scholarly journals Real & Simulated QPSK Up-Converted Signals by a Sampling Method Using a Cascaded MZMs Link

Photonics ◽  
2022 ◽  
Vol 9 (1) ◽  
pp. 34
Author(s):  
Hassan Termos ◽  
Ali Nansour
Keyword(s):  
Real World ◽  
Sampling Technique ◽  
Operating Regime ◽  
Phase Shift Keying ◽  
Bit Rate ◽  
Error Vector Magnitude ◽  
Shift Keying ◽  
Mixing Frequency ◽  
Novel Concept ◽  
Vector Magnitude

This study focuses on a novel concept of transmitting of a quadrature phase shift keying (QPSK) modulation by an electro-optical frequency up-conversion using a cascaded Mach–Zehnder modulators (MZMs) link. Furthermore, we conduct and compare the results obtained by simulations using the Virtual Photonics Inc. (VPI) (Berlin, Germany) simulator and real-world experiments. The design and operating regime peculiarities of the MZM used as a sampling up-converter mixer in a radio over fiber (RoF) system are also analyzed. Besides, the simulation and experimental results of static and dynamic characteristics of the MZM have approximately the same behavior. The conversion gain of the cascaded MZMs link is simulated over many mixing frequencies and it can decrease from 17.5 dB at 8.3 GHz to −4.5 dB at 39.5 GHz. However, in real world settings, it may decrease from 15.5 dB at 8.3 GHz to −6 dB at 39.5 GHz. The maximum frequency range is attained at 78.5 GHz for up-conversion through simulations. Error vector magnitude (EVM) values have been done to evaluate the performance of our system. An EVM of 16% at a mixing frequency of 39.5 GHz with a bit rate of 12.5 Gbit/s was observed with the considering sampling technique, while it reached 19% in real-world settings with a sampling frequency of 39.5 GHz and a bit rate of 12.5 Gbit/s.

scholarly journals HIGH DATA RATE WDM SYSTEMS-BASED GRAPHENE CARRIERS

2020 ◽  
Vol 15 (11) ◽  
Author(s):  
Saib Thiab Alwan
Keyword(s):  
Wavelength Division Multiplexing ◽  
Data Rate ◽  
High Data Rate ◽  
Optical Channel ◽  
Phase Shift Keying ◽  
Error Vector Magnitude ◽  
Wavelength Division ◽  
High Data ◽  
Shift Keying ◽  
Vector Magnitude

In this paper, carrier’s generation-based graphene with applicability for wavelength division multiplexing (WDM) systems have been produced via an illumination of graphene by 980 nm. This technique allowed for servicing of a greater number of channels in a WDM system, and the carriers were able to travel in an optical channel with high data rate. Eight carriers, having a frequency spacing (FS) of 25 GHz and full-width at half-maximum (FWHM) of 500 MHz, were created. These generated carriers were separately modulated with eight optical quadrature phase shift keying (QPSK) signals and subsequently optically multiplexed and transmitted to an optical fiber channel. At the receiver side, the received signal was demultiplexed, and the performance of the system was analyzed via calculating the error vector magnitude and constellation diagram of the entire system. Opti System version 17.1 and Matlab software are used for demonstration of WDM system and carrier generation.

scholarly journals Evaluación de un sistema de comunicación óptico empleando modulación por desplazamiento de fase QPSK, 8PSK y 16PSK utilizando la técnica FDM

2020 ◽  
pp. 76-83
Author(s):  
Karla Puerto ◽  
Dionel Ropero-Torres ◽  
Dinael Guevara
Keyword(s):  
Phase Shift ◽  
Error Rate ◽  
Phase Shift Keying ◽  
Error Vector Magnitude ◽  
Error Vector ◽  
Shift Keying ◽  
El Sistema ◽  
Vector Magnitude

