scholarly journals Optical splitter design for telecommunication access networks with triple-play services

2018 ◽  
Vol 69 (1) ◽  
pp. 32-38 ◽  
Author(s):  
Rajdi Agalliu ◽  
Catalina Burtscher ◽  
Michal Lucki ◽  
Dana Seyringer
Keyword(s):  
Optical Networks ◽  
Bit Error Rate ◽  
Time Domain ◽  
Access Networks ◽  
Q Factor ◽  
Step Method ◽  
Power Split ◽  
Triple Play ◽  
Triple Play Services

Abstract In this paper, we present various designs of optical splitters for access networks, such as GPON and XG-PON by ITU-T with triple-play services (ie data, voice and video). The presented designs exhibit a step forward, compared to the solutions recommended by the ITU, in terms of performance in transmission systems using WDM. The quality of performance is represented by the bit error rate and the Q-factor. Besides the standard splitter design, we propose a new length-optimized splitter design with a smaller waveguide core, providing some reduction of non-uniformity of the power split between the output waveguides. The achieved splitting parameters are incorporated in the simulations of passive optical networks. For this purpose, the OptSim tool employing Time Domain Split Step method was used.

Modeling and Techno-Economic Evaluations of WDM-PONs

2010 ◽  
pp. 231-256
Author(s):  
Jürgen Schussmann ◽  
Thomas Schirl
Keyword(s):  
Optical Networks ◽  
Access Networks ◽  
Economic Evaluations ◽  
Network Architectures ◽  
Wavelength Division ◽  
Wavelength Division Multiplexed ◽  
High Data ◽  
Data Rates ◽  
Triple Play ◽  
Triple Play Services

In the near future, broadband access networks will be required with data rates of over 1Gbit/s per customer. Currently, time-division multiple access passive optical networks (TDMA-PONs) are deployed. However, TDMA-PONs cannot keep up with the requirements for the broadcasting of a great number of HDTV channels and the unicasting of several triple-play services (voice, data and video). In contrast, wavelength-division-multiplexed PONs (WDM PONs) will be able to provide these required high data rates per user causing higher costs than with TDM-PONs. The introduced paradigm shift, at least one wavelength per service and user, leads to the introduction of new aspects in the design of future WDM PON access networks. In techno-economic evaluations, new network architectures with the highest potential concerning economic considerations have been identified. Access to these newly identified network architectures will prompt market introduction as well as market penetration helping Fiber-tothe- Home (FTTH) to become reality.

Μεθοδολογία προσομοίωσης δρομολόγησης πραγματικού χρόνου σε οπτικά δίκτυα με ατέλειες φυσικού στρώματος

2009 ◽  
Author(s):  
Βασίλειος Αναγνωστόπουλος
Keyword(s):  
Quality Of Service ◽  
Optical Networks ◽  
Bit Error Rate ◽  
Phase Modulation ◽  
Routing And Wavelength Assignment ◽  
Four Wave Mixing ◽  
Wavelength Assignment ◽  
Wave Mixing ◽  
All Optical

