Polarization properties of long-period gratings prepared by high-intensity femtosecond 352-nm pulses

Caucheteur, Christophe; Fotiadi, Andrei A.; Mégret, Patrice; Slattery, Stephen A.; Nikogosyan, David N.

doi:10.1109/lpt.2005.857576

Cited by 24 publications

(11 citation statements)

References 16 publications

(30 reference statements)

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“…Compact cost-effective laser sources with tunable coherency are of the great demand for a number of potential applications [1][2][3][4][5][6][7][8][9] . Among them are high-resolution spectroscopy, phase-coherent optical communications, microwave photonics, coherent optical spectrum analyze, and distributed fiber optics sensing [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] . Therefore, linewidth narrowing and stabilization of semiconductor laser light generation are of topical research interest.…”

Section: Introductionmentioning

confidence: 99%

Stabilizing DFB laser injection-locked to an external polarization maintaining optical fiber ring cavity

Panyaev

Itrin

Коробко

et al. 2023

Optical Sensors 2023

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We report on linewidth narrowing and stabilization of semiconductor DFB laser implemented through its self-injection locking to an external fiber ring cavity in conjunction with an active optoelectronic feedback circuit controlled by a simple low-cost USB-DAQ card. The system enables narrowing of the DFB laser linewidth below ~0.5 kHz and drastically reduced the laser phase noise. Specifically, the laser configuration is fully spliced from the polarization maintaining (PM) single-mode optical fiber that exhibits significantly improved stability against the environment noise. Drastic narrowing of the DFB laser linewidth down to ~310 Hz and a phase noise less than -100 dBc/Hz (>30 kHz) are achieved with the PM fiber ring cavity built from a single fiber coupler. The reported PM laser configuration is of great interest for many laser applications where a narrow sub-kHz linewidth, simple design and low cost are important.

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Section: Introductionmentioning

confidence: 99%

Stabilizing DFB laser injection-locked to an external polarization maintaining optical fiber ring cavity

Panyaev

Itrin

Коробко

et al. 2023

Optical Sensors 2023

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show abstract

“…With this device, broad-bandwidth ultrasound generation is achieved through the photoacoustic excitation of a special composite coating on the distal end of the multimode optical fiber by a pulsed laser 18 . Although most commercial sensing systems rely on measurements of the transmitted or reflected fundamental mode of single-mode optical fibers [19][20][21][22][23] , more recent developments have focused on multimodal architectures that considerably widen the sensing modalities, especially in the chemical and biological fields [24][25][26][27][28] . Mode-division multiplexing is mooted to address the possibility of multiparameter sensing with a single device, the reduction of cross-sensitivities, and the improved accuracy of a single measured parameter by combining the responses of many fiber modes to its evolution.…”

Section: Introductionmentioning

confidence: 99%

“…Stimulated Brillouin scattering (SBS) is able to assist all these new paradigms, enabling selective mode amplification, mode conversion and inter-mode signal processing to be implemented immediately inside the multimode optical fibers. Stimulated Brillouin scattering in multimode fibers has been previously studied in the context of the optical phase conjugation effect 2,3,23,24 , laser beam combining and cleanup 31 . In particular, the earliest experiments have demonstrated significant difference in the SBS gain factors measured with the optical modes of different orders excited in the same optical fiber sample 32 .…”

Section: Introductionmentioning

confidence: 99%

Brillouin interaction between single optical modes excited in multimode fibers

Fotiadi

Rafailov

Коробко

et al. 2023

Optical Sensors 2023

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A multimode optical fiber supports excitation and propagation of a pure single optical mode, i.e., the field pattern that satisfies the boundary conditions and does not change along the fiber. When two counterpropagating pure optical modes are excited, they could interact through the stimulated Brillouin scattering (SBS) process. Here, we present a simple theoretical formalism describing SBS interaction between two individual optical modes selectively excited in an acoustically isotropic multimode optical fiber. Employing a weakly guiding step-index fiber approach, we have built an analytical expression for the spatial distribution of the sound field amplitude in the fiber core and explored the features of SBS gain spectra, describing the interaction between modes of different orders. In this way, we give a clear insight into the sound propagation effects accompanying SBS in multimode optical fibers, and demonstrate their specific contributions to the SBS gain spectrum.

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“…technique, which is a non-photochemical process, LPG fabricated using the femtosecond laser has the similar modal birefringence in the fiber cladding as that of the cladding in CO2 fabricated LPG. Hence the LPG fabricated using femtosecond laser has higher PDL comparing to LPG fabricated using UV-laser [87].…”

Section: Femtosecond Laser Pulse Techniquementioning

confidence: 93%

Investigation of long-period gratings for sensor applications

Tan¹

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Long period fiber grating or LPG sensor has been gaining popularity due to its sensitivity to numerous perturbations such as temperature, strain and refractive index. The LPG has an advantage over other optical fiber sensors for refractive index sensing since the cladding region of the optical fiber, with LPG, is not required to be etched away in order to gain access to the evanescent field. Since the cladding modes propagates in the cladding within the LPG region of the optical fiber. The advantage is that the structural integrity of the optical fiber remains intact as compared to other optical fiber refractive index sensors with cladding etched away. Currently, a LPG sensor converts a measurand into wavelength. To interrogate the information would require expensive and complicated wavelength interrogation system. This will increase the overall system cost for industrial applications. In addition, other perturbations such as temperature and strain will affect the LPG wavelength, compromising the accuracy of the results. The aim of this research was the investigation of LPG for sensing applications such that the output from the LPG sensors is intensity-based instead of wavelength-based. Intensity-based LPG sensor requires its resonance dip or coupling strength to change with external perturbation of interest. Two intensity-based LPG sensors were developed and characterized. They were embedded LPG (ELPG) bending sensor and gelatin-coated LPG high relative humidity sensor. Embedding LPG in carbon-fiber composite material not only provides protection to the LPG, it was found experimentally that the ELPG responds to bending by changing its coupling strength with bending while its resonance wavelength remains unchanged. This was due to the matrix in the carbon-fiber composite which has a refractive index higher than that of the optical fiber cladding refractive index. That causes a change in the cladding mode viii

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Polarization properties of long-period gratings prepared by high-intensity femtosecond 352-nm pulses

Cited by 24 publications

References 16 publications

Stabilizing DFB laser injection-locked to an external polarization maintaining optical fiber ring cavity

Stabilizing DFB laser injection-locked to an external polarization maintaining optical fiber ring cavity

Brillouin interaction between single optical modes excited in multimode fibers

Investigation of long-period gratings for sensor applications

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