Pub Date : 2007-07-01DOI: 10.1109/ICTON.2007.4296246
A. Nosich, E. Smotrova, P. Sewell, T. Benson
A review of the recently proposed approach to the analysis of lasing as a linear eigenproblem for the Maxwell equations with exact boundary and radiation conditions is presented. It is based on the assumption that the cavity contains an active region characterised by the "active" imaginary part of refractive index. This enables one to quantify the thresholds of lasing, for each of the cavity modes, and to use the tailoring of the shape of the active region as an instrument for lowering the thresholds.
{"title":"Lasing in Open Microcavities with Active Regions as a Linear Electromagnetic Eigenproblem","authors":"A. Nosich, E. Smotrova, P. Sewell, T. Benson","doi":"10.1109/ICTON.2007.4296246","DOIUrl":"https://doi.org/10.1109/ICTON.2007.4296246","url":null,"abstract":"A review of the recently proposed approach to the analysis of lasing as a linear eigenproblem for the Maxwell equations with exact boundary and radiation conditions is presented. It is based on the assumption that the cavity contains an active region characterised by the \"active\" imaginary part of refractive index. This enables one to quantify the thresholds of lasing, for each of the cavity modes, and to use the tailoring of the shape of the active region as an instrument for lowering the thresholds.","PeriodicalId":265478,"journal":{"name":"2007 9th International Conference on Transparent Optical Networks","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129175108","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}
Pub Date : 2007-07-01DOI: 10.1109/ICTON.2007.4296015
Yong-Hee Lee, I. Hwang, Se‐Heon Kim
Two possible structures that enable highly-efficient photon out-coupling from wavelength-scale resonators are to be discussed. Specifically the vertical beaming scheme and the all-fiber coupling scheme are discussed in detail, showing the possibility of high optical coupling efficiency in excess of 80%.
{"title":"Photon Funneling from Ultra-small Photonic Crystal Lasers near Communication Wavelength","authors":"Yong-Hee Lee, I. Hwang, Se‐Heon Kim","doi":"10.1109/ICTON.2007.4296015","DOIUrl":"https://doi.org/10.1109/ICTON.2007.4296015","url":null,"abstract":"Two possible structures that enable highly-efficient photon out-coupling from wavelength-scale resonators are to be discussed. Specifically the vertical beaming scheme and the all-fiber coupling scheme are discussed in detail, showing the possibility of high optical coupling efficiency in excess of 80%.","PeriodicalId":265478,"journal":{"name":"2007 9th International Conference on Transparent Optical Networks","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129237383","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}
Pub Date : 2007-07-01DOI: 10.1109/ICTON.2007.4296374
S. Shinohara, T. Harayama
We study light emission from a stadium-shaped optical cavity by ray and wave descriptions. A remarkable ray-wave correspondence is revealed by investigating phase space distributions that describe how the light is transmitted outside the cavity.
{"title":"Ray-Wave Correspondence in Stadium-Shaped Optical Cavities","authors":"S. Shinohara, T. Harayama","doi":"10.1109/ICTON.2007.4296374","DOIUrl":"https://doi.org/10.1109/ICTON.2007.4296374","url":null,"abstract":"We study light emission from a stadium-shaped optical cavity by ray and wave descriptions. A remarkable ray-wave correspondence is revealed by investigating phase space distributions that describe how the light is transmitted outside the cavity.","PeriodicalId":265478,"journal":{"name":"2007 9th International Conference on Transparent Optical Networks","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123966809","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}
Pub Date : 2007-07-01DOI: 10.1109/ICTON.2007.4296307
R. Nogueira, A. Teixeira, M. Violas, R. Sousa, P. André, T. Silveira, R. Okina, S. Sales
Fiber chromatic dispersion can severely degrade the performance of optical networks at high bit rates. This impairment can be controlled using dispersion compensators. However, in advanced optical networks, changes in the environment surrounding the fiber and/or multi-path topologies need tuneable dispersion compensators with high tuning range and fast tuning times. This paper gives an overview of possible techniques that can be used to control the dispersion in a dynamic way.
