CN105281826A - A system and a method for calibrating the receiving sensitivity of optical receiver components - Google Patents
A system and a method for calibrating the receiving sensitivity of optical receiver components Download PDFInfo
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- CN105281826A CN105281826A CN201510808315.3A CN201510808315A CN105281826A CN 105281826 A CN105281826 A CN 105281826A CN 201510808315 A CN201510808315 A CN 201510808315A CN 105281826 A CN105281826 A CN 105281826A
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Abstract
The invention provides a system and a method for calibrating the receiving sensitivity of optical receiver components. The method for calibrating the receiving sensitivity of the optical receiver components comprises the steps of S1, testing the calibration values of the receiving sensitivity of the optical receiver components item by item according to each test data group to obtain each group of calibration values of the receiving sensitivity of the optical receiver components; S2, recording each group of calibration values item by item; S3, generating a calibration curve according to all the groups of calibration values. The method for calibrating the receiving sensitivity of the optical receiver components can test the bias voltage of the receiving sensitivity of the optical receiver components at different temperatures; by supplementing different voltages correspondingly at different temperatures, the sensitivity of the optical receiving components is kept stable.
Description
Technical field
The present invention relates to network service field tests, particularly relate to a kind of system and method for alignment light receiving unit receiving sensitivity.
Background technology
Passive optical-fiber network (PassiveOpticalNetwork: be called for short PON), it is a kind of fiber optic network not containing any electronic device and electronic power supply, compared with active soft exchange technology, PON is owing to eliminating the active equipment between local side and user side, thus make to safeguard simple, reliability is high, cost is low, and can save fiber resource.PON is primarily of the optical line terminal (OpticalLineTerminal of local side, OLT), optical distribution (OpticalDistributionNetwork, and the optical network unit (OpticalNetworkUnit of user side ODN), ONU) form, adopt optical fiber as transmission medium.Light transmitting-receiving subassembly wherein in optical network unit is mainly used in receiving and dispatching light, and luminescence is realized by light sending assembly, by becoming light signal to transmit in a fiber the transform electrical signals of modulation; Receive light to have been come by optical fiber receive module, by the optical signal amplification received is changed into the signal of telecommunication and passes to system again and carry out signal decoding process.
Due to the optical fiber receive module of current optical network unit, its receiving sensitivity is main relevant with the bias voltage of component internal circuit, but the bias voltage of optical fiber receive module is unstable at different temperature, therefore directly affect the receiving sensitivity of optical fiber receive module, cause the transmission of light signal unstable.
Summary of the invention
The problem of receiving sensitivity instability is there is for existing optical fiber receive module, a kind of receiving sensitivity being intended to realize test light receiving unit is now provided, obtain calibration curve, with the system and method for the alignment light receiving unit receiving sensitivity of stable receiving sensitivity.
Concrete technical scheme is as follows:
A system for alignment light receiving unit receiving sensitivity, provides and organizes test data set more, and often organize described test data set and comprise probe temperature, measuring current and luminous power, comprising:
One optical fiber receive module, is arranged in a temperature control box, in order to receive light;
The temperature of described sweat box, in order to according to described test data set, is adjusted to corresponding described probe temperature by described temperature control box;
One optical line terminal, in order to launch described light to described optical fiber receive module;
One optical attenuator, by Fiber connection between described optical line terminal and described optical fiber receive module, in order to according to described test data set, carries out optical power attenuation to the described light that described optical link is launched eventually;
One light power meter, by Fiber connection between described optical attenuator and described optical fiber receive module, in order to obtain the described luminous power of described light;
One adjustable power supply, with thinking that described optical fiber receive module is powered, and according to described test data set, is adjusted to corresponding described test voltage by the output voltage of described adjustable power supply;
One acquisition module, is connected between described power supply and described optical fiber receive module, in order to obtain the described calibration value of described optical fiber receive module receiving sensitivity;
One record cell, connects described acquisition module, often organizes described calibration value in order to itemize.
