Pub Date : 2001-11-12DOI: 10.1109/LEOS.2001.969163
In Kim, Sang-Dong Lee, Shigeki Cho, Eunhwa Lee, A. Choo, Taeil Kim
The electroabsorption modulator still shows large transient chirp and thus is hard to operate at higher bit rate without a high insertion loss. To overcome this obstacle, it is imperative to fully understand the chirp characteristics caused by Stark effect in the multiple quantum-well (MQW) structures. This work presents a simple experimental method of measuring MQW electro-absorption and the chirp parameter.
{"title":"Characterization of the electro-absorption modulator chirp using modulated-transmission spectroscopy","authors":"In Kim, Sang-Dong Lee, Shigeki Cho, Eunhwa Lee, A. Choo, Taeil Kim","doi":"10.1109/LEOS.2001.969163","DOIUrl":"https://doi.org/10.1109/LEOS.2001.969163","url":null,"abstract":"The electroabsorption modulator still shows large transient chirp and thus is hard to operate at higher bit rate without a high insertion loss. To overcome this obstacle, it is imperative to fully understand the chirp characteristics caused by Stark effect in the multiple quantum-well (MQW) structures. This work presents a simple experimental method of measuring MQW electro-absorption and the chirp parameter.","PeriodicalId":18008,"journal":{"name":"LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242)","volume":"2 1","pages":"42-43 vol.1"},"PeriodicalIF":0.0,"publicationDate":"2001-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74402693","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 : 2001-11-12DOI: 10.1109/LEOS.2001.969303
E. Yamazaki, S. Wakana, M. Kishi, M. Iwanami, S. Hoshino, A. Tsuchiya
We report on the first fine x-z mapping experiment of magnetic near-field distribution over fine circuit patterns. Required three-dimensional (3D) spatial resolution was brought about by utilizing the fiber-edged magneto-optic (FEMO) probe structure. The 3D mapping technique of electromagnetic fields provides more information about finer variations in the vertical (z) direction in cases of finer circuits. The electro-optic/magneto-optic (EO/MO) probing techniques are promising toward this purpose since one can take its attractive natures such as wide-bandwidth, high-sensitivity, low invasiveness, and relatively high-spatial-resolution.
{"title":"Three-dimensional magneto-optic near-field mapping over 10-50 /spl mu/m-scale line and space circuit patterns","authors":"E. Yamazaki, S. Wakana, M. Kishi, M. Iwanami, S. Hoshino, A. Tsuchiya","doi":"10.1109/LEOS.2001.969303","DOIUrl":"https://doi.org/10.1109/LEOS.2001.969303","url":null,"abstract":"We report on the first fine x-z mapping experiment of magnetic near-field distribution over fine circuit patterns. Required three-dimensional (3D) spatial resolution was brought about by utilizing the fiber-edged magneto-optic (FEMO) probe structure. The 3D mapping technique of electromagnetic fields provides more information about finer variations in the vertical (z) direction in cases of finer circuits. The electro-optic/magneto-optic (EO/MO) probing techniques are promising toward this purpose since one can take its attractive natures such as wide-bandwidth, high-sensitivity, low invasiveness, and relatively high-spatial-resolution.","PeriodicalId":18008,"journal":{"name":"LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242)","volume":"17 1","pages":"318-319 vol.1"},"PeriodicalIF":0.0,"publicationDate":"2001-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78448281","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 : 2001-11-12DOI: 10.1109/LEOS.2001.969200
J. J. Hargreaves, P. Juodawlkis, J. Plant, J. Donnelly, J. Twichell, F. Rana, Rajeev J Ram
We report residual phase-noise measurements of both actively mode-locked fiber and semiconductor lasers using sinusoidal mode-locking frequencies between 500 MHz and 5 GHz. The fiber laser is a polarization maintaining erbium-doped fiber ring laser that is harmonically mode-locked using a sinusoidal drive signal. The mode-locked semiconductor laser uses an external cavity configuration.