{"title":"Tuneable Optical Dispersion Compensators for Dynamic Optical Networks","authors":"R. Nogueira, A. Teixeira, M. Violas, R. Sousa, P. André, T. Silveira, R. Okina, S. Sales","doi":"10.1109/ICTON.2007.4296307","DOIUrl":"https://doi.org/10.1109/ICTON.2007.4296307","url":null,"abstract":"Fiber chromatic dispersion can severely degrade the performance of optical networks at high bit rates. This impairment can be controlled using dispersion compensators. However, in advanced optical networks, changes in the environment surrounding the fiber and/or multi-path topologies need tuneable dispersion compensators with high tuning range and fast tuning times. This paper gives an overview of possible techniques that can be used to control the dispersion in a dynamic way.","PeriodicalId":265478,"journal":{"name":"2007 9th International Conference on Transparent Optical Networks","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123223377","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}
Pub Date : 2007-07-01DOI: 10.1109/ICTON.2007.4296099
A. Ehrhardt
The optical network must be suitable for new services with high quality of service and high availability offered by network operators. Private and business customers demand more and more triple play services. In the access domain the optical fibre will directly reach the buildings to satisfy the customers' demand on data rates and quality of the service with high flexibility and short provisioning time. Customer data rates directly influence on the transmission capacity of the links and require flexibility of the transport network. Classical optical networks in the backbone are based on fixed WDM transmission links with point-to-point configuration. Dense WDM systems (DWDM) for high capacity links coexist with Coarse WDM systems (CWDM) for cost effective links. The link data rate of the WDM channels is either 2.5 Gbit/s or 10 Gbit/s. But the next step of the network migration is the introduction of 40 Gbit/s channels. The 10 Gbit/s links must be suitable for implementation of 40 Gbit/s without any changes of the link design to minimise capex and opex. For more flexibility of the network reconfigurable OADM will be inserted in the links and network nodes. Thus the maximum transparency length can be increased but network operators have to take into account limiting physical effects like PMD, chromatic dispersion and spectral characteristics of the cascaded OADM while extending transmission speed of the channels up to 40 Gbit/s. The transport hierarchy of the network migrates from classical SDH-infrastructure to OTH-infrastructure with completely new features satisfying future network requirements. An automatically switched network supports flexibility and the necessary bandwidth can be provided to the customers on demand.
{"title":"Next Generation Optical Networks and New Services: an Operator's Point of View","authors":"A. Ehrhardt","doi":"10.1109/ICTON.2007.4296099","DOIUrl":"https://doi.org/10.1109/ICTON.2007.4296099","url":null,"abstract":"The optical network must be suitable for new services with high quality of service and high availability offered by network operators. Private and business customers demand more and more triple play services. In the access domain the optical fibre will directly reach the buildings to satisfy the customers' demand on data rates and quality of the service with high flexibility and short provisioning time. Customer data rates directly influence on the transmission capacity of the links and require flexibility of the transport network. Classical optical networks in the backbone are based on fixed WDM transmission links with point-to-point configuration. Dense WDM systems (DWDM) for high capacity links coexist with Coarse WDM systems (CWDM) for cost effective links. The link data rate of the WDM channels is either 2.5 Gbit/s or 10 Gbit/s. But the next step of the network migration is the introduction of 40 Gbit/s channels. The 10 Gbit/s links must be suitable for implementation of 40 Gbit/s without any changes of the link design to minimise capex and opex. For more flexibility of the network reconfigurable OADM will be inserted in the links and network nodes. Thus the maximum transparency length can be increased but network operators have to take into account limiting physical effects like PMD, chromatic dispersion and spectral characteristics of the cascaded OADM while extending transmission speed of the channels up to 40 Gbit/s. The transport hierarchy of the network migrates from classical SDH-infrastructure to OTH-infrastructure with completely new features satisfying future network requirements. An automatically switched network supports flexibility and the necessary bandwidth can be provided to the customers on demand.","PeriodicalId":265478,"journal":{"name":"2007 9th International Conference on Transparent Optical Networks","volume":"363 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116322727","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}
Pub Date : 2007-07-01DOI: 10.1109/ICTON.2007.4296366
S. Sunada, T. Harayama, T. Miyasaka
We study the effect of rotation on resonances of an optical cavity in an accelerated frame of reference. We show that, even when the resonant modes of an optical cavity are wave-chaotic, degenerate resonant frequency of those modes split into different frequencies due to the rotation of the cavity. The frequency difference is proportional to the rotation rate, although the splitting resonant modes are still wave-chaotic, which do not have any corresponding counter-propagating waves as well as ray-dynamical counterparts.
