CN104243022A - Light vector network analyzer and using method thereof - Google Patents

Abstract

The invention provides a light vector network analyzer and a using method of the light vector network analyzer. The light vector network analyzer comprises a laser device (1), a first polarization coupler (2), a radio frequency source (3), an intensity modulator (4), a second polarization coupler (5), a polarization-maintaining high-pass optical filter (6), a second polarization controller (7), a third polarization coupler (8), a to-be-tested unit (9), a polarization-maintaining low-pass optical filter (10), a fourth polarization coupler (11), a first polarization controller (12), a fifth polarization coupler (13), a sixth polarization coupler (14), a polarization beam splitter (15), a first photoelectric detector (16), a first electric filtering unit (17), a second photoelectric detector (18), a second electric filtering unit (19) and a signal processing unit (20). According to the light vector network analyzer and the using method of the light vector network analyzer, the requirement for the laser device is reduced, and the measurement accuracy can be adjusted conveniently.

Description

Light vector network analyzer and using method thereof

Technical field

The present invention relates to technical field of photo communication, particularly relate to a kind of light vector network analyzer and using method thereof.

Background technology

The world today enters the information age, and information technology has become affects a national science and technology level, the economic level even key factor of overall national strength.Due to the growth of the Internet geometry explosion type, optical communication technique is a very important part in ICT (information and communication technology).And optical gauge is a kind of instrument indispensable in optical communication technique, light vector network analyzer becomes one of survey tool of optical device and optical communication system with the comprehensive of its measurement result.

Light vector network analyzer is the instrument that contemporary optics network equipment medium velocity is the fastest, most economical, the most accurately measure loss, dispersion and polarization relevant parameter.The scope of test products covers all devices in from the optical fiber connector to fused fiber splice, as grating, spatial light filter, adjustable device, amplifier etc.Light vector network analyzer of the prior art, must adopt expensive frequency swept laser to obtain device under test transmission matrix and the performance at different frequency place at transmitting terminal.Light vector network analyzer of the prior art is based on thin step-length frequency swept laser, in each center frequency points measured within the scope of lower limiting frequency, by laser sweep and the optical fiber delay adjustment of continuous thin step-length, realize the measurement of this Frequency point place transmission matrix and the adjustment of certainty of measurement, light vector network analyzer of the prior art higher to the requirement of laser, complicated operation.

Summary of the invention

The invention provides a kind of light vector network analyzer and using method thereof, reduce the requirement to laser.

First aspect, the invention provides a kind of light vector network analyzer, comprising:

Laser (1), the first polarizing coupler (2), the second Polarization Controller (7), the 3rd polarizing coupler (8), to-be-measured cell (9), the 6th polarizing coupler (14), polarization beam apparatus (15) connect successively;

Described first polarizing coupler (2), intensity modulator (4), the second polarizing coupler (5), protect inclined high-pass optical filter (6), described 3rd polarizing coupler (8) connects successively, wherein, described intensity modulator (4) is connected with radio frequency source (3);

Described second polarizing coupler (5), protect logical optical filter (10) on the low side, the 4th polarizing coupler (11), the 5th polarizing coupler (13), described 6th polarizing coupler (14) connect successively;

Described 4th polarizing coupler (11), the first Polarization Controller (12), described 5th polarizing coupler (13) connect successively;

Described polarization beam apparatus (15), the first photoelectric detector (16), the first electric filter unit (17), signal processing unit (20) connect successively;

Described polarization beam apparatus (15), the second photoelectric detector (18), the second electric filter unit (19), described signal processing unit (20) connect successively;

The centre frequency of described laser (1) can regulate;

Described signal processing unit (20), for obtaining the output signal of described first electric filter unit (17) and described second electric filter unit (19) respectively, and obtain the transmission matrix of described to-be-measured cell (9) according to described output signal.

Further, the splitting ratio of described first polarizing coupler (2) is 1:1.

Further, the transmission matrix of described first Polarization Controller (12) is $\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right].$

Further, the transmission matrix of described second Polarization Controller (7) is $\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right].$

Further, the span of the cut-off frequency of the inclined high-pass optical filter of described guarantor (6) is (ω _c-ω ₀, ω _c+ ω ₀), described ω _cfor the centre frequency of described laser (1), described ω ₀for the frequency of described radio frequency source (3).

