Pub Date : 2025-03-12DOI: 10.1016/j.optcom.2025.131694
Tao Wei , Zengrun Wen
We propose a method for modulating Bloch oscillations in a synthetic temporal lattice formed by two coupled fiber loops. By periodically altering the coupling coefficient, resembling the behavior of the Su–Schrieffer–Heeger model in a synthetic temporal lattice, the Bloch oscillations are split into multiple oscillations depending on the coupling modulation period. This splitting can be understood in terms of optical tunneling between energy bands in the synthetic temporal lattice. For larger modulation periods, the coupling variations introduce interfaces that generate weak new Bloch oscillations. Furthermore, partially periodic coupling modulations allow for manipulation of the splitting energy, offering control over the number and strength of the oscillations. This approach provides a potential pathway for achieving optical beam splitters based on Bloch oscillations.
{"title":"Modulating number of Bloch oscillations in synthetic temporal lattices","authors":"Tao Wei , Zengrun Wen","doi":"10.1016/j.optcom.2025.131694","DOIUrl":"10.1016/j.optcom.2025.131694","url":null,"abstract":"<div><div>We propose a method for modulating Bloch oscillations in a synthetic temporal lattice formed by two coupled fiber loops. By periodically altering the coupling coefficient, resembling the behavior of the Su–Schrieffer–Heeger model in a synthetic temporal lattice, the Bloch oscillations are split into multiple oscillations depending on the coupling modulation period. This splitting can be understood in terms of optical tunneling between energy bands in the synthetic temporal lattice. For larger modulation periods, the coupling variations introduce interfaces that generate weak new Bloch oscillations. Furthermore, partially periodic coupling modulations allow for manipulation of the splitting energy, offering control over the number and strength of the oscillations. This approach provides a potential pathway for achieving optical beam splitters based on Bloch oscillations.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131694"},"PeriodicalIF":2.2,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-11DOI: 10.1016/j.optcom.2025.131749
Kun Xing , Zhengwei Pan , Haifeng Wang , Yimeng Sang , Yun Zhang , Tao Tao , Zhe Zhuang , Rong Zhang , Bin Liu
This work demonstrated semipolar (11–22) InGaN-based red light-emitting diodes (LEDs) with a peak wavelength of 633.4 nm at 1 A/cm2. We achieved a strain-relaxed semipolar (11–22) GaN template grown on m-plane sapphire substrate by inserting an in-situ SiNx layer. X-ray rocking curve shows that the in-plane anisotropy of the template is reduced compared to those without the SiNx template. At a current density of 1 A/cm2, the semipolar LEDs with the SiNx interlayer exhibit a longer wavelength by 24.4 nm compared to those without the SiNx layer. The external quantum efficiency (EQE) of the semipolar LED peak at 1.65 % when the current density of 4 A/cm2. These findings underscore the potential of utilizing the semipolar (11–22) planes for developing high-performance InGaN-based red LEDs.
{"title":"Demonstration of 633-nm InGaN-based red light-emitting diodes on a semipolar (11–22) GaN template","authors":"Kun Xing , Zhengwei Pan , Haifeng Wang , Yimeng Sang , Yun Zhang , Tao Tao , Zhe Zhuang , Rong Zhang , Bin Liu","doi":"10.1016/j.optcom.2025.131749","DOIUrl":"10.1016/j.optcom.2025.131749","url":null,"abstract":"<div><div>This work demonstrated semipolar (11–22) InGaN-based red light-emitting diodes (LEDs) with a peak wavelength of 633.4 nm at 1 A/cm<sup>2</sup>. We achieved a strain-relaxed semipolar (11–22) GaN template grown on m-plane sapphire substrate by inserting an in-situ SiN<sub>x</sub> layer. X-ray rocking curve shows that the in-plane anisotropy of the template is reduced compared to those without the SiN<sub>x</sub> template. At a current density of 1 A/cm<sup>2</sup>, the semipolar LEDs with the SiN<sub>x</sub> interlayer exhibit a longer wavelength by 24.4 nm compared to those without the SiN<sub>x</sub> layer. The external quantum efficiency (EQE) of the semipolar LED peak at 1.65 % when the current density of 4 A/cm<sup>2</sup>. These findings underscore the potential of utilizing the semipolar (11–22) planes for developing high-performance InGaN-based red LEDs.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131749"},"PeriodicalIF":2.2,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-11DOI: 10.1016/j.optcom.2025.131689
Zian Li , Rui Yang , Changhong Li
We introduce a hybrid graphene-dielectric metasurface that significantly advances biosensing through reconfigurable multipolarization enabled by Fano resonances. The metasurface, consisting of asymmetric silicon rods embedded in CaF2 with a graphene layer, achieves two kinds of orthogonally polarized Fano resonances under linearly polarized electromagnetic wave interactions, generating four distinct polarized modes within a narrow bandwidth. The incorporation of graphene enables precise tuning of Fano resonant frequencies and facilitates switching between linear and circular polarization at a fixed frequency. This dual capability enhances the detection range and sensitivity of polarization sensing by enabling fixed-frequency multipolarization detection, thus allowing ultra-sensitive monitoring of polarization changes. Our approach contrasts with existing methods that utilize different frequencies for multipolarization, marking a significant advancement in the versatility and sensitivity of sensing technologies.
