Pub Date : 2020-09-09DOI: 10.1109/ICOP49690.2020.9300310
R. Ranjan, M. Ferrara, L. Sirleto
“Noise” of lasers is a short term for random fluctuations of various output parameters, which can play a fundamental role in many applications. In non-linear optical microscopy, the laser beam properties can influence the non-linear contrast efficiency and the image quality. Therefore, laser noise effects should be reduced to acceptable levels.In Stimulated Raman Scattering (SRS) microscopy, two synchronized trains of femtosecond pulses with independent tunability over a wide spectral range are required. The high performance of the SRS imaging requires a reduction of the relative intensity noise (RIN) and timing jitter between these two synchronized pulses trains.In this paper, relative intensity noise (RIN) of the two femtosecond laser sources, in our case a Ti:Sapphire (Ti:Sa) oscillator and a femtosecond synchronized optical parametric oscillator (OPO) are measured.
{"title":"Relative intensity noise measurement of femtosecond laser beams in SRS microscope","authors":"R. Ranjan, M. Ferrara, L. Sirleto","doi":"10.1109/ICOP49690.2020.9300310","DOIUrl":"https://doi.org/10.1109/ICOP49690.2020.9300310","url":null,"abstract":"“Noise” of lasers is a short term for random fluctuations of various output parameters, which can play a fundamental role in many applications. In non-linear optical microscopy, the laser beam properties can influence the non-linear contrast efficiency and the image quality. Therefore, laser noise effects should be reduced to acceptable levels.In Stimulated Raman Scattering (SRS) microscopy, two synchronized trains of femtosecond pulses with independent tunability over a wide spectral range are required. The high performance of the SRS imaging requires a reduction of the relative intensity noise (RIN) and timing jitter between these two synchronized pulses trains.In this paper, relative intensity noise (RIN) of the two femtosecond laser sources, in our case a Ti:Sapphire (Ti:Sa) oscillator and a femtosecond synchronized optical parametric oscillator (OPO) are measured.","PeriodicalId":131383,"journal":{"name":"2020 Italian Conference on Optics and Photonics (ICOP)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114024111","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 : 2020-09-09DOI: 10.1109/ICOP49690.2020.9300333
L. Sansone, M. Pannico, P. Musto, S. Campopiano, M. Giordano, A. Iadicicco
This work explores metal-dielectric colloidal crystal (MDCC) structures as SERS sensing layer. The MDCCs are fabricated directly onto optical fiber tip surface by successive depositions of PS Colloidal Crystal (CC) and Au NanoParticles. The fiber device is explored as remote SERS probe in optrode configuration. The MDCC permits to combine localized surface plasmon resonance (LSPR) of noble metallic nanoparticles and photonic bandgap (PBG) of colloidal type photonic crystals (PhCs). For the sensing test, the fiber probes were immersed in a 100μM aqueous solution of Rhodamine (R6G). Then, preliminary SERS results were retrieved by a Labspec Aramis confocal Raman spectrometer.
{"title":"Optical Fiber Tip Functionalized by Colloidal Photonic Crystal and Gold Nano-Particles for SERS Sensing","authors":"L. Sansone, M. Pannico, P. Musto, S. Campopiano, M. Giordano, A. Iadicicco","doi":"10.1109/ICOP49690.2020.9300333","DOIUrl":"https://doi.org/10.1109/ICOP49690.2020.9300333","url":null,"abstract":"This work explores metal-dielectric colloidal crystal (MDCC) structures as SERS sensing layer. The MDCCs are fabricated directly onto optical fiber tip surface by successive depositions of PS Colloidal Crystal (CC) and Au NanoParticles. The fiber device is explored as remote SERS probe in optrode configuration. The MDCC permits to combine localized surface plasmon resonance (LSPR) of noble metallic nanoparticles and photonic bandgap (PBG) of colloidal type photonic crystals (PhCs). For the sensing test, the fiber probes were immersed in a 100μM aqueous solution of Rhodamine (R6G). Then, preliminary SERS results were retrieved by a Labspec Aramis confocal Raman spectrometer.","PeriodicalId":131383,"journal":{"name":"2020 Italian Conference on Optics and Photonics (ICOP)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125702821","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 : 2020-09-09DOI: 10.1109/ICOP49690.2020.9300327
F. Bastianini, P. Bocheński, R. Di Sante, F. Falcetelli, L. Rossi, G. Bolognini
A novel strain transfer model for surface-bonded sensing cables with multilayered structure is developed and validated experimentally on two surface-mounted cable prototypes with three different bonding lengths and five load cases, demonstrating the capability of the model to predict the strain profile.
