Abstract: The present invention is a wavelength superimposing device that can restrain a system scale and further reduce an optical transmission loss, while broadcasting a video signal light in a WDM network system, a manufacturing method therefor, and the WDM network system, and comprises a filter device that reflects some light of an input wavelength-multiplexed light in a direction different from an optical path direction of the input wavelength-multiplexed light and transmits a light of remaining wavelengths, a first optical system in which a reflected light reflected by the filter device is re-incident on a plurality of incident positions on a reflecting surface of the filter device, and a second optical system in which a transmitted light from the filter device is spectrally separated for each wavelength and each separated light is incident on the plurality of incident positions from a transmission surface of the filter device.

Abstract: A micro electro mechanical system device includes a fixed electrode that includes a first electrode group, and a movable electrode that moves with respect to the fixed electrode as voltage is applied and includes a second electrode group that opposes the first electrode group, wherein electrodes of at least one among the first electrode group and the second electrode group are connected via a resistor.

Abstract: An optical transmission system (1) alters quantity of incident light by reflecting an optical signal by a micro mirror (11) to enter an optical fiber (13) and by controlling an angle of the micro mirror (11), so that attenuation of the optical signal is controlled. An optical filter (14) is disposed between the micro mirror (11) and the optical fiber (13), for correcting a relationship between a control angle or control voltage of the micro mirror (11) and attenuation of the optical signal to be close to a linear relationship.

Abstract: An optical switching apparatus changes an angle of a movable mirror reflecting light input to the optical switching apparatus and performs switching control for switching an output port that outputs the light reflected by the movable mirror. The optical switching apparatus includes an acquiring unit that acquires intensity information concerning the light output from the output port; a controller that based on the intensity information acquired by the acquiring unit and by adjusting the angle of the movable mirror, performs intensity control of the light output; a detector that based on the intensity information, detects a fluctuation greater than a predetermined fluctuation amount of the light output; and a suspending unit that suspends the intensity control by the controller, if the detector detects the fluctuation.

Abstract: An optical communication apparatus includes a receiver configured to receive an optical signal transmitted from an optical transmitting apparatus; a detector configured to detect a predetermined pattern signal included in the optical signal; a calculator configured to calculate, based on a waveform of the predetermined pattern signal, an amount of dispersion of the predetermined pattern signal; and a compensator configured to compensate for dispersion according to the amount of dispersion.

Abstract: A micro electro mechanical system device includes a fixed electrode that includes a first electrode group; and a movable electrode that moves with respect to the fixed electrode as voltage is applied and includes a second electrode group that opposes the first electrode group. Further, electrodes of at least one among the first electrode group and the second electrode group are connected via a resistor.

Abstract: A demodulator includes: a splitter that branches a differential phase shift keying optical signal into a first branched optical signal passing through a first optical path and a second branched optical signal passing through a second optical path; a multiplexer that multiplexes the first branched optical signal having passed through the first optical path and the second branched optical signal having passed through the second optical path and makes interference between the first branched optical signal and the second branched optical signal; and a double refraction medium that reduces difference between phase differences between each polarized wave between the first branched optical signal and the second branched optical signal multiplexed by the multiplexer.

Abstract: In an optical switch controller, in order that residual vibration at movement control of a movable body such as a tilt mirror can be reduced and controlled with high accuracy, a processing unit outputs a driving signal for controlling the angle of the tilt mirror, the driving signal is D/A converted by a D/A converter and then is changed to a high-voltage signal by a high-voltage amplifier to be supplied to the tilt mirror, the electrostatic capacity of the tilt mirror changes corresponding to angle change of the tilt mirror, a mirror-angle detecting unit detects the electrostatic capacity and feeds back it as a correction value to a processing unit, and the processing unit corrects the driving signal using a correction value obtained when the angle of the tilt mirror is actually changed.

Abstract: In an optical telecommunication system in which an intensity of an arriving optical signal is different for each packet, detected is an optical intensity for each packet with little error. For this purpose, contrived is to detect an average optical intensity across header parts for each packet by focusing on the fact that the header part comprising the preamble and delimiter of a packet is in a bit pattern which includes approximately the same numbers of “0” and “1”.

Abstract: In an optical switch controller, in order that residual vibration at movement control of a movable body such as a tilt mirror can be reduced and controlled with high accuracy, a processing unit outputs a driving signal for controlling the angle of the tilt mirror, the driving signal is D/A converted by a D/A converter and then is changed to a high-voltage signal by a high-voltage amplifier to be supplied to the tilt mirror, the electrostatic capacity of the tilt mirror changes corresponding to angle change of the tilt mirror, a mirror-angle detecting unit detects the electrostatic capacity and feeds back it as a correction value to a processing unit, and the processing unit corrects the driving signal using a correction value obtained when the angle of the tilt mirror is actually changed.

