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Description
This application example underlines the principal limitation of pure time-domain modeling (TDM) of
large-scale photonic integrated circuits (PICs). It is illustrated with a device composed by several cascaded interleavers
(). Using pure TDM, each PIC
element is described by its own FIR filter. Input signals are filtered sample-by-sample by each PIC element. This technique
is quite accurate within a certain bandwidth; however, it is always accompanied by an intrinsic deterioration near the
edges of the simulated signal bands
(). We overcome this problem
with the novel hybrid time-and-frequency modeling domain (TFDM) approach [1] where FIR filters are designed not for each
individual passive PIC element but only for compound passive devices
().
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Typical Results
With the TFDM technique, the accumulation of inaccuracies of FIR filters is dramatically improved.
This implies that a larger time step can be used to achieve similar results, and the simulation time can thus be reduced.
This fact is demonstrated in :
similar performances are achieved for a single interleaver and cascaded structure of 15 interleavers.
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Further Information
Keywords: Interleaver, SMATRIX, Time-and-frequency domain, Photonic Integrated Circuits, PICs
Similar demonstrations are available in VPIComponentMaker Photonic Circuits and on the VPIphotonics Forum.
[1] S. F. Mingaleev, E. Sokolov, C. Arellano, I. Koltchanov, and A. Richter, "Hybrid time-and-frequency-domain approach for modeling photonic integrated circuits", NUSOD, paper ThA4 (2011)
