Reductions of multiple-access and optical beat interference with fiber-grating OCDMA balanced decoder

Jen-Fa Huang, Yao-Tang Chang, Chuen-Ching Wang
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引用次数: 3

Abstract

An optical spectral coding technique in fiber-grating-based optical code-division multiple-access (OCDMA) system has been investigated in our previous work. In this thesis, the same architecture is set up to investigate the reduction of multiple-access interference caused by the overlapping wavelength from undesired users. Furthermore, the reduction of optical beat interference (OBI) induced by those adjacent grating chips is examined. The reduction of multiple access interference (MAI) and OBI induced by those adjacent grating chips. FBG written as M-sequence and Walsh codes is proposed for such MAI and OBI cancellation in spectrally balanced photo-detectors. Theoretically, M-sequence and Walsh codes are characterized by nearly the same number of "on" chips (i.e., logic "1" chips) and "off" chips (i.e., logic "0" chips). It is seen that the differential decoding scheme characterizes a better performance on eliminating the MAI and OBI problem by mutual cancellation in reflected and transmitted branches of wavelength chips. Furthermore, we propose that the wavelength interleaving allocation method can result in a guard band to suppress OBI. It is shown that SIR has 13 dB improvement with the proposed scheme.
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用光纤光栅OCDMA平衡解码器减少多址和光拍干扰
本文对基于光纤光栅的光码分多址(OCDMA)系统中的光谱编码技术进行了研究。在本文中,我们建立了相同的架构来研究减少由非期望用户的重叠波长引起的多址干扰。此外,还研究了相邻光栅芯片引起的光热干扰(OBI)的减少。减少相邻光栅芯片引起的多址干扰(MAI)和OBI。提出了用m序列和Walsh码编写的FBG,用于谱平衡光电探测器的MAI和OBI对消。理论上,m序列和Walsh码具有几乎相同数量的“on”芯片(即逻辑“1”芯片)和“off”芯片(即逻辑“0”芯片)。可以看出,差分译码方案通过波长芯片的反射和传输分支相互抵消,在消除MAI和OBI问题上具有较好的性能。此外,我们提出了波长交错分配方法可以产生一个保护带来抑制OBI。结果表明,该方案可使SIR性能提高13 dB。
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