CN102333056B - Control the method and system of phase bias point of dual-polarization quadrature phase shift keying modulator - Google Patents
Control the method and system of phase bias point of dual-polarization quadrature phase shift keying modulator Download PDFInfo
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Abstract
The invention discloses a kind of system controlling dual-polarization Quadrature Phase Shift Keying (DP-QPSK) modulator phase bias point, comprising: detection control equipment, for carrying out difference frequency signal detection, when testing result is without difference frequency signal, not operating; When testing result is not without difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator; DP-QPSK modulator, for receiving the adjustment of detection control equipment.The present invention also also discloses a kind of method of control DP-QPSK modulator phase bias point, the various interference in adopting the present invention can avoid detecting and detection inaccurate, thus ensures the stability of DP-QPSK modulator.
Description
Technical field
The present invention relates to the information security field in signal processing technology, particularly relate to a kind of method and system controlling dual-polarization Quadrature Phase Shift Keying (DP-QPSK, Dual Polarization-QPSK) modulator phase bias point.
Background technology
In recent years, along with the raising of optical transmission system speed and the increase of capacity, the transmission rate of optical transmission system was promoted to 40Gbit/s.Speed is in the correlation technique of the optical transmission system of 40Gbit/s, the light phase modulation mode being representative with difference quadrature phase shift keying (DQPSK, Differential Quadrature Phase Shift Keying) is more and more subject to the attention of industry.Symbol rate due to DQPSK only has the half of traditional light amplitude modulation method, and the requirement for optical device is little many; Further, because DQPSK modulation system has superior dispersion tolerance and polarization mode dispersion tolerance limit performance, so DQPSK modulation system is applicable to the optical transmission system of Large Copacity, long distance.
Along with the development of optical transmission system, the speed of optical transmission system of future generation also will rise to 100Gbit/s.Realize the transmission rate of 100Gbit/s, need more efficient optical signal modulations mode, superfast analog-to-digital conversion, and superfast Digital Signal Processing.DP-QPSK modulation system will become the first-selection that transmission rate is the optical transmission system modulation system of 100Gbit/s, basic reason is that DP-QPSK modulation system has larger spectrum utilization ratio than DQPSK modulation system, and DP-QPSK modulation system make use of the impact of phase modulation technique significantly promoting of transmission rate of reply and the dispersion brought, non-linear, polarization mode dispersion (PMD).
DP-QPSK modulator, adopts lithium niobate material to make usually.Due to this properties of materials of lithium niobate, make DP-QPSK modulator all more responsive to the extraneous factor such as temperature and stress, so, make the phase control of DP-QPSK modulator not by the impact of extraneous factor, to the accurate phase control of DP-QPSK modulator, just must pass through peripheral control circuits, produce the phase bias point of direct voltage control DP-QPSK modulator.
At present, the method of control DP-QPSK modulator phase bias point, realized by difference integrated electro detector tube (PD) in the inner two-way polarization state of DP-QPSK modulator, be specially: the pilot signal of the additional different frequency of difference on two phase bias points of DP-QPSK modulator, from two external detection control device detection signal of PD; When detecting difference frequency signal, according to the situation of difference frequency signal, producing direct voltage by detection control equipment and phase bias point is adjusted; When not detecting difference frequency signal, just think that phase bias point has locked onto on normal phase bias point.But, because PD is the device of high integration, often can by the impact of extraneous factor, occur can't detect difference frequency signal or detecting inaccurate situation, this just creates extreme influence to the effect of control DP-QPSK modulator phase bias point.
Visible, the method for the phase bias point of current existing control DP-QPSK modulator, the impact of the factors such as the detection that highly integrated device cannot be avoided to cause is inaccurate, thus reduce the stability of DP-QPSK modulator.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method and system of control DP-QPSK modulator phase bias point, the various interference in detecting and detection inaccurate can be avoided, thus ensure the stability of DP-QPSK modulator.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of system of control DP-QPSK modulator phase bias point, this system comprises: detection control equipment and DP-QPSK modulator; Wherein,
Detection control equipment, for carrying out difference frequency signal detection, when testing result is without difference frequency signal, does not operate; When testing result is not without difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator;
DP-QPSK modulator, for receiving the adjustment of detection control equipment.
