CN103234735B - Measure the apparatus and method of electro-optic intensity modulator chirp parameter frequency response characteristic - Google Patents
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Abstract
The invention discloses a kind of apparatus and method measuring electro-optic intensity modulator chirp parameter frequency response characteristic, relate to photoelectron technical field.Tunable laser, Polarization Controller, electro-optic intensity modulator to be measured, microwave signal source, the first optical connector, the second optical connector, single-mode fiber, light power meter, photodetector, microwave power meter, data collecting card, computing machine; Between described tunable laser, Polarization Controller, electro-optic intensity modulator to be measured, the first optical connector, dispersive optical fiber group, the second optical connector, photodetector, light path connects successively; Between described photodetector, microwave power meter, data collecting card, computing machine, microwave signal source, circuit connects successively.The present invention has high, the easy to operate advantage of measuring accuracy, in optical fiber telecommunications system, electro-optic intensity modulator analysis, optical signal prosessing, have important application prospect.
Description
Technical Field
The invention belongs to the technical field of photoelectrons, relates to an optical fiber communication technology and an optoelectronic signal processing technology, and particularly relates to a device and a method for measuring the chirp parameter frequency response characteristic of an electro-optical intensity modulator.
Background
In modern optical fiber communication, the chirp of an optical signal is one of important factors limiting high-speed and high-quality transmission of the optical signal of a communication network, and thus is an important parameter for evaluating the quality of the optical signal, and the chirp of the optical signal is derived from phase change of the optical signal caused by directly or indirectly modulating a laser signal.
An electro-optical intensity modulator, which is a typical electro-optical external modulator, is one of the most basic and critical optoelectronic devices in modern optical communication systems. When an optical signal with chirp enters a receiver, an error code condition is generated, and the larger the chirp coefficient is, the higher the error code rate is, and the communication quality is reduced. So that accurate measurement of the chirp of the electro-optic intensity modulator is essential in optical fiber communications.
The chirp is inherent to the electro-optic intensity modulator, is caused by the optical properties of the optical crystal material for manufacturing the electro-optic intensity modulator, has an electro-optic effect and a nonlinear optical effect, and mainly due to the linear electro-optic effect, when an electric field is applied, two different refractive indexes are caused to appear, and when an optical signal passes through the two different refractive indexes, the phase change of the optical signal is subjected to frequency shift.
Most of the reports on measuring the chirp of the electro-optic intensity modulator at present only indicate the relationship between the chirp of the electro-optic intensity modulator and the bias voltage thereof, and by default the chirp of the electro-optic intensity modulator is constant under the condition of the modulation frequency variation (see documents f.devaux, y.sorel, j.f.kerdiles. simple measurement of the fiber distribution and parameter of the journal of the interferometric modulation parameter of the chirp lighting technology,1993, vol.11, No.12, pp.1937-1940.). In practice, the chirp of the electro-optic intensity modulator changes its value at different modulation frequencies (see literature WeiYuxin, ZhaoYong, YangJianyi, wangmingha, Jiang, xiaoqing.chirp-modulation understandings, 2011, vol.29, No.7, pp.1011-1017), but this method only indicates the change values of the chirp parameter of the electro-optic intensity modulator at a limited number of modulation frequencies, and does not indicate how the chirp parameter of the electro-optic intensity modulator changes with the change of the modulation frequency in particular.
It has been proved that a method for measuring chirp parameters of an electro-optical intensity modulator by using an optical fiber frequency response method is disclosed (see document king ann bin, wujian, zhang, linkung, semiconductor science, 2003, 1 month, 24 st paragraph 1.), and the method is characterized in that under the condition of small signal modulation, resonance frequency peaks generated due to interference of sideband signals and carrier signals are observed from a network analyzer, and accurate and repeatable measured chirp parameter values can be obtained from the resonance frequency peaks.
