scholarly journals Investigation of an In-Line Slot Waveguide Sensor Built in a Tapered D-Shaped Silicon-Cored Fiber

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 7832
Author(s):  
Kai-Ju Lin ◽  
Lon A. Wang
Keyword(s):  
Light Field ◽  
Single Mode ◽  
Slot Waveguide ◽  
Simulation Results ◽  
Waveguide Sensors ◽  
Tapered Region ◽  
Waveguide Sensor ◽  
Slot Waveguides

An in-line slot waveguide sensor built in a polished flat platform of a D-shaped silicon cored fiber with a taper coupled region is proposed and investigated thoroughly. Simulation results show that the single-mode light field sustained in the silicon cored fiber can be efficiently transferred to the slot waveguides through the tapered region. The geometry parameters of the slot waveguide sensors are optimized to have the corresponding highest power confinement factors and the resultant sensor sensitivities. The three-slot waveguide sensor is found to have the best performance among one-, two- and three-slot waveguides at the mid-IR wavelength.

scholarly journals Mode and group velocity dispersion evolution in the tapered region of a single-mode tapered fiber

2004 ◽  
Vol 12 (24) ◽  
pp. 5840 ◽  
Author(s):  
Rui Zhang ◽  
Xinping Zhang ◽  
Dominic Meiser ◽  
Harald Giessen
Keyword(s):  
Group Velocity ◽  
Velocity Dispersion ◽  
Group Velocity Dispersion ◽  
Single Mode ◽  
Tapered Fiber ◽  
Tapered Region

Quantum teleportation of single-mode thermal state of light field

2005 ◽  
Vol 7 (11) ◽  
pp. 313-318 ◽  
Author(s):  
Junxiang Zhang ◽  
Changde Xie ◽  
Kunchi Peng
Keyword(s):  
Quantum Teleportation ◽  
Light Field ◽  
Thermal State ◽  
Single Mode

Observation of Dicke cooperativity in magnetic interactions

Science ◽  
2018 ◽  
Vol 361 (6404) ◽  
pp. 794-797 ◽  
Author(s):  
Xinwei Li ◽  
Motoaki Bamba ◽  
Ning Yuan ◽  
Qi Zhang ◽  
Yage Zhao ◽  
...  
Keyword(s):  
Quantum Optics ◽  
Body Problem ◽  
Light Field ◽  
Condensed Matter ◽  
Single Mode ◽  
Magnetic Interactions ◽  
Many Body ◽  
Matter Interaction ◽  
Magnetic Solid ◽  
Vacuum Rabi Splitting

The interaction ofNtwo-level atoms with a single-mode light field is an extensively studied many-body problem in quantum optics, first analyzed by Dicke in the context of superradiance. A characteristic of such systems is the cooperative enhancement of the coupling strength by a factor of N. In this study, we extended this cooperatively enhanced coupling to a solid-state system, demonstrating that it also occurs in a magnetic solid in the form of matter-matter interaction. Specifically, the exchange interaction ofNparamagnetic erbium(III) (Er3+) spins with an iron(III) (Fe3+) magnon field in erbium orthoferrite (ErFeO3) exhibits a vacuum Rabi splitting whose magnitude is proportional to N. Our results provide a route for understanding, controlling, and predicting novel phases of condensed matter using concepts and tools available in quantum optics.

Power-optimized single-mode slot waveguides

2007 ◽  
Author(s):  
Paul Müllner ◽  
Rainer Hainberger
Keyword(s):  
Single Mode ◽  
Slot Waveguides

scholarly journals Slot-Waveguide Silicon Nitride Organic Hybrid Distributed Feedback Laser

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Florian Vogelbacher ◽  
Martin Sagmeister ◽  
Jochen Kraft ◽  
Xue Zhou ◽  
Jinhua Huang ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Laser Diode ◽  
Optical Feedback ◽  
Single Mode ◽  
Distributed Feedback ◽  
Blue Laser ◽  
Slot Waveguide ◽  
Light Sources ◽  
Distributed Feedback Laser ◽  
Organic Hybrid

AbstractOne of the major barriers for a widespread commercial uptake of silicon nitride photonic integrated circuits for cost-sensitive applications is the lack of low-cost monolithically integrated laser light sources directly emitting into single-mode waveguides. In this work, we demonstrate an optically pumped organic solid-state slot-waveguide distributed feedback laser designed for a silicon nitride organic hybrid photonic platform. Pulsed optical excitation of the gain medium is achieved by a 450 nm laser diode. The optical feedback for lasing is based on a second-order laterally coupled Bragg grating with a slot-waveguide core. Optimized material gain properties of the organic dye together with the increased modal gain of the laser mode arising from the improved overlap of the slot-waveguide geometry with the gain material enable single-mode lasing at a wavelength of 600 nm. The straightforward integration and operation with a blue laser diode leads to a cost-effective coherent light source for photonic integrated devices.

scholarly journals Improved Training Sequence Channel Estimation Scheme in 16QAM MB-OFDM UWBoF System

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Changqing Xiang ◽  
Xi Yang ◽  
Xuan Zhou ◽  
Xiaojun Zhu ◽  
Jincan Xu ◽  
...  
Keyword(s):  
Channel Estimation ◽  
Time Domain ◽  
Orthogonal Frequency Division Multiplexing ◽  
Single Mode ◽  
Training Sequence ◽  
Single Mode Fiber ◽  
Frequency Division ◽  
Training Sequences ◽  
Estimation Scheme ◽  
Simulation Results

