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Filters
Page 32 of The Trend in Engineering Vol. 9, Issue 3
[page]
1957
The Trend in Engineering
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In order to function well as a filter, the loaded guide would have to be reasonably well matched to the lines connecting both ends of the filter guide over the passbands. ...
Thus, one possible use of this dielectric guide is a microwave bandpass or band-elimination filter. ...
Phase matching, quasi-phase matching, and pulse compression in a single waveguide for enhanced high-harmonic generation
2005
Optics Letters
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We demonstrate, for the first time to our knowledge, that the efficient region of high-harmonic generation can be shifted from lower to higher photon energies by combining phase matching, quasi-phase matching ...
An intrawaveguide pulse compression process that works through a combination of ionization-induced refraction and guiding shortens the laser pulse as it propagates through an Ar-filled waveguide. ...
matching at high energies owing to QPM and guiding of a shorter laser pulse that evolves in the waveguide. ...
doi:10.1364/ol.30.001971
pmid:16092236
fatcat:gnmbc3s4xzglndw7rwaexysh4m
High-speed optical signal processing potential of grating-coupled waveguide filters
1991
Applied Optics
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It is first shown that such a device can act as its own matched filter for impulsive excitation, which allows its use as an encoder and decoder of ultrashort pulses. ...
8 We demonstrate in this paper that a number of suitable guided-wave optical grating types already exist that may also be used as coherent matched filters. ...
Fig. 1 . 1 All-optical encoding and decoding scheme for spread-spec-
Fig. 3 . 3 (a) TE-TM mode converter filter, (b) an interwaveguide mode converter filter, and (c) a phase-matching diagram for gratingassisted ...
doi:10.1364/ao.30.003762
pmid:20706455
fatcat:suujeek5tjhx3jficql6pyitmq
Design considerations for a novel phase-contrast adaptive-optic wavefront sensor
2002
Adaptive Optics Systems and Technology II
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Such a WFS would be implemented by inserting a focal-plane filter with a π/2 phase-shifting central spot having a transverse size of the order of the diffraction limit. ...
The phase-contrast approach might derive some advantages stemming from its more natural match to the control eigenvectors of the electrostrictive deformable mirrors that are expected to predominate in ...
The filter has an additional optical thickness of π/2, and has a transverse size roughly matching the diffraction-limited spot size. ...
doi:10.1117/12.454812
fatcat:uokqtjekynb2zj5ppucnz53s3m
Analysis of the effect of radio frequency interference on interferometric phase
2010
2010 IEEE International Geoscience and Remote Sensing Symposium
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(e) Matched filtering result in range after interpolation. (f) Matched filtering result in azimuth after interpolation. ...
(e) Matched filtering result in range after 10 times interpolation. (f) Matched filtering result in azimuth after interpolation. ...
doi:10.1109/igarss.2010.5651776
dblp:conf/igarss/DingXL10
fatcat:6urjhygnkveypokxqpcrfx5zd4
Squeezing in a LiNbO3 integrated optical waveguide circuit
2002
Optics Express
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The device integrates a secondharmonic-generation stage, waveguide couplers, spatial mode filters, and a degenerate-optical-parametric-amplification stage. ...
These guides, therefore, behave similarly to single-moded devices, but the larger width ensures noncritical phase-matching, allowing for larger fabrication tolerances. ...
The SH is also generated in its fundamental spatial mode due to the phase-matching condition. ...
doi:10.1364/oe.10.000177
pmid:19424347
fatcat:dfso6xtecjcqjcad7sv47ruppa
Phase-Matched Generation of Coherent Soft X-rays
1998
Science
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Fig. 1 . 1 Experimental set-up for phase-matching of soft x-rays in a capillary wave guide. The inset shows the growth of the x-ray wave when phase-matched. ...
Because the fundamental wave guide mode is now phase-matched to create the x-ray output, the x-rays generated have excellent spatial properties. ...
doi:10.1126/science.280.5368.1412
pmid:9603725
fatcat:k4ofn3lsxjeardonqk772f7ygu
Content-Based Guided Image Filtering, Weighted Semi-Global Optimization, and Efficient Disparity Refinement for Fast and Accurate Disparity Estimation
2016
IEEE transactions on multimedia
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The pixel-based matching costs are filtered by applying guided image filtering, which relies on rectangular support windows of two different sizes. ...
This paper presents a novel approach, which relies on content-based guided image filtering and weighted semi-global optimization for fast and accurate disparity estimation. ...
The content-based guided image filtering in "Phase B" significantly enhances the initial disparity map. ...
doi:10.1109/tmm.2015.2505905
fatcat:mndclf2kf5atbdg3hcgbwbjioy
A Fast Trilateral Filter-Based Adaptive Support Weight Method for Stereo Matching
2015
IEEE transactions on circuits and systems for video technology (Print)
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guided filter weight function produces a lower average error. ...
