WO2013042583A1 - 光パワーモニタ装置、方法及びプログラム - Google Patents
光パワーモニタ装置、方法及びプログラム Download PDFInfo
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- WO2013042583A1 WO2013042583A1 PCT/JP2012/073209 JP2012073209W WO2013042583A1 WO 2013042583 A1 WO2013042583 A1 WO 2013042583A1 JP 2012073209 W JP2012073209 W JP 2012073209W WO 2013042583 A1 WO2013042583 A1 WO 2013042583A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
- H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
- H03F3/087—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light with IC amplifier blocks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J2001/4446—Type of detector
- G01J2001/446—Photodiode
- G01J2001/4466—Avalanche
Definitions
- the present invention relates to an optical power monitor device used for optical communication, and more particularly to an optical power monitor device characterized by an offset correction circuit.
- the avalanche photodiode is abbreviated as “APD (Avalanche Photo Diode)”.
- Patent Documents 1 and 2 will be described as related techniques of an optical power monitoring apparatus using an APD.
- Patent Document 1 discloses an APD bias voltage control circuit.
- the APD bias voltage control circuit includes an optical receiver that receives an optical signal by the APD and converts it into an electrical signal, and an APD bias voltage controller that provides an optimum bias voltage to the APD.
- the APD bias voltage control unit includes a DC voltage source that can control the output voltage, a variable resistor connected between the DC voltage source and the APD, and a CPU that performs various controls.
- the variable resistor is connected in series with the APD and applies a bias voltage to the APD.
- Patent Document 2 discloses an optical receiver using an APD as a light receiving element.
- the optical receiver calculates a multiplication factor corresponding to the input optical signal strength of the APD, and divides the value obtained by simply voltage-converting the APD current by the calculated value to obtain the difference between the input optical signal strength and the input optical signal voltage. The relationship is linearized.
- JP 2004-289206 A (summary, FIG. 1 etc.)
- the optical power monitoring apparatus using the APD is widely used in the field of optical communication and the like.
- This optical power monitor device is required to have higher speed and higher accuracy.
- an object of the present invention is to provide an optical power monitor device and the like that solves the further increase in speed and accuracy, which are the problems described above.
- the optical power monitor device is A photodiode that converts received light power into current; A resistor connected in parallel to the photodiode; A current mirror circuit that detects a value corresponding to the sum of the current flowing through the resistor and the current flowing through the photodiode as a first current value; A value corresponding to the current flowing through the resistor is stored in advance as a second current value, and the current flows through the photodiode based on the second current value and the first current value detected by the current mirror circuit.
- a control unit for obtaining a current It is equipped with.
- An optical power monitoring method includes: A photodiode that converts received light power into current; A resistor connected in parallel to the photodiode; A current mirror circuit that detects a value corresponding to the sum of the current flowing through the resistor and the current flowing through the photodiode as a first current value; An optical power monitoring method for use in an apparatus comprising: A value corresponding to the current flowing through the resistor is stored in advance as a second current value, and the current flows through the photodiode based on the second current value and the first current value detected by the current mirror circuit. The current is obtained.
- the optical power monitor program is: A photodiode that converts received light power into current; A resistor connected in parallel to the photodiode; A current mirror circuit that detects a value corresponding to the sum of the current flowing through the resistor and the current flowing through the photodiode as a first current value; A memory and a microprocessor; An optical power monitor program used for an apparatus equipped with The memory stores a value corresponding to the current flowing through the resistor as a second current value in advance, A function of inputting the second current value stored in the memory and the first current value detected by the current mirror circuit; Based on the input second current value and the first current value, a function for obtaining a current flowing through the photodiode; Is realized by the microprocessor.
- the response speed of the current mirror circuit can be improved by connecting a resistor in parallel to the photodiode, and the current flowing in the photodiode can be reduced by storing the current flowing in the resistor in advance. It can be determined accurately. Therefore, according to the present invention, it is possible to achieve higher speed and higher accuracy in the optical power monitor.
