CN101621329A - Method and system for measuring bias points of double-parallel modulator - Google Patents
Method and system for measuring bias points of double-parallel modulator Download PDFInfo
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- CN101621329A CN101621329A CN200810029196A CN200810029196A CN101621329A CN 101621329 A CN101621329 A CN 101621329A CN 200810029196 A CN200810029196 A CN 200810029196A CN 200810029196 A CN200810029196 A CN 200810029196A CN 101621329 A CN101621329 A CN 101621329A
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Abstract
The embodiment of the invention discloses a method and a system for measuring bias points of a double-parallel modulator, wherein the method comprises the following steps: controlling the amplitude value of the bias voltage acting on the double-parallel modulator to increase progressively through a first step value; converting an optical signal output by the double-parallel modulator under the action of the bias voltage into an electric signal; detecting the amplitude value of the electric signal, and stopping the progressive increase of the amplitude value of the bias voltage when the amplitude value of the electric signal satisfying the condition for measuring the bias points appears; and using a second step value to scan the amplitude value of the bias voltage corresponding to the amplitude value of the electric signal satisfying the condition for measuring the bias points according to the corresponding relation between the amplitude value of the electric signal and the amplitude value of the bias voltage, and calculating the bias points, wherein the first step value is larger than the second step value. By adopting the embodiment of the invention, the method and the system have the advantages of reducing the interferences between a plurality of frequencies and improving the efficiency of measuring the bias points.
Description
Technical field
The present invention relates to the access network technology of mobile communications network, relate in particular to a kind of method of measurement and system of bias points of double-parallel modulator.
Background technology
During transmitting, signal can be subjected to the influence of chromatic dispersion in optical fiber, so-called chromatic dispersion is exactly the wave distortion that the various mode component transmission speed differences of the different frequency component of institute's transmission signals in the optical fiber or signal cause signal, the main influence that chromatic dispersion brings optical transmission is to make to produce intersymbol interference between data pulse, the damage that chromatic dispersion brings systematic function be can not ignore, and the general fiber optic transmission system of transmission rate more than 10Gbit/s all needs the dispersion compensation technology to guarantee the transfer function of system.
Present widely used dispersion compensation technology is to realize dispersion compensation by the dispersion compensating fiber opposite with the delivery fiber dispersion characteristic (DCF, Dispersion Compensation Fiber).Though this dispersion compensation mode is easy to use, but also defectiveness, be that volume is bigger, there is time-delay in signal, need amplifier to carry out the compensation of excess loss, cost is higher, and this compensation way can not provide variable dispersion compensating flexibly, though it is very practical in the optical transmission system of point-to-point, but being applied in complicated has on the wavelength/the flexible network of network, especially dynamic reconfigurable down in the time because light compensates the transmission path difference of process, the chromatic dispersion of being experienced is also different, and the compensation way of DCF is difficult to satisfy application demand.
In recent years, electric territory dispersion compensation had caused technical staff's concern, so-called electric territory dispersion compensation be meant in optical transmission system transmitter module or receiver module by electric territory signal processing mode partially or completely compensation of dispersion to the deterioration of transmission signals.Carry out square detection that electric territory dispersion post-compensation mainly is subject to photodetector at receiving terminal,, carry out the dispersion compensation ability that electric territory dispersion pre-compensation then has long distance at transmitting terminal so its compensation ability is limited.
Transmitting terminal dispersion pre-compensation mode can realize the compensation of thousands of kilometers transmission ranges, but must receive near predetermined complementary range.If owing to reasons such as wavelength route make transmission range change, launching dynamo-electric territory also needs to change the parameter of digital processing and the parameter of transmitter hardware.The bias voltage that experiment showed, the electrooptic modulator that different transmission ranges requires is also different.The electrooptic modulator here can use a kind of special modulator---Mach-Ze De double-parallel modulator (DPMZ, Dual Parallel Mach-zehnder).
The DPMZ modulator can be regarded two amplitude modulation modulators as, i.e. Mach-Ze De modulator (MZM, Mach-zender Modulator) is formed as the MZM1 among the figure and MZM2 and a phase modulation modulator (being generally the phase-shifter of p/2).
Need to prove, need data signals transmitted, obtain two paths of data and be respectively Iin and Qin through after the precoding processing.The light of light source output is divided into up and down, and two-way outputs to described two MZM modulators up and down respectively, Iin and Qin modulate each road light and obtain differential phase keying (DPSK) sign indicating number (DPSK, DifferentialPhase Shift Keying), and one road light that will output to the MZM modulator carries out the phase shift of P/2, thereby obtain difference quadrature phase shift keying codes (DQPSK, Differential Quadrature Phase ShiftKeying) light signal at output.
Owing to need regulate, thereby must measure the initial voltage V0 of DPMZ modulator and half-wave voltage Vpi and Vpi ' to any bias point of described DPMZ modulator.
