Nonlinear Guided Waves and Their Applications最新文献

{"title":"Three channel directional coupler with an optically induced grating","authors":"E. Weinert-Rączka","doi":"10.1364/nlgw.1998.nthe.15","DOIUrl":"https://doi.org/10.1364/nlgw.1998.nthe.15","url":null,"abstract":"Directional couplers are important elements of the integrated optics systems. The efficient power exchange between waveguides in the directional coupler occurs when the propagation constants of their guided modes are equal. The coupling between different waveguides can be obtained with the help of a grating formed by periodic changes of the refractive index along the coupler [1-5]. The grating constant K=2π/Λ (where Λ is the length of the grating period) should be equal to the difference between waveguides modes propagation constants (K=βA−βB). The gratings in the traditional grating-assisted-couplers (GAC) are usually formed during the fabrication processes and have constant, immutable parameters, what limits the operation of the coupler to one, strictly defined frequency. An optically induced grating proposed in [6] was formed by the interference of two counter-propagating external beams in a nonlinear layer separating two slab waveguides. Parameters of such grating depend on the external waves properties and can be varied during the work of the device. In particular the grating constant can be tuned to the guided modes propagation constants difference by changing the external waves frequencies or propagation directions.","PeriodicalId":262564,"journal":{"name":"Nonlinear Guided Waves and Their Applications","volume":"12 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":"114378609","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":"Vertical coupler device design for reduced-power optical switching using nonlinearity mismatch","authors":"R. Geatches, S. Dewar, R. Penty","doi":"10.1364/nlgw.1996.fd.21","DOIUrl":"https://doi.org/10.1364/nlgw.1996.fd.21","url":null,"abstract":"The potential of nonlinear directional couplers (NLDCs) as the basis for all-optical switching devices has been studied extensively [1]. The mode of operation of an NLDC as an all-optical switch is based on the optical intensity dependence of the nonlinear refractive indices of the two waveguiding regions of the coupler, where the modal propagation contants (β) of the waveguides are matched at low powers and mismatched at high powers. When the waveguides are in close proximity, the light in the input waveguide will couple to the other waveguide in a coupling distance Lc at low powers, but at high powers the waveguides will decouple and the light will remain in the input waveguide. The power at which the light is equally split between the waveguides is defined as the critical power, Pc [2]. Proposals to reduce Pc in fibers NLDCs have included asymmetric designs, matched gain in the input waveguide to loss in the other [3], and non-identical nonlinear refractive indices in the two waveguides [4], However, for true optoelectronic integration it is desirable to design NLDCs using semiconductor materials. Our previous studies of semiconductor NLDCs for the first time have focussed on the enhancement of asymmetry and realistic geometries for matching gain to loss [5]. This has been demonstrated by the use of vertical design configurations with a quasi- planar-waveguide coupled to a rib-waveguide (see figure 1). Such designs have a high degree of geometric asymmetry, and because the waveguides are in separate planes the doping and biasing requirements needed for inducing gain in only one waveguide are experimentally realisable. Furthermore, the separation of the waveguides is only limited by the epitaxial fabrication process. This indicates that the waveguide separation in a vertical NLDC can be much smaller than that for a conventional two-rib horizontal design, thereby further enhancing the predicted characteristics of the design by minimizing Lc. In this paper, we extend these studies to the design of vertical NLDC geometries with nonlinear refractive index mismatch between the two waveguides. This is achieved by having the two waveguiding layers made of different semiconductor materials. The structures have been designed and optimized using two computational modelling techniques, the Spectral Index method and Coupled Mode Theory. In this paper we report a fesibility study of the predicted advantages of such a design and the possible reductions in Pc.","PeriodicalId":262564,"journal":{"name":"Nonlinear Guided Waves and Their Applications","volume":"3 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":"125423898","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":"Average dynamics of the optical soliton in communication lines with dispersion management: Analytical results","authors":"S. Turitsyn, A. Aceves, C. Jones, V. Zharnitsky","doi":"10.1103/PHYSREVE.58.R48","DOIUrl":"https://doi.org/10.1103/PHYSREVE.58.R48","url":null,"abstract":"Applying asymptotic methods we present an analytical description of the\u0000 slow dynamics of breathing pulses propagating in fiber links with\u0000 dispersion management. We derive asymptotic averaged quantities which\u0000 characterize the stable pulse propagation. For the practically\u0000 important case of local high dispersion we have found fixed points\u0000 describing dispersion-managed solitons.","PeriodicalId":262564,"journal":{"name":"Nonlinear Guided Waves and Their Applications","volume":"94 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":"125981721","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":"Phase-matched second-harmonic generation in KNbO3 channel waveguides","authors":"D. Fluck, T. Pliška, P. Günter, L. Beckers, C. Buchal","doi":"10.1364/nlgw.1996.fd.19","DOIUrl":"https://doi.org/10.1364/nlgw.1996.fd.19","url":null,"abstract":"Frequency doubling of near-infrared lasers in channel waveguides offers the potential of building robust, compact and reliable blue lasers. KNbO3 is one of the candidate materials for high efficiency frequency doubling of AIGaAs and InGaAs laser diodes and of diode-pumped