{"title":"Enhanced sensing via multipolarization reconfigurable Fano resonant graphene-dielectric metasurfaces at a fixed frequency","authors":"Zian Li , Rui Yang , Changhong Li","doi":"10.1016/j.optcom.2025.131689","DOIUrl":"10.1016/j.optcom.2025.131689","url":null,"abstract":"<div><div>We introduce a hybrid graphene-dielectric metasurface that significantly advances biosensing through reconfigurable multipolarization enabled by Fano resonances. The metasurface, consisting of asymmetric silicon rods embedded in CaF<sub>2</sub> with a graphene layer, achieves two kinds of orthogonally polarized Fano resonances under linearly polarized electromagnetic wave interactions, generating four distinct polarized modes within a narrow bandwidth. The incorporation of graphene enables precise tuning of Fano resonant frequencies and facilitates switching between linear and circular polarization at a fixed frequency. This dual capability enhances the detection range and sensitivity of polarization sensing by enabling fixed-frequency multipolarization detection, thus allowing ultra-sensitive monitoring of polarization changes. Our approach contrasts with existing methods that utilize different frequencies for multipolarization, marking a significant advancement in the versatility and sensitivity of sensing technologies.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131689"},"PeriodicalIF":2.2,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-10DOI: 10.1016/j.optcom.2025.131746
Xijie Li , Jiating Yang , Ming Gao , Jun Liu , Yunliang Zhu , Siyuan Li
The plane diffraction grating has very high diffraction efficiency, so it is widely used in spectrometers. However, since the principal section of the plane grating does not coincide with the section of the diffracted light, a serious spectral smile occurs, causing deviation in the collected spectral and image information, which affects the imaging spectrometer's detection accuracy for the target signal. To address this issue, a design method of an imaging spectrometer based on forearm compensation optical path multiplexing is proposed in this paper. The forearm compensation lens group generates spectral smile in the opposite direction of to the plane grating to correct the spectral smile of the spectrometer. Moreover, the correction conditions for wide spectrum aberrations are derived based on vector geometric relationships. Based on the proposed design method, we have developed a prototype with a spectral range of 0.45 μm–0.9 μm, a spectral resolution of 6 nm, spectral smile and spectral distortion both less than 2.5 μm, and a volume of approximately 65 mm × 40 mm × 40 mm. Finally, the spectral and imaging performance of the prototype is tested.The test results confirm the feasibility of correcting the spectral smile of an imaging spectrometer and the correctness of the correction conditions for the wide spectrum aberrations based on our proposed design method.
