CN1761181A - Device for testing time characteristic of outburst and error rate in outburst optical fiber transmission system - Google Patents
Device for testing time characteristic of outburst and error rate in outburst optical fiber transmission system Download PDFInfo
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Abstract
The device includes unit for sending spurt signaling and unit for receiving spurt signaling. The unit for sending spurt signaling is able to generate two routes of spurt signaling interface accorded with EPON (base on Ethernet passive optical network). The receiver for spurt signaling can realize synchronization and reception of input spurt signaling quickly so as to be able to test performance of each optical device in outburst optical transmission system (i.e. up going system), especially to test outburst time characteristic and bit error performance in optical sending and receiving modules operated at outburst mode. The device can operate at continuous mode. The invention is applicable to testing bit error performance in up going transmission channel of passive optical network.
Description
Technical field:
The invention belongs to photoelectron technology and technical field of optical fiber communication.Be particularly related to the measurement of light signal in the transmission performance of PON (in the EPON).
Background technology:
Passive optical network technique is considered to one of broadband access scheme of tool potentiality.The up channel of EPON is a kind of burst fiber optic transmission system, and the performance test of this system is very important.But testing equipment does not also have full maturity at present.Burst type storage oscilloscope commonly used at present is used for the eye pattern of test burst formula light emission module.But it is far from being enough only estimating its performance with eye pattern, particularly for the burst type Optical Receivers.This is because behind the limiting amplifier of the output stage of process Optical Receivers, signal has been finished judgement, even eye diagram quality is fine, exists but also have error code.Therefore, the appraisal procedure of the most direct burst module is the error code testing that tested optical module is carried out burst type.
Summary of the invention:
This testing apparatus is simulated actual mode of operation and applied environment in the burst fiber optic transmission system fully, with direct mode the burst response time properties and the bit error performance of system is tested.Use this testing apparatus, can test at the burst response time properties of burst optical transceiver module and other opto-electronic device among the G-EPON (based on the passive gigabit optical-fiber network of Ethernet) and to the influence of systematic function.The exploitation that it will become passive optical network equipment and crucial opto-electronic device provides good test platform.
The invention is characterized in that this device contains:
A slice digital integrated circuit chip is integrated with in this chip: burst response time and error rate test unit, burst generation unit, burst are accepted the unit, wherein
Burst response time and error rate test unit contain:
And interface circuit, address output end links to each other with the corresponding address of external microcontroller end, and data output end links to each other with the corresponding data terminal of external microcontroller, communicates by letter with CPU by single-chip microcomputer, (Num Addr) links to each other with internal circuit respectively with the enable signal output also to comprise two inputs;
Enable control circuit, send two path control signal: ONU1_Control signal and ONU2_Control signal, this input that enables control circuit links to each other with preceding enable signal output described and interface circuit;
The code element comparator is preset with the burst frame of following form: sync bit, and the K28.5 sign indicating number of variable number, positive and negative alternating polarity sends, and is used for the test burst response time; Marker bit, the K28.6 sign indicating number, 2, just, negative polarity is alternately sending, and is used for fixing a burst frame; ID is used to distinguish the transmission source, and word length is 1; The pseudorandom 10B sign indicating number of variable-length is used to test the error rate; Redundancy section;
It is output as the response time and the error rate error code counting circuit, and the input of this error rate calculation circuit links to each other with the corresponding output end of preceding described code element comparator; This error code counting circuit output (Num, Addr) (Num Addr) links to each other with the respective input of preceding described and interface circuit;
The burst generation unit, contain:
First yard type control circuit is used to control first via signal and sends usefulness;
First counting circuit contains following counter: count0, and the transmit status of first via signal is exported complete 0 yard counting number; Count1 is to a sync bit counting number of sync bit in the first via burst frame that is sent; Count2, to the marker bit counting, count4 is to the individual counting number of pseudo-random data; Count5 is to the individual counting number of redundancy section in the first via signal frame that is sent;
First data output circuit is used to export first via signal, except the burst frame that presets form as mentioned above, also is provided with the test frame of following form: sync bit, and 124 K28.5 sign indicating numbers, positive and negative alternating polarity sends; Marker bit, K28.2 sign indicating number, single positive polarity code element; Redundancy section, infinite a plurality of; The ranging code that send is to be used for measuring when two-way sends the distance of every road with respect to the light terminal, to control the delivery time of each road signal, prevents two paths of signals overlapping usefulness in optical fiber;
