CN101217310A - Optical power measuring device and method - Google Patents
Optical power measuring device and method Download PDFInfo
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- CN101217310A CN101217310A CN 200710304276 CN200710304276A CN101217310A CN 101217310 A CN101217310 A CN 101217310A CN 200710304276 CN200710304276 CN 200710304276 CN 200710304276 A CN200710304276 A CN 200710304276A CN 101217310 A CN101217310 A CN 101217310A
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Abstract
The embodiment of the invention relates to an optical power measuring device, which comprises a photoelectric converter that is used for converting the incoming optical signal into electricity current signal, a sampling resistance that is used for converting the electricity current signal into voltage signal, an amplifying unit that is used for amplifying the voltage signal, a power computation unit that is used for computing the optical power of the incoming ray according to the corresponding relationship between the amplified voltage signal and the actual optical power. The invention further relates to an optical power measuring method, which comprises the following steps of converting the incoming optical signal into the electricity current signal, converting the electricity current signal into the voltage signal, amplifying the voltage signal, computing the optical power of the incoming ray according to the corresponding relationship between the amplified voltage signal and the actual optical power. The optical power measuring device, an optical network unit and an optical circuit terminal of the embodiment of the invention implement quick optical power measurement, and the response time of the measurement device does not change along with the amount of the incoming optical power, furthermore, the optical power measuring device does not affect the receiving sensitivity of photoelectric modules.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of optical power measuring device and method.
Background technology
EPON (Passive Optical Network, hereinafter to be referred as: PON) technology is the optical fiber access technology of a kind of point to multiple spot, it is by optical line terminal (the Optical Line Terminal of office's side, hereinafter to be referred as: OLT), optical network unit (the Optical Network Unit of user side, hereinafter to be referred as: ONU) or Optical Network Terminal (Optical Network Terminal, be called for short: ONT) and Optical Distribution Network (Optical Distribution Network, hereinafter to be referred as: ODN) form.So-called " passive " is meant and do not contain any active electronic device and electronic power supply among the ODN that all be made up of optical branching device passive devices such as (Splitter), the cost of its management maintenance is lower.Shown in Figure 1A, be the structural representation of PON system, mainly adopted the topological structure of tree type.
Shown in Figure 1B, for PON system descending data send schematic diagram, in the PON system, OLT is a down direction to the data transfer direction of ONU, the employing time division multiplexing (Time DivisionMultiplexing, be called for short: TDM) mode, i.e. downlink data transmission is continuous, OLT with information continuous be broadcast to each ONU, each ONU selects one's own Data Receiving.Shown in Fig. 1 C, for PON system uplink data send schematic diagram, ONU is a up direction to the transfer of data of OLT, adopt time division multiple access (Time Division Multiple Access, be called for short: TDMA) mode, be that the upstream data transmission happens suddenly, different ONU take different ascending time slots, and a plurality of ONU share up link by time-multiplexed mode.The guard time interval that avoids conflict is arranged between each ascending time slot.
In the deployment and running of PON system, for fault origination point and the failure cause in the locator data transmission more accurately, all need to measure the luminous power of local emission and local reception at OLT and ONU end, variation by the luminous power size that measures detects the problem that may occur in light transmitting terminal and the transmission course.
Shown in Fig. 2 A, be existing luminous power testing circuit schematic diagram.Power supply 1 provides power supply by mirror current source 2 for optical-electric module 3.Mirror current source 2 is used for the photoelectric current on optical-electrical converter 31 branch roads of optical-electric module 3 is mirrored in the optical power measuring device 4; When in the optical-electrical converter 31 during no light signal incident, very faint by the current signal of mirror current source 2, the electric current that is mirrored in the optical power measuring device 4 is also very faint; When optical-electrical converter 31 had light signal incident, the current signal by mirror current source 2 can increase, and its amplitude of variation and incident optical power are directly proportional.The photoelectric current that incident optical signal produces enters data recovery/control circuit 32 through optical-electrical converter 31, realizes data recovery or gain controlling, guarantees the proper communication of PON.Optical power measuring device 4 is measured the optical power value of incident light.
