CN103997369A - Monitoring method of variable gain burst receiving optical power monitoring circuit, and variable gain burst receiving optical power monitoring circuit - Google Patents
Monitoring method of variable gain burst receiving optical power monitoring circuit, and variable gain burst receiving optical power monitoring circuit Download PDFInfo
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- CN103997369A CN103997369A CN201410126500.XA CN201410126500A CN103997369A CN 103997369 A CN103997369 A CN 103997369A CN 201410126500 A CN201410126500 A CN 201410126500A CN 103997369 A CN103997369 A CN 103997369A
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Abstract
The invention relates to a monitoring method of a variable gain burst receiving optical power monitoring circuit, and the variable gain burst receiving optical power monitoring circuit. At present, a burst receiving optical power monitoring circuit applied to an EPON OLT (Ethernet Passive Optical Network Optical Line Terminal) optimal module and a GPON OLT (Gigabit Passive Optical Network Optical Line Terminal) optimal module is single in function. The monitoring method provided by the invention comprises the steps that: in an original state, the gain of the variable gain burst receiving optical power monitoring circuit is (1+(Rf0/Rf)), and for unknown input optical power, when an external trigger signal is input, if an ADC (Analog to Digital Converter) value detected by using the trigger signal is larger than a preset value AD_-25, an MCU (Microprogrammed Control Unit) performs a gain changing operation by which an analog switch SW1 is closed, so that the gain is changed into (1+((Rf0//Rf1)/Rf)), and the monitoring circuit is switched into a high-input-light amplification circuit state; and if the ADC value detected by using the trigger signal is smaller than the preset value AD_-25, the MCU does not perform the gain changing operation, and the analog switch SW1 is not closed, so that the gain value is not changed and is kept to be (1+(Rf0/Rf)), and the monitoring circuit is switched into a low-input-light amplification circuit state. The monitoring method is used for monitoring receiving optical power of a burst receiving machine.
Description
Technical field:
The present invention relates to a kind of monitoring method and observation circuit of burst received optical power observation circuit of variable-gain.
Background technology:
The burst received optical power observation circuit that is applied at present EPON OLT optical module and GPON OLT optical module is basic sampling hold circuit, simple in structure, function singleness, be difficult to the up optical power monitoring of the great dynamic range that is adapted to OLT optical module, particularly for the large saturated light power (6dBm) that arrives under extreme case, the sampling of the little photoelectric current to sensitivity luminous power (30dBm) keeps, the sample range of other photoelectric current can the limit reach 10uA to 2512uA, poor for the sampled voltage that is close to 250 times, the sampling hold circuit of fixed gain is difficult to reach sampling precision requirement, particularly for-30dBm point light sampling precision be difficult to especially control.
For OLT optical module, cost control and performance index are all very crucial.For above-mentioned problem, in order to reach measuring accuracy, often adopt the means of the sampling precision that improves ADC, generally be divided into two kinds: use the MCU of higher ADC figure place and adopt larger sampling resistor, but be limited to the scope of ADC input voltage, it is very large that sampling resistor can not be got, and is general use means so use the MCU of higher ADC figure place.The MCU of higher ADC figure place means more senior MCU, needs higher cost price.
Practical effect from current:
If use the MCU of 10 ADC cheaply, in the scope of-32～-28dBm, carry out selecting test point with 0.3dB stepping so, compare with SFF8472 protocol algorithm, there are 8 points to occur the problem of monitoring accuracy error, maximum deviation is 1.09dB; Compare with actual downstream luminous power, maximum deviation has 0.92dB.
If use the MCU of 12 expensive ADC, in the scope of-32～-28dBm, carry out selecting test point with 0.3dB stepping so, compare with SFF8472 protocol algorithm, there are 5 points to occur the problem of monitoring accuracy error, maximum deviation is 0.67dB; Compare with actual downstream luminous power, maximum deviation has 0.95dB.
