CN104617902A - Automatic cable television optical receiver gain control method by using light power - Google Patents
Automatic cable television optical receiver gain control method by using light power Download PDFInfo
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- CN104617902A CN104617902A CN201410784222.7A CN201410784222A CN104617902A CN 104617902 A CN104617902 A CN 104617902A CN 201410784222 A CN201410784222 A CN 201410784222A CN 104617902 A CN104617902 A CN 104617902A
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Abstract
The invention relates to an automatic cable television optical receiver gain control method by using light power. Tje optical power for each additional 1dBm, RF output level will increase 2dB, the optical power by photoelectric conversion circuit is converted to electrical signal, output all the way through amplifier circuit to II type attenuator circuit, the electrical signal output by the other way to II acquisition circuit type variable attenuator control circuit for detecting an electric signal increase, II matching circuit type variable attenuator control output and II attenuation type attenuator circuit, the input optical power for each additional 1dBm, II type attenuator circuit attenuation 2dB, suppressing optical power gain. The method solves the problem that the light receiving optical power changes the RF signal output problem. The method has low cost, use of application, while reducing the cost of installation of debugging.
Description
Technical field
The present invention relates to a kind of mechanics of communication, particularly a kind of method utilizing luminous power automatically to control cable television photo-receiver gain.
Background technology
Along with the development of the integration of three networks, the rectification of digital TV network, the cost of optical fiber is more and more lower, increasing in a large number of optical node, the demand of receiver is surged, also greatly increase for the management of optical receiver and debugging work load, along with the change of external environment condition, luminous power also can and then change, common receiver just needs all will debug one time at every turn, increase the workload of maintenance greatly, utilize automatic growth control (AGC) method, doing so avoids frequent debugging problem.
Along with fiber to the home (FTTH), popularizing of optical fiber, the problem of equipment cost puts on work schedule, utilizes the method for light-operated AGC, this reduces material cost, also reduce human cost simultaneously.
Summary of the invention
The present invention be directed to Digital Television development too fast, the universal utilization of optical fiber, existing optical receiver is caused not catch up with the problem developing and cause cost to increase, propose a kind of method utilizing luminous power automatically to control cable television photo-receiver gain, the method makes optical receiver automatically regulate according to input, adapt to present fiber-to-the-home development, again reduce debugging cost.
Technical scheme of the present invention is: a kind of method utilizing luminous power automatically to control cable television photo-receiver gain, luminous power often increases 1dBm, radio frequency output level can increase 2dB, luminous power is converted to the signal of telecommunication by photoelectric switching circuit, the signal of telecommunication exports leads up to amplifying circuit to Π type attenuator circuit, the signal of telecommunication export separately lead up to Acquisition Circuit to Π type adjustable damping control circuit detection the signal of telecommunication recruitment, the attenuation of coupling Π type adjustable damping control circuit output variable and Π type attenuator circuit, input optical power is made often to increase 1dBm, Π type attenuator circuit decay 2dB, suppress the gain of luminous power.
Described Acquisition Circuit inductance L 1 filtering radiofrequency signal, by entering Π type adjustable damping control circuit through the DC component of divider resistance dividing potential drop after inductance L 1, Π type adjustable damping control circuit comprises 10 reference comparator in parallel, divide the negative terminal of crimping 10 reference comparator through divider resistance after inductance L 1 exports, direct current supply voltage is by 11 grounding through resistances of series connection, the corresponding connecting resistance tie point of anode of 10 reference comparator, 10 reference comparator export and output to Π type attenuator circuit respectively by the diode of connecting and resistance.
Described 10 reference comparator export correspondence and connect 10 light-emitting diodes, the variable quantity of display light power.
Described Π type attenuator circuit is the Π type attenuator circuit of 4 PIN pipe compositions.
Beneficial effect of the present invention is: the present invention utilizes luminous power automatically to control the method for cable television photo-receiver gain, and solution light-receiving exports the problem that radiofrequency signal also changes thereupon with optical power change.What adopt is a kind of hardware controlling method simultaneously, and cost is lower, saves product cost, can effectively apply.Debugging cost during installation is greatly reduced again after utilizing the method.
