Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Adam R. Wichman"'
Autor:
Lawrence E. Larson, Adam R. Wichman
Publikováno v:
IEEE Transactions on Signal Processing. 66:4516-4526
We report a new correlation-based direct sequence spread-spectrum technique that estimates low-pass-equivalent Volterra coefficients for weakly nonlinear RF systems. The methodology provides robust coefficient estimates at test signal amplitudes well
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::047c98d40ecaba30ff04be327fdbf724
https://doi.org/10.1109/tsp.2018.2855651
https://doi.org/10.1109/tsp.2018.2855651
Autor:
Adam R. Wichman, Jean Kalkavage, Eric J. Adles, Thomas R. Clark, Jonathan Klamkin, Yuan Liu, Brandon Isaac
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics. 24:1-10
Three optical ring resonator (ORR)-based integrated ultra-low-loss silicon nitride $\text{1}\times \text{4}$ optical beamforming networks (OBFNs) for millimeter-wave (mmW) beamsteering are reported. The group delay ripple of multi-ORR delay line was
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d74b0b2a6b49e64c4b373385d46eeb68
https://doi.org/10.1109/jstqe.2018.2827786
https://doi.org/10.1109/jstqe.2018.2827786
Autor:
Jean Kalkavage, Eric J. Adles, Thomas R. Clark, Brandon Isaac, Jonathan Klamkin, Yuan Liu, Adam R. Wichman
Publikováno v:
Journal of Lightwave Technology. 35:4954-4960
Comprehensive tuning optimization of an integrated optical ring resonator (ORR) based $1\times 4$ optical beam forming network (OBFN) for W-band millimeter wave (mmW) phased arrays is reported. The OBFN chip is implemented using a ultralow loss silic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d9b331aa9faa50c8647f46fb98280f05
https://doi.org/10.1109/jlt.2017.2762641
https://doi.org/10.1109/jlt.2017.2762641
Publikováno v:
Fiber and Integrated Optics. 34:159-174
This article presents recent developments in millimeter-wave communications architectures featuring broadband photonic signal generation, up-conversion and down-conversion, as well as true-time-delay photonic steering of millimeter-wave arrays. These
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3546680319fd8371809376912a539c8f
https://doi.org/10.1080/01468030.2015.1063741
https://doi.org/10.1080/01468030.2015.1063741
Publikováno v:
Journal of Electronic Materials. 44:3134-3143
This paper presents results from three-dimensional quantitative modeling on dense, moderately doped [ND (NA) = 5 × 1015 cm−3] short-wave infrared (SWIR) p+n and n+p Hg1−xCdxTe double planar heterostructure photodetecting arrays with absorber x =
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2704bfa026d7d36ff465a85330c0bf60
https://doi.org/10.1007/s11664-015-3831-4
https://doi.org/10.1007/s11664-015-3831-4
Publikováno v:
IEEE Transactions on Electron Devices. 62:1208-1214
A novel room-temperature negative differential resistance (NDR) effect is proposed, theoretically analyzed, and quantitatively modeled for short-wave infrared (SWIR) HgCdTe photodiode detectors in dense double-layer planar heterostructure arrays with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::48070327eac5ff65a0dfa1eb64b65d9b
https://doi.org/10.1109/ted.2015.2406312
https://doi.org/10.1109/ted.2015.2406312
Publikováno v:
Journal of Electronic Materials. 44:2981-2989
Finite-difference time-domain and finite element method simulations are used to evaluate two-dimensional spot-scan profiles of p-on-n double-layer planar heterostructure (DLPH) detector arrays with abrupt p-type diffusions. The modulation transfer fu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f4c0645b7fc4e1da60dc96f1c5e0c7cb
https://doi.org/10.1007/s11664-015-3701-0
https://doi.org/10.1007/s11664-015-3701-0
Autor:
Adam R. Wichman, Lawrence E. Larson
Publikováno v:
2017 90th ARFTG Microwave Measurement Symposium (ARFTG).
We demonstrate a time-domain, spread-spectrum technique that measures lowpass-equivalent Volterra coefficients for weakly nonlinear RF systems. The methodology provides robust coefficient estimates at test signal amplitudes well below the operating s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::64fce3f5e24e6629961644db3f3a5d34
https://doi.org/10.1109/arftg.2017.8255881
https://doi.org/10.1109/arftg.2017.8255881
Autor:
Eric J. Adles, Jean Kalkavage, Jonathan Klamkin, Adam R. Wichman, Brandon Isaac, Thomas R. Clark, Yuan Liu
Publikováno v:
2017 IEEE MTT-S International Microwave Symposium (IMS).
An optical ring resonator (ORR) based integrated optical beamforming network (OBFN) for a W-band millimeter wave phased array antenna is reported. The delay response of a 3-ORR delay line is optimized and dynamic tuning ranges of 208.7 ps and 172.4 p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::daac94c6b12004542dacaa4f87c54779
https://doi.org/10.1109/mwsym.2017.8058590
https://doi.org/10.1109/mwsym.2017.8058590
Autor:
Thomas R. Clark, Jean Kalkavage, Brandon Isaac, Eric J. Adles, Jonathan Klamkin, Yuan Liu, Adam R. Wichman, Fengqiao Sang
Publikováno v:
Advanced Photonics 2017 (IPR, NOMA, Sensors, Networks, SPPCom, PS).
The delay response and sharing topology of a 3-optical-ring-resonator based optical beamforming network were experimentally studied and optimized. Eye diagrams were measured to evaluate the signal degradation imposed by the chip.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3c20df0f27d81bcaa5ad3a3cd2d09faf
https://doi.org/10.1364/iprsn.2017.iw2a.2
https://doi.org/10.1364/iprsn.2017.iw2a.2