Abstract: It is an object to improve the visibility of a display screen on which a detected target is displayed. A detection device 1b is formed by a wave receiver disposed facing in a specific direction, and configured to periodically receive reflected waves corresponding to transmission wave transmitted from a wave transmitter, an echo train signal production component 8 configured to produce an echo train signal from each of the reflected waves, a distance from a starting point of the echo train signal corresponding to a distance from the wave transmitter, and an echo image signal production component 9 configured to produce an echo image signal based on each of the echo train signals in which each of the starting points is disposed at a specific reference point.

Abstract: Ocean floating installations (1) are disposed on the ocean. The ocean floating installations (1) float on the ocean with the lower part of the ocean floating installations (1) being fixed to the seabed by mooring ropes (11). Each of the ocean floating installations (1) is connected at a connection part (5a) to a cable (3), which is a first cable. Each of the cables (3) is connected at a connection part (5b) to a cable (7), which is a second cable. In other words, the ocean floating installations (1) are connected to each other by the cables (3) and the cable (7). A connection is established with the cables (7) at the connection parts (5b) located on the seabed. In other words, the cables (7) are installed on the seabed.

Abstract: A detecting device is provided. The detecting device detects target objects. The detecting device includes a transmitter configured to transmit transmission waves, a receiver configured to generate reception signals from reflection waves of the transmission waves, a target echo signal detecting module configured to detect target echo signals among the reception signals, a size calculating module configured to calculate a size of each the target objects based on the corresponding target echo signal, and a frequency index value distribution calculating module configured to calculate frequency index values for respective size ranges based on the calculated sizes, each frequency index value being an index of the number of the target objects. The frequency index value distribution calculating module has a first updating submodule configured to update the frequency index value for each size range every predetermined period of time.

Abstract: Ocean floating installations (1) are disposed on the ocean. The ocean floating installations (1) float on the ocean with the lower part of the ocean floating installations (1) being fixed to the seabed by mooring ropes (11). Each of the ocean floating installations (1) is connected at a connection part (5a) to a cable (3), which is a first cable. Each of the cables (3) is connected at a connection part (5b) to a cable (7), which is a second cable. In other words, the ocean floating installations (1) are connected to each other by the cables (3) and the cable (7). A connection is established with the cables (7) at the connection parts (5b) located on the seabed. In other words, the cables (7) are installed on the seabed.

Abstract: An ultrasonic wave transceiving device is provided. The device includes a transmitter for transmitting at least one kind of first detection data ultrasonic signal and a plurality of kinds of second detection data ultrasonic signals, a receiver for receiving echo signals of the first and second detection data ultrasonic signals, and first and second information generators for generating first and second information based on the echo signal of the first and second detection data ultrasonic signals, respectively. The transmitter transmits the first and second detection data ultrasonic signals which transmission period of the first detection data ultrasonic signal intervenes between transmission periods of the second detection data ultrasonic signals in time axis. The second information generator generates the second information by using the echo signals of the second detection data ultrasonic signals.

Abstract: This disclosure provides an underwater detection device, which includes a first generator for generating a first transmission signal, a second generator for generating a second transmission signal having a longer pulse width than that of the first transmission signal, an output unit for outputting the transmission signals generated by the first and second generators to a transducer for transmitting underwater ultrasonic waves based on the first and second transmission signals, respectively, receiving the reflection waves caused by the ultrasonic waves, respectively, and converting the reflection waves into a first reception signal and a second reception signal, respectively, an underwater detector for detecting at least one of a presence of a target object and a water bottom depth based on the first reception signal, and a bottom sediment discriminator for discriminating a water bottom sediment type based on the second reception signal.

Abstract: It is an object to improve the visibility of a display screen on which a detected target is displayed. A detection device 1b is formed by a wave receiver disposed facing in a specific direction, and configured to periodically receive reflected waves corresponding to transmission wave transmitted from a wave transmitter, an echo train signal production component 8 configured to produce an echo train signal from each of the reflected waves, a distance from a starting point of the echo train signal corresponding to a distance from the wave transmitter, and an echo image signal production component 9 configured to produce an echo image signal based on each of the echo train signals in which each of the starting points is disposed at a specific reference point.

