We have developed a fiber-optic sensor which can determine both temperature and strain simultaneously from dual-wavelength cross-talk observations. The device consists of a pair of single-mode cores embedded in a common cladding and symmetrically positioned in the center of the fiber. When one core is illuminated with monochromatic light, complete energy exchange from one core to the other and back takes place in a beat length. A change in temperature or strain causes a change in the beat length and an expansion or contraction of the fiber; the net effect is a variation in the relative intensity of the cores at the end of the fiber.

© 1985 Optical Society of America

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