Preferably, also comprise:
One generation unit, connects described record cell, generates calibration curve in order to the described calibration value according to all groups.
Preferably, described adjustable power supply adopts adjustable DC power supply.
Preferably, described acquisition module comprises:
One voltmeter, is parallel to the two ends of described adjustable power supply, in order to measure the output voltage of described adjustable power supply;
One ammeter, is connected between described adjustable power supply and described optical fiber receive module, in order to measure the output current of described power supply.
Preferably, the adjustable extent of described adjustable power supply is at more than 60V, and degree of regulation is 0.001V.
Preferably, the test specification of described voltmeter is at more than 60V, and measuring accuracy is 0.001V.
Preferably, the test specification of described ammeter is between 0uA-50uA, and measuring accuracy is 0.001uA.
A kind of method of alignment light receiving unit receiving sensitivity, application is as the system of above-mentioned alignment light receiving unit receiving sensitivity, there is provided a memory cell in order to store the described test data set of many groups, often organize described test data set and comprise described probe temperature, described measuring current and described luminous power, comprise the steps:
S1. organize described test data set according to each to test the calibration value of the receiving sensitivity of described optical fiber receive module one by one, to obtain the described calibration value of often group of described optical fiber receive module receiving sensitivity;
S2. itemize often organizes described calibration value;
S3. calibration curve is generated according to the described calibration value of all groups.
Preferably, the detailed process obtaining the calibration value of optical fiber receive module receiving sensitivity described in a group in described step S1 is:
S11. test data set according to a group, regulates described optical attenuator to reach corresponding described luminous power in described test data set with the described luminous power making described optical fiber receive module export;
S12. according to described test data set, the temperature of described temperature control box is regulated to reach described probe temperature to make the temperature of described temperature control box;
S13. according to described test data set, regulate the output voltage of described adjustable power supply to reach voltage threshold to make described output voltage, and obtain the output current of described adjustable power supply;
S14. regulate the described output voltage of described adjustable power supply, to make described output current reach described measuring current, and record described output voltage and described test voltage, to obtain calibration value described in a group and described probe temperature and described test voltage.
Preferably, described voltage threshold is 15V.
Preferably, described luminous power is-30dBm.
Preferably, described in described step S13, measuring current is 13 times of output current described in described step S12.
The beneficial effect of technique scheme:
1) system of alignment light receiving unit receiving sensitivity is tested by the calibration value of the receiving sensitivity to optical fiber receive module, to obtain corresponding calibration value, to play calibration bias voltage, to stablize the object of receiving sensitivity;
2) method of alignment light receiving unit receiving sensitivity can test out the bias voltage of the receiving sensitivity of the optical fiber receive module under different temperatures, supplements different voltage by corresponding at different temperatures, keeps stable to make optical fiber receive module sensitivity.
Accompanying drawing explanation
Fig. 1 is the module map of a kind of embodiment of the system of alignment light receiving unit receiving sensitivity of the present invention;
Fig. 2 is the method flow diagram of a kind of embodiment of the method for alignment light receiving unit receiving sensitivity of the present invention;
Fig. 3 is the method flow diagram of the another kind of embodiment of the method for alignment light receiving unit receiving sensitivity of the present invention;
Fig. 4 is the calibration graph of a kind of embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
As shown in Figure 1, a kind of system of alignment light receiving unit receiving sensitivity, provides and organizes test data set more, and often organize test data set and comprise probe temperature, measuring current and luminous power, comprising:
One optical fiber receive module 16, is arranged in a temperature control box 15, in order to receive light;
The temperature of sweat box, in order to according to test data set, is adjusted to corresponding probe temperature by temperature control box 15;
One optical line terminal 11, in order to optical fiber receive module 16 emission of light;
One optical attenuator 12, by Fiber connection between optical line terminal 11 and optical fiber receive module 16, in order to according to test data set, carries out optical power attenuation to the light that optical link is launched eventually;
One light power meter 14, by Fiber connection between optical attenuator 12 and optical fiber receive module 16, in order to obtain the luminous power of light;
One adjustable power supply 18, with thinking that optical fiber receive module 16 is powered, and according to test data set, is adjusted to corresponding test voltage by the output voltage of adjustable power supply 18;
One acquisition module 17, is connected between power supply and optical fiber receive module 16, in order to obtain the calibration value of optical fiber receive module 16 receiving sensitivity;
One record cell, connects acquisition module 17, often organizes calibration value in order to itemize.