The second road sign indicating number type control circuit is used to control the second road signal and sends usefulness;
Second counting circuit contains and the identical counter type of described first counting circuit, is used for the counting to the second road signal;
Second data output circuit contains the ranging frame and the burst frame of form as mentioned above equally, is used to export the second road signal and uses;
The output of the described first yard type control circuit and first counting circuit links to each other with the respective input of described first data output circuit respectively, and the input of the described first yard type control circuit and first counting circuit links to each other with the corresponding output end that enables control circuit respectively;
The output of the described second yard type control circuit and second counting circuit links to each other with the respective input of described second data output circuit respectively, and the input of the described second yard type control circuit and second counting circuit links to each other with the corresponding output end that enables control circuit respectively;
, find range earlier when sending burst each,, then allow second data output circuit send out earlier, and send out behind first data output circuit if the second tunnel distance is big, otherwise just in time opposite; Suppose first of second data circuit, lead time is T=T
1+ T
2+ T
L, T
LBe sending first via burst ONU1 and the second road burst ONU2 pairing time of frame length separately, T
1For ONU2 transmitting terminal and ONU1 transmitting terminal separately from the pairing time interval of difference of terminal distance, T
2When being the second road signal ONU2 incoming terminal, first via signal ONU1 lags behind the time interval of described the second road signal ONU2, is set point; After sending first pair of burst, each burst frame of the same type with interval T '=2T
2+ T
LSend;
The optical line terminal data are accepted the unit, and the output of this unit links to each other with the input of described code element comparator;
The four-way multiplexer, adopt the S2204 chip, this chip has two groups of inputs, every group has burst input and laser enable signal input, first group of input links to each other with corresponding two outputs of described first data output circuit, second group of input links to each other with corresponding two outputs of described second data output circuit, described laser enable signal begins when the code stream state is busy state when sending, send continuously, till the transmission code stream was an idle condition, described S2204 chip was the interrupt signal that sends to two lasers;
Burst clock recovery and demodulation multiplexer adopt the ZenKo chip, and described two groups of lasers once lead to described ZenKo chip through optical combiner, optical fiber avalanche diode, output optical line terminal data; The optical line terminal data output end of this ZenKo chip links to each other with the respective input of described optical line terminal Data Receiving end member.
In the optical communication system under the burst mode, the characteristic of opto-electronic device with at running hours very big difference is arranged, its concrete manifestation is that there is the burst response time in various opto-electronic devices in the system when handling burst, in this response time, the transmission of burst will have very many error codes.Therefore, the burst response time is one of most important parameters in the burst fiber optic transmission system.In addition, because system works is at burst mode, the error code testing equipment continuous operation mode commonly used under can only be measured the platform error rate of system, is difficult to measure the error rate of burst optical transmission system after the response time that happens suddenly.Thereby the present invention will realize a kind of burst response time and the error rate that can measure fiber optic transmission system under the burst mode.Simultaneously, it can also be operated in continuous mode, measures the performance of the fiber optic transmission system under the continuous operation mode.Like this, this device will be used for measuring the burst response characteristic and the transmission performance of EPON channel easily, promptly can be applicable to the performance test of the up optical channel of continuous operation mode in the EPON simultaneously, also can be applicable to the performance test of the up optical channel of burst mode of operation.
Send 7 K28.5, signal receiving circuit can receive a frame, sends 6 K28.5, does not just receive a frame, and therefore obtaining the laser burst response time is 48ns, and error is 8ns.
It is as follows that range finding obtains data:
| Distance (rice) | 0 | 100 | 200 | 500 | 1000 | 2000 | 5000 |
| Time (byte) | 36 | 98 | 160 | 343 | 651 | 1261 | 3103 |
Obtain diagram (seeing accompanying drawing 8)
Wherein slope is
k＝0.6132byte/m＝4.9056ns/m＝4.9056ms/km。
Analyze:
When distance was 0 meter, the time was that 36byte mainly is because the light path decision that circuit delay and tester device itself have.
Slope and actual conditions have some deviations, mainly because clock crystal oscillator is not that accurate 125Mhz causes.
Description of drawings:
Fig. 1 is the system global structure schematic diagram.
Fig. 2 is the error rate tester basic circuit.
Fig. 3 communicates to connect schematic diagram for PC.
Fig. 4 is ONU transmission timing figure.
Fig. 5 receives sequential chart for OLT.
Fig. 6 is burst response time test philosophy figure.