Accompanying drawing explanation
Fig. 1 is that the present invention utilizes luminous power automatically to control cable television optical receiver gain principles block diagram;
Fig. 2 is embodiment of the present invention circuit diagram.
Embodiment
The present invention is that the luminous power size that utilizes be applied on cable television photo-receiver controls the method for optical receiver constant output level automatically, schematic diagram as shown in Figure 1, comprise photoelectric switching circuit, first order amplifying circuit, Π type attenuator circuit, second level amplifying circuit, Acquisition Circuit, reference circuit, Π type adjustable damping control circuit, luminous power display circuit.Optical fiber input optical signal converts the signal of telecommunication by photoelectric switching circuit to light signal, one tunnel utilizes Acquisition Circuit the signal of telecommunication to be sent into Π type adjustable damping control circuit, the size of light signal is judged according to the signal of telecommunication, the reference voltage provided with comparator in Π type adjustable damping control circuit compares, judge the working range of light, conditioning signal is passed out to Π type attenuator circuit again, and carry out display light watt level by light-emitting diode; Another road signal of telecommunication that photoelectric switching circuit exports, Π type attenuator circuit is entered through first order amplifying circuit, Π type attenuator circuit is after the adjustment of Π type adjustable damping control circuit, eliminate the change of the radio frequency level that optical power change causes, export constant radiofrequency signal and exported by second level amplifying circuit again.
When luminous power often increases 1dBm, radio frequency output level will increase 2dB.Utilize the high low signal of luminous power to carry out regulated attenuator, the level that balance increases exports, the stable output of control level.
Embodiment circuit diagram as shown in Figure 2, in optical power change between-8 ~+2dBm, optical receiver level constant exports.Utilize the characteristic of PIN pipe, when the operating frequency of PIN pipe is greater than 10 times of cut-off frequencies, PIN pipe can regard pure resistance as, is determined the number of the resistance of PIN pipe, utilize this performance to design Π type attenuator circuit by the electric current of PIN pipe.Π type adjustable damping control circuit utilizes comparator to allow the light signal gathered compare with reference signal, the degree of decay of comparative result regulating and controlling Π type attenuator circuit, control stabilizing output level, simultaneously by the indicator light in comparative result luminous power display circuit, represent the luminous power size exported.
As shown in Figure 2, the signal of photoelectric switching circuit output is through Acquisition Circuit L1, C11, R25, R26, C12, inductance L 1 filtering radiofrequency signal, there are radiofrequency signal and direct current component in the input of L1, inductance L 1 is utilized to suppress radiofrequency signal, the characteristic that direct current component passes through, again through resistance R25, R26 dividing potential drop, C11, C12 carries out filtering to the signal gathered, R25, the voltage signal that R26 dividing potential drop exports represents the size of luminous power, the output of L1 connects the negative terminal of 10 reference comparator in Π type adjustable damping control circuit, the anode of reference comparator connects direct current supply voltage by R11 ~ R21 resistance of series connection, like this according to the change of luminous power, the reference comparator conducting of corresponding number, export the voltage Vc of respective change, voltage Vc enters Π type attenuator circuit, can control to flow through PIN pipe D31, the electric current of D32, because under PIN pipe is operated in and is greater than 10 times of cut-off frequencies, for pure resistance performance, curent change, PIN pipe resistance is change just, play this effect of attenuator.Each comparator and Π type attenuator circuit matching design, make π attenuator output attenuatoin 2dB successively.
When luminous power is lower than-8dBm, the comparator of Π type adjustable damping control circuit is all in and sets high operating state, Vc value is maximum, Π type attenuator circuit attenuation is minimum, whenever light increases 1dBm, comparator exports just has one to set low, and control voltage Vc just reduces, PIN electric current just reduces, and increases 2dB according to circuit Π type attenuator circuit attenuation.The like, when luminous power is increased to+2dBm, the comparator of all Π type attenuation control circuits is all in and sets low operating state, and control voltage Vc is minimum, increases 2OdB according to circuit Π type attenuator circuit attenuation.
