This paper demonstrates a very compact wavelength meter for on-chip laser monitoring in the shortwave infrared wavelength range based on an optimized arrayed waveguide grating (AWG) filter with an integrated photodiode array. The AWG response is designed to obtain large nearest neighbor crosstalk (i.e. large overlap) between output channels, which allows accurately measuring the wavelength of a...

The aim of our investigation was to develop a technique of producing Bragg’s grating couplers on planar waveguides obtained by means of the sol-gel technique. Introducting a light beam into the waveguide structure is in the case of planar optical systems always an essential technological problem, requiring simple and reproducible solutions without extending the waveguide structure too much. The...

A novel solution of broadband asymmetric multisection coupled-line directional couplers has been proposed in which the required coupling of the tightlycoupled section is reduced. The coupling coefficient reduction has been achieved by the appropriate connection of a tightly-coupled section which has been rotated and connected with the remaining sections in such a way that the transmission and c...

We report that the complex conjugate artifact in Fourier domain optical coherence tomography approaches (including spectral domain and swept source OCT) may be resolved by the use of novel interferometer designs based on 3x3 and higher order fiber couplers. Interferometers built from NxN (N>2) truly fused fiber couplers provide simultaneous access to non-complementary phase components of the co...

Insertion loss is an important parameter used to characterize passive fiber-optic components, such as WDM couplers and variable optical attenuators. This article describes an automated insertion loss measurement system which incorporates 980 nm, 1310 nm, 1529 nm and 1561 nm DFB lasers and two internal fiber optic standards. Insertion loss measurements collected with the system for WDM couplers ...

We present a thorough practical design optimization of broadband low loss, terahertz (THz) photonic crystal fiber directional couplers in which the two cores are mechanically down-doped with a triangular array of air holes. A figure of merit taking both the 3-dB bandwidth and loss of the coupler into account, is used for optimization of the structure parameters, given by the diameter and pitch ...

Abstract We propose an in-situ tunable chiral quantum system, composed of a emitter coupled to waveguide based on the Rice-Mele model (where we alternate both on-site potentials and tunnel couplings between sites in array). Specifically, show that chirality photonic bound state, emerges bandgap waveguide, depends only energy qubit; parameter is easy tune many artificial atoms. In contrast previ...

The butler matrix is one of the passive feeding networks used with array antennas to form beams. There are several advantages using this beamforming network. One them that it easy manufacture, and other low in cost. Butler structure consists three microwave components. These directional hybrid couplers, phase shifters, crossovers. A crossover a component cross between two lines high isolation t...

A four-channel wavelength multiplexer/demultiplexer for sparse wavelength division multiplexing was demonstrated using cascaded three-dimensional ~3D! vertical couplers. 17 nm channel spacing with crosstalk less than 15 dB was achieved. Strong coupled vertical couplers were fabricated using wafer bonding to invert a conventionally processed epitaxial layer and bond to a new host substrate. This...