scholarly journals Tunable topological charge vortex microlaser

Science ◽  
2020 ◽  
Vol 368 (6492) ◽  
pp. 760-763 ◽  
Author(s):  
Zhifeng Zhang ◽  
Xingdu Qiao ◽  
Bikashkali Midya ◽  
Kevin Liu ◽  
Jingbo Sun ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Room Temperature ◽  
Light Emission ◽  
High Capacity ◽  
Momentum Conservation ◽  
Wavelength Division ◽  
Telecommunication Wavelength ◽  
Capacity Data ◽  
Light Beams ◽  
Data Multiplexing

The orbital angular momentum (OAM) intrinsically carried by vortex light beams holds a promise for multidimensional high-capacity data multiplexing, meeting the ever-increasing demands for information. Development of a dynamically tunable OAM light source is a critical step in the realization of OAM modulation and multiplexing. By harnessing the properties of total momentum conservation, spin-orbit interaction, and optical non-Hermitian symmetry breaking, we demonstrate an OAM-tunable vortex microlaser, providing chiral light states of variable topological charges at a single telecommunication wavelength. The scheme of the non–Hermitian-controlled chiral light emission at room temperature can be further scaled up for simultaneous multivortex emissions in a flexible manner. Our work provides a route for the development of the next generation of multidimensional OAM-spin-wavelength division multiplexing technology.

scholarly journals Cylindrical vector beam multiplexer/demultiplexer using off-axis polarization control

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Shuqing Chen ◽  
Zhiqiang Xie ◽  
Huapeng Ye ◽  
Xinrou Wang ◽  
Zhenghao Guo ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Transmission Rate ◽  
High Capacity ◽  
Wavelength Division ◽  
Polarization Control ◽  
Vector Beam ◽  
Vector Mode ◽  
Control Technologies ◽  
Polarization Division Multiplexing ◽  
Cylindrical Vector Beam

AbstractThe emergence of cylindrical vector beam (CVB) multiplexing has opened new avenues for high-capacity optical communication. Although several configurations have been developed to couple/separate CVBs, the CVB multiplexer/demultiplexer remains elusive due to lack of effective off-axis polarization control technologies. Here we report a straightforward approach to realize off-axis polarization control for CVB multiplexing/demultiplexing based on a metal–dielectric–metal metasurface. We show that the left- and right-handed circularly polarized (LHCP/RHCP) components of CVBs are independently modulated via spin-to-orbit interactions by the properly designed metasurface, and then simultaneously multiplexed and demultiplexed due to the reversibility of light path and the conservation of vector mode. We also show that the proposed multiplexers/demultiplexers are broadband (from 1310 to 1625 nm) and compatible with wavelength-division-multiplexing. As a proof of concept, we successfully demonstrate a four-channel CVB multiplexing communication, combining wavelength-division-multiplexing and polarization-division-multiplexing with a transmission rate of 1.56 Tbit/s and a bit-error-rate of 10−6 at the receive power of −21.6 dBm. This study paves the way for CVB multiplexing/demultiplexing and may benefit high-capacity CVB communication.

Wavelength Division Multiplexed Passive Optical Networks

2010 ◽  
pp. 68-101
Author(s):  
Calvin C.K. Chan
Keyword(s):  
Optical Networks ◽  
Large Scale ◽  
Driving Forces ◽  
Optical Network ◽  
Access Network ◽  
High Capacity ◽  
Next Generation ◽  
Wavelength Division ◽  
Wavelength Division Multiplexed ◽  
Capacity Data

Wavelength division multiplexed passive optical network has emerged as a promising solution to support a robust and large-scale next generation optical access network. It offers high-capacity data delivery and flexible bandwidth provisioning to all subscribers, so as to meet the ever-increasing bandwidth requirements as well as the quality of service requirements of the next generation broadband access networks. The maturity and reduced cost of the WDM components available in the market are also among the major driving forces to enhance the feasibility and practicality of commercial deployment. In this chapter, the author will provide a comprehensive discussion on the basic principles and network architectures for WDM-PONs, as well as their various enabling technologies. Different feasible approaches to support the two-way transmission will be discussed. It is believed that WDM-PON is an attractive solution to realize fiber-to-the-home (FTTH) applications.

scholarly journals Optically Stimulated Luminescence Sensitivity of Quartz for Provenance Analysis