Circuit application is on cable television photo-receiver, his operating frequency is at 47M-1000MHZ, the HSMP-3814 that π attenuator adopts is that a kind of PIN manages, and under utilizing it to be operated in 10fc, is namely greater than 1MHZ, be one in high frequency to increase and the π attenuator of the pure resistance characteristics design of reduction with electric current, simultaneously according to comparison circuit, the size of display light power, luminous power often increases 1dbm, LED light just bright one, wherein by mistake the effect of D3 ~ D12 prevents from the voltage of Vc from flowing backwards to make LED light.
Π type adjustable damping circuit adopts HSMP-3814 product design in Aglilent company PIN diode product line.PIN pipe D31, D32, D33, D34 are usually used as Flow Control RF resistance and use.Be operated in decuple cut-off frequency fc frequency on, PIN pipe can be designed to a Flow Control resistance accurately.When the frequency operation of below 0.1fc, the characteristic of PIN pipe is just equivalent to a PN junction diode.When being operated between 0.1fc to 10fc, its characteristic becomes very complicated; Usually it shows as the resistance with frequency change, with inductance or the electric capacity of curent change.In addition, when this frequency ranges of operation, the nonlinear characteristic of pipe is poor.Pipe τ=the 1500nsec of HSMP-3814, therefore cut-off frequency is 100KHZ.This pipe should show as a pure resistance with curent change when more than 1MHZ frequency operation.VCC is a fixed voltage, and Vc is the variable voltage of net control attenuation.R31 and R32 is respectively as the biasing resistance of series connection PIN pipe D31 and D32, when operating frequency is much larger than 10 times of cut-off frequencies, PIN diode is exactly a pure resistance with the change of electric current, reduce along with the increase of electric current, be equivalent to the attenuation along with the increase of control voltage Vc at Π type adjustable damping circuit and reduce.When luminous power is very little, lower than-8dbm, value ratio "+" end value that "-" of comparator U1 ~ U10 holds is little, the output of comparator sets high, the value of R1 ~ R10 is set respectively, the size (such as: from U1-D3-R1-L2-R36-D31-R31 and U1-D3-R1-L2-R36-D32-R32 sum) of electric current when determining that every road comparator sets high, when Shi Mei road comparator circuit sets high, after electric current is increased, the resistance of PIN pipe reduces, decay when being converted to pad value 2dB, pad value is now minimum, levels off to 3 dB (pad value of Π type adjustable damping circuit itself).When luminous power often increases by 1 dbm, to U10 from U1, comparator just sets low successively one by one, and the pad value of Π type adjustable damping circuit just increases 2dB, until luminous power is+2dbm, link attenuation amount is maximum.Thus achieve the automatic gain control function of link.Wherein the effect of D3 ~ D12 prevents circuit reverse voltage from affecting luminous power indicator light.
Claims (4)
1. the method utilizing luminous power automatically to control cable television photo-receiver gain, it is characterized in that, luminous power often increases 1dBm, radio frequency output level can increase 2dB, luminous power is converted to the signal of telecommunication by photoelectric switching circuit, the signal of telecommunication exports leads up to amplifying circuit to Π type attenuator circuit, the signal of telecommunication export separately lead up to Acquisition Circuit to Π type adjustable damping control circuit detection the signal of telecommunication recruitment, the attenuation of coupling Π type adjustable damping control circuit output variable and Π type attenuator circuit, input optical power is made often to increase 1dBm, Π type attenuator circuit decay 2dB, suppress the gain of luminous power.
2. utilize luminous power automatically to control the method for cable television photo-receiver gain according to claim 1, it is characterized in that, described Acquisition Circuit inductance L 1 filtering radiofrequency signal, by entering Π type adjustable damping control circuit through the DC component of divider resistance dividing potential drop after inductance L 1, Π type adjustable damping control circuit comprises 10 reference comparator in parallel, divide the negative terminal of crimping 10 reference comparator through divider resistance after inductance L 1 exports, direct current supply voltage is by 11 grounding through resistances of series connection, the corresponding connecting resistance tie point of anode of 10 reference comparator, 10 reference comparator export and output to Π type attenuator circuit respectively by the diode of connecting and resistance.