Further, the span of the cut-off frequency of described guarantor logical optical filter (10) on the low side is (ω _c-ω ₀, ω _c+ ω ₀), described ω _cfor the centre frequency of described laser (1), described ω ₀for the frequency of described radio frequency source (3).

Further, described first electric filter unit (17) comprising: the first low pass electrical filter, the first band energising filter;

The span of the cut-off frequency of described first low pass electrical filter is (ω ₀, 2 ω ₀);

The span of the lower limiting frequency of described first band energising filter is (ω ₀, 2 ω ₀);

The span of the upper cut off frequency of described first band energising filter is (2 ω ₀, ω _c-ω ₀);

Wherein, described ω _cfor the centre frequency of described laser (1), described ω ₀for the frequency of described radio frequency source (3).

Further, described second electric filter unit (19) comprising: the second low pass electrical filter, the second band energising filter;

The span of the cut-off frequency of described second low pass electrical filter is (ω ₀, 2 ω ₀);

The span of the lower limiting frequency of described second band energising filter is (ω ₀, 2 ω ₀);

The span of the upper cut off frequency of described second band energising filter is (2 ω ₀, ω _c-ω ₀);

Wherein, described ω _cfor the centre frequency of described laser (1), described ω ₀for the frequency of described radio frequency source (3).

Second aspect, the invention provides the using method of arbitrary described light vector network analyzer in a kind of first aspect, comprising:

The frequency of described radio frequency source (3) is regulated according to the requirement of certainty of measurement;

According to the centre frequency of laser (1) described in the frequency adjustment that described to-be-measured cell (9) will be measured.

Further, the centre frequency of laser (1) described in the described frequency adjustment will measured according to described to-be-measured cell (9), comprising:

The centre frequency of laser (1) described in the described frequency adjustment will measured according to described to-be-measured cell (9), the frequency making described centre frequency equal described to-be-measured cell (9) will to measure.

The invention provides a kind of light vector network analyzer and using method thereof, without the need to carrying out laser frequency sweep operation, only needing laser to change centre frequency, reducing the requirement to laser, and certainty of measurement can be regulated easily.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the structural representation of a kind of light vector network analyzer that one embodiment of the invention provides;

Fig. 2 is the Signal transmissions schematic diagram of a kind of light vector network analyzer that one embodiment of the invention provides;

Fig. 3 is the using method flow chart of a kind of light vector network analyzer that one embodiment of the invention provides.

Embodiment

For making the object of the embodiment of the present invention, technical scheme and advantage clearly; below in conjunction with the accompanying drawing in the embodiment of the present invention; technical scheme in the embodiment of the present invention is clearly and completely described; obviously; described embodiment is the present invention's part embodiment, instead of whole embodiments, based on the embodiment in the present invention; the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.

Embodiments provide a kind of light vector network analyzer, see Fig. 1, comprising:

Laser 1, first polarizing coupler 2, second Polarization Controller 7, the 3rd polarizing coupler 8, to-be-measured cell 9, the 6th polarizing coupler 14, polarization beam apparatus 15 connect successively;

Described first polarizing coupler 2, intensity modulator 4, second polarizing coupler 5, protect inclined high-pass optical filter 6, described 3rd polarizing coupler 8 connects successively, wherein, described intensity modulator 4 is connected with radio frequency source 3;

Described second polarizing coupler 5, protect logical optical filter 10 on the low side, the 4th polarizing coupler 11, the 5th polarizing coupler 13, described 6th polarizing coupler 14 connect successively;

Described 4th polarizing coupler 11, first Polarization Controller 12, described 5th polarizing coupler 13 connect successively;

The electric filter unit 17 of described polarization beam apparatus 15, first photoelectric detector 16, first, signal processing unit 20 connect successively;

The electric filter unit 19 of described polarization beam apparatus 15, second photoelectric detector 18, second, described signal processing unit 20 connect successively;

The centre frequency of described laser 1 can regulate;

Described signal processing unit 20, for obtaining the output signal of described first electric filter unit 17 and described second electric filter unit 19 respectively, and obtains the transmission matrix of described to-be-measured cell 9 according to described output signal.

