Abstract
Dual polarization quadrature phase shift keying (DP-QPSK) is currently the main modulation format for high-speed optical fiber communications, and its simulation modeling has important implications for theoretical research and practical applications. Based on Optisystem 15 optical communication system simulation software, this paper builds a 100 Gbit/s rate DP-QPSK modulation format coherent optical transmission system simulation model, analyzes the working principles of the transmitting end, transmission link, and coherent receiver. The principle of signal recovery at the digital signal processing end is briefly explained. The simulation results show that the signal quality after DSP processing has been significantly improved.
Highlights
In recent years, with the rapid development of the Internet, user business requirements are constantly changing, data traffic is rising, and new technologies such as big data, cloud computing, large-scale data centers, and the recent rapid development of 5 G are emerging
The coherent detection technology of OTN signals has been the focus of research in the field of optical fiber communications as the core link of OTN signal reception
Jun. 29, 2020 transmission system based on coherent detection has become the industry’s mainstream OTN signal transmission scheme with a transmission rate of 100 Gbit/s, and its research has important theoretical and application value [2]
Summary
With the rapid development of the Internet, user business requirements are constantly changing, data traffic is rising, and new technologies such as big data, cloud computing, large-scale data centers, and the recent rapid development of 5 G are emerging. The coherent detection technology of OTN signals has been the focus of research in the field of optical fiber communications as the core link of OTN signal reception. Where Ex is the light field intensity input in the X polarization direction, β is the transmission constant, L is the electrode length of MZM, and kXI = {0,1}. The transmission equation of the orthogonal shunt after passing through the MZM and through a 90 ̊ phase shifter is: EXQ =. The transmission equation after the combination of in-phase and quadrature shunt is: EQPSK,X = jEX ( jβ L) exp[ jφX (t)]. The transmission equation of the Y polarization direction is: EQPSK,Y = jEY ( jβ L) exp[ jφY (t)]. The DP-QPSK signal transmission equation after the in-phase and quadrature signals are combined in the polarization combiner can be expressed as:
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