- FIG. 1 is a circuit diagram showing an optical power monitor device according to an embodiment of the present invention. It is a graph which shows the relationship (1st relationship) between the temperature of APD and the electric current which flows into the resistor for bias in embodiment. It is a graph which shows the relationship (2nd relationship) between the temperature of APD and the applied voltage of APD in embodiment. It is a graph which shows the relationship between the power received by APD and the electric current which flows into APD in embodiment. It is a flowchart which shows an example of operation
- FIG. 1 is a circuit diagram showing an optical power monitoring apparatus according to an embodiment of the present invention. Hereinafter, the description will be made with reference to the graphs of FIGS.
- the optical power monitoring device 10 of the present embodiment has an APD 11 as a photodiode that converts received light power P into a current Iapd, a resistor 12 connected in parallel to the APD 11, a current Irb that flows through the resistor 12, and a current that flows through the APD 11.
- a current mirror circuit 13 that detects a value corresponding to the sum of the current Iapd as the first current value I1 and a control unit 14 are provided.
- the control unit 14 stores in advance a value corresponding to the current Irb flowing through the resistor 12 as the second current value I2, and the second current value I2 and the first current value I1 detected by the current mirror circuit 13 Based on the above, the current Iapd flowing through the APD 11 is obtained. For example, when k is a constant, the first current value I1 is k ⁇ (Irb + Iapd), and the second current value I2 is k ⁇ Irb.
- the time required for the current mirror circuit 13 to rise can be shortened by continuously supplying the constant current Irb to the resistor 12, so that the response speed of the current mirror circuit 13 can be improved.
- the current Iapd flowing through the APD 11 can be accurately obtained by storing the second current value I2 in advance.
- the response speed of the current mirror circuit 13 can be improved by connecting the resistor 12 to the APD 11 in parallel, and the current Irb flowing through the resistor 12 is stored in advance.
- the current Iapd flowing through the APD 11 can be accurately obtained, so that further increase in speed and accuracy in the optical power monitor can be achieved.
- the APD 11 has a temperature characteristic that when a constant reverse bias voltage is applied, the multiplication factor decreases as the temperature increases. This is because when the temperature rises, the vibration of the crystal lattice becomes intense, so that the collision frequency of the accelerated carriers increases.
- the second current value I2 is a single value.
- the output of the APD 11 may be stabilized by changing the voltage applied to the APD 11 in accordance with the change in the temperature of the APD 11. In that case, the second current value I2 has a plurality of values.
- the optical power monitoring apparatus 10 of this embodiment further includes a temperature sensor 15 that detects the temperature T of the APD 11.
- the control unit 14 stores in advance the relationship between the temperature T detected by the temperature sensor 15 and the second current value I2 as the first relationship (FIG. 2), and the temperature detected by the temperature sensor 15.
- the second current value I2 corresponding to T is obtained from the first relationship (FIG. 2), and the current Iapd flowing through the APD 11 is obtained using this second current value I2.
- the optical power monitoring apparatus 10 of this embodiment further includes an APD driving power source 16 as a power source that applies the voltage Vapd to the APD 11 and the resistor 12 and changes the voltage Vapd by the control signal V1 from the control unit 14. .
- the control unit 14 stores in advance the relationship between the temperature T detected by the temperature sensor 15 and the voltage Vapd applied to the APD 11 as the second relationship (FIG. 3), and is detected by the temperature sensor 15.
- a voltage Vapd corresponding to the temperature T is obtained from the second relationship (FIG. 3), and a control signal V1 is output to the APD drive power supply 16 so as to output this voltage Vapd.
- the first relationship (FIG. 2) takes into account the change of the second current value I2 when the voltage Vapd changes corresponding to the temperature T detected by the temperature sensor 15.
- the resistor 12 applies a bias voltage to the APD 11.
- One end of the resistor 12 is connected to the cathode of the APD 11 and the other end is grounded, so that the voltage drop is applied to the APD 11.
- the current mirror circuit 13 is a general circuit composed of P-channel bipolar transistors 131 and 132.
- the transistors 131 and 132 have the same characteristics, and the emitters and bases are connected.
- the base and collector of the transistor 131 are connected.
- the control unit 14 is a computer having an MPU (Micro Processing Unit) 141 and a memory 142.
- the temperature sensor 15 detects the temperature of the APD 11 directly or indirectly.
- the APD drive power supply 16 is a general DC voltage power supply, and the output voltage can be changed by a computer or the like.
- As the photodiode a PIN photodiode or the like can be used instead of the APD 11.
- the optical power monitoring apparatus 10 of this embodiment can also be called an optical module having a receiving function.
