Optical transmission module
Granted: January 31, 2012
Patent Number:
8107823
In an optical transmission module having a communication module which is freely movable in a case, when a tensile force is generated on an optical cable after connection of an optical transmission module, optical coupling surface and an optical axis center follow each other and thus stable optical transmission can be constantly performed.
Optical semiconductor device with flexible substrate
Granted: January 31, 2012
Patent Number:
8106408
A metal pattern for a high frequency signal is patterned on a flexile substrate, and the flexile substrate is bent in such a way as to form a substantially right angle at a spot corresponding to an end of the metal pattern for the signal. And an end of the metal pattern is fixedly attached to a lead pin for signaling, attached to a stem, for electrical continuity, so as to be in a posture horizontal with each other. Meanwhile, a part of the lead pins attached to the stem, being in such a…
Optical transmitter
Granted: January 17, 2012
Patent Number:
8098998
A technology to automatically control the biasing of an optical duobinary transmitter using a single-drive LN-MZ modulator is provided. A low-frequency signal is amplitude modulated onto a voltage signal input into a Mach-Zehnder optical modulator 22. The optical output from the optical modulator 22 is detected by an optical detection subsystem 30. In a bias control subsystem 40, the low-frequency signal component amplitude modulated onto the electrical signal is detected from the…
Optical transmitting module and optical transmitting device
Granted: December 13, 2011
Patent Number:
8077750
An optical transmitting module of a coaxial type is provided in which a disturbance in a waveform of light which is output from a semiconductor laser element due to a signal which is output from an optical modulator unit can be suppressed. The optical transmitting module comprises an optical transmitting package of a coaxial type and a line board (40) connected to the optical transmitting package. The optical transmitting package comprises a semiconductor laser element, an optical…
Semiconductor optical device
Granted: November 29, 2011
Patent Number:
8068526
A purpose is to provide a semiconductor optical device having good characteristics to be formed on a semi-insulating InP substrate. Firstly, a semi-insulating substrate including a Ru—InP layer on a conductive substrate is used. Secondly, a semi-insulating substrate including a Ru—InP layer on a Ru—InP substrate or an Fe—InP substrate is used and semiconductor layers of an n-type semiconductor layer, a quantum-well layer, and a p-type semiconductor layer are stacked in this…
Polarization monitoring in polarization division multiplexing in optical communications
Granted: October 4, 2011
Patent Number:
8032025
Systems and techniques for optical communications based on polarization division multiplexing are described.
Optical receivers with controllable transfer function bandwidth and gain imbalance
Granted: September 20, 2011
Patent Number:
8023833
Techniques, devices and systems based on optical receivers with controllable transfer function bandwidth and gain imbalance.
Semiconductor element and manufacturing method thereof
Granted: August 16, 2011
Patent Number:
7998766
A semiconductor element and a manufacturing method of the semiconductor element are provided. A ridge waveguide type semiconductor integrated element includes: an electrode of an EA portion and an electrode of an LD portion which are arranged so as to be away from each other; a contact layer of the EA portion and a contact layer of the LD portion which are arranged so as to be away from each other and in each of which the electrode is formed on an upper surface and an edge of at least a…
Laser device and controlling method therefor
Granted: August 16, 2011
Patent Number:
8000359
A laser device capable of preventing deterioration of a light signal and a controlling method therefor are provided. A wavelength tunable laser module provided with a resonator including the wavelength tunable filter and a semiconductor light amplifier having a phase adjustment region and a light amplifying region, in which a wavelength margin between a peak transmission wavelength of a wavelength tunable filter and a mode hop occurring wavelength on a short wave side is smaller than…
Nitride semiconductor light emitting device and method of manufacturing the same
Granted: August 16, 2011
Patent Number:
8000364
The present invention provides a nitride semiconductor light emitting device having an n-type ohmic electrode with an Au face excellent in ohmic contacts and in mounting properties, and a method of manufacturing the same. The device uses an n-type ohmic electrode having a laminate structure that is composed of: a first layer containing Al as a main ingredient and having a thickness not greater than 10 nm or not less than 3 nm; a second layer containing one or more metals selected from Mo…
Optical receiver having bandwidth control for intersymbol interference compensation
Granted: August 2, 2011
Patent Number:
7991300
Apparatus and techniques for receiving and processing an optical signal. In one implementation, an optical receiver is provided to include a delay line interferometer, an etalon, and a data estimator for estimating the data carried on a differentially modulated optical input signal. The delay line interferometer receives the input signal and issues differentially decoded constructive and destructive signals. The etalon filters the constructive signal with a transmission stopband imposed…
Optical communication module and flexible printed circuit board
Granted: July 26, 2011
Patent Number:
7986020
A flexible printed circuit board includes: a signal wiring pattern including: a transmission line for connecting an end of an optical device with an end of a signal generation circuit; and another transmission line for connecting another end of the optical device with another end of the signal generation circuit; a thin film resistor layer formed in a region including a region facing the signal wiring pattern so as to constitute a first microstrip line together with each of the…
Adjustable bit rate optical transmission using programmable signal modulation
Granted: July 26, 2011
Patent Number:
7986878
Techniques, apparatus and systems to provide adjustable bit rate optical transmission using programmable signal modulation in optical communication systems.
