Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Heiko J. Unold"'
Autor:
Krassimir Panajotov, Heiko J. Unold, M.A. Arteaga, J.M. Ostermann, Hugo Thienpont, Rainer Michalzik
Publikováno v:
IEEE Journal of Quantum Electronics. 42:102-107
The effect of isotropic optical feedback from an extremely short external cavity on the emission properties of vertical-cavity surface-emitting lasers (VCSELs) is experimentally investigated. When changing the external cavity length a modulation of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ce067ee2589a1e89dc3a8a028ff834e2
https://doi.org/10.1109/jqe.2005.861623
https://doi.org/10.1109/jqe.2005.861623
Autor:
Rainer Michalzik, Hugo Thienpont, Heiko J. Unold, Krassimir Panajotov, J.M. Ostermann, M.A. Arteaga
Publikováno v:
IEEE Journal of Quantum Electronics. 42:89-101
A two modes rate equation model for vertical-cavity surface-emitting lasers (VCSELs) subject to optical feedback from an extremely short external cavity (ESEC) is presented. By making use of it we develop a map of bistability to investigate the param
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::59450f50d1ea3b8e7740f13ad9d7d03b
https://doi.org/10.1109/jqe.2005.861622
https://doi.org/10.1109/jqe.2005.861622
Autor:
Heiko J. Unold, Rachel Grange, A. Aschwanden, D. Ebling, Emilio Gini, Dirk Lorenser, Deran J. Maas, Ursula Keller, Ruediger Paschotta
Publikováno v:
Applied Physics B, 79 (8)
Applied Physics B, 79 (8)
ISSN:0946-2171
ISSN:1432-0649
ISSN:0721-7269
ISSN:0340-3793
ISSN:0946-2171
ISSN:1432-0649
ISSN:0721-7269
ISSN:0340-3793
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9dd3adfd24d8767230d8128ecf27b661
https://doi.org/10.1007/s00340-004-1675-3
https://doi.org/10.1007/s00340-004-1675-3
Autor:
J. Maehnss, Karl Joachim Ebeling, Gian Paolo Bava, Pierluigi Debernardi, Rainer Michalzik, Heiko J. Unold
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics. 9:1394-1404
Polarization control in vertical-cavity surface-emitting lasers (VCSELs) has attracted a lot of interest and different techniques have been proposed to achieve it. Among them, one of the most attractive relies on slight modifications of existing and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3b256ef768cd7905e9edbe438db3ec2f
https://doi.org/10.1109/jstqe.2003.819487
https://doi.org/10.1109/jstqe.2003.819487
Autor:
Karl Joachim Ebeling, J. Joos, D. Wiedenmann, Martin Grabherr, Roger King, M. Kicherer, Heiko J. Unold, I. Ecker, R. Jager, F. Mederer
Publikováno v:
IEEE Transactions on Advanced Packaging. 24:442-449
High-bandwidth single-mode selectively oxidized vertical-cavity surface-emitting laser (VCSEL) arrays operate at 980 nm or 850 nm emission wavelength for substrate or epitaxial side emission. Coplanar feeding lines and polyimide passivation are used
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f7dc6f053515fad1ae3d0e33096f34ba
https://doi.org/10.1109/6040.982827
https://doi.org/10.1109/6040.982827
Autor:
R. Jager, Heiko J. Unold, Martin Grabherr, Rainer Michalzik, Karl Joachim Ebeling, Safwat W. Z. Mahmoud
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics. 7:386-392
The effect of mode-profile specific etching of the top layer in selectively oxidized vertical-cavity surface-emitting laser (VCSEL) structures at 850-nm emission wavelength is examined. For high reproducibility, a self-aligned etching technique is de
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a7caa9aa60bb70fa0cc582def3c5d28
https://doi.org/10.1109/2944.954155
https://doi.org/10.1109/2944.954155
Autor:
Heiko J. Unold, R. Jager, Michael W. Miller, Karl Joachim Ebeling, U. Martin, Martin Grabherr, Rainer Michalzik
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics. 5:495-502
We report on vertical-cavity surface-emitting lasers (VCSELs) and laser arrays providing high output powers in the 980-nm wavelength regime. Extensive investigations on size scaling behavior of single top- and bottom-emitting devices concerning funda
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::45a707b2a498b17ceae2c0c3b2495476
https://doi.org/10.1109/2944.788411
https://doi.org/10.1109/2944.788411
Autor:
J.M. Ostermann, Miren Camarena, Mikel Arizaleta, Heiko J. Unold, Rainer Michalzik, Krassimir Panajotov, Hugo Thienpont
Publikováno v:
Applied Physics Letters. 84:2763-2765
We experimentally investigate the spectral and polarization properties of vertical-cavity surface-emitting lasers (VCSELs) subject to polarization insensitive optical feedback from an extremely short external cavity (few microns) and find that the wa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::04891f963ba9d11b9bdbdb81fae2c899
https://doi.org/10.1063/1.1690468
https://doi.org/10.1063/1.1690468
Autor:
Rainer Michalzik, Heiko J. Unold, Safwat W. Z. Mahmoud, M. Kicherer, Karl Joachim Ebeling, D. Wiedenmann, R. Jager
Publikováno v:
IEEE Photonics Technology Letters. 13:1152-1154
Data transmission experiments with single-mode as well as multimode 850-nm vertical-cavity surface-emitting lasers (VCSELs) are carried out from a near-field point of view. Special attention is paid to important quantities like on/off-ratio and bit e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4068782d888503713162e52a5db02e52
https://doi.org/10.1109/68.959347
https://doi.org/10.1109/68.959347
Autor:
S. Lehmacher, E. Griese, Karl Joachim Ebeling, R. Jager, A. Neyer, Rainer Michalzik, F. Mederer, Heiko J. Unold
Publikováno v:
IEEE Photonics Technology Letters. 13:1032-1034
GaAs quantum-well (QW)-based vertical-cavity surface-emitting lasers (VCSELs) at 855-nm emission wavelength are investigated for intraboard polymer waveguide links. We report a 3-Gb/s pseudorandom bit sequence (PRES) nonreturn-to-zero (NRZ) data tran
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::830dbe1d237d07c54ece48ca750ba937
https://doi.org/10.1109/68.942684
https://doi.org/10.1109/68.942684