CN101110641A - Loopback optical receiving-transmitting module and its testing device and method - Google Patents
Loopback optical receiving-transmitting module and its testing device and method Download PDFInfo
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Abstract
The present invention discloses self-loop optical receiving/transmitting module, a test device and a method. Wherein, the module comprises an electrical interface for the optical receiving/ transmitting module in compliance with requirements for multi-source stipulations on small-sized packaging and hot plug. A differential signal input terminal of the electrical interface is correspondingly connected with a differential signal output terminal of the electrical interface through a series capacitance. A resistance is connected between two differential signal output terminals of the electrical interface. The self-loop optical receiving/transmitting module disclosed by the present invention can replace an actual XFP optical module of normal functions, realizes internal loop of communications in the optical module and is mounted in an optical interface board of equipment and suitable for extensive application to equipment test and aging, thus reducing optical module aging to some extent and avoiding reduced service life and increased failure rate of the optical module due to aging.
Description
Technical field
The present invention relates to the communication equipment technical field, relate in particular to the hot-swappable optical module (XFP of the little encapsulation of 10Gbit/s, 10Gigabit Small Form Factor Pluggable) applied technical field, this module meets the requirement of the hot-swappable optical module multi-source agreement of little encapsulation (MSA, Multi-source Agreement) INF8077i version.
Background technology
XFP optical module (the hot-swappable optical module of the little encapsulation of 10Gbit/s), it has little, hot-swappable these two advantages of encapsulation, is widely used in communication field.
In the communication equipment production test procedure, the building block of equipment (various integrated circuit board) all will be through various tests to reach quality control after production is finished, and one of them link is exactly long high temperature ageing test.Usually the veneer that is referred to as Optical Fiber Interface Board is just arranged in these integrated circuit boards, and optical module has been born photoelectricity/electric light and has been changed this indispensable key player in Optical Fiber Interface Board.Conventional high temperature ageing method of testing is that equipment under test is placed the hot environment operation, and passes through the ruuning situation of test instrumentation watch-dog, and monitoring comprises device parameters such as error rates of data, alarm.The optical module of Optical Fiber Interface Board has been born the function of service access, loopback or serial connection usually in the equipment, just can carry out normal high temperature ageing test, equipment disposition as shown in Figure 1 and professional connection diagram in the Optical Fiber Interface Board so optical module must be configured in.Optical module according to relevant industry standard, also is must be through the overaging flow process before manufacturing is dispatched from the factory.Therefore, optical module had passed through ageing process 2 times before whole set equipment enters in user's hand, caused optical module by overaging, caused the lost of life, and failure rate increases.
Because the speed of XFP optical module is 10Gbit/s, in a single day the transmission rate height breaks down in running, and the traffic lost that causes is very large.Though the patent No. is 200520126384.8 patent described a kind of SFP optical module from loop technique, but, propose correspondingly to reduce the degree of aging of XFP optical module and failure rate, and prolong its method of life not at the relevant specification standards of XFP optical module.Therefore, must find solution at the overaging of XFP optical module, and key point is the critical function of service access, loopback or serial connection that optical module is born in ageing process, must find a kind of alternative device to bear above-mentioned functions, the equipment that makes can not installed actual optical module in ageing process, thereby reduces the degree of aging of optical module.
Summary of the invention
Cause the XFP optical module by overaging, its lost of life and reduce the problem of its failure rate in order to solve existing optical module method of testing, the invention provides a kind of loopback optical receiving-transmitting module and testing apparatus thereof and method.
Loopback optical receiving-transmitting module of the present invention, comprise the optical module electrical interface that meets the requirement of XFP MSA multi-source agreement, through the corresponding connection of differential signal output of electric capacity and the described optical module electrical interface of serial connection, cross-over connection has a resistance to the differential signal input of described optical module electrical interface between two differential signal outputs of described optical module interface respectively.
Wherein, in described optical module electrical interface, I2C (Intel-Integrated Circuit bus, I2C bus) two-wire system serial communication interface respectively with the corresponding connection of bus port of the memory cell of described loopback optical receiving-transmitting module inside.Described memory cell adopts EEPROM (Electrically ErasableProgrammable Read Only Memory, electricallyerasable ROM (EEROM)) memory.Wherein, cross-over connection one resistance between the input signal end of the reference clock of described optical module electrical interface.