The initial voltage V0 of DPMZ modulator and half-wave voltage Vpi be as shown in Figure 2:
Among Fig. 2, V0 is first luminous power peak value corresponding voltage value of modulator, and for MZM1 and MZM2, Vpi is poor from peak value to adjacent peak dot corresponding voltage value, for the phase modulation modulator, Vpi is that peak value arrives the poor of adjacent valley point corresponding voltage value.
Prior art provides a kind of bias point of the DPMZ of making modulator stable method, as shown in Figure 3:
In this method, adopt 3 scrambling frequency f 1, f2 and f3, constitute three loops 15.1,15.2,15.3 respectively, the bias point of double-parallel modulator 1 adopts the PD13 of 20G to receive detection.
The 3rd bias point is the Vpi/2 test point.Need bit-by-bit (bit) to detect the phase difference that could get between the primary data and whether remain on Vpi/2, if not when the Vpi/2, output has a slight spike, this spike is difficult to detect, need to adopt light detector tube (PD at a high speed, Photo Detector), and the PD that need possess the detection peak ability just can detect, and such PD device is very expensive.
The inventor finds that there are the following problems for prior art in implementing process of the present invention:
Prior art adopts a plurality of scrambling frequencies to control, and can cause mutual interference, and receives the PD pipe that PD adopts high speed, cost costliness.
Summary of the invention
The embodiment of the invention provides a kind of method of measurement and system of bias points of double-parallel modulator, reduces the interference between a plurality of frequencies, has improved the efficient of measuring bias point.
The embodiment of the invention provides a kind of method of measurement of bias points of double-parallel modulator, comprising:
Control action increases progressively with first step value in the range value of the bias voltage of double-parallel modulator;
The light signal that double-parallel modulator is exported under the effect of described bias voltage is converted into the signal of telecommunication;
Detect the range value of the described signal of telecommunication, when occurring satisfying the range value of the signal of telecommunication of measuring the bias point condition, stop to increase progressively the range value of described bias voltage;
According to the corresponding relation between the range value of the range value of the described signal of telecommunication and described bias voltage, scan the range value of the pairing bias voltage of range value of the signal of telecommunication of described satisfied measurement bias point condition with second step value, calculate bias point; Described first step value is greater than second step value.
Correspondingly, the embodiment of the invention provides a kind of measuring system of bias points of double-parallel modulator, comprising:
Controller is used for control action and increases progressively with first step value in the range value of the bias voltage of double-parallel modulator;
Double-parallel modulator is used for exporting light signal under the effect of described bias voltage;
Testing circuit is used for the light signal that double-parallel modulator is exported under the effect of described bias voltage is converted into the signal of telecommunication; And detect the range value of the described signal of telecommunication;
When occurring satisfying the range value of the signal of telecommunication of measuring the bias point condition, described controller stops to increase progressively the range value of described bias voltage;
Described testing circuit also is used for according to the corresponding relation between the range value of the range value of the described signal of telecommunication and described bias voltage, scan the range value of the pairing bias voltage of range value of the signal of telecommunication of described satisfied measurement bias point condition with second step value, calculate bias point; Described first step value is greater than second step value.
Implement the present invention, have following beneficial effect:
The method of measurement of a kind of bias points of double-parallel modulator that the embodiment of the invention provides and system do not need to adopt a plurality of frequencies to be controlled, and have reduced the interference between a plurality of frequencies, have simplified system configuration, have improved the efficient of measuring bias point.
Description of drawings
Fig. 1 is the composition schematic diagram of the DPMZ of prior art;
Fig. 2 is the initial voltage of DPMZ of prior art and the schematic diagram of half-wave voltage;
Fig. 3 be prior art DPMZ is carried out the schematic diagram that bias point detects;
Fig. 4 is the structural representation of measuring system first embodiment of the bias points of double-parallel modulator that provides of the embodiment of the invention;
Fig. 5 is the structural representation of measuring system second embodiment of the bias points of double-parallel modulator that provides of the embodiment of the invention;
Fig. 6 is the schematic flow sheet of method of measurement first embodiment of the bias points of double-parallel modulator that provides of the embodiment of the invention;
Fig. 7 is the schematic flow sheet of method of measurement second embodiment of the bias points of double-parallel modulator that provides of the embodiment of the invention;
Fig. 8 is the schematic flow sheet of method of measurement the 3rd embodiment of the bias points of double-parallel modulator that provides of the embodiment of the invention.
Embodiment
Referring to Fig. 4, the measuring system of the bias points of double-parallel modulator that the embodiment of the invention provides is by double-parallel modulator 1 (DPMZ1), controller 2, and offset controller 3 (BC, Bias Control), and testing circuit 4 is formed.
At first explanation is, the bias point of so-called double-parallel modulator, be actually two the MZM modulators of instigating in the double-parallel modulator and the magnitude of voltage of phase modulation modulator stable work, therefore, measure bias point, when promptly measuring the work of MZM modulator in double-parallel modulator and phase modulation modulator stable, the initial voltage and the half-wave voltage of the offset controller that two MZM modulators and phase modulation modulator are connected separately.
