CN105162515B - A kind of balance phase-locked loop systems and method locked mutually with data separating - Google Patents
A kind of balance phase-locked loop systems and method locked mutually with data separating Download PDFInfo
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- CN105162515B CN105162515B CN201510350695.0A CN201510350695A CN105162515B CN 105162515 B CN105162515 B CN 105162515B CN 201510350695 A CN201510350695 A CN 201510350695A CN 105162515 B CN105162515 B CN 105162515B
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Abstract
The invention discloses a kind of balance phase-locked loop systems and method locked mutually with data separating, the present invention will lock phase branch road and communications reception branch road is separated before photodetector, so that lock phase branch road couples low-noise amplifier using low-speed DC, communication leg uses high speed alternator driven coupling amplifier, so as to avoid the high-speed wideband amplifier using dc-couple.There is lock phase and communications reception flexible configuration, commercial trans-impedance amplifier can be directly used, reduce balance phaselocked loop realizes difficulty.The present invention is simple in construction, it is possible to use simple 180 ° of optical mixer units, and the light carrier being suitable in the light coherent receiver of space recovers.
Description
Technical field
The present invention relates to a kind of balance phase-locked loop systems and method locked mutually with data separating, belong to coherent light communication reception
Technology, space optical communication reception technique and laser radar technique field, are mainly used in coherent fiber communication, air free space
Between optic communication, star/star ground space optical communication and other space optical communication fields.
Background technology
Laser receiving technology based on coherent light communication is due to high receiving sensitivity, before having a wide range of applications
Scape.Applied in the speed fiber optic communication systems on ground and intersatellite high-speed digital transmission at present, be that the light of a new generation leads to
Believe reception processing technology.
Optical phase-locked loop technology is that, for one of carrier recovering method of coherent light communication, current Optical phase-locked loop technology is main
Have：Balance phaselocked loop, costas phase lock loop, judgement driving phaselocked loop and flutter phase-locked loop etc..Wherein balance phaselocked loop and tremble
Dynamic phaselocked loop is using 180 ° of optical mixer units, and structure is relatively simple；Costas phase lock loop and judgement movement phaselocked loop are needed to use
90 ° of optical mixer units, it makes complicated, and difficulty is high.Balanced type phase-locked loop structures are the simplest, but deposit not enough both ways：One
Aspect needs modulated signal residual carrier information, is on the other hand that opto-electronic receiver needs dc-couple.The former introduces a certain amount of
Power loss (<0.5dB), and the latter need use High-speed DC coupling amplifier.For the latter, do not possess the straight of commercialization at present
Flow coupling high-speed trans-impedance amplifier, the main Microwave Wide-Band Amplifier using 50 Europe load matcheds.Due to the heat of photodetector
Noise is inversely proportional with load resistance, causes the dc-couple amplifier output noise using the load of 50 Europe larger, have impact on reception
The sensitivity of machine.In addition, current 50 Europe load matched, the Microwave Wide-Band Amplifier of dc-couple are due to needing dc-couple, and
The main flow occupation mode of non-microwave amplifier, it is difficult to design, and be easily destroyed microwave amplifier.Thus need a kind of modified
Phaselocked loop is balanced, the characteristics of effectively can utilizing optical branching makes lock phase and data receiver use different light paths, so that will be above-mentioned straight
Flow coupled problem to solve, directly photoelectric current can be amplified using commercial trans-impedance amplifier, its implementation complexity and connect
The balance Optical phase-locked loop that sensitivity is better than classics is received, prior art can not be solved.
The content of the invention
Present invention solves the technical problem that being：Overcoming prior art not enough, there is provided a kind of balance locked mutually with data separating
Phase-locked loop systems and method, using lock mutually and the modified of data separating balances phaselocked loop, by after the mixer, optical detection
Light is subjected to branch before device, realize lock mutually separate with data receiver, can effectively using optical branching the characteristics of, make lock phase with
Data receiver uses different light paths, so that by dc-couple Resolving probiems, can be directly using commercial trans-impedance amplifier to light
Electric current is amplified, and its implementation complexity and receiving sensitivity are better than classical balance Optical phase-locked loop.