Adopt the testing apparatus of above-mentioned loopback optical receiving-transmitting module, described testing apparatus comprises the SDH (Synchronous Digital Hierarchy) tester, and SDH (Synchronous Digital Hierarchy) optical fibre channel data that provide simulation actual, the data legitimacy that reaches the monitoring input are provided for it; Described testing apparatus also comprises: the service access plate is used to realize that the access of service of synchronous digital system and described service access plate directly are connected with the SDH (Synchronous Digital Hierarchy) tester; Cross board is used for the business datum from described service access plate is crossed to the tested tabula rasa of being furnished with loopback optical receiving-transmitting module; Tested tabula rasa and loopback optical receiving-transmitting module, described loopback optical receiving-transmitting module are plugged on the tested tabula rasa, and described loopback optical receiving-transmitting module carries out the transmission of business datum by the light mouth and the described cross board of tested tabula rasa.
Wherein, described service access plate comprises: photoelectric conversion unit is used for the light signal of SDH (Synchronous Digital Hierarchy) tester output is converted to the needed signal of telecommunication; And Service Processing Unit, be used for above-mentioned signal is carried out traffic assignments and division.
Adopt the method for testing of above-mentioned loopback optical receiving-transmitting module, described method of testing is carried out according to following steps:
A, described SDH (Synchronous Digital Hierarchy) tester are given cross board by described service access plate with business data transmission;
B, described cross board are given described tested tabula rasa with business data transmission;
C, above-mentioned business datum arrive behind the light mouth of described tested tabula rasa by described loopback optical receiving-transmitting module the business datum loopback;
Behind D, the business datum loopback, described tested tabula rasa is delivered to described cross board with business datum and is intersected to other tabula rasas to be measured;
E, above-mentioned business datum are intersected back on the described service access plate, and the light mouth that the receipts light outlets of described SDH (Synchronous Digital Hierarchy) tester is connected to described service access plate is finished the indirectly testing task to described tested tabula rasa.
The present invention proposes a kind of loopback optical receiving-transmitting module, this loopback optical receiving-transmitting module can be used for the normal actual XFP optical module of alternative functions, realize that communication service in the optical module internal loopback, is installed in the Optical Fiber Interface Board of equipment, can in the test of equipment and ageing process, be extensive use of.Loopback optical receiving-transmitting module circuit structure of the present invention is simple, and several capacitance resistance wares can be realized professional loopback at the signal of telecommunication, and cost is low simultaneously, and its inside has only capacitance-resistance and the relevant circuit of eeprom memory spare; Whole installation cost is low, and the reliability height uses also convenient and simple.The present invention tests by the XFP optical module that utilizes loopback optical receiving-transmitting module to substitute reality and wears out, so reduced the degree of aging of optical module to a certain extent, the situation of having avoided the lost of life brought owing to optical module is aging and failure rate to increase takes place.
Simultaneously, the invention allows for a kind of testing apparatus and method that adopts above-mentioned loopback optical receiving-transmitting module, it is with respect to the method for testing of routine, method of testing of the present invention loopback optical receiving-transmitting module more easy to operate, easier and of the present invention is complementary, and can test a plurality of tested tabula rasas simultaneously.
Description of drawings
Fig. 1 is the testing apparatus structural representation of conventional XFP optical module;
Fig. 2 is the testing apparatus structural representation of loopback optical receiving-transmitting module of the present invention;
Fig. 3 is the necessary hardware connection diagram of loopback optical receiving-transmitting module of the present invention.
Embodiment
Below will describe each preferred embodiment of the present invention in detail.
As shown in Figure 3, loopback optical receiving-transmitting module 150 of the present invention, it comprises the two LC optical interfaces that meet the requirement of XFP MSA multi-source agreement and the optical module electrical interface of 30 contact pins, through the capacitor C 1 of serial connection, the C2 differential signal output Pin28 pin (TD-) and corresponding connection of Pin29 pin (TD+) with described optical module electrical interface, cross-over connection has a resistance R 1 between two differential signal output Pin28 pin (TD-) of described optical module electrical interface and the Pin29 pin (TD+) respectively for the differential signal input Pin17 pin (RD-) of described optical module electrical interface and Pin18 pin (RD+).The resistance of two differential signal input Pin17 pin (RD-) and Pin18 pin (RD+) cross-over connection is differential signal impedance matching resistance, and the capacitor C 1, the C2 that are connected in series between differential signal are ac coupling capacitors.Resistance R 1 resistance that receives the cross-over connection of data difference input can be 100 Ω ± 5%, and ac coupling capacitor C1, C2 can be adopted as the chip ceramic capacitor of 0.1 μ F.
