scholarly journals Annealing of linear birefringence in single-mode fiber coils: application to optical fiber current sensors

1991 ◽  
Vol 9 (8) ◽  
pp. 1031-1037 ◽  
Author(s):  
D. Tang ◽  
A.H. Rose ◽  
G.W. Day ◽  
S.M. Etzel
Keyword(s):  
Optical Fiber ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Linear Birefringence ◽  
Current Sensors

scholarly journals Microdrilled tapers to enhance optical fiber lasers for sensing

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
R. A. Perez-Herrera ◽  
M. Bravo ◽  
P. Roldan-Varona ◽  
D. Leandro ◽  
L. Rodriguez-Cobo ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Fiber Lasers ◽  
Signal To Noise Ratio ◽  
Power Level ◽  
Single Mode ◽  
Optical Signal ◽  
Single Mode Fiber ◽  
Output Power Level ◽  
Linear Cavity

AbstractIn this work, an experimental analysis of the performance of different types of quasi-randomly distributed reflectors inscribed into a single-mode fiber as a sensing mirror is presented. These artificially-controlled backscattering fiber reflectors are used in short linear cavity fiber lasers. In particular, laser emission and sensor application features are analyzed when employing optical tapered fibers, micro-drilled optical fibers and 50 μm-waist or 100 μm-waist micro-drilled tapered fibers (MDTF). Single-wavelength laser with an output power level of about 8.2 dBm and an optical signal-to-noise ratio of 45 dB were measured when employing a 50 μm-waist micro-drilled tapered optical fiber. The achieved temperature sensitivities were similar to those of FBGs; however, the strain sensitivity improved more than one order of magnitude in comparison with FBG sensors, attaining slope sensitivities as good as 18.1 pm/με when using a 50 μm-waist MDTF as distributed reflector.

Refractive index and temperature sensing characteristics of an optical fiber sensor based on a tapered single mode fiber/polarization maintaining fiber

2016 ◽  
Vol 14 (5) ◽  
pp. 050604-50608
Author(s):  
Zaihang Yang Zaihang Yang ◽  
Hao Sun Hao Sun ◽  
Tingting Gang Tingting Gang ◽  
Nan Liu Nan Liu ◽  
Jiacheng Li Jiacheng Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Temperature Sensing ◽  
Fiber Sensor ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Sensing Characteristics

scholarly journals Terahertz Generation in an Electrically Biased Optical Fiber: A Theoretical Investigation

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Montasir Qasymeh
Keyword(s):  
Optical Fiber ◽  
Wide Spectrum ◽  
Single Mode ◽  
Difference Frequency Generation ◽  
Phase Match ◽  
Single Mode Fiber ◽  
Nonlinear Susceptibility ◽  
Thz Radiation ◽  
Novel Approach ◽  
Proper Design

We propose and theoretically investigate a novel approach for generating terahertz (THz) radiation in a standard single-mode fiber. The optical fiber is mediated by an electrostatic field, which induces an effective second-order nonlinear susceptibility via the Kerr effect. The THz generation is based on difference frequency generation (DFG). A dispersive fiber Bragg grating (FBG) is utilized to phase match the two interacting optical carriers. A ring resonator is utilized to boost the optical intensities in the biased optical fiber. A mathematical model is developed which is supported by a numerical analysis and simulations. It is shown that a wide spectrum of a tunable THz radiation can be generated, providing a proper design of the FBG and the optical carriers.

Loosening Monitoring of Bolted Joints Using Optical Fiber Bending Sensor for Aircraft Lug Assembly

2012 ◽  
Vol 225 ◽  
pp. 540-545
Author(s):  
Hye Jin Shin ◽  
Jung Ryul Lee ◽  
Chan Yik Park
Keyword(s):  
Optical Fiber ◽  
Human Life ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Bolted Joints ◽  
Sensor Nodes ◽  
Optical Time Domain Reflectometer ◽  
Critical Defect ◽  
Optical Time ◽  
Bending Sensor

Bolted joints of aircraft lug assembly play an important role in connecting the wing and fuselage of an aircraft structure. Generally, the bolted joints get loosened because they are frequently exposed to the dynamic loads induced when an aircraft is in service. For this reason, it is important to monitor the condition of the bolted joints to avoid any critical defect that will lead to any risk in human life. However, it is difficult to conduct the bolted joints’ loosening inspection by an operator. In past few decades, optical fiber based sensor has been widely used due to its advancement over a conventional piezoelectric (PZT) sensor, especially due to its small size and light weight. With regard to this, a loosening monitoring of bolted joints using optical fiber bending sensor for aircraft lug assembly is proposed in this paper. The lug assembly specimen, which consists of a stainless steel lug, CFRP/Nomex honeycomb sandwich panel, carbon-steel bolt, nut and washer, and the monitoring system, which consists of a single mode fiber with ten optical fiber bending sensor nodes and an Optical Time-domain Reflectometer (OTDR) were used to determine the bolt loosening at every 1 degree interval.

scholarly journals THEORETICAL EVALUATION OF NONLINEAR EFFECTS ON OPTICAL WDM NETWORKS WITH VARIOUS FIBER TYPES

2010 ◽  
Vol 9 (2) ◽  
pp. 53-66 ◽  
Author(s):  
YASIN M. KARFAA ◽  
M. ISMAIL ◽  
F. M. ABBOU ◽  
A. S. SHAARI
Keyword(s):  
Optical Fiber ◽  
Stimulated Raman Scattering ◽  
Fiber Type ◽  
Nonlinear Effects ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Wdm Networks ◽  
Fiber Types ◽  
Theoretical Evaluation ◽  
Wdm Network

A theoretical study is carried out to evaluate the performance of an opticalwavelength division multiplexing (WDM) network transmission system in the presenceof crosstalk due to optical fiber nonlinearities. The most significant nonlinear effects inthe optical fiber which are Cross-Phase Modulation (XPM), Four-Wave Mixing (FWM),and Stimulated Raman Scattering (SRS) are investigated. Four types of optical fiber areincluded in the analysis; these are: single-mode fiber (SMF), dispersion compensationfiber (DCF), non-zero dispersion fiber (NZDF), and non-zero dispersion shifted fiber(NZDSF). The results represent the standard deviation of nonlinearity induced crosstalknoise power due to FWM and SRS, XPM power penalty for SMF, DCF, NZDF, andNZDSF types of fiber, besides the Bit Error Rate (BER) for the three nonlinear effectsusing standard fiber type (SMF). It is concluded that three significant fiber nonlinearitiesare making huge limitations against increasing the launched power which is desired,otherwise, lower values of launched power limit network expansion including length,distance, covered areas, and number of users accessing the WDM network, unlesssuitable precautions are taken to neutralize the nonlinear effects. Besides, various fibertypes are not behaving similarly towards network parameters.

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