The technical scheme that the present invention is solved is：A kind of balance phase-locked loop systems locked mutually with data separating, including：180 ° of light
Frequency mixer, local oscillator laser, spectroscope, balance photodetector, low-speed DC coupling trans-impedance amplifier and high speed alternator driven coupling
Trans-impedance amplifier；
The local oscillator laser signal that the optical signal of external reception is produced with local oscillator laser is mixed by 180 ° of optical mixer units
After deliver to two spectroscopes, 0 ° in the optical signal after mixing and 180 ° of optical signals are carried out light splitting, obtained by two spectroscopes respectively
To small splitting ratio optical signal and big splitting ratio optical signal, 0 ° in small splitting ratio optical signal and 180 ° of optical signals are delivered into balance light
Electric explorer, balance photodetector is carried out after opto-electronic conversion to 0 ° in the optical signal after mixing light splitting and 180 ° of optical signals,
Small 0 ° and 180 ° electric signals of splitting ratio are respectively obtained, low-speed DC coupling trans-impedance amplifier are delivered to, by low-speed DC coupling across resistance
Amplifier is filtered to the small 0 ° and 180 ° electric signal amplifications of splitting ratio, is produced phase error signal and is delivered to loop filter, loop
Wave filter is controlled according to the phase error signal to local oscillator laser, realizes the optical signal and local oscillator laser signal received
Phase synchronization；0 ° in big splitting ratio optical signal and 180 ° of optical signals deliver to balance photodetector, balance photodetector pair
After 0 ° in big splitting ratio optical signal and 180 ° of optical signals progress opto-electronic conversions, big 0 ° and 180 ° telecommunications of splitting ratio are respectively obtained
Number, high speed alternator driven coupling trans-impedance amplifier is delivered to, trans-impedance amplifier is coupled to the big 0 ° and 180 ° electricity of splitting ratio by high speed alternator driven
Signal is amplified, as the output of system, for clock and data recovery.
The modulation format for receiving the external optical signal is intensity-modulated signal or phase modulated signal.
0 ° in optical signal after mixing and 180 ° of optical signals are carried out light splitting by described two spectroscopes respectively, and what is obtained is small
Splitting ratio signal, the small splitting ratio signal is the letter of the power 50% less than 0 ° and 180 ° optical signal in the optical signal after mixing
Number；0 ° in optical signal after mixing and 180 ° of optical signals are carried out light splitting by two spectroscopes respectively, obtained big splitting ratio letter
Number, the big splitting ratio signal is the signal more than 0 ° and 180 ° optical signal power 50% in the optical signal after mixing.
The low-speed DC coupling trans-impedance amplifier is trans-impedance amplifier, and is Low-Pass Filter amplifier, is inputted as direct current coupling
Close, it is necessary to be amplified to DC component, and only allow the low frequency component less than 1MHz to be amplified by amplifier.
The High-speed DC coupling trans-impedance amplifier is trans-impedance amplifier, and is high-pass type amplifier, in input signal
DC component blocked, only allow to be amplified the high fdrequency component more than 1MHz.
A kind of balance phase-locked loop method locked mutually with data separating, step is as follows：
(1) 180 ° of optical mixer unit is mixed the local oscillator laser signal that the optical signal of external reception and local oscillator laser are produced
Two spectroscopes are delivered to after frequency；
0 ° in optical signal after step (1) mixing and 180 ° of optical signals are carried out light splitting by (2) two spectroscopes respectively, are obtained
To small splitting ratio optical signal and big splitting ratio optical signal；
(3) 0 ° in the small splitting ratio optical signal of step (2) and 180 ° of optical signals are delivered into balance photodetector, balanced
Photodetector is carried out after opto-electronic conversion to 0 ° in the optical signal after mixing light splitting and 180 ° of optical signals, respectively obtains small light splitting
Than 0 ° and 180 ° of electric signals, low-speed DC coupling trans-impedance amplifier is delivered to, trans-impedance amplifier is coupled to this small point by low-speed DC
Light produces phase error signal and delivers to loop filter, loop filter is according to the phase than 0 ° and 180 ° of electric signal amplification filtering
Position error signal is controlled to local oscillator laser, realizes the Phase synchronization of the optical signal received and local oscillator laser signal；
(4) 0 ° in the big splitting ratio optical signal of step (2) and 180 ° of optical signals are delivered into balance photodetector, balances light
Electric explorer is carried out after opto-electronic conversions to 0 ° in big splitting ratio optical signal and 180 ° of optical signals, respectively obtain 0 ° of big splitting ratio and
180 ° of electric signals, deliver to high speed alternator driven coupling trans-impedance amplifier, trans-impedance amplifier are coupled to big 0 ° of the splitting ratio by high speed alternator driven
It is amplified with 180 ° of electric signals, as the output of system, for clock and data recovery.
