Abstract
The high security of optical phased array (OPA) signals is an important requirement for OPA-based optical wireless communication (OWC). We propose a method for improving the security of OPA-based OWC systems using optically injection-locked (OIL) semiconductor lasers. We theoretically demonstrate the amplitude and phase modulation of OIL-OPA elements by controlling the injection-locking parameters of the OIL lasers. When a Taylor window function is applied as the amplitude profile of the OPA transmitter, the sidelobe level decreases by 22 dB and the unsecured distance reduces 10 times compared to the case without the Taylor window function. In addition, the unsecured area factor becomes 0.8%.
Highlights
Semiconductor laser diodes play a significant role as optical wireless communication (OWC) transmitters, owing to their highly directional beam property, which results in a reduction in beam interference between diverging signals and a reduction in the unsecured distance [1,3,7,8,9]
Achieving a low sidelobe level (SLL) is a critical issue for ensuring the high security and power efficiency of optical phased array (OPA)-based OWC systems
We evaluate the security of the OWC system by considering a “passive” attack, which is attacked if the bit error rate (BER) measured by PDs at the attack positions is ≤ 10−12
Summary
Optical wireless communication (OWC) in the optical wavelength range is an emerging technology in the field of wireless communication. The efficient, simple, and precise control of the phase and amplitude of array elements is critical for achieving high-performance OPA-based OWC. The key performance indicators of the array elements that comprise OWC transmitters in OPA-based OWC systems are output power, steering angle, beamwidth, and sidelobe level (SLL). Achieving a low SLL is a critical issue for ensuring the high security and power efficiency of OPA-based OWC systems. We demonstrate an OPA-based OWC system that uses optically injectionlocked (OIL) semiconductor lasers to achieve low SLL, high security, and frequency stability. Simultaneous optical amplitude modulation (AM) and phase modulation (PM) are achieved in addition to frequency stability by controlling injection-locking parameters without any external element. The OPA-based OWC system using OIL lasers provides a compact transmitter, modulation control, low power consumption, and improved security performance. OIL lasers exhibits improved security performance, and it can be widely applied in fidelity fields such as military and medical applications
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