CN102333056A - Method and system for controlling phase bias point of dual-polarization quadrature phase shift keying modulator - Google Patents
Method and system for controlling phase bias point of dual-polarization quadrature phase shift keying modulator Download PDFInfo
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- CN102333056A CN102333056A CN201110299925A CN201110299925A CN102333056A CN 102333056 A CN102333056 A CN 102333056A CN 201110299925 A CN201110299925 A CN 201110299925A CN 201110299925 A CN201110299925 A CN 201110299925A CN 102333056 A CN102333056 A CN 102333056A
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Abstract
The invention discloses a system for controlling a phase bias point of a dual-polarization quadrature phase shift keying (DP-QPSK) modulator. The system comprises detection control equipment and a DP-QPSK modulator, wherein the detection control equipment is used for performing difference frequency signal detection, when the detection result is a difference frequency signal, no operation is performed, and when the detection result is not the difference frequency signal, the phase bias point of the DP-QPSK modulator is adjusted according to the detection result; and the DP-QPSK modulator is used for receiving the adjustment of the detection control equipment. The invention simultaneously discloses a method for controlling the phase bias point of the DP-QPSK modulator. By utilizing the system and the method, various interferences and detection inaccuracy during detection can be avoided, and then the degree of stability of the DP-QPSK modulator is ensured.
Description
Technical field
The present invention relates to the information security field in the signal processing technology, relate in particular to the method and system of a kind of control dual-polarization QPSK (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 had promoted and had been 40Gbit/s.Speed is in the correlation technique of optical transmission system of 40Gbit/s, more and more receives the attention of industry for the light phase modulation mode of representative with difference quadrature phase shift keying (DQPSK, Differential Quadrature Phase Shift Keying).Because the code element speed of DQPSK has only the half the of traditional light amplitude modulation method, for optical device to have required little many; And, because the DQPSK modulation system has superior dispersion tolerance and polarization mode dispersion tolerance limit performance, so the DQPSK modulation system is applicable to the optical transmission system of big capacity, 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 optical signal modulations mode more efficiently, superfast analog-to-digital conversion, and superfast Digital Signal Processing.The 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 the DP-QPSK modulation system has bigger spectrum utilization ratio than DQPSK modulation system, and the DP-QPSK modulation system has been utilized phase modulation technique significantly promoting of transmission rate of reply and the influence of the chromatic dispersion that brings, non-linear, polarization mode dispersion (PMD).
The DP-QPSK modulator adopts the lithium niobate material usually.Because this properties of materials of lithium niobate; It is responsive to make that the DP-QPSK modulator all compares extraneous factors such as temperature and stress; So, make the phase control of DP-QPSK modulator not receive the influence of extraneous factor, to the accurate phase control of DP-QPSK modulator; Just must produce the phase bias point that direct voltage is controlled the DP-QPSK modulator through peripheral control circuit.
At present; The method of control DP-QPSK modulator phase bias point; Be to realize through difference integrated electro detector tube (PD) on the inner two-way polarization state of DP-QPSK modulator; Be specially: on two phase bias points of DP-QPSK modulator, add the pilot signal of different frequency respectively, from two the external detection control appliance of PD detection signals; When detecting difference frequency signal,, the phase bias point is adjusted by detecting control appliance generation direct voltage according to the situation of difference frequency signal; When not detecting difference frequency signal, just think that the phase bias point has locked onto on the normal phase bias point.But, because PD is the device of high integration, receive the influence of extraneous factor through regular meeting, occur detecting less than difference frequency signal or detect inaccurate situation, this has just produced very big influence to the effect of controlling DP-QPSK modulator phase bias point.
