速率超限条件下的光码分多址实验研究

Research on Optical Code-division Multiple Access Technology with Bragg Grating Arrasy

在2个发送用户和1个接收用户的条件下,利用光纤布拉格光栅(FBG)阵列对每个用户在波长和时间上进行二维编解码,对传输速率在20Mb/s～1.4Gb/s以及其内的不同比特率归零伪随机码的二维编解码光码分多址(OCDMA)通信系统及其经过25km光纤传输后的情况进行了实验研究。研究表明,当系统用户数较少时,系统的传输速率超出理论公式的限制后,对系统的性能影响很小。因此,对于用户数很少的OCDMA系统,可以适当增加系统的传输速率,更加充分地利用系统的资源。

A two-dimension encoder/decode optical code-division multiple access(OCDMA) system with fiber Bragg grating(FBG) arrays was developd.The system which has two send users and one receive user and is encoded in wavelength and time is experimentally studied by different bit rate from 20 Mb/s to 1.4 Gb/s RZ pseudo random sequence,and after 25 km optical fiber transmission is also experimentally.The experimental results and theoretic analyses both show that when the system date rate is beyond the theoretic limit,the impact to the system performance is very trivial while there is few users.So the system date rate can be improved when the user number is few.