CN101621329B - 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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- CN101621329B CN101621329B CN2008100291961A CN200810029196A CN101621329B CN 101621329 B CN101621329 B CN 101621329B CN 2008100291961 A CN2008100291961 A CN 2008100291961A CN 200810029196 A CN200810029196 A CN 200810029196A CN 101621329 B CN101621329 B CN 101621329B
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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 subject to the impact of dispersion in optical fiber, so-called dispersion is exactly the wave distortion that the various mode component transmission speed differences of the different frequency component of institute's signal transmission in the optical fiber or signal cause signal, the dispersion major effect that transmission brings to light is to make to produce intersymbol interference between data pulse, the damage that dispersion brings systematic function be can not ignore, and the general fiber optic transmission system of transmission rate more than 10Gbit/s all needs dispersion compensation technology to guarantee the transfer function of system.
Now 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).Although this dispersion compensation mode is easy to use, but also defectiveness, be that volume is larger, 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, although very practical in the optical transmission system of point-to-point, but when being applied in the flexible network of the complicated network that the wavelength up/down is arranged, especially dynamic reconfigurable, because the transmission path of light compensation process is different, the dispersion of experiencing 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, and so-called electric territory dispersion compensation refers in optical transmission system transmitter module or receiver module partially or completely deteriorated to signal transmission of compensation of dispersion of the mode processed by electric territory signal.Carry out the square examination that electric territory dispersion post-compensation mainly is subject to photodetector at receiving terminal, so its compensation ability is limited, carry out the dispersion compensation ability that electric territory dispersion pre-compensation then has long distance at transmitting terminal.
Transmitting terminal dispersion pre-compensation mode can realize the compensation of thousands of kilometers transmission ranges, but must receive near predetermined complementary range.If so that transmission range changes, launching dynamo-electric territory also needs to change the parameter of digital processing and the parameter of transmitter hardware owing to the reason such as wavelength route.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-modulating modulation devices as, i.e. Mach-Ze De modulator (MZM, Mach-zender Modulator) forms such 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 the data-signal of transmission through after the precoding processing, obtain two paths of data and be respectively Iin and Qin.The light of light source output is divided into up and down, and two-way outputs to respectively described up and down two MZM modulators, Iin and Qin modulate each road light and obtain differential phase keying (DPSK) code (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 to any bias point of described DPMZ modulator be regulated, thereby must measure the initial voltage V0 of DPMZ modulator and half-wave voltage Vpi and Vpi '.
The initial voltage V0 of DPMZ modulator and half-wave voltage Vpi be as shown in Figure 2:
Among Fig. 2, V0 is the magnitude of voltage corresponding to first luminous power peak value of modulator, and for MZM1 and MZM2, Vpi is poor from peak value to magnitude of voltage corresponding to adjacent peak dot, for the phase modulation modulator, Vpi is that peak value arrives the poor of magnitude of voltage corresponding to adjacent valley point.
Prior art provides a kind of bias point of the DPMZ of making modulator stable method, as shown in Figure 3:
In the method, adopt 3 scrambling frequency f 1, f2 and f3, consist of respectively three loops 15.1,15.2,15.3, 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 to possess the detection peak ability just can detect, and such PD device is very expensive.
The inventor finds in implementing process of the present invention, and there are the following problems for prior art:
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, and cost is expensive.
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 the 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, the range value with the corresponding bias voltage of range value of the signal of telecommunication of the described satisfied measurement bias point condition of the second stepping scan value calculates bias point; Described the first step value is greater than the 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 the first step value in the range value of the bias voltage of double-parallel modulator;
Double-parallel modulator is used for output optical signal under the effect of described bias voltage;
Testing circuit, the light signal that is used for 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, range value with the corresponding bias voltage of range value of the signal of telecommunication of the described satisfied measurement bias point condition of the second stepping scan value calculates bias point; Described the first step value is greater than the 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 forms.
At first explanation is, the bias point of so-called double-parallel modulator, be actually two 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 namely measuring the work of MZM modulator in double-parallel modulator and phase modulation modulator stable, initial voltage and the half-wave voltage of the offset controller that two MZM modulators and phase modulation modulator connect separately.
Biasing T10 is used for connecting 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, the data-signal that superposes with bias voltage is that this is that those skilled in the art is known through the data-signal of the needs transmission of precoding processing, 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) form, 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 upper 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, controller 2, offset controller 3 (BC3), and testing circuit 4 compositions, wherein testing circuit 4 is again by optical splitter 40, and PD manages 41, the amplifier 42 that amplitude is adjustable, filter 43, analog to digital converter 44 (ADC44) consists of.
