利用太赫兹非对称解复用器(TOAD)对伪随机比特序列(PRBS)归零(RZ)码占空比压缩后经多路延迟叠加来实现速率倍增.实验上将周期为2^{7<0sup>-1、速率为2.5 Gb/s的伪随机RZ码占空比由50%压缩至12.5%后经4路精确延时叠加,保持码型不变,速率提升4倍至10 Gb/s,相对于原伪随机码,保证误码率10-9的功率代价为2 dB.}

A scheme for all-optical repetition rate multiplication of return to zero(RZ) pseudorandom bit sequences(PRBS)is demonstrated with a duty ratio compressor based on terahertz optical asymmetrical demultiplexer(TOAD) cascaded multichannel delay structure．Its feasibility is verified by experiments,which shows that the duty ratio of PRBS is compressed from 50% to 12.5% and than the bit rate is promoted from 2.5 Gb/s to 10 Gb/s with a same code type by the four-channel precise delay．The power penalty for bit error rateless than 10^-9 of the eventual PRBS is 2 dB compared to the original PRBS.