Biasing T10 is used to connect described offset controller 3, receive offset controller 3 bias voltage and and data-signal superpose, output offset voltage data signal is to double-parallel modulator 1; Need to prove that the data-signal that superposes with bias voltage is the data signals transmitted that needs of process precoding processing, this is that those skilled in the art is known, and the background technology part also has detailed description to this, does not repeat them here.
Double-parallel modulator 1, by up and down two MZM modulators and a phase modulation modulator (being generally the phase-shifter of p/2) are formed, described phase modulation modulator is connected on the MZM modulator, described two MZM modulators, under the effect of described bias voltage data-signal, respectively input light is wherein modulated, obtain the QPSK light signal, and the phase modulation modulator that last MZM modulator connects is exported the DQPSK light signal at last to carrying out the phase shift of p/2 through the light after the MZM modulation;
Need to prove, the initial voltage of described offset controller 3 and half-wave voltage are the testing result of testing circuit 4, testing circuit will offer described controller 2 to this testing result, the described testing result of described controller 2 storages, and as the control signal of controlling described double-parallel modulator 1.
The measuring system of the bias points of double-parallel modulator that the enforcement embodiment of the invention provides does not need to adopt a plurality of frequencies to be controlled, and has reduced the interference between a plurality of frequencies, has simplified system configuration, has improved the efficient of measuring bias point.
Referring to Fig. 5, the measuring system of the bias points of double-parallel modulator that the invention process provides.
Described measuring system is by DPMZ1, biasing T, and controller 2, offset controller 3 (BC3), and testing circuit 4 forms, wherein testing circuit 4 is again by optical splitter 40, PD pipe 41, amplitude adjustable amplifier 42, filter 43, analog to digital converter 44 (ADC44) constitutes.
Need to prove that the biasing T of described double-parallel modulator 1 has two, as shown in Figure 4, biasing T100 connects the port one 10 (port110) of the modulator that is used for amplitude modulation, and biasing T101 connects the port one 11 (port111) of the modulator that is used for amplitude modulation.
Described offset controller 3 (BC3) comprises three, be respectively the offset controller 30 (BC30) that is connected with described biasing T100, the offset controller 31 (BC31) that is connected with the described T101 of biasing and with the direct-connected offset controller 32 of described DPMZ1.
Offset controller 30 (BC30) is under the control of first control signal of controller 2 outputs, output offset voltage is in biasing T100, biasing T100 superposes bias voltage and data-signal (Data), and output offset voltage data signal is to the port one 10 (port110) of DPMZ1;
Described DPMZ1 exports light signal under the effect of the described bias voltage of being imported by offset controller 30;
At this moment, described first initial voltage and first half-wave voltage of controller 2 these testing result correspondences of storage, the value of the bias voltage of the output of described offset controller 30 is set to described first initial voltage, and export second control signal and give offset controller 31, described offset controller 31 is under the control of second control signal, output offset voltage is in biasing T101, biasing T101 superposes bias voltage and data-signal (Data), and output offset voltage data signal is to the port one 11 (port111) of DPMZ1;
Described DPMZ1 exports light signal under the effect of the described bias voltage of being imported by offset controller 31;
At this moment, described second initial voltage and second half-wave voltage of controller 2 these testing result correspondences of storage, the value of the output offset voltage of described offset controller 31 is set to described second initial voltage, and export the 3rd control signal and give offset controller 32, described offset controller 32 is under the control of second control signal, and output offset voltage is to the port one 12 (port112) of DPMZ1;
Described DPMZ1 exports light signal under the effect of the described biased electrical of being imported by offset controller 32;
At this moment, described the 3rd initial voltage and the 3rd half-wave voltage of controller 2 these testing result correspondences of storage.
The 3rd initial voltage of second initial voltage of first initial voltage of offset controller 30 and first half-wave voltage, offset controller 31 and second half-wave voltage, offset controller 32 and the 3rd half-wave voltage, be the bias point of each offset controller, described controller 2 stores described each bias point, in optical transmission process, according to the needs of different transmission ranges, modulate described DPMZ1 according to described bias point.
Describe the function and the structure of testing circuit 4 below in detail, particularly, with testing circuit 4, the light signal of described DPMZ1 output is converted into the signal of telecommunication, and the described signal of telecommunication carried out amplitude detection, detect first initial voltage and first half-wave voltage of offset controller 30, output to as testing result and be the example explanation in the controller 2.
