Fig. 2: Lossless PIP system with a SiN chip core.
From: I/O-efficient iterative matrix inversion with photonic integrated circuits
a Experimental set-up of the lossless PIP system. CW Continuous wave laser. Mod Modulator. EDFA Erbium-doped fibre amplifier. BPF Bandpass filter. 1 × 2: 1–by–2 splitter. PC Polarisation controller. PD Photodetector. TIA Transimpedance amplifier. OSC Oscilloscope. PMF Polarisation maintaining fibre. SMF Single-mode fibre. SiN Silicon Nitride. The red and black arrows indicate the signal flows. b Enlarged view of two adders comprising two stages of cascaded 2\(\times\)1 multimode interferometers (MMIs). c Enlarged view of a splitter consisting of two stages of cascaded 1\(\times\)2 MMIs. d Enlarged view of a weight unit comprising of a 1\(\times\)1 thermo-optic (TO) MZI. The blue arrows in (b–d) indicate the signal flows.