It is thus clear that, the method for the phase bias point of present existing control DP-QPSK modulator, the influence of factor such as the detection that can't avoid highly integrated device to cause is inaccurate, thus reduced 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 the DP-QPSK of control modulator phase bias point, various interference in avoiding detecting and detection inaccurate, thus guarantee 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 the DP-QPSK of control modulator phase bias point, this system comprises: detect control appliance and DP-QPSK modulator; Wherein,
Detect control appliance, be used to carry out difference frequency signal and detect, when testing result is no difference frequency signal, do not do operation; When testing result is not no difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator;
The DP-QPSK modulator is used to receive the adjustment that detects control appliance.
In the such scheme,
Said detection control appliance also is used to produce pilot signal, and pilot signal is sent to the DP-QPSK modulator, receives the light signal after the modulation that the DP-QPSK modulator sends then, converts light signal into measured signal;
Accordingly, said DP-QPSK modulator also is used to receive and detects the signal that control appliance is sent, and the light signal after the modulation is sent to the detection control appliance.
In the such scheme, said detection control appliance specifically is used for the duration according to the measured signal that receives, and finds the pilot signal with this measured signal corresponding time slot; Utilize the error of the pilot signal calculating measured signal of corresponding time slot then, if error is zero, then testing result is no difference frequency signal; If error is non-vanishing, then testing result is the voltage of adjustment phase bias point.
In the such scheme,
Said detection control appliance; Specifically be used for when testing result is the voltage of lifting phase bias point; Come from two phase bias points of DP-QPSK modulator which based on fixed this measured signal, DC voltage is promoted fixing step value adjustment DP-QPSK modulator respective phase bias point; When testing result is to reduce the voltage of phase bias point, DC voltage is reduced fixing step value adjustment DP-QPSK modulator respective phase bias point, detect control appliance then again and carry out the difference frequency signal detection;
Accordingly, said DP-QPSK modulator specifically is used to receive the adjustment that detects control appliance.
In the such scheme, said detection control appliance comprises: difference frequency signal detection and processing module and drive circuit module; Wherein,
Difference frequency signal detects and processing module, is used to carry out difference frequency signal and detects, and when testing result is no difference frequency signal, does not do operation; When testing result was not no difference frequency signal, the instruction that will adjust direct voltage according to testing result sent to drive circuit module;
Drive circuit module is used to receive the instruction that difference frequency signal detects the adjustment direct voltage of sending with processing module, carry out the adjustment of direct voltage according to the instruction of adjustment direct voltage after, direct voltage is sent to the phase modulated point of DP-QPSK modulator.
In the such scheme, said detection control appliance also comprises: spectral module and Photoelectric Detection module; Wherein,
Said spectral module; Be used to receive the light signal after the modulation that the DP-QPSK modulator sends; Light signal after the modulation is divided into two parts; Wherein a part sends to the Photoelectric Detection module as sensed light signal, and another part mails to the equipment that DP-QPSK modulator rear end is connected as the normal output of DP-QPSK modulator;
Accordingly, said Photoelectric Detection module is used to receive the sensed light signal that spectral module is sent, and converts sensed light signal into the signal of telecommunication, the gained signal of telecommunication is sent to difference frequency signal as measured signal detect and processing module;
Said difference frequency signal detects and processing module, also is used to receive the measured signal that the Photoelectric Detection module is sent.
The present invention also provides a kind of method of the DP-QPSK of control modulator phase bias point, and this method comprises: detect control appliance and carry out difference frequency signal and detect, when testing result is no difference frequency signal, do not do operation; When testing result is not no difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator.
In the such scheme, said detection control appliance carries out before the difference frequency signal detection, and this method also comprises: detect control appliance and produce pilot signal, pilot signal is sent to the DP-QPSK modulator; Light signal after the modulation that detection control appliance reception DP-QPSK modulator is sent converts light signal into measured signal.
In the such scheme, said detection control appliance carries out difference frequency signal and detects, and comprising: detect the duration of control appliance according to the measured signal that receives, find the pilot signal with this measured signal corresponding time slot; Utilize the error of the pilot signal calculating measured signal of corresponding time slot then, if error is zero, then testing result is no difference frequency signal; If error is non-vanishing, then error is non-vanishing, and then testing result is the voltage of adjustment phase bias point.
