Pub Date : 2013-12-01DOI: 10.1109/WRAP.2013.6917620
M. Bahl, P. Senthilkumaran
We present a technique to determine the charge of a complex amplitude by extracting its Fourier-Bessel descriptors. The Cartesian signal is transformed to the polar frequency domain through the Fourier-Bessel Transform and analyzed.
{"title":"Unfolding the topological charge of a complex field through its Fourier-Bessel Transform","authors":"M. Bahl, P. Senthilkumaran","doi":"10.1109/WRAP.2013.6917620","DOIUrl":"https://doi.org/10.1109/WRAP.2013.6917620","url":null,"abstract":"We present a technique to determine the charge of a complex amplitude by extracting its Fourier-Bessel descriptors. The Cartesian signal is transformed to the polar frequency domain through the Fourier-Bessel Transform and analyzed.","PeriodicalId":386455,"journal":{"name":"Workshop on Recent Advances in Photonics (WRAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124861013","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 : 2013-12-01DOI: 10.1109/WRAP.2013.6917695
K. Nithyanandan, T. Uthayakumar, K. Porsezian, R. Raja
We report a novel two state behavior in the Modulational Instability (MI) induced Supercontinuum Generation (SCG) in the exponential saturable nonlinearity (ESN). We identified the unique behavior of SCG in the ESN system, unlike the case of Kerr type nonlinearity, where the nonlinearity monotonously increases with power, in the case ESN, the effective nonlinearity follows in a unique such that there exist two different power at which the nonlinearity register same value. Because of which, an identical spectrum is observed at two different powers (i,e) input power (P) above and below saturation power (Ps). This we report as the two state behavior.
{"title":"Observation of two state behavior in the Instability induced Supercontinuum Generation of exponential saturable nonlinearity","authors":"K. Nithyanandan, T. Uthayakumar, K. Porsezian, R. Raja","doi":"10.1109/WRAP.2013.6917695","DOIUrl":"https://doi.org/10.1109/WRAP.2013.6917695","url":null,"abstract":"We report a novel two state behavior in the Modulational Instability (MI) induced Supercontinuum Generation (SCG) in the exponential saturable nonlinearity (ESN). We identified the unique behavior of SCG in the ESN system, unlike the case of Kerr type nonlinearity, where the nonlinearity monotonously increases with power, in the case ESN, the effective nonlinearity follows in a unique such that there exist two different power at which the nonlinearity register same value. Because of which, an identical spectrum is observed at two different powers (i,e) input power (P) above and below saturation power (Ps). This we report as the two state behavior.","PeriodicalId":386455,"journal":{"name":"Workshop on Recent Advances in Photonics (WRAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124212948","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 : 2013-12-01DOI: 10.1109/WRAP.2013.6917696
R. Raja, K. Nithyanandan, T. Uthayakumar, K. Porsezian
A theoretical study of modulational instability (MI) in the semiconductor doped dispersion decreasing (SD-DDF) fiber is presented. We consider the combination of saturation of nonlinear response (SNL) and the dispersion decreasing fiber (DDF). The two extreme physical effects considered lead to exciting outcome, where decreasing dispersion leads to broadening the spectral width and saturation on the other hand suppresses the bandwidth. We proposed that instead of using DDF whose bandwidth is limited by the manufacturing constraints, the use of SD-DDF offers better tailoring of the bandwidth profile by suitably altering the power.
{"title":"Supercontinuum generation in the novel semiconductor doped dispersion decreasing fiber","authors":"R. Raja, K. Nithyanandan, T. Uthayakumar, K. Porsezian","doi":"10.1109/WRAP.2013.6917696","DOIUrl":"https://doi.org/10.1109/WRAP.2013.6917696","url":null,"abstract":"A theoretical study of modulational instability (MI) in the semiconductor doped dispersion decreasing (SD-DDF) fiber is presented. We consider the combination of saturation of nonlinear response (SNL) and the dispersion decreasing fiber (DDF). The two extreme physical effects considered lead to exciting outcome, where decreasing dispersion leads to broadening the spectral width and saturation on the other hand suppresses the bandwidth. We proposed that instead of using DDF whose bandwidth is limited by the manufacturing constraints, the use of SD-DDF offers better tailoring of the bandwidth profile by suitably altering the power.","PeriodicalId":386455,"journal":{"name":"Workshop on Recent Advances in Photonics (WRAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116234671","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 : 2013-12-01DOI: 10.1109/WRAP.2013.6917665
S. Dey, S. Singh
We study coherent perfect absorption in a metal-dielectric composite slab with bi-directional illumination using Gaussian beams. We show that CPA is possible with broader Gaussian beams, while tightly focused beams lead to incomplete absorption.
{"title":"Coherent perfect absorption with Gaussian beams","authors":"S. Dey, S. Singh","doi":"10.1109/WRAP.2013.6917665","DOIUrl":"https://doi.org/10.1109/WRAP.2013.6917665","url":null,"abstract":"We study coherent perfect absorption in a metal-dielectric composite slab with bi-directional illumination using Gaussian beams. We show that CPA is possible with broader Gaussian beams, while tightly focused beams lead to incomplete absorption.","PeriodicalId":386455,"journal":{"name":"Workshop on Recent Advances in Photonics (WRAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122279871","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 : 2013-12-01DOI: 10.1109/WRAP.2013.6917630
N. Sharma, K. Mishra, S. K. Kamilla, J. K. Sharma
The modulation of a periodic object with infinitely thin lines by a human eye in presence of Stiles-Crawford effect of the first kind is insensitive to coherent illumination.