In this luminous power testing circuit, the response time of mirror current source 2 is relevant with the size of incident optical power, and is big by the electric current of mirror current source 2 when incident optical power is big, and the response time is short; Incident optical power hour, little by the electric current of mirror current source 2, the response time is long.When need measuring fast the performance number of incident light, this luminous power testing circuit can't reach requirement.
Shown in Fig. 2 B, for existing luminous power detects another circuit diagram.Optical-electric module 3 ' provide power supply is provided power supply 1, optical-electrical converter 31 ' convert incident optical signal to current signal, current signal by data recovery circuit 32 ' in transimpedance amplifier (Trans Impedance Amplifier, hereinafter to be referred as: TIA) 321 ' amplify.TIA321 ' output two-way difference amplifying signal, one road input saturation amplifier (Limited Amplifier, hereinafter to be referred as: LA) 322 ' carrying out secondary amplifies, other one road input optical power measurement mechanism 4 ' carry out measuring light power.
Usually TIA321 ' import LA322 ' simultaneously with two paths of differential signals, and in this luminous power testing circuit, TIA321 ' only incites somebody to action road input LA322 ' wherein, other one tunnel input power measurement circuit 4 ' and, carry out measuring light power.Make the signal amplitude that enters LA322 ' reduce half like this, cause the receiving sensitivity of optical-electric module to descend, limited optical-electric module 3 ' the scope of application.
Summary of the invention
The embodiment of the invention provides a kind of optical power measuring device and method, under the situation that does not influence the optical-electric module receiving sensitivity, to realize the quick measurement to luminous power.
The embodiment of the invention provides a kind of optical power measuring device, comprising: optical-electrical converter is used for incident optical signal is converted to current signal; Sampling resistor is used for converting current signal to voltage signal; Amplifying unit is used to amplify this voltage signal; Power calculation unit is used for calculating the luminous power of incident light according to the voltage signal after amplifying and the corresponding relation of actual light power.
The embodiment of the invention provides a kind of optical power measurement method, comprising: incident optical signal is converted to current signal; Convert current signal to voltage signal; Amplify this voltage signal; According to the voltage signal after amplifying and the corresponding relation of actual light power, calculate the luminous power of incident light.
By above technical scheme as can be known, the optical power measuring device of the embodiment of the invention and method, realized measuring light power fast, the response time of measurement mechanism does not change with the size of incident optical power, and optical power measuring device can not exert an influence to the receiving sensitivity of optical-electric module.
Also in conjunction with the accompanying drawings the present invention is described in further detail below by specific embodiment.
Description of drawings
Figure 1A is the structural representation of PON system;
Figure 1B is that PON system descending data send schematic diagram;
Fig. 1 C is that PON system uplink data send schematic diagram;
Fig. 2 A is existing luminous power testing circuit schematic diagram;
Fig. 2 B detects another circuit diagram for existing luminous power;
Fig. 3 is the structural representation of optical power measuring device embodiment one of the present invention;
Fig. 4 A is the structural representation of optical power measuring device embodiment two of the present invention;
Fig. 4 B is another structural representation of optical power measuring device embodiment two of the present invention;
Fig. 5 is the structural representation of optical power measuring device embodiment three of the present invention;
Fig. 6 is the structural representation that the present invention includes the optical network unit embodiment of optical power measuring device;
Fig. 7 is the structural representation that the present invention includes the optical line terminal embodiment of optical power measuring device;
Fig. 8 is the schematic flow sheet of optical power measurement method embodiment of the present invention.
Embodiment
The scheme of the embodiment of the invention is the difference of incident optical signal power, the voltage difference at sampling resistor two ends is also different, by obtaining the voltage difference at sampling resistor two ends, again according to the corresponding relation of voltage difference and actual light power, calculate the luminous power numerical value of incident light, realize measuring light power.
As shown in Figure 3, be the structural representation of optical power measuring device embodiment one of the present invention, this optical power measuring device comprises: optical-electrical converter 8 is used for incident optical signal is converted to current signal; Sampling resistor 5 is used for converting current signal to voltage signal; Amplifying unit 6 is used for amplification voltage signal, is connected with sampling resistor 5; Power calculation unit 7 is used for calculating the luminous power of incident light according to the voltage signal after amplifying and the corresponding relation of actual light power, is connected with amplifying unit 6.