The advantage of the present invention compared with prior art is：
(1) present invention will lock phase branch road and communications reception branch road is separated before photodetector so that lock phase branch road is used
Low-speed DC couples low noise amplifier, and communication leg uses high speed alternator driven coupling amplifier, dc-couple is used so as to avoid
High-speed wideband amplifier.There is lock phase and communications reception flexible configuration, commercial trans-impedance amplifier can be directly used,
Reduce balance phaselocked loop realizes difficulty.
(2) small splitting ratio branch road of the invention can also use the photodetector based on position sensing, for hot spot position
Detection is put, the photodetector based on position sensing is used, it is possible to achieve the receiver of Tracking And Communications integration, reduces optocoupler
The difficulty of conjunction.
(3) splitting ratio used in the present invention is variable, is defined by the splitting ratio of system final optimization pass, can be with flexible design point
Light ratio, if the splitting ratio of increase lock phase branch road, can increase the closed loop stability of phaselocked loop, optimize receiver performance.
During 10% light splitting, light splitting brings 0.5dB to lose receiving sensitivity；When 5% light splitting, light splitting is brought to receiving sensitivity
0.22dB loses.
(4) the modulation format no requirement (NR) in the present invention to reception optical signal, can be intensity-modulated signal or phase
Position modulated signal, it is more flexible to modulation system, can be compatible for OOK, BPSK and DPSK modulated signal, with compatibility
Strong advantage.
Brief description of the drawings
Fig. 1 is system block diagram of the invention；
Fig. 2 is flow chart of the method for the present invention.
Embodiment
The present invention basic ideas be：A kind of balance phase-locked loop systems and method locked mutually with data separating are provided, for
Balance Optical phase-locked loop needs the shortcoming of High-speed DC coupling amplifier, and innovation of the invention is by being used before photodetection
The mode of optical branching, lock is mutually separated with data receiving light path, so that lock is mutually put with data receiver using different detections
Big circuit so that communication leg can use AC commercial to couple trans-impedance amplifier and realize, it is to avoid complicated dc-couple across
Impedance amplifier and the corresponding noise brought.
The present invention is described in further detail below in conjunction with the accompanying drawings, is as shown in Figure 1 system block diagram, one kind lock phase sum
According to the balance phase-locked loop systems of separation, including：It is 180 ° of optical mixer units, local oscillator laser, spectroscope, balance photodetector, low
Fast dc-couple trans-impedance amplifier and high speed alternator driven couple trans-impedance amplifier；
The local oscillator laser signal that the optical signal of external reception is produced with local oscillator laser is mixed by 180 ° of optical mixer units
After deliver to two spectroscopes, 0 ° in the optical signal after mixing and 180 ° of optical signals are carried out light splitting, obtained by two spectroscopes respectively
To small splitting ratio optical signal and big splitting ratio optical signal, 0 ° in small splitting ratio optical signal and 180 ° of optical signals are delivered into balance light
Electric explorer, balance photodetector is carried out after opto-electronic conversion to 0 ° in the optical signal after mixing light splitting and 180 ° of optical signals,
Small 0 ° and 180 ° electric signals of splitting ratio are respectively obtained, low-speed DC coupling trans-impedance amplifier are delivered to, by low-speed DC coupling across resistance
Amplifier is filtered to the small 0 ° and 180 ° electric signal amplifications of splitting ratio, is produced phase error signal and is delivered to loop filter, loop
Wave filter is controlled according to the phase error signal to local oscillator laser, realizes the optical signal and local oscillator laser signal received
Phase synchronization；0 ° in big splitting ratio optical signal and 180 ° of optical signals deliver to balance photodetector, balance photodetector pair
After 0 ° in big splitting ratio optical signal and 180 ° of optical signals progress opto-electronic conversions, big 0 ° and 180 ° telecommunications of splitting ratio are respectively obtained
Number, high speed alternator driven coupling trans-impedance amplifier is delivered to, trans-impedance amplifier is coupled to the big 0 ° and 180 ° electricity of splitting ratio by high speed alternator driven
Signal is amplified, as the output of system, for clock and data recovery.