- a resistor 18 is connected between the input and output of the TIA 17.
- the TIA 17, the resistor 18, and the LIM 19 are provided on the anode side of the APD 11, and the current-voltage conversion circuit 20 and the AD converter 21 are provided between the current mirror circuit 13 and the MPU 141.
- the bias resistor 12 is used to speed up the response of the current mirror circuit 13.
- the received light power P is converted into a current Iapd by the APD 11.
- the current mirror circuit 13 outputs a current proportional to the sum of the current Iapd flowing through the APD 11 and the current Irb flowing through the resistor 12 to the current-voltage conversion circuit 20.
- the current-voltage conversion circuit 20 converts the current into a voltage and outputs it to the AD converter 21.
- the AD converter 21 converts the voltage into a digital value and passes it to the MPU 141 as the first current value I1.
- the MPU 141 holds a second current value I2 corresponding to the current Irb flowing through the resistor 12 in the memory 142 in advance. Therefore, the MPU 141 can detect only the current Iapd flowing through the APD 11 by taking the difference between the first current value I1 that is the read value of the AD converter 21 and the second current value I2. Since the current Iapd flowing through the APD 11 and the light receiving power P have a correlation (FIG. 4), the light receiving power P can be accurately restored by storing this relationship in the memory 142 beforehand. That is, by storing the second current value I2 corresponding to the current Irb flowing through the resistor 12 in the memory 142 in advance, the received light power P input by the APD 11 can be accurately measured.
- the present embodiment adopts the bias resistor 12 as the simplest and cheapest means for accelerating the response of the current mirror circuit 13 and reduces the offset due to the current Irb flowing through the resistor 12 as its drawback. By correcting, it is possible to improve the accuracy of the received light power monitor.
- the offset correction circuit of the optical power monitor of the present embodiment is a circuit that easily corrects an offset generated when the received light power P is measured in an optical module having a reception function using the APD 11. is there.
- the received light power P is converted into current Iapd by the APD 11.
- the bias resistor 12 is used to increase the response speed of the current mirror circuit 13. That is, the instantaneous responsiveness of the current mirror circuit 13 can be improved by passing the current Irb to the current mirror circuit 13 in a fixed manner using the resistor 12.
- the resistance value of the resistor 12 is Rb
- the current Irb flowing through the resistor 12 is expressed by Vapd / Rb.
- the voltage Vapd is a reverse bias voltage applied to the APD 11 and is supplied from the APD drive power supply 16.
- the positive correlation between the received light power P and the current Iapd flowing through the APD 11 has a feature that varies depending on the temperature T around the APD 11. Therefore, in order to keep this correlation constant, it is necessary to change the voltage Vapd according to the ambient temperature T as shown in FIG.
- the current mirror circuit 13 outputs a current proportional to the sum of the current Iapd flowing through the APD 11 and the current Irb flowing through the resistor 12. The output current is converted into a voltage by the current-voltage conversion circuit 20 and input to the AD converter 21. Finally, k ⁇ (Iapd + Irb) multiplied by a constant k determined by the entire circuit of the current mirror circuit 13, the current-voltage conversion circuit 20, and the AD converter 21 is taken into the MPU 141 as the first current value I1.
- the received light power P input by the APD 1 is demodulated into an electric signal Data by the TIA 17 and the LIM 19.
- This is a basic function of the optical module and is not directly related to the present embodiment.
- the current Iapd flowing through the APD 11, that is, the light receiving power P can be measured by correcting the offset fluctuation due to the current Irb flowing through the resistor 12.
- the first effect of this embodiment is that the accuracy of the received light power monitor can be improved by correcting the offset due to the current flowing through the resistor 12.
- the second effect of the present embodiment is that an inexpensive and small fixed resistor (resistor 12) can be used as a current source for improving the response of the current mirror circuit 13.
- the optical power monitoring method of the present embodiment captures the operation of the optical power monitoring device 10 of the present embodiment as a method invention.
- the APD 11 as a photodiode that converts the received light power P into the current Iapd, the resistor 12 connected in parallel to the APD 11, the currents Irb and APD 11 flowing through the resistor 12, It is used in an optical power monitor device 10 having a current mirror circuit 13 that detects a value corresponding to the sum of the flowing current Iapd as a first current value I1.
