Abstract: The top high refractive index layer of the top DBR mirror has a central region and a peripheral region. The central region has a protrusion that projects relative to the peripheral region in a direction in which the laser light is emitted. The VCSEL satisfies relationships below: dp×n=(1/4+N/2)×?, and dc×n=dp×n+(1/4+M/2)×? where ? is a wavelength of the laser light in vacuum; dc is a film thickness of the top high refractive index layer in the central region; dp is a film thickness of the top high refractive index layer in the peripheral region; n is a refractive index of the top high refractive index layer; and N and M are zero or a natural number.

Abstract: The protective film that covers the top distributed Bragg reflecting mirror has a central region and a peripheral region. The central region has a protrusion that projects relative to the peripheral region in a direction in which the laser light is emitted. The VCSEL satisfies relations below: dp×n=(N/2)×?, and dc×n=dp×n+(1/4+M/2)×?, where ? is a wavelength of the laser light in vacuum; dc is a film thickness of the protective film in the central region; dp is a film thickness of the protective film in the peripheral region; n is a refractive index of the protective film (wherein a refractive index of air<the refractive index n of the protective film<a refractive index of the top distributed Bragg reflecting mirror); and N is a natural number. M is zero or a natural number.

Abstract: An optical transmission module includes a light source element for emitting a predetermined light signal transmitted through an optical fiber, the light source element having lower characteristics in a low-temperature state than those in a high-temperature state, a driver circuit for driving the light source element, and a heat transfer member connected to each of the light source element and the driver circuit to transfer heat between the light source element and the driver circuit. The optical transmission module with such configuration can stably operate in a wide temperature range while achieving power saving and cost reduction.

Abstract: The protective film that covers the top distributed Bragg reflecting mirror has a central region and a peripheral region. The central region has a protrusion that projects relative to the peripheral region in a direction in which the laser light is emitted. The VCSEL satisfies relations below: dp×n=(N/2)×?, and dc×n=dp×n+(1/4+M/2)×?, where ? is a wavelength of the laser light in vacuum; dc is a film thickness of the protective film in the central region; dp is a film thickness of the protective film in the peripheral region; n is a refractive index of the protective film (wherein a refractive index of air<the refractive index n of the protective film<a refractive index of the top distributed Bragg reflecting mirror); and N is a natural number.

Abstract: There are provided an optical module including a semiconductor laser including a P-side electrode and an N-side electrode, and a semiconductor laser driver circuit that drives the semiconductor laser so as to output an optical signal from the semiconductor laser according to a pattern of a differentially transmitted digital electric signal, and the semiconductor laser driver circuit includes a positive-side terminal and a negative-side terminal for differentially transmitted non-inverted data, and a positive-side terminal and a negative-side terminal for differentially transmitted inverted data, and one terminal for the non-inverted data is electrically connected to one electrode of the semiconductor laser, and the other terminal for the non-inverted data, one terminal for the inverted data and the other terminal for the inverted data each are connected to the other electrode of the semiconductor laser.

Abstract: A circuit board provided with a control circuit and an optical module placed at a close distance and configured to be capable of effectively cooling the control circuit and the optical module is provided. A circuit board placed inside the housing of electronic equipment and provided with an optical module and a control circuit, which are mutually connected, has: a fan-assisted heat sink mounted on the control circuit and configured to ventilate the control circuit and cool the control circuit; and a fresh air feeding duct placed on the circuit board and configured to distribute fresh air taken in from outside the housing through the intake of the fan-assisted heat sink. The optical module is placed in a predetermined position along a site in which the fresh air feeding duct is formed.