Η Διατριβή επικεντρώνεται στη μελέτη αλγορίθμων online δρομολόγησης και παροχής Ποιότητας Υπηρεσίας (Quality of Service) σε δίκτυα ΑΟΝ (All Optical Networks) WDM τα οποία χρησιμοποιούν το σχήμα MPλS (Multi-Protocol Lambda Switching). Αναπτύσσεται η θεωρία δρομολόγησης κάτω από impairments (ατέλειες φυσικού στρώματος) με έμφαση τα μη-γραμμικά φαινόμενα και ειδικά τα φαινόμενα FWM (Four Wave Mixing) και XPM (Cross Phase Modulation). Δίνεται έμφαση στην αποτελεσματική διαχείριση και τον υπολογισμό των σταθερών οι οποίες χρησιμοποιούνται για την μοντελοποίηση των διαφόρων φυσικών διεργασιών οι οποίες αλλοιώνουν το σήμα και οδηγούν σε μείωση του BER (Bit Error Rate) του συνδέσμου και κατ’ επέκτασιν τη χειροτέρευση της ποιότητας υπηρεσίας. Σε ένα τέτοιο πλαίσιο σχεδιάζεται και προτείνεται ένας προσομοιωτής ο οποίος με βάση προσεγγιστικά αναλυτικά μοντέλα μπορεί και προσομοιώνει μια πληθώρα αλγορίθμων RWA (Routing and Wavelength Assignment) για τη σύγκριση των υπαρχόντων προσεγγίσεων με τις προτεινόμενες από τον συγγραφέα. Κεντρικό στοιχείο της διατριβής είναι η αυτόνομη διαχείριση του δικτύου και η αύξηση με ευφυείς μεθόδους δρομολόγησης της περιοχής διαφάνειας του δικτύου κάτω από πραγματικές συνθήκες και όχι με τη σχεδίαση χειρότερης περίπτωσης. Με αυτόν τον τρόπο αυξάνεται η εκμετάλλευση του υπάρχοντος εύρους ζώνης του δικτύου χωρίς την ανάγκη εγκατάστασης νέου για να αντιμετωπιστούν οι ατέλειες φυσικού μέσου. Τέλος μελετάται η ελαχιστοποίηση της παρέμβασης του διαχειριστή με χρήση της αυτόματης δρομολόγησης και ανάθεσης μήκους κύματος που προσφέρεται από εξελιγμένους αλγορίθμους. Τα αποτελέσματα δικαιολογούνται με εκτενείς προσομοιώσεις.

Bandwidth Allocation Methods in Passive Optical Access Networks (PONs)

2010 ◽  
pp. 123-145
Author(s):  
Noemí Merayo ◽  
Patricia Fernández ◽  
Ramón J. Durán ◽  
Rubén M. Lorenzo ◽  
Ignacio de Miguel ◽  
...  
Keyword(s):  
Optical Networks ◽  
Bandwidth Allocation ◽  
Medium Access Control Protocol ◽  
Access Networks ◽  
Dynamic Bandwidth Allocation ◽  
Medium Access ◽  
Traffic Conditions ◽  
Time Division ◽  
Dynamic Bandwidth

Passive Optical Networks (PONs) are very suitable architectures to face today’s access challenges. This technology shows a very cost saving architecture, it provides a huge amount of bandwidth and efficiently supports Quality of Service (QoS). In PON networks, as all subscribers share the same uplink channel, a medium access control protocol is required to provide a contention method to access the channel. As the performance of Time Division Multiplexing Access (TDMA) protocol is not good enough because traffic nature is heterogeneous, Dynamic Bandwidth Allocation (DBA) algorithms are proposed to overcome the problem. These algorithms are very efficient as they adapt the bandwidth assignment depending on the updated requirements and traffic conditions. Moreover, they should offer QoS by means of both class of service and subscriber differentiation. Long-Reach PONs, which combine the access and the metro network into only one by using 100 km of fibre, is an emergent technology able to reach a large number of far subscribers and to decrease the associated costs.

scholarly journals Modified GIANT Dynamic Bandwidth Allocation Algorithm of NG-PON

2017 ◽  
Vol 13 (1) ◽  
pp. 15 ◽  
Author(s):  
Tomas Horvath ◽  
Petr Munster ◽  
Josef Vojtech ◽  
Ondrej Havlis
Keyword(s):  
Optical Networks ◽  
Bandwidth Allocation ◽  
Dynamic Bandwidth Allocation ◽  
Backward Compatibility ◽  
Triple Play ◽  
Triple Play Services ◽  
The Cost ◽  
Dynamic Bandwidth ◽  
Allocation Algorithms ◽  
Transmission Status

Gigabit passive optical networks have been widely deployed due to the fact that the cost of their implementation is still decreasing. What is more important, we are facing theproblem with increasing demands on the transmission bandwidth. Regarding this issue, the ITU develops another two standards supporting higher downstream bitrate. The XG-PON standard is the first platform under the developing, and the NG-PON2 is the second standard. The first one provides compatibility and increases the downstream capacity of 10 Gbit/s and the second standard has the same assumptions, but does not have backward compatibility. In this article, we discuss only XG-PON networks. We choose amendment as the dynamic bandwidth allocation algorithms, and we have compared it with the original specification and with our modification. The primary intention of that modification is to reduce the delay of Triple Play (data, video, and voice) services. These services are represented by TCONT (Transmission Container), which is used to improve the PON system upstream bandwidth allocation and transmission status dynamically. As NS-3 simulator does not support the direct mapping of Triple Play services into T-CONT and their labeling. We focus on a delay value for Triple Play services which was reduced by own modification in a GIANT algorithm. On the other hand, we cannot reduce the delay value for VoIP services because it has the highest priority by T-CONT.

