The maximum reach of the Dense Wavelength-Division-Multiplexed Passive Optical Network (DWDM-PON) system can be severely limited by chromatic dispersion (CD). This paper contains investigation long-reach high speed 16-channel DWDM-PON with efficient CD compensation methods. It is shown that has a crucial role for guaranteed downstream optical link performance and length system. results show usage additional 7 km long compensating fiber (DCF) placed in central office improves network 19.3%...

The dramatic growth of transmitted information in fiber optical networks is leading to a concern about the network latency for high-speed reliable services like financial transactions, telemedicine, virtual and augmented reality, surveillance, other applications. In order ensure effective engineering, delay variability needs be accurately monitored measured, control it. This paper brief describes causes metro networks. Several available reduction techniques solutions are also discussed,...

Chromatic dispersion (CD) has a significant impact on quality of transmitted optical signal in high-speed fiber optic communication systems with data rates up to 10 Gbit/s, and as result CD limits the maximum length transmission distance. In order operate system sufficiently low bit error ratio (BER) minimize performance degradation caused by pulse distortion broadening, compensation is needed. this work using OptSim simulation software we realize an experimental WDM model new combined...

The upper transmission range of the wavelength division multiplexing passive optical network (WDM-PON) can be restricted by chromatic dispersion (CD). This paper contains investigation till 16-channel WDM-PON system with efficient CD pre-compensation and post-compensation methods. It is shown that offset has a marginal role for guaranteed link downstream performance maximum length high-speed system. results show employment extra 7 km long compensating fiber (DCF) placed in central office...

Chromatic dispersion (CD) has a significant impact on quality of transmitted optical signal in high-speed fiber optic communication systems with data rates up to 10 Gbit/s, and as result CD limits the maximum length transmission distance. In order operate system sufficiently low bit error ratio (BER) minimize performance degradation caused by pulse distortion broadening, compensation is needed. this work using OptSim simulation software we realize an experimental WDM model new combined...

Mixed-Line Rate (MLR) is a cost efficient solution to cope with the rapidly increasing and heterogeneous Internet traffic. In MLR-based scenario wavelength channels are organized in groups (i.e., sub-bands), each of which consisting operating at same rate, e.g., it possible have on fiber link subbands 10 Gbps, 40 100 Gbps. order increase spectral efficiency one can reduce not only channel spacing within sub-band but also frequency between sub-bands different rates, i.e., spacing. On other...

To combine the benefits and compensate for drawbacks of different optical amplifier types, a hybrid can be composed. The authors consider two most frequently used amplifiers that provide better performance: semiconductor (SOA), an erbium doped fiber (EDFA), both in combination with distributed Raman (DRA). compare performance amplifiers, eye diagrams detected signals were analyzed maximum transmission distances found. results obtained show even under conditions advantageous SOA-DRA hybrid,...

The influence of nonlinear optical effects to the NRZ and RZ modulation methods parameters dependence in WDM systems have been studied with OptSim 4.6 simulation software. obtained results show effect dependency on dispersion input power levels methods. SPM occur more RZ, but FWM occurs near zero value. New generated harmonics peak is two times lower systems. will be reduced, if channel interval at least greater than 100 GHz. Ill. 8, bibl. 6 (in English; summaries English, Russian Lithuanian).

The spectrum sliced dense wavelength division multiplexed passive optical network (SS-DWDM PON) is a cost effective and power efficient solution for access networks to satisfy the growing worldwide demand transmission capacity. In this paper we successfully demonstrate investigation of 16 channel high-speed SS-DWDM PON system with data rate 2.5 Gbit/s per where broadband ASE source realized using two EDFA amplifiers in cascade mode. Originally resulting on output irregular manipulation...

The authors have investigated the most efficient realization of mixed chromatic dispersion (CD) compensation schemes for high speed combined density wavelength division multiplexing (HDWDM) systems. This research is performed with OptSim 5.1 simulation software. In this it shown that scheme has a crucial role guaranteed performance in HDWM transmission channels. Dispersion management strategy needed when increasing bit rate per channel by factor four. Therefore, CD must be found realized...

The increased demand of mobile broadband consumers on services in the environment with high data rate and technologically developed communication systems will require more spectrum to be available future. new technologies as well existing frequencies for their development. authors investigate potential future terrestrial frequency bands - worldwide Europe. An insight into management is provided, radio access technologies, methods efficient use cross-border coordination also addressed. It...

Abstract The 694-790 MHz (700 MHz) band was allocated by the 2012 World Radiocommunication Conference (WRC-12) in ITU Region 1 (Europe included), to mobile service on a co-primary basis with other services which this primary and identified for International Mobile Telecommunications (IMT). At same time, countries of will be able also continue using these frequencies their broadcasting if necessary. This allocation effective immediately after 2015 (WRC-15). In order make best possible use...

