31.1 Silicon Photonics Fundamentals 31.1.1 A historical perspective 30.1.2 Silicon waveguide 30.2 Coupling Light to Silicon Waveguides 30.2.1 Problem of external coupling 30.2.2 Nonvertical taper (NVT) 30.2.3 Grating coupler 30.2.4 Nanotaper 30.3 Resonant Structures 30.3.1 Principle of directional coupling 30.3.2 Mach-Zehnder interferometers 30.3.3 Ring Resonators 30.4 Modulation of Optical Sig...

We propose a novel quantum cryptographic protocol without using polarized photons The protocol consists of an optical coupler and four nonorthogonal coherent states which are analyzed by means of quadrature phase amplitudes of quantized light eld

We present a method of analysis of prism-film coupler spectroscopy based on the use of transfer matrix and genetic algorithm, which allows the simultaneous determination of refractive index, thickness, and optical losses of the measured layer.

Thermal noise in multilayer optical coatings may not only limit the sensitivity of future gravitational wave detectors in their most sensitive frequency band but is also a major impediment for experiments that aim to reach the standard quantum limit or to cool mechanical systems to their quantum ground state. Here, we present the experimental realization and characterization of a cavity coupler...

In this paper, we present the design and simulation of silicon-on-insulator (SOI) based integrated optic Directional Coupler. Planar waveguide devices based on SOI architecture offer attractive possibility of miniaturization because of the high difference in refractive index between Silicon and SiO2. It has been shown that this technology offers the ability to make devices with sharper bends wi...

A prototype free-space-wave drop demultiplexer consisting of a cavity-resonator-integrated grating input/output coupler (CRIGIC) and a different-guided-mode-coupling distributed Bragg reflector (DGM-DBR) was designed for constructing a high-density wavelength-division-multiplexing intra-board chip-to-chip optical interconnection. The CRIGIC consists of one grating coupler and two DBRs, and can ...

We present an optofluidic nonlinear coupler fabricated by selective filling of two strands of a photonic crystal fiber with the liquid CCl4 which exhibits a large ultrafast Kerr nonlinearity. We demonstrate power dependent switching in this novel optofluidic device. The large thermo-optical effect of liquids enables us to tune the behavior of the nonlinear coupler by changing the coupling stren...

In this work, we report the realization of a polarization-insensitive grating coupler, single-mode waveguide, and ring resonator in GaN-on-Sapphire platform. We provide detailed demonstration material characterization, device simulation, experimental results. achieve coupler efficiency -5.2 dB/coupler with 1dB 3dB bandwidth 40 nm 80 nm, respectively. measure waveguide loss -6 dB/cm. The losses ...

In optical frequency domain imaging (OFDI) or swept-source optical coherence tomography, balanced detection is required to suppress relative intensity noise (RIN). A regular implementation of balanced detection by combining reference and sample arm signal in a 50/50 coupler and detecting the differential output with a balanced receiver is however, not perfect. Since the splitting ratio of the 5...