Recirculating fiber-optic notch filter employing fiber gratings

1999 ◽  
Vol 11 (7) ◽  
pp. 836-838 ◽  
Author(s):  
W. Zhang ◽  
J.A.R. Williams ◽  
I. Bennion
Keyword(s):  
Fiber Optic ◽  
Notch Filter ◽  
Fiber Gratings

Rugged Fiber-Optic Raman Probe for Process Monitoring Applications

2001 ◽  
Vol 55 (10) ◽  
pp. 1337-1340 ◽  
Author(s):  
Pentti Niemelä ◽  
Janne Suhonen
Keyword(s):  
Fiber Optic ◽  
Signal To Noise Ratio ◽  
Notch Filter ◽  
Laser Line ◽  
Fiber Optic Probe ◽  
Monitoring Applications ◽  
Optic Probe ◽  
Holographic Notch Filter ◽  
Filter Thickness ◽  
Raman Probe

We report on the development of a simple, rugged fiber-optic probe for process Raman measurements, in which laser line rejection is based on an absorptive longpass filter made from a direct bandgap CdTe semiconductor. The probe can be used with a fixed wavelength laser at 830 nm, and Raman spectra can be recorded down to 200 cm−1 from the laser line. The filter thickness can be adjusted for final turning of the filter edge, as the edge slope is almost independent of thickness in the range 0.1 to 1 mm. Other properties of the probe, such as its signal-to-noise ratio and signal-to-background ratio, are shown to compare well with those of a state-of-the-art probe based on holographic notch filter techniques.

Sensitivity-variable fiber optic pressure sensors using microbend fiber gratings

2009 ◽  
Vol 282 (23) ◽  
pp. 4532-4536 ◽  
Author(s):  
Hajime Sakata ◽  
Tetsuya Iwazaki
Keyword(s):  
Fiber Optic ◽  
Pressure Sensors ◽  
Fiber Gratings

scholarly journals MATHEMATICAL JUSTIFICATION OF FIBER SENSORS BASED ON FIBER BRAGG GRATINGS

2021 ◽  
Vol 117 (2) ◽  
pp. 129-135
Author(s):  
Waldemar Wójcik
Keyword(s):  
Monitoring System ◽  
Transfer Matrix ◽  
Transfer Matrix Method ◽  
Matrix Method ◽  
Fiber Optic ◽  
Spectral Characteristics ◽  
Fiber Optic Sensors ◽  
Fiber Gratings ◽  
Fiber Sensors ◽  
Bragg Fiber

Nowadays, the most promising approach is the use of fiber-optic sensors as a key element of the monitoring system. Fiber-optic sensors (FOS) have a number of advantages, the most important of which include immunity to electromagnetic interference, low weight and the possibility of their inclusion in the measured structure. The use of such sensors in the monitoring system will make it possible to simplify the measurement and obtain reliable data, as well as to obtain all new possibilities for measuring various quantities simultaneously.The most perspective are the sensors based on the Bragg fiber gratings. Bragg fiber gratings have several advantages, for instance, they allow creating the distributed measuring massifs, which contain several sensors. As well, they are insensitive to the optic power source vibrations. Variety of using the fiber sensors based on the Bragg fiber gratings has led to producing the Bragg fiber gratings with different spectral characteristics.The article herein considers the issues of the Bragg fiber gratings mathematical modeling using the transfer matrix method. Transfer matrix method allows defining the optical components spectral characteristics based on the bound modes theory and description of electromagnetic wave, passing through an optic fiber. In the article there have been analyzed the Bragg fiber gratings in compliance with spectral features, such as transmission and reflectance spectra.

Tuning of the Free Spectral Range of a Fiber Optic Notch Filter Using a Dispersive Link

2018 ◽  
Author(s):  
L. A. González-Mondragón ◽  
L. J. Quintero-Rodríguez ◽  
A. G. Correa-Mena ◽  
J. Rodríguez-Asomoza ◽  
A. García Juárez ◽  
...  
Keyword(s):  
Spectral Range ◽  
Fiber Optic ◽  
Free Spectral Range ◽  
Notch Filter

scholarly journals RESEARCH OF PARAMETERS OF FIBER-OPTICAL MEASURING SYSTEMS

2019 ◽  
Vol 9 (2) ◽  
pp. 28-31
Author(s):  
Waldemar Wójcik ◽  
Aliya Kalizhanova ◽  
Gulzhan Kashaganova ◽  
Ainur Kozbakova ◽  
Zhalau Aitkulov ◽  
...  
Keyword(s):  
Transfer Matrix ◽  
Transfer Matrix Method ◽  
Matrix Method ◽  
Fiber Optic ◽  
Spectral Characteristics ◽  
Fiber Optic Sensors ◽  
Spectral Features ◽  
Fiber Gratings ◽  
Bragg Fiber ◽  
Electromagnetic Disturbances

At present there exist a lot of technical devices, the failure of which can be connected not only with huge financial losses, but with the treat to the environment as well. Therefore, an important problem is the effective devices conditions diagnostics, including electronic components and check of their operation. Timely faults detecting allows introducing the prevention measures and avoiding serious consequences. Fiber-optic sensors have several advantages, more important of which include the immunity to electromagnetic disturbances, little weight and possibility to be included into the structure being measured. The most perspective are the sensors based on the Bragg fiber gratings. Bragg fiber gratings have several advantages, for instance, they allow creating the distributed measuring massifs, which contain several sensors. As well, they are insensitive to the optic power source vibrations. Variety of using the fiber sensors based on the Bragg fiber gratings has led to producing the Bragg fiber gratings with different spectral characteristics. Homogeneous Bragg fiber gratings have the spectra with solid side lobes, which can influence at the temperature sensor processing characteristics. To level the side lobes there is applied the apodization method, which is one of the means to affect the spectral form. The article herein considers the issues of the Bragg fiber gratings mathematical and computer modeling using the transfer matrix method. Transfer matrix method allows defining the optical components spectral characteristics based on the bound modes theory and description of electromagnetic wave, passing through an optic fiber. In the article there have been analyzed the Bragg fiber gratings in compliance with spectral features, such as transmission and reflectance spectra. As well, there has been carried out the experiment with influence of various parameters at the Bragg fiber gratings spectral characteristics. There have been studied the Bragg fiber gratings spectral features and selected the grating optimal parameters for designing the fiber-optic sensors based on the Bragg fiber gratings.

Fiber optic transversal filter design based on spectral tapping of broadband light using fiber gratings

2001 ◽  
Author(s):  
Xiaoke Yi ◽  
Wei Fang ◽  
Ng J. Hong ◽  
Lu Chao ◽  
Wende Zhong
Keyword(s):  
Fiber Optic ◽  
Filter Design ◽  
Fiber Gratings ◽  
Transversal Filter
Sign in / Sign up

Export Citation Format

Share Document