CN102723998B - Control device and control method of delay interferometer working point - Google Patents
Control device and control method of delay interferometer working point Download PDFInfo
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- CN102723998B CN102723998B CN201210170530.1A CN201210170530A CN102723998B CN 102723998 B CN102723998 B CN 102723998B CN 201210170530 A CN201210170530 A CN 201210170530A CN 102723998 B CN102723998 B CN 102723998B
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Abstract
The invention discloses a control device of a delay interferometer working point. The device comprises a telecommunications industry association (TIA) circuit, a filter amplifier circuit, an error signal comparison circuit, an integral circuit and a drive amplifier circuit which are sequentially connected, wherein the output end of the drive amplifier circuit is connected with a heating resistor of a delay interferometer; the control device also comprises an adjustable direct current voltage circuit and a low frequency signal generation circuit; the adjustable direct current voltage circuit is connected with the output end of the integral circuit; and two output ends of the low frequency signal generation circuit are respectively connected with the output end of the integral circuit and the error signal comparison circuit. By adopting the control device, the delay interferometer working point is drifted to ensure that a transmitted signal has an error because the wavelength is changed or the optical power is fluctuated and the ambient temperature is changed, so that the feedback control over the delay interferometer working point is realized.
Description
Technical field
The present invention, about a kind of control device of time delay interferometer working point and control method thereof, refers to that a kind of light signal self adaptation of reception that can make controls control device in the time delay interferometer working point of Best Point and control method thereof in real time especially.
Background technology
In the transmission system of the long distance of the high speed of fiber optic communication field, traditional intensity modulated technology is adopted to be difficult to reach requirement.Generally phase modulation technique is have employed in current long distance transmission, Mach once moral external modulation technology has generally been used at transmitting terminal, and adopt time delay interferometer (DLI) at receiving terminal, by the interference of light, the phase information of light is changed into strength information, complete the phase demodulating of light.For current phase delay interferometer, major part is all by regulating inner Heater(heating resistor) carry out the change of control temperature, impel the alignment of time delay interferometer light center frequency.But, because the wavelength and power that receive light all can exist the change of fluctuation, and directly affect the demodulation performance of time delay interferometer.Equally, device is in running, and the change of ambient temperature also can cause slowly departing from of light center frequency, thus makes the desired control point of time delay interferometer produce drift from preset points.When occurring seriously to drift about, the light signal received even cannot recover original strength information, so must realize the stability contorting of interferometer working point.It is comparatively slow that prior art finds time delay interferometer working point speed, and need external system to provide feedback information to control working point, and design is complicated.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of change preventing from receiving optical wavelength and power, and the impact of ambient temperature causes control device and the control method thereof of the time delay interferometer working point of time delay interferometer Point Drifting.
For achieving the above object, the invention provides a kind of control device of time delay interferometer working point, it comprises the TIA(trans-impedance amplifier connected successively) circuit, filter amplification circuit, error signal comparison circuit, integrating circuit and drive amplification circuit, this drive amplification circuit output end connects the heating resistor of time delay interferometer, this control device also includes adjustable dc voltage circuit and low frequency signal circuit for generating, this adjustable dc voltage circuit connects the output of this integrating circuit, two outputs of this low frequency signal circuit for generating connect this integrating circuit output and this error signal comparison circuit respectively, wherein this TIA circuit is by balanced detector high speed PD(photodiode) export photogenerated current and change into voltage signal, this filter amplification circuit detects low frequency signal f composition and amplifies, the phase information of this error signal comparison circuit detection of error signals, and output phase error signal, integrating circuit carries out integral adjustment to the error signal of phase place, this adjustable dc voltage circuit is direct voltage adjustable circuit, regulates the voltage power supply scope of the heating resistor of time delay interferometer, the effect of this low frequency signal circuit for generating is to low frequency signal amplitude adjusted, this drive amplification circuit is the heating resistor driving time delay interferometer with current signal.
Described filter amplification circuit mainly includes the passive low ventilating filter connected successively, ratio transport and placing device, band pass filter, active low-pass filter, light signal is changed into current signal by described balanced detector high speed PD, this signal contains the low frequency signal f composition from the input of time delay interferometer heating resistor port, current signal converts to by described TIA circuit can process voltage signal, pass through this passive low ventilating filter filtering radio-frequency component again, through this ratio transport and placing device, the amplification of this signal is carried out filtering process again by this band pass filter, the noise section of filtering high and low frequency, described low frequency signal f is obtained again through this active low-pass filter.
