CN111917486B - Coherent receiver phase angle detection method and device - Google Patents
Coherent receiver phase angle detection method and device Download PDFInfo
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
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Abstract
The invention discloses a method and a device for detecting a phase angle of a coherent receiver, wherein the method comprises the steps of obtaining an in-phase component signal and an orthogonal component signal sent by the coherent receiver; generating a coordinate graph according to the in-phase component signal and the quadrature component signal; determining whether the phase angle of the coherent receiver is normal according to the coordinate graph; the method can simply, effectively and accurately measure the phase angle of the coherent receiver, can quickly detect the phase angle under the condition of large phase noise, further quickly position the fault of the 90-degree frequency mixer of the receiver, judge the performance of the coherent receiver, and eliminate the coherent receiver with poor quality and possibly influencing the quality of a received signal, so that the coherent receiver is better applied to high-speed optical communication, particularly the field of long-distance transmission and high-order modulation.
Description
Technical Field
The invention relates to the technical field of high-speed optical communication, in particular to a method and a device for detecting a phase angle of a coherent receiver.
Background
The long-distance high-speed optical system mainly adopts a coherent light communication technology, a receiving end adopts a coherent demodulation technology, and a principle of a coherent receiver is that signal light is divided into two polarizations X and Y through a Polarization Beam Splitter (PBS), and at the moment, one local oscillator signal light needs to be provided and is respectively provided to 2 90-degree mixers through 3dB Beam splitters; at this time, under the condition that the Signal light and the local oscillator light have the same Frequency, the 90-degree mixer performs coherent demodulation to form an optical Signal with a 90-degree phase difference, the optical Signal is converted into photocurrent through high-speed Radio Frequency Predistortion (RFPD), the photocurrent is converted into an analog Signal through a high-bandwidth trans-impedance Amplifier (TIA), and the analog Signal is sent to a Digital Signal Processor (DSP) for detection; the 90-degree mixer realizes a 90-degree phase angle; in practical application, when a receiving end signal is degraded, the 90-degree phase angle is generally not completely orthogonal, especially when high-order modulation is performed, the requirement on the phase angle of a coherent receiver is high, a receiver with a completely orthogonal phase angle is required to perform communication of the receiving end, and the existing phase angle detection mode is one-dimensional detection, which is greatly influenced by phase noise of a light source device and has poor detection accuracy.
Disclosure of Invention
The invention mainly aims to provide a method and a device for detecting a phase angle of a coherent receiver, and aims to solve the technical problems that in the prior art, a phase angle detection mode is one-dimensional detection, the influence of phase noise of a light source device is large, and the detection precision is poor.
In a first aspect, the present invention provides a coherent receiver phase angle detection method, including the following steps:
acquiring an in-phase component signal and a quadrature component signal sent by a coherent receiver;
generating a coordinate graph according to the in-phase component signal and the quadrature component signal;
and determining whether the phase angle of the coherent receiver is normal according to the coordinate graph.
Optionally, the generating a coordinate graph from the in-phase component signal and the quadrature component signal includes:
dividing the in-phase component signal and the quadrature component signal according to a polarization direction;
and generating a coordinate graph according to the divided in-phase component signal and the divided quadrature component signal.
Optionally, the dividing the in-phase component signal and the quadrature component signal according to the polarization direction includes:
dividing the in-phase component signal according to the X polarization direction and the Y polarization direction to obtain an in-phase component X signal of the X polarization direction and an in-phase component Y signal of the Y polarization direction in the in-phase component signal;
and dividing the orthogonal component signals according to the X polarization direction and the Y polarization direction to obtain orthogonal component X signals of the X polarization direction and orthogonal component Y signals of the Y polarization direction in the orthogonal component signals.
Optionally, the generating a coordinate graph according to the divided in-phase component signal and quadrature component signal includes:
dividing the in-phase component X signal and the quadrature component X signal into one group, and dividing the in-phase component Y signal and the quadrature component Y signal into another group;
and marking the two groups of signals on preset XY coordinates to generate a coordinate graph.
Optionally, the determining whether the phase angle of the coherent receiver is normal according to the coordinate graph includes:
judging whether the coordinate graph is a perfect circle;
when the coordinate graph is in a perfect circle shape, judging that the phase angle of the coherent receiver is normal;
and when the coordinate graph is not in a perfect circle shape, judging that the phase angle of the coherent receiver is abnormal.