{"title":"The design of an imaging spectrometer based on forearm compensation optical path multiplexing","authors":"Xijie Li , Jiating Yang , Ming Gao , Jun Liu , Yunliang Zhu , Siyuan Li","doi":"10.1016/j.optcom.2025.131746","DOIUrl":"10.1016/j.optcom.2025.131746","url":null,"abstract":"<div><div>The plane diffraction grating has very high diffraction efficiency, so it is widely used in spectrometers. However, since the principal section of the plane grating does not coincide with the section of the diffracted light, a serious spectral smile occurs, causing deviation in the collected spectral and image information, which affects the imaging spectrometer's detection accuracy for the target signal. To address this issue, a design method of an imaging spectrometer based on forearm compensation optical path multiplexing is proposed in this paper. The forearm compensation lens group generates spectral smile in the opposite direction of to the plane grating to correct the spectral smile of the spectrometer. Moreover, the correction conditions for wide spectrum aberrations are derived based on vector geometric relationships. Based on the proposed design method, we have developed a prototype with a spectral range of 0.45 μm–0.9 μm, a spectral resolution of 6 nm, spectral smile and spectral distortion both less than 2.5 μm, and a volume of approximately 65 mm × 40 mm × 40 mm. Finally, the spectral and imaging performance of the prototype is tested.The test results confirm the feasibility of correcting the spectral smile of an imaging spectrometer and the correctness of the correction conditions for the wide spectrum aberrations based on our proposed design method.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131746"},"PeriodicalIF":2.2,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-10DOI: 10.1016/j.optcom.2025.131743
Fu Liao , Guangmang Cui , Weize Cui , Yang Liu , Shigong Shi , Jufeng Zhao , Changlun Hou
Achieving high-quality reconstruction with unknown scattering media and complex scattering conditions, such as low signal-to-noise ratio (SNR) or non-darkroom environments with strong ambient light, remains a significant challenge. Traditional imaging methods have good generalization ability but the fidelity of results needs to be improved, while deep learning methods have good imaging results but limited generalization ability. In order to enhance the generalization ability of the model, improve the reconstruction quality, and achieve robust reconstruction in high-intensity ambient light noise environments, we propose a method based on cascade transfer learning and speckle correlation imaging. Specifically, an innovative and flexible cascade transfer learning architecture is proposed for accurate and robust speckle reconstruction, while the speckle correlation imaging chain is used to generate robust pre-training and fine-tuning datasets, maximizing the advantages of the pre-training and boosting the overall efficacy of transfer learning. Additionally, a degradation-aware Transformer network is designed to achieve better convergence in both pre-training and fine-tuning tasks. Experimental results show that our method outperforms traditional methods and various deep learning-based approaches in both reconstruction fidelity and generalization. Moreover, it can reliably reconstruct targets utilizing low-quality speckles in unfavorable environments, and successfully tackle the challenge of reconstructing highly complex face images through biological tissue, offering new inspiration for scattering imaging.
{"title":"Robust speckle reconstruction based on cascade transfer learning and speckle correlation imaging","authors":"Fu Liao , Guangmang Cui , Weize Cui , Yang Liu , Shigong Shi , Jufeng Zhao , Changlun Hou","doi":"10.1016/j.optcom.2025.131743","DOIUrl":"10.1016/j.optcom.2025.131743","url":null,"abstract":"<div><div>Achieving high-quality reconstruction with unknown scattering media and complex scattering conditions, such as low signal-to-noise ratio (SNR) or non-darkroom environments with strong ambient light, remains a significant challenge. Traditional imaging methods have good generalization ability but the fidelity of results needs to be improved, while deep learning methods have good imaging results but limited generalization ability. In order to enhance the generalization ability of the model, improve the reconstruction quality, and achieve robust reconstruction in high-intensity ambient light noise environments, we propose a method based on cascade transfer learning and speckle correlation imaging. Specifically, an innovative and flexible cascade transfer learning architecture is proposed for accurate and robust speckle reconstruction, while the speckle correlation imaging chain is used to generate robust pre-training and fine-tuning datasets, maximizing the advantages of the pre-training and boosting the overall efficacy of transfer learning. Additionally, a degradation-aware Transformer network is designed to achieve better convergence in both pre-training and fine-tuning tasks. Experimental results show that our method outperforms traditional methods and various deep learning-based approaches in both reconstruction fidelity and generalization. Moreover, it can reliably reconstruct targets utilizing low-quality speckles in unfavorable environments, and successfully tackle the challenge of reconstructing highly complex face images through biological tissue, offering new inspiration for scattering imaging.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131743"},"PeriodicalIF":2.2,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-10DOI: 10.1016/j.optcom.2025.131747
Jinrong Tang , Jie Zhang , Wenfu Liu , Yasha Yi
Silicon nanowires (SiNW) are highly cost-effective and efficient materials, widely applied in solar cells. In this work, we report four-coupled SiNWs (FCNW) for photovoltaic applications. We found that FCNW shows significantly enhanced light absorption compared to single SiNW (SNW) and four-uncoupled SiNWs (FUNW), due to its excellent light-trapping effect. The optimal short-circuit current density of FCNW reaches 14.10 mA/cm2, increasing by 41.71 % and 17.99 % compared to SNW (9.95 mA/cm2) and FUNW (11.95 mA/cm2) respectively. Moreover, coating a non-absorbing dielectric shell (SFCNW) and adjusting its radius can further improve the short-circuit current density. The results show that SFCNW possesses a higher short-circuit current density of 22.19 mA/cm2, enhanced by 123.02 % and 57.38 % relative to SNW and FCNW respectively. Therefore, the SFCNW structure provides a novel approach to improving the photoelectric conversion efficiency of solar cells.