In the such scheme; Said phase bias point according to testing result adjustment DP-QPSK modulator; Comprise: when testing result is when promoting the voltage of phase bias point; Detect in control appliance comes from the DP-QPSK modulator according to fixed this measured signal two phase bias points which, direct voltage is promoted fixing step value adjust DP-QPSK modulator respective phase bias point; When the voltage of testing result for reduction phase bias point, detect control appliance direct voltage is reduced fixing step value adjustment DP-QPSK modulator respective phase bias point, detect control appliance then again and carry out the difference frequency signal detection.
The method and system of control DP-QPSK modulator phase bias point provided by the present invention; Have following advantage and characteristics: at the external detection control appliance of the output of DP-QPSK modulator; Detect the difference frequency signal that carries on the modulated light signal through detecting control appliance; Based on the testing result that detects control appliance; Exchange straightening stream voltage and control, the phase bias point of DP-QPSK modulator is controlled; Thereby various interference and uncertainty in effectively avoiding detecting, the inspection that causes like highly integrated device is inaccurate; The present invention has higher reliability and stability.
Description of drawings
Fig. 1 forms structural representation for the system that the present invention controls DP-QPSK modulator phase bias point;
Fig. 2 detects the composition structural representation of control appliance for the present invention;
Fig. 3 controls the method flow sketch map of DP-QPSK modulator phase bias point for the present invention.
Embodiment
Basic thought of the present invention is: carry out difference frequency signal through external detection control appliance and detect, when testing result is no difference frequency signal, do not do operation; When testing result is not no difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator.
Below in conjunction with accompanying drawing and specific embodiment the present invention is remake further detailed explanation.
As shown in Figure 1, the invention provides a kind of system of the DP-QPSK of control modulator phase bias point, comprising: detect control appliance 11 and DP-QPSK modulator 12; Wherein,
Detect control appliance 11, be used to carry out difference frequency signal and detect, when testing result is no difference frequency signal, do not do operation; When testing result is not no difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator 12;
DP-QPSK modulator 12 is used to receive the adjustment that detects control appliance 11.
Said detection control appliance 11 also is used to produce pilot signal, and pilot signal is sent to DP-QPSK modulator 12; Accordingly, said DP-QPSK modulator 12 also is used to receive the pilot signal that detection control appliance 11 is sent;
Here, said 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.
Said detection control appliance 11 after specifically being used to produce pilot signal, is chosen two time slots of pilot signal; The periodic pilot signal of extracting a time slot; The pilot signal of this time slot is sent to a phase bias point of DP-QPSK modulator 12; Behind the one section duration in interval; Periodically extract the pilot signal of another time slot, the pilot signal of this time slot is sent to another phase bias point of DP-QPSK modulator 12; Accordingly, said DP-QPSK modulator 12 specifically is used for respectively on two phase bias points, receiving the pilot signal that detects the different time-gap that control appliance 11 sends;
Wherein, said periodicity: for be preset in a duration that detects in the control appliance according to actual conditions; Two time slots of said pilot signal, the principle of choosing are preset at according to actual conditions and detect in the control appliance, such as; Can in detecting control appliance, be set the cycle is T=0.3s; Preset first time slot is TS1=0.01s, and second time slot is TS2=0.015s, and the one section duration of being separated by is 0.1s; Then: the pilot signal of first time slot is sent back 0.1s, the pilot signal of sending second time slot.
Said detection control appliance 11 also is used to receive the light signal after the modulation that DP-QPSK modulator 12 sends; Accordingly, said DP-QPSK modulator 12 also is used for the light signal after the modulation is sent to detection control appliance 11.
Said detection control appliance 11 also is used for the light signal after the modulation is divided into two parts, and wherein a part is as sensed light signal, and another part mails to the equipment that DP-QPSK modulator 12 rear ends are connected as the normal output of DP-QPSK modulator 12.
