Optical Signal Decay and Information Data Loss in Wireless Atmospheric Communication Links with Fading

2021 ◽  
pp. 424-443
Author(s):  
Irina Bronfman ◽  
Irit Juwiler ◽  
Nathan Blaunstein ◽  
Anatolii Semenko
Keyword(s):  
Optical Signal ◽  
Data Loss ◽  
Signal Decay ◽  
Communication Links

Comparative analysis of SISO and wavelength diversity-based FSO systems at different transmitter power levels

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Varun Srivastava ◽  
Abhilash Mandloi ◽  
Dhiraj Kumar Patel
Keyword(s):  
Optical Signal ◽  
Free Space Optical ◽  
Optical Source ◽  
Transmit Power ◽  
Single Input Single Output ◽  
Transmitter Power ◽  
Single Output ◽  
Communication Links ◽  
Single Input ◽  
Matching Performance

AbstractFree space optical (FSO) communication refers to a line of sight technology, which comprises optical source and detector to create a link without the use of physical connections. Similar to other wireless communication links, these are severely affected by losses that emerged due to atmospheric turbulence and lead to deteriorated intensity of the optical signal at the receiver. This impairment can be compensated easily by enhancing the transmitter power. However, increasing the transmitter power has some limitations as per radiation regulations. The requirement of high transmit power can be reduced by employing diversity methods. This paper presents, a wavelength-based diversity method with equal gain combining receiver, an effective technique to provide matching performance to single input single output at a comparatively low transmit power.

scholarly journals In-Band OSNR Measurement Method for All-Optical Regenerators in Optical Domain

2019 ◽  
Vol 9 (24) ◽  
pp. 5438
Author(s):  
Feng Wan ◽  
Baojian Wu ◽  
Feng Wen ◽  
Kun Qiu
Keyword(s):  
Measurement Method ◽  
Signal To Noise Ratio ◽  
Optical Signal ◽  
Error Vector Magnitude ◽  
Regeneration System ◽  
Data Rates ◽  
All Optical ◽  
Communication Links ◽  
Shift Keying ◽  
Nonlinear Devices

We propose an in-band measurement method of optical signal-to-noise ratio (OSNR) output from an all-optical regeneration system with a nonlinear power transfer function (PTF) according to the fact that there are different average gains of signal and noise. For the all-optical quadrature phase-shift keying (QPSK) regenerator as an example, the output OSNR is derived from the input OSNR and the total gain of the degraded QPSK signal. Our simulation shows that the OSNR results obtained by this method are in agreement with those calculated from the error vector magnitude (EVM) formula. The method presented here has good applicability for different data rates but is also useful for analyzing the OSNR degradation of other nonlinear devices in optical communication links.

scholarly journals Optical Transmitters without Driver Amplifiers—Optimal Operation Conditions

2018 ◽  
Vol 8 (9) ◽  
pp. 1652 ◽  
Author(s):  
Arne Josten ◽  
Benedikt Baeuerle ◽  
Romain Bonjour ◽  
Wolfgang Heni ◽  
Juerg Leuthold
Keyword(s):  
Single Channel ◽  
Direct Detection ◽  
Signal To Noise Ratio ◽  
Optical Signal ◽  
Optimal Operation ◽  
Signal Quality ◽  
Root Mean Square Amplitude ◽  
Operation Conditions ◽  
Communication Links ◽  
Eye Opening

An important challenge in optical communications is the generation of highest-quality waveforms with a Mach–Zehnder modulator with a limited electrical swing (Vpp). For this, we discuss, under limited Vpp, the influence of the waveform design on the root-mean-square amplitude, and thus, the optical signal quality. We discuss the influence of the pulse shape, clipping, and digital pre-distortion on the signal quality after the electrical-to-optical conversion. Our simulations and experiments, e.g., suggest that pre-distortion comes at the expense of electrical swing of the eye-opening and results in a lower optical signal-to-noise ratio (OSNR). Conversely, digital post-distortion provides operation with larger eye-openings, and therefore, provides an SNR increase of at least 0.5 dB. Furthermore, we find that increasing the roll-off factor increases the electrical swing of the eye-opening. However, there is negligible benefit of increasing the roll-off factor of square-root-raised-cosine pulse shaped signals beyond 0.4. The findings are of interest for single-channel intensity modulation and direct detection (IM/DD) links, as well as optical coherent communication links.

scholarly journals Analysis of total signal decay and capacity of information data in wireless atmospheric communication links. Part 2

2020 ◽  
pp. 54-62
Author(s):  
Irit Juwiler ◽  
Irina Bronfman ◽  
Natan Blaunstein
Keyword(s):  
Spectral Efficiency ◽  
Data Stream ◽  
Path Loss ◽  
Meteorological Conditions ◽  
Turbulent Structures ◽  
Optical Signals ◽  
Signal Decay ◽  
Fast Fading ◽  
Communication Links

Introduction: Analysis of total signal decay is based on prognosis of the total path loss occurring in the atmospheric communication links, accounting for effects of gaseous structures attenuation and scattering, hydrometeors (rain, snow and clouds) absorption and attenuation, and turbulent structures fast fading on radio and optical signals passing atmospheric channels with fading. Purpose: To perform a novel methodology of definition and estimation of effects of decay, absorption, scattering, and fading of radio and optical signals propagating in atmospheric channels in various meteorological conditions. Results: Wasanalyzed the impact of gaseous structures, hydrometeors and turbulent structures in total path loss for link budget design and in degradation of data stream parameters, such as capacity, spectral efficiency and bit-error-rate, which lead in loss of information data signals passing such kinds of channels with fast fading and decrease of quality of service. An optimal algorithm was found of the total path loss prediction for various meteorological situations occurring in the real atmosphere at different heights and for various frequencies of radiated signals. A method was proposed of how to evaluate the data stream parameters, capacity, spectralefficiency and bit-error-rate, accounting for the effects of atmospheric turbulence impact on fast fading, which corrupts information passing such kinds of channels. All practical tests were illustrated by the use of the MATLAB utility. A new methodology was proposed on how to evaluate and estimate the capacity, the spectral efficiency, and the loss in energy and in the information data stream for different scenarios of radio and optical signals propagation via atmospheric channels with fading caused by different meteorological conditions. Practical relevance: The results obtained allow to achieve better accuracy of prognosis and increase quality of service in atmospheric communication channels.

scholarly journals RELIABLITY CONTROL USING LOSS RECOVERY RATIO IN WIRELESS SENSOR NETWORK

2013 ◽  
pp. 20-25
Author(s):  
KETAN SANTOSH DHAMANSKAR
Keyword(s):  
Wireless Sensor Network ◽  
Sensor Network ◽  
Cluster Head ◽  
Wireless Sensor ◽  
Network Congestion ◽  
Data Loss ◽  
Loss Recovery ◽  
Cluster Heads ◽  
Communication Links ◽  
Packet Drop

In Wireless Sensor Network congestion leads to the degradation of communication links that result in the decreased the reliability and waste of energy which one of the scarcest resources of sensor network. In cluster based environment each sensor senses the information and forwarded to its cluster head and cluster head will forward that data packet towards the sink. But the cluster heads are one hop from sink node so that they acts as intermediate nodes and hence there are more chances of congestion and leads to packet drop i.e. nothing but data loss. In my model I recover this data loss by using my loss recovery model where I attach the database to the cluster heads and those packets which are drop at cluster head due to congestion are push into the database and re-transmitted to the sink with high priority.

Sign in / Sign up

Export Citation Format

Share Document