Pub Date : 2004-12-27DOI: 10.1109/LTIMC.2004.1370991
C. Mu, A. Daryoush
A custom designed broadband NIR spectroscopy system is reported. A high-speed high power optical transmitter is designed over the frequency range from 100 MHz up to 3 GHz. Phantom experiments are performed to extract optical parameters of a turbid media simulating a breast tissue. Both broadband and single-frequency extraction methods are used to extract optical parameters of the phantom model. The comparison shows that the achieved extraction accuracy of optical parameter (/spl mu//sub a/, /spl mu//sub z/) using broadband extraction method is better than the single frequency technique.
{"title":"Broadband instrumentation for spectroscopy in turbid media using NIR","authors":"C. Mu, A. Daryoush","doi":"10.1109/LTIMC.2004.1370991","DOIUrl":"https://doi.org/10.1109/LTIMC.2004.1370991","url":null,"abstract":"A custom designed broadband NIR spectroscopy system is reported. A high-speed high power optical transmitter is designed over the frequency range from 100 MHz up to 3 GHz. Phantom experiments are performed to extract optical parameters of a turbid media simulating a breast tissue. Both broadband and single-frequency extraction methods are used to extract optical parameters of the phantom model. The comparison shows that the achieved extraction accuracy of optical parameter (/spl mu//sub a/, /spl mu//sub z/) using broadband extraction method is better than the single frequency technique.","PeriodicalId":317707,"journal":{"name":"Proceedings of the Lightwave Technologies in Instrumentation and Measurement Conference, 2004.","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115332015","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 : 2004-12-27DOI: 10.1109/LTIMC.2004.1371000
A. Apsel, A. Pappu, T. Yin
This tutorial paper looks at the possibilities for integrated photonic VLSI systems. It examines the need for "disruptive" technologies to solve the very problems that feature size scaling has introduced in traditional VLSI electronics and the potential for photonics and hybridized systems to solve these problems. It also considers the various challenges involved in constructing a photonic VLSI system as well as the potential pitfalls and disadvantages of this approach. The paper concludes with a discussion of these challenges and benefits by showing steps toward realizing such a system and how addressing problems in computer architecture with an innovative photonics approach can lead to benefits in system wide performance not previously seen with existing approaches.
{"title":"Merging traditional VLSI with photonics","authors":"A. Apsel, A. Pappu, T. Yin","doi":"10.1109/LTIMC.2004.1371000","DOIUrl":"https://doi.org/10.1109/LTIMC.2004.1371000","url":null,"abstract":"This tutorial paper looks at the possibilities for integrated photonic VLSI systems. It examines the need for \"disruptive\" technologies to solve the very problems that feature size scaling has introduced in traditional VLSI electronics and the potential for photonics and hybridized systems to solve these problems. It also considers the various challenges involved in constructing a photonic VLSI system as well as the potential pitfalls and disadvantages of this approach. The paper concludes with a discussion of these challenges and benefits by showing steps toward realizing such a system and how addressing problems in computer architecture with an innovative photonics approach can lead to benefits in system wide performance not previously seen with existing approaches.","PeriodicalId":317707,"journal":{"name":"Proceedings of the Lightwave Technologies in Instrumentation and Measurement Conference, 2004.","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125101156","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 : 2004-12-27DOI: 10.1109/LTIMC.2004.1370997
C. Flueraru, J. Liu, C. Graver
In this letter a multi cross-level density analysis procedure is applied to the dependence of the Stokes vector versus wavelength for DGD calculation. The procedure is similar to the procedure used in fixed analyzer method for average DGD calculation, but it provides a reduced uncertainty. The theoretical model and experimental data are presented.
{"title":"Modified fixed analyzer method for polarization mode dispersion measurement - Investigation and comparison with other techniques","authors":"C. Flueraru, J. Liu, C. Graver","doi":"10.1109/LTIMC.2004.1370997","DOIUrl":"https://doi.org/10.1109/LTIMC.2004.1370997","url":null,"abstract":"In this letter a multi cross-level density analysis procedure is applied to the dependence of the Stokes vector versus wavelength for DGD calculation. The procedure is similar to the procedure used in fixed analyzer method for average DGD calculation, but it provides a reduced uncertainty. The theoretical model and experimental data are presented.","PeriodicalId":317707,"journal":{"name":"Proceedings of the Lightwave Technologies in Instrumentation and Measurement Conference, 2004.","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132797273","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 : 2004-12-27DOI: 10.1109/LTIMC.2004.1370995
B. Szafraniec, D. Baney
Swept coherent optical spectrum analysis is becoming a viable method for high-resolution spectral measurements. This technique is typically used to measure the power spectral density, however, the measurement of the spectral phase of periodically modulated optical signals is also possible. The adjacent spectral peaks are simultaneously observed by a modulated optical local oscillator. Optical mixing translates the phase difference between the adjacent optical spectral peaks to an easily measured low-frequency electrical signal. This process preserves phase relationships. Since the spectral phase is reconstructed from the phase difference between the adjacent spectral peaks, the common mode optical phase noise is cancelled. Simultaneous measurement of the spectral amplitude and phase results in complete characterization of the complex optical field of the modulated optical carrier. Knowledge of the complex optical field allows transformation from the frequency domain to the time domain by means of the inverse Fourier transform. Theoretical background and experimental results are included.
