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7630644 |
Optical add/drop multiplexer, control method therefor and control program therefor
The present invention provides an optical add/drop multiplexer including an optical power control unit for performing a control of an optical power by the unit of each signal light included in the...
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7630643 |
Multimode optical transmission system and multimode optical transmission method
Provided is a multimode optical transmission system capable of reducing an influence of multimode dispersion occurring when an optical signal is transmitted in multimode. Light sources ( 101 to ...
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7627248 |
Method for pre-emphasis of optical signals in a transmission system comprising add-drop-modules
A method for pre-emphasising transmitted signals in channels for multiplex signals along a transmission path comprising supply and/or branch points is provided. According to the method, relative...
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7613398 |
Wavelength-tunable light source and wavelength-division multiplexed transmission system using the source
The present invention relates to a wavelength-tunable light source whose output wavelength can be externally controlled and a wavelength-division multiplexed transmission system using the source. ...
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7603037 |
Ultra-dense wavelength and subcarrier multiplexed optical and RF/mm-wave transmission system
Disclosed is a method and apparatus for optically modulating and transmitting source data. An optical comb comprising optical tones having a frequency spacing equal to Δf is generated by an...
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7593647 |
Apparatuses and methods for automatic wavelength locking of an optical transmitter to the wavelength of an injected incoherent light signal
An optical transmitter has a resonance wavelength characteristic that varies with the refractive index of the optical transmitter. The optical transmitter receives a narrow band injected wavelength...
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7574137 |
Multi-wavelength time-coincident optical communications system and methods thereof
An optical communications transmitter includes a oscillator source, producing a clock signal, a data source, producing a data signal, a modulating circuit for modulating the clock signal using the...
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7570845 |
Deployment of electro-optic amplitude varying elements (AVEs) and electro-optic multi-functional elements (MFEs) in photonic integrated circuits (PICs)
Electro-optic amplitude varying elements (AVEs) or electro-optic multi-function elements (MFEs) are integrated into signal channels of photonic integrated circuits (PICs) or at the output of such...
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7555222 |
Multiformat transmitter
Methods and apparatus for supporting a plurality of modulation formats using a single transmitter are disclosed. According to one aspect of the present invention, a transmitter arrangement that...
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7551855 |
D(WDM) communications network employing periodic spectral multiplex processing
A WDM network (R) comprises an optical fiber (F) connected to a hub (H) via an input of a demultiplexer (DX) having N outputs to communications stations (S i -S n ) able to deliver and/or receive...
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7526205 |
Transmission system
A wavelength division multiplexing transmission system, the system comprising: a plurality of channels at different wavelengths, each channel comprising a transmitter, a receiver, and one or more...
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7519246 |
Photonic integrated circuit (PIC) chips
A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other...
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7515833 |
Optical double sideband modulation technique with increased spectral efficiency
An all optical network for optical signal traffic has at least a first ring with at least one transmitter and one receiver. The first ring includes a plurality of network nodes. At least a first...
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7512295 |
Transmitter photonic integrated circuits (TXPICS) with directly modulated lasers and wavelength selective combiners
A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other...
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7489838 |
Optical transmitter
An optical transmitter comprises an array of modulated sources having different operating wavelengths approximating a standardized wavelength grid and providing signal outputs of different...
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7483635 |
Multi-wavelength pulse generator using time-lens compression
A method and apparatus for generating a multi-wavelength pulse train use a technique referred to as time-lens compression. The time-lens is formed of a phase modulator in series with a dispersion...
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7480464 |
Widely tunable, dispersion tolerant transmitter
An optical transmitter comprising:
(i) an electrical switch; (ii) a laser array comprising a plurality of tunable laser elements; and (iii) an Optical Spectrum Reshaper (OSR) used to reshape...
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7477807 |
Monolithic transmitter photonic integrated circuit (TxPIC) semiconductor chip
A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other...
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7471857 |
Method of tuning optical components integrated in a monolithic photonic integrated circuit (PIC)
An optical transmitter comprises a monolithic transmitter photonic integrated circuit (TxPIC) chip that includes an array of modulated sources formed on the PIC chip and having different operating...
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7469102 |
Wavelength-division-multiplexing passive optical network utilizing fiber fault detectors and/or wavelength tracking components
Various methods, systems, and apparatuses is described in which a passive-opticalnetwork includes a first multiplexer/demultiplexer, a second multiplexer/demultiplexer, a wavelength tracking...
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7457634 |
Communication terminal, communication state information providing system, and method of providing communication state information
The communication state information providing system comprises a cellular phone of an information provider, and an information providing device having an information receiving unit for receiving,...
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7450844 |
WDM optical transmission equipment with redundant configuration, and wavelength control method of light output in standby system
WDM optical tranmsmission equipment with redundant configuration includes a plurality of tranmitters. Each tranmitter includes active and standby panels including active and standby optical...
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7447436 |
Optical communications using multiplexed single sideband transmission and heterodyne detection
A transmitter subsystem generates an optical signal which contains multiple subbands of information. The subbands have different polarizations. For example, in one approach, two or more optical...
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7447446 |
Light source apparatus, and method for switching redundancy of the light source
The present invention relates to a light source apparatus. The light source apparatus includes a plurality of optical pulse train generation sections; an optical switch section capable of...