Fig. 7 sends schematic diagram for multichannel.
Fig. 8 is the distance test result.
Embodiment:
Fig. 1 is the burst optical communication system burst time response that proposes of the present invention and the theory diagram of error rate tester.It is divided into burst generating unit, four-way Multiplexing module, burst clock recovery and demultiplexing module, burst receiving element and burst response time and five parts in error code testing unit, wherein:
Error code can appear in preceding several byte of transfer of data under burst mode, is exactly the response time that happens suddenly during this period of time.For accurate transmission data, we must measure during this period of time, and here we realize measuring by the error code counting number to this section special time, and are as follows for specifically measuring design burst frame format:
(1) burst frame
| Sync bit | Marker bit | ID | The pseudorandom 10B data of variable-length | Redundancy section |
1. sync bit: the k28.5 of variable number ,+,-alternating polarity sends, and is used for the test burst response time;
2. marker bit: the k28.6 sign indicating number, 2 ,+,-alternating polarity sends, and fixes a burst frame;
3. ID: be used for distinguishing the transmission source, word length is 1;
4. the pseudorandom 10B sign indicating number of variable-length is used to test the error rate;
5. redundancy section, 56 k28.2 ,+,-alternating polarity sends;
ONU sends and the sequential chart of OLT received frame is seen accompanying drawing 4 and accompanying drawing 5.Described ONU is an optical network unit, and OLT is an optical line terminal.
The burst response time: under burst mode, the preceding several byte of the frame head of a frame can be eaten up and be formed error code, see accompanying drawing 6.The transmit frame frame head of transmitting terminal has L 28.5 code elements, and receiving terminal receives only M.Then have N=L-M K28.5 code element to be eaten up, the N time corresponding happens suddenly the response time exactly.
If receiver is not received the K28.5 code element (M＜=0) of frame head simultaneously, entire frame does not go up synchronously and will be dropped so.Therefore we can determine the response time that happens suddenly by the number (L) of changing frame head K28.5.Entire frame just can be received when having only number L as K28.5＞N, so N=L
Min-1, the burst response time is (L
Min-1) * 8ns.(L
MinFor receiving the minimum sync bit number of frame)
The error rate: pseudo-random data that receives and the local pseudo-random data (fixed sequence program) that produces are compared, obtain the error code number and calculate the error rate simultaneously.
In order to measure influencing each other between the multiple signals, we design and realize that multichannel sends.When multichannel sent, if directly send, then signal can be overlapping in optical fiber, leads to errors.So must measure the distance of every road, control the delivery time on each road simultaneously with respect to OLT.
Specific design ranging frame form is as follows:
(1) ranging frame
| K28.5+ ,-(124) | K28.2+ | ″1010101010″ |
1. sync bit: 124 k28.5 ,+,-alternating polarity sends,
2. marker bit: K28.2 is single+the polarity code element
3. redundancy section is infinite a plurality of
Range finding: at first utilize 124 K28.5 to make receiving terminal go up this frame synchronously, send then that counter begins counting behind the K28.2+, receive the K28.2 counting and stop, if counting is x, then distance is 1.6x rice (every 8ns transmits 1.6 meters).
Multichannel sends: as accompanying drawing 7, after range finding is finished, record ONU1 and be L from the terminal distance
1, ONU2 is L from the terminal distance
2, and T
L2-T
L1=T
1, (because the light velocity is certain in the optical fiber, distance and time corresponding are directly proportional), the frame length of ONU1 and ONU2 all is L.Then the leading ONU1 of ONU2 sends, and lead time is T=T
1+ T
2+ T
L, send behind first pair of frame each ONU with interval T '=2T
2+ T
LSend, will receive the frame order at receiving terminal like this is ONU2-ONU1-ONU2 ..., be T blanking time simultaneously
2, having realized that 2 the tunnel send, multichannel sends and also can realize equally.
The burst generating unit produces two groups of parallel burst of totally four passages and enable signals of laser.Parallel burst is the burst packets that designs at the burst applied environment specially, and enable signal is used to control the unlatching and the shutoff of laser.The output of these four passages is 10 parallel-by-bit signals, and clock frequency is 125MHZ.
The four-way Multiplexing module is that the parallel signal with four-way is converted into serial signal, its data rate be 1.25Gb/s. in order to adapt to different applied environments, four road bursts can also be used in combination.
Burst clock recovery and demultiplexing module are that the burst that will import carries out clock and data recovery, are 10 parallel signal simultaneously with its serial to parallel conversion.