In the optical module electrical interface, I2C two-wire system serial communication interface respectively with the bus port Pin10 pin (SCL) and corresponding connection of Pin11 pin (SDA) of the memory cell of described loopback optical receiving-transmitting module inside.Described memory cell adopts eeprom memory.Optical module electrical interface Pin3 pin (MOD_DESEL) control signal keeps effectively, and then the eeprom memory in the optical module can operate as normal, and the information that storage is relevant can supply exterior read-write.
Cross-over connection one resistance R 2 between the input signal end Pin24 pin (REFCLK+) of the reference clock of above-mentioned optical module electrical interface and the Pin25 pin (REFCLK-) is in order to realize the impedance matching at the external clock source signal.Resistance R 2 can be 100 Ω ± 5%.
In the electrical interface of optical module, other signal all will have fixing effective or disarmed state, it is the low level that Pin14 pin (RX_LOS), Pin12 pin (MOD_ABS), Pin13 pin (MOD_NR) connect optical module inside, and connecing high level, Pin4 pin (INTERRUPT) make it invalid, in order to avoid board software is judged by accident, influence the operate as normal of veneer.The power supply of described optical module electrical interface is connected the requirement that meets XFP MSA (Multi-source Agreement, multi-source agreement) multi-source agreement INF8077i with the pin of ground connection.All the other not specifically defined electrical interfaces meet the requirement of XFP optical module MSA multi-source agreement INF8077i.The profile of loopback optical receiving-transmitting module of the present invention and structure meet the requirement of XFP MSA multi-source agreement INF 8077i, and its golden finger (the optical module electrical interfaces of 30 contact pins) profile specification and pin are arranged the requirement that meets XFP MSA multi-source agreement.The PCB cabling of loopback optical receiving-transmitting module transceive data differential lines of the present invention requires: it is right to walk differential lines on the PCB, and differential impedance is 100 Ω ± 10%, and single-ended impedance is 50 Ω ± 10%.
From above-mentioned structure as can be seen, loopback optical receiving-transmitting module of the present invention is compared with the normal X FP optical module of INF 8077i standard definition, because expensive Laser Devices have been saved in described optical module inside, so the optical module cost reduces greatly, loopback has been carried out to data-signal in optical module inside in addition, need not add optical fiber and optical attenuator again during test, simple in structure, price is objective, and is easy to operate, is particularly suitable for using in various test occasions.The pin definitions of above-mentioned loopback optical receiving-transmitting module 150 electrical interfaces sees the following form.
| Pin | The title abbreviation | Full name/description | Chinese is explained |
| Pin29 | TD+ | Transmitter Non-Inverted Data Input | Loopback optical receiving-transmitting module sends data outputs (anode of differential signal) |
| Pin28 | TD- | Transmitter Inverted Data Input | Loopback optical receiving-transmitting module sends data outputs (negative terminal of differential signal) |
| Pin18 | RD+ | Receiver Non-Inverted Data Output | The light mouth receives data outputs (anode of differential lines) |
| Pin17 | RD- | Receiver Inverted Data Output | The light mouth receives data outputs (negative terminal of differential lines) |
| Pin24 | REFCLK+ | Not used, internally terminated to 50ohm (100ohm diff) | Optical module reference clock (anode of differential signal) |
| Pin25 | REFCLK- | Not used, internally terminated to 50ohm (100ohm diff) | Loopback optical receiving-transmitting module reference clock (negative terminal of differential signal) |
| Pin12 | MOD_AB S | Indicates Module is not present. Grounded in the Module | Loopback optical receiving-transmitting module index signal on the throne.Effectively low, the pilot light module is on the throne. |
| Pin13 | MOD_NR | Module Not Ready; Indicating Module Operational Fault | Optical module is not ready for.The failure of high level pilot light module operation. |
| Pin14 | RX_LOS | Receiver Loss Of Signal Indicator | The Received Loss Of Signal indication.High level is effective, and index signal is lost. |
| Pin4 | INTERRU PT | Indicates presence of an important condition which can be read over the 2-wire serialinterface | Interrupt signal.Low level is effective, and the indication user can read the optical module present behavior by 2 line serial line interfaces when effective. |
