Dual-Comb Architecture for Fast Spectroscopic Measurements and Spectral Characterization

Martín-Mateos, Pedro; Ruiz-Llata, Marta; Posada-Román, Julio E.; Acedo, Pablo

doi:10.1109/lpt.2015.2421276

Cited by 59 publications

(28 citation statements)

References 18 publications

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“…This is possible because, through the DOFC approach, the optical frequencies of comb modes are downshifted to a lower frequency range, in the detection bandwidth of a photodetector; hence, the optical comb is mapped into the radio-frequency (RF) spectrum [12]. …”

Section: Dual-optical Frequency Comb-based Fbg Interrogation Systemmentioning

confidence: 99%

“…The incorporation of dual-optical frequency comb techniques would also allow for the detection of small changes in the spectrum of FBGs with a large dynamic range [11]. Electro-optic dual OFCs have been recently applied in spectroscopy to obtain more compact and portable systems for field applications [12], as they provide coherent broadband sources with higher power per line and independent control of line spacing and comb bandwidth. They offer flexible and optimized sources for the interrogation of other sensors, such as FBGs.…”

Section: Introductionmentioning

confidence: 99%

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Fast Interrogation of Fiber Bragg Gratings with Electro-Optical Dual Optical Frequency Combs

Posada-Román

García-Souto

Poiana

et al. 2016

Sensors

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Optical frequency combs (OFC) generated by electro-optic modulation of continuous-wave lasers provide broadband coherent sources with high power per line and independent control of line spacing and the number of lines. In addition to their application in spectroscopy, they offer flexible and optimized sources for the interrogation of other sensors based on wavelength change or wavelength filtering, such as fiber Bragg grating (FBG) sensors. In this paper, a dual-OFC FBG interrogation system based on a single laser and two optical-phase modulators is presented. This architecture allows for the configuration of multimode optical source parameters such as the number of modes and their position within the reflected spectrum of the FBG. A direct read-out is obtained by mapping the optical spectrum onto the radio-frequency spectrum output of the dual-comb. This interrogation scheme is proposed for measuring fast phenomena such as vibrations and ultrasounds. Results are presented for dual-comb operation under optimized control. The optical modes are mapped onto detectable tones that are multiples of 0.5 MHz around a center radiofrequency tone (40 MHz). Measurements of ultrasounds (40 kHz and 120 kHz) are demonstrated with this sensing system. Ultrasounds induce dynamic strain onto the fiber, which generates changes in the reflected Bragg wavelength and, hence, modulates the amplitude of the OFC modes within the reflected spectrum. The amplitude modulation of two counterphase tones is detected to obtain a differential measurement proportional to the ultrasound signal.

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Section: Dual-optical Frequency Comb-based Fbg Interrogation Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fast Interrogation of Fiber Bragg Gratings with Electro-Optical Dual Optical Frequency Combs

Posada-Román

García-Souto

Poiana

et al. 2016

Sensors

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“…Interrogation of the FBG sensor is implemented based on the principle of an Optical Frequency Comb (OFC) generation system [8], which is doubled to obtain a Dual-Comb [9]. The basic scheme of an OFC source is presented in Fig.…”

Section: Dual-optical Frequency Comb-based Fbg Measurement Systemmentioning

confidence: 99%

“…3). Both OFCs are modulated with different frequencies that when mixed, the frequency shift of the modes and an integer number of them are obtained, generating the equivalent frequency comb in the electrical domain [9]. However, the signals obtained are the result of average pulse upper and lower sidebands; for this reason an acousto-optical modulator (AOM) is included in the set-up which shifts the signal frequency characteristics guaranteeing spectral combs and improving the signal to noise ratio [10].…”

Section: Dual-optical Frequency Comb-based Fbg Measurement Systemmentioning

confidence: 99%

Fast interrogation of fiber Bragg grating sensors using electro-optic dual optical frequency combs

et al. 2015

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In this document, a FBG interrogation system based on a multimode optical source and a direct read-out is proposed for measuring fast phenomena such as vibrations and ultrasounds. The system is based on an electro-optic dual optical frequency-comb. This architecture allows the configuration of the multimode optical source parameters such as the number of modes that are within the reflected spectrum (FWHM) of the FBG. Results are presented for the dual-comb operating under optimized control when mapping these optical modes onto detectable tones of multiples of 100 kHz around a centre radiofrequency tone (40 MHz). Dynamic strain is induced onto the fiber through an actuator, which generates changes in the reflected wavelength of the FBG and in turn the modes within the reflected spectrum. The electrical signals are analyzed using fast Fourier transform algorithms allowing identification of the vibrations.

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“…widen even further the range of applications and would surely help to bring technologies such as THz generation, dual-comb spectroscopy [4] or optical processing [8] out of the laboratory. In this sense, the implementation of OFC in a single device using Mode-Locking Laser Diodes (MLLD) is one of the possibilities.…”

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confidence: 99%

Expansion of VCSEL-Based Optical Frequency Combs in the Sub-THz Span: Comparison of Non-Linear Techniques

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Dios

Criado³

et al. 2016

J. Lightwave Technol.

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Dual-Comb Architecture for Fast Spectroscopic Measurements and Spectral Characterization

Cited by 59 publications

References 18 publications

Fast Interrogation of Fiber Bragg Gratings with Electro-Optical Dual Optical Frequency Combs

Fast Interrogation of Fiber Bragg Gratings with Electro-Optical Dual Optical Frequency Combs

Fast interrogation of fiber Bragg grating sensors using electro-optic dual optical frequency combs

Expansion of VCSEL-Based Optical Frequency Combs in the Sub-THz Span: Comparison of Non-Linear Techniques

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