The boundary strength at pixel p is defined as [3] , E(p) = ∑ θ (I(p) * F θ ,odd ) 2 + (I(p) * F θ ,even ) 2 , (5) where * denotes the convolution operator; the odd-phase filter F θ ,odd and even-phase ...
doi:10.1109/tcsvt.2014.2361422
fatcat:qihvdpo42vgeronrnjhta7cfb4
Combined matched filter and arbitrary interpolator for symbol timing synchronization in SDR receivers
2010
13th IEEE Symposium on Design and Diagnostics of Electronic Circuits and Systems
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This paper describes a low complexity multi-rate synchronizer that makes use of a polyphase filter bank to simultaneously perform matched-filtering and arbitrary interpolation for symbol timing synchronization ...
Arbitrary Interpolation between available sample points is achieved by selecting the appropriate filter in the bank having the polyphase partitioned matched filter, which provides the optimal sampling ...
In the first approach having separate interpolation and match filter, the timing error signal guides the interpolation filter re-sampling operation to achieve the timing synchronization. ...
doi:10.1109/ddecs.2010.5491797
dblp:conf/ddecs/AwanK10
fatcat:ysvc4lert5h5tjpiecu5dhn7u4
On-sky demonstration of matched filters for wavefront measurements using ELT-scale elongated laser guide stars
2017
Monthly notices of the Royal Astronomical Society
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We demonstrate use of a matched filter algorithm for the processing of elongated laser guide star (LGS) Shack-Hartmann images, using the CANARY adaptive optics instrument on the 4.2m William Herschel Telescope ...
From the results of a first observing run, we show that the use of matched filtering improves our adaptive optics system performance, with increases in on-sky H-band Strehl measured up to about a factor ...
Figure 5 . 5 A figure showing, for the 7 × 7 sub-apertures of the CANARY phase D LGS, (a) an on-sky matched filter x component, (b) the matched filter y component, (c) I 0 , (d) G x and (e) G y . ...
doi:10.1093/mnras/stx062
fatcat:xzodsxtlhnf3hamesezjvwoisu
Polymeric-waveguide-based integrated optical signal processing circuits
2004
Active and Passive Optical Components for WDM Communications IV
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In this paper, design examples such as dynamic channel equalizer, optical CDMA encoder and matched filter are analyzed. Simulation results are presented. ...
The guiding multi-mode waveguide and the dumping planar waveguide, separated by a low-index polymer buffer layer, are designed to achieve phase-matches between the coupling mode of the guiding waveguide ...
lossless; upper line: phase-mismatched lossless; lower line: phase-matched with loss of -6.5dB/cm; middle line: phased-mismatched with loss of -6.5dB/cm, oscillating line:phase-matched, no loss. ...
doi:10.1117/12.570804
fatcat:5wq2mkvqbbcb7jr2wxodtsc6dm
Corrugated horn design for HFI on PLANCK
2002
AIP Conference Proceedings
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The modelling of the horns uses a rigorous electromagentic mode matching technique that is found to give good agreement with measurement. ...
Careful modelling using the mode matching approach was therefore required to optimize the wave-guide filter operation for either single mode operation (where the wave-guide acts as the high pass filter ...
The high frequency channels on the HFI employ multi-moded horns with the number of modes being determined by the wave-guide filter properties (guide radius and corrugation depths). ...
doi:10.1063/1.1475645
fatcat:agjedomko5h4tpohypldrckh7m
Frequency doubling in cavity-resonator integrated grating filter
2020
High Contrast Metastructures IX
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However, their operation relies on a non-localized and large-area guided mode that limits the achievable power density and requires complex phase-matching approaches. ...
Guided Mode Resonant Filters (GMRFs) have long been studied as a support surface for nonlinear optical interactions due to their intrinsically high Q-factor. ...
INTRODUCTION Guided Mode Resonant Filters (GMRFs) have been studied as devices for nonlinear optical interactions due to their intrinsically high Q-factor 1, 2 . ...
doi:10.1117/12.2542771
fatcat:gfvhnzxuzvh7thoxnuyubeiqxi
GUIDED-MODE RESONANCE FILTER COMPENSATED TO OPERATE ON A CURVED SURFACE
2013
Progress In Electromagnetics Research C
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Guided-mode resonance filters (GMRFs) are highly compact structures that can produce a strong frequency response from a single thin layer of dielectric. ...
Under a precise phase matching condition, the grating partially couples externally propagating waves into guided modes within the slab. ...
When the applied wave is given some angle of incidence, the phase matching condition changes. ...
doi:10.2528/pierc13041209
fatcat:rsp3spgctbb7lomsa2et2qoud4
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