Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.811505
Sae Chae Jeoung, Yong Hee Kim, Dongho Kim, Ja-Young Han, H. Shim
We report femtosecond pump-probe experimental results and emission spectral changes in PPV with a change of excitation power density in order to have a deeper understanding on the primary photoexcitations and the nature of spectrally narrowed emission (SNE).
{"title":"Femtosecond pump-probe investigation on relaxation of photoexcitations and spectral narrowing of photoluminescence for PPV","authors":"Sae Chae Jeoung, Yong Hee Kim, Dongho Kim, Ja-Young Han, H. Shim","doi":"10.1109/CLEOPR.1999.811505","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.811505","url":null,"abstract":"We report femtosecond pump-probe experimental results and emission spectral changes in PPV with a change of excitation power density in order to have a deeper understanding on the primary photoexcitations and the nature of spectrally narrowed emission (SNE).","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":"121356620","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.1999.811549
E. Sackinger, Y. Ota, T. Gabara, W. Fischer
ATM-based passive optical networks (ATM-PON) such as full service access network (FSAN) require special burst-mode transmitters and receivers for the upstream direction (from the subscriber to the central office). This is necessary because multiple subscribers share the same optical fiber using time division multiple access (TDMA). A key component of such a PON system is the burst-mode transmitter which is located inside the optical network unit (ONU) at the subscriber end. It must be low in power consumption since it must run from a back-up battery during power outages, low cost in order to be competitive with regard to the copper-based infrastructure, and stable over a wide temperature range because it may be located outdoors. The burst-mode transceiver chip reported earlier consumes 300 mW (receiver and transmitter) at 50 Mb/s. The driver IC presented here consumes only 15 mW at 155 Mb/s, and, for the first time to the best of our knowledge, implements reliable automatic power control (APC) and a laser end-of-life detection function in a burst-mode driver. The chip was fabricated using a 3.3 V, 0.5 pm standard CMOS technology.
{"title":"Low power CMOS burst-mode laser driver for full service access network application","authors":"E. Sackinger, Y. Ota, T. Gabara, W. Fischer","doi":"10.1109/CLEOPR.1999.811549","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.811549","url":null,"abstract":"ATM-based passive optical networks (ATM-PON) such as full service access network (FSAN) require special burst-mode transmitters and receivers for the upstream direction (from the subscriber to the central office). This is necessary because multiple subscribers share the same optical fiber using time division multiple access (TDMA). A key component of such a PON system is the burst-mode transmitter which is located inside the optical network unit (ONU) at the subscriber end. It must be low in power consumption since it must run from a back-up battery during power outages, low cost in order to be competitive with regard to the copper-based infrastructure, and stable over a wide temperature range because it may be located outdoors. The burst-mode transceiver chip reported earlier consumes 300 mW (receiver and transmitter) at 50 Mb/s. The driver IC presented here consumes only 15 mW at 155 Mb/s, and, for the first time to the best of our knowledge, implements reliable automatic power control (APC) and a laser end-of-life detection function in a burst-mode driver. The chip was fabricated using a 3.3 V, 0.5 pm standard CMOS technology.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"11 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":"121438214","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.1999.817875
S. Han, J. Wu
We propose a polarization interferometry technique to measure the electro-optic coefficient in an optically active system. The technique makes use of the interference of two polarization states of the incident beam after experiencing both the electro-optic phase modulation and the optical rotation in the Bi/sub 12/SO/sub 20/ crystal.
{"title":"Measurement of the linear electro-optic effect in chiral nonlinear optical crystal","authors":"S. Han, J. Wu","doi":"10.1109/CLEOPR.1999.817875","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817875","url":null,"abstract":"We propose a polarization interferometry technique to measure the electro-optic coefficient in an optically active system. The technique makes use of the interference of two polarization states of the incident beam after experiencing both the electro-optic phase modulation and the optical rotation in the Bi/sub 12/SO/sub 20/ crystal.","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":"114298180","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.1999.811647
A. Osuka, A. Nakano, H. Shiratori, S. Akimoto, Y. Nishimura, T. Yamazaki, I. Yamazaki
Photophysical processes such as excitation energy transfer and electron transfer are expected to occur very fast in organized molecular systems in which reactant molecules are arranged with close proximity and optimal orientation, and they can be coupled to an adjacent molecule with relatively strong molecular interaction. In an extreme of such strongly interconnected molecular systems, the photoinduced reaction can compete with or exceed the vibrational relaxation from vibrational levels initially photoexcited. We have investigated ultrafast excitation migration and relaxation in circular and linear arrangements of zinc porphyrin (ZnP) with a femtosecond fluorescence up-conversion method and a ps time-correlated photon-counting method. The time-resolved fluorescence spectra revealed non-equilibrium processes of excitation delocalization and transport in femtosecond and picosecond time scales.
