Fujitsu Corporation

Shinji Komiya

Norifumi Shukunami

Tomoaki Takeyama

Tomoyuki Kato

Makoto Hasegawa

Tsukasa Takahashi

Tatsuya Tsuzuki

Tomohiro Yamauchi

A network system includes a plurality of transmission devices, each of which being provided with a wavelength selective switch including a wavelength filter, configured to transmit an optical signal for each channel; and a management device configured to manage the plurality of transmission devices. The wavelength selective switch configured to enable band setting that widens a transmission band of an optical signal of a predetermined channel to the wavelength filter of an adjacent channel. The management device is further configured to calculate an OSNR of the optical signal based on power loss, calculate a bandwidth of the optical signal according to narrowing due to the wavelength filter, determine whether or not the OSNR and the bandwidth respectively satisfies a condition of transmission quality of the optical signal, and decide whether or not to cause the wavelength selective switch to perform the band setting based on a result of the determination.

Network system, management device, and management method

An optical transmission apparatus includes a splitter configured to split a first wavelength division multiplexed optical signal arranged in a first wavelength band and a second wavelength division multiplexed optical signal arranged in a second wavelength band, respectively, from an optical signal including the first wavelength division multiplexed optical signal and the second wavelength division multiplexed optical signal, a wavelength converter configured to convert a wavelength of the split second wavelength division multiplexed optical signal to generate a third wavelength division multiplexed optical signal to be arranged in the first wavelength band, an optical monitor configured to monitor power of each wavelength channel of the third wavelength division multiplexed optical signal, and a transmitter configured to transmit a monitoring result by the optical monitor to a transmission source node of the optical signal or a relay node of the optical signal.

Optical transmission apparatus, optical transmission method, and optical transmission system

An optical switch module includes: N first input ports to which a signal is input; M first output ports from which a signal is output; an M&#xd7;N switch to include N second input ports and M second output ports, and to set a path between the second input ports and the second output ports, the second output ports coupling with the first output ports, respectively; a test-signal input port to which a test-signal is capable of being externally input; an expansion port from which one of the test-signal and the signal from any one of the first input ports is output; and an optical switch to selectively connect at least one of the test-signal and the signal from any one of the first input ports to at least one of the expansion port and any one of the second input ports, wherein both N and M are natural numbers.

Optical switch module and optical relay apparatus and path expansion method that use optical switch module

A wavelength selective switch includes an input port and an output port, a wavelength demultiplexer that demultiplexes wavelength-multiplexed signal light into wavelengths in different optical paths, an optical-path controller that controls an array that has a plurality of switch elements, the plurality of switch elements switching all or a part of the wavelengths to be coupled from the input port to the output port, and an actuator driver that shifts the plurality of switch elements, based on a deviation of a center wavelength of a pass band from a reference wavelength.

Wavelength selective switch and method for correcting deviation of wavelength

An optical switch include a switch unit including a light reflection unit of which the reflection direction is changeable, the switch unit configured to optically connect an input port to an output port via the light reflection unit by changing the reflection direction of the light reflection unit; a determining light input unit configured to input into a first predetermined port a determining light for determining malfunctions in the light reflection unit; a light detection unit configured to detect the determining light from the output from a second predetermined port; and a malfunction determining unit configured to determine that abnormalities have occurred when the determining light is detected by the light detection unit.

Optical switch

The optical channel monitor includes a polarization adjuster, a wavelength divider, a polarization divider, a first intensity detector, and a second intensity detector. The polarization adjuster adjusts the plane of polarization of a first optical signal to a first direction and the plane of polarization of a second optical signal to a second direction. The wavelength divider divides each of the optical signals multiplexed on the first and second optical signals, in accordance with the wavelengths. The polarization divider divides each of the divided optical signals, based on the direction of the plane of polarization. The first intensity detector receives an optical signal whose direction of the plane of polarization is the first direction among the divided optical signals. The second intensity detector receives an optical signal whose direction of the plane of polarization is the second direction.

Optical channel monitor and optical transmission apparatus

A wavelength selective switch includes a polarization controller to control a polarization controller configured to control a polarization plane of a first optical signal as wavelength-multiplexed light input through a first input port, and control a polarization plane of a second optical signal as wavelength-multiplexed light input through a second input port such that the polarization plane of the second optical signal is aligned in a direction perpendicular to the polarization plane of the first optical signal, a demultiplexer to demultiplex optical signals multiplexed in the first and the second optical signals, a polarization separator to separate, an optical collector to collect the optical signals separated by the polarization separator, an optical signal reflector to reflect each of the optical signals collected by the optical collector; and a reflection controller to control the optical signal reflector in accordance with an incident position of the optical signal.

Wavelength selective switch and optical transfer device

An optical apparatus including input ports receiving WDM light, an output port, a first wavelength dividing unit that divides the lights input from the input ports into divided lights with different wavelengths, an optical signal processing unit that reflects the divided lights respectively to the first wavelength dividing unit, thereby light from one of the input ports is directed to the output port, for respective wavelength of the divided lights, a light source outputting a monitor light, a first coupler branching the monitor light to the monitor lights to the input ports, a second coupler branching the monitor lights output from the output port and outputs branched output monitor light, a second wavelength dividing unit that divides the branched monitoring lights into divided lights with different wavelengths, and a monitoring unit monitoring the divided lights from the second wavelength dividing unit.

Growing community of inventors

Sapporo, Japan

Shinji Komiya