Abstract
In this work we showed the optimization of the spectral response of several optical elements in a silicon-based optical switch. Integrated thermal resistors induced a local heating of the components. The temperature increase, in turn, caused a thermal shift of the optical response of the component. In this manner, we aligned interleavers and micro-ring resonators to the International Telecommunication Union (ITU) channels, by using a stochastic method named Globalized Bounded Nelder-Mead (GBNM) to determine the proper temperatures. The optimization engine relied on the optical feedback from on-chip monitor photodiodes to drive these photonic elements into the wanted functioning condition. This method is suited for restoring the spectral response of optical elements impaired by fabrication inaccuracies. In the same way, it can be applied to tune in resonance active components, whose transfer function has one or more local optima. We proved the reliability of the GBNM method for the optimization of an integrated optical switch, with more than thousand optical components, each one interfaced with a thermal resistor driven by a dedicated electronic circuit. On the one hand, the GBNM guaranteed the automatic alignment of all active components on the chip, over multiple instances. On the other hand, the method allowed for the proper working of such a complex device.
Highlights
The deployment of generation internet multimedia services, mobile internet, and internetTV, calls for an augmented capacity in the optical transport network (OTN) nodes
This method is suited for restoring the spectral response of optical elements impaired by fabrication inaccuracies
We proved the reliability of the Globalized Bounded Nelder-Mead (GBNM) method for the optimization of an integrated optical switch, with more than thousand optical components, each one interfaced with a thermal resistor driven by a dedicated electronic circuit
Summary
The deployment of generation internet multimedia services, mobile internet, and internet. To withstand the ever-increasing data traffic, an all optical switching layer has to be implemented in the OTN nodes, based on scalable, high-capacity, and transparent switching sub-systems, to avoid power hungry optical–electrical–optical conversions [3] This should be combined with a management plane empowering the software defined networking (SDN), to provide high bandwidth connectivity at a relatively low power consumption and low latency [4]. Such an approach requires an optical switch capable of full remote reconfigurability, without the need of any manual intervention, and of an automatic light-path setup with a speed in the sub-millisecond regime, to allow restoration on the fly, in case there is a fault.
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