水下无线光通信中的时域展宽

Wei, 魏巍 Wei; Zhang, 张晓晖 Xiaohui; Rao, 饶炯辉 Jionghui; Wang, 王文博 Wenbo

doi:10.3788/col201109.030101

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…A significant factor that degrades the performance of a UOWC system is scattering because of the decrease in the received optical power [26][27][28]. In order to estimate its influence at the UOWC performance, the seawater's refractive index should be estimated.…”

Section: Group Velocity Dispersion Estimationmentioning

confidence: 99%

“…stands for the complementary error function. Next, by substituting, the T th value from Equation (27) and using Equations (24) and 25, we conclude that the probability of fade for the UOWC system under consideration, taking into account the GVD and the time jitter effect along with the water's attenuation for longitudinal Gaussian pulse propagation, is given through the following closed form mathematical expression:…”

Section: The Probability Of Fadementioning

confidence: 99%

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Underwater Optical Wireless Communications with Chromatic Dispersion and Time Jitter

et al. 2019

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The obsolete communication systems used in the underwater environment necessitates the development and use of modern telecommunications technologies. One such technology is the optical wireless communications, which can provide very high data rates, almost infinite bandwidth and very high transmission speed for real time fast and secure underwater links. However, the composition and the optical density of seawater hinder the communication between transmitter and receiver, while many significant effects strongly mitigate the underwater optical wireless communication (UOWC) systems’ performance. In this work, the influences of chromatic dispersion and time jitter are investigated. Chromatic dispersion causes the temporal broadening or narrowing of the pulse, while time jitter complicates the detection process at the receiver. Thus, the broadening of the optical pulse due to chromatic dispersion is studied and the influence of the initial chirp is examined. Moreover, the effect of the time jitter is also taken into consideration and for the first time, to the best of our knowledge, a mathematical expression for the probability of fade is extracted, taking into account the influence of both of the above-mentioned effects for a UOWC system. Finally, the appropriate numerical results are presented.

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Section: Group Velocity Dispersion Estimationmentioning

confidence: 99%

Section: The Probability Of Fadementioning

confidence: 99%

Underwater Optical Wireless Communications with Chromatic Dispersion and Time Jitter

et al. 2019

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Analysis of the modulation depth of some femtosecond laser pulses in holographic interferometry

2021

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On the basis of the modulation depth in the interference and holographic processes, we discuss in this paper the quality of holograms generated by some femtosecond laser pulses of two different colors. The modulation depth in terms of the fringe contrast (MDFC ratio) of Higher-order sh-and ch-Gaussian temporal profiles (sh n GTP and ch n GTP) are investigated in detail. It's shown that, when we use two lasers having a very large frequency detuning, the sh n GTP exhibit more precise results than the Gaussian beams for holography. sh n GTP give new areas of frequency detuning to realize the very significant value of the MDFC ratio for obtaining better holograms, which is impossible with Gaussian beams. It also permits flexibility in the variable frequency difference and pulse duration for good quality holograms, and in the case of the ch n GTP, null regions develop and frequency bands are observed favoring the formation of the holograms. The numerical simulations are presented to illustrate and discuss the influence of the frequency detuning, the beam order and the controller parameter of the waves on the modulation depths. The propose theory will be a good basis for the development of some new experiments on the holographic interferometry and it will certainly be very useful for the specialists of the studied femtosecond laser pulses.

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Underwater dynamic distance measurement using a cross-sampling dual-comb

Qian

Bi³

et al. 2022

Optics Communications

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水下无线光通信中的时域展宽

Cited by 8 publications

References 13 publications

Underwater Optical Wireless Communications with Chromatic Dispersion and Time Jitter

Underwater Optical Wireless Communications with Chromatic Dispersion and Time Jitter

Analysis of the modulation depth of some femtosecond laser pulses in holographic interferometry

Underwater dynamic distance measurement using a cross-sampling dual-comb

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