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Wang G Q, Min R, Li X Q, et al. Dual channel encrypted free-space optical communication system[J]. Opto-Electron Eng, 2024, 51(9): 240106. doi: 10.12086/oee.2024.240106
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Dual channel encrypted free-space optical communication system
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Abstract
A dual channel encrypted free-space optical communication system based on compressive sensing and tilted fiber grating is proposed. This approach not only greatly reduces the data acquisition volume, but also enhances the security of the system since the data transmitted in the free-space is encrypted. Besides, our proposal adopts low-bandwidth and low-cost photodetectors and analog-to-digital convertors, decreasing the data acquisition volume and the cost of data transmission. Also, the approach utilizes the tilted fiber grating with a 45° tilted angle as the free-space light emitter, free-space light lateral diffraction device, and polarization-sensitive device, simultaneously. The utilization of 45° tilted fiber grating greatly enhances the systematic integration, reduces the volume of the system and improves the energy efficiency of the system. A demonstration shows that two 1 GHz and 3 GHz sinusoidal signals are employed for the 3.9 m free-space data transmission with data compression ratios of 16% and 8% achieved both in the time domain and frequency domain. -
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References
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Overview
To achieve a data-efficient and high-efficiency free-space optical communication system, a dual channel encrypted free-space optical communication system based on compressive sensing and 45° tilted fiber grating is proposed. The utilization of compressive sensing not only greatly reduces the data acquisition volume, and mitigates the big data problem in the high throughput transmission system, but also enhances the security of the system thanks to the data transmitted in the free-space being encrypted. Besides, the application of compressive sensing also allows the employment of low-bandwidth and low-cost photodetectors and analog-to-digital converters in the high-speed optical communication system, which decreases the data acquisition volume and the cost of data transmission. What’s more, the 45° tilted fiber grating has the benefits of high-efficiency, high stability, compactness, and low insert loss thanks to its feature of compatibility with fiber links. In the proposed optical communication system, the 45° tilted fiber grating acts as the key role of (a) lateral light emitter thanks to its special radiative structure, which allows incident light to radiate from the fiber core into free-space via the fiber cladding, (b) high efficient in-fiber polarizer due to its polarization-sensitive feature and thus obtaining polarization control, and (c) high-efficiency in-fiber diffraction grating resulting from its wavelength-dependent lateral diffraction characteristic, which realizes a point-to-point privacy channel for secure data transmission. The employment of 45° tilted fiber grating drastically augments the stability, efficiency, and integration of the system, and decreases the volume of the system. A demonstration of a 3.9 m dual channel encrypted free-space optical communication system is performed using an original sinusoidal RF signal with a frequency of 1 GHz and 3 GHz. A PD with a bandwidth of 1 GHz is utilized to detect the final received signal. The two optical carriers with wavelengths of 1540 nm and 1550 nm are employed to act as the remote two users. In the proposed system, the experimental results give the compression ratios of 16% and 8%, respectively. Also, the reconstructed RF signals and the original RF signal show good consistency whether in the spectral domain or in the temporal domain in varied wavelength carriers and varied compression ratios. Besides, a random RF signal with varied frequency components is utilized for free-space optical communication and data compression ratios of 30%, 20%, and 10% are obtained in the temporal domain. The reconstructed dual channel RF signals and random RF signals and their original RF signals have good consistency both in the temporal domain and the spectral domain. The employment of compressive sensing and 45° tilted fiber grating in the proposed system paves the way for overcoming the data efficiency, energy efficiency and compact issues in the traditional optical communication system. The proposal has the benefits of being compact, stable, secure, efficient, and data-efficient, which is particularly promising in underwater and secured indoor data communication.
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Wang G Q, Min R, Li X Q, et al. Dual channel encrypted free-space optical communication system[J]. Opto-Electron Eng, 2024, 51(9): 240106. doi: 10.12086/oee.2024.240106
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Figure 1.
Principle of a 45° TFG. (a) Structure of lateral diffraction from the 45° TFG; (b) Divergent output characteristics in radial plane
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Figure 2.
Schematic of the proposed dual channel encrypted FSO communication system
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Figure 3.
Spectrum of the optical carrier. (a) 1540 nm; (b) 1550 nm
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Figure 4.
Temporal waveform of the optical signal. (a) Point A; (b) Point B
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Figure 5.
The original RF signals (blue lines) and their reconstruction results with data compression ratios of 16% (red lines) and 8% (green lines) in the 1540 nm temporal domain (a), and the 1540 nm spectral domain (b), and 1550 nm temporal domain (c), and 1550 nm spectral domain (d)
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Figure 6.
The input RF signal (a) and its reconstruction results with data compression ratios of 30% (b), 20% (c), and 10% (d) in the temporal domain
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