- a value corresponding to the current Irb flowing through the resistor 12 is stored in advance as the second current value I2, and the second current value I2 and the current mirror circuit 13 detect the value. Based on the first current value I1, the current Iapd flowing through the APD 11 is obtained.
- the optical power monitoring device 10 further includes a temperature sensor 15 that detects the temperature T of the APD 11, the relationship between the temperature T detected by the temperature sensor 15 and the second current value I ⁇ b> 2 is first set in advance ( 2), the second current value I2 corresponding to the temperature T detected by the temperature sensor 15 is obtained from the first relationship (FIG. 2), and the APD 11 is stored in the APD 11 using this second current value I2.
- the flowing current Iapd may be obtained.
- the optical power monitor device 10 further includes an APD drive power source 16 as a power source for applying the voltage Vapd to the resistor 12 and the photodiode 11 and changing the voltage Vapd by the control signal V1 from the outside
- the temperature sensor 15 Is stored in advance as a second relationship (FIG. 3)
- the voltage Vapd corresponding to the temperature T detected by the temperature sensor 15 is stored in the second relationship.
- the control signal V1 is output to the APD drive power supply 16 so as to output this voltage Vapd.
- the change in the second current value I2 when the voltage Vapd changes corresponding to the temperature T detected by the temperature sensor 15 is added to the first relationship (FIG. 2) in advance.
- optical power monitoring method of the present embodiment the same operations and effects as the optical power monitoring device 10 described above are exhibited.
- this program is for causing a computer to realize the operation of the control unit 14 of the optical power monitoring apparatus 10 of the present embodiment.
- the control unit 14 of the optical power monitoring apparatus 10 is composed of a computer having an MPU 141 and a memory 142.
- the program has a function of inputting the second current value I2 stored in the memory 142 and the first current value I1 detected by the current mirror circuit 13, and the input second current value I2 and first current value. This is for causing the MPU 141 to realize the function of obtaining the current Iapd flowing through the APD 11 based on I1.
- the function of inputting the value of the temperature T detected by the temperature sensor 15 and the first relationship (FIG. 2) stored in the memory and the second current value I2 corresponding to the input value of the temperature T are input.
- the function obtained from the first relationship (FIG. 2) and the function of obtaining the current Iapd flowing through the APD 11 using the obtained second current value I2 may be realized by the MPU 141.
- the MPU 141 may realize the function obtained from the relationship (FIG. 3) and the function of outputting the control signal V1 to the APD drive power supply 16 so as to output the obtained voltage Vapd.
- a change in the second current value I2 when the voltage Vapd changes corresponding to the temperature T detected by the temperature sensor 15 is taken into consideration in advance.
- FIG. 5 is a flowchart showing an example of the operation of the computer by this program. Hereinafter, a description will be given with reference to FIGS.
- the first relationship (FIG. 2) and the second relationship (FIG. 3) are input from the memory 142 (step 101).
- the temperature T is input from the temperature sensor 15 and the first current value I1 is input from the AD converter 21 (step 102).
- a second current value I2 is obtained from the temperature T and the first relationship (FIG. 2) (step 103). That is, the second current value I2 stored in the memory 142 is substantially input in steps 101 and 103.
- a current Iapd flowing through the APD 11 is obtained from the first current value I1 and the second current value I2 (step 104).
- a voltage Vapd to be applied to the APD 11 is obtained from the temperature T and the second relationship (FIG. 3) (step 105).
- the control signal V1 is output to the APD drive power supply 16 so as to output the voltage Vapd (step 106).
- steps 102 to 106 are repeated.
- steps 104 to 106 are executed after steps 102 to 103.
- steps 104 to 106 may be executed before steps 102 to 103, or steps 102 to 103 may be executed.
- steps 104 to 106 may be executed in combination. According to this program, the same operation and effect of the optical power monitoring device 10 described above are exhibited.
- this program may be recorded on a non-transitory storage medium such as an optical disk or a semiconductor memory.
- the program is read from the recording medium by a computer and executed.
- the present invention has been described with reference to each of the above embodiments, but the present invention is not limited to each of the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention. Further, the present invention includes a combination of some or all of the configurations of the above-described embodiments as appropriate.
