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We propose reconfigurable optical add/drop multiplexing in a data link using orbital angular momentum (OAM) mode division multiplexing. Adding/dropping of one OAM mode from three multiplexed OAM modes, each carrying 100 Gbit/s QPSK data is demonstrated, with an OSNR penalty of <; 2dB.
We demonstrate OAM-based reconfigurable optical switching functions among multiple OAM modes. Three-pair OAM modes exchange shows 3.6-dB conversion efficiency and selective data exchange among three 100-Gb/s QPSK OAM channels has a 2.1-dB OSNR penalty.
The efficient mitigation of crosstalk-induced “error floor” in system performance by using soft-decoding LDPC codes in an OAM-based four modes multiplexed fiber transmission system is experimentally demonstrated. A significant coding gain of >15.5 dB is achieved, depending on the amount of crosstalk from other channels.
We experimentally demonstrate the add/drop multiplexer for two orbital angular momentum (OAM) modes carrying 100-Gbit/s RZ-QPSK channels. An OSNR penalty of < 1.6 dB for added and dropped channels is observed.
Single-ring fiber can support 10 OAM modes while maintaining radially sing-mode condition. The crosstalk between the modes is less than −20 dB even in a 1%-ellipticity fiber. OAM0,4 can propagate 500-km with <10-ps mode walk-off.
We simulate and analyze the mode properties and propagation effects of orbital angular momentum (OAM) modes in a ring fiber. A ring fiber with 0.05 up-doping is designed in simulation to support up to 10 OAM modes while maintaining single-mode condition radially. With a multiple-ring fiber, tens of OAM modes can be potentially multiplexed to greatly enhance the system capacity and spectral efficiency...
We propose an approach to generate and multiplex 7 OAM spatial modes using a ring fiber launched by the light from multiple single-mode fibers. The purity of each OAM mode can be >99%.
An angular sliced LG beam rotates +90 or −90 degree and maintains the fan shape and spiral phase in the far field. It enables a new scheme of spatial-mode division multiplexing system in free space communication.
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