Demonstration of Multi-Casting in a 1 × 9 LCOS Wavelength Selective Switch
Demonstration of Multi-Casting in a 1 × 9 LCOS Wavelength Selective Switch
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DOI：
10.1109/jlt.2013.2293919
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发表时间：
2014-02
影响因子：
4.7
通讯作者：
B. Robertson;Haining Yang;M. Redmond;N. Collings;J. Moore;Jinsong Liu;A. Jeziorska-Chapman;
中科院分区：
文献类型：
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作者：
B. Robertson;Haining Yang;M. Redmond;N. Collings;J. Moore;Jinsong Liu;A. Jeziorska-Chapman;
基于硅上液晶(LCOS)空间光调制器技术和变形光学技术的多功能1×9波长选择开关在100 GHz和200 GHz的通道间隔下进行了测试，包括单光束偏转和两个端口多播的动态数据测量。使用改进的Gerchberg-Saxton例程来设计核心全息图，然后使用模拟退火例程来减少非开关端口处的串扰，从而优化多播全息图。研究了在优化过程中钳制相邻像素之间的相位变化幅度的效果，对两个端口多播的实验结果表明，信号插入损耗归一化为单端口偏转的-7.6%，均匀性为±0.6%，最坏情况下的串扰为-19.4dB，这些都可以通过在LCOS SLM盖板上使用更好的减反射涂层等措施来进一步改善。
A multi-functional 1 × 9 wavelength selective switch based on liquid crystal on silicon (LCOS) spatial light modulator technology and anamorphic optics was tested at a channel spacing of 100 and 200 GHz, including dynamic data measurements on both single beam deflection and multi-casting to two ports. The multi-casting holograms were optimized using a modified Gerchberg-Saxton routine to design the core hologram, followed by a simulated annealing routine to reduce crosstalk at non-switched ports. The effect of clamping the magnitude of phase changes between neighboring pixels during optimization was investigated, with experimental results for multi-casting to two ports resulting in a signal insertion loss of -7.6 dB normalized to single port deflection, a uniformity of ±0.6%, and a worst case crosstalk of -19.4 dB, which can all be improved further by using a better anti-reflection coating on the LCOS SLM coverplate and other measures.