Patent application number | Description | Published |
20080204860 | Multistage Fiber Amplifier and Method For Adapting a Pump Power of a Multistage Fiber Amplifier - The invention relates to a multistage fibre amplifier having a first amplifying fibre (EDFI) and at least one further amplifying fibre (EDF | 08-28-2008 |
20090028562 | BIDIRECTIONAL OPTICAL AMPLIFIER ARRANGEMENT - The invention relates to a bidirectional optical amplifier array (VA) which is preferably used in a passive optical network (PON) system, is disposed between a first line termination (OLT) and a second line termination (ONU), and is penetrated by an optical downstream signal (OSD) in one direction and an optical upstream signal (OSD) in the opposite direction. Said optical amplifier array is composed of a first part with two branching and combining units (D | 01-29-2009 |
20090154931 | ARRANGEMENT FOR COMPENSATING RAMAN SCATTERING - A light beam which is used for transmitting a wavelength division multiplex signal is guided to a Bragg grating via an adjustable mirror. According to the angle of incidence of the light beam relative to the longitudinal axis of the Bragg grating, different transmission characteristic curves having different gradients are produced. As a result thereof, scattering of the wavelength division multiplex signal can be compensated. A second controllable mirror enables the damping to be adjusted. A control device effects a rapid correction of the scattering after data signals are connected or disconnected. | 06-18-2009 |
20090303577 | Optical Amplifier Configuration - An optical amplifier configuration for WDM (wavelength division multiplex) systems uses a common pump source connected to an input of an optical splitter deploying pump light via variable optical attenuators to a plurality of optical amplifiers. Control circuits determine individually the output powers of the amplifiers by varying the attenuations of the variable optical attenuators. Amplifier units based on PLC technology are implemented to reduce the size. | 12-10-2009 |
20100303473 | Receiver and Method for Operating Said Receiver - A receiver contains a phase demodulator and an electronic dispersion compensator that is electrically connected to the phase demodulator. The phase demodulator contains a delay that is equal to or less than 1 bit. Ideally the delay is an adjustable delay. Further, a method for operating the receiver described above is discussed. | 12-02-2010 |
20110085230 | METHOD FOR CONTROLLING AN ERBIUM DOPED FIBER AMPLIFIER (EDFA) AND AMPLIFIER ARRANGEMENT - The invention refers to a method for operating an amplifier with a first amplifier stage (A | 04-14-2011 |
20120182602 | OPTICAL FIBER AMPLIFIER COMPRISING AN EMBEDDED FILTER AND A CONTROL METHOD WITH IMPROVED FEEDFORWARD CONTROL PERFORMACE - An optical amplifier with improved transient performance has two amplifier stages and a gain flattening filter-inserted between the amplifier stages. A control unit generates a pump control signal for a common pump source pumping both amplifier stages. The pump control signal has a feed-forward component and a feedback component. After a drop of channels the feed-forward control circuit is responsible for the transient performance and fast gain stabilization. The characteristic of the gain flattening filter is taken into account in calculating an optimum feed-forward control signal. | 07-19-2012 |
20120229887 | OPTICAL FIBER AMPLIFIER WITH IMPROVED PERFORMANCE - A method for controlling a variation in gain in an optical amplifier stage and an optical amplifier. The optical amplifier stage includes a pumping device for providing pumping power and a control unit for determining a change in an input power of the optical amplifier. The method includes the steps of determining a change in an input power of the optical amplifier, adjusting a pumping power of the pumping device to a first power level for a predetermined period of time and adjusting the pumping power of the pumping device to a second power level. The second power level is able to drive the amplifier gain to a predetermined gain value after the change in the input power occurred. | 09-13-2012 |
20120230673 | MEASUREMENT OF ACCUMULATED CHROMATIC DISPERSION IN AN OPTICAL DATA TRANSMISSION NETWORK - A method of measuring accumulated chromatic dispersion in an optical data transmission network includes the following method steps: a) sending a first bit pattern with at least one first pulse at a first wavelength and a second bit pattern with at least one second pulse at a second wavelength over an optical fiber; b) receiving the first bit pattern and the second bit pattern; c) determining a relative temporal shift between the first bit pattern and the second bit pattern; and d) calculating the accumulated chromatic dispersion from the relative temporal shift. | 09-13-2012 |
20120275782 | METHOD AND APPARATUS FOR PREVENTING SIGNAL INTERFERENCE IN A PASSIVE OPTICAL NETWORK - A method removes signal interference in a passive optical network. The passive optical network includes an optical line terminal, a splitting unit coupled with the optical line terminal, an optical network unit coupled with the splitting unit, and an identification signal uniquely associated with the optical network unit. The method includes the steps of sending a first signal, detecting the first signal, comparing the detected first signal with an identification signal and decoupling the optical network unit from the splitting unit if the comparing step results in a mismatch. | 11-01-2012 |
20140186021 | OPTICAL COMMUNICATION SYSTEM, DEVICE AND METHOD FOR DATA PROCESSING IN AN OPTICAL NETWORK - An optical communication system, a method and a network device for an optical network are provided, wherein the device comprises a first port coupled with a first optical fiber link, a second port coupled with a second optical fiber link, the first port and the second port being configured to be coupled with respect to each other in case of a failure of the first optical fiber link or in case of a failure of the second optical fiber link | 07-03-2014 |