In embodiments of the present invention, controller 2 outputs first control signal is given offset controller 30, under the control of first control signal, the bias voltage of offset controller 30 outputs is to increase considerably, for example the amplitude with 0.5V increases, 4 of testing circuits carry out amplitude detection with bigger step value (for example 0.5V) at interval to the signal of telecommunication, and the described signal of telecommunication is the signal of telecommunication that light signal that DPMZ1 exports under the effect of the bias voltage of offset controller 30 outputs is converted into; Testing circuit 4 calculates the initial voltage and the half-wave voltage of offset controller 30 with less step value (for example being spaced apart 0.05V) scanning, particularly, at first detect the peak value that light signal that described DPMZ1 exports is converted into the signal of telecommunication under the effect of the bias voltage of offset controller 30 output; When detecting the peak value of two adjacent signals of telecommunication, the difference of the bias voltage of first peak value and second peak value correspondence is designated as first half-wave voltage, the value of the bias voltage of first peak value correspondence is designated as first initial voltage;
Then, the value of offset controller 30 output offset voltages is set to described first initial voltage, controller 2 is again to offset controller 31 outputs second control signal, under the control of second control signal, the bias voltage of offset controller 31 outputs is to increase considerably, for example the amplitude with 0.5V increases, 4 of testing circuits carry out amplitude detection with bigger step value (for example 0.5V) at interval to the signal of telecommunication, and this signal of telecommunication is the signal of telecommunication that light signal that DPMZ1 exports under the effect of the bias voltage of offset controller 31 outputs is converted into; Testing circuit 4 calculates the initial voltage and the half-wave voltage of offset controller 31 with less step value (for example being spaced apart 0.05V) scanning, particularly, at first detect the peak value that light signal that described DPMZ1 exports is converted into the signal of telecommunication under the effect of the bias voltage of offset controller 31 output; When detecting the peak value of two adjacent signals of telecommunication, the difference of the bias voltage of first peak value and second peak value correspondence is designated as second half-wave voltage, the value of the bias voltage of first peak value correspondence is designated as second initial voltage;
Then, the value of offset controller 31 output offset voltages is set to described second initial voltage, controller 2 is again to offset controller 32 outputs the 3rd control signal, under the control of the 3rd control signal, the bias voltage of offset controller 32 outputs is to increase considerably, for example the amplitude with 0.5V increases, 4 of testing circuits carry out amplitude detection with bigger step value (for example 0.5V) at interval to the signal of telecommunication, the signal of telecommunication that this signal of telecommunication light signal that to be DPMZ1 export under the effect of the bias voltage of offset controller 32 outputs is converted into, testing circuit 4 calculates the initial voltage and the half-wave voltage of offset controller 32 with less step value (for example being spaced apart 0.05V) scanning, particularly, at first detect peak value and the valley that light signal that described DPMZ1 exports is converted into the signal of telecommunication under the effect of the bias voltage of offset controller 32 output; When peak value that detects two adjacent signals of telecommunication and valley, the difference of the bias voltage of described peak value and valley correspondence is designated as the 3rd half-wave voltage, the value of the bias voltage of described peak value correspondence is designated as the 3rd initial voltage;
The 3rd initial voltage of second initial voltage of first initial voltage of offset controller 30 and first half-wave voltage, offset controller 31 and second half-wave voltage, offset controller 32 and the 3rd half-wave voltage, be the bias point of each offset controller, described controller 2 stores described each bias point, in optical transmission process, according to the needs of different transmission ranges, modulate described DPMZ1 according to described bias point.
Below only be a kind of execution mode, the present invention gives the another kind of initial voltage of each offset controller and the mode of half-wave voltage calculated, and is specially:
4 of testing circuits with bigger step value (for example 0.5V) at interval under the effect of the bias voltage of offset controller 30 outputs, the amplitude that the light signal of DPMZ1 output is converted into the signal of telecommunication detects, and under the effect of the bias voltage that offset controller 32 is exported, the amplitude that the light signal of DPMZ1 output is converted into the signal of telecommunication detects;
The size of x1 and x2 relatively is defined as first initial voltage value of offset controller 30 correspondences with smaller among both, and the size of y1 and y2 relatively is defined as smaller among both the 3rd initial voltage value of offset controller 32 correspondences;
Calculate the difference of x1 and x2, this difference is first half-wave voltage of offset controller 30 correspondences, calculates the difference of y1 and y2, and this difference is the 3rd half-wave voltage of offset controller 32 correspondences;
The value of the bias voltage of offset controller 30 outputs is set to the described first definite initial voltage, and the value of the bias voltage of offset controller 32 outputs is set to described the 3rd definite initial voltage;
To under the effect of the bias voltage of offset controller 31 outputs, the amplitude that the light signal of DPMZ1 output is converted into the signal of telecommunication detects with bigger step value (for example 0.5V) at interval for 4 of testing circuits;
The 3rd initial voltage of second initial voltage of first initial voltage of offset controller 30 and first half-wave voltage, offset controller 31 and second half-wave voltage, offset controller 32 and the 3rd half-wave voltage, be the bias point of each offset controller, described controller 2 stores described each bias point, in optical transmission process, according to the needs of different transmission ranges, modulate described DPMZ1 according to described bias point.
