| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 398023000 | Transmitter | 11 |
| 20090047014 | Optical transmitting module and a method to sense a fluctuation of light emitted from the same - An optical transmitter is disclosed. The transmitter provides, in addition to a semiconductor laser diode as a light source, a variable polarizer with a Farady rotator and a polarization analyzer on an optical path of the laser diode. When the wavelength of the emitted light from the laser diode shifts, by adjusting the rotation angle of the Farady rotator by the current supplied to the coil so as to align the rotation angle with the polarization plane of the polarization analyzer, the wavelength shift of the laser diode may be estimated. Also, by comparing the optical magnitude between the initial of the operation and after the long-time operation at the output from the polarization analyzer after the alignment of the rotation angle of the Farady rotator, the degradation of the laser diode is detected. | 02-19-2009 |
| 20100215360 | OPTICAL NETWORK UNIT AND ABNORMAL DETECTING & POWER MONITORING METHOD THEREOF - An optical network unit includes an optical transmitter, an optical detector and a signal measurement module. The optical transmitter transmits an optical signal to an optical line terminal of a passive optical network system. The optical detector is utilized for monitoring the emission of the optical signal and transforming the received optical signal into a current signal. Then, the current signal is transformed into a voltage signal. The signal measurement module is connected to the optical detector for filtering and sampling the voltage signal and generating a sampling signal. The average output power of the optical transmitter can be obtained by averaging the voltage values of the sampling signal. Once the up-transmission data packet of the optical network unit exceeds the time interval of the allocated time slot, and the voltage values of the sampling signal have several points over a threshold, the optical transmitter is turned off. Furthermore, an abnormal detecting & power monitoring method of the optical network unit is also disclosed herein. | 08-26-2010 |
| 20110052186 | TRANSMISSION APPARATUS - A transmission apparatus switches to a line of one standby system upon occurrence of a fault on any one of n lines of a working system. The transmission apparatus includes a switching controller that when switching from a line of the working system to a line of the standby-system upon the occurrence of the fault and executing a given command to put the line causing the fault in a given state of line switching according to the given command, causes the working system to maintain the state of line switching according to the given command even after restoration from the fault. | 03-03-2011 |
| 20110058807 | TRANSMISSION APPARATUS, TRANSMISSION SYSTEM AND FAILURE DETECTION METHOD - To detect a transmission path cut-off or deterioration depending on the presence or absence of receiving a packet signal at a fixed time interval without transferring an OAM packet. At a transmitting side, a conversion section periodically sends a main signal without including a maintenance operation signal packet. At a receiving side, a transmission path failure detection device judges that a transmission path failure is detected if it is determined that the next main signal is not received for a preset time after receiving the main signal. An OAM processing section detects a state where the main signal is not transmitted to the opposed transmission apparatus or an idle state, based on the detection of the transmission path failure by the transmission path failure detection device, and sends a maintenance operation signal for notifying the transmission path failure to the opposed transmission apparatus when in the idle state. | 03-10-2011 |
| 20110076012 | OPTICAL NETWORK TERMINAL AND METHOD FOR DETECTING TRANSMISSION ERROR IN OPTICAL NETWORK TERMINAL - Provided are an optical network terminal (ONT) and a method for the ONT to detect an optical transmission error. The ONT is connected with an optical line termination (OLT) and constituting a passive optical network (PON), and includes an optical transmitter configured to transmit an optical signal to the OLT, an error detector configured to detect an error of the optical transmitter; and a controller configured to transmit an error message to the OLT through the optical transmitter when the error detector detects an error of the optical transmitter. | 03-31-2011 |
| 20120128348 | LIGHT-EMISSION ERROR PREVENTING CIRCUIT FOR OPTICAL TRANSMITTER - A subscriber-side optical network unit (ONU) includes a control LSI for outputting a data signal and a pre-bias signal at fixed intervals, an optical transmitter-receiver for producing optical output in response to these signals, and a light-emission error preventing circuit for preventing light-emission error. First and second light-emission error detecting circuits output an abnormality detection alarm signal when no rising edge occurs in the data signal and pre-bias signal for a prescribed period of time. An OR element, when receiving the abnormality detection alarm signal from at least one of the first and second light-emission error detecting circuits, supplies the optical transmitter-receiver with a shutdown signal and halts the optical output. | 05-24-2012 |
