- 标题
- 摘要
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- 实验方案
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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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Broadband Mode Multiplexer Formed with Non-planar Tapered Directional Couplers
摘要： We propose a broadband mode multiplexer based on the structure of cascaded planar and non-planar tapered directional couplers (DCs), which are designed for processing vertically symmetric and anti-symmetric modes. The DCs are tapered to widen the operating bandwidth, reduce the polarization dependence, and improve the fabrication tolerance. As an example, we design and fabricate a five-mode (de)multiplexer with polymer material to combine or separate the E11, E12, E21, E31, and E22 modes. Our typical fabricated device has a length of 2.1 cm and shows the mode coupling efficiency of almost larger than 94.5% for each DC over the C + L band with weak polarization dependence. The proposed structure is scalable and can be implemented with different material platforms.
关键词： mode multiplexer,Mode-division multiplexing,tapered waveguide,directional coupler,polymer waveguide
更新于2025-09-23 15:22:29
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A new dual band 4 x 4 butler matrix with dual band 3dB quadrature branch line coupler and dual band 45° phase shifter
摘要： A new dual band 4 × 4 butler matrix (BM) without crossover has been proposed, implemented and analyzed in this paper. A new dual band 45° phase shifter has also been proposed. The dual band BM, dual band 3dB quadrature branch line coupler (BLC) and dual band 45o phase shifter have been designed using Keysight Technologies’ Advanced Design System (ADS) software and implemented on the Rogers 2.33, having a thickness of 0.787 mm for 1.0 GHz and 2.5 GHz operating frequencies. Before the implementation of the proposed BM, the dual band 3dB quadrature BLC and dual band 45° phase shifter have been designed, implemented and analyzed. The proposed dual band 4 × 4 BM has been developed by placing four dual band 3dB quadrature BLCs and two dual band 45° phase shifters at their appropriate positions. Circuit parameters variation of the proposed BLC, phase shifter and BM with frequency ratios have been studied in this paper. The measured and simulated results of the dual band BM validated the design methodology. A performance analysis comparing the proposed BM with the existing butler matrices has also been carried out.
关键词： branch line coupler,Butler matrix,dual band,impedance transformer,45o phase shifter,advanced design system
更新于2025-09-23 15:21:21
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Polarization-independent hybrid plasmonic coupler based on T-shaped slot waveguide
摘要： In this paper, a novel polarization-independent hybrid plasmonic coupler based on a T-shaped slot waveguide is proposed and investigated by numerical simulations using the finite element method. The structure supports both the TE-polarized slot waveguide mode and the TM-polarized plasmonic mode, offering a greater possibility to achieve the polarization-independent operation. The simulation results show that with proper structural parameters, the waveguide coupler with high extinction ratios of 31.2 dB (TE) and 30 dB (TM) and low insertion losses of 0.38 dB (TE) and 2.04 dB (TM) can be achieved at a telecommunication wavelength of 1550 nm. An investigation of the influence of structural perturbations indicates that the proposed coupler also has a good tolerance to fabrication errors. The proposed structure has potential applications in the field of subwavelength integrated photonic circuits.
关键词： polarization-independent,hybrid plasmonic coupler,finite element method,T-shaped slot waveguide,photonic integrated circuits
更新于2025-09-23 15:21:01
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Design of silicon waveguide polarization beam splitter based on reversed ?? <i>?2</i> directional coupler
摘要： We report a directional coupler type polarization beam splitter using silicon waveguides designed for 1550–1600 nm wavelengths. The device uses the coupling strength difference between the TE and TM modes. We use a reversed Δβ structure to achieve a wide operational wavelength range. The gap between the waveguides needs to be wide enough to attain a sufficient extinction ratio for the TE mode. Simulation results show that an over 100 nm operational 20 dB extinction ratio wavelength range can be attained at 1520–1620 nm wavelengths by this simple structure. The fabrication width tolerance exceeds 10 nm which is enough for foundry processes.
