Orbital-angular-momentum (OAM) multiplexing technology offers a significant dimension to enlarge communication capacity in free-space optical links. The coherent beam combining (CBC) system can simultaneously realize OAM multiplexing and achieve high-power laser output, providing substantial advantages for long-distance communication. Herein, we present an integrated CBC system for free-space optical links based on OAM multiplexing and demultiplexing technologies for the first time, to the best of our knowledge. A method to achieve flexible OAM multiplexing and efficient demultiplexing based on the CBC system is proposed and demonstrated both theoretically and experimentally. The experimental results exhibit a low bit error rate of 0.47% and a high recognition precision of 98.58% throughout the entire data transmission process. By employing such an ingenious strategy, this work holds promising prospects for enriching ultra-long-distance structured light communication in the future.
Lead-free halide perovskite nanomaterials have aroused enormous attention and have been employed in many optoelectronic devices depending on their outstanding optical properties, especially their intrinsic stability. Regarding ultrafast fiber lasers, their high stability and low cost are crucial aspects of their industrial and scientific application. Thus, the high stable CsCu2I3 micro-rods are an ideal candidate for Saturable Absorbers (SA) in fiber laser systems. Herein, a passively mode-locked erbium-doped fiber laser based on CsCu2I3-SA was demonstrated operating at the communication band. To the best of our knowledge, the fiber laser could operate stably for over 164 days. These experimental results demonstrate that the CsCu2I3 micro-rods are ultra-stable and a promising optical modulation material to produce an ultrafast and long-stability pulse in fiber laser application.
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