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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。
Optical cross-wavelength division multiplexer can split a group of DWDM optical signal into two groups of odd-even channel output, or vice versa. The key design of the birefringent crystal consists of two waveguides A and B with 45 ° of the optical axis. Incident light signal through the polarization beam splitter and polarization element processing, the formation of o light in the A wave, e light and produce phase difference. In the B-wave plate again broken down and interfere with the formation of odd and even channel light output. A wave plate thickness determines the phase difference in order to determine the output channel spacing. Using two perpendicular or the same wave plates with the same material but different wave plates in a certain thickness instead of the wave plate A can eliminate the temperature drift of the output frequency interval. The design based on birefringent crystals is an effective way to realize commercialized optical cross-wavelength multiplexer.