CN109581701A - A kind of real-time stability maintenance system and method for light intensity modulation - Google Patents
A kind of real-time stability maintenance system and method for light intensity modulation Download PDFInfo
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- CN109581701A CN109581701A CN201811517277.6A CN201811517277A CN109581701A CN 109581701 A CN109581701 A CN 109581701A CN 201811517277 A CN201811517277 A CN 201811517277A CN 109581701 A CN109581701 A CN 109581701A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0327—Operation of the cell; Circuit arrangements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0305—Constructional arrangements
Abstract
The application provides a kind of real-time stability maintenance system and method for light intensity modulation, and wherein the real-time stability maintenance system of the application includes operating laser, beam splitting arrangement, intensity modulator, beam merging apparatus, reference laser diode and light intensity monitor；The reference combiner that beam merging apparatus is used to receive is opposite with work optical propagation direction with reference to optical propagation direction to main optical path；Light intensity monitor is used for the end the DC voltage or the end RF voltage of the average optical power value Real-time Feedback adjusting strength modulator of the modulation reference light according to measurement, and the light intensity of the modulation work light of output is made to meet system requirements.The application can control a light pulse comprising a kind of intensity after the light modulation that reference laser diode emits in a certain period of time, the intensity of modulation reference light and the intensity of reference light that the voltage at the end DC or the end RF that therefore can adjust IM according to the average light power of modulation reference light exports it meet the requirements, and realize real-time, efficient light intensity modulation stability maintenance.
Description
Technical field
This application involves light intensity modulation technical fields, and in particular to a kind of real-time stability maintenance system of light intensity modulation and side
Method.
Background technique
In optical communication field, it usually needs use intensity modulator (Intensity Modulator, IM) to luminous intensity into
The stable modulation of row, lithium columbate crystal is as a kind of excellent lateral Electro-optical Modulation material, because its driving voltage is low, insertion loss
It is small, spectral working range is wide, extinction ratio is high and is easy to the advantages that being mass produced, be widely used.Intensity modulator
Electro-optical Modulation is mainly utilized, using the linear change of voltage control fiber waveguide refractive index, makes have phase by the light wave of the waveguide
Displacement is dynamic, to realize phase-modulation.Simple phase-modulation is unable to the intensity of modulation light, by comprising two phase-modulators and
The M-Z interferometer type modulator that two y branch waveguides are constituted realizes intensity modulated.The inside of M-Z interferometer type intensity modulator
Structure determines that it can drift about to the modulation result of luminous intensity with the variation of external environment, so needing to luminous intensity tune
System carries out stability maintenance design.
A kind of stability maintenance system of existing light intensity modulation is as shown in Figure 1, the stability maintenance system includes operating laser 10, divides
Beam device 20, intensity modulator 30 and light intensity monitor 60；The intensity modulator 30 receives the operating laser 10 and issues
Light, the end the RF voltage of the intensity modulator 30 needs voltage to be loaded to be associated with operating laser 10, and to reception
Light be modulated, export modulation light；The beam splitter 20 receives modulation light, and is split to modulation light, a part modulation
For light for communicating, another part modulation light is sent to light intensity monitor 60；The light intensity monitor 60 measures the power of modulation light
Value, and intensity stability maintenance is carried out according to the quiescent potential of the result feedback regulation intensity modulator 30 of the performance number.
But the stability maintenance system of existing light intensity modulation has the disadvantage that
Existing stability maintenance system is that the average light power of modulation work light modulated to IM measures, the DC of feedback regulation IM
Voltage is held to maintain the stabilization of average light power.Since the modulated light pulse of existing stability maintenance systematic survey is working laser
Therefore the light that device 10 issues in the average light power of measurement modulation work light, contains two in the energy of average light power
The light pulse of kind or a variety of varying strengths.For example, unmodulated work luminous intensity is 1, when a length of t1 period in, modulation
Work include in the pulse of light 10 intensity 0.5 light pulse, when a length of t1 subsequent time period in, the end the DC voltage of IM is sent out
Drift has been given birth to, the light pulse in the pulse of work light comprising 5 intensity 0.6 and 5 intensity 0.4 is modulated, however it is flat in measurement
When equal optical power, the average light power in this two period is identical, and the end the DC voltage that such case will lead to IM has drifted about
, but since the average light power of detection may not change, existing stability maintenance system average optical power value is simultaneously
It cannot be guaranteed that the intensity stabilization of each modulating light pulse.
Summary of the invention
The application provides a kind of real-time stability maintenance system and method for light intensity modulation, can be according to the average light of modulation reference light
Performance number carries out real-time, efficient light intensity modulation stability maintenance, solves existing stability maintenance system according to the average light of modulation work light
Power cannot be guaranteed the problem of intensity stabilization of each modulation work light.
