Study of 40 Gbit/s Modulation Format to Upgrade 10 Gbit/s Long-Haul Transmission Systems with 50 GHz Channel Spacing

2006 ◽  
Author(s):  
Masahiro Daikoku ◽  
Itsuro Morita ◽  
Hideaki Tanaka
Keyword(s):  
Channel Spacing ◽  
Transmission Systems ◽  
Modulation Format

Impact of MPI and modulation format on transmission systems employing distributed Raman amplification

2001 ◽  
Vol 37 (15) ◽  
pp. 970 ◽  
Author(s):  
C.R.S. Fludger ◽  
Y. Zhu ◽  
V. Handerek ◽  
R.J. Mears
Keyword(s):  
Raman Amplification ◽  
Transmission Systems ◽  
Modulation Format

Effects of local oscillator on the performance of DP-QPSK WDM system with channel spacing of 37.5 GHz

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Neeraj Sharma ◽  
Sunil Agrawal ◽  
Vinod Kapoor ◽  
Sumit Budhiraja
Keyword(s):  
Optical Power ◽  
Local Oscillator ◽  
Narrow Channel ◽  
Laser Linewidth ◽  
Phase Shift Keying ◽  
Channel Spacing ◽  
Modulation Format ◽  
Quadrature Phase ◽  
Shift Keying ◽  
Frequency Grid

AbstractDual-polarization quadrature phase shift keying (DP-QPSK) modulation format is emerging as a main contender for 37.5 GHz frequency grid of WDM systems. However, the optical add drop multiplexers (OADMs) affect the performance of the system because of narrow channel spacing. The local oscillator (LO) is an important component of the digital coherent receiver. This paper analyzes the effects of LO parameter on the performance of the considered system. It is exhibited that optimum range of optical power and laser linewidth of the LO helps in improving the performance of the considered system.

COMBATTING NONLINEAR DISTORTION IN OPTICAL FIBRE TRANSMISSION SYSTEMS BY OPTIMUM DISPERSION COMPENSATION AND MODULATION FORMAT

2000 ◽  
Vol 09 (02) ◽  
pp. 227-234
Author(s):  
ARNE RØYSET ◽  
DAG ROAR HJELME
Keyword(s):  
Optical Fibre ◽  
Communication Systems ◽  
Dispersion Compensation ◽  
Design Guidelines ◽  
Optical Nonlinearities ◽  
Power Budget ◽  
Transmission Systems ◽  
Modulation Format ◽  
Transmission Distance ◽  
Optical Fibre Transmission

The use of optical amplifiers in optical fibre communication systems has led to a situation where optical nonlinearities has become a major system limitation in long repeaterless high bitrate transmission systems. In this paper we present results from numerical studies of the interaction between dispersion and self phase modulation in 10–40 Gbit/s systems and presents design guidelines for such systems. We have found that optimised dispersion compensation can reduce the distortion caused by optical nonlinearities, hence allowing higher power levels in the fibre and thereby increasing the power budget and transmission distance.

Modified Manchester modulation format for high-speed optical transmission systems

2018 ◽  
Vol 12 (4) ◽  
pp. 202-207 ◽  
Author(s):  
Festus Idowu Oluwajobi ◽  
Nguyen Dong-Nhat ◽  
Amin Malekmohammadi
Keyword(s):  
High Speed ◽  
Optical Transmission ◽  
Transmission Systems ◽  
Modulation Format ◽  
Optical Transmission Systems

Analysis of SDWDM Ring Network and Enhancement Using Different Hybrid Optical Amplifiers and Modulation Formats

2016 ◽  
Vol 37 (3) ◽  
Author(s):  
Vineet Anand ◽  
Anurag Sharma
Keyword(s):  
Wavelength Division Multiplexing ◽  
Performance Enhancement ◽  
Fiber Amplifier ◽  
Optical Amplifier ◽  
Ring Network ◽  
Channel Spacing ◽  
Modulation Formats ◽  
Erbium Doped Fiber Amplifier ◽  
Eye Diagram ◽  
Modulation Format

AbstractIn this paper, performance enhancement of super-dense wavelength division multiplexing (SDWDM) optical add–drop multiplexer optical ring network for six nodes, 50 wavelengths having channel spacing of 0.2 nm for 300 km unidirectional nonlinear fiber is successfully demonstrated. The performance of the designed system is enhanced by comparing different modulation formats (non-return to zero (NRZ), return to zero (RZ), soliton, chirped return to zero (CRZ), carrier-suppressed RZ (CSRZ)) and hybrid amplifiers (Erbium-doped fiber amplifier (EDFA)–EDFA, semiconductor optical amplifier (SOA)–SOA, SOA, EDFA, EDFA–SOA) on the basis of eye diagram and bit error rate (BER). It has been observed that CRZ modulation format and EDFA-SOA shows the best results. It has been reported that EDFA-SOA/CRZ modulation format can achieve BER as better as e-13, which gives best performance. The effect of channel spacing on SDWDM system and performance degradation due to crosstalk is also evaluated.

scholarly journals Investigation of EDFA Performance in DWDM Transmission Systems Under Different Operating Conditions

2019 ◽  
Vol 56 (2) ◽  
pp. 42-53
Author(s):  
J. Putrina ◽  
S. Olonkins ◽  
V. Bobrovs ◽  
J. Porins
Keyword(s):  
Operating Conditions ◽  
Power Penalty ◽  
Channel Spacing ◽  
Transmission Systems ◽  
Error Ratio ◽  
Bit Error Ratio ◽  
The Impact

Abstract The article investigates dependence of EDFA performance on its operating conditions. First of all, the impact of changes in channel spacing on the quality of the amplifier signal and on the desired EDFA configuration is observed – three different values of channel spacing are considered – 37.5 GHz, 50 GHz and 100 GHz. Afterwards, the impact of EDFA positioning on the quality of the amplified signal and the desired configuration is assessed. Three different EDFA positioning scenarios are considered – when the EDFA is used as a power booster, as an in-line amplifier and as a preamplifier. In all cases, such configuration of the EDFA is found that can ensure bit-error ratio (BER) values below 1·10−9 in all channels of the system. To assess the performance of the amplifiers, power penalty values are obtained in respect to identical transmission systems but without amplification.

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