CN111917485A - Intensity modulation optical signal eye pattern measuring device and method based on linear light sampling - Google Patents
Intensity modulation optical signal eye pattern measuring device and method based on linear light sampling Download PDFInfo
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Abstract
The invention relates to an intensity modulation optical signal eye pattern measuring device and method based on linear optical sampling, wherein the device comprises a signal input end to be measured and a local oscillation pulse light source, the signal input end to be measured and the local oscillation pulse light source are both connected to a 3 x 3 optical coupler, the output of the 3 x 3 optical coupler is divided into three paths, wherein the first path of output is connected to a digital signal processing unit through a first photoelectric detector and a first analog-to-digital converter, the second path of output is connected to the digital signal processing unit through a second photoelectric detector and a second analog-to-digital converter, and the third path of output is connected to the digital signal processing unit through a third photoelectric detector and a third analog-. The intensity modulation optical signal eye pattern measuring device and method based on linear light sampling have the advantages of high sensitivity, high fidelity and high resolution; the optical front end of linear light sampling is simplified, and the hardware overhead is reduced; the unbalance degree of the photoelectric detector is easy to compensate, and the photoelectric detector is simple and reliable; the optical signal can be measured by any intensity modulation, and the requirement on the local oscillation pulse light source is low.
Description
Technical Field
The invention relates to the field of eye pattern measurement of intensity modulated light signals, in particular to an eye pattern measurement device and method of intensity modulated light signals based on linear light sampling.
Background
With the rapid increase of the capacity of the optical fiber communication system, the application of the advanced modulation format is receiving wide attention. The occurrence of multilevel amplitude modulation signals, particularly four-level pulse amplitude modulation (PAM-4) signals, is expected to become a preferred modulation format for future ultra-large capacity optical interconnects. For intensity modulated signals, accurate measurement of the eye pattern is critical to analyzing the optical signal quality. Conventional techniques for signal eye measurement over the electrical domain are well established, but are primarily limited by hardware bandwidth. Especially for high-speed intensity modulated optical signals, large bandwidth Photodetectors (PDs) and high-speed analog-to-digital converters (ADCs) are required. For example, when a 56GbaudPAM-4 signal eye diagram is measured by using a real-time sampling oscilloscope, a photoelectric detector with a bandwidth of more than 40GHz and a corresponding high-speed analog-to-digital converter are needed, so that huge pressure is generated on hardware, and the measurement cost is high. The all-optical sampling uses an optical pulse sequence with narrow pulse width and low repetition frequency to sample a to-be-measured optical signal in an optical domain, and can realize accurate sampling of a high-speed signal only by a narrow-band photoelectric detector and a low-speed analog-to-digital converter, thereby effectively breaking through the electronic bottleneck of the traditional measurement. Measuring the intensity modulated signal eye diagram typically utilizes nonlinear optical sampling with highly nonlinear fiber and semiconductor amplifier nonlinear effects, but this technique results in less sensitive sampling systems due to inherently low conversion efficiency of nonlinear effects.
In view of coherent detection, a 90-degree mixer and a balanced detector are utilized to perform coherent sampling on a to-be-detected optical signal in an optical domain, so that the sampling sensitivity can be greatly improved, and optical sampling with high bandwidth, high resolution and high fidelity can be realized by combining Digital Signal Processing (DSP), and the linear optical sampling is usually used for detecting high-speed signals with phase modulation. The 56GbaudPAM-4 signal eye diagram can be measured by using a linear optical sampling technology and only using a photoelectric detector with a bandwidth of hundreds of MHz and a low-speed analog-to-digital converter.
