BACKSIDE ILLUMINATED SEMICONDUCTOR LIGHT-RECEIVING DEVICE, OPTICAL RECEIVER MODULE, AND OPTICAL TRANSCEIVER
Granted: November 24, 2011
Application Number:
20110286083
Provided is a backside illuminated semiconductor light-receiving device enhancing a frequency characteristic without deteriorating assembling operability. The light-receiving device includes a rectangular substrate; a light receiving mesa portion formed on a center portion of one side on a front surface of the substrate and includes a PN junction portion; a P-type electrode formed on the light receiving mesa portion and conductive with one side of the PN junction portion; an N-type…
SUB-RATE SAMPLING IN COHERENT OPTICAL RECEIVERS
Granted: September 29, 2011
Application Number:
20110236025
Apparatus and methods for optimizing the interplay between the sampling rate of an ADC of a receiver system and a bandwidth of analog anti-aliasing filters are described. The described technology can be used to mitigate aliasing for receiver systems that operate at fractional sampling rates by optimizing a bandwidth of optical and electrical filters included in the receiver systems.
Optical Receiver
Granted: December 9, 2010
Application Number:
20100310260
The interference phases of two optical delay line interferometers of an optical receiver adopting the DQPSK or the like are stabilized at points, which have a difference of 90°, without bifurcation of a receiving signal or receiving data. A low-speed photocurrent flowing through the current source terminal of a photodetector that receives interfering light outputted from an optical delay line interferometer is detected. The interference phase is identified by utilizing a variation in…
Optical Receivers with Controllable Transfer Function Bandwidth and Gain Imbalance
Granted: November 11, 2010
Application Number:
20100284702
Techniques, devices and systems based on optical receivers with controllable transfer function bandwidth and gain imbalance.
OPTICAL MODULE
Granted: August 26, 2010
Application Number:
20100215324
An optical module having a flexible substrate having, even after actual manufacturing steps, excellent transmission characteristics of high-frequency signals and an advantage that electromagnetic field radiation is reduced even when it is connected with a package. The flexible substrate used in external connection of the package of the optical module uses a flexible substrate having a coplanar line to which a lead pin is fixedly attached, a grounded coplanar line which is in contact with…
NITRIDE SEMICONDUCTOR OPTICAL ELEMENT AND MANUFACTURING METHOD THEREOF
Granted: June 17, 2010
Application Number:
20100150194
In an InGaN-based nitride semiconductor optical device having a long wavelength (440 nm or more) equal to or more than that of blue, the increase of a wavelength is realized while suppressing In (Indium) segregation and deterioration of crystallinity. In the manufacture of an InGaN-based nitride semiconductor optical device having an InGaN-based quantum well active layer including an InGaN well layer and an InGaN barrier layer, a step of growing the InGaN barrier layer includes: a first…
WAVELENGTH TUNABLE FILTER AND WAVELENGTH TUNABLE LASER MODULE
Granted: June 10, 2010
Application Number:
20100142568
Disclosed are a wavelength tunable filter and a wavelength tunable laser module that are of a codirectional coupler type whose characteristics do not significantly vary with a process error. They are structured so as to include a semiconductor substrate which has a first optical waveguide and a second optical waveguide. The first and the second optical waveguide are extended from a first side of the semiconductor substrate to an opposing second side thereof. The first optical waveguide…
OPTICAL TRANSCEIVER AND PROJECTION COVERING MEMBER
Granted: March 25, 2010
Application Number:
20100074574
Provided are an optical transceiver and a projection covering member that can suppress EMI noise radiated from a pig-tail part. An elastic covering member for covering a projection which includes an optical coupler of an optical sub assembly is made of a conductive elastic material having predetermined resistivity. At least a part of an outer circumference surface of the elastic covering member comes into intimate contact with an outer periphery of a conductive opening part of a case…
SEMICONDUCTOR LASER DEVICE AND METHOD OF MANUFACTURING THE SAME
Granted: January 28, 2010
Application Number:
20100022043
A method of manufacturing semiconductor laser device capable of reducing ?L, with manufacturing restrictions satisfied, is provided. In a distributed-feedback or distributed-reflective semiconductor laser device, immediately before burying regrowth of a diffraction grating, halogen-based gas is introduced to a reactor, and etching is performed on the diffraction grating so that each side wall has at least two or more crystal faces and a ratio of length of an upper side in a waveguide…
Green Laser System
Granted: September 17, 2009
Application Number:
20090232168
A green laser is made by constructing a laser cavity that includes within it a laser diode, a non-linear crystal such as KTP, and a lens. The boundaries of the cavity are not defined by the ends of the diode itself, but are instead defined by the ends of an apparatus that includes the lens and the KTP or similar crystal.
