CN100438380C - Carrier optical receiver front feed automatic gain control method and optical receiver using same - Google Patents
Carrier optical receiver front feed automatic gain control method and optical receiver using same Download PDFInfo
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- CN100438380C CN100438380C CNB200510019171XA CN200510019171A CN100438380C CN 100438380 C CN100438380 C CN 100438380C CN B200510019171X A CNB200510019171X A CN B200510019171XA CN 200510019171 A CN200510019171 A CN 200510019171A CN 100438380 C CN100438380 C CN 100438380C
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Abstract
The present invention relates to a carrier wave optical receiver front feed automatic gain control method and an optical receiver by using the method. The present invention is characterized in that (1) the power electric level of incidence light is detected and obtained by optical power from an optoelectronic converter of the front end of a carrier wave optical receiver; (2) the power electric level of the incidence light is changed to obtain the control electric level which is proportional with the power electric level of the incidence light; (3) the control electric level is used for driving a radio frequency signal attenuator, so that the electric level of an output signal of a receiver corresponding to different incident light power is stabilized in a required range. The optical receiver of the present invention is mainly composed of a photoelectric converter, a radio frequency signal amplifying circuit, the radio frequency signal attenuator, a light power electric level detecting circuit, a light power electric level adjustment and an attenuation electric level generators, etc. The attenuation electric level generator is connected between the light power electric level detecting circuit and the radio frequency signal attenuator. The present invention replaces a complex wideband radio-frequency power feedback gain control method, enhances stability and a broadband characteristic of a radio frequency circuit, simplifies circuit structure, and accordingly, reduces cost.
Description
Technical field
The present invention relates to a kind of automatic gain control carrier wave optical receiver of feed forward architecture, specifically, relate to a kind of universal simulation CATV and digital satellite television optical receiver that is used for the optical access network user side.
Background technology
In optical fiber communication, the wireless signal optical transmission, in the optical information transmission systems such as optical fiber cable TV/satellite television, the carrier wave optical receiver is an indispensable device, especially resemble the wireless signal optical transmission, carrier wave optical receivers such as optical fiber cable TV/satellite television, to the output signal level amplitude, linearity etc. more have strict requirement.The carrier wave optical receiver mainly contains opto-electronic conversion, the preposition amplification of low noise, and signal amplitude is amplified, and several parts such as equilibrium and gain controlling are formed.In the wireless signal optical transmission, during optical fiber cable TV/satellite TV system was used, optical receiver must have good broad band multicarrier characteristic and sufficiently high dynamic range, so that can transmit television channel as much as possible and adapt to different transmission ranges.In recent years, development along with the FTTC/FTTH technology, the optical receiver that is used for the transmission of optical fiber cable TV and optical fiber satellite television has been proposed to upgrade and higher requirement, show mainly that to receiver light incident power high dynamic range and low-cost two aspects this is the problem that adapts to the special construction of optical access network and reduce the necessary solution of user's ability to bear.The research and development of new personal house type carrier wave optical receiver have become a focus of current broadband optical access technology.
Existing band optical fiber cable TV/satellite television optical receiver only possesses limited rf gain regulatory function, and is manual adjustments mostly, and its reason is because the automatic gain control circuit of manufacturing the broadband in radio frequency and microwave band difficulty relatively.In the optical receiver that adopts automatic gain to regulate, rely on detection radio frequency output level that feedback attenuation control is provided, thereby realize control output level.This gain-adjusted function can only be controlled the level of total power of output effectively, guarantee the broadband character of receiver, except that the gain link, the broadband consistency of wave detector is also had very high requirement; And because different satellite play television channel numbers also can be different with the frequency number, receiver must be done corresponding adjustment, and so, the versatility of optical receiver has also reduced.