Its course of work is: the incident light of different capacity will produce the current signal of different sizes through optical-electrical converter 8, current signal is when passing through as the sampling resistor 5 among Fig. 3, can produce voltage difference at sampling resistor 5 two ends, its voltage difference is corresponding with incident optical power.Amplifying unit 6 is gathered voltage signal from sampling resistor 5, and it is amplified within the scope of be fit to measuring, voltage signal after amplifying is exported to power calculation unit 7, this power calculation unit 7 after according to wherein amplification of input voltage signal and the corresponding relation of actual light power, obtain incident optical power this moment.
The corresponding relation of above-mentioned voltage signal and actual light power is obtained by following mode.With one comparatively accurately the power measurement instrument measure the optical power value of a tunable light source, this tunable light source shines the optical-electrical converter 8 in the above-mentioned optical power measuring device, power calculation unit 7 obtains the corresponding voltage value of the optical power value of tunable light source output, get some exemplary voltages values and optical power value and make a magnitude of voltage/incident optical power value correspondence table, this process is called calibration process.When again this power calculation unit 7 being used to measure actual incident optical power, as long as find actual voltage value after the amplification according to above-mentioned correspondence table, correspondence finds optical power value to get final product again.Certainly, the actual voltage value of incident light after sampling is amplified can not find in correspondence table fully in the actual measurement, at this moment, can in this correspondence table, find between the actual voltage value location, utilize interpolation method to calculate the actual incident optical power value of this actual voltage value correspondence again.For example: magnitude of voltage as shown in Table 1/incident optical power value corresponding relation, when the actual voltage value that obtains is 1.3v, find its interval 1～2v in correspondence table, utilize method of equal proportion to calculate corresponding optical power value then, promptly
Actual light power is 1.06mW.The used interpolation algorithm that obtains actual light power can have multiple.
Table one:
| Magnitude of voltage/ |
1 | 2 | 3 | 4 |
| Optical power value/ |
1 | 1.2 | 1.8 | 2.4 |
In the present embodiment, the insertion of sampling resistor 5 does not influence the receiving sensitivity of light signal, and its response time can not change with the size of incident optical power yet, can realize measuring light power fast and accurately.
Shown in Fig. 4 A, structural representation for optical power measuring device embodiment two of the present invention, this optical power measuring device comprises above-mentioned optical-electrical converter 8, sampling resistor 5, amplifying unit 6 and power calculation unit 7, wherein amplifying unit 6 specifically comprises: NPN triode 61, be used to amplify the voltage signal of sampling resistor 5 conversions, the base stage of NPN triode 61, collector electrode are connected with the two ends of sampling resistor 5; Voltage-stabiliser tube 62 is used to reduce the pressure drop on the NPN triode 61, is connected with the emitter of NPN triode 61; One or more series resistors 63 are used for constituting with sampling resistor 5 and voltage-stabiliser tube 62 direct current biasing of NPN triodes 61, are connected in series mutually with voltage-stabiliser tube 62.
The course of work is: power supply is an optical-electrical converter 8, promptly avalanche photodide (AvalanchePhotodiode, hereinafter to be referred as: APD) 8 provide power supply, APD8 is converted to corresponding current signal with incident optical signal.Insert a sampling resistor 5 between power supply and APD8, its two ends connect the base stage and the collector electrode of a NPN triode 61 respectively.Be connected with voltage-stabiliser tube 62, resistance 631 and resistance 632 between the emitter of NPN triode 61 and the ground successively; Sampling resistor 5, resistance 631, resistance 632 and voltage-stabiliser tube 62 constitute the direct current biasing of NPN triode 61, make NPN triode 61 can be operated in the linear amplification district.Owing to need the voltage of 30～80V during the APD81 operate as normal, the voltage tolerance range that has surpassed General N PN triode 61, so need reduce pressure drop on the NPN triode 61 with voltage-stabiliser tube 62, and, reduce the power consumption of whole device by increasing voltage-stabiliser tube 62.Resistance 631 and resistance 632 are formed the emitter resistance of NPN triode 61, and the voltage signal after the amplification is from output between resistance 631 and the resistance 632.Adopt two resistance 631 and resistance 632, be because: the size of resistance 631 and resistance 632 resistance sums influences the dc point of NPN triode 61, alternative scope is very little, if adopt a resistance, its resistance might not match with back power calculation unit 7 required resistances, but after adopting two resistance, both can satisfy the requirement of working point to total resistance, again can be under the prerequisite that does not change total resistance, by changing the proportionate relationship between resistance 631 and the resistance 632, well mate the power calculation unit 7 of back.
