Thanks to a double-frequency phase modulation scheme, we report a vector Brillouin optical time-domain analyzer (BOTDA). This BOTDA has a high immunity level to noise, and it features a phase spectrogram capability. It is well suited for complex situations involving several acoustic resonances, such as high-order longitudinal modes. It has notably been used to characterize a dispersion-shifted fiber, allowing us to report spectrograms with multiple acoustic resonances. A very high 57 dB dynamic range is also reported for 100-ns-long pulses simultaneously with a 16 cm numerical resolution.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OL.35.003850 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Optical excitation and detection of high-frequency Sezawa modes in Si/SiO system decorated with NiFe nanodot arrays.
Ultrasonics
November 2024
Department of Condensed Matter and Materials Physics, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 106, India. Electronic address:
Surface acoustic waves have emerged as one of the potential candidates for the development of next-generation wave-based information and computing technologies. For practical devices, it is essential to develop the excitation techniques for different types of surface acoustic waves, especially at higher microwave frequencies, and to tailor their frequency versus wave vector characteristics. We show that this can be done by using ultrashort laser pulses incident on the surface of a multilayer decorated with a periodic array of metallic nanodots.
View Article and Find Full Text PDFThis article presents a flexibly tunable microwave photonic filter (MPF) with a dual ultra-narrow passband based on a dual-wavelength and narrow linewidth Brillouin laser. The dual passband of the filter not only exhibits ultra-high frequency selectivity but also allows for flexible and simultaneous tuning of the center frequency and interval of the passbands. In the proposed scheme, the core optical processor of the MPF consists of a dual-ring Brillouin laser resonator, which is composed of a 100-meter main fiber ring cascaded with a 10-meter secondary fiber ring.
View Article and Find Full Text PDFComplex charge density waves in simple electronic systems of two-dimensional III-VI materials.
Nat Commun
November 2024
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, China.
Charge density wave (CDW) is the phenomenon of a material that undergoes a spontaneous lattice distortion and modulation of the electron density. Typically, the formation of CDW is attributed to Fermi surface nesting or electron-phonon coupling, where the CDW vector (Q) corresponds to localized extreme points of electronic susceptibility or imaginary phonon frequencies. Here, we propose a new family of multiple CDW orders, including chiral Star-of-David configuration in nine 2D III-VI van der Waals materials, backed by first-principles calculations.
View Article and Find Full Text PDFAn approach to suppressing Brillouin scattering-induced noise in long-haul high-power radio-over-fiber (RoF) links is proposed via non-uniformly distributed four-tone phase modulation. Four single-tone signals with uneven frequency intervals are utilized to phase modulate the optical signal before transmission. The power transferring from the optical carrier to the non-uniformly distributed modulation sidebands largely suppresses the Brillouin scattering-induced relative intensity noise (RIN).
View Article and Find Full Text PDFChiral Damping of Magnons.
Phys Rev Lett
October 2024
Department of Electrical and Computer Engineering, National University of Singapore, 117583, Singapore.
Chiral magnets have garnered significant interest due to the emergence of unique phenomena prohibited in inversion-symmetric magnets. While the equilibrium characteristics of chiral magnets have been extensively explored through the Dzyaloshinskii-Moriya interaction (DMI), nonequilibrium properties like magnetic damping have received comparatively less attention. We present the inaugural direct observation of chiral damping through Brillouin light scattering (BLS) spectroscopy.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!