| Patent Number |
Title Of Patent |
Date Issued |
| 7302178 |
System and method for measuring power of optical signals carried over a fiber optic link |
November 27, 2007 |
| A pilot tone generator receives optical energy from an optical communication medium carrying a plurality of optical signals. Each optical signal carries data modulated at a unique wavelength and further modulated with a unique identification signal. The identification signal has an a |
| 7119949 |
System and method for measuring an amount of error associated with an optical amplifier |
October 10, 2006 |
| An optical signal having optical energy is received at an optical amplifier. The optical signal may be separated into a low frequency segment and a high frequency segment. The high frequency segment and the low frequency segment may be processed in order to determine a low frequency |
| 7110682 |
Method and apparatus for maintaining a pre-determined ratio of a pilot tone power and a mean opt |
September 19, 2006 |
| Methods and apparatus for maintaining a pre-determined ratio of a pilot tone power and a total mean optical power of an optical signal are provided. One apparatus includes an optical source coupled to provide an optical signal in response to a DC bias and an AC bias corresponding to a |
| 7076164 |
System and method for measuring power of optical signals carried over a fiber optic link |
July 11, 2006 |
| A pilot tone generator receives optical energy from an optical communication medium carrying a plurality of optical signals. Each optical signal carries data modulated at a unique wavelength and further modulated with a unique identification signal. The identification signal has an a |
| 7039080 |
System and method for proportional control of multiple pump lasers |
May 2, 2006 |
| Optical energy is provided to an optical amplifier by a first and a second pump laser. The optical energy that is provided is used as a basis for generating a gain associated with the optical amplifier. An error associated with the first pump laser may be identified. One or more para |
| 6961172 |
System and method for measuring an amount of error associated with an optical amplifier |
November 1, 2005 |
| An optical signal having optical energy is received at an optical amplifier. The optical signal may be separated into a low frequency segment and a high frequency segment. The high frequency segment and the low frequency segment may be processed in order to determine a low frequency |
| 6937387 |
System and method for automatic recovery from a control loop failure |
August 30, 2005 |
| A voltage potential at a selected one or more inputs is controlled in order to produce a gain associated with an optical amplifier. One or more characteristics associated with a feedback loop coupled to the optical amplifier may be stored. A signal may be communicated to identify the |
| 6931214 |
Method and apparatus for maintaining a pre-determined ratio of a pilot tone power and a mean opt |
August 16, 2005 |
| Methods and apparatus related to maintaining a pre-determined ratio of a pilot tone power and a total mean optical power of an optical signal are provided. One method includes the steps of detecting the AC and DC components of an optical signal having a pilot tone signal. An amplitude |
| 6765714 |
System and method for measuring an amount of error associated with an optical amplifier |
July 20, 2004 |
| An optical signal having optical energy is received at an optical amplifier. The optical signal may be separated into a low frequency segment and a high frequency segment. The high frequency segment and the low frequency segment may be processed in order to determine a low frequency |
| 5717166 |
Method for combining transducer outputs |
February 10, 1998 |
| The invention is a system for combining the outputs of two transducers to provide a continuous reading over the combined ranges of the two transducers. The system applies an A.C. signal to the appropriate transducer; the steering for the excitation is controlled by the system micropr |
| 5661268 |
Method of recalibrating electronic scales |
August 26, 1997 |
| A method of recalibrating an electronic scale is disclosed which causes the scale to indicate accurate weight measurements regardless of variations in the physical and/or environmental conditions under which the scale is operating between a site of origin and a site of installation which |
| 5640334 |
Method of recalibrating electronic scales |
June 17, 1997 |
| Disclosed is a method of recalibrating an electronic scale to maintain accurate weight measurements of a scale regardless of variations in the physical and/or environmental conditions under which the scale is operating between a site of origin and a site of installation which tend to |
| 5550328 |
Electronic scale recalibrating device consisting of a moveable calibration weight |
August 27, 1996 |
| An electronic scale is disclosed having a device for recalibrating the scale from time to time after the scale is moved from the factory to a site of installation in order to adjust the scale for physical and/or environmental operating conditions which are different from those which |
| 5287748 |
Method and apparatus for changing the sensitivity of a transducer |
February 22, 1994 |
