Optimisation of dispersion compensating in a long-haul fibre for RF transmission of up to 100 Gbit/s by using RZ and NRZ formats

Abstract

With the recent data rate increase it is very challenging to build a fibre optic network that would enable a high data rate transmission over a long haul distance. The signal suffers large degradation over a certain distance due to distortion by the nonlinear effects of the optical fibres. In particular, transmission of high data rates over existing fibre optic systems, while keeping the cost low, avoiding an increase of the system's complexity and the usage of expensive devices, would be a very challenging task. In this paper, we address this problem by increasing the transmission distance in the fibre optic links for up to 2500km. We have used Standard Single Mode Fibre (SSMF) and Dispersion Compensation Fibre (DCF), where DCF is used as a loss compensator in Radio-Over-Fibre (RoF) systems. A mixture combination of the pre, post and symmetrical fibre compensation schemes were developed to overcome the dispersion in the fibre. We have found that in order to achieve high RF over fibre optic system performance for high data rates and long transmission, there is a requirement to upgrade the optical configuration scheme in a proportional way, by raising the length of the fibre span, compensation span and amplification. We have reported optimised RF over fibre configuration schemes that would have a great impact on reducing the cost, reducing the system's complexity and avoiding usage of expensive devices, in order to achieve high data rate transmission over existing fibre optic systems.

Comparative analysis of long-haul system based on SSB modulation utilising dual parallel Mach–Zehnder modulators

“…3 covers transmitter, fibre optic link and receiver. The main components in the transmitter are; continuous wave (CW) laser of 1550nm, with line width of 0.1(MHz), linked with RF signal on the DP-DDMZMs, which covers various compensation schemes developed by (Miziya et al 2013;Gupta et al 2012;Paloi et al 2017) to overcome the dispersion in the fibre and receiver. We will assume a cut off frequency of 0.75 (bitrate).…”

“…In the RoF system, the fibre dispersion induced power fading can be resolved by using the OSSB (Niknamfar and Shadaram 2013;Cui et al 20012). Prior to generating simulation results using VPI and Optisystem simulation software, we benchmarked our simulations with experimental results published (Devgan et al 2012;Xu et al 2015), based on the linearization and harmonic distortion of the photonic link and other published work for dispersion compensation (Paloi et al 2017;Xu et al 2015). When we compare our results with other published based modulation schemes, the maximum achieved transmission length goes up to 2400(km), as illustrated in Fig.…”

“…The link parameters used by both configurations have certain similarities such as; Standard Single Mode Fibre (SSMF), with attenuation of 0.2 (dB/km) and dispersion of 16 [ps/(nm.km)]. The DCF is used as a dispersion compensator, per the link length, with attenuation of 0.5 (dB/km) and dispersion of -80 [ps/(nm.km)] (Paloi et al 2017;Eappen et al 2014). Each fibre span is amplified per the transmission length with Erbium-Doped Fibre Amplifier (EDFA) and 6(dB) noise figure.…”

“…Thus, the result is consistent with our VPI simulations. Furthermore, to analyse the transmission performance of the generated OSSB signal, we have performed a comparison between the standard modulation scheme carried out by (Paloi et al 2017), and the proposed OSSB modulation in a RoF System link at various distance at the SSMF, using a combination of the three compensation channel link schemes used by (Paloi et al 2017).…”

Investigation of Different Modulation Formats for Extended Reach NG-PON2 using RSOA

“…The article investigates the performance of residual dispersion, dispersion tolerance and spectral efficiency, for correlative coding using NRZ and RZ for intensity modulation using direct detection an coherent receiver for 40 Gbps data transmission for 30 km Standard Mode Fibre (SMF) [8]. Using SMF and Dispersion Compensation Fiber (DCF) design composition of pre, post and symmetrical fiber composition, they achieved high data rate and long transmission over existing fibre optic systems [9]. Demonstration of 100G-PON based on NRZ transmission using Germanium and Silicon Avalanche Photo detector (APD) proved sufficient power budget for high data rate transmission [10].…”