The application's in a first aspect, provide a kind of real-time stability maintenance system of light intensity modulation, comprising: operating laser divides
Bundle device, intensity modulator, beam merging apparatus, reference laser diode and light intensity monitor；
Operating laser is for issuing work light；
Reference laser diode is for issuing reference light；
Reference light is transmitted to intensity modulator one end, work to main optical path by the reference combiner that beam merging apparatus is used to receive
Make light and be transmitted to the intensity modulator other end after beam splitting arrangement, and with reference to optical propagation direction and work optical propagation direction phase
Instead；
Intensity modulator is used to be modulated work light, output modulation work light；Or reference light is modulated, output is adjusted
Reference light processed；
Beam splitting arrangement is separated from main optical path for that will modulate reference light；
Light intensity monitor is used to receive the average optical power value Real-time Feedback of modulation reference light and the modulation reference light according to measurement
The end the DC voltage or the end RF voltage of adjusting strength modulator make the light intensity of the modulation work light of output meet system requirements.
Preferably, when operating laser is identical as the wavelength for the light that reference laser diode emits, the beam splitting arrangement and
Beam merging apparatus is optical circulator.
Preferably, when the wavelength of operating laser and the light of reference laser diode transmitting is not identical, the beam splitting arrangement is
Optical circulator or dense wave division multiplexer, the beam merging apparatus are optical circulator or dense wave division multiplexer.
Preferably, the light intensity monitor includes light intensity detection module, fuzzy PID algorithm module and bias voltage control mould
Block；
The fuzzy PID algorithm module is connected with the light intensity detection module and bias control module respectively, the light intensity inspection
It surveys module to be connected with the beam splitting arrangement, the bias control module is connected with the intensity modulator；
Average optical power value of the light intensity detection module for the modulation reference light of measurement；
The fuzzy PID algorithm module is used for the bias according to the average optical power value real-time control of the modulation reference light of measurement
Control module carries out perturbation to the voltage at the end DC, is adjusted to the voltage at the end DC or the voltage at the end RF is adjusted.
The second aspect of the application provides a kind of real-time stability maintenance method of light intensity modulation, is applied to above-mentioned any one
Real-time stability maintenance system, including,
The voltage status that S1 is loaded according to the end RF of intensity modulator controls the luminance of reference laser diode, measurement modulation ginseng
Examine the average optical power value of light；
S2 makes output according to the voltage at the end DC of the average optical power value adjusting strength modulator of measurement or the voltage at the end RF
The light intensity of modulation work light meets system requirements.
Preferably, step S1 includes,
S101 is in t1In period, when the voltage that the end RF of intensity modulator loads is a kind of voltage, the reference laser is controlled
Device shines, and when the voltage that the end RF of intensity modulator loads is other voltages, controls the reference laser diode and does not shine, measures
Modulate the average optical power value P of reference light1；
S102 is in t2In period, when the voltage that the end RF of intensity modulator loads is another voltage, controls the reference and swash
Light device shines, and when the voltage that the end RF of intensity modulator loads is other voltages, controls the reference laser diode and does not shine, surveys
The average optical power value P of amount modulation reference light2。
Preferably, step S2 includes,
S201 is by P1With P2It is compared, if P1/P2Outside preset threshold range, then the electricity at the end DC of intensity modulator is adjusted
The voltage at pressure value or the end RF, until the P of feedback1/P2In threshold range；
S202 repeats step S101, S102 and S201, maintains the voltage at the end DC to make P in real time1/P2In threshold range, or
The voltage for adjusting the end RF makes P1/P2In threshold range.
Preferably, step S1 and S2 includes,
S11 controls the reference laser diode and shines, intensity modulator is arranged when the end RF of intensity modulator is not loaded with voltage
The average light power maximum P of modulation reference light is found out in the stepping of the end DC voltage0And P0The corresponding end DC voltage VDC, by DC
End voltage is set as VDC；
S12 controls the reference laser diode and does not shine when the end the RF on-load voltage of intensity modulator；
S13 carries out perturbation to the voltage at the end DC, successively measures the average optical power value P of the modulation reference lightn, until measurement
PnIn can find out maximum Pm, by PmIt is stored into P0In, by PmCorresponding voltage VmIt is stored into VDCIn, wherein the stepped voltage is
The voltage of identical stepping, 0 < m < n, m, n are positive integer.
DC terminal voltage value is adjusted to the V of step S13 measurement by S14DC；
S15 continues to carry out perturbation to the voltage at the end DC, until the P measured again according to the method for step S13nIn can find out pole
Big value Pm, by PmIt is stored into P0In, by PmCorresponding voltage VmIt is stored into VDCIn, DC terminal voltage value is adjusted to V againDC, so heavy
The multiple step, maintaining the voltage at the end DC in real time is the voltage V for exporting average light power maximumDC。
Preferably, the voltage to the end DC carries out perturbation and includes:
When first time perturbation is to add stepped voltage on the basis of the voltage at the current end DC, second of perturbation is micro- for the first time
Stepped voltage is added on the basis of the voltage disturbed, if P1>P2, then the later perturbation of third time is on the basis of first time perturbation
Stepped voltage is successively subtracted, if P1<P2, then the later perturbation of third time is on the basis of second of perturbation successively plus stepping electricity
Pressure.
