Next Generation of High-Speed Optical Communications Networks Using OFDM Technology

Abstract

The usage of data transmission through Optical Fiber is highly preferred in every area where transferring of data is needed from one end to another. Moreover, nowadays the infrastructure of telecommunications is in good shape and size to handle data transmission through its optical fibers which have low attenuation and higher bandwidth. The seeking of data rate higher than 100Gbit/second and above has been increased to build it in urban and rural areas, and for long and short hauls. Consequently, the current goal is to propel this transmission system into the next appropriated level to avoid any decline of the optical infrastructure than its current capacity. To fulfill increased demand for bandwidth in Broadband services one of the most trusted technology is the Orthogonal Frequency Division Multiplexing (OFDM). The Orthogonal Frequency Division Multiplexing has been placed on-demand in optical communication, it is used in Long haul transmission Format in Direct and Coherent detection. OFDM has many features and abilities can boost the optical fiber performance by eliminating several limits of conventional Optical Fiber communication. OFDMA has polarization mode dispersion (PMD) and chromatic dispersion (CD) which are considered a big addition to the current systems. In addition to that, the easy correlation of the coherent optical OFDM with Wavelength Division Multiplexing (WDM) systems can further advantages in the transmission system such as super bandwidth, high spectral efficiency, and extra data rates. Furthermore, the WDM systems can improve data rate and capacity by using multiple wavelengths over a single fiber. This work aims to bring implementation and to perform a deep-dive study of higher data rates using Direct and Coherent Optical OFDM for long path transmissions. This research starts with a unique user and then extends to the add the OFDM - WDM system to get a data rate of 100 Gbps. Regarding the software portion, the Optisystem simulation tool was used for the design and implementation of the system. Moreover, the modulation type used is QAM for the OFDM signal, and I/Q modulation is deployed, while Coherent and Direct detection is used at the receiving portion. Q Factor, the bit error rate and eye diagram were discussed to study the System’s Performance and Quality. This work found CD-OOFDM is the best system for next generation of optical. The work compared WDM CD-OOFDM with SMF-DCF to DD and CD-OOFDM. In addition to that, it compared WDM CD-OOFDM with SMF-DCF to CD-OODFM with SMF. Therefore, the results showed that WDM CD-OOFDM with SMF-DCF achieved 25 Gbps for four channels of the WDM system at 120km channel, where the carrier frequencies were from 193.05THz to 193.2THz.

Spectral efficiency and performance improvement of coherent optical transmission system

“…Unlike those other studies, ours had a longer link of 2760 km at -3.8 dBm launching power with an acceptable BER. [22] 100 Gbps -5 8 1 × 10 −9 576 DP-CO-OFDM-16QAM [23] 100 Gbps -----8 0.57 1000 DP-CO-OFDM-QPSK [24] 20 Gbps -6 4 ≈ 1.7 × 10 −3 1000 DP-CO-OFDM-QPSK [25] 100 Gbps -4 4 ≥ 1 × 10 −5 936 CO-OFDM-16PSK [26] 60 Gbps -------8 1 × 10 −3 250 CO-OFDM-16QAM [27] 40 Gbps -------4 0 150 PDM-CO-OFDM-16QAM [28] 100 Gbps…”

High-speed multi-channel long-haul coherent optical transmission system

“…Compared with SSMF, the G.654.E fiber gives a clearer constellation plot and a broader opened eye diagram, as shown in Figure 10 and Figure 11, respectively. 20 𝜆 × 50 Gbps 50 1 1 × 10 −2 1800 WDM PDM-CO-OFDM-QPSK [25] 16 𝜆 × 100 Gbps 50 2 1 × 10 −3 1440 WDM PDM-CO-OFDM-16QAM [26] 8 𝜆 × 100 Gbps 50 2 1 × 10 −12 480 WDM CO-OFDM-4QAM [27] 4 𝜆 × 10 Gbps 50 0.2 1 × 10 −4 600 WDM CO-OFDM-16QAM [28] 4 𝜆 × 10 Gbps 100 0.1 2.9 × 10 −3 120 WDM CO-OFDM-4QAM [29] 4 𝜆 × 25 Gbps 50 0.5 0 120 DWDM DP-DD-DQPSK [30] 64 𝜆 × 14 Gbps 100 0.…”

Performance Evaluation of Dispersion Compensation Fiber-based Coherent Optical OFDM-WDM for Long Haul RoF

“…In addition, the use of WDM is to increase the bandwidth utilization. As a result, the first goal of this article is to investigate the performance of integrated CO-OFDM with RoF framework for a single user [2]. The second goal is to determine the best form of dispersion compensation fiber (DCF) to compensate for fiber connection losses, and the third goal is to achieve long-haul transmission over a distance up to 6600 kilometers based on pervious system elements described in the first and second goals based on Opti system 14 software.…”