Recently,structured light beams have attracted substantial attention in many applications,including optical communications,imaging,optical tweezers,and quantum optics.We propose and experimentally demonstrate a reconf...Recently,structured light beams have attracted substantial attention in many applications,including optical communications,imaging,optical tweezers,and quantum optics.We propose and experimentally demonstrate a reconfigurable structured light beam generator in order to generate diverse structured light beams with adjustable beam types,beam orders,and beam sizes.By controlling the sizes of generated free-space structured light beams,free-space orbital angular momentum(OAM)beams and vector beams are coupled into an air-core fiber.To verify that our structured light generator enables generating structured light with high beam quality,polarization distributions and mode purity of generated OAM beams and vector beams in both free space and air-core fiber are characterized.Such a structured light generator may pave the way for future applications based on higher-order structured light beams.展开更多
Recently,transmitting diverse signals in different cores of a multicore fiber(MCF)has greatly improved the communication capacity of a single fiber.In such an MCF-based communication system,mux/demux devices with broa...Recently,transmitting diverse signals in different cores of a multicore fiber(MCF)has greatly improved the communication capacity of a single fiber.In such an MCF-based communication system,mux/demux devices with broad bandwidth are of great significance.In this work,we design and fabricate a 19-channel mux/demux device based on femtosecond laser direct writing.The fabricated mux/demux device possesses an average insertion loss of 0.88 dB and intercore crosstalk of no more than−29.1 dB.Moreover,the fabricated mux/demux device features a broad bandwidth across the C+L band.Such a mux/demux device enables low-loss 19-core fiber(de)multiplexing over the whole C+L band,showing a convincing potential value in wavelength-space division multiplexing applications.In addition,a 19-core fiber fan-in/fan-out system is also established based on a pair of mux/demux devices in this work.展开更多
The Mathieu beam is a typical nondiffracting beam characterized by its propagation invariance and self-reconstruction.These extraordinary properties have given rise to potentialities for applications such as optical c...The Mathieu beam is a typical nondiffracting beam characterized by its propagation invariance and self-reconstruction.These extraordinary properties have given rise to potentialities for applications such as optical communications,optical trapping,and material processing.However,the experimental generation of Mathieu–Gauss beams possessing high quality and compactness is still challenging.In this work,even and helical Mathieu phase plates with different orders m and ellipticity parameters q are fabricated by femtosecond laser two-photon polymerization.The experimentally generated nondiffracting beams are propagationinvariant in several hundred millimeters,which agree with numerical simulations.This work may promote the miniaturization of the application of nondiffracting beams in micronanooptics.展开更多
Atmospheric turbulence distorts the complex wavefront of light in free-space optical communication systems,leading to bit errors and even communication interruptions.Recently,it is found that the non-separability of v...Atmospheric turbulence distorts the complex wavefront of light in free-space optical communication systems,leading to bit errors and even communication interruptions.Recently,it is found that the non-separability of vectorial structured light remains invariant when transmitting through atmospheric turbulence.This discovery offers a potential solution for turbulence-resilient communications—encoding based on the non-separability of vectorial structured light.To achieve such turbulence-resilient communications,efficient detection of the non-separability of vectorial structured light is essential,which acts as the receivers of such communication systems.So far,traditional non-separability detection schemes usually rely on bulky SLMs or DMDs,facing inherent trade-offs between single-shot capability and system compactness.In addition,the detection of mode-resolved non-separability contributions of vectorial superposition states has not yet been accomplished.Here,we propose and experimentally demonstrate a coherent detector to characterize the non-separability of vectorial structured light based on off-axis digital holography,which overcomes the limitations of traditional approaches by digitally decomposing spatial modes.Our approach may pave the way for turbulence-resilient optical communications based on non-separability coding methods and bring new insights into non-separability measurement.展开更多