Described error signal comparison circuit comprises inverter and phase error comparator, the output of this inverter connects the input of this phase error comparator, the input of this inverter also directly connects another input of this phase error comparator simultaneously, described low frequency signal f is input to this phase error comparator after this inverter is anti-phase, this low frequency signal f is also directly inputted to this phase error comparator simultaneously, the low-frequency square-wave signal that described low frequency signal circuit for generating produces controls the capacitance switch of this phase error comparator, control positive to export or anti-phase output, this phase error comparator output phase error signal.
This control device also includes reset circuit and supervisory circuit, described integrating circuit and this reset circuit are connected in parallel, the output of described integrating circuit connects this reset circuit by this supervisory circuit, this reset circuit completes and resets reset to the heating resistor operating voltage pin of time delay interferometer, this supervisory circuit mainly monitors the output voltage of integrating circuit, exceed its operating voltage range, complete reset.
Described reset circuit is made up of the window comparator be connected and analog switch chip, wherein an input of this analog switch chip connects the input of described integrating circuit, the output of this analog switch chip connects the output of described integrating circuit, and this supervisory circuit connects the input of this window comparator.
This control device also includes adjustable dc voltage circuit, and this adjustable dc voltage circuit connects the output of described integrating circuit, and this adjustable dc voltage circuit is direct voltage adjustable circuit, regulates the voltage power supply scope of the heating resistor of time delay interferometer.
Described low frequency signal circuit for generating is made up of the single-chip microcomputer be connected and digital regulation resistance, and this single-chip microcomputer produces low-frequency square-wave signal, and adjustable side's wave frequency; This digital regulation resistance can regulate the amplitude of square-wave signal.
The present invention also provides a kind of control method of time delay interferometer working point, and the method comprises:
(1) light signal of time delay interferometer receiving phase modulation, produces by low frequency signal circuit for generating the control pin that a low-frequency square-wave signal is input to the heating resistor of time delay interferometer;
(2) utilize balanced detector high speed PD that light signal is converted to photo-signal, contain the required low frequency signal controlled in this photo-signal, also comprise high-frequency signal part;
(3) photoelectric current that balanced detector high speed PD exports changes into the voltage signal of amplification through TIA circuit, this voltage signal includes the composition that the required low frequency part controlled also has high-frequency noise and direct current;
(4) voltage signal of this amplification after filtering amplifying circuit leach low frequency signal and carry out comparing of phase place with the former low frequency signal f being input to time delay interferometer, obtain a phase error signal by error phase comparison circuit;
(5) integrating circuit regulates this phase error signal until export the best effort point voltage that a stable DC signal is exactly this time delay interferometer;
(6) be drive amplification circuit at integral adjustment rear stage, in order to ensure the voltage power supply scope of the heating resistor of time delay interferometer.
Described method also comprises FEEDBACK CONTROL step, described integrating circuit is connected in parallel a reset circuit, the output of described integrating circuit connects this reset circuit by a supervisory circuit, this reset circuit is made up of the window comparator be connected and analog switch chip, wherein an input of this analog switch chip connects the input of described integrating circuit, the output of this analog switch chip connects the output of described integrating circuit, this supervisory circuit connects the input of this window comparator, at the output of integrating circuit, supervisory circuit is sampled to it and is input in window comparator, the threshold value of setting window comparator, when output voltage exceedes threshold value, window comparator exports a switching signal to the control pin of analog switch chip, analog switch chip exports a zero level signal and makes its replacement of making zero to the output of integrating circuit, now from 0 level again integration until find best operating point.
The invention solves the working point causing time delay interferometer due to the change of wavelength or the fluctuation of luminous power and variation of ambient temperature drift occurs and makes the signal of transmission produce mistake, achieve the FEEDBACK CONTROL to time delay interferometer working point.Control device simple circuit of the present invention, adopt analog circuit to control, response speed is exceedingly fast, and is better than luminous power controlling of sampling scheme, need not error code information feedback control, controls in real time at Best Point for the light signal self adaptation received, and application is convenient.