| 20140140692 | OPTICAL TRANSMISSION DEVICE, NODE DEVICE, OPTICAL TRANSMISSION METHOD, AND OPTICAL TRANSMISSION SYSTEM - An optical transmission device includes a transmission unit, a filter unit, a detection unit, and a control unit. The transmission unit superimposes identical superimposition signals of a frequency modulation method on a plurality of optical signals that have identical destinations and that have adjacent wavelengths, and transmits resultant signals as one communication signal. The filter unit filters part of two optical signals having adjacent wavelengths from among the plurality of optical signals included in the communication signal. The detection unit generates an electric signal of a detection level representing an optical intensity of the two optical signals that were filtered by the filter unit. The control unit controls timings of superimposing the superimposition signals on the two optical signals respectively by controlling the transmission unit so that variation in the detection level becomes smaller. | 05-22-2014 |
| 20140161442 | DATA SENDING OR RECEIVING METHOD, DEVICE, AND APPARATUS USED IN OPTICAL FIBER TRANSMISSION - The present invention relates to a fiber transmission field and provides a data sending or receiving method, device, and apparatus used in optical fiber transmission. The method includes: detecting data to be transmitted; encoding one bit pulse width to M parts if the to-be-transmitted data is 0, wherein the first part is a high-level, the later M−1 part is a low-level; encoding one bit pulse width to N parts if the to-be-transmitted data is 1, wherein the first part is a high level, and the later N−1 part is a low-level, the M is not equal to the N but both are integer which is greater than or equal to 2; and sending the encoded level signal. The embodiments of the present invention is for transmitting the binary data to be transmitted by the encoding way to changing the bit width of the data, namely, encoding the binary data 0 and 1 using different number of bits when the bit pulse width of the binary data 0 and 1 are the same, thereby two successive binary data 1 can not appear in the data transmission process, thus avoids signal jitters when the fiber transmits the data with a low speed. | 06-12-2014 |
| 20140270752 | OPTICAL TRANSMITTING DEVICE AND OPTICAL TRANSMISSION SYSTEM - An optical transmitting device includes: a laser diode to which a first or second driving current is provided; a controller to provide the laser diode with the first driving current to transmit an optical signal and with a plurality of second driving currents, to emit light, different from each other in magnitude during a stop of providing the first driving current; a measuring unit to measure an intensity of the light emitted by the laser diode; a calculator to calculate a threshold current of the laser diode, based on the intensities corresponding to the plurality of second driving currents measured by the measuring unit and magnitudes of the plurality of second driving currents; and a determination unit to determine a precursor of a sudden-death of the laser diode, based on an amount of variation in the threshold current calculated by the calculator during a specific period. | 09-18-2014 |
| 20150078741 | DEVICES AND METHODS TO PRODUCE AND RECEIVE AN ENCODED LIGHT SIGNATURE - A signature encoded light system includes at least one light source. The at least one light source is configured to output a first encoded light signature embedded within light in the visible spectrum. A light signature detection device is configured to receive a composite light signal formed with light from the at least one light source and ambient light. The light signature detection device is configured to identify the first encoded light signature. | 03-19-2015 |
| 20150365164 | OPTICAL TRANSMITTING DEVICE, FAULT DETERMINING METHOD AND FAULT DIAGNOSIS SYSTEM - An optical transmitting device includes: a light source; an optical modulator configured to modulate light from the light source based on an electric signal corresponding to transmission data, and output an optical signal based on the electric signal; a measuring section configured to measure power of the optical signal in each of measurement bands which are different from with each other and narrower than a frequency band of the modulated optical signal; a determining section configured to determine whether or not the measured power is within a power range in each of the measurement bands; and an output section configured to output fault information indicating a fault in the optical modulator when the measured power is not within the power range. | 12-17-2015 |
