In wireless optical communication systems, the coherent detection scheme suffers severe performance degradation due to the phase fluctuation and polarization offset. To deal with such challenges, we propose a polarization coherent optical communication scheme with adaptive polarization control (PCPC), where the transmitted continuous-wave light is split into two paths-the binary phase shift keying modulated signal light and the reference light-which are orthogonally polarized and combined before being sent to free space. In the receiving site, the interference between the two lights can effectively suppress the atmospheric turbulence-induced phase fluctuation. Furthermore, we propose an adaptive polarization control scheme for eliminating the polarization offset caused by the transceiver misalignment and the atmospheric turbulence. Performance evaluation of the PCPC scheme with analytical expressions and numerical simulations shows that the PCPC scheme can effectively suppress the phase fluctuation without phase-locked loop and phase tracking algorithm; thus, the PCPC scheme outperforms the traditional coherent modulation in the turbulence channel. An elaborate designed indoor experiment was implemented to verify the scheme performance, where the measured residual phase fluctuation and measured residual polarization offset are both very small, and the experimental bit error rate performance can conform closely to the theory.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1364/JOSAA.35.001204 | DOI Listing |
Ecotoxicol Environ Saf
December 2024
College of Animal Science, Shanxi Agricultural University, Jinzhong 030800, China; Shanxi Key Laboratory of Animal Genetics Resource Utilization and Breeding, Jinzhong 030800, China. Electronic address:
Fish metabolism, growth, development, and physiological conditions are highly sensitive to fluctuations in water temperature. The Ussuri catfish (Pseudobagrus ussuriensis) is an important native economic species in China. However, research on heat stress in P.
View Article and Find Full Text PDFJ Dent Res
December 2024
Institute of Microbiology and School of Dentistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
Microorganisms have co-evolved with a variety of plants and animals, developing complex symbiotic relationships with their hosts and the environment. The diversity of symbionts acquired over time help their hosts to adapt, survive, and evolve more rapidly and efficiently, improving fitness across the lifespan. Understanding these synergistic relationships between humans and their endogenous microbiota may provide valuable information on human physiology and on potential mechanisms associated with the onset of diseases.
View Article and Find Full Text PDFJ Plant Physiol
December 2024
Department of Plant Physiology, Institute of Biology, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159, 02-776, Warsaw, Poland.
Apple (Malus domestica Borkh.) seeds exhibit deep embryonic dormancy. Uniform germination of isolated apple embryos is observed after 40-day-long cold stratification of the seeds.
View Article and Find Full Text PDFZhongguo Zhong Yao Za Zhi
October 2024
State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine Tianjin 301617, China Engineering Research Center of Modern Chinese Medicine Discovery and Preparation Technique, Ministry of Education, Tianjin University of Traditional Chinese Medicine Tianjin 301617, China.
UDP-glucuronosyltransferases(UGTs) are the main phase Ⅱ metabolizing enzymes in the human body, participating in the glucuronidation of various chemicals in the body. Traditional Chinese medicine(TCM) ingredients affect the activities of UGTs involved in drug metabolism, and the fluctuations in the blood concentrations of drugs metabolized by UGTs will lead to the risk of TCM-TCM or TCM-chemical drug interaction, which will cause drug safety problems and affect drug efficacy. Therefore, it is essential to explore the effect of TCM ingredients on the activities of UGTs.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!