Optical receiver having FSR phase compensation
Granted: July 19, 2011
Patent Number:
7983573
An optical receiver apparatus and methods for mitigating intersymbol interference (ISI) in a differentially-encoded modulation transmission system by controlling constructive and destructive transfer functions. The receiver includes a bandwidth control element for controlling transfer function bandwidth, a transfer phase controller for controlling transfer function phase and/or an imbalancer for imbalancing the transfer functions for compensating for intersymbol interference and…
GT decoder having bandwidth control for ISI compensation
Granted: June 28, 2011
Patent Number:
7970289
An optical receiver apparatus and methods for mitigating intersymbol interference (ISI) in a differentially-encoded modulation transmission system by controlling constructive and destructive transfer functions. The receiver includes a bandwidth control element for controlling transfer function bandwidth, a transfer phase controller for controlling transfer function phase and/or an imbalancer for imbalancing the transfer functions for compensating for intersymbol interference and…
Transmission system and transmission method
Granted: May 31, 2011
Patent Number:
7953095
Provided is a transmission system with increased degree of freedom in a lane configuration, which corrects disalignment of data sequences in respective channels due to differences in arrival time, thereby freely changing a number of lanes. The transmission system includes: a transmitter; a relay; and a receiver, the transmitter inputting data to be transmitted to the receiver, the relay transmitting the data transmitted by the transmitter to the receiver, the receiver receiving the data…
Semiconductor laser diode and optical module employing the same
Granted: April 26, 2011
Patent Number:
7933304
It is an object of the present invention to realize a low cost laser light source capable of emitting several mW optical power while the operation current is reduced. In particular, the present invention concerns a 1.3 ?m wavelength band laser device suitable for several to several ten km short distance fiber optic transmission and also a less power consuming optical communication module in which such a laser is preferably mounted. As a laser structure which eliminates the necessity of…
Optical receiver module
Granted: February 22, 2011
Patent Number:
7894726
A semiconductor chip on which a light receiving element is mounted, a preamplifier for amplifying an output signal from the light receiving element, and an insulating carrier substrate on which the light receiving element is mounted are connected such that the output signal from the light receiving element is input to the preamplifier through electrodes on the carrier substrate, and there are provided two electrodes, on the carrier substrate, having a capacitance value of 40 fF or more…
Semiconductor optical receiver device, optical receiver module, and method for manufacturing semiconductor optical receiver device
Granted: January 25, 2011
Patent Number:
7875905
A semiconductor optical receiver device is provided, which a mesa comprising a plurality of semiconductor crystal layers formed on a semiconductor substrate including a pn junction having a first conductive semiconductor crystal layer and a second conductive semiconductor crystal layer and including a first contact layer on the semiconductor substrate, a plurality of electrodes to apply electric field to the pn junction are coupled on the semiconductor substrate, a second contact layer…
Semiconductor laser device and method of manufacturing the same
Granted: December 21, 2010
Patent Number:
7855093
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…