{"title":"Strain Transfer Estimation for Complex Surface-Bonded Optical Fibers in Distributed Sensing Applications","authors":"F. Bastianini, P. Bocheński, R. Di Sante, F. Falcetelli, L. Rossi, G. Bolognini","doi":"10.1109/ICOP49690.2020.9300327","DOIUrl":"https://doi.org/10.1109/ICOP49690.2020.9300327","url":null,"abstract":"A novel strain transfer model for surface-bonded sensing cables with multilayered structure is developed and validated experimentally on two surface-mounted cable prototypes with three different bonding lengths and five load cases, demonstrating the capability of the model to predict the strain profile.","PeriodicalId":131383,"journal":{"name":"2020 Italian Conference on Optics and Photonics (ICOP)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133498718","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 : 2020-09-09DOI: 10.1109/ICOP49690.2020.9300328
Haoyi Wang, P. Torres-Ferrera, V. Ferrero, A. Pagano, R. Mercinelli, R. Gaudino
Next generation PON targeting 50 Gbit/s/lambda (50G-PON) based on intensity modulation and direct detection (IM-DD) will likely be under strong bandwidth limitations. We present a PAM-2 and Electrical DuoBinary performance analysis of 50 Gbps PON system by using 25G and 50G transceivers technology with several optical receiver architectures and study of the adaptive equalization impact.
{"title":"Current Trends towards PON systems at 50+ Gbps","authors":"Haoyi Wang, P. Torres-Ferrera, V. Ferrero, A. Pagano, R. Mercinelli, R. Gaudino","doi":"10.1109/ICOP49690.2020.9300328","DOIUrl":"https://doi.org/10.1109/ICOP49690.2020.9300328","url":null,"abstract":"Next generation PON targeting 50 Gbit/s/lambda (50G-PON) based on intensity modulation and direct detection (IM-DD) will likely be under strong bandwidth limitations. We present a PAM-2 and Electrical DuoBinary performance analysis of 50 Gbps PON system by using 25G and 50G transceivers technology with several optical receiver architectures and study of the adaptive equalization impact.","PeriodicalId":131383,"journal":{"name":"2020 Italian Conference on Optics and Photonics (ICOP)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115232922","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 : 2020-09-09DOI: 10.1109/ICOP49690.2020.9300340
G. Coppola, M. Ferrara
A new, simple digital holography-based polarization microscope for birefringence imaging of biological cells is presented. This approach could open the way to a new class of label-free diagnostic tool in biological and medical research and diagnosis.
{"title":"A Polarized Digital Holographic Approach in Biological and Medical Research","authors":"G. Coppola, M. Ferrara","doi":"10.1109/ICOP49690.2020.9300340","DOIUrl":"https://doi.org/10.1109/ICOP49690.2020.9300340","url":null,"abstract":"A new, simple digital holography-based polarization microscope for birefringence imaging of biological cells is presented. This approach could open the way to a new class of label-free diagnostic tool in biological and medical research and diagnosis.","PeriodicalId":131383,"journal":{"name":"2020 Italian Conference on Optics and Photonics (ICOP)","volume":"213 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121549793","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 : 2020-09-09DOI: 10.1109/ICOP49690.2020.9300325
R. Ranjan, M. Ferrara, L. Sirleto
Ultrafast lasers are increasing their range of applications. In non-linear optical microscopy, the laser beam properties can influence the non-linear contrast efficiency and the image quality, so monitoring of the output waveform is often required.In order to obtain images, in Stimulated Raman Scattering (SRS) microscopy, two collinear laser beams, a high-power pump laser and a low power Stokes laser with different frequencies (ωL> ωS) are focused into a sample. In this paper the two laser sources, in our case a femtosecond Ti:Sapphire (Ti:Sa) oscillator and a femtosecond synchronized optical parametric oscillator (OPO) are characterized by non-linear interferometric measurements. Taking advantage of two-photon absorption (TPA), autocorrelation measurements of each laser beam and cross correlation measurements of Ti:Sa and OPO are carried out. Results are reported and discussed.