solid-state lasers, e.g. Nd:YAG and Nd:YVO4 lasers, into the blue spectral range thanks to its large nonlinear optical coefficients and its favourable phase-matching (PM) conditions1.","PeriodicalId":262564,"journal":{"name":"Nonlinear Guided Waves and Their Applications","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":"124333131","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":"Ultrashort soliton propagation in the vicinity of a two-photon resonance","authors":"M. Santagiustina, E. Wright","doi":"10.1364/nlgw.1995.pd4","DOIUrl":"https://doi.org/10.1364/nlgw.1995.pd4","url":null,"abstract":"A new formalism to describe pulse propagation in the vicinity of a two-photon resonance is applied to GaAs-doped glass waveguides. Ultrashort soliton propagation is predicted.","PeriodicalId":262564,"journal":{"name":"Nonlinear Guided Waves and Their Applications","volume":"226 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":"131421747","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":"Periodic conjugation of optical solitons","authors":"C. Goedde, W. Kath, Premjeet Kumar","doi":"10.1364/nlgw.1995.nfb3","DOIUrl":"https://doi.org/10.1364/nlgw.1995.nfb3","url":null,"abstract":"Optical phase conjugation of a linear pulse to compensate for the effects of even-order dispersion was first proposed by Yariv et al.1 and recently demonstrated.2 If a pulse is conjugated at the fiber midpoint, subsequent propagation reverses the effects of even-order dispersion. Recently, Forysiak and Doran3 showed that mid-point optical phase conjugation can be used in optical soliton transmission systems to compensate for soliton-soliton interactions and Gordon-Haus jitter.","PeriodicalId":262564,"journal":{"name":"Nonlinear Guided Waves and Their Applications","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":"126481340","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":"Soliton Jitter Suppression by a Copropogating Support Structure","authors":"A. Shipulin, G. Onishchukov, B. Malomed","doi":"10.1364/nlgw.1996.sad.9","DOIUrl":"https://doi.org/10.1364/nlgw.1996.sad.9","url":null,"abstract":"The Gordon-Haus (GH) jitter is one of the most serious problems in designing soliton-based optical communication networks [?]. Different ways to suppress the jitter have been proposed [?], [?]. Nevertheless, search for alternative means allowing to stabilize the long-haul soliton transmission against the random jitter remains an important problem.","PeriodicalId":262564,"journal":{"name":"Nonlinear Guided Waves and Their Applications","volume":"112 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":"122320808","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":"Power Controlled Ultrafast Wavelength Shifting","authors":"A. Villeneuve, J. Aitchison","doi":"10.1364/nlgw.1996.saa.5","DOIUrl":"https://doi.org/10.1364/nlgw.1996.saa.5","url":null,"abstract":"Future optical communication system will probably be a mixture of wavelength division multiplexing (WDM) and optical time domain multiplexing (OTDM). It was shown recently that AlGaAs used at photon energies below the half-band gap is capable of performing OTDM functions[1]. In an OTDM system, signals are alloted different time slots, while in a WDM system, more than one wavelength are used to carry the signals. Hence there is a need to have wavelength shifting components to route signals. Furthermore, if OTDM and WDM are combined, the wavelength shifting will have to be ultrafast.","PeriodicalId":262564,"journal":{"name":"Nonlinear Guided Waves and Their Applications","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":"114989787","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":"Breathing spatial solitons in quadratic media: An inverse scattering transform approach","authors":"E. Ibragimov, A. Struthers","doi":"10.1364/nlgw.1998.nsnps.p4","DOIUrl":"https://doi.org/10.1364/nlgw.1998.nsnps.p4","url":null,"abstract":"Well-known second-harmonic bright spatial solitons consist of both fundamentals and harmonic, locked together in space. The resulting coupled waves propagate without spatial diffraction and can eliminate mutual walk-off. We show explicit analytical solutions with behavior similar to that of cascaded solitons.","PeriodicalId":262564,"journal":{"name":"Nonlinear Guided Waves and Their Applications","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":"129972125","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":"Steering of Multidimensional Solitons in Nonlinear Fiber Arrays","authors":"A. Aceves, C. de Angelis, G. Luther, A. Rubenchik, S. Turitsyn","doi":"10.1364/nlgw.1995.nsab1","DOIUrl":"https://doi.org/10.1364/nlgw.1995.nsab1","url":null,"abstract":"Passive or active waveguides coupled to form an array have many applications [1, 2]. Because the output characteristics can be changed by tuning the input power, a waveguide array based on optical fibers called the Nonlinear Fiber Array (NFA) may permit ultrafast, all-optical switching. Such a device was first proposed in Ref. [3]. Recently it was shown that when group velocity dispersion becomes important in NFA’s, nonlinearity, dispersion, and the discrete effect of linear coupling along the array balance permitting the stable propagation of multidimensional light bullets [4]. In this paper we show that these beams can be exploited in NFA’s for all-optical-information-processing. To steer a signal on the dispersive NFA, phase shifts can be introduced to initiate translation along the array of fibers. As the light energy propagates, a quasi-collapse phenomenon begins to localize it. Once the energy is localized over a few fibers, its translation along the array is stopped. The output fiber is selected by the combination of launch speed, which is a function of the gradient of the phase shift along the array, and localization rate, which is a function of the initial power.","PeriodicalId":262564,"journal":{"name":"Nonlinear Guided Waves and Their Applications","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":"130881643","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}