3. utilize luminous power automatically to control the method for cable television photo-receiver gain according to claim 2, it is characterized in that, described 10 reference comparator export correspondence and connect 10 light-emitting diodes, the variable quantity of display light power.
4. utilize luminous power automatically to control the method for cable television photo-receiver gain according to claim 2, it is characterized in that, described Π type attenuator circuit is the Π type attenuator circuit of 4 PIN pipe compositions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410784222.7A CN104617902A (en) | 2014-12-16 | 2014-12-16 | Automatic cable television optical receiver gain control method by using light power |
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| CN201410784222.7A CN104617902A (en) | 2014-12-16 | 2014-12-16 | Automatic cable television optical receiver gain control method by using light power |
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| CN201410784222.7A Pending CN104617902A (en) | 2014-12-16 | 2014-12-16 | Automatic cable television optical receiver gain control method by using light power |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109474351A (en) * | 2018-12-20 | 2019-03-15 | 四川璧虹广播电视新技术有限公司 | A kind of AGC control method for satellite optical receiver circuit |
| CN109639260A (en) * | 2019-01-07 | 2019-04-16 | 南京迅测科技有限公司 | Realize the device and synchronous calibration method for improving the synchronous success rate of instrument reference clock |
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| WO1992021179A1 (en) * | 1991-05-22 | 1992-11-26 | Southwestern Bell Technology Resources, Inc. | Dynamic range enhancer |
| US20090058519A1 (en) * | 2007-08-31 | 2009-03-05 | Analog Devices, Inc. | Variable Automatic Limit Control (ALC) Threshold for any Desired Compression Curve |
| CN201298848Y (en) * | 2008-11-11 | 2009-08-26 | 无锡雷华网络技术有限公司 | Broadband photoelectric conversion automatic gain control circuit structure |
| CN201571025U (en) * | 2009-12-15 | 2010-09-01 | 汕头高新区亚威科技有限公司 | Optical AGC control circuit used for optical receiver |
| CN202218196U (en) * | 2011-07-22 | 2012-05-09 | 浙江省广电科技股份有限公司 | Optical automatic gain clamp (AGC) control circuit for cabled television optical receiving machine |
| CN202364228U (en) * | 2011-12-14 | 2012-08-01 | 深圳市万和电子有限公司 | AGC (Automatic Gain Control) optical receiving module circuit |
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2014
- 2014-12-16 CN CN201410784222.7A patent/CN104617902A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992021179A1 (en) * | 1991-05-22 | 1992-11-26 | Southwestern Bell Technology Resources, Inc. | Dynamic range enhancer |
| US20090058519A1 (en) * | 2007-08-31 | 2009-03-05 | Analog Devices, Inc. | Variable Automatic Limit Control (ALC) Threshold for any Desired Compression Curve |
| CN201298848Y (en) * | 2008-11-11 | 2009-08-26 | 无锡雷华网络技术有限公司 | Broadband photoelectric conversion automatic gain control circuit structure |
| CN201571025U (en) * | 2009-12-15 | 2010-09-01 | 汕头高新区亚威科技有限公司 | Optical AGC control circuit used for optical receiver |
| CN202218196U (en) * | 2011-07-22 | 2012-05-09 | 浙江省广电科技股份有限公司 | Optical automatic gain clamp (AGC) control circuit for cabled television optical receiving machine |
| CN202364228U (en) * | 2011-12-14 | 2012-08-01 | 深圳市万和电子有限公司 | AGC (Automatic Gain Control) optical receiving module circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109474351A (en) * | 2018-12-20 | 2019-03-15 | 四川璧虹广播电视新技术有限公司 | A kind of AGC control method for satellite optical receiver circuit |
| CN109474351B (en) * | 2018-12-20 | 2021-07-20 | 四川璧虹电子信息技术有限公司 | AGC control method for satellite optical receiver circuit |
| CN109639260A (en) * | 2019-01-07 | 2019-04-16 | 南京迅测科技有限公司 | Realize the device and synchronous calibration method for improving the synchronous success rate of instrument reference clock |
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