ECSE Departmental Research Seminars

Speaker: Mr. Thanh Liem HUYNH

Abstract

The optically amplified transmission systems have been progressively developed in the 1990’s and now in the first decade of the 21st century. The transmission distance can now be possible extended to several thousands of km with a transmission bit rate reaching 40 Gb/s or even 160 Gb/s in the near future and narrower channel spacing. Thus, the future optical communication requires effective solutions for combating with the challenging issues of dispersion and nonlinear effects of the optical fibers and requirement of spectral efficiency. These solutions must be both technologically effective and cost-effective. One of the solutions is the dispersion – managed scheme of DWDM system with combined configuration of dispersion compensation (DCF) and optical amplification on the same fibre in which DCF as a lumped/discrete Raman amplifier (DRA) is a potential candidate. The second solution is the focus on the modulation formats of the transmitted signals. DPSK/DQPSK modulation techniques have been investigated as the replacement for On-Off Keying (OOK) format in order to reduce the effective bandwidth and hence minimizing the degradations effects of the transmission fibers. Furthermore, the answer for the question of whether CPFSK and MSK can be a successful candidate modulation technique for advance optical communication transmission systems remain to be investigated and resolved.

In this PhD-conversion presentation, introduction to DWDM systems and degradation factors are briefly addressed. Resolving the challenging issues by the approaches of fibre design for dispersion compensation and optical amplification and advanced modulation techniques give the motivations and objectives of the research study. The current achievements of the thesis project up to this time will be presented with results of fibre design, demonstrations of SIMULINK-platform simulation test-beds and the experimental set-ups of the optically amplified fibre transmission systems. Optical continuous phase frequency shift keying (CPFSK) and its special case minimum shift keying (MSK) are spectrally efficient modulation schemes and promising for future multi-channel networks. The challenging issues and uniqueness of the research remain to be the major contribution to the research study.

Mr. Thanh Liem HUYNH

Course: Research in Master of Engineering Science in the field of Telecommunications

Supervisors: Dr. Le Nguyen Binh

D. Khee Kok Pang

Previous degree: Graduate from RMIT with Bachelor of Engineering (Communication Engineering) degree with 1st Class Honours