- 标题
- 摘要
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- 实验方案
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Grating coupler with reduced back reflection using λ/4 offset at its grating sub-teeth
摘要： We demonstrate a grating coupler with reduced back reflection on silicon-on-insulator (SOI) platform. Each grating tooth of the grating coupler is uniformly divided into multiple sub-teeth with λ/4 offset between two adjacent sub-teeth, reducing the Fresnel reflection from interfaces between core and cladding materials in transmission direction. The back reflection can be theoretically suppressed from ?12 dB to below ?30 dB for a focusing grating coupler working at TM polarization. Experimental results show that the effect of Fresnel reflection on transmission spectrum of the proposed grating coupler is significantly reduced compared to conventional grating coupler. Furthermore, a microring resonator using the proposed focusing grating coupler to couple light into and out of waveguide is fabricated. The measured spectra show that fluctuations on transmission spectra of the ring resonator are effectively suppressed, especially for the drop-port, a well-shaped resonance peak is clearly observed, making the resonance wavelength easily distinguishable, which is highly required in sensing applications using wavelength interrogation.
关键词： Fresnel reflection,grating coupler,waveguide,ring resonator
更新于2025-09-23 15:23:52
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A Versatile Silicon-Silicon Nitride Photonics Platform for Enhanced Functionalities and Applications
摘要： Silicon photonics is one of the most prominent technology platforms for integrated photonics and can support a wide variety of applications. As we move towards a mature industrial core technology, we present the integration of silicon nitride (SiN) material to extend the capabilities of our silicon photonics platform. Depending on the application being targeted, we have developed several integration strategies for the incorporation of SiN. We present these processes, as well as key components for dedicated applications. In particular, we present the use of SiN for athermal multiplexing in optical transceivers for datacom applications, the nonlinear generation of frequency combs in SiN micro-resonators for ultra-high data rate transmission, spectroscopy or metrology applications and the use of SiN to realize optical phased arrays in the 800–1000 nm wavelength range for Light Detection And Ranging (LIDAR) applications. These functionalities are demonstrated using a 200 mm complementary metal-oxide-semiconductor (CMOS)-compatible pilot line, showing the versatility and scalability of the Si-SiN platform.
关键词： transceiver,silicon photonics,Kerr nonlinearity,optical phased array,Coarse Wavelength Division Multiplexing (CWDM),multiplexing,LIDAR,silicon nitride,beam steering,frequency comb,grating coupler
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE 15th International Conference on Group IV Photonics (GFP) - Cancun (2018.8.29-2018.8.31)] 2018 IEEE 15th International Conference on Group IV Photonics (GFP) - Novel Fiber Alignment Method for On-Wafer Testing of Silicon Photonic Devices with PN Junction Embedded Grating Couplers
摘要： We propose a new fiber alignment method using a PN junction embedded grating coupler (GC). It enables us to quickly and easily search the optimum position for optical coupling between the GC and an optical fiber, enabling efficient on-wafer testing.
关键词： fiber alignment,on-wafer testing,photodiode,grating coupler
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE 15th International Conference on Group IV Photonics (GFP) - Cancun (2018.8.29-2018.8.31)] 2018 IEEE 15th International Conference on Group IV Photonics (GFP) - Novel Quick and Precise Method for Evaluating Optical Characteristics
摘要： We describe a new test element and method for evaluating optical characteristics such as a propagation loss. The test element is simply composed of a grating coupler, an interferometer, and an integrated photodetector. The propagation loss is accurately derived by a few elements. This method has potential for drastically reducing measurement time in wafer-level inspection.
关键词： on-wafer testing,propagation loss,grating coupler,photodetector
更新于2025-09-23 15:22:29
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Efficient polymer waveguide grating coupler with directionality enhancement
摘要： Polymer is viewed as an ideal platform for integrated photonics sensing. We propose a polymer waveguide grating coupler with the enhancement of directionality. A gold film mirror beneath the grating coupler is introduced to prevent the power leakage into the substrate. A Bragg grating reflector in series with the coupler is adopted to reverse the forward diffraction light. The finite-difference time-domain method is used to theoretically investigate the dimensional parameters of grating coupler, gold film mirror, as well as the grating reflector. With both two methods, an enhanced coupling efficiency of 51.31 % can be obtained at the wavelength of 1550 nm. The 62-nm wide 1-dB bandwidth covers the C-band. The proposed design has potentials in integrated optical circuit and monolithic integrated sensors.
