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We demonstrate a broadband THz directional coupler based on a dual core photonic crystal fiber (PCF) design with mechanically down-doped core regions. For a center frequency of 1.3 THz we demonstrate a bandwidth of 0.65 THz.
We propose and analyze a novel design of photonic crystal fiber that allows simultaneous single-polarization single-mode guidance in two wavelength windows centered at 1.55 and 1.31 μm by using a finite-element method.
A fully-etched photonic crystal grating coupler with low back reflections is introduced as an interface between single-mode fibers and silicon-on-insulator wire waveguides. Peak coupling efficiency of 27% and 1-dB bandwidth of 34 nm is achieved.
We propose a new design to achieve single-polarization single-mode guidance in highly birefringent photonic crystal fiber. The suppression of unwanted polarization state is realized by introducing index-matched cladding defect waveguide.
In this paper we present the combination of a pair of specially designed symmetric-pass (s-p) UHMWPE lenses and a THz waveguide made of the cyclo-olefin polymer Zeonex with a core diameter of about 1.4 times the wavelength to achieve coupling efficiencies in excess of 50%. The s-p lens is designed to have no spherical aberrations and the same angle of deviation for both surfaces of the lens. The surfaces...
We theoretically investigate the thermally tunable photonic crystal fiber (PCF) coupler infiltrated with nematic liquid crystals. The thermo-optical responsive NLC offers thermal tunability of the fiber coupler. The proposed design can find promising sensor applications.
Light beam coupling between a single-mode fiber and a highly nonlinear photonic crystal fiber based on fused biconical tapered technique is experimentally demonstrated. As a result, more than 90% coupling ratio are achieved.
We present a twin core photonic crystal fiber nonlinear coupler permitting dispersionless all-optical control of the delay of picosecond pulses. Nonlinear exact solutions illustrate the time delay control principle.
All-optical switching is demonstrated in a photonic crystal resonator evanescently coupled with a micro-fiber. Carrier-induced fast blueshift of resonant wavelength by 1.5 nm is observed at 980 nm pump energy of ~300 fJ.
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