Abstract:
An optical module includes: a flexible board having a first surface on which a component is mounted and a second surface opposite to the first surface; a bottom electrode part having a bottom surface on which a heat release electrode is provided, the bottom electrode part mounted on the first surface of the flexible board; and a heat release member configured to absorb heat from the bottom electrode part and release the heat to outside. The heat release member is arranged close to said second surface of the flexible board at a position where the bottom electrode part is mounted.
Abstract:
An optical module includes a substrate on which an optical waveguide is formed, and an optical fiber assembly. The optical fiber assembly includes an optical fiber, a translucent member, and a mirror portion. The translucent member includes a joint surface joined to an end surface of the substrate at an end of the optical waveguide, and is attached to a distal end of the optical fiber. The mirror portion is formed on the translucent member, reflects light emitted from the distal end of the optical fiber in a direction different from a traveling direction of the light, and collects the reflected light into the end of the optical waveguide through the joint surface.
Abstract:
An optical module includes a circuit substrate and a terminal. The circuit substrate includes a first pattern, a second pattern, a first cover material, and a second cover material. The first pattern electrically is connected to the terminal and formed in a predetermined shape on a first surface of the circuit substrate. The second pattern is formed in a predetermined shape at a position corresponding to the first pattern on a surface opposite to the first surface. The first cover material covers at least a portion of the first pattern to be bent along with bending of the circuit substrate. The second cover material covers at least an end of the second pattern.
Abstract:
An optical modulator includes: a ferroelectric substrate in which an input optical waveguide, first and second optical waveguides, and an output optical waveguide are formed; a first electrode formed in a vicinity of the first optical waveguide and to which a first DC voltage is applied; a second electrode formed in a vicinity of the second optical waveguide and to which a second DC voltage is applied; a third electrode electrically connected to the first electrode and formed on both sides of the second electrode; and a fourth electrode electrically connected to the second electrode and formed on both sides of the first electrode. A first gap between the first electrode and the fourth electrode is approximately the same as a second gap between the second electrode and the third electrode. A gap between the third electrode and the fourth electrode is 1-5 times greater than the first gap.
Abstract:
An optical transmitting apparatus includes: a substrate; optical modulators that are arranged in parallel to one another on the substrate and modulate light; waveguides that are formed on the substrate and guide signal light represented by at least one of modulated light beams obtained by the light being modulated by the plurality of optical modulators and monitor light represented by at least another one of the modulated light beams other than the signal light; lenses that collimate the signal light and the monitor light emitted from the waveguides; and a holding member that causes the signal light and the monitor light to be emitted from the lenses in mutually-different directions, by holding the lenses in such a manner that the optical axis of at least one of the lenses is out of alignment in a predetermined direction with the optical axis of at least one of the waveguides.
Abstract:
An optical module includes a substrate and terminals. The substrate has: a first planar part having first through holes into which the terminals are inserted respectively; a second planar part that opposes the first planar part as a result of the substrate being folded and has second through holes into which the terminals are inserted respectively; at least one first land part that is formed on the first planar part around at least one of the first through holes and that is connected to at least one of the terminals inserted through the first through hole; and at least one second land part that is formed on the second planar part around at least one of the second through holes into which another one of the terminals not being connected to the first land part is inserted and that is connected to the terminal inserted through the second through hole.
Abstract:
An optical transmitter includes: a wavelength tunable light source; an etalon filter that filters output light of the light source; a measurement unit that generates a monitor value corresponding to power of output light of the etalon filter; and a controller that controls a temperature of the light source and a temperature of the etalon filter. Until the wavelength of the output light of the light source is adjusted to a target wavelength, the controller alternately performs first processing to control the temperature of the light source based on the monitor value so as to shift the wavelength of the output light of the light source by a specified amount, and second processing to control the temperature of the etalon filter based on the monitor value so as to shift the transmission characteristics of the etalon filter by the specified amount.
Abstract:
An optical modulating apparatus includes driver that is mounted on a printed circuit board such that a signal electrode pad and a ground electrode pad of the driver are exposed in an opening of the printed circuit board. An optical modulating device is mounted on the printed circuit board, opposing the driver across the opening. A flexible circuit board is disposed in the opening. An end of a signal terminal of the flexible circuit board is electrically connected to a signal electrode of the optical modulating device. An end of a ground terminal of the flexible circuit board is electrically connected to a ground electrode of the optical modulating device. The other end of the signal terminal is soldered to the signal electrode pad of the driver, and the other end of the ground terminal is soldered to the ground electrode pad of the driver.
Abstract:
An optical communication apparatus includes an optical modulator having a Mach-Zehnder interferometer with a pair of waveguides and configured to modulate a phase of light emitted from a light source, a first controller configured to control a first substrate bias voltage or an amplitude of a first drive signal applied to a first waveguide of the waveguide pair of the optical modulator based upon an output of the optical modulator or a wavelength of the light source; and a second controller configured to control a second substrate bias voltage or an amplitude of a second drive signal applied to a second waveguide of the waveguide pair of the optical modulator independently from the first controller, based upon the output of the optical modulator or the wavelength of the light source.
Abstract:
An optical module includes: a driver; an optical modulator; a connector that is electrically connected to either the driver or the optical modulator and is provided with an input/output terminal; and a flexible substrate that has flexibility, is connected to the connector, and transfers an electrical signal generated by the driver to the optical modulator, wherein in an end part connected to the connector, the flexible substrate has, on a first surface facing the input/output terminal, a signal-purpose wiring pattern used for transferring the electrical signal and a ground-purpose wiring pattern formed along the signal-purpose wiring pattern, and has, on a second surface that is different from the first surface, a ground electrode that partially covers the second surface and has a shorter electrical distance to the signal-purpose wiring pattern than an electrical distance between the signal-purpose wiring pattern and the ground-purpose wiring pattern.