【作者】 吴迪； 周建华； 严新民；

【Author】 WU Di, ZHOU Jian-hua, YAN Xin-min(Advanced Technology Research Centre, Shenzhen University, ShenZhen 518060, China)

【机构】 深圳大学新技术研究中心；

【摘要】 环境温度的变化将导致光纤光栅中心反射波长的漂移,使多波长OCDMA编码器与解码器的波长失配,从而导致接收端的自相关功率下降。在考虑多用户干扰的情况下,从理论上分析了温度变化对多波长OCDMA系统频谱效率的影响。通过改变判决门限可以大大降低系统误码率,从而改善多波长OCDMA系统的频谱效率。结果表明.对于环境温度变化不大于10℃的接入网或局域网来说,温度变化对MW OCDMA频谱效率的影响不大。更多还原

【Abstract】 The central reflecting wavelength of FBG would vary with environment temperature, which would cause wavelength mismatch between optical encoder and decoder, and would decrease the autocorrelation power. Under considering the multi-access interference, the effect of wavelength mismatch on the spectral efficiency of multi-wavelength optical code-division multiple-access(MW OCDMA) system was analyzed. Through changing the judge threshold, BER of MW OCDMA system could be decreased greatly, and spectral efficiency of MW OCDMA system was improved. Analysis results show that spectral efficiency of MW OCDMA is little degraded by less than 10℃ temperature variation in LAN or access network.更多还原