Effects of Amplified Spontaneous Emission (ASE) on NRZ, RZ and CSRZ modulation formats in single channel light-wave system

Kaur, Jeevanjyot; Sharma, Neeraj

doi:10.1109/etncc.2011.5958487

Cited by 9 publications

(7 citation statements)

References 6 publications

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“…We have shown that the amplifier gains for the SMF's and DC fibre needs to be adjusted in order to achieve the appropriate Q-Factor. We have found out that the transmitted RF signal will be degraded after a certain distance by repeated amplifications, because of the added noise to the link due to an amplified spontaneous emission (ASE) [31]. Taking into consideration all practical aspect of the existing link structure, the use of NRZ and RZ modulation schemes enables us to come to the conclusion that RZ is the best choice for achieving the longest distance for the aforementioned bitrate.…”

Section: Resultsmentioning

confidence: 99%

“…In this study we are using DCF to compensate for dispersion and we have upgraded and optimised the RF configuration scheme from basic to more advanced in order to investigate its performance. There are negative effects during the compensation, specifically nonlinearities [29] such as signal degradation caused from the combined effect of group velocity and accumulated emission noise caused from periodic amplification [30,31]. The system performance depends on the following factors; fibres input power, the optical system configuration and residual dispersion.…”

Section: Dispersion Compensation Schemementioning

confidence: 99%

“…Rapid Q-Factor decline is seen by increasing the link distance, where related Q-Factor penalties are shown in Fig.7. For the long haul transmission Q-Factor penalties are evident because of the additive and multiplicative noise component added to the signal called amplified spontaneous emission (ASE) [31]. Every time we amplify the signal, EDFA inserts to the noise power spectral density (PSD) [30].…”

Section: Performance Analysismentioning

confidence: 99%

“…For example, for the modulation format of NRZ, 80 GB/s, 960km, we can only use higher than a 50km span, the use of 25km span length will cause much more losses, where achieved Q-Factor value is lower than the margin line of BER10 -9 , because of this, and after a certain distance, it is necessary to amplify the signal. During each time signal is amplified, OSNR degrades because the noise is added to the signal, which is called amplified spontaneous emission (ASE) [31]. Each EDFA inserts to the noise power spectral density (PSD) due to the generation of more ASE [30].…”

Section: Comparison Of Both Proposed Configuration Schemesmentioning

confidence: 99%

See 3 more Smart Citations

Optimisation of dispersion compensating in a long-haul fibre for RF transmission of up to 100 Gbit/s by using RZ and NRZ formats

Paloi

Mirza

Haxha

2017

Optik

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With the recent data rate increase it is very challenging to build a fibre optic network that would enable a high data rate transmission over a long haul distance. The signal suffers large degradation over a certain distance due to distortion by the nonlinear effects of the optical fibres. In particular, transmission of high data rates over existing fibre optic systems, while keeping the cost low, avoiding an increase of the system's complexity and the usage of expensive devices, would be a very challenging task. In this paper, we address this problem by increasing the transmission distance in the fibre optic links for up to 2500km. We have used Standard Single Mode Fibre (SSMF) and Dispersion Compensation Fibre (DCF), where DCF is used as a loss compensator in Radio-Over-Fibre (RoF) systems. A mixture combination of the pre, post and symmetrical fibre compensation schemes were developed to overcome the dispersion in the fibre. We have found that in order to achieve high RF over fibre optic system performance for high data rates and long transmission, there is a requirement to upgrade the optical configuration scheme in a proportional way, by raising the length of the fibre span, compensation span and amplification. We have reported optimised RF over fibre configuration schemes that would have a great impact on reducing the cost, reducing the system's complexity and avoiding usage of expensive devices, in order to achieve high data rate transmission over existing fibre optic systems.

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Section: Resultsmentioning

confidence: 99%

Section: Dispersion Compensation Schemementioning

confidence: 99%

Section: Performance Analysismentioning

confidence: 99%

Section: Comparison Of Both Proposed Configuration Schemesmentioning

confidence: 99%

See 2 more Smart Citations

Optimisation of dispersion compensating in a long-haul fibre for RF transmission of up to 100 Gbit/s by using RZ and NRZ formats

Paloi

Mirza

Haxha

2017

Optik

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“…In DWDM systems, the transmission distance is mostly restricted by two factors. One is the degradation of Optical Signal to Noise Ratio (OSNR) due to Amplified Spontaneous Emission (ASE) generated by the optical amplifier [15]. The other is degradation arising from the nonlinear effects of the optical fiber [16].…”

Section: Introductionmentioning

confidence: 99%

1b/s/Hz spectrally efficient transmission for an 8 channel RZ modulated DWDM systems

Vij

Sharma

2014

Proceedings of the 2014 International Conference on Control, Instrumentation, Energy and Communication (CIEC)

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The core of the global telecommunication network consists of wavelength division multiplexed (WDM) optical transmission systems. WDM is the technology of choice as it allows for a high spectral efficiency. We propose an effective way to counter the nonlinearities like Four Wave Mixing and Cross Phase Modulation to achieve the spectral efficiency of 1 b/s/Hz using RZ modulation format. We use the concept of nonuniform channel spacing and nonuniform power assignment between adjacent channels of the DWDM system. We have simulated an 8 channel DWDM lightwave system with bit rate of 25 Gb/s and channel spacing of 25 GHz.

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Comparative analysis of long-haul system based on SSB modulation utilising dual parallel Mach–Zehnder modulators

Paloi

Haxha

2018

Opt Quant Electron

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In this paper, we have proposed a long-haul optical transmission system, based on a single sideband (SSB) modulation scheme. Analytical and simulation models have been developed, optimised and demonstrated for the proposed SSB system configurations. The SSB modulation scheme was proposed to overcome dispersion in the fibre. We have shown that the related link losses can be minimized by increasing the quality of the optical signal at the modulation. We have optimised the radio over fibre (RoF) configuration scheme based on Dual Parallel Dual Drive Mach Zehnder Modulator (DP-DDMZM), thereby increasing transmission length of the fibre. With the proposed SSB, by suppressing some of the harmonics and cancelling one of the sidebands, we have halved the RF power fading and interference. The developed analytical (theoretical/mathematical) model agrees very well with the simulation results using two (both) different commercial simulation tools. The optical signal is boosted while minimizing the number of repeaters. We report a SSB configuration, compensation and amplification with individual spans of 150 km, by extending the length of the link up to 3250km. The proposed system configuration exhibits high performance with less complexity and lower cost.

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Effects of Amplified Spontaneous Emission (ASE) on NRZ, RZ and CSRZ modulation formats in single channel light-wave system

Cited by 9 publications

References 6 publications

Optimisation of dispersion compensating in a long-haul fibre for RF transmission of up to 100 Gbit/s by using RZ and NRZ formats

Optimisation of dispersion compensating in a long-haul fibre for RF transmission of up to 100 Gbit/s by using RZ and NRZ formats

1b/s/Hz spectrally efficient transmission for an 8 channel RZ modulated DWDM systems

Comparative analysis of long-haul system based on SSB modulation utilising dual parallel Mach–Zehnder modulators

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