The function of burst receiving element is to discern the frame structure of the burst of importing and read related data.
Burst response time and error code testing unit then are that the burst that will send compares and analyzes with the burst of reception, finally record the burst response time and the error rate of the fiber optic transmission system that happens suddenly.
In the device that we finish, Multiplexing Unit adopts the S2204 multiplexer of AMCC company, and burst clock recovery and demultiplexing unit adopt the burst demultiplexing chip of the Zenko of AMCC company, and other three parts unit adopts special chip to realize.
See Fig. 1～Fig. 3.
Device of the present invention is as follows in the flow process of transmitting terminal and receiving terminal:
Optical network unit is ONU sequential (a non-distance measurement mode):
(1) 0NU_Control=' 0 ', idle condition all is changed to 0 to all counters, and Laser_ENA is " 0000000000 " (laser does not enable), otherwise enters step 2 transmit status
(2) sending code stream is idle bytes " 0000000000 ", and Laser_ENA is " 1111111111 " (laser enables), and count0 of every transmission simultaneously adds 1, if count0=Idle_Time (computer-controlled complete 0 byte number) then changes step 3 over to
(3) sending code stream is K28.5 ,+,-alternating polarity sends, and Laser_ENA is " 1111111111 ", and count1 of every transmission simultaneously adds 1, if count1=response_Time (sync bit number, computer control) then changes step 4 over to
(4) send marker bit (K28.6) ,+,-alternating polarity sends, and Laser_ENA is " 1111111111 ", and count2 of every transmission simultaneously adds 1, if count2=" 10 " then changes step 5 over to
(5) send the ID position, Laser_ENA is " 1111111111 ", sends to change step 6 over to
(6) send pseudo random sequence, Laser_ENA is " 1111111111 ", and count4 of every transmission simultaneously adds 1, if count4=Frame_Length (pseudo-random data number in the frame, computer control) then changes step 7 over to
(7) send K28.2 ,+,-alternating polarity, Laser_ENA be " 1111111111 ", count5 of every transmission of while adds 1, if count5=" 111000 " then return idle condition.
Optical line terminal is the OLT sequential
(1) the idle condition counter is clear 0, if receive data OLT_Data=K28.6, then changes step 2 presynchronization state over to, otherwise keeps idle condition
(2) if receive OLT_Data=K28.6 again, then change step 3 over to, otherwise return idle condition
(3) receive the ID position, if undesirable, return idle condition, otherwise change step 4 over to
(4) begin to receive pseudo-random data, judge simultaneously and correct errors, correctly count_data is added 1, otherwise count_error is added 1, code element OLT_count4 of every reception adds 1.If OLT_count4=Frame_Length then returns idle condition.
Claims (1)
- The burst fiber optic transmission system burst time response and error rate test device, it is characterized in that this device contains:A slice digital integrated circuit chip is integrated with in this chip: burst response time and error rate test unit, burst generation unit, burst are accepted the unit, whereinBurst response time and error rate test unit contain:And interface circuit, address output end links to each other with the corresponding address of external microcontroller end, and data output end links to each other with the corresponding data terminal of external microcontroller, communicates by letter with CPU by single-chip microcomputer, (Num Addr) links to each other with internal circuit respectively with the enable signal output also to comprise two inputs;Enable control circuit, send two path control signal: ONU1_Control signal and ONU2_ControlSignal, this input that enables control circuit links to each other with preceding enable signal output described and interface circuit;The code element comparator is preset with the burst frame of following form: sync bit, and the K28.5 sign indicating number of variable number, positive and negative alternating polarity sends, and is used for the test burst response time; Marker bit, the K28.6 sign indicating number, 2, just, negative polarity is alternately sending, and is used for fixing a burst frame; ID is used to distinguish the transmission source, and word length is 1; The pseudorandom 10B sign indicating number of variable-length is used to test the error rate; Redundancy section;It is output as the response time and the error rate error code counting circuit, and the input of this error rate calculation circuit links to each other with the corresponding output end of preceding described code element comparator; This error code counting circuit output Num, the respective input Num of Addr and preceding described and interface circuit, Addr links to each other;The burst generation unit, contain:First yard type control circuit is used to control first via signal and sends usefulness;First counting circuit contains following counter: count0, and the transmit status of first via signal is exported complete 0 yard counting number; Count1 is to a sync bit counting number of sync bit in the first via burst frame that is sent; Count2, to the marker bit counting, count4 is to the individual counting number of pseudo-random data; Count5 is to the individual counting number of redundancy