In such scheme,
Described detection control equipment, also for generation of pilot signal, sends to DP-QPSK modulator by pilot signal, then receive the light signal after the modulation that DP-QPSK modulator sends, light signal is converted to measured signal;
Accordingly, described DP-QPSK modulator, also for receiving the signal that detection control equipment is sent, sends to detection control equipment by the light signal after modulation.
In such scheme, described detection control equipment, specifically for the duration according to the measured signal received, finds the pilot signal with this measured signal corresponding time slot; Then utilize the pilot signal of corresponding time slot to calculate the error of measured signal, if error is zero, then testing result is without difference frequency signal; If error is non-vanishing, then testing result is the voltage of adjustment phase bias point.
In such scheme,
Described detection control equipment, during specifically for being the voltage promoting phase bias point when testing result, come from which in two phase bias points of DP-QPSK modulator according to this measured signal fixed, direct voltage is promoted the fixing corresponding phase bias point of step value adjustment DP-QPSK modulator; When testing result is reduce the voltage of phase bias point, direct voltage is reduced the fixing corresponding phase bias point of step value adjustment DP-QPSK modulator, then detection control equipment carries out difference frequency signal detection again;
Accordingly, described DP-QPSK modulator, specifically for receiving the adjustment of detection control equipment.
In such scheme, described detection control equipment, comprising: difference frequency signal detection and treatment module and drive circuit module; Wherein,
Difference frequency signal detection and treatment module, for carrying out difference frequency signal detection, when testing result is without difference frequency signal, does not operate; When testing result is not without difference frequency signal, according to testing result, the instruction of adjustment direct voltage is sent to drive circuit module;
Drive circuit module, for receiving the instruction of the adjustment direct voltage that difference frequency signal detection and treatment module is sent, after carrying out the adjustment of direct voltage, is sent to the phase-modulation point of DP-QPSK modulator according to the instruction of adjustment direct voltage by direct voltage.
In such scheme, described detection control equipment, also comprises: spectral module and Photoelectric Detection module; Wherein,
Described spectral module, for receiving the light signal after modulation that DP-QPSK modulator sends, light signal after modulation is divided into two parts, wherein a part sends to Photoelectric Detection module as sensed light signal, and another part mails to as the normal output of DP-QPSK modulator the equipment that DP-QPSK modulator rear end connects;
Accordingly, described Photoelectric Detection module, for receiving the sensed light signal that spectral module is sent, is converted to the signal of telecommunication by sensed light signal, and the gained signal of telecommunication is sent to difference frequency signal detection and treatment module as measured signal;
Described difference frequency signal detection and treatment module, also for receiving the measured signal that Photoelectric Detection module is sent.
Present invention also offers a kind of method of control DP-QPSK modulator phase bias point, the method comprises: detection control equipment carries out difference frequency signal detection, when testing result is without difference frequency signal, does not operate; When testing result is not without difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator.
In such scheme, before described detection control equipment carries out difference frequency signal detection, the method also comprises: detection control equipment produces pilot signal, pilot signal is sent to DP-QPSK modulator; Light signal after the modulation that detection control equipment reception DP-QPSK modulator is sent, is converted to measured signal by light signal.
In such scheme, described detection control equipment carries out difference frequency signal detection, comprising: detection control equipment, according to the duration of the measured signal received, finds the pilot signal with this measured signal corresponding time slot; Then utilize the pilot signal of corresponding time slot to calculate the error of measured signal, if error is zero, then testing result is without difference frequency signal; If error is non-vanishing, then error is non-vanishing, then testing result is the voltage of adjustment phase bias point.