The conventional linear light sampling device is shown in fig. 1, and the basic principle is as follows: the optical signal to be measured and the sampling optical pulse are mixed in a 90-degree mixer, four paths of mixed signals are output, photoelectric conversion is carried out through two narrow bandwidth balance detectors, an in-phase component (I) and an orthogonal-phase component (Q) are output respectively, and corresponding digital signal processing algorithms can be carried out after low-speed digital-to-analog conversion is carried out to obtain information such as the intensity, the phase and the like of the signal to be measured. If the signal to be measured has polarization modulation, a Polarization Beam Splitter (PBS) is added before the optical signal to be measured and the sampling optical pulse enter a 90-degree mixer, and an equal sampling structure is added. The existing linear optical sampling device needs to use an expensive 90-degree mixer and a plurality of balanced detectors, so that the system cost is high, the competitiveness is not high compared with the traditional electric domain sampling, the linear optical sampling device cannot be popularized and applied, and the linear optical sampling device is not suitable for actually measuring single intensity modulated optical signals. The sampling precision depends on the common mode rejection ratio of the balance detector, and the unbalanced responsivity of the balance detector has large influence on sampling and is not easy to adjust. In practice, therefore, it is desirable to perform eye diagram measurement on high-speed intensity modulated signals based on a simplified linear optical sampling architecture and corresponding digital signal processing method.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an intensity modulation optical signal eye pattern measuring device and method based on linear optical sampling, and solves the technical problem of high cost of the conventional linear optical sampling device.
The invention is realized by the following technical scheme:
the intensity modulation optical signal eye pattern measuring device based on linear optical sampling comprises a signal input end to be measured and a local oscillation pulse light source, wherein the signal input end to be measured and the local oscillation pulse light source are both connected to a 3 x 3 optical coupler, the output of the 3 x 3 optical coupler is divided into three paths, the first path of output is connected to a digital signal processing unit through a first photoelectric detector and a first analog-to-digital converter, the second path of output is connected to the digital signal processing unit through a second photoelectric detector and a second analog-to-digital converter, and the third path of output is connected to the digital signal processing unit through a third photoelectric detector and a third analog-to-digital converter.
Furthermore, a first polarization controller is connected between the input end of the signal to be measured and the 3 × 3 optical coupler, and a second polarization controller is connected between the local oscillation pulse light source and the 3 × 3 optical coupler.
Furthermore, the digital signal processing unit comprises a component recovery subunit, an amplitude compensation subunit, a peak value extraction subunit, an eye pattern reconstruction subunit and an eye pattern measurement subunit which are sequentially connected and arranged;
the component recovery subunit is used for recovering the in-phase component and the quadrature-phase component in the mixed signal;
the amplitude compensation subunit is used for eliminating the influence of frequency offset and phase offset between the local oscillator pulse light and the intensity modulation optical signal to be detected;
and the peak value extraction subunit is used for extracting effective numerical value points which are consistent with the actual sampling points of the signals to be detected.
Further, the power division ratio of the 3 × 3 optical coupler is 1:1: 1.
Furthermore, the first photoelectric detector, the second photoelectric detector and the third photoelectric detector are all single-ended photoelectric detectors.
Furthermore, the first analog-to-digital converter, the second analog-to-digital converter and the third analog-to-digital converter are all low-speed analog-to-digital converters.
The method for measuring the intensity modulation optical signal eye diagram based on linear light sampling specifically comprises the following steps:
s1: inputting the intensity modulation optical signal to be detected and a local oscillation pulse light source into a 3 multiplied by 3 optical coupler for frequency mixing;
s2: the 3 x 3 optical coupler outputs three paths of mixed optical signals which are respectively converted into three paths of electric signals by a first photoelectric detector, a second photoelectric detector and a third photoelectric detector;
s3: the three paths of electric signals are converted by a first analog-to-digital converter, a second analog-to-digital converter and a third analog-to-digital converter respectively to obtain three paths of digital signals;
s4: and inputting the three paths of digital signals into a digital signal processing unit, and obtaining analysis information of the eye diagram of the signal to be detected after signal analysis and processing.
Further, in S1, the spectrum of the sampling optical pulse emitted by the local oscillation pulse light source is fully overlapped with the spectrum of the intensity modulated optical signal to be measured, and the 3dB bandwidth of the sampling optical pulse is greater than twice the bandwidth of the intensity modulated optical signal to be measured.
