CN105306147A - Digital optical receiver - Google Patents
Digital optical receiver Download PDFInfo
- Publication number
- CN105306147A CN105306147A CN201510719552.2A CN201510719552A CN105306147A CN 105306147 A CN105306147 A CN 105306147A CN 201510719552 A CN201510719552 A CN 201510719552A CN 105306147 A CN105306147 A CN 105306147A
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- China
- Prior art keywords
- circuit
- optical receiver
- digital optical
- main amplifier
- detector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a digital optical receiver, comprising: an optical detector, a preamplifier, a main amplifier, a balanced filter circuit, an automatic gain control circuit, a decision circuit, a clock extraction circuit and a data output unit, wherein the optical detector, the preamplifier, the main amplifier, the balanced filter circuit and the decision circuit are connected in sequence; the automatic gain control circuit is further connected between the main amplifier and the balanced filter circuit; and the clock extraction circuit is respectively connected with the balanced filter circuit and the decision circuit. The digital optical receiver disclosed by the invention has the advantages of simple structure and good product quality.
Description
Technical field
The present invention relates to a kind of digital optical receiver, belong to optoelectronic information technical field.
Background technology
Digital optical receiver is be the equipment that electric digital signal is input to electric terminal the light digital signal transition from optical fiber.
Summary of the invention
Object: in order to overcome the deficiencies in the prior art, the invention provides a kind of digital optical receiver.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of digital optical receiver, comprising: photo-detector, preamplifier, main amplifier, equalization filtering circuit, automatic gain control circuit, decision circuit, clock extracting circuit, data outputting unit; Described photo-detector, preamplifier, main amplifier, equalization filtering circuit, decision circuit connect successively; Also automatic gain control circuit is connected with between described main amplifier, equalization filtering circuit; Described clock extracting circuit is connected with decision circuit with equalization filtering circuit respectively.
Described digital optical receiver, is characterized in that: described photo-detector comprises voltage supply circuit.
Described digital optical receiver, is characterized in that: described photo-detector adopts PIN photodiode.
Described digital optical receiver, is characterized in that: described photo-detector adopts avalanche type APD photodiode.
Described digital optical receiver, is characterized in that: described main amplifier output voltage is 1-3V.
Described digital optical receiver, is characterized in that: the output of described equalization filtering circuit is waveform with raised-cosine spectrum.
Beneficial effect: digital optical receiver provided by the invention, photodetector changes the signal of telecommunication into the light signal from optical fiber, and enter equalizer through amplifying, equalizer becomes raised cosine wave to adjudicate pulse signal equalization again.The signal with raised cosine waveform can utilize its " zero crossing judgement " method to get rid of intersymbol interference to reduce error code, and the bandwidth that raised cosine equilibrium simultaneously can be unrequired in compression channel is to reduce noise.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, a kind of digital optical receiver, comprising: photo-detector, preamplifier, main amplifier, equalization filtering circuit, automatic gain control circuit, decision circuit, clock extracting circuit, data outputting unit; Described photo-detector, preamplifier, main amplifier, equalization filtering circuit, decision circuit connect successively; Also automatic gain control circuit is connected with between described main amplifier, equalization filtering circuit; Described clock extracting circuit is connected with decision circuit with equalization filtering circuit respectively.
Described digital optical receiver, is characterized in that: described photo-detector comprises voltage supply circuit.
Described digital optical receiver, is characterized in that: described photo-detector adopts PIN photodiode or avalanche type APD photodiode.
Described digital optical receiver, is characterized in that: described main amplifier output voltage is 1-3V.
Described digital optical receiver, is characterized in that: the output of described equalization filtering circuit is waveform with raised-cosine spectrum.