{"title":"Generalized Sagnac Effect in Rotating Optical Cavities","authors":"S. Sunada, T. Harayama, T. Miyasaka","doi":"10.1109/ICTON.2007.4296366","DOIUrl":"https://doi.org/10.1109/ICTON.2007.4296366","url":null,"abstract":"We study the effect of rotation on resonances of an optical cavity in an accelerated frame of reference. We show that, even when the resonant modes of an optical cavity are wave-chaotic, degenerate resonant frequency of those modes split into different frequencies due to the rotation of the cavity. The frequency difference is proportional to the rotation rate, although the splitting resonant modes are still wave-chaotic, which do not have any corresponding counter-propagating waves as well as ray-dynamical counterparts.","PeriodicalId":265478,"journal":{"name":"2007 9th International Conference on Transparent Optical Networks","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114870052","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}
Pub Date : 2007-07-01DOI: 10.1109/ICTON.2007.4296388
Seung-Hyeon Seong, S. Ryu, H. Ko, Jeong-Soo Kim
An external cavity laser (ECL) with a thin film narrow bandpass filter was designed and characterized. The novel ECL structure utilized a narrow bandpass filter whose center wavelength and bandwidth were easily controlled. Moreover, it has an advantage of stable lasing wavelength due to the small variation of filter performance over temperature. The ECL was composed of one side anti-reflection coated laser diode (LD), bandpass filter, and a partial mirror. For single mode operation, the filter was tilted to prohibit reflected light at the filter surface entering the LD waveguide. In this paper, we varied the filter angle and measured performance of the ECL. When the filter was tilted, a single mode operation was observed while optical power decreased. The optimum performance was obtained when the filter angle was 2 degrees, where side mode suppression ratio was 45 dB and optical power was 1.8 mW at 30 mA.
{"title":"Characterization of External Cavity Laser with Thin Film Narrow Bandpass Filter","authors":"Seung-Hyeon Seong, S. Ryu, H. Ko, Jeong-Soo Kim","doi":"10.1109/ICTON.2007.4296388","DOIUrl":"https://doi.org/10.1109/ICTON.2007.4296388","url":null,"abstract":"An external cavity laser (ECL) with a thin film narrow bandpass filter was designed and characterized. The novel ECL structure utilized a narrow bandpass filter whose center wavelength and bandwidth were easily controlled. Moreover, it has an advantage of stable lasing wavelength due to the small variation of filter performance over temperature. The ECL was composed of one side anti-reflection coated laser diode (LD), bandpass filter, and a partial mirror. For single mode operation, the filter was tilted to prohibit reflected light at the filter surface entering the LD waveguide. In this paper, we varied the filter angle and measured performance of the ECL. When the filter was tilted, a single mode operation was observed while optical power decreased. The optimum performance was obtained when the filter angle was 2 degrees, where side mode suppression ratio was 45 dB and optical power was 1.8 mW at 30 mA.","PeriodicalId":265478,"journal":{"name":"2007 9th International Conference on Transparent Optical Networks","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126408345","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}
Pub Date : 2007-07-01DOI: 10.1109/ICTON.2007.4296340
Helder A. Pereira, D. Chaves, C. Bastos-Filho, J. Martins-Filho
We propose a model to consider several physical impairments in optical networks based on the OSNR. Our model considers the dependence of gain and amplified spontaneous emission depletion in optical amplifiers, homodyne crosstalk in optical switches, and four wave mixing in the transmission fibers. We present an application of our model for the evaluation of network performance in terms of blocking probability using a routing and wavelength assignment algorithm. Our results show the impact of each impairment on network performance as a function of device parameters.