Accompanying drawing explanation
Fig. 1 is control device embodiment one structured flowchart of time delay interferometer working point of the present invention;
Fig. 2 is control device embodiment two structured flowchart of time delay interferometer working point of the present invention;
Fig. 3 (a) and Fig. 3 (b) are respectively time delay interferometer best operating point and disappear mutually mouth, mutually long mouth light eye pattern;
Fig. 4 is the structured flowchart of filter amplification circuit in the present invention;
Fig. 5 is the structured flowchart of medial error signal comparator circuit of the present invention;
Fig. 6 is detection signal after filter and amplification and its inversion signal and output phase error signal graph;
Fig. 7 is the theory diagram of integrating circuit, reset circuit and supervisory circuit in control device of the present invention;
Fig. 8 is the structured flowchart of medium and low frequency signal generating circuit of the present invention.
Embodiment
For ease of having further understanding to structure of the present invention, method and the effect that reaches, the existing preferred embodiment that develops simultaneously by reference to the accompanying drawings is described in detail as follows.
The present invention to the working point control of time delay interferometer at Best Point to carry out the demodulation of light phase, a low-frequency square-wave disturbing signal is added on the Heater voltage control input pin of interferometer, owing to superposing a disturbing signal, the temperature of Heater has a faint fluctuation, this fluctuation can be directly reflected in light data-signal at a high speed and go, again by the PD(Photo-Diode of balanced detector, photodiode) demodulation is carried out to light signal, this restituted signal is through detection, filter and amplification, signal errors compares, integral adjustment, drive amplification exports DC control signal and finds time delay interferometer working point in real time.As shown in Figure 1, time delay interferometer working point control device of the present invention comprises the TIA(trans-impedance amplifier connected successively) circuit 10, filter amplification circuit 20, error signal comparison circuit 30, integrating circuit 40 and drive amplification circuit 80, drive amplification circuit 80 output connects the Heater of time delay interferometer, and this control device also includes low frequency signal circuit for generating 70, and two outputs of this low frequency signal circuit for generating 70 connect integrating circuit 40 output and error signal comparison circuit 30 respectively.As shown in Figure 2, control device of the present invention also includes reset circuit 60, supervisory circuit 90 and adjustable dc voltage circuit 50, this integrating circuit 40 is in parallel with reset circuit 60, the output of integrating circuit 40 connects reset circuit 60 by supervisory circuit 90, and this adjustable dc voltage circuit 50 connects integrating circuit 40 output.
Wherein balanced detector high speed PD is mainly exported photogenerated current and changes into voltage signal by TIA circuit 10; Filter amplification circuit 20 mainly detects low frequency signal f composition and amplifies; The phase information of error signal comparison circuit 30 detection of error signals; Integrating circuit 40 carries out integral adjustment to the error signal of phase place; Adjustable dc voltage circuit 50: it is direct voltage adjustable circuit, regulates Heater voltage power supply scope; Reset circuit 60 completes and resets reset to Heater operating voltage pin; The effect of low frequency signal circuit for generating 70 is to low frequency signal amplitude adjusted; Drive amplification circuit 80: because Heater is heating resistor type, must drive with current signal; Supervisory circuit 90: mainly monitor the output voltage of integrating circuit 40, exceedes its operating voltage range, completes reset.
In the present invention, filter amplification circuit 20 mainly includes the passive low ventilating filter 201, ratio transport and placing device 202, band pass filter 203, the active low-pass filter 204 that connect successively.As shown in Figure 4.Wherein passive low ventilating filter 201 adopts RC circuit, according to filtering wave frequency, designs suitable RC value; Ratio transport and placing device 202 is by suitable resistance, amplifier proportion of composing amplifying circuit; Band pass filter 203 forms bandwidth-limited circuit by suitable resistance, electric capacity, amplifier; Active low-pass filter 204 forms low-pass filter circuit by suitable resistance, electric capacity, amplifier.
The specific works mode of filter amplification circuit 20 is: light signal is changed into current signal by balanced detector high speed PD, this signal contains the low frequency signal f composition from the input of time delay interferometer Heater port, current signal converts to by TIA circuit 10 can process voltage signal, again through RC passive low ventilating filter 201 filtering radio-frequency component, in order to obtain comparatively clean low frequency signal, through ratio transport and placing device 202, the amplification of this signal is carried out filtering process again by band pass filter 203, the noise section of filtering high and low frequency, calculate suitable gain amplifier, amplifying signal can not exceed amplifier saturation value, finally obtain low frequency signal f through one-level active low-pass filter 204 again.
