45 results about "10G-EPON" patented technology

The invention discloses a 10G single-fiber bidirectional optical module, which comprises a burst laser driver, a burst light power indicator, a microcontroller, a single-fiber bidirectional optical device, an avalanche photoelectric diode bias control circuit, a limiting amplifier, a receiving end light power monitor and an SFP+ connector, wherein the microcontroller is mainly used for controlling the burst laser driver and the limiting amplifier; the single-fiber bidirectional optical device is connected between the burst laser driver and the limiting amplifier to realize conversion between electrical signals and light signals; and the avalanche photoelectric diode bias control circuit supplies a high bias voltage to a receiving end avalanche photoelectric diode and performs voltage compensation on the receiving end avalanche photoelectric diode according to the temperature property. The 10G single-fiber bidirectional optical module has the advantages of low design cost, simple circuit design and capability of meeting the requirement of a 10G EPON ONU symmetrical scheme.

The invention discloses a method and device for rapid protection switching of passive optical network (PON) ports in any slot position in a 10 Gbit / s Ethernet PON (10G-EPON) system. The method comprises the following steps: a plurality of PON service protection switching groups formed by two identical PON service cards are arranged on an optical line terminal (OLT); any PON port on one PON service card and any PON port on the other PON service card in each PON service protection switching group are configured as main and standby PON ports respectively; and complex programmable logic devices (CPLDs) on the PON service cards respectively detect the working condition of each autonomous PON port in real time, close optical modules on the main PON ports and notify the other PON service card of enabling the optical modules on the corresponding standby PON ports via protection switching data frames when lost of synchronous (LOS) signals on one or more main PON ports are detected on one PON service card. In the invention, the CPLDs are adopted to detect and judge the switching conditions and control switching, thus avoiding the problem of long switching time caused by using software for treatment and effectively ensuring rapid recovery of services when a single disk or main optical fiber has a fault.

The invention discloses an optical receiver which comprises a receiving unit, a converting unit, a detecting unit and a burst clock data recovering circuit, wherein the receiving unit is used for receiving optical signals which at least comprise optical signals having two different transmission rates; the converting unit is used for converting the received optical signals to voltage signals; the detecting unit is used for detecting the transmission rates of the voltage signals and outputting control signals according to the detecting result; and the burst clock data recovering circuit is usedfor recovering the clock and the data for the voltage signals according to the control signals. Correspondingly, the invention also discloses a method for receiving optical signals. By the invention,not only time multiplexing signals with two rates of GEPON and 10G EPON can be received, but also fast synchronization and time saving can be realized.

The invention discloses a timing device and method for automatically capturing a 10G EPON (10 Giga Ethernet Passive Optical Network) message and relates to the field of communication. The timing method comprises the following steps: after starting the automatic capturing, counting for a preset time by an absolute clock subjected to time correction of a user / OLT (Optical Line Terminal) / ONU (Optical Network Unit) under an absolute timing capturing mode; starting the 10G EPON message capturing and writing into a capturing cache according to screening conditions; under a relative timing capturing mode, detecting a frame content and a frame state captured by specific starting; starting to count by a timing clock till reaching the time preset by the user; and starting a packet grabbing process and writing into the capturing cache according to screening conditions. According to the timing method provided by the invention, the 10G EPON message can be automatically and accurately captured and analyzed; the space for storing the captured message is reduced by designing accurate timing and filtering conditions; the performance and the use efficiency of a remote dispatcher are promoted; and the intercommunication capacity of different equipment factories is enhanced.

