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- 摘要
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- 实验方案
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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) - Five-port non-blocking silicon optical router based on mode-selective property
摘要： We propose and demonstrate a five-port optical router based on mode-selective property. It utilizes modes as labels to distinguish its routing paths. The optical signal-to-noise ratios for all paths are larger than 16.3 dB.
关键词： Optical interconnect,Silicon photonics,mode-division multiplexing,optical switching
更新于2025-09-16 10:30:52
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - Mode-Division Multiplexed PAM-4 Signal Transmission in a Silicon Photonic Chip
摘要： Emerging 5G mobile networks and cloud computing applications are driving the demand for an ever-increasing capacity for short-reach optical communications. To meet this demand, mode-division multiplexing (MDM) is being employed to scale up the bandwidth capacity by leveraging the spatial modes of an optical waveguide for transmitting multiple optical signals. On the other hand, the use of PAM-4 can also increase the transmission bandwidth since PAM-4 offers four amplitude levels in a symbol and thus its bit rate is twice as high as OOK at a same baud rate. Therefore, on-chip MDM with PAM-4 is an approach to enhance the transmission capacity in a photonic integrated circuit. In this paper, we report a photonic integrated four-channel MDM circuit that is implemented on a silicon platform with a small size and low channel crosstalk. By using the MDM circuit, a 80 Gbit/s mode-division multiplexed PAM-4 signal transmission is experimentally demonstrated. The advantage of the approach is that high data capacity on-chip communications is enabled by the photonic integrated MDM circuit with a small footprint. The MDM circuit can be employed in a radio over fiber (RoF) system to increase the data transmission capacity of the RoF link.
关键词： PAM-4,silicon photonics,mode-division multiplexing
更新于2025-09-16 10:30:52
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[IEEE 2019 Workshop on Recent Advances in Photonics (WRAP) - Guwahati, India (2019.12.13-2019.12.14)] 2019 Workshop on Recent Advances in Photonics (WRAP) - Commercial DVDs loaded with Femtosecond Laser Prepared Gold Nanoparticles as SERS Substrates
摘要： A source-synchronous interconnect using mode-division multiplexing (MDM) for potential use in on-chip applications is experimentally demonstrated using a 3-mode 750 μm Silicon photonics structure. Results are presented for simultaneous transmission of two data channels on two separate modes (bit error rate < 10?12 at 10 Gb/s) sampled by an optically forwarded clock sent on a third separate mode. Performance assessment of the mode assignment for the clock is presented. The investigation shows that an optimum clock placement is important at wavelengths where modal crosstalk is higher. For example, at 1553 nm, the clock’s jitter decreases from 45 ps down to 2.7 ps where the clock is encoded on a mode with high crosstalk (?18.6 dB) to one that has less crosstalk (?28.6 dB). At 1560 nm where modal crosstalk is better, the clock’s jitter is 2.6 ps (?27.8 dB crosstalk) and 1.1 ps (?34 dB crosstalk) without and with optimum clock placement, respectively. With proper clock to mode assignment, the optical interconnect becomes functional across an optical bandwidth of 11 nm enabling MDM–wavelength-division multiplexing architectures.
关键词： optical interconnects,mode-division multiplexing,source-synchronous links,Integrated optics
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Investigation of Grating Assisted Mode-Selective Few-Mode Fused Fiber Couplers
摘要： Spatial division multiplexing (SDM) in form of mode division multiplexing (MDM) is one solution to keep up with the increasing data traffic demand [1]. MDM is based on using individual modes of a few-mode or multi-mode fiber as individual transmission channels and requires the addressing of individual modes at the input and output of the multimode fiber link. Here, among others, mode-selective fused fiber couplers based on evanescent coupling can be applied for addressing individual modes of fiber optic transmission links. In this case, light coupling occurs when the mode propagation constants are equal and this can be achieved e.g. by applying grating structures and, thus, compensate for the mismatch of the propagation constants of the modes to be coupled [2]. In this work, we will present our latest efforts towards the development of grating assisted mode-selective fused fiber couplers. In order to realize these, the fabrication process is divided into two steps. First, the asymmetric fused fiber couplers are fabricated by using an etching, fusing and tapering process of a step index single-mode (sm) fiber from Fibercore SM1500 (4.2/125) and a four mode step index few-mode (fm) fiber from OFS. The cross-section of a fabricated asymmetric fused fiber coupler with a parabolic shape at the taper waist is shown in Fig. 1a. Following this step the grating structure is inscribed into the core of the sm fiber using the amplitude mask method. The grating structure is applied in order to obtain mode-selective light coupling between the sm and fm fibers. The amplitude mask method for inscribing the grating structure is realized by using a bronze foil mask (Optofab) and a KrF-excimer laser (Atlex FBG, ATL Lasertechnik). Moreover, the process parameters (repetition rate, pulse energy and exposure time) are taken from previous investigations of inscribing LPGs into the highly germanium doped sm fiber [3]. In order to determine the required grating period for mode selective light coupling a CAD model was designed in RSOFT. The model takes the fiber parameters as well as the heating zone, the fiber extension and the degree of fusion (DOF) of the coupler fabrication process into account. In Fig. 1b an illustration of the CAD model of the fabricated asymmetric fused fiber coupler is shown. To determine the required grating period for mode-selective light coupling and to simulate the performance of the grating assisted mode-selective fiber coupler the beam propagation method was applied (BeamPROP-toolbox in RSOFT). As illustrated in Fig. 1c, mode-selective light coupling can be obtained between the LP11 mode of the fm fiber and the LP01 mode of the sm fiber for a grating period of 500 μm.