In the present embodiment, optical line terminal 11 in test cell 1 is core components of optical access network, be equivalent to the switch in traditional communication net or router, generally be placed on the optical fiber interface that local side provides user oriented passive optical-fiber network, send Ethernet data to optical network unit with broadcast mode; Attenuator in test cell 1 is the testing equipment for decaying to luminous power, it is mainly used in the occasions such as the index measurement of fibre system, the signal attenuation of short range communication systems and system test, and light signal energy expectedly can be decayed by the requirement of user by it.Tested by the calibration value of the receiving sensitivity of test cell 1 pair of optical fiber receive module 16, to obtain corresponding calibration value, to play calibration bias voltage, to stablize the object of receiving sensitivity.
In a preferred embodiment, also comprise:
One generation unit, linkage record unit, generates calibration curve in order to the calibration value according to all groups.
In a preferred embodiment, adjustable power supply 18 adopts adjustable DC power supply.
Further, the adjustable extent of adjustable power supply 18 is at more than 60V, and degree of regulation is 0.001V.
In a preferred embodiment, acquisition module 17 can comprise:
One voltmeter 171, is parallel to the two ends of adjustable power supply 18, in order to measure the output voltage of adjustable power supply 18;
One ammeter 172, is connected between adjustable power supply 18 and optical fiber receive module 16, in order to measure the output current of power supply.
Further, the test specification of voltmeter 171 is at more than 60V, and measuring accuracy is 0.001V; The test specification of ammeter 172 is between 0uA-50uA, and measuring accuracy is 0.001uA.
As shown in Figure 1, in the present embodiment, optical fiber receive module 16 is put into temperature control box 15, by receiving on optical fiber receive module 16 by thermo detector 13 probe; The PON mouth of optical line terminal 11 by Fiber connection to optical attenuator 12; Optical attenuator 12 is by the OLT mouth of Fiber connection to light power meter 14; The ONT mouth of light power meter 14 is by Fiber connection optical fiber receive module 16; Adjustable power supply 18+pole connect ammeter 172+pole and voltmeter 171+pole; Ammeter 172-pole connects the Vapd pin of optical fiber receive module 16; Adjustable power supply 18-pole connect voltmeter 171-the GND pin of pole and optical fiber receive module 16.
As shown in Figure 2, a kind of method of alignment light receiving unit receiving sensitivity, application is as the system of above-mentioned alignment light receiving unit receiving sensitivity, there is provided a memory cell to organize test data set in order to store more, often organize test data set and comprise probe temperature, measuring current and luminous power, comprise the steps:
S1. one by one the calibration value of the receiving sensitivity of optical fiber receive module 16 is tested according to each group test data set, to obtain the often group calibration value of optical fiber receive module 16 receiving sensitivity;
S2. itemize often organizes calibration value;
S3. calibration curve is generated according to the calibration value of all groups.
In the present embodiment, by testing out the bias voltage of the receiving sensitivity of the optical fiber receive module 16 under different temperatures, supplementing different voltage by corresponding at different temperatures, keeping stable to make optical fiber receive module 16 sensitivity.
