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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 37,
  • Issue 16,
  • pp. 3939-3947
  • (2019)

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 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.

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