Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.814710
J. Lee, J.R. Kim, S. Park, M.W. Park, J.S. Yoo, S.D. Lee, A. Choo, T. Kim
Spot size converter (SSC)-SOA consists of a slightly tensile bulk 0.2 /spl mu/m thick InGaAsP (/spl lambda/=1.55 /spl mu/m) active layer and 0.1 /spl mu/m thick InGaAsP (/spl lambda/=1.3 /spl mu/m) waveguides, which were grown by selective area growth (SAG) using MOCVD to implement SSC. The total device length is 1500 /spl mu/m. The thickness enhancement factor was greater than 3 by using SiO/sub 2/ mask. The SAG method with lateral tapering technique provided a typical beam divergences of 8/spl deg//spl times/15/spl deg/. To reduce facet reflectivity, window regions of 20 /spl mu/m length were introduced and the waveguides were tilted by 7/spl deg/. Both facets were antireflection coated to minimize the reflection from the cleaved facet. The gain measurement was done by coupling lensed fibers to both sides. To obtain the higher coupling efficiency in SOA module, taper lensed fiber with AR coating were used. Larger than 22 dB of the fiber to fiber gain was obtained for -20 dBm input power and 150 mA at 1540 nm.
{"title":"Spot size converter integrated semiconductor optical amplifier","authors":"J. Lee, J.R. Kim, S. Park, M.W. Park, J.S. Yoo, S.D. Lee, A. Choo, T. Kim","doi":"10.1109/CLEOPR.1999.814710","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.814710","url":null,"abstract":"Spot size converter (SSC)-SOA consists of a slightly tensile bulk 0.2 /spl mu/m thick InGaAsP (/spl lambda/=1.55 /spl mu/m) active layer and 0.1 /spl mu/m thick InGaAsP (/spl lambda/=1.3 /spl mu/m) waveguides, which were grown by selective area growth (SAG) using MOCVD to implement SSC. The total device length is 1500 /spl mu/m. The thickness enhancement factor was greater than 3 by using SiO/sub 2/ mask. The SAG method with lateral tapering technique provided a typical beam divergences of 8/spl deg//spl times/15/spl deg/. To reduce facet reflectivity, window regions of 20 /spl mu/m length were introduced and the waveguides were tilted by 7/spl deg/. Both facets were antireflection coated to minimize the reflection from the cleaved facet. The gain measurement was done by coupling lensed fibers to both sides. To obtain the higher coupling efficiency in SOA module, taper lensed fiber with AR coating were used. Larger than 22 dB of the fiber to fiber gain was obtained for -20 dBm input power and 150 mA at 1540 nm.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116882058","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 : 1999-08-30DOI: 10.1109/CLEOPR.1999.817967
N. Sugimoto, Zhaoyan Liu, I. Matsui, I. Uno
Asian dust (KOSA) is a well known phenomenon in East Asia. KOSA sometimes transports beyond the Pacific and reaches North America as the case in the April of 1998. It is quite impressive that the satellite sensors, SeaWiFS and TOMS, showed daily images of how the Asian dust transports from dust storms which occurred in China and Mongolia to North America. A number of ground-based lidars are already distributed in the East Asia region. We expect that the horizontally distributed lidars that are able to obtain the vertical distribution of aerosols should give advanced information on the transport mechanism of tropospheric aerosols, especially when we combine the satellite remote sensing.