Said detection control appliance 11 also is used for converting sensed light signal into the signal of telecommunication, the gained signal of telecommunication is carried out difference frequency signal as measured signal detect, if testing result is no difference frequency signal, then end operation; If testing result is not no difference frequency signal, then the phase bias point is adjusted according to testing result.
Said detection control appliance 11; Specifically be used for confirming that according to the measured signal that receives this measured signal comes from which of two phase bias points of DP-QPSK modulator 12; Utilize the error of the pilot signal calculating measured signal of corresponding time slot then; If error is zero, then testing result is no difference frequency signal; If error is non-vanishing, then testing result is the voltage of adjustment phase bias point;
Wherein, The measured signal that said basis receives confirms that which in two phase bias points of DP-QPSK modulator 12 this measured signal come from; Can utilize existing field programmable gate array (FPGAField-Programmable Gate Array) technology to realize, not do at this and give unnecessary details;
The method for the calculating difference frequency signal that the error of said calculating measured signal is used is prior art, does not do at this and gives unnecessary details.
Said detection control appliance 11; Specifically be used to preset when error is non-vanishing, produce the principle of testing result based on error: can be for when error be negative value, testing result is for promoting the voltage of phase bias point; When error is for reducing the voltage of phase bias point on the occasion of, testing result; Also can be for when error is negative value, testing result is for reducing the voltage of phase bias point, when error be on the occasion of the time, testing result is the voltage of raising phase bias point.
Said detection control appliance 11; Specifically be used for when testing result is the voltage of lifting phase bias point; Come from two phase bias points of DP-QPSK modulator 12 which based on fixed this measured signal, DC voltage is promoted fixing step value send to DP-QPSK modulator 12 respective phase bias points; When the voltage of testing result, DC voltage is reduced fixing step value send to DP-QPSK modulator 12 respective phase bias points for reduction phase bias point;
Accordingly, said DP-QPSK modulator 12 specifically is used to receive and detects the direct voltage that control appliance 11 sends and adjust the respective phase bias point;
Here, said step value is: direct voltage adjusting range value can be preset in the drive circuit module; Also can in actual mechanical process, according to circumstances the step value of drive circuit module be adjusted;
Wherein, said adjustment respective phase bias point is prior art, does not do at this and gives unnecessary details.
Said detection control appliance 11 can produce two kinds of voltages: a kind of is the pilot signal of two different time-gaps of periodicity output, and this pilot signal is an alternating voltage, another kind of direct voltage for being used to adjust.
As shown in Figure 2, said detection control appliance comprises: difference frequency signal detects and processing module 21 and drive circuit module 22; Wherein,
Difference frequency signal detects and processing module 21, is used to carry out difference frequency signal and detects, and when testing result is no difference frequency signal, does not do operation; When testing result was not no difference frequency signal, the instruction that will adjust direct voltage according to testing result sent to drive circuit module 22;
Said difference frequency signal detects and processing module 21, also is used to produce pilot signal, and pilot signal is sent to drive circuit module 22; Accordingly, said drive circuit module 22 is used to receive difference frequency signal and detects the pilot signal of sending with processing module 21, pilot signal is sent on the phase modulated point of DP-QPSK modulator.
Said drive circuit module 22 specifically is used for pilot signal is carried out amplitude limit, such as: can be limited in the 125mV for amplitude pilot signal.Said 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.
Said difference frequency signal detects and processing module 21, specifically is used for choosing earlier two time slots of pilot signal; Periodically extract the pilot signal of a time slot then, the pilot signal of this time slot is sent to a drive circuit module 22; At interval behind one section duration, periodically extract the pilot signal of another time slot again, the pilot signal of this time slot is sent to another one drive circuit module 22; Accordingly, said drive circuit module 22 after also being used for the pilot signal that difference frequency signal detects a time slot of periodically sending with processing module 21 carried out voltage amplification, sends to the phase bias point of DP-QPSK modulator.