As it can be seen from the above scheme the application provides a kind of real-time stability maintenance system and method for light intensity modulation, wherein this Shen
Real-time stability maintenance system please includes operating laser, beam splitting arrangement, intensity modulator, beam merging apparatus, reference laser diode and light
Strong monitor；Reference light is transmitted to intensity modulator one to main optical path by the reference combiner that beam merging apparatus is used to receive
End, work light are transmitted to the intensity modulator other end after beam splitting arrangement, and with reference to optical propagation direction and work light propagation
It is contrary；Strong monitor is used to receive modulation reference light and anti-in real time according to the average optical power value for modulating reference light of measurement
The voltage for presenting adjusting strength modulator or the end RF makes the light intensity of the modulation work light of output meet system requirements.
The real-time stability maintenance system of the application includes two lasers, and the work light of operating laser transmitting is joined for communicating
The reference light of laser transmitting is examined for stability maintenance, light intensity monitor can measure the average optical power value of modulation reference light.Therefore, originally
The stability maintenance system of application only includes a kind of intensity after can control the light modulation that reference laser diode emits in a certain period of time
Light pulse, the drift situation of operating point of IM can be reflected by measuring its average light power for modulating reference light, be joined according to modulation
The average light power for examining light, the intensity for making it modulate reference light by adjusting the voltage at the end DC of IM meet the requirements, or adjust IM
The end RF voltage make its export the intensity of modulation reference light and the intensity of reference light meet the requirements, it will be able to guarantee often
The intensity of a modulation work light meets system requirements, realizes real-time, efficient light intensity modulation stability maintenance.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is a kind of structural schematic diagram of stability maintenance system in the prior art；
Fig. 2 is a kind of real-time stability maintenance system structure diagram of the embodiment of the present application；
Fig. 3 is a kind of structural schematic diagram of light intensity monitor of the embodiment of the present application；
Fig. 4 is a kind of working principle curve graph of the intensity modulator of real-time stability maintenance system of the embodiment of the present application；
Fig. 5 is the working principle curve graph after a kind of intensity modulator operating point drift of stability maintenance system of the embodiment of the present application；
Fig. 6 is a kind of schematic illustration of real-time stability maintenance method of the embodiment of the present application；
Fig. 7 is the schematic illustration of the another kind method of stability maintenance in real time of the embodiment of the present application；
Fig. 8 is the schematic illustration that the voltage at a kind of pair of end DC of the embodiment of the present application is adjusted.
10- operating laser, 20- beam splitting arrangement, 30- intensity modulator, 40- beam merging apparatus, 50- reference laser diode, 60-
Light intensity monitor, 601- light intensity detection module, 602- fuzzy PID algorithm module, 603- bias control module.
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing and it is specific real
Applying mode, the present application will be further described in detail.
Real-time stability maintenance system structure diagram shown in Figure 2, the embodiment of the present application provide a kind of light intensity modulation
Real-time stability maintenance system, comprising: operating laser 10, beam splitting arrangement 20, intensity modulator 30, beam merging apparatus 40, reference laser diode
50 and light intensity monitor 60；Operating laser 10 is for issuing work light；Reference laser diode 50 is for issuing reference light.Work
Light is for communicating, and reference light is used for stability maintenance, thus reference light has little effect work light, therefore the real-time stability maintenance of the application
System can carry out stability maintenance work in the case where not influencing communication efficiency.
Reference light is transmitted to intensity modulator 30 to main optical path by the reference combiner that beam merging apparatus 40 is used to receive
One end, work light are transmitted to 30 other end of intensity modulator after beam splitting arrangement 20, and with reference to optical propagation direction and work
Optical propagation direction is opposite；Intensity modulator 30 is used to be modulated work light, output modulation work light；Or to reference light into
Row modulation, output modulation reference light；Beam splitting arrangement 20 is separated from main optical path for that will modulate reference light；Light intensity monitor
60 for receiving modulation reference light and being modulated according to the average optical power value Real-time Feedback adjusting strength of the modulation reference light of measurement
The end the DC voltage or the end RF voltage of device 30 make the light intensity of the modulation work light of output meet system requirements.
After the operating point of intensity modulator 30 drifts about, the voltage of work at present is being not the work of intensity modulator 30
Make the corresponding voltage of point, the average light power of the modulation reference light caused changes.Thus light intensity monitor 60 passes through
The average optical power value of measurement modulation reference light, the voltage at the end feedback regulation DC or the voltage at the end RF, make the modulation work of output
The light intensity for making light meets system requirements.In addition, the stability maintenance system of the application can control reference laser diode 50 in certain time period
It only include a kind of light pulse of intensity after the light modulation of interior transmitting, measuring its average light power for modulating reference light can reflect
The drift situation of the operating point of intensity modulator 30 passes through adjusting strength modulator according to the average light power of modulation reference light
The voltage at 30 end DC modulates it, and intensity of reference light meets the requirements or the voltage at the end RF of adjusting strength modulator 30 makes it
The intensity of modulation reference light and the intensity of reference light of output meet the requirements, it will be able to guarantee the strong of each modulation work light
Degree meets system requirements, realizes real-time, efficient light intensity modulation stability maintenance.