Referring to Fig. 6, the schematic flow sheet of method of measurement first embodiment of the bias points of double-parallel modulator that provides for the embodiment of the invention.
The method of measurement of the bias points of double-parallel modulator that present embodiment provides comprises:
Step 102 detects the range value of the described signal of telecommunication, when occurring satisfying the range value of the signal of telecommunication of measuring the bias point condition, stops to increase progressively the range value of described bias voltage;
Need to prove that described measurement bias point condition comprises:
Two peak values of range value appearance when the signal of telecommunication; Or
A range value peak value of appearance or a valley when the signal of telecommunication.
Particularly, according to the corresponding relation between the range value of the range value of the described signal of telecommunication and described bias voltage, scan the range value of described two pairing bias voltages of peak value with second step value, calculate range value poor of described two pairing bias voltages of peak value, be designated as half-wave voltage, the range value of the bias voltage of first peak value correspondence is designated as initial voltage; Described half-wave voltage and initial voltage are the bias point of double-parallel modulator; Or
According to the corresponding relation between the range value of the range value of the described signal of telecommunication and described bias voltage, scan the range value of described peak value and the pairing bias voltage of valley with second step value, calculate range value poor of described peak value and the pairing bias voltage of valley, be designated as half-wave voltage, the range value of the bias voltage of first peak value correspondence is designated as initial voltage; Described half-wave voltage and initial voltage are the bias point of double-parallel modulator.
The method of measurement of the bias points of double-parallel modulator that the enforcement embodiment of the invention provides does not need to adopt a plurality of frequencies to be controlled, and has reduced the interference between a plurality of frequencies, has improved the efficient of measuring bias point.
Referring to Fig. 7, the schematic flow sheet of second embodiment of the bias points of double-parallel modulator method of measurement that provides for the embodiment of the invention.
In the present embodiment, described double-parallel modulator is made of the first amplitude modulation modulator, the second amplitude modulation modulator, the 3rd phase modulation modulator, and the method for measurement of described bias points of double-parallel modulator then comprises:
Step 200 is sent first control signal to first offset controller that is connected with the first amplitude modulation modulator, and the range value of controlling the bias voltage of described first offset controller output increases progressively with first step value;
Step 202 detects the range value of the described signal of telecommunication, when two peak values appear in the signal of telecommunication, stops to increase progressively the range value of the bias voltage of described first offset controller output;
Step 205 is sent second control signal to second offset controller that is connected with the second amplitude modulation modulator, and the range value of controlling the bias voltage of described second offset controller output increases progressively with first step value;
Step 207 detects the range value of the described signal of telecommunication, when two peak values appear in the signal of telecommunication, stops to increase progressively the range value of the bias voltage of described second offset controller output;
Step 210 is sent the 3rd control signal to the 3rd offset controller that is connected with the 3rd amplitude modulation modulator, and the range value of controlling the bias voltage of described the 3rd offset controller output increases progressively with first step value;
Step 212 detects the range value of the described signal of telecommunication, when a peak value and a valley appear in the signal of telecommunication, stops to increase progressively the range value of the bias voltage of described the 3rd offset controller output;
The method of measurement of the bias points of double-parallel modulator that the enforcement embodiment of the invention provides, do not need to adopt a plurality of frequencies to be controlled, reduced the interference between a plurality of frequencies, simplified system configuration, and only need adopt the PD of cheap low speed that the signal of telecommunication is detected, calculate the initial voltage and the half-wave voltage of the offset controller of described double-parallel modulator, reduced cost, improved the efficient of measuring bias point.
Referring to Fig. 8, the schematic flow sheet of the 3rd embodiment of the bias points of double-parallel modulator method of measurement that provides for the embodiment of the invention.