If use the MCU of 13 more expensive ADC, in the scope of-32～-28dBm, carry out selecting test point with 0.3dB stepping so, compare with SFF8472 protocol algorithm, there are 3 points to occur the problem of monitoring accuracy error, maximum deviation is 0.79dB; Compare with actual downstream luminous power, maximum deviation has 1.01dB.
From the above results, adopt the MCU of expensive seniority top digit ADC to monitor, also can only optimize monitoring error, well head it off, this will be a challenge that tool is large for actual production, for existing network application, be also a larger risk, particularly for requiring harsh equipment vendor and operator.The requirement of the crux optical device of at present a lot of equipment vendors to this local side of OLT is more and more higher, and cost control is more and more lower, and performance requirement goes up not down, and for optical module designer, will be a huge challenge.For OLT optical module, the particularly difficulty of hardware designs of burst received optical power monitoring (BM-RSSI) this index, one of main manifestations is monitoring accuracy, should cost low, performance be good again.
Summary of the invention:
The object of this invention is to provide one and realize variable-gain, to solve large-scale reception optical issue, make it have monitoring method and observation circuit with the burst received optical power observation circuit of the variable-gain of the ability of logarithmic amplifier equivalence.
Above-mentioned object realizes by following technical scheme:
A monitoring method for the burst received optical power observation circuit of variable-gain, under initial condition
The yield value of variable-gain burst received optical power observation circuit is
for a unknown input optical power, in the time of external triggering signal input,
The ADC value detecting under this triggering signal is greater than preset value AD_-25, and MCU carries out variable-gain operation, and closed simulation switch SW 1, becomes yield value
enter the amplifying circuit state of large input light; The ADC value detecting under this triggering signal is less than preset value AD_-25, and MCU does not carry out variable-gain operation, and not closed simulation switch SW 1, makes yield value constant, continues to remain on gain to be
the amplifying circuit state of little input light.
The monitoring method of the burst received optical power observation circuit of described variable-gain, little light-30～-25dBm adopts large gain amplifying circuit, between-30～-25dBm,
when input optical power is between-25～-6dBm time,
now Rf1 adds feedback, and gain reduces.
The monitoring method of the burst received optical power observation circuit of described variable-gain ,-25～-6dBm adopts little gain amplifying circuit, light switching point sampling ADC=AD_-25, in the time of ADC>AD_-25, gain switches to
in the time of ADC<AD_-25, gain switches to
do respectively between the stagnant regions of Δ AD on AD_-25 point both sides, when making to input light=-25dBm place and shaking, in two gain regions, monitor.
The monitoring method of the burst received optical power observation circuit of described variable-gain, adds sluggishness to avoid shaking at switching point place, and the switching point of large gain and little gain amplifying circuit is according to the requirements set of design.
The burst received optical power observation circuit of described variable-gain, its composition comprises: DC-DC & current mirror unit, sampled voltage unit, declaration form unit is adopted in fixed gain, MCU and BOSA, described DC-DC & current mirror unit produces the image current of APD photoelectric current in BOSA, by sampled voltage unit, mirror image photoelectric current is changed into sampled voltage, adopt the maintenance of sampling of declaration form unit by external sampling trigger signal control fixed gain again, the sampled voltage of stable output, MCU reads and changes sampled voltage under the triggering of external sampling trigger signal, the size of corresponding input APD luminous power, the gain multiple of the burst received optical power observation circuit of fixed gain is determined in sampled voltage unit.
Beneficial effect:
1. the present invention has realized variable-gain, has solved large-scale reception optical issue, makes it have the ability with logarithmic amplifier equivalence.
2. the present invention utilizes it large at little gain of light slope, and large gain of light slope is little, has realized its complete interior good effect of output voltage resolution of optical range that receives.
3. the present invention is shaken at switching point place for avoiding, and this method has added sluggishness on processing.
