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Solid core photonic bandgap fibers (PBGFs) incorporate a microstructure lattice of high index rods in a low index matrix surrounding a defect core formed by one or several missing rods. Liquids, which can have a wide variety of absorption, gain, nonlinear, and thermal properties, have been used as the high index medium in such fibers. The modal interaction with the liquid is thus an important consideration...
We report on long-period gratings fabricated in highly nonlinear chalcogenide (As2S3) glass rib waveguides. Coupling the fundamental to higher order modes leads to band- rejection of 18 dB at 1525 nm.
We demonstrate a tunable optical filter/sensor based on a microfluidic interferometer integrated onto a compact planar chip. The interaction of the beam with a water/air interface provides a tunable Mach-Zehnder response with 28 dB extinction ratio.
We report the fabrication of high quality sampled Bragg gratings in highly nonlinear integrated chalcogenide (As2S3) rib-waveguides using a modified Sagnac interferometer. Experimental spectra are in good agreement with theory.
Fluid filled photonic bandgap fibers (PBGFS) incorporate materials with a large thermo-optic coefficient. the modes of these fibers also have very strong waveguide dispersion. we exploit these two properties of PBGFS to demonstrate highly tunable long period gratings.
We present wavelength-dependent measurements of n2 and two photon absorption, characterising the nonlinear figure of merit (FOM = n2 / beta lambda) in a highly nonlinear As2Se3 chalcogenide single mode fiber, from 1415 nm to 1554 nm.
Wavelength tunable 100 GHz pulse trains are generated by reflection of a 10 GHz fibre laser from a three-fold superimposed fibre Bragg grating, followed by wavelength conversion in a nonlinear optical loop mirror.
Recent experiments on supercontinuum generation in the presence of a grating showed that the supercontinuum intensity is enhanced on the long- wavelength side of the Bragg frequency. We give a simple physical explanation for this in terms of four-wave mixing.
We introduce a new type of optical MEMS through an optical micro-fiber waveguide controlled using optical trapping. We also use the mechanical properties of the micro-fiber to measure properties of the optical trap.
We derive a nonlinear wavenumber which describes dispersive wave phase-matching in supercontinuum generation more accurately than the current prescription based on fundamental solitons. The short wavelength peak is well located by this method.
The authors utilized optical trapping as a novel form of micro actuation, demonstrated using an optical micro-fiber that is trapped and spatially directed.
We theoretically investigate the influence of two-photon absorption (TPA) on the performance of self-phase modulation based signal regenerators, showing that a device with TPA can have better performance (higher output Q-factor) than a device with no TPA.
We describe the fabrication of low-loss, highly flexible silica fibre nanowires which are used to characterise chalcogenide two-dimensional photonic crystal waveguide circuits. Localised coupling is achieved in good agreement with theory.
We demonstrate error-free conversion cross-phase modulation based wavelength conversion in 1 m of singlemode As2Se3 chalcogenide glass fiber at 10 Gb/s with less than 2.1 W peak pump power over a 10 nm range, with 1.4 dB excess system penalty.
We recently fabricated chalcogenide photonic crystal slabs (PCSs) using focused ion beam milling. We demonstrated over 98% coupling efficiency to a two-dimensional photonic crystal waveguide in a chalcogenide membrane using evanescent coupling via a tapered optical fibre nanowire. The presentation will discuss the design, fabrication and characterization of chalcogenide-based PCSs and preliminary...
We demonstrate resonant guiding in a chalcogenide glass photonic crystal membrane associated with Fano coupling between free space and guided modes. We obtain good agreement with modeling results based on three-dimensional finite-difference time-domain simulations.
We demonstrate a tunable microfluidic optical interferometer integrated onto a single compact planar chip. The interaction of the beam with a water/air interface provides a Mach-Zehnder like response with a strong extinction ratio (~28dB).
We demonstrate efficient compression of low-power 6 ps pulses down to 420 fs pedestal free pulses at 1.5 mum in an all-fiber scheme employing only 4 meters of As2Se3 fiber and a tailored chirped fiber Bragg grating.
We investigate wavelength conversion by cross-phase modulation in the presence of strong dispersion and two photon absorption in highly nonlinear singlemode As2Se3 fiber, achieving conversion over a span of 30 nm.
We demonstrate the formation of long period gratings in fluid-filled photonic bandgap fiber (PBGF). The unique modal properties of PBGFs allow for coupling to LP11-like modes at multiple wavelengths. We obtain good agreement with simulations.
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