Abstract
Abstract The longitudinal, flexural, and torsional modes of acoustical resonances are presented for a long and small thickness cylindrical fiber spool. The fiber spool is built using a monomode optical fiber tightly wound in a helix form around a cylindrical Styropor. The acoustical resonance values are obtained using a Mach Zehnder interferometer with the fiber spool in the long (2 km) arm and a small linewidth laser. To reduce spurious signals, the interferometer was placed inside a vacuum chamber. The measured and theoretical results reasonably agree up to the first fifteen resonant longitudinal modes and for the first five flexural and torsional resonant modes, with a span from 10 Hz up to 200 Hz.
Highlights
[4], integrated phase noise filters [18], or actively stabilized optical delay lines [19]. Those applications require the evaluation of the laser parameters such as Lorentzian linewidth [20]-[21], and several techniques have been developed for linewidth measurements [22], comprising: delayed selfheterodyne [23]-[24]; self-homodyne detection with short delay Mach-Zehnder interferometer (MZI)
The 75 Hz sound produces a vibration that is enough to provoke the appearance of resonance modes on the optical fiber spool (OFS), even inside a 1.2 Torr vacuum chamber air pressure, since the MZI is extremely sensitive to any external sound vibration
The MZI photoreceiver experimental signal using the Fast Fourier Transform (FFT) spectral analyzer from 1 Hz up to 200 Hz scan is shown in the power spectrum density (PSD) of Fig. 3
Summary
Laser noise reduction can be obtained using the filtering action of high-quality optical cavities [4], integrated phase noise filters [18], or actively stabilized optical delay lines [19]. Those applications require the evaluation of the laser parameters such as Lorentzian linewidth [20]-[21], and several techniques have been developed for linewidth measurements [22], comprising: delayed selfheterodyne [23]-[24]; self-homodyne detection with short delay Mach-Zehnder interferometer (MZI). The fiber provides immunity to electromagnetic interference, including 3D shaped
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