In addition, existing stability maintenance systematic survey is the light of the sending of operating laser 10, and measure the hair of operating laser 10
The parameter for the light penetrated is fixed, therefore can not define the meaning of parameters of measurement.The stability maintenance systematic survey of the application is with reference to sharp
The light that light device 50 issues, reference laser diode 50 can shine independently of operating laser 10, not influenced by operating laser 10.
For example, the application can control the intensity that reference laser diode 50 changes the reference light of transmitting according to the requirement of light intensity monitor 60
And/or wavelength, to make light intensity monitor 60 be in optimal measurement range.The application can also control reference laser diode 50
Luminance, for example, when intensity modulator 30 the end RF load a certain voltage when, reference laser diode 50 just issues reference light,
Thus the intensity of the modulation reference light of measurement can be mapped with the intensity of the modulation work light at the moment, to also can
Reflect the situation of the intensity of each modulation work light.The application can also control the luminance of reference laser diode 50, so that
In different times in section, the luminance of reference laser diode 50 is different, so as to measure a variety of average optical power values, passes through
Whether the comparison between two kinds of average optical power values, the intensity for reflecting modulation work light meet system requirements.The application may be used also
To emit single pulse by controlling in 50 certain period of time of reference laser diode, thus the draw light function of the modulation reference light of measurement
Rate represents the light intensity of modulation reference light, to reflect the light intensity of corresponding modulation work light.
Preferably, the beam merging apparatus of the application can be dense wave division multiplexer or other common wavelength division components, can also
To be optical circulator, as long as combiner can will be referred to main optical path.The beam splitting arrangement of the application can be dense wavelength division
Multiplexer or other common wavelength division components, are also possible to optical circulator, as long as can isolate reference light from main optical path
Come.
Specifically, when operating laser 10 is identical as the wavelength of light that reference laser diode 50 emits, the beam splitting dress
Set 20 and beam merging apparatus 40 be optical circulator.Or the wavelength when operating laser 10 and the light of the transmitting of reference laser diode 50
When not identical, the beam splitting arrangement 20 be optical circulator or dense wave division multiplexer, the beam merging apparatus 40 be optical circulator or
Dense wave division multiplexer.
In addition, the beam merging apparatus can will refer to optical fiber where being optically coupled to work light, and make with reference to optical transport
Direction and work optical transmission direction are on the contrary, the beam merging apparatus includes but is not limited to optical circulator, as long as being able to satisfy the transmission route
?.The beam splitting arrangement can separate reference light from work light in a fiber, which includes but unlimited
In optical circulator, as long as being able to satisfy the work.
The structural schematic diagram of light intensity monitor shown in Fig. 3 is please referred to, which includes light intensity detection module
601, fuzzy PID algorithm module 602 and bias control module 603；The fuzzy PID algorithm module 602 respectively with the light
Strong detection module 601 is connected with bias control module 603, and the light intensity detection module 601 is connected with the beam splitting arrangement 20
It connects, the bias control module 603 is connected with the end DC of the intensity modulator 30；The light intensity detection module 601 is used for
The average optical power value of the modulation reference light of measurement；The fuzzy PID algorithm module 602 is used to be joined according to the modulation of measurement
It examines bias control module 603 described in the average optical power value real-time control of light and perturbation is carried out to the voltage at the end DC, to the electricity at the end DC
Pressure is adjusted or the voltage at the end RF is adjusted.
Therefore, the average optical power value for modulating reference light is measured by light intensity detection module 601, fuzzy PID algorithm module 602
Perturbation is carried out to the voltage to the end DC according to the measured value real-time control bias control module 603 of light intensity detection module 601, to DC
The voltage at end is adjusted or the voltage at the end RF is adjusted, obtain modulation reference light average optical power value again by
Light intensity detection module 601 measures, such repeated work.Thus light intensity detection module 601, fuzzy PID algorithm module 602 and partially
Pressure control module 603 further ensure Real-time Feedback adjusting effect, and the structure can in conjunction with software can realize it is a variety of
Regulative mode.
In addition, the light intensity detection module 601 includes photoelectric conversion circuit, I/V conversion circuit and A/D conversion circuit.
The bias control module 603 includes D/A conversion circuit and operational amplification circuit.Specifically, working as light intensity detection module 601
When receiving modulation reference light, modulation reference light converts optical signals into current signal by the photoelectric conversion circuit, the electricity
Stream signal is converted into voltage signal by I/V conversion circuit, and electric signal is transformed into simulation by A/D conversion circuit by voltage signal
It is sent to fuzzy PID algorithm module 602 after signal to be handled, fuzzy PID algorithm module 602 is according to processing result to bias control
Molding block 603 issues control signal；After light intensity detection module 601 receives the control signal, which turns by D/A
It is electric signal that circuit, which is changed, by analog-signal transitions, then amplifies ultra-weak electronic signal by operational amplification circuit.Light-intensity test mould
Circuit in block 601 and bias control module 603 is to utilize circuit with the above function disclosed in the prior art, this
Place is not repeating.Therefore, the real-time stability maintenance system structure of the application is simple, easily manufactures, and practicability is good.