The present invention carries out conversion by luminous power is detected level, directly generates the method for radiofrequency signal decay control level, realizes the automatic controlled function to each channel signals level of optical receiver output.This thinking is based on following two main causes: (1) all has optical level to detect and incident optical power state deixis at nearly all optical receiver front end, and therefore, obtaining the incident optical power level is the indispensable function of optical receiver; (2) intend in the modulation signal at optical mode, the carrier amplitude of each channel signals and optical level amplitude have fixing ratio, so have comprised the carrier amplitude information of each channel signals in the incident optical power level, with how much haveing nothing to do of carrier wave.
Summary of the invention
The circuit structure complexity that " radio frequency level detects and the feedback attenuation control " method that the objective of the invention is to adopt at existing carrier wave optical receiver exists, the reference level setting is subjected to systematic influence big, and problem such as receiver dynamic range is little, a kind of carrier wave optical receiver front feed automatic gain control method and optical receiver thereof have been proposed, the stability and the broadband character of radio circuit have been improved, simplify circuit structure, thereby also reduced cost.
The object of the present invention is achieved like this: carrier wave optical receiver front feed automatic gain control method,
1, from the optical-electrical converter of carrier wave optical receiver front end, detects acquisition incident optical power level by luminous power;
2,, obtain and the proportional control level of incident optical power level with the incident optical power level translation;
3, drive the radiofrequency signal attenuator with control level, the receiver output signal level of corresponding different incident optical powers is stabilized in the desired scope;
It is characterized in that: described incident optical power level translation is that incident optical power level process is compared the level of attenuation generator that differential amplifier constitutes by a logarithmic amplifier and a reference, is transformed into linear level of attenuation.
The carrier wave optical receiver of feedforward automatic gain control, it comprises optical-electrical converter, radio frequency signal amplifiers, radiofrequency signal attenuator, optical level testing circuit and level of attenuation generator, photoelectric switching circuit, radio frequency signal amplifiers, radiofrequency signal attenuator, radio frequency signal amplifiers are electrically connected successively, photoelectric switching circuit is connected with the optical level testing circuit simultaneously, and the level of attenuation generator is connected between optical level testing circuit and the radiofrequency signal attenuator;
It is characterized in that: described radiofrequency signal attenuator is linear radiofrequency signal attenuator, described level of attenuation generator compares differential amplifier by a logarithmic amplifier and a reference and constitutes the output termination differential amplifier signal input part of logarithmic amplifier.
Specifically, the present invention proposes the thought that adopts feed forward architecture to realize the control of output radiofrequency signal amplitude, the new optical receiver that adopts this method is mainly by optical-electrical converter 1, radio frequency signal amplifiers 2,4, radiofrequency signal attenuator 3, optical level testing circuit 5, several parts such as optical level adjustment and level of attenuation generator 6 and luminous power condition indication circuit 7 etc. are formed; Carry out conversion by luminous power is detected level, directly generate the method for radiofrequency signal decay control level, realize automatic controlled function each channel signals level of optical receiver output.
The present invention has the following advantages and good effect:
1, saves the radio frequency demodulator probe of existing automatic gain control carrier wave optical receiver, simplified radio frequency structure, reduced cost;
2, eliminated because the output echo is introduced error in the radio frequency detecting circuit, thereby caused output level factor out of control;
3, eliminated owing to of the influence of loop control procedure the carrier signal quality.
Description of drawings
Figure-1, existing radio frequency optical receiver structural representation.
Figure-2, the radio frequency optical receiver structural representation of the embodiment of the invention.Wherein, 1 optical-electrical converter PIN; 2 and 4 radio frequency signal amplifiers; 3 radiofrequency signal attenuators; 5 level sensitive circuits; 6 optical level adjustment and level of attenuation generator; 7 luminous power condition indication circuits.
Figure-3, incident optical signal power and direct current output level relation.
Figure-4, the level translation process of level-conversion circuit.
Figure-5, typical logarithmic transformation circuit theory diagrams.
Figure-6, voltage sample optical level detect feedforward optical receiver circuit.
