5-Gb/s XOR optical gate based on cross-polarization modulation in semiconductor optical amplifiers

Nonlinear polarization rotation induced by ultrashort optical pulses in a semiconductor optical amplifier

“…Examples of optical switches based on this principle are published in [9][10][11][12][13][14], but a rate equation model capable of describing nonlinear polarization dynamics on sub-picosecond timescales is not yet available. In [14] a simple rate-equation model for nonlinear polarization rotation in an SOA is presented.…”

All-optical Digital Processing Through Semiconductor Optical Amplifiers

“…In the implementation we inserted a polarizer in the output path. In this way, by properly adjusting the two polarization controllers (PCs) on the probe input/output path, we further increased the suppression capability of the gate for the case Level2 in Table I, by exploiting the nonlinear polarization rotation (NPR) effect in the saturated amplifier (Soto et al, 2001). By doing so we avoided any residual coherent interference at the standard output coupler, where OUT 1 and OUT 2 are combined, when both the LSB and MSB assume the "1" logical value.…”

Amplifier Noise Based Optical Steganography with Coherent Detection

“…Optical XOR logic, optical chaos encryption and optical interference encryption are different encryption techniques that have previously been studied. Optical XOR uses a fiber component to achieve the XOR function, which encrypts the transmitted signal sequence with the encryption sequence [5][6][7][8][9][10][11]. 20 Gb/s real time encryption has been achieved by optical XOR logic [6].…”