Photodetector changes the signal of telecommunication into the light signal from optical fiber, and enter equalizer through amplifying, equalizer becomes raised cosine wave to adjudicate pulse signal equalization again.The signal with raised cosine waveform can utilize its " zero crossing judgement " method to get rid of intersymbol interference to reduce error code, and the bandwidth that raised cosine equilibrium simultaneously can be unrequired in compression channel is to reduce noise.The effect of decision device carries out " 0 " " 1 " judgement to signal, is defined as " 1 ", otherwise is " 0 ", to recover digital signal when signal exceedes " threshold value ".Decision device is adjudicated when hour hands pulse arrives, and it exports the rectangular pulse digital signal being through shaping timing.Clock Extraction circuit extracts clock pulse for judgement from random pulse signal.Usual Clock Extraction circuit adopts the LC tank circuit of high Q or ultrasonic surface wave filter (SAW) or dielectric filter to extract clock, also has and adopt phase-locked loop.The effect of automatic growth control circuit is that the amplitude stabilization of maintenance output signal is to ensure that judgement is correct, its operation principle be by output signal after peak detection, the gain that resonance-amplifier is carried out in the working point controlling preamplifier is returned in negative feedback, with regulation output signal amplitude, makes it keep constant.Also regulation output signal is carried out in useful time control photodetector working point, and this method seldom adopts.Voltage conversion circuit is had with the bias voltage providing APD higher in APD optical receiver.
The effect of digital optical receiver in Digital Optical Fibre Communication System is that the faint light pulse signal of attenuation distortion after Optical Fiber Transmission is converted into electric impulse signal by light one electricity, and give enough amplifications, balanced and timing regeneration reduces the digital pulse signal becoming standard.
Photodetector is the core devices of digital optical receiver, and it converts light pulse signal to electric impulse signal.Photodetector conventional in digital fiber communication mainly contains PIN photodiode and avalanche mode photodiodes (APD).PIN photodiode does not double, and use simple, working bias voltage is low, and can immobilize, without any need for control.APD has very high inside multiplication factor, and it is combined with the electron-amplifier of appropriate design, and ADP can be made to be operated in best multiplication operating state.Such digital optical receiver can obtain the receiving sensitivity within than the digital optical receiver height 10dB of employing PIN photodetector.But because ADP needs higher working bias voltage (tens volts to two hectovolts) and multiplication characteristic to be subject to the impact of temperature comparatively serious, therefore use also more complicated.Need to utilize the working bias voltage of agc circuit to ADP to control, requiring in higher digital optical receiver, also must take temperature-compensating measure to ADP.
Preamplifier is the critical component of digital optical receiver, the Proper Match of it and photodetector, requirement can obtain available output signal-to-noise ratio signal large as far as possible theoretically, and such signal is amplified the pulse signal voltage outputting to some levels, be generally a millivolt order of magnitude.
Main amplifier is the wide-band amplifier of a high-gain, and it amplifies the small signal exported from preamplifier.In general, by main amplifier amplifying signal be substantially the output signal of undistorted preamplifier.In order to the needs of decision level, main amplifier output voltage is 1-3V (peak-to-peak value).For the defeated people's optical power signals of difference, its gain amplifier can obtain the numerical value of different size by AGC adjustment, thus ensures that its output level amplitude is constant.
Equalization filtering circuit is on the one hand to obtain the signal output waveform being conducive to adjudicating, and namely the intersymbol interference that causes of signal waveform is little, and by the requirement of equilibrium, concrete output is waveform with raised-cosine spectrum.Be that equilibrium rationally can compress the wide bandwidth of main amplifier on the other hand, and reduced the noise of digital light reception amplifier, improve its output signal-to-noise ratio.After such equilibrium, signal output waveform is delivered to decision circuit and can be obtained optimal judgement, thus obtains desirable receiving sensitivity.Object as clock extracting circuit is to adjudicate the needs with timing, and namely digital pulse signal is regenerated.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a digital optical receiver, comprising: photo-detector, preamplifier, main amplifier, equalization filtering circuit, automatic gain control circuit, decision circuit, clock extracting circuit, data outputting unit; Described photo-detector, preamplifier, main amplifier, equalization filtering circuit, decision circuit connect successively; Also automatic gain control circuit is connected with between described main amplifier, equalization filtering circuit; Described clock extracting circuit is connected with decision circuit with equalization filtering circuit respectively.
2. digital optical receiver according to claim 1, is characterized in that: described photo-detector comprises voltage supply circuit.
3. digital optical receiver according to claim 1, is characterized in that: described photo-detector adopts PIN photodiode.
4. digital optical receiver according to claim 1, is characterized in that: described photo-detector adopts avalanche type APD photodiode.
5. digital optical receiver according to claim 1, is characterized in that: described main amplifier output voltage is 1-3V.
