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Optical code-division multiple-access coding architecture with 2n prime-sequence codes 具有2n个素数序列码的光码分多址编码体系
1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cthi3
W. Kwong, Jianguo Zhang, Guu-chang Yang
{"title":"Optical code-division multiple-access coding architecture with 2n prime-sequence codes","authors":"W. Kwong, Jianguo Zhang, Guu-chang Yang","doi":"10.1364/cleo_europe.1994.cthi3","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cthi3","url":null,"abstract":"Recent study1 shows that the performance of an optical code-division multipleaccess (CDMA) network cannot be evaluated by only considering the correlation properties of the selected optical pseudo-orthogonal codes.2,3 The coding architecture (i.e., the structures of the optical encoders and decoders) is another important factor to consider, since it affects the power budget and feasibility of the system. As a result, \"tunable prime\" and \"modified 2\u0000 n\u0000 \" coding architectures, respectively, for the prime-sequence and 2\u0000 n\u0000 codes have been proposed to improve the power-efficiency.1,4 Recently, \"2\u0000 n\u0000 primesequence\" codes, a collection of symmetric binary sequences with weight 2\u0000 n\u0000 , have been introduced and pose the pseudo-orthogonal and algebraic properties of the original prime-sequence codes.5 To effectively utilize these codes, a novel coding architecture, which consists of a \"modified\" tunable prime encoder and a 2\u0000 n\u0000 decoder, is proposed to substantially reduce the power loss, cost, and complexity of the systems using optical CDMA.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127374988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Monolithically integrated cavity mode-locked two-segment semiconductor lasers at 1.5 μm 波长为1.5 μm的单片集成腔锁模双段半导体激光器
1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cwo4
D. Baums, E. Lach, M. Schilling, K. Daub, W. Idler, E. Zielinski, K. Wünstel
{"title":"Monolithically integrated cavity mode-locked two-segment semiconductor lasers at 1.5 μm","authors":"D. Baums, E. Lach, M. Schilling, K. Daub, W. Idler, E. Zielinski, K. Wünstel","doi":"10.1364/cleo_europe.1994.cwo4","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cwo4","url":null,"abstract":"We report on mode-locking of monolithic cavity fully active two-segment lasers at 1.5 μm and frequencies around 20 GHz. The lasers need very low cw threshold current and modulation power. Optical pulses shorter than 16 ps are observed.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126843242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spectral selective (λ. = 1.06 µm) infrared detectors and quadrants 光谱选择性(λ)= 1.06µm)红外探测器和象限
1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cthi57
V. Dorogan, A. Snigur, V. Brinzari, V. Kosyak, G. Korotchenkov
{"title":"Spectral selective (λ. = 1.06 µm) infrared detectors and quadrants","authors":"V. Dorogan, A. Snigur, V. Brinzari, V. Kosyak, G. Korotchenkov","doi":"10.1364/cleo_europe.1994.cthi57","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cthi57","url":null,"abstract":"In this paper were examined the results of a scientific investigation, which direct the research of selective photocells with sensitivity in the region 1.06 µm. At the same time we solved the problem of creation for both the quadrants for optical orientation in the air-space and photocells with low dark current and little capacity, which can fulfill the part of IR photodetectors with high detected ability.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126591260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Laser cutting of aluminium alloys 铝合金激光切割
1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.ctha7
B. Dabezies, C. Alarcon
{"title":"Laser cutting of aluminium alloys","authors":"B. Dabezies, C. Alarcon","doi":"10.1364/cleo_europe.1994.ctha7","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.ctha7","url":null,"abstract":"In the case of rail transportation, one of the great challenges for the future is to improve the mass capacity without increasing the weight of the vehicles. One of the solutions is to introduce, at the place of steel, aluminium alloys. In this case, the first step is to show the capability of the high productive cutting setup, such as lasers, to machine aluminium plates.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121528168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The effect of 1.5 mm cascading on 3 mm er3+ laser emission 1.5 mm级联对3mm er3+激光发射的影响
1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.ctuk75
V. Lupei, S. Georgescu, S. Grecu
{"title":"The effect of 1.5 mm cascading on 3 mm er3+ laser emission","authors":"V. Lupei, S. Georgescu, S. Grecu","doi":"10.1364/cleo_europe.1994.ctuk75","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.ctuk75","url":null,"abstract":"Laser emission in various regimes was obtained at room temperature in the three-micron range on Er3+ transition 4I11/2→4i13/2, despite a much larger lifetime of the terminal level. Various mechanisms have been considered in order to obtain efficient depopulation of 4I13/2 necessary to avoid the self-saturation of the laser emission: excited state absorption of the pump radiation from the terminal level,1 energy transfer to impurities,2 up-conver-sion,3 and, most recently, cascading with 1.5µm emission from 4I13/2 to the ground level 4I15/2,4 While the up-conversion is an internal mechanism of the system of Er3+ ions and a high Er concentration is necessary in order to be effective, all the other mechanisms require additional external conditions and could act at any Er concentration.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122059581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Diffraction coupling of CO2-lasers co2激光器的衍射耦合
1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cff4
K. Schröder, A. Müller, D. Schuöcker