Figure-7, current sample optical level detect feedforward optical receiver circuit.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
For adapting to the input power variation and keeping the stable of output signal, the optical receiver circuit must have output signal measuring ability and automatic gain control function.The feed forward architecture optical receiver circuit that the present invention proposes is shown in figure-2, and wherein 1 is optical-electrical converter PIN; 2 and 4 is radio frequency signal amplifiers; The 3rd, voltage-controlled radiofrequency signal attenuator; 5 is the optical level testing circuit, is a circuit that photoelectric current or photoelectric current sampled signal is converted to the voltage signal of suitable amplitude; 6 is optical level adjustment and level of attenuation generator, generally compares differential amplifier by a logarithmic amplifier and a reference and constitutes; The 7th, the luminous power condition indication circuit generally is made of a logical drive and LED.Different with traditional radio frequency optical receiver (figure-1), the radio frequency optical receiver of feed forward architecture need not obtain radio-frequency (RF) signal strength at output, but by extracting the method that has the optical level of proportionate relationship with radio-frequency (RF) signal strength and obtain the radiofrequency signal amplitude indirectly, and control the gain of radio frequency amplifier with this, reach the purpose of stablizing output amplitude, thereby constitute a kind of feedfoward control structure.
The key of feed forward architecture optical receiver is the conversion of optical level, and for adapting to higher luminous power dynamic range, the level after the conversion must be consistent as far as possible with the radio frequency attenuator driving voltage.The present invention adopts a level of attenuation generator (circuit 6 among the figure-2) to realize the conversion of optical level.Owing to will realize and the identical voltage～attenuation law of attenuator driving voltage, also can adopt multistage structure.The level of attenuation generator comes down to an analog level translation circuit, its level translation process is shown in figure-4, for example, if adopt voltage～attenuation law to be approximately linear radio frequency attenuator, because the sampled voltage～luminous power after the photoelectric current conversion is index law, can adopt logarithmic transformation that sampled voltage～luminous power is become the rule of approximately linear, the consistency of this optical level and attenuator control level is the key that guarantees each channel output level amplitude stabilization.Certainly, not linear radio frequency attenuator for attenuation law, as long as make voltage of transformation consistent as far as possible with the attenuation law of radio frequency attenuator.
The key of this technology is to make level of attenuation generator (analog level translation circuit) have excellent adaptability to different incident optical powers, the photoelectric current and the incident optical power of PIN detector are index law, therefore must adopt a logarithmic transformation could realize the linear relationship of luminous power and voltage output, figure the-5th, a kind of logarithmic transformation circuit can be used for constituting the level of attenuation generator corresponding with luminous power.
Detect and level translation based on top optical level, we have proposed the optical receiver structure of the feedfoward control of following (figure-6 and figure-7): promptly by detecting the adaptive approach of the corresponding adjusting radio frequency attenuator of incident optical power amplitude, the radio frequency output amplitude is controlled in certain scope.
Figure-6 is based on the receiver principle block diagram that the voltage sample luminous power detects, by being amplified through differential amplifier, the pressure drop on the sample resistance obtains optical level, the wherein gain of radio frequency amplifier and progression, the sum of series decay of radio frequency attenuator distributes on the dynamic range of entire circuit and output amplitude requirement to be decided, and guarantees in each inter-stage gain and amplitude energy smooth change; The photo-signal of the PIN pipe of flowing through is sampled by sampling resistor, obtain optical level, directly drive the control that radio frequency attenuator is realized amplitude output signal by the attenuator control level that obtains after the optical level conversion; Optical level indication and alarm function then are the functions that often has.
What figure-7 provided is a kind of optical receiver theory diagram that detects based on the current sample luminous power, adopts trans-impedance amplifier to convert photoelectric current to voltage, disturbs for eliminating high-frequency signal, and the sampling inlet is added with filter capacitor; The current-limiting resistance of current sampling circuit is enough big to guarantee the least possible shunting photo-signal; Except that a little difference of front-end circuit, the functional framework of optical receiver and figure-6 basically identicals.