The invention discloses a capturing circuit and a writing control method of 10G EPON (10 Giga Ethernet Passive Optical Network) messages. The writing control method comprises the following steps: receiving EPON messages interacting among 10G EPON OLT (Optical Line Terminal) and ONU (Optical Network Unit) through an optical module and a 10G SERDES (Serializer / Deserializer); combining and triggering message capturing according to set conditions after the decoding at a PCS (Physical Coding Sub-layer); writing the captured message into capturing cache, wherein the steps and formats for storing the capturing frames are as follows: writing 128bit frame data at an even number clock period while a frame envelope is valid; and writing the frame head byte number, the frame end byte number, the reaching time, the frame error indication, CRC (Cyclic Redundancy Check) verification error indication and frame boundary symbol of the frame within a clock period at the frame end. With the adoption of the capturing circuit and the writing control method, continuous EPON messages of 10 G can be captured and analyzed rapidly and precisely; the storage space of the captured message is reduced through specific triggering and screening conditions; the performance and the use efficiency of the remote scheduling are improved; and the inter-compatibility of factories of different equipment is enhanced.

The invention discloses a single-fiber four-way symmetrical optical module, which belongs to the technical field of optical communication. The optical module comprises a connector, an optical interface, an optical module transmitting end part and an optical module receiving end part, wherein the optical module transmitting end part comprises a 10G equalizer / clock data recovery unit, a 10G laser driving unit, a 10G laser, a 1G laser driving unit, a 1G laser, a wavelength division multiplexing unit and a transmitting end microcontroller; and the optical module receiving end part comprises an avalanche photodiode, a burst mode transimpedance amplifier, a burst mode limiter amplifier, a 1:2 clock fan-out buffer unit, a level shift unit, a booster circuit and a receiving end microcontroller. According to the single-fiber four-way symmetrical optical module, the bottleneck problem of the uplink bandwidth of an Ethernet passive optical network (EPON) system can be solved, the symmetrical rate of a gigabit Ethernet passive optical network optical line terminal (GEPON OLT) is supported, the symmetrical rate and the unsymmetrical rate of 10G EPON OLT can be also supported, a system can be kept to smoothly transit and upgrade, and the system upgrading cost of operators can be effectively lowered.

The invention relates to a method to discover Optical Network Units (ONU) with different speed capabilities in an Ethernet Passive Optical Network (EPON) by an Optical Line Termination (OLT), where logical links in the network are identified by Logical Link IDs, and the OLT can transmit and receive data with lGbit / s-speed (IG) and 10 Gbit / s-speed (10G), and the discovery process is handled in the OLT by a Multi Point Con not trol Process (MPCP), which exchanges messages as Data Units (MPCPDU) with the ONUs. This is achieved by extending the standard MPCPDUs in a way, that backward compatability is as- sured.

A method of signaling and detecting end-of-transmission on a data communications link that uses scrambling comprises, by a transmitting node of the network, appending an end of burst delimiter (EBD) binary sequence to burst data and transmitting the burst data and the EBD over the communication link to a headend of the network. In a 10 G EPON using a 64B / 66B transmission code, the EBD is exemplarily a 198 bit pattern.

The invention discloses a method for judging the optimal working voltage of an APD (Avalanche Photo Diode) of a 10G EPON (Ethernet Passive Optical Network). The method comprises the following steps that: S1: according to the testing data of a BOSA or RSSI (Received Signal Strength Indicator) under a dark condition, obtaining the reverse breakdown voltage Vbr of the APD; S2: setting initial value working bias voltage, selecting fixed input light power, according to preset time of duration, testing a current error code rate or an error code number, then, carrying out stepping increasing on the working bias voltage by a set stepping value to repeatedly test at least three points until the error code rate or the error code number is increased; S3: taking the working bias voltage x and the error code rate y to solve a quadratic equation of one unknown y=ax2+bx+c to obtain three coefficients a, b and c; S4: according to the three obtained coefficients a, b and c, calculating an extreme valuex=-b / 2a, and obtaining a corresponding APD DAC (Digital to Analog Convertor); and S5: utilizing the APD DAC value to carry out sensitivity testing, if the sensitivity testing is qualified, carrying out subtraction and translation on the APD DAC of the current temperature and an APD DAC LUK table to be updated into the APD DAC LUK, and if the sensitivity testing is unqualified, failing.