section in the first via signal frame that is sent;First data output circuit is used to export first via signal, except the burst frame that presets form as mentioned above, also is provided with the test frame of following form: sync bit, and 124 K28.5 sign indicating numbers, positive and negative alternating polarity sends; Marker bit, K28.2 sign indicating number, single positive polarity code element; Redundancy section, infinite a plurality of; The ranging code that send is to be used for measuring when two-way sends the distance of every road with respect to the light terminal, to control the delivery time of each road signal, prevents two paths of signals overlapping usefulness in optical fiber;The second road sign indicating number type control circuit is used to control the second road signal and sends usefulness;Second counting circuit contains and the identical counter type of described first counting circuit, is used for the counting to the second road signal;Second data output circuit contains the ranging frame and the burst frame of form as mentioned above equally, is used to export the second road signal and uses;The output of the described first yard type control circuit and first counting circuit links to each other with the respective input of described first data output circuit respectively, and the input of the described first yard type control circuit and first counting circuit links to each other with the corresponding output end that enables control circuit respectively;The output of the described second yard type control circuit and second counting circuit links to each other with the respective input of described second data output circuit respectively, and the input of the described second yard type control circuit and second counting circuit links to each other with the corresponding output end that enables control circuit respectively;, find range earlier when sending burst each,, then allow second data output circuit send out earlier, and send out behind first data output circuit if the second tunnel distance is big, otherwise just in time opposite; Suppose first of second data circuit, lead time is T=T 1+ T 2+ T L, T LBe sending first via burst ONU1 and the second road burst ONU2 pairing time of frame length separately, T 1For ONU2 transmitting terminal and ONU1 transmitting terminal separately from the pairing time interval of difference of terminal distance, T 2When being the second road signal ONU2 incoming terminal, first via signal ONU1 lags behind the time interval of described the second road signal ONU2, is set point; After sending first pair of burst, each burst frame of the same type is with interval T '=2T 2+ T LSend;The optical line terminal data are accepted the unit, and the output of this unit links to each other with the input of described code element comparator;The four-way multiplexer, adopt the S2204 chip, this chip has two groups of inputs, every group has burst input and laser enable signal input, first group of input links to each other with corresponding two outputs of described first data output circuit, second group of input links to each other with corresponding two outputs of described second data output circuit, described laser enable signal begins when the code stream state is busy state when sending, send continuously, till the transmission code stream was an idle condition, described S2204 chip was the interrupt signal that sends to two lasers;Burst clock recovery and demodulation multiplexer adopt the ZenKo chip, and described two groups of lasers once lead to described ZenKo chip through optical combiner, optical fiber avalanche diode, output optical line terminal data; The optical line terminal data output end of this ZenKo chip links to each other with the respective input of described optical line terminal Data Receiving end member.
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| CN102970077A (en) * | 2012-12-13 | 2013-03-13 | 上海市共进通信技术有限公司 | Error rate testing device and method for circuit board integrated optical component system |
| CN103166698A (en) * | 2013-02-27 | 2013-06-19 | 武汉电信器件有限公司 | 10*10 Giga-bits per second (G) signal source code pattern generator |
| WO2015109795A1 (en) * | 2014-01-22 | 2015-07-30 | 中兴通讯股份有限公司 | Optical burst transport network, node, transmission method and computer storage medium |
| US10231037B2 (en) | 2014-01-22 | 2019-03-12 | Xi'an Zhongxing New Software Co.Ltd | Optical burst transport network, node, transmission method and computer storage medium |
| US11128940B2 (en) | 2014-01-22 | 2021-09-21 | Zte Corporation | Transmission method for an optical burst transport network, slave node, and computer storage medium |
| CN104793069A (en) * | 2015-03-11 | 2015-07-22 | 四川华拓光通信股份有限公司 | Data transmission performance self-checking system of active cable |
| CN104793069B (en) * | 2015-03-11 | 2018-03-06 | 四川华拓光通信股份有限公司 | A kind of data transmission performance self-checking system of active type cable |
| CN106506106A (en) * | 2016-10-28 | 2017-03-15 | 中国计量科学研究院 | Based on the high-accuracy temporal frequency source that optical fiber time is transmitted |
| CN106506106B (en) * | 2016-10-28 | 2020-03-24 | 中国计量科学研究院 | High-precision time frequency source based on optical fiber time transmission |
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