This study addresses the issues of geographical distance and security vulnerability in conventional PONs during broadcast downlink transmission. We experimentally demonstrated that IQ-imbalanced and phase-encrypted 4ASK downlink transmission between two ONU groups, separated by a distance of 10 km, can achieve highly secure point-to-multipoint communication.
A thermal RC-network is presented for compact modelling of self-heating in a Si photonic ring modulator. The model captures the non-linear thermo-optical dynamics at low frequencies (<1 GHz), and accurately reproduces nanosecond-scale variations in optical transmission as observed in experiments.
We investigate the theoretical properties of a novel all-optical switch design consisting of a saturable absorber in an add-drop ring resonator. Using a modified transfer matrix method we demonstrate nonvolatile switching, where the routing persists even after the control signal is deactivated.
Photonic hardware represents a promising alternative to speed-up Neural Network (NN) computations, outperforming electronic counterparts in terms of speed, energy consumption and computing density. In this paper we exploit a Photonic-Aware Neural Network (PANN) architecture with unipolar and bipolar weight implementations, considering ReLU and photonic sigmoid as candidate activation functions to solve a heartbeat sound classification task. Results indicate that increasing the bitwidths during quantization improves the F1-score. The use of bipolar implementation for weight choice demonstrates better performance. ReLU is identified as a better nonlinearity. Finally, a multi-resolution scenario in the bipolar photonic-sigmoid experiment is evaluated, revealing that incorporating multi-resolution does not enhance the model's generalization ability if the bitwidth for the first layer remains fixed. However, the importance of the highest bitwidth at the NN inputs is highlighted.
We introduce the concept of GTE-assisted double-pass MZI and its operation using photon number states, based on quantum-optical formalism. We also theoretically show impressive interferometric fringes for different combinations of N-photon states as circuit inputs.