The light vector network analyzer that the present embodiment provides is in measured central frequency range, without the need to carrying out laser frequency sweep operation, only adopt radio frequency source and intensity modulator can realize the measurement of this Frequency point place transmission matrix and the dynamic conditioning of certainty of measurement, operate more flexible.The light vector network analyzer that the present embodiment provides is very low to the requirement of laser, only needs laser to change centre frequency.

Wherein, the effect of the first polarizing coupler 2 is that the light signal that laser 1 sends is divided into two light signals, and one of them light signal is as the input of the second Polarization Controller 7, and another light signal is as the input of intensity modulator 4.Alternatively, the splitting ratio of the first polarizing coupler 2 is 1:1.

The effect of the second Polarization Controller 7 is rotated the polarization state of the light signal of input, make the polarization state of the light signal of output orthogonal with the polarization state of the light signal of input, particularly, the polarization state of the light signal exported by the first polarizing coupler 2 rotates, and the light signal exported after rotating is as the input of the 3rd polarizing coupler 8.Wherein, the transmission matrix of described second Polarization Controller 7 is $\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right].$

The effect of the 3rd polarizing coupler 8 is that two optical signal of input are become a light signal, particularly, the optical signal that the light signal exported by second Polarization Controller 7 exports with the inclined high-pass optical filter 6 of guarantor becomes a light signal, and the light signal after coupling is as the input of to-be-measured cell 9.

To-be-measured cell 9 can be optical device or optical communication system.The light signal that to-be-measured cell 9 exports is as the input of the 6th polarizing coupler 14.

The effect of the 6th polarizing coupler 14 is that two optical signal of input are become a light signal, particularly, the optical signal that the light signal exported by to-be-measured cell 9 and the 5th polarizing coupler 13 export becomes a light signal, and the light signal after coupling is as the input of polarization beam apparatus 15.

The effect of intensity modulator 4 is that the light signal of signal to input sent according to radio frequency source 3 is modulated.Wherein, alternatively, the signal that radio frequency source 3 sends is sinusoidal signal form, and amplitude is 1.If desired draw the transmission matrix of to-be-measured cell more accurately, then suitably can reduce the frequency of radio frequency source 3, realize the flexible adjustment of certainty of measurement with this.

The effect of the second polarizing coupler 5 is that a light signal of input is divided into two light signals, particularly, the light signal that intensity modulator 4 exports is divided into two light signals, one of them light signal is as the input protecting inclined high-pass optical filter 6, and another light signal is as the input protecting logical optical filter 10 on the low side.

The effect protecting inclined high-pass optical filter 6 carries out filtering to the light signal of input, protects the input of the light signal after the process of inclined high-pass optical filter 6 as the 3rd polarizing coupler 8.Wherein, the span of the cut-off frequency of inclined high-pass optical filter 6 is protected for (ω _c-ω ₀, ω _c+ ω ₀), described ω _cfor the centre frequency of described laser 1, described ω ₀for the frequency of described radio frequency source 3.Preferably, the cut-off frequency protecting inclined high-pass optical filter 6 is ω _c, light signal only has frequency to be greater than ω after the inclined high-pass optical filter 6 of this guarantor _cfrequency component be retained.

The effect protecting logical optical filter 10 on the low side carries out filtering to the light signal of input, protects the input of the light signal after logical optical filter 10 on the low side process as the 4th polarizing coupler 11.The span of the cut-off frequency of described guarantor is on the low side logical optical filter 10 is (ω _c-ω ₀, ω _c+ ω ₀), described ω _cfor the centre frequency of described laser 1, described ω ₀for the frequency of described radio frequency source 3.Preferably, the cut-off frequency protecting logical optical filter 10 on the low side is ω _c, light signal only has frequency to be less than ω after this guarantor logical optical filter 10 on the low side _cfrequency component be retained.

The effect of the 4th polarizing coupler 11 is that a light signal of input is divided into two light signals, particularly, the light signal that guarantor's logical optical filter 10 on the low side exports is divided into two light signals, one of them light signal is as the input of the first Polarization Controller 12, and another light signal is as the input of the 5th polarizing coupler 13.