- [Appendix 1] a photodiode for converting received light power into current; A resistor connected in parallel to the photodiode; A current mirror circuit that detects a value corresponding to the sum of the current flowing through the resistor and the current flowing through the photodiode as a first current value; A value corresponding to the current flowing through the resistor is stored in advance as a second current value, and the current flows through the photodiode based on the second current value and the first current value detected by the current mirror circuit.
- a control unit for obtaining a current An optical power monitoring device.
- Appendix 2 In the optical power monitor apparatus described in Appendix 1, A temperature sensor for detecting the temperature of the photodiode; The control unit stores in advance a relationship between the temperature detected by the temperature sensor and the second current value as a first relationship, and the second current value corresponding to the temperature detected by the temperature sensor. Is obtained from the first relationship, and the current flowing through the photodiode is obtained using the second current value.
- Optical power monitor device In the optical power monitor apparatus described in Appendix 1, A temperature sensor for detecting the temperature of the photodiode; The control unit stores in advance a relationship between the temperature detected by the temperature sensor and the second current value as a first relationship, and the second current value corresponding to the temperature detected by the temperature sensor. Is obtained from the first relationship, and the current flowing through the photodiode is obtained using the second current value.
- Optical power monitor device In the optical power monitor apparatus described in Appendix 1, A temperature sensor for detecting the temperature of the photodiode; The control unit stores in advance a
- a power source that applies a voltage to the resistor and the photodiode and changes the voltage according to a control signal from the control unit;
- the controller stores a relationship between a temperature detected by the temperature sensor and a voltage applied to the photodiode as a second relationship in advance, and the voltage corresponding to the temperature detected by the temperature sensor is stored. Obtaining from the second relationship, outputting the control signal to the power supply to output this voltage, Optical power monitor device.
- optical power monitor device In the optical power monitor device according to any one of Appendixes 1 to 3, The photodiode is an APD; Optical power monitor device.
- An optical power monitoring method for use in an apparatus comprising: A value corresponding to the current flowing through the resistor is stored in advance as a second current value, and the current flows through the photodiode based on the second current value and the first current value detected by the current mirror circuit. Find the current, Optical power monitoring method.
- the apparatus further comprises a temperature sensor for detecting the temperature of the photodiode;
- the relationship between the temperature detected by the temperature sensor and the second current value is stored in advance as a first relationship, and the second current value corresponding to the temperature detected by the temperature sensor is stored in the first relationship. Obtained from the relationship, this second current value is used to determine the current flowing through the photodiode.
- the apparatus further includes a power source that applies a voltage to the resistor and the photodiode and changes the voltage by an external control signal,
- the relationship between the temperature detected by the temperature sensor and the voltage applied to the photodiode is stored in advance as a second relationship, and the voltage corresponding to the temperature detected by the temperature sensor is stored in the second relationship.
- output the control signal to the power supply to output this voltage Optical power monitoring method.
- the apparatus further comprises a temperature sensor for detecting the temperature of the photodiode;
- the memory stores the relationship between the temperature detected by the temperature sensor and the second current value as a first relationship in advance, A function of inputting a temperature value detected by the temperature sensor and the first relationship stored in the memory; A function obtained from the first relationship in which the second current value corresponding to the input temperature value is input; A function of obtaining a current flowing through the photodiode using the obtained second current value;
- An optical power monitor program for causing the microprocessor to realize the above.
- the apparatus further comprises a power supply that applies a voltage to the resistor and the photodiode and changes the voltage according to a control signal from the microprocessor,
- the memory stores the relationship between the temperature detected by the temperature sensor and the voltage applied to the photodiode as a second relationship in advance, A function of inputting a temperature value detected by the temperature sensor and the second relationship stored in the memory; A function obtained from the second relationship in which the voltage corresponding to the input temperature value is input; A function of outputting the control signal to the power supply so as to output the obtained voltage;
- An optical power monitor program for causing the microprocessor to realize the above.
- the present invention is applicable to a technique for monitoring optical power in the field of optical communication, for example.
