Investigation of Stimulated Brillouin Scattering Effect on Different Modulation Formats

Majid Moghaddasi,Sitibarirah Ahmad Anas,Shervin Shokri,Mazenradhe Hassan,Saleh Seyedzadeh,Kaveh Shameli

doi:10.19026/rjaset.8.996

Abstract

In this study, the impact of Stimulated Brillouin Scattering (SBS) and effective core area and the Brillouin gain coefficient on On-Off Key (OOK) and phase modulation formats is investigated. In comparison with OOK formats, Return to Zero-Differential Phase Shift Keying (RZ-DPSK) revealed more robustness against the SBS effect with regards to jitter. The generated jitter due to power increment from 0 to 6 dBm was measured. The results show 0.1232, 0.1054, 0.0683 and 0.0544 bit period jitter for NRZ-OOK, RZ-OOK 0.5, NRZ-DPSK and RZ DPSK respectively. Furthermore, it is shown that SBS effect changes the behavior of system with regards to bit rate variation. It is shown that lower bit rate, does not guarantee higher performance. For instance, while the log BER at 2 Gb/sec is -11 for RZ-OOK 0.5, -9 for CSRZ,-10 for NRZ-DPSK and -16 for RZ-DPSK, at 8 Gb/sec they hit a peak with -16, -20, -21 and -36, respectively.

Highlights

Nowadays, applications such as video conferencing and data browsing require more bandwidth
The system works well until P = 2 dBm; after such a point all the On-Off Key (OOK) formats decrease while this degradation continues with power increment until the end
Return to Zero-Differential Phase Shift Keying (RZ-DPSK) yields an excellent stability while its Bit Error Rate (BER) reaches from 10-38 at 2 to 10-36 at 8 dBm

Summary

Introduction

Applications such as video conferencing and data browsing require more bandwidth. The input power needs to be increased. In limiting the transmission length, noise is reported to be as the main cause in the single channel optical communications. For a high input power, main destructive factors are the nonlinear effects including Stimulated Brillion Scattering (SBS) and Self-Phase Modulation (SPM). It needs to be mentioned that SBS has dependency on the optical signal intensity whereby it occurs if the input power exceeds the power threshold. Both the power threshold and the SBS amount depend on some other factors namely the modulation format, the fiber properties as well as the strain and temperature in the environment (Agrawal, 2007)

Methods

Results

Conclusion