| Patent application number | Description | Published |
|---|
| 20090238574 | APPARATUS AND METHOD FOR MONITORING OPTICAL GATE DEVICE, AND OPTICAL SWITCH SYSTEM - An optical gate device transmits or interrupts input light according to control information. The optical gate device includes a light-receiver that obtains input and output optical powers of the optical gate device, and a monitor that obtains optical input and output characteristics of the optical gate device based on the control information and the monitored input and output optical powers, the optical input and output characteristics being equivalent to a time the optical gate device is controlled in a transmitted state. | 09-24-2009 |
| 20090252492 | OPTICAL COMMUNICATION SYSTEM , AND OPTICAL COMMUNICATION METHOD AND COMMUNICATION UNIT THEREFOR - A communication unit inhibits delay and jitter during network communication, improving the communication quality. For this purpose, the communication unit includes: a first terminator that terminates a communication channel in the first optical communication scheme established between the communication unit and another communication unit; a second terminator that terminates a signal in the second optical communication scheme; and a path setting switch that switches between a first signal path setting and a second signal path setting. | 10-08-2009 |
| 20090322233 | LIght detecting apparatus and output light intensity controller - A light detecting apparatus receives input light branched and output by a branching device, to calculate transmittance and reflectivity from the input light, acquires a wavelength corresponding to the calculated transmittance and reflectivity to calculate a gain value corresponding to input light intensity, acquires a driving current value corresponding to a calculated gain value and an acquired wavelength, and outputs an acquired driving current value. | 12-31-2009 |
| 20100266293 | RELAY APPARATUS, SIGNAL PROCESSING APPARATUS AND OPTICAL COMMUNICATION SYSTEM - A relay apparatus including: a first interface | 10-21-2010 |
| 20100321768 | OPTICAL AMPLIFIER, CONTROL CIRCUIT, AND METHOD OF CONTROLLING OPTICAL AMPLIFIER - An optical amplifier includes a semiconductor optical amplifier which has a gain that changes in accordance with a wavelength of input light and which generates a noise light power having different levels in accordance with a drive current, a detector that detects an optical power branched from output light of the semiconductor optical amplifier, and a controller that controls supply of the drive current based on the optical power such that an output light power of the semiconductor amplifier is a sum of a target signal light power and the noise light power. | 12-23-2010 |
| 20110116161 | OPTICAL AMPLIFIER, CONTROL CIRCUIT, AND OPTICAL AMPLIFIER CONTROL METHOD - An optical amplifier includes a semiconductor optical amplifier, a power monitor configured to monitor an optical power of out-of-signal-band noise output from the semiconductor optical amplifier, and a corrector configured to correct a relationship between a driving current for the semiconductor optical amplifier and a noise optical power based on the out-of-signal-band noise optical power monitored by the first power monitor. | 05-19-2011 |
| 20110116803 | TERMINAL APPARATUS, DATA TRANSMISSION SYSTEM AND DATA TRANSMISSION METHOD - There is provided a terminal apparatus including a message monitor to gather transmission request information from each of first and second terminating apparatus, a dynamic bandwidth allocation unit to allocate each transmission band in accordance with the gathered transmission request information, determine a size and an alignment position of a time slot in accordance with the allocated transmission band, determine a transmission start time of the time slot, and allocate an extinction period so as to stop a transmission of an optical signal between a time slot of the optical signal with the second transmission rate and a time slot following the time slot of the optical signal with the second transmission rate, and a MAC controller to generate a control frame for notifying each of the first and second terminating apparatus of the transmission start time and the size of the time slot. | 05-19-2011 |
| 20110286085 | OPTICAL AMPLIFIER - An optical amplifier includes an input port, an output port, an amplification medium, a light source, a monitor, and a controller. The amplification medium with which doped an rare-earth element for optical amplification is allocated on an optical path between the input port and the output port. The light source supplies the amplification medium with an excitation light. The monitor monitors a total power of an optical signal of each wavelength according to a monitor period which is longer than a transient response time of the amplification medium. The controller controls the light source so that a power of the excitation light is constant when a monitor value of the monitor is equal to or smaller than a predetermined threshold value and controls the light source so that an optical gain in the amplification medium is constant when the monitor value is larger than the predetermined threshold value. | 11-24-2011 |
