Processing math: 100%
Peter E. McKenna - IEEE Xplore Author Profile

Showing 1-25 of 34 results

Filter Results

Show

Results

A grating coupler based on \text{N}\text{b}_{2}\text{O}_{5} waveguides in the integrated probe for three-dimensional (3D) velocity distribution measurements is presented. Multiple layers under the grating core are designed for improving the coupling efficiency of both the input and output grating couplers.Show More
This paper presents a differential laser Doppler velocimeter (LDV) for simultaneous measurement of three-dimensional (3D) velocity distribution combining spatial encoding by bias-frequency assignment and wavelength encoding. An experiment to detect one wavelength is conducted as a first step of verifying the effectiveness of the proposed method.Show More
We propose a differential laser Doppler velocimeter (LDV) for three-dimensional velocity distribution combining spatial encoding by bias-frequency assignment and non-mechanical scanning of measurement points. The results indicate that 3D velocity distribution measurement was successfully demonstrated.Show More
A grating coupler that employs multiple Nb2O5/SiO2 layers is designed to improve the input/output efficiency in the Nb2O5- based integrated probe for two-dimensional cross-sectional velocity distribution measurements. As the result of simulation, the efficiency was improved by increasing the number of the Nb2O5/SiO2 layers over the assumed input/output angles and wavelengths.Show More
An integrated probe using Nb2O5 waveguides is presented for two-dimensional cross-sectional velocity distribution measurements. The chirped focusing grating used for waveguide-air coupling is designed and its efficiency is calculated. The scanning function of the probe using the grating couplers is simulated.Show More
A laser Doppler velocimeter employing 7×8-channel spatially encoded measurement points is proposed for simultaneous cross-sectional velocity distribution measurements. The measurement points arranged in two dimensions are encoded by combining wavelength-division multiplexing and multiple bias-frequency encoding. The functionality of the proposed method was experimentally demonstrated.Show More
A Si-based integrated probe is proposed for cross-sectional velocity distribution measurements. The measuring principle is based on a combination of simultaneous multipoint measurement using spatial encoding and nonmechanical scanning. The scanning function of the probe employing chirped focusing grating couplers in the transmitting optics is simulated.Show More
We investigate through simulation simultaneous linear and nonlinear impairments using a realistic reconfigurable optical add drop multiplexer (ROADM) model while considering optical filtering and in-band coherent crosstalk at each ROADM and the nonlinear interfering effects from neighbor superchannels with the QPSK or 16QAM modulation format.Show More
We propose a programmable multicarrier generator (MCG) as a key enabler to flexibly establish and regenerate multiple superchannels to connect various source-destination pairs. We design the programmable MCG with an integrated periodical optical filter array and show precise and flexible spectrum control of multiple subcarriers generated from individual tunable laser diodes.Show More
We review our proposed concept, the “e-JIKEI Network”, and relating social activities. Recently, security camera has attracted considerable attention for improving security in public places such as the station, shop, and street which is full of people's traffic. However, in the local community which is more important for individual person, installing of security camera makes little progress becaus...Show More
A non-mechanical axial scanning laser Doppler velocimeter (LDV) with directional discrimination using a single transmission path is proposed. The axial scan and directional discrimination has been demonstrated experimentally using a sensor probe setup.Show More
A statistical model of chromatic dispersion (CD) in filters using arrayed waveguide gratings (AWGs) with random phase errors is proposed. The average and variance of CD in the passband can be calculated using simple expressions.Show More
A statistical model is proposed for estimating the chromatic dispersion in the passband of a filter using an arrayed waveguide grating (AWG) with random phase errors. The model is derived without assuming the independence of random errors and can be applied to AWGs with frequency-dependent array amplitude coefficients as well as conventional AWGs. The average and variance of the chromatic dispersi...Show More

