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Advances in hollow-core fibers employing Perturbed Resonance for Improved Single Modedness (PRISM) with higher-order mode suppression and polarization maintaining behavior are discussed.
A hollow-core fibre with six shunt cores demonstrates complete higher order core mode attenuation in less than 0.5m, without affecting loss or PM properties when compared with a fibre with two shunt cores.
High energy, 700 μJ, one nanosecond pulses and 490 femtosecond, 50 μJ pulses are demonstrated in an Er-doped, higher-order-mode fiber amplifier. An axicon at the output enables efficient, nonlinearity-free reconversion to a low M2 beam.
For the first time 100Gb/s transmission using commercial low latency hardware is demonstrated over the longest manufactured hollow-core fiber (2.75km) to date, proving the feasibility of ultra-low latency intra-data center connectivity.
The lowest loss hollow core fibers are typically multimode which can limit many applications. Here we demonstrate fibers that, using phase matched coupling, are single mode and by creating asymmetry in the core wall boundary, the fiber is polarization maintaining.
We demonstrate the first measured hollow-core fiber employing Perturbed Resonance for Improved Single Modedness (PRISM) with additional polarization control.
We demonstrate the first low-loss, low-return-loss FC/PC connector for a single-mode, hollow-core fiber. Connector loss of 0.3dB and return loss of −31.3dB was measured, and a 200m HCF jumper with connectors on both ends was fabricated.
A newly-developed, single-mode hollow-core fiber is employed for saturated absorption spectroscopy in a molecular gas. Lack of surface modes, ease of angle splicing, and single-modedness make it promising for portable frequency references.
Single-frequency and narrow-linewidth pulse amplification is demonstrated in an erbium-doped higher-order mode fiber with effective area of 6000m2 and output long-period grating for re-conversion of the output beam back to the fundamental mode.
We demonstrate the first measured dual-hollow-core photonic bandgap silica fiber. We examine its bend-induced coupling characteristics both theoretically and experimentally. Varying the bend diameter of the fiber allows control of the resonant coupling wavelength.
Spatially and spectrally resolved mode imaging of a 19 cell photonic bandgap fiber with minimum loss at 1550 nm is demonstrated using a high resolution tunable laser and phosphor-coated CCD camera.
We create silica microbubbles along a microcapillary with the CO2 laser heating and demonstrate the first optical microbubble resonator. It has 370 micron diameter, 2 micron wall thickness, and Q-factor exceeding 5·105.
We demonstrate a robust double-capillary microfluidic ring resonator optical sensor imbedded into a solid polymer matrix. The device is capable of compensating the temperature and pressure variations and can be generalized to a multi-capillary lab-on-a-chip.
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