A kind of real-time stability maintenance method of light intensity modulation provided by the embodiments of the present application, the reality applied to above-mentioned any one
Shi Weiwen system.Intensity modulator working principle is as shown in figure 4, from this figure, it can be seen that work as the light intensity of intensity modulator output
When most strong (operating point), the average light power of output is maximum Pm, the corresponding voltage in the end DC is VDC, when needs are to output
Light intensity when being adjusted, according to the strength demand of modulation, in the end the RF on-load voltage V of intensity modulator1, the average light of output
Performance number P1, therefore the luminous intensity exported changes, and realizes the modulation to luminous intensity.
The operating point of intensity modulator can change with the variation of external environment, such as laser decaying, intensity modulated
The variation of temperature locating for device, humidity, pressure etc. can cause the variation of intensity modulator operating point.As shown in figure 5, working as intensity
It is situation before drift that dotted line is corresponding after drifting about to the right, that is, in figure for the operating point of modulator, and it is drift that solid line is corresponding
Situation after shifting, the real work voltage V of the end DC load are no longer that output average light power is maximum PmWhen VDC, at this time
Corresponding actual average optical power is P, it can be seen that after operating point drift, P < Pm, and work as the end RF on-load voltage V1When, output
Actual average optical power value be P1 ′, it can be seen that P1 ′<P1, when the end RF on-load voltage is V1When, intensity modulator output is put down
Equal optical power value is no longer the average optical power value for needing to adjust.Furthermore it can also be seen that when the lesser value of operating point drift, adjusts
The average optical power value rate of change for saving light is faster than average light power maximum rate of change, that is to say, that P1 ′Change rate ratio P
Change rate it is big, therefore, pass through P1 ′Change rate and the change rate of P be known that plots changes.
And when the operating point of intensity modulator to the left drift about after, that is, in figure solid line it is corresponding be drift before feelings
Condition, it is situation after drift that dotted line is corresponding, when the end RF is not loaded with voltage, the actual average optical power of intensity modulator output
Value reduces, as the end RF on-load voltage V1When, the actual average optical power value of intensity modulator output will increase.Same intensity tune
When the lesser value of device operating point drift processed, the average optical power value rate of change for adjusting light changes speed than average light power maximum
Rate is fast.
The real-time stability maintenance method of the application includes: the voltage status that S1 is loaded according to the end RF of IM, controls reference laser diode
Luminance, measurement modulation reference light average optical power value；
S2 makes the modulation work of output according to the voltage at the end DC of the average optical power value of measurement adjusting IM or the voltage at the end RF
The light intensity of light meets system requirements.
From above-mentioned principle it is found that after the operating point drift of intensity modulator, the intensity of modulation work light is no longer system
The intensity needed, by the intensity of the demand of the intensity adjustment of modulation work light to system from figure 5 it can be seen that tune can be passed through
The voltage at the end DC of intensity modulator or the voltage at the end RF are saved, so that the intensity of modulation work light meets system requirements.
Specifically, there are two types of main steps, it is one of are as follows:
S101 is in t1In period, when the voltage that the end RF of IM loads is a kind of voltage, controls the reference laser diode and shine, when
When the voltage of the end the RF load of IM is other voltages, controls the reference laser diode and do not shine, measurement modulation reference light is averaged
Optical power value P1。
S102 is in t2In period, when the voltage that the end RF of IM loads is another voltage, the reference laser diode is controlled
It shines, when the voltage that the end RF of IM loads is other voltages, controls the reference laser diode and do not shine, measurement modulation reference light
Average optical power value P2。
S201 is by P1With P2It is compared, if P1/P2Outside preset threshold range, then adjust the end DC voltage value or
The voltage at the end RF, until the P of feedback1/P2In threshold range；
S202 repeats step S101, S102 and S201, maintains the voltage at the end DC to make P in real time1/P2In threshold range, or
The voltage for adjusting the end RF makes P1/P2In threshold range.
Since the end RF that the reference laser diode of the stability maintenance system of the application only works as IM in a certain period of time loads certain
A kind of pulse of intensity is contained only in the modulation reference light that can just shine, therefore obtain when voltage during this period of time.In addition originally
The stability maintenance that more intensity may be implemented of application, the end the RF voltage no matter loaded within a certain period of time have several, the ginseng of the application
The laser only work when the end RF loads a certain voltage is examined, therefore, the modulation reference light measured during this period of time is averaged
Optical power is able to reflect out the average light power of the corresponding light pulse of modulation work light during this period of time.When the reference of adjusting
Laser luminous intensity is consistent with the operating laser luminous intensity to be, the average light power of the modulation reference light of measurement can
Reflect the intensity of modulation work light single pulse.