{"title":"Swept coherent spectrum analysis of the complex optical field","authors":"B. Szafraniec, D. Baney","doi":"10.1109/LTIMC.2004.1370995","DOIUrl":"https://doi.org/10.1109/LTIMC.2004.1370995","url":null,"abstract":"Swept coherent optical spectrum analysis is becoming a viable method for high-resolution spectral measurements. This technique is typically used to measure the power spectral density, however, the measurement of the spectral phase of periodically modulated optical signals is also possible. The adjacent spectral peaks are simultaneously observed by a modulated optical local oscillator. Optical mixing translates the phase difference between the adjacent optical spectral peaks to an easily measured low-frequency electrical signal. This process preserves phase relationships. Since the spectral phase is reconstructed from the phase difference between the adjacent spectral peaks, the common mode optical phase noise is cancelled. Simultaneous measurement of the spectral amplitude and phase results in complete characterization of the complex optical field of the modulated optical carrier. Knowledge of the complex optical field allows transformation from the frequency domain to the time domain by means of the inverse Fourier transform. Theoretical background and experimental results are included.","PeriodicalId":317707,"journal":{"name":"Proceedings of the Lightwave Technologies in Instrumentation and Measurement Conference, 2004.","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134171399","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 : 2004-12-27DOI: 10.1109/LTIMC.2004.1371007
J. Faucher, M. Mony, D. Plant
This paper proposes a test setup that can accurately measure the lock acquisition time of conventional and burst mode receivers subjected to phase, frequency, or amplitude steps. This work will be useful to network architects and circuit designers who wish to know with precision how many bits a receiver needs to acquire lock. The technique for measuring lock acquisition time, or preamble length, is based on an acceptable BER for the payload. Measurement results for the lock acquisition time of two commercially available OC-48 receiver chips will be presented.
{"title":"Test setup for optical burst-mode receivers","authors":"J. Faucher, M. Mony, D. Plant","doi":"10.1109/LTIMC.2004.1371007","DOIUrl":"https://doi.org/10.1109/LTIMC.2004.1371007","url":null,"abstract":"This paper proposes a test setup that can accurately measure the lock acquisition time of conventional and burst mode receivers subjected to phase, frequency, or amplitude steps. This work will be useful to network architects and circuit designers who wish to know with precision how many bits a receiver needs to acquire lock. The technique for measuring lock acquisition time, or preamble length, is based on an acceptable BER for the payload. Measurement results for the lock acquisition time of two commercially available OC-48 receiver chips will be presented.","PeriodicalId":317707,"journal":{"name":"Proceedings of the Lightwave Technologies in Instrumentation and Measurement Conference, 2004.","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121198516","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 : 2004-12-27DOI: 10.1109/LTIMC.2004.1370982
M. Bahl, N. Panoiu, R. Osgood
We develop a new approach based on the finite-difference time-domain (FDTD) method for simulating dynamics of modelocked VCSELs. Our FDTD model, transcends the limitation of a widely used traveling-wave technique, and can be used to determine both the sub-wavelength spatial features of the optical field, as well as its temporal dynamics on a sub-cycle time-scale. The thermal effects are included through coupled lattice and plasma temperature equations. The material response is incorporated via the effective Bloch equations. A VCSEL with gain and saturable absorber is simulated and stable modelocking obtained. Fine features of the pulses spatial profile are also studied.
{"title":"Novel optical and thermal modeling for modelocked VCSELs","authors":"M. Bahl, N. Panoiu, R. Osgood","doi":"10.1109/LTIMC.2004.1370982","DOIUrl":"https://doi.org/10.1109/LTIMC.2004.1370982","url":null,"abstract":"We develop a new approach based on the finite-difference time-domain (FDTD) method for simulating dynamics of modelocked VCSELs. Our FDTD model, transcends the limitation of a widely used traveling-wave technique, and can be used to determine both the sub-wavelength spatial features of the optical field, as well as its temporal dynamics on a sub-cycle time-scale. The thermal effects are included through coupled lattice and plasma temperature equations. The material response is incorporated via the effective Bloch equations. A VCSEL with gain and saturable absorber is simulated and stable modelocking obtained. Fine features of the pulses spatial profile are also studied.","PeriodicalId":317707,"journal":{"name":"Proceedings of the Lightwave Technologies in Instrumentation and Measurement Conference, 2004.","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128515028","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 : 2004-12-27DOI: 10.1109/LTIMC.2004.1370983
X. Ji, F. Choa
Thermal design is known to be very important in high-power opto-electronic packaging. Efficient heat removing arrangement can greatly improve the device performance including the maximum output power, which is closely related to the junction and heat sink temperature difference, and the device lifetime, which strongly depends on the built-in thermal stress. A novel double-side heat-removing structure is proposed to reduce the junction and the heat sink temperature difference to a few degree K. Theoretic analysis and simulation results are presented.
