A conclusion is given that response range of DOP ellipsoid shortest axes to PMD can be greatly increased by using the proper bandwidth filter and selecting proper pulse width laser in RZ code optical fiber communication system.
提出了使用適當(dāng)帶寬的光帶通濾波器和選擇合適的脈沖寬度兩種方法來(lái)增加RZ碼光纖通信系統(tǒng)中偏振度橢球?qū)ζ衲Ｉ⒌捻憫?yīng)范圍,模擬計(jì)算得到了40Gb/s的RZ碼在不同脈沖寬度以及同一脈沖寬度下不同的濾波器帶寬兩種情況下偏振度橢球的短軸隨偏振模色散的變化情況 結(jié)果表明,采用這二種方法可以明顯地提高偏振度橢球的短軸對(duì)偏振模色散的響應(yīng)范圍 另外,數(shù)值模擬結(jié)果還表明對(duì)于40Gb/s的系統(tǒng)濾波器帶寬應(yīng)大于50Hz,光源脈寬應(yīng)在4ps~10ps較為合適 通過(guò)實(shí)驗(yàn)證明了這二種方案是可行的。
By analysing frequency spectrum in this paper,we can understand that when NRZ code be transferred into RZ code of 1/2 mark-to-space ratio,the timing clock can be obtained at largest power.
在光纖數(shù)字通信系統(tǒng)中,NRZ非歸零碼和RZ歸零碼是最常見(jiàn)的基帶信號(hào)。