The effect of the first Polarization Controller 12 is rotated the polarization state of the light signal of input, make the polarization state of the light signal of output orthogonal with the polarization state of the light signal of input, particularly, the polarization state of the light signal exported by the 4th polarizing coupler 11 rotates, and the light signal exported after rotating is as the input of the 5th polarizing coupler 13.Wherein, the transmission matrix of described first Polarization Controller 7 is $\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right].$

The effect of the 5th polarizing coupler 13 is that two optical signal of input are become a light signal, particularly, the optical signal that the light signal exported by first Polarization Controller 12 and the 4th polarizing coupler 11 export becomes a light signal, and the light signal after coupling is as the input of the 6th polarizing coupler 14.

The effect of polarization beam apparatus 15 is that the light signal of input is divided into two light signals, particularly, the light signal that 6th polarizing coupler 14 exports is divided into two light signals, one of them light signal is as the input of the first photoelectric detector 16, and another light signal is as the input of the second photoelectric detector 18.

The effect of the first photoelectric detector 16 is that the light signal of input is converted to the signal of telecommunication, particularly, converts the light signal that polarization beam apparatus 15 exports to the signal of telecommunication, and this signal of telecommunication is as the input of the first electric filter unit 17.

The effect of the first electric filter unit 17 carries out filtering to the signal of telecommunication of input.Described first electric filter unit 17 comprises: the first low pass electrical filter, the first band energising filter; The span of the cut-off frequency of described first low pass electrical filter is (ω ₀, 2 ω ₀); The span of the lower limiting frequency of described first band energising filter is (ω ₀, 2 ω ₀); The span of the upper cut off frequency of described first band energising filter is (2 ω ₀, ω _c-ω ₀); Wherein, ω _cfor the centre frequency of described laser 1, ω ₀for the frequency of described radio frequency source 3.

The effect of the second photoelectric detector 18 is that the light signal of input is converted to the signal of telecommunication, particularly, converts the light signal that polarization beam apparatus 15 exports to the signal of telecommunication, and this signal of telecommunication is as the input of the second electric filter unit 19.

The effect of the second electric filter unit 19 carries out filtering to the signal of telecommunication of input.Second electric filter unit 19 comprises: the second low pass electrical filter, the second band energising filter; The span of the cut-off frequency of described second low pass electrical filter is (ω ₀, 2 ω ₀); The span of the lower limiting frequency of described second band energising filter is (ω ₀, 2 ω ₀); The span of the upper cut off frequency of described second band energising filter is (2 ω ₀, ω _c-ω ₀); Wherein, ω _cfor the centre frequency of described laser 1, ω ₀for the frequency of described radio frequency source 3.

Fig. 2 shows a kind of Signal transmissions schematic diagram of light vector network analyzer.Wherein, be ω when to-be-measured cell 2-9 will be measured in frequency _cduring the performance located, the transmission matrix of to-be-measured cell 2-9 is set to: $T\left({\mathrm{\ω}}_c\right)=\left[\begin{array}{cc}{T}_{\mathrm{xx}}\left({\mathrm{\ω}}_c\right)& T_{\mathrm{xy}}\left({\mathrm{\ω}}_c\right)\\ Y_{\mathrm{yx}}\left({\mathrm{\ω}}_x\right)& T_{\mathrm{yy}}\left({\mathrm{\ω}}_c\right)\end{array}\right];$ The centre frequency of laser 2-1 is ω _c, complex amplitude is A; The frequency of radio frequency source 2-3 is ω ₀, amplitude is 1; The splitting ratio of the first polarizing coupler 2-2 is 1:1, and the splitting ratio of the second polarizing coupler 2-5 is 1:1, and the splitting ratio of the 4th polarizing coupler 2-11 is 1:1, the transmission matrix of the first Polarization Controller 2-12 $P_1=\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right],$ The transmission matrix of the second Polarization Controller 2-7 $P_2=\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right],$ The cut-off frequency protecting inclined high-pass optical filter 2-6 is ω _c, the cut-off frequency protecting logical optical filter 2-10 on the low side is ω _c, the responsiveness of the first photoelectric detector 2-16 and the second photoelectric detector 2-18 is R.

