The embodiments of the present invention relate to a wireless fronthaul passive optical network (PON) system, an optical network device and a method. An OLT performs wireless compatibility processing on data received from a CPRI interface of a BBU and then divides the data into a data part and a control word part, which two parts can be processed respectively, such that the data part can be compressed as far as possible to reduce the fronthaul bandwidth, thereby increasing the transmission efficiency.

Wireless fronthaul passive optical network (PON) system, optical network device and method

The invention provides a downlink energy-saving transmission system of an OFDM (Orthogonal Frequency Division Multiplexing) PON (Passive Optical Network) The downlink energy-saving transmission system comprises an optical line terminal, a feeder line type optical fiber and a PON system, wherein the PON system comprises a remote node, a distributed optical fiber and optical network units, the optical line terminal is connected to the remote node through the feeder line type optical fiber, and the remote node is connected to each optical network unit through the distributed optical fiber According to the downlink energy-saving transmission system provided by the invention, a timer module is added in a traditional optical network unit for controlling the switch-off time of an ADC (Analog to Digital Converter), and a selective sampling function of the ADC in each optical network unit can be directly realized in a physical layer under the scheduling and the managing without media access control; meanwhile, other follow-up digital signal processing modules can also be switched off during a switch-off process of the ADCs, and the power consumption of each optical network unit can be further reduced

Downlink energy-saving transmission system of OFDM (Orthogonal Frequency Division Multiplexing) PON (Passive Optical Network)

The invention relates to an optical fiber communication method and an optical fiber communication device based on LED (light emitting diode) pulses. The device comprises a modulation transmitting unit and a demodulation receiving unit, wherein the modulation transmitting unit comprises a serial inputting end unit, a nine-bit coding unit, a multi-channel secondary carrier wave code mapping unit, a carrier wave combining unit and a modulation transmitting unit body which are sequentially connected to one another; and the demodulation receiving unit comprises a receiving unit, a band-pass filter, a multi-channel secondary carrier wave code mapping unit, a nine-bit decoding unit and a serial outputting unit which are sequentially connected to one another. By the optical fiber communication method and the optical fiber communication device based on the LED pulses, high-speed, low-power-consumption and safe isolated communication transmission can be carried out between high-voltage electric primary equipment and low-voltage electric secondary equipment of the existing high-voltage monitoring equipment.

Optical fiber communication method and optical fiber communication device based on LED (light emitting diode) pulses

The embodiment of the invention discloses a signal transmission method of a passive optical network system, which is used for solving the problem of difficult wavelength management and reducing the device cost. The method comprises the following steps: an optical line terminal (OLT) generates downlink frequency division multiplexing electric signals corresponding to a plurality of downlink sub-bands, each downlink sub-band in the plurality of downlink sub-bands is not overlapped on a frequency domain, and each downlink sub-band corresponds to a group of optical network units (ONU); the OLT loads the downlink frequency division multiplexing electric signal to OLT emission light to obtain a downlink frequency division multiplexing optical signal; and the OLT sends the downlink frequency division multiplexing optical signal, so that the ONU of which the frequency of the ONU intrinsic light is a first frequency obtains a downlink sub-band signal corresponding to the ONU from the downlink frequency division multiplexing optical signal, and the first frequency corresponds to one downlink sub-band in the plurality of downlink sub-bands.

Signal transmission method of passive optical network system and related equipment

Provided are a passive optical network communication method and system, and an optical line terminal. The system comprises an OLT, an ODN and an ONU. The OLT is used for generating wide-spectrum light and downlink light, forming a downlink signal by the downlink light carrying downlink data on which orthogonal frequency division multiplexing modulation is performed and is to be sent to at least one optical network unit; the ODN is used for dividing the wide-spectrum light into at least one light wave respectively corresponding to the at least one optical network unit, and sending the at least one light wave and the downlink signal to at least one corresponding optical network unit respectively. The at least one optical network unit is used for receiving the downlink signal, and performing orthogonal frequency division multiplexing demodulation on the downlink signal to obtain downlink data; and carrying uplink data, on which orthogonal frequency division multiplexing modulation is performed and is to be sent to an optical line terminal, on a light wave received from a light distribution network to form an uplink signal, and sending the uplink signal to the light distribution network. The present invention realizes having each ONU working at different emission wavelengths with a low cost.

Passive optical network communication method and system, and optical line terminal

The invention provides a passive optical communication method, a system, and an optical line terminal. The system comprises an OLT, an ODN, and an ONU. The OLT can be used to generate the wide band light and the downstream light. The downstream light can be used to send the downstream signal generated by the downstream data of the orthogonal frequency division multiplexing to at least one optical network unit. The ODN can be used to divide the wide band light into at least one optical wave corresponding to at least one optical network unit, and can be used to send at least one optical wave and the downstream signal to the at least one corresponding optical network unit correspondingly. At least one optical network unit can be used to receive the downstream signal, and the downstream data can be acquired by the orthogonal frequency division multiplexing of the downstream signal. The upstream data, which are waiting to be sent to the optical line terminal, after the orthogonal frequency division multiplexing can be used to carry the upstream signal generated by the optical wave received by the optical distribution network, and the upstream signal can be sent to the optical distribution network. According to the invention, each ONU can work in different transmission wave lengths with low costs.

Passive optical communication method, system, and optical line terminal

Provided is a method for transmitting a signal, which can lower the sampling rate requirements of a digital-to-analogue converter at low costs so as to reduce the costs of communication devices and network construction. The method comprises: acquiring, by a sending end, a target digital signal required to be sent to a receiving end; determining, by the sending end, a target DAC corresponding to a target frequency band from the at least two DACs, wherein the target frequency band is a frequency band used by the sending end and the receiving end to communicate, and the target frequency band belongs to a characteristic Nyquist domain corresponding to the target DAC; processing, by the sending end, the target digital signal via the target DAC so as to generate a target analogue signal; and sending, by the sending end, the target analogue signal to the receiving end through the target frequency band.

Method, apparatus and system for transmitting signal

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Passive optical communication method, system, and optical line terminal

Passive optical network communication method and system, and optical line terminal

Method, apparatus and system for transmitting signal