Automatic Monitor-Based Tuning of an RF Silicon Photonic 1X4 Asymmetric Binary Tree True-Time-Delay Beamforming Network
Automatic Monitor-Based Tuning of an RF Silicon Photonic 1X4 Asymmetric Binary Tree True-Time-Delay Beamforming Network
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DOI：
10.1109/jlt.2018.2873199
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发表时间：
2018-11-15
影响因子：
4.7
通讯作者：
Entesari, Kamran
中科院分区：
文献类型：
--
作者：
Choo, Gihoon;Madsen, Christi K.;Entesari, Kamran
光子波束形成网络是未来蜂窝通信系统中实现功率有效传输的有希望的候选者。然而，由于对工艺和温度变化的敏感性，需要自动校准解决方案来实现稳健的操作。本文介绍了一种基于集成光环形谐振器的1X 4非对称二叉树光波束形成网络（OBFN）的全自动监控调谐。所提出的基于监视器的调谐算法通过使用来自电监视器的信息单独控制微加热器来补偿制造变化和热串扰。该算法在OBFN上进行了演示，该OBFN工作在30 GHz，带宽为2 GHz，并在标准的硅光子铸造工艺中制造。实现了在线性波束成形天线阵列中从严重退化的初始响应到目标辐射角超过60度（-30度至30度）所需的明确定义的群延迟响应的OBFN的成功校准。这种全自动调谐方法开启了在真实的宽带毫米波无线通信系统中采用硅OBFN的可能性。
Photonic beamforming networks are promising candidates to achieve power-efficient transmission in future cellular communication systems. However, sensitivity to process and temperature variations necessitates an automatic calibration solution to enable robust operation. This paper demonstrates fully auto-matic monitor-based tuning of an integrated optical ring resonator-based 1X4 asymmetric binary tree optical beamforming network (OBFN). The proposed monitor-based tuning algorithm compensates fabrication variations and thermal crosstalk by controlling micro-heaters individually using information from electrical monitors. This algorithm is demonstrated on an OBFN that operates at 30 GHz with 2 GHz bandwidth and is fabricated in a standard silicon photonics foundry process. Successful calibration of the OBFN from a severely degraded initial response to the well-defined group delay responses required for a targeted radiating angle over 60 degrees (-30 degrees to 30 degrees) in a linear beamforming antenna array is achieved. This fully automatic tuning approach opens the possibility of employing silicon OBFNs in real wideband mm-wave wireless communication systems.