Abstract: There are provided an optical module including a semiconductor laser including a P-side electrode and an N-side electrode, and a semiconductor laser driver circuit that drives the semiconductor laser so as to output an optical signal from the semiconductor laser according to a pattern of a differentially transmitted digital electric signal, and the semiconductor laser driver circuit includes a positive-side terminal and a negative-side terminal for differentially transmitted non-inverted data, and a positive-side terminal and a negative-side terminal for differentially transmitted inverted data, and one terminal for the non-inverted data is electrically connected to one electrode of the semiconductor laser, and the other terminal for the non-inverted data, one terminal for the inverted data and the other terminal for the inverted data each are connected to the other electrode of the semiconductor laser.

Abstract: There is provided an optical waveguide device including a light-emitting element having a light-emitting part for emitting a laser beam and a light-receiving element having a light-receiving part for receiving a laser beam, the elements being arranged on a mounting substrate in parallel with each other; and a first lens for optically coupling the laser beam emitted from the light-emitting part to a first optical waveguide core and a second lens for optically coupling the laser beam conducted through a second optical waveguide core to the light-receiving part, the lenses being arranged in parallel with each other, and in the optical waveguide device. The light-emitting element is a surface light-emitting semiconductor laser having a transparent semiconductor substrate laminated with an active layer as the light-emitting part, the surface light-emitting semiconductor laser emitting the laser beam from the active layer through the transparent semiconductor substrate.

Abstract: An optical transceiver which converts a plurality of optical signals input from a first side into electrical signals so as to output the electrical signals to a second side and converts a plurality of electrical signals input from the second side into optical signals so as to output the optical signals to the first side.

Abstract: An optical transmission module includes a light source element for emitting a predetermined light signal transmitted through an optical fiber, the light source element having lower characteristics in a low-temperature state than those in a high-temperature state, a driver circuit for driving the light source element, and a heat transfer member connected to each of the light source element and the driver circuit to transfer heat between the light source element and the driver circuit. The optical transmission module with such configuration can stably operate in a wide temperature range while achieving power saving and cost reduction.

Abstract: A vertical cavity surface emitting laser capable of high-speed modulation and stabilized control of polarization direction of the laser light is provided, including a resonator which is formed by stacking a semiconductor substrate, a lower mirror layer formed on the upper side of the semiconductor substrate, an active layer formed on the upper side of the lower mirror layer, and an upper mirror layer including an oxidized layer formed on the upper side of the active layer, and a portion of which is formed in a mesa shape from a predetermined position to the upper surface in a height direction; an insulation layer covering the side surface of the mesa-shaped portion of the resonator, and the upper surface of the non-mesa-shaped portion of the resonator; and electrodes being wired on the upper surface of the upper mirror layer and on the lower surface of the semiconductor substrate, respectively.

Abstract: A circuit board provided with a control circuit and an optical module placed at a close distance and configured to be capable of effectively cooling the control circuit and the optical module is provided. A circuit board placed inside the housing of electronic equipment and provided with an optical module and a control circuit, which are mutually connected, has: a fan-assisted heat sink mounted on the control circuit and configured to ventilate the control circuit and cool the control circuit; and a fresh air feeding duct placed on the circuit board and configured to distribute fresh air taken in from outside the housing through the intake of the fan-assisted heat sink. The optical module is placed in a predetermined position along a site in which the fresh air feeding duct is formed.

Abstract: An optical transceiver which converts a plurality of optical signals input from a first side into electrical signals so as to output the electrical signals to a second side and converts a plurality of electrical signals input from the second side into optical signals so as to output the optical signals to the first side.

Abstract: An optical module includes a fiber array, a laser diode array, a photodiode array and a micro-lens array. The fiber array includes optical fibers which are divided to a transmitter group and a receiver group. The laser diode array includes laser diodes which are grouped in a transmitter group. The photodiode array includes photodiodes which are divided to a monitor group and a receiver group. The laser diode array is provided between the fiber array and the photodiode array. The optical fibers of the transmitter group are optically aligned with the laser diodes of the transmitter group, respectively. The micro-lens array is provided between the laser diode array and the photodiode array, and optically aligns the laser diodes of the transmitter group and the optical fibers of the receiver group with the photodiodes of the monitor group and the photodiodes of the receiver group, respectively.