In this paper, an improved channel estimation scheme based on time-domain orthogonal gray complementary training sequence (Golay TS) is proposed to resist subcarrier mutual beat interference in 16-quadrature amplitude modulation multiband orthogonal-frequency-division-multiplexing ultrawide band over fiber (16QAM MB-OFDM UWBoF) systems. The simulation results showed that the performance of system with the improved Golay TS channel estimation scheme was improved by about 1 dB compared with the traditional Golay TS channel estimation scheme, at a bit error rate (BER) of 3.8 × 10−3 after 70 km standard single mode fiber (SSMF) transmission. At the same time, the synchronization and channel estimation performance of Golay TS and the selected frequency-domain orthogonal training sequences (TSs) were compared. The simulation results showed that the performance of system with the TSs channel estimation was improved by about 2.7 dB compared with the improved Golay TS channel estimation.

scholarly journals Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding

Fibers ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 14 ◽  
Author(s):  
Jakeya Sultana ◽  
Md. Saiful Islam ◽  
Cristiano M. B. Cordeiro ◽  
Alex Dinovitser ◽  
Mayank Kaushik ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Terahertz Radiation ◽  
Single Mode ◽  
Hollow Core ◽  
Crystal Fiber ◽  
Higher Order Modes ◽  
Metallic Inclusions ◽  
Simulation Results ◽  
Lower Loss ◽  
Thz Waves

A hollow core antiresonant photonic crystal fiber (HC-ARPCF) with metal inclusions is numerically analyzed for transmission of terahertz (THz) waves. The propagation of fundamental and higher order modes are investigated and the results are compared with conventional dielectric antiresonant (AR) fiber designs. Simulation results show that broadband terahertz radiation can be guided with six times lower loss in such hollow core fibers with metallic inclusions, compared to tube lattice fiber, covering a single mode bandwidth (BW) of 700 GHz.

Simplification of the Maxwell-Bloch Equation of Standing Wave Lasers

2013 ◽  
Vol 760-762 ◽  
pp. 8-14
Author(s):  
Li Cheng Sun ◽  
Zheng Wu
Keyword(s):  
Mathematical Model ◽  
Numerical Simulations ◽  
Standing Wave ◽  
Light Field ◽  
Single Mode ◽  
Bloch Equation ◽  
Wave Form ◽  
Wave Laser ◽  
Mathematical Evaluation ◽  
New Equation

In order to make a numerical simulation of the chaos in standing wave lasers, a dynamic equation that is feasible to mathematical evaluation is required. There is a summation symbol in the well known Haken laser equation, and it results in a tremendously heavy quantity of evaluation. In order to simplify the evaluation, the light field in the Haken laser equation was expanded in the standing wave form. Two macroscopic variables were brought in to eliminate the summation symbol in terms of single mode and homogeneously broadening. Therefore, a simplified Maxwell-Bloch equation was gained. Then by normalizing, a new equation was obtained. This equation is in a simple form. Its every variable has unambiguous meaning and every coefficient is only related to gain or dissipation and is easy to obtain. Moreover, the equation is used in two MATLAB numerical simulations of a CO2laser and a chaotic attractor is obtained. So the equation could be a mathematical model in numerical simulations of standing wave laser chaos.

Performance Comparison of LS and LMMSE Channel Estimation Algorithm for CO-OFDM System

2011 ◽  
Vol 130-134 ◽  
pp. 2965-2968
Author(s):  
Zheng Rong Tong ◽  
Min Jie Guo ◽  
Xiu Feng Yang ◽  
Wei Hua Zhang
Keyword(s):  
Optical Fiber ◽  
Bit Error Rate ◽  
System Performance ◽  
Single Mode ◽  
Estimation Algorithm ◽  
Performance Comparison ◽  
Ofdm System ◽  
Fiber System ◽  
Single Mode Optical Fiber ◽  
Simulation Results

The CO-OFDM single-mode optical fiber system is constructed by the Matlab coupled with the Optisystem. And the influence of different channel algorithm on the receiver of system is researched. The simulation results show that the system performance is improved by using LS or LMMSE channel algorithm. And the LMMSE channel algorithm can provide better performance than the LS channel algorithm. Compared with LS algorithm, the required receiver OSNR is reduced by about 1 dB using improved LMMSE algorithm at bit-error-rate (BER) =10-4 in the CO-OFDM single-mode optical fiber system.

Experimental study of the response of a bad cavity bistable system to fast light switch-on

1984 ◽  
Vol 313 (1525) ◽  
pp. 417-420 ◽  
Keyword(s):  
Light Field ◽  
Single Mode ◽  
Bistable System ◽  
Preliminary Results ◽  
Fabry Perot ◽  
Atomic Beams ◽  
Fast Light ◽  
Branch Switching ◽  
Atom Dynamics ◽  
System Approaches

Preliminary results are reported on the response of an intrinsic bistable system to the rapid switch-on of an injected light field. The bistable system consists of a linear array of 25 sodium atomic beams contained in a low finesse Fabry—Perot etalon. The beams are aligned perpendicular to the direction of propagation of the cavity field and are collimated sufficiently to resolve the D-line ground state 3 2 S 1/2 hyperfine structure. The etalon conditions are such that the cavity lifetime is an estimated 6 ns compared with the atomic lifetime of 16 ns; hence the system approaches the bad cavity limit in which the atom dynamics should be observable. The radiation from a single-mode ring dye laser is switched on to the bistable system in approximately 1 ns. Although preliminary results show low branch to high branch switching there is no evidence of the expected nutational oscillations.

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