Optionally, after determining that the phase angle of the coherent receiver is abnormal when the coordinate graph is not a perfect circle, the coherent receiver phase angle detection method further includes:
acquiring a deviation angle between a long axis of the coordinate graph and a preset XY coordinate;
determining a phase difference of the phase angle of the coherent receiver according to the deviation angle;
and judging whether the coherent receiver has faults or not according to the phase difference.
In a second aspect, the present invention further provides a coherent receiver phase angle detection apparatus, including:
the analog-to-digital converter is used for acquiring an in-phase component signal and a quadrature component signal sent by the coherent receiver;
a data processor for generating a coordinate graph from the in-phase component signal and the quadrature component signal;
and the data processor is further used for determining whether the phase angle of the coherent receiver is normal or not according to the coordinate graph.
Optionally, the coherent receiver phase angle detection apparatus further includes:
and the laser is used for transmitting the local oscillation light and the signal light to the coherent receiver.
Optionally, the data processor is further configured to divide the in-phase component signal and the quadrature component signal according to a polarization direction, and generate a coordinate graph according to the divided in-phase component signal and quadrature component signal.
Optionally, the data processor is further configured to obtain a deviation angle between a long axis of the coordinate graph and a preset XY coordinate, determine a phase difference of the phase angle of the coherent receiver according to the deviation angle, and determine whether the coherent receiver has a fault according to the phase difference.
The invention provides a coherent receiver phase angle detection method, which comprises the steps of obtaining an in-phase component signal and an orthogonal component signal sent by a coherent receiver; generating a coordinate graph according to the in-phase component signal and the quadrature component signal; determining whether the phase angle of the coherent receiver is normal according to the coordinate graph; the method can simply, effectively and accurately measure the phase angle of the coherent receiver, can quickly detect the phase angle under the condition of large phase noise, further quickly position the fault of the 90-degree frequency mixer of the receiver, judge the performance of the coherent receiver, and eliminate the coherent receiver with poor quality and possibly influencing the quality of a received signal, so that the coherent receiver is better applied to high-speed optical communication, particularly the field of long-distance transmission and high-order modulation.
Drawings
FIG. 1 is a schematic flow chart of a phase angle detection method of a coherent receiver according to a first embodiment of the present invention;
FIG. 2 is a flow chart illustrating a second embodiment of a coherent receiver phase angle detection method according to the present invention;
FIG. 3 is a flow chart illustrating a third embodiment of a coherent receiver phase angle detection method according to the present invention;
FIG. 4 is a flow chart illustrating a fourth embodiment of a coherent receiver phase angle detection method according to the present invention;
FIG. 5 is a flow chart illustrating a fifth embodiment of a method for detecting a phase angle of a coherent receiver according to the present invention;
FIG. 6 is a schematic diagram of an angle deviation in the coherent receiver phase angle detection method according to the present invention;
fig. 7 is a functional block diagram of a coherent receiver phase angle detection apparatus according to a first embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The solution of the embodiment of the invention is mainly as follows: obtaining an in-phase component signal and a quadrature component signal sent by a coherent receiver; generating a coordinate graph according to the in-phase component signal and the quadrature component signal; determining whether the phase angle of the coherent receiver is normal according to the coordinate graph; the phase angle of the coherent receiver can be simply, effectively and accurately measured, the phase angle can be quickly detected under the condition of large phase noise, then the fault of a 90-degree frequency mixer of the receiver can be quickly positioned, the performance of the coherent receiver is judged, the coherent receiver with poor quality and possibly influencing the quality of a received signal is eliminated, the coherent receiver is better applied to high-speed optical communication, particularly the field of long-distance transmission and high-order modulation, and the technical problems that in the prior art, the phase angle detection mode is one-dimensional detection, the influence of the phase noise of a light source device is large, and the detection precision is poor are solved.
Referring to fig. 1, fig. 1 is a schematic flow chart of a coherent receiver phase angle detection method according to a first embodiment of the present invention.
In a first embodiment, the coherent receiver phase angle detection method comprises the steps of:
and step S10, acquiring an in-phase component signal and a quadrature component signal sent by the coherent receiver.
