Real-time fiber Bragg grating measurement system using temperature-controlled Fourier domain mode locking laser

Yamaguchi, Tatsuya; Shinoda, Yukitaka

doi:10.1117/1.oe.56.6.066112

Cited by 9 publications

(24 citation statements)

References 22 publications

(26 reference statements)

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“…The wavelength-sweep characteristics of the FDML laser were measured using an optical system with an optical tunable filter (FFM-C, Axsun Technologies) and a wavelength monitor (FB200, Ando) [19]. The wavelength monitor has a measurement range of 1527 to 1567 nm and a wavelength resolution of 1 pm.…”

Section: A Characteristics Of Fdml Lasermentioning

confidence: 99%

“…See http://www.ieee.org/publications_standards/publications/rights/index.html for more information. FDML laser [19], [20]. The FDML laser operates with a sweep frequency of 50.7 kHz, sweep band of ∼60 nm, and output power of ∼1.4 mW.…”

Section: Introductionmentioning

confidence: 99%

“…The optical system consists of an FDML laser, semiconductor optical amplifier (SOA1, SOA1013, Thorlabs), coupler (CP), circulators (CRs), FBG sensors installed in a multiplexed sensor path, and detectors (Ds). The FDML laser is constructed using a semiconductor optical amplifier (SOA2, SOA1117, Thorlabs), a fiber Fabry-Perot tunable filter (FFP-TF, Micron Optics), and a two-kilometer-long optical fiber [19]. Each component of the FDML laser is temperaturecontrolled, at a temperature of 25°C.…”

Section: Introductionmentioning

confidence: 99%

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Field-Programmable Gate Array-Based Multichannel Measurement System for Interrogating Fiber Bragg Grating Sensors

2019

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We develop a field-programmable gate array (FPGA)-based multichannel measurement system for sensing multiplexed fiber Bragg gratings (FBGs), using a high-speed wavelength-swept laser. The wavelength-swept laser, operated with Fourier-domain mode locking (FDML), exhibits a sweep frequency of 50.7 kHz and sweep band of ∼60 nm. A breakthrough in multichannel and real-time measurement is achieved by implementing an FPGA with unique parallel-processing circuits. This FPGA enables the implementation of a high-speed centroid-peakdetection circuit for FBG detection, which can be operated with a sampling frequency of 250 MHz. In multichannel measurement systems, the light propagating through each sensor path produces a delay, which reduces the measurement accuracy. This can be solved by implementing a delay-correction technique, which utilizes the time difference between two spectra obtained by a bidirectional scan of the FDML laser. The system is demonstrated to exhibit multichannel sensing and high measurement time resolution of 9.9 µs, without being affected by the delay.

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Section: A Characteristics Of Fdml Lasermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Field-Programmable Gate Array-Based Multichannel Measurement System for Interrogating Fiber Bragg Grating Sensors

2019

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“…The laser optical system consists of an FDML laser, an optical amplifier (OAMP), and a fiber optical switch (FSW). The FDML laser is a ring resonator type laser consisting of a semiconductor optical amplifier (SOA1117, Thorlabs), 4 kmlong optical fiber, and fiber Fabry-Perot tunable filter (FFP-TF, Micron) [30], [32]. The FFP-TF is driven by an oscillator (OSC, 33612A, Agilent) with a sinusoidal wave signal V C of a sweep frequency f m of 50.7 kHz.…”

Section: A Interrogation System With Automatic Recognition and Delay Correction Functions Of Fbgsmentioning

confidence: 99%

“…Our previous research proposed a method of correcting delay by using the bidirectional sweeping of the high-speed wavelengthswept laser. The developed systems were equipped with a field programmable gate array (FPGA) and performed real-time measurement without being affected by the delay [30]- [32].…”

Section: Introductionmentioning

confidence: 99%

Interrogation System With Automatic Recognition and Delay Correction Functions of Fiber Bragg Gratings by Pulse Modulation With Wavelength-Swept Laser

2019

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We propose an interrogation-system with automatic recognition and delay correction functions of fiber Bragg gratings (FBGs) by pulse modulation with a wavelength-swept laser. By pulse-modulating the light of a wavelength-swept laser, light with an arbitrary wavelength bandwidth can be extracted as the pulsed light. In the automatic recognition function of FBGs, the pulsed light is sequentially controlled to match the wavelength bandwidth of each FBG. This recognition method enables the selection and detection of a reflection signal from a single FBG. Therefore, reflection signals from multiple FBGs can be recognized individually. When multiple FBGs are installed at long distances, the reflection signal of each FBG is affected by the propagation time (delay). In the interrogation system with the wavelength-swept laser, the delay lowers the measurement accuracy. Therefore, a delay correction function using bidirectional sweeping of the wavelength-swept laser is used. The wavelength-swept laser using Fourier domain mode locking (FDML) is driven at a sweep frequency of 50.7 kHz with a sweep bandwidth of ∼60 nm. This study demonstrates that pulse-modulated FDML laser can automatically recognize reflection signals from multiple FBGs installed at arbitrary long distances. When the recognition process is complete, the interrogation system can perform real-time measurement with a time resolution of 9.9 µs, without being affected by delay that occurs when installing at a long distance.

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High-Speed Interrogation System for Fiber Bragg Gratings With Buffered Fourier Domain Mode-Locked Laser

2021

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We develop a high-speed interrogation system with a wavelength-swept laser for sensing multiplexed fiber Bragg gratings (FBGs). High-speed and multipoint sensing is achieved by means of a buffered Fourier domain mode-locked (FDML) laser, a recently proposed high-speed wavelength-swept laser. This laser increases the measurement rate several times by tailoring the laser output with a buffer stage. The developed buffered FDML laser successfully achieves a measurement rate of 202.8 kHz using a general FDML laser driven at a sweep rate of 50.7 kHz. In order to detect reflection signals of FBGs at the high measurement rate, the measurement system introduces digital signal processing using a field programmable gate array (FPGA). However, FBG measurements with wavelength-swept lasers are affected by the propagation time (delay) in the optical fiber connecting from the laser to the FBG sensor, which reduces measurement accuracy. To overcome this limitation, the developed system uses a delay correction method with bidirectional sweep of the buffered FDML laser. The interrogation system with the buffered FDML laser achieves a time resolution of 4.9 µs without being affected by the delay.

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Real-time fiber Bragg grating measurement system using temperature-controlled Fourier domain mode locking laser

Cited by 9 publications

References 22 publications

Field-Programmable Gate Array-Based Multichannel Measurement System for Interrogating Fiber Bragg Grating Sensors

Field-Programmable Gate Array-Based Multichannel Measurement System for Interrogating Fiber Bragg Grating Sensors

Interrogation System With Automatic Recognition and Delay Correction Functions of Fiber Bragg Gratings by Pulse Modulation With Wavelength-Swept Laser

High-Speed Interrogation System for Fiber Bragg Gratings With Buffered Fourier Domain Mode-Locked Laser

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