During unglazed incident APD8, have only bias current to pass through on the sampling resistor 5, the voltage difference at its two ends is a fixed value, and NPN triode 61 is operated in the direct current biasing state; When light incident APD8 was arranged, the photoelectric current that APD8 produces changed the voltage difference at its two ends by sampling resistor 5, and the photoelectric current that variable quantity and incident optical signal produce is directly proportional.The variation of sampling resistor 5 both end voltage has changed the working point of NPN triode 61, and the electric current by resistance 631 and resistance 632 is changed, and the size of variable quantity and incident optical power is inversely proportional to.Voltage signal on the resistance 632 is sampled by the ADC71 in the power calculation unit 7; When MAC module 72 among the PON light incident light electric transducer if can being known accurately, so can be used for controlling the sampling time of ADC71; The ADC71 numerical value input RAM73 that will sample carries out buffer memory; Also can allow ADC71 the signal of input be sampled, MAC module 72 writing of RAM73 of control enable, and promptly only store the sampling numerical value that is used for measuring light power always; CPU74 reads the sampling numerical value of storing among the RAM73, according to the corresponding relation of this sampled digital signal value and actual light power, obtains the luminous power of incident light this moment.This corresponding relation also can obtain according to the mode of above-mentioned table one.
Shown in Fig. 4 B, another structural representation for optical power measuring device embodiment two of the present invention, this optical power measuring device comprises optical-electrical converter 8, sampling resistor 5, amplifying unit 6 and the power calculation unit 7 of the foregoing description one, wherein amplifying unit 6 specifically comprises: PNP triode 61 ', be used to amplify the voltage signal of sampling resistor 5 conversions, PNP triode 61 ' base stage, emitter be connected with the two ends of sampling resistor 5; Voltage-stabiliser tube 62 ', be used to reduce PNP triode 61 ' on pressure drop, with PNP triode 61 ' collector electrode be connected; One or more series resistors 63 ', be used for sampling resistor 5 and voltage-stabiliser tube 62 ' formation PNP triode 61 ' direct current biasing, with the serial connection of voltage-stabiliser tube 62 ' mutually.
The course of work is: power supply is an optical-electrical converter 8, promptly avalanche photodide (AvalanchePhotodiode, hereinafter to be referred as: APD) 8 provide power supply, APD8 is converted to corresponding current signal with incident optical signal.Between power supply and APD8, insert a sampling resistor 5, its two ends connect respectively a PNP triode 61 ' base stage and emitter.PNP triode 61 ' collector electrode and ground between be connected with successively voltage-stabiliser tube 62 ', resistance 631 ' and resistance 632 '; Sampling resistor 5, resistance 631 ', resistance 632 ' and voltage-stabiliser tube 62 ' formation PNP triode 61 ' direct current biasing, make PNP triode 61 ' can be operated in the linear amplification district.Owing to need the voltage of 30～80V during the APD8 operate as normal, surpassed general PNP triode 61 ' the voltage tolerance range, so need with voltage-stabiliser tube 62 ' reduce PNP triode 61 ' on pressure drop, and by increase voltage-stabiliser tube 62 ', reduced the power consumption of whole device.Resistance 631 ' and resistance 632 ' compositions PNP triode 61 ' collector resistance, the voltage signal after the amplification is from exporting between resistance 631 and the resistance 632.Adopt two resistance 631 ' and resistance 632 ', be because: resistance 631 ' and the size of resistance 632 ' resistance sum influence PNP triode 61 ' dc point, alternative scope is very little, if adopt a resistance, its resistance might not match with back power calculation unit 7 required resistances, but after adopting two resistance, both can satisfy the requirement of working point to total resistance, again can be under the prerequisite that does not change total resistance, by changing the proportionate relationship between resistance 631 and the resistance 632, well mate the power calculation unit 7 of back.