It should be noted that, after the optical signal is subjected to photoelectric conversion, there are an in-phase component signal and an orthogonal component signal, and the in-phase component and the orthogonal component of the modulation signal in a single polarization state are subjected to later-stage electric domain processing to solve bit information of original transmission data; under the condition of polarization multiplexing, coherent detection can be carried out by using a similar method, only two 90-degree frequency mixers are needed, and a received optical signal is divided into two beams of light with mutually vertical polarization directions, namely X-direction polarized light and Y-direction polarized light, by a polarization beam splitter; i.e., there will be an in-phase component signal and a quadrature component signal corresponding to the X-direction polarized light and the Y-direction polarized light.
In a specific implementation, the in-phase component signal and the quadrature component signal sent by the coherent receiver may be collected by an Analog-to-Digital Converter (ADC), but may also be collected by other devices or devices, for example, an optical power collecting device, and the like, which is not limited in this embodiment.
And step S20, generating a coordinate graph according to the in-phase component signal and the quadrature component signal.
It should be understood that, after the in-phase component signal and the quadrature component signal are obtained, the in-phase component and the quadrature component may be extracted, and then a corresponding coordinate map may be generated on the preset coordinates according to the in-phase component and the quadrature component.
And step S30, determining whether the phase angle of the coherent receiver is normal according to the coordinate graph.
It is to be understood that, after the coordinate graph is generated, the coordinate graph may be analyzed, and whether the phase angle of the coherent receiver is normal may be determined according to the analysis result, generally, whether the phase angle of the coherent receiver is normal may be determined according to the shape of the coordinate graph, and of course, whether the phase angle of the coherent receiver is normal may also be determined in other manners, for example, by determining the length of the long axis of the coordinate graph, which is not limited in this embodiment.
According to the scheme, the embodiment obtains the in-phase component signal and the orthogonal component signal sent by the coherent receiver; generating a coordinate graph according to the in-phase component signal and the quadrature component signal; determining whether the phase angle of the coherent receiver is normal according to the coordinate graph; the method can simply, effectively and accurately measure the phase angle of the coherent receiver, can quickly detect the phase angle under the condition of large phase noise, further quickly position the fault of the 90-degree frequency mixer of the receiver, judge the performance of the coherent receiver, and eliminate the coherent receiver with poor quality and possibly influencing the quality of a received signal, so that the coherent receiver is better applied to high-speed optical communication, particularly the field of long-distance transmission and high-order modulation.
Further, fig. 2 is a schematic flow chart of a second embodiment of the coherent receiver phase angle detection method of the present invention, and as shown in fig. 2, the second embodiment of the coherent receiver phase angle detection method of the present invention is proposed based on the first embodiment, and in this embodiment, the step S20 specifically includes the following steps:
step S21, dividing the in-phase component signal and the quadrature component signal according to the polarization direction.
It should be noted that the optical signal may be divided into two beams of light whose polarization directions are perpendicular to each other, that is, an X-direction polarized light and a Y-direction polarized light, after passing through the polarization beam splitter, where the polarization directions are the X-polarization direction and the Y-polarization direction, and the in-phase component signal and the quadrature component signal may be divided by the polarization directions.
And step S22, generating a coordinate graph according to the divided in-phase component signal and the divided quadrature component signal.
It is to be understood that, the in-phase component signal and the quadrature component signal after being divided can be subjected to coordinate processing to generate corresponding coordinate graphs, and the coordinate graphs generated by different in-phase component signals and quadrature component signals are different, where the coordinate graphs may be a graph in two-dimensional coordinates or a graph in Wie three-dimensional coordinates, which is not limited in this embodiment.
In this embodiment, by the above scheme, the in-phase component signal and the quadrature component signal are divided by a polarization direction; and generating a coordinate graph according to the divided in-phase component signal and the divided quadrature component signal, so that the phase angle of the coherent receiver can be simply, effectively and accurately measured, the phase angle can be quickly detected under the condition of high phase noise, and the performance detection speed and efficiency of the coherent receiver are accelerated.
Further, fig. 3 is a schematic flow chart of a third embodiment of the coherent receiver phase angle detection method of the present invention, and as shown in fig. 3, the third embodiment of the coherent receiver phase angle detection method of the present invention is provided based on the second embodiment, and in this embodiment, the step S21 specifically includes the following steps:
step S211, dividing the in-phase component signal according to the X polarization direction and the Y polarization direction, to obtain an in-phase component X signal in the X polarization direction and an in-phase component Y signal in the Y polarization direction in the in-phase component signal.
It can be understood that the polarization directions are an X polarization direction and a Y polarization direction, and the in-phase component signal is divided by the X polarization direction and the Y polarization direction, so as to obtain an in-phase component X signal and an in-phase component Y signal, that is, an in-phase component in the X polarization direction and an in-phase component in the Y polarization direction.
