High speed optical transmission assembly
Granted: May 2, 2006
Patent Number:
7039083
An optical assembly that can be utilized as a transmitter in a high data rate optical transceiver system is presented. The optical assembly allows a laser driver to be mounted near the laser and allows the laser driver and the laser to utilize a common heat sink. Further, assembly can be performed reliably and quickly to reduce the cost of production of the optical assembly.
Optical module
Granted: May 2, 2006
Patent Number:
7038866
The present invention provides a compact, highly reliable optical module in which a light-emitting element and optical modulator element that differ from each other in thermal expansion coefficient are mounted in one casing. In the optical module having a differential thermal expansion coefficient less than 5×10?6 [1/K] between the light-emitting element and the casing, and a differential thermal expansion coefficient of at least 5×10?6 [1/K] between the optical modulator element and…
Optical transmission module
Granted: April 25, 2006
Patent Number:
7035302
The present invention provides an optical transmission module having a laser diode that generates laser beams and a differential type current switch provided with a first switch and a second switch in order to supply a modulating current to the laser diode. A terminal of the laser diode and the first switch are connected in series through a first transmission line and a first capacitor, the other terminal of the laser diode and the second switch are connected in series through a second…
Structure of chip carrier for semiconductor optical device, optical module, and optical transmitter and receiver
Granted: April 18, 2006
Patent Number:
7030418
A chip carrier includes a metal-coated portion formed on a front surface of a substrate and to be mounted a device, and a rear surface of the substrate being coated with a metal, in which a metal-coated portion is formed on a side surface of the substrate and the metal-coated portion on the front surface of substrate is connected with the metal-coated portion on the rear surface by the metal-coated portion formed on the side surface of the substrate, thereby maintaining frequency…
Optical transmission device and optical transmission system using the same
Granted: April 18, 2006
Patent Number:
7031620
An optical transmission system includes a current source for outputting a drive current, a semiconductor laser for converting the drive current into a stimulated emission light and producing the same, a drive circuit for converting a transmission data signal into a modulation control signal and outputting the same, an optical modulator for receiving the stimulated emission light and a shading control signal for interrupting light emission and producing and outputting transmission signal…
Optical module and optical transmission apparatus
Granted: April 11, 2006
Patent Number:
7027674
The present invention provides an optical module, and an optical transmission line comprising the optical module. The optical module has a structure in which an optical-modulator-mounted carrier is formed of a semiconductor substrate; a transmission line on the carrier is formed of a coplanar waveguide; a transmission line for inputting a signal into the transmission line is formed on a dielectric substrate; the transmission line on the input side which is a grounded coplanar waveguide…
Optical coupling apparatus
Granted: March 14, 2006
Patent Number:
7011457
An optical coupling apparatus having a temperature control element on which a semiconductor light emitting element, a substrate and a lens are mounted, the semiconductor light emitting element being mounted on the substrate, and rays of light from the semiconductor light emitting element being introduced into the lens. A base on which the temperature control element is disposed, a through-hole portion formed in a housing wall portion installed on the base, penetrating through the housing…
Optical module
Granted: March 14, 2006
Patent Number:
7011458
An optical module having: a first transmission line and a second transmission line, both connected in series to transmit electrical signals; a laser diode element; an optical modulator element; a termination resistance element for impedance matching; a first bonding wire connecting one end of the first transmission line and the optical modulator element; and a second bonding wire connecting the optical modulator element and the termination resistance element. The resistance value of the…
Method for fabricating semiconductor laser element and the same laser element
Granted: January 31, 2006
Patent Number:
6991950
There is provided a semiconductor laser element which can change band gap wavelengths without change of composition of a multiple quantum well active layer and a method for fabricating a semiconductor laser module. In the method for fabricating a semiconductor laser element wherein a multiple quantum well active layer is formed on a semiconductor substrate with a crystal growth method, an insulation film is formed at the upper part of the multiple quantum well active layer, an electrode…
Laser diode and manufacturing method thereof
Granted: January 24, 2006
Patent Number:
6990133
Laser diodes containing aluminum at high concentration in an active layer have been usually suffered from remarkable facet deterioration along with laser driving operation and it has been difficult for the laser diodes to attain high reliability. An aluminum oxide film lacking in oxygen is formed adjacent to the semiconductor on an optical resonator facet, by which facet deterioration can be minimized and, accordingly, the laser diode can be operated with no facet deterioration at high…