Abstract: A detecting device is provided. The detecting device detects target objects. The detecting device includes a transmitter configured to transmit transmission waves, a receiver configured to generate reception signals from reflection waves of the transmission waves, a target echo signal detecting module configured to detect target echo signals among the reception signals, a size calculating module configured to calculate a size of each the target objects based on the corresponding target echo signal, and a frequency index value distribution calculating module configured to calculate frequency index values for respective size ranges based on the calculated sizes, each frequency index value being an index of the number of the target objects. The frequency index value distribution calculating module has a first updating submodule configured to update the frequency index value for each size range every predetermined period of time.

Abstract: An ultrasonic wave transceiving device is provided. The device includes a transmitter for transmitting at least one kind of first detection data ultrasonic signal and a plurality of kinds of second detection data ultrasonic signals, a receiver for receiving echo signals of the first and second detection data ultrasonic signals, and first and second information generators for generating first and second information based on the echo signal of the first and second detection data ultrasonic signals, respectively. The transmitter transmits the first and second detection data ultrasonic signals which transmission period of the first detection data ultrasonic signal intervenes between transmission periods of the second detection data ultrasonic signals in time axis. The second information generator generates the second information by using the echo signals of the second detection data ultrasonic signals.

Abstract: This disclosure provides an underwater detection device, which includes a first generator for generating a first transmission signal, a second generator for generating a second transmission signal having a longer pulse width than that of the first transmission signal, an output unit for outputting the transmission signals generated by the first and second generators to a transducer for transmitting underwater ultrasonic waves based on the first and second transmission signals, respectively, receiving the reflection waves caused by the ultrasonic waves, respectively, and converting the reflection waves into a first reception signal and a second reception signal, respectively, an underwater detector for detecting at least one of a presence of a target object and a water bottom depth based on the first reception signal, and a bottom sediment discriminator for discriminating a water bottom sediment type based on the second reception signal.

Abstract: A device and method for determining bottom sediment is provided. The method includes transmitting a pulse of a pulse width corresponding to a water-bottom depth, extracting a series of amplitude data of water-bottom echo signals from predetermined signals among the water-bottom echo signals received by the transducer at a predetermined time interval, normalizing the extracted series of amplitude data after TVG-processed, calculating two or more feature quantities based on the normalized series of amplitude data in each of segments of the normalized series of amplitude data, and a value corresponding to the water-bottom depth, and generating bottom-sediment classification information indicating the bottom sediment based on the two or more feature quantities.

Abstract: A device and method for determining bottom sediment is provided. The method includes transmitting a pulse of a pulse width corresponding to a water-bottom depth, extracting a series of amplitude data of water-bottom echo signals from predetermined signals among the water-bottom echo signals received by the transducer at a predetermined time interval, normalizing the extracted series of amplitude data after TVG-processed, calculating two or more feature quantities based on the normalized series of amplitude data in each of segments of the normalized series of amplitude data, and a value corresponding to the water-bottom depth, and generating bottom-sediment classification information indicating the bottom sediment based on the two or more feature quantities.

Abstract: The invention provides a multi-frequency transducer capable of obtaining desired directivity regardless of frequencies. Parallelepiped-shaped transducer elements (1) are used as transducer elements and a plurality of such transducer elements (1) are arranged in an array. The transducer elements (1) are caused to resonate using a resonant frequency in fundamental vibration mode and a resonant frequency in harmonic vibration mode determined by the dimensions (A, B) of a short edge (1a) and a long edge (1b) perpendicular to a longitudinal edge (1c) of each transducer element (1) to transmit and receive at multiple frequencies. The angle of directivity (?) of the transducer elements is controlled by the dimension (C) of the longitudinal edge which is set to a value which does not affect resonance in either the fundamental vibration mode or the harmonic vibration mode.