Further, the specific processing steps performed in the digital signal processing unit in S4 include:
s41: restoring an in-phase component and a quadrature-phase component of the mixed signal through digital signal processing;
s42: performing amplitude compensation on the two recovered signal signals;
s43: extracting peak points from the amplitude values of the sampling points as actual sampling values;
s44: carrying out variance transformation and fast Fourier transformation on the extracted peak points to obtain an equivalent sampling period number S, and reconstructing an eye diagram of the signal to be detected;
s45: eye measurements are made from the reconstructed signal eye.
Further, in the step S44, the equivalent sampling cycle number S obtained by performing variance transformation and fast fourier transform on the peak point is the rough sampling cycle number S, and further, the chirp Z transform is performed within the range of [ S-0.5, S +0.5] to obtain the accurate equivalent sampling cycle number, and then the eye diagram of the signal to be measured is reconstructed.
Compared with the prior art, the invention has the beneficial effects that:
the intensity modulation optical signal eye pattern measuring device and method based on linear optical sampling provided by the invention are used for measuring the signal eye pattern based on the linear optical sampling, break through the electronic bottleneck of the traditional electric domain measurement, and have high sensitivity, high fidelity and high resolution; 3 x 3 optical coupler and single-end photoelectric detector are used to replace 90 degree mixer and balance detector, so that the cost of linear optical sampling system is reduced; the repetition frequency of the sampling light pulse is far lower than the signal rate of the signal to be measured, and the accurate measurement of the eye pattern of the PAM-4 optical signal can be completed only by a photoelectric detector with 400MHz bandwidth and an analog-to-digital converter with 5GS/s sampling rate, so that the hardware requirement of the traditional electric domain measurement is greatly lower, and the hardware cost is reduced; the unbalance degree of the photoelectric detector is easy to compensate, and the photoelectric detector is simple and reliable; the spectrum of the sampling optical pulse is fully overlapped with the spectrum of the signal to be detected, and when the 3dB bandwidth of the sampling pulse is more than twice of the signal to be detected, the multi-wavelength PAM-4 optical signal can be measured, the requirement on the power of the sampling optical pulse is low, the sampling optical pulse is insensitive to the frequency offset and the phase offset of the sampling pulse, and the requirement on a local oscillation pulse light source is reduced.
Drawings
FIG. 1 is a schematic diagram of a prior art linear light sampling apparatus;
FIG. 2 is a schematic diagram of an eye diagram measuring apparatus for an intensity modulated optical signal based on linear optical sampling according to an embodiment of the present invention;
FIG. 3 is a timing diagram illustrating the in-phase component and the quadrature-phase component recovered from the 56GbaudPAM-4 optical signal simulation test according to an embodiment of the present invention;
FIG. 4 shows a peak point corresponding to an actual sampling point extracted in a 56GbaudPAM-4 optical signal simulation test according to an embodiment of the present invention;
FIG. 5 is a reconstructed eye diagram of a 56GbaudPAM-4 optical signal simulation test according to an embodiment of the present invention.
In the figure:
1. a signal input end to be tested; 2. a local oscillation pulse light source; 3. a first polarization controller; 4. a second polarization controller; 5. a 3 × 3 optical coupler; 6. a first photoelectric detector; 7. a second photoelectric detector; 8. a third photoelectric detector; 9. an analog-to-digital converter I; 10. a second analog-to-digital converter; 11. a third analog-to-digital converter; 100. a digital signal processing unit; 101. a component recovery subunit; 102. an amplitude compensation subunit; 103. a peak value extraction subunit; 104. an eye reconstruction subunit; 105. an eye pattern measurement subunit.
Detailed Description
The following examples are presented to illustrate certain embodiments of the invention in particular and should not be construed as limiting the scope of the invention. The present disclosure may be modified from materials, methods, and reaction conditions at the same time, and all such modifications are intended to be within the spirit and scope of the present invention.