{"title":"Lidar network for the global observation of Asian-dust (KOSA) transportation","authors":"N. Sugimoto, Zhaoyan Liu, I. Matsui, I. Uno","doi":"10.1109/CLEOPR.1999.817967","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817967","url":null,"abstract":"Asian dust (KOSA) is a well known phenomenon in East Asia. KOSA sometimes transports beyond the Pacific and reaches North America as the case in the April of 1998. It is quite impressive that the satellite sensors, SeaWiFS and TOMS, showed daily images of how the Asian dust transports from dust storms which occurred in China and Mongolia to North America. A number of ground-based lidars are already distributed in the East Asia region. We expect that the horizontally distributed lidars that are able to obtain the vertical distribution of aerosols should give advanced information on the transport mechanism of tropospheric aerosols, especially when we combine the satellite remote sensing.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129757880","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 : 1999-08-30DOI: 10.1109/CLEOPR.1999.817918
Yong-Hoon Cho, H. Lim, W. Jhe
Photoluminescence (PL) up-conversion or anti-Stokes PL (ASPL) is a phenomenon in which the photon energy of PL output is higher than that of the excitation source. The ASPL phenomena in heterojunctions (HJs) and quantum wells (QWs) have recently received considerable attention since they are believed to have a mechanism quite different from the traditional one in bulk materials with potential device applications such as novel light emitting devices which take advantage of high energy up-conversion efficiencies. The ASPL phenomena in HJs or QWs can be observed with an extremely small excitation density of 0.1 W cm/sup -2/ at temperatures below 10 K, in contrast to the case of bulk semiconductors.
上转换或反斯托克斯光致发光(ASPL)是光致发光输出的光子能量高于激发源的光子能量的一种现象。异质结(HJs)和量子阱(qw)中的ASPL现象最近受到了相当大的关注，因为它们被认为具有与块体材料中的传统机制完全不同的机制，具有潜在的器件应用，例如利用高能量上转换效率的新型发光器件。与体块半导体相比，在温度低于10 K的情况下，在极低的激发密度(0.1 W cm/sup -2/)下，可以观察到HJs或QWs中的ASPL现象。
{"title":"High-efficiency luminescence up-conversion of infrared to red light in type-I and type-II Al/sub x/Ga/sub 1-x/As/InGaP single heterostructures","authors":"Yong-Hoon Cho, H. Lim, W. Jhe","doi":"10.1109/CLEOPR.1999.817918","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817918","url":null,"abstract":"Photoluminescence (PL) up-conversion or anti-Stokes PL (ASPL) is a phenomenon in which the photon energy of PL output is higher than that of the excitation source. The ASPL phenomena in heterojunctions (HJs) and quantum wells (QWs) have recently received considerable attention since they are believed to have a mechanism quite different from the traditional one in bulk materials with potential device applications such as novel light emitting devices which take advantage of high energy up-conversion efficiencies. The ASPL phenomena in HJs or QWs can be observed with an extremely small excitation density of 0.1 W cm/sup -2/ at temperatures below 10 K, in contrast to the case of bulk semiconductors.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128523137","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 : 1999-08-30DOI: 10.1109/CLEOPR.1999.811593
N.S. Kim, T. Hamada, T. Kanaya, M. Prabhu, C. Li, J. Song, D. Shen, K. Ueda
High-power fiber lasers have been actively studied in many groups to get compact and comprehensive sources instead of CW Nd-doped crystal lasers for many applications. The high-power fiber lasers have many advantages including very high efficiency with respect to incident pump power, immunity from thermal lensing due to large ratio of surface area to volume, no need of beam steering, simplicity of optical cavity construction, and inherently fiber-coupled output. Analysis on the output performance is needed in order to consider the loss and non-uniform pumping along the fiber. We present the results of numerical analysis for the high-power double-clad fiber lasers including dependence on output mirror reflectivity, two-end pump, absorbed pump power, and fiber loss. Also distribution of output power along the fiber length was presented.