In such scheme, the described phase bias point according to testing result adjustment DP-QPSK modulator, comprise: when testing result is the voltage promoting phase bias point, which in two phase bias points of DP-QPSK modulator detection control equipment come from according to this measured signal fixed, direct voltage promoted the fixing corresponding phase bias point of step value adjustment DP-QPSK modulator; When testing result is reduce the voltage of phase bias point, direct voltage is reduced the fixing corresponding phase bias point of step value adjustment DP-QPSK modulator by detection control equipment, and then detection control equipment carries out difference frequency signal detection again.
The method and system of control DP-QPSK modulator phase bias point provided by the present invention, there is following advantage and disadvantage: at the external detection control equipment of the output of DP-QPSK modulator, the difference frequency signal that modulated light signal carries is gone out by detection control equipment Inspection, according to the testing result of detection control equipment, exchange whole direct voltage to control, the phase bias point of DP-QPSK modulator is controlled; Thus effectively avoid the various interference in detection and uncertainty, the inspection caused as highly integrated device is inaccurate; The present invention has higher reliability and stability.
Accompanying drawing explanation
Fig. 1 is the system composition structural representation of the present invention's control DP-QPSK modulator phase bias point;
Fig. 2 is the composition structural representation of detection control equipment of the present invention;
Fig. 3 is the method flow schematic diagram of the present invention's control DP-QPSK modulator phase bias point.
Embodiment
Basic thought of the present invention is: carry out difference frequency signal detection by external detection control equipment, when testing result is without difference frequency signal, do not operate; When testing result is not without difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator.
Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
As shown in Figure 1, the invention provides a kind of system of control DP-QPSK modulator phase bias point, comprising: detection control equipment 11 and DP-QPSK modulator 12; Wherein,
Detection control equipment 11, for carrying out difference frequency signal detection, when testing result is without difference frequency signal, does not operate; When testing result is not without difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator 12;
DP-QPSK modulator 12, for receiving the adjustment of detection control equipment 11.
Described detection control equipment 11, also for generation of pilot signal, sends to DP-QPSK modulator 12 by pilot signal; Accordingly, described DP-QPSK modulator 12, also for receiving the pilot signal that detection control equipment 11 is sent;
Here, described pilot signal is: low frequency sinusoidal signal by a small margin, such as, can be no more than the 500Hz sinusoidal signal of 125mV for amplitude.
Described detection control equipment 11, after producing pilot signal, chooses two time slots of pilot signal; The pilot signal of a periodic extraction time slot, the pilot signal of this time slot is sent to a phase bias point of DP-QPSK modulator 12, after the duration of one section, interval, the pilot signal of periodic another time slot of extraction, sends to another phase bias point of DP-QPSK modulator 12 by the pilot signal of this time slot; Accordingly, described DP-QPSK modulator 12, specifically for receiving the pilot signal of the different time-gap that detection control equipment 11 is sent respectively on two phase bias points;
Wherein, described periodicity: for being preset in a duration in detection control equipment according to actual conditions; Two time slots of described pilot signal, the principle chosen is preset in detection control equipment according to actual conditions, such as, can arrange the cycle in detection control equipment is T=0.3s, presetting first time slot is TS1=0.01s, and second time slot is TS2=0.015s, and one section of duration of being separated by is 0.1s, then: the pilot signal of first time slot sends rear 0.1s, the pilot signal of second time slot is sent.
Described detection control equipment 11, also for receiving the light signal after modulation that DP-QPSK modulator 12 sends; Accordingly, described DP-QPSK modulator 12, also for the light signal after modulation is sent to detection control equipment 11.
Described detection control equipment 11, also for the light signal after modulation is divided into two parts, wherein a part is as sensed light signal, and another part mails to as the normal output of DP-QPSK modulator 12 equipment that DP-QPSK modulator 12 rear end connects.
Described detection control equipment 11, also for sensed light signal is converted to the signal of telecommunication, carries out difference frequency signal detection using the gained signal of telecommunication as measured signal, if testing result is without difference frequency signal, then and end operation; If testing result is not without difference frequency signal, then according to testing result, phase bias point is adjusted.