In this paper we successfully demonstrate the reach improvement of spectrum-sliced dense wavelength-division-multiplexed passive optical network (SS-DWDM PON) where amplified spontaneous emission (ASE) source is used as a seed light. Investigated system built on ITU-T DWDM frequency grid, defined in recommendation G.694.1 and therefore it potentially much more compatible with other already existing WDM PON systems. way possible to replace classic our proposed extended-reach reduce complexity...

Efficient Wavelength Filters for DWDM SystemsThe authors investigate the best parameters of optical filters dense wavelength division multiplexing (DWDM) systems. The investigation is based on OptSim 5.0 simulation software using method solving a complex set differential equations taking into account and electrical noise as well linear nonlinear effects. It shown that bandwidth filter extends data transmission speed increases, most efficient are Supergaussian Raised Cosine band-pass filters....

This paper contains the investigation of 8-channel wavelength-division-multiplexed passive optical network by using spectrum-sliced amplified spontaneous emission (ASE) source as a seed light with arrayed-waveguide gratings (AWGs). There are investigated impact signal filtering for Gaussian and Flat-top type AWGs on overall system's performance. It is shown that AWG's channel interval 100 GHz not suitable SS-WDM PON systems high data rate - 2.5 Gbit/s because wide spectral shape crosstalk....

The authors seek best ways to realize chromatic dispersion (CD) compensation schemes for differently modulated optical signals in high-speed mixed data rate HDWDM systems.The research is based on OptSim 5.1.simulation software, which numerically solves nonlinear Schrödinger equation using the split-step Fourier method.It shown that CD scheme crucial performance evaluation combined HDWM transmission channels.Therefore, a of type proposed suited very complicated fiber system.It also found...

The spectrum sliced dense wavelength division multiplexed passive optical network (SS-DWDM PON) is a cost effective and power efficient solution for access networks to satisfy the growing worldwide demand transmission capacity. Originally resulting ASE on output of EDFA irregular manipulation with parameters must be done make it more flat. Flat source an important premise achieve minimal level fluctuations obtained channels after slicing operation provide stable data BER<;10 <sup...

Simultaneous propagation of different modulation formats in WDM systems are evaluated numerically with OptSim simulation software at a bit rate 2.5 Gbit/s and 10 using 80 km fibre length. The obtained results show the flexibility mixed networks usability futures solutions. Ill. 7, bibl. 5 (in English; summaries English, Russian Lithuanian).

By the reduction of channel spacing in WDM system, it's possible to add some extra channels it and that way increase total transmission capacity used fibre postpone bottleneck effect core networks. But using alternative modulation formats, such as differential phase shift keying with non - return zero coding (NRZ DPSK) or two states polarization (2 POLSK), instead traditional on off NRZ OOK), achieve lower bit error ration BER level channel's tolerance impairments, inter-channel...

In the last decade due to growing demand on high capacity transmission, DWDM transmission systems have evolved rapidly. The growth of speed and decrease in channel spacing has resulted stricter requirements elements used optical signal process, including amplifiers. this article we take one most popular solutions – a 10 Gbit/s 16 NRZ-OOK 50 GHz system, implement SOA RA as single in-line amplifier, order estimate compare their performance, identify main factors that limit total quality both...

In the work, characteristics of erbium-doped fiber amplifier (EDFA) are investigated. The amplification and noise figure dependences on different EDFA parameters in a 2.5 Gbit/s one-channel WDM transmission system simulated measured. Additionally, simulation four-channel containing in-line amplifiers type was done order to investigate performance multichannel systems. Almost identical results obtained for both model experimental indicative high accuracy simulation. It is shown that depends...

Mixed-Line Rate (MLR) in a cost-efficient manner scope with the heterogeneous nature of constantly increasing traffic demands core networks. In same time, telecom operators have to decide how introduce into system new 10G, 40G, and/or 100G channels regarding (i) data requests, (ii) utilization available network resources such as fiber frequency band, and (iii) an overall power consumption that even more increases due extra signal regeneration required because higher spectral efficiency....

This paper contains the investigation of reach improvement dense wavelength-division-multiplexed passive optical network (DWDM-PON) using spectrum-sliced amplified spontaneous emission (ASE) source as a seed light. It is shown that flat-top AWG unit provides excellent channel separation and filtering at same time passing sufficient high power from spectrally sliced ASE broadband light source. The maximum (SS-DWDM PON) system with data transmission speed 2.5 Gbit/s can be fairly limited by...