摘要
阵列布拉格光栅(FBG)编解码器是二维混合扩时跳频光码分多址(OCDMA)系统的关键部件。运用高斯切趾光纤布拉格光栅阵列作为光编解码器,抑制了编码波长间的串扰,提高了编解码器的抗干扰能力。分析了二维扩时跳频OCDMA系统的原理及编解码信号模型,并对FBG阵列二维编解码器的时域编解码性能进行仿真研究。给出了编解码器中波长不匹配分析的数学模型,采用解码信号的自相关峰值作为衡量编解码器性能的指标,分析了各种波长不匹配情况下的编解码器性能。理论分析和仿真结果表明,更多的子光栅数具有更强的抗干扰能力,但要以误码率提高、传输速率下降为代价。
Optical en/decoder,based on fiber Bragg grating （FBG） arrays plays as a key role in a 2-demension hybrid time-spreading and wavelength hopping optical code division multiple-access （OCDMA） system. Suppressing the interference between the wavelengths of the encoder is investigated,and the performance of the encoder with the Gaussian apodized FBG is improved. The theory and the model of the encoder/decoder in 2-demension hybrid time-spreading and wavelength hopping OCDMA system are given,and the performance of the FBG encoder/decoder in time domain is analyzed. The mathematic models of the wavelength mismatch in FBG are presented. The auto-correlation peak of the decoding signal is used to quantitatively evaluate the encoder/decoder performance,analyse some kinds of encoder/decoder wavelength mismatch. According to the analysis and simulation,it can be pointed out that large number of son-arrays will improves the system′s capacity for anti-interference,but the biterror rate （BER） performance and data speed will degrade.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2009年第12期3277-3281,共5页
Acta Optica Sinica
基金
江苏省自然科学基金(BK2008437)
江苏省高校自然科学基金(07KJB510066)资助课题
关键词
光纤通信
波长不匹配
高斯切趾光纤光栅
可调谐编解码器
自相关峰值
optical communication
wavelength mismatch
Gaussian-apodized fiber Bragg grating
tunable encoder/ decoder
the auto-correlation peak