{"title":"Noise Penalties Modeling for the Performance Evaluation of All-Optical Networks","authors":"Helder A. Pereira, D. Chaves, C. Bastos-Filho, J. Martins-Filho","doi":"10.1109/ICTON.2007.4296340","DOIUrl":"https://doi.org/10.1109/ICTON.2007.4296340","url":null,"abstract":"We propose a model to consider several physical impairments in optical networks based on the OSNR. Our model considers the dependence of gain and amplified spontaneous emission depletion in optical amplifiers, homodyne crosstalk in optical switches, and four wave mixing in the transmission fibers. We present an application of our model for the evaluation of network performance in terms of blocking probability using a routing and wavelength assignment algorithm. Our results show the impact of each impairment on network performance as a function of device parameters.","PeriodicalId":265478,"journal":{"name":"2007 9th International Conference on Transparent Optical Networks","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127971605","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}
Pub Date : 2007-07-01DOI: 10.1109/ICTON.2007.4296054
N. Costa, T. Alves, A. Cartaxo
The influence of the dispersion compensation granularity on the cross-phase modulation (XPM) induced degradation in non-return-to-zero intensity modulated with direct detection wavelength division multiplexed links at 10 Gbit/s per channel with 50 GHz of channel spacing is assessed analytically for different power levels and four dispersion maps. The dispersion compensation granularity may lead to an increase of the power penalty due to XPM exceeding 1.5 dB for the locally optimal dispersion map (from the XPM degradation viewpoint) with high positive residual dispersion per span. The increase of the XPM normalized variance due to the dispersion compensation granularity is higher for links showing noticeable XPM degradation in the absence of dispersion compensation granularity. Lower XPM degradation tolerance to the dispersion map variation and higher power level leads to higher XPM degradation due to the dispersion compensation granularity.
{"title":"Influence of Dispersion Compensation Granularity on the XPM-Induced Degradation in NRZ-IM-DD WDM Links at 10 Gbit/s per Channel with 50 GHz of Channel Spacing","authors":"N. Costa, T. Alves, A. Cartaxo","doi":"10.1109/ICTON.2007.4296054","DOIUrl":"https://doi.org/10.1109/ICTON.2007.4296054","url":null,"abstract":"The influence of the dispersion compensation granularity on the cross-phase modulation (XPM) induced degradation in non-return-to-zero intensity modulated with direct detection wavelength division multiplexed links at 10 Gbit/s per channel with 50 GHz of channel spacing is assessed analytically for different power levels and four dispersion maps. The dispersion compensation granularity may lead to an increase of the power penalty due to XPM exceeding 1.5 dB for the locally optimal dispersion map (from the XPM degradation viewpoint) with high positive residual dispersion per span. The increase of the XPM normalized variance due to the dispersion compensation granularity is higher for links showing noticeable XPM degradation in the absence of dispersion compensation granularity. Lower XPM degradation tolerance to the dispersion map variation and higher power level leads to higher XPM degradation due to the dispersion compensation granularity.","PeriodicalId":265478,"journal":{"name":"2007 9th International Conference on Transparent Optical Networks","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115896074","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}
Pub Date : 2007-07-01DOI: 10.1109/ICTON.2007.4296045
F. Uherek, J. Chovan
In this work, we demonstrate 2D wavelength-time encoding and decoding OCDMA system. The 2D generalized multi-wavelength prime codewords are used for realization of communication system properties analysis. The encoders and correlators are designed and realized according to used codewords. The experimental data transmission is realized for 80 km optical link. The input and output pulse sequences of correlator are measured and analyzed for different number of active users. The auto-correlation and cross-correlation function and pulse sequences are simulated by PC soft and compared to measured pulse sequence.
{"title":"2-D Wavelength-Time Optical CDMA System - Experiment and Simulation","authors":"F. Uherek, J. Chovan","doi":"10.1109/ICTON.2007.4296045","DOIUrl":"https://doi.org/10.1109/ICTON.2007.4296045","url":null,"abstract":"In this work, we demonstrate 2D wavelength-time encoding and decoding OCDMA system. The 2D generalized multi-wavelength prime codewords are used for realization of communication system properties analysis. The encoders and correlators are designed and realized according to used codewords. The experimental data transmission is realized for 80 km optical link. The input and output pulse sequences of correlator are measured and analyzed for different number of active users. The auto-correlation and cross-correlation function and pulse sequences are simulated by PC soft and compared to measured pulse sequence.","PeriodicalId":265478,"journal":{"name":"2007 9th International Conference on Transparent Optical Networks","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132051971","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：