Performance Evaluation of Optical Networks Using Advanced Modulation Format

2018 ◽  
Vol 37 ◽  
pp. 72-77
Author(s):  
Simbarashe Magidi
Keyword(s):  
Performance Evaluation ◽  
Optical Networks ◽  
Network Performance ◽  
Optical Network ◽  
Passive Optical Network ◽  
Maximum Distance ◽  
Q Factor ◽  
Modulation Format ◽  
Triple Play ◽  
Eye Opening

In this paper, we have evaluated the performance of DPSK advanced modulation format in a bidirectional passive optical network for a triple play scenario at a constant symmetrical data rate of 10 Gbps. Data, voice and video signal has been successfully transmitted to a maximum of 128 users for a maximum distance of 100 km. Network performance was measured in terms of the Q factor, BER and eye opening, as a function of the number of users and distance of reach.

Investigation of Performance Affecting Parameters on Hybrid Passive Optical Networks

2020 ◽  
Vol 41 (2) ◽  
pp. 167-170
Author(s):  
Anil Kumar ◽  
Rajneesh Randhawa
Keyword(s):  
Optical Networks ◽  
Bit Error Rate ◽  
Error Rate ◽  
Fiber Length ◽  
Passive Optical Networks ◽  
Q Factor ◽  
Hybrid Wave ◽  
Data Rates ◽  
Length Data ◽  
Time Division

AbstractIn the evolvement of current passive optical networks (PONs), there is ever increasing bandwidth demand due to dynamic service requirements. This introduces challenge for the choice of multiplexing technique and physical layer bounds like fiber length, data rate, and number of users are critical over a suitable architecture. In this article, hybrid wave division multiplexing-time division multiplexing PON is analyzed using variable length of fiber with data rates up to 40 Gbps over a maximum of 128 end users. Comparative study using different frequency spacing’s has shown that it has negligible effect on the Q-factor performance parameter. Further in the work, variable data rates required for different services is successfully transmitted up to 30 km to 128 number of users for an acceptable level of bit error rate.

PERFORMANCE ANALYSIS OF EXP-BET ALGORITHM FOR TRIPLE PLAY SERVICES IN LTE SYSTEM

2016 ◽  
Vol 78 (5-8) ◽  
Author(s):  
Ku Siti Syahidah Ku Mohd Noh ◽  
Darmawaty Mohd Ali ◽  
Zin Mar Myo ◽  
Ahmad Kamsani Samingan ◽  
Abdul Aziz Abdul Rahman ◽  
...  
Keyword(s):  
Real Time ◽  
Loss Rate ◽  
Proportional Fairness ◽  
Fairness Index ◽  
Traffic Characteristics ◽  
Triple Play ◽  
Triple Play Services ◽  
Real Time Application ◽  
Made In

Quality of Service (QoS) is defined as user’s satisfaction towards service performance that has been offered to them. Due to different traffic characteristics and QoS requirements of real-time and non-real-time services, thus provisioning the QoS requirements has become a challenge. In this study, we have compared our proposed algorithm namely the Exponential Blind Equal Throughput (EXP-BET) towards the Exponential Proportional Fairness (EXP-PF) and Frame Level Scheduler (FLS). The comparisons have been made in terms of fairness index, throughput,packet loss rate (PLR) and delay. From the simulation results, it is observed that EXP-BET delivers higher fairness and throughput and lower PLR and delay for real-time application. Instead, EXP-BET shows 17.72% improvement than FLS and 7.52% from EXP-PF in term of fairness index for the non-real-time application.

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