Explosive growth in demand for data traffic has prompted exploration of the spatial dimension of lightwaves, which provides a degree of freedom to expand data transmission capacity. Various techniques basedon bulky op...Explosive growth in demand for data traffic has prompted exploration of the spatial dimension of lightwaves, which provides a degree of freedom to expand data transmission capacity. Various techniques basedon bulky optical devices have been proposed to tailor light waves in the spatial dimension. However, theirinherent large size, extra loss, and precise alignment requirements make these techniques relativelydifficult to implement in a compact and flexible way. In contrast, three-dimensional (3D) photonic chips withcompact size and low loss provide a promising miniaturized candidate for tailoring light in the spatialdimension. Significantly, they are attractive for chip-assisted short-distance spatial mode optical interconnectsthat are challenging to bulky optics. Here, we propose and fabricate femtosecond laser-inscribed 3D photonicchips to tailor orbital angular momentum (OAM) modes in the spatial dimension. Various functions on theplatform of 3D photonic chips are experimentally demonstrated, including the generation, (de)multiplexing,and exchange of OAM modes. Moreover, chip-chip and chip–fiber–chip short-distance optical interconnectsusing OAM modes are demonstrated in the experiment with favorable performance. This work paves the wayto flexibly tailor light waves on 3D photonic chips and offers a compact solution for versatile opticalinterconnects and other emerging applications with spatial modes.展开更多
Rotational Doppler effect has made tremendous development in both theoretical and applied research over the last decade.Different from the inertial thinking of focusing on the scalar field dominated by helical phase l...Rotational Doppler effect has made tremendous development in both theoretical and applied research over the last decade.Different from the inertial thinking of focusing on the scalar field dominated by helical phase light,we have revealed a vectorial Doppler effect in our previous work,which is based on the spatially variant polarized light fields to simultaneously acquire the speed and direction of a target.Here,further,we propose a method to construct a flexible and robust velocimeter based on that novel effect by employing an air-core fiber with kilometer-length scale for remotely measuring the vectorial information of angular velocity in situ.In addition,we experimentally substantiate that the measurement system still has commendable accuracy in determining the direction of movement even when the air-core fiber is interfered by the external environment.The demonstrations prove the potential of vectorial Doppler effect in practical scenarios and remote measurements.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.62125503 and 62261160388)the Key R&D Program of Hubei Province of China(Grant Nos.2020BAB001 and 2021BAA024)+3 种基金the Key R&D Program of Guangdong Province(Grant No.2018B030325002)the Shenzhen Science and Technology Program(Grant No.JCYJ20200109114018750)the Open Projects Foundation of State Key Laboratory of Optical Fiber and Cable Manufacture Technology(Grant No.SKLD2201)the Innovation Project of Optics Valley Laboratory(Grant No.OVL2021BG004).
文摘Recently,structured light beams have attracted substantial attention in many applications,including optical communications,imaging,optical tweezers,and quantum optics.We propose and experimentally demonstrate a reconfigurable structured light beam generator in order to generate diverse structured light beams with adjustable beam types,beam orders,and beam sizes.By controlling the sizes of generated free-space structured light beams,free-space orbital angular momentum(OAM)beams and vector beams are coupled into an air-core fiber.To verify that our structured light generator enables generating structured light with high beam quality,polarization distributions and mode purity of generated OAM beams and vector beams in both free space and air-core fiber are characterized.Such a structured light generator may pave the way for future applications based on higher-order structured light beams.
基金supported by the National Natural Science Foundation of China(Grant Nos.62125503 and 62261160388)the Key R&D Program of Hubei Province of China(Grant Nos.2020BAB001 and 2021BAA024)+3 种基金the Key R&D Program of Guangdong Province(Grant No.2018B030325002)the Science and Technology Innovation Commission of Shenzhen(Grant No.JCYJ20200109114018750)the Open Projects Foundation(No.SKLD2201)of State Key Laboratory of Optical Fiber and Cable Manufacture Technology(YOFC)the Innovation Project of Optics Valley Laboratory(Grant No.OVL2021BG004).
文摘Recently,transmitting diverse signals in different cores of a multicore fiber(MCF)has greatly improved the communication capacity of a single fiber.In such an MCF-based communication system,mux/demux devices with broad bandwidth are of great significance.In this work,we design and fabricate a 19-channel mux/demux device based on femtosecond laser direct writing.The fabricated mux/demux device possesses an average insertion loss of 0.88 dB and intercore crosstalk of no more than−29.1 dB.Moreover,the fabricated mux/demux device features a broad bandwidth across the C+L band.Such a mux/demux device enables low-loss 19-core fiber(de)multiplexing over the whole C+L band,showing a convincing potential value in wavelength-space division multiplexing applications.In addition,a 19-core fiber fan-in/fan-out system is also established based on a pair of mux/demux devices in this work.
基金supported by the National Natural Science Foundation of China(Grant Nos.62125503 and 62261160388)the Key R&D Program of Hubei Province of China(Grant Nos.2020BAB001 and 2021BAA024)+3 种基金the Key R&D Program of Guangdong Province(Grant No.2018B030325002)the Science and Technology Innovation Commission of Shenzhen(Grant No.JCYJ20200109114018750)the Innovation Project of Optics Valley Laboratory(Grant No.OVL2021BG004)the Fundamental Research Funds for the Central Universities(Grant No.2019kfyRCPY037).
