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A Novel All-optical OFDM Transmission System and Devices

Author: WangKai
Tutor: LiWei
School: Huazhong University of Science and Technology
Course: Physical Electronics
Keywords: all-optical orthogonal frequency division multiplexing (OFDM) optical transmission system optical discrete Fourier transform (DFT) devices optical coupler planar lightwave circuit (PLC)
CLC: TN919.3
Type: Master's thesis
Year: 2009
Downloads: 90
Quote: 2
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Abstract


This thesis proposes a novel all-optical Orthogonal Frequency Division Multiplexing （OFDM） transmission system, and studies optical Discrete Fourier Transform （DFT） devices based on optical couplers in this system.OFDM has been established as a mature technology for applications of wireless and copper, while it is lately applied to optical communication. But optical transmission by OFDM is the fastest growing area in recent years. In not-all-optical OFDM system, the capacity is limited by two major components: the optical data modulator and the photodiode, and electronics for FFT. While in all-optical one, the FFT process is achieved in optical domain, the OFDM transmission data rate can be increased by far. All-optical OFDM becomes an attractive candidate for high capacity, frequency effective, long haul communication systems.This thesis firstly analyses the mathematical principle of OFDM, and discusses key technologies related to basic functions of wireless OFDM system.Then, this thesis applies a kind of optical DFT devices based on optical couplers in accordance with all-optical OFDM system. And shows that one coupler can act as a 2×2 DFT device when combined with appropriate phase shift, owing to the relationship between its inputs and outputs. Taking it as the basic unit, a N×N DFT device is constructed according to FFT algorithm. We also show the detailed structure and simulation of DFT devices based on Planar Lightwave Circuit （PLC）.Next, this thesis proposes a novel all-optical OFDM system based on the devices mentioned above. The function of each section and operation processes of system are illustrated. A simulation of this all-optical OFDM system at 160Gbit/s is conducted. The results give BER of 7.958×10-10 and OSNR of 24.97dB both at receiver. Also performance simulations are implemented, which consist of dispersion character and noise characteristics of different modulation and nonlinear effect in all-optical OFDM system. The feasibility of the system is demonstrated.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Data communication > Data transmission technology
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