Abstract: A semiconductor laser element comprising a first stripe and a second stripe which are formed at a distance, and emits a first laser beams and a second laser beams from end surfaces of the first stripe and the second stripe; a first lens to separate the distance between the first laser beams and the second laser beams emitted from the semiconductor laser element; a half-wave plate which rotates the plane of polarization of the first laser beams by 90 degrees; a polarization beam combiner which multiplexes the first laser beams and the second laser beams which are entered, and emits both the laser beams; and an optical fiber which receives the laser beams emitted from the polarization beam combiner, and sends them to the outside are included.

Abstract: A laser diode module is provided which is capable of suppressing reduction in the efficiency of laser beam coupling with an optical fiber even in the case where a warp is caused in the mounting surface of a thermo electrical cooler on which a laser diode chip is mounted. A laser diode module has a heat sink and optical coupling portion mounted directly or indirectly on a mounting surface of a thermo electrical cooler. A laser diode chip and the optical coupling portion are located on the same side of the mounting surface along the emitting direction of a laser beam emitted from the laser diode chip, with respect to a first center line (Lcpp) intersecting perpendicularly with a tangential plane tangent to the mounting surface of the thermo electrical cooler at the center thereof and/or a second center line passing through the center of the mounting surface of the thermo electrical cooler and perpendicular to both the first center line and an axis representative of the emitting direction of the laser beam.

Abstract: The invention relates to an optical device, having high reliability, which is free from any breakage of optical fibers in line with changes in temperature. A laser diode element 1 is disposed in a metal-made package 9, the tip end side of a lensed fiber 2 having a lens 3 formed at the tip end side of the optical fiber is inserted into and fixed at the first ferrule 5, and the first ferrule 5 is fixed on the base 10. The second ferrule 6 is provided at the rear end side of the first ferrule 5 via a spacing, and is inserted into and fixed in the insertion portion 20 of the package 9. And, an intermediate portion of the lensed fiber 2 is inserted into and fixed at the second ferrule 6. A deflection 14 is provided at the lensed fiber 2 between the first ferrule 5 and the second ferrule 6, shown in FIG. 1A, at a temperature lower than the upper limit of the environmental temperature for use.

Abstract: A laser beam synthesizing member of a semiconductor laser module used as an optical amplifier that has a prism configured to correct respective optical paths of a plurality of laser beams, a beam synthesizing member configured to synthesize the plurality of laser beams once passed from the prism, and a holder member configured to integrally hold the prism and the beam synthesizing member, and where the beam synthesizing member has a first input part on which a first laser beam is incident, at least one other input part on which an other laser beam is incident, and an output part from which the first laser beam emerging from the first input part and the other laser beam emerging from the at least one other input part are multiplexed and emitted as a multiplexed laser beam.

Abstract: An antenna controller comprises an antenna beam control unit for controlling the direction of an antenna beam of an antenna, an inertial navigation system for acquiring motion information on a motion of the mobile body, an antenna beam direction calculation unit for calculating the direction of the antenna beam based on the motion information from the inertial navigation system to direct the antenna beam toward the geostationary satellite, a motion information acquisition unit for separately acquiring motion information on the motion of the mobile body, and a motion estimation unit for estimating a delay of the motion information acquired by the inertial navigation system based on the motion information acquired by the inertial navigation system and the motion information acquired by the motion information acquisition unit, and for estimating motion information to be sent to the antenna beam direction calculation unit in consideration of the estimated delay.

Abstract: A single semiconductor laser device used in a semiconductor laser module of an optical amplifier and having a first light emitting stripe with a diffraction grating and at least one other light emitting stripe with a diffraction grating and which are aligned to respectively emit a first laser beam and at least one other laser beam through one edge surface.

Abstract: A semiconductor laser module includes a single semiconductor laser device having a first light emitting stripe and at least one other light emitting stripe which are aligned to respectively emit a first laser beam and at least one other laser beam through one edge surface. It also includes a first lens positioned so that the first laser beam and the at least one other laser beam emitted from the semiconductor laser device are incident thereon, the first lens configured to separate the first laser beam and the at least one other laser beam. A beam synthesizing member is included and has a first input part on which the first laser beam is incident, at least one other input part on which the at least one other laser beam is incident, and an output part from which the first laser beam emerging from the first input part and the at least one other laser beam emerging from the at least one other input part are multiplexed and emitted as a multiplexed laser beam.

Abstract: A semiconductive laser module according to the present invention is configured with a semiconductive laser module having a semiconductive laser device, a cavity formed with at least one light feedback means included, and an optical fiber located at a front side of the cavity, wherein an optical filter for transmitting light of wavelength within a predetermined range is disposed in the cavity. The above-noted semiconductive laser module additionally has a combination of a collimator and a focusing lens for coupling emitted light from the semiconductive laser device with the optical fiber, and the optical filter is disposed between the collimator and the focusing lens. The optical filter has a dielectric multi-layered filter for transmitting a desired wavelength.

Abstract: A laser diode module of the invention can release heat radiated from a laser diode efficiently, and is of small size and small power consumption. An outer surface (15) of a bottom plate (2) of a package (7) is formed to be a board mounting surface to be mounted on a printed board (20). A base (6) is fixed to the inner wall surface (9) side of the top plate (8) of the package (7) and a laser diode (3) is fixed to the base (6). In the invention, an exemplary configuration where heat radiated from the laser diode is released effectively is formed by disposing a heat radiating unit (4) on the outer surface (16) side of the top plate (8) of the package (7), for example. The heat radiating unit (4) is formed by disposing a plurality of heat radiating fins (5) arranged at intervals, for example. The configuration containing the heat radiating unit (4) releases heat radiated from the laser diode (3) through the base (6), the top plate (8) and the heat radiating unit (4).