Disclosure of Invention
In view of the above prior art, an object of the present invention is to provide a device and a method for measuring a frequency response characteristic of a chirp parameter of an electro-optical intensity modulator, which aims to solve the technical problem that the chirp parameter of the electro-optical intensity modulator cannot be measured along with the change of modulation frequency in the prior art. The frequency response curve is obtained by using an optical fiber frequency response method, and the characteristic curve of the frequency response of the chirp parameter of the electro-optic intensity modulator is obtained by measuring data calculation, so that the change value of the chirp parameter of the electro-optic intensity modulator under different modulation frequencies can be analyzed.
In order to solve the technical problems, the invention adopts the following technical scheme:
a device for measuring chirp parameter frequency response characteristics of an electro-optic intensity modulator is characterized by comprising a tunable laser (1), a polarization controller (2), the electro-optic intensity modulator (3) to be measured, a microwave signal source (4), a first optical connector (51), a second optical connector (52), a dispersion optical fiber group (6), an optical power meter (7), a photoelectric detector (8), a microwave power meter (9), a data acquisition card (10) and a computer (11);
the tunable laser (1), the polarization controller (2), the electro-optic intensity modulator (3) to be tested, the first optical connector (51), the dispersion optical fiber group (6), the second optical connector (52) and the photoelectric detector (8) are sequentially connected through optical paths; the photoelectric detector (8), the microwave power meter (9), the data acquisition card (10), the computer (11) and the microwave signal source (4) are sequentially connected by a circuit;
the second optical connector (52) and the optical power meter (7) are connected by an optical path; the dispersive optical fiber group (6) comprises a first dispersive optical fiber (61) and a second dispersive optical fiber (62); the electro-optical intensity modulator (3) to be tested is connected with the microwave signal source (4) through a microwave circuit.
The microwave power is acquired by a data acquisition card (10) to a computer (11) for data processing and analysis, and a curve of microwave power output by the photoelectric detector (8) along with the change of microwave frequency scanned by the microwave signal source (4) is obtained.
In the invention, the tunable laser (1) is a semiconductor laser or a fiber laser with tunable wavelength.
In the invention, the first optical connector (51) and the second optical connector (52) are optical fiber connectors, optical lenses or optical prisms.
In the present invention, the first dispersion fiber and the second dispersion fiber are standard single mode fibers, dispersion shifted fibers or dispersion compensating fibers.
In the present invention, the second dispersion fiber (62) has twice the dispersion as the first dispersion fiber (61).
The method for measuring the chirp parameter frequency response characteristic of the electro-optic intensity modulator by using the measuring device provided by the invention is characterized by comprising the following steps of:
step one, the light wave with the wavelength of lambda output by the tunable laser (1) is subjected to polarizationThe vibration controller (2) is input to an electro-optical intensity modulator (3), microwave signals output by a microwave signal source (4) are modulated onto optical carriers through the electro-optical intensity modulator (3), the microwave modulated optical carriers output by the electro-optical intensity modulator (3) enter a dispersion optical fiber (6) through a first optical connector (51), then enter a photoelectric detector (8) through a second optical connector (52), the photoelectric detector (8) outputs electric signals, power measurement is carried out on the electric signals through a microwave power meter (9), namely microwave power, the microwave power is collected to a computer (11) through a data acquisition card (10) for data processing and analysis, curves of the microwave power output by the photoelectric detector (8) along with the change of the scanning output microwave frequency of the microwave signal source (4) are obtained after the data processing and analysis, and when the first optical connector (51) is connected with the second optical connector (52) and when the first color dispersion optical connector (51) is connected with the second optical connector (52) are recorded, and the first color dispersion optical connector (51) is connected with the second The curves of the microwave power along with the frequency change of the microwave signal source (4) under three conditions of the fiber (61) and the second dispersion fiber (62) are respectivelyC 0、C 1AndC 2；
