Pub Date : 2010-12-01DOI: 10.1142/S1793528810000050
K. Mukherjee
Among all the optical encoding techniques, hybrid encoding technique is the most advantageous not only for its simplicity, but also because it reduces the hardware complexity, and all optical devices can be developed using simple principles like difference frequency generation only. The technique is utilized to develop devices like half adder, half subtractor and full adder for all optical computation. The working of these devices is based on simply difference frequency generation in nonlinear materials. The beauty of this computation method lies in its simplicity and mainly in encoding mechanism of the binary bits.
{"title":"IMPLEMENTATION OF HYBRID ENCODED ALL OPTICAL COMPUTATION USING NONLINEAR MATERIAL BASED DIFFERENCE FREQUENCY GENERATION ALONE","authors":"K. Mukherjee","doi":"10.1142/S1793528810000050","DOIUrl":"https://doi.org/10.1142/S1793528810000050","url":null,"abstract":"Among all the optical encoding techniques, hybrid encoding technique is the most advantageous not only for its simplicity, but also because it reduces the hardware complexity, and all optical devices can be developed using simple principles like difference frequency generation only. The technique is utilized to develop devices like half adder, half subtractor and full adder for all optical computation. The working of these devices is based on simply difference frequency generation in nonlinear materials. The beauty of this computation method lies in its simplicity and mainly in encoding mechanism of the binary bits.","PeriodicalId":106270,"journal":{"name":"Optics and Photonics Letters","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114766630","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 : 2010-12-01DOI: 10.1142/S1793528810000098
R. Khordad, A. Bijanzadeh
A Bis-Nickel passively Q-switched Nd:YAG laser is experimentally studied. According to the obtained results for the laser output energy, we found that: (i) the laser output energy has a step by step behavior. (ii) In any step, the output energy has approximately constant value. (iii) The highest output energy is obtained from lowest initial transmission in this work. (iv) As the initial transmission decreases, the laser output energy increases. We deduced to increase the single pulse energy, a Q-switch with lower initial transmission should be used. Apparently, this behavior is true in the passive Q-switches.
{"title":"STUDY OF OUTPUT ENERGY OF BIS-NICKEL PASSIVELY Q-SWITCHED Nd:YAG LASER","authors":"R. Khordad, A. Bijanzadeh","doi":"10.1142/S1793528810000098","DOIUrl":"https://doi.org/10.1142/S1793528810000098","url":null,"abstract":"A Bis-Nickel passively Q-switched Nd:YAG laser is experimentally studied. According to the obtained results for the laser output energy, we found that: (i) the laser output energy has a step by step behavior. (ii) In any step, the output energy has approximately constant value. (iii) The highest output energy is obtained from lowest initial transmission in this work. (iv) As the initial transmission decreases, the laser output energy increases. We deduced to increase the single pulse energy, a Q-switch with lower initial transmission should be used. Apparently, this behavior is true in the passive Q-switches.","PeriodicalId":106270,"journal":{"name":"Optics and Photonics Letters","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131773171","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 : 2010-12-01DOI: 10.1142/S1793528810000062
Bikash Chakraborty, S. Mukhopadhyay
A complete analytical model of all optical half adder and full adder is proposed based on phase encoding. This architecture consists of numbers of optical coherent mixers and mirrors. Optical switches are used only in the encoding of inputs, but no such switches are used in the processing part. So real time operation based on this proposed encoding may be achieved. The output of the system always carries the same intensity and therefore it is suitable for using in a combinational and sequential logic system.