During unglazed incident APD8, have only bias current to pass through on the sampling resistor 5, the voltage difference at its two ends is a fixed value, PNP triode 61 ' be operated in direct current biasing state; When light incident APD8 was arranged, the photoelectric current that APD8 produces changed the voltage difference at its two ends by sampling resistor 5, and the photoelectric current that variable quantity and incident optical signal produce is directly proportional.The variation of sampling resistor 5 both end voltage, changed PNP triode 61 ' the working point, make by resistance 631 ' and resistance 632 ' electric current change, the size of variable quantity and incident optical power is inversely proportional to.Resistance 632 ' on voltage signal sampled by the ADC71 in the power calculation unit 7; When MAC module 72 among the PON light incident light electric transducer if can being known accurately, so can be used for controlling the sampling time of ADC71; The ADC71 numerical value of will sampling is sent into RAM73 and is carried out buffer memory; Also can allow ADC71 the signal of input be sampled, MAC module 72 writing of RAM73 of control enable, and promptly only store the sampling numerical value that is used for measuring light power always; CPU74 reads the sampled value of storing among the RAM73, according to the corresponding relation of this sampled digital signal value and actual light power, obtains the luminous power of incident light this moment.This corresponding relation also can obtain according to the mode of above-mentioned table one.
The triode amplifier that uses in the present embodiment is linear amplifier, and the multiplication factor of linear amplifier does not change with the size of incident optical power; The front and back of this amplifier can also connect the low pass filter (not shown), with the high-frequency noise in this optical power measuring device of filtering, guarantee the accuracy of measuring light power.
As shown in Figure 5, structural representation for optical power measuring device embodiment three of the present invention, this optical power measuring device comprises above-mentioned optical-electrical converter 8, sampling resistor 5, amplifying unit 6 and power calculation unit 7, wherein amplifying unit 6 specifically comprises: sampling resistor 5 two ends are connected in series electric capacity 64 (being two electric capacity in the present embodiment) respectively, electric capacity 64 is used for the high direct voltage composition of filtering sampling resistor 5 both end voltage signals, and the voltage small-signal that allows to exchange passes through; Logarithmic amplifier 65 is used to amplify the voltage signal of sampling resistor 5 conversions, and two inputs are connected with the other end of the electric capacity 64 of sampling resistor 5 two ends serial connection respectively.
Power supply provides power supply for APD8, and APD8 is converted to corresponding current signal with the light signal of incident.Insert sampling resistor 5 between power supply and the APD8, the two ends of sampling resistor 5 connect the input of logarithmic amplifier 65 respectively by two electric capacity 64.Owing to need the voltage of 30～80V during the APD8 operate as normal, surpassed the voltage tolerance range of general IC chip, therefore need with the high direct voltage composition in electric capacity 64 filtered signals, the voltage small-signal that only allows to exchange passes through.
During unglazed incident APD8, APD8 does not produce photoelectric current, and sampling resistor 5 both end voltage differences are very little, stable magnitude of voltage of logarithmic amplifier 65 outputs.When light incident APD is arranged, the photoelectric current that APD8 produces produces voltage difference at the two ends of sampling resistor 5, voltage signal is by two electric capacity 64, be coupled into two inputs of logarithmic amplifier 65 respectively, logarithmic amplifier 65 amplifies this differential signal, export a voltage signal that changes with incident optical power, this voltage signal is sampled by the ADC71 in the power calculation unit 7.Whether the MAC module 72 among the PON is accurately known light incident this moment, and by control ADC71 or RAM73, record needs sampling numerical value constantly; The CPU74 numerical value of will sampling is read from RAM73, according to the corresponding relation of sampling numerical value and actual light power, obtains the luminous power of incident light this moment.This corresponding relation also can obtain according to the mode of above-mentioned table one.
The logarithmic amplifier that adopts in the present embodiment is at incident optical power hour, and multiplication factor is big, and when incident optical power was big, multiplication factor was little, the measuring light power precision in the time of can improving small-power like this.
Optical power measuring device in the embodiment of the invention can be integrated in optical network unit or the optical line terminal.