Error signal comparison circuit 30 in the present invention comprises inverter 301 and phase error comparator 302.As shown in Figure 5, the output of this inverter 301 connects the input of phase error comparator 302, and the input of inverter 301 also directly connects another input of phase error comparator simultaneously.Wherein the suitable inverter chip of bandwidth frequency directly chosen by inverter 301; Phase error comparator 302 uses switching capacity chip design.
The specific works mode of the error signal comparison circuit 30 in the present invention: amplifying later signal is after filtering a clean low frequency signal f, in order to obtain the information of phase difference between low frequency signal that this low frequency signal f and low frequency signal circuit for generating 70 produce, this low frequency signal f is input to phase error comparator 302 after inverter 301 is anti-phase, this low frequency signal f is directly inputted to phase error comparator 302 simultaneously, the capacitance switch of the low-frequency square-wave signal control phase error comparator 302 of now low frequency signal circuit for generating 70 generation, control positive to export or anti-phase output.As shown in Figure 6, oscilloscope reflects the contrary two paths of signals of phase place and is input in phase error comparator 302, and bottom is that the error signal of phase place exports.
As shown in Figure 7, the theory diagram of the integrating circuit in the present invention, reset circuit, supervisory circuit and adjustable dc voltage circuit, completes the output of control voltage.Wherein integrating circuit 40: choose suitable amplifier, electric capacity composition integrating circuit; Adjustable dc voltage circuit 50: potentiometer regulates the size of direct voltage; Reset circuit 60 is made up of with analog switch chip 602 window comparator 601 be connected, wherein an input of analog switch chip 602 connects the input of integrating circuit 401, the output of analog switch chip 602 connects the output of integrating circuit 40, and supervisory circuit 90 connects the input of window comparator 601.Supervisory circuit 90: select suitable sample resistance, amplifier to form supervisory circuit.
The specific works flow process of foregoing circuit in the present invention: by phase error comparator 302 output phase error signal, this phase error signal changes along with time delay interferometer Heater change in voltage, when this phase error signal is input in integrating circuit 40, the output of integrating circuit 40 is all the time towards certain Long-term change trend until time delay interferometer is in best operating point, when now the input signal convergence of integrating circuit 40 is 0, the output of corresponding integrating circuit 40 is a galvanic current pressure and time delay interferometer best operating point.Because the operating state of time delay interferometer changes with environmental change, its working point Heater control voltage is also along with change, but there is saturated restriction by the output voltage of integrating circuit 40, when reach capacity magnitude of voltage time just remain unchanged, integrating circuit 40 may prior to the work of time delay interferometer in addition, now balanced detector high speed PD does not have signal output, integrating circuit 40 can be integrated to its saturation voltage and no longer change, so devise reset circuit 60, first at the output of integrating circuit 40, supervisory circuit 90 is sampled to it and is input in window comparator 601, the threshold value of setting window comparator 601, when output voltage exceedes threshold value, window comparator 601 exports a switching signal to the control pin of analog switch chip 602, analog switch chip 602 exports a zero level signal and makes its replacement of making zero to the output of integrating circuit 40, now from 0 level again integration until find best operating point, in order to ensure the Heater safe voltage working range of time delay interferometer, the direct current biasing of certain limit will be carried out to integral output voltage, this maximum power can will born according to Heater calculates.
As shown in Figure 8, the low frequency signal circuit for generating 70 in the present invention is made up of single-chip microcomputer 702 and digital regulation resistance 701, and single-chip microcomputer 702 produces low-frequency square-wave signal, can the side's of adjustment wave frequency according to circuit design; Digital regulation resistance 701 can regulate the amplitude of square-wave signal.In the present invention, square-wave signal be there are certain requirements: (1) can not be too little for the size of dither signal amplitude, ensures that it can detect through PD, can not conference affect Heater temperature and fluctuate up and down very much, cause working point unstable; (2) frequency of low frequency signal will ensure very little, makes time delay interferometer have the abundant thermo-optical response time.
