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|| List of recent Optical Ofdm-related patents
|Low cost direct modulation and coherent detection optical ofdm|
System and method for compensating distortions introduced by an optical channel and by at least one directly modulated transmitting laser that transmits a modulated optical signal that carries data to a receiving end over the optical channel. At the receiving end, the transmitted signal is received by a coherent receiver that processes the received signal by compensating the distortions introduced by the optical channel by applying, on the received signal, an operator being capable of essentially compensating for all fiber distortions in the optical channel; compensating the non-linear phase distortions and/or statistical phase distortions introduced by the directly modulated transmitting laser by applying, on the processed signal obtained after compensating the fiber distortion, a non-linear operator being the extraction of the absolute value of the compensated signal; and extracting the data carried by the processed signal, from the absolute value of the processed signal obtained after compensating the non-linear phase distortions and/or statistical phase distortions, thereby demodulating the processed signal..
|Optical frequency shifter and optical modulator using the same|
An object of the present invention is to provide a temperature-independent optical frequency shifter for generating sub-carriers with a miniaturizable configuration, as well as to provide an all-optical ofdm modulator using the same that is compact, has low temperature dependence, and is even compatible with different frequency grids. Provided is an optical frequency shifter and an optical modulator using the same, the optical frequency shifter comprises one input optical port, a 1-input, 2-output optical coupler optically connected thereto, two mach-zehnder modulation units individually optically connected to the two outputs thereof, a 2-input, 2-output optical coupler optically connected to the individual outputs thereof, and two output optical ports optically connected to the outputs thereof, wherein the two mach-zehnder modulation units are driven by periodic waveforms at the same frequency whose phases differ from each other by (2p+1) π/2 (p: integer)..
|Optical communication system, optical transmitter, and transponder|
A technique for reducing a necessary bandwidth of an optical receiver in an optical ofdm communication system is disclosed. Optical ofdm signals of different spectra are alternately transmitted for each ofdm symbol time, and; after this light is transmitted via an optical fiber, the light undergoes photoelectric conversion by a delay interferometer having a delay time equal to one symbol time and a balanced direct detection receiver and is received..
|Optical orthogonal frequency division multiple multiplexing receiver and optical signal receiving method thereof|
Provided is an optical ofdm receiver. The optical ofdm receiver receives an optical signal dependent on the nonlinearity of a transmitter.
|Optical communication system, transmission apparatus and reception apparatus, and transmission method and reception method|
An optical communication system, a transmission apparatus and a reception apparatus, and a transmission method and a reception method are provided. The transmission apparatus transmits an optical signal, and comprises: at least one encoder for encoding at least one data signal, respectively; at least one first modulator for performing first modulation on the at least one encoded data signal, respectively, and generating at least one first modulated signal; at least one second modulator for performing second modulation, which is dft-spread-ofdm modulation, on the at least one first modulated signal, respectively, and generating at least one second modulated signal; and an up-converter for up-converting the at least one second modulated signal into the optical signal to be transmitted.
|Orthogonal frequency division multiple access time division multiple access-passive optical networks ofdma tdma pon architecture for 4g and beyond mobile backhaul|
Systems and methods are provided for network communication using wireless base stations and an optical orthogonal frequency division multiple access (ofdma) signal generated on an optical wavelength, with the optical ofdma signal being composed of a plurality of ofdma subcarriers. A multi-level modulator modulates each of the plurality of ofdma subcarriers.
|Wired/wireless converged mac adaptor and method of transmitting frame using wired/wireless converged mac adaptor|
A wired/wireless converged media access control (mac) adaptor and a method for transmitting a frame using the same. The wired/wireless converged mac adaptor may include a service network interface (sni) to transmit a mac frame corresponding to a wired or wireless service, or common public radio interface (cpri) data, a frame conversion unit to convert, into an orthogonal frequency division multiplexing (ofdm) frame, a wired/wireless converged mac frame having a common frame structure of the mac frame corresponding to the wired or wireless service or the cpri data, and an ofdm interface configured to transmit the ofdm frame to an optical ofdm modem by dynamically allocating sub-carriers based on data transmission characteristics..
|Compact tunable optical ofdm source|
An optical transmitter includes first and second optical single sideband modulators. The first optical single sideband modulator is configured to receive an input optical signal and produce a first frequency-shifted optical signal.
|Optical communication system, optical receiver, optical transponder, wavelength multiplexing optical communication system, wavelength multiplexing receiving device, and wavelength multiplexing optical transponder|
To reduce papr in an optical ofdm communication system, light is phase-modulated by a base-band ofdm signal which is the output of a transmission signal processing unit 100 provided in an inner section of an optical receiver. When optical communication is implemented with the light as signal light, papr of low level of almost 0 db can be achieved at places in an inner section of an optical fiber wherein the optical power is large.
|Variable rate optical transmitter based on all-optical ofdm super-channel technology|
The present invention is directed to a method including determining an appropriate power level for a phase modulator for an optimum number of subcarriers; and applying the determined appropriate power level via a controller to produce the optimum number of subcarriers, wherein the optimum number of subcarriers enables an optical-orthogonal frequency division multiplex o-ofdm based variable rate transmitter with automatic control by a controller to produce an optimum setting based on a required rate.. .
|Method and device for inserting/extracting optical subband into multiband optical ofdm signal|
A device for inserting/extracting at least one optical subband into an optical channel consisting of a plurality of optical subbands. The device includes an extraction means that is capable of extracting a first optical subband belonging to the optical channel, a suppression means that is arranged so as to obtain a filtered optical channel from the optical channel wherein at least one second subband is suppressed, and a coupling means that is capable of inserting a replacement optical subband in place of the second subband in the filtered optical channel so as to obtain a modified optical channel.
|Flexible multi-band multi-traffic optical ofdm network|
In accordance with some embodiments of the present disclosure a method for receiving and processing an optical orthogonal frequency-division multiplexed signal containing a plurality of traffics comprises receiving the optical orthogonal frequency-division multiplexed signal. The method further comprises down-converting the optical orthogonal frequency-division multiplexed signal into the electrical domain to obtain an electrical signal; filtering the electrical signal to obtain a first portion of the electrical signal containing a first of the plurality of traffics and preprocessing the first portion of the electrical signal in a first parallel preprocessor; filtering the electrical signal to obtain a second portion of the electrical signal containing a second of the plurality of traffics and preprocessing the second portion of the electrical signal in a second parallel preprocessor; and combining the preprocessed first and second portions of the electrical signal to yield a combined electrical signal and demodulating the combined electrical signal..
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Optical Ofdm topics: Optical Ofdm, Optical Communication System, Communication System, Multiplexing, Transmitter, Electrical Signal, Frequency Division Multiple Access, Base Station, Access Time, Network Communication, Coded Data, Modulation, Media Access Control, Access Control, Frequency Division Multiplexing
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