FPGA controlled microring based tunable add-drop filter

A silicon photonic circuit comprising all the building blocks necessary to demonstrate optical communication between two sockets interconnected through an Arrayed Waveguide Grating Router is reported. The paper focuses on the robustness of the interconnection scheme to the unavoidable wavelength and thermal fluctuations observed in real datacenter environments. To improve the reliability of the system, a feedback control mechanism, based on ContactLess Integrated Photonic Probes and heater actuators, is added to the interconnection to monitor in parallel the working point of each sensitive device and keep it locked in real-time. Experimental results demonstrate successful operations in a 30 Gbit/s data routing scenario at 5 • 10 −11 bit error rate, irrespective of sudden wavelength shifts of up to 200 pm or of iterated thermal variations in a 10°C temperature range, with a recovery time of around 30 ms. These results prove that AWGR-based interconnections equipped with real-time drift compensation systems can be a viable option in multi-socket layouts even in highly demanding environments. Index Terms-Silicon photonics, thermal drift compensation, CLIPP sensor, wavelength division multiplexing, AWGR-based interconnect I. INTRODUCTIONWith the demand for data traffic capacity in intra datacenter applications roughly doubling every year [1], novel techniques must be developed to cope with traffic growth. Two key problems that arise when scaling up capacity are the increased power consumption of the processors and the latency in the communication between them. These problems have driven research interest on novel multi-socket-boards (MSB), that integrate several processor sockets on a single board interconnected with a low latency interface. Schemes as Intel's QPI [2] can offer glue-less interconnection but are limited to

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FPGA controlled microring based tunable add-drop filter

Abstract: Abstract-We demonstrate a microring based add-drop filter controlled by a field programmable gate array (FPGA). Specialized heater design maintains tuning performance of the device under non-optimized applied voltages, thus avoiding complicated control circuitry.

Cited by 2 publications

References 10 publications

WDM Recirculation Buffer-Based Optical Fabric for Scalable Cloud Computing

WDM Recirculation Buffer-Based Optical Fabric for Scalable Cloud Computing

WDM-Based Silicon Photonic Multi-Socket Interconnect Architecture With Automated Wavelength and Thermal Drift Compensation

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