The hookup result of figure-6,7 structures proves that this feedforward control circuit is fully feasible, and when a CATV optical receiver had been realized incident optical power dynamic range 13dB (luminous power), output only changed 5dB (electrical power).
Claims (2)
1, carrier wave optical receiver front feed automatic gain control method,
1., from the optical-electrical converter of carrier wave optical receiver front end, detect by luminous power and to obtain the incident optical power level;
2., with the incident optical power level translation, obtain and the proportional control level of incident optical power level;
3., drive the radiofrequency signal attenuator, the receiver output signal level of corresponding different incident optical powers is stabilized in the desired scope with control level;
It is characterized in that: described incident optical power level translation is that incident optical power level process is compared the level of attenuation generator that differential amplifier constitutes by a logarithmic amplifier and a reference, is transformed into linear level of attenuation.
2, the carrier wave optical receiver of feedforward automatic gain control, it comprises optical-electrical converter, radio frequency signal amplifiers, the radiofrequency signal attenuator, optical level testing circuit and level of attenuation generator, photoelectric switching circuit, radio frequency signal amplifiers, the radiofrequency signal attenuator, radio frequency signal amplifiers is electrically connected successively, photoelectric switching circuit is connected with the optical level testing circuit simultaneously, the level of attenuation generator is connected between optical level testing circuit and the radiofrequency signal attenuator, it is characterized in that: described radiofrequency signal attenuator is linear radiofrequency signal attenuator, described level of attenuation generator compares differential amplifier by a logarithmic amplifier and a reference and constitutes the output termination differential amplifier signal input part of logarithmic amplifier.
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| CNB200510019171XA CN100438380C (en) | 2005-07-28 | 2005-07-28 | Carrier optical receiver front feed automatic gain control method and optical receiver using same |
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| CNB200510019171XA CN100438380C (en) | 2005-07-28 | 2005-07-28 | Carrier optical receiver front feed automatic gain control method and optical receiver using same |
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| CN100438380C true CN100438380C (en) | 2008-11-26 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101860397B (en) * | 2010-06-11 | 2013-03-13 | 武汉光迅科技股份有限公司 | Photoelectric receptor for continuously compensating equilibrium path and compensation method thereof |
| CN102289197B (en) * | 2011-03-25 | 2012-12-19 | 武汉光迅科技股份有限公司 | Integrated control system and control method for variable optical attenuator |
| CN104901747A (en) * | 2015-06-08 | 2015-09-09 | 东南大学 | Adaptive gain adjustment method based on avalanche photo diode (APD) amplifier at front end of visible light receiver |
| CN108449060B (en) * | 2018-03-22 | 2022-03-11 | 中国电子科技集团公司第二十四研究所 | Fast stable AGC amplifier |
| CN108322264A (en) * | 2018-04-12 | 2018-07-24 | 中国电子科技集团公司第三十四研究所 | A kind of radio frequency fiber optic receiving terminal of communication system based on voltage-controlled optical attenuator |
| CN111193553A (en) * | 2020-03-04 | 2020-05-22 | 中国电子科技集团公司第三十四研究所 | Light path insertion loss self-adaptive radio frequency optical receiver |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6023363A (en) * | 1996-07-01 | 2000-02-08 | Hitachi, Ltd. | Optical transmission apparatus |
| CN1438771A (en) * | 2002-02-12 | 2003-08-27 | 夏普株式会社 | Optical receiver ampeifier and optical pick-up device adopting said circuit |
| WO2004008667A1 (en) * | 2002-07-11 | 2004-01-22 | Koninklijke Philips Electronics N.V. | Optical receiver circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6023363A (en) * | 1996-07-01 | 2000-02-08 | Hitachi, Ltd. | Optical transmission apparatus |
| CN1438771A (en) * | 2002-02-12 | 2003-08-27 | 夏普株式会社 | Optical receiver ampeifier and optical pick-up device adopting said circuit |
| WO2004008667A1 (en) * | 2002-07-11 | 2004-01-22 | Koninklijke Philips Electronics N.V. | Optical receiver circuit |
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