文摘The Mathieu beam is a typical nondiffracting beam characterized by its propagation invariance and self-reconstruction.These extraordinary properties have given rise to potentialities for applications such as optical communications,optical trapping,and material processing.However,the experimental generation of Mathieu–Gauss beams possessing high quality and compactness is still challenging.In this work,even and helical Mathieu phase plates with different orders m and ellipticity parameters q are fabricated by femtosecond laser two-photon polymerization.The experimentally generated nondiffracting beams are propagationinvariant in several hundred millimeters,which agree with numerical simulations.This work may promote the miniaturization of the application of nondiffracting beams in micronanooptics.
基金supported by the National Key R&D Program of China(2025YFE0102200)National Natural Science Foundation of China(62405233,62125503,62261160388)+4 种基金Fundamental Research Funds for the Central Universities(XJSJ24030)Natural Science Foundation of Hubei Province of China(2023AFA028)Hubei Optical Fundamental Research Center(HBO2025TQ004)the Opening Project of Henan Province Engineering Technology Research Center for Photoelectric Detection and Sensing Integration,Henan Polytechnic University(KF202504)Yize Liang thanks UPOLabs for providing the SLM(HDSLM80R-PLUS).
文摘Atmospheric turbulence distorts the complex wavefront of light in free-space optical communication systems,leading to bit errors and even communication interruptions.Recently,it is found that the non-separability of vectorial structured light remains invariant when transmitting through atmospheric turbulence.This discovery offers a potential solution for turbulence-resilient communications—encoding based on the non-separability of vectorial structured light.To achieve such turbulence-resilient communications,efficient detection of the non-separability of vectorial structured light is essential,which acts as the receivers of such communication systems.So far,traditional non-separability detection schemes usually rely on bulky SLMs or DMDs,facing inherent trade-offs between single-shot capability and system compactness.In addition,the detection of mode-resolved non-separability contributions of vectorial superposition states has not yet been accomplished.Here,we propose and experimentally demonstrate a coherent detector to characterize the non-separability of vectorial structured light based on off-axis digital holography,which overcomes the limitations of traditional approaches by digitally decomposing spatial modes.Our approach may pave the way for turbulence-resilient optical communications based on non-separability coding methods and bring new insights into non-separability measurement.
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.62125503 and 62261160388)the Key R&D Program of Hubei Province of China(Grant Nos.2020BAB001 and 2021BAA024)+2 种基金the Key R&D Program of Guangdong Province(Grant No.2018B030325002)the Shenzhen Science and Technology Program(Grant No.JCYJ20200109114018750)the Innovation Project of Optics Valley Laboratory(Grant No.OVL2021BG004).
文摘Explosive growth in demand for data traffic has prompted exploration of the spatial dimension of lightwaves, which provides a degree of freedom to expand data transmission capacity. Various techniques basedon bulky optical devices have been proposed to tailor light waves in the spatial dimension. However, theirinherent large size, extra loss, and precise alignment requirements make these techniques relativelydifficult to implement in a compact and flexible way. In contrast, three-dimensional (3D) photonic chips withcompact size and low loss provide a promising miniaturized candidate for tailoring light in the spatialdimension. Significantly, they are attractive for chip-assisted short-distance spatial mode optical interconnectsthat are challenging to bulky optics. Here, we propose and fabricate femtosecond laser-inscribed 3D photonicchips to tailor orbital angular momentum (OAM) modes in the spatial dimension. Various functions on theplatform of 3D photonic chips are experimentally demonstrated, including the generation, (de)multiplexing,and exchange of OAM modes. Moreover, chip-chip and chip–fiber–chip short-distance optical interconnectsusing OAM modes are demonstrated in the experiment with favorable performance. This work paves the wayto flexibly tailor light waves on 3D photonic chips and offers a compact solution for versatile opticalinterconnects and other emerging applications with spatial modes.
基金the National Natural Science Foundation of China(NSFC)(62125503,11774116,and 61905081)the Key R&D Program of Hubei Province of China(2020BAB001 and 2021BAA024)+2 种基金the Key R&D Program of Guangdong Province(2018B030325002)the Science and Technology Innovation Commission of Shenzhen(JCYJ20200109114018750)the Fundamental Research Funds for the Central Universities(2019kfyRCPY037).
文摘Rotational Doppler effect has made tremendous development in both theoretical and applied research over the last decade.Different from the inertial thinking of focusing on the scalar field dominated by helical phase light,we have revealed a vectorial Doppler effect in our previous work,which is based on the spatially variant polarized light fields to simultaneously acquire the speed and direction of a target.Here,further,we propose a method to construct a flexible and robust velocimeter based on that novel effect by employing an air-core fiber with kilometer-length scale for remotely measuring the vectorial information of angular velocity in situ.In addition,we experimentally substantiate that the measurement system still has commendable accuracy in determining the direction of movement even when the air-core fiber is interfered by the external environment.The demonstrations prove the potential of vectorial Doppler effect in practical scenarios and remote measurements.
