摘要
光交叉波分复用器能够把一组DWDM光信号分解成两组奇偶信道输出 ,或反之。双折射晶体的设计关健部分由两个光轴成 45°的波片A和B组成。入射光信号经过偏振分束器和偏振元件处理后 ,在A波片中形成o光、e光并产生位相差。在B波片中再次分解并发生干涉形成奇偶信道光输出。A波片厚度决定位相差从而决定输出信道间隔。用两片光轴垂直或相同但不同材料的波片按一定的厚度组合代替波片A可消除输出频率间隔的温度漂移。基于双折射晶体的设计是实现商用化光交叉波分复用器的有效途径。
Interleaver routes a single set of input DWDM signals into odd and even channels output signals, or in reverse The key part of birefringent crystal interleaver consists of waveplate A and B ,Their optical axes have a 45 degree angle After the input signal light beam passes the polarization beam displacer and polarization rotating parts, it's divided into o beam and e beam in waveplate A , and they form a phase difference when pass A Then in B crystal they are divided into o beam and e beam respectively again and interfere to form odd and even channel output signals Thickness of waveplate A decides the phase difference and then decides the output channel spacing The thermal drift of output channel spacing can be eliminated when waveplate A is replaced by two different materials waveplates which have perpendicular or parallel optical axes and proper thickness Birefringent crystal design is one effective technical approach of actual interleaver
出处
《光学技术》
CAS
CSCD
2001年第5期455-458,共4页
Optical Technique
