A5048040187- Optical Network Technologies
- Photonic Crystal and Fiber Optics
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Photonic Crystals and Applications
- Advanced Optical Network Technologies
- Optical Coatings and Gratings
- Plasmonic and Surface Plasmon Research
- Microwave Engineering and Waveguides
- Fern and Epiphyte Biology
- Photorefractive and Nonlinear Optics
- Electromagnetic Simulation and Numerical Methods
- Orbital Angular Momentum in Optics
- Metamaterials and Metasurfaces Applications
- Magneto-Optical Properties and Applications
- Semiconductor Quantum Structures and Devices
- Neural Networks and Reservoir Computing
- Advanced Wireless Communication Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced MEMS and NEMS Technologies
- Electromagnetic Scattering and Analysis
- Non-Destructive Testing Techniques
Hokkaido University
2016-2025
Gorgias Press (United States)
2020
Hokkaido University of Science
2008-2019
Hokkaido Information University
2017-2018
NTT (Japan)
2013-2015
Sapporo University
2007-2015
Osaka Prefecture University
2015
Fujikura (Japan)
2015
Technical University of Denmark
2015
Clemson University
2013
In order to control dispersion and slope of indexguiding photonic crystal fibers (PCFs), a new controlling technique chromatic in PCF is reported. Moreover, our applied design with both ultra-low ultra-flattened wide wavelength range. A full-vector finite element method anisotropic perfectly matched layers used analyze the properties confinement losses number air holes. It shown from numerical results that it possible fourring flattened 0 +/- 0.5 ps/(km.nm) 1.19 m 1.69 range five-ring 0.4 1.23 1.72
A full-vectorial imaginary-distance beam propagation method based on a finite element scheme is newly formulated and effectively applied to investigating the problem of leakage due number arrays air holes in photonic-crystal holey fibers (HFs). In order treat arbitrarily shaped avoid spurious solutions, curvilinear edge/nodal hybrid introduced. Furthermore, evaluate characteristics not only bound modes but leaky HFs, an anisotropic perfectly matched layer also employed as boundary condition...
Multicore fibers (MCFs) are expected as a good candidate for overcoming the capacity limit of current optical communication system. This paper describes recent progress on MCFs space-division multiplexing to be utilized in future large long-distance transmission systems. Tradeoff issue between low crosstalk and high core density is presented prospect large-space multiplicity discussed.
We demonstrate 1.01-Pb/s transmission over 52 km with the highest aggregate spectral efficiency of 91.4 b/s/Hz by using low-crosstalk one-ring-structured 12-core fiber. Our multi-core fiber and compact fan-in/fan-out devices are designed to support high-order modulation formats up 32-QAM in SDM transmission.
A new type of optical fiber called heterogeneous multi-core (heterogeneous MCF) is proposed towards future large-capacity optical-transport networks and the design principle described. In MCF, not only identical but also non-identical cores, which are single-mode in isolation each other, arranged so that cross-talk between any pair cores becomes sufficiently small. As maximum power transferred goes down drastically, more closely packed definite space, compared to a conventional, homogeneous...
A compact two-mode (de)multiplexer (TM-MUX) based on Si nanowire for mode-division multiplexing is designed. The TM-MUX composed of two multimode interference (MMI) waveguides and a butterfly-shape tapered phase shifter between MMI waveguides. Numerical simulations show that the designed device compared with conventional-mode operates as in whole C-band. In addition, we has relatively good fabrication tolerance.
Coupled-mode and coupled-power theories are described for multi-core fiber design analysis.First, in order to satisfy the law of power conservation, mode-coupling coefficients redefined then, closed-form power-coupling derived based on exponential, Gaussian, triangular autocorrelation functions.Using coupled-mode theories, impacts random phase-offsets correlation lengths crosstalk fibers investigated first time.The simulation results good agreement with measurement results.Furthermore, from...
In order to realize fast and accurate estimation of intercore crosstalk in bent multicore fibers (MCFs), an analytical expression the average power-coupling coefficient (PCC) based on exponential autocorrelation function is, for first time, derived, resulting no need heavy numerical computations. It is revealed that, when bending radius large correlation length large, PCC inversely proportional square propagation constant difference Δβ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Coupling characteristics of dual-core photonic crystal fiber (PCF) couplers are evaluated by using a vector finite element method and their application to multiplexer-demultiplexer (MUX-DEMUX) based on PCF is investigated. The for 1.48/1.55-m, 1.3/1.55-m, 0.98/1.55-m, 0.85/1.55-m wavelength MUX-DEMUX designed the beam propagation analysis proposed performed. It shown from numerical results that it possible realize significantly shorter PCFs, compared conventional optical couplers.
Recent progress on numerical modeling methods for photonic crystal fibers (PCFs) such as the effective index approach, basis-function expansion and approach is described. An index-guiding PCF with an array of air holes surrounding silica core region has special characteristics compared conventional single-mode (SMFs). Using a full modal vector model, fundamental PCFs cutoff wavelength, confinement loss, birefringence, chromatic dispersion are numerically investigated.
