Stimulated Brillouin scattering in highly birefringent microstructure fiber: experimental analysis

Abstract

We report on an experimental analysis of stimulated Brillouin scattering (SBS) in a 20-m-long highly birefringent microstructure fiber for sensing applications. In particular, an experimental setup based on Brillouin optical frequency-domain analysis, operating at a wavelength of 1550 nm, has been employed in order to analyze the distribution of Brillouin frequency shift along the fiber, as well as to study the dependence of Brillouin frequency shift on optical polarization, temperature, and strain. Our results indicate that, for any fixed polarization, the fiber has a dual-peaked Brillouin spectrum. A study about the origin of these two peaks is presented.

Photonic crystal fiber mapping using Brillouin echoes distributed sensing

“…Due to their high nonlinear efficiency, PCFs have received particular attention for temperature and strain sensing. It has recently been reported that PCF with small core exhibit in most cases a multi-peak Brillouin spectrum due to the periodic air-hole microstructure [5][6][7]. This aspect could be advantageously used for simultaneous strain and temperature distributed measurements.…”

High resolution method for measuring Brillouin spectrum scattering in special optical fibers

“…The experimental measurements correspond to the x-polarization and shows two Brillouin peaks for this PCF separated ~100MHz. It has to be pointed out the good correlation between the numerical results 5 and the data obtained using the proposed technique. Besides, it is important to notice that in a previous paper only the first peak of the Brillouin spectrum is reported when the measurements were made with a similar fiber 5 .…”

“…It has to be pointed out the good correlation between the numerical results 5 and the data obtained using the proposed technique. Besides, it is important to notice that in a previous paper only the first peak of the Brillouin spectrum is reported when the measurements were made with a similar fiber 5 . Such kind of Brillouin spectra that present more than a peak is common in fibers with non conventional structures and relative small core.…”

Opto-acoustic coupling and Brillouin phenomena in microstructure optical fibers

“…Electrostriction-driven Brillouin phenomena, namely backward Stimulated Brillouin Scattering (SBS) and forward Guided Acoustic Wave Brillouin Scattering (GAWBS), constitute an important category of such optoacoustic coupling. The geometry of PCFs can dramatically modify the Brillouin spectrum, the gain and the stimulated Brillouin threshold, globally yielding much richer opto-acoustic dynamics and spectral features than in conventional fibers [2][3][4][5][6][7][8][9][10][11]. Specific transverse or longitudinal guided acoustics modes in the 100 MHz -10 GHz range can thus be selectively excited, resonantly enhanced and tightly confined within the microstructure, with an intimate dependence on its µm or sub-µm geometry.…”

“…Specific transverse or longitudinal guided acoustics modes in the 100 MHz -10 GHz range can thus be selectively excited, resonantly enhanced and tightly confined within the microstructure, with an intimate dependence on its µm or sub-µm geometry. All these specific features have great potential for developing novel PCF-based distributed Brillouin sensors [6,7,[12][13][14], for high-resolution longitudinal mapping of the intrinsic fluctuations of the fiber microstructure [15], and more generally for developing original tools of optical signal processing [1][2][3][4]9,16,17]. This talk will give a comprehensive overview of these original behaviors in a range of PCFs.…”