关键词： polarization beam splitter,silicon waveguide,directional coupler,TE and TM modes,reversed Δβ structure
更新于2025-09-23 15:21:01
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178 fs, 1.2 nJ pulses from an all-polarization maintaining fiber figure 8 laser based on 3 ?? 3 coupler at 1 <i>??</i> m
摘要： We report on an Yb-doped all-polarization maintaining fiber mode-locked laser based on nonlinear-amplifying-loop mirror and 3 × 3 coupler. Thanks to this coupler inducing a non-reciprocal phase-bias, the mode-locked regime can be easily achieved at the high repetition rate of 52 MHz. The cavity delivers an average power of 62 mW corresponding to a pulse energy of 1.2 nJ. We have finally demonstrated an extra-cavity nonlinear spectral stage induced by the propagation along a standard nonlinear fiber. The pulse can be then compressed down to 178 fs via a grating compressor and the corresponding peak power is then around 6 kW.
关键词： 3 × 3 coupler,mode-locked lasers,figure 8
更新于2025-09-23 15:21:01
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Mechanoa??Photonics: Flexible Singlea??Crystal Organic Waveguides and Circuits
摘要： Microfabrication of circuits by combining the mechanical and photonic properties of flexible crystals is imperative for flexible miniature photonic devices. The fundamental understanding of molecular packing and energetics of intermolecular interactions is vital to design crystals with intrinsic flexibility and optical attributes. We present a unique one-dimensional optical waveguiding crystal of dithieno[3,2-a:2′,3′-c]phenazine (1) with high aspect ratio displaying high mechanical flexibility and selective self-absorbance of the blue part of its fluorescence (FL). Though, macrocrystals exhibit elasticity, microcrystals deposited at a glass surface behave incredibly like plastic crystals due to significant surface adherence energy, making them suitable for constructing photonic circuits via micromechanical operation with atomic force microscopy cantilever tip. Phenomenally, the flexible crystalline waveguides display optical path-dependent FL signals at the output termini in both straight and bend configuration suitable for wavelength division multiplexing technologies. A futuristic reconfigurable directional coupler fabricated via micromanipulation by combining two arc-shaped crystals split the optical signal via evanescent coupling and deliver the signals at two output terminals with different split ratios. The presented mechanical micromanipulation technique could also be effectively extended to any flexible crystals to design and carve complex photonic circuits.
关键词： Organic Photonics,Flexible Crystals,Directional Coupler,Optical waveguides,Mechano-photonics
更新于2025-09-23 15:21:01
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Wave Propagation in Randomly Perturbed Weakly Coupled Waveguides
摘要： We present an analysis of wave propagation in a two step-index, parallel waveguide system. The goal is to quantify the effect of scattering at randomly perturbed interfaces between the guiding layers of high index of refraction and the host medium. The analysis is based on the expansion of the solution of the wave equation in a complete set of guided, radiation, and evanescent modes with amplitudes that are random fields, due to scattering. We obtain a detailed characterization of these amplitudes and thus quantify the transfer of power between the two waveguides in terms of their separation distance. The results show that, no matter how small the fluctuations of the interfaces are, they have a significant effect at a sufficiently large distance of propagation, which manifests in two ways: The first effect is well known and consists of power leakage from the guided modes to the radiation ones. The second effect consists of blurring of the periodic transfer of power between the waveguides and the eventual equipartition of power. Its quantification is the main practical result of the paper.
关键词： equipartition of power,random waveguides,power leakage,directional coupler
更新于2025-09-23 15:21:01
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Robust silicon 3-dB coupler using inverse engineering based optimization
摘要： We propose a scheme to optimize the adiabaticity of silicon 3-dB couplers for broadband operation and good fabrication tolerance. We use the invariant based inverse engineering to optimize the system evolution to be as as adiabatic as possible while ensuring that the resulting device parameters are smooth. Using the inverse engineering based optimization, a 125 μm long silicon 3-dB coupler with a maximum imbalance of 0.8 dB from 1.4 to 1.7 μm and good fabrication tolerance is obtained. The optimized waveguide widths and separation are smooth.
关键词： broadband operation,inverse engineering,fabrication tolerance,silicon 3-dB coupler,adiabaticity
更新于2025-09-23 15:21:01