En este documento se presenta un sistema de comunicaciones óptico desde la generación de la señal, la modulación y la transmisión por la fibra óptica. Se emplea la técnica de multiplexación por división de frecuencia (FDM), usando una modulación por desplazamiento de fase (PSK, de phase shift keying). Se evalúa el sistema de comunicaciones ópticas a través de una herramienta computacional de uso académico ya avalada por la comunidad científica, comparando los resultados bajo los diferentes formatos de modulación como son Q-PSK, 8-PSK y 16-PSK. Se realiza la medición del error de la magnitud del vector (EVM, error vector magnitude) como porcentaje y decibeles de los valores pico y promedio, adicionalmente se evalúa la tasa de error de modulación (MER, modulation error rate). Se concluye que en la modulación 16-PSK los datos de EVM en RMS y valores pico son un 50.25% menor comparados con Q-PSK y 8-PSK y el valor promedio en MER en dB para 16-PSK está en un 42.25% mayor que en Q-PSK y 8-PSK. Lo que indica que para el sistema de comunicación óptico implementado el formato de modulación 16-PSK proporciona un mejor rendimiento en la transmisión.

scholarly journals Perancangan Sistem Modulator Binary Phase Shift Keying

2016 ◽  
Vol 15 (01) ◽  
pp. 77-89
Author(s):  
Deddy Susilo ◽  
Budihardja Murtianta ◽  
Arivia Aurelia Devina P.
Keyword(s):  
Phase Shift ◽  
Phase Shift Keying ◽  
Bit Rate ◽  
Pseudorandom Generator ◽  
Binary Phase ◽  
Shift Keying ◽  
Level Shifter ◽  
Binary Phase Shift Keying

Sistem yang dibangun adalah sebuah modul sistem modulator BPSK (Binary Phase Shift Keying). Perangkat yang dibahas adalah modulator BPSK dengan frekuensi 10kHz-48kHz dan untuk transmisi secara nirkabel ditambahkan pemancar FM yang akan mentranslasikan sinyal pembawa pada frekuensi radio sebesar 80MHz. Berdasarkan pengujian yang telah dilakukan, sistem perangkat modulator BPSK yang dibangun dapat bekerja dengan baik. Perancangan pseudorandom generator dengan menanamkan algoritma register geser 5 tingkat dengan mikrokontroler AVR ATTINY13A dapat diatur dengan bit rate bervariasi dari 1200, 2400, 4800 dan 9600 bps. Untai tapis lolos rendah Bessel orde 2 dengan fc 48kHz dapat berfungsi memperhalus hasil keluaran pseudorandom generator dan level shifter. Untai selektor keluaran BPSK dapat berfungsi dengan baik untuk pemilih sinyal sinus 0° dan 180° serta pemancar FM dapat menghasilkan spectrum sinyal paling tinggi pada frekuensi 80MHz.

Transmission Performance of 112 Gb/s POLMUX QPSK Signal in OOK/DPSK WDM System

2020 ◽  
Vol 41 (2) ◽  
pp. 171-176
Author(s):  
Harmanpreet Kaur Sandhu ◽  
R.S Kaler ◽  
Gurpreet Kaur ◽  
Rajneesh Randhawa
Keyword(s):  
Phase Shift ◽  
Wavelength Division Multiplexing ◽  
Phase Modulation ◽  
Optical Signal ◽  
Phase Shift Keying ◽  
Error Vector Magnitude ◽  
Differential Phase Shift ◽  
Wavelength Division ◽  
Shift Keying ◽  
The Impact

AbstractIn this article, the impact of cross-phase modulation (XPM) and cross-polarization modulation (XpolM) on transmission of 112 Gb/s polarization multiplexed quadrature phase shift keying (POLMUX QPSK) signal in a wavelength division multiplexing (WDM) system has been investigated. This WDM system comprises of on-off keying (OOK) or differential phase shift keying (DPSK) channels. It is observed that the effects of XPM and XpolM are greatly reduced in a hybrid system of co-propagating OOK and DPSK channels. This is due to the dominance of phase modulation of DPSK signals rather than the intensity modulated OOK signals. The error vector magnitude (EVM) of the received optical signal is evaluated for the increase in number of neighbouring OOK and DPSK channels respectively within a bandwidth of 350 GHz. Also, the effect of increase in bit rate for two neighbouring OOK and DPSK channels has been observed individually on the 112 Gb/s POLMUX QPSK signal. It is concluded that DPSK signals display an improvement of −9.44 dB in EVM over OOK signals when there are eight neighbouring channels in the transmission system.