Abstract: The present invention is a method of transmitting data of different bit rates in a simple manner and, if positive minimal multiples whose multiple operation values on the bit time lengths 1/Ai for a plurality of communication bit rates Ai become common are minimal multiples ai respectively, an optical line terminal constitutes a time division multiplex signal composed of a first data area having a bit rate Ai/ai and including frame synchronization information and a second data area in which packets addressed to each optical network unit of the bit rate Ai are time division multiplexed, and transmits the time division multiplex signal to a plurality of optical network units via a branching/multiplexing means.

Abstract: In an optical transmission apparatus, a light-emitting laser varies its output wavelength when applied with a wavelength control signal for switching wavelengths. A wavelength controller outputs the wavelength control signal, and a filter unit subjects the wavelength control signal to a filtering process to remove high-frequency noise superimposed on the wavelength control signal. The filter unit stops the filtering process during the wavelength control and executes the filtering process during the operation.

Abstract: A light source supplies optical signal to an optical switch and a detector detects light receiving level. A control unit changes a deflection control amount for changing an angle of a tilt mirror, and outputs the deflection control amount to a driving unit. When an input and an output ports are same, optical offset of the tilt mirror is calculated based on optimal angle at which the light detector detects an optimal point of the light receiving level. Whenever the input and the output port are different, a structure parameter of the tilt mirror is calculated based on the optical offset and the optimal angle. The optical offset and the structure parameter are stored in a memory as a test result.

Abstract: An electrode includes a fixed electrode and a movable electrode. The electrode drives a mirror disposed on the side of the movable electrode by generating electrostatic force between the fixed electrode and the movable electrode when voltage is applied. The fixed electrode and the movable electrode are formed so that a distance between the fixed electrode and the movable electrode increases as an overlapping area between the fixed electrode and the movable electrode increases.

Abstract: A control section of an optical switch calculates information relating to a polarization amount in an insulating film at each predetermined time, to update the information relating to the polarization amount in the insulating film. On the other hand, when a drive voltage is applied to a MEMS mirror, an initial value of the drive voltage corresponding to an input setting command is read out from an initial value memory, and also, the information relating to the polarization amount in the insulating film is read out from the polarization amount memory, and the initial value of the drive voltage is corrected according to the read information relating to the polarization amount in the insulating film, to thereby set a new drive voltage, and the new drive voltage is applied on electrodes of the MEMS mirror.

Abstract: A light source supplies optical signal to an optical switch and a detector detects light receiving level. A control unit changes a deflection control amount for changing an angle of a tilt mirror, and outputs the deflection control amount to a driving unit. When an input and an output ports are same, optical offset of the tilt mirror is calculated based on optimal angle at which the light detector detects an optimal point of the light receiving level. Whenever the input and the output port are different, a structure parameter of the tilt mirror is calculated based on the optical offset and the optimal angle. The optical offset and the structure parameter are stored in a memory as a test result.

Abstract: In an optical receiver, a light receiving element receives the optical packet signals and converts the optical packet signals to electrical signals. A bias voltage supply section supplies bias voltage to the light receiving element. A monitoring section monitors an input level of each optical packet signal or each electrical signal and transmits a monitored value to the bias voltage supply section. In addition, the bias voltage supply section temporarily increases the bias voltage according to magnitude of the monitored value after an end of receiving of each optical packet signal.

Abstract: A communication terminal apparatus receives a management signal at a bit rate A and a data signal at a bit rate B (B=A×M) through the same line. The communication terminal apparatus includes a signal regenerating unit, a management signal converting unit, a timing control unit, and a data signal obtaining unit. The signal regenerating unit regenerates a signal transmitted through the line as a signal of a bit rate C (C=A×N). The management signal converting unit converts N bits of the regenerated signal into the management signal of one bit. The timing control unit controls timing for obtaining a data signal based on the management signal. The data signal obtaining unit obtains the data signal according to timing control of the timing control unit.

Abstract: An optical device includes an I/O port group and a movable mirror reflecting light input through an input port of the I/O group, aligning the light reflected with an output port of the I/O port group, and changing the angle of the light reflected according to a driving voltage supplied thereto. The optical device further includes a control unit that adjusts the driving voltage within a range lower than the voltage at which the degree of alignment of the light with respect to the output port is maximized and controls attenuation of the light reflected by the moveable mirror.

Abstract: An optical switch includes plural ports aligned; a spectroscopic element that divides a light input to one of the ports that is an input port; plural mirrors that are aligned in a spectral direction of the light divided, and reflect the light divided; and a control unit that changes an angle of each of the mirrors so that the light reflected is output to one of the ports that is an output port, and shifts the angle in the spectral direction and a direction perpendicular to the spectral direction to attenuate the light output from the output port.