{"title":"Auto and cross correlation measurements of femtosecond laser beams in SRS microscope","authors":"R. Ranjan, M. Ferrara, L. Sirleto","doi":"10.1109/ICOP49690.2020.9300325","DOIUrl":"https://doi.org/10.1109/ICOP49690.2020.9300325","url":null,"abstract":"Ultrafast lasers are increasing their range of applications. In non-linear optical microscopy, the laser beam properties can influence the non-linear contrast efficiency and the image quality, so monitoring of the output waveform is often required.In order to obtain images, in Stimulated Raman Scattering (SRS) microscopy, two collinear laser beams, a high-power pump laser and a low power Stokes laser with different frequencies (ωL> ωS) are focused into a sample. In this paper the two laser sources, in our case a femtosecond Ti:Sapphire (Ti:Sa) oscillator and a femtosecond synchronized optical parametric oscillator (OPO) are characterized by non-linear interferometric measurements. Taking advantage of two-photon absorption (TPA), autocorrelation measurements of each laser beam and cross correlation measurements of Ti:Sa and OPO are carried out. Results are reported and discussed.","PeriodicalId":131383,"journal":{"name":"2020 Italian Conference on Optics and Photonics (ICOP)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121692191","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 : 2020-09-09DOI: 10.1109/ICOP49690.2020.9300341
Marta Buffa, A. Morea, F. Poli, A. Paparella
Traffic requests are becoming more heterogeneous and dynamic causing the so-called spectrum fragmentation. We propose a reactive defragmentation algorithm to mitigate this issue which degrades the network performance. Three strategies are suggested to compact the spectrum comb, taking into account the minimization of the disrupted services and their reconfiguration times. An accurate Rerouting strategy allows the set-up of a higher amount of traffic, obtaining more capacitive networks.
{"title":"A new Defragmentation Algorithm for Dynamic Optical Networks","authors":"Marta Buffa, A. Morea, F. Poli, A. Paparella","doi":"10.1109/ICOP49690.2020.9300341","DOIUrl":"https://doi.org/10.1109/ICOP49690.2020.9300341","url":null,"abstract":"Traffic requests are becoming more heterogeneous and dynamic causing the so-called spectrum fragmentation. We propose a reactive defragmentation algorithm to mitigate this issue which degrades the network performance. Three strategies are suggested to compact the spectrum comb, taking into account the minimization of the disrupted services and their reconfiguration times. An accurate Rerouting strategy allows the set-up of a higher amount of traffic, obtaining more capacitive networks.","PeriodicalId":131383,"journal":{"name":"2020 Italian Conference on Optics and Photonics (ICOP)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122771639","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 : 2020-09-09DOI: 10.1109/ICOP49690.2020.9300321
G. Marcon, A. Galtarossa, L. Palmieri, M. Santagiustina
A machine learning technique was recently proposed to optimize the gain of a multi-pump single-mode Raman amplifier, using neural networks to approximate the function that maps a given gain profile to the corresponding set of pump powers and wavelengths by training them on synthetic datasets of Raman gains. This method was then extended to FMFs, showing good results in terms of gain flatness and mode-dependent gain, but limited to the C band only. In this paper, we show that the design choice of the dataset generation phase can impact the quality of the neural network predictions, and propose different techniques to improve their accuracy. We present improved results on both flat and tilted gain profiles on the entire C+L band using a few-mode fiber supporting the LP01 and LP11 mode groups and using 8 Raman pumps.