- Optical Power Monitor 11 APD (Photodiode) 12 Resistor 13 Current Mirror Circuit 131 Transistor 132 Transistor 14 Control Unit 141 MPU 142 Memory 15 Temperature Sensor 16 APD Drive Power Supply (Power Supply) 17 TIA 18 resistors 19 LIM 20 Current-voltage conversion circuit 21 AD converter
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Abstract
Description
受光パワーを電流に変換するフォトダイオードと、
このフォトダイオードに並列に接続された抵抗器と、
この抵抗器に流れる電流と前記フォトダイオードに流れる電流との和に対応する値を第一電流値として検出するカレントミラー回路と、
前記抵抗器に流れる電流に対応する値を第二電流値としてあらかじめ記憶しておき、この第二電流値と前記カレントミラー回路で検出された前記第一電流値とに基づき、前記フォトダイオードに流れる電流を求める制御部と、
を備えたものである。
受光パワーを電流に変換するフォトダイオードと、
このフォトダイオードに並列に接続された抵抗器と、
この抵抗器に流れる電流と前記フォトダイオードに流れる電流との和に対応する値を第一電流値として検出するカレントミラー回路と、
を備えた装置に用いられる光パワーモニタ方法であって、
前記抵抗器に流れる電流に対応する値を第二電流値としてあらかじめ記憶しておき、この第二電流値と前記カレントミラー回路で検出された前記第一電流値とに基づき、前記フォトダイオードに流れる電流を求めるものである。
受光パワーを電流に変換するフォトダイオードと、
このフォトダイオードに並列に接続された抵抗器と、
この抵抗器に流れる電流と前記フォトダイオードに流れる電流との和に対応する値を第一電流値として検出するカレントミラー回路と、
メモリ及びマイクロプロセッサと、
を備えた装置に用いられる光パワーモニタプログラムであって、
前記抵抗器に流れる電流に対応する値を第二電流値としてあらかじめ前記メモリが記憶しており、
前記メモリに記憶された前記第二電流値と前記カレントミラー回路で検出された前記第一電流値とを入力する機能と、
入力した前記第二電流値及び前記第一電流値に基づき、前記フォトダイオードに流れる電流を求める機能と、
を前記マイクロプロセッサに実現させるためのものである。
このフォトダイオードに並列に接続された抵抗器と、
この抵抗器に流れる電流と前記フォトダイオードに流れる電流との和に対応する値を第一電流値として検出するカレントミラー回路と、
前記抵抗器に流れる電流に対応する値を第二電流値としてあらかじめ記憶しておき、この第二電流値と前記カレントミラー回路で検出された前記第一電流値とに基づき、前記フォトダイオードに流れる電流を求める制御部と、
を備えた光パワーモニタ装置。
前記フォトダイオードの温度を検出する温度センサを更に備え、
前記制御部は、前記温度センサで検出される温度と前記第二電流値との関係をあらかじめ第一の関係として記憶しておき、前記温度センサで検出された温度に対応する前記第二電流値を前記第一の関係から得て、この第二電流値を用いて前記フォトダイオードに流れる電流を求める、
光パワーモニタ装置。
前記抵抗器及び前記フォトダイオードに電圧を印加するとともに前記制御部からの制御信号によって当該電圧を変える電源を更に備え、
前記制御部は、前記温度センサで検出される温度と前記フォトダイオードに印加する電圧との関係をあらかじめ第二の関係として記憶しておき、前記温度センサで検出された温度に対応する前記電圧を前記第二の関係から得て、この電圧を出力するように前記電源に前記制御信号を出力する、
光パワーモニタ装置。
前記第一の関係は、前記温度センサで検出された温度に対応して前記電圧が変化した場合における前記第二電流値の変化が加味されたものである、
光パワーモニタ装置。
前記フォトダイオードがAPDである、
光パワーモニタ装置。
このフォトダイオードに並列に接続された抵抗器と、
この抵抗器に流れる電流と前記フォトダイオードに流れる電流との和に対応する値を第一電流値として検出するカレントミラー回路と、
を備えた装置に用いられる光パワーモニタ方法であって、