{"title":"Diffraction coupling of CO2-lasers","authors":"K. Schröder, A. Müller, D. Schuöcker","doi":"10.1364/cleo_europe.1994.cff4","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cff4","url":null,"abstract":"Phase-locking of two slow-flow CO2-lasers, each providing an output power of 20 W, has been investigated. The active media are situated in parallel in a distance of 55 cm to each other. Both resonators are folded twice by plane mirrors to make the two beams propagate in parallel close to each other. The laser radiation is extracted by a common semitransparent output coupler. As only reflective optics is used (except for the output coupler) this concept is also suitable for high power lasers. When the segmented folding mirror is replaced by a parabolic mirror more than two lasers can be coupled.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125665635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental and numerical investigations of two-dimensional "Antiresonant Reflecting Optical Waveguides'' (ARROWs) based on AlGaAs/GaAs 基于AlGaAs/GaAs的二维“反谐振反射光波导”(箭头)的实验和数值研究
1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cthd3
Roland Freye, T. Delonge, P. Bönsch, H. Fouckhardt
{"title":"Experimental and numerical investigations of two-dimensional \"Antiresonant Reflecting Optical Waveguides'' (ARROWs) based on AlGaAs/GaAs","authors":"Roland Freye, T. Delonge, P. Bönsch, H. Fouckhardt","doi":"10.1364/cleo_europe.1994.cthd3","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cthd3","url":null,"abstract":"The device concept of a two-dimensional ARROW and its technological realization is reported. ARROWs belong to the class of leaky Bragg waveguides in integrated optoelectronics.1 Despite core sizes of dc = 5 µm quasi-monomode waveguiding is achieved by reflection at Bragg layers. These layers operate in antiresonance for the fundamental mode, i.e., due to its optical path length the attenuation coefficient is rather small (typically α < 0.5 dB/ cm) for this mode only compared to every other leaky mode (typically α > 20 dB/cm). The device exhibits antiresonant guiding in both cross sectional dimensions, so the ARROW fundamental mode profile is similar in shape and size to that of a monomode glass fiber. Hence, efficient ARROW based fiber-chip coupling can be achieved with coupling coefficients of η ≃ 95%. We used AlGaAs/ GaAs as an exemplary material system.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128401087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-repetition-rate β barium borate visible range femtosecond optical parametric oscillator 高重复率β硼酸钡可见飞秒光学参量振荡器
1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cwa2
T. Driscoll, G. Gale, F. Hache
{"title":"High-repetition-rate β barium borate visible range femtosecond optical parametric oscillator","authors":"T. Driscoll, G. Gale, F. Hache","doi":"10.1364/cleo_europe.1994.cwa2","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cwa2","url":null,"abstract":"High-repetition-rate femtosecond optical parametric oscillators (OPO) are potentially very useful devices in many areas of science due to their wide tunability, relatively short pulse duration, and automatic synchronisation with the pump laser, which can allow, for example, sum and difference frequency generation, further extending the range of tunability of the OPO. To date, continuous wave fem­tosecond OPOs have mostly employed KTP,1–3 mainly pumped by the fundamental wavelengths of a Ti:sapphire laser. These sources operate in the near- to mid-infrared, although intracavity frequency doubling of a KTP OPO has been described recently.4","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115117706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nd:LaF3 crystal lasers: cw, Q-switched operation and upconversion fluorescence Nd:LaF3晶体激光器:连续波、调q操作和上转换荧光
1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cma5
Yuan Shi, O. Poulsen, H. Haugen
{"title":"Nd:LaF3 crystal lasers: cw, Q-switched operation and upconversion fluorescence","authors":"Yuan Shi, O. Poulsen, H. Haugen","doi":"10.1364/cleo_europe.1994.cma5","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cma5","url":null,"abstract":"There has been a great interest and extensive research in diode laser-pumped solid-state lasers in the past decade. Nd:LaF3 crystals have a long lifetime and broad absorption feature1 compared to Nd:YAG and Nd:YLF crystals. These are advantages for Q-switched laser operation. We report a Nd:LaF3 laser pumped by a 788-nm Ti:sapphire laser in cw and Q-switched operation. Upconversion fluorescence and the corresponding mechanisms are analyzed.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131651769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of modulation and fringe velocity on the photorefractive response with moving gratings in Bi12SiO20 调制和条纹速度对Bi12SiO20中移动光栅光折变响应的影响
1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.ctuh4
G. Brost, K. Magde, C. Cartwright, W. Gillespie, Zhao-qi Wang
{"title":"Influence of modulation and fringe velocity on the photorefractive response with moving gratings in Bi12SiO20","authors":"G. Brost, K. Magde, C. Cartwright, W. Gillespie, Zhao-qi Wang","doi":"10.1364/cleo_europe.1994.ctuh4","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.ctuh4","url":null,"abstract":"Hologram recording by a moving interference pattern in a dc-electric field can provide large enhancements in the photorefractive effect in crystals with long drift lengths, such as semiconductors and the sillenites. The theory of Refregier et al.1 predicts the photorefractive response, but only in the limit of small modulation. In practice, most experimental conditions cannot be adequately described by the linearized theory. The correction function used by Refregier et al.1 describes the effect of modulation, but only for two-wave mixing at the optimum velocity. Au and Solymar2 have demonstrated numerically a complicated photorefractive response. In this paper we provide more detailed numerical analysis, and for the first time, experimental characterization of the photorefractive response, including both diffraction and energy transfer, in BSO as function of modulation index and fringe velocity.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132933294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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