Need to prove, the biasing T of described double-parallel modulator 1 has two, and 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 the 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 under the effect of described bias voltage by offset controller 30 input, output optical signal;
At this moment, corresponding described the first initial voltage and the first half-wave voltage of controller 2 these testing results of storage, the value of the bias voltage of the output of described offset controller 30 is set to described the first initial voltage, and export the second control signal to offset controller 31, described offset controller 31 is under the control of the 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 under the effect of described bias voltage by offset controller 31 input, output optical signal;
At this moment, corresponding described the second initial voltage and the second half-wave voltage of controller 2 these testing results of storage, the value of the output offset voltage of described offset controller 31 is set to described the second initial voltage, and export the 3rd control signal to offset controller 32, described offset controller 32 is under the control of the second control signal, and output offset voltage is to the port one 12 (port112) of DPMZ1;
Described DPMZ1 under the effect of described biased electrical by offset controller 32 input, output optical signal;
At this moment, corresponding described the 3rd initial voltage and the 3rd half-wave voltage of controller 2 these testing results of storage.
The 3rd initial voltage of the second initial voltage of the first initial voltage of offset controller 30 and the first half-wave voltage, offset controller 31 and the 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.
The below describes the function and structure of testing circuit 4 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 the 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 the first control signal is to offset controller 30, under the control of the 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 larger step value (for example interval 0.5V) 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 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 that first peak value and second peak value is corresponding is designated as the first half-wave voltage, and the value of the bias voltage that first peak value is corresponding is designated as the first initial voltage;
Then, the value of offset controller 30 output offset voltages is set to described the first initial voltage, controller 2 is again to offset controller 31 outputs the second control signal, under the control of the 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 larger step value (for example interval 0.5V) 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 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 that first peak value and second peak value is corresponding is designated as the second half-wave voltage, and the value of the bias voltage that first peak value is corresponding is designated as the second initial voltage;
Then, the value of offset controller 31 output offset voltages is set to described the 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 larger step value (for example interval 0.5V) 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 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 the peak value that detects two adjacent signals of telecommunication and valley, the difference of the bias voltage that described peak value and valley is corresponding is designated as the 3rd half-wave voltage, and the value of the bias voltage that described peak value is corresponding is designated as the 3rd initial voltage;
The 3rd initial voltage of the second initial voltage of the first initial voltage of offset controller 30 and the first half-wave voltage, offset controller 31 and the 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 larger step value (for example interval 0.5V) 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 smaller among both the first initial voltage value of offset controller 30 correspondences, 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 the 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 described the 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 larger step value (for example interval 0.5V) for 4 of testing circuits;
The 3rd initial voltage of the second initial voltage of the first initial voltage of offset controller 30 and the first half-wave voltage, offset controller 31 and the 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 the 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, 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, range value with described two the corresponding bias voltages of peak value of the second stepping scan value, calculate range value poor of described two corresponding bias voltages of peak value, be designated as half-wave voltage, the range value of the bias voltage that first peak value is corresponding 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, range value with the described peak value of the second stepping scan value and the corresponding bias voltage of valley, calculate range value poor of described peak value and the corresponding bias voltage of valley, be designated as half-wave voltage, the range value of the bias voltage that first peak value is corresponding 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 the 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-modulating modulation device, the second amplitude-modulating modulation device, the 3rd phase modulation modulator, and the method for measurement of described bias points of double-parallel modulator then comprises:
Step 200 is sent the first control signal to the first offset controller that is connected with the first amplitude-modulating modulation device, and the range value of controlling the bias voltage of described the first offset controller output increases progressively with the 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 the first offset controller output;
Step 205 is sent the second control signal to the second offset controller that is connected with the second amplitude-modulating modulation device, and the range value of controlling the bias voltage of described the second offset controller output increases progressively with the 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 the second offset controller output;
