Automatic Tuning of Silicon Photonics Microring Filter Array for Hitless Reconfigurable Add–Drop

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Abstract
Given the escalation of demand for high speed data interconnection, both between users and datacenters, high capacity optical networks need a boost in capacity, flexibility and efficiency. To stand up for those problems, the network reconfigurability is a key feature in a saturated and power hungry network operating scenario. In this paper, a reconfigurable optical node, using a commercial integrated photonics foundry was conceived, fabricated and tested. A novel application of automatic control of complex optical circuits involving locking and tuning of microring resonators is presented. The technique exploits a channel labeling strategy to identify a single optical channel amid a Dense Wavelength Division Multiplexing (DWDM) comb. The fabricated filter array provided add-drop ports with hitless channel reconfiguration and telecom graded specifications as 20 dB of in-band isolation, 40 GHz of channel bandwidth in a microring filter with 1 THz of Free Spectral Range (FSR).
Funding Information
  • European Commission (688172)

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