As shown in fig. 2, the intensity modulation optical signal eye pattern measuring device based on linear optical sampling, in particular, four-level pulse amplitude modulation (PAM-4) signal eye pattern measurement, includes a signal to be measured input terminal 1 and a local oscillation pulse light source 2, where the signal to be measured input terminal 1 is connected to an input terminal of a 3 × 3 optical coupler 5 through a first polarization controller 3, the local oscillation pulse light source 2 is also connected to an input terminal of the 3 × 3 optical coupler 5 through a second polarization controller 4, and the first polarization controller 3 and the second polarization controller 4 respectively perform polarization adjustment on a PAM-4 optical signal to be measured and a sampling optical pulse so that the polarization direction of the optical signal is consistent with the polarization direction of the optical signal; the output of the 3 × 3 optical coupler 5 is divided into three paths, the power distribution ratio of the 3 × 3 optical coupler 5 is 1:1:1, wherein the first path of output is connected to the digital signal processing unit 100 through the first photodetector 6 and the first analog-to-digital converter 9, the second path of output is connected to the digital signal processing unit 100 through the second photodetector 7 and the second analog-to-digital converter 10, and the third path of output is connected to the digital signal processing unit 100 through the third photodetector 8 and the third analog-to-digital converter 11; the first photoelectric detector 6, the second photoelectric detector 7 and the third photoelectric detector 8 are all single-ended photoelectric detectors, the single-ended photoelectric detectors adopt photoelectric detectors with 400MHz bandwidth, the first analog-to-digital converter 9, the second analog-to-digital converter 10 and the third analog-to-digital converter 11 are all low-speed analog-to-digital converters, the analog-to-digital converters adopt analog-to-digital converters with 5GS/s sampling rate, hardware requirements of traditional electric domain measurement are greatly lowered, and hardware cost is lowered.
Inputting a PAM-4 optical signal to be detected into a signal input end 1 to be detected, adjusting the pulse width and the repetition frequency of a sampling optical pulse emitted by a local oscillator pulse light source 2 to make the sampling pulse suitable for the PAM-4 optical signal to be detected, carrying out polarization adjustment on the PAM-4 optical signal to be detected by a polarization controller I3, carrying out polarization adjustment on the sampling optical pulse by a polarization controller II 4 to make the polarization direction of the sampling optical pulse consistent with that of the optical signal, then, the three beams are respectively input to the first input port and the third input port of the 3 × 3 optical coupler 55 for frequency mixing, the three beams are respectively subjected to photoelectric detection by the first photoelectric detector 6, the second photoelectric detector 7 and the third photoelectric detector 8, so that optical signals are converted into electric signals, and then analog-to-digital conversion is performed by the first digital-to-analog converter 9, the second digital-to-analog converter 10 and the third digital-to-analog converter 11, so that three paths of digital signals are obtained and input to the digital signal processing unit (i.e., the DSP in fig. 2) 100 for implementing the.
In this embodiment, the digital signal processing unit 100 includes a component recovery subunit 101, an amplitude compensation subunit 102, a peak value extraction subunit 103, an eye diagram reconstruction subunit 104, and an eye diagram measurement subunit 105, which are sequentially connected and arranged; the component recovery subunit 101 is configured to recover an in-phase component and a quadrature-phase component in the mixed signal; the amplitude compensation subunit 102 is configured to eliminate the influence of frequency offset and phase offset between the local oscillator pulsed light and the intensity modulated optical signal to be detected; the peak value extraction subunit 103 is configured to extract an effective numerical point corresponding to an actual sampling point of the signal to be detected; the processing procedure of the eye reconstruction subunit 104 includes: firstly, performing variance transformation and then fast Fourier transformation on peak points to obtain a rough equivalent sampling period number S, and performing 8192-point linear frequency modulation z transformation in the range of [ S-0.5, S +0.5] to obtain an accurate equivalent sampling period number, thereby reconstructing a PAM-4 signal eye diagram; the eye pattern measuring subunit 105 completes eye pattern measurement according to the reconstructed signal eye pattern to obtain analysis information of the PAM-4 optical signal eye pattern to be measured.
