Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003.最新文献

{"title":"Analysis of the shape rod dependence in finite-size two-dimensional photonic crystals","authors":"L. Illyashenko, T. Benson, P. Sewell","doi":"10.1109/ICTON.2003.1264629","DOIUrl":"https://doi.org/10.1109/ICTON.2003.1264629","url":null,"abstract":"The investigation of the propagation characteristics of photonic bandgap structure is provided. Method of boundary integral equations combined with method of analytical regularization and conformal mapping technique is used to study structures with triangular lattice of dielectric rods of arbitrary polygonal cross-section. In particular, it is examined how the changing of the rods shape affects the transmission characteristics. Results indicate a strong dependence of propagation characteristics on the rod shape with increasing the normalized frequency parameter and decreasing the number of angles in cross-section contour of rods.","PeriodicalId":272700,"journal":{"name":"Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003.","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124891111","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}

{"title":"Supercontinuum generation in a photonic crystal fibre using picosecond pulses at 1550 nm","authors":"P. Andersen, C. Peucheret, K. Hilligsøe, K. Berg, K. Hansen, P. Jeppesen","doi":"10.1109/ICTON.2003.1264581","DOIUrl":"https://doi.org/10.1109/ICTON.2003.1264581","url":null,"abstract":"Supercontinuum (SC) generation is demonstrated in a photonic crystal fibre (PCF) at 1550 nm with pulse widths of 0.3 to 2.5 ps. Subsequent band-pass filtering of the generated SC spectrum enables the realisation of an optical clock frequency translator continuously tunable up to the L-band.","PeriodicalId":272700,"journal":{"name":"Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003.","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124937605","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}

{"title":"Etched lattice effects in edge-emitters and VCSELs - PBG effects or not?","authors":"J. Rorison","doi":"10.1109/ICTON.2003.1264608","DOIUrl":"https://doi.org/10.1109/ICTON.2003.1264608","url":null,"abstract":"Summary form only given. There has been a significant amount of study world-wide on etching PBG structures into both VCSELs and edge-emitting lasers. The results of experiments etching PBGs structures into the DBRs of GaAs-based proton-implanted and oxide confined VCSELs using focussed ion beam etching (FIBE) are presented. The results of etching a small section of a PBG lattice on either side of the ridge waveguide in an edge-emitting laser are also be presented. A side mode suppression ratio improvement of 40dB has been observed through this technique. This has been modelled using a finite difference time domain model to understand if this is indeed a PBG effect.","PeriodicalId":272700,"journal":{"name":"Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003.","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121041105","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}

{"title":"Modelling and measurement of 2D photonic crystals with tapered hole profiles","authors":"M. Cryan, M. Hill, R. Varrazza, M.M. Ronda, I.J.C. Raddock, S. Yu, C. Railton, J. Rorison","doi":"10.1109/ICTON.2003.1264651","DOIUrl":"https://doi.org/10.1109/ICTON.2003.1264651","url":null,"abstract":"2 and 3D Finite Difference Time Domain (FDTD) simulations and measurements of a hexagonal lattice 2D photonic crystal with holes having taper angles in the region of 3 to 7 degrees are performed. The results show a smoothing of band edges and increased losses. Reasonably good agreement between measured and modelled results is obtained.","PeriodicalId":272700,"journal":{"name":"Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003.","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121059185","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}

{"title":"Analysis of waveguide junctions and sharp bends with general anisotropic material by using orthogonal propagating waves","authors":"R. Pregla","doi":"10.1109/ICTON.2003.1264592","DOIUrl":"https://doi.org/10.1109/ICTON.2003.1264592","url":null,"abstract":"An analysis procedure based on the Method of Lines for general waveguide junctions which also includes sharp bends is presented in this contribution. Crossed discretization lines are used. The required equations are developed from generalized transmission line equations for general anisotropic material.","PeriodicalId":272700,"journal":{"name":"Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125475625","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}

