2 . because lightwave systems commonly use fibers with randomly varying birefringence, it is important to study how optical pulses are affected by random birefringence changes 二、由于在一般光通信系統(tǒng)中,所采用的光纖的雙折射都是隨機(jī)變化的,因此研究光脈沖如何受光纖隨機(jī)雙折射變化的影響就變得十分重要。