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Class 398/90 - Electrically controlled single source


Subclass of Class 398 - Optical communications
Definition: Subject matter wherein a single source of light is either
No. of patents: 41
Last issue date: 05/03/2011


1    
NumberTitleIssue Date
7936994Broadband light source using fabry perot laser diodes
Disclosed is a broadband light source (BLS) necessary to implement wavelength-locked Fabry-Perot (FP) laser diodes (LDs) applicable to an optical subscriber network The BLS is based on a method using mutual injection of low-cost FP LDs and a method using FP LDs unde...
05/03/2011
7447435Passive optical network
Disclosed is a passive optical network comprising a central office including a plurality of first reflective semiconductor optical amplifiers of a quantum-dot type, each of which generates a wavelength-seeded downstream optical signal on a downstream channel of a co...
11/04/2008
7379672Photonic RF distribution system
The present photonic RF generation and distribution system provides a system and method for distributing an RF output signal. The photonic RF distribution system includes two optical sources for generating optical signals. A first optical source (42) is opera...
05/27/2008
7231150Method and apparatus for sensing a temperature along an optical path in semiconductor material
A temperature sensing and control method and apparatus. In one aspect of the present invention, an apparatus according to the teachings of the present invention includes an optical path disposed in semiconductor material. A four-terminal resistor is defined in the s...
06/12/2007
7110675Methods of optical communication and optical communication systems
Methods of optical communication and optical communication systems are described. According to a first aspect, a method of optical communication includes providing an optical signal and providing a plurality of data signals. This aspect also includes passing a plura...
09/19/2006
7103277Fiber-to-the-premise architectures
An optical architecture is provided comprising a plurality of mod/mux units, a master optical distribution hub, a plurality of additional optical distribution hubs, and a plurality of premise stations. Each of the mod/mux units is configured to (i) permit selective ...
09/05/2006
7103287Method for remodulating an optical stream with independent data
A method and apparatus for remodulating an optical data stream such that a second modulated data stream is optically transported along with a first modulated data stream. In one embodiment, an optical signal having modulated thereon a first data stream is split into...
09/05/2006
7043211Universal modulator
A modulator generates a combined signal consisting of audio and video signals and converts the combined signal to one of a plurality of frequencies in dependence upon a desired output frequency and broadcast standard. The modulator includes a summing amplifier, a fi...
05/09/2006
7031611Optical routers using angular position amplification modules
An optical routing device for coupling each of a plurality NE of optical incoming channels (1) to one of a plurality NS of optical output channels (5) and for orienting each of the optical beams coming through the incoming channel...
04/18/2006
6961523Optical multiplexing interconnect module
In an optical multiplexing interconnection module, first and second NRZ input signals synchronous by clock signal are inputted to its input section. The first NRZ input signal is converted to a first RZ signal according to a logical product with a clock signal CLK b...
11/01/2005
6959152Polarization scrambler and optical network using the same
To generate light with the degree of polarization zeroed and the spread of an optical spectrum suppressed even with temporal overlapping between optical pulses each of which is polarized orthogonally to the succeeding pulse, a polarization scrambler includes an opti...
10/25/2005
6907201Optical power transient control system and method
A system and method for optical power transient control and prevention in communication networks. An optical signal propagating on a network is demultiplexed into individual spectral bands, e.g. at an OADM, and an optical power monitor point is included into each ba...
06/14/2005
6836574Optical domain optical signal sampling device
The optical domain optical signal sampling device comprises an electrical sampling pulse source and an electrically-controlled optical modulator. The electrically-controlled optical modulator comprises electro-optical material, an optical waveguide located in the el...
12/28/2004
6384947Two path digital wavelength stabilization
A method and apparatus for stabilizing the wavelength of a laser are disclosed. The invention provides a way to stabilize a laser for applications in dense wavelength division multiplexing (DWDM) systems where frequency spacing is crucial. The invention a...
05/07/2002
6317243Optical upconverter apparatuses, methods and systems
Apparatuses, methods, and systems are disclosed that provide for simultaneously upconverting electrical signals carrying information at electric frequencies onto optical subcarrier lightwave frequencies that are greater and less than the carrier frequency...
11/13/2001
6175436Automatic feedback gain control for multiple channels in a doped optical fiber amplifier
An apparatus and method for controlling the gain in an erbium-doped fiber amplifier (EDFA) incorporated into a multi-wavelength communication system so as to amplify each of the wavelength signals. The amplifier operates near to saturation so that, if one...
01/16/2001
6151147Optical communication apparatus
An optical communication apparatus is provided that enhances the reliability of light source by extending the lifetime thereof without requiring a power supply line to generate the light signal. The light source produces light of a wide wavelength band wh...
11/21/2000
6141131Methods and apparatuses for high-speed control of lamp intensities and/or wavelengths and for high-speed optical data transmission
Methods and apparatuses for high-speed control of lamp intensity and for high-speed optical data communication are disclosed. In particular embodiments, an arc, plasma or halogen lamp is provided with the ability to change wavelengths and/or intensities a...
10/31/2000
6081355Multi-wavelength light source
An optical pulse train generated by an optical pulse generator and an oscillator is coupled into a polarization switcher to polarize two successive pulses perpendicular to each other. The optical pulse train is amplified by an EDFA, then entered into an S...
06/27/2000
6081361Sub-carrier multiplexing in broadband optical networks
In a WDM fiber-optic network, a unique laser transmitter enables signals to be routed at three hierarchical levels: at one level discrimination among signal paths is based on N WDM wavelength channels, at another level discrimination is based on m AM subc...