Said detection control appliance also comprises: spectral module 23 and Photoelectric Detection module 24; Wherein,
Said spectral module 23; Be used to receive the light signal after the modulation that the DP-QPSK modulator sends; Light signal after the modulation is divided into two parts; Wherein a part sends to Photoelectric Detection module 24 as sensed light signal, and another part mails to the equipment that DP-QPSK modulator rear end is connected as the normal output of DP-QPSK modulator;
Accordingly, said Photoelectric Detection module 24 is used to receive the sensed light signal that spectral module 23 is sent.
Said Photoelectric Detection module 24 can use the low noise PIN detector tube of 10G to realize Photoelectric Detection; Said spectral module 23 can use 5%/95% branch light pipe realization, and wherein 5% light signal sends to the Photoelectric Detection module, and other 95% light signal is as the modulated light signal output of DP-QPSK modulator.
Said Photoelectric Detection module 24 also is used for converting sensed light signal into the signal of telecommunication, the gained signal of telecommunication is sent to difference frequency signal as measured signal detect and processing module 21; Accordingly, said difference frequency signal detects and processing module 21, also is used to receive the measured signal that Photoelectric Detection module 24 is sent.
Said difference frequency signal detects and processing module 21, specifically is used for carrying out to measured signal difference frequency signal and detects, if testing result is no difference frequency signal, then end operation; If testing result is not no difference frequency signal, then the phase bias point is adjusted according to testing result.
Said difference frequency signal detects and processing module 21; Specifically be used for confirming that based on the measured signal that receives this measured signal comes from which of two phase bias points of DP-QPSK modulator; Utilize the error of the pilot signal calculating measured signal of corresponding time slot then; If error is zero, then testing result is no difference frequency signal; If error signal is a negative value, then testing result is the voltage that will promote phase bias point; If error is non-vanishing, then testing result is the voltage of adjustment phase bias point.
Said difference frequency signal detects and processing module 21; Specifically be used to preset when error is non-vanishing; Produce the principle of testing result based on error: can be for when error is negative value; Testing result is for promoting the voltage of phase bias point; When error is for reducing the voltage of phase bias point on the occasion of, testing result; Also can be for when error is negative value, testing result is for reducing the voltage of phase bias point, when error be on the occasion of the time, testing result is the voltage of raising phase bias point.
Said difference frequency signal detects and processing module 21; Specifically be used for when testing result is the voltage of lifting phase bias point; Send the instruction that direct voltage is promoted fixing step value to drive circuit module 22; When testing result is when reducing the voltage of phase bias point, send the instruction that direct voltage is reduced fixing step value to drive circuit module 22; Accordingly; Said drive circuit module 22; Also be used to receive difference frequency signal and detect the instruction of sending, if instruction then promotes direct voltage the fixed step size value, sends to the DP-QPSK modulator for voltage is promoted fixing step value with processing module 21; If instruction then reduces direct voltage the fixed step size value, sends to the DP-QPSK modulator for voltage is reduced fixing step value.
It is as shown in Figure 3 that the present invention controls the method for DP-QPSK modulator phase bias point, may further comprise the steps:
Step 301: detect control appliance and produce pilot signal, pilot signal is sent to the DP-QPSK modulator.
Here, said pilot signal is sent to the DP-QPSK modulator, comprising: detect two time slots that control appliance is chosen pilot signal earlier; Periodically extract the pilot signal of a time slot then; The pilot signal of this time slot is sent to a phase bias point of DP-QPSK modulator; Behind the one section duration in interval; Periodically extract the pilot signal of another time slot, the pilot signal of this time slot is sent to another phase bias point of DP-QPSK modulator.
Light signal after step 302:DP-QPSK modulator will be modulated sends to the detection control appliance, detects control appliance and converts light signal into measured signal.
Here; Saidly convert light signal into measured signal and be: detect control appliance and earlier light signal is divided into two parts; Wherein a part is as sensed light signal, and another part mails to the equipment that DP-QPSK modulator rear end is connected as the normal output of DP-QPSK modulator; Detect control appliance and convert sensed light signal into the signal of telecommunication again, with the gained signal of telecommunication as measured signal.
