Optical transmission module
Granted: June 17, 2004
Application Number:
20040114883
The present invention provides an optical transmission module comprising: a laser diode; a lens for condensing a laser beam from the laser diode; a fiber ferrule which is placed so that the laser beam condensed by the lens can enter a fiber core; and a lens aperture or a lens aperture portion which is provided at one of the lens itself, a position before the lens and a position after the lens.
Optical transmission module
Granted: June 17, 2004
Application Number:
20040114650
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…
Semiconductor electro-absorption optical modulator integrated light emission element, light emission element module and optical transmission system
Granted: May 27, 2004
Application Number:
20040101316
For achieving a transmission light source having different transmission properties or characteristics, i.e., the &agr; parameters, depending upon application thereof, in a light emission element of semiconductor EA modulator integrated type being constructed with a light emission portion for lasing with a single vertical mode and a plurality of EA modulators, wherein an absorption edge wavelength under the condition of applying no bias thereto, in the semiconductor multiple-quantum-well…
Transmission line, optical module using the same and manufacturing method of optical module
Granted: April 15, 2004
Application Number:
20040070811
According to the present invention there are provided a transmission line and an optical module having the transmission line, the transmission line having on a dielectric substrate a first signal wiring conductor, a second signal wiring conductor insulated from the first signal wiring conductor, a first electrode disposed near the first and second signal wiring conductors, a second electrode disposed near the second signal wiring conductor, and a ground wiring conductor disposed in…
Semiconductor laser module and optical Transmitter
Granted: April 8, 2004
Application Number:
20040066814
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…
Optical receiver
Granted: April 1, 2004
Application Number:
20040062557
A variable optical attenuator VOA and a gain-clamped semiconductor optical amplifier GC-SOA are combined as an optical preamplifier. The variable optical attenuator is controlled so that a desired optical power is sent to the gain-clamped semiconductor optical amplifier or so that a desired optical power is sent to a photoelectric conversion stage. A optical power monitor is provided to compare a monitored value with a target value, and a variable optical attenuator control circuit…
Optical transmission module
Granted: March 4, 2004
Application Number:
20040042740
This optical transmission module wires and connects a coaxial can package in which high-speed signal transmission wiring whose characteristic impedance matches is formed on a ceramic PC board into which a coaxial can stem penetrates and a PC board on which a peripheral circuit is mounted using a flexible PC board in which the high-speed signal transmission wiring is formed in the same manner. The module makes, on the opposite side, an elastic conductive heat-conducting material is…
Optical transmission module
Granted: February 26, 2004
Application Number:
20040037516
There is provided a thin and small size connector-less optical transmission module M which assures excellent high frequency characteristic. This optical transmission module comprises transmission line substrates and a coaxial cable for connecting these transmission line substrates and is connected to the transmission line substrate via a contact sleeve which is provided with projections fixed to the external conductor of the coaxial cable and projected in the extending direction of the…
Method for manufacturing avalanche photodiodes, avalanche photodiode, optical receiver module and optical receiving apparatus
Granted: January 1, 2004
Application Number:
20040000675
With respect to an avalanche photodiode (APD) having a semi-insulating re-grown guard-ring layer, its photocurrent-vs.-reverse-bias-voltage characteristic at several temperature-points is measured. Moreover, based on the measured result, the optical responsivity is determined from a flat portion that will appear in the photocurrent-vs.-reverse-bias-voltage characteristic at a temperature that is higher than the several temperature-points.
Optical transmission equipment
Granted: December 11, 2003
Application Number:
20030228153
Optical transmission equipment with more than one power supply which can, when turning on the power supplies, set predetermined function of a signal processing circuit after a predetermined time period after the last turn-on of the power supply and can enable the operation of a drive circuit of the light emitting device after an additional predetermined time period.