Abstract: An EA-DFB module including a DFB laser diode and an EA modulator formed on an InP first-conductivity-type substrate has a mesa stripe, a current blocking structure formed on both side surfaces of the mesa strip and a second InP cladding layer formed on top of the mesa stripe and the current blocking structure. The current blocking structure includes a Fe-doped semi-insulating film, a first conductivity-type buried layer and a carrier-depleted layer. The carrier-depleted layer reduces the parasitic capacitance at the boundary between the first-conductivity-type buried layer and the second InP cladding layer.

Abstract: A monolithic semiconductor optical device with excellent temperature and modulation characteristics and associated method of manufacturing whereby the device has a semiconductor substrate, a semi-insulating buried heterostructure GaInAsP-based DFB laser; and either a buried ridge type AlGaInAs-based EA or a self aligned structure (SAS) AlGaInAs-based EA modulator.

Abstract: A semiconductor laser device according to the present invention comprises a laminated structure of a semiconductor material including an active layer formed of a quantum well structure, a low-reflection film formed on one end face of the structure, and a high-reflection film formed on the other end face of the structure. The cavity length (L) of the device is 1,200 &mgr;m or more. This laser device, which enjoys high kink currents and a satisfactorily linear current-optical output characteristic, is a useful pumping light source for optical fiber amplifier.

Abstract: A semiconductor laser device (30) includes a layered structure formed on an n-type GaAs substrate (32) having a bandgap energy Eg1 and including an n-type AlGaAs cladding layer (34), an active layer (36) including a quantum-well structure of two layers InGaAs/GaAs having a bandgap energy Eg2 which is smaller than Eg1, a p-type AlGaAs cladding layer (38), and a p-type GaAs cap layer (40), which are consecutively epitaxially grown. The cap layer and the upper portion of the p-type cladding layer are formed as a stripe-shaped mesa structure. An SiN passivation film (42) is formed on the areas except for the top of the cap layer. On the exposed cap layer and the passivation layer a p-side electrode (44) is formed. On the bottom surface of the substrate an n-side electrode (46) including layered metal films of In/AuGe/Ni/Au is formed. An absorption medium layer is interposed between the GaAs substrate and the n-side electrode.

Abstract: The invention provides a multi-frequency transducer capable of obtaining desired directivity regardless of frequencies. Parallelepiped-shaped transducer elements (1) are used as transducer elements and a plurality of such transducer elements (1) are arranged in an array. The transducer elements (1) are caused to resonate using a resonant frequency in fundamental vibration mode and a resonant frequency in harmonic vibration mode determined by the dimensions (A, B) of a short edge (1a) and a long edge (1b) perpendicular to a longitudinal edge (1c) of each transducer element (1) to transmit and receive at multiple frequencies. The angle of directivity (&thgr;) of the transducer elements is controlled by the dimension (C) of the longitudinal edge which is set to a value which does not affect resonance in either the fundamental vibration mode or the harmonic vibration mode.

Abstract: An EA-DFB module including a DFB laser diode and an EA modulator formed on an InP first-conductivity-type substrate has a mesa stripe, a current blocking structure formed on both side surfaces of the mesa strip and a second InP cladding layer formed on top of the mesa stripe and the current blocking structure. The current blocking structure includes a Fe-doped semi-insulating film, a first conductivity-type buried layer and a carrier-depleted layer. The carrier-depleted layer reduces the parasitic capacitance at the boundary between the first-conductivity-type buried layer and the second InP cladding layer.

Abstract: The present invention provides a semiconductor laser module. A semiconductor laser module (1A) comprising a semiconductor laser element (2a) and an optical fiber (3a) optically coupled by an optical coupling means (2b) is provided, wherein on the optical fiber (3a), a reflective portion (4) and a birefringence fiber (3a) are provided, the birefringence fiber (3a) is provided at least from the incident end on the side of the optical coupling means (2b) to immediately before the reflective portion (4), a connection portion (6) is provided at least at one point in the longitudinal direction of the birefringence fiber (3a), and in the connection portion (6), two eigen axes of X axes and Y axes are connected so that the eigen axes intersect each other at an established angle &thgr;.