step two, disconnecting the circuit connection between the microwave signal source (4) and the electro-optical intensity modulator (3) to be tested, and recording the optical power values of the optical power meter (7) under the three conditions asP 0、P 1AndP 2(ii) a Using measured values of optical powerP 0、P 1AndP 2and curveC 0To curveC 1AndC 2are normalized, i.e.C n1=P 0 C 1/(C0P1) AndC n2=P 0 C 2/(C0P2)；
step three, respectively on the curveC n1AndC n2finding all microwave power minimum points with the frequency not being zero, and turning the data between the odd microwave power minimum point and the next even microwave power minimum point adjacent to the odd microwave power minimum pointFor negative numbers, a new set of data points and curves resembling the cosine curve are obtainedD n1AndD n2using the formula:
obtaining the chirp parameter of the electro-optical intensity modulator (3)αModulation frequency dependent on microwave signal source (4)fThe variation curve of (d); wherein,f u is a curveD n2The frequency corresponding to the first zero point in (c),D n1(f u) Is a curveD n1Frequency off u Corresponding data;
step four, changing the wavelength lambda of the light wave output by the tunable laser (1), and repeating the steps to obtain the chirp parameter of the electro-optic intensity modulator (3) under different light wavelengthsα(f) Is plotted against the microwave modulation frequency.
Compared with the prior art, the invention has the following beneficial effects:
firstly, how the chirp parameter of the electro-optic intensity modulator changes with the change of the modulation frequency is indicated, and a characteristic curve of the frequency response of the chirp parameter of the electro-optic intensity modulator is obtained, so that the chirp parameter of the electro-optic intensity modulator under different modulation frequencies can be analyzed.
And secondly, the measuring device is simple and convenient to operate, the measuring precision is high, the calculation method is simple, the optical fiber dispersion coefficient value and the optical fiber length value are not considered, and the result is accurate.
Drawings
Fig. 1 is a schematic diagram of the device for measuring the chirp frequency response characteristic of the electro-optic intensity modulator.
FIG. 2 is a graph of the frequency response of a dispersive optical fiber according to an embodiment of the present invention.
FIG. 3 is a graph of normalized dispersion fiber frequency response for an embodiment of the present invention.
Fig. 4 is a new curve diagram of a set of cosine-like curves obtained by inverting the normalized dispersion fiber frequency response curve at the microwave power minimum point in the embodiment of the present invention.
Fig. 5 is a frequency response characteristic graph of the chirp parameter of the electro-optic intensity modulator in the embodiment of the invention.
The reference signs are: the system comprises a tunable laser 1, a polarization controller 2, an electro-optical intensity modulator to be measured 3, a microwave signal source 4, a first optical connector 51, a second optical connector 52, a dispersion optical fiber group 6, a first dispersion optical fiber 61, a second dispersion optical fiber 62, an optical power meter 7, a photoelectric detector 8, a microwave power meter 9, a data acquisition card 10 and a computer 11.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments.
A device for measuring chirp parameter frequency response characteristics of an electro-optic intensity modulator is characterized by comprising a tunable laser (1), a polarization controller (2), the electro-optic intensity modulator (3) to be measured, a microwave signal source (4), a first optical connector (51), a second optical connector (52), a dispersion optical fiber group (6), an optical power meter (7), a photoelectric detector (8), a microwave power meter (9), a data acquisition card (10) and a computer (11); the tunable laser (1), the polarization controller (2), the electro-optic intensity modulator (3) to be tested, the first optical connector (51), the dispersion optical fiber group (6), the second optical connector (52) and the photoelectric detector (8) are sequentially connected through optical paths; the photoelectric detector (8), the microwave power meter (9), the data acquisition card (10), the computer (11) and the microwave signal source (4) are sequentially connected by a circuit; the second optical connector (52) and the optical power meter (7) are connected by an optical path; the dispersive optical fiber group (6) comprises a first dispersive optical fiber (61) and a second dispersive optical fiber (62); the electro-optical intensity modulator (3) to be tested is connected with the microwave signal source (4) through a microwave circuit.