The invention provides a data transmission method, OLT (optical line terminal) and system in a 10G EPON (Ethernet Passive Optical Network), belonging to the photo-communication field. The method comprises the following steps of: detecting the link circuit quality between ONUs (Optical Network Unit); determining a length of a data block according to the detection result and determining a parameter of RS (Reed-Solomon) encryption algorithm according to the length of a data block; performing FEC (Forward Error Correction) encoding to down link circuit by RS encryption algorithm and transmitting to the OUNs. The OLT comprises a detecting module, an encoding module and a transmitting module. The system comprises the OLT and OUN. The invention enables the FEC encoding to become a selectable processing process and improves the bandwidth efficiency.

The embodiment of the invention provides a 10G Ethernet passive optical network (EPON) uplink transmission method, 10G EPON uplink transmission equipment and a 10G EPON uplink transmission system. The method comprises the following steps of: receiving a first uplink optical signal and a second uplink optical signal transmitted by a wavelength division multiplexer (WDM), wherein the first uplink optical signal and the second uplink optical signal are provided by a first optical network unit for supporting a first uplink rate and a second optical network unit for supporting a second uplink rate respectively, and the first optical network unit and the second optical network unit correspond to different wavelengths respectively; performing wavelength detection on the second optical signal to judge whether the second optical network unit and the first optical network unit have wavelength conflict; and if the wavelength conflict is detected, inhibiting the second optical network unit to send uplink optical signals. According to the embodiment, uplink transmission is performed in the 10G EPON through the WDM so as to realize 10G high bandwidth transmission.

The invention discloses a method, a system and a device realizing message transmission in the Ethernet passive optical network (EPON). The method is as follows: a 10 G optical line terminal (OLT) is additionally arranged in the EPON to be used as a transit station of a 10 G EPON optical network unit (ONU) and a 1G EPON OLT transit station to recognize the up message directly coming from a 10 G EPON ONU, judge whether the up message is the multiple-point control protocol (MPCP) message, and only transmit the MPCP message to a 1G EPON OLT. The system comprises an original EPON OLT, an additionally-arranged 10 G EPON OLT and a 10 G EPON ONU. The device comprises a logic unit, a 10 G EPON OLT transceiver and a 1 G EPON ONU transceiver. The invention can guarantee that no conflict exists in the up direction without additionally arranging a unified scheduling module.

The invention relates to an uplink and downlink transmission method of broadband optical access data, belonging to the technical field of data transmission in broadband optical access network. The method provided in the invention aims at compatibly transmitting 10G EPON and XGPON standard information in uplink and downlink directions by an optical distribution network. In downlink transmission process of the optical access data, physical layer structure of XGPON data is modified so that the XGPON data and 10G EPON data can be transmitted in a generally-used time division multiplexing manner. Thus, the 10G EPON data and the XGPON data can be transmitted compatibly in the downlink direction by the optical distribution network, thereby satisfying a demand for high efficient compatibility. In addition, in the uplink direction, an authorization mechanism is utilized to determine the serial number of an optical network unit which transmits uplink data, the data transmitting time of the authorized optical network unit, and length of the transmitted data, thereby being able to guarantee efficiency of data transmitting and data analyzing in the uplink direction.

Embodiments of the invention relate to a velocity detection method and a device, wherein the method comprises the following steps: filtering received signals to obtain a frequency component; comparing the frequency component with a threshold value, and outputting a velocity indicating signal according to the comparison result. The device comprises a filter processing module which is used for filtering the received signals to obtaining the frequency component; a comparison module which is used for comparing the frequency component with the threshold value; and a velocity judging logic module which is used for outputting the velocity indicating signal according to the comparison result. The embodiments perform filtering process to the received signals according to spectral distribution characteristics of the received signals so as to obtain the frequency component, and compare the frequency component with the threshold value so as to determine the velocity indicating signal. The velocity detection method and the device are suitable for the synchronous lead code re-defined by the 10G EPON standard.

The invention provides an RS (Reed-Solomon) decoding device for a 10G Ethernet passive optical network (EPON), which comprises a receiving buffer module, a corrector calculating module, a key equation solution module, a Chien search and error value calculating module, a delay buffer module and a sending buffer module. The invention also provides an RS decoding method for the 10G EPON. According to the invention, the coordination of RS decoding and the data rate can be realized and the multibyte parallel processing is realized.

