Canceling Thermal Cross-Talk Effects in Photonic Integrated Circuits
Canceling Thermal Cross-Talk Effects in Photonic Integrated Circuits
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DOI：
10.1109/jlt.2019.2892512
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发表时间：
2019-02-15
影响因子：
4.7
通讯作者：
Morichetti, Francesco
中科院分区：
文献类型：
--
作者：
Milanizadeh, Maziyar;Aguiar, Douglas;Morichetti, Francesco
热致动器是用于光子集成电路（PIC）的主动控制的最巩固和最广泛的设备之一。作为主要缺点，集成到同一光子芯片上的致动器件之间的相互热串扰会影响PIC的工作点，并且会降低自动调谐和校准过程的效率。本文提出了一种消除热串扰引起的相位耦合影响的方法。在我们的技术中，我们命名为热本征模分解（TED），所有的驱动器的PIC的同时控制根据热耦合系统的本征解。通过数值模拟和马赫-曾德尔干涉仪耦合微谐振器和开关结构的实验验证了TED方法的有效性。关于相位致动器的单独控制，其中热串扰会阻碍自动调谐算法的收敛，利用TED技术，总是达到收敛，需要较少的迭代次数，并且对PIC的初始状态不太敏感。所提出的TED方法可以应用于通用的调谐和锁定算法，可以在任意PIC结构中使用，并且其有效性可以扩展到由其他物理效应引起的相位耦合的系统，例如RF线之间的相互机械应力和电磁耦合。
Thermal actuators are among the most consolidated and widespread devices for the active control of photonic integrated circuits (PICs). As a main drawback, mutual thermal crosstalk among actuated devices integrated onto the same photonic chip can affect the working point of the PIC and can reduce the efficiency of automated tuning and calibration procedures. In this paper, a strategy to cancel out the effects of the phase coupling induced by thermal crosstalk is presented. In our technique, we named thermal eigenmode decomposition (TED), all the actuators of the PIC are controlled simultaneously according to the eigensolution of the thermally coupled system. The effectiveness of the TED method is validated by numerical simulations and experiments carried out on coupled microring resonator and switch fabrics of Mach-Zehnder interferometers. With respect to individual control of phase actuators, where thermal crosstalk can hinder the convergence of automated tuning algorithms, with the TED technique convergence is always reached, requires a lower number of iterations, and is less sensitive to the initial state of the PIC. The proposed TED method can he applied to generic tuning and locking algorithm, can be employed in arbitrary PIC architectures and its validity can be extended to systems where phase coupling is induced by other physical effects, such as mutual mechanical stress and electromagnetic coupling among RF lines.