Optical steganography of code-shift-keying OCDMA signal based on incoherent light source

Amplitude Shift Keying & Frequency Shift Keying

Aim: To generate and demodulate an amplitude shift keyed (ASK) signal and a binary FSK signal. Amplitude shift keying-ASK-in the context of digital communications is a modulation process, which imparts to a sinusoid two or more discrete amplitude levels. These are related to the number of levels adopted by the digital message. For a binary message sequence there are two levels, one of which is ...

An OCDMA Scheme to Reduce Multiple Access Interference and Enhance Performance for Optical Subscriber Access Networks

Sangjo Park et al. 13 We propose a new optical code division multiple access (OCDMA) scheme for reducing multiple access interference (MAI) and enhancing performance for optical subscriber access networks using modified pseudorandom noise (PN)-coded fiber Bragg gratings with bipolar OCDMA decoders. Through the bipolar OCDMA decoder and the modified PN codes, MAI among users is effectively depre...

Slow light on Gbit/s differential-phase-shift-keying signals.

We demonstrate, via simulation and experiment, slowing down of a phase-modulated optical signal. A 10.7-Gb/s NRZ-DPSK signal can be delayed by as much as 42 ps while still achieving error free via broadband SBS-based slow light. We further analyze the impact of slow-light-induced data-pattern dependence on both constructive and destructive demodulated ports. By detuning the SBS gain profile, we...

RFID Code Wireless Transceiver System Based on Amplitude Shift Keying Modulation

Wireless techniques based applications have rapidly increased due to the dramatic improvement of modern technologies. Many remote monitoring and/or controlling systems are proposed and/or implemented based on different types of wireless communication technologies. Some of the remotely based systems adopt ZigBee communication protocol. Other systems are based on combinations of technologies such...

SOA/SPD-based incoherent SAC-OCDMA system at 9×5Gbps