The method for measuring the intensity modulation optical signal eye diagram based on linear light sampling specifically comprises the following steps:
s1: inputting the intensity modulation optical signal to be detected and a local oscillator pulse light source 2 into a 3 x 3 optical coupler 5 together for frequency mixing, wherein sampling pulses sent by the local oscillator pulse light source 2 are sampling optical pulses with narrow pulse width and low repetition frequency, and the sampling optical pulses periodically sample the intensity modulation optical signal to be detected;
when the spectrums of the sampling pulse and the signal to be detected are fully overlapped, and the 3dB bandwidth of the sampling pulse is more than twice of that of the signal to be detected, the sampling pulse samples at different positions of the signal to be detected through an optical coupler, and the mixed signal carries full-field information of the signal to be detected;
the pulse width of the sampling pulse determines the resolution of the sampling, the symbol rate B of the signal to be measured and the repetition frequency f of the sampling pulseSThe following conditions need to be satisfied:
|fS/(B-NfS)|＝M (1)
where B is the symbol rate of the signal under test, fSIs the repetition frequency of the sampling pulse, N being the closest to B/fSIs an integer of (1). M represents the equivalent sampling point of the code element period, and if the sampling period is too large, the sampling period is too long, and f needs to be accurately adjustedSTo change M so that as many symbol envelope positions as possible are sampled.
The optical signal to be measured and the sampling light pulse are expressed as:
wherein A isS、ωSAnd
respectively the amplitude, frequency and phase of the signal to be measured, AL、ωLAnd
respectively the amplitude, frequency and phase of the sampling pulse,
including phase noise of the sampling pulses. T represents the period of the sampling pulse, and n is the number of periods.
S2: the 3 x 3 optical coupler 5 outputs three paths of mixed optical signals which are respectively converted into three paths of electric signals by a first photoelectric detector 6, a second photoelectric detector 7 and a third photoelectric detector 8;
the electric field relationship expression of the input and output of the 3 × 3 optical coupler 5 with the power division ratio of 1:1:1 is:
wherein the conversion coefficient
Assuming that the responsivities of the first photoelectric detector 6, the second photoelectric detector 7 and the third photoelectric detector 8 are all R, obtaining currents of three mixed signals after photoelectric detection:
wherein, the frequency deviation delta omega between the sampling pulse and the signal to be measured is omegaS-ωLOut of phase
The second term in the formula is a beat frequency term and carries full-field information of the signal.
The beat frequency signal light field intensity detected by the first photoelectric detector 6, the second photoelectric detector 7 and the third photoelectric detector 8 is linearly related to the light signal field intensity to be detected, and is about 2RALAnd the sampling pulse amplitude is far greater than the signal to be detected under the general condition, so that the sensitivity of the sampling system is greatly improved, and the sampling system has high sensitivity by improving the power of the sampling pulse.
S3: the three paths of electric signals are converted by a first analog-to-digital converter 9, a second analog-to-digital converter 10 and a third analog-to-digital converter 11 respectively to obtain three paths of digital signals; the three paths of digital signals are input to the digital signal processing unit 100, and the analysis information of the eye diagram of the signal to be detected is obtained after signal analysis and processing.