| Pin10 | SCL | 2-Wire Serial Interface Clock | 2 line serial line interface clock signals |
| Pin3 | MOD_DE SEL | Module De-select; When held low allows the module to respond to 2-wire serialinterface | Module removes to select signal.High level is effective, and when invalid, module just can respond 2 line serial line interfaces. |
| Pin10 | SDA | 2-Wire Serial Interface Data Line | 2 line serial line interface data-signals |
As shown in Figure 2, adopt the testing apparatus of above-mentioned loopback optical receiving-transmitting module, comprise SDH (Synchronous Digital Hierarchy, SDH (Synchronous Digital Hierarchy)) tester 110, service access plate 120, cross board 130, tested tabula rasa 140 and loopback optical receiving-transmitting module 150; The SDH optical fibre channel data that provide simulation actual, the data legitimacy that reaches the monitoring input are provided SDH tester 110; Service access plate 120 is used to realize that the access of SDH business and service access plate 120 directly are connected with SDH tester 110; Cross board 130 is used for the business datum from service access plate 120 is crossed to the tested tabula rasa 140 of being furnished with loopback optical receiving-transmitting module 150; Loopback optical receiving-transmitting module 150 is plugged on the tested tabula rasa 140, and loopback optical receiving-transmitting module 150 carries out the transmission of business datum by the light mouth and the cross board 130 of tested tabula rasa 140.Wherein, service access plate 120 comprises: photoelectric conversion unit 121 and Service Processing Unit 122, photoelectric conversion unit 121 is used for the light signal of SDH tester 110 outputs is converted to the needed signal of telecommunication, and Service Processing Unit 122 is used for above-mentioned signal is carried out traffic assignments and division.
As shown in Figure 2, adopt the method for testing of said apparatus, carry out according to following steps:
A, SDH tester 110 are given cross board 130 by service access plate 120 with business data transmission;
B, cross board 130 are given tested tabula rasa 140 with business data transmission;
C, above-mentioned business datum arrive behind the light mouth of tested tabula rasa 140 by loopback optical receiving-transmitting module 1 50 the business datum loopback;
Behind D, the business datum loopback, tested tabula rasa 140 is delivered to cross board 130 with business datum and is intersected to other tabula rasas to be measured;
E, above-mentioned business datum are intersected back on the service access plate 130, and the light mouth that the receipts light outlets of SDH tester 110 is connected to service access plate 120 is finished the indirectly testing task to tested tabula rasa 140.
Testing apparatus of the present invention and method can guarantee not damage expensive optical module under test conditions such as reliability, thereby reduce testing cost.
Illustrating of above-mentioned each concrete steps is comparatively concrete, can not therefore think the restriction to scope of patent protection of the present invention, and scope of patent protection of the present invention should be as the criterion with claims.
Claims (7)
1. loopback optical receiving-transmitting module, it comprises the optical module electrical interface that meets the requirement of the hot-swappable optical module multi-source agreement of little encapsulation, it is characterized in that, through the corresponding connection of differential signal output of electric capacity and the described optical module electrical interface of serial connection, cross-over connection has a resistance to the differential signal input of described optical module electrical interface between two differential signal outputs of described optical module electrical interface respectively.
2. optical transceiver module according to claim 1 is characterized in that, in described optical module electrical interface, I2C two-wire system serial communication interface respectively with the corresponding connection of bus port of the memory cell of described loopback optical receiving-transmitting module inside.
3. optical transceiver module according to claim 2 is characterized in that, described memory cell adopts eeprom memory.
4. optical transceiver module according to claim 1 is characterized in that, cross-over connection one resistance between the input signal end of the reference clock of described optical module electrical interface.