关键词： fused fiber couplers,mode division multiplexing,few-mode fiber,grating structures,spatial division multiplexing
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE Photonics Conference (IPC) - San Antonio, TX, USA (2019.9.29-2019.10.3)] 2019 IEEE Photonics Conference (IPC) - Shaping Optical Fibers to Mode Division Multiplex without MIMO
摘要： MIMO complexity can be reduced or avoided completely by proper design of the few mode optical fiber used for mode division multiplexing. Our focus is high index contrast fibers that avoid the formation of scalar modes, to favor vector modes with more limited modal interactions.
关键词： SDM,orbital angular momentum,OAM,spatial division multiplexing,MDM,mode division multiplexing
更新于2025-09-11 14:15:04
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Pancharatnam–Berry Optical Elements for Spin and Orbital Angular Momentum Division Demultiplexing
摘要： A Pancharatnam–Berry optical element is designed, fabricated, and optically characterized for the demultiplexing of beams with different polarization and orbital angular momentum states at the telecom wavelength of 1310 nm. The geometric phase control is achieved by fabricating properly-oriented subwavelength gratings on a silicon substrate, inducing a spatially-variant form birefringence. The digital grating pattern is transferred to the silicon substrate with a two-step nanofabrication protocol, using inductively coupled plasma reactive ion etching to transfer the resist pattern generated with high-resolution electron beam lithography. The optical characterization of the sample confirms the expected capability to sort circularly polarized optical beams with different handedness and orbital angular momentum. Encompassing optical element design and silicon photonics, the designed silicon metasurface paves the way to innovative devices for total angular momentum mode division multiplexing with unprecedented levels of integration.
关键词： subwavelength gratings,electron beam lithography,metasurfaces,silicon,orbital angular momentum,reactive ion etching,mode division multiplexing,polarization division multiplexing,Pancharatnam–Berry optical elements
更新于2025-09-10 09:29:36
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Three-mode multiplexer and demultiplexer utilizing trident and multimode couplers
摘要： In this paper, a simultaneous three-mode silicon (de)multiplexer using a trident coupler and a 3×3 multimode interference (MMI) is presented. The fundamental (TE0), first-order (TE1), and second-order (TE2) modes at the input are successfully demultiplexed and converted to three uniform fundamental modes (TE0) at the output ports. The device is designed and optimized by numerical simulation using three-dimensional beam propagation method together with effective index method. The three-mode (de)multiplexing is achieved over the whole C-band with small insertion loss (<0.9 dB) and crosstalk (<?17 dB). The proposed device also features with a small footprint (5 μm×400 μm) and a large fabrication tolerance against chip-size variations while maintaining the desired optical performance.
关键词： silicon photonics,Mode-division multiplexing,Y-junction coupler,planar lightwave circuits,mode conversion,multimode interference coupler
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 7th International Conference on Photonics (ICP) - Langkawi, Malaysia (2018.4.9-2018.4.11)] 2018 IEEE 7th International Conference on Photonics (ICP) - Design of a Grating Assisted Mode-Division Multiplexer
摘要： This paper presents design of a grating assisted mode-division multiplexer in silicon slab waveguide with 5 mode channels using coupled mode theory and transfer matrix method.
关键词： mode-division multiplexing,co-directional coupling,coupling length,contra-directional coupling,grating
更新于2025-09-09 09:28:46
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High dispersion four-mode fiber for mode-division multiplexing systems
摘要： This paper presents a novel dispersions equalization technique for multilayer core four-mode fiber using LP mode-matrix method. Each of the core ring radius of the alternating center-high (CH) and center-low (CL) index profile was optimized to a specific thickness value. The core ring radius varied in each case to determine the optimized thickness (OPT) for the dispersions equalization. The OPT of the center high index core fiber (CH) denoted by R1, R2, and R3 were found to be 4.25 μm, 2.6 μm, and 2.3 μm, respectively. Similarly, an OPT of the center low index core fiber (CL) which was denoted by X1, X2, X3, and X4 was found to be 2.0 μm, 3.0 μm, 4.20 μm and 1.60 μm, respectively. At 1.55 μm wavelength, these values were used to model the two fibers to achieve an equalized modal dispersion. It is the first time, to our knowledge, a core-ring radius of a CH, and CL index profile varied to a certain OPT value to achieve dispersion equalization. Fabrication challenges were also discussed in this paper.
关键词： mode division multiplexing,Optical fiber,dispersion tolerance,dispersion
更新于2025-09-09 09:28:46
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Reconfigurable On-Chip Mode Exchange for Mode-Division Multiplexing Optical Networks
摘要： Data exchange plays a key role in enhancing network resources utilization and optimizing network performance. In this paper, a data exchange device based on mode-division multiplexing (MDM) technology is proposed and demonstrated, which is capable of exchanging data information between a fundamental mode (TE0) signal and an arbitrary high-order mode (TEx) signal. We experimentally demonstrate the exchange between a TE0 mode signal and a TE1 mode signal using single microring resonator. The insertion loss is about 7.5 dB including terminal coupling loss, the extinction ratio is more than 20 dB within the C band. The crosstalk for the TE1-to-TE0 and TE0-to-TE1 mode conversions is measured to be less than -22 dB and -16 dB, respectively. Clear and open eye diagrams of two different wavelength signals at 10 Gb/s are obtained. The proposed scheme is expected to be used for on-chip MDM networks in future due to its scalability, compact size and low power consumption.
关键词： photonic integrated circuits,microring resonator (MRR),Silicon photonics,mode-division multiplexing,integrated optics
更新于2025-09-09 09:28:46