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7620318 |
Optical transceiver using heterodyne detection and a transmitted reference clock
A heterodyne communication system uses coherent data modulation that is resistant to phase noise. In particular, a pilot tone and reference clock signal are transmitted along with the modulated...
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7609974 |
Data transmission method and a system thereof
An optical transmitter generates a transmission signal having a frame as a unit, the frame including a signal pilot signal with fixed amplitude and phase and two data bits to output the generated...
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7583902 |
Module to module signaling utilizing amplitude modulation
A method and apparatus configured to incorporate system data for transmission as part of or concurrently with network data. The system data may comprise communication system data for use in...
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7580632 |
Method and apparatus for managing lightpaths in optically-routed networks
A system and method that utilizes digital coding techniques to combine a high-rate data stream with a lower rate side data stream to produce a combined data stream in such a way that the side data...
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7577358 |
Apparatus, system and method for optical packet switching using frequency header
In the present invention, a single-frequency tone is used as addressing header for each optical packet. The frequency of the single-frequency tone is situated within the baseband of the digital...
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7551858 |
Signal identification in optical communications networks
Signals in an optical communications network, such as optical channels in an optical WDM network for example, are each identified by at least two low frequency dither tones with which the signal is...
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7542678 |
Method and apparatus for a supervisory channel in a WDM fiber-optic communication system
A method and apparatus for providing a supervisory channel in a wavelength division multiplexing (WDM) fiber-optic communication system uses a controlled optical attenuator disposed in an optical...
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7539413 |
Observation apparatus and observation system
The present invention discloses a submarine observation system in which a plurality of carrier lights assigned to each submarine observation equipment is transmitted from a land terminal apparatus...
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7509047 |
System and method for subcarrier modulation in ISM band as supervisory channel
Apparatus and method for transmitting a supervisory signal for optical network applications. The apparatus includes a subcarrier transmission system configured to receive a first supervisory signal...
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7505685 |
Wavelength-division multiplex communication system and apparatus
In the WDM communication system, in the absence of data to be transmitted on an optical channel, a pilot signal transmitting means transmits the channel-unique pilot signal data on the channel. A...
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7457549 |
Sub signal modulation apparatus, sub signal demodulation apparatus, and sub signal modulation demodulation system
A sub signal modulation apparatus, with the intention of stabilized transmission of a sub signal superimposed on main signal light irrespective of the intensity of the main signal light when used...
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7418212 |
Electrical detection of optical symbols
A system and method for detecting digital symbols carried in a received optical signal. The system comprises a functional element operative to receive a stream of samples of an electrical signal...
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7412165 |
DCC loop plug
Systems and methods are disclosed for testing the functionality of a synchronous optical network having a data communication channel therein. The system includes a testing device connected to a...
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7412166 |
Pilot tones for optical signal wavelength identification and power measurement
A method of optical communication includes providing a plurality of optical signals each associated with a distinct channel of a composite optical signal. A unique pilot tone signature is...
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7389044 |
Method and system for providing a signature signal in an optical network in the event of loss of a client
An optical network including multiple nodes is subject to intermittent faults that may raise alarms in the system. The invention focuses on an optical network based on the Any rate architecture. A...
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7389045 |
Apparatus and method for monitoring and compensating an optical signal
Optical communication apparatuses and optical communication methods are provided. According to one aspect, an optical communication apparatus includes a communication path configured to communicate...
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7376350 |
Methods and apparatus for optical network management using pilot tones
Methods and apparatus for managing an optical network using pilot tones are provided. One method includes selecting an optical path having a plurality of nodes from a database defining an expected...
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7369763 |
Apparatus and method for monitoring an optical transmission line
An apparatus and a method for monitoring an optical transmission line. An optical pilot signal of a predetermined duration is transmitted along said optical transmission line and a return signal is...
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7356261 |
Optical wireless communications system
An optical wireless communications system has a first optical wireless communications apparatus for transmitting a pilot beam and a second optical wireless communications apparatus for receiving...
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7346279 |
Optical transceiver using heterodyne detection and a transmitted reference clock
A heterodyne communication system uses coherent data modulation that is resistant to phase noise. In particular, a pilot tone and reference clock signal are transmitted along with the modulated...
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7336903 |
Optical wireless transmission apparatus
There is disclosed an optical wireless transmission apparatus in which a pilot light emitting section of a receiving/emitting section sends a pilot light in a wavelength region of 930 nm to 960 nm...
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7321728 |
Optical waveform for use in a DWDM optical network and systems for generating and processing same
An optical signal occupying one or more wavelengths. An optical data signal on each wavelength is modulated with a respective overhead (dither) signal, resulting in a respective dithered optical...
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7321730 |
Method and apparatus for the transmission fault detection in an access network
An optical network unit (ONU) interconnected by passive optical network (PON) equipment to an optical line terminal (OLT) is identified using secondary modulation of the optical carrier to impress...
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7313326 |
Method to inject pilot tone into microcontroller-supervised DWDM transmitters
The power of a digital signal such as an optical data stream is set via digital-to-analog converter having a reference input for connection to a DC reference signal. The pilot tone is injected into...
