Measurement of bit error rate as a function of optical crosstalk in multimode optical fibre digital transmission systems operating at 140 Mbit/s

1986 ◽  
Vol 22 (13) ◽  
pp. 687
Author(s):  
M. Rocks
Keyword(s):  
Optical Fibre ◽  
Bit Error Rate ◽  
Error Rate ◽  
Digital Transmission ◽  
Transmission Systems ◽  
Optical Crosstalk ◽  
Multimode Optical Fibre

scholarly journals Performance Analysis, Characteristics, and Simulation of Digital QAM

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Nikolaos Voudoukis
Keyword(s):  
Performance Analysis ◽  
Bit Error Rate ◽  
Error Rate ◽  
Amplitude Modulation ◽  
Performance Indicators ◽  
Digital Transmission ◽  
Quadrature Amplitude Modulation ◽  
Radio Communications ◽  
Awgn Channel ◽  
Data Rates

Quadrature Amplitude Modulation or QAM is a form of modulation which is widely used for modulating data signals onto a carrier used for radio communications. QAM, when used for digital transmission for radio communications applications is able to carry higher data rates than ordinary amplitude modulated schemes and phase modulated schemes. This paper presents the various fields where QAM can be implemented, describes modulator/demodulator block diagrams for transmitters as well as receivers, provides an introduction of certain performance indicators of modulation and a list of applications using alternative implementations of QAM. Also the paper presents a simulation of QAM using Simulink (example of 16-QAM signal) with signal trajectors and constellation plots. It is compared the theoretical and simulated Bit Error Rate (BER) for 16-QAM with Gray coding in an AWGN channel. Some general conclusions are also cited.

scholarly journals Performance Analysis of DPSK Technique for Optical Transmission Systems

2021 ◽  
Vol 2021 (2) ◽  
pp. 6-10
Author(s):  
Zeyad Yaseen
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Optical Transmission ◽  
Optical Signal ◽  
Optical Field ◽  
High Data Rate ◽  
Long Distance ◽  
Transmission Systems ◽  
High Data ◽  
Optical Transmission Systems

The long-distance high data rate transmission is accompanied by many transmission defects, which reduce the performance of optical communication systems. Therefore, due to the need to increase data capacity for the end user, signal regeneration techniques were used to mitigate these non-linear defects in the electric or optical field. Several techniques used to modify the optical signal, which is the possible solution to reduce the limit of non-linear transmission defects, especially before converting the signal from the optical field to the electric field. Since most of the techniques used to reduce the attenuation in the optical signal do not have the ability to reduce the error rate to reach a bit error rate (BER) less than 10-10 with a transmission capacity less than -10dBm. In this paper, the performance evaluation of DPSK has been validated for its adequate use in transmission systems. Nevertheless, the performance of the DPSK optical system was assessed to rely on a different coding format such as: Return to Zero (RZ) & Non-Return to Zero (NRZ-DPSK). The system is designed to withstand high data rate on long-distance optical transmission systems. The system investigated was simulated with OptiSystemTM 13.0 commercial software. The investigated system demonstrated the ability to mitigate nonlinear impairments from the noisy optical DPSK system with high bit-error rate (BER) improvement at low power transmission. Optical DPSK demonstrates the ability to send high-rate data transmission systems for use in the next generation of optical networks.

Sign in / Sign up

Export Citation Format

Share Document