| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 398160000 | Using optical amplifier | 9 |
| 20080232817 | Waveform shaping apparatus, optical transmission system, and waveform shaping method - A waveform shaping apparatus includes a quantum dot optical amplifier in which an amplification factor of input signal beams saturates if the optical power of the signal beams is equal to or greater than a predetermined value; and a quantum dot saturable absorber in which an absorption factor of the input signal beams saturates if the optical power of the signal beams is under a predetermined value. The quantum dot optical amplifier and the quantum dot saturable absorber are connected in series with a transmission path of the signal beams, and shape the waveform of the signal beams. Voltages applied to the quantum dot optical amplifier and the quantum dot saturable absorber, respectively, are adjusted based on the optical power of the signal beams. | 09-25-2008 |
| 20080310859 | OPTICAL PULSE AMPLICATION APPARATUS AND METHOD - A method and apparatus for producing a series of amplified optical pulses from a series of input optical pulses. The method includes creating a set of local optical pulses from a series of input optical pulses, the set of local optical pulses being applied to the input of an optical amplifier and having different amplitudes arranged in a graded order. The set of local optical pulses are amplified by an optical amplifier to have a significantly amplified first local optical pulse that is removed from the set of local optical pulses and output as a part of the series of amplified optical pulses. After removing the significantly amplified first local optical pulse, the set of local optical pulses is recreated by adding a new optical pulse from the series of input optical pulses to the end of the set of local optical pulses; and the recreated set of local optical pulses is routed back to be applied to the input of the optical amplifier to continue producing the series of amplified optical pulses. The formed set of local optical pulses having different (graded) amplitudes arranged in a descending order is configured such that the first local optical pulse has a much higher peak power before the optical amplifier gets saturated. | 12-18-2008 |
| 20090129785 | OPTICAL AMPLIFYING DEVICE AND OPTICAL TRANSMISSION SYSTEM - An optical amplifying device includes an amplifying unit for amplifying an optical signal using stimulated emission; a filter unit for attenuating at least part of a band of an output of the amplifying unit other than a main signal band of the optical signal; and an amplification control unit for controlling the amplifying unit on the basis of an output of the filter unit, the amplification control unit having, as a mode for controlling the amplifying unit, an amplified spontaneous emission output mode for causing the amplifying unit to operate, with the optical signal not being input to the amplifying unit, and for causing the filter unit to filter the amplified spontaneous emission output from the amplifying unit and to output the filtered amplified spontaneous emission to outside. | 05-21-2009 |
| 20090190934 | FIBER COMMUNICATION SYSTEM, FIBER AMPLIFIER, AND METHOD FOR FABRICATING FIBER AMPLIFIER - The present invention discloses a fiber amplifier, a fabricating method thereof, and a fiber communication system. The fiber amplifier includes at least a pump laser, at least a gain medium and at least an integrated optical component. The integrated optical component includes multiple optical input/output ports, and the optical input/output ports are connected to the pump laser or gain medium directly or indirectly. The present invention may better address problems of unstable performance and difficulty in reducing the size of components in the prior art where fiber amplifiers are formed by a number of discrete components with many fiber fusion splices. In addition, the present invention may reduce the production complexity and costs of fiber amplifiers, and improve the productivity of fiber amplifiers. | 07-30-2009 |
| 20100272445 | GAIN AND SIGNAL LEVEL ADJUSTMENTS OF CASCADED OPTICAL AMPLIFIERS - An optical amplification device which includes first and second optical amplifiers, and a controller. The first optical amplifier receives a light and amplifies the received light. The second optical amplifier receives the light amplified by the first optical amplifier, and amplifies the received light. When a level of the light received by the first optical amplifier changes by Δ, the controller controls a level of the light received by the second optical amplifier to change by approximately −Δ. In various embodiments, the controller causes the sum of the gains of the first and second optical amplifiers to be constant. In other embodiments, the optical amplification device includes first and second optical amplifier and a gain adjustor. The gain adjustor detects a deviation in gain of the first optical amplifier from a target gain, and adjusts the gain of the second optical amplifier to compensate for the detected deviation. | 10-28-2010 |
| 20100284701 | System And Method For Tunable Chromatic Dispersion Compensation - One embodiment sets forth a technique for measuring chromatic dispersion using reference signals within the operational range of amplifiers used to refresh data signals. One red/blue laser pair in the transmission node is used for measuring dispersion and chromatic dispersion compensation is added at each line node in the system. Since reference and data signals propagate through each amplifier, the reference signals used to measure chromatic dispersion receive the same dispersion compensation (and will have the same residual dispersion) as the data signals. Therefore, any residual dispersion in the data signals will manifest itself in downstream dispersion measurements and, thus, can be corrected. The tunable dispersion compensator in each line node may be set to compensate for the measured dispersion, thereby compensating for both the chromatic dispersion of the link connecting the current node to the prior node and any uncorrected residual dispersion from prior nodes. | 11-11-2010 |
| 20110020011 | Amplifier, Optical Receiver Circuit, Optical Module and Data Exchange System - When a conventional optical receiver circuit is used, it is difficult to achieve noise reduction or provide a multichannel capability due to a considerable circuit area increase. Disclosed is an amplifier for optical communications that includes a CMOS inverter, which has a PMOS transistor and an NMOS transistor; an input terminal, which inputs a signal into the CMOS inverter; an output terminal, which outputs a signal from the CMOS inverter; a power supply, which is connected to the CMOS inverter; a first element and a second element, which are respectively connected to the CMOS inverter; and two types of power supply paths, which are in opposite phase to each other. | 01-27-2011 |
| 20130243441 | METHOD TO CONTROL OPTICAL RECEIVER IMPLEMENTED WITH SEMICONDUCTOR OPTICAL AMPLIFIER AND METHOD TO CONTROL OPTICAL COMMUNICATION - A method to control an optical receiver implemented with a semiconductor optical amplifier (SOA) is disclosed. The SOA has a p-n junction operable in a PD mode when it is supplied with a zero or reverse bias. The SOA detects the magnitude of the incoming light and the driving current supplied thereto is adjusted based on thus detected magnitude of the incoming light such that the outgoing light provided to the PD has a magnitude within a preset range. | 09-19-2013 |
| 20160149648 | OPTICAL RECEIVER WITH THRESHOLD CONTROL BLOCK - The invention concerns an optical receiver comprising: a photodiode ( | 05-26-2016 |