Step S212, dividing the orthogonal component signal according to the X polarization direction and the Y polarization direction, and obtaining an orthogonal component X signal in the X polarization direction and an orthogonal component Y signal in the Y polarization direction in the orthogonal component signal.
It should be understood that by dividing the orthogonal component signals by the X-polarization direction and the Y-polarization direction, orthogonal component X signals and orthogonal component Y signals, i.e., orthogonal components of the X-polarization direction and orthogonal components of the Y-polarization direction, can be obtained.
Correspondingly, the step S22 specifically includes the following steps:
step S221 of dividing the in-phase component X signal and the quadrature component X signal into one group, and dividing the in-phase component Y signal and the quadrature component Y signal into another group.
It is to be understood that the in-phase component X signal and the quadrature component X signal are grouped together, and the in-phase component Y signal and the quadrature component Y signal are grouped together, that is, signals in the X polarization direction are grouped together, and signals in the Y polarization direction are grouped together.
And step S222, marking the two groups of signals on preset XY coordinates to generate a coordinate graph.
It should be understood that a coordinate map can be generated on the preset XY coordinates by coordinate mapping the two sets of signals, the preset XY coordinates being a preset initial coordinate system, and the coordinate map can be obtained by coordinating in-phase components and quadrature components in the two sets of signals.
In a specific implementation, the high-speed ADC acquires an in-phase component signal and an orthogonal component signal, that is, an in-phase component X signal, an orthogonal component X signal, an in-phase component Y signal, and an orthogonal component Y signal, which are sent by the coherent receiver, and divides the in-phase component X signal and the orthogonal component X signal into a group, and divides the in-phase component Y signal and the orthogonal component Y signal into a group, and marks the group on a preset XY coordinate, so that a two-dimensional XY coordinate graph can be formed.
According to the scheme, the in-phase component signal is divided according to the X polarization direction and the Y polarization direction, so that an in-phase component X signal in the X polarization direction and an in-phase component Y signal in the Y polarization direction in the in-phase component signal are obtained; dividing the orthogonal component signals according to the X polarization direction and the Y polarization direction to obtain orthogonal component X signals of the X polarization direction and orthogonal component Y signals of the Y polarization direction in the orthogonal component signals; dividing the in-phase component X signal and the quadrature component X signal into one group, and dividing the in-phase component Y signal and the quadrature component Y signal into another group; the two groups of signals are marked on the preset XY coordinates to generate a coordinate graph, so that the phase angle of the coherent receiver can be simply, effectively and accurately measured, the phase angle can be quickly detected under the condition of large phase noise, and the performance of the coherent receiver can be quickly judged.
Further, fig. 4 is a schematic flowchart of a fourth embodiment of the coherent receiver phase angle detection method of the present invention, and as shown in fig. 4, the fourth embodiment of the coherent receiver phase angle detection method of the present invention is provided based on the first embodiment, and in this embodiment, the step S30 specifically includes the following steps:
and step S31, judging whether the coordinate graph is a perfect circle.
It should be noted that, by grouping the in-phase component X signal and the quadrature component X signal into one group, and grouping the in-phase component Y signal and the quadrature component Y signal into one group, after a coordinate diagram is generated on a preset XY coordinate, a perfect circle appears under normal conditions, which indicates that the phases are orthogonal.
And step S32, when the coordinate graph is a perfect circle, determining that the phase angle of the coherent receiver is normal.
It is understood that when the graph is perfect circle, i.e. the phases are illustrated as being orthogonal, the phase angle of the coherent receiver can be determined to be normal.
Step S33, when the graph is not perfect circle, determining that the phase angle of the coherent receiver is abnormal.
It should be understood that when the graph is not perfectly circular, i.e., indicates that the phase is not orthogonal at this time, and is generally elliptical, it may be determined that the phase angle of the coherent receiver is abnormal.
According to the scheme, whether the coordinate graph is a perfect circle is judged; when the coordinate graph is in a perfect circle shape, judging that the phase angle of the coherent receiver is normal; when the coordinate graph is not in a perfect circle shape, the phase angle of the coherent receiver is judged to be abnormal, the 90-degree mixer fault of the receiver can be quickly positioned, the performance of the coherent receiver is judged, the coherent receiver with poor quality and possibly influencing the quality of a received signal is eliminated, and the coherent receiver is better applied to high-speed optical communication, particularly the field of long-distance transmission and high-order modulation.