Step 210 is sent the 3rd control signal to the 3rd offset controller that is connected with the 3rd amplitude-modulating modulation device, and the range value of controlling the bias voltage of described the 3rd offset controller output increases progressively with the 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 to adopt the PD of cheap low speed that the signal of telecommunication is detected, calculate 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-modulating modulation device, the second amplitude-modulating modulation device, the 3rd phase modulation modulator, and the method for measurement of described bias points of double-parallel modulator then comprises:
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 the first offset controller and the output of the 3rd offset controller;
Step 303 records the first peak value and the second peak value corresponding coordinate (x1, y1) and (x2, y2), and wherein X represents the value of the bias voltage of the first offset controller output, and Y represents the value of the bias voltage of the 3rd offset controller output;
Step 306 is sent the second control signal to the second offset controller that is connected with the second amplitude-modulating modulation device, and the range value of controlling the bias voltage of described the second offset controller output increases progressively with the first step value;
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 the second offset controller output;
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 to adopt the PD of cheap low speed that the signal of telecommunication is detected, calculate 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, technical scheme of the present invention is to can embodying with the form of software product in whole or in part that background technology contributes, this computer software product can be stored in the storage medium, such as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be 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, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (8)
1. the method for measurement of a bias points of double-parallel modulator is characterized in that, comprising:
Control action increases progressively with the 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, the range value with the corresponding bias voltage of range value of the signal of telecommunication of the described satisfied measurement bias point condition of the second stepping scan value calculates bias point; Described the first step value is greater than the second step value;
Wherein, described double-parallel modulator comprises the first amplitude-modulating modulation device and the second amplitude-modulating modulation device that is parallel to each other, and the 3rd phase modulation modulator that is connected in described the first amplitude-modulating modulation device, and then described method also comprises:
Send the first control signal to the first offset controller that is connected with the first amplitude-modulating modulation device, the range value of controlling the bias voltage of described the first offset controller output increases progressively with the first step value;
The light signal that double-parallel modulator is exported under the effect of the bias voltage of described the 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 the 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 the first offset controller, range value with two corresponding bias voltages of peak value of the described signal of telecommunication of the second stepping scan value, calculate range value poor of described two corresponding bias voltages of peak value, be designated as the first half-wave voltage, the range value of the bias voltage that first peak value is corresponding is designated as the first initial voltage; Described the first half-wave voltage and the first initial voltage are the first bias point of double-parallel modulator, and described the first step value is greater than the 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 method also comprises:
The bias voltage of the first offset controller output that described the first amplitude-modulating modulation device connects is set to described the first initial voltage;
Send the second control signal to the second offset controller that is connected with the second amplitude-modulating modulation device, the range value of controlling the bias voltage of described the second offset controller output increases progressively with the first step value;
The light signal that double-parallel modulator is exported under the effect of the bias voltage of described the 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 the 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 the second offset controller, range value with two corresponding bias voltages of peak value of the described signal of telecommunication of the second stepping scan value, calculate range value poor of described two corresponding bias voltages of peak value, be designated as the second half-wave voltage, the range value of the bias voltage that first peak value is corresponding is designated as the second initial voltage; Described the second half-wave voltage and the second initial voltage are the second bias point of double-parallel modulator, and described the first step value is greater than the second step value.
3. the method for measurement of bias points of double-parallel modulator as claimed in claim 2 is characterized in that, described method also comprises:
The bias voltage of the second offset controller output that described the second amplitude-modulating modulation device connects is set to described the second initial voltage;
Send the 3rd control signal to the 3rd offset controller that is connected with the 3rd phase modulation modulator, the range value of controlling the bias voltage of described the 3rd offset controller output increases progressively with the 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, with the peak value of the described signal of telecommunication of the second stepping scan value and the range value of the corresponding bias voltage of valley, calculate range value poor of described peak value and the corresponding bias voltage of valley, be designated as the 3rd half-wave voltage, the range value of the bias voltage that described peak value is corresponding 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 the first step value is greater than the second step value.
4. the method for measurement of bias points of double-parallel modulator as claimed in claim 3 is characterized in that, described method also comprises:
Described the first bias point, the second bias point and the 3rd bias point are stored, be used for according to different transmission needs, the bias voltage of control action and described double-parallel modulator.