Described detection control equipment 11, which specifically for determining that according to the measured signal that receives this measured signal comes from two phase bias points of DP-QPSK modulator 12, then the pilot signal of corresponding time slot is utilized to calculate the error of measured signal, if error is zero, then testing result is without difference frequency signal; If error is non-vanishing, then testing result is the voltage of adjustment phase bias point;
Wherein, the measured signal that described basis receives determine that this measured signal comes from two phase bias points of DP-QPSK modulator 12 which, existing field programmable gate array (FPGAField-Programmable Gate Array) technology can be utilized to realize, do not repeat at this;
The method for calculating difference frequency signal of the error use of described calculating measured signal, is prior art, does not repeat at this.
Described detection control equipment 11, specifically for preset when error is non-vanishing, produce the principle of testing result according to error: can for when error is negative value, testing result is the voltage promoting phase bias point, be be reduce the voltage of phase bias point on the occasion of, testing result when error; Also can for when error be negative value, testing result is reduce the voltage of phase bias point, when error be on the occasion of time, testing result is the voltage of raising phase bias point.
Described detection control equipment 11, during specifically for being the voltage promoting phase bias point when testing result, come from which in two phase bias points of DP-QPSK modulator 12 according to this measured signal fixed, direct voltage is promoted fixing step value and send to the corresponding phase bias point of DP-QPSK modulator 12; When testing result is reduce the voltage of phase bias point, direct voltage is reduced fixing step value and send to the corresponding phase bias point of DP-QPSK modulator 12;
Accordingly, described DP-QPSK modulator 12, specifically for receiving direct voltage that detection control equipment 11 sends to adjust corresponding phase bias point;
Here, described step value is: direct voltage adjusting range value, can be preset in drive circuit module; Also in actual mechanical process, according to circumstances the step value of drive circuit module can be adjusted;
Wherein, the corresponding phase bias point of described adjustment, is prior art, does not repeat at this.
Described detection control equipment 11, can produce two kinds of voltages: a kind of pilot signal of two different time-gaps for periodically exporting, and this pilot signal is alternating voltage, and another kind of is the direct voltage for adjusting.
As shown in Figure 2, described detection control equipment comprises: difference frequency signal detection and treatment module 21 and drive circuit module 22; Wherein,
Difference frequency signal detection and treatment module 21, for carrying out difference frequency signal detection, when testing result is without difference frequency signal, does not operate; When testing result is not without difference frequency signal, according to testing result, the instruction of adjustment direct voltage is sent to drive circuit module 22;
Drive circuit module 22, for receiving the instruction of the adjustment direct voltage that difference frequency signal detection and treatment module 21 is sent, after carrying out the adjustment of direct voltage, is sent to the phase-modulation point of DP-QPSK modulator according to the instruction of adjustment direct voltage by direct voltage.
Described difference frequency signal detection and treatment module 21, also for generation of pilot signal, sends to drive circuit module 22 by pilot signal; Accordingly, described drive circuit module 22, for receiving the pilot signal that difference frequency signal detection and treatment module 21 is sent, is sent to pilot signal on the phase-modulation point of DP-QPSK modulator.
Described drive circuit module 22, specifically for carrying out amplitude limit to pilot signal, such as: can be within the amplitude of pilot signal is limited in 125mV.Described drive circuit module 22, has two, and the output of two drive circuit modules sends to two phase bias points of DP-QPSK modulator respectively.
Described difference frequency signal detection and treatment module 21, specifically for first choosing two time slots of pilot signal; Then periodically extract the pilot signal of a time slot, the pilot signal of this time slot is sent to a drive circuit module 22; After the duration of one section, interval, more periodically extract the pilot signal of another time slot, the pilot signal of this time slot is sent to another one drive circuit module 22; Accordingly, described drive circuit module 22, after also carrying out voltage amplification for the pilot signal of time slot difference frequency signal detection and treatment module 21 periodically sent, is sent to the phase bias point of DP-QPSK modulator.