System and Method for Viewing Projected Light From Portable Devices
Granted: April 16, 2009
Application Number:
20090097111
An apparatus is disclosed which may include a sheet of reflective material suitable for forming a display screen; a screen control mechanism operable to move the reflective material into extended and retracted positions, wherein the apparatus is portable and configured to receive image data from a hand-held projection device.
Semiconductor optical amplifier and optical module using the same
Granted: July 27, 2006
Application Number:
20060165363
The present invention provides a polarization dependency-free, gain-saturated high function semiconductor optical amplifier and optical module at industrially low cost. The gist of the present invention is to structurally separate the optical signal propagating waveguide from another optical waveguide which serves as a lasing optical cavity for optical amplification in such a manner that the two optical waveguides are formed in the same plane but not parallel to each other.
Optical transmission module
Granted: February 3, 2005
Application Number:
20050025202
The present invention provides an optical transmission module configured such that a driver IC chip to drive a semiconductor laser device, a first insulation plate having the semiconductor laser device mounted thereon and a coupling optical component are mounted in this order, a thin film inductor element and thin film resistor element which are connected in parallel are formed on a second insulation plate and a bias current is supplied to the semiconductor laser device via this LR…
Semiconductor optical amplifier, and optical module using the same
Granted: February 3, 2005
Application Number:
20050025414
The present invention provides a polarization dependency-free, gain-saturated high function semiconductor optical amplifier and optical module at industrially low cost. The gist of the present invention is to structurally separate the optical signal propagating waveguide from another optical waveguide which serves as a lasing optical cavity for optical amplification in such a manner that the two optical waveguides are formed in the same plane but not parallel to each other.
Optical module and optical transmission apparatus
Granted: December 30, 2004
Application Number:
20040264835
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 transmission module
Granted: December 30, 2004
Application Number:
20040264882
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 module and method for manufacturing optical module
Granted: December 2, 2004
Application Number:
20040240087
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 communication module
Granted: October 21, 2004
Application Number:
20040208211
A ceramic substrate is provided through a stem of a can-package, the desired number of wirings including the high speed signal wirings are formed on this ceramic substrate and the necessary electronic components other than a light-emitting/photosensitive element such as driver LSI and amplifying LSI or the like are also accommodated within the can-package. Moreover, the solder connecting points of a transmitting can-package and a receiving can-package, which are respectively provided, on…
Optical communication device, optical transmitter, optical transmitter-receiver, and optical transmission system
Granted: October 21, 2004
Application Number:
20040208633
The printed circuit board with the respective components of the optical transmitter-receiver mounted thereon is split into several parts, the fixing position of which respective parts with regard to the housing is set according to the standardized size of the respective components and which respective parts are interconnected through an electric connector and so forth, which makes the height of the transmitter-receiver lower. The split circuit boards are overlapped such that they make no…
Directly modulated optical module and method for driving semiconductor laser included therein
Granted: September 9, 2004
Application Number:
20040174916
In a directly modulated optical module, the input current to drive the semiconductor laser is controlled so as to make a rate of change in fall time smaller than a rate of change in rise time (inclination) in order to improve the eye opening of an eye pattern and extend the transmission distance. In addition, the input current is overshot at least during the period of transient state following the rising edge.