In the present embodiment, described double-parallel modulator is made of the first amplitude modulation modulator, the second amplitude modulation modulator, the 3rd phase modulation modulator, and the method for measurement of described bias points of double-parallel modulator then comprises:
Step 301, the light signal that double-parallel modulator is exported under the effect of the bias voltage of described first offset controller and the output of the 3rd offset controller is converted into the signal of telecommunication;
Step 302 detects the range value of the described signal of telecommunication, when two peak values appear in the signal of telecommunication, stops to increase progressively the range value of the bias voltage of described first offset controller and the output of the 3rd offset controller;
Step 303, write down first peak value and the second peak value correspondence coordinate (x1, y1) and (x2, y2), wherein X represents the value of the bias voltage of first offset controller output, Y represents the value of the bias voltage of the 3rd offset controller output;
Step 304, according to the corresponding relation between the range value of the bias voltage of the range value of the described signal of telecommunication and described first offset controller and the output of the 3rd offset controller, scan the range value of two pairing bias voltages of peak value of the described signal of telecommunication with second step value, calculate poor (x1-x2) of the range value of the pairing first offset controller output offset voltage of described two peak values, be designated as first half-wave voltage, calculate poor (y1-y2) of the range value of pairing the 3rd offset controller output offset voltage of described two peak values, be designated as the 3rd half-wave voltage, the range value of the bias voltage of smaller's correspondence is designated as first initial voltage among x1 and the x2; The range value of the bias voltage of smaller's correspondence is designated as the 3rd initial voltage among y1 and the y2; Described first half-wave voltage and first initial voltage are first bias point of double-parallel modulator, and described the 3rd half-wave voltage and the 3rd initial voltage are the 3rd bias point of double-parallel modulator, and described first step value is greater than second step value;
Step 305, the bias voltage of first offset controller output that the described first amplitude modulation modulator connects is set to described first initial voltage; The bias voltage of the 3rd offset controller output that described the 3rd phase modulation modulator connects is set to described the 3rd initial voltage;
Step 306 is sent second control signal to second offset controller that is connected with the second amplitude modulation modulator, and the range value of controlling the bias voltage of described second offset controller output increases progressively with first step value;
Step 307, the light signal that double-parallel modulator is exported under the effect of the bias voltage of described second offset controller output is converted into the signal of telecommunication;
Step 308 detects the range value of the described signal of telecommunication, when two peak values appear in the signal of telecommunication, stops to increase progressively the range value of the bias voltage of described second offset controller output;
Step 309, according to the corresponding relation between the range value of the bias voltage of the range value of the described signal of telecommunication and the output of described second offset controller, scan the range value of two pairing bias voltages of peak value of the described signal of telecommunication with second step value, calculate range value poor of described two pairing bias voltages of peak value, be designated as second half-wave voltage, the range value of the bias voltage of first peak value correspondence is designated as second initial voltage; Described second half-wave voltage and second initial voltage are second bias point of double-parallel modulator, and described first step value is greater than second step value;
Step 310, with described first bias point, second bias point, the 3rd bias point stores, and is used for according to different transmission needs, the bias voltage of control action and described double-parallel modulator.
The method of measurement and the system of the bias points of double-parallel modulator that the enforcement embodiment of the invention provides, do not need to adopt a plurality of frequencies to be controlled, reduced the interference between a plurality of frequencies, simplified system configuration, and only need adopt the PD of cheap low speed that the signal of telecommunication is detected, calculate the initial voltage and the half-wave voltage of the offset controller of described double-parallel modulator, reduced cost, improved the efficient of measuring bias point.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
Above disclosed is a kind of preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (13)
1, a kind of method of measurement of bias points of double-parallel modulator is characterized in that, comprising:
Control action increases progressively with first step value in the range value of the bias voltage of double-parallel modulator;
The light signal that double-parallel modulator is exported under the effect of described bias voltage is converted into the signal of telecommunication;
Detect the range value of the described signal of telecommunication, when occurring satisfying the range value of the signal of telecommunication of measuring the bias point condition, stop to increase progressively the range value of described bias voltage;
According to the corresponding relation between the range value of the range value of the described signal of telecommunication and described bias voltage, scan the range value of the pairing bias voltage of range value of the signal of telecommunication of described satisfied measurement bias point condition with second step value, calculate bias point; Described first step value is greater than second step value.
2, the method for measurement of bias points of double-parallel modulator as claimed in claim 1 is characterized in that, described measurement bias point condition comprises:
Two peak values of range value appearance when the signal of telecommunication; Or
A range value peak value of appearance or a valley when the signal of telecommunication.
3, the method for measurement of bias points of double-parallel modulator as claimed in claim 2, it is characterized in that, according to the corresponding relation between the range value of the range value of the described signal of telecommunication and described bias voltage, scan the range value of the pairing bias voltage of range value of the signal of telecommunication of described satisfied measurement bias point condition with second step value, calculate the bias point of double-parallel modulator, comprising:
According to the corresponding relation between the range value of the range value of the described signal of telecommunication and described bias voltage, scan the range value of described two pairing bias voltages of peak value with second step value, calculate range value poor of described two pairing bias voltages of peak value, be designated as half-wave voltage, the range value of the bias voltage of first peak value correspondence is designated as initial voltage; Described half-wave voltage and initial voltage are the bias point of double-parallel modulator; Or
According to the corresponding relation between the range value of the range value of the described signal of telecommunication and described bias voltage, scan the range value of described peak value and the pairing bias voltage of valley with second step value, calculate range value poor of described peak value and the pairing bias voltage of valley, be designated as half-wave voltage, the range value of the bias voltage of first peak value correspondence is designated as initial voltage; Described half-wave voltage and initial voltage are the bias point of double-parallel modulator.
