We demonstrate a new freedom to handle orbital-angular-momentum order. Using coordinate transformation we realize the bidirectional transformation between orders 2l (l=+5 to −5) and orders l. Mode purity and 2 OAM multiplexing system characteristics after division and multiplication are shown.
We report a transmission of 400 Gbit/s signal over a four channels, 1-meter mode-division-multiplexed free space optical communication link using multiple orbital-angular-momentum beams with non-zero radial indices, achieving a power penalty less than 6 dB.
We experimentally demonstrate a 400-Gbit/s free-space optical communications link over 120 meters on the building roof by multiplexing four orbital angular momentum (OAM) modes (OAM l = ±1, ±3) each carrying a 100-Gbit/s data channel.
This paper reports an experimental demonstration of a 16 Gbit/s millimeter-wave communication link using MIMO processing of 2 OAM modes on each of two transmitter/receiver antenna apertures. Two groups of multiplexed OAM beams, each containing OAM beams of ℓ =1 and +3 are generated and transmitted through two transmitter apertures respectively. The two transmitter apertures are separated with a certain...
We investigate the design parameters for an OAM multiplexing-based free-space optical data link by analyzing power loss, channel crosstalk, and power penalty of the link, considering the misalignment between the transmitter and receiver (displacement, angular error, or their combination). Given a specific link distance, a transmitted beam size design approach is suggested. In addition, we also provide...
We compared power spreading of a partially captured orbital-angular-momentum (OAM) beam by using single and double apertures. Double apertures could help reducing crosstalk from OAMl to OAMl+m by ∼10 dB, where l is an integer and m is an odd number.
We experimentally demonstrate an apodized aperture for receiving OAM beams carrying 50-Gbaud QPSK channels. The performance in terms of power in desired mode and leakage to neighboring modes is compared with a hard aperture.
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