As shown in Figure 6, be the structural representation of the optical network unit embodiment that the present invention includes optical power measuring device.Include data recovery/control circuit 9 in this optical network unit ONU.Also comprise in this optical network unit ONU:
Optical-electrical converter 8 is used for incident optical signal is converted to current signal; Sampling resistor 5 is used for converting the current signal of optical-electrical converter 8 conversions to voltage signal; Amplifying unit 6 is used to amplify the voltage signal of input, is connected with sampling resistor 5; Power calculation unit 7 is used for calculating the luminous power of incident light according to the voltage signal after amplifying and the corresponding relation of actual light power, is connected with amplifying unit 6.
Wherein sampling resistor 5 is connected with optical-electrical converter 8, and optical-electrical converter 8 is connected with data recovery/control circuit 9, and data recovery/control circuit 9 recovers or gain controlling in order to realize data.
Specifically can comprise in above-mentioned power calculation unit 7: analog to digital converter ADC71 is used for the voltage signal after amplifying is carried out mould/number conversion output sampling numerical value; Memory cell RAM73 is used for store sample numerical value; Central processing unit CPU 74 is used for the luminous power that the sampling numerical value and the corresponding relation of actual light power according to storage obtain incident light.
In the present embodiment, the insertion of sampling resistor 5 does not influence the normal recovery and the control of 9 pairs of data of data recovery/control circuit, to the not influence of sensitivity of optical-electrical converter 8; The response time of sampling resistor 5 does not change with the size of incident optical power yet, so can realize the quick response of measuring light power.
As shown in Figure 7, be the structural representation of the optical line terminal embodiment that the present invention includes optical power measuring device.Include data recovery/control circuit 9 in this optical line terminal OLT.Also comprise in this optical line terminal OLT:
Optical-electrical converter 8 is used for incident optical signal is converted to current signal; Sampling resistor 5 is used for converting the current signal of optical-electrical converter 8 conversions to voltage signal; Amplifying unit 6 is used to amplify the voltage signal of input, is connected with sampling resistor 5; Power calculation unit 7 is used for calculating the luminous power of incident light according to the voltage signal after amplifying and the corresponding relation of actual light power, is connected with amplifying unit 6.
Wherein sampling resistor 5 is connected with optical-electrical converter 8, and optical-electrical converter 8 is connected with data recovery/control circuit 9, and data recovery/control circuit 9 recovers or gain controlling in order to realize data.
Specifically can comprise in above-mentioned power calculation unit 7: analog to digital converter ADC71 is used for the voltage signal after amplifying is carried out mould/number conversion output sampling numerical value; Memory cell RAM73 is used for store sample numerical value; Central processing unit CPU 74 is used for the luminous power that the sampling numerical value and the corresponding relation of actual light power according to storage obtain incident light.
In the present embodiment, the insertion of sampling resistor 5 does not influence the normal recovery and the control of 82 pairs of data of data recovery/control circuit, to the not influence of sensitivity of optical-electrical converter 8; The response time of sampling resistor 5 does not change with the size of incident optical power yet, so can realize the quick response of measuring light power.
As shown in Figure 8, be the schematic flow sheet of optical power measurement method embodiment of the present invention, concrete steps are as follows:
This current signal sampling resistor of flowing through,, obtain the voltage difference signal from the two ends of sampling resistor, thereby obtain voltage signal;
Voltage signal is amplified the method that the concrete method that can take linear amplification or logarithm amplify.And, adopt logarithm to amplify, at incident optical power hour, multiplication factor is big, and when incident optical power was big, multiplication factor was little, the precision of the measuring light power in the time of can improving small-power;
Step 104 can utilize as shown in Table 1 voltage signal and the corresponding relation of actual light power, calculate the luminous power of incident light, specifically can also be divided into following steps:
Step 1041, the voltage signal after amplifying is carried out mould/number conversion, output sampling numerical value;
Step 1042, store sample numerical value;
Step 1043, the luminous power that obtains incident light according to the sampling numerical value and the corresponding relation of actual light power of storage.
