Abstract: The present technology relates to a distance measuring device and a distance measuring method that inhibit possible noise in a pixel signal based on reflected light from an object to allow accuracy of distance measurement to be maintained. A distance measuring device according to an aspect of the present technology includes a light emitting section emitting irradiation light, a light receiving section receiving reflected light corresponding to the irradiation light reflected at an object, a calculation section calculating a distance to the object on the basis of a time from emission of the irradiation light until reception of the reflected light, and a control section controlling emission of the irradiation light. The light receiving section includes a plurality of AD converting section AD-converting pixel signals read from the pixels.

Abstract: The present technology relates to a distance measuring device and a distance measuring method that inhibit possible noise in a pixel signal based on reflected light from an object to allow accuracy of distance measurement to be maintained. A distance measuring device according to an aspect of the present technology includes a light emitting section emitting irradiation light, a light receiving section receiving reflected light corresponding to the irradiation light reflected at an object, a calculation section calculating a distance to the object on the basis of a time from emission of the irradiation light until reception of the reflected light, and a control section controlling emission of the irradiation light. The light receiving section includes a plurality of AD converting section AD-converting pixel signals read from the pixels.

Abstract: A flyback boost circuit includes an output voltage detection terminal provided to a secondary winding of a transformer of the flyback boost circuit, and configured to detect an output voltage. Prior to the start of a boost operation, current is supplied to a secondary side of the transformer via the output voltage detection terminal to detect a voltage generated at the output voltage detection terminal, to thereby detect an unwired state by determining whether or not there is floating of the output voltage detection terminal or a grounding terminal of the secondary winding of the transformer.

Abstract: A clock recovery apparatus for generating a recovery clock from received data may include, but is not limited to, first and second oscillators. The first oscillator generates a first signal having a first frequency. The first signal synchronizes with the received data when the received data has a first level. The second oscillator is connected in series to the first oscillator. The second oscillator generates a second signal as the recovery clock when the first signal has a second level. The second signal has a second frequency. The second signal synchronizes with the first signal.

Abstract: An optical packet network system of a ring type, capable of preventing degradation of an optical signal, can be implemented by providing a mechanism relatively simple in structure, capable of erasing light noise if the optical packet signal does not exists. In the optical packet network system made up by interconnecting respective nodes adjacent to each other, and connecting a sending source of an optical packet signal to a ring, a light noise removal function block is provided between the respective nodes adjacent to each other.

Abstract: An optical communication apparatus includes an erbium-doped optical fiber amplifier for amplifying a modulated optical signal, wherein a light which is not modulated is inputted to the erbium-doped optical fiber amplifier together with the optical signal.

Abstract: A clock reproducing apparatus includes a clock reproducing circuit having: a gated oscillator having an oscillating circuit of two routes; and a frequency control circuit for comparing a phase of an output of the gated oscillator with a phase of a reference clock, and supplying a phase control signal to the gated oscillator based on the comparison result so as to set a delay time, input data is input to a reset input terminal of the gated oscillator, and different route of the two routes of the oscillating circuit operates depending on a case where the input data is “H” and a case where the input data is “L”.

Abstract: A flyback boost circuit includes an output voltage detection terminal provided to a secondary winding of a transformer of the flyback boost circuit, and configured to detect an output voltage. Prior to the start of a boost operation, current is supplied to a secondary side of the transformer via the output voltage detection terminal to detect a voltage generated at the output voltage detection terminal, to thereby detect an unwired state by determining whether or not there is floating of the output voltage detection terminal or a grounding terminal of the secondary winding of the transformer.

Abstract: In a light modulating apparatus of an external modulating type which is used in an optical communication system, there are provided an LN modulator, a light branching circuit, a photoelectric converter, a bias control circuit, a driver for an LN modulator which serves to drive the LN modulator in response to an input electric signal, a capacitor for cutting off DC and low frequency components of the input electric signal, a low frequency component compensating circuit for compensating the DC and low frequency components of the input electric signal, and an adding circuit for adding an output of the bias control circuit and that of the low frequency component compensating circuit and generating a bias control signal of the LN modulator.

Abstract: A clock reproducing apparatus includes a clock reproducing circuit having: a gated oscillator having an oscillating circuit of two routes; and a frequency control circuit for comparing a phase of an output of the gated oscillator with a phase of a reference clock, and supplying a phase control signal to the gated oscillator based on the comparison result so as to set a delay time, input data is input to a reset input terminal of the gated oscillator, and different route of the two routes of the oscillating circuit operates depending on a case where the input data is “H” and a case where the input data is “L”.