It is illustrated in figure 2 specific method flow：A kind of balance phase-locked loop method locked mutually with data separating, step is as follows：
(1) 180 ° of optical mixer unit is mixed the local oscillator laser signal that the optical signal of external reception and local oscillator laser are produced
Spectroscope is delivered to after frequency；
(2) 0 ° in the optical signal after step (1) mixing and 180 ° of optical signals are carried out light splitting by spectroscope respectively.The present invention
Innovation be that the light splitting after frequency mixer so that lockin signal is separated with signal of communication before photodetection,
So as to which unlike signal uses different ways and means, the performance of lock phase branch road and communication leg is improved.Phase branch road is locked using low
Fast dc-couple low-noise amplifier, communication leg couples trans-impedance amplifier using high speed alternator driven, it is to avoid used dc-couple
High speed amplifier.And dc-couple high speed amplifier realizes that difficulty is big, and gain and noise objective be weaker than AC coupled across
Impedance amplifier, realizes the noise vs of amplification for this method with not light splitting as shown in table 1, as seen from the table, after using light splitting
Because communication leg employs high speed alternator driven coupling trans-impedance amplifier so that it inputs thermal noise electric current and declined.For the present invention
High speed AC coupled trans-impedance amplifier is using height in the case of resistance, and thermal noise electric current can descend to the 1/ of prior art
10.Splitting ratio depends on actual system behavior, in order to maximize system reception sensitivity, it is desirable to lock phase branch road splitting ratio and be less than
50%, communication leg splitting ratio is more than 50%.Typically splitting ratio is：Lock phase branch road 10%, communication leg 90%, such light splitting
So that because the loss of sensitivity that light splitting is introduced is only 0.5dB；
The noise current noise mean square value contrast table of amplification is realized in the light splitting of table 1 with not light splitting
| Light splitting | Current noise mean-square value (μ A) |
| Non- light splitting | 0.91 |
| Light splitting (across resistance 1k Ω) | 0.20 |
| Light splitting (across resistance 2k Ω) | 0.14 |
| Light splitting (across resistance 5k Ω) | 0.09 |
As it can be seen from table 1 the present invention is using after light splitting, because communication leg employs high speed alternator driven coupling across resistance amplification
Device, can be by increasing across resistance so that input thermal noise electric current (being represented with current noise mean-square value (μ A)) declines.
(3) step (2) small splitting ratio mixing after optical signal in 0 ° and 180 ° of optical signals deliver to balance photodetection
Device, balance photodetector is carried out after opto-electronic conversion to 0 ° in the optical signal after the mixing light splitting and 180 ° of optical signals, is obtained
0 ° and 180 ° of electric signals in the optical signal after light splitting are mixed, low-speed DC coupling trans-impedance amplifier are delivered to, by low-speed DC coupling
Close trans-impedance amplifier to filter 0 ° in the optical signal after the mixing light splitting and 180 ° of electric signal amplifications, produce phase error signal
Loop filter is delivered to, loop filter is controlled according to the phase error signal to local oscillator laser, realizes light carrier phase
Bit synchronization；The small splitting ratio branch road of the present invention can also use the photodetector based on position sensing to replace balance photodetection
Device, for facula position detection, uses the photodetector based on position sensing, it is possible to achieve Tracking And Communications integration, subtracts
The difficulty of small optical coupling.