06/27/2000
6072612WDM transmitter for optical networks using a loop-back spectrally sliced light emitting device
An apparatus and method pulses a broadband optical source such as an LED, and generates multiple optical wavelength signals channels which are time division multiplexed onto a single optical channel. The multiple optical wavelength signals may subsequentl...
06/06/2000
6064503Light source for wavelength division multiplexing communications
Disclosed is a light source for wavelength division multiplexing communications which has: a unit for outputting light with a wavelength band having a constant width; a unit for dividing the light into first dividied light and second divided light; at lea...
05/16/2000
5978119System and method for synchronizing an optical source and a router in a wavelength division multiplexed fiber optic network
A system and method for maintaining alignment between a source and router in a Wavelength Division Multiplexed (WDM) fiber optic network. In a preferred embodiment, a narrow band of the wavelengths emitted by the WDM source is designated as a monitor chan...
11/02/1999
5936752WDM source for access applications
The present invention provides an apparatus and method for a single-source wavelength division multiplexed (WDM) signal. According to the invention, light from a broad wavelength bandwidth or multiwavelength source is delivered, over one or more input opt...
08/10/1999
5936753Optical network system
An optical network system for bidirectional transmission between a main system (e.g., central station) and a plurality of auxiliary systems (e.g., subscriber's stations). The main system outputs a main optical signal to a main fiber. The auxiliary systems...
08/10/1999
5912749Call admission control in cellular networks
A unique time slot is assigned to each of a plurality of wavelengths emitted by a single, centralized wavelength division multiplexed optical source to provide a "bit interleaved" WDM signal. In accordance with an illustrative embodiment of the present in...
06/15/1999
5805317Acousto-optic channelizer-based ultra-wideband signal processor
An ultra-wideband signal processor, such as that employed for processing narrow time domain radar return pulses, includes a coherent acousto-optic Bragg cell channelizer having a plurality of IF outputs from which a plurality of IF output signals respecti...
09/08/1998
5767995System and methods for assessing the suitability of analog lasers for broadband access applications
A system and method for predicting the ratio of the strength of the carrier signal to the strength of nonlinear distortion (C/NLD) generated by a communications laser is disclosed. The method jointly evaluates the individual distortion components arising ...
06/16/1998
5729369Method of tracking a plurality of discrete wavelengths of a multifrequency optical signal for use in a passive optical network telecommunications system
In a fiber optic communication system, a multifrequency light source generates a signal having a plurality of discrete and temporally spaced wavelengths. The wavelengths can be modulated with data for transmission in an optic medium. The multifrequency li...
03/17/1998
5576881Multi-frequency optical signal source having reduced distortion and crosstalk
A multi-frequency optical signal source is adapted to include a plurality of power splitters, each connected to obtain a portion of an electrical data signal used to modulate a different one of the plurality of input optical sources; a plurality of delay ...
11/19/1996
5550666Wavelength division multiplexed multi-frequency optical source and broadband incoherent optical source
A wavelength division multiplexing multi-frequency optical source is used to provide downstream transmission of information signals at discrete optical wavelengths from a central office to a plurality of optical network units. A passive optical demultiple...
08/27/1996
5526155High-density optical wavelength division multiplexing
The present invention provides an apparatus and method for high-density optical wavelength division multiplexing (WDM) using a single optical source. An optical wavelength division multiplexer in accordance with the present invention includes an optical s...
06/11/1996
5450510Wavelength division multiplexed optical modulator and multiplexing method using same
A method and apparatus for automatically providing for both multiplexing and independent external modulation of two or more wavelengths emitted by a multi-longitudinal mode laser. The present invention uses an integrated optics device chip to enable coupl...
09/12/1995
5448392Process for the optical transmission of a multiplex of electrical carriers and apparatus for performing such a process
A process and apparatus for the optical transmission of a multiplex of a electrical carriers in which production takes place, from the electrical signal corresponding to the multiplex of electrical carriers, of an electrical asymmetrization signal, whose ...
09/05/1995
5400166Communication of signals sharing a single optical source
A single optical source is shared by a plurality of optical communication paths to communicate different information signals on the different paths. A high power optical carrier generator provides a carrier signal to an optical multiplexer. The multiplexe...
03/21/1995
5299045Light detecting apparatus having a diffraction grating
A light detector provides wavelength tracking, monitoring or similar function by forming a diffraction grating in a light waveguide. Diffracted light from the waveguide is received by a light detecting device having multiple detecting portions. Changes in...
03/29/1994
5216532Optical multiplexing
An optical multiplexing system has several optical sensors connected in parallel between a source and a detector, the path length between source and detector via each sensor being different. The source is modulated at a number of different frequencies, th...
06/01/1993
5146358Optical communications system and method for transmitting information through a single optical waveguide
An optical communication system for communicating information. The systems includes a source of continuous wave laser light and one or more acoustic beams whcih are frequency or amplitude modulated by data. The laser light beam and the acoustic beams are ...
09/08/1992
5128790Optical cable television transmission system
To transmit a frequency-division multiplex signal occupying a broad frequency band, e.g., the 40-440 MHz cable television frequency band, over an optical-fiber transmission link, in the transmitter, the whole frequency band to be transmitted is converted ...
07/07/1992
4959827Laser signal mixer circuit
A circuit for mixing audio, video and data signals for transmission by laser link. The data signal is first modulated by frequency shift keying and then, after passing through a bandpass filter, is mixed with the audio signal and then frequency modulated ...
09/25/1990
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