Step 303: detect control appliance and carry out the difference frequency signal detection to measured signal, if testing result is no difference frequency signal, then end process flow process; If testing result is not no difference frequency signal, then execution in step 304.
Here, said difference frequency signal detects and is: detect the duration of control appliance according to the measured signal that receives, find the pilot signal with this measured signal corresponding time slot, confirm that which in two phase bias points of DP-QPSK modulator this measured signal come from; Utilize the error of the pilot signal calculating measured signal of corresponding time slot then, if error is zero, then testing result is no difference frequency signal; If error is non-vanishing, then testing result is the voltage of adjustment phase bias point;
Wherein, If said error is non-vanishing; Then testing result is the voltage of adjustment phase bias point; Be specially: when error is non-vanishing; The principle based on error generation testing result that use is preset obtains final detection result, can be for when error be negative value, and testing result is for promoting the voltage of phase bias point; When error is for reducing the voltage of phase bias point on the occasion of, testing result; Also can be for when error is negative value, testing result is for reducing the voltage of phase bias point, when error be on the occasion of the time, testing result is the voltage of raising phase bias point.
Step 304: detect control appliance and the phase bias point is adjusted, return step 301 then according to testing result;
This step is specially: when testing result is when promoting the voltage of phase bias point; Detect in control appliance comes from the DP-QPSK modulator based on fixed this measured signal two phase bias points which, DC voltage is promoted fixing step value adjust DP-QPSK modulator respective phase bias point; When the voltage of testing result for reduction phase bias point, detect control appliance DC voltage is reduced fixing step value adjustment DP-QPSK modulator respective phase bias point, return step 301 then.
It is thus clear that; Through said method,, change at the external detection control appliance of the output of DP-QPSK modulator with the detection mode of former cause from the external checkout equipment of PD; Detect the difference frequency signal that carries on the modulated light signal through detecting control appliance; Thereby various interference and uncertainty in effectively avoiding detecting have higher reliability and stability.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (10)
1. a system that controls dual-polarization QPSK DP-QPSK modulator phase bias point is characterized in that this system comprises: detect control appliance and DP-QPSK modulator; Wherein,
Detect control appliance, be used to carry out difference frequency signal and detect, when testing result is no difference frequency signal, do not do operation; When testing result is not no difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator;
The DP-QPSK modulator is used to receive the adjustment that detects control appliance.
2. system according to claim 1 is characterized in that,
Said detection control appliance also is used to produce pilot signal, and pilot signal is sent to the DP-QPSK modulator, receives the light signal after the modulation that the DP-QPSK modulator sends then, converts light signal into measured signal;
Accordingly, said DP-QPSK modulator also is used to receive and detects the signal that control appliance is sent, and the light signal after the modulation is sent to the detection control appliance.
3. system according to claim 2 is characterized in that,
Said detection control appliance specifically is used for the duration according to the measured signal that receives, and finds the pilot signal with this measured signal corresponding time slot; Utilize the error of the pilot signal calculating measured signal of corresponding time slot then, if error is zero, then testing result is no difference frequency signal; If error is non-vanishing, then testing result is the voltage of adjustment phase bias point.
4. system according to claim 3 is characterized in that,
Said detection control appliance; Specifically be used for when testing result is the voltage of lifting phase bias point; Come from two phase bias points of DP-QPSK modulator which based on fixed this measured signal, DC voltage is promoted fixing step value adjustment DP-QPSK modulator respective phase bias point; When testing result is to reduce the voltage of phase bias point, DC voltage is reduced fixing step value adjustment DP-QPSK modulator respective phase bias point, detect control appliance then again and carry out the difference frequency signal detection;
Accordingly, said DP-QPSK modulator specifically is used to receive the adjustment that detects control appliance.