The embodiment of the invention provides a line card, a design method, a communication control method and device and a storage medium. Functional configuration is performed on a pin function of a linecard through a new standard signal definition table obtained after classification processing is performed according to a first standard signal definition table corresponding to a 10G EPON and a second standard signal definition table corresponding to an xGPON. Therefore, the 10G EPON network and the xGPON network can be used on the same line card at the same time. Therefore, a user can flexibly select the corresponding working optical network mode according to the actual network requirement in the using process, the actual application requirement is met, meanwhile, the hardware design of theline card is simplified, and the equipment investment cost is reduced.

The invention discloses an optical module receiving circuit and an optical module. According to the characteristic that a receiving circuit of a symmetric 10G EPON OLT optical module operates by employing a time division multiplexing mode, an output terminal of a 1G limiting amplifier is provided with an isolation circuit, 1G signals amplified by the 1G limiting amplifier are isolated by employingthe isolation circuit, AMCC signals amplified by the 1G limiting amplifier are gated, and the functions of receiving digital business signals and bearing the AMCC signals of the optical module are realized. According to the circuit design, on one hand, the amplitude of the 1G signals is higher than that of 10G signals and the transmission rate of the 1G signals is closer to the transmission rateof the AMCC signals so that the 1G signal business is amplified and the AMCC signals can also be amplified by employing the 1G limiting amplifier, the output AMCC signals thereof are more easily recovered, and the influence on the 1G business signals is less; on the other hand, the isolation circuit is arranged at the rear end of the 1G limiting amplifier so that the influence on the performance of the whole receiving circuit can be reduced, and the loss of the business signals is avoided.

The invention relates to a single-fiber bidirectional symmetrical optical transceiver optical element for 10G-EPON, which comprises a transmitting terminal, a receiving terminal and an optical lens group. The transmitting terminal and the receiving terminal are arranged in parallel side by side. The optical lens group comprises a first prism, a second prism, a first filter plate and a second filter plate. An SC-type connector is arranged at the position at which the transmitting terminal and the receiving terminal are symmetrical. The first filter plate is arranged between the transmitting terminal and the SC-type connector. The first filter plate is an angle of 45 degrees to the direction of incident light. The first prism is arranged between the first filter plate and the transmitting terminal. The second filter plate is arranged between the first filter plate and the receiving terminal. The second prism is arranged between the second filter plate and the first filter plate. The single-fiber bidirectional symmetrical optical transceiver optical element of the invention better meets the standard of the 10G-EPON on main performance such as output optical power, sensitivity and the like and is compatible with an SFP+ standard module in shape.

The invention relates to a wavelength division multiplexing (WDM) module and method for realizing single-fiber transmission in a 10giga (G) Ethernet passive optical network (EPON) system. The WDM module comprises a three-channel WDM module installed at the optical line terminal (OLT) and a two-channel WDM module installed at the optical network unit (ONU) terminal, wherein the three-channel WDM module completes WDM of the three-channel four-wavelength optical signals; and the two-channel WDM module completes WDM of two-channel two-wavelength optical signals. The WDM module and the method havethe following beneficial effects: the WDM module and the method avoid overlap of the two kinds of optical signals by controlling the wavelength range of the optical signals with the wavelength of 1270nm to be 1270+ / -6.5nm and controlling the wavelength range of the optical signals with the wavelength of 1310nm to be 1280-1360nm, thus realizing WDM of the optical signals with various wavelengths, so that the 10G EPON system can adopt the single fiber for transmission, thus simplifying networking.

