Abstract
We propose a flexible dual-pattern communication system based on the existing intensity modulation and direct detection system, which exploits the wavelength tuning characteristic of the distributed Bragg reflector (DBR) laser. At the transmitter side of the system, the DBR laser is wavelength tuned by the wavelength coding signal and intensity modulated by the radio frequency (RF) signal. At the receiver side, the RF signal is detected directly by photodetector 1, while the wavelength coding signal is recovered by a specific optical filter. The proposed system is theoretically analyzed and verified at the C band experimentally. We successfully obtained clear eye openings for the 10- and 25-Gb/s nonreturn-to zero signal. The waveform graphs of the 10- and 100-kHz wavelength coding signal were also measured. The two transmission patterns did not interfere with each other no matter in the back-to-back or 5 km case.
Highlights
The arrival of the information age has accelerated the growth of Internet data traffic, and the optical communication has been playing an increasingly important role in the long, metro, and short transmission networks
The dual-pattern communication system can be used for the hidden communication, when the wavelength coding signal acts as the secure signal and the radio frequency (RF) signal acts as the public signal
The Mach–Zehnder modulator (MZM) is modulated by the RF signal, which is generated by the pulse pattern generator (PPG)
Summary
The arrival of the information age has accelerated the growth of Internet data traffic, and the optical communication has been playing an increasingly important role in the long, metro, and short transmission networks. The optical hidden communication can use the existing public optical network to realize the transmission of secure signal. The dual-pattern communication system transmits the radio frequency (RF) signal and the wavelength coding signal simultaneously, and the wavelength coding signal can be hidden in the RF signal. The dual-pattern communication system can be used for the hidden communication, when the wavelength coding signal acts as the secure signal and the RF signal acts as the public signal. At the transmitter side of the dual-pattern communication system, the DBR laser is wavelength modulated by the wavelength coding signal while transmitting the RF signal by an external Mach–Zehnder modulator (MZM). When the wavelength coding signal is hidden in IM-DD communication as the secure signal, the wavelength coding signal will not be found unless utilizing a specific optical filter
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