Non-Mechanical Dual-Axis Scanning Laser Doppler Velocimeter

Koichi Maru

IEEE Sensors Journal
Year: 2012 | Volume: 12, Issue: 8 | Journal Article |
Cited by: Papers (3)
A dual-axis scanning laser Doppler velocimeter (LDV) without any moving mechanism in its sensor probe is proposed. In this LDV, the measurement position is scanned in both axial and transversal directions with one probe. The direction of the scan is changed by changing the polarization of the beam input to the probe. The results of the experiment using a setup of the sensor probe consisting of bul...Show More
The filtering performance of a synchronized-router-based flat-passband filter with random phase errors is analyzed. For this purpose, an analytical model of a synchronized-router-based flat-passband filter using a multiple-input arrayed waveguide grating (AWG) with phase errors is derived without the assumption of the independence of random errors so that the model can treat general types of phase...Show More
2-D laser Doppler velocimetry without polarization discrimination, wavelength discrimination or frequency-shift discrimination is proposed. In the proposed velocimetry, scattered beams in different directions are monitored with two detection blocks in order to discriminate the direction of velocity. The principle of the proposed velocimetry is described and the discrimination of velocity direction...Show More
A differential laser Doppler velocimeter (LDV) with enhanced wavelength range for small wavelength sensitivity is proposed by using cascaded Mach-Zehnder interferometers (MZIs) for shifting the position of the beam at the input plane according to the wavelength. The cascaded MZI structures are used to enhance the position shift of the beam at the input plane compared with the use of single-stage M...Show More
In this paper, a design of an integrated wavelength-insensitive laser Doppler velocimeter (LDV) has been proposed using planar lightwave circuit (PLC). The proposed LDV uses arrayed waveguide gratings (AWGs) that can be fabricated using PLC technology. Its characteristics are simulated using a design model based on grating equations for AWGs. The simulation results indicate that wavelength-insensi...Show More
A frequency estimation method (ZFM: zero-crossing fitting method) for measuring time-varying single frequency is applied to determine the velocity of the mass for a space scale. The difference between the ZFM and conventional zero-crossing method used in typical electric frequency counters is discussed. The velocity derived from estimated Doppler frequency is evaluated with considerably lower leve...Show More
A method for precision force measurement by using the levitation mass method (LMM) is reviewed. In this method, a mass levitated using a pneumatic linear bearing with sufficiently small friction is made to collide with the object being tested, and the instantaneous value of the impact force is measured as the inertial force acting on the mass. The velocity and acceleration of the mass are measured...Show More
This paper demonstrates novel spot size converters (SSCs) with vertical taper, which is fabricated by simple processes based on sputter etching. The relationship between pressure condition of sputter etching and base angle of core cross-section is shown. With these investigations, coupling losses between SSCs and single mode fibers can be reduced to about 0.3 dB.Show More
We demonstrate multi/demultiplexers with a very flat passband and small excess loss using a multi-input arrayed waveguide grating combined with a cascaded Mach-Zehnder interferometer structure. We also analyze the impact of coupling between input waveguides just before the input slab on chromatic dispersion and investigate a waveguide structure for reducing the chromatic dispersion. We fabricated ...Show More
We present a theoretical model of a multi-input arrayed waveguide grating (AWG) based on Fourier optics and apply the model to the design of a flattened passband response. This modeling makes it possible to systematically analyze spectral performance and to clarify the physical mechanisms of the multi-input AWG. The model suggested that the width of an input/output mode-field function and the numb...Show More
This paper proposes a dynamic gain equalizer (DGE) using hybrid integrated silica-based planar lightwave circuits (PLCs) with a LiNbO/sub 3/ (LN) phase shifter array to achieve a DGE that offers both excellent optical performance and control of the phase shifters. The structure consists of two PLCs having arrayed-waveguide gratings (AWGs) and couplers directly attached to the LN phase shifter arra...Show More
We describe a novel structure for super-high-/spl Delta/ athermal arrayed waveguide gratings (AWGs) employing spot-size converters based on a segmented core formed in the slab region, to reduce the diffraction loss in resin-filled trenches. This structure requires no depth-tapering process. We demonstrated a compact 16-channel athermal AWG based on the 2.5%-/spl Delta/ silica waveguides. The exces...Show More