The invention discloses a timing device and method for automatically capturing a 10G EPON (10 Giga Ethernet Passive Optical Network) message and relates to the field of communication. The timing method comprises the following steps: after starting the automatic capturing, counting for a preset time by an absolute clock subjected to time correction of a user / OLT (Optical Line Terminal) / ONU (Optical Network Unit) under an absolute timing capturing mode; starting the 10G EPON message capturing and writing into a capturing cache according to screening conditions; under a relative timing capturing mode, detecting a frame content and a frame state captured by specific starting; starting to count by a timing clock till reaching the time preset by the user; and starting a packet grabbing process and writing into the capturing cache according to screening conditions. According to the timing method provided by the invention, the 10G EPON message can be automatically and accurately captured and analyzed; the space for storing the captured message is reduced by designing accurate timing and filtering conditions; the performance and the use efficiency of a remote dispatcher are promoted; and the intercommunication capacity of different equipment factories is enhanced.

The invention discloses a 10G EPON ONU BOB optical module-based receiving end hard pin connection circuit, which comprises a CPU module, a PMD module and a BOSA module, and is characterized in that the CPU module is connected with the PMD module through a differential line, and the PMD module is connected with the BOSA module through a differential line; the LED lamp further comprises a boosting module. The output end of the PMD module is connected with the input end of the boost module through a PWM wire and an FB wire of an APD. The output end of the boost module is connected with the receiving end of the BOSA module through a BIAS wire of an APD, and an RX + pin and an RX-pin of the BOSA module are connected with the input end of the PMD module through differential wires. According to the invention, the TO46 gold pin of the receiving end of the optical device does not pass through a flexible circuit board through various modes of optimizing PWM and FB wiring of the APD, shortening the length of a differential line and carrying out impedance control, independently supplying power to the receiving end circuit of the BOSA module and the like; and moreover, the sensitivity and the bit error rate level are not worse than those of a circuit connected by using a flexible circuit board, so that the production process difficulty and the material cost are reduced.

The invention discloses a 10G EPON asymmetric ONU emission optical eye pattern quality verification method. The method comprises the following steps: S1, analyzing an interference source and an interference mode; S2, analyzing a potential interference generation link, wherein the potential interference generation link comprises a BOB driving circuit power supply system, a BOSA device and a modulation signal from a main chip to a driving chip; and S3, setting experiments for each link in the step S2, and verifying the interference state. The problem is analyzed simplest, most directly and mosteffectively, and the direct reason of the interference problem is determined.

The invention discloses an optical module receiving circuit and an optical module. Particularly, 10G and 1G signals share the same limiting amplifier, and after optical signals of 10.3125 Gbps and 1.2448 Gbps are converted into electric signals through an APD photoelectric converter, constant-amplitude amplification electrical signal output is obtained through a trans-impedance amplifier and a 10 G limiting amplifier in sequence, wherein signals entering a 1G signal receiving pin are converted into an electric signal conforming to a 1G logic level interface through a level converter. According to the characteristics that the receiving circuit of a symmetrical 10G EPON OLT optical module works in the mode of division multiplexing in use, and the 10G receiving limiting amplifier can meet the work speed of 1-11 Gbps, the 10G limiting amplifier capable of being compatible with two rate signals can be adopted for amplifying the 1G and 10G signals from a trans-impedance amplifier, one 1G limiting amplifier and matching circuits surrounding the 1G limiting amplifier can be saved, the complexity of the circuits is reduced, and then interference among the circuits can be reduced so as to improve the signal receiving sensitivity.

The invention discloses a method for judging the optimum working voltage of an avalanche photodiode APD of 10G EPON, comprising the following steps: S1: Obtaining the reverse breakdown voltage V of the APD according to the test data of BOSA or the RSSI under the condition of no light br ;S2: Set an initial working bias voltage, select a fixed input optical power, test the current bit error rate or number of bit errors according to the preset duration, and then increase the working bias step by step with the set step value and repeat Test, test at least 3 points until the bit error rate or the number of bit errors increases; S3: Set the working bias as x and the bit error rate as y, and solve the quadratic equation y=ax 2 +bx+c, get a, b, c three coefficients; S4: According to the obtained a, b, c three coefficients, calculate the extreme value to get the corresponding APD DAC; S5: use the APD DAC value for sensitivity test, if qualified If passed, the APD DAC at the current temperature is subtracted from the corresponding temperature value in the APD DAC LUK table and updated to the APDDAC LUK after translation. If it fails, it fails.

