Wuhan Research Institute of Posts and Telecommunications

Wuhan Fiberhome Networks Co. Ltd.

Shaohua Yu

Qi Yang

Zhu Yang

Lei Wang

Miaofeng Li

Daigao Chen

Xi Xiao

Cai Li

Tao Zeng

Ivan B Djordjevic

Lei Liu

Ying Qiu

Wu Liu

William Shieh

Zhixue He

Xiaoyin Zhang

Shanhong You

Gangxiang Shen

Rong Hu

A polarization converter based on taking a high-order TE mode as a transition mode comprises a ridge waveguide () and a slab waveguide () that are arranged in double layers and varying in width, and a strip waveguide () which is varying in width. The ridge waveguide () is disposed on the upper end face of the slab waveguide (), and is aligned with two ends of the slab waveguide (). The right end of the ridge waveguide () and the slab waveguide () are connected with the strip waveguide () with the varying width. A TMmode enters from the left ends of the ridge waveguide and the slab waveguide, and is converted into a TEmode for output. On the contrary, the TEmode enters from the right end of the strip waveguide and is converted into the TMmode for output.

Polarization converter based on taking high-order TE mode as transition mode

The present invention discloses a GSG track-type radio-frequency electrode, a silicon-based traveling-wave electrode light modulator, and a preparation method, and relates to the field of high-speed electro-optical chips. The GSG track-type radio-frequency electrode includes a GSG-type planar electrode, where a track electrode used for delaying an electric field is periodically added to one side or dual sides of the GSG-type planar electrode, and the track electrode is connected to a ground electrode of the GSG-type planar electrode. The silicon-based traveling-wave electrode light modulator includes the GSG track-type radio-frequency electrode and a conventional silicon-based traveling-wave electrode light modulator, and the GSG track-type radio-frequency electrode is connected to an active region of the silicon-based traveling-wave electrode light modulator by using through holes between electrode layers. The present invention can improve parameter design freedom of an electrode and realize effective signal parameter matching.

GSG track-type radio-frequency electrode, silicon-based traveling-wave electrode light modulator, and preparation method

The present disclosure relates to a dual-channel orthogonal carriers assisted optical signal transmitting device, and a direct detection method and a direct detection system using the dual-channel orthogonal carriers assisted optical signal. The direct detection system using the dual-channel orthogonal carriers assisted optical signal comprises a transmitting device and a receiving device. The transmitting device is configured to generate and transmit a dual-channel orthogonal carriers assisted optical signal to be detected, wherein the dual-channel orthogonal carriers assisted optical signal is modulated with a modulation signal. The receiving device is configured to receive the dual-channel orthogonal carriers assisted optical signal, and recover amplitude and phase information of the modulation signal based on the dual-channel orthogonal carriers assisted optical signal.

Dual-channel orthogonal carriers assisted optical signal transmitting device, direct detection method and system

A transmitting system, a receiving system, a transmitting method and a receiving method capable of implementing communications with multiple rates are described. The transmitting system comprises: a transmitting-side selection apparatus for selectively inputting input bit data to one of a first constellation mapping modulation apparatus and a second constellation mapping modulation apparatus based on a rate to be transmitted; the first constellation mapping modulation apparatus for performing a first constellation mapping modulation on the signal input thereto based on a selection made by the transmitting-side selection apparatus, so as to obtain a constellation-mapped signal; the second constellation mapping modulation apparatus for performing a second constellation mapping modulation on the signal input thereto based on the selection made by the transmitting-side selection apparatus, so as to obtain a constellation-mapped signal; and an OFDM modulation apparatus for performing an OFDM modulation on the constellation-mapped signal to obtain an OFDM-modulated signal for transmission.

Transmitting system and receiving system, and transmitting method and receiving method

A transmitting device, a receiving device, an optical communication system, and associated methods are provided. The transmitting device transmits an optical signal containing data, and comprises: an optical tone generator for generating at least one optical tone; at least one encoder for performing advanced coding on at least one data signal respectively, each of the at least one data signal carrying a part of the data; at least one mapper for performing high order modulation on the at least one coded data signal; and an up-converter for up-converting the at least one high-order-modulated data signal into the optical signal to be outputted through the at least optical tone. Thereby, high speed (e.g., over 1-Tb/s) transmission per single channel over a long-haul distance (e.g. over 1000-km) with error-free recovery may be achieved.

Optical communication system, device and method employing advanced coding and high modulation order

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. Thus, a PAPR of the optical OFDM transmission signal is decreased, a signal distortion caused by non-linearity of optical devices is reduced, and a reception quality of the signal is improved.

Optical communication system, transmission apparatus and reception apparatus, and transmission method and reception method

A bias voltage control system and method for an optical IQ modulator are disclosed. The optical IQ modulator includes an I-branch Mach-Zehnder Modulator (MZM) to which an I-branch bias voltage is applied, a Q-branch MZM to which a Q-branch bias voltage is applied, and an optical phase shifter to which an orthogonal bias voltage is applied. The system comprises a photo-detector converting at least a part of an optical signal output by the optical IQ modulator to an electrical signal; an analog-to-digital converter converting the electrical signal to a digital signal; and a digital signal processor superimposing a first dither signal and a second dither signal on the I-branch bias voltage and the Q-branch bias voltage respectively to generate a first order harmonic signal and a second order harmonic signal, and controlling the bias voltages according to powers of a DC component, and the first and second order harmonic signals.

