基于线性组合码的多速率光码分多址接入系统  

Experiment Research of Multi-Rate Optical Code Division Multiple Access System Based on Linearly Combinated Code

作　　者：张琦[1] 余重秀[1] 徐大雄[1] 忻向军[1] 王守源[1] 桑新柱[1] 

机构地区：[1]北京邮电大学电子工程学院,北京100876

出　　处：《中国激光》2006年第5期626-630,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(60577045)资助项目

摘　　要：线性组合码(LCC)具有码族容量大、误码率(BER)低等优点,是实现光码分多址(OCDMA)的一种有效手段。通过改变组成线性组合码的子码字数可以实现多速率传输。利用基于线性组合码的二维时域/频域光纤光栅编/解码器,建立了多速率随机接入实验平台,成功实现了双用户发送和双用户接收的双速率光码分多址数据通信。线性组合码选用素数跳频码(PC)为子码族,实验中取素数为3的素数码控制时间扩频和波长跳频。实验验证了线性组合码多速率光码分多址接入系统方案的可行性。Linearly combinated code （LCC） possesses the feature of large capacity, low bit error rate （BER）. It is an effective way to realize the optical code division multiple access （OCDMA）, Multi-bit rate transmission can be carried out by changing the number of sub-codewords in a LCC. Multi bite rate random access experiment is set up by employing two-dimension time/wavelength domain fiber grating encoder and decoder based on the linearly combinated code. The sub-codewords of linearly combinated code come from prime code （PC）/PC set. In the experiment, spreading frequence of time domain and wavelength hopping are controlled by prime code with prime 3. The transmitting and receiving experiments for two users in every end are successfully executed. The feasibility of multi-bit rate optical code division multiple access system is experimentally demonstrated.

关 键 词：光通信 光码分多址 线性组合码 时域/频域编解码 光纤布拉格光栅 

分 类 号：TN929.11[电子电信—通信与信息系统]