The present disclosure relates to accelerometers. Various embodiments of the teachings thereof may be used in a generator. For example, a fiber-optic accelerometer may include: an optical fiber having a free end which vibrates under the influence of acceleration; a light source emitting light into the optical fiber at an opposite end of the fiber; a mirror arranged to reflect a portion of the light back into the optical fiber; and a detection device receiving reflected light at the opposite end of the fiber. The optical fiber may comprise a double-cladding fiber including a core, an internal cladding, and an external cladding.
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