5. adopt the testing apparatus of the described loopback optical receiving-transmitting module of claim 1, described testing apparatus comprises the SDH (Synchronous Digital Hierarchy) tester, and SDH (Synchronous Digital Hierarchy) optical fibre channel data that provide simulation actual, the data legitimacy that reaches the monitoring input are provided for it; It is characterized in that described testing apparatus also comprises:
The service access plate is used to realize that the access of service of synchronous digital system and described service access plate directly are connected with the SDH (Synchronous Digital Hierarchy) tester;
Cross board is used for the business datum from described service access plate is crossed to the tested tabula rasa of being furnished with loopback optical receiving-transmitting module;
Tested tabula rasa and loopback optical receiving-transmitting module, described loopback optical receiving-transmitting module are plugged on the tested tabula rasa, and described loopback optical receiving-transmitting module carries out the transmission of business datum by the light mouth and the described cross board of tested tabula rasa.
6. testing apparatus according to claim 5 is characterized in that, described service access plate comprises:
Photoelectric conversion unit is used for the light signal of SDH (Synchronous Digital Hierarchy) tester output is converted to the needed signal of telecommunication; And Service Processing Unit, be used for above-mentioned signal is carried out traffic assignments and division.
7. adopt the method for testing of the described loopback optical receiving-transmitting module of claim 1, it is characterized in that described method of testing is carried out according to following steps:
A, described SDH (Synchronous Digital Hierarchy) tester are given cross board by described service access plate with business data transmission;
B, described cross board are given described tested tabula rasa with business data transmission;
C, above-mentioned business datum arrive behind the light mouth of described tested tabula rasa by described loopback optical receiving-transmitting module the business datum loopback;
Behind D, the business datum loopback, described tested tabula rasa is delivered to described cross board with business datum and is intersected to other tabula rasas to be measured;
E, above-mentioned business datum are intersected back on the described service access plate, and the light mouth that the receipts light outlets of described SDH (Synchronous Digital Hierarchy) tester is connected to described service access plate is finished the indirectly testing task to described tested tabula rasa.
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| CNA2007100757261A CN101110641A (en) | 2007-08-08 | 2007-08-08 | Loopback optical receiving-transmitting module and its testing device and method |
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| CN102346222A (en) * | 2011-06-09 | 2012-02-08 | 迈普通信技术股份有限公司 | Device, system and method for testing output electrical signals of optical interfaces |
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| CN105812052A (en) * | 2016-05-19 | 2016-07-27 | 大连藏龙光电子科技有限公司 | Calibration system and method for optical module |
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| CN101902272A (en) * | 2010-07-07 | 2010-12-01 | 东莞市铭普实业有限公司 | Optical transceiver module SFP tester |
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| CN102346222B (en) * | 2011-06-09 | 2013-09-18 | 迈普通信技术股份有限公司 | Device, system and method for testing output electrical signals of optical interfaces |
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| CN102647229B (en) * | 2012-04-16 | 2017-04-12 | 中兴通讯股份有限公司 | XFP (10 Gigabit Small Form Factor Pluggable) interface optical module self-loop method and device |
| CN102647229A (en) * | 2012-04-16 | 2012-08-22 | 中兴通讯股份有限公司 | XFP (10 Gigabit Small Form Factor Pluggable) interface optical module self-loop method and device |
| CN104317215A (en) * | 2014-09-30 | 2015-01-28 | 武汉电信器件有限公司 | Optical module aging and temperature cycling system and operation process thereof |
| CN104317215B (en) * | 2014-09-30 | 2017-04-12 | 武汉电信器件有限公司 | Operation process of optical module aging and temperature cycling system |
| CN105988073A (en) * | 2015-02-12 | 2016-10-05 | 中兴通讯股份有限公司 | Detection device, detection system and single board |
| CN105553547A (en) * | 2015-12-16 | 2016-05-04 | 国网福建省电力有限公司 | Monitoring system of standby optical power cable |
| CN105812052A (en) * | 2016-05-19 | 2016-07-27 | 大连藏龙光电子科技有限公司 | Calibration system and method for optical module |
| CN105812052B (en) * | 2016-05-19 | 2018-08-21 | 大连藏龙光电子科技有限公司 | A kind of optical module calibration system and method |
| CN108055075A (en) * | 2017-12-13 | 2018-05-18 | 武汉电信器件有限公司 | A kind of optical module temperature follows test system and method |
| CN114124227A (en) * | 2020-08-26 | 2022-03-01 | 华为技术有限公司 | Optical transceiver and optical signal processing method |
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