The working principle of the invention is as follows:
when the device for measuring the chirp parameter frequency response characteristic of the electro-optic intensity modulator is used for chirp measurement, light waves with the wavelength of lambda output by a tunable laser 1 are input to the electro-optic intensity modulator 3 through a polarization controller 2, microwave signals output by a microwave signal source 4 are modulated onto optical carriers through the electro-optic intensity modulator 3, the microwave modulated optical carriers output by the electro-optic intensity modulator 3 enter a dispersion optical fiber group 6 through a first optical connector 51, then enter a photoelectric detector 8 through a second optical connector 52, electric signals output by the photoelectric detector 8 are subjected to power measurement, namely microwave power, through a microwave power meter 9, are collected to a computer 11 through a data acquisition card 10 for data processing and analysis, so that a curve of the microwave power output by the photoelectric detector 8 along with the change of the microwave frequency scanned and output by the microwave signal source 4 is obtained, and the connection between the first optical connector 51 and the second optical connector 52 and the division between the first optical connector 51 and the second optical connector 52 are recorded The curves of the microwave power changing with the frequency of the microwave signal source 4 under the three conditions when the first dispersion optical fiber 61 and the second dispersion optical fiber 62 are connected respectively areC 0、C 1AndC 2(ii) a The circuit connection between the microwave signal source 4 and the electro-optical intensity modulator 3 to be measured is cut off, and the optical power values of the optical power meter 7 under the three conditions are recorded asP 0、P 1AndP 2(ii) a Using measured values of optical powerP 0、P 1AndP 2and curveC 0To curveC 1AndC 2are normalized, i.e.C n1=P 0 C 1/(C 0 P 1) AndC n2=P 0 C 2/(C 0 P 2) Obtaining:
respectively in the curveC n1AndC n2finding out all microwave power minimum points with the frequency not equal to zero, turning the data between the odd microwave power minimum point and the next adjacent even microwave power minimum point into negative numbers to obtain a new group of data points and curves similar to the cosine curveD n1AndD n2：
the following equations (3) and (4) yield:
the chirp parameter α of the electro-optic intensity modulator (3) is obtained along with the modulation frequency of the microwave signal source (4)fThe variation curve of (d); wherein,f u is a curveD n2The frequency corresponding to the first zero point in (c),D n1(f u) Is a curveD n1Frequency off u Corresponding data; changing the wavelength lambda of the light wave output by the tunable laser (1), repeating the steps to obtain the chirp parameter of the electro-optic intensity modulator (3) under different light wavelengthsα(f) Is plotted against the microwave modulation frequency.
Examples
FIG. 1 is a graph of the chirp frequency response of the electro-optic intensity modulator of the present inventionSchematic representation of the device according to the characteristics. The light wave with wavelength lambda output by the tunable laser 1 is input to the electro-optical intensity modulator 3 through the polarization controller 2, the microwave signal output by the microwave signal source 4 is modulated onto the optical carrier through the electro-optical intensity modulator 3, the microwave modulated optical carrier output by the electro-optical intensity modulator 3 enters the dispersion optical fiber group 6 through the first optical connector 51, then enters the photoelectric detector 8 through the second optical connector 52, the electric signal output by the photoelectric detector 8 is subjected to power measurement, namely microwave power, through the microwave power meter 9, the microwave power is acquired to the computer 11 through the data acquisition card 10 for data processing and analysis, a curve of the microwave power output by the