A new structure of single-polarization single-mode (SPSM) photonic crystal fiber (PCF) is proposed and analyzed by using a full-vector finite element method with anisotropic perfectly matched layers. From the numerical results it confirmed that low-loss SPSM-PCF within wavelengths ranging from 1.48 to 1.6 μm, where only slow-axis mode exists confinement loss less than 0.1 dB/km.
The wavelength dependence and the structural of leakage loss group velocity dispersion (GVD) in air-core photonic bandgap fibers (PBGFs) are numerically investigated by using a full-vector finite element method. It is shown that at least seventeen rings arrays air holes required cladding region to reduce losses level 0.1 dB/km 1.55-microm range even if large diameter pitch ratio 0.9 PBGFs decrease drastically with increasing hole ratio. Moreover, it waveguide GVD slope much larger than those...
In order to simply design a photonic crystal fiber (PCF), we provide numerically based empirical relations for V parameter and W of PCFs only dependent on the two structural parameters - air hole diameter pitch. We demonstrate accuracy these expressions by comparing proposed with results full-vector finite element method. Through can easily evaluate fundamental properties without need numerical computations.
We propose a new structure of highly nonlinear dispersion-flattened (HNDF) photonic crystal fiber (PCF) with coefficient as large 30 W(-1)km(-1) at 1.55 microm designed by varying the diameters air-hole rings along radius. This innovative HNDF-PCF has unique effective-index profile that can offer not only but also flat dispersion slope and low leakage losses. It is shown through numerical results novel microstructured optical small normal group-velocity nearly zero offers possibility...
The present paper describes a novel systematic solution to the problem of controlling chromatic dispersion and slope in photonic crystal fibers (PCFs), using structurally-simple PCF with defected-core. By adjusting size central air-hole defect we can successfully design an ultra-flattened low confinement losses, as well small effective mode area. strategy is based on mutual cancellation between waveguide material dispersions PCF, by varying defected region core. verification property...
The cladding thickness of trench-assisted multi-core fibers was theoretically and experimentally investigated in terms excess losses outer cores.No significant micro-bending loss increase observed on with the about 30 µm.The tolerance for a fiber is larger than that single core fiber.However, will be limited by occurrence cores.The reduction probably around 40 µm loss.The an effective area 110 2 at 1.55 181-µ m diameter realized without any loss.
We realized mode-division multiplexing(MDM) transmission by using orthogonal LP modes with negligible modal crosstalk, for the first time. A 2×10Gbps MDM was achieved over a 10km two-mode fiber sufficiently low power penalty.
We numerically investigate the polarization characteristics of photonic crystal fibers selectively filled with metal wires into cladding air holes, through a full-vector modal solver based on finite-element method (FEM). Firstly, we fundamental coupling properties between core guided light and surface plasmon polaritons (SPPs) excited wire. Secondly, show that can obtain highly polarization-dependent transmission in PCFs by introducing several closely aligned cladding, reveal strongly modes...
A multicore fiber with two-pitch layout is proposed to overcome the trade-off between core number and a cladding diameter of standard hexagonal single-core pitch. fabricated ten-core simultaneously realizes effective area about 120 μm(2) at 1550 nm, small crosstalk, 204 μm. The crosstalk center outer cores 30 dB smaller than that cores. would help keep transmission quality same level as
Based on the overlap integral of electromagnetic fields in neighboring cores, a calculating method is proposed for obtaining coupling coefficient between two adjacent trench-assisted non-identical cores.And kind heterogeneous multi-core fiber (Hetero-TA-MCF) with 12 cores to achieve large effective area (A eff ) and high density cores.As bending radius becomes larger than 50 mm, crosstalk value at 1550-nm wavelength Hetero-TA-MCF about -42 dB after 100-km propagation A this can reach 100 µm 2 .
We demonstrate dense SDM transmission of 20-WDM multi-carrier PDM-32QAM signals over a 40-km 12-core × 3-mode fiber with 247.9-b/s/Hz spectral efficiency. Parallel MIMO equalization enables 21-ns DMD compensation 61 TDE taps per subcarrier.
The length dependence of the crosstalk in multi-core fibers has been investigated by introducing random fluctuation along longitudinal direction. power coupling coefficients coupled-power theory heterogeneous fiber with seven cores were estimated based on consideration homogeneous fiber. can be quantitatively evaluated employing instead coupled-mode theory.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text K. Takenaga, Y. Arakawa, S. Tanigawa, N. Guan, Matsuo, Saitoh, and M. Koshiba, "Reduction of Crosstalk by Trench-Assisted Multi-Core Fiber," in Optical Fiber Communication Conference/National Optic Engineers Conference 2011, OSA Technical Digest (CD) (Optica Publishing Group, 2011), paper OWJ4. Export BibTex Endnote (RIS) HTML Plain alert Save article