{"title":"A novel double-side heat-removing laser structure for very high efficiency and high power lasers","authors":"X. Ji, F. Choa","doi":"10.1109/LTIMC.2004.1370983","DOIUrl":"https://doi.org/10.1109/LTIMC.2004.1370983","url":null,"abstract":"Thermal design is known to be very important in high-power opto-electronic packaging. Efficient heat removing arrangement can greatly improve the device performance including the maximum output power, which is closely related to the junction and heat sink temperature difference, and the device lifetime, which strongly depends on the built-in thermal stress. A novel double-side heat-removing structure is proposed to reduce the junction and the heat sink temperature difference to a few degree K. Theoretic analysis and simulation results are presented.","PeriodicalId":317707,"journal":{"name":"Proceedings of the Lightwave Technologies in Instrumentation and Measurement Conference, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115927680","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 : 2004-12-27DOI: 10.1109/LTIMC.2004.1371003
A. Lay-Ekuakille, A. Scarano, A. Trotta
Image filtering by Richardson-Lucy algorithm shows an iterative solution for monodimensional signal deconvolution. In this paper the performance of this algorithm will be verified when lidar (light detection and ranging) signals are pre-filtered by an adaptive low-pass filter followed by a couple of ner/nerd filters. Most interesting results, for real-time deconvolution and filtering of lidar signal, will be also showed.
{"title":"Signal deconvolution with successive filterings","authors":"A. Lay-Ekuakille, A. Scarano, A. Trotta","doi":"10.1109/LTIMC.2004.1371003","DOIUrl":"https://doi.org/10.1109/LTIMC.2004.1371003","url":null,"abstract":"Image filtering by Richardson-Lucy algorithm shows an iterative solution for monodimensional signal deconvolution. In this paper the performance of this algorithm will be verified when lidar (light detection and ranging) signals are pre-filtered by an adaptive low-pass filter followed by a couple of ner/nerd filters. Most interesting results, for real-time deconvolution and filtering of lidar signal, will be also showed.","PeriodicalId":317707,"journal":{"name":"Proceedings of the Lightwave Technologies in Instrumentation and Measurement Conference, 2004.","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122193777","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 : 2004-10-19DOI: 10.1109/LTIMC.2004.1371005
F. Daou, R. O'Dowd
Testing optical transponders for multi gigabit rate is demanding but to do so for production volumes requires novel approaches to high-speed data verification and processing is at the limits of instrument technology. Conventional sampling oscilloscopes are limited in such volume-production environment, and their ability to process data by virtue of digital signal processing DSP. Digital signal processing of sampled data is possible when the sampling rate is greater than twice the spectral content in the signal, this is not possible to perform for multi gigabit rate signals, based on the physical limitations of the today's state of the art sampling technology that uses e.g., gallium arsenide semiconductor technology. In the vector sampling method developed here, the amplitude, phase, and history of each sample are used to reconstruct the original signal and enable digital processing of various parameters of the signal that include jitter, spectral characteristics, digital low pass filtering for specific bit rate, and other critical parameters that affect the quality of signal transmission and the error rate. The reconstructed waveform in continuous discrete time enables are then processed and enable the same measurement capabilities of high speed sampling scopes with the advantage of the higher bandwidth. Performance examples of various test functions of jitter and eye diagrams will be given for comparison with conventional techniques.
{"title":"Optical transponder test for multi gigabit rate","authors":"F. Daou, R. O'Dowd","doi":"10.1109/LTIMC.2004.1371005","DOIUrl":"https://doi.org/10.1109/LTIMC.2004.1371005","url":null,"abstract":"Testing optical transponders for multi gigabit rate is demanding but to do so for production volumes requires novel approaches to high-speed data verification and processing is at the limits of instrument technology. Conventional sampling oscilloscopes are limited in such volume-production environment, and their ability to process data by virtue of digital signal processing DSP. Digital signal processing of sampled data is possible when the sampling rate is greater than twice the spectral content in the signal, this is not possible to perform for multi gigabit rate signals, based on the physical limitations of the today's state of the art sampling technology that uses e.g., gallium arsenide semiconductor technology. In the vector sampling method developed here, the amplitude, phase, and history of each sample are used to reconstruct the original signal and enable digital processing of various parameters of the signal that include jitter, spectral characteristics, digital low pass filtering for specific bit rate, and other critical parameters that affect the quality of signal transmission and the error rate. The reconstructed waveform in continuous discrete time enables are then processed and enable the same measurement capabilities of high speed sampling scopes with the advantage of the higher bandwidth. Performance examples of various test functions of jitter and eye diagrams will be given for comparison with conventional techniques.","PeriodicalId":317707,"journal":{"name":"Proceedings of the Lightwave Technologies in Instrumentation and Measurement Conference, 2004.","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122934520","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：