Therefore, can according to demand, the luminance of different period setting reference laser diodes is able to reflect out and modulates work
Make the intensity of each light pulse of light；The ratio between the average optical power value of reference light is modulated according to the every two of measurement, it can
Reflect ratio between the corresponding intensity of modulation work light.It therefore can be by adjusting the voltage at the end DC of IM or the electricity at the end RF
Pressure modulates work light pair so that the ratio between the average optical power value of the every two modulation reference light of measurement meets the requirements
The ratio between intensity answered meets the requirements.The application can also be adjusted according to the average optical power value of single modulation reference light
The voltage at the end DC of IM or the voltage at the end RF are adjusted, and keeps reference laser diode luminance, so that the tune measured after adjusting
The average optical power value of reference light processed meets system requirements.
In order to which above-mentioned embodiment, three kinds of intensity stability maintenances and more kinds of intensity stability maintenances and two is more clearly depicted
Intensity stability maintenance embodiment is similar, if adjust IM the voltage at the end DC or the voltage at the end RF make arbitrary two kinds of intensity it
Between average light power ratio meet the requirements.Herein by taking two kinds of intensity stability maintenances as an example:
In t1In period, when the voltage that the end RF of IM loads is VRF1When, it controls the reference laser diode and shines, when the end RF of IM
The voltage of load is VRF2When, it controls the reference laser diode and does not shine, the average optical power value P of measurement modulation reference light1。
Referring to Fig. 6, the reference laser diode of the application is only shining when the end RF of IM loads certain voltage, by IM tune
The modulation reference light obtained after system can preferably reflect the operating point drift situation of IM.The application is with two kinds of modulation conditions
Example, if if reference laser diode is consistent with operating laser luminous situation, the high arteries and veins of a certain moment light intensity after IM is modulated
It rushes the application and is known as high impulse, the low pulse the application of a certain moment light intensity is known as low pulse, as long as guaranteeing high impulse and low arteries and veins
The intensity ratio of punching is in preset threshold value.
In t2In period, when the voltage that the end RF of IM loads is VRF1When, it controls the reference laser diode and does not shine, work as IM
The end RF load voltage be VRF2When, control reference laser diode shines, the average optical power value P of measurement modulation reference light2。
The principle of this step is consistent with S1, is not repeating herein.
By P1With P2It is compared, if P1/P2Outside preset threshold range, then the voltage value at the end DC is adjusted, until feedback
P1/P2In threshold range, the voltage at the end DC is the voltage for exporting average light power maximum at this time.Or the adjustment end RF
Voltage value, until the P of feedback1/P2In threshold range, although the voltage at the end DC is not output average light power maximum at this time
Voltage, as long as but the intensity of light pulse correctly can be realized communication need, therefore the voltage value for adjusting the end RF is also
It is feasible.
In optical communication field, need to keep the intensity ratio of the high impulse and low pulse in modulation work light in preset threshold value
It is interior, therefore reference laser diode is in VRF1When the obtained pulse of modulation reference light it is consistent with the modulation high impulse of work light, with reference to sharp
Light device is in VRF2When obtain modulation reference light pulse with modulate the low pulse of work light it is consistent.Therefore, P1/P2It is also modulation work
Make the high impulse of light and the intensity ratio of low pulse, as long as P1/P2Value can meet communication need in threshold range.
According to P1/P2Value adjust the end DC voltage value when, specific steps are as follows:
Work as VRF1<VRF2When, if P1/P2< threshold value then gradually increases the voltage at the end DC, until P1/P2Equal to threshold value；If P1/P2>
Threshold value then gradually decreases the voltage at the end DC, until P1/P2Equal to threshold value.Since the average optical power value of adjusting changes greatly,
Therefore P1/P2< threshold value, shows P1Compare P2The speed of increase is slow or P1Compare P2Reduced rate is fast, and VRF1<VRF2, therefore show
The operating point of IM moves to right, then needs on this basis to gradually increase the voltage at the end DC, could make P1/P2Value increase.Similarly
P1/P2> threshold value then shows that the operating point of IM20 moves to left, then needs on this basis to gradually decrease the voltage at the end DC.
Work as VRF1>VRF2When, if P1/P2< threshold value then gradually decreases the voltage at the end DC, until P1/P2Equal to threshold value；If P1/
P2> threshold value then gradually increases the voltage at the end DC, until P1/P2Equal to threshold value.The principle of the step and the principle of above-mentioned steps
It is identical, it is not repeating herein.Furthermore VRF1With VRF2Can be according to modulation demand setting, therefore this method is the ratio by relative intensity
Value adjusts the operating point of IM, and the step can accurately judge the operating point drift situation of IM, quickly IM can be made to export
The light intensity of modulation work light meet system requirements, therefore the present processes can be realized efficient, accurate, real-time stability maintenance work
Make.
