Patent application number | Description | Published |
20100271682 | BIAS CONTROLLER - A bias controller and a method for controlling the bias of an electro-optic modulator are provided. In the method, for a received indication of modulator temperature, steps are provided for accessing a look-up table to determine a corresponding value of bias voltage, for a required bias point, to apply to the modulator. If no such value is stored, additional steps are provided to generate a pilot tone for input to the modulator and to recognize, from the signal content of a modulated optical signal output by the modulator, operation of the modulator at the required bias point, adjusting the value of bias voltage being applied to the modulator as required. When operation at the required bias point is recognized, the respective value of bias voltage for that modulator temperature is stored in the look-up table. The same method is provided to configure a bias controller in respect of a given modulator, if necessary ab initio. | 10-28-2010 |
20150110436 | CONTROLLING BIAS VOLTAGES FOR OPTICAL MODULATORS - Methods and apparatus for controlling a bias voltage supplied to an optical modulator, the modulator comprising a biasable component, the biasable component being configurable to be biased by application of the bias voltage ( | 04-23-2015 |
20150110437 | CONTROLLING BIAS VOLTAGES FOR OPTICAL MODULATORS - Methods and apparatus for controlling a bias voltage ( | 04-23-2015 |
20150124309 | FINDING BIAS VOLTAGES FOR OPTICAL MODULATORS - Methods and apparatus for finding a bias voltage ( | 05-07-2015 |
20150215589 | APPARATUS AND METHODS FOR USE WITH OPTICAL ROTATING JOINT - A method and apparatus for operating an optical rotating joint ( | 07-30-2015 |
20150253509 | APPARATUS AND METHODS FOR USE WITH OPTICAL ROTATING JOINT - A method and apparatus for operating an optical rotating joint ( | 09-10-2015 |
20150253512 | PROVISION OF AN OPTICAL ROTATING JOINT INSTALLATION - An optical rotating joint installation; comprising: a drive shaft for a rotating interface, the drive shaft comprising a hollow central bore; and an optical rotating joint located in the hollow central bore. The proportion of the cross-sectional area of the material retained in the annular section of the drive shaft is preferably greater than or equal to 50%, more preferably 60%, yet more preferably 75%. The diameter of the hollow central bore is preferably less than or equal to 20 mm, more preferably 16 mm. The optical rotating joint installation may be provided as a retro-fit to replace an existing solid drive shaft that does not have an optical rotating joint, for example by hollowing out the existing solid drive shaft or by replacing the existing solid drive shaft with a drive shaft with a hollow central bore. | 09-10-2015 |
Patent application number | Description | Published |
20090162774 | Toner and Manufacturing Process therefor - The invention provides a process for the manufacture of a toner which comprises the steps of:
| 06-25-2009 |
20090269690 | Toner and Manufacturing Process Therefor - The invention provides a process for the manufacture of a toner which comprises the steps of:
| 10-29-2009 |
20100129751 | Toner, Process for Making Toner and Use of Toner - A process for the manufacture of a toner comprising toner particles which comprise at least resin and colorant, the process comprising the steps of: providing a mixed dispersion of at least primary resin particles and primary colorant particles stabilised by two or more surfactants in a liquid medium, the surfactants comprising at least a first ionic surfactant and a second ionic surfactant of the same polarity as the first ionic surfactant, wherein the first and second ionic surfactants have different linear chain lengths; and causing the primary particles to associate. | 05-27-2010 |
20100173244 | Toner Comprising Polyester, Process for Making the Toner and Uses Thereof - A process for preparing a toner comprising a binder resin and a colorant, wherein the binder resin comprises a polyester resin having an acid value greater than 5 mg KOH/g, the process comprising: providing an aqueous dispersion of polyester resin particles stabilised by an ionic surfactant and then associating the polyester resin particles. | 07-08-2010 |
20100190102 | Toner Comprising Polyester, Process for Making the Toner and Uses Thereof - A process for preparing a toner comprising a binder resin and a colorant, wherein the binder resin comprises a polyester resin having an acid value (AV) greater than 5 mg KOH/g, the process comprising: providing an aqueous dispersion of self-dispersed polyester resin particles and associating the polyester resin particles by means of a change in the pH of the dispersion. | 07-29-2010 |
20100255414 | Toner, Process for Making Toner and Use of Toner - A process for the manufacture of a toner comprising toner particles which comprise at least resin and colorant, the process comprising the steps of: providing a mixed dispersion of at least primary resin particles, primary colorant particles and a carboxy functional compound of Formula (1) and/or a salt thereof and/or a complex thereof in a liquid medium, | 10-07-2010 |
Patent application number | Description | Published |
20090047023 | Data communications system - A base station is provided for communicating data to a mobile terminal unit by means of at least one antenna unit, wherein the at least one antenna unit is linked to the base station by means of at least one optical fibre and the at least one antenna unit is operable to communicate wirelessly with the mobile terminal unit. The base station comprises an optical transmitter for transmitting modulated data signals to the at least one antenna unit for wireless transmission, an optical receiver for receiving modulated data signals forwarded by the at least one antenna unit and a demodulator for demodulating received modulated data signals. The optical transmitter comprises a first optical modulator arranged to modulate an optical carrier with a radio frequency oscillator signal to generate an optical oscillator signal, a second optical modulator, coupled optically to the first optical modulator, operable to modulate the optical oscillator signal with an input data signal of a predetermined frequency to generate a downlink optical data signal and an optical output for directing the downlink optical data signal to the at least one antenna unit by means of the at least one optical fibre. | 02-19-2009 |
20100054757 | BIAS CONTROLLER FOR AN OPTICAL MODULATOR - A bias controller for an optical modulator. The modulator includes a bias electrode that is operable when appropriately biased by an applied bias voltage to configure the modulator to operate at quadrature, and the bias controller includes: a generating arrangement for generating power signals indicative of the optical output power of the modulator; and a processor operably connected to the generating arrangement and said bias electrode and arranged to receive said power signals from said generating arrangement and to control the bias voltage applied to said bias electrode. The processor is configured to vary the bias voltage applied to said bias electrode and to determine from power signals received from said generating arrangement a peak optical output power for said modulator, and to determine in dependence upon said peak optical power a target optical power for quadrature with reference to a store of predetermined values for peak output power and respective corresponding values of target optical power for quadrature. Other embodiments relate to a multi-channel bias controller, and to a method for controlling voltage bias in a modulator. | 03-04-2010 |
20110129220 | MULTI-FUNCTION ARRAY ANTENNA - An optical routing network provides function-specific routing, in the optical domain, of radio frequency (RF) signals between inputs to the network and function-specific outputs from the network. RF signals input to the network may comprise signals received by elements of a multi-function array antenna for routing to function-specific receiving equipment or signals from function-specific transmitting equipment for routing to selected elements of the antenna for transmission. The optical routing path through the optical routing network is chosen by selecting one or more predetermined optical carrier wavelengths in the optical routing network, each carrier wavelength being associated with a particular function of the antenna. The optical routing network comprises opto-electronic modulators for modulating the selected optical carrier or carriers with received radio frequency (RF) signals and wavelength division multiplexing (WDM) devices for separating and directing modulated carriers to respective optical outputs according to the selected carrier wavelengths. However, if routing in respect of only one function is required at any one time, a single carrier wavelength may be used and optical switches may be used in place of WDM devices to achieve the required optical routing on a time division basis, if preferred. | 06-02-2011 |