Abstract: An optical waveform shaping device includes a first waveguide portion, formed on a substrate, for transmitting the optical signal and simultaneously absorbing a portion of the optical signal, which has a signal level equal to or smaller than a predetermined value, so as to shape the optical signal; and a second waveguide portion, formed on the substrate, for transmitting the optical signal, which was transmitted through the first waveguide portion, and simultaneously amplifying the optical signal. The first waveguide portion may be formed using a saturable absorber. A first electrode for supplying electric current to the first waveguide portion so that the first waveguide portion is provided with a function of absorbing the optical signal; and a second electrode for supplying electric current to the second waveguide portion so that the second waveguide portion is provided with a function of amplifying the optical signal may also be provided.

Abstract: Disclosed is a repeater including: a recognizing unit to recognize a destination address of an optical packet from the optical packet which includes the destination address assigned in unit of bit and a bit indicating whether or not a plurality of destination addresses are assigned; an optical splitting unit to split the optical packet into a plurality of optical packets; and selecting units to select transmission channels for the split optical packets on the basis of recognition results by the recognizing units, respectively.

Abstract: A variable light signal delay apparatus includes a first delay optical fiber, a second delay optical fiber having a length different from the first delay optical fiber, and an optical switch having two input ports, two output ports, and paths, through which a light signal propagates, provided between the first delay optical fiber and the second delay optical fiber, in which a light signal input from at least one of the input ports propagated through either the first delay optical fiber or the second delay optical fiber or through neither the first delay optical fiber nor the second delay optical fiber to be output from a desired first output port.

Abstract: An optical amplification apparatus includes an optical amplification medium which has an input end and an output end, and amplifies an optical signal by a predetermined amplification rate; a first light source for launching excited light which excites the optical amplification medium; an isolator connected to the output end of the optical amplification medium; and a second light source for launching idle light which has a predetermined wavelength and is launched into the optical amplification medium from a point between the optical amplification medium and the isolator. The optical amplification medium, the first light source, the isolator, and the second light source are contained in the package of the optical amplification apparatus. The apparatus may further include a set of an optical absorption member for absorbing the idle light and an circulator connected to the input end of the optical amplification medium, or an input-side isolator connected to the input end of the optical amplification medium.

Abstract: An optical logic device performs a logic operation on a plurality of input light signals. The optical logic device has a photoelectric conversion portion, in which photoreceivers for receiving input light signals are provided in parallel, that outputs an electric signal obtained by adding up outputs of the photoreceivers, and a comparator that compares a voltage level of the electric signal outputted from the photoelectric conversion portion with a predetermined voltage level.

Abstract: A light modulating apparatus which is to be used in a transmission system using wavelength division multiplexing has: a signal generating section for producing a transmission signal and the like; a first light modulating section for modulating light emitted from a light source, on the basis of the transmission signal; a variable phase shifter which changes a phase of a light quantity control signal; a second light modulating section for modulating a light signal emitted from the first light modulating section, on the basis of an output of the variable phase shifter; a branching section for branching a light signal emitted from the second light modulating section, into an output light signal and an electric signal; and an analysis controlling section for sampling the electric signal, controlling the variable phase shifter on the basis of sampled data, and adjusting a timing of the modulation in the second light modulating section.

Abstract: A clock recovery apparatus for generating a recovery clock from received data may include, but is not limited to, first and second oscillators. The first oscillator generates a first signal having a first frequency. The first signal synchronizes with the received data when the received data has a first level. The second oscillator is connected in series to the first oscillator. The second oscillator generates a second signal as the recovery clock when the first signal has a second level. The second signal has a second frequency. The second signal synchronizes with the first signal.

Abstract: An optical switch changes over transmission paths of an optical signal by a refractive index change. The optical switch has an optical waveguide layer having an optical waveguide whose output path of an optical signal branches into two, and reflection diffusing ditches which are provided in a portion outside the optical waveguide in the optical waveguide layer, wherein the portion is closed to a branch portion of the optical waveguides. The reflection diffusing ditches extend in a direction crossing a traveling direction of the optical signal.

Abstract: To oscillate and output multiphased triangular waves with a designed waveform shape, wave crest value, and phase relationship. This multiphased triangular wave oscillating circuit has two triangular wave generating circuits 10A and 10B for generating two phased triangular waves A and B with phases opposite each other, a middle point potential fixing element 20 that always fixes the middle point potential of the output voltage A and B of the two triangular wave generating circuits 10A and 10B at a fixed value, and a mode switching element 30 that instantly switches the output voltage generation mode (up-slope waveform mode/down-slope waveform mode) in the two triangular wave generating circuits 10A and 10B at a preset reference wave crest value level.

Abstract: In a light modulating apparatus of an external modulating type which is used in an optical communication system, there are provided an LN modulator, a light branching circuit, a photoelectric converter, a bias control circuit, a driver for an LN modulator which serves to drive the LN modulator in response to an input electric signal, a capacitor for cutting off DC and low frequency components of the input electric signal, a low frequency component compensating circuit for compensating the DC and low frequency components of the input electric signal, and an adding circuit for adding an output of the bias control circuit and that of the low frequency component compensating circuit and generating a bias control signal of the LN modulator.