We report a photonic crystal fiber (PCF) coupler having an ultrawide spectral bandwidth keeping single mode operation. The use of the PCF coupler in a fiber-based optical coherence tomography (OCT) system enables us to handle the wide spectral bands of various light sources, including superluminescent diodes (SLDs) at 1300 nm and 820 nm, Ti:sapphire lasers, and white-light sources. The multiban...

An ultra-compact plasmonic-mode-assisted polarization splitter based on directional coupler is proposed and investigated analytically and numerically. A large modal birefringence of > 0.69 is estimated, enabling a clean polarization separation within 5.6 1m. Keywords-Polarization splitters; surface plasmons; plasmonic waveguides

An ultra-compact (coupling length ~ 8.77 m) silicon polarization splitter and rotator is demonstrated based on a bent directional coupler. The peak TM-TE coupling efficiency reaches 96.6%. The crosstalk values are < -10 dB over a wavelength range of 40 nm.

We introduce two novel variants of the serpentine waveguide (SWG) slow wave structure (SWS), often utilized in millimeter-wave traveling-wave tubes (TWTs), with enhanced interaction impedance. Using dispersion engineering conjunction transfer matrix methods, we tune guided wavenumber relation to exhibit stationary inflection points (SIPs), and also nonstationary, or “tilted” (TIPs), within domi...

We study the effect of rotation on the propagation of electromagnetic waves in slow-light waveguide structures consisting of coupled micro-ring resonators. We show that such configurations exhibit new a type of the Sagnac effect which can be used for the realization of highly-compact integrated rotation sensors and gyroscopes. PACS Numbers: 42.60.Da, 42.70Qs When an electromagnetic wave propaga...