An efficient rate-adaptive transmission technique using shortened pulses for atmospheric optical communications

Abstract

In free space optical (FSO) communication, atmospheric turbulence causes fluctuation in both intensity and phase of the received light signal what may seriously impair the link performance. Additionally, turbulent inhomogeneities may produce optical pulse spreading. In this paper, a simple rate adaptive transmission technique based on the use of variable silence periods and on-off keying (OOK) formats with memory is presented. This technique was previously proposed in indoor unguided optical links by the authors with very good performance. Such transmission scheme is now extensively analyzed in terms of burst error rate, and shown in this paper as an excellent alternative compared with the classical scheme based on repetition coding and pulse-position modulation (PPM), presenting a greater robustness to adverse conditions of turbulence.

Advantages of solitonic shape pulses for full-optical wireless communication links

“…To show the superiority of the proposed pulse, we analyze the performance of rectangular, Gaussian and solitonic pulses shapes in terms of the peak-to-average optical power ratio (PAOPR) and bit error rate (BER). Note that the PAOPR is a favorable characteristic in intensity-modulation and direct-detection (IM/DD) infrared links that has been analytically corroborated in this letter, due to the inherent features of an IM and the average power constraints previously mentioned [5,6] . The better behavior of soliton pulses versus Gaussian and rectangular pulses in terms of BER as a direct consequence of having a higher PAOPR justifies its use in wireless optical links.…”

“…Particularly, the transmitted pulse shape can be adjusted to the channel conditions, keeping the average optical power transmitted at a constant level as a basic design criterion, due to strict ocular safety international regulations. Based on this idea, the authors proposed transmission schemes with Gaussian pulse shapes with reduced duty cycle to improve the performance of traditional schemes based on rectangular pulses [5,6] . In this letter, we propose the use of an optical pulse based on the power pulse shape of the optical soliton [7] for AOC systems.…”

“…Thus, optical soliton pulse shapes are employed to replace conventional rectangular and Gaussian pulses in wireless optical links, as briefly introduced in Ref. [6]. To show the superiority of the proposed pulse, we analyze the performance of rectangular, Gaussian and solitonic pulses shapes in terms of the peak-to-average optical power ratio (PAOPR) and bit error rate (BER).…”

Fade statistics of ℳ ${\mathcal {M}}$ -turbulent optical links

“…In the last decades, free-space optical (FSO) communication systems are receiving considerable attention [1][2][3][4][5][6][7][8] especially thanks to their inherent potential transmission capacity, much higher than that offered by radio transmission technologies. In addition, their narrow beam widths and their inherent license-free operation allows FSO systems to become appropriate candidates for secure, high-data-rate, cost-effective, wide-bandwidth communications.…”

Upper Burst Error Bound for Atmospheric Correlated Optical Communications Using an Alternative Matrix Decomposition

“…To show the superiority of the different pulse, we analyze the performance of Gaussian pulse shapes in terms of the peak-to-average optical power ratio (PAOPR) and burst error rate. Note that the PAOPR is a favorable characteristic in IM/DD infrared links due to the inherent cuadratic response of the optical detector and the average power constraints previously mentioned (Jurado-Navas et al, 2010). For this reason, we use the increase in PAOPR as a figure of merit to compare the different pulses performance, taking into account that a burst error rate analysis must be performed to take into account the temporal variability of different combined sequences and verify that the increase in distortion of shorter pulses does not counteract the PAOPR benefits.…”