4. the present invention uses the burst received optical power observation circuit scheme of variable-gain, in the scope of-32～-28dBm, carry out selecting test point with 0.3dB stepping, compare with SFF8472 protocol algorithm, have 1 point to occur the problem of monitoring accuracy error, maximum deviation is 0.46dB; Compare with actual downstream luminous power, maximum deviation has 0.62dB.This is with respect to taking the monitoring result of MCU of 13 ADC or better, so this scheme can say that cost performance is higher.
Brief description of the drawings:
Accompanying drawing 1 is this product burst received optical power observation circuit figure.
Accompanying drawing 2 is this product single order variable-gain burst received optical power observation circuit figure.
Accompanying drawing 3 is change in gain graphs of a relation of this product single order variable-gain.
Accompanying drawing 4 is this product N rank variable-gain burst received optical power observation circuit figure.
Accompanying drawing 5 is change in gain graphs of a relation of this product N rank variable-gain.
In formula, Rf is feedback resistance 1, and Rf0 is feedback resistance 2, and Rf1 is feedback resistance 3, and VCS represents to adopt the voltage of protecting on capacitor C S; VOUT is the output voltage of direct proportion amplifier.
Embodiment:
Embodiment 1:
A monitoring method for the burst received optical power observation circuit of variable-gain, under initial condition
The yield value of variable-gain burst received optical power observation circuit is
for a unknown input optical power, in the time of external triggering signal input,
The ADC value detecting under this triggering signal is greater than preset value AD_-25, and MCU carries out variable-gain operation, and closed simulation switch SW 1, becomes yield value
enter the amplifying circuit state of large input light; The ADC value detecting under this triggering signal is less than preset value AD_-25, and MCU does not carry out variable-gain operation, and not closed simulation switch SW 1, makes yield value constant, continues to remain on gain to be
the amplifying circuit state of little input light.
Embodiment 2:
The monitoring method of the burst received optical power observation circuit of the variable-gain described in embodiment 1, little light-30～-25dBm adopts large gain amplifying circuit, between-30～-25dBm,
when input optical power is between-25～-6dBm time,
now Rf1 adds feedback, and gain reduces.
Embodiment 3:
The monitoring method of the burst received optical power observation circuit of the variable-gain described in embodiment 1 ,-25～-6dBm adopts little gain amplifying circuit, light switching point sampling ADC=AD_-25, in the time of ADC>AD_-25, gain switches to
in the time of ADC<AD_-25, gain switches to
do respectively between the stagnant regions of Δ AD on AD_-25 point both sides, when making to input light=-25dBm place and shaking, in two gain regions, monitor.
Embodiment 4:
The monitoring method of the burst received optical power observation circuit of the variable-gain described in embodiment 1 or 2 or 3, adds sluggishness to avoid shaking at switching point place, and the switching point of large gain and little gain amplifying circuit is according to the requirements set of design.
Embodiment 5:
A kind of burst received optical power observation circuit of variable-gain, its composition comprises: DC-DC & current mirror unit, sampled voltage unit, declaration form unit is adopted in fixed gain, MCU and BOSA, described DC-DC & current mirror unit produces the image current of APD photoelectric current in BOSA, by sampled voltage unit, mirror image photoelectric current is changed into sampled voltage, adopt the maintenance of sampling of declaration form unit by external sampling trigger signal control fixed gain again, the sampled voltage of stable output, MCU reads and changes sampled voltage under the triggering of external sampling trigger signal, the size of corresponding input APD luminous power, the gain multiple of the burst received optical power observation circuit of fixed gain is determined in sampled voltage unit.
Adopt the approximate voltage follower of declaration form unit, sort circuit design will be very unfavorable for the large reception optical range of dynamic range, be difficult to take into account two extreme optical power monitorings of large light and little light, the light detection precision of particularly little light; For some optical receiver, when the large light that its requirement receives reaches more large level, be subject to MCU A the restriction of D mouth input voltage, its fixed gain multiple will be crossed a step and reduce, it is worse that the precision of firm little light will become, probably, in the time that reception light is less than some values, the result of monitoring will can not change, and cannot identify the variation of received optical power again.
