Numerical and experimental analysis of the modulation of fiber Bragg gratings by low-frequency complex acoustic waves

Silva, Ricardo E.; Franco, Marcos A. R.; Neves, Pedro Manuel Oliveira Janeiro; Bartelt, Hartmut; Pohl, Alexandre de Almeida Prado

doi:10.1016/j.yofte.2016.01.011

Cited by 7 publications

(5 citation statements)

References 24 publications

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“…Acoustic frequencies in general lower than 600 kHz induce a small separation Δλ between the lobes, overlapping as the modulated envelope illustrated in Fig. 1(c) 16 .…”

Section: Introductionmentioning

confidence: 76%

Ultra-compact acousto-optic modulator of a fibre Bragg grating in a highly birefringent suspended core fibre

Silva

Manuylovich

Sahoo

et al. 2021

Micro-Structured and Specialty Optical Fibres VII

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Highly efficient and compact acousto-optic modulator of a fibre Bragg grating is reported for the first time. The device is composed of millimetre scaled components and a 1 cm grating inscribed in a four air holes birefringent suspended core fibre. The reflection of the orthogonal polarization modes is tuned by a sinusoidal electrical signal at the resonance frequency of 469 kHz. A significant modulation depth of 45% is achieved at a maximum drive voltage of 10 V. The demonstrated 4 cm long all-fibre modulator is 60% shorter compared to previous similar setups, indicating new possibilities for stable and fast switching of fibre-integrated photonic devices.

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“…Acoustic frequencies in general lower than 600 kHz induce a small separation Δλ between the lobes, overlapping as the modulated envelope illustrated in Fig. 1(c) 16 .…”

Section: Introductionmentioning

confidence: 76%

Ultra-compact acousto-optic modulator of a fibre Bragg grating in a highly birefringent suspended core fibre

Silva

Manuylovich

Sahoo

et al. 2021

Micro-Structured and Specialty Optical Fibres VII

Self Cite

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“…16 As a result additional reflections are produced in the modulated spectrum while comparing to the single reflected peak spectrum of unmodulated UFBG. 17 This is shown in Figure 2.…”

Section: Ufbg Based Aotfmentioning

confidence: 90%

“…These give rise to a longitudinal vibration to be produced across fiber axis which in turn causes the UFBG to have regions of periodic expansion and compression with commensurable differences in refractive index . As a result additional reflections are produced in the modulated spectrum while comparing to the single reflected peak spectrum of unmodulated UFBG . This is shown in Figure .…”

Section: Principle and Concept Of The Proposed Schemementioning

confidence: 99%

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Performance improved tunable millimeter‐wave signal generation employing UFBG based AOTF with bit walk‐off effect compensation

Arya

Zacharias

2019

Micro & Optical Tech Letters

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A scheme for the generation of mm‐wave signals at different frequencies with improved performance is proposed and demonstrated by employing a uniform fiber Bragg grating based acousto‐optic tunable filter (UFBG‐AOTF). The different frequencies carry different information at a required data rate according to their application. This method reduces the complexity of the system by alleviating the cascaded Mach‐Zehnder modulators (MZM) and a good transmission performance can be achieved by the FBG. In the previous system, the distance of transmission is reduced to 15 km due to bit walk‐off effect and it also reduces the BER values at larger distances. In the proposed system, the bit walk‐off effect is discussed and compensated to increase the transmission distance up to 60 km. The simulation results along with clear eye‐diagrams show that the BER values are improved at larger distances than the previous system which proves the performance improvement of the proposed system.

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“…In the past two to three decades, fiber gratings have been intensively studied for applications in optical communications and sensing [1][2][3]. In the later domain, fiber Bragg gratings have also been used for detection of acoustic and ultrasound waves [4][5][6]. More recently, the scientific community focused their attention on the development of sensors able to detect deformations caused by shock waves working at frequencies from hundred kHz up to several GHz; examples of such acoustic shock waves are explosive detonation waves.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front

Иванов

Caldas

Rego

2021

Sensors

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In this paper, we investigate modification of transmission spectra of long-period fiber grating structures with an acoustic shock front propagating along the fiber. We simulate transmission through inhomogeneous long-period fiber gratings, π-shift and reflective π-shift gratings deformed by an acoustic shock front. Coupled mode equations describing interaction of co-propagating modes in a long-period fiber grating structures with inhomogeneous deformation are used for the simulation. Two types of apodization are considered for the grating modulation amplitude, such as uniform and raised-cosine. We demonstrate how the transmission spectrum is produced by interference between the core and cladding modes coupled at several parts of the gratings having different periods. For the π-shift long-period fiber grating having split spectral notch, the gap between the two dips becomes several times wider in the grating with the acoustic wave front than the gap in the unstrained grating. The behavior of reflective long-period fiber gratings depends on the magnitude of the phase shift near the reflective surface: an additional dip is formed in the 0-shift grating and the short-wavelength dip disappears in the π-shift grating.

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Numerical and experimental analysis of the modulation of fiber Bragg gratings by low-frequency complex acoustic waves

Cited by 7 publications

References 24 publications

Ultra-compact acousto-optic modulator of a fibre Bragg grating in a highly birefringent suspended core fibre

Ultra-compact acousto-optic modulator of a fibre Bragg grating in a highly birefringent suspended core fibre

Performance improved tunable millimeter‐wave signal generation employing UFBG based AOTF with bit walk‐off effect compensation

Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front

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