在第一类斯蒂尔斯-克劳福德效应存在下，人眼对具有无限细线的周期性物体的调制对相干照明不敏感。
{"title":"Performance of a human eye in coherent illumination","authors":"N. Sharma, K. Mishra, S. K. Kamilla, J. K. Sharma","doi":"10.1109/WRAP.2013.6917630","DOIUrl":"https://doi.org/10.1109/WRAP.2013.6917630","url":null,"abstract":"The modulation of a periodic object with infinitely thin lines by a human eye in presence of Stiles-Crawford effect of the first kind is insensitive to coherent illumination.","PeriodicalId":386455,"journal":{"name":"Workshop on Recent Advances in Photonics (WRAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132129464","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 : 2013-12-01DOI: 10.1109/WRAP.2013.6917678
O. P. Naraniya, M. R. Shenoy, K. Thyagarajan
We show that in ns OPOs, significant improvement in pump conversion efficiency can be achieved by using a double-rectangular pump pulse with soft-edge top-hat (SETH) spatial profile, instead of a Gaussian pulse.
{"title":"Efficiency improvement in optical parametric oscillators by using pump pulses of optimum temporal and spatial profiles","authors":"O. P. Naraniya, M. R. Shenoy, K. Thyagarajan","doi":"10.1109/WRAP.2013.6917678","DOIUrl":"https://doi.org/10.1109/WRAP.2013.6917678","url":null,"abstract":"We show that in ns OPOs, significant improvement in pump conversion efficiency can be achieved by using a double-rectangular pump pulse with soft-edge top-hat (SETH) spatial profile, instead of a Gaussian pulse.","PeriodicalId":386455,"journal":{"name":"Workshop on Recent Advances in Photonics (WRAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114998923","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 : 2013-12-01DOI: 10.1109/WRAP.2013.6917666
U. M. Roy, S. Malathi, G. Kadambi
Analytical and simulation studies on influence of Butt-coupling co-efficient on the shift in resonance of Optical Micro-Ring Resonator with gap between the straight and curved waveguides less than 15 nm are presented.
{"title":"Analytical study on the Butt-coupling co-efficient for the Optical Micro-Ring Resonator","authors":"U. M. Roy, S. Malathi, G. Kadambi","doi":"10.1109/WRAP.2013.6917666","DOIUrl":"https://doi.org/10.1109/WRAP.2013.6917666","url":null,"abstract":"Analytical and simulation studies on influence of Butt-coupling co-efficient on the shift in resonance of Optical Micro-Ring Resonator with gap between the straight and curved waveguides less than 15 nm are presented.","PeriodicalId":386455,"journal":{"name":"Workshop on Recent Advances in Photonics (WRAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116388953","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 : 2013-12-01DOI: 10.1109/WRAP.2013.6917644
E. Sharma, J. Anand
A coaxial fiber of chosen length, supporting two symmetric modes (LP01 and LP02), excited by periodic sequence of Gaussian temporal light pulses of chosen repetition rate, regenerates original pulse sequence -“Talbot Effect” in time domain.
{"title":"Regeneration of Gaussian temporal pulse sequence in a coaxial optical fiber - Occurrence of ‘Talbot Effect’ in time domain","authors":"E. Sharma, J. Anand","doi":"10.1109/WRAP.2013.6917644","DOIUrl":"https://doi.org/10.1109/WRAP.2013.6917644","url":null,"abstract":"A coaxial fiber of chosen length, supporting two symmetric modes (LP<sub>01</sub> and LP<sub>02</sub>), excited by periodic sequence of Gaussian temporal light pulses of chosen repetition rate, regenerates original pulse sequence -“Talbot Effect” in time domain.","PeriodicalId":386455,"journal":{"name":"Workshop on Recent Advances in Photonics (WRAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122003944","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 : 2013-12-01DOI: 10.1109/WRAP.2013.6917634
Preeti Rani, Y. Kalra, R. Sinha, Himanshu Chauhan
A highly sensitive Micro-Displacement Sensor design consisting of 2D hexagonal PCWG arrangement of moving and fixed waveguides is created and its sensitivity is numerically simulated and estimated to be >1.5μm-1.
{"title":"Design of a highly sensitive Micro-Displacement Sensor based on photonic crystal waveguides","authors":"Preeti Rani, Y. Kalra, R. Sinha, Himanshu Chauhan","doi":"10.1109/WRAP.2013.6917634","DOIUrl":"https://doi.org/10.1109/WRAP.2013.6917634","url":null,"abstract":"A highly sensitive Micro-Displacement Sensor design consisting of 2D hexagonal PCWG arrangement of moving and fixed waveguides is created and its sensitivity is numerically simulated and estimated to be >1.5μm-1.","PeriodicalId":386455,"journal":{"name":"Workshop on Recent Advances in Photonics (WRAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122146961","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 : 2013-12-01DOI: 10.1109/WRAP.2013.6917632
A. Barh, R. Varshney, B. Pal, S. Ghosh
All-fiber design approach for temporal parabolic pulse (PP) generation through a very short length of tapered microstructured optical fiber (MOF) is proposed. A length of just ~ 20 cm of designed MOF is shown to yield PP for a Gaussian input at 2 μm wavelength.
{"title":"Exploiting microstructured optical fiber platform for generating temporal parabolic pulse","authors":"A. Barh, R. Varshney, B. Pal, S. Ghosh","doi":"10.1109/WRAP.2013.6917632","DOIUrl":"https://doi.org/10.1109/WRAP.2013.6917632","url":null,"abstract":"All-fiber design approach for temporal parabolic pulse (PP) generation through a very short length of tapered microstructured optical fiber (MOF) is proposed. A length of just ~ 20 cm of designed MOF is shown to yield PP for a Gaussian input at 2 μm wavelength.","PeriodicalId":386455,"journal":{"name":"Workshop on Recent Advances in Photonics (WRAP)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130107034","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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