Described detection control equipment, also comprises: spectral module 23 and Photoelectric Detection module 24; Wherein,
Described spectral module 23, for receiving the light signal after modulation that DP-QPSK modulator sends, light signal after modulation is divided into two parts, wherein a part sends to Photoelectric Detection module 24 as sensed light signal, and another part mails to as the normal output of DP-QPSK modulator the equipment that DP-QPSK modulator rear end connects;
Accordingly, described Photoelectric Detection module 24, for receiving the sensed light signal that spectral module 23 is sent.
Described Photoelectric Detection module 24, can use the low noise PIN detector tube of 10G to realize Photoelectric Detection; Described spectral module 23, point light pipe of 5%/95% can be used to realize, and wherein the light signal of 5% sends to Photoelectric Detection module, and the light signal of other 95% exports as the modulated light signal of DP-QPSK modulator.
Described Photoelectric Detection module 24, also for sensed light signal is converted to the signal of telecommunication, sends to difference frequency signal detection and treatment module 21 using the gained signal of telecommunication as measured signal; Accordingly, described difference frequency signal detection and treatment module 21, also for receiving the measured signal that Photoelectric Detection module 24 is sent.
Described difference frequency signal detection and treatment module 21, specifically for carrying out difference frequency signal detection to measured signal, if testing result is without difference frequency signal, then end operation; If testing result is not without difference frequency signal, then according to testing result, phase bias point is adjusted.
Described difference frequency signal detection and treatment module 21, which specifically for determining that according to the measured signal that receives this measured signal comes from two phase bias points of DP-QPSK modulator, then the pilot signal of corresponding time slot is utilized to calculate the error of measured signal, if error is zero, then testing result is without difference frequency signal; If error signal is negative value, then testing result is the voltage by promoting phase bias point; If error is non-vanishing, then testing result is the voltage of adjustment phase bias point.
Described difference frequency signal detection and treatment module 21, specifically for preset when error is non-vanishing, the principle of testing result is produced: can for when error is negative value according to error, testing result is the voltage promoting phase bias point, be be reduce the voltage of phase bias point on the occasion of, testing result when error; Also can for when error be negative value, testing result is reduce the voltage of phase bias point, when error be on the occasion of time, testing result is the voltage of raising phase bias point.
Described difference frequency signal detection and treatment module 21, during specifically for being the voltage promoting phase bias point when testing result, instruction direct voltage being promoted fixing step value is sent to drive circuit module 22, when testing result is the voltage reducing phase bias point, send instruction direct voltage being reduced fixing step value to drive circuit module 22; Accordingly, described drive circuit module 22, also for receiving the instruction that difference frequency signal detection and treatment module 21 is sent, if instruction is that voltage is promoted fixing step value, then direct voltage promoted fixed step size value, send to DP-QPSK modulator, if instruction is that voltage is reduced fixing step value, then direct voltage is reduced fixed step size value, send to DP-QPSK modulator.
The method of the present invention's control DP-QPSK modulator phase bias point as shown in Figure 3, comprises the following steps:
Step 301: detection control equipment produces pilot signal, pilot signal is sent to DP-QPSK modulator.
Here, described pilot signal is sent to DP-QPSK modulator, comprising: detection control equipment first chooses two time slots of pilot signal; Then the pilot signal of a time slot is periodically extracted, the pilot signal of this time slot is sent to a phase bias point of DP-QPSK modulator, after the duration of one section, interval, the pilot signal of periodic another time slot of extraction, sends to another phase bias point of DP-QPSK modulator by the pilot signal of this time slot.
Light signal after modulation is sent to detection control equipment by step 302:DP-QPSK modulator, and light signal is converted to measured signal by detection control equipment.
Here, the described measured signal that is converted to by light signal is: light signal is first divided into two parts by detection control equipment, wherein a part is as sensed light signal, and another part mails to as the normal output of DP-QPSK modulator the equipment that DP-QPSK modulator rear end connects; Sensed light signal is converted to the signal of telecommunication by detection control equipment again, using the gained signal of telecommunication as measured signal.
