Patent application number | Description | Published |
20090190925 | Optical transmission apparatus - In an optical transmission apparatus, a unit includes a first connection section, a second connection section, a branching section, a first detection section, and a second detection section. The first connection section connects to a first component. The second connection section connects to a second component. The branching section is disposed at a preceding stage of the second connection section and outputs signal light to the first component through the first connection section. The first detection section determines whether the first component receives the signal light output from the branching section. The second detection section is disposed at a subsequent stage of the second connection section and detects the signal light. | 07-30-2009 |
20090245786 | OPTICAL COMMUNICATION SYSTEM, METHOD OF MEASURING OPTICAL TRANSMISSION LINE IN THE OPTICAL COMMUNICATION SYSTEM, TRANSMITTING STATION, AND RECEIVING STATION - According to halt of a Raman pumping light source, a transmitting light power of a first light which is subject to receive a Raman gain is controlled to increase. In this state, a first input/output light power for a first light of an optical transmission line is measured, the first input/output light power being used for determining a reference of loss characteristic of the optical transmission line. A second input/output light power for a second light of the optical transmission line is measured, the second light not being subject to receive the Raman gain, the second input/output light power being used for determining a fluctuation of the reference. | 10-01-2009 |
20100079856 | Optical transmission system - In an optical transmission system, a controller acquires a noise light loss value, which indicates a loss that noise light output from an upstream-side optical amplifier undergoes during propagation to a downstream-side optical amplifier through an optical loss medium, and a signal beam loss value, which indicates a loss that a signal beam output from the upstream-side optical amplifier undergoes during propagation to the downstream-side optical amplifier through the optical loss medium, obtains, as a loss difference, a difference between the noise light loss value and the signal beam loss value and, when setting up the downstream-side optical amplifier, determines the gain of the downstream-side optical amplifier by compensating the loss difference. | 04-01-2010 |
20110229128 | OPTICAL NODE, OPTICAL NETWORK SYSTEM, AND METHOD FOR MEASURING POLARIZATION MODE DISPERSION - An optical node disposed along a transmission line that uses optical fiber. The optical node includes a first signal generator and a monitor. The first signal generator generates a first measurement signal for measuring polarization mode dispersion values and transmits the first measurement signal along the transmission line. The monitor detects a second measurement signal from the transmission line and measures polarization mode dispersion values by performing signal processing with respect to the second measurement signal. | 09-22-2011 |
20120121255 | OPTICAL SWITCHING DEVICE AND COMMUNICATIONS SYSTEM - An optical switching device includes a optical add/drop multiplexer that at least adds an optical signal into and/or drops an optical signal from wavelength division multiplexed light that is wavelength division multiplexed optical signals; a plurality of amplifiers that are disposed on optical paths included in the optical add/drop multiplexer and that can use supplied pump light to amplify the optical signals; an optical source that generates the pump light; and an optical switch that supplies the generated pump light to any one of the amplifiers. | 05-17-2012 |
20120128347 | Optical switching device, optical add device, and optical drop device - An optical switching device includes plural wavelength selective switches that respectively have a first port and a plurality of second ports; and an optical coupler that has a plurality of third ports on an input-side or an output-side, respectively optically coupled to the first ports of the wavelength selective switches. | 05-24-2012 |
20120237211 | OPTICAL RECEIVING APPARATUS - There is provided an optical receiving apparatus, including a receiver configured to perform coherent reception by mixing first light of a received optical signal and second light generated by a local oscillator, a monitor configured to monitor a first frequency of the first light, and a controller configured to control a second frequency of the second light, based on a difference between the first frequency and the second frequency so as to reduce the difference. | 09-20-2012 |
20120301137 | ERRONEOUS OPTICAL FIBER CONNECTION DETECTING METHOD AND NODE DEVICE - A node device includes a data pattern generator configured to generate different fixed patterns for a plurality of ports to insert the generated fixed patterns into optical signals output from a plurality of optical transmitters, an optical switch configured to switch outgoing paths of the optical signals to output the optical signals as a multiplexed signal from one of the ports, a detector configured to detect a frequency spectrum of the multiplexed optical signal, and a management part configured to monitor a peak frequency of the detected frequency spectrum to detect an erroneous optical fiber connection associated with the optical transmitters based on peak frequencies corresponding to the different fixed patterns for the respective ports. | 11-29-2012 |
20120301141 | WAVELENGTH REALLOCATION METHOD AND NODE DEVICE - A method for reallocating a wavelength in an optical wavelength multiplexer transmission system is disclosed. The method includes switching a supply of a first channel electric signal from a first optical transmitter device to a second optical transmitter device, the first optical transmitter device converting the first channel electric signal into an optical signal of a first wavelength, and the second optical transmitter device converting the first channel electric signal into an optical signal of a second wavelength differing from the first wavelength, and transmitting the optical signal of the second wavelength output from the second optical transmitter device. | 11-29-2012 |
20130330073 | BIDIRECTIONAL MONITOR MODULE, OPTICAL MODULE, OPTICAL ADD-DROP MULTIPLEXER, AND OPTICAL SYSTEM - A bidirectional monitor module includes a 2×2 optical coupler configured to output input light that is input from a first port to a second port and drop the input light input from the first port to a third port and also output input light that is input from the second port to the first port and drop the input light input from the second port to a fourth port; an optical output unit configured to output one of light that is dropped and output from the third port and light that is dropped and output from the fourth port; and a monitor unit configured to monitor optical power of the light output from the optical output unit. | 12-12-2013 |
20150086192 | DETERMINING METHOD, DETERMINING OPTICAL MODULE, AND OPTICAL COMMUNICATION APPARATUS - In order to determine a connection state of an optical fiber that connects a transmitting terminal and a plurality of receiving terminals, a test signal having a wavelength corresponding to a wavelength of an optical signal capable of being received at one receiving terminal among the plurality of receiving terminals is generated by clipping a portion of amplified spontaneous emission light. The generated test signal is transmitted through the optical fiber. Optical power of the test signal is detected at the one receiving terminal. The connection state of the optical fiber is determined based on a detection result of the optical power of the test signal. | 03-26-2015 |