| A method of changing the sensitivity of a transducer includes applying to the transducer a cyclic excitation signal. The excitation signal has a number of recurring phases of different amplitudes. The transducer's output signal has a like number of recurring phases, each of which cor |
| 5121008 |
Circuit for generating or demodulating a square wave and other wave forms |
June 9, 1992 |
| A circuit for modulating or demodulating an input potential includes a first operational amplifier for receiving the input potential and a second operational amplifier for outputting an output potential. A resistor network is connected to the operational amplifiers. A switch with a first |
| 5088330 |
Square wave excitation of a transducer |
February 18, 1992 |
| A device for measuring a physical quantity includes a transducer and circuitry for exciting the transducer with an a.c. square wave. The excitation circuitry includes two amplifiers, a switch and a resistor network. The excitation circuitry provides a plus one gain when the switch is |
| 4862375 |
Magnetic power coupler for a vault cartridge |
August 29, 1989 |
| A vault cartridge having a data storage means for the storage of data therein. The cartridge has a size and a shape which is adapted for insertion within a vault receptacle coupled to a host system. The vault receptacle has a primary portion of a magnetic power coupling means made of |
| 4858138 |
Secure vault having electronic indicia for a value printing system |
August 15, 1989 |
| A value printing system is disclosed which provides for storing the indicia to be printed within a secure vault module. The vault module also provides for securely maintaining the system accounting data. Coupled to the vault module is a host module which in turn is coupled to a printer m |
| 4853523 |
Vault cartridge having capacitive coupling |
August 1, 1989 |
| A portable data storage module, or vault cartridge, having a data storage device and a plurality of conductive members which are disposed beneath an insulating outer surface of the module. In conjunction with corresponding conductive members in a host device, the corresponding conductive |
| 4813912 |
Secured printer for a value printing system |
March 21, 1989 |
| A system is disclosed for securing a device from invasive and noninvasive tampering, one such device being a printer assembly for use in a value printing system, such as a postal mailing system. The system is comprised of a Decryption Microcomputer operable for decrypting the input data |
| 4809185 |
Secure metering device storage vault for a value printing system |
February 28, 1989 |
| A value printing system, such as a postage metering system, is disclosed wherein the secure meter accounting registers are removably connected to the meter. The registers are maintained redundantly within two dissimilar types of non-volatile memory devices, the devices being enclosed wit |
| 4807059 |
Apparatus for receiving and securely retaining a device |
February 21, 1989 |
| An electromechanical vault cartridge receptacle has an opening for inserting a vault cartridge, the cartridge passing between a pair of laterally biased rollers which continuously engage asymmetrically contoured sided surfaces of the cartridge. A front surface edge of the cartridge b |
| 4802027 |
Data storage device coupled to a data storage interface |
January 31, 1989 |
| An electromechanical vault cartridge receptacle has an opening for inserting a vault cartridge, the cartridge passing between a pair of laterally biased rollers which continuously engage asymmetrically contoured sided surfaces of the cartridge. A front surface edge of the cartridge b |
| 4759282 |
Apparatus for supporting and conveying irregularly-shaped workpieces |
July 26, 1988 |
| Apparatus for processing a workpiece having a flexible upper wall. The apparatus includes a vacuum plenum having a bottom wall provided with a multiplicity of apertures. In addition, the apparatus includes workpiece feeding apparatus. The feeding apparatus includes container structure |
| 4464051 |
Spectrophotometer |
August 7, 1984 |
| Disclosed herein is a spectrophotometer which includes a source of radiation; an optical system for forming a beam of radiation from the source and directing it along a sample path and along a reference path, which paths come together at a location to form a combined path that imping |
| 4419575 |
Apparatus useful for positioning a light filter |
December 6, 1983 |
| An apparatus useful for positioning a light filter includes an incrementally stepped motor having the light filter affixed thereto. The apparatus also includes means for detecting a light signal and incrementing the motor in response thereto. |
| 4386852 |
Phase synchronization apparatus |
June 7, 1983 |
| A phase synchronization apparatus useful for synchronizing the sample signal and the demodulation signal at a spectrometer includes a stepper motor the position of which is controlled so that the desired phase synchronization is ensured. |
| 4035776 |
Data derandomizer for radiation imaging detection systems and method of operation |
July 12, 1977 |
| A data derandomizer for use in a scintillation imaging system. The imaging system produces data signals representing radiation events and presents them to a continuously operating video tape recorder for recording and subsequent playback to an imaging apparatus. The recorder can accept t |