4, the method for measurement of bias points of double-parallel modulator as claimed in claim 3 is characterized in that, described double-parallel modulator is made of the first amplitude modulation modulator, the second amplitude modulation modulator, the 3rd phase modulation modulator, and then described method also comprises:
Send first control signal to first offset controller that is connected with the first amplitude modulation modulator, the range value of controlling the bias voltage of described first offset controller output increases progressively with first step value;
The light signal that double-parallel modulator is exported under the effect of the bias voltage of described first offset controller output is converted into the signal of telecommunication;
Detect the range value of the described signal of telecommunication, when two peak values appear in the signal of telecommunication, stop to increase progressively the range value of the bias voltage of described first offset controller output;
According to the corresponding relation between the range value of the bias voltage of the range value of the described signal of telecommunication and the output of described first offset controller, scan the range value of two pairing bias voltages of peak value of the described signal of telecommunication with second step value, calculate range value poor of described two pairing bias voltages of peak value, be designated as first half-wave voltage, the range value of the bias voltage of first peak value correspondence is designated as first initial voltage; Described first half-wave voltage and first initial voltage are first bias point of double-parallel modulator, and described first step value is greater than second step value.
5, the method for measurement of bias points of double-parallel modulator as claimed in claim 4 is characterized in that, described double-parallel modulator is made of the first amplitude modulation modulator, the second amplitude modulation modulator, the 3rd phase modulation modulator, and then described method also comprises:
The bias voltage of first offset controller output that the described first amplitude modulation modulator connects is set to described first initial voltage;
Send second control signal to second offset controller that is connected with the second amplitude modulation modulator, the range value of controlling the bias voltage of described second offset controller output increases progressively with first step value;
The light signal that double-parallel modulator is exported under the effect of the bias voltage of described second offset controller output is converted into the signal of telecommunication;
Detect the range value of the described signal of telecommunication, when two peak values appear in the signal of telecommunication, stop to increase progressively the range value of the bias voltage of described second offset controller output;
According to the corresponding relation between the range value of the bias voltage of the range value of the described signal of telecommunication and the output of described second offset controller, scan the range value of two pairing bias voltages of peak value of the described signal of telecommunication with second step value, calculate range value poor of described two pairing bias voltages of peak value, be designated as second half-wave voltage, the range value of the bias voltage of first peak value correspondence is designated as second initial voltage; Described second half-wave voltage and second initial voltage are second bias point of double-parallel modulator, and described first step value is greater than second step value.
6, the method for measurement of bias points of double-parallel modulator as claimed in claim 5 is characterized in that, described double-parallel modulator is made of the first amplitude modulation modulator, the second amplitude modulation modulator, the 3rd phase modulation modulator, and then described method also comprises:
The bias voltage of second offset controller output that the described second amplitude modulation modulator connects is set to described second initial voltage;
Send the 3rd control signal to the 3rd offset controller that is connected with the 3rd amplitude modulation modulator, the range value of controlling the bias voltage of described the 3rd offset controller output increases progressively with first step value;
The light signal that double-parallel modulator is exported under the effect of the bias voltage of described the 3rd offset controller output is converted into the signal of telecommunication;
Detect the range value of the described signal of telecommunication, when a peak value and a valley appear in the signal of telecommunication, stop to increase progressively the range value of the bias voltage of described the 3rd offset controller output;
According to the corresponding relation between the range value of the bias voltage of the range value of the described signal of telecommunication and the output of described the 3rd offset controller, scan the peak value of the described signal of telecommunication and the range value of the pairing bias voltage of valley with second step value, calculate range value poor of described peak value and the pairing bias voltage of valley, be designated as the 3rd half-wave voltage, the range value of the bias voltage of described peak value correspondence is designated as the 3rd initial voltage; Described the 3rd half-wave voltage and the 3rd initial voltage are the 3rd bias point of double-parallel modulator, and described first step value is greater than second step value.
7, the method for measurement of bias points of double-parallel modulator as claimed in claim 3 is characterized in that, described double-parallel modulator is made of the first amplitude modulation modulator, the second amplitude modulation modulator, the 3rd phase modulation modulator, and then described method also comprises:
Send first control signal to first offset controller that is connected with the first amplitude modulation modulator with the 3rd offset controller that is connected with the 3rd phase modulation modulator, the range value of controlling the bias voltage of described first offset controller and the 3rd offset controller output increases progressively with first step value;
The light signal that double-parallel modulator is exported under the effect of the bias voltage of described first offset controller and the output of the 3rd offset controller is converted into the signal of telecommunication;
Detect the range value of the described signal of telecommunication, when two peak values appear in the signal of telecommunication, stop to increase progressively the range value of the bias voltage of described first offset controller and the output of the 3rd offset controller;
Write down first peak value and the second peak value correspondence coordinate (x1, y1) and (x2, y2), wherein X represents the value of the bias voltage of first offset controller output, Y represents the value of the bias voltage of the 3rd offset controller output;
According to the corresponding relation between the range value of the bias voltage of the range value of the described signal of telecommunication and described first offset controller and the output of the 3rd offset controller, scan the range value of two pairing bias voltages of peak value of the described signal of telecommunication with second step value, calculate poor (x1-x2) of the range value of the pairing first offset controller output offset voltage of described two peak values, be designated as first half-wave voltage, calculate poor (y1-y2) of the range value of pairing the 3rd offset controller output offset voltage of described two peak values, be designated as the 3rd half-wave voltage, the range value of the bias voltage of smaller's correspondence is designated as first initial voltage among x1 and the x2; The range value of the bias voltage of smaller's correspondence is designated as the 3rd initial voltage among y1 and the y2; Described first half-wave voltage and first initial voltage are first bias point of double-parallel modulator, and described the 3rd half-wave voltage and the 3rd initial voltage are the 3rd bias point of double-parallel modulator, and described first step value is greater than second step value.