2020 ◽  
Vol 3 (1) ◽  
pp. 6 ◽  
Author(s):  
André Oliveira Sawakuchi ◽  
Fernanda Costa Gonçalves Rodrigues ◽  
Thays Desiree Mineli ◽  
Vinícius Ribau Mendes ◽  
Dayane Batista Melo ◽  
...  
Keyword(s):  
Room Temperature ◽  
Light Emission ◽  
High Capacity ◽  
Optically Stimulated Luminescence ◽  
Sediment Provenance ◽  
Provenance Analysis ◽  
Light Stimulation ◽  
Transport Pathway ◽  
Ultraviolet Emission ◽  
Crucial Information

Finding the source or provenance of quartz grains occurring in a specific location allows us to constrain their transport pathway, which is crucial information to solve diverse problems in geosciences and related fields. The optically stimulated luminescence (OSL) sensitivity (light intensity per unit mass per unit radiation dose) has a high capacity for discrimination of quartz sediment grains and represents a promising technique for provenance analysis. In this study, we tested the use of quartz OSL sensitivity (ultraviolet emission) measured under different preheating temperatures and with blue light stimulation at room temperature (~20 °C) for sediment provenance analysis. Quartz OSL sensitivity measured at 20 °C is positively correlated with the sensitivity of an OSL signal measured using procedures (preheat at 190 °C for 10 s, blue stimulation at 125 °C and initial 1 s of light emission) to increase the contribution of the fast OSL component, which has been successfully applied for sediment provenance analysis. The higher OSL signal intensity measured without preheating and with light stimulation at room temperature allows the use of lower given doses, thus reducing measurement time. Additionally, the OSL sensitivity measured at 20 °C in polymineral silt samples of a marine sediment core is also suitable for provenance analysis, as demonstrated by comparison with other independent proxies. OSL signals obtained through light stimulation at room temperature have thus the potential to considerably expand measurement possibilities, including in situ measurements using portable OSL readers.

Hybrid 10-Gb/s, 2.5-Gb/s, 64-QAM, and AM-VSB high-capacity wavelength-division-multiplexing transport systems using SMF and LEAF fibers

2002 ◽  
Vol 14 (2) ◽  
pp. 230-232 ◽  
Author(s):  
Chien-Chung Lee ◽  
Yung-Kuang Chen ◽  
Chia-Hsiung Chang ◽  
Kai-Ming Feng ◽  
Sohn-Ling Tzeng ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
High Capacity ◽  
Transport Systems ◽  
Wavelength Division

DWDM of Optical Micro Ring Resonator Double Add/Drop Multiplexing for THz Optical Communication

2013 ◽  
Vol 770 ◽  
pp. 390-393 ◽  
Author(s):  
N. Pornsuwancharoen ◽  
M. Tasakorn ◽  
S. Jurajaturasiraratn
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Communication ◽  
High Capacity ◽  
Microring Resonator ◽  
Wavelength Division ◽  
Network Applications ◽  
Wide Range ◽  
Gaussian Input ◽  
The Common ◽  
Very High

A system that can be used to generate the new optical communication bandwidths using a Gaussian pulse propagating within a nonlinear microring resonator double add/drop multiplexing system is discussed. By using the wide range of the Gaussian input pulses, for instance, when the input pulses of the common lasers with center wavelength of 1,500 nm are used. Results obtained shows that more available wavelength bands from the optical communication band can be generated, which can be used to form new dense wavelength division multiplexing bands, whereas the use of the very high capacity more than 200 channels for personal wavelength and network applications is plausible.

Analysis of 64 channels based IS-OWC system using different intereference reduction techniques

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Suraj Mahajan ◽  
Preeti Gupta ◽  
Vijay Kumar
Keyword(s):  
Wavelength Division Multiplexing ◽  
High Speed ◽  
High Capacity ◽  
Optical Wireless ◽  
Differential Phase Shift ◽  
Wavelength Division ◽  
Reduction Techniques ◽  
Data Rates ◽  
Shift Keying ◽  
Great Consideration

AbstractOptical wireless communication in space is attracting great consideration due to high speed, high capacity, no EMI, high security, and wide bandwidth. OWC has edge over microwave communication because in laser based communication, relay feature saves the time of the system. In this paper, different interference reduction techniques in wavelength division multiplexing based inter-satellite optical wireless system are presented at different data rates 10, 20, and 40 Gbps. Hybrid multiplexing using wide division multiplexing and time division multiplexing is proposed first and second technique proposed is polarization interleaving in IsOWC systems. Dense channel spacing system with diverse modulations is investigated further such as Chirped, differential phase shift keying, and alternate mark inversion (AMI). Q factor is the performance evaluation parameters for different distances.