5. the method for measurement of a bias points of double-parallel modulator is characterized in that, comprising:
Control action increases progressively with the 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, the range value with the corresponding bias voltage of range value of the signal of telecommunication of the described satisfied measurement bias point condition of the second stepping scan value calculates bias point; Described the first step value is greater than the second step value;
Wherein, described double-parallel modulator comprises the first amplitude-modulating modulation device and the second amplitude-modulating modulation device that is parallel to each other, and the 3rd phase modulation modulator that is connected in described the first amplitude-modulating modulation device, and described method also comprises:
Send the first control signal to the first offset controller that is connected with the first amplitude-modulating modulation device with the 3rd offset controller that is connected with the 3rd phase modulation modulator, the range value of controlling the bias voltage of described the first offset controller and the 3rd offset controller output increases progressively with the first step value;
The light signal that double-parallel modulator is exported under the effect of the bias voltage of described the 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 the first offset controller and the output of the 3rd offset controller;
Record the first peak value and the second peak value corresponding coordinate (x1, y1) and (x2, y2), wherein x represents the value of the bias voltage of the first offset controller output, and 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 the first offset controller and the output of the 3rd offset controller, range value with two corresponding bias voltages of peak value of the described signal of telecommunication of the second stepping scan value, calculate poor (x1-x2) of the range value of corresponding the first offset controller output offset voltage of described two peak values, be designated as the first half-wave voltage, calculate poor (y1-y2) of the range value of corresponding the 3rd offset controller output offset voltage of described two peak values, be designated as the 3rd half-wave voltage, the range value of bias voltage corresponding to smaller is designated as the first initial voltage among x1 and the x2; The range value of bias voltage corresponding to smaller is designated as the 3rd initial voltage among y1 and the y2; Described the first half-wave voltage and the first initial voltage are the 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 the first step value is greater than the 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 method also comprises:
The bias voltage of the first offset controller output that described the first amplitude-modulating modulation device connects is set to described the 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 the second control signal to the second offset controller that is connected with the second amplitude-modulating modulation device, the range value of controlling the bias voltage of described the second offset controller output increases progressively with the first step value;
The light signal that double-parallel modulator is exported under the effect of the bias voltage of described the 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 the 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 the second offset controller, range value with two corresponding bias voltages of peak value of the described signal of telecommunication of the second stepping scan value, calculate range value poor of described two corresponding bias voltages of peak value, be designated as the second half-wave voltage, the range value of the bias voltage that first peak value is corresponding is designated as the second initial voltage; Described the second half-wave voltage and the second initial voltage are the second bias point of double-parallel modulator, and described the first step value is greater than the second step value.
7. the method for measurement of bias points of double-parallel modulator as claimed in claim 6 is characterized in that, described method also comprises:
Described the first bias point, the second bias point and the 3rd bias point are stored, be used for according to different transmission needs, the bias voltage of control action and described double-parallel modulator.
8. the measuring system of a bias points of double-parallel modulator is characterized in that, comprising:
Controller is used for control action and increases progressively with the first step value in the range value of the bias voltage of double-parallel modulator;
Double-parallel modulator is used for output optical signal under the effect of described bias voltage, comprises the first amplitude-modulating modulation device and the second amplitude-modulating modulation device that are parallel to each other, and the 3rd phase modulation modulator that is connected in described the first amplitude-modulating modulation device;
Testing circuit, the light signal that is used for 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, range value with the corresponding bias voltage of range value of the signal of telecommunication of the described satisfied measurement bias point condition of the second stepping scan value calculates bias point; Described the first step value is greater than the second step value;
Wherein, described the first amplitude-modulating modulation device also is connected with the first offset controller, is used for exporting the first bias voltage to described the first amplitude-modulating modulation device, makes described double-parallel modulator output optical signal under the effect of described the first bias voltage; Described the second amplitude-modulating modulation device also is connected with the second offset controller, is used for exporting the second bias voltage to described the second amplitude-modulating modulation device, makes described double-parallel modulator output optical signal under the effect of described the second bias voltage; Described the 3rd phase modulation modulator also is connected with the 3rd offset controller, is used for exporting the 3rd bias voltage to described the 3rd phase modulation modulator, makes described double-parallel modulator output optical signal under the effect of described the 3rd bias voltage.
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| CN102662253B (en) * | 2012-04-16 | 2015-01-14 | 南京航空航天大学 | Double-parallel electro-optic modulator and application method thereof |
| US9654226B1 (en) * | 2015-12-19 | 2017-05-16 | Finisar Corporation | Method and apparatus for characterization and compensation of optical impairments in InP-based optical transmitter |
| CN112445040A (en) * | 2016-02-23 | 2021-03-05 | 日本电信电话株式会社 | Optical transmitter |
| CN109714107A (en) * | 2019-03-07 | 2019-05-03 | 西安电子科技大学 | Microwave light dispersion compensation method based on PDM-DPMZM chain-circuit system |
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| EP1186896B1 (en) * | 2000-09-07 | 2006-01-18 | LITEF GmbH | Electro-optical method and apparatus for measuring an electrical voltage |
| CN101046411A (en) * | 2007-04-19 | 2007-10-03 | 浙江大学 | Electrooptical phase regulation coefficient measing method for electrooptical phase regulator |
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