Fig. 2: Proposed integrated silicon photonic crossbar-based hamming distance processing unit. | Nature Communications

Fig. 2: Proposed integrated silicon photonic crossbar-based hamming distance processing unit.

From: Nonlinear optical vector processing using linear silicon photonic circuits for 50 Gb/s memory and string similarity functions

Fig. 2

a Microscope photo of the integrated 4 × 4 crossbar prototype comparison unit. Inset: Single crossbar comparison cell, consisting of two EAMs and two TO PSs. The search vector encoding unit and the 4 × 4 crossbar, are marked with yellow and orange rectangles, respectively. b Experimental testbed for the HD comparison operation at 20 and 50 Gb/s, highlighting the search vector encoding unit (yellow) and the 4 × 4 crossbar-based HD processor (orange), along with the respective comparison cells (brown). A DC control plane is employed for biasing the static EAMs and PSs located in the crossbar layout. EAM electro-absorption modulator, TO thermo-optic, PS phase-shifter, HD hamming distance.

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