(4) in the optical signal after the big splitting ratio mixing of step (2) 0 ° and 180 ° of optical signals deliver to balance photodetector,
Balanced detector is carried out after opto-electronic conversion to 0 ° in the optical signal after mixing light splitting and 180 ° of optical signals, is obtained after mixing light splitting
Optical signal in 0 ° and 180 ° of electric signals, deliver to high speed alternator driven coupling trans-impedance amplifier, by high speed alternator driven coupling across resistance amplify
Device is amplified to 0 ° in the optical signal after the mixing light splitting and 180 ° of electric signals, as the output of system, for clock and
Data recovery.
The characteristics of present invention effectively can utilize optical branching, makes lock phase and data receiver use different light paths, so that will be straight
Flow coupled problem to solve, directly photoelectric current can be amplified using commercial trans-impedance amplifier, reduce balance phaselocked loop
Realize difficulty, implementation complexity and receiving sensitivity are better than the balance Optical phase-locked loop of classics.The present invention is simple in construction, can
To utilize simple 180 ° of optical mixer units, the light carrier being suitable in the light coherent receiver of space recovers.
Non-elaborated part of the present invention belongs to techniques well known.
Claims (6)
1. a kind of balance phase-locked loop systems locked mutually with data separating, it is characterised in that：Including：180 ° of optical mixer units, local oscillators swash
Light device, spectroscope, balance photodetector 1, balance photodetector 2, low-speed DC coupling trans-impedance amplifier and high speed alternator driven
Couple trans-impedance amplifier；
180 ° of optical mixer units are sent after the local oscillator laser signal that the optical signal of external reception is produced with local oscillator laser is mixed
To two spectroscopes, 0 ° in the optical signal after mixing and 180 ° of optical signals are carried out light splitting by two spectroscopes respectively, obtain small
Splitting ratio optical signal and big splitting ratio optical signal, deliver to balance photoelectricity by 0 ° in small splitting ratio optical signal and 180 ° of optical signals and visit
Survey after 0 ° in device 1, the optical signal that 1 pair of balance photodetector is mixed after light splitting and 180 ° of optical signals progress opto-electronic conversions, point
Small 0 ° and 180 ° electric signals of splitting ratio are not obtained, are delivered to low-speed DC coupling trans-impedance amplifier, are put by low-speed DC coupling across resistance
Big device is filtered to the small 0 ° and 180 ° electric signal amplifications of splitting ratio, is produced phase error signal and is delivered to loop filter, loop filter
Ripple device is controlled according to the phase error signal to local oscillator laser, realizes the phase of the optical signal received and local oscillator laser signal
Bit synchronization；0 ° in big splitting ratio optical signal and 180 ° of optical signals deliver to balance photodetector 2,2 pairs of photodetector of balance
After 0 ° in big splitting ratio optical signal and 180 ° of optical signals progress opto-electronic conversions, big 0 ° and 180 ° telecommunications of splitting ratio are respectively obtained
Number, high speed alternator driven coupling trans-impedance amplifier is delivered to, trans-impedance amplifier is coupled to the big 0 ° and 180 ° electricity of splitting ratio by high speed alternator driven
Signal is amplified, as the output of system, for clock and data recovery.
2. the balance phase-locked loop systems of a kind of lock phase and data separating according to its claim 1, it is characterised in that：Receive
The modulation format of the external optical signal is intensity-modulated signal or phase modulated signal.
3. the balance phase-locked loop systems of a kind of lock phase and data separating according to its claim 1, it is characterised in that：It is described
0 ° in optical signal after mixing and 180 ° of optical signals are carried out light splitting by two spectroscopes respectively, obtain small splitting ratio signal, should
Small splitting ratio signal is 50% signal less than 0 ° and 180 ° optical signal power in the optical signal after mixing；Two spectroscopes
0 ° in optical signal after mixing and 180 ° of optical signals are subjected to light splitting respectively, obtained big splitting ratio signal, the big splitting ratio
Signal is the signal of the power 50% more than 0 ° and 180 ° optical signal in the optical signal after mixing.