Specifically, the specific processing steps performed by the digital signal processing unit 100 include:
s41: recovering the in-phase component I of the mixed signal by digital signal processingI(t) and the quadrature phase component IQ(t)；
S42: performing amplitude compensation on the two recovered signal signals;
wherein P represents the amplitude of the sample point, PSIs the optical power of the signal to be measured, PLIs the sampled optical pulse power;
s43: and extracting a peak point from the amplitude of the sampling point as an actual sampling value to ensure that the peak point is matched with the actual sampling point of the signal to be detected. Therefore, when the peak power of the sampling pulse is constant, the sampling peak point is always consistent with the power of the optical signal to be detected no matter how large the frequency offset and phase offset of the optical signal to be detected and the sampling optical pulse are;
s44: carrying out variance transformation on the extracted peak point
Fast Fourier transform to obtain coarse sampling period number S within S-0.5 and S +0.5]And performing linear frequency modulation Z conversion within the range to obtain accurate equivalent sampling period number, and then reconstructing an eye pattern of the signal to be measured and measuring the eye pattern.
In simulation test, 56GbaudPAM-4 optical signals to be tested with the wavelength of 1552.52nm and the peak power of 4mW are input into a sampling system, the pulse width of sampling optical pulses is adjusted to be 0.5ps, the repetition frequency is 100.19MHz, the peak power of the sampling optical pulses is stabilized at 4W, and the average power of local oscillation pulse light sources is-6 dBm at the moment. Adjusting the first polarization controller 3 and the second polarization controller 4 to make the polarization directions of the signal light and the sampling light pulse consistent, fig. 3 shows that the component recovery subunit 101 recovers the in-phase component and the quadrature-phase component of the mixed signal by using three digital signals, fig. 4 shows that 10000 sampling peak points are extracted by the peak extraction subunit 103, and fig. 5 shows a simulation result of eye diagram reconstruction of the 56gbaud pam-4 light signal obtained by the eye diagram reconstruction subunit 104.
In summary, the intensity modulated optical signal eye pattern measuring device based on linear optical sampling of the present application avoids the use of a 90 ° mixer and a balanced detector in the existing linear optical sampling device by using a 3 × 3 optical coupler and a single-ended photodetector, thereby reducing the cost of the linear optical sampling system; the repetition frequency of the sampling light pulse is far lower than the signal rate of the signal to be measured, and the accurate measurement of the eye pattern of the PAM-4 optical signal can be completed only by a photoelectric detector with 400MHz bandwidth and an analog-to-digital converter with 5GS/s sampling rate, so that the hardware requirement of the traditional electric domain measurement is greatly lower, and the hardware cost is reduced; the amplitude compensation of the signal is simple and reliable; the spectrum of the sampling optical pulse is fully overlapped with the spectrum of the signal to be detected, and when the 3dB bandwidth of the sampling pulse is more than twice of the signal to be detected, the multi-wavelength PAM-4 optical signal can be measured, the requirement on the power of the sampling optical pulse is low, the sampling optical pulse is insensitive to the frequency offset and the phase offset of the sampling pulse, and the requirement on a local oscillation pulse light source is reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The intensity modulation optical signal eye pattern measuring device based on linear optical sampling is characterized by comprising a signal input end (1) to be measured and a local oscillation pulse light source (2), wherein the signal input end (1) to be measured and the local oscillation pulse light source (2) are both connected to a 3 x 3 optical coupler (5), the output of the 3 x 3 optical coupler (5) is divided into three paths, the first path of output is connected to a digital signal processing unit (100) through a first photoelectric detector (6) and a first analog-to-digital converter (9), the second path of output is connected to the digital signal processing unit (100) through a second photoelectric detector (7) and a second analog-to-digital converter (10), and the third path of output is connected to the digital signal processing unit (100) through a third photoelectric detector (8) and a third analog-to-digital.
2. The intensity-modulated optical signal eye diagram measuring device based on linear optical sampling according to claim 1, wherein a first polarization controller (3) is connected between the input end (1) of the signal to be measured and the 3 x 3 optical coupler (5), and a second polarization controller (4) is connected between the local oscillator pulse light source (2) and the 3 x 3 optical coupler (5).