Step 303: detection control equipment carries out difference frequency signal detection to measured signal, if testing result is without difference frequency signal, then end process flow process; If testing result is not without difference frequency signal, then perform step 304.
Here, described difference frequency signal is detected as: detection control equipment, according to the duration of the measured signal received, finds the pilot signal with this measured signal corresponding time slot, and this measured signal comes from two phase bias points of DP-QPSK modulator which is determined; Then utilize the pilot signal of corresponding time slot to calculate the error of measured signal, if error is zero, then testing result is without difference frequency signal; If error is non-vanishing, then testing result is the voltage of adjustment phase bias point;
Wherein, if described error is non-vanishing, then testing result is the voltage of adjustment phase bias point, be specially: when error is non-vanishing, the preset principle producing testing result according to error is used to obtain final detection result, can for when error be negative value, testing result is the voltage of lifting phase bias point, be be reduce the voltage of phase bias point on the occasion of, testing result when error; Also can for when error be negative value, testing result is reduce the voltage of phase bias point, when error be on the occasion of time, testing result is the voltage of raising phase bias point.
Step 304: detection control equipment adjusts to phase bias point according to testing result, then returns step 301;
This step is specially: when testing result is the voltage promoting phase bias point, which in two phase bias points of DP-QPSK modulator detection control equipment come from according to this measured signal fixed, direct voltage promoted the fixing corresponding phase bias point of step value adjustment DP-QPSK modulator; When testing result is reduce the voltage of phase bias point, direct voltage is reduced the fixing corresponding phase bias point of step value adjustment DP-QPSK modulator by detection control equipment, then returns step 301.
Visible, pass through said method, by original by the detection mode from the external checkout equipment of PD, change at the external detection control equipment of the output of DP-QPSK modulator, the difference frequency signal that modulated light signal carries is gone out by detection control equipment Inspection, thus, effectively avoid the various interference in detecting and uncertainty, there is higher reliability and stability.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (8)
1. control a system for dual-polarization Quadrature Phase Shift Keying DP-QPSK modulator phase bias point, it is characterized in that, this system comprises: detection control equipment and DP-QPSK modulator, the external described detection control equipment of output of described DP-QPSK modulator; Wherein,
Detection control equipment, after pilot signal, chooses two time slots of pilot signal; The pilot signal of a periodic extraction time slot, the pilot signal of this time slot is sent to a phase bias point of DP-QPSK modulator, after the duration of one section, interval, the pilot signal of periodic another time slot of extraction, sends to another phase bias point of DP-QPSK modulator by the pilot signal of this time slot; And for receiving the light signal after modulation that DP-QPSK modulator sends, light signal being converted to measured signal and being used for carrying out difference frequency signal detection, when testing result is without difference frequency signal, not operating; When testing result is not without difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator;
DP-QPSK modulator, for receiving the pilot signal of the different time-gap that detection control equipment is sent, sends to detection control equipment by the light signal after modulation; Also for receiving the adjustment of detection control equipment.
2. system according to claim 1, is characterized in that,
Described detection control equipment, specifically for the duration according to the measured signal received, finds the pilot signal with this measured signal corresponding time slot; Then utilize the pilot signal of corresponding time slot to calculate the error of measured signal, if error is zero, then testing result is without difference frequency signal; If error is non-vanishing, then testing result is the voltage of adjustment phase bias point.
3. system according to claim 2, is characterized in that,
Described detection control equipment, during specifically for being the voltage promoting phase bias point when testing result, come from which in two phase bias points of DP-QPSK modulator according to this measured signal fixed, direct voltage is promoted the fixing corresponding phase bias point of step value adjustment DP-QPSK modulator; When testing result is reduce the voltage of phase bias point, direct voltage is reduced the fixing corresponding phase bias point of step value adjustment DP-QPSK modulator, then detection control equipment carries out difference frequency signal detection again;
Accordingly, described DP-QPSK modulator, specifically for receiving the adjustment of detection control equipment.
