Effects of Laser Linewidth on the Performance of DP-QPSK DWDM System
-
Neeraj Sharma
,
Sunil Agrawal
Abstract
This paper analyzes the effects of laser linewidth on the performance of eight-channel dual-polarization quadrature phase-shift keying (DP-QPSK) dense wavelength division multiplexing (DWDM) transmission at 50 GHz channel spacing. The performance of differential encoding and Gray coding is compared with the system without any coding for the DP-QPSK DWDM system. It is shown that the differentially-encoded system performs better for lasers with linewidth (∆ν) greater than 0.04 MHz compared to the system with Gray coding and system without any coding. However, for lasers with linewidth lesser than 0.04 MHz, the three systems considered here perform equally and there is no need for differential or Gray coding in such a case. It is also shown that if we apply frequency offset estimation (FOE) before adaptive equalization (AE) in the digital coherent receiver then it further improve the performance of the differentially encoded system with lasers sources having linewidth even greater than 0.1 MHz.
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© 2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
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Articles in the same Issue
- Frontmatter
- Amplifiers
- A Multistage High Performance Amplification Approach for Improving WDM Communication System
- Devices
- Design and performance analysis of all optical 4-bit parity generator and checker using dual-control dual SOA terahertz optical asymmetric demultiplexer (DCDS-TOAD)
- Micro-Ring Resonator-Based Sensors for Detection of Different Chemicals
- Quaternary Bit-Swap Logic with QPSK Signal Using Four Wave Mixing
- Fibers
- Comparative crosstalk performance analysis of different configurations of heterogeneous multicore fiber
- A Novel and Simple Formalism for Study of Effect of Kerr Nonlinearity on Petermann I and II Spot Sizes of Single-Mode-Graded Index Fiber
- Networks
- A controlled deflection routing and wavelength assignment based scheme in Optical Burst Switched (OBS) networks
- Experiment Study of Downstream Traffic Balancing Strategy on 40G Long Reach Coherent PON
- Reduction of Blocking Probability in Generalized Multi-Protocol Label Switched Optical Networks
- Performance Evaluation of Bidirectional Wavelength Division Multiple Access Broadband Optical Passive Elastic Networks Operation Efficiency
- Systems
- Evaluation of Atmospheric Detrimental Effects on Free Space Optical Communication System for Delhi Weather
- Design and Performance Investigations with Ultra High Speed Optical ALU
- Enhancement of Signals Characteristics with Least Effect of Optical Communication Losses for Dense Optical Communication Systems
- Performance comparison of code division multiple access and orthogonal frequency division multiplexing over turbulent effected free space optics link under the impact of advance coding formats
- Wavelength division multiplexing techniques based on multi transceiver in low earth orbit intersatellite systems
- Selection of suitable wavelengths for the dual-wavelength model of free space optics (FSO) systems for high-speed trains
- Effects of Laser Linewidth on the Performance of DP-QPSK DWDM System