6. digital optical receiver according to claim 1, is characterized in that: the output of described equalization filtering circuit is waveform with raised-cosine spectrum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510719552.2A CN105306147A (en) | 2015-10-30 | 2015-10-30 | Digital optical receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510719552.2A CN105306147A (en) | 2015-10-30 | 2015-10-30 | Digital optical receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105306147A true CN105306147A (en) | 2016-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510719552.2A Pending CN105306147A (en) | 2015-10-30 | 2015-10-30 | Digital optical receiver |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106027160A (en) * | 2016-07-05 | 2016-10-12 | 桂林创研科技有限公司 | Parallel optical receiver |
| CN106100729A (en) * | 2016-06-01 | 2016-11-09 | 苏州杰姆斯特机械有限公司 | A kind of short-distance wireless communication CCD energy-saving control device |
| CN106877931A (en) * | 2017-04-19 | 2017-06-20 | 成都市宏山科技有限公司 | Digital Optical Terminal based on OWDM |
| CN106972892A (en) * | 2017-05-05 | 2017-07-21 | 深圳市凯利华电子有限公司 | A kind of novel C ATV optical fiber and digitals television reception thermomechanical components |
| CN107493139A (en) * | 2017-08-11 | 2017-12-19 | 西安科锐盛创新科技有限公司 | Digital optical receiver |
| CN108551365A (en) * | 2018-03-27 | 2018-09-18 | 西安理工大学 | Wireless ultraviolet light scattering signal adaptive receiving system and method for reseptance |
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| CN102116914A (en) * | 2011-03-04 | 2011-07-06 | 中国电子科技集团公司第八研究所 | Miniaturized double-path optical module |
| CN202334774U (en) * | 2011-10-10 | 2012-07-11 | 刘超 | Uncompressed digital video optical transceiver |
| CN102594460A (en) * | 2012-02-24 | 2012-07-18 | 郭丰亮 | Deflection-type LED (light-emitting diode) optical communication transceiver |
| CN202772900U (en) * | 2012-05-25 | 2013-03-06 | 四川九州电子科技股份有限公司 | Output level control circuit for digital optical receiver |
| CN104639249A (en) * | 2013-11-12 | 2015-05-20 | 西安中科麦特电子技术设备有限公司 | Optical wireless communication receiving system |
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2015
- 2015-10-30 CN CN201510719552.2A patent/CN105306147A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116914A (en) * | 2011-03-04 | 2011-07-06 | 中国电子科技集团公司第八研究所 | Miniaturized double-path optical module |
| CN202334774U (en) * | 2011-10-10 | 2012-07-11 | 刘超 | Uncompressed digital video optical transceiver |
| CN102594460A (en) * | 2012-02-24 | 2012-07-18 | 郭丰亮 | Deflection-type LED (light-emitting diode) optical communication transceiver |
| CN202772900U (en) * | 2012-05-25 | 2013-03-06 | 四川九州电子科技股份有限公司 | Output level control circuit for digital optical receiver |
| CN104639249A (en) * | 2013-11-12 | 2015-05-20 | 西安中科麦特电子技术设备有限公司 | Optical wireless communication receiving system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100729A (en) * | 2016-06-01 | 2016-11-09 | 苏州杰姆斯特机械有限公司 | A kind of short-distance wireless communication CCD energy-saving control device |
| CN106027160A (en) * | 2016-07-05 | 2016-10-12 | 桂林创研科技有限公司 | Parallel optical receiver |
| CN106877931A (en) * | 2017-04-19 | 2017-06-20 | 成都市宏山科技有限公司 | Digital Optical Terminal based on OWDM |
| CN106972892A (en) * | 2017-05-05 | 2017-07-21 | 深圳市凯利华电子有限公司 | A kind of novel C ATV optical fiber and digitals television reception thermomechanical components |
| CN107493139A (en) * | 2017-08-11 | 2017-12-19 | 西安科锐盛创新科技有限公司 | Digital optical receiver |
| CN108551365A (en) * | 2018-03-27 | 2018-09-18 | 西安理工大学 | Wireless ultraviolet light scattering signal adaptive receiving system and method for reseptance |
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Application publication date: 20160203 |