Semiconductor photodetector device and manufacturing method thereof
Granted: November 27, 2003
Application Number:
20030218226
Reducing a dark current in a semiconductor photodetector provided with a second mesa including an regrown layer around a first mesa. An n-type buffer layer, a n-type multiplication layer, a p-type field control layer, a p-type absorption layer, a cap layer made of p-type InAlAs crystal, and a p-type contact layer 107 are made to grow on a main surface of a n-type substrate. Thereafter the p-type contact layer, the p-type cap layer, the p-type absorption layer and the p-type field control…
High-frequency transmission line and an optical module incorporating the same line
Granted: October 30, 2003
Application Number:
20030202800
A transmission line with a bending portion is provided, which line comprises any one of a coplanar line, another coplanar waveguide line formed on the dielectric substrate under which a ground layer is provided and a coplanar strip line. A chamfered portion is provided on the outer angular portion of the bending portion of the signal wiring conductor and a triangular conductor is disposed to an inner angular portion thereof. Given that length of the chamfered portion is defined as a, and…
Optical module equipped with a wiring plate
Granted: October 16, 2003
Application Number:
20030193095
In an optical module including an optical element and a semiconductor IC for driving it in a case, a metal stem 35 on which an optical element 10 is mounted is provided with a wiring plate 11, a semiconductor IC 30 for electrically driving the optical element 10, and the wiring plate 11 are connected with each other by wires 16, and further the wiring plate 11 and the optical element 10 are connected with each other by the wires 16. The optical communication module having excellent high…
Optical module with a monitor photo diode
Granted: October 9, 2003
Application Number:
20030189770
A PD (20) is mounted to a position offset (23) as viewed in the direction orthogonal to the center of an optical axis (14) of backward light (13) of an LD (11) in such a manner that a light receiving plane (21) thereof becomes substantially parallel to the center of the optical axis. Alternatively, the PD (20) is mounted thereto so that the light receiving plane of the PD is inclined at angles ranging from about 0° to about 30° to the center of the optical axis of the backward…
Mach-Zehnder optical modulator
Granted: September 4, 2003
Application Number:
20030165001
A Mach-Zehnder optical modulator that can attain a higher transmission speed than the driver signal speed but also attains, by setting multi-value amplitudes, an information transmission volume corresponding to an integer multiple of a single driver while allowing the transmission speed to remain as it is, wherein plural optical waveguide branches and plural Mach-Zehnder modulator portions are used, and by utilizing a propagation delay of a modulation signal for driving each of the…
Semiconductor laser diode and optical module
Granted: September 4, 2003
Application Number:
20030165169
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 and the production method of the same
Granted: August 14, 2003
Application Number:
20030152119
An optical transmission module with an optical device mounted in a substrate provided with an optical waveguide is provided wherein respective metallic electrodes in pair are symmetrically disposed in each side of an optical device divided by a centerline parallel to an optical axis such that those electrodes have an error of 60 &mgr;m or less and said metallic electrodes are soldered to a metallic electrode as disposed on a substrate, which electrode has a size enough to cover those…
Optical transmission device
Granted: May 15, 2003
Application Number:
20030091258
The provision of a coplanar waveguide coupled with a microstrip line with a transmission line substrate that is used between two functional units of different impedance characteristics allows the input and output impedance matching to be performed, the impedance matching between which coplanar waveguide and microstrip line is performed by the variation of the signal linewidth. It allows the transmission characteristics of the optical transmission device in high frequency band to improve.
Optical module testing method and testing system
Granted: May 1, 2003
Application Number:
20030081278
While modules to be tested in one constant temperature oven are tested by providing a plurality of constant temperature ovens, accommodating a plurality of modules to be tested in each constant temperature oven and connecting the modules to be tested accommodated in a plurality of constant temperature ovens to the measuring instruments via the switches, preparation for testing such as temperature change of the other constant temperature oven is conducted and the modules to be tested in…
Optical signal receiving module, optical signal receiver and optical fiber communication equipment
Granted: May 1, 2003
Application Number:
20030081297
On a chip carrier, on a printed circuit board or in a pre-amplifier circuit, a resistor or an impedance is connected to either or both of the anode side and the cathode side of a photo detector. A bypass capacitor of bias power supply for photo detector is grounded either directly or via a resistor or an impedance.
