| 摘要 |
A continuously variable fiber-optic delay line is created from a deformable polymeric fiber in which lighter density elements, e.g. hydrogen, boron, carbon or oxygen, are diffused through the outer surface of the fiber. The diffusion of the lighter elements creates a non-light transmissive cladding that is of a refractive index that increases from the surface of the fiber towards its axis. The cladding longitudinally surrounds a light transmissive core and has a maximum refractive index that is less than any refractive index of the core. A single-mode, graded-index polymeric fiber is thereby created. By applying a reversible and controllable pressure to the exterior of the deformable fiber, the refractive index of the fiber can be changed accordingly. This change in refractive index permits one to continuously vary the time delay of a signal transmitted through a fixed length of the fiber.
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