A Comprehensive Comparison and Analysis of Several Intensity Modulations Based on the Underwater Photon-Counting Communication System

Han, Xiaotian; Li, Peng; Chang, Chang; Gao, Duorui; Zhang, Dongquan; Liao, Peixuan; Wang, Wei; Xie, Xiaoping

doi:10.3389/fphy.2021.815343

Cited by 4 publications

(3 citation statements)

References 42 publications

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“…While there have been tremendous strides in the past few years in realizing high data rate underwater optical channels, the experimental conditions vary widely across data encoding schemes, optical powers, wavelengths, seawater types, distances, and transmit-receive beam configurations. Only a few reports (e.g., refs and ) have tackled informational capacities or BER as a function of distance in a systematic way, for a specific attenuation, wavelength, encoding scheme, etc. This situation makes it difficult, from a design perspective, to engineer an optimum solution for a given distance, seawater type, channel capacity, and wavelength.…”

Section: Channel Capacitymentioning

confidence: 99%

Shannon–Hartley Channel Capacity for Underwater Wireless Optical Communications

De Freitas

2024

ACS Photonics

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Although the Shannon–Hartley theorem is used to give insights into the upper limits of channel capacity for unguided underwater communications, experimental efforts to date show little or no clear validation of these models. A perspective on the bit-rate capacity for additive white Gaussian noise and intensity modulated direct detection underwater optical communication systems is presented by using engineering model functions. While the focus is on narrow optical Gaussian beams, as might be anticipated for artificially intelligent swarming autonomous underwater vehicles, the model is equally valid for broad transmission cone beams under certain relaxed parameter conditions. The emerging perspective here is for a concerted effort to validate these models in a standard way. This approach will provide practical bounds for underwater wireless optical communication systems making the development effort more productive, focused, and efficient.

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Section: Channel Capacitymentioning

confidence: 99%

Shannon–Hartley Channel Capacity for Underwater Wireless Optical Communications

De Freitas

2024

ACS Photonics

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“…In the same year [44] , the Shanghai Institute of Technology and Physics achieved a communication sensitivity of 1.35 photos/bit using photon counting reception technology. In 2022 [45] , the Xi'an Institute of Optics and Mechanics analyzed and compared the communication performance of various intensity modulations based on photon counting communication systems. In the area of underwater coherent optical communication research, in 2021 [46] , a simplified detection method for underwater coherent optical wireless communication (UCOWC) has been proposed by the Pengcheng laboratory, using BPSK, QPSK, and 8PSK modulation signals to provide data rates of 500 Mbps, 1 Gbps and 1.5 Gbps respectively.…”

Section: Underwater High-sensitivity Optical Signal Processing Techni...mentioning

confidence: 99%

The research progress in underwater wireless optical communication technology

Han¹,

Nie²,

Chang³

et al. 2023

First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023)

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Underwater wireless optical communication, which is an effective technical way to build a high-speed and flexible underwater wireless communication network due to its large bandwidth, good confidentiality and low time delay, is widely regarded as a complementary communication way to hydroacoustic communication. The newest research progress and main technical specification in the current technology of underwater wireless optical communication are introduced, the characteristics of the current underwater wireless optical communication technology are summarized in this paper. A series of improvement measures are proposed for the problems of short communication distance and low robustness in underwater wireless optical communication system, which can provide references for underwater wireless optical communication technology research and engineering project development.

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“…Under the diverse modulation method, the proven techniques of FSOC are mainly divided into two main categories: non-coherent and coherent communication systems. Intensity modulation and direct detection (IM-DD) are utilized in non-coherent systems, which have the advantages of simplicity of structure and high reliability (although with undesirable levels of reception sensitivity) [12]. By contrast, coherent communication systems, which combine phase modulation with coherent detection, deploy the coherent superposition of local-oscillator (LO) and signal optical fields, supporting high sensitivity, high modulation rates, and strong anti-interference capability [13,14].…”

Section: Introductionmentioning

confidence: 99%

High-sensitivity multi-channel DPSK system with real-time phase lock controller for free-space optical communication

Gao

Xie

et al. 2022

Front. Phys.

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To overcome the power jitters in satellite-to-ground communications caused by atmospheric turbulence, a type of DPSK free-space communication system, assisted by a self-designed real-time phase lock controller, has been established. The system can effectively compensate for power swings in communication links and hence achieve high sensitivity. The wavelength division multiplexing technique is applied to a four-channel DPSK system to provide greater link capacity. With the data rate of a single channel as 2.5 Gbps and unencoded BER as 1 × 10–3, reception sensitivity has been obtained at −53.58 dBm (13.69 photons/bit), −53.59 dBm (13.66 photons/bit), −53.61 dBm (13.59 photons/bit), and −53.63 dBm (13.53 photons/bit) for each independent channel, respectively. The gap between our sensitivity result and the theoretical limit has narrowed to about −3.5 dB. Simultaneously, the DPSK receiver, with our self-designed phase lock controller, has stabilized reception of optical power fluctuations that range from 0 to 40 dB. Additionally, the impact of a four-wave mixing effect on multi-channel system performance has been investigated in detail. Our experimental results present a novel solution for the superior performance of free-space communication links.

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A Comprehensive Comparison and Analysis of Several Intensity Modulations Based on the Underwater Photon-Counting Communication System

Cited by 4 publications

References 42 publications

Shannon–Hartley Channel Capacity for Underwater Wireless Optical Communications

Shannon–Hartley Channel Capacity for Underwater Wireless Optical Communications

The research progress in underwater wireless optical communication technology

High-sensitivity multi-channel DPSK system with real-time phase lock controller for free-space optical communication

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