{"title":"Output performance of Nd-doped double-clad fiber laser","authors":"N.S. Kim, T. Hamada, T. Kanaya, M. Prabhu, C. Li, J. Song, D. Shen, K. Ueda","doi":"10.1109/CLEOPR.1999.811593","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.811593","url":null,"abstract":"High-power fiber lasers have been actively studied in many groups to get compact and comprehensive sources instead of CW Nd-doped crystal lasers for many applications. The high-power fiber lasers have many advantages including very high efficiency with respect to incident pump power, immunity from thermal lensing due to large ratio of surface area to volume, no need of beam steering, simplicity of optical cavity construction, and inherently fiber-coupled output. Analysis on the output performance is needed in order to consider the loss and non-uniform pumping along the fiber. We present the results of numerical analysis for the high-power double-clad fiber lasers including dependence on output mirror reflectivity, two-end pump, absorbed pump power, and fiber loss. Also distribution of output power along the fiber length was presented.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128789232","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 : 1999-08-30DOI: 10.1109/CLEOPR.1999.814723
J. Saikawa, S. Kurimura, I. Shoji, T. Taira
Optical data storage in volume holograms has been an exciting prospect for high data storage technology since the digital volume holographic storage system was demonstrated. Angle and wavelength-multiplexed recordings have excellent potential for a large storage capacity. Recently we developed a diode-pumped single-frequency and tunable Yb:YAG microchip laser. We demonstrate the angle and wavelength multiplexed recording by using the tunable intracavity frequency-doubled Yb:YAG green laser.
{"title":"Volume holographic memories by using tunable frequency-doubled Yb:YAG microchip laser","authors":"J. Saikawa, S. Kurimura, I. Shoji, T. Taira","doi":"10.1109/CLEOPR.1999.814723","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.814723","url":null,"abstract":"Optical data storage in volume holograms has been an exciting prospect for high data storage technology since the digital volume holographic storage system was demonstrated. Angle and wavelength-multiplexed recordings have excellent potential for a large storage capacity. Recently we developed a diode-pumped single-frequency and tunable Yb:YAG microchip laser. We demonstrate the angle and wavelength multiplexed recording by using the tunable intracavity frequency-doubled Yb:YAG green laser.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"42 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129154238","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 : 1999-08-30DOI: 10.1109/CLEOPR.1999.811409
S. Lee, J. McNeil, T. Zenker, T. Chyba
Methane plays an important role as one of the greenhouse gases in the atmosphere. The differential absorption lidar (DIAL) technique is widely used for range-resolved measurements of the concentration of atmospheric constituents. This technique uses two wavelengths to measure the difference in the absorption of the lidar return signal as the laser wavelength is varied between a on-line wavelength that is strongly absorbed by molecules and a off-line wavelength that is not absorbed. The advantage of the DIAL technique is that only differences or ratios in the various parameters need to be considered. Methane has several absorption bands accessible by lasers. The mid-infrared region of the spectrum is rich in absorption features for methane and has a weaker solar background than the near-IR region. These are the important advantages of a mid-infrared DIAL system for methane measurements. A ground-based lidar system in the 1.45-4 /spl mu/m region for the remote detection of methane is described and lidar measurements of methane concentration with the system are presented. The lidar system consists of four parts: the laser source, laser wavelength diagnostics, the receiver, and the data acquisition electronics.
{"title":"Methane concentration measurements with a mid-infrared optical parametric oscillator-based differential absorption lidar system","authors":"S. Lee, J. McNeil, T. Zenker, T. Chyba","doi":"10.1109/CLEOPR.1999.811409","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.811409","url":null,"abstract":"Methane plays an important role as one of the greenhouse gases in the atmosphere. The differential absorption lidar (DIAL) technique is widely used for range-resolved measurements of the concentration of atmospheric constituents. This technique uses two wavelengths to measure the difference in the absorption of the lidar return signal as the laser wavelength is varied between a on-line wavelength that is strongly absorbed by molecules and a off-line wavelength that is not absorbed. The advantage of the DIAL technique is that only differences or ratios in the various parameters need to be considered. Methane has several absorption bands accessible by lasers. The mid-infrared region of the spectrum is rich in absorption features for methane and has a weaker solar background than the near-IR region. These are the important advantages of a mid-infrared DIAL system for methane measurements. A ground-based lidar system in the 1.45-4 /spl mu/m region for the remote detection of methane is described and lidar measurements of methane concentration with the system are presented. The lidar system consists of four parts: the laser source, laser wavelength diagnostics, the receiver, and the data acquisition electronics.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129448564","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 : 1999-08-30DOI: 10.1109/CLEOPR.1999.811442
S. O’Byrne, P. Danehy, M. Cooper
A major difficulty associated with performing planar laser-induced fluorescence (PLIF) visualisations of high-speed gas flows is that a large number of experimental parameters affect the quality of the measured data. The acquisition of a high-quality PLIF image may require several free parameters to be varied independently. Doing so in an experiment requires large amounts of time and effort. It is therefore desirable to use a method in which the effects of changing experimental parameters may be investigated before performing the actual experiments. One such method, known as computational-flow-imaging PLIF (CFI-PLIF), is discussed. We present an example of the use of CFI in designing a flow-visualisation experiment.