5. system according to claim 4 is characterized in that, said detection control appliance comprises: difference frequency signal detection and processing module and drive circuit module; Wherein,
Difference frequency signal detects and processing module, is used to carry out difference frequency signal and detects, and when testing result is no difference frequency signal, does not do operation; When testing result was not no difference frequency signal, the instruction that will adjust direct voltage according to testing result sent to drive circuit module;
Drive circuit module is used to receive the instruction that difference frequency signal detects the adjustment direct voltage of sending with processing module, carry out the adjustment of direct voltage according to the instruction of adjustment direct voltage after, direct voltage is sent to the phase modulated point of DP-QPSK modulator.
6. system according to claim 5 is characterized in that, said detection control appliance also comprises: spectral module and Photoelectric Detection module; Wherein,
Said spectral module; Be used to receive the light signal after the modulation that the DP-QPSK modulator sends; Light signal after the modulation is divided into two parts; Wherein a part sends to the Photoelectric Detection module as sensed light signal, and another part mails to the equipment that DP-QPSK modulator rear end is connected as the normal output of DP-QPSK modulator;
Accordingly, said Photoelectric Detection module is used to receive the sensed light signal that spectral module is sent, and converts sensed light signal into the signal of telecommunication, the gained signal of telecommunication is sent to difference frequency signal as measured signal detect and processing module;
Said difference frequency signal detects and processing module, also is used to receive the measured signal that the Photoelectric Detection module is sent.
7. a method of controlling DP-QPSK modulator phase bias point is characterized in that, this method comprises: detect control appliance and carry out difference frequency signal and detect, when testing result is no difference frequency signal, do not do operation; When testing result is not no difference frequency signal, according to the phase bias point of testing result adjustment DP-QPSK modulator.
8. method according to claim 7 is characterized in that, said detection control appliance carries out before the difference frequency signal detection, and this method also comprises: detect control appliance and produce pilot signal, pilot signal is sent to the DP-QPSK modulator; Light signal after the modulation that detection control appliance reception DP-QPSK modulator is sent converts light signal into measured signal.
9. method according to claim 7 is characterized in that, said detection control appliance carries out difference frequency signal and detects, and comprising: detect the duration of control appliance according to the measured signal that receives, find the pilot signal with this measured signal corresponding time slot; Utilize the error of the pilot signal calculating measured signal of corresponding time slot then, if error is zero, then testing result is no difference frequency signal; If error is non-vanishing, then error is non-vanishing, and then testing result is the voltage of adjustment phase bias point.
10. method according to claim 7; It is characterized in that; Said phase bias point according to testing result adjustment DP-QPSK modulator; Comprise: when testing result when promoting the voltage of phase bias point, detect in control appliance comes from the DP-QPSK modulator according to fixed this measured signal two phase bias points which, direct voltage is promoted the step value of fixing adjusts DP-QPSK modulator respective phase bias point; When the voltage of testing result for reduction phase bias point, detect control appliance direct voltage is reduced fixing step value adjustment DP-QPSK modulator respective phase bias point, detect control appliance then again and carry out the difference frequency signal detection.
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|---|---|---|---|---|
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1523400A (en) * | 2003-02-20 | 2004-08-25 | 北京世维通光通讯技术有限公司 | LiNbO modulator DC operating point control device and method |
| 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 |
-
2011
- 2011-10-08 CN CN201110299925.7A patent/CN102333056B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1523400A (en) * | 2003-02-20 | 2004-08-25 | 北京世维通光通讯技术有限公司 | LiNbO modulator DC operating point control device and method |
| 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 |
|---|---|---|---|---|
| CN103595482A (en) * | 2013-11-08 | 2014-02-19 | 武汉邮电科学研究院 | Bias control device and method suitable for dual-polarization IQ modulator |
| CN103595482B (en) * | 2013-11-08 | 2015-12-30 | 武汉邮电科学研究院 | Be applicable to bias control device and the method for dual-polarization I/Q modulator |
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