Abstract: An optical amplifier of the present invention comprises a pumping light source configured to output a pumping light, an amplifier unit configured to receive the pumping light from said pumping light source and amplify an optical signal that passes therethrough, and an optical fiber disposed between said pumping light source and said amplifier unit, said optical fiber including an optical filter that is configured to attenuate the optical signal from said amplifier unit.

Abstract: A semiconductor laser module 1 comprising a semiconductor laser device 2 having an emitting surface 2a from which excited light is emitted and a reflecting surface 2b opposite to the emitting surface, and an optical feedback medium 3 for feeding most of optical power emitted from the emitting surface 2a of the semiconductor laser device 2 back to the semiconductor laser device 2 by coupling means 4 and emitting part of the optical power. The semiconductor laser device 2 has a low reflectance multilayer coating 2c formed on the emitting surface 2a and having a reflectance of 10−4 to 10%. The low reflectance multilayer coating 2c has a reflection spectrum in the form of a curve having a maximum value at the central wavelength of reflection and minimum values on both sides of the central wavelength of reflection.

Abstract: A laser diode (LD) device 3 is mounted and fixed on a device mounting stand 2. A lens 5 on a tip side of a lensed fiber 8 fixed on a ferrule 4 and the LD device 3 are opposingly arranged. Centers of the lensed fiber 8 and the LD device 3 are aligned, in which state, the ferrule 4 is held and fixed from both sides of the ferrule 4 by a ferrule fixing components 6 and 7 on a side close to the LD device 3 and a side distant from the LD device 3, respectively. A hold-fixing part 11 of the ferrule 4 on the side distant from the LD device 3 is fixed to the ferrule fixing component 7 using a solder material 10. An inexpensive laser diode module with high long-term reliability can be provided which can be manufactured easily in a short time.

Abstract: A semiconductor laser module of an external-cavity type in which a GaAs/AlGaAs-based semiconductor laser having ripples in the gain-wavelength characteristic thereof and an optical transmission medium including a Bragg grating are optically coupled by an optical coupling member.

Abstract: The present invention discloses an optical fiber capable of providing optical connection to a semiconductor laser diode (LD) as a light emitting element at high optical coupling efficiency. An optical fiber (5) for optical coupling efficiency improvement is-coupled, by a fusion joint technique, to an end portion of an optical fiber (2) which is optically connected to a semiconductor LD (3). The optical fiber (5) for optical coupling efficiency improvement has a circular mode field w and the semiconductor LD (3) has an elliptical mode field, wherein the diameter W1 of the fiber (5) is nearly identical to that of the latter field of the semiconductor LD (3) extending in the ellipse's major axis direction. Further, an end portion of the optical fiber 5 for optical coupling efficiency improvement on the side of the semiconductor LD (3) is formed into an approximately wedge-like shape and its endmost portion is formed into a lens.

Abstract: There is provided a lensed optical fiber (20) in which a lens is formed on the end face of an optical fiber to enhance the efficiency of optical coupling with a light beam. The tip end portion of an optical fiber (21) is formed with a lens (26) formed into a wedge shape having two slant portions (24) symmetrical with respect to an axis (Ac) of a core (22) and a plane portion (25) perpendicular to the axis of the core.

Abstract: A laser diode module is provided which is capable of suppressing reduction in the efficiency of laser beam coupling with an optical fiber even in the case where a warp is caused in the mounting surface of a thermo electrical cooler on which a laser diode chip is mounted. A laser diode module has a heat sink and optical coupling portion mounted directly or indirectly on a mounting surface of a thermo electrical cooler. A laser diode chip and the optical coupling portion are located on the same side of the mounting surface along the emitting direction of a laser beam emitted from the laser diode chip, with respect to a first center line (Lcpp) intersecting perpendicularly with a tangential plane tangent to the mounting surface of the thermo electrical cooler at the center thereof and/or a second center line passing through the center of the mounting surface of the thermo electrical cooler and perpendicular to both the first center line and an axis representative of the emitting direction of the laser beam.

Abstract: There is provided a lensed optical fiber (20) in which a lens is formed on the end face of an optical fiber to enhance the efficiency of optical coupling with a light beam. The tip end portion of an optical fiber (21) is formed with a lens (26) formed into a wedge shape having two slant portions (24) symmetrical with respect to an axis (Ac) of a core (22) and a plane portion (25) perpendicular to the axis of the core.

Abstract: There is provided a lensed optical fiber (20) in which a lens is formed on the end face of an optical fiber to enhance the efficiency of optical coupling with a light beam. The tip end portion of an optical fiber (21) is formed with a lens (26) formed into a wedge shape having two slant portions (24) symmetrical with respect to an axis (Ac) of a core (22) and a plane portion (25) perpendicular to the axis of the core.

Abstract: A laser diode module is provided which is capable of suppressing reduction in the efficiency of laser beam coupling with an optical fiber even in the case where a warp is caused in the mounting surface of a thermo electrical cooler on which a laser diode chip is mounted. A laser diode module has a heat sink and optical coupling portion mounted directly or indirectly on a mounting surface of a thermo electrical cooler. A laser diode chip and the optical coupling portion are located on the same side of the mounting surface along the emitting direction of a laser beam emitted from the laser diode chip, with respect to a first center line (Lcpp) intersecting perpendicularly with a tangential plane tangent to the mounting surface of the thermo electrical cooler at the center thereof and/or a second center line passing through the center of the mounting surface of the thermo electrical cooler and perpendicular to both the first center line and an axis representative of the emitting direction of the laser beam.

Abstract: An elastic member made of, for instance, a rubber material, is fixed to a piston member of a lockup clutch. A wet friction facing is fixed to the elastic member. The elastic member provides a cushioning effect when the lockup clutch is engaged for controlled slippage.