{"title":"Residual phase-noise measurements of actively mode-locked fiber and semiconductor lasers","authors":"J. J. Hargreaves, P. Juodawlkis, J. Plant, J. Donnelly, J. Twichell, F. Rana, Rajeev J Ram","doi":"10.1109/LEOS.2001.969200","DOIUrl":"https://doi.org/10.1109/LEOS.2001.969200","url":null,"abstract":"We report residual phase-noise measurements of both actively mode-locked fiber and semiconductor lasers using sinusoidal mode-locking frequencies between 500 MHz and 5 GHz. The fiber laser is a polarization maintaining erbium-doped fiber ring laser that is harmonically mode-locked using a sinusoidal drive signal. The mode-locked semiconductor laser uses an external cavity configuration.","PeriodicalId":18008,"journal":{"name":"LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242)","volume":"212 1","pages":"115-116 vol.1"},"PeriodicalIF":0.0,"publicationDate":"2001-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77437939","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 : 2001-11-12DOI: 10.1109/LEOS.2001.969336
J. Jang, G. Cueva, I. Adesida, P. Fay, W. Hoke, P.J. Lemonias
Our previous study on double heterojunction InGaAs/InGaAlAs/InAlAs metamorphic photodiodes has shown photodiodes with dark currents as low as 500 pA, responsivity of 0.6 A/W, and bandwidths up to 38 GHz. In this paper, we report our results on the high power handling capability of metamorphic photodiodes under high power optical illumination up to 10 dBm. In ultra-high speed optical fiber communication systems operating at 40 Gbit/s or beyond, the photodiodes that can handle high optical input power are needed because an EDFA (erbium doped fiber amplifier) is often placed in front of the photoreceiver. It is imperative to study the frequency response of the metamorphic photodiodes under high power optical illumination to prove that these photodiodes based on metamorphic technology can be a strong candidate for high speed optical fiber communications.
{"title":"Photoresponses of metamorphic double heterojunction photodiodes under high power optical illumination","authors":"J. Jang, G. Cueva, I. Adesida, P. Fay, W. Hoke, P.J. Lemonias","doi":"10.1109/LEOS.2001.969336","DOIUrl":"https://doi.org/10.1109/LEOS.2001.969336","url":null,"abstract":"Our previous study on double heterojunction InGaAs/InGaAlAs/InAlAs metamorphic photodiodes has shown photodiodes with dark currents as low as 500 pA, responsivity of 0.6 A/W, and bandwidths up to 38 GHz. In this paper, we report our results on the high power handling capability of metamorphic photodiodes under high power optical illumination up to 10 dBm. In ultra-high speed optical fiber communication systems operating at 40 Gbit/s or beyond, the photodiodes that can handle high optical input power are needed because an EDFA (erbium doped fiber amplifier) is often placed in front of the photoreceiver. It is imperative to study the frequency response of the metamorphic photodiodes under high power optical illumination to prove that these photodiodes based on metamorphic technology can be a strong candidate for high speed optical fiber communications.","PeriodicalId":18008,"journal":{"name":"LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242)","volume":"105 1","pages":"384-385 vol.1"},"PeriodicalIF":0.0,"publicationDate":"2001-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77679661","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 : 2001-11-12DOI: 10.1109/LEOS.2001.969055
M. Silver, W. Booij, S. Malik, A. Galbraith, S. Uppal, P. F. Mcbrien, G. Berry, P. Ryder, S. Chandler, D. M. Atkin, R. Harding, R. Ash
We have developed a 1300 nm InGaAsP MQW DFB laser which, due to its high temperature and speed performance, enables small-form-factor transceiver modules to operate at 2.5Gbit/s, uncooled, in a wide temperature range from -20 to 85 C.