{"title":"Computational modelling as an aid to shock tunnel planar laser-induced fluorescence visualisation","authors":"S. O’Byrne, P. Danehy, M. Cooper","doi":"10.1109/CLEOPR.1999.811442","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.811442","url":null,"abstract":"A major difficulty associated with performing planar laser-induced fluorescence (PLIF) visualisations of high-speed gas flows is that a large number of experimental parameters affect the quality of the measured data. The acquisition of a high-quality PLIF image may require several free parameters to be varied independently. Doing so in an experiment requires large amounts of time and effort. It is therefore desirable to use a method in which the effects of changing experimental parameters may be investigated before performing the actual experiments. One such method, known as computational-flow-imaging PLIF (CFI-PLIF), is discussed. We present an example of the use of CFI in designing a flow-visualisation experiment.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129483463","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 : 1999-08-30DOI: 10.1109/CLEOPR.1999.817856
C. Orlemann, S. Doose, C. Schulz
In the study presented here, air flows were homogeneously seeded with NO/sub 2/ at low concentrations (few hundreds of ppm). By photodissociation of NO/sub 2/ at 308 nm (XeCl excimer laser at approx. 200 MW/cm/sup 2/) NO was formed, which was imaged by LIF at various delays after its generation. Whereas several other tracers disappear rather quickly due to energy transfer processes (from vibrationally excited molecules) or high reactivity (in the case of OH/sup 4/), due to small reaction cross-sections, NO is stable on the timescale of interest. Therefore, using NO, the movements of volume elements can be imaged at longer times and larger distances compared to other techniques. Furthermore, with the molecular weight of NO being between that of N/sub 2/ and O/sub 2/ and diffusion coefficients close to nitrogen, NO turns out to be a good choice to characterize the small-scale behavior of turbulent air flows.
{"title":"Investigation of small-scale flow structures using NO-flow tagging by photodissociation of NO/sub 2/","authors":"C. Orlemann, S. Doose, C. Schulz","doi":"10.1109/CLEOPR.1999.817856","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817856","url":null,"abstract":"In the study presented here, air flows were homogeneously seeded with NO/sub 2/ at low concentrations (few hundreds of ppm). By photodissociation of NO/sub 2/ at 308 nm (XeCl excimer laser at approx. 200 MW/cm/sup 2/) NO was formed, which was imaged by LIF at various delays after its generation. Whereas several other tracers disappear rather quickly due to energy transfer processes (from vibrationally excited molecules) or high reactivity (in the case of OH/sup 4/), due to small reaction cross-sections, NO is stable on the timescale of interest. Therefore, using NO, the movements of volume elements can be imaged at longer times and larger distances compared to other techniques. Furthermore, with the molecular weight of NO being between that of N/sub 2/ and O/sub 2/ and diffusion coefficients close to nitrogen, NO turns out to be a good choice to characterize the small-scale behavior of turbulent air flows.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130404186","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 : 1999-08-30DOI: 10.1109/CLEOPR.1999.817956
H.S. Lim, B. Ooi, Y. Lam, Y. Chan, V. Aimez, J. Beauvais, J. Beerens
Quantum well intermixing (QWI) using a neutral impurity induced disordering technique is of great interest in producing photonic integrated circuits (PICs). We report a high selectivity QWI process using a low energy arsenic implantation induced disordering technique. Since it is known that free electrons from impurities result in high optical absorption and degrade the quality of the material after intermixing, arsenic, an electrically neutral species in the InGaAs/InGaAsP system, was chosen for the process development. The relatively low implantation energy, 360 keV, reduces the damage generation and results in a shallow implantation depth far away from the active region. We have successfully blue shifted quantum well laser material with a control on the amount of intermixing by varying the dose of As implantation at 200/spl deg/C. A wide range of differential bandgap shifts going up to 60 meV are reported. PICs such as extended cavity lasers and monolithic multiple wavelength laser sources are currently being investigated using this technique.
