基于多载波技术的光网络研究

urrently, orthogonal frequency division multiplexing has been widely regarded as one of the most promising technology in next-generation optical access network. When conventional orthogonal frequency division multiplexing is applied to the optical network, after the operation of inverse fast Fourier transform, the actual outputs are two parts: the real and imaginary part of the signal. So we should need two D/A converters. And the two parts of signal should be added after the quadrature modulation, which brings a higher requirement for optical modulator. In this paper, a novel method of the application of multi-carrier technology in optical network is proposed. After the inverse fast Fourier transform, there is only one output. Therefore it reduces the complexity of the system. This paper exhibits the performance of the novel method based on system simulation. The results show that the complex two-dimensional modulation can be replaced by the simple one-dimensional modulation in this novel method. And it has smaller sensitivity to the laser phase noise.