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Characterizing the thermo-optic coefficient of gallium phosphide-on-insulator platform using high-quality ring resonators

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Applied Physics Letters 2025年第16期126卷

作者： Cheng, Weiren Ding, Ning Zhang, Xucheng Liu, Zhenyu Tang, Xingyu Lin, Wenfu Wang, Yifan Pan, Ziyu Bu, Naiqin You, Mingjian Ji, Xingchen Li, Yi Zhao, Qiancheng School of Microelectronics MOE Engineering Research Center of Integrated Circuits for Next Generation Communications Southern University of Science and Technology Guangdong Shenzhen518000 China John Hopcroft Center for Computer Science School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

Characterizing a material's thermo-optic coefficient lays the foundation for optimizing thermal tuning of photonic integrated devices, a key feature for applications in optical communication, sensing, and signal processing. Unlike traditional bulk measurements, determining the thermo-optic coefficient (TOC) in microscale photonic devices offers significant advantages in data processing and provides more direct relevance to real-world device performance. In this work, we characterize the TOC of gallium phosphide (GaP) films using an air-cladded ring resonator, built on a GaP-on-insulator (GaP-OI) architecture. The resonator is fabricated via an optimized "etch-n-transfer" process, which incorporates silicon dioxide hard masks to enhance the precision of pattern transfer and improve the waveguide surface cleanliness, reducing defects and ensuring better device performance. The fabricated resonator exhibits a loaded quality factor of (2.18 ± 0.1)×104 at 1550 nm by using contact lithography, with a waveguide propagation loss of 23.8 ± 0.3 dB/cm. At 780 nm, the propagation loss decreases to 16.7 dB/cm. The resonator also shows a temperature-dependent wavelength shift of 65.8 pm/K, allowing us to extract a TOC of 1.19 × 10−4/K for GaP. This high temperature sensitivity empowers the GaP-OI platform particularly well-suited for rapid thermal turning, which is beneficial for a range of applications including optical sensing, optical signal processing, and highly efficient nonlinear conversion. © 2025 Author(s).

关键词： Surface cleaning

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On-chip silicon photonic 2 × 2 mode-and polarization-selective switch with low inter-modal crosstalk

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Photonics Research 2017年第5期5卷 512-517页

作者： YONG ZHANG YU HE QINGMING ZHU CIYUAN QIU YIKAI SU State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University

Mode-and polarization-division multiplexing offer new dimensions to increase the transmission capacity of optical communications. Selective switches are key components in reconfigurable optical network nodes. An on-chip silicon 2 × 2 mode-and polarization-selective switch that can route four data channels on two modes and two polarizations simultaneously is proposed and experimentally demonstrated for the first time, to the best of our knowledge. The overall insertion losses are lower than 8.6 d B. To reduce the inter-modal crosstalk, polarization beam splitters are added to filter the undesired polarizations or modes. The measured inter-modal andintra-modal crosstalk values are below-23.2 and-22.8 d B for all the channels, respectively.

关键词： mode-and polarization-selective switch with low inter-modal crosstalk On-chip silicon photonic 2 MZI

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Visibility in magnetostrictive fiber-optic interferometric sensors and its dependence on the input SOP

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Chinese Optics Letters 2006年第1期4卷 15-17页

作者：施长海陈建平李新碗叶爱伦周俊鹤张翼薛青洪琳 The State Key Laboratory on Fiber-Optic Local Area Network and Advanced Optical Communication Systems Shanghai Jiao Tong UniversityShanghai 200030

The visibility in magnetostrictive fiber-optic interferometric sensors using a Gaussian laser beam is analyzed. It is shown that the conventional Gaussian laser beam has little influence on the visibility. The visibility depends strongly on the input state of polarization （SOP）. We implement a cylindrical transducer and build a measurement setup with a polarization controller. The visibility dependent on the SOP of input light is measured. The estimated values are similar to the experiment results, which verifies the analysis.

