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250-m long 125-µm×315-µm size semi-trench-assisted multicore flat fiber is fabricated using undoped-secondary-cladding as the trench. Crosstalk at 630 nm is fully suppressed in the fiber with 4.2-µm and 27.5-µm core and pitch size, respectively.
In this work, an approach of realizing fiber-based near infrared bandpass filter with parasitic bandgaps suppression is proposed. By doping the core of an all-solid photonic bandgap fiber with lower refractive index material, single-mode light is confined in the main bandgap centered at 1.0 μm wavelength region. Light guiding in higher order bandgaps is suppressed due to the coupling of light to the...
An extended method for gain and noise figure enhancement in the S-band using a thulium-doped photonic crystal fiber amplifier (TD-PCFA) is proposed and shown by numerical simulation. The principle behind the enhancement is the suppression of unwanted amplified spontaneous emission (ASE) using the PCF structure. This proposed PCF achieves the intended band-pass by doping the cladding with high index...
Evanescent field had been widely used in bio and chemical sensors. However in most cases, evanescent field is not maximized and consequently produced an unoptimized sensor performance. It is the aim of the paper to optimize the design of 1∶2 Y-branch splitter optical waveguide through simulation by using FD-BPM. Y-branch splitter are simulated to optimize the power loss. Width of waveguide and effective...
Sensitivity of evanescent field sensor is highly affected by strength of evanescent field with respect to its penetration depth and intensity. However in most cases, evanescent field is not maximized and thus the performance of the sensor is not optimized. It is the aim of the paper to optimize the silicon nitride linear waveguide through simulation by using 3D FD-BPM. The resultant investigation...
We demonstrate a new approach for fabricating multimode interference (MMI) devices using micromachining of a novel flat-fiber platform. A 1×3 splitter has been demonstrated together with spatial output mode control by index tuning of material within micromachined trenches.
We present the effect of epoxy bonding on strain sensitivity of fiber grating sensors. We show experimentally that, on average, sensors mounted onto aluminum plates by epoxy gluing both ends of the Bragg grating (epoxy free grating zone) display 16% more sensitivity to applied strain compared to those with epoxy covering the length of the grating zone (conventional method). We also show that in the...
Direct-UV-written liquid crystal tunable planar Bragg Gratings exhibit complex wavelength tuning with threshold points and hysteresis. We discuss the role of disclinations in the liquid crystal and whether they may allow faster wavelength tuning.
Direct-UV-written liquid crystal tunable planar Bragg Gratings exhibit complex wavelength tuning with threshold points and hysteresis. We discuss the role of disclinations in the liquid crystal and whether they may allow faster wavelength tuning.
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