Abstract It is known that the high bandwidth demands are accomplished by deploying the concept of wavelength division multiplexing in optical networks which involves the transmission of multiple wavelength signals spaced very close to each other. Due to closely spaced wavelengths, the signal power of one channel phase modulates the adjacent channel which in turn produces nonlinear effects such as cross-phase modulation (XPM), self-phase modulation (SPM) and four-wave mixing (FWM). Thus, in this paper, PC-DCF (pre-compensating dispersion compensating fiber) technique has been demonstrated and evaluated in the transmission link to compensate the XPM effects, and this result seems to significantly enhance w.r.t. transmission performance and system capacity considering performance metrics such as Optical Signal to Noise Ratio (OSNR), bit rate, Q-factor and bit error rate (BER). It is evident from the simulation results as well as through mathematical modeling that the proposed technique (PC-DCF) provides optimum results at the channel spacing of 100 GHz, bit rate of 10 Gbps and input power of 5 mW which collectively provides a 5 dB increase in OSNR as compared to the existing compensating technique.

To Mitigate the Effect of Cross-Phase Modulation by Employing PC-DCF Technique in Multi-Tone RoF System

In this paper, validation of simulation results through analytical modelling has been presented to compensate the impact of non-linear transmission impairments such as Self-Phase Modulation (SPM), Four-Wave Mixing (FWM) and Cross-Phase Modulation (XPM)in RoF (Radio over Fiber) system. An analytical model has been designed and validated with the simulation results. The proposed analytical model utilizes SSP (Symmetrical-Symmetrical-Post), Bessel filter and PC-DCF (Post Compensating-Dispersion Compensation Fiber) compensation techniques in the transmission channel to mitigate SPM, FWM and XPM effects in RoF system. The simulation results indicate a reasonable improvement in OSNR by 2dB and by 5dB by using SSP and PC-DCF compensation technique. In addition to these results, reduction in FWM sideband power has been analyzed by 4dBm by the incorporation of Bessel Filter in the transmission channel. Through analytical modelling, it is seen that the simulation results obtained are in close proximity for compensating non-linear transmission effects such as SPM, FWM and XPM.

To compensate RoF non-linear transmission impairments: Simulation vs Analytical modeling

This paper investigates the optimum dispersion mapping for 40Gbps WDM system. The paper shows the performance of five channel WDM system with the channel spacing of 100GHz (0.8nm) by using non-zero dispersion shifted fiber (NZDSF) and dispersion compensation fiber (DCF). In addition it reveals both pre-compensation and residual dispersion per span can develop the performance. The modulation format used is RZ with 33% duty cycle. The optimum dispersion mappings for different channel numbers are discussed with different residual dispersions. By applying the optimum dispersion mapping, the impairments in the system can be minimized effectively .The analysis is done with OptiSystem software. Index Terms- cross-phase modulation (XPM), dispersion compensation fiber (DCF), non-zero dispersion fiber (NZDSF), wavelength division multiplexing (WDM), residual dispersion

http://www.ijsrp.org/research-paper-0514/ijsrp-p29134.pdf

Thin Thin Naing

Papers

Optimized Dispersion Mapping Scheme for five channel WDM system