University of Southern California

University of California

Yan Yan

Alan Eli Willner

Yi Tang

Lin Zhang

Moshe Tur

Steve E Jacobsen

Yang Yue

Yongxiong Ren

Nisar Ahmed

Hao Huang

Moshe J Willner

Qikun Liu

In at least one aspect, a device for Orbital Angular Momentum (OAM) based optical communication includes a first spatial light modulator configured to down-convert a first plurality of higher-order OAM modes from a communication signal to a second plurality of higher-order OAM modes and a first Gaussian mode, a second spatial light modulator configured to drop the first Gaussian mode and add a second Gaussian mode to the second plurality of higher-order OAM modes, and a third spatial light modulator configured to up-convert the second plurality of higher-order OAM modes and the second Gaussian mode to a third plurality of higher-order OAM modes for further communications.

Systems and techniques for orbital angular momentum based reconfigurable switching

Devices and systems which include on-chip waveguides with flattened dispersion are described. In one aspect, silicon nitride slot waveguides that exhibit four zero-dispersion wavelengths with a flattened dispersion over a wavelength range of 500 nm are obtained. The disclosed silicon nitride slot waveguides are used to generate a two-octave supercontinuum from 630 nm to 2650 nm, enabling (a) on-chip generation of 5 fs optical pulses as short as 1.3 cycles, and (b) sensitive single-shot measurements of the absolute carrier-envelope phase using a single integrated waveguide. In another aspect, silicon slot waveguides that exhibits four zero-dispersion wavelengths with a flattened dispersion over a wavelength range of 670-nm are obtained. An octave-spanning supercontinuum is generated in the disclosed silicon slot waveguide, over a wavelength range from 1217 nm to 2451 nm, approximately from bandgap wavelength to half-bandgap wavelength. Input pulses longer that 100 fs can be compressed to 10 fs using the disclosed silicon slot waveguide.

On-chip two-octave supercontinuum generation enabled by advanced chromatic dispersion tailoring in slotted waveguides

Nondegenerate mirrorless four-wave mixing oscillation with frequency tunability is proposed in nonlinear waveguide of the third-order nonlinearity such as silicon waveguide) by using two different spatial modes. As low as &#x2dc;2 W threshold power is obtained in several centimeters long waveguide. In one aspect, a method includes propagating a first wave along an axis of a multimode waveguide in a forward direction, the first optical wave having a first frequency; propagating a second wave along the axis of the multimode waveguide in a backward direction, the second wave having a second frequency; the waveguide configured to support multiple modes, including at least a fundamental mode and a second mode; and the propagating the first wave occurs at a same time as the propagating the second wave to generate a third wave in the forward direction having a third frequency and fourth wave in the backward direction having a fourth frequency.

Mirrorless-oscillation in a waveguide using non-degenerate four-wave mixing

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Los Angeles, CA, United States of America

Yan Yan