Bowang Shu, Yuqiu Zhang, Zhongquan Nie, Shiqing Tang, Jinyong Leng, Pu Zhou
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Steering high-order perfect vector beams in coherent laser arrays for suppressive crosstalk optical links
Coherent beam combining (CBC) has offered an unparalleled approach in achieving high-capacity and high-bandwidth free-space optical (FSO) communication due to its versatile integration functionality and advanced synthetic ability. However, the existing CBC technologies focus primarily on the phase engineering, where crosstalk between different modes is easily involved, thus leading to nontrivial crosstalk in FSO links based on current coherent laser arrays (CLAs). To address this challenge, we propose an encoding method that enables crosstalk reduction via nonorthogonal polarization multiplexing. This is achieved by leveraging concentrically arranged high-order perfect vector beams (PVBs) via well-designed structure of the CLAs. Moreover, the achievable arbitrary high-order PVBs could strongly support the establishment of high-dimensional encoding paradigm. As a conceptual demonstration, we illustrate information transfer case of “NUDT” with zero bit error rate, indicating that the polarization controlled CLA is advantageous in suppressive crosstalk between multi-channels. Compared to phase coupling appearing in coaxial transmitting vortex beams, the observed PVBs display completely independent stable transmitting paths. Therefore, the manipulation of high-order vector beams within the CLA system is hopefully continuously improving the performances of optical links.
期刊介绍:
Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology.
In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics.
APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field.
Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.