Significance of prechirping on long-haul path-averaged soliton impulse in re-circulating loop at 10 and 20 Gb/s with TOD

• Published in: Optik (Stuttgart) Vol. 120; no. 3; pp. 106 - 114
• Main Authors: Kumar, Manoj, Sharma, Ajay K., Kamal, T.S.
• Format: Journal Article
• Language: English
• Published: Reutlingen Elsevier GmbH 2009; Elsevier
• Subjects: Applied sciences; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Long-haul transmission; Nonlinear optics; Optical solitons; nonlinear guided waves; Optical telecommunications; Optics; Path-averaged soliton; Physics; Prechirping; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; TOD; Transmission and modulation (techniques and equipments); Valuation and optimization of characteristics. Simulation; TOD; Long-haul transmission; Prechirping; Path-averaged soliton; Performance evaluation; Second order; Pulse width; Chirp; Chirp pulse; Third order; Optical solitons; Line broadening; First order; Data transmission network; Optical communication; Long distance transmission; Optical pulse; Nonlinear optics; High rate transmission
• ISSN: 0030-4026; 1618-1336
• DOI: 10.1016/j.ijleo.2007.06.015

In this paper, we have investigated the performance of first- and second-order path-averaged soliton long-haul transmission link including the impact of third-order dispersion (TOD) at varied chirp. Here, the varied chirp is considered keeping in view the inadvertent frequency chirp imposed on all practical sources of short optical pulses. The propagation of strongly chirped pulses in loss-managed long-haul path-averaged soliton transmission network has been shown. The investigations reveal that in first-order (
N=1) path-averaged soliton transmission link at 10 and 20
Gb/s, SPM effect on the rising and falling edges of a pulse results in spectral broadening for all values of induced chirp. On the contrary, spectral narrowing of the pulses is observed in second-order negatively chirped path-averaged soliton pulses. The effect of the nonlinearity changes from narrowing to broadening of pulses if the sign of the initial chirp is changed to positive. The results ascertain that the system is capable of transmitting a pulse up to the distance of 24,500
km at bit rates of 10 and 20
Gb/s. Investigations have been carried out by varying the chirp factor in the range −1 to 1 and −1 to 0.4] for 10 and 20
Gb/s, respectively, to demonstrate the robustness of the long-haul soliton link. The observations establish that the pulse width (full-width at half-maximum (FWHM)) remains within the optimal range even at the transmission distance of 24,500
km without and at discrete values of the chirp factor.