前記抵抗器に流れる電流に対応する値を第二電流値としてあらかじめ記憶しておき、この第二電流値と前記カレントミラー回路で検出された前記第一電流値とに基づき、前記フォトダイオードに流れる電流を求める、
光パワーモニタ方法。
前記フォトダイオードの温度を検出する温度センサを前記装置が更に備えており、
前記温度センサで検出される温度と前記第二電流値との関係をあらかじめ第一の関係として記憶しておき、前記温度センサで検出された温度に対応する前記第二電流値を前記第一の関係から得て、この第二電流値を用いて前記フォトダイオードに流れる電流を求める、
光パワーモニタ方法。
前記抵抗器及び前記フォトダイオードに電圧を印加するとともに外からの制御信号によって当該電圧を変える電源を前記装置が更に備えており、
前記温度センサで検出される温度と前記フォトダイオードに印加する電圧との関係をあらかじめ第二の関係として記憶しておき、前記温度センサで検出された温度に対応する前記電圧を前記第二の関係から得て、この電圧を出力するように前記電源に前記制御信号を出力する、
光パワーモニタ方法。
前記温度センサで検出された温度に対応して前記電圧が変化した場合における前記第二電流値の変化を、あらかじめ前記第一の関係に加味しておく、
光パワーモニタ方法。
このフォトダイオードに並列に接続された抵抗器と、
この抵抗器に流れる電流と前記フォトダイオードに流れる電流との和に対応する値を第一電流値として検出するカレントミラー回路と、
メモリ及びマイクロプロセッサと、
を備えた装置に用いられる光パワーモニタプログラムであって、
前記抵抗器に流れる電流に対応する値を第二電流値としてあらかじめ前記メモリが記憶しており、
前記メモリに記憶された前記第二電流値と前記カレントミラー回路で検出された前記第一電流値とを入力する機能と、
入力した前記第二電流値及び前記第一電流値に基づき、前記フォトダイオードに流れる電流を求める機能と、
を前記マイクロプロセッサに実現させるための光パワーモニタプログラム。
前記フォトダイオードの温度を検出する温度センサを前記装置が更に備えており、
前記温度センサで検出される温度と前記第二電流値との関係をあらかじめ第一の関係として前記メモリが記憶しており、
前記温度センサで検出された温度の値及び前記メモリに記憶された前記第一の関係を入力する機能と、
入力した前記温度の値に対応する前記第二電流値を入力した前記第一の関係から得る機能と、
得られた前記第二電流値を用いて前記フォトダイオードに流れる電流を求める機能と、
を前記マイクロプロセッサに実現させるための光パワーモニタプログラム。
前記抵抗器及び前記フォトダイオードに電圧を印加するとともに前記マイクロプロセッサからの制御信号によって当該電圧を変える電源を前記装置が更に備えており、
前記温度センサで検出される温度と前記フォトダイオードに印加する電圧との関係をあらかじめ第二の関係として前記メモリが記憶しており、
前記温度センサで検出された温度の値及び前記メモリに記憶された前記第二の関係を入力する機能と、
入力した前記温度の値に対応する前記電圧を入力した前記第二の関係から得る機能と、
得られた前記電圧を出力するように前記電源に前記制御信号を出力する機能と、
を前記マイクロプロセッサに実現させるための光パワーモニタプログラム。
前記第一の関係は、前記温度センサで検出された温度に対応して前記電圧が変化した場合における前記第二電流値の変化があらかじめ加味されている、
光パワーモニタプログラム。
11 APD(フォトダイオード)
12 抵抗器
13 カレントミラー回路
131 トランジスタ
132 トランジスタ
14 制御部
141 MPU
142 メモリ
15 温度センサ
16 APD駆動電源(電源)
17 TIA
18 抵抗器
19 LIM
20 電流電圧変換回路
21 ADコンバータ
Claims (9)
- 受光パワーを電流に変換するフォトダイオードと、
このフォトダイオードに並列に接続された抵抗器と、
この抵抗器に流れる電流と前記フォトダイオードに流れる電流との和に対応する値を第一電流値として検出するカレントミラー回路と、
前記抵抗器に流れる電流に対応する値を第二電流値としてあらかじめ記憶しておき、この第二電流値と前記カレントミラー回路で検出された前記第一電流値とに基づき、前記フォトダイオードに流れる電流を求める制御部と、
を備えた光パワーモニタ装置。 - 請求項1記載の光パワーモニタ装置において、
前記フォトダイオードの温度を検出する温度センサを更に備え、