photoelectric detector 8 along with the microwave frequency variation scanned and output by the microwave signal source 4 is obtained, and the curves of the microwave power along with the microwave frequency variation under three conditions that the first dispersion optical fiber 61 and the second dispersion optical fiber 62 are respectively connected between the first optical connector 51 and the second optical connector 52 and the first optical connector 51 and the second optical connector 52 are respectively connected between the microwave Respectively, ofC 0、C 1AndC 2(ii) a The circuit connection between the microwave signal source 4 and the electro-optical intensity modulator 3 to be measured is cut off, and the optical power values of the optical power meter 7 under the three conditions are recorded asP 0、P 1AndP 2(ii) a Using measured values of optical powerP 0、P 1AndP 2and curveC 0To curveC 1AndC 2are normalized, i.e.C n1=P 0 C 1/(C 0 P 1) AndC n2=P 0 C 2/(C 0 P 2) (ii) a Respectively in the curveC n1AndC n2finding out all microwave power minimum points with the frequency not equal to zero, turning the data between the odd microwave power minimum point and the next adjacent even microwave power minimum point into negative numbers to obtain a new group of data points and curves similar to the cosine curveD n1AndD n2the frequency response characteristic curve of the chirp parameter of the electro-optic intensity modulator can be obtained by using the formula (3)。
The tunable laser 1 adopts a semiconductor wavelength tunable laser, the output light wavelength is 1550nm, the electro-optical intensity modulator 3 adopts an M-Z electro-optical intensity modulator, the first optical connector 51 and the second optical connector 52 adopt optical fiber connectors, the dispersion optical fiber 61 and the dispersion optical fiber 62 adopt single standard single-mode optical fibers, and the lengths are 10.25km and 20.5km respectively.
Curves of changes in microwave power with the frequency of the microwave signal source 4 are recorded in the case of connecting the first optical connector 51 to the second optical connector 52 and in the case of connecting the dispersion fiber 61 and the dispersion fiber 62 between the first optical connector 51 and the second optical connector 52, respectivelyC 0、C 1AndC 2as shown in fig. 2; the circuit connection between the microwave signal source 4 and the electro-optical intensity modulator 3 to be measured is cut off, and the optical power values of the optical power meter 7 under the three conditions are recorded asP 0=3.8371mw、P 1=2.3823mw andP 2=1.4757 mw. By means of measured values of optical powerP 0、P 1AndP 2and curveC 0To curveC 1AndC 2are normalized, i.e.C n1=P 0 C 1/(C 0 P 1) AndC n2=P 0 C 2/(C 0 P 2) To obtainC n1AndC n2as shown in fig. 3. Respectively in the curveC n1AndC n2finding out all microwave power minimum points with the frequency not equal to zero, turning the data between the odd microwave power minimum point and the next adjacent even microwave power minimum point into negative numbers to obtain a new group of data points and curves similar to the cosine curveD n1AndD n2as shown in fig. 4.
Microwave modulation frequency function curve obtained by dispersive fiber 62D n2The first zero point of (a) corresponds to a frequency value off u =8.9207GHz, curve of microwave modulation frequency as a function of frequency obtained by means of a dispersive optical fiber 61D n1At the modulation frequencyf u Data corresponding to =8.9207GHz isD n1(f u) =0.5346, the frequency response characteristic of the chirp parameter of the electro-optical intensity modulator is calculated by substituting equation (5), as shown in fig. 5.
The above description is a more detailed description of the present invention in connection with preferred embodiments, and the specific embodiments of the present invention are not to be considered limited to these descriptions. It will be apparent to those skilled in the art that various modifications, additions, substitutions, and the like can be made without departing from the spirit of the invention.