{"title":"Excitation delocalization and relaxation in linear and circular arrays of porphyrins","authors":"A. Osuka, A. Nakano, H. Shiratori, S. Akimoto, Y. Nishimura, T. Yamazaki, I. Yamazaki","doi":"10.1109/CLEOPR.1999.811647","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.811647","url":null,"abstract":"Photophysical processes such as excitation energy transfer and electron transfer are expected to occur very fast in organized molecular systems in which reactant molecules are arranged with close proximity and optimal orientation, and they can be coupled to an adjacent molecule with relatively strong molecular interaction. In an extreme of such strongly interconnected molecular systems, the photoinduced reaction can compete with or exceed the vibrational relaxation from vibrational levels initially photoexcited. We have investigated ultrafast excitation migration and relaxation in circular and linear arrangements of zinc porphyrin (ZnP) with a femtosecond fluorescence up-conversion method and a ps time-correlated photon-counting method. The time-resolved fluorescence spectra revealed non-equilibrium processes of excitation delocalization and transport in femtosecond and picosecond time scales.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"445 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113995974","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.1999.814745
M. Takahashi, T. Ohtoshi, K. Naono
A laser diode (LD) with narrow beam divergence is attractive for a low cost subscriber light source module, since its high fiber-coupling efficiency enables lensless assembly. Integrating a beam-expander (BEX) with an LD is one of the most promising ways for decreasing beam divergence of an LD. In this paper, we explicitly analyzed the reflection in a horizontally tapered BEX integrated with a LD by the finite-difference time-domain (FD-TD) method using massively parallel processors to reduce computation time.
{"title":"Numerical analysis of a beam-expander integrated laser diode by FD-TD method","authors":"M. Takahashi, T. Ohtoshi, K. Naono","doi":"10.1109/CLEOPR.1999.814745","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.814745","url":null,"abstract":"A laser diode (LD) with narrow beam divergence is attractive for a low cost subscriber light source module, since its high fiber-coupling efficiency enables lensless assembly. Integrating a beam-expander (BEX) with an LD is one of the most promising ways for decreasing beam divergence of an LD. In this paper, we explicitly analyzed the reflection in a horizontally tapered BEX integrated with a LD by the finite-difference time-domain (FD-TD) method using massively parallel processors to reduce computation time.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"11 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":"122912601","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: 10.1007/978-1-4419-8907-9_79
Y.-H. Kim, S. Kulik, M. Scully, Y. Shih
{"title":"A delayed choice quantum eraser experiment","authors":"Y.-H. Kim, S. Kulik, M. Scully, Y. Shih","doi":"10.1007/978-1-4419-8907-9_79","DOIUrl":"https://doi.org/10.1007/978-1-4419-8907-9_79","url":null,"abstract":"","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"13 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":"121779432","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.1999.811562
T. Yagi
Development of a compact terra watt (TW) laser system which has a high stability of pointing and output power is expected to create new applications of a short pulse laser in scientific and industrial field of research. We have investigated a cavity configuration of a Ti:sapphire regenerative laser amplifier to amplify a seed pulse with pulse energy of 1 nJ to more than 10 mJ of the pulse energy without damaging optical components in the cavity. The resonator in the regenerative amplifier is made of convex and concave mirror as end mirrors, so that the enlarged mode cross section matches the pump volume in the Ti:sapphire crystal, and additional concave mirror for collimating the beam passing through a Pockels cell in the cavity.