前記制御部は、前記温度センサで検出される温度と前記第二電流値との関係をあらかじめ第一の関係として記憶しておき、前記温度センサで検出された温度に対応する前記第二電流値を前記第一の関係から得て、この第二電流値を用いて前記フォトダイオードに流れる電流を求める、
光パワーモニタ装置。 - 請求項2記載の光パワーモニタ装置において、
前記抵抗器及び前記フォトダイオードに電圧を印加するとともに前記制御部からの制御信号によって当該電圧を変える電源を更に備え、
前記制御部は、前記温度センサで検出される温度と前記フォトダイオードに印加する電圧との関係をあらかじめ第二の関係として記憶しておき、前記温度センサで検出された温度に対応する前記電圧を前記第二の関係から得て、この電圧を出力するように前記電源に前記制御信号を出力する、
光パワーモニタ装置。 - 受光パワーを電流に変換するフォトダイオードと、
このフォトダイオードに並列に接続された抵抗器と、
この抵抗器に流れる電流と前記フォトダイオードに流れる電流との和に対応する値を第一電流値として検出するカレントミラー回路と、
を備えた装置に用いられる光パワーモニタ方法であって、
前記抵抗器に流れる電流に対応する値を第二電流値としてあらかじめ記憶しておき、この第二電流値と前記カレントミラー回路で検出された前記第一電流値とに基づき、前記フォトダイオードに流れる電流を求める、
光パワーモニタ方法。 - 請求項4記載の光パワーモニタ方法において、
前記フォトダイオードの温度を検出する温度センサを前記装置が更に備えており、
前記温度センサで検出される温度と前記第二電流値との関係をあらかじめ第一の関係として記憶しておき、前記温度センサで検出された温度に対応する前記第二電流値を前記第一の関係から得て、この第二電流値を用いて前記フォトダイオードに流れる電流を求める、
光パワーモニタ方法。 - 請求項5記載の光パワーモニタ方法において、
前記抵抗器及び前記フォトダイオードに電圧を印加するとともに外からの制御信号によって当該電圧を変える電源を前記装置が更に備えており、
前記温度センサで検出される温度と前記フォトダイオードに印加する電圧との関係をあらかじめ第二の関係として記憶しておき、前記温度センサで検出された温度に対応する前記電圧を前記第二の関係から得て、この電圧を出力するように前記電源に前記制御信号を出力する、
光パワーモニタ方法。 - 受光パワーを電流に変換するフォトダイオードと、
このフォトダイオードに並列に接続された抵抗器と、
この抵抗器に流れる電流と前記フォトダイオードに流れる電流との和に対応する値を第一電流値として検出するカレントミラー回路と、
メモリ及びマイクロプロセッサと、
を備えた装置に用いられる光パワーモニタプログラムであって、
前記抵抗器に流れる電流に対応する値を第二電流値としてあらかじめ前記メモリが記憶しており、
前記メモリに記憶された前記第二電流値と前記カレントミラー回路で検出された前記第一電流値とを入力する機能と、
入力した前記第二電流値及び前記第一電流値に基づき、前記フォトダイオードに流れる電流を求める機能と、
を前記マイクロプロセッサに実現させるための光パワーモニタプログラム。 - 請求項7記載の光パワーモニタプログラムにおいて、
前記フォトダイオードの温度を検出する温度センサを前記装置が更に備えており、
前記温度センサで検出される温度と前記第二電流値との関係をあらかじめ第一の関係として前記メモリが記憶しており、
前記温度センサで検出された温度の値及び前記メモリに記憶された前記第一の関係を入力する機能と、
入力した前記温度の値に対応する前記第二電流値を入力した前記第一の関係から得る機能と、
得られた前記第二電流値を用いて前記フォトダイオードに流れる電流を求める機能と、
を前記マイクロプロセッサに実現させるための光パワーモニタプログラム。 - 請求項8記載の光パワーモニタプログラムおいて、
前記抵抗器及び前記フォトダイオードに電圧を印加するとともに前記マイクロプロセッサからの制御信号によって当該電圧を変える電源を前記装置が更に備えており、
前記温度センサで検出される温度と前記フォトダイオードに印加する電圧との関係をあらかじめ第二の関係として前記メモリが記憶しており、
前記温度センサで検出された温度の値及び前記メモリに記憶された前記第二の関係を入力する機能と、
入力した前記温度の値に対応する前記電圧を入力した前記第二の関係から得る機能と、
得られた前記電圧を出力するように前記電源に前記制御信号を出力する機能と、
を前記マイクロプロセッサに実現させるための光パワーモニタプログラム。
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