8, the method for measurement of bias points of double-parallel modulator as claimed in claim 7 is characterized in that, described double-parallel modulator is made of the first amplitude modulation modulator, the second amplitude modulation modulator, the 3rd phase modulation modulator, and then described method also comprises:
The bias voltage of first offset controller output that the described first amplitude modulation modulator connects is set to described first initial voltage; The bias voltage of the 3rd offset controller output that described the 3rd phase modulation modulator connects is set to described the 3rd initial voltage;
Send second control signal to second offset controller that is connected with the second amplitude modulation modulator, the range value of controlling the bias voltage of described second offset controller output increases progressively with first step value;
The light signal that double-parallel modulator is exported under the effect of the bias voltage of described second offset controller output is converted into the signal of telecommunication;
Detect the range value of the described signal of telecommunication, when two peak values appear in the signal of telecommunication, stop to increase progressively the range value of the bias voltage of described second offset controller output;
According to the corresponding relation between the range value of the bias voltage of the range value of the described signal of telecommunication and the output of described second offset controller, scan the range value of two pairing bias voltages of peak value of the described signal of telecommunication with second step value, calculate range value poor of described two pairing bias voltages of peak value, be designated as second half-wave voltage, the range value of the bias voltage of first peak value correspondence is designated as second initial voltage; Described second half-wave voltage and second initial voltage are second bias point of double-parallel modulator, and described first step value is greater than second step value.
As the method for measurement of claim 6 or 8 described bias points of double-parallel modulator, it is characterized in that 9, described method also comprises:
With described first bias point, second bias point, the 3rd bias point stores, and is used for according to different transmission needs, the bias voltage of control action and described double-parallel modulator.
10, a kind of measuring system of bias points of double-parallel modulator is characterized in that, comprising:
Controller is used for control action and increases progressively with first step value in the range value of the bias voltage of double-parallel modulator;
Double-parallel modulator is used for exporting light signal under the effect of described bias voltage;
Testing circuit is used for the light signal that double-parallel modulator is exported under the effect of described bias voltage is converted into the signal of telecommunication; And detect the range value of the described signal of telecommunication;
When occurring satisfying the range value of the signal of telecommunication of measuring the bias point condition, described controller stops to increase progressively the range value of described bias voltage;
Described testing circuit also is used for according to the corresponding relation between the range value of the range value of the described signal of telecommunication and described bias voltage, scan the range value of the pairing bias voltage of range value of the signal of telecommunication of described satisfied measurement bias point condition with second step value, calculate bias point; Described first step value is greater than second step value.
11, the measuring system of bias points of double-parallel modulator as claimed in claim 10 is characterized in that, described double-parallel modulator comprises:
The first amplitude modulation modulator that is parallel to each other and the second amplitude modulation modulator, and the 3rd phase modulation modulator of connection and the described first amplitude modulation modulator.
12, the measuring system of bias points of double-parallel modulator as claimed in claim 11, it is characterized in that, the described first amplitude modulation modulator also is connected with first offset controller, be used for making described double-parallel modulator under the effect of described bias voltage, export light signal to the described first amplitude modulation modulator output offset voltage; The described second amplitude modulation modulator also is connected with second offset controller, is used for making described double-parallel modulator export light signal under the effect of described bias voltage to the described second amplitude modulation modulator output offset voltage; Described the 3rd phase modulation modulator also is connected with the 3rd offset controller, is used for making described double-parallel modulator export light signal under the effect of described bias voltage to described the 3rd amplitude modulation modulator output offset voltage.
13, the measuring system of the described bias points of double-parallel modulator of claim 12 is characterized in that, described controller is also stored described first bias point, second bias point, the 3rd bias point is used for according to different transmission needs, the bias voltage of control action and described double-parallel modulator.
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| CN101846814A (en) * | 2010-03-25 | 2010-09-29 | 中兴通讯股份有限公司 | Method and device for determining bias point of modulator |
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| DE10044197B4 (en) * | 2000-09-07 | 2004-08-19 | Litef Gmbh | Method and device for electro-optical measurement of electrical voltage |
| JP4608149B2 (en) * | 2001-08-10 | 2011-01-05 | 住友大阪セメント株式会社 | Method and apparatus for measuring half-wave voltage of Mach-Zehnder type optical modulator |
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