3. The linear light sampling based intensity modulated optical signal eye pattern measuring device according to any one of claims 1-2, wherein the digital signal processing unit (100) comprises a component recovery subunit (101), an amplitude compensation subunit (102), a peak extraction subunit (103), an eye pattern reconstruction subunit (104), and an eye pattern measurement subunit (105) which are connected in sequence;
the component recovery subunit (101) is used for recovering an in-phase component and a quadrature-phase component in the mixed signal;
the amplitude compensation subunit (102) is used for eliminating the influence of frequency offset and phase offset between the local oscillator pulse light and the intensity modulation optical signal to be detected;
the peak value extraction subunit (103) is used for extracting effective numerical value points which are consistent with the actual sampling points of the signals to be measured.
4. Linear light sampling based intensity modulated optical signal eye diagram measuring device according to claim 1, characterized in that the power splitting ratio of the 3 x 3 optical coupler (5) is 1:1: 1.
5. The linear light sampling based eye pattern measuring device for intensity modulated optical signals according to claim 1, wherein the first photodetector (6), the second photodetector (7), and the third photodetector (8) are all single-ended photodetectors.
6. The linear light sampling based intensity modulated light signal eye pattern measurement device of claim 1, wherein the first analog-to-digital converter (9), the second analog-to-digital converter (10), and the third analog-to-digital converter (11) are all low speed analog-to-digital converters.
7. The intensity modulation optical signal eye pattern measuring method based on linear light sampling is characterized by comprising the following steps:
s1: inputting the intensity modulation optical signal to be measured and the local oscillation pulse light source (2) into a 3 multiplied by 3 optical coupler (5) together for frequency mixing;
s2: the 3 x 3 optical coupler (5) outputs three paths of mixed optical signals which are respectively converted into three paths of electric signals by a first photoelectric detector (6), a second photoelectric detector (7) and a third photoelectric detector (8);
s3: the three paths of electric signals are converted by a first analog-to-digital converter (9), a second analog-to-digital converter (10) and a third analog-to-digital converter (11) respectively to obtain three paths of digital signals;
s4: the three paths of digital signals are input into a digital signal processing unit (100), and analysis information of the eye diagram of the signal to be detected is obtained after signal analysis and processing.
8. The method for measuring the eye diagram of the intensity modulated optical signal based on linear optical sampling according to claim 7, wherein the spectrum of the sampling optical pulse emitted by the local oscillator pulse optical source (2) in S1 substantially overlaps with the spectrum of the intensity modulated optical signal to be measured, and the 3dB bandwidth of the sampling optical pulse is greater than twice the bandwidth of the intensity modulated optical signal to be measured.
9. The method for eye measurement of an intensity modulated optical signal based on linear optical sampling according to claim 7, wherein the specific processing steps performed in the digital signal processing unit (100) in S4 comprise:
s41: restoring an in-phase component and a quadrature-phase component of the mixed signal through digital signal processing;
s42: performing amplitude compensation on the two recovered signal signals;
s43: extracting peak points from the amplitude values of the sampling points as actual sampling values;
s44: carrying out variance transformation and fast Fourier transformation on the extracted peak points to obtain an equivalent sampling period number S, and reconstructing an eye diagram of the signal to be detected;
s45: eye measurements are made from the reconstructed signal eye.
10. The method according to claim 9, wherein the number S of equivalent sampling cycles obtained by performing variance transformation and fast fourier transformation on the peak point in S44 is a coarse number S of sampling cycles, further performing chirp Z transformation within a range of [ S-0.5, S +0.5] to obtain an accurate number of equivalent sampling cycles, and reconstructing the eye pattern of the signal to be measured.
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| CN113824494A (en) * | 2021-10-29 | 2021-12-21 | 北京邮电大学 | Linear light sampling-based peak value extraction method and system |
| CN114024603A (en) * | 2021-11-19 | 2022-02-08 | 北京邮电大学 | Optical sampling analysis system based on pulse integration |
| CN115622843A (en) * | 2022-08-07 | 2023-01-17 | 北京理工大学 | Fast optical signal characterization method based on double-pulse frequency mixing |
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