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通过对基于傅里叶变换过程的全光OFDM(正交频分复用)进行理论模型分析,采用马赫-曾德干涉仪级联的方式构造出复用/解复用模块,在光域上直接进行IDFT/DFT(离散型傅里叶逆变换/离散型傅里叶变换)过程。在DPSK(差分相移键控)调制、DQPSK(差分四相相移键控)调制、4QAM(2阶正交幅度调制)和16QAM(4阶正交幅度调制)下,利用全光复用/解复用模块模拟了8×40Gbit/s无保护间隔的OFDM系统传输,对误码率等性能作出分析。
Through theoretical analysis of all-optical OFDM (Orthogonal Frequency Division Multiplexing) based on the Fourier transform process, a multiplexing / demultiplexing module is constructed by using a Mach-Zehnder interferometer cascade, and on the optical domain The IDFT / DFT (Discrete Fourier Transform / Discrete Fourier Transform) process is performed directly. In the case of DPSK (Differential Phase Shift Keying) modulation, DQPSK (Differential Quadrature Phase Shift Keying) modulation, 4QAM (2nd order Quadrature Amplitude Modulation) and 16QAM (4th order Quadrature Amplitude Modulation) The multiplexing module simulates the 8 × 40Gbit / s unprotected OFDM system transmission, the performance of the bit error rate analysis.