{"title":"Very wide temperature (-20-95/spl deg/C) operation of an uncooled 2.5 Gbit/s 1300 nm DFB laser","authors":"M. Silver, W. Booij, S. Malik, A. Galbraith, S. Uppal, P. F. Mcbrien, G. Berry, P. Ryder, S. Chandler, D. M. Atkin, R. Harding, R. Ash","doi":"10.1109/LEOS.2001.969055","DOIUrl":"https://doi.org/10.1109/LEOS.2001.969055","url":null,"abstract":"We have developed a 1300 nm InGaAsP MQW DFB laser which, due to its high temperature and speed performance, enables small-form-factor transceiver modules to operate at 2.5Gbit/s, uncooled, in a wide temperature range from -20 to 85 C.","PeriodicalId":18008,"journal":{"name":"LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242)","volume":"18 1","pages":"796-797 vol.2"},"PeriodicalIF":0.0,"publicationDate":"2001-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77691409","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 : 2001-11-12DOI: 10.1109/LEOS.2001.969226
E. Skogen, J. Barton, S. Denbaars, L. Coldren
We apply quantum well intermixing (QWI) to the sampled grating distributed Bragg reflector (SGDBR) laser to demonstrate tuning by current injection in the QWI material and to improve device design. Specifically, by utilizing a centered quantum well active region the mode overlap with the quantum wells is increased by a factor of 1.5 over the offset quantum well case, where the quantum wells are positioned above the waveguide. In this way the modal gain is increased, improving the characteristics of the laser. In order to create a non-absorbing waveguide, QWI has been applied to the back and front mirror to blue shift the quantum well band edge.
{"title":"Tunable buried ridge stripe sampled grating distributed Bragg reflector lasers utilizing quantum well intermixing","authors":"E. Skogen, J. Barton, S. Denbaars, L. Coldren","doi":"10.1109/LEOS.2001.969226","DOIUrl":"https://doi.org/10.1109/LEOS.2001.969226","url":null,"abstract":"We apply quantum well intermixing (QWI) to the sampled grating distributed Bragg reflector (SGDBR) laser to demonstrate tuning by current injection in the QWI material and to improve device design. Specifically, by utilizing a centered quantum well active region the mode overlap with the quantum wells is increased by a factor of 1.5 over the offset quantum well case, where the quantum wells are positioned above the waveguide. In this way the modal gain is increased, improving the characteristics of the laser. In order to create a non-absorbing waveguide, QWI has been applied to the back and front mirror to blue shift the quantum well band edge.","PeriodicalId":18008,"journal":{"name":"LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242)","volume":"9 1","pages":"169-170 vol.1"},"PeriodicalIF":0.0,"publicationDate":"2001-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79917739","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 : 2001-11-12DOI: 10.1109/LEOS.2001.969169
C. Lim, A. Nirmalathas, D. Novak, R. Tucker, R. Waterhouse
In this paper we present a novel wavelength-interleaving scheme to increase the optical spectral efficiency in mm-wave WDM fiber-radio systems and demonstrate the feasibility of the proposed scheme via experiment and simulation. The technique employs wavelength interleaving in conjunction with OSSB+C modulation. A wavelength-interleaved optical add-drop multiplexer using fiber gratings and an optical circulator was realized to implement the technique, the feasibility of which was demonstrated via three interleaved WDM channels each transporting a 155 Mb/s BPSK signal at 36 GHz over a 20 km fiber link. Capacity analysis shows that the wavelength-interleaving technique increases the maximum number of channels by almost 75% after taking into account overall system performance and device limitation.
{"title":"Wavelength-interleaving technique to improve optical spectral efficiency in millimeter-wave WDM fiber-radio","authors":"C. Lim, A. Nirmalathas, D. Novak, R. Tucker, R. Waterhouse","doi":"10.1109/LEOS.2001.969169","DOIUrl":"https://doi.org/10.1109/LEOS.2001.969169","url":null,"abstract":"In this paper we present a novel wavelength-interleaving scheme to increase the optical spectral efficiency in mm-wave WDM fiber-radio systems and demonstrate the feasibility of the proposed scheme via experiment and simulation. The technique employs wavelength interleaving in conjunction with OSSB+C modulation. A wavelength-interleaved optical add-drop multiplexer using fiber gratings and an optical circulator was realized to implement the technique, the feasibility of which was demonstrated via three interleaved WDM channels each transporting a 155 Mb/s BPSK signal at 36 GHz over a 20 km fiber link. Capacity analysis shows that the wavelength-interleaving technique increases the maximum number of channels by almost 75% after taking into account overall system performance and device limitation.","PeriodicalId":18008,"journal":{"name":"LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242)","volume":"116 1","pages":"54-55 vol.1"},"PeriodicalIF":0.0,"publicationDate":"2001-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80277265","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 : 2001-11-12DOI: 10.1109/LEOS.2001.968845
Hideki Midorikawa, K. Muranushi, N. Nunoya, T. Sano, S. Tamura, S. Arai
We report on the lasing properties of SC 5-layered Q-wire lasers with wire width of 23 nm. The spontaneous emission efficiency below the threshold was almost comparable to that of the Q-film lasers up to 85 C, that revealed low-damage property of the etched/regrown interfaces.