Distributed feedback semiconductor laser equipment employing a grating
Granted: January 24, 2006
Patent Number:
6989550
The prior art distributed feedback laser having an InGaAlAs active layer involves a problem that its laser characteristics are deteriorated at high temperature due to the high device resistance. According to the present invention, a ridge type laser is fabricated by: forming an InGaAlAs-MQW layer 104 on a n-type InP substrate 101; growing a p-type InGaAlAs-GRIN-SCH layer 105, a p-type InAlAs electron stopping layer 106 and a p-type grating layer 107 in this order on the InGaAlAs-MQW…
Semiconductor laser diode and optical module
Granted: January 10, 2006
Patent Number:
6985505
The present invention provides a highly reliable ridge-waveguide semiconductor laser diode and an optical module. The p-side electrode of the ridge-waveguide laser diode has a first conductor layer region and a second conductor layer region formed on the first conductor layer region. At least one of facets of the second conductor layer region is recessed inward from a reflection facet. Thus, the ridge-waveguide semiconductor laser diode has a structure in which strain which is caused by…
Optical transmission module
Granted: January 10, 2006
Patent Number:
6985659
The present invention relates to an optical transmission module comprising two substrates, each of which has an electronic part mounted on the substrate and a terminal area for inputting/outputting an electric signal into/from the electronic part, wherein an electrical connection is made between the terminal areas of said two substrates by use of a flexible substrate having a structure constituted of at least three layers, and thereby a high frequency signal is transmitted between the…
Optical modules and methods of making the optical modules
Granted: December 27, 2005
Patent Number:
6979810
A sample & hold type phase detector is used in a CDR IC and, in jitter transfer bandwidth adjustment, VCO output waveforms 90° out of phase with each other can be inputted to the phase detector, whereby a jitter transfer bandwidth can be calculated by only the measurement of frequency and of a DC voltage and it is possible to make a jitter transfer bandwidth adjustment in DC test for IC.
Semiconductor laser module and optical transmitter
Granted: November 8, 2005
Patent Number:
6963593
For preventing an optical axis from shifting due to a heat cycle in a semiconductor laser module, or in a optical transmitter, the semiconductor laser module comprises, a semiconductor laser element, a frame for storing the semiconductor laser element therein, an optical fiber fixing portion being connected to the frame; and a flange being connected to the frame, and having a fixing portion for fixing the frame on a substrate, wherein the flange has a narrow width region between a fixing…
Film thickness measuring method of member to be processed using emission spectroscopy and processing method of the member using the measuring method
Granted: November 1, 2005
Patent Number:
6961131
A standard pattern of a differential value of an interference light is set with respect to a predetermined film thickness of a first member to be processed. The standard pattern uses a wavelength as a parameter. Then, an intensity of an interference light of a second member to be processed, composed just like the first member, is measured with respect to each of a plurality of wavelengths so as to obtain a real pattern of an differential value of the measured interference light…
Semiconductor laser module
Granted: November 1, 2005
Patent Number:
6961357
In a semiconductor laser module, in order to sufficiently reduce the thermal stress arising in a due to the bonding of elements when they are packaged and to improve the yield of production, the semiconductor laser module is provided with a semiconductor laser element, a submount bonded to the semiconductor laser element with a solder layer in-between and thereby mounted with it, and a base mounted with this submount with another solder layer in-between. Herein, T/W?0.15 holds, where W…
Optical module and method for manufacturing optical module
Granted: August 30, 2005
Patent Number:
6937406
The present invention provides an optical module and a method for manufacturing the optical module, in which a V-shaped or trapezoidal groove having a first slope and a second slope facing to the first slope is formed at the surface of a silicon substrate by anisotropic etching, an adhesive is applied to a portion of at least the second slope in a region except the first slope of the groove, and lens is fixedly put in the groove.
Optical transmitter modules
Granted: August 30, 2005
Patent Number:
6937628
A subject of the invention is to reduce the temperature dependence of an etalon as a wavelength locker for a semiconductor laser device and so forth. Concretely, it is to restrict the lowering of the wavelength locking performance of the etalon dependent on the temperature variation. A means to solve the subject is the use of an air gap etalon. Concretely, the means is provided with a media plate and parallel plane plates on both sides of the media plate. The two parallel plane plates…
Semiconductor laser device
Granted: August 30, 2005
Patent Number:
6937631
A semiconductor laser device which ensures high yield, high reliability and high power output by reduction in tensile strain in its active region for improvement in the COD level. The device comprises: a semiconductor crystal-growing portion having an active layer for conversion of electric energy into light energy and a mesa structure protruding on the one side; and an electrode film which is electrically connected with the top face of the mesa structure. The electrode film has a…
