scholarly journals Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part II: Properties and Applications in Optical Communications and Sensing

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5914
Author(s):  
Gaspar Rego ◽  
Paulo Caldas ◽  
Oleg V. Ivanov
Keyword(s):  
Gamma Radiation ◽  
Optical Communications ◽  
Polarization Dependence ◽  
Fiber Gratings ◽  
Spectral Behavior ◽  
Long Period ◽  
Long Period Fiber Gratings ◽  
Fabrication Parameters

In this work, we review the most important achievements of INESC TEC related to the properties and applications of arc-induced long-period fiber gratings. The polarization dependence loss, the spectral behavior at temperatures ranging from cryogenic up to 1200 °C and under exposure to ultraviolet and gamma radiation is described. The dependence of gratings sensitivity on the fabrication parameters is discussed. Several applications in optical communications and sensing domains are referred.

scholarly journals Polarization dependence of asymmetric off-resonance long period fiber gratings

2016 ◽  
Vol 24 (26) ◽  
pp. 29843 ◽  
Author(s):  
Gilad Masri ◽  
Shir Shahal ◽  
Avi Klein ◽  
Hamootal Duadi ◽  
Moti Fridman
Keyword(s):  
Polarization Dependence ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings

scholarly journals Polarization dependence of asymmetric off-resonance long period fiber gratings: erratum

2017 ◽  
Vol 25 (5) ◽  
pp. 5787
Author(s):  
Gilad Masri ◽  
Shir Shahal ◽  
Avi Klein ◽  
Hamootal Duadi ◽  
Moti Fridman
Keyword(s):  
Polarization Dependence ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings

Mode field profile and polarization dependence of long period fiber gratings written by CO2 laser

2008 ◽  
Vol 281 (9) ◽  
pp. 2522-2525 ◽  
Author(s):  
Yiping Wang ◽  
D.N. Wang ◽  
Wei Jin ◽  
Hoi Lut Ho ◽  
Jian Ju
Keyword(s):  
Co2 Laser ◽  
Polarization Dependence ◽  
Field Profile ◽  
Fiber Gratings ◽  
Long Period ◽  
Mode Field ◽  
Long Period Fiber Gratings

scholarly journals Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part I: Fabrication, Characterization and Mechanisms of Formation

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4914
Author(s):  
Gaspar Rego ◽  
Paulo Caldas ◽  
Oleg V. Ivanov
Keyword(s):  
Arc Discharge ◽  
Electric Arc ◽  
Transmission Spectra ◽  
Fiber Gratings ◽  
Long Period ◽  
Electric Arc Discharge ◽  
Mechanisms Of Formation ◽  
Long Period Fiber Gratings ◽  
Fabrication Parameters

In this work, we reviewed the most important achievements of INESC TEC related to the fabrication of long-period fiber gratings using the electric arc technique. We focused on the fabrication setup, the type of fiber used, and the effect of the fabrication parameters on the gratings’ transmission spectra. The theory was presented, as well as a discussion on the mechanisms responsible for the formation of the gratings, supported by the measurement of the temperature reached by the fiber during an electric arc discharge.

scholarly journals Effect of Low-Doses of Gamma Radiation on Electric Arc-Induced Long Period Fiber Gratings

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2318
Author(s):  
Patricia Mesonero-Santos ◽  
Ana Fernández-Medina ◽  
Luis C. C. Coelho ◽  
Duarte Viveiros ◽  
Pedro A. Jorge ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Arc Discharge ◽  
Single Mode ◽  
Electric Arc ◽  
Good Choice ◽  
Wavelength Shift ◽  
Fiber Gratings ◽  
Space Applications ◽  
Long Period ◽  
Long Period Fiber Gratings

This work presents an experimental study on the effects of gamma radiation on Long Period Fiber Gratings (LPFGs) in a low-dose test campaign to evaluate their eventual degradation. The study was carried out with standard single-mode fibers where the grating was inscribed using the Electric-Arc Discharge (EAD) technique. Before the gamma campaign, a detailed optical characterization was performed with repeatability tests to verify the accuracy of the setup and the associated error sources. The gamma-induced changes up to a dose of 200 krad and the recovery after radiation were monitored with the Dip Wavelength Shift (DWS). The results show that the gamma sensitivity for a total dose of 200 krad is 11 pm/krad and a total DWS of 2.3 nm has been observed with no linear dependence. Post-radiation study shows that recovery from radiation-induced wavelength shift is nearly complete in about 4000 h. Experimental results show that the changes suffered under gamma irradiation of these LPFGs are temporary making them a good choice as sensors in space applications.

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