{"title":"A METHOD OF IMPLEMENTING PHASE ENCODED OPTICAL HALF ADDER AND FULL ADDER SYSTEM","authors":"Bikash Chakraborty, S. Mukhopadhyay","doi":"10.1142/S1793528810000062","DOIUrl":"https://doi.org/10.1142/S1793528810000062","url":null,"abstract":"A complete analytical model of all optical half adder and full adder is proposed based on phase encoding. This architecture consists of numbers of optical coherent mixers and mirrors. Optical switches are used only in the encoding of inputs, but no such switches are used in the processing part. So real time operation based on this proposed encoding may be achieved. The output of the system always carries the same intensity and therefore it is suitable for using in a combinational and sequential logic system.","PeriodicalId":106270,"journal":{"name":"Optics and Photonics Letters","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115093748","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 : 2010-12-01DOI: 10.1142/S1793528810000116
N. Mitra, S. Mukhopadhyay
In digital up gradation of optical processor, it is often required to count the number of optical pulses with all-optical systems. Hence to count the optical pulse, one requires an all-optical counter for very fast counting. In this communication, the authors propose a new scheme for developing an all-optical synchronous counter. Synchronous counter can show faster speed than that of a ripple counter in conventional electronic system. The proposed counter part of electronic synchronization is expected faster speed of operation, as optics has been used here as an information carrying signal in place of electronics. Again the switches are also run by optical switches.
{"title":"METHOD OF DEVELOPING AN ALL-OPTICAL SYNCHRONOUS COUNTER BY EXPLOITING THE KERR NONLINEARITY OF THE MEDIUM","authors":"N. Mitra, S. Mukhopadhyay","doi":"10.1142/S1793528810000116","DOIUrl":"https://doi.org/10.1142/S1793528810000116","url":null,"abstract":"In digital up gradation of optical processor, it is often required to count the number of optical pulses with all-optical systems. Hence to count the optical pulse, one requires an all-optical counter for very fast counting. In this communication, the authors propose a new scheme for developing an all-optical synchronous counter. Synchronous counter can show faster speed than that of a ripple counter in conventional electronic system. The proposed counter part of electronic synchronization is expected faster speed of operation, as optics has been used here as an information carrying signal in place of electronics. Again the switches are also run by optical switches.","PeriodicalId":106270,"journal":{"name":"Optics and Photonics Letters","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132788819","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 : 2009-12-01DOI: 10.1142/S1793528809000040
Yun Zeng, Hai-Qing Xie, Wei‐Qing Huang, Guo-Liang Zhang, Taihong Wang
A novel photoelectric device-Lateral PIN photodiode gated by a transparent electrode (LPIN PD-GTE) fabricated on SOI film is proposed. Its physical model is presented based on standard semiconductor equations. In this device, recombination of carriers is ignored due to its operation in depletion region and high electric field strength (E > 1 × 104V/m). Numerical calculation indicates that LPIN PD-GTE has high sensitivity and SNR (Signal to Noise Ratio). This model allows one to predict and optimize the photoelectric characteristics of LPIN PD-GTE.
{"title":"PHYSICAL MODEL OF LATERAL PIN PHOTODIODE GATED BY A TRANSPARENT ELECTRODE FABRICATED ON SOI FILM","authors":"Yun Zeng, Hai-Qing Xie, Wei‐Qing Huang, Guo-Liang Zhang, Taihong Wang","doi":"10.1142/S1793528809000040","DOIUrl":"https://doi.org/10.1142/S1793528809000040","url":null,"abstract":"A novel photoelectric device-Lateral PIN photodiode gated by a transparent electrode (LPIN PD-GTE) fabricated on SOI film is proposed. Its physical model is presented based on standard semiconductor equations. In this device, recombination of carriers is ignored due to its operation in depletion region and high electric field strength (E > 1 × 104V/m). Numerical calculation indicates that LPIN PD-GTE has high sensitivity and SNR (Signal to Noise Ratio). This model allows one to predict and optimize the photoelectric characteristics of LPIN PD-GTE.","PeriodicalId":106270,"journal":{"name":"Optics and Photonics Letters","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125390405","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 : 2008-12-01DOI: 10.1142/S1793528808000021
A. Biswas, E. Zerrad
This paper studies optical solitons in 1 + 2 dimensions with power law nonlinearity in the presence of time-dependent coefficients of dispersion, nonlinearity and attenuation. The one-soliton solution to the governing nonlinear Schrodinger equation is obtained and the constraint relation between these coefficients is consequently established. The velocity of the soliton is also obtained in terms of these coefficients. These time-dependent coefficients, which must be Riemann-integrable, are otherwise arbitrary.