Embodiment 6:
The monitoring method of the burst received optical power observation circuit of the variable-gain described in above-described embodiment, for the burst receiver of some larger input optical range, single order variable-gain burst received optical power observation circuit is difficult to meet its input optical range and the requirement of monitoring precision, so multistage variable-gain burst received optical power observation circuit just seems more applicable.As shown in Figure 4, multistage variable-gain burst mode receiver derives on the basis of single order variable-gain burst mode receiver, increase more groups feedback resistance Rf2, Rf3 ... Rfn and analog switch SW1, SW2, SWn.As shown in accompanying drawing 4, accompanying drawing 5:
Between A～BdBm,
in the time that input optical power is increased between B～CdBm, analog switch SW1 closure,
now because Rf1 adds feedback, so gain reduces; In the time that input optical power is increased between C～DdBm, analog switch SW2 closure,
now because Rf2 adds feedback, so gain reduces again; When input optical power is increased to DdBm when above, analog switch SWn closure,
now because Rfn adds feedback, so gain reduces again.
About the Design of Amplification Circuit method of the variable-gain relating in this patent, be not only confined to the optical power monitoring circuit that happens suddenly, can also expand in all optical device and light device, and other is similarly applied in design.
Claims (5)
1. a monitoring method for the burst received optical power observation circuit of variable-gain, is characterized in that: under initial condition, the yield value of variable-gain burst received optical power observation circuit is
for a unknown input optical power, in the time of external triggering signal input, ADC (analog to digital converter) value detecting under this triggering signal is greater than preset value AD_-25, and MCU carries out variable-gain operation, and closed simulation switch SW 1, becomes yield value
enter the amplifying circuit state of large input light; The ADC value detecting under this triggering signal is less than preset value AD_-25, and MCU (micro-control unit) does not carry out variable-gain operation, and not closed simulation switch SW 1, makes yield value constant, continues to remain on gain to be
the amplifying circuit state of little input light.
2. the monitoring method of the burst received optical power observation circuit of variable-gain according to claim 1, is characterized in that: little light-30～-25dBm adopts large gain amplifying circuit, between-30～-25dBm,
when input optical power is between-25～-6dBm time,
now Rf1 adds feedback, and gain reduces.
3. the monitoring method of the burst received optical power observation circuit of variable-gain according to claim 1, it is characterized in that :-25～-6dBm adopts little gain amplifying circuit, light switching point sampling ADC=AD_-25, in the time of ADC>AD_-25, gain switches to
in the time of ADC<AD_-25, gain switches to
do respectively between the stagnant regions of Δ AD on AD_-25 point both sides, when making to input light=-25dBm place and shaking, in two gain regions, monitor.
4. according to the monitoring method of the burst received optical power observation circuit of the variable-gain described in claim 1 or 2 or 3, it is characterized in that: add sluggishness to avoid shaking at switching point place, the switching point of large gain and little gain amplifying circuit is according to the requirements set of design.
5. the burst received optical power observation circuit of a variable-gain, its composition comprises: DC-DC booster circuit & current mirror unit, sampled voltage unit, declaration form unit is adopted in fixed gain, MCU and BOSA (optical assembly), it is characterized in that: described DC-DC booster circuit & current mirror unit produces the image current of APD (avalanche diode) photoelectric current in BOSA, by sampled voltage unit, mirror image photoelectric current is changed into sampled voltage, adopt the maintenance of sampling of declaration form unit by external sampling trigger signal control fixed gain again, the sampled voltage of stable output, MCU reads and changes sampled voltage under the triggering of external sampling trigger signal, the size of corresponding input APD luminous power, the gain multiple of the burst received optical power observation circuit of fixed gain is determined in sampled voltage unit.
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| CN107231190A (en) * | 2017-07-21 | 2017-10-03 | 东莞铭普光磁股份有限公司 | A kind of optical power monitoring circuit and method |
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Application publication date: 20140820 |