The application also provides another embodiment, as shown in fig. 7, comprises,
S11 is when the end RF of intensity modulator is not loaded with voltage, i.e. VRF=0V controls the reference laser diode and shines, and setting is strong
The average light power maximum P of modulation reference light is found out in the stepping for spending the end the DC voltage of modulator0And P0The corresponding end DC electricity
Press VDC, V is set by the end DC voltageDC；
S12 is when the end the RF on-load voltage of intensity modulator, i.e. VRF1When, it controls the reference laser diode and does not shine；
S13 carries out perturbation to the voltage at the end DC, successively measures the average optical power value P of the modulation reference lightn, until measurement
PnIn can find out maximum Pm, by PmIt is stored into P0In, by PmCorresponding voltage VmIt is stored into VDCIn, wherein the stepped voltage is
The voltage of identical stepping, 0 < m < n, m, n are positive integer.
After the operating point drift of IM, the real work voltage of the end the DC load in step S12 is no longer output average light
Power is maximum PmWhen voltage.Therefore perturbation, that is, the base in the current end DC operating voltage are carried out to the voltage at the end DC
On plinth gradually plus or minus small voltage, each perturbation measures an average optical power value, until the P of measurementnIn can look for
Maximum P outm.Therefore, the operating point for finding out current IM that this method can be absolute.
DC terminal voltage value is adjusted to the V of step S13 measurement by S14DC；
S15 continues to carry out perturbation to the voltage at the end DC, until the P measured again according to the method for step S13nIn can find out pole
Big value Pm, by PmIt is stored into P0In, by PmCorresponding voltage VmIt is stored into VDCIn, DC terminal voltage value is adjusted to V againDC, so heavy
The multiple step, maintaining the voltage at the end DC in real time is the voltage V for exporting average light power maximumDC。
The step of so repeating the embodiment, maintaining the voltage at the end DC in real time is the voltage for exporting average light power maximum
VDC.The operating point of IM is all to change at the moment, therefore repeat the above steps, and realizes the purpose of real-time stability maintenance.
The present processes step mainly includes three kinds of adjusting methods, the first is according between arbitrary two kinds of intensity
Average light power ratio adjusts the end the RF voltage of IM, and second is according to the average light power ratio between arbitrary two kinds of intensity
The end the DC voltage of IM is adjusted, the third is to carry out perturbation to the end DC voltage, passes through the average light of the modulation reference light of measurement output
Performance number therefrom finds out average light power maximum and corresponding voltage VDC.These three methods can be used alone, can also be with
It is applied in combination, such as adjusts the end RF of IM according to the average light power ratio between arbitrary two kinds of intensity within a certain period of time
When voltage effect is bad, the end the DC electricity that IM is adjusted according to the average light power ratio between arbitrary two kinds of intensity can be switched to
Pressure.
Preferably, as shown in figure 8, it includes: when first time perturbation is in current DC that the voltage to the end DC, which carries out perturbation,
When adding stepped voltage on the basis of the voltage at end, stepping is added in second of perturbation on the basis of the voltage of first time perturbation
Voltage, if P1>P2, then the later perturbation of third time successively subtracts stepped voltage on the basis of first time perturbation, if P1<P2, then
Perturbation later for the third time successively adds stepped voltage on the basis of second of perturbation.As shown in figure 8, by judging P1With P2
Size, it can be determined that the operating point drift variation tendency of IM, being then quickly found out according to the variation tendency keeps IM output average
Voltage when optical power maximum.Therefore, average optical power value of the real-time stability maintenance method of the application according to modulation reference light, energy
Enough realize efficient, accurate, real-time stability maintenance work.
Combine detailed description and exemplary example that the application is described in detail above, but these explanations are simultaneously
It should not be understood as the limitation to the application.It will be appreciated by those skilled in the art that without departing from the application spirit and scope,
A variety of equivalent substitution, modification or improvements can be carried out to technical scheme and embodiments thereof, these each fall within the application
In the range of.The protection scope of the application is determined by the appended claims.
Claims (10)
1. a kind of real-time stability maintenance system of light intensity modulation characterized by comprising operating laser (10), beam splitting arrangement
(20), intensity modulator (30), beam merging apparatus (40), reference laser diode (50) and light intensity monitor (60)；
Operating laser (10) is for issuing work light；
Reference laser diode (50) is for issuing reference light；
Reference light is transmitted to intensity modulator (30) to main optical path by the reference combiner that beam merging apparatus (40) is used to receive
One end, work light are transmitted to intensity modulator (30) other end by beam splitting arrangement (20) after, and with reference to optical propagation direction and
The optical propagation direction that works is opposite；
Intensity modulator (30) is used to be modulated work light, output modulation work light；Or reference light is modulated, it is defeated
Reference light is modulated out；
Beam splitting arrangement (20) is separated from main optical path for that will modulate reference light；
Light intensity monitor (60) be used for receives modulation reference light and according to measurement modulate reference light average optical power value it is real-time
The end the DC voltage or the end RF voltage of feedback regulation intensity modulator (30) make the light intensity of the modulation work light of output meet system
It is required that.