Claims (4)
1. A device for measuring chirp parameter frequency response characteristics of an electro-optic intensity modulator is characterized by comprising a tunable laser (1), a polarization controller (2), the electro-optic intensity modulator (3) to be measured, a microwave signal source (4), a first optical connector (51), a second optical connector (52), a dispersion optical fiber group (6), an optical power meter (7), a photoelectric detector (8), a microwave power meter (9), a data acquisition card (10) and a computer (11);
the tunable laser (1), the polarization controller (2), the electro-optic intensity modulator (3) to be tested, the first optical connector (51), the dispersion optical fiber group (6), the second optical connector (52) and the photoelectric detector (8) are sequentially connected through optical paths; the photoelectric detector (8), the microwave power meter (9), the data acquisition card (10), the computer (11) and the microwave signal source (4) are sequentially connected by a circuit; the second optical connector (52) and the optical power meter (7) are connected by an optical path; the dispersive optical fiber group (6) comprises a first dispersive optical fiber (61) and a second dispersive optical fiber (62); the electro-optical intensity modulator (3) to be tested is connected with the microwave signal source (4) through a microwave circuit; the method comprises the steps that light waves with the wavelength of lambda output by a tunable laser (1) are input to an electro-optical intensity modulator (3) through a polarization controller (2), microwave signals output by a microwave signal source (4) are modulated onto optical carriers through the electro-optical intensity modulator (3), the microwave modulated optical carriers output by the electro-optical intensity modulator (3) enter a dispersion optical fiber group through a first optical connector (51), then enter an electro-optical detector (8) through a second optical connector (52), the photoelectric detectors (8) output electric signals, power measurement is carried out on the electric signals through a microwave power meter (9), namely microwave power is acquired to a computer (11) through a data acquisition card (10) to carry out data processing and analysis, and a curve that the microwave power output by the photoelectric detectors (8) changes along with the scanning output microwave frequency of the microwave signal source (4) is obtained; the first dispersion fiber and the second dispersion fiber are standard single mode fibers, dispersion shifted fibers or dispersion compensating fibers, and the dispersion of the second dispersion fiber (62) is twice that of the first dispersion fiber (61).
2. The apparatus for measuring the chirp parameter frequency response characteristic of the electro-optic intensity modulator according to claim 1, wherein the tunable laser (1) is a semiconductor laser or a fiber laser with tunable wavelength.
3. The apparatus for measuring chirp parameter frequency response characteristics of an electro-optic intensity modulator according to claim 1, wherein the first optical connector (51) and the second optical connector (52) are optical fiber connectors, optical lenses or optical prisms.
4. A method for measuring the chirp parameter frequency response characteristic of an electro-optic intensity modulator using the apparatus of claim 1, comprising the steps of:
recording curves of microwave power changing along with the frequency of a microwave signal source (4) under three conditions that a first optical connector (51) is connected with a second optical connector (52) and a first dispersive optical fiber (61) and a second dispersive optical fiber (62) are respectively connected between the first optical connector (51) and the second optical connector (52), wherein the curves are respectively C0、C1And C2The second dispersive fiber (62) has twice the dispersion as the first dispersive fiber (61);
step two, disconnecting the circuit connection between the microwave signal source (4) and the electro-optical intensity modulator (3) to be tested, and recording the optical power values of the optical power meter (7) under the three conditions as P0、P1And P2(ii) a Using measured values of optical power P0、P1And P2And curve C0For curve C1And C2Normalization is carried out, i.e. Cn1＝P0C1/(C0P1) And Cn2＝P0C2/(C0P2)；
Step three, respectively on the curve Cn1And Cn2Finding out all microwave power minimum points with the frequency not equal to zero, turning the data between the odd microwave power minimum point and the next adjacent even microwave power minimum point into negative numbers to obtain a new group of data points similar to the cosine curve and a curve Dn1And Dn2Using the formula:
obtaining the change curve of the chirp parameter α of the electro-optical intensity modulator (3) along with the modulation frequency f of the microwave signal source (4), wherein fuIs a curve Dn2Frequency corresponding to the first zero point of (D)n1(fu) Is a curve Dn1Frequency f inuCorresponding data;
and step four, changing the wavelength lambda of the light wave output by the tunable laser (1), and repeating the steps to obtain a curve of the chirp parameter alpha (f) of the electro-optic intensity modulator (3) changing along with the microwave modulation frequency under different light wavelengths.
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