Design Of 100Gbit/s DP-QPSK Modulation Light Source

With the rapid development of Internet technology,the digital signal business needs and the transmission bandwidth are with the rapid growth.As the main way of global information transmission,the speed and capacity of optical signal transmission network represent the important ability of global information transmission network.In recent years,100Gbit/s optical signals modulated by Dual Polarization Quadrature Phase-Shift Keying(DP-QPSK)have been widely used in the global optical backbone networks,especially long-distance transmission.In order to study the generation process of the modulated optical signal,to explore the method of improving the quality of the optical signal transmitted in the optical signal transmission network,and provide a reference for the future optical signal output.In this paper,the process of optical signal generation in optical network is studied.A DP-QPSK modulated optical signal source with 100Gbit/s on single wave is designed and implemented.An optimized scheme is proposed for the key parameters affecting the performance of the signal source.And a related hardware platform is designed.Specific work in this paper includes:(1)The signal damage of DP-QPSK modulated optical signal during transmission is studied and its transmission margin problem is discussed.In this paper,several important modulation schemes for optical transmission signals are studied,and the low density parity check(LDPC)coding for high-speed optical signals is introduced.The application characteristics of Mach-Zehnder modulator and its modulation distortion are analyzed.(2)Aiming at the possible distortion in the process of optical signal modulation,the quality of optical signal modulation is evaluated by the method of time-resolved error vector magnitudes(EVM).The key factors that affect the quality of optical signal output during the actual modulation process are discussed,and the corresponding adaptive feedback regulation scheme is analyzed and designed.In this paper,the key factors that affect the output quality of the optical signal are discussed,including the driving signal distortion of the Mach-Zehnder modulator and the drift of the modulator bias point.An intelligent compensation algorithm for suppressing modulation distortion of optical signal is produced.(3)According to the stability requirement of 100Gbit/s DP-QPSK modulated optical signal transmitting hardware platform,the stability and the output ripple of power supply on the platform are analyzed.An effective matching scheme of the power network impedance allocated on the platform is proposed.(4)Design and implementation of 100Gbit/s DP-QPSK modulated optical signal transmission hardware platform,including the dynamic control algorithm of the device on the platform,such as the Integrable Tunable Laser Assembly(ITLA),Mach-Zehnder Modulator(MZM)and so on.And the processing flow of the driving signal source converted from the client side information source to the optical signal modulator is given.Through the software simulation and hardware platform test,the designed 100Gbit/s DP-QPSK modulation optical signal transmission hardware platform can meet needs of high speed,long distance optical information transmission application.