The light field of the light signal that laser 2-1 sends is: $E_1=\left[\begin{array}{c}A\×e^{-i{\mathrm{\ω}}_{c}t}\\ 0\end{array}\right];$

The light signal that laser 2-1 sends is become two light signals by the first polarizing coupler 2-2, and the light field as the light signal of the second Polarization Controller 2-7 input is: $E_2=\frac{A}{\sqrt{2}}\×\left[\begin{array}{c}{e}^{-i{\mathrm{\ω}}_{c}t}\\ 0\end{array}\right];$ Light field as the light signal of intensity modulator 2-4 input is: $E_3=\frac{A}{\sqrt{2}}\×\left[\begin{array}{c}{e}^{-i{\mathrm{\ω}}_{c}t}\\ 0\end{array}\right];$

The light field of the light signal that the second Polarization Controller 2-7 exports is:

$E_7=P_2\·E_2=\frac{A}{\sqrt{2}}\×\left[\begin{array}{c}0\\ -e^{-i{\mathrm{\ω}}_{c}t}\end{array}\right];$

The light field of the light signal after intensity modulator 2-4 modulation is:

$E_4=\frac{A}{2\sqrt{2}}\×\left[\begin{array}{c}{e}^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}+e^{-i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}\\ 0\end{array}\right];$

Light field is E ₄light signal by becoming two light signals after the second polarizing coupler 2-5, the light field as the light signal protecting inclined high-pass optical filter 2-6 input is:

$E_5=\frac{A}{4}\×\left[\begin{array}{c}{e}^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}+e^{-i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}\\ 0\end{array}\right];$

As the light field of protecting the light signal that logical optical filter 2-10 on the low side inputs be:

$E_{10}=\frac{A}{4}\×\left[\begin{array}{c}{e}^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}+e^{-i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}\\ 0\end{array}\right];$

The light field of protecting the light signal that inclined high-pass optical filter 2-6 exports is:

$E_6=\frac{A}{4}\×\left[\begin{array}{c}{e}^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}\\ 0\end{array}\right];$

After entering the 3rd polarizing coupler 2-8, light field is E ₆light signal and light field be E ₇optical signal become a light signal, the light field of light signal that the 3rd polarizing coupler 2-8 exports is:

$E_8=\frac{A}{4}\×\left[\begin{array}{c}{e}^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}\\ -2\sqrt{2}{e}^{-i{\mathrm{\ω}}_{c}t}\end{array}\right];$

Light field is E ₈light signal input to-be-measured cell 2-9 after, the light field of the light signal that to-be-measured cell 2-9 exports is:

$E_9=T\left({\mathrm{\ω}}_c\right)\·E_8=\frac{A}{4}\×\left[\begin{array}{c}{T}_{\mathrm{xx}}\left({\mathrm{\ω}}_c\right)\×e^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}-2\sqrt{2}{T}_{\mathrm{xy}}\left({\mathrm{\ω}}_c\right)\×e^{-i{\mathrm{\ω}}_{c}t}\\ T_{\mathrm{yx}}\left({\mathrm{\ω}}_c\right)\×e^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}-e\sqrt{e}{T}_{\mathrm{yy}}\left({\mathrm{\ω}}_c\right)\×e^{-i{\mathrm{\ω}}_{c}t}\end{array}\right]$

The light field of protecting the light signal that inclined high-pass optical filter 2-6 exports is:

$E_{11}=\frac{A}{4}\×\left[\begin{array}{c}{e}^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}\\ 0\end{array}\right];$

Light field is E ₁₁light signal enter the 4th polarizing coupler 2-11 after become two light signals, the light field of light signal inputted as the first Polarization Controller 2-12 is:

$E_{12}=\frac{A}{4\sqrt{2}}\×\left[\begin{array}{c}{e}^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}\\ 0\end{array}\right],$

Light field as the light of the 5th polarizing coupler 2-13 input is:

$E_{14}=\frac{A}{4\sqrt{2}}\×\left[\begin{array}{c}{e}^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}\\ 0\end{array}\right];$

The light field of the light signal that the first Polarization Controller 2-12 exports is:

$E_{13}=P_1\·E_{12}=\frac{A}{4\sqrt{2}}\×\left[\begin{array}{c}0\\ -e^{-i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}\end{array}\right];$

The light field inputting the 5th polarizing coupler 2-13 is E ₁₃light signal and light field be E ₁₄optical signal become a light signal, the light field of light signal that the 5th polarizing coupler 2-13 exports is:

$E_{15}=\frac{A}{4\sqrt{2}}\×\left[\begin{array}{c}{e}^{-i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}\\ {-e}^{-i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}\end{array}\right];$

The light field inputting the 6th polarizing coupler 2-14 is E ₉light signal and light field be E ₁₅optical signal become a light signal, the light field of light signal that the 6th polarizing coupler 2-14 exports is:

$\begin{array}{c}{E}_{16}=\\ \frac{A}{4}\×\left[\begin{array}{c}{T}_{\mathrm{xx}}\left({\mathrm{\ω}}_c\right)\×e^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}-T_{\mathrm{xy}}\left({\mathrm{\ω}}_c\right)\×e^{-i{\mathrm{\ω}}_{c}t}+\frac{1}{\sqrt{2}}{e}^{-i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}\\ T_{\mathrm{yx}}\left({\mathrm{\ω}}_c\right)\×e^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}-2\sqrt{2}{T}_{\mathrm{yy}}\left({\mathrm{\ω}}_c\right)\×e^{-i{\mathrm{\ω}}_{c}t}-\frac{1}{\sqrt{2}}{e}^{-i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}\end{array}\right];\end{array}$

Light field is E ₁₆light signal after polarization beam apparatus 2-15, be divided into two polarized light signals, the light field of light signal inputted as the first photoelectric detector 2-16 is:

$\begin{array}{c}{E}_{17}=\frac{A}{4}\×[T_{\mathrm{xx}}\left({\mathrm{\ω}}_c\right)\×e^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}-2\sqrt{2}{T}_{\mathrm{xy}}\left({\mathrm{\ω}}_c\right)\×e^{-i{\mathrm{\ω}}_{c}t}\\ +\frac{1}{\sqrt{2}}{e}^{-i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}]\end{array}$

Light field as the light signal of the second photoelectric detector 2-18 input is:

$\begin{array}{c}{E}_{18}=\frac{A}{4}\×[T_{\mathrm{yx}}\left({\mathrm{\ω}}_c\right)\×e^{-i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}-2\sqrt{2}{T}_{\mathrm{yy}}\left({\mathrm{\ω}}_c\right)\×e^{-i{\mathrm{\ω}}_{c}t}-\\ \frac{1}{\sqrt{2}}{e}^{-i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}];\end{array}$

The output of the first photoelectric detector 2-16 is:

$I_1\left({\mathrm{\ω}}_c\right)=\mathrm{Re}(E_{17}\·E_{17}^{*})=\frac{R\×{\left|A\right|}^2}{16}[T_{\mathrm{xx}}{\left({\mathrm{\ω}}_c\right)}^2\×e^{-22({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}+$

$\begin{array}{c}8T_{\mathrm{xy}}{\left({\mathrm{\ω}}_c\right)}^2\×e^{-2i{\mathrm{\ω}}_{c}t}+\frac{1}{2}{e}^{-2i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}-4\sqrt{2}{T}_{\mathrm{xx}}\left({\mathrm{\ω}}_c\right)\×Y_{\mathrm{xy}}\left({\mathrm{\ω}}_c\right)\×\\ e^{-i{\mathrm{\ω}}_{0}t}+\frac{2}{\sqrt{2}}{T}_{\mathrm{xx}}\left({\mathrm{\ω}}_c\right)\×e^{-2i{\mathrm{\ω}}_{0}t}-4T_{\mathrm{xy}}\left({\mathrm{\ω}}_c\right)\×e^{-i{\mathrm{\ω}}_{0}t}];\end{array}$

The output of the second photoelectric detector 2-18 is:

$\begin{array}{c}{I}_2\left({\mathrm{\ω}}_c\right)=\mathrm{Re}(E_{18}\·E_{18}^{*})=\frac{R\×{\left|A\right|}^2}{16}[T_{\mathrm{yx}}{\left({\mathrm{\ω}}_c\right)}^2\×e^{-2i({\mathrm{\ω}}_c+{\mathrm{\ω}}_0)t}+\\ 8T_{\mathrm{yy}}{\left({\mathrm{\ω}}_c\right)}^2\×e^{-2i{\mathrm{\ω}}_{c}t}+\frac{1}{2}{e}^{-2i({\mathrm{\ω}}_c-{\mathrm{\ω}}_0)t}-4\sqrt{2}{T}_{\mathrm{yx}}\left({\mathrm{\ω}}_c\right)\×T_{\mathrm{yy}}\left({\mathrm{\ω}}_c\right)\×\\ e^{-i{\mathrm{\ω}}_{0}t}-\frac{2}{\sqrt{2}}{T}_{\mathrm{yx}}\left({\mathrm{\ω}}_c\right)\×e^{-2i{\mathrm{\ω}}_{0}t}+4T_{\mathrm{yy}}\left({\mathrm{\ω}}_c\right)\×e^{-i{\mathrm{\ω}}_{0}t}];\end{array}$

I ₁as the input of the first electric filter unit 2-17, the first electric filter unit 2-17 is from I ₁(ω _c) in leach frequency be ω ₀and 2 ω ₀.The output signal that signal processing unit 2-20 obtains the first electric filter unit 2-17 is gone forward side by side row relax: 2 ω ₀item size is corresponding t can be drawn _xx(ω _c); ω ₀item size is corresponding t _xx(ω _c) known, can T be drawn _xy(ω _c).

I ₂as the input of the second electric filter unit 2-19, the second electric filter unit 2-19 is from I ₂(ω _c) in leach frequency be ω ₀and 2 ω ₀.The output signal that signal processing unit 2-20 obtains the second electric filter unit 2-19 is gone forward side by side row relax: 2 ω ₀item size is corresponding t can be drawn _yx(ω _c); ω ₀item size is corresponding t _yx(ω _c) known, can T be drawn _yy(ω _c).

So far, can show that to-be-measured cell 2-9 is ω in frequency _ctime transmission matrix:

$T\left({\mathrm{\ω}}_c\right)=\left[\begin{array}{cc}{T}_{\mathrm{xx}}\left({\mathrm{\ω}}_c\right)& T_{\mathrm{xy}}\left({\mathrm{\ω}}_c\right)\\ Y_{\mathrm{yx}}\left({\mathrm{\ω}}_x\right)& T_{\mathrm{yy}}\left({\mathrm{\ω}}_c\right)\end{array}\right].$

By changing the centre frequency ω of laser _cvalue, the transmission matrix of to-be-measured cell at different frequency place can be obtained, utilize existing method to process transmission matrix, the measurement of to-be-measured cell different frequency place parameter to be measured can be realized.

The transmission matrix that the present embodiment records is plural number, not only according to the loss characteristic of obtaining surveyed object to complex field transmission matrix, can also obtain the relevant parameter such as dispersion and polarization, achieve vector property and flexibility simultaneously.

Based on above-mentioned light vector network analyzer, present embodiments provide a kind of using method of light vector network analyzer, see Fig. 3, comprising:

Step 301: the frequency regulating described radio frequency source according to the requirement of certainty of measurement;

Step 302: according to the centre frequency of laser described in the frequency adjustment that described to-be-measured cell will be measured.Particularly, the centre frequency of laser described in the described frequency adjustment will measured according to described to-be-measured cell, the frequency making described centre frequency equal described to-be-measured cell will to measure.

It should be noted that, in this article, the relational terms of such as first and second and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element " being comprised " limited by statement, and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical factor.

One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in the storage medium of embodied on computer readable, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium in.

Finally it should be noted that: the foregoing is only preferred embodiment of the present invention, only for illustration of technical scheme of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.

