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The dispersive wave generated from the higher-order dispersion perturbation is found to limit the Kerr comb performance in microring resonators. A negative fourth-order dispersion can potentially reduce the effect of dispersive wave.

Using beam divergence controlling to mitigate angular error effects in OAM-based FSO links is investigated through simulation and experiment. Results show that controlling beam divergence allows reducing power loss and angular error induced channel crosstalk.

We experimentally insert a flexible number of electro-optical (EO) comb lines into a Kerr frequency comb via EO modulation and demonstrate the use of combined Kerr and EO combs as light sources in coherent communications. The number of EO lines inserted into the Kerr comb can be varied by changing the modulation frequency. Additionally, the inserted EO comb is found to have similar coherence to that of the Kerr comb, as indicated by their linewidths. The high coherence of both the Kerr and EO combs has further been demonstrated in a communication experiment in which the comb lines are encoded with 10 Gbaud quadrature phaseshift- keyed signals. The increased number of comb lines after EO modulation indicates the possibility of obtaining more data channels in optical communications. (C) 2017 Optical Society of America

We experimentally demonstrate optical multicasting using Kerr frequency combs generated from a Si3N4 microresonator. We obtain Kerr combs in two states with different noise properties by varying the pump wavelength in the resonator and investigate the effect of Kerr combs on multicasting. Seven-fold multicasting of 20 Gbaud quadrature phase-shift-keyed signals and four-fold multicasting of 16-quadrature amplitude modulation signals have been achieved when low-phase-noise combs are input into a periodically poled lithium niobate waveguide. In addition, we find that the wavelength conversion efficiency in the PPLN waveguide for chaotic combs with high noise is similar to that for low-noise combs, while the signal quality of the multicast copy is significantly degraded. (C) 2016 Optical Society of America

Multiplexing/demultiplexing of 1008 data channels using orbital angular momentum (OAM) mode-division-multiplexing combined with wavelength-division-multiplexing is demonstrated. 24 OAM modes, each carrying 42 wavelengths, and each wavelength transporting a 100 Gbit/s QPSK signal, are multiplexed, with an aggregated capacity of 100.8 Tbit/s.

We experimentally generate high-coherence primary Kerr combs with multiple sub-lines by using dual pumps and demonstrate the application of a primary comb state in multichannel communications. We find that more than 10 primary comb lines can be generated within the spectrum of modulation instability gain in our microring resonator. The generation is also verified by numerical simulations and the measured linewidth confirms the high coherence of the generated primary comb lines. We also demonstrate the high-coherence characteristics in a coherent communication experiment, in which each comb line is encoded with 20 Gbaud quadrature phase-shift-keyed signals. (C) 2017 Optical Society of America

The generation of primary sub-comb-lines with high coherence using dual pumps in a SiN microresonator is investigated. A total capacity of 400 Gbit/s has been experimentally demonstrated in coherent communications based on the generated combs.

We experimentally demonstrate 7-fold multicasting of 20-Gbaud QPSK signals based on Kerr frequency combs generated in a silicon nitride microresonator. The effect of high phase-noise comb state on the multicasting performance has also been studied.

A tunable orbital angular momentum (OAM) mode filter is proposed. Filtering/blocking selected channels from 4 spatially multiplexed OAM channels is demonstrated. An OSNR penalty of

We demonstrate high-efficient polarization insensitive OAM generation using integrated phase masks and measure their tolerance to the misalignment of incident beams. An 80 Gbit/s communication link of two OAM channels by using phase masks is demonstrated.

We demonstrate a 280 Gbit/s free space communications link utilizing tilted plane wave multiplexing. We measure the system channel crosstalk less then -30 dB and a bit-error-rate is above the FEC limit.

we demonstrate orbital angular momentum modes separation using a geometrical transform-based mode sorter combined with a spatial Fast Fourier Transform. The observed crosstalk between the adjacent modes is

The simultaneous pre-and post-turbulence compensation of multiple orbital-angular-momentum (OAM) modes propagating through turbulent channel is experimentally demonstrated in a bidirectional free-space optical (FSO) link by using a single adaptive-optics system., United States. Defense Advanced Research Projects Agency. Information in a Photon (InPho) Program, Intel Corporation