4. system according to claim 3, is characterized in that, described detection control equipment, comprising: difference frequency signal detection and treatment module and drive circuit module; Wherein,
Difference frequency signal detection and treatment module, for carrying out difference frequency signal detection, when testing result is without difference frequency signal, does not operate; When testing result is not without difference frequency signal, according to testing result, the instruction of adjustment direct voltage is sent to drive circuit module;
Drive circuit module, for receiving the instruction of the adjustment direct voltage that difference frequency signal detection and treatment module is sent, after carrying out the adjustment of direct voltage, is sent to the phase-modulation point of DP-QPSK modulator according to the instruction of adjustment direct voltage by direct voltage.
5. system according to claim 4, is characterized in that, described detection control equipment, also comprises: spectral module and Photoelectric Detection module; Wherein,
Described spectral module, for receiving the light signal after modulation that DP-QPSK modulator sends, light signal after modulation is divided into two parts, wherein a part sends to Photoelectric Detection module as sensed light signal, and another part mails to as the normal output of DP-QPSK modulator the equipment that DP-QPSK modulator rear end connects;
Accordingly, described Photoelectric Detection module, for receiving the sensed light signal that spectral module is sent, is converted to the signal of telecommunication by sensed light signal, and the gained signal of telecommunication is sent to difference frequency signal detection and treatment module as measured signal;
Described difference frequency signal detection and treatment module, also for receiving the measured signal that Photoelectric Detection module is sent.
6. a method for control DP-QPSK modulator phase bias point, it is characterized in that, the method comprises: after the detection control equipment external with the output of DP-QPSK modulator produces pilot signal, chooses two time slots of pilot signal; The pilot signal of a periodic extraction time slot, the pilot signal of this time slot is sent to a phase bias point of DP-QPSK modulator, after the duration of one section, interval, the pilot signal of periodic another time slot of extraction, sends to another phase bias point of DP-QPSK modulator by the pilot signal of this time slot; And for receive that DP-QPSK modulator sends the pilot signal of different time-gap is modulated after light signal, light signal is converted to measured signal and is used for carrying out difference frequency signal detection, when testing result is without difference frequency signal, do not operate; When testing result is not without difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator.
7. method according to claim 6, is characterized in that, described detection control equipment carries out difference frequency signal detection, comprising: detection control equipment, according to the duration of the measured signal received, finds the pilot signal with this measured signal corresponding time slot; Then utilize the pilot signal of corresponding time slot to calculate the error of measured signal, if error is zero, then testing result is without difference frequency signal; If error is non-vanishing, then error is non-vanishing, then testing result is the voltage of adjustment phase bias point.
8. method according to claim 6, it is characterized in that, the described phase bias point according to testing result adjustment DP-QPSK modulator, comprise: when testing result is the voltage promoting phase bias point, which in two phase bias points of DP-QPSK modulator detection control equipment come from according to this measured signal fixed, direct voltage promoted the fixing corresponding phase bias point of step value adjustment DP-QPSK modulator; When testing result is reduce the voltage of phase bias point, direct voltage is reduced the fixing corresponding phase bias point of step value adjustment DP-QPSK modulator by detection control equipment, and then detection control equipment carries out difference frequency signal detection again.
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| CN101043269A (en) * | 2006-03-22 | 2007-09-26 | 富士通株式会社 | I-Q quadrature modulation transmitter and its device and method for monitoring I-Q phase deviation |
| CN101354515A (en) * | 2008-09-05 | 2009-01-28 | 中兴通讯股份有限公司 | Method and device for control bias of laser modulator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106936746A (en) * | 2015-12-31 | 2017-07-07 | 海思光电子有限公司 | The locking means and device of a kind of phase bias point of DP-QPSK modulators |
| CN106936746B (en) * | 2015-12-31 | 2020-01-31 | 海思光电子有限公司 | method and device for locking phase bias point of DP-QPSK modulator |
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| CN102333056A (en) | 2012-01-25 |
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