关键词： Laser beams Light polarization Magnetic field measurement Magnetostrictive devices Phase shift Sensitivity analysis Single mode fibers Visibility

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Fabrication and application of a graphene polarizer with strong saturable absorption

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Photonics Research 2016年第2期4卷 41-44页

作者： Weixiong Li Lilin Yi Ran Zheng Zhenghua Ni Weisheng Hu The State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Department of Physics Southeast University

By transferring 100 nm gold-coated CVD monolayer graphene onto the well-polished surface of D-shaped fiber, we achieve a graphene in-line polarizer with a high polarization extinction ratio of ~27 d B and low insertion loss of 5 d B at 1550 nm, meanwhile achieving a strong saturable absorption effect of 14%. The manufacture of this graphene in-line polarizer also simplifies the graphene transfer process. To explore the potential applications of the new device, we also demonstrate noise-like pulse generation and supercontinuum spectrum generation. By launching the designed graphene device into a fiber ring laser cavity, 51 nm bandwidth noise-like pulse is obtained. Then, launching the high-power noise-like pulse into high nonlinear fiber, a 1000 nm wide supercontinuum spectrum is obtained, which is favorable for sensing and nonlinearities scientific fields.

关键词： Fabrication and application of a graphene polarizer with strong saturable absorption mode PDL

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Novel WDM-PON architecture for simultaneous transmission of unicast data and multicast services

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Chinese Optics Letters 2010年第10期8卷 972-975页

作者：朱敏肖石林郭薇胡卫生 Benoit Geller State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Lab of Electronics and Computer Engineering ENSTA ParisTech

We propose a novel wavelength-division multiplexed passive optical network （WDM-PON） to simultaneously transmit unicast data and multicast services with upstream data re-modulation in optical network units （ONUs）. For each wavelength channel in the optical line terminal （OLT）, the downstream unicast data are applied to one arm of a dual-parallel Mach-Zehnder modulator （DPMZM） to generate baseband unicast non-return-to-zero （NRZ） signal. A radio frequency （RF） control signal is applied to the other arm to present two un-modulated sidebands for multicast data modulation in a differential phase-shift keying （DPSK） format. The flexible and dynamic multicast services are realized by simply switching the RF control signal on or off. The proposed scheme is experimentally demonstrated with 1.25-Gb/s downstream unicast, multicast, and upstream data.

关键词： Fiber optic networks Light modulators Multicasting Wavelength division multiplexing

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Learnable digital signal processing:a new benchmark of linearity compensation for optical fiber communications

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Light(Science & Applications) 2024年第9期13卷 1931-1943页

作者： Zekun Niu Hang Yang Lyu Li Minghui Shi Guozhi Xu Weisheng Hu Lilin Yi State Key Lab of Advanced Optical Communication Systems and Networks School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240PR China

The surge in interest regarding the next generation of optical fiber transmission has stimulated the development of digital signal processing(DSP)schemes that are highly cost-effective with both high performance and low *** benchmarks for nonlinear compensation methods,however,traditional DSP designed with block-by-block modules for linear compensations,could exhibit residual linear effects after compensation,limiting the nonlinear compensation *** we propose a high-efficient design thought for DSP based on the learnable perspectivity,called learnable DSP(LDSP).LDSP reuses the traditional DSP modules,regarding the whole DSP as a deep learning framework and optimizing the DSP parameters adaptively based on backpropagation algorithm from a global *** method not only establishes new standards in linear DSP performance but also serves as a critical benchmark for nonlinear DSP *** comparison to traditional DSP with hyperparameter optimization,a notable enhancement of approximately 1.21 dB in the Q factor for 400 Gb/s signal after 1600 km fiber transmission is experimentally demonstrated by combining LDSP and perturbation-based nonlinear compensation *** from the learnable model,LDSP can learn the best configuration adaptively with low complexity,reducing dependence on initial *** proposed approach implements a symbol-rate DSP with a small bit error rate(BER)cost in exchange for a 48%complexity reduction compared to the conventional 2 samples/symbol *** believe that LDSP represents a new and highly efficient paradigm for DSP design,which is poised to attract considerable attention across various domains of optical communications.

关键词： fiber signal optical

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Hybrid WDMA/OCDM system with the capability of encoding multiple wavelength channels by employing one encoder and one corresponding optical code

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Chinese Optics Letters 2010年第8期8卷 745-748页

作者：陈荷肖石林朱敏史杰毕美华 State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University School of Information Science and Engineering Xinjiang University

A hybrid wavelength division multiple access （WDMA）/optical code division multiplexing （OCDM） system is proposed, where the optical code is not the same as the address of every optical network unit （ONU）; rather, the code is a virtual fiber of hybrid passive optical network （PON）. To our knowledge, this is the first report analyzing a single encoder/decoder with a single corresponding optical code being exploited to encode/decode multiple wavelength signals simultaneously. This system enables OCDM to become transparent to ONU so that the existing wavelength division multiplexing （WDM） PON can be upgraded. Thus, redesigning the optical line terminal and ONU can be easily accomplished, and greatly decreasing the number of encoder/decoder becomes possible. In experiment, we only employ two encoder/decoder pairs to combine two WDM-PONs in one fiber. Simulation results confirm the feasibility of the proposed system.