4. the balance phase-locked loop systems of a kind of lock phase and data separating according to its claim 1, it is characterised in that：It is described
Low-speed DC coupling trans-impedance amplifier is trans-impedance amplifier, and is Low-Pass Filter amplifier, is inputted as dc-couple, it is necessary to direct current
Component is amplified, and only allows the low frequency component less than 1MHz to be amplified by amplifier.
5. the balance phase-locked loop systems of a kind of lock phase and data separating according to its claim 1, it is characterised in that：It is described
High speed alternator driven coupling trans-impedance amplifier is trans-impedance amplifier, and is high-pass type amplifier, and the DC component in input signal is entered
Row is blocked, and only allows to be amplified the high fdrequency component more than 1MHz.
6. a kind of balance phase-locked loop method locked mutually with data separating, it is characterised in that step is as follows：
After the local oscillator laser signal that the optical signal of external reception and local oscillator laser are produced is mixed by (1) 180 ° of optical mixer unit
Deliver to two spectroscopes；
0 ° in optical signal after step (1) mixing and 180 ° of optical signals are carried out light splitting by (2) two spectroscopes respectively, obtain small
Splitting ratio optical signal and big splitting ratio optical signal；
(3) 0 ° in the small splitting ratio optical signal of step (2) and 180 ° of optical signals are delivered into balance photodetector 1, balances light
0 ° in optical signal after the mixing light splitting of 1 pair of electric explorer and 180 ° of optical signals are carried out after opto-electronic conversions, respectively obtain small light splitting
Than 0 ° and 180 ° of electric signals, low-speed DC coupling trans-impedance amplifier is delivered to, trans-impedance amplifier is coupled to this small point by low-speed DC
Light produces phase error signal and delivers to loop filter, loop filter is according to the phase than 0 ° and 180 ° of electric signal amplification filtering
Position error signal is controlled to local oscillator laser, realizes the Phase synchronization of the optical signal received and local oscillator laser signal；
(4) 0 ° in the big splitting ratio optical signal of step (2) and 180 ° of optical signals are delivered into balance photodetector 2, balances photoelectricity
0 ° in the 2 pairs big splitting ratio optical signal of detector and 180 ° of optical signals are carried out after opto-electronic conversions, respectively obtain 0 ° of big splitting ratio and
180 ° of electric signals, deliver to high speed alternator driven coupling trans-impedance amplifier, trans-impedance amplifier are coupled to big 0 ° of the splitting ratio by high speed alternator driven
It is amplified with 180 ° of electric signals, as the output of system, for clock and data recovery.
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| CN107132663B (en) * | 2017-06-14 | 2019-05-07 | 长春理工大学 | 90 ° of frequency mixers of spatial light that splitting ratio adaptively regulates and controls |
| CN112857564A (en) * | 2019-11-28 | 2021-05-28 | 余姚舜宇智能光学技术有限公司 | Photoelectric detector circuit system and photoelectric detection method |
| CN111856481B (en) * | 2020-07-29 | 2021-07-06 | 杭州视光半导体科技有限公司 | Scanner and coaxial and non-coaxial radar system applying same |
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| CN101997611A (en) * | 2009-08-20 | 2011-03-30 | 华为技术有限公司 | Frequency tracking method, device and coherent detection receiving device |
| CN103532627A (en) * | 2013-09-16 | 2014-01-22 | 西南交通大学 | Phase stabilizing device for long-distance optical-fiber transmission of unknown microwave signals |
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| US7058312B2 (en) * | 2001-05-31 | 2006-06-06 | Agere Systems Inc. | Opto-electronic phase-locked loop with microwave mixing for clock recovery |
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| CN101997611A (en) * | 2009-08-20 | 2011-03-30 | 华为技术有限公司 | Frequency tracking method, device and coherent detection receiving device |
| CN103532627A (en) * | 2013-09-16 | 2014-01-22 | 西南交通大学 | Phase stabilizing device for long-distance optical-fiber transmission of unknown microwave signals |
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