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We convert higher order fiber modes into Gaussian beams using binary phase plates, and characterize the resulting M2 and coupling efficiency to single-mode fiber (∼64%). Reciprocally, the system is used to excite modes in multi-mode fiber with purity >13dB.
Off-axis far-field coupling of a broad-area laser to a single-mode fiber containing a fiber Bragg grating is used for spatio-spectral filtering. This results in a ∼10x narrower spectral width and potential spatial brightness improvements.
We experimentally demonstrate the ability to couple any polarization state from a fiber to the TE-mode of a single waveguide in an integrated silicon photonics circuit. We achieved this by combining a 2D-grating coupler and two tunable Mach-Zehnder Interferometers (MZI) into a polarization adapter. We obtain less than ±0.6 dB standard deviation across all input polarization states at a wavelength...
We report on ZnGeP2-based parametric sources pumped by holmium lasers which are resonantly pumped by thulium fiber lasers. Using this scheme, we have built one source with up to 22 W average power and another with more than 0.2 J pulse energy in the mid-infrared region.
We designed and manufactured a high power WDM to enable a high power Raman lasers. We used a custom designed glass processing machine to fuse the WDM. We tested the WDM at 100 W of power with 0.05 dB loss.
We propose and demonstrate a novel design of simple and compact tunable fiber laser skillfully using chromatic aberration of a lens relay and a slit-like effect of optical fiber core.
We experimentally characterize the spatio-spectral properties of photon pairs generated by spontaneous parametric down-conversion in a Type-0 PPKTP waveguide using compressive imaging techniques combined superconducting single photon detectors.
We experimentally observe the spectral dynamics of a passively mode-locked fiber laser by using a parametric spectro-temporal analyzer (PASTA) with a frame rate up to 100 MHz, and different non-repeating transient dynamics has been observed.
We demonstrate soliton self-frequency shifted Very-Large-Mode-Area and HigherOrder-Mode fiber amplifiers. The output wavelength is shifted more than 50 nm with a soliton pulse energy of up to 186 nJ. Subsequent, high-efficiency, frequency doubling is demonstrated.
We report on the generation of 34 fs and 50 μJ pulses from a high energy fiber amplifier system with nonlinear compression in an air-filled hypocycloid-core Kagome fiber. The unique properties of such fibers allow to bridge the gap between solid core fibers-based and hollow capillaries-based post-compression setups, thereby operating with pulse energies obtained with current state-of-the-art fiber...
Power scaling of narrow-linewidth thulium-doped fiber superfluorescent source with wavelength tunable from 1940∼2010nm is reported. The all-fiber superfluorescent source yielded 364W of output power at central wavelength of 1980nm with 3dB spectral bandwidth of 1.9nm.
Fabrication and characterization of optical leaky wave antennas with dielectric waveguides and semiconductor perturbations is presented. Directive radiation at 1550nm is measured. Detailed study on electrical modulation capability with bandwidth exceeding 75GHz is presented.
This paper proposes a phase-insensitive fiber parametric amplifier system that outputs a phase-clamped signal. It consists of an orthogonally pumped fiber with polarization-aligned signal input and a fiber loop with a polarization beam splitter.
We review recent progress in ultra-high capacity transmission based on dense space division multiplexing (DSDM) for future scalable optical transport networks, and present the latest multi-core multi-mode fiber, spatial multi/demultiplexers, and MIMO signal processing technique.
Pre-chirp managed nonlinear amplification delivering high quality 60 fs pulses is compared to conventionally employed CPA. We present a compact rod-type system that outputs >100 W at 75 MHz.
Mode division multiplexing of modes in a silicon waveguide supporting three optical modes is demonstrated in the silicon on insulator platform. Cross-talk suppression of 17dB and 12dB are obtained for the zeroth and second order modes respectively. The extinction bandwidth is observed to increase with the mode order indicating a stronger cross coupling coefficient as the mode order is increased. The...
We report the development of nanodiamond-doped tellurite fibers with both preserved single photon emission properties of the nanodiamonds embedded in the glass and fiber loss reduced to levels suitable for practical applications.
Using a newly developed technique, we measure the complete spatiotemporal field of ultrashort pulses emerging from dual-mode optical fibers, finding spatiotemporal complexity, introduced by the different spatial modes, having different group velocities and modal dispersions.
We report supercontinuum generation from 1250–2600 nm using a 2-cm-long silicon nitride waveguide pumped with an all-fiber femtosecond laser source at 1920 nm.
We demonstrate that a |q|=1/2 plate plus polarization optics can tunably excite all linear combinations of |l|=1 fiber OAM modes with up to ∼30 dB purity, enabling switch fabrics in fiber-OAM networks and disentangling of degenerate mode mixing effects in long fibers.
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