Claims (10)

1. a light vector network analyzer, is characterized in that, comprising:

Laser (1), the first polarizing coupler (2), the second Polarization Controller (7), the 3rd polarizing coupler (8), to-be-measured cell (9), the 6th polarizing coupler (14), polarization beam apparatus (15) connect successively;

Described first polarizing coupler (2), intensity modulator (4), the second polarizing coupler (5), protect inclined high-pass optical filter (6), described 3rd polarizing coupler (8) connects successively, wherein, described intensity modulator (4) is connected with radio frequency source (3);

Described second polarizing coupler (5), protect logical optical filter (10) on the low side, the 4th polarizing coupler (11), the 5th polarizing coupler (13), described 6th polarizing coupler (14) connect successively;

Described 4th polarizing coupler (11), the first Polarization Controller (12), described 5th polarizing coupler (13) connect successively;

Described polarization beam apparatus (15), the first photoelectric detector (16), the first electric filter unit (17), signal processing unit (20) connect successively;

Described polarization beam apparatus (15), the second photoelectric detector (18), the second electric filter unit (19), described signal processing unit (20) connect successively;

The centre frequency of described laser (1) can regulate;

Described signal processing unit (20), for obtaining the output signal of described first electric filter unit (17) and described second electric filter unit (19) respectively, and obtain the transmission matrix of described to-be-measured cell (9) according to described output signal.

2. light vector network analyzer according to claim 1, is characterized in that, the splitting ratio of described first polarizing coupler (2) is 1:1.

3. light vector network analyzer according to claim 1, is characterized in that, the transmission matrix of described first Polarization Controller (12) is $\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right].$

4. light vector network analyzer according to claim 1, is characterized in that, the transmission matrix of described second Polarization Controller (7) is $\left[\begin{array}{cc}0& 1\\ -1& 0\end{array}\right].$

5. light vector network analyzer according to claim 1, is characterized in that, the span of the cut-off frequency of the inclined high-pass optical filter of described guarantor (6) is (ω _c-ω ₀, ω _c+ ω ₀), described ω _cfor the centre frequency of described laser (1), described ω ₀for the frequency of described radio frequency source (3).

6. light vector network analyzer according to claim 1, is characterized in that, the span of the cut-off frequency of described guarantor is on the low side logical optical filter (10) is (ω _c-ω ₀, ω _c+ ω ₀), described ω _cfor the centre frequency of described laser (1), described ω ₀for the frequency of described radio frequency source (3).

7. light vector network analyzer according to claim 1, is characterized in that, described first electric filter unit (17) comprising: the first low pass electrical filter, the first band energising filter;

The span of the cut-off frequency of described first low pass electrical filter is (ω ₀, 2 ω ₀);

The span of the lower limiting frequency of described first band energising filter is (ω ₀, 2 ω ₀);

The span of the upper cut off frequency of described first band energising filter is (2 ω ₀, ω _c-ω ₀);

Wherein, described ω _cfor the centre frequency of described laser (1), described ω ₀for the frequency of described radio frequency source (3).

8. light vector network analyzer according to claim 1, is characterized in that, described second electric filter unit (19) comprising: the second low pass electrical filter, the second band energising filter;

The span of the cut-off frequency of described second low pass electrical filter is (ω ₀, 2 ω ₀);

The span of the lower limiting frequency of described second band energising filter is (ω ₀, 2 ω ₀);

The span of the upper cut off frequency of described second band energising filter is (2 ω ₀, ω _c-ω ₀);

Wherein, described ω _cfor the centre frequency of described laser (1), described ω ₀for the frequency of described radio frequency source (3).

9. the using method of arbitrary described light vector network analyzer in claim 1-8, is characterized in that, comprising:

The frequency of described radio frequency source (3) is regulated according to the requirement of certainty of measurement;

According to the centre frequency of laser (1) described in the frequency adjustment that described to-be-measured cell (9) will be measured.

10. using method according to claim 9, is characterized in that, the centre frequency of laser (1) described in the described frequency adjustment will measured according to described to-be-measured cell (9), comprising:

The centre frequency of laser (1) described in the described frequency adjustment will measured according to described to-be-measured cell (9), the frequency making described centre frequency equal described to-be-measured cell (9) will to measure.