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Up-to-date network telemetry is the key enabler for resource optimization bya variety of means including capacity scaling, fault recovery, networkreconfiguration. Reliable optical performance monitoring in general andspecifically the monitoring of the spectral profile of WDM signals in fixed-and flex-grid architecture across the entire C-band remains challenging. Thisarticle describes a spectrometer circuit architecture along with an originaldata processing algorithm that combined can measure the spectrum quantitativelyacross the entire C-band aiming at 1 GHz resolution bandwidth. The circuit iscomposed of a scanning ring resonator followed by a parallel arrangement ofAWGs with interlaced channel spectra. The comb of ring resonances provides thehigh resolution and the algorithm creates a virtual tuneable AWG that isolatesindividual resonances of the comb within the flat pass-band of its synthesizedchannels. The parallel arrangement of AWGs may be replaced by a timemultiplexed multi-input port AWG. The feasibility of a ring resonatorfunctioning over whole C-band is experimentally validated. Full tuning of thecomb of resonances over a free spectral range is achieved with ahigh-resolution bandwidth of 1.30 GHz. Due to its maturity and low loss, CMOScompatible silicon nitride is chosen for integration. Additionally, the wholesystem demonstration is presented using industry standard simulation tool. Thearchitecture is robust to fabrication process variations owing to its dataprocessing approach.

Circuit design and integration feasibility of a high-resolution broadband on-chip spectral monitor