Frequency fiber-optical sensor system with wavelength division multiplexing

2009 ◽  
Author(s):  
Alexandre V. Poliakov
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Sensor ◽  
Sensor System ◽  
Wavelength Division ◽  
Fiber Optical Sensor ◽  
Fiber Optical

Designing a photonic crystal fiber for an ultra-broadband parametric amplification in telecommunication region

2016 ◽  
Vol 25 (02) ◽  
pp. 1650023 ◽  
Author(s):  
Hassan Pakarzadeh ◽  
Mostafa Taghizadeh ◽  
Mohsen Hatami
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Wavelength Division Multiplexing ◽  
Wavelength Division ◽  
Crystal Fiber ◽  
Dispersion Wavelength ◽  
Zero Dispersion Wavelength ◽  
Highly Nonlinear ◽  
Fiber Optical ◽  
Fiber Optical Parametric Amplifier

A photonic crystal fiber (PCF) with a zero-dispersion wavelength (ZDW) in the telecommunication region is designed and an ultra-broadband fiber optical parametric amplifier (FOPA) based on such PCF is simulated. Results show that the PCF-based FOPA exhibits much higher gain with a very broad bandwidth (covering O- to U-band) in comparison with the highly nonlinear fiber (HNLF)-based FOPA. Also, the required fiber length and the input pump power are reduced for the PCF-based FOPA. The obtained results show the great potential of the PCF-based OPA for the telecommunication applications, e.g. amplification of wavelength-division multiplexing (WDM) signals.

scholarly journals Intensity and Wavelength Division Multiplexing FBG Sensor System Using a Raman Amplifier and Extreme Learning Machine

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Yibeltal Chanie Manie ◽  
Run-Kai Shiu ◽  
Peng-Chun Peng ◽  
Bao-Yi Guo ◽  
Mekuanint Agegnehu Bitew ◽  
...  
Keyword(s):  
Extreme Learning Machine ◽  
Wavelength Division Multiplexing ◽  
Sensor System ◽  
Bragg Wavelength ◽  
Wavelength Division ◽  
Raman Amplifier ◽  
Fbg Sensor ◽  
Transmission Distance ◽  
Fbg Sensors ◽  
Learning Machine

A fiber Bragg grating (FBG) sensor is a favorable sensor in measuring strain, pressure, vibration, and temperature in different applications, such as in smart structures, wind turbines, aerospace, industry, military, medical centers, and civil engineering. FBG sensors have the following advantages: immune to electromagnetic interference, light weight, small size, flexible, stretchable, highly accurate, longer stability, and capable in measuring ultra-high-speed events. In this paper, we propose and demonstrate an intensity and wavelength division multiplexing (IWDM) FBG sensor system using a Raman amplifier and extreme learning machine (ELM). We use an IWDM technique to increase the number of FBG sensors. As the number of FBG sensors increases and the spectra of two or more FBGs are overlapped, a conventional peak detection (CPD) method is unappropriate to detect the central Bragg wavelength of each FBG sensor. To solve this problem, we use ELM techniques. An ELM is used to accurately detect the central Bragg wavelength of each FBG sensor even when the spectra of FBGs are partially or fully overlapped. Moreover, a Raman amplifier is added to a fiber span to generate a gain medium within the transmission fiber, which amplifies the signal and compensates for the signal losses. The transmission distance and the sensing signal quality increase when the Raman pump power increases. The experimental results revealed that a Raman amplifier compensates for the signal losses and provides a stable sensing output even beyond a 45 km transmission distance. We achieve a remote sensing of strain measurement using a 45 km single-mode fiber (SMF). Furthermore, the well-trained ELM wavelength detection methods accurately detect the central Bragg wavelengths of FBG sensors when the two FBG spectra are fully overlapped.

scholarly journals A Research on Low Modulus Distributed Fiber Optical Sensor for Pavement Material Strain Monitoring

Sensors ◽  
2017 ◽  
Vol 17 (10) ◽  
pp. 2386 ◽  
Author(s):  
Lingjian Meng ◽  
Linbing Wang ◽  
Yue Hou ◽  
Guannan Yan
Keyword(s):  
Optical Sensor ◽  
Fiber Optical Sensor ◽  
Strain Monitoring ◽  
Fiber Optical ◽  
Low Modulus ◽  
Pavement Material

Application of multimode fiber optical sensor in optical tomography technology

2005 ◽  
Vol 43 (10) ◽  
pp. 1159-1166
Author(s):  
Shi Zhiwei ◽  
Zhou Huan ◽  
Li Yang ◽  
Zeng Yanhua
Keyword(s):  
Optical Sensor ◽  
Optical Tomography ◽  
Multimode Fiber ◽  
Fiber Optical Sensor ◽  
Fiber Optical
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