Abstract
Objective: To design 40 Gbps ultra-dense wavelength division multiplexed (DWDM) optical network for 32 and 64 channels. Methods: Proposed DWDM architecture supports three different advance modulation schemes with symmetrical dispersion compensation unit. Performance of proposed work has been investigated using parameters bit error rate (BER) and quality factor. For efficient analysis, we employ variation in channel spacing, transmission length of fiber and input laser power, which is resulted into some significant observations. Findings: Carrier Suppressed Return to Zero (CSRZ) scheme exhibits a good quality factor with maximum achievable distance up to 4250 km due to highest tolerance to nonlinear effects. Modified Duobinary Return to Zero (MDRZ) modulation scheme also provides a good quality factor with laser power variation due to high receiver sensitivity, but with limited reach upto 2750 km. While Duobinary Return to Zero (DRZ) scheme provides moderate transmission coverage up to 3750 km in comparison to CSRZ and MDRZ, with a lesser quality factor due to effect of Inter Symbol Interference (ISI). We observe that an increase in number of simultaneous users through the channels results into performance degradation. Application: This work delivers very huge data rate and good spectral efficiency to sustain the current high traffic growth. Keywords: Dispersion, Long Haul System, Optical Network, Symmetrical Compensation, DWDM
Highlights
Dense Wavelength Division Multiplexing (DWDM) is recognized all over the world, for satisfying major challenge of today’s telecommunication network, i.e., very high traffic demand, integrated services on same physical infrastructure and efficient bandwidth[1,2,3]
DWDM technology flourishes in presence of popular amplifier, i.e., Erbium Doped Fiber Amplifier (EDFA), which exhibits very wide spectral bandwidth
An ultra-dense WDM optical network is designed at 40 Gbps bit rate for 32 and 64 channels with high data rates 1.28 Tbps and 2.56 Tbps and high spectral efficiency with channel spacing 100 GHz and 75 GHz The proposed work is efficiently analyzed for different modulation schemes Carrier Suppressed Return to Zero (CSRZ), Duobinary Return to Zero (DRZ) and Modified Duo Binary Return to Zero (MDRZ) for symmetrical dispersion compensation technique
Summary
Dense Wavelength Division Multiplexing (DWDM) is recognized all over the world, for satisfying major challenge of today’s telecommunication network, i.e., very high traffic demand, integrated services on same physical infrastructure and efficient bandwidth[1,2,3]. A.Sheetal et al analyzed 40 Gbps long haul DWDM network with high capacity for CSRZ, DRZ and MDRZ advanced modulation schemes and pre, post and symmetrical dispersion compensation schemes[19]. An ultra-dense WDM optical network is designed at 40 Gbps bit rate for 32 and 64 channels with high data rates 1.28 Tbps and 2.56 Tbps and high spectral efficiency with channel spacing 100 GHz and 75 GHz The proposed work is efficiently analyzed for different modulation schemes CSRZ, DRZ and MDRZ for symmetrical dispersion compensation technique. Q factor is directly related with BER as BER This comprehensive study results into better understanding of advanced modulation schemes like CSRZ, DRZ and MDRZ in terms of key parameters BER and Q factor with variation in fiber length and laser power, corresponding into few interesting behavioral knowledge of these modulation schemes.
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