{"title":"A compact high efficiency and high power regenerative amplifier","authors":"T. Yagi","doi":"10.1109/CLEOPR.1999.811562","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.811562","url":null,"abstract":"Development of a compact terra watt (TW) laser system which has a high stability of pointing and output power is expected to create new applications of a short pulse laser in scientific and industrial field of research. We have investigated a cavity configuration of a Ti:sapphire regenerative laser amplifier to amplify a seed pulse with pulse energy of 1 nJ to more than 10 mJ of the pulse energy without damaging optical components in the cavity. The resonator in the regenerative amplifier is made of convex and concave mirror as end mirrors, so that the enlarged mode cross section matches the pump volume in the Ti:sapphire crystal, and additional concave mirror for collimating the beam passing through a Pockels cell in the cavity.","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":"127585538","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.1999.811432
S. Mitsugi, F. Koyama, A. Matsutani, K. Iga
A dry etching technique is important for microfabrication of photonic devices, including semiconductor microcavities. Smooth etched sidewalls are needed to form low loss semiconductor microcavities and optical waveguides, because rough surfaces cause noticeable scattering losses. So far, scattering losses in etched reflectors or waveguides caused by interface roughness have been theoretically studied. Scattering losses should be dependent on not only the amplitude of roughness but also its correlation length; however the spatial frequency of the roughness of etched surfaces has not been discussed yet. In this paper, we present a spatial frequency analysis of the measured sidewall roughness of dry etched InP facets, and the correlation length of the sidewall roughness is estimated from the power spectrum to discuss its effect on reflectivities of the etched facet.
{"title":"Fabrication of InP vertical facets by reactive ion etching and sidewall roughness evaluation for semiconductor microcavities","authors":"S. Mitsugi, F. Koyama, A. Matsutani, K. Iga","doi":"10.1109/CLEOPR.1999.811432","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.811432","url":null,"abstract":"A dry etching technique is important for microfabrication of photonic devices, including semiconductor microcavities. Smooth etched sidewalls are needed to form low loss semiconductor microcavities and optical waveguides, because rough surfaces cause noticeable scattering losses. So far, scattering losses in etched reflectors or waveguides caused by interface roughness have been theoretically studied. Scattering losses should be dependent on not only the amplitude of roughness but also its correlation length; however the spatial frequency of the roughness of etched surfaces has not been discussed yet. In this paper, we present a spatial frequency analysis of the measured sidewall roughness of dry etched InP facets, and the correlation length of the sidewall roughness is estimated from the power spectrum to discuss its effect on reflectivities of the etched facet.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"36 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":"127731906","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.1999.817896
N. Kim, S.R. Cho, S.D. Lee, H. Ha, D. Bang, J. Yu, Y. Oh, J.S. Ma, A. Choo, T. Kim
High speed and low chirp light sources are among the most essential components in long distance multigigabit optical communication systems. InGaAsP-InGaAsP electroabsorption (EA) modulator integrated DFB-LDs (EMILD) have attracted special interest because of their small size, low operating voltage and low chirp. In this paper, the optical and electrical characteristics of an InGaAs-InGaAsP MQW EMILD were studied.
{"title":"InGaAs/InGaAsP MQW electroabsorption modulator integrated DFB-LD structure grown by selective area epitaxy","authors":"N. Kim, S.R. Cho, S.D. Lee, H. Ha, D. Bang, J. Yu, Y. Oh, J.S. Ma, A. Choo, T. Kim","doi":"10.1109/CLEOPR.1999.817896","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817896","url":null,"abstract":"High speed and low chirp light sources are among the most essential components in long distance multigigabit optical communication systems. InGaAsP-InGaAsP electroabsorption (EA) modulator integrated DFB-LDs (EMILD) have attracted special interest because of their small size, low operating voltage and low chirp. In this paper, the optical and electrical characteristics of an InGaAs-InGaAsP MQW EMILD were studied.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"11 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":"128019185","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.1999.817730
M. Okuno
Optical wavelength division multiplexing (WDM) networks are being studied with a view to enlarging transmission capacity and improving network flexibility. Silica-based planar lightwave circuits (PLCs) can provide various key practical components for these systems because they are suitable for large-scale integration, can be mass produced and offer long-term stability. This paper reviews recent work on three-types of silica-based PLC device; arrayed-waveguide gratings (AWGs), thermo-optic (TO) switches, and a high-speed optical wavelength selector (OWS) which employs hybrid-integration.
{"title":"Recent progress on silica-based planar lightwave circuit technology","authors":"M. Okuno","doi":"10.1109/CLEOPR.1999.817730","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817730","url":null,"abstract":"Optical wavelength division multiplexing (WDM) networks are being studied with a view to enlarging transmission capacity and improving network flexibility. Silica-based planar lightwave circuits (PLCs) can provide various key practical components for these systems because they are suitable for large-scale integration, can be mass produced and offer long-term stability. This paper reviews recent work on three-types of silica-based PLC device; arrayed-waveguide gratings (AWGs), thermo-optic (TO) switches, and a high-speed optical wavelength selector (OWS) which employs hybrid-integration.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"4 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132576009","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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