Method and Apparatus for Side Pumping an Optical Fiber
Patent, Filed 7 Dec 95, patented 29 Dec 98
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
The invention pertains to a technique for the efficient coupling of pump light into a fiber by injecting the light through the side of a fiber leaving the fiber ends accessible to input and output coupling. This technique relies on the fabrication of a groove or a microprism into the side of the fiber. The groove shape is adapted effective to the variables of light wavelength, orientation of the source and variables relating to fiber construction so as to allow the efficient injection of pump light. Light emerging from a laser diode or other suitable means for launching light placed on the opposite side of the fiber, and in proximity to the fiber wall, propagates laterally through the fiber and impinges on the sides of the groove. The vertical rays impinging on the grove facets are specularly reflected and directed along the horizontal fiber axis of the outer core. By employing a reflective coating on the groove, the reflectivity of the groove facets approach 100 for a wide range of incidence angles. In this manner one can launch external optical signals into an optical fiber.
- Fiber Optics and Integrated Optics