Patent
Fiber optic amplifier
Herbert J. Shaw,M.J.F. Digonnet +1 more
Reads0
Chats0
TLDR
In this paper, the authors used a multiplexing coupler to combine the signal to be amplified and illumination from a pumping illumination source onto a single optical fiber, where the pumping illumination inverts the neodymium ions within the ND:YAG crystal.Abstract:
An amplifier for use with fiber optic systems comprises a neodymium YAG crystal placed in series with a signal-carrying optical fiber. The ND:YAG crystal is supplied by the optical fiber with both the signal to be amplified, and pumping illumination. The pumping illumination is coupled onto the optical fiber by a multiplexing coupler which is used to combine the signal to be amplified and illumination from a pumping illumination source onto a single optical fiber. The pumping illumination inverts the neodymium ions within the ND:YAG crystal. The signal to be amplified propagates through this crystal to stimulate emission of coherent light from the neodymium ions, resulting in amplification of the signal. Because this arrangement permits the ND:YAG crystal to be end-pumped with pumping illumination, and because the length of the ND:YAG crystal may be substantially greater that the absorption length for the crystal at the wavelength of the pumping illumination, virtually all of the pumping illumination may be absorbed within the ND:YAG crystal and used for amplification of the signal carried by the optical fiber.read more
Citations
More filters
PatentDOI
Optical fiber lasers and amplifiers
TL;DR: In this paper, the authors present an approach for coupling radiation into a single-mode core of an optical fiber laser with a relatively large, multimode cladding at a location which is displaced from the center of the cross-section of the cladding.
Patent
A method and apparatus for amplifying an optical signal
TL;DR: In this paper, a method and apparatus for amplifying optical signal propagating in an optical waveguide using an active OO waveguide characterized by a longitudinally variable structure is presented.
Patent
Optical system with bright light output
TL;DR: In this paper, the input end of a fiberoptic waveguide is squashed into an elongated cross section so as to guide light emitted from a diode laser bar.
Patent
Laser diode pumped solid state laser
Thomas M. Baer,Mark S. Keirstead +1 more
TL;DR: In this paper, a matched high efficiency laser diode, including a diode array and a multi-spatial mode extended emitter diode was used to produce a compact, high efficiency and long lifetime laser assembly, which can be converted to the visible spectrum by an intra-cavity frequency doubler.
Patent
Laser diode/lens assembly
David F. Doggett,Bruce W. McCaul +1 more
TL;DR: In this article, a laser diode/lens assembly wherein a lens is immovably fixed to an outer surface of this window so that a central axis of a beam of laser radiation emerging from the lens has a desired spatial relationship with a reference surface of the housing is described.
References
More filters
Journal ArticleDOI
Single-mode fibre optic directional coupler
TL;DR: In this paper, a technique for the fabrication of singlemode fiber optic directional couplers is presented for the single-mode optical fiber optic (SOMO) directional coupler.
Journal ArticleDOI
Analysis of a tunable single mode optical fiber coupler
Michel J. F. Digonnet,H.J. Shaw +1 more
TL;DR: In this article, the authors report the operation and theoretical modeling of an efficient, tunable, and low-loss single-mode fiber coupler, which can be tuned to achieve up to 100 percent coupling ratio and 50 dB extinction ratio between coupled and direct branches.
Patent
Fiber optic directional coupler
TL;DR: In this paper, the coupler employs generally parallel, intersecting strands of fiber optic material having the cladding removed on one side thereof to within a few microns of the fiber cores in the region of intersection to permit light transfer between the strands.