Utilize the method for control device of the present invention to time delay interferometer working point control as described below:
(1) light signal of time delay interferometer receiving phase modulation, to in the short period, search out working point and complete FEEDBACK CONTROL, the searching of time delay interferometer working point produces by low frequency signal circuit for generating 70 the Heater control pin that a low-frequency square-wave signal is input to time delay interferometer, when time delay interferometer is in best operating point, corresponding interference delivery outlet luminous power is in extreme value.As shown in Figure 3.
(2) envelope can reflect the drift condition of time delay interferometer light center frequency in real time at the low frequency signal of light data-signal, this control system is exactly will carry out to this low frequency signal the object that FEEDBACK CONTROL reaches stable operating point, balanced detector high speed PD detects photo-signal, contain the required low frequency signal controlled in this photo-signal, also comprise high-frequency signal part;
(3) balanced detector high speed PD photoelectric current out changes into the voltage signal of amplification through TIA circuit 10, this voltage signal includes the composition that the required low frequency part controlled also has high-frequency noise and direct current, so first require the composition shelving direct current, leach required low frequency part;
(4) voltage signal of this amplification after filtering amplifying circuit 20 leach low frequency signal and carry out comparing of phase place with the former low frequency signal f being input to time delay interferometer, obtain a phase error signal by error phase comparison circuit 30;
(5) integrating circuit 40 regulates this phase error signal until export the best effort point voltage that a stable DC signal is exactly this time delay interferometer.
(6) be drive amplification circuit 80 at integral adjustment rear stage, ensure Heater voltage power supply scope.
The control device of time delay interferometer working point is stablized in the present invention, that optical power monitoring is carried out to two interference delivery outlets of interferometer, set the control voltage of interferometer by the extreme point finding luminous power, then regulated the working point of interferometer by the error code information of system feedback in real time.The invention solves the working point causing time delay interferometer due to the change of wavelength or the fluctuation of luminous power and variation of ambient temperature drift occurs and makes the signal of transmission produce mistake, achieve the FEEDBACK CONTROL to time delay interferometer working point.
Control device of the present invention may be used for the searching of phase delay interferometer working point, comprise and be positioned at interference and disappear mutually the control of mouth and mutually long mouth maximum point and smallest point, whole device adopts hardware circuit to control, FEEDBACK CONTROL can be carried out timely and effectively to the signal in light path, the control to time delay interferometer working point just can be completed while powering on, and keep when environmental change light signal relative phase constant, reach the object of stability contorting.Control device simple circuit of the present invention, adopt analog circuit to control, response speed is exceedingly fast, and is better than luminous power controlling of sampling scheme, need not error code information feedback control, controls in real time at Best Point for the light signal self adaptation received, and application is convenient.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (9)
1. the control device of a time delay interferometer working point, it is characterized in that, it comprises the trans-impedance amplifier circuit connected successively, filter amplification circuit, error signal comparison circuit, integrating circuit and drive amplification circuit, this drive amplification circuit output end connects the heating resistor of time delay interferometer, this control device also includes low frequency signal circuit for generating, two outputs of this low frequency signal circuit for generating connect this integrating circuit output and this error signal comparison circuit respectively, wherein this trans-impedance amplifier circuit balanced detector high-speed photodiode is exported photogenerated current change into voltage signal, this filter amplification circuit detects low frequency signal f composition and amplifies, the phase information of this error signal comparison circuit detection of error signals, and output phase error signal, integrating circuit carries out integral adjustment to the error signal of phase place, the effect of this low frequency signal circuit for generating is to low frequency signal amplitude adjusted, this drive amplification circuit is the heating resistor driving time delay interferometer with current signal,
Described control device also includes adjustable dc voltage circuit, and this adjustable dc voltage circuit is direct voltage adjustable circuit, regulates the voltage power supply scope of the heating resistor of time delay interferometer.
2. the control device of time delay interferometer working point as claimed in claim 1, it is characterized in that, described filter amplification circuit mainly includes the passive low ventilating filter connected successively, ratio transport and placing device, band pass filter, active low-pass filter, light signal is changed into current signal by described balanced detector high-speed photodiode, this signal contains the low frequency signal f composition from the input of time delay interferometer heating resistor port, current signal converts to by described trans-impedance amplifier circuit can process voltage signal, pass through this passive low ventilating filter filtering radio-frequency component again, through this ratio transport and placing device, the amplification of this signal is carried out filtering process again by this band pass filter, the noise section of filtering high and low frequency, described low frequency signal f is obtained again through this active low-pass filter.