As shown in Figure 3, in a preferred embodiment, the detailed process obtaining the calibration value of one group of optical fiber receive module 16 receiving sensitivity is in step sl:
S11. according to one group of test data set, optical attenuator 12 is regulated to reach corresponding luminous power in test data set with the luminous power making optical fiber receive module 16 and export;
S12. according to test data set, the temperature of temperature control box 15 is regulated to reach probe temperature to make the temperature of temperature control box 15;
S13. according to test data set, regulate the output voltage of adjustable power supply 18 to reach voltage threshold to make output voltage, and obtain the output current of adjustable power supply 18;
S14. regulate the output voltage of adjustable power supply 18, to make output current reach measuring current, and record output voltage and test voltage, to obtain one group of calibration value and probe temperature and test voltage.
On technique scheme basis, further, voltage threshold is 15V.
On technique scheme basis, further, luminous power is-30dBm.
On technique scheme basis, further, measuring current is 13 times of output current in step S12 in step s 13.
In the present embodiment, the method for alignment light receiving unit receiving sensitivity is applied in the test environment put up, and by optical line terminal 11 to optical fiber receive module 16 long hair light, regulates the luminous power of optical fiber receive module 16 incident light for-30dBm by optical attenuator 12.At a certain temperature, regulate and provide the adjustable power supply 18 of bias voltage to make it export as 15V to optical fiber receive module 16, record output current now and bias current; Adjustment test voltage and bias voltage make measuring current reach the output current of 13 times, and adjustable power supply 18 output voltage values is now the bias voltage calibration value of the receiving sensitivity at this temperature.Regulate the ambient temperature of optical fiber receive module 16, repeat above test, many group voltage calibration values can be measured.
In following table, 5 groups of optical fiber receive module 16 calibration data records values are that example further illustrates:
As shown in Figure 1, after test environment, start temperature control box 15; Open adjustable power supply 18, the initial supply power voltage of optical fiber receive module 16 is set to 15V; Optical line terminal 11 is set, by light power meter 14 test light line terminal 11 whether normal luminous, then tests as follows:
Steps A 1. regulates optical attenuator 12, the luminous power that attenuate light line terminal 11 exports, and checks light power meter 14, makes light power meter 14 show value be-30dBm;
The temperature of temperature control box 15 is set to-40 DEG C by steps A 2., is checked the real time temperature of optical fiber receive module 16 by thermo detector 13, when thermo detector 13 display reaches-40 DEG C, performs steps A 3;
Steps A 3. checks the output voltage of adjustable power supply 18 by voltmeter 171, regulates adjustable power supply 18 to export 15V, then records the output current 0.877uA that ammeter 172 now shows;
Steps A 4. heightens the output voltage of adjustable power supply 18, and the electric current shown when ammeter 172 reaches 13 times of 0.877Ua, when namely measuring current is 11.401uA, records the test voltage 30.69V of now adjustable power supply 18; Now obtain the calibration value of a group (-40 DEG C, 30.69V).
Repeat 4 step A2 to steps A 4, by give temperature control box 15 arrange different probe temperature-10 DEG C, 25 DEG C, 55 DEG C, 85 DEG C, with it corresponding test voltage 36.26V, 41.18V, 44.20V, 47.03V can be obtained.
Above testing procedure obtains 5 groups of calibration values altogether, is respectively (-40 DEG C, 30.69V), (-10 DEG C, 36.26V), (25 DEG C, 41.18V), (55 DEG C, 44.20V), (85 DEG C, 47.03V).Corresponding calibration curve can be generated as shown in Figure 4 according to 5 groups of calibration values.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilizations specification of the present invention and diagramatic content and apparent change obtain in protection scope of the present invention.