Abstract: An optical module includes a fiber array, a laser diode array and a photodiode array. The fiber array has optical fibers which are divided to a transmitter group and a receiver group. The laser diode array has laser diodes which are grouped in a transmitter group. The photodiode array has photodiodes which are divided to a monitor group and a receiver group. The laser diode array is provided between the fiber array and the photodiode array. Each optical fiber of the transmitter group, each laser diode of the transmitter group and each photodiode of the monitor group are optically aligned, respectively. Each optical fiber of the receiver group is optically aligned with each photodiode of the receiver group, respectively.

Abstract: An electrical connector includes an entry slot, first and second transmitter electrical pins, and first and second receiver electrical pins. The first and second transmitter electrical pins and the first and second receiver electrical pins are provided on the entry slot. The entry slot accepts a multi form-factor pluggable transceiver which has first and second optical transmitter channels and first and second optical receiver channels. The first transmitter electrical pins are electrically connected to first transmitter electrical pads of the first optical transmitter channel. The second transmitter electrical pins are electrically connected to second transmitter electrical pads of the second optical transmitter channel. The first receiver electrical pins are electrically connected to first receiver electrical pads of the first optical receiver channel. The second receiver electrical pins are electrically connected to second receiver electrical pads of the second optical receiver channel.

Abstract: An optical module includes a fiber array, a laser diode array, a photodiode array and a micro-lens array. The fiber array includes optical fibers which are divided to a transmitter group and a receiver group. The laser diode array includes laser diodes which are grouped in a transmitter group. The photodiode array includes photodiodes which are divided to a monitor group and a receiver group. The laser diode array is provided between the fiber array and the photodiode array. The optical fibers of the transmitter group are optically aligned with the laser diodes of the transmitter group, respectively. The micro-lens array is provided between the laser diode array and the photodiode array, and optically aligns the laser diodes of the transmitter group and the optical fibers of the receiver group with the photodiodes of the monitor group and the photodiodes of the receiver group, respectively.

Abstract: An optical module includes a fiber array, a laser diode array, a photodiode array and a micro-lens array. The fiber array includes optical fibers which are divided to a transmitter group and a receiver group. The laser diode array includes laser diodes which are grouped in a transmitter group. The photodiode array includes photodiodes which are divided to a monitor group and a receiver group. The laser diode array is provided between the fiber array and the photodiode array. The optical fibers of the transmitter group are optically aligned with the laser diodes of the transmitter group, respectively. The micro-lens array is provided between the laser diode array and the photodiode array, and optically aligns the laser diodes of the transmitter group and the optical fibers of the receiver group with the photodiodes of the monitor group and the photodiodes of the receiver group, respectively.

Abstract: An optical module includes a fiber array, a laser diode array and a photodiode array. The fiber array has optical fibers which are divided to a transmitter group and a receiver group. The laser diode array has laser diodes which are grouped in a transmitter group. The photodiode array has photodiodes which are divided to a monitor group and a receiver group. The laser diode array is provided between the fiber array and the photodiode array. Each optical fiber of the transmitter group, each laser diode of the transmitter group and each photodiode of the monitor group are optically aligned, respectively. Each optical fiber of the receiver group is optically aligned with each photodiode of the receiver group, respectively.

Abstract: An optical module includes a fiber array, a laser diode array and a photodiode array. The fiber array has optical fibers which are divided to a transmitter group and a receiver group. The laser diode array has laser diodes which are grouped in a transmitter group. The photodiode array has photodiodes which are divided to a monitor group and a receiver group. The laser diode array is provided between the fiber array and the photodiode array. Each optical fiber of the transmitter group, each laser diode of the transmitter group and each photodiode of the monitor group are optically aligned, respectively. Each optical fiber of the receiver group is optically aligned with each photodiode of the receiver group, respectively.