrical circuit is employed as the seed source. A high-power pulsed laser with an all-fiber MOPA structure is designed, optimizing the bending radius of the active fiber and the optical path configuration. The experimental results show that when the primary and secondary pump powers are 2.2 W and 34.38 W, respectively, the laser achieves stable output with an average power of 20.85 W, a maximum peak power of 12.9 kW, a central wavelength of 1 064.5 nm, a linewidth of 3.75 nm, and an average beam quality factor M2 of 1.345..
Optical Communication Technology
- Publication Date: Apr. 25, 2025
- Vol. 49, Issue 2, 100 (2025)
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