Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 5331449 | Optical fiber tree and branch network for AM signal distribution The use of a doped optical fiber amplifier enables the transmission of multi-channel AM-VSB television signals. An Erbium doped fiber amplifier is disclosed. The amplifier is also useful for reducing second order distortion products produced in an amplitu... | 07/19/1994 |
| 5323260 | Method and system for compressing and amplifying ultrashort laser pulses A method and system for compressing and amplifying light pulses using degenerate cross-phase modulation and degenerate four-wave mixing. A probe pulse and a pair of pump pulses are arranged so as to copropogate in condensed matter with the pump pulses hav... | 06/21/1994 |
| 5303314 | Method and apparatus for polarization-maintaining fiber optical amplification with orthogonal polarization output A single-polarization fiber optical amplifier and corresponding method is provided capable of amplifying an optical input signal by a fiber optic amplifier constructed of fiber which may be non-polarization-maintaining. The single-polarization fiber optic... | 04/12/1994 |
| 5301054 | Transmission of AM-VSB video signals over an optical fiber The use of a doped optical fiber amplifier enables the transmission of multi-channel AM-VSB television signals. An Erbium doped fiber amplifier is disclosed. The amplifier is also useful for reducing second order distortion products produced in an amplitu... | 04/05/1994 |
| 5299056 | Optical passive component assembly An optical fiber amplifier suited for use in optical fiber transmission systems includes a plurality of optical passive components. The optical passive components are integrated into an assembly including a birefringent crystal, a first lens, a magneto-op... | 03/29/1994 |
| 5291326 | Optical signal transmission system, particularly optical cable television system, with monitoring and service-channel facilities A system for optically transmitting a useful signal (S1) from a transmitter (1) over a transmission link which includes either an optical waveguide (3) or a fiber-optic network coupled to a receiver (2). The transmitter (1) transmits the useful... | 03/01/1994 |
| 5280383 | Dual-stage low power optical amplifier A two-stage optical fiber amplifier requiring substantially reduced power comprises a pre-amplifier first-stage operating in the linear region within the small signal limits, and a post-amplifier second-stage operating in a saturated regime providing sign... | 01/18/1994 |
| 5274495 | Optical amplifier An optical amplifier is disclosed which, in an optical amplifier adapted such that signal light and pump light are propagated through an optical waveguide structure (2, 2') therein made of an optically nonlinear material to thereby achieve optical paramet... | 12/28/1993 |
| 5260816 | Optical amplifier with erbium-doped fiber The optical amplification gain of an optical amplifier consisting of an optical amplifier unit and a single-mode erbium-doped fiber can be optimized when the length of the fiber L in meters and the optical absorption in dB/meter of the fiber per unit leng... | 11/09/1993 |
| 5251062 | Tellurite glass and fiber amplifier A tellurite glass particularly usable for an amplifier or oscillator utilizing an optical fiber or other guided wave structure. In approximate terms, the glass contain between 58 and 84 molar % of TeO2, up to 24 molar % Na2 O, and be... | 10/05/1993 |
| 5245467 | Amplifier with a samarium-erbium doped active fiber An optical fiber and an optical amplifier, in particular for optical fiber telecommunication lines operating with a transmission signal in a predetermined wavelength range. The amplifier comprises laser emitting active optical fiber doped with erbium and ... | 09/14/1993 |
| 5200964 | Broad linewidth lasers for optical fiber communication systems Non-linear effects in an optical fiber used for communicating AM signals at high power levels are reduced by increasing the linewidth of the pump laser output signal. The linewidth can be increased by optically broadening the laser output signal by drivin... | 04/06/1993 |
| 5155779 | Optical circulating shift register An all-optical circulating shift register encodes a received optical clock signal with a value derived from an encoded optical signal received at a control port thereof. A data input to the shift register is used to modify an encoded optical signal. The r... | 10/13/1992 |
| 5128801 | Integrated optical signal amplifier An optical signal amplifier with a waveguide path integrated into a glass body that is doped with optically active material. The signal to be amplified is transmitted through the waveguide and the pump power is coupled into the waveguide at one end. The w... | 07/07/1992 |
| 5119229 | Amplifier for optical fiber telecommunication lines and optical fiber telecommunication lines incorporating said amplifier An optical amplifier (3) in accordance with the invention consists of the assembly of a length of active-core optical fiber (8), single-mode to both pumping and signal optical radiations, and a dichroic coupler (6) which includes two optical fiber lengths... | 06/02/1992 |
| 5076658 | Non-linear optical polymeric fiber waveguides An optical waveguide is comprised of an optical fiber having a core and a cladding wherein the core comprises an organic polymer media exhibiting non-linear optical response over a predetermined optically transmissive region, the polymer having a predeter... | 12/31/1991 |
| 5074633 | Optical communication system comprising a fiber amplifier Disclosed is an optical communication system comprising at least two optical fibers of dissimilar core sizes, joined by a fusion splice. In one embodiment, the larger-core fiber is a communication fiber, and the smaller-core fiber is an erbium-doped ampli... | 12/24/1991 |
| 5027079 | Erbium-doped fiber amplifier This invention relates to an Erbium doped fiber amplifier having improved operating characteristics. Parameters which determine the operating characteristics of an erbium doped fiber amplifier are the concentration of erbium in the core of a fiber; the ra... | 06/25/1991 |
| 5007698 | Optical fiber amplifier/multiplexer An optical waveguide having a first cross section is thinned to constitute a thinned portion having a second cross section, as long as a predetermined length. Surface of the thinned portion is contacted with a laser glass member doped with a rare earth el... | 04/16/1991 |
| 4959837 | Doped optical fiber laser amplifier An erbium-doped fiber laser amplifier (1), characterized by the fact that said fiber (3) is doped to a concentration lying in the range 5 ppm to 50 ppm, that the length of said fiber lies in the range 250 m to 30 m depending on the selected concentration ... | 09/25/1990 |
| 4945315 | Method of and apparataus for projecting a laser beam into light amplifier A method of and an apparatus for projecting an incident laser beam into a broad contact-type light amplifier. The laser beam is projected after the intensity distribution of the laser beam is made to coincide with the electromagnetic field distribution in... | 07/31/1990 |
| 4938561 | Optical signal amplification with coupled fibers and optical pumping energy An optical fibre structure usable in amplifying optical signals, comprising a length of optical fibre (1) which includes two uniformally spaced monomode optical cores (2,4) located within a common cladding (6) so as to provide two optical guidance paths, ... | 07/03/1990 |
| 4712075 | Optical amplifier An optical amplifier particularly suitable for use in amplifying signals carried on optical fiber in a select communication band. The amplifier comprises a resonant optical waveguide cavity which has a core containing an active gain material with given ab... | 12/08/1987 |
| 4161944 | Laser system and method and laser amplifier for use therewith A laser system employs a laser amplifier doped with Neodymium ions having a planar input surface receiving a laser beam having a wavelength of 1.06 microns from a laser generator also employing a Neodymium doped crystal. The laser amplifier provides an ou... | 07/24/1979 |
| 4015217 | Means for producing and amplifying optical energy A laserable material with a host of non-gaseous, non-periodic atomic structure is provided. The host material is plastic and dispersed in solid solution within the plastic is a chelate of a rate earth metal. The material exhibits narrow-line fluorescence ... | 03/29/1977 |
