Fiber- and integrated-optical microphones based on intensity modulation by beam deflection at a moving membrane

Nonlinear Distortion of the Fiber Optic Microphone

“…this allows the choice of a large number of knots to represent the fine details of the function f(x). By denoting the slope of each segment by a,, as shown in Figure 3, it is easy, following the procedure described in [7], to show, without performing any integration, that the coefficients Bk of the Fourier-series of (2) can be expressed by (3).…”

“…At present, there is a growing interest in designing fiber optic microphones using different principles [1][2][3][4][5][6]. The fiber optic microphone offers a simple and cheap solution for a digital telephone line based entirely on optical fiber support.…”

Fibre-optic microphone for optical communication systems

“…Ziming et al [5] have fabricated and tested a fibre optic microphone with a sufficient sensitivity in the frequency range from 300 to 3400 Hz. Several aproaches to realize a microphone are presented by Garthe [6,7]. He used two single mode fibres and a gradient index lens mounted in front of a reflecting membrane.…”

Harmonic and intermodulation performance of optical-fiber Mach–Zehnder microphone

“…At present there is a growing interest in designing fiber optic microphones using different principles [1][2][3][4][5][6][7][8][9][10]. This is attributed to their advantages over the conventional capacitive ones; for example their immunity to electromagnetic interference, lower sensitivity to vibrations, lighter weight and higher directionality [6].…”