{"title":"Physics and design of low noise avalanche photodiodes - LEOS distinguished lecture 2003-2004","authors":"J. David","doi":"10.1109/ICTON.2003.1263173","DOIUrl":"https://doi.org/10.1109/ICTON.2003.1263173","url":null,"abstract":"Summary form only given. Avalanche photodiodes (APDs) are used in many applications when conventional unity gain photodiodes cannot provide enough sensitivity and the extra amplification provided by the impact ionization process gives it an advantage. Unfortunately this amplification or gain of the incoming optical signal is always accompanied by some 'excess noise' due to the stochastic nature of the ionization process and this sets a limit to the maximum useful gain. Early work by McIntyre showed that the excess noise depended on the ratio of hole ionization coefficient (/spl beta/) to electron ionization coefficient (/spl alpha/). /spl alpha/ and /spl beta/ are semiconductor material dependent and unfortunately most III-V materials have /spl alpha//spl ap//spl beta/, giving rise to relatively high excess noise. Since the ionization coefficients depend on the details of the band structure it is extremely difficult to modify, even using band-gap engineering techniques such as superlattices or MQWs. In recent years, work done at the University of Sheffield and the University of Texas (Austin) has shown that low excess noise can be obtained in homojunction structures simply by utilising thin avalanching regions. Experimental results show that contrary to conventional theory, the excess noise actually decreases as the avalanching width reduces. This behaviour has now been observed in virtually all semiconductor materials including GaAs, AlGaAs, InP, AlInAs and even silicon. The reason for this anomalous behaviour in thin devices is due to the 'dead space' (d), defined as the minimum distance a carrier has to travel before it is in equilibrium with the electric field. Conventional models of the ionization process ignored. This assumption is generally valid in devices with thick avalanching widths in which the dead space distance, d, is relatively small compared to the avalanching width, w. In thin avalanching width structures, d becomes a significant fraction of w and the ionizing process becomes more deterministic, reducing the stochastic variations that give rise to the excess noise. This talk will review these results and show that in addition to reducing the excess noise, thin avalanching widths offer APDs with other advantages such as lower operating voltages, better temperature stability and predicted enhanced speed of operation.","PeriodicalId":272700,"journal":{"name":"Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003.","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127736339","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}

{"title":"Wide-angle optical wave Bragg scattering at photonic band-gap structures","authors":"N. M. Ushakov","doi":"10.1109/ICTON.2003.1264634","DOIUrl":"https://doi.org/10.1109/ICTON.2003.1264634","url":null,"abstract":"The general principles of wide-angle optical wave Bragg scattering at photonic band gap structures in form of photorefractive holograms are offered. It was shown that ideal beam steering at the Bragg angle is possible when the condition /spl theta//sub 0/ = /spl theta//sub B/ /spl plusmn/ /spl phi/ = const is met for each grating vector K/sub G/, in which /spl theta//sub 0/ is angle of incidence of the optical wave, /spl phi/ is the inclination of the grating vector, and /spl theta//sub B/ is the Bragg angle. In contrast to acoustical waves photorefractive holograms as fan pattern offers practically unlimited of wide-angle optical-wave scattering and super high efficiency of modulation equal to 1.","PeriodicalId":272700,"journal":{"name":"Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128794893","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}

{"title":"Amorphous GaN: Optoelectronic properties and device potential","authors":"H. Trodahl, B. Ruck, A. Koo, U. Lanke, A. Bittar","doi":"10.1109/ICTON.2003.1264615","DOIUrl":"https://doi.org/10.1109/ICTON.2003.1264615","url":null,"abstract":"This paper describes the preparation of an amorphous form of hetero-polar tetrahedrally bonded GaN by ion-assisted deposition. The structure, including composition and bonding configurations, has been subjected to thorough investigation to establish the optimum deposition conditions. The optoelectronic properties of the best films have been measured to evaluate their potential in UV-blue detectors and/or emitters. Currently the best films have shown clear photoconductivity, with sensitivity peaking in the UV, but no useful luminescence has yet been found.","PeriodicalId":272700,"journal":{"name":"Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003.","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116796408","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}

{"title":"Birefringent microstructured fibers: Properties and applications","authors":"H. Ludvigsen, G. Genty, M. Lehtonen, T. Ritari, T. Niemi, M. Kaivola","doi":"10.1109/ICTON.2003.1264616","DOIUrl":"https://doi.org/10.1109/ICTON.2003.1264616","url":null,"abstract":"Development of sophisticated techniques for manufacturing microstructured fibers has enabled the production of fibers with precisely controlled structures. For instance, fibers with very low or high birefringence have been demonstrated. We present the status of our work on characterization of the dispersion properties of birefringent microstructured fibers and discuss their use for generation of supercontinuum radiation.","PeriodicalId":272700,"journal":{"name":"Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003.","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124589578","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}

{"title":"Symmetry-selecting gratings and their applications","authors":"S. Tomljenovic-Hanic","doi":"10.1109/ICTON.2003.1263181","DOIUrl":"https://doi.org/10.1109/ICTON.2003.1263181","url":null,"abstract":"The basic idea behind a symmetry-selecting grating is to replace a grating written over the entire core cross-section of a waveguide with a grating that is written only over a part of the core. Gratings with a particular symmetry in the horizontal direction can be symmetry-selective, reflecting the modes with that particular symmetry. Here a new type of grating-the fractional core gratings-is proposed and their potential applications to single-, two- and three-wavelength add/drop wavelength filters is discussed and their performance quantified.","PeriodicalId":272700,"journal":{"name":"Proceedings of 2003 5th International Conference on Transparent Optical Networks, 2003.","volume":"276 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121299581","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}