{"title":"Photonic integration of InGaAs/InGaAsP laser using low energy arsenic implantation induced disordering for quantum well intermixing","authors":"H.S. Lim, B. Ooi, Y. Lam, Y. Chan, V. Aimez, J. Beauvais, J. Beerens","doi":"10.1109/CLEOPR.1999.817956","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817956","url":null,"abstract":"Quantum well intermixing (QWI) using a neutral impurity induced disordering technique is of great interest in producing photonic integrated circuits (PICs). We report a high selectivity QWI process using a low energy arsenic implantation induced disordering technique. Since it is known that free electrons from impurities result in high optical absorption and degrade the quality of the material after intermixing, arsenic, an electrically neutral species in the InGaAs/InGaAsP system, was chosen for the process development. The relatively low implantation energy, 360 keV, reduces the damage generation and results in a shallow implantation depth far away from the active region. We have successfully blue shifted quantum well laser material with a control on the amount of intermixing by varying the dose of As implantation at 200/spl deg/C. A wide range of differential bandgap shifts going up to 60 meV are reported. PICs such as extended cavity lasers and monolithic multiple wavelength laser sources are currently being investigated using this technique.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126652426","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 : 1999-08-30DOI: 10.1109/CLEOPR.1999.817768
Z. Meng, Y. Nakata, T. Yoshimura, T. Okada
Er-doped heavy-metal fluoride glass, because of its wider emission bandwidth around 1500 nm, which spans the most important communications window, now has been investigated as one of the most promising materials for wide-band optical fiber amplifier, which would be of great value in the future wavelength division multiplexing (WDM) optical fiber communication system. However, one drawback of Er-doped fluoride glass is its low branching ratio leading to 1.55 /spl mu/m amplification under 980 nm excitation which is adopted for a low noise amplifier. Now this problem is expected to be solved by the rare earth co-doping technique. It has been proved that Ce co-doping into Er-doped fluoride glasses significantly improved the fluorescence quantum yield for the 1.55 /spl mu/m transition with 980 nm excitation. The Ce,Er co-doped fluoride glass is expected to be a new candidate material of a fiber amplifier for WDM.
{"title":"Improved fluorescence characteristics of rare earth co-doping heavy-metal fluoride glasses for optical fiber amplifier","authors":"Z. Meng, Y. Nakata, T. Yoshimura, T. Okada","doi":"10.1109/CLEOPR.1999.817768","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817768","url":null,"abstract":"Er-doped heavy-metal fluoride glass, because of its wider emission bandwidth around 1500 nm, which spans the most important communications window, now has been investigated as one of the most promising materials for wide-band optical fiber amplifier, which would be of great value in the future wavelength division multiplexing (WDM) optical fiber communication system. However, one drawback of Er-doped fluoride glass is its low branching ratio leading to 1.55 /spl mu/m amplification under 980 nm excitation which is adopted for a low noise amplifier. Now this problem is expected to be solved by the rare earth co-doping technique. It has been proved that Ce co-doping into Er-doped fluoride glasses significantly improved the fluorescence quantum yield for the 1.55 /spl mu/m transition with 980 nm excitation. The Ce,Er co-doped fluoride glass is expected to be a new candidate material of a fiber amplifier for WDM.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130598545","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}
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