Compact and phase-error-robust multilayered AWG-based wavelength selective switch driven by a single LCOS.
Compact and phase-error-robust multilayered AWG-based wavelength selective switch driven by a single LCOS.
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DOI：
10.1364/oe.21.017131
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发表时间：
2013-07
期刊：
影响因子：
3.8
通讯作者：
K. Sorimoto;K. Tanizawa;H. Uetsuka;H. Kawashima;M. Mori;T. Hasama;H. Ishikawa;H. Tsuda
中科院分区：
文献类型：
--
作者：
K. Sorimoto;K. Tanizawa;H. Uetsuka;H. Kawashima;M. Mori;T. Hasama;H. Ishikawa;H. Tsuda
提出并制作了一种基于硅基液晶(LCOS)的新型波长选择开关。它采用多层阵列波导光栅(AWG)作为波长复用器/解复用器。LCOS逐个通道地偏转光谱分解的波束，并将它们切换到多层AWG所需的波导层。为了获得高成品率的多层AWG，用LCOS进行额外的相位调制来外部补偿AWG的相位误差。这种附加的相位调制被应用于AWG小面的等效图像，该图像由中继透镜投射。在我们之前报告的WSS配置中，缺点是占用空间较大且成本增加，因为需要两个LCO：一个LCO用于端口间切换操作，另一个用于相位误差补偿。另一方面，在新提出的配置中，切换和补偿操作都使用单个LCOS来执行。这种组件数量的减少是通过引入具有反射器的折叠结构来实现的。WSS光学器件的体积为80×100×60 mm~3，比以前的配置小了大约40%。偏振相关损耗和通道间串扰分别小于1.5dB和-21.0dB。成功地实现了40Gbit/S NRZ-OOK信号的无差错传输。
A novel liquid crystal on silicon (LCOS)-based wavelength selective switch (WSS) is proposed, fabricated, and demonstrated. It employs a multilayered arrayed waveguide grating (AWG) as a wavelength multiplex/demultiplexer. The LCOS deflects spectrally decomposed beams channel by channel and switches them to desired waveguide layers of the multilayered AWG. In order to obtain the multilayered AWG with high yield, phase errors of the AWG is externally compensated for by an additional phase modulation with the LCOS. This additional phase modulation is applied to the equivalent image of the facet of the AWG, which is projected by a relay lens. In our previously-reported WSS configuration, somewhat large footprint and increased cost were the drawbacks, since two LCOSs were required: one LCOS was driven for the inter-port switching operation, and the other was for the phase-error compensation. In the newly proposed configuration, on the other hand, both switching and compensation operations are performed using a single LCOS. This reduction of the component count is realized by introducing the folded configuration with a reflector. The volume of the WSS optics is 80 × 100 × 60 mm3, which is approximately 40% smaller than the previous configuration. The polarization-dependent loss and inter-channel crosstalk are less than 1.5 dB and -21.0 dB, respectively. An error-free transmission of 40-Gbit/s NRZ-OOK signal through the WSS is successfully demonstrated.