{"title":"Light trapping in four-coupled silicon nanowires for photovoltaic applications","authors":"Jinrong Tang , Jie Zhang , Wenfu Liu , Yasha Yi","doi":"10.1016/j.optcom.2025.131747","DOIUrl":"10.1016/j.optcom.2025.131747","url":null,"abstract":"<div><div>Silicon nanowires (SiNW) are highly cost-effective and efficient materials, widely applied in solar cells. In this work, we report four-coupled SiNWs (FCNW) for photovoltaic applications. We found that FCNW shows significantly enhanced light absorption compared to single SiNW (SNW) and four-uncoupled SiNWs (FUNW), due to its excellent light-trapping effect. The optimal short-circuit current density of FCNW reaches 14.10 mA/cm<sup>2</sup>, increasing by 41.71 % and 17.99 % compared to SNW (9.95 mA/cm<sup>2</sup>) and FUNW (11.95 mA/cm<sup>2</sup>) respectively. Moreover, coating a non-absorbing dielectric shell (SFCNW) and adjusting its radius can further improve the short-circuit current density. The results show that SFCNW possesses a higher short-circuit current density of 22.19 mA/cm<sup>2</sup>, enhanced by 123.02 % and 57.38 % relative to SNW and FCNW respectively. Therefore, the SFCNW structure provides a novel approach to improving the photoelectric conversion efficiency of solar cells.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131747"},"PeriodicalIF":2.2,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-09DOI: 10.1016/j.optcom.2025.131690
Dongping Cheng , Xiujuan Zou , Ruozhang Xing , Mingming Jiang , Caixia Kan , Peng Wan
Metalens-based full-Stokes polarimetry represents a significant technology for compact, real-time polarization detection, which have been validated in various polarization measurements. However, research on fiber-integrated polarimeter compatible with multiple communication wavelengths is relatively scarce, which limits the development of polarization detection in the field of optical communication. Here, we propose a fiber-integrated full-Stokes polarimeter compatible with 850 nm and 1550 nm communication wavelengths. By spatial multiplexing scheme, the metalens resting on a fiber tip effectively separates the polarization states of incident light at dual wavelengths. The device obtains the polarization states by reconstructing Stokes parameters from six polarization components across two focal planes. Furthermore, the measurement precision is evaluated by Stokes errors between reconstructed Stokes parameters and theoretical counterparts. For incident light of various selected polarization states, the reconstructed Stokes parameters closely match the theoretical values, with errors all less than 0.05. Hence, the proposed device adds a wavelength dimension while maintaining high polarization detection accuracy, and its integration with fiber greatly enhances the device’s integration, offering significant potential for polarization detection, imaging, and optical communication.
