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A multiple-layer-overlay (MLO) modulation format is employed for a 14-km optical fiber link and an enhanced spectral efficiency of 2.36 bits/s/Hz is achieved by multiplexing 3-layer signals with each layer carrying a 2-Gbit/s QPSK signal.
We report a transmission of 3 Gbit/s signal over a 4-km grade-index multimode fiber within a bandwidth of 2.54 GHz using multiple-layer-overlay (MLO) modulation format, achieving a spectral efficiency of 1.18 symbols/s/Hz.
We experimentally demonstrate space division multiplexing in a basis of vector modes. Vector modes are a modal bases set, which have spatially varying polarization. Our experimental realization operates with link capacity of 160 G-bit/s, modal crosstalk and BER results are presented.
We present a quasi-optical component for the simultaneous de-multiplexing of multiple channels by the transformation of OAM into transverse momentum. A communications link comprising 4 independent channels is demonstrated achieving a data rate of 8 Gbit/s.
In this paper, we present a free-space link utilizing orbital angular momentum (OAM) multiplexing, where only a proportion of the beam is received. Partially receiving an OAM mode could lead to crosstalk between neighboring modes. Here, we analyzed the effect of the aperture size on the system crosstalk both numerically and experimentally. We also demonstrated an optical data link with a total capacity...
Turbulence-induced crosstalk and system penalty for an OAM-multiplexed free space optical communication link is experimentally investigated. The power penalty is found to exceed 10 dB in weak turbulence condition due to severe crosstalk.
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.
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.
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