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Register a new userStudy and analysis of error performance when using multiple pulse position modulation (PPM) over optical fiber
دراسة و تحليل أداء الخطأ عند استخدام تعديل موقع النبضة (MPPM) في الليف الضوئي
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نقدّم في هذا البحث تحليلاً للأداء عند استخدام نظام تعديل موقع النبضة المتعدد (Multiple Pulse Position Modulation) (MPPM) في الليف الضوئي البلاستيكي ذي الدليل المتدرج (GI-POF).
This paper is concerned with an original analysis of an multiple pulse position modulation (MPPM) scheme using graded-index plastic optical fiber.
References used
Ghosna, F. J, and Sibley, M. (2010, February). Pulse position modulation coding schemes for optical intersatellite links. IETElectronics letters., Vol. 46, No.4, pp. 290-291
Toyoshima, M. Leeb, W. Kunimori, H. and Takano, T. Optical communications work best over relatively short distances in space. SPIE Newsroom, DOI: 10.1117/2.1200602.0088. Retrieved March 18, 2009, from http://spie.org/documents/Newsroom/Imported/0088/88_469_0_2006-02- 27.pdf
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Increasing data rate in optical communication systems leads to nonlinear electromagnet phenomenon in optical signal along fiber, and causes distortion in it.Thefiber dispersion is a linear phenomenon that causes difficulties toachieve high bit rate a
nd distance product.The limiting of nonlinear effects requireslow input power level, but this induces lowsignal to noise ratio. So, we search another solutions.
This paper studies Split Step Fourier Transform Algorithm (SSFTM) used to solve partial differential nonlinear Schrödinger equation (NLSE).Then, we use it for simulating optical signal propagating in fiber by using MATLAB program, and designing fiber optic block could add it to MATLAB Simulink Library. Finally ,in this paper, we achieved results for selecting important parameters in single mode fiber for high bit rate, for improving bit error rate and Qcoefficient.
Studying is showed that the amount of exchanging information in the network
surprisingly grows due to developing new communication services. But, when data rates
increase the optical system performance degrades due to dispersion, which was taken in
to
account in this research. Where as the reduction of dispersion losses is important in optical
networks. Fiber Bragg Grating (FBG) is one of the most important components of optical
communication systems, and one of the effective methods used for this goal.
This article tests the effect of using FBG as dispersion compensator in optical
communication systems, where we simulate optical communication system using FBG.
And study the effect of Erbium Doped Fiber Amplifier (EDFA) and FBG and fiber optic
parameters on this system performance, and it has been finding the best values of the
system parameters. Which the simulation model depended on two Optisystem7 and Matlab
software. We evaluate performance through eye diagram and two factors Q, Bit Error Rate
(BER).
The effect of thermal noise and shot noise on the receiver sensitivity in a digital
optical communication system will be studied and analyzed. Also, the positive and
negative effects of Parameters on the receiver sensitivity will be highlighted. Th
e
programming tools (MATLAB) is used to study the relationship between the receiver
sensitivity and bit rate. It showed that the shot-noise-limited receiver sensitivity is much
better than the thermal -noise-limited receiver sensitivity with best 30dB. The study also
provided an explanation for the preference of optical detector (APD) compared to that in
(PIN) optical detector from sensitivity side due to its internal gain, this can be achieved
when the thermal noise is dominant. However, the preference of optical detector(PIN) will
be better in case of shot noise is dominant.
Analyzed results show that there is a significant improvement in the shot-noiselimited
receiver sensitivity for high quantum efficiency and high wavelength. However, the
sensitivity is deteriorated to get a lower error rate. The thermal -noise-limited receiver
sensitivity showed an improving by increasing the responsivity and the load resistance.
However, it decreases by increasing the number of noise and the error rate.
This research contains an analysis of performance of multiple
access protocols when using for satellite channel to connect between
earth station(HUB) and VSAT through satellite .The performance
of those protocols has been compared through the foll
owing points:
1)the transmission power which is required by the earth station.
2) the transmission power which is required by the satellite's
transponder .
3)the require frequency bandwidth.
4)the maximum number of the earth stations in the network.
5)the delay which is caused by using those protocols.
This study has introduced head lines to choose the proper multiple
access protocol for the required service from the satellite channel
preserving the lowest cost to have the ideal performance for satellite
channel.
Voice over IP Protocol is an important Internet voice connection, characterized by high
quality of service. In this work, we will assess how today's Internet service matches its
expectations by examining the performance of the Voice over IP protoco
l and its quality of
service. We have relied on the method of selection of encoders first within some
parameters to obtain the simulation result of the comparison and analysis (QoS). Which we
adopted on VoIP protocols in the case of multiple users with three algorithms for the
symbols, and after determining the problem in this range, we took a number of factors into
account due to their impact on sound performance, such as jitter and Delay. This action
simulates three of the most common encoders (analog audio conversion and packet
compression), G.711, G.723.1 and G.729. The main objective is to achieve high-quality
sound performance by making the appropriate decision in the choice of sound encoder.
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