Claims (12)
1. a system for alignment light receiving unit receiving sensitivity, is characterized in that, provides and organizes test data set more, and often organize described test data set and comprise probe temperature, measuring current and luminous power, comprising:
One optical fiber receive module, is arranged in a temperature control box, in order to receive light;
The temperature of described sweat box, in order to according to described test data set, is adjusted to corresponding described probe temperature by described temperature control box;
One optical line terminal, in order to launch described light to described optical fiber receive module;
One optical attenuator, by Fiber connection between described optical line terminal and described optical fiber receive module, in order to according to described test data set, carries out optical power attenuation to the described light that described optical link is launched eventually;
One light power meter, by Fiber connection between described optical attenuator and described optical fiber receive module, in order to obtain the described luminous power of described light;
One adjustable power supply, with thinking that described optical fiber receive module is powered, and according to described test data set, is adjusted to corresponding described test voltage by the output voltage of described adjustable power supply;
One acquisition module, is connected between described power supply and described optical fiber receive module, in order to obtain the described calibration value of described optical fiber receive module receiving sensitivity;
One record cell, connects described acquisition module, often organizes described calibration value in order to itemize.
2. the system of alignment light receiving unit receiving sensitivity as claimed in claim 1, is characterized in that, also comprise:
One generation unit, connects described record cell, generates calibration curve in order to the described calibration value according to all groups.
3. the system of alignment light receiving unit receiving sensitivity as claimed in claim 1, is characterized in that, described adjustable power supply adopts adjustable DC power supply.
4. the system of alignment light receiving unit receiving sensitivity as claimed in claim 1, it is characterized in that, described acquisition module comprises:
One voltmeter, is parallel to the two ends of described adjustable power supply, in order to measure the output voltage of described adjustable power supply;
One ammeter, is connected between described adjustable power supply and described optical fiber receive module, in order to measure the output current of described power supply.
5. the system of the alignment light receiving unit receiving sensitivity as described in claim 1 or 3, is characterized in that, the adjustable extent of described adjustable power supply is at more than 60V, and degree of regulation is 0.001V.
6. the system of alignment light receiving unit receiving sensitivity as claimed in claim 4, it is characterized in that, the test specification of described voltmeter is at more than 60V, and measuring accuracy is 0.001V.
7. the system of alignment light receiving unit receiving sensitivity as claimed in claim 4, it is characterized in that, the test specification of described ammeter is between 0uA-50uA, and measuring accuracy is 0.001uA.
8. the method for an alignment light receiving unit receiving sensitivity, apply the system of alignment light receiving unit receiving sensitivity as claimed in claim 1, it is characterized in that, there is provided a memory cell in order to store the described test data set of many groups, often organize described test data set and comprise described probe temperature, described measuring current and described luminous power, comprise the steps:
S1. organize described test data set according to each to test the calibration value of the receiving sensitivity of described optical fiber receive module one by one, to obtain the described calibration value of often group of described optical fiber receive module receiving sensitivity;
S2. itemize often organizes described calibration value;
S3. calibration curve is generated according to the described calibration value of all groups.
9. the method for alignment light receiving unit receiving sensitivity as claimed in claim 8, it is characterized in that, the detailed process obtaining the calibration value of optical fiber receive module receiving sensitivity described in a group in described step S1 is:
S11. test data set according to a group, regulates described optical attenuator to reach corresponding described luminous power in described test data set with the described luminous power making described optical fiber receive module export;
S12. according to described test data set, the temperature of described temperature control box is regulated to reach described probe temperature to make the temperature of described temperature control box;
S13. according to described test data set, regulate the output voltage of described adjustable power supply to reach voltage threshold to make described output voltage, and obtain the output current of described adjustable power supply;
S14. regulate the described output voltage of described adjustable power supply, to make described output current reach described measuring current, and record described output voltage and described test voltage, to obtain calibration value described in a group and described probe temperature and described test voltage.
10. the method for alignment light receiving unit receiving sensitivity as claimed in claim 9, it is characterized in that, described voltage threshold is 15V.
The method of 11. alignment light receiving unit receiving sensitivities as claimed in claim 9, it is characterized in that, described luminous power is-30dBm.
The method of 12. alignment light receiving unit receiving sensitivities as claimed in claim 9, is characterized in that, measuring current is 13 times of output current described in described step S12 described in described step S13.
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