{"title":"C+L Band Gain Design in Few-mode Fibers Using Raman Amplification and Machine Learning","authors":"G. Marcon, A. Galtarossa, L. Palmieri, M. Santagiustina","doi":"10.1109/ICOP49690.2020.9300321","DOIUrl":"https://doi.org/10.1109/ICOP49690.2020.9300321","url":null,"abstract":"A machine learning technique was recently proposed to optimize the gain of a multi-pump single-mode Raman amplifier, using neural networks to approximate the function that maps a given gain profile to the corresponding set of pump powers and wavelengths by training them on synthetic datasets of Raman gains. This method was then extended to FMFs, showing good results in terms of gain flatness and mode-dependent gain, but limited to the C band only. In this paper, we show that the design choice of the dataset generation phase can impact the quality of the neural network predictions, and propose different techniques to improve their accuracy. We present improved results on both flat and tilted gain profiles on the entire C+L band using a few-mode fiber supporting the LP01 and LP11 mode groups and using 8 Raman pumps.","PeriodicalId":131383,"journal":{"name":"2020 Italian Conference on Optics and Photonics (ICOP)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117330336","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 : 2020-09-09DOI: 10.1109/ICOP49690.2020.9300336
M. R. Zefreh, F. Forghieri, S. Piciaccia, P. Poggiolini
The accuracy of both GN and Enhanced GN (EGN) models are investigated for a legacy dispersion-managed ultra-long-haul optical link by comparing its predictions with split-step simulations. The EGN model shows good accuracy in system performance prediction, when signal power depletion and ASE contribution to nonlinear interference (NLI) are considered.
{"title":"Nonlinearity Assessment in Long Haul Dispersion Managed Fiber Optic Links","authors":"M. R. Zefreh, F. Forghieri, S. Piciaccia, P. Poggiolini","doi":"10.1109/ICOP49690.2020.9300336","DOIUrl":"https://doi.org/10.1109/ICOP49690.2020.9300336","url":null,"abstract":"The accuracy of both GN and Enhanced GN (EGN) models are investigated for a legacy dispersion-managed ultra-long-haul optical link by comparing its predictions with split-step simulations. The EGN model shows good accuracy in system performance prediction, when signal power depletion and ASE contribution to nonlinear interference (NLI) are considered.","PeriodicalId":131383,"journal":{"name":"2020 Italian Conference on Optics and Photonics (ICOP)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126219155","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 : 2020-09-09DOI: 10.1109/ICOP49690.2020.9300342
J. Nanni, Lorenzo Baschieri, Andrea Giovannini, Enrico Lenzi, J. Laheurte, J. Polleux, G. Tartarini
Commercial couplers designed for 1550nm are conveniently adopted for realizing efficient Radio-over-Fiber links operating at 850nm on the standard G.652 single mode fiber. In particular, exploiting the mode filtering properties observed in these couplers when excited at 850nm, a multi-wavelength system over the standard G.652 fiber is obtained, opening the possibility to easily integrate in currently developed infrastructures such low cost systems operating in the first optical window.
{"title":"Efficient Solution to Bimodal Propagation Effects in Low-Cost 850nm Radio over G.652-Fibre Systems","authors":"J. Nanni, Lorenzo Baschieri, Andrea Giovannini, Enrico Lenzi, J. Laheurte, J. Polleux, G. Tartarini","doi":"10.1109/ICOP49690.2020.9300342","DOIUrl":"https://doi.org/10.1109/ICOP49690.2020.9300342","url":null,"abstract":"Commercial couplers designed for 1550nm are conveniently adopted for realizing efficient Radio-over-Fiber links operating at 850nm on the standard G.652 single mode fiber. In particular, exploiting the mode filtering properties observed in these couplers when excited at 850nm, a multi-wavelength system over the standard G.652 fiber is obtained, opening the possibility to easily integrate in currently developed infrastructures such low cost systems operating in the first optical window.","PeriodicalId":131383,"journal":{"name":"2020 Italian Conference on Optics and Photonics (ICOP)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121370054","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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