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The stochastic characteristics of a 3×3 MIMO RF channel enabled by two-mode graded index fiber are experimentally investigated in terms of Rice K-factor and condition number of channel matrix over different fiber reach. The results show that spatial multiplexing benefits from longer fiber reach despite of higher optical loss.
We propose a novel pilot-carrier scheme which has SPM and phase-noise tolerant characteristics. The pilot-carrier is intensity-modulated and multiplexed with the modulated optical signal. It was clarified that the proposed scheme improves the SPM tolerance in comparison with the conventional scheme using an intensity-constant pilot-carrier.
A deployment scenarios of space division multiplexing (SDM) in metro area network is presented. Comparative studies of few-mode fiber vs. multicore fiber as well as mode division multiplexed (MDM) node architectures of supermode vs. mode-unbundling are discussed.
A 14-mode polarization-maintaining ring-core fiber (PM-RCF) is designed for spatial division multiplexing optical networks, which is compatible with single-mode fibers. All the modes are separated from their adjacent modes with effective refractive index differences larger than 10−4 whatever the PM-RCF is straight or bent at C-band.
Mode division multiplexed(MDM) in few mode fibers has gained attraction due to its potential to achieve ultrahigh capacity beyond the nonlinear Shannon limit of the single mode fiber. However, it cannot be ignored that the effect of crosstalk, mode coupling and differential mode group delay on optical signals exists in transmission and equalizing these impairments are required in the digital signal...
A five-mode multiplexer/demultiplexer based on a partially elongated five-core fiber is presented. Multiplexing operation is experimentally verified. Mode selectivity higher than 95% at 1550 nm, for both the LP11 and the LP21 mode, is achieved.
We investigate the mode propagation and coupling in multimode fibers, based on modeling the wave propagation through the coupled power equation. Using this model, the power evolution of the various propagating modes in fibers can be visualized and the impact of mode-dependent loss and mode coupling can be quantitatively analyzed.
State of the art glasses-free multi-view 3D displays suffer from the number of views/resolution tradeoff due to the dependence on spatial image multiplexing only. To overcome this trade-off we are developing spatiotemporal multiplexed display systems where the fast frame rate potential of organic light emitting diode (OLED) displays is utilized. By producing narrow viewing zones in the viewing field...
We present a graded index ring-core fiber for long-distance OAM mode transmission. Due to the graded index profile of the ring-shaped fiber core, the supported OAM modes are more pure and degenerate than those in the step-index ring-core fibers. A simple ring-core fiber design scheme is introduced. This scheme illustrates the relationship between the mode effective refractive indices and the designed...
A scheme to simultaneously detect topological charges of coaxial multiplexed perfect vortices, is proposed experimentally. The coaxial multiplexed perfect vortices can be divided and transformed into 0-th order Bessel-Gauss beams in different diffraction orders according to their various topological charges.
A world record capacity 118.5 Tbit/s transmission through optical fiber with a 125 micron cladding diameter was achieved using a low loss and 316 km-long full space division multiplexing link incorporating multiple vendor technologies.
We proposed, for the first time, a MPLC based programmable multi-port mode switch that can support m mode channels by using 2m + 1 times plan optical conversation. A 1×3 port mode switch with one mode channel is simulated by using 3 phase plates. Mode conversation and switch are performed with insertion loss less than 0.5dB and crosstalk less than −23.5dB.
We experimentally 3-mode mode division multiplexing (MDM) transmission over conventional 7-km multi-mode fiber (MMF). 10-Gb/s intensity modulation and direct detection (IM-DD) are employed. The weakly-coupled mode multiplexer/demultiplexer are realized by cascading mode-selective couplers (MSCs).
The vector-based quality equalization method is proposed to mitigate the core-to-core Q-difference for multicore fiber transmission. The multiple signals are combined and separated with transfer function in vector domain. It is confirmed that it is effective at larger SNR difference case compared to the bit-based equalization method numerically.
We design and fabricate a thermo-optic switchable three-mode (de)multiplexer with two cascaded vertical polymer-waveguide directional couplers. At 1550 nm, the switching power required is ∼20 mW and the response time is ∼3 ms.
A step-index 10-mode (6-LP-mode) fiber (10MF) with large effective index differences is fabricated and experimentally validated for weakly-coupled few-mode transmission. Modal crosstalk of less than −13.9 dB between 6-LP modes was achieved in an 81-km long 10MF with a pair of mode multiplexer and demultiplexer.
Design tools for circular PCF have been developed to analyze the vector modes by giving the modal map of the cutoff condition of eigenmodes and colormap of minimum effective refractive index separation between different eigenmodes. We also analyze the effect of fiber parameters for mode quality.
We newly proposed a variable mode power ratio method for measuring the attenuation coefficient of few-mode fiber (FMF). We confirmed that the experimental results agree well with those of existing methods, namely the mode-selective launch method and the OTDR method, as regards the measurement of attenuation coefficients for both the LP01 and LP11 modes. The variable mode power ratio method does not...
We propose a homogeneous coupled w-type four-core fiber. By adding trench structures around the cores, the lower differential mode group delay (DMGD) between the fundamental and higher-order supermodes is realized.
We propose a unique concept to implement a higher-order mode pass filter using mode-converters. The proposed filter has a simulated extinction ratio greater than 20 dB with an excess loss less than 0.6 dB in the C-Band.
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