scholarly journals Hybrid OFDM RoF-Based WDM-PON/MMW Backhaul Architecture For Heterogeneous Wireless Networks

2018 ◽  
Author(s):  
Trang Thi Thu Ngo ◽  
Thu Anh Pham ◽  
Nhan Duc Nguyen ◽  
Ngoc The Dang
Keyword(s):  
Wireless Networks ◽  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
Orthogonal Frequency Division Multiplexing ◽  
Heterogeneous Wireless Networks ◽  
High Capacity ◽  
Base Stations ◽  
Wavelength Division ◽  
Noise Amplifier ◽  
Wdm Pon

In this paper, a hybrid backhaul architecture, which is based on wavelength-division multiplexing passive optical networks (WDM-PON) and millimeter-wave (MMW) communications, is proposed to deliver orthogonal frequency-division multiplexing (OFDM) signals in heterogeneous wireless networks. MMW radio-over-fiber (RoF) technique, which combines the advantages of the both optical fiber and wireless communications, is used to simplify the base stations and provide flexibility long reach and high capacity connections. The feasibility of the proposed hybrid backhaul architecture is investigated via the bit-error rate (BER) performance of a downlink under the impacts of fiber nonlinear, wireless fading and noise components including clipping noise, amplifier noise and photodetector noise. The numerical results obtained from this study help to determine the optimum system parameters such as the optical launched power, modulation index, and amplifier gain so as to minimize the link’s BER.

scholarly journals Design and performance enhancement of a dense wavelength division multiplexing MIMO-FSO systems using DPPM and OOK modulation 

2021 ◽  
Author(s):  
Ebrahim E. Elsayed
Keyword(s):  
Wavelength Division Multiplexing ◽  
Performance Enhancement ◽  
Multiple Input Multiple Output ◽  
High Capacity ◽  
Free Space Optical ◽  
Dense Wavelength Division Multiplexing ◽  
Communication Performance ◽  
Power Efficient ◽  
Wavelength Division ◽  
Digital Pulse

Abstract In this paper, we design and analyze the dense wavelength division multiplexing (DWDM) in the multiple-input multiple-output (MIMO) free-space optical (FSO) communications system using the digital-pulse position modulation (DPPM) and on-off keying (OOK). We show the effects noises, interchannel crosstalk, and atmospheric turbulence for the proposed system in the weak and strong turbulence with the modulation techniques. DWDM channels suffer from the inter-channel crosstalk while the communication performance in an obviously limited by the MIMO-FSO caused by atmospheric scintillation. All Impairments, in addition to noises of the optical amplification which is emerged the amplified spontaneous emission and are likely to be problematic, particularly in the upstream direction, which are investigated, the results obtained a high enough crosstalk ratio can achieve access to high-capacity in a system network safe and human. DPPM is a more power efficient modulation and lower power penalty 0.2 ~ 0.3 dB from the OOK modulation.

Analysis of Four Wave Mixing In Ultra Dense WDM-Hybrid Optical Amplifier Systems

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Navjot Singh ◽  
Mahendra Kumar ◽  
Ashu Verma
Keyword(s):  
Wavelength Division Multiplexing ◽  
High Speed ◽  
High Capacity ◽  
Optical Amplifier ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Gain Bandwidth ◽  
Wavelength Division ◽  
Dense Wdm ◽  
And Performance

AbstractAmplification through hybrid optical amplifiers (HOAs) is a propitious and proficient technology for high speed and high capacity dense wavelength-division-multiplexing (DWDM) systems. HOAs are intended to improve system reach and to accomplish wide gain bandwidth with enhanced flatness of gain. In this work, an ultradense 16 channel WDM system is demonstrated and performance of diverse hybrid amplifiers is evaluated in terms of output power, Q-factor, gain flatness and BER. Spacing among the WDM channels is 25 GHz in order to make system bandwidth efficient and scrutinized its effect on four wave mixing (FWM) in case of EDFA-EDFA, Raman-EDFA and SOA-EDFA. It is observed that SOA-EDFA is more and Raman-EDFA is less prone to FWM. Moreover, for distance 20 Km–140 Km, Raman-EDFA is optimal configuration for amplification and from 150 Km–200  Km, SOA-EDFA shows better performance. For prolonged link lengths such as beyond 200  Km, EDFA-EDFA is a right hybrid amplifier. In order to achieve maximum gain flatness in proposed architecture, EDFA-EDFA is recommended to use.

Sign in / Sign up

Export Citation Format

Share Document