关键词： Code division multiple access Encoding (symbols) Fiber optic networks Multiplexing equipment optical communication Wavelength division multiplexing

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All-optical modulator based on a ferrofluid core metal cladding waveguide chip

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Chinese Physics B 2013年第9期22卷 470-473页

作者：韩庆邦殷澄李建汤一彬单鸣雷曹庄琪 Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai University Department of Physics State Key Lab of Advanced Optical Communication Systems and NetworksShanghai Jiao Tong University

We propose a novel optical intensity modulator based on the combination of a symmetrical metal cladding optical waveguide （SMCW） and ferrofluid, where the ferrofluid is sealed in the waveguide to act as a guiding layer. The light matter interaction in the ferrofluid film leads to the formation of a regular nanoparticle pattern, which changes the phase match condition of the ultrahigh order modes in return. When two lasers are incident on the same spot of the waveguide chip, experiments illustrate all-optical modulation of one laser beam by adjusting the intensity of the other laser. A possible theoretical explanation may be due to the optical trapping and Soret effect since the phenomenon is considerable only when the control laser is effectively coupled into the waveguide.

关键词： symmetrical metal cladding waveguide chip ultrahigh order modes ferrofluids all-optical devices

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Fault-Tolerant policies for optical grid

Fault-Tolerant policies for optical grid

引用

network Architectures, Management, and Applications VI

作者： Guo, Wei Jin, Yaohui Sun, Weiqiang Hu, Weisheng State Key Lab on Fiber-Optical Local Area Network and Advanced Optical Communication Systems Shanghai Jiao Tong University Shanghai 200240 China

ISBN: (纸本)9780819473776

optical Grid has been thought as a promising technology to support large-scale data-intensive distributed applications. For such a system with so many heterogeneous resources involved, faults seem to be inevitable. A fault in optical Grid may lead to the failure of the application. Therefore, fault-tolerant policies are necessary to improve the performance of optical Grid and satisfy the SLA requirements of the applications. In this paper, we propose several fault-tolerant policies for optical Grid. The performances of different polices are compared by simulation. © 2008 SPIE.

关键词： Fault tolerance

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Numerical analysis of fiber optical parameter amplifier based on triangular photonic crystal fiber

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Science in China(Series F) 2009年第7期52卷 1272-1277页

作者： SHANG maoi LIU ZengJi YUE Peng CHEN JianPing State Key Laboratory of Integrated Service Network Xidian University Xi'an 710071 China State Key Laboratory on Fiber-Optic Local Area Communication Networks and Advanced Optical Communication Systems ShanghaiJiao Tong University Shanghai 200030 China

Due to triangular photonic crystal fiber （PCF） high nonlinearity and low dispersion slope, using the condition that the different linear phase shift combination must satisfy the phase match, the expressions of gain and bandwidth for one-pump fiber-optic parametric amplifiers （1P-FOPA） based on PCF in the normal and abnormal dispersion regimes are derived respectively. Then, 1P-FOPAs performance comparison among PCF, dispersion-shifted fiber （DSF） and highly nonlinear fibers （HNLF） are carried out by numerical simulations. It is shown that the 1P-FOPA based on triangular PCF can provide higher peak gain over wider bandwidth. When the pump wavelength is at the zero-dispersion wavelength （ZDWL）, about 108.7 nm single-pass gain bandwidth and 91.4 dB peak gain can be obtained; when in the normal dispersion regime and near zero-dispersion wavelength, not less than 46 nm single-pass gain bandwidth 77.1 nm away from pump can be achieved. Finally the influence of dispersion fluctuation is analyzed, and the result shows that the tolerance of the 1P-FOPA based on photonic crystal fiber is better.

关键词： fiber optical parametric amplifier photonic crystal fiber gain bandwidth zero-dispersion wavelength variations

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