James H Fisher

Title: Innovations of James H Fisher

Introduction

James H Fisher is a notable inventor based in Batavia, IL (US). He has made significant contributions to the field of optical technology, holding a total of 2 patents. His work focuses on enhancing the efficiency and performance of optical systems.

Latest Patents

Fisher's latest patents include a micro-optic coupler incorporating a tapered fiber. This invention describes systems and methods for constructing micro-optical couplers that utilize optical tapers to reshape multimode optical inputs. By incorporating tapers, the spatial properties of multimode inputs can be adjusted to match the output fiber's spatial properties, even in systems limited to unity-magnification imaging optics. In an exemplary embodiment, a larger-core multimode fiber and a smaller-core double-clad fiber are glued into a glass capillary, with the multimode fiber tapering to a smaller diameter inside the capillary. Polishing the capillary to expose the taper results in a multimode core smaller than the double-clad core. Imaging with unity magnification through GRIN lenses and a dichroic reflector efficiently transfers the multimode input to the double-clad fiber, achieving greater efficiency than with an untapered fiber. The dichroic reflector is also transparent to a second single-mode signal input, which is collimated by a second GRIN lens and coupled through the reflector to the core of the double-clad fiber. An isolator may be included in the signal beam path, and the double-clad fiber can be replaced by a double-clad gain fiber.

Another significant patent by Fisher is a noise reduction technique for cladding pumped optical amplifiers. This invention outlines systems and methods for suppressing cladding modes at the signal wavelength in an optical fiber system utilizing an optical amplifier without affecting the pump wavelength. By removing the outer cladding of the gain fiber, a short section of single-mode fiber is created that does not guide higher-order modes, thereby attenuating them and eliminating unwanted noise. In this embodiment, modes are filtered at the end of the gain section of the optical fiber before splicing to an input fiber. Hydro florate etching can be used to remove the outer cladding, allowing the resulting fiber to maintain fundamental mode propagation without mode mixing, thus eliminating noise.

Career Highlights

James H Fisher is currently employed at Scientific-Atlanta, Inc. His work at this