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We present the experimental demonstration of in-fiber acousto-optic coupling in a polyimide-coated optical fiber. Although the presence of the polyimide coating increases is significantly the attenuation of the acoustic wave, we show that acousto-optic interaction can still be produced with reasonable efficiency. The effect of the polyimide coating on the acousto-optic interaction process is analyzed...
In the last years, acousto-optic (AO) interaction has been proved to be a powerful and highly sensitive method for fine characterization of optical fibers. The key of the technique relies on the high sensitivity of the AO phase-matching condition with the structural and material properties of the fiber, enabling the detection of sub-nanometer fiber radius variations, or core refractive index variations...
When a photosensitive (PS) fiber is exposed to UV-irradiation, a permanent refractive index change is induced in the core. As a result, according to Kramers-Kronig relations, the absorption coefficient (α) is also increased. This increment of the absorption can lead to a significant heating of the fiber when it is illuminated by a moderate optical power. Thermal effects may produce spectral changes...
It is known that an acoustic/elastic wave propagating along an optical fiber has the capability to produce coupling between optical fiber modes. A variety of all-fiber, dynamic, and reconfigurable components based on this effect has been demonstrated over the last decades [1]. In the last years, acousto-optic (AO) interaction has been proved to be a powerful and highly sensitive method for the characterization...
An acoustic/elastic wave propagating along an optical fiber has the capability to produce coupling between optical fiber modes. A variety of all-fiber, dynamic, and reconfigurable components has been demonstrated over the last decades using either flexural· longitudinal· or torsional elastic modes [1· 2]. From the practical point of view, the main limitation of such devices arises from the huge elastic...
In-fiber acousto-optics enable accurate and broadband characterization of two mode optical fibers. Differential effective index, group index and dispersion are reported for two-mode optical fibers. Small phase differences between the quasi-degenerated vector modes comprising the LP11 mode are also measured. In addition, a fine analysis of fiber axial non-uniformities can be performed using a time-resolved...
Acousto-optic interaction in optical fibers is exploited for the accurate and broadband characterization of two-mode fibers. Differential modal index, group delay, and group-velocity dispersion is obtained. The technique is suitable for the characterization of few-mode fibers used in space-division multiplexing.
This study describes the optimized process for tapered fiber devices for an application in generating of super-continuum and a concrete example. These devices could prove very useful in bio-imaging applications. This process has been mentioned in many references, but without sufficient detail to allow other researchers can replicate in a simple and direct way. This article describes in detail the...
The resonance wavelength of whispering gallery modes (WGM) of an optical fiber shifts as a function of the fiber temperature. Monitoring the shift of a given WGM resonance at different positions of a fiber component gives direct information on the thermal effects produced in it. This information is particularly important in fiber power systems. Thermal effects in fiber Bragg gratings are investigated...
Cylindrical microcavities, as solid rods and microcapillaries, have several specific features compared to microspheres, microrings and microtoroids that make them particularly well suited for some applications. Making the optical resonances tunable is essential for many applications, and the cylindrical topology enables the implementation of several tuning techniques. In addition to thermal and strain...
The properties of whispering gallery modes (WGM) resonances of an optical fiber can be exploited in a number of different applications. Making these resonances tunable is essential for many applications. Using erbiumdoped fibers to prepare the microresonator (MR), WGM resonances can be tuned by pumping the MR with an auxiliary diode laser, enabling an all-optical fine tuning of the resonances. The...
For years, the in fibre acousto-optic interaction has been developed assuming harmonic excitation of a propagating acoustic mode-either the fundamental flexural, longitudinal or torsional mode-, and exploiting the dynamical properties of the interaction by controlling the amplitude and frequency of the RF voltage used for the generation of the acoustic wave. More recently, some works have investigated...
Optical microresonators (MR) exhibit a unique combination of high quality factor [1], small mode volume, and good mechanical stability that make these systems of interest for a number of photonics applications, such as narrowband lasers [2] and sensors. Silica microspheres, microdisks and toroids have been used for different applications. Recently, a series of studies using cylindrical MRs as microcylinders...
The interplay between chromatic dispersion and nonlinear effects is crucial for an efficient exploitation of non linear propagation in photonic crystal fibers (PCF). Once a PCF preform has been prepared, changing the parameters that control the fabrication process it is possible to adjust the dispersion properties of the fiber. In addition, it is particularly useful to develop postprocessing techniques...
Infiltration of materials into the air holes of the PCFs can potentially manipulate their optical properties creating a new category of fibers termed as hybrid PCFs [1] and many devices based on hybrid PCFs have been developed [2–5]. Recently, a hybrid PCF with poly-dimethylsiloxane (PDMS) elastomer inclusions has been demonstrated [6]. PDMS is widely used in the area of photonics and optofluidics...
Recent advances in the development of all-fibre amplitude modulators have led to the implementation of a series of different actively mode-locked fibre lasers [1–4]. In-fibre acousto-optic modulation based on intermodal coupling induced my a standing flexural acoustic wave permits the implementation of broad bandwidth (1.5 nm), high modulation depth (0.72), low-insertion-loss (0.75 dB) all-fibre amplitude...
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