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提出了一种基于SiO_2平板波导技术,由两端口的定向耦合器、移相器和光延时线构成的全光离散傅里叶变换器(ODFT)。研究了该器件的原理,设计和优化了一个4×40 Gb/s的全光傅里叶变换芯片,并且给出了器件的设计细节和实现方法。在此基础上又设计了一个4×40 Gb/s的全光正交频分复用(OFDM)系统,消除了系统中的电子瓶颈。用VPItransmissionMaker(VPI)对该系统进行了仿真,并与采用幅度调制和差分相位调制方式的系统进行了对比。结果表明,基于全光傅里叶变换器的全光正交频分复用系统性能优越,经过320 km的传输后,误码率(BER)小于3×10~(-11)。全光正交频分复用是一种有潜力的高速长途传输技术。
An all-optical Discrete Fourier Transform (ODFT) based on SiO 2 slab waveguide technology is proposed, which is composed of two-port directional coupler, phase shifter and optical delay line. The principle of the device is studied, a 4 × 40 Gb / s all-optical Fourier transform chip is designed and optimized, and the design details and implementation methods of the device are given. On this basis, a 4 × 40 Gb / s all-optical orthogonal frequency division multiplexing (OFDM) system is designed, eliminating the electronic bottleneck in the system. The system was simulated with VPItransmissionMaker (VPI) and compared with a system using amplitude modulation and differential phase modulation. The results show that all-optical Orthogonal Frequency Division Multiplexing (FOS) system based on all-optical Fourier transformer has superior performance. The bit error rate (BER) is less than 3 × 10 ~ (-11) after 320 km transmission. All optical orthogonal frequency division multiplexing is a potential high-speed long-haul transmission technology.