2. the real-time stability maintenance system of light intensity modulation according to claim 1, which is characterized in that when operating laser (10)
When identical as the wavelength of light of reference laser diode (50) transmitting, the beam splitting arrangement (20) and beam merging apparatus (40) are the ring of light
Row device.
3. the real-time stability maintenance system of light intensity modulation according to claim 1, which is characterized in that when operating laser (10)
When not identical as the wavelength of the light of reference laser diode (50) transmitting, the beam splitting arrangement (20) is that optical circulator or dense wavelength division are multiple
With device, the beam merging apparatus (40) is optical circulator or dense wave division multiplexer.
4. the real-time stability maintenance system of light intensity modulation according to claim 1 to 3, which is characterized in that the light
Strong monitor (60) includes light intensity detection module (601), fuzzy PID algorithm module (602) and bias control module (603)；
The fuzzy PID algorithm module (602) respectively with the light intensity detection module (601) and bias control module (603) phase
Connection, the light intensity detection module (601) are connected with the beam splitting arrangement (20), the bias control module (603) and institute
Intensity modulator (30) is stated to be connected；
Average optical power value of the light intensity detection module (601) for the modulation reference light of measurement；
The fuzzy PID algorithm module (602) is used for the average optical power value real-time control institute of the modulation reference light according to measurement
Bias control module (603) is stated to carry out perturbation to the voltage at the end DC, the voltage at the end DC is adjusted or to the voltage at the end RF
It is adjusted.
5. a kind of real-time stability maintenance method of light intensity modulation, applied to the real-time stability maintenance system of claim 1-4 any one,
It is characterized in that, including,
The voltage status that S1 is loaded according to the end RF of intensity modulator controls the luminance of reference laser diode, measurement modulation ginseng
Examine the average optical power value of light；
S2 makes output according to the voltage at the end DC of the average optical power value adjusting strength modulator of measurement or the voltage at the end RF
The light intensity of modulation work light meets system requirements.
6. according to the method described in claim 5, it is characterized in that, step S1 includes,
S101 is in t1In period, when the voltage that the end RF of intensity modulator loads is a kind of voltage, the reference laser diode is controlled
It shines, when the voltage that the end RF of intensity modulator loads is other voltages, controls the reference laser diode and do not shine, measurement is adjusted
The average optical power value P of reference light processed1；
S102 is in t2In period, when the voltage that the end RF of intensity modulator loads is another voltage, the reference laser is controlled
Device shines, and when the voltage that the end RF of intensity modulator loads is other voltages, controls the reference laser diode and does not shine, measures
Modulate the average optical power value P of reference light2。
7. according to the method described in claim 6, it is characterized in that, step S2 includes,
S201 is by P1With P2It is compared, if P1/P2Outside preset threshold range, then the voltage at the end DC of intensity modulator is adjusted
The voltage at value or the end RF, until the P of feedback1/P2In threshold range；
S202 repeats step S101, S102 and S201, maintains the voltage at the end DC to make P in real time1/P2In threshold range, or adjust
The voltage at the section end RF makes P1/P2In threshold range.
8. according to the method described in claim 5, it is characterized in that, step S1 and S2 includes,
S11 controls the reference laser diode and shines, intensity modulator is arranged when the end RF of intensity modulator is not loaded with voltage
The average light power maximum P of modulation reference light is found out in the stepping of the end DC voltage0And P0The corresponding end DC voltage VDC, by DC
End voltage is set as VDC；
S12 controls the reference laser diode and does not shine when the end the RF on-load voltage of intensity modulator；
S13 carries out perturbation to the voltage at the end DC, successively measures the average optical power value P of the modulation reference lightn, until measurement
PnIn can find out maximum Pm, by PmIt is stored into P0In, by PmCorresponding voltage VmIt is stored into VDCIn, wherein the stepped voltage is
The voltage of identical stepping, 0 < m < n, m, n are positive integer.
DC terminal voltage value is adjusted to the V of step S13 measurement by 9.S14DC；
S15 continues to carry out perturbation to the voltage at the end DC, until the P measured again according to the method for step S13nIn can find out greatly
Value Pm, by PmIt is stored into P0In, by PmCorresponding voltage VmIt is stored into VDCIn, DC terminal voltage value is adjusted to V againDC, so repeat
The step, maintaining the voltage at the end DC in real time is the voltage V for exporting average light power maximumDC。
10. according to the method described in claim 8, it is characterized in that, the voltage progress perturbation to the end DC includes:
When first time perturbation is to add stepped voltage on the basis of the voltage at the current end DC, second of perturbation is micro- for the first time
Stepped voltage is added on the basis of the voltage disturbed, if P1>P2, then the later perturbation of third time is on the basis of first time perturbation
Stepped voltage is successively subtracted, if P1<P2, then the later perturbation of third time is on the basis of second of perturbation successively plus stepping electricity
Pressure.
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| CN111290041A (en) * | 2020-03-19 | 2020-06-16 | 之江实验室 | Method and device for suppressing intensity noise of light source by utilizing proportional compensation of electro-optic modulator |
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