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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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7302178 |
System and method for measuring power of optical signals carried over a fiber optic link
A pilot tone generator receives optical energy from an optical communication medium carrying a plurality of optical signals. Each optical signal carries data modulated at a unique wavelength and...
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7274872 |
System and method for subcarrier modulation as supervisory channel
An apparatus and method for processing a supervisory signal for optical network applications. The apparatus includes a subcarrier transmission system configured to receive a first supervisory...
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7272308 |
Method of WDM channel tagging and monitoring, and apparatus
Provided is an optical apparatus and method wherein power transfer coefficients arising from SRS are measured at a designated co-location point and the power of dithers, which are impressed on the...
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7263287 |
Method and apparatus for assessing performance of optical systems
An apparatus for accelerating assessment of an optical transmission system using Bit Error Rate (BER) tests calculates Q-factors for at least two different extinction ratios from measured test BER...
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7248798 |
Method and system for identification of channels in an optical network
A method and system for identification of a channel in an optical network is provided. The channel is identified by the use of unique combinations of two or more low frequencies, or tones,...
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7242863 |
Method and system for coordinating and utilizing channel power information in an optical communications network
A method of coordinating channel power information in a wavelength division multiplexed (WDM) optical communication system is disclosed. The method determines weighting values for each channel of...
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7231146 |
Optical communication system
Communicating a signal includes receiving the signal at a primary device of a switching system, where the primary device is associated with a primary path along which the signal is propagating. A...
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7190897 |
Optical channel operating parameters monitoring
In a communication system, channel operating parameter carrier frequencies are located in the vicinity of data nulls in a data spectrum. The operating parameter carriers are summed with the data...
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7187862 |
Method of locating faults in optical telecommunication networks
A method, a system and a module are proposed for detecting and locating faults in an optical multi channel network composed of network nodes. The method includes assigning different sub-carrier...
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7184660 |
Method and system for monitoring performance of optical network
The invention describes methods and systems for monitoring the performance of an optical network by marking a group of optical signals with a set of identification tags which are unique to network...
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7174097 |
Method and an apparatus for signal transmission
A method and apparatus for transmitting a plurality of signals having different wavelengths through a length of optical cable which is caused to provide distributed gain by being subjected to Raman...
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7174108 |
Transmission device and repeater
A transmission system is provided that recognizes occurrence of a fault efficiently so that the workability and quality of service can be improved. An optical amplifier part amplifies an optical...
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7158723 |
Channel identification in communications networks
Channels in an optical WDM network are each identified by at least two dither tones with which the channel is modulated, the dither tones alternating with a predetermined periodicity so that at any...
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7151897 |
Optical clock phase-locked loop circuit
This optical clock phase-locked loop circuit includes an oscillator 12 , an optical coupler 2 , an optical cross-correlation detection device 3 that outputs light containing the correlating...
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7142783 |
Method and system for identification of channels in an optical network
A method and system for identification of a channel in an optical network is provided. The channel is identified by the use of unique combinations of two or more low frequencies, or tones,...
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7139486 |
Method and apparatus for optical add/drop multiplexing in optical networks
An optical add/drop multiplexing (OADM) apparatus and method are disclosed for detecting pilot tones, removing ghost tones, and re-inserting pilot tones on WDM signals in an optical network. The...
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7139476 |
Distributed fiber sensor with detection and signal processing using polarization state management
Polarization effects are managed to provide differential timing information for localizing disturbances affecting two or more counter-propagating light signals on one or more optical waveguides...
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7130544 |
Optical repeating system and optical amplifying repeater control method
An optical repeating system includes an optical transmitter and an optical amplifying repeater. The optical transmitter transmits a supervisory command and a control command to the optical...
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7127165 |
Method and system for compensating for side effects of cross gain modulation in amplified optical networks
A method and system for compensating for side effects of cross gain modulation in amplified optical networks, which allows reliable identification of expected and unexpected channels in the network...
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7127182 |
Efficient optical transmission system
A transmitter for optical communication systems includes a source of optical radiation, a source of complex non-information signals, and a modulator unit in communication with the source of optical...
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7123832 |
Methods and apparatus for optical network management using pilot tones
Methods and apparatus for managing an optical network using pilot tones are provided. One method includes generating a list of pilot tones contributed by a selected node to each of its target...
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7120358 |
Optical packet routing network system based on optical label switching technique
An optical communication equipment comprises shared optical sources 88 a– 88 d to be shared by communication nodes 100 a– 100 d , the wavelengths of optical signals 76 a– 76 d are...
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7113705 |
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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7110673 |
Optical communication system
In networks carrying existing optical traffic on one wavelength band in combination with wavelength division multiplexed traffic carried on a second wavelength band, there is a need to enable...
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7062166 |
First and second derivative processing of wavelength multiplexed optical signals
A system and method for optimizing performance characteristics of optical networks. The system and method exploits a wavelength-locked loop servo-control circuit and methodology that enables real...
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