{"title":"OPTICAL SOLITONS IN 1 + 2 DIMENSIONS WITH TIME-DEPENDENT DISPERSION, NONLINEARITY AND ATTENUATION IN A POWER LAW MEDIUM","authors":"A. Biswas, E. Zerrad","doi":"10.1142/S1793528808000021","DOIUrl":"https://doi.org/10.1142/S1793528808000021","url":null,"abstract":"This paper studies optical solitons in 1 + 2 dimensions with power law nonlinearity in the presence of time-dependent coefficients of dispersion, nonlinearity and attenuation. The one-soliton solution to the governing nonlinear Schrodinger equation is obtained and the constraint relation between these coefficients is consequently established. The velocity of the soliton is also obtained in terms of these coefficients. These time-dependent coefficients, which must be Riemann-integrable, are otherwise arbitrary.","PeriodicalId":106270,"journal":{"name":"Optics and Photonics Letters","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125707424","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 : 2008-12-01DOI: 10.1142/S1793528808000033
Y. Cao, J. Schenk, M. Fiddy
We describe the properties of a 1D anisotropic periodic structure, designed to have a band edge with fourth order degeneracy, called a degenerate band edge (DBE). A giant field resonance at the transmission peak frequency closest to this band edge has been verified by rigorous numerical calculation and is supported by experimental evidence. Simulations are presented of the consequences of a χ3 nonlinear index change at a DBE resonant frequency which can provide all-optical switching and transmission self-limiting.
{"title":"THIRD ORDER NONLINEAR EFFECT NEAR A DEGENERATE BAND EDGE","authors":"Y. Cao, J. Schenk, M. Fiddy","doi":"10.1142/S1793528808000033","DOIUrl":"https://doi.org/10.1142/S1793528808000033","url":null,"abstract":"We describe the properties of a 1D anisotropic periodic structure, designed to have a band edge with fourth order degeneracy, called a degenerate band edge (DBE). A giant field resonance at the transmission peak frequency closest to this band edge has been verified by rigorous numerical calculation and is supported by experimental evidence. Simulations are presented of the consequences of a χ3 nonlinear index change at a DBE resonant frequency which can provide all-optical switching and transmission self-limiting.","PeriodicalId":106270,"journal":{"name":"Optics and Photonics Letters","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122957030","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 : 1900-01-01DOI: 10.1142/S1793528812500013
W. D. Tan, D. Tang, J. Zhang, D. Shen, X. Xu, J. Xu
The authors report on the dissipative soliton operation of a diode pumped Yb3+:Sc2SiO5 (Yb:SSO) laser in the vicinity of the zero group velocity dispersion (GVD). It is found that the soliton shaping in the laser is dominated by the third-order dispersion (TOD) of the cavity as reflected by the appearance of an asymmetrical spectral sideband in the soliton spectrum. Soliton pulses as short as 93 fs have been obtained in the laser. The authors show that the shortest soliton pulse achievable in the laser is limited by the cavity induced soliton instability, rather than the Kelly spectral sideband formation.
{"title":"DISSIPATIVE SOLITON OPERATION OF AN Yb3+:Sc2SiO5 LASER IN THE VICINITY OF ZERO GROUP VELOCITY DISPERSION","authors":"W. D. Tan, D. Tang, J. Zhang, D. Shen, X. Xu, J. Xu","doi":"10.1142/S1793528812500013","DOIUrl":"https://doi.org/10.1142/S1793528812500013","url":null,"abstract":"The authors report on the dissipative soliton operation of a diode pumped Yb3+:Sc2SiO5 (Yb:SSO) laser in the vicinity of the zero group velocity dispersion (GVD). It is found that the soliton shaping in the laser is dominated by the third-order dispersion (TOD) of the cavity as reflected by the appearance of an asymmetrical spectral sideband in the soliton spectrum. Soliton pulses as short as 93 fs have been obtained in the laser. The authors show that the shortest soliton pulse achievable in the laser is limited by the cavity induced soliton instability, rather than the Kelly spectral sideband formation.","PeriodicalId":106270,"journal":{"name":"Optics and Photonics Letters","volume":"1412 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121717926","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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