关键词： Polymer,Grating coupler,Bragg grating,Waveguide
更新于2025-09-23 15:19:57
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[IEEE 2019 International Conference on Smart Systems and Inventive Technology (ICSSIT) - Tirunelveli, India (2019.11.27-2019.11.29)] 2019 International Conference on Smart Systems and Inventive Technology (ICSSIT) - Modelling of Grating based waveguide structures for Wavelength Division Multiplexing
摘要： The ability of grating based optical waveguide structures for Wavelength Division Multiplexing is demonstrated. In addition to the conventional function of an input grating coupled waveguide to couple an incident surface beam from an optical source like an optical ?ber into a planar waveguide, a modi?ed design to have a predetermined wavelength multiplexing response has been modelled and analysed. The structure is designed for 1550 nm wavelength and the separation between the wavelengths obtained is 10 nm. An improved waveguide structure of apodized grating pro?le along the waveguide is modelled for 1310 nm operation. There is a signi?cant increase in the number of channels with an improved channel bandwidth.
关键词： Grating coupler,optical waveguide,wavelength division multiplexing
更新于2025-09-19 17:13:59
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Application of Micro-Nano Grating in Photonic Regulation
摘要： Micro-nano gratings have become an important research direction of integrated optics because of its simple structure, easy integration, and multi-functionality. This paper introduces the research status of micro-nano gratings in the field of photon regulation, and provides reference for the development of the industry.
关键词： Grating reflector,Micro-nano grating,Grating filter,Grating coupler
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Low Polarization Dependent Loss Two-Dimensional Grating Coupler
摘要： We design and demonstrate a two-dimensional grating coupler (2D GC) with a low polarization dependent loss (PDL) based on the silicon-on-insulator (SOI) platform. Using an elliptical-like etching pattern consisting of two identical semicircles and a rectangle embedded between them, a maximum PDL of the fabricated device is measured to be 0.2 dB covering the C-band, lower than that of most conventional 2D GCs. Besides, a large feature size of 280 nm is beneficial to its manufacturing process and wide application.
关键词： grating coupler,large feature size,low polarization dependent loss
更新于2025-09-16 10:30:52
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Fabrication tolerance analysis of grating couplers between optical fibers and silicon waveguide
摘要： The grating structure and its performance for coupling between fiber and silicon-based waveguide are studied and analyzed. The coupling mechanism is illustrated through the grating Bragg diffraction condition, and the effect of physical parameters and alignment parameters of the grating coupler on the coupling efficiency is analyzed by FDTD (Finite-difference time-domain). The optimum design values of the period, duty cycle, etching depth and alignment parameters of the grating coupler are obtained, and at the same time, the deviation analysis on the optimal size is carried out. We present high-efficiency grating couplers fabricated both in EBL (Electron Beam Lithography) and Deep Silicon Etching through process optimization on device dimension, which can be useful for grating coupler fabrication.
关键词： Tolerance analysis,Coupling efficiency,Grating coupler,Silicon-on-Insulator
更新于2025-09-16 10:30:52
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Steering Second Harmonic Beam in Nanophotonic Waveguides by Gratings
摘要： Efficient manipulation of the wavefront at the nanoscale is important for optical beaming, signal encoding, and nonlinear phase matching, etc. Diffraction gratings are widely adapted for the control of the wavefront of lightwaves, but predominantly in linear optics. Here, we demonstrated the flexible steering of the second harmonic (SH) beams in nanophotonic waveguides using gratings. The emission angle of the SH signals can be shifted by an amount of 60° from the waveguide axis into the collection cone, allowing the detection of the otherwise undetectable SH from co-propagating waveguide modes in the high-loss waveguides. The SH conversion efficiency (3 × 10?5 W?1) from co-propagating modes contributes up to 26.7% of the total SH signal. As the pump wavelength varies from 770 to 840 nm, the SH beam is swept by up to 22°. This design functions as a nonlinear grating coupler for nanophotonic systems and could be used for efficient nonlinear coherent light generation and integrated nonlinear nanophotonics.
关键词： Fourier imaging,nanophotonics,second harmonic generation,nonlinear grating coupler,beam steering
更新于2025-09-11 14:15:04