3. the control device of time delay interferometer working point as claimed in claim 1, it is characterized in that, described error signal comparison circuit comprises inverter and phase error comparator, the output of this inverter connects the input of this phase error comparator, the input of this inverter also directly connects another input of this phase error comparator simultaneously, described low frequency signal f is input to this phase error comparator after this inverter is anti-phase, this low frequency signal f is also directly inputted to this phase error comparator simultaneously, the low-frequency square-wave signal that described low frequency signal circuit for generating produces controls the capacitance switch of this phase error comparator, control positive to export or anti-phase output, this phase error comparator output phase error signal.
4. the control device of time delay interferometer working point as claimed in claim 1, it is characterized in that, this control device also includes reset circuit and supervisory circuit, described integrating circuit and this reset circuit are connected in parallel, the output of described integrating circuit connects this reset circuit by this supervisory circuit, this reset circuit completes and resets reset to the heating resistor operating voltage pin of time delay interferometer, this supervisory circuit mainly monitors the output voltage of integrating circuit, exceed its operating voltage range, complete reset.
5. the control device of time delay interferometer working point as claimed in claim 4, it is characterized in that, described reset circuit is made up of the window comparator be connected and analog switch chip, wherein an input of this analog switch chip connects the input of described integrating circuit, the output of this analog switch chip connects the output of described integrating circuit, and this supervisory circuit connects the input of this window comparator.
6. the control device of time delay interferometer working point as claimed in claim 4, is characterized in that described adjustable dc voltage circuit connects the output of described integrating circuit.
7. the control device of time delay interferometer working point as claimed in claim 1, it is characterized in that, described low frequency signal circuit for generating is made up of the single-chip microcomputer be connected and digital regulation resistance, and this single-chip microcomputer produces low-frequency square-wave signal, and adjustable side's wave frequency; This digital regulation resistance can regulate the amplitude of square-wave signal.
8. a control method for time delay interferometer working point, is characterized in that, the method comprises:
(1) light signal of time delay interferometer receiving phase modulation, produces by low frequency signal circuit for generating the control pin that a low-frequency square-wave signal is input to the heating resistor of time delay interferometer;
(2) utilize balanced detector high-speed photodiode that light signal is converted to photo-signal, contain the required low frequency signal controlled in this photo-signal, also comprise high-frequency signal part;
(3) photoelectric current that balanced detector high-speed photodiode exports changes into the voltage signal of amplification through trans-impedance amplifier circuit, this voltage signal includes the composition that the required low frequency part controlled also has high-frequency noise and direct current;
(4) voltage signal of this amplification after filtering amplifying circuit leach low frequency signal and carry out comparing of phase place with the former low frequency signal f being input to time delay interferometer, obtain a phase error signal by error phase comparison circuit;
(5) integrating circuit regulates this phase error signal until export the best effort point voltage that a stable DC signal is exactly this time delay interferometer;
(6) be drive amplification circuit at integral adjustment rear stage, in order to ensure the voltage power supply scope of the heating resistor of time delay interferometer.
9. the control method of time delay interferometer working point as claimed in claim 8, it is characterized in that, described method also comprises FEEDBACK CONTROL step, described integrating circuit is connected in parallel a reset circuit, the output of described integrating circuit connects this reset circuit by a supervisory circuit, this reset circuit is made up of the window comparator be connected and analog switch chip, wherein an input of this analog switch chip connects the input of described integrating circuit, the output of this analog switch chip connects the output of described integrating circuit, this supervisory circuit connects the input of this window comparator, at the output of integrating circuit, supervisory circuit is sampled to it and is input in window comparator, the threshold value of setting window comparator, when output voltage exceedes threshold value, window comparator exports a switching signal to the control pin of analog switch chip, analog switch chip exports a zero level signal and makes its replacement of making zero to the output of integrating circuit, now from 0 level again integration until find best operating point.
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| CN112152722A (en) * | 2019-06-26 | 2020-12-29 | 青岛海信宽带多媒体技术有限公司 | Optical module |
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