The optical power measurement method of present embodiment, sampling by sampling resistor obtains the voltage signal corresponding with the light signal of incident light, do not influence of normal recovery and the control of other circuit of sampling back, to the also not influence of sensitivity of opto-electronic conversion to the data of incident optical signal; The response time of sampling resistor does not change with the size of incident optical power yet, so can realize the quick response of measuring light power.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (14)
1. an optical power measuring device is characterized in that, comprising:
Optical-electrical converter is used for incident optical signal is converted to current signal;
Sampling resistor is used for converting described current signal to voltage signal;
Amplifying unit is used to amplify described voltage signal;
Power calculation unit is used for the corresponding relation according to voltage signal after the described amplification and actual light power, calculates the luminous power of described incident light.
2. optical power measuring device according to claim 1 is characterized in that, the voltage difference signal of described voltage signal for obtaining from described sampling resistor two ends.
3. optical power measuring device according to claim 1 and 2 is characterized in that, described amplifying unit is linear amplification unit or logarithm amplifying unit.
4. optical power measuring device according to claim 3 is characterized in that, described linear amplification unit comprises:
Triode is used to amplify the described voltage signal of described sampling resistor conversion, and the two ends of described triode are connected with the two ends of described sampling resistor respectively.
5. optical power measuring device according to claim 4 is characterized in that, described linear amplification unit also comprises:
Voltage-stabiliser tube is used to reduce the pressure drop of described triode, and an end of described voltage-stabiliser tube is connected with the 3rd end of described triode;
One or more series resistors are used for constituting with described sampling resistor and described voltage-stabiliser tube the direct current biasing of described triode, are connected in series mutually with the other end of described voltage-stabiliser tube.
6. optical power measuring device according to claim 3 is characterized in that, described logarithm amplifying unit comprises:
Logarithmic amplifier is used for that described voltage signal is carried out logarithm and amplifies.
7. optical power measuring device according to claim 6 is characterized in that, described logarithm amplifying unit also comprises:
A plurality of electric capacity are used for the high direct voltage signal of the described sampling resistor both end voltage of filtering signal, and the voltage small-signal that allows to exchange passes through, and described a plurality of electric capacity are serially connected with the two ends of described sampling resistor respectively, are connected with two inputs of described logarithmic amplifier.
8. according to claim 1,2,4,5,6 or 7 described optical power measuring devices, it is characterized in that described power calculation unit comprises:
Analog to digital converter is used for the voltage signal after the described amplification is carried out mould/number conversion, output sampling numerical value;
Memory cell is used to store described sampling numerical value;
CPU is used for obtaining according to the corresponding relation of the sampling numerical value of described storage and described actual light power the luminous power of described incident light.
9. optical power measuring device according to claim 8 is characterized in that described power calculation unit also comprises:
Medium access control module is used to control the voltage signal of described analog to digital converter after to described amplification and carries out the time of mould/number conversion, or controls the time of the described sampling numerical value of described cell stores.
10. according to claim 1,2,4,5,6,7 or 9 described optical power measuring devices, it is characterized in that described optical power measuring device is integrated in optical network unit or the optical line terminal.
11. an optical power measurement method is characterized in that, comprising:
Incident optical signal is converted to current signal;
Convert described current signal to voltage signal;
Amplify described voltage signal;
According to the corresponding relation of voltage signal after the described amplification and actual light power, calculate the luminous power of described incident light.
12. optical power measurement method according to claim 11 is characterized in that, describedly converts described current signal to voltage signal and comprises: the sampling resistor two ends of flowing through from described current signal obtain the voltage difference signal, obtain described voltage signal.
13. optical power measurement method according to claim 11 is characterized in that, the described voltage signal of described amplification comprises: linear amplification or logarithm amplify described voltage signal.
14. according to claim 11,12 or 13 described optical power measurement methods, it is characterized in that, described corresponding relation according to voltage signal after the described amplification and actual light power, the luminous power of calculating described incident light comprises:
Voltage signal after the described amplification is carried out mould/number conversion, output sampling numerical value;
Store described sampling numerical value;
Obtain the luminous power of described incident light according to the corresponding relation of the sampling numerical value of described storage and described actual light power.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710304276 CN101217310B (en) | 2007-12-26 | 2007-12-26 | Optical power measuring device and method |
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