DP-QPSK Technique for Ultra-high Bit-rate DWDM FSO System

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Subhrajit Pradhan ◽  
Bijayananda Patnaik ◽  
Rashmita Kumari Panigrahy
Keyword(s):  
Phase Shift ◽  
Wavelength Division Multiplexing ◽  
High Capacity ◽  
Phase Shift Keying ◽  
Bit Rate ◽  
Free Space Optical ◽  
Eye Diagram ◽  
Quadrature Phase Shift Keying ◽  
Quadrature Phase ◽  
Shift Keying

AbstractThis paper proposes an ultra-high capacity free space optical communication (FSO) system, employing optical dual polarization quadrature phase shift keying (DP-QPSK) modulation format. It is a 16-channel dense wavelength division multiplexing (DWDM) system with 120 Gbps/channel bit rate. The FSO system is analyzed with three optical advanced modulation schemes; such as 4-quadrature amplitude modulation (4-QAM), quadrature phase shift keying (QPSK) and DP-QPSK. The main focus of the projected system is to improve the FSO setup performance in terms of eye diagram, bit error rate (BER), high received power and Q-factor. The center channel wavelength used for the proposed system is 1550 nm. In the present wireless communication world, the proposed system will be highly helpful as an ultrahigh capacity wireless system.

Performance Comparison between DPSK and OQPSK modulation approaches in multi environments channels with Matlab Simulink models

2019 ◽  
Vol 7 (1) ◽  
pp. 30-39
Author(s):  
Fatima faydhe Al- Azzawi ◽  
Faeza Abas Abid ◽  
Zainab faydhe Al-Azzawi
Keyword(s):  
Phase Shift ◽  
Fading Channels ◽  
Additive White Gaussian Noise ◽  
Block Codes ◽  
Performance Comparison ◽  
Phase Shift Keying ◽  
Differential Phase Shift ◽  
Matlab Simulink ◽  
Communication Industry ◽  
Shift Keying

Phase shift keying modulation approaches are widely used in the communication industry. Differential phase shift keying (DPSK) and Offset Quadrature phase shift keying (OQPSK) schemes are chosen to be investigated is multi environment channels, where both systems are designed using MATLAB Simulink and tested. Cross talk and unity of signals generated from DPSK and OQPSK are examined using Cross-correlation and auto-correlation, respectively. In this research a proposed system included improvement in bit error rate (BER) of both systems in  the additive white Gaussian Noise (AWGN) channel, by using the convolutional and block codes, by increasing the ratio of energy in the specular component to the energy in the diffuse component (k) and  the diversity order BER in the fading channels will be improved in both systems.    

scholarly journals Application of Ultra Narrow Band Modulation in Enhanced Loran System

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4347
Author(s):  
Boyun Lyu ◽  
Yu Hua ◽  
Jiangbin Yuan ◽  
Shifeng Li
Keyword(s):  
Narrow Band ◽  
Data Rate ◽  
Modulation Method ◽  
Phase Shift Keying ◽  
Spectrum Utilization ◽  
Frequency Domains ◽  
Shift Keying ◽  
Modulation Methods ◽  
Binary Phase Shift Keying ◽  
Signal Time

The Enhanced Loran (eLoran) system is valued for its important role in the positioning, navigation, and timing fields; however, with its current modulation methods, low data rate restricts its development. Ultra narrow band (UNB) modulation is a modulation method with extremely high spectrum utilization. If UNB modulation can be applied to the eLoran system, it will be very helpful. The extended binary phase shift keying modulation in UNB modulation is selected for a detailed study, parameters and application model are designed according to its unique characteristics of signal time and frequency domains, and it is verified through simulation that the application of this modulation not only meets the design constraints of the eLoran system but also does not affect the reception of the respective signals of both parties. Several feasible schemes are compared, analyzed, and selected. Studies have revealed that application of UNB modulation in the eLoran system is feasible, and it will increase the data rate of the system by dozens of times.

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