{"title":"Fiber-integrated full-Stokes polarimeter for dual-wavelength operation at 850 nm and 1550 nm","authors":"Dongping Cheng , Xiujuan Zou , Ruozhang Xing , Mingming Jiang , Caixia Kan , Peng Wan","doi":"10.1016/j.optcom.2025.131690","DOIUrl":"10.1016/j.optcom.2025.131690","url":null,"abstract":"<div><div>Metalens-based full-Stokes polarimetry represents a significant technology for compact, real-time polarization detection, which have been validated in various polarization measurements. However, research on fiber-integrated polarimeter compatible with multiple communication wavelengths is relatively scarce, which limits the development of polarization detection in the field of optical communication. Here, we propose a fiber-integrated full-Stokes polarimeter compatible with 850 nm and 1550 nm communication wavelengths. By spatial multiplexing scheme, the metalens resting on a fiber tip effectively separates the polarization states of incident light at dual wavelengths. The device obtains the polarization states by reconstructing Stokes parameters from six polarization components across two focal planes. Furthermore, the measurement precision is evaluated by Stokes errors between reconstructed Stokes parameters and theoretical counterparts. For incident light of various selected polarization states, the reconstructed Stokes parameters closely match the theoretical values, with errors all less than 0.05. Hence, the proposed device adds a wavelength dimension while maintaining high polarization detection accuracy, and its integration with fiber greatly enhances the device’s integration, offering significant potential for polarization detection, imaging, and optical communication.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131690"},"PeriodicalIF":2.2,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents a cladding waveguide fiber Bragg gratings (CWFBGs) two-dimensional (2D) vector accelerometer in a standard single-mode fiber. The cladding waveguides with large eccentricity are inscribed using the femtosecond laser direct writing technique with a multiple-scan method. Subsequently, FBGs are inscribed into cladding straight waveguides. Experiments were conducted to monitor the variation of the central wavelength of the CWFBGs in response to bending and vibration. The results show that the maximum bending sensitivity is 67.38 pm/m−1 and the maximum acceleration sensitivity is 37.78 pm/g at an offset distance of 45 m. According to the method described above, orthogonal CWFBGs are inscribed at the same position in the single-mode fiber, which overcomes the limitations of the geometry of multi-core fiber (MCF), achieving higher sensitivity than MCF under the same conditions. Additionally, the demodulation of multiple channels does not require a fan-in/fan-out device, reducing the cost of sensing. The findings of this study illustrate that CWFBGs offer highly sensitive 2D vector vibration measurement in a compact form factor, thus holding promising applications in miniaturized vector fiber sensing.
{"title":"Cladding waveguide fiber Bragg grating accelerometer fabricated in single-mode fiber using femtosecond laser direct writing","authors":"Rongsheng Liu, Pengtao Luo, Xingyong Li, Fengyi Chen, Rui Zhou, Xueguang Qiao","doi":"10.1016/j.optcom.2025.131679","DOIUrl":"10.1016/j.optcom.2025.131679","url":null,"abstract":"<div><div>This paper presents a cladding waveguide fiber Bragg gratings (CWFBGs) two-dimensional (2D) vector accelerometer in a standard single-mode fiber. The cladding waveguides with large eccentricity are inscribed using the femtosecond laser direct writing technique with a multiple-scan method. Subsequently, FBGs are inscribed into cladding straight waveguides. Experiments were conducted to monitor the variation of the central wavelength of the CWFBGs in response to bending and vibration. The results show that the maximum bending sensitivity is 67.38 pm/m<sup>−1</sup> and the maximum acceleration sensitivity is 37.78 pm/g at an offset distance of 45 <span><math><mi>μ</mi></math></span>m. According to the method described above, orthogonal CWFBGs are inscribed at the same position in the single-mode fiber, which overcomes the limitations of the geometry of multi-core fiber (MCF), achieving higher sensitivity than MCF under the same conditions. Additionally, the demodulation of multiple channels does not require a fan-in/fan-out device, reducing the cost of sensing. The findings of this study illustrate that CWFBGs offer highly sensitive 2D vector vibration measurement in a compact form factor, thus holding promising applications in miniaturized vector fiber sensing.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131679"},"PeriodicalIF":2.2,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-08DOI: 10.1016/j.optcom.2025.131700
Zhengxuan Li 李正璇, Qinyao Yang 杨勤尧, Yingxiong Song 宋英雄, Acai Tan 谭阿才, Siyu Luo 骆思雨, Bingyao Cao 曹炳尧
As data rates in orthogonal frequency division multiplexing (OFDM) passive optical networks (PONs) exceed 50 Gbit/s, coherent reception emerges as a compelling choice, and managing the wavelength of the local oscillator (LO) laser becomes a key challenge in system design. We propose a colorless coherent OFDM-PON architecture using an optical frequency comb (OFC) at the optical line terminal (OLT), allowing the optical network unit (ONU) laser to drift across the comb bandwidth. Experimental results indicate that the proposed architecture enables colorless reception without performance degradation. Additionally, by applying frequency shifting and combining the received signal, the receiver sensitivity of high-bandwidth receivers can be enhanced by approximately 2 dB.