{"title":"1.5 /spl mu/m wavelength GaInAsP/InP 5-layered quantum-wire lasers fabricated by CH/sub 4//H/sub 2/ dry etching and regrowth","authors":"Hideki Midorikawa, K. Muranushi, N. Nunoya, T. Sano, S. Tamura, S. Arai","doi":"10.1109/LEOS.2001.968845","DOIUrl":"https://doi.org/10.1109/LEOS.2001.968845","url":null,"abstract":"We report on the lasing properties of SC 5-layered Q-wire lasers with wire width of 23 nm. The spontaneous emission efficiency below the threshold was almost comparable to that of the Q-film lasers up to 85 C, that revealed low-damage property of the etched/regrown interfaces.","PeriodicalId":18008,"journal":{"name":"LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242)","volume":"2 1","pages":"407-408 vol.2"},"PeriodicalIF":0.0,"publicationDate":"2001-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79438256","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 : 2001-11-12DOI: 10.1109/LEOS.2001.969298
R. Hui, S. Taherion, P. Gogineni, C. Allen, D. Adams
We have demonstrated a miniature microwave chirp generator using a three-section dual-wavelength DFB laser. Because the saturable absorption section, which performs high-speed photo detection, is made on the same chip, no external optical coupling is necessary. The entire structure is integrated and self-consistent, it will find applications in future wireless and space-borne communications.
{"title":"Wideband RF chirp generation using three-section strongly gain-coupled DFB lasers","authors":"R. Hui, S. Taherion, P. Gogineni, C. Allen, D. Adams","doi":"10.1109/LEOS.2001.969298","DOIUrl":"https://doi.org/10.1109/LEOS.2001.969298","url":null,"abstract":"We have demonstrated a miniature microwave chirp generator using a three-section dual-wavelength DFB laser. Because the saturable absorption section, which performs high-speed photo detection, is made on the same chip, no external optical coupling is necessary. The entire structure is integrated and self-consistent, it will find applications in future wireless and space-borne communications.","PeriodicalId":18008,"journal":{"name":"LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242)","volume":"20 1","pages":"308-309 vol.1"},"PeriodicalIF":0.0,"publicationDate":"2001-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81797756","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 : 2001-11-12DOI: 10.1109/LEOS.2001.968994
T. Maia, R. Ribeiro, P. Monteiro
Simulation experiments are used to assess the feasibility of optical SSB systems using self-homodyne detection. The experiments revealed that the electrical waveforms of the drive signals, required by the transmitter modulators, play a critical role on the system performance. Particularly important is the modulation depth. The present study recommends a modulation depth of 0.2 in order to obtain the best performance. The tap delay used in the discrete approximation of the Hilbert filter was also optimized, resulting in a value of 37.5 ps.
{"title":"Impact of the modulation depth on self-homodyne optical single sideband systems","authors":"T. Maia, R. Ribeiro, P. Monteiro","doi":"10.1109/LEOS.2001.968994","DOIUrl":"https://doi.org/10.1109/LEOS.2001.968994","url":null,"abstract":"Simulation experiments are used to assess the feasibility of optical SSB systems using self-homodyne detection. The experiments revealed that the electrical waveforms of the drive signals, required by the transmitter modulators, play a critical role on the system performance. Particularly important is the modulation depth. The present study recommends a modulation depth of 0.2 in order to obtain the best performance. The tap delay used in the discrete approximation of the Hilbert filter was also optimized, resulting in a value of 37.5 ps.","PeriodicalId":18008,"journal":{"name":"LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242)","volume":"17 1","pages":"675-676 vol.2"},"PeriodicalIF":0.0,"publicationDate":"2001-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81904543","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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