Ultra-Long-Distance Fiber Bragg Grating Sensor System

Saitoh, T.; Nakamura, Kenichi; Takahashi, Yoshifumi; Iida, Hiroyuki; Iki, Yoshimitsu; Miyagi, Koichiro

doi:10.1109/lpt.2007.904918

Cited by 43 publications

(36 citation statements)

References 3 publications

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“…In addition to this, in [66], an approach using a tunable fiber ring laser with hybrid Raman-Erbium-doped fiber amplification was demonstrated, obtaining an optical SNR of 60 dB for 50 km. However, ultra-long distance FBG multiplexing systems have been demonstrated [67] without using optical amplification, obtaining acceptable signal to noise ratios (20 dB) after 120 km. Besides, a 200 km long fiber ring laser for multiplexing FBG arrays was recently developed [68] and it was also able to detect four multiplexed FBGs placed 250 km away, offering a signal to noise ratio of 6-8 dB [69].…”

Section: Multiwavelength Fiber Laser-based Multiplexing Systemsmentioning

confidence: 99%

Multi-Wavelength Fiber Lasers

Pérez-Herrera¹,

López-Amo²

2013

Current Developments in Optical Fiber Technology

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Section: Multiwavelength Fiber Laser-based Multiplexing Systemsmentioning

confidence: 99%

Multi-Wavelength Fiber Lasers

Pérez-Herrera¹,

López-Amo²

2013

Current Developments in Optical Fiber Technology

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“…The FBG interrogator has the specifications with the measurable wavelength range of 1520-1570 nm and with the wavelength reproducibility <0.001 nm in maximum, and the accuracy of 3σ = 0.001 nm (0.8 με in strain) is obtained when using an optical fiber with a length of 120 km in maximum. (10) The data acquisition system was established using the LabVIEW software. In the long-term monitoring here, the FBG interrogator was operated for 2 min once every hour.…”

Section: Target Bridge and Installed Fbg Monitoring Systemmentioning

confidence: 99%

Quality Evaluation of Fiber-Optic Strain Data Acquired in Long-Term Bridge Monitoring

2017

Sensors and Materials

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The qualities of fiber Bragg grating (FBG) strain data acquired in the long-term structural health monitoring of an existing concrete bridge were evaluated in this study. The possible sources of errors in the acquired data were first considered on the basis of the principle of the FBG sensor and the details of the installation of system components: FBGs, cables, epoxy, FBG interrogator, and data acquisition system. The data reliability was first evaluated by a defined measure: the availability ratio of FBG peak wavelengths throughout the period of 2012-2014. It was then said that the high reliabilities of the FBG interrogator and data acquisition system were ensured; however, reliability reduction was observed in some FBGs. The stability was also evaluated on the basis of the accuracy and sensitivity. A characteristic disturbance in the data accuracy, which is the standard deviation of the acquired FBG peak wavelength, was recognized only in specific FBGs. Moreover, the attachment condition issues in some FBGs were also recognized by sensitivity analyses. The results and considerations in this paper indicated the importance of those data quality analyses for the appropriate use of the long-term data in structural condition assessment throughout the life of existing civil infrastructures.

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“…Stable single longitudinal-mode (SLM) erbium-doped fiber lasers (EDFLs) have attracted great interest recently because they can be potentially applied in dense wavelength-division-multiplexed (DWDM) communications, fiber-sensing systems, high-resolution spectroscopy and 1 3 most of the interrogation techniques are based on a tunable laser sweep which may take several seconds [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the SLM behavior and remote sensing applications of a multi-wavelength fiber laser topology based on DWDMs

et al. 2015

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microwave photonics [1]. Several approaches have been employed to implement SLM operation in EDFLs, such as short linear cavity distributed Bragg reflector fiber lasers, fiber distributed feedback lasers, fiber ring lasers or Sagnac configurations [2,3] with different ring cavity topologies. However, the fiber ring laser unavoidably generates an enormous number of densely spaced longitudinal modes lying beneath the erbium gain profile due to the required intracavity optical components, connecting fibers, and a rather long cavity length. Thus, fiber ring lasers usually perform unstably with a larger linewidth due to the multimode oscillation, mode competition, and hopping. Several previous studies proposed by the authors [2,4] show that a single-mode operation of these laser systems in the C-band can be achieved when we emit simultaneously more than one wavelength using special ring cavity configurations.On the other hand, the utilization of CWDM techniques in sensors multiplexing enhances the power budged, and scalability of the network is possible in combination with DWDM techniques or ordinary couplers as stated in [5,6].Optical amplification techniques, and particularly, doped fiber amplifiers supposed a revolution for optical fiber systems [7]. Moreover, the use of Raman amplification also enabled the remote sensor operation, increasing the number of sensors per fiber on the network [7-9]. The optimum configuration of the amplifier employed in a sensor network strongly depends on the system topology, the number of sensors and the multiplexing technique [10].Investigation in remote sensing is under way with a few approaches of ultra-long-distance fiber Bragg gratings sensor systems using tunable filters or different interrogation techniques which reach as far as 250 km [11]. However, these systems have restrictive multiplexing capabilities (e.g., sensors can be located only at the end of the fiber) and do not allow a real-time monitoring. This is because Abstract In this work, two different multi-wavelength fiber ring laser configurations have been proposed and experimentally demonstrated. The aim of this paper is to show the versatility of the MUX/DMUX device for designing fiber lasers. That was carried out by enhancing the performance of two intrinsically different fiber lasers: an EDF in single longitudinal-mode (SLM) operation and an ultralong cavity multi-wavelength Raman laser for remote sensing applications. The main objective of the first experimental setup is to generate SLM emission lines with linewidths as narrow as possible. That was carried out by using the interaction between the reflected signals from the FBGs and the transmitted signal from the corresponding PS-FBG in each transmission band. The second topology consists of a multi-wavelength fiber laser for remote sensing applications by using Raman amplification where sensors located 100 km away from the receiver have been measured. As a remarkable improvement from other remote sensing systems, the sensors can be located at any place of the fi...

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Ultra-Long-Distance Fiber Bragg Grating Sensor System

Cited by 43 publications

References 3 publications

Multi-Wavelength Fiber Lasers

Multi-Wavelength Fiber Lasers

Quality Evaluation of Fiber-Optic Strain Data Acquired in Long-Term Bridge Monitoring

Experimental study of the SLM behavior and remote sensing applications of a multi-wavelength fiber laser topology based on DWDMs

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