{"title":"Colorless coherent OFDM-PON based on an optical frequency comb","authors":"Zhengxuan Li 李正璇, Qinyao Yang 杨勤尧, Yingxiong Song 宋英雄, Acai Tan 谭阿才, Siyu Luo 骆思雨, Bingyao Cao 曹炳尧","doi":"10.1016/j.optcom.2025.131700","DOIUrl":"10.1016/j.optcom.2025.131700","url":null,"abstract":"<div><div>As data rates in orthogonal frequency division multiplexing (OFDM) passive optical networks (PONs) exceed 50 Gbit/s, coherent reception emerges as a compelling choice, and managing the wavelength of the local oscillator (LO) laser becomes a key challenge in system design. We propose a colorless coherent OFDM-PON architecture using an optical frequency comb (OFC) at the optical line terminal (OLT), allowing the optical network unit (ONU) laser to drift across the comb bandwidth. Experimental results indicate that the proposed architecture enables colorless reception without performance degradation. Additionally, by applying frequency shifting and combining the received signal, the receiver sensitivity of high-bandwidth receivers can be enhanced by approximately 2 dB.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131700"},"PeriodicalIF":2.2,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-08DOI: 10.1016/j.optcom.2025.131732
Hye-Min Park, Young-Jin Hyun, Sang-Kook Han
With the rapid increase in the deployment of nanosatellites, free-space optical (FSO) communication has become widely utilized to mitigate possible RF interference between inter-satellite links. Failing to optimize the beam for pointing errors during the design phase can result in degraded pointing, acquisition, and tracking (PAT) accuracy or reduced transmission gain. In this study, we analyzed the causes of elliptical pointing errors in nanosatellites and mathematically modeled their elliptical formation. Furthermore, an algorithm for optimizing the beam divergence angle based on given pointing errors is proposed. The proposed algorithm is demonstrated to maximize transmitter gain, enhance the link budget, and significantly improve the performance of optical communication systems. Additionally, the influence of pointing error parameters on the optimization of the beam divergence angle is investigated, providing valuable guidelines for designing optimal beam divergence angles in nanosatellite optical communication systems.
{"title":"Beam divergence angle optimization for the compensation of the elliptical pointing error in nanosatellite optical communication","authors":"Hye-Min Park, Young-Jin Hyun, Sang-Kook Han","doi":"10.1016/j.optcom.2025.131732","DOIUrl":"10.1016/j.optcom.2025.131732","url":null,"abstract":"<div><div>With the rapid increase in the deployment of nanosatellites, free-space optical (FSO) communication has become widely utilized to mitigate possible RF interference between inter-satellite links. Failing to optimize the beam for pointing errors during the design phase can result in degraded pointing, acquisition, and tracking (PAT) accuracy or reduced transmission gain. In this study, we analyzed the causes of elliptical pointing errors in nanosatellites and mathematically modeled their elliptical formation. Furthermore, an algorithm for optimizing the beam divergence angle based on given pointing errors is proposed. The proposed algorithm is demonstrated to maximize transmitter gain, enhance the link budget, and significantly improve the performance of optical communication systems. Additionally, the influence of pointing error parameters on the optimization of the beam divergence angle is investigated, providing valuable guidelines for designing optimal beam divergence angles in nanosatellite optical communication systems.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131732"},"PeriodicalIF":2.2,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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