| Patent Number |
Title Of Patent |
Date Issued |
| 6303922 |
Range-switching optical receiver with high sensitivity and wide dynamic range |
October 16, 2001 |
| At least two innovations are used to overcome the limitations of conventional transimpedance or high impedance optical receiver front end amplifiers. The innovations are a) multiple stage equalization of a high-feedback resistor, low-gain transimpedance amplifier to obtain high sensi |
| 6288814 |
In-line predistorter for linearization of electronic and optical signals |
September 11, 2001 |
| An electronic circuit provides a substantially linear output from a nonlinear transmission device such as a laser. The input signal to the nonlinear device is applied to an in-line electrical path coupled to the nonlinear device. In the in-line predistorter of the present invention, |
| 6252693 |
Apparatus and method for reducing impairments from nonlinear fiber effects in 1550 nanometer ext |
June 26, 2001 |
| Nonlinear optical effects, such as stimulated Brillouin scattering, limit the power density of an optical signal that can be launched into an optical fiber. The SBS threshold is increased by a triple frequency modulation scheme, wherein an optical source is modulated by a low frequen |
| 6091864 |
Linear optical modulator for providing chirp-free optical signals |
July 18, 2000 |
| A dual stage optical modulator is disclosed that uses optical predistortion to achieve a high degree of linearity and also provides signals having substantially no residual phase modulation, or chirp. The modulator allows fiber optic transmission over fibers having a zero dispersion wave |
| 5798854 |
In-line predistorter for linearization of electronic and optical signals |
August 25, 1998 |
| An electronic circuit provides a linear output from a nonlinear transmission device such as a laser. Second and higher order distortion of the nonlinear device is compensated by applying a predistorted signal equal in magnitude and opposite in sign to the real and imaginary component |
| 5515469 |
Fiber optic connector housing |
May 7, 1996 |
| A fiber optic RF signal distribution system has a plurality of antenna stations, each station including an RF antenna. A central RF signal distribution hub receives and transmits signals external to the system. A pair of optical fibers connects each antenna station directly to the di |
| 5457557 |
Low cost optical fiber RF signal distribution system |
October 10, 1995 |
| A fiber optic RF signal distribution system has a plurality of antenna stations, each station including an RF antenna. A central RF signal distribution hub receives and transmits signals external to the system. A pair of optical fibers connects each antenna station directly to the di |
| 5453868 |
Suppression of noise and distortion in fiber-optic systems |
September 26, 1995 |
| Noise and distortion due to scattering and reflection in a fiber-optic communications system are suppressed by modulating the optical frequency of (chirping) a laser light source to broaden the spectrum of the laser light output. The broader spectrum spreads the noise produced by an |
| 5430569 |
Suppression of noise and distortion in fiber-optic systems |
July 4, 1995 |
| Noise and distortion due to scattering and reflection in a fiber-optic communications system are suppressed by modulating the optical frequency of (chirping) a laser light source to broaden the spectrum of the laser light output. The broader spectrum spreads the noise produced by an |
| 5363056 |
Circuit for linearization of amplified electronic signals |
November 8, 1994 |
| An electronic circuit provides a linear output from an amplifying device, such as a hybrid push-pull amplifier, which has inherent distortion. In a preferred embodiment, the distortion of the hybrid amplifier is compensated by nesting a pair of hybrid push-pull amplifiers within a pu |
| 5278688 |
Fault tolerant fiber optic transmission system |
January 11, 1994 |
| A fault tolerant fiber optic system has a plurality of lasers modulated by the same signal source. The signals from the lasers are conveyed to an optical coupler by single mode optical fibers. The signals from all of the lasers are mixed in the optical coupler, producing an output signal |
| 5252930 |
Predistorter for linearization of electronic and optical signals |
October 12, 1993 |
| An electronic circuit provides a linear output from an amplitude modulated transmission device such as an amplifier or a semiconductor laser which has inherent distortion. The distortion of the nonlinear device is compensated by applying a predistorted signal with distortion equal in |
| 5179461 |
Broadband optical receiver with passiner tuning network |
January 12, 1993 |
| This optical receiver is capable of receiving broadband R-F modulated signals transmitted over fiber-optic cable. The receiver comprises a photodiode impedance matched to the input of an low noise, low distortion amplifier by an impedance matching transformer. A passive tuning network |
| 5132639 |
Predistorter for linearization of electronic and optical signals |
July 21, 1992 |
| An electronic circuit provides a linear output from an amplitude modulated transmission device such as a semiconductor laser which has inherent distortion. The distortion of the nonlinear device is compensated by applying a predistorted signal equal in magnitude and opposite in sign to |
| 5127072 |
Laser module with compliant optical fiber coupling |
June 30, 1992 |
| A small module for converting an electrical signal to a modulated light signal on an optical fiber comprises a housing, a laser mounted on a laser substrate within the housing, a GRIN lens and an optical isolator downstream from the laser, and a precision capillary for holding an opt |
| 4992754 |
Predistorter for linearization of electronic and optical signals |
February 12, 1991 |
| An electronic circuit provides a linear output from an amplitude modulated transmission device such as a solid state laser which has inherent distortion. The distortion of the nonlinear device is compensated by applying a predistorted signal equal in magnitude and opposite in sign to |
| 4942585 |
High power semiconductor laser |
July 17, 1990 |
| A heterostructure semiconductor laser provides high power by having a wide output facet so that the power density at the output facet is low enough to avoid catastrophic optical mirror damage. Single transverse mode oscillation occurs in the center of a pumped trapezoidal gain medium lay |
| 4856017 |
Single frequency high power semiconductor laser |
August 8, 1989 |
| A distributed feedback heterostructure semiconductor laser provides a single frequency at high power by having a wide output facet so that the power density at the output facet is low enough to avoid catastrophic optical mirror damage. Oscillation is obtained in the center of a pumped |
| 4843611 |
Superluminescent diode and single mode laser |
June 27, 1989 |
| A buried heterostructure window device has an elongated layer of gain medium surrounded by a lower index of refraction medium for guiding light along the length of the gain medium. A window and an antireflective layer are deposited on the output end of the gain layer to minimize reflecti |
| 4833683 |
Coherent coupling of optical gain elements |
May 23, 1989 |
| Coherent coupling of a plurality of reflection type optical gain elements with a seeding laser is provided by illuminating the optical gain elements with fanned laser light scattered from a photorefractive medium. The reflection type optical gain elements have an anti-reflective end near |
| 4802178 |
High speed fiberoptic laser module |
January 31, 1989 |
| A small module contains means for converting an electrical signal to a correspondingly modulated light signal on an optical fiber. Frequency of the signal can range from D.C up to many gigahertz. A semiconductor laser diode is mounted on a high thermal conductivity substrate on a the |
| 4764934 |
Superluminescent diode and single mode laser |
August 16, 1988 |
| A buried heterostructure window device has an elongated layer of gain medium surrounded by a lower index of refraction medium of guiding light along the length of the gain medium. A window and an antireflective layer are deposited on the output end of the gain layer to minimize reflectio |