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7421209 |
Optical wavelength multiplexing FSK modulation method
An optical wavelength multiplexing frequency shift keying modulation system. The system includes an optical wavelength multiplexing signal acquisition unit for outputting an optical wavelength...
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7421203 |
Method for transmitting packet in wireless access network based on wavelength identification code scheme
A method for transmitting a packet in a wireless access network based on a wavelength identification code scheme. The method comprises the steps of connecting n number of RNCs (Radio Network...
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7398021 |
Optical transmitter and passive optical network using the same
An optical transmitter including a multi-lambda source to output injection light consisting of a plurality of injection wavelengths in channels, a circulator having a first port, a second port, and...
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7394985 |
Wavelength access server (WAS) architecture
A wavelength access server (WAS) architecture provides aggregation of traffic streams of diverse data communication protocols as well as provision of wavelength resources in an optical transport...
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7389047 |
Optical ring transmission network
The network comprises an optical ring link (F) and a concentrator (HUB) that sends via one end of the link “downlink” optical signals carried by respective wavelengths and receives “uplink”...
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7389048 |
Optical wavelength-division multiple access system and optical network unit
The present invention provides an optical wavelength-division multiple access system and a corresponding optical network unit. A wavelength band Da (wavelengths λd 1 to λdn) for downlink optical...
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7386236 |
Multiple wavelength TDMA optical network
A passive optical network which employs multiple wavelengths to increase overall system bandwidth, with each wavelength being shared by multiple optical network units (ONUs) according to a time...
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7382958 |
Photonic crystal wave guide optical spectrometer
An optical instrument for splitting optical spectrum, comprising a series of hollow core optical wave guides ( 12, 22 , and so on) connected by optical couplers ( 16, 26 , and so on) transporting...
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7379088 |
System and method for real-time image control and processing for use in wide area space based surveillance
A system and method for providing real-time imaging for use in wide area space based surveillance utilizing an Optical Tera-bps Satellite (OPTSAT) network, including a plurality of OPTSATs, wherein...
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7379672 |
Photonic 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...
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7349631 |
Wavelength-tunable light source and wavelength-division multiplexed transmission system using the source
The present invention relates to a wavelength-tunable light source whose output wavelength can be externally controlled and a wavelength-division multiplexed transmission system using the source. ...
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7330657 |
Method to demultiplex wavelengths of light
An apparatus and method for demultiplexing multiple wavelengths of light. In one embodiment, an optical signal having a plurality of wavelengths is provided to an optical-to-electrical (OE) circuit...
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7330660 |
Optical time division multiplexer
A TDM comprising: (a) at least two wavelength-tunable devices for outputting a signal, each wavelength-tunable device being adapted to change signal wavelength in response to a change signal; (b) a...
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7321733 |
Split-band optical transmission system and optical transmission method used therein
An optical transmission system including an optical transmitting device and an optical receiving device. The optical transmitting device includes a data signal splitting section for splitting data...
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7302182 |
Methods and apparatus for sensing multiple wavelengths simultaneously in a single wavelength sensing device
A method and system provide for sensing multiple wavelengths simultaneously in a single wavelength sensing device. The system may have a plurality of laser signals and a plurality of identifiable...
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7286765 |
Configurable optical signal processing device with wideband sources
A device for processing optical signals comprises sources each delivering, substantially simultaneously, optical signals in accordance with a comb of at least two different wavelengths or a...
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7283694 |
Transmitter photonic integrated circuits (TxPIC) and optical transport networks employing TxPICs
A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other...
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7280763 |
Terminal apparatus and controlling method for optical output power
A terminal apparatus by which, even where BER data, for example, of an optical signal of an existing wavelength cannot be utilized, the optical output powers of the existing wavelength and an...
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7272323 |
Bi-directional electrical to optical converter module
A bi-directional (BiDi) electrical to optical converter (transceiver) module is described that contains means for communicating in a full duplex fashion over one fiber. Furthermore, an automatic...
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7263291 |
Wavelength division multiplexing source using multifunctional filters
This invention provides a system that combines a wavelength multiplexer with an FM discriminator for chirp reduction and wavelength locker in a filter to produce a wavelength division multiplexed...
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RE39785 |
System for optically transmitting frequency-division-multiplexed signal and transmitter therefor
In an optical transmission system, a multiplexer frequency-division-multiplexes a plurality of signals, and outputs the resultant signal to an FM modulator. The FM modulator converts the...
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7254338 |
Multi-wavelength light source
A multi-wavelength light source unit for optical communication system is disclosed. The light source includes a demultiplexer for demultiplexing a multiplexed light signal into a plurality of...
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7254333 |
Low-cost WDM terminal device accommodating plurality of client signal
A WDM (Wavelength Division Multiplex) terminal device located in a WDM network includes a multiplexing unit that multiplexes a wavelength of a client signal having a single wavelength or a...
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7245829 |
Architecture for dynamic connectivity in an edge photonic network architecture
A network arrangement for aggregation of groups of tunable sources in a photonic network is disclosed. The network arrangement includes transmit edge elements having a plurality of tunable optical...
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7212708 |
Optical grating based multiplexer device with power tap capability
In an optical grating device, a grating arrangement receives different wavelength output signals from a plurality of radiation sources at input ports thereof, and generates therefrom a multiplexed...
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7209660 |
Optical communications using heterodyne detection
An optical communications system includes a receiver subsystem with at least two heterodyne receivers. The receiver subsystem receives a composite optical signal having two or more subbands of...
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