The invention relates to a hardware coding method and circuit based on FEC (forward error correction) in a 10G EPON ONU (Ethernet passive optical network optical network unit). The hardware coding method comprises the following steps: S10. writing 66bit-wide data sent by a scrambler part into an fifo buffer; S20. writing the rest 65bit-wide data into nine register arrays in sequence after taking out the 66bit-wide data from the fifo buffer and removing the LSB (least significant bit) each time; S30. instantly starting a corresponding Reed-Solomon (RS) (252, 220) coder for coding once data are written into a certain register array, and then writing check bytes obtained through coding into corresponding bits of the corresponding register arrays to be registered; and S40. reading the data from the register arrays according to a certain format, thus obtaining the FEC coded data. The method and the circuit have the following advantages: the method is simple, convenient and effective and has high operability; and the circuit has a smaller scale and can achieve higher hardware circuit time sequence speed.

The invention discloses a 10G single-fiber bidirectional optical module, which comprises a burst laser driver, a burst light power indicator, a microcontroller, a single-fiber bidirectional optical device, an avalanche photoelectric diode bias control circuit, a limiting amplifier, a receiving end light power monitor and an SFP+ connector, wherein the microcontroller is mainly used for controlling the burst laser driver and the limiting amplifier; the single-fiber bidirectional optical device is connected between the burst laser driver and the limiting amplifier to realize conversion between electrical signals and light signals; and the avalanche photoelectric diode bias control circuit supplies a high bias voltage to a receiving end avalanche photoelectric diode and performs voltage compensation on the receiving end avalanche photoelectric diode according to the temperature property. The 10G single-fiber bidirectional optical module has the advantages of low design cost, simple circuit design and capability of meeting the requirement of a 10G EPON ONU symmetrical scheme.

The invention discloses a capturing circuit and a writing control method of 10G EPON (10 Giga Ethernet Passive Optical Network) messages. The writing control method comprises the following steps: receiving EPON messages interacting among 10G EPON OLT (Optical Line Terminal) and ONU (Optical Network Unit) through an optical module and a 10G SERDES (Serializer / Deserializer); combining and triggering message capturing according to set conditions after the decoding at a PCS (Physical Coding Sub-layer); writing the captured message into capturing cache, wherein the steps and formats for storing the capturing frames are as follows: writing 128bit frame data at an even number clock period while a frame envelope is valid; and writing the frame head byte number, the frame end byte number, the reaching time, the frame error indication, CRC (Cyclic Redundancy Check) verification error indication and frame boundary symbol of the frame within a clock period at the frame end. With the adoption of the capturing circuit and the writing control method, continuous EPON messages of 10 G can be captured and analyzed rapidly and precisely; the storage space of the captured message is reduced through specific triggering and screening conditions; the performance and the use efficiency of the remote scheduling are improved; and the inter-compatibility of factories of different equipment is enhanced.

The invention discloses a 10G EPON ONU BOB optical module-based receiving end hard pin connection circuit, which comprises a CPU module, a PMD module and a BOSA module, and is characterized in that the CPU module is connected with the PMD module through a differential line, and the PMD module is connected with the BOSA module through a differential line; the LED lamp further comprises a boosting module. The output end of the PMD module is connected with the input end of the boost module through a PWM wire and an FB wire of an APD. The output end of the boost module is connected with the receiving end of the BOSA module through a BIAS wire of an APD, and an RX + pin and an RX-pin of the BOSA module are connected with the input end of the PMD module through differential wires. According to the invention, the TO46 gold pin of the receiving end of the optical device does not pass through a flexible circuit board through various modes of optimizing PWM and FB wiring of the APD, shortening the length of a differential line and carrying out impedance control, independently supplying power to the receiving end circuit of the BOSA module and the like; and moreover, the sensitivity and the bit error rate level are not worse than those of a circuit connected by using a flexible circuit board, so that the production process difficulty and the material cost are reduced.