Bias voltage control system and bias voltage control method

A reconfigurable optical add/drop multiplexer and a reconfigurable optical add/drop multiplexing method are provided. The reconfigurable optical add/drop multiplexer comprises: an optical processing unit for receiving a first optical signal containing a plurality of optical channels, processing the first optical signal to generate a second optical signal which is a part of the first optical signal, and outputting the second optical signal; and a coherent detection unit for performing a coherent detection on the second optical signal so as to separate from the second optical signal an optical channel contained therein, and outputting the optical channel. With the reconfigurable optical add/drop multiplexer and the reconfigurable optical add/drop multiplexing method, any number of degrees can be supported, and adding/dropping of an optical channel with any wavelength and any bandwidth to/from any direction can be achieved, so that requirements of being colorless, directionless, contentionless and gridless can be satisfied.

Reconfigurable optical add/drop multiplexer and reconfigurable optical add/drop multiplexing method

A modulation device and method, and a demodulation device and method are provided. The modulation device modulates plural baseband signals to generate an optical signal, and comprises: plural modulation units for modulating plural electrical carriers with different frequencies by using the baseband signals respectively, to generate corresponding electrical modulated signals; a synthesizer for synthesizing the electrical modulated signals to generate a single electrical synthesized signal; an optical modulation unit for modulating a single optical carrier by using the electrical synthesized signal to generate the optical signal, wherein signal components corresponding to the baseband signals in the optical signal are distributed on both sides of a carrier frequency of the optical carrier at a predetermined frequency interval. Thus, processing on a high-speed baseband signal may be divided into processing on multiple relatively low-speed baseband signals, overcoming a bottleneck caused by sampling rates of a digital-analog converter and an analog-digital converter.

Modulation device and modulation method, and demodulation device and demodulation method

A deep packet inspection and control device for performing real-time traffic management on a real-time packet data stream over the internet that includes a first rule table unit for storing a rule table including a first set of rule entries which are pre-defined or generated dynamically; a first scanning unit for receiving a first real-time packet data stream from the internet, and scanning the first real-time packet data stream according to a scanning window defined by the first set of rule entries; a first analysis unit for matching the first real-time packet data stream with the first set of rule entries in the scanning window of the first scanning unit, and outputting a matching result; and a first rule linkage unit for performing linkage control on the first real-time packet data stream to be output back to the internet according to the matching result output from the first analysis unit.

Internet real-time deep packet inspection and control device and method

A signal transmission and reception device and method are provided. The transmission method comprises generating multiple optical carriers from a basic optical carrier; modulating optical carriers, except for a predetermined optical carrier, in the optical carriers by using multiple data signals respectively, to generate multiple optical modulated signals; and synthesizing the multiple optical modulated signals and the predetermined optical carrier into a single optical signal, and transmitting the signal. The reception method comprises separating an optical signal into multiple optical carriers, the optical carriers having different frequencies and including a predetermined optical carrier; generating from the predetermined optical carrier multiple optical waves, frequencies of which correspond to frequencies of optical carriers, except for the predetermined optical carrier, in the multiple optical carriers; and demodulating the optical carriers, except for the predetermined optical carrier, in the multiple optical carriers by using the multiple optical waves respectively.

Signal transmission and reception device and method

A deep packet inspection and control device includes a first rule table unit for storing a rule table including a first set of rule entries which are pre-defined or generated dynamically; a first scanning unit for receiving a first real-time packet data stream from the internet, and scanning the first real-time packet data stream according to a scanning window defined by the first set of rule entries; a first analysis unit for matching the first real-time packet data stream with the first set of rule entries in the scanning window of the first scanning unit, and outputting a matching result; and a first rule linkage unit for performing linkage control on the first real-time packet data stream to be output back to the internet according to the matching result output from the first analysis unit.

A data transmission apparatus used in a multiple service ring includes at least two nodes coupled to at least one aggregate pipe and at least one tributary. The data transmission apparatus includes a tributary RX framer coupled to a tributary for deframing data frames received from the tributary and extracting a destination node address and a TX framer for encapsulating the destination node address and the data received from the tributary into frames of the multiple service ring and transmitting the same along an aggregate pipe to a downstream neighbor node in the ring. The data transmission apparatus also includes a RX framer for receiving and deframing data frames of the multiple service ring from a upstream neighbor node to obtain at least a destination node address and actual data, a filter for determining data frames for local node according to the destination node address, and a tributary TX framer for encapsulating the data frames for local node into tributary data frames and sending the tributary data frames to a corresponding tributary.

Multiple service ring of N-ringlet structure based on multiple FE, GE and 10GE

A data transmission apparatus for implementing multiple service flow in a multiple service ring is described. The apparatus includes a trunk pipe and at least two nodes each with at least one flow. The apparatus also includes a flow Rx framer for converting data received from the flow into data packets of a predetermined protocol, a transmission setup device for setting up information for packets of the predetermined protocol to be transmitted, and a Tx framer for encapsulating the information into frames of the MSR and transmitting the same along the trunk pipe to a downstream neighbor node along the ring.

Implementation method on multi-service flow over RPR and apparatus therefor

A data transmission apparatus used in a multiple service ring is described. The apparatus includes at least two nodes coupled to at least one aggregate pipe and at least one tributary. The apparatus also includes a tributary TX framer for converting data received from the tributary, a transmission setup module for setting up information for processing protocol packets to be transmitted, a TX framer for encapsulating the information into frames of the MSR and transmitting the same along the aggregate pipe to a downstream neighbor node in the ring, and a RX framer for receiving and deframing data frames of the MSR from a upstream neighbor node. The apparatus also includes a transiting module for transiting the frames to the TX framer, a destination tributary determining module for determining a destination tributary, and a tributary RX framer for converting and sending protocol packets to a corresponding tributary.

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Wuhan, China

Shaohua Yu