Further, fig. 5 is a schematic flowchart of a fifth embodiment of the coherent receiver phase angle detection method according to the present invention, and as shown in fig. 5, the fifth embodiment of the coherent receiver phase angle detection method according to the present invention is proposed based on the fourth embodiment, in this embodiment, after the step S33, the coherent receiver phase angle detection method further includes the following steps:
and step S34, acquiring the deviation angle between the long axis of the coordinate graph and the preset XY coordinates.
It should be noted that the long axis of the coordinate graph is a longest line segment that can be obtained by connecting two points on the coordinate graph in the coordinate graph, and whether the coherent receiver fails can be determined by obtaining a deviation angle between the long axis of the coordinate graph and a preset XY coordinate, that is, an included angle between the long axis of the coordinate graph and the preset XY coordinate.
In a specific implementation, fig. 6 is a schematic diagram of a deviation angle in the coherent receiver phase angle detection method of the present invention, as shown in fig. 6, a high-speed ADC acquires an in-phase component signal and an orthogonal component signal sent by a coherent receiver, that is, an in-phase component X polarization direction signal XI, an orthogonal component X polarization direction signal XQ, an in-phase component Y polarization direction signal YI, and an orthogonal component Y polarization direction signal YQ, where when the coordinate diagram is a perfect circle, it is indicated that the phases are orthogonal, that is, the phase angle of the coherent receiver can be determined to be normal, when the coordinate diagram is not a perfect circle, it is indicated that the phases are not orthogonal, that is, an ellipse in the diagram, and an included angle between a major axis of the ellipse and a preset XY coordinate is a deviation angle.
And step S35, determining the phase difference of the phase angle of the coherent receiver according to the deviation angle.
It can be understood that after the deviation angle is obtained, the phase difference may be quantified through the deviation angle, specifically, the phase difference may be obtained by searching according to a preset mapping table of the deviation angle and the phase difference, or may be obtained by calculating through a preset phase difference calculation equation, or of course, the phase difference of the phase angle of the coherent receiver may also be obtained through other manners, which is not limited in this embodiment.
And step S36, judging whether the coherent receiver has faults according to the phase difference.
It should be appreciated that it may be determined whether the phase difference is within an allowable range based on a comparison of the phase difference with a preset phase difference threshold, and if so, determining that the coherent receiver is not faulty, and if not, indicating that the coherent receiver is faulty; of course, the manner of determining whether the coherent receiver is faulty according to the phase difference is not limited to the above one, and it may also be determined that the coherent receiver is faulty if there is a phase difference, or it may also be determined that the coherent receiver is faulty if an average value of a plurality of phase differences is calculated through multiple measurements and then compared with a preset phase difference threshold, and then it is determined whether the coherent receiver is faulty, which is not limited in this embodiment.
According to the scheme, the deviation angle between the long axis of the coordinate graph and the preset XY coordinate is obtained; determining a phase difference of the phase angle of the coherent receiver according to the deviation angle; and judging whether the coherent receiver has faults according to the phase difference, quickly positioning the faults of the 90-degree mixer of the receiver, judging the performance of the coherent receiver, and eliminating the coherent receiver with poor quality which possibly influences the quality of a received signal, so that the coherent receiver is better applied to high-speed optical communication, particularly the field of long-distance transmission and high-order modulation.
Correspondingly, the invention further provides a phase angle detection device of the coherent receiver.
Referring to fig. 7, fig. 7 is a functional block diagram of a coherent receiver phase angle detection apparatus according to a first embodiment of the present invention.
In a first embodiment of the coherent receiver phase angle detection apparatus of the present invention, the coherent receiver phase angle detection apparatus includes:
an analog-to-digital converter 10 is used to obtain the in-phase component signal and the quadrature component signal from the coherent receiver 20.
It should be noted that the Coherent Receiver may be an Integrated Coherent Receiver (ICR), or may be other types of Coherent receivers, which is not limited in this embodiment; after the optical signal is subjected to photoelectric conversion, an in-phase component signal and an orthogonal component signal exist, and the in-phase component and the orthogonal component of the modulation signal in a single polarization state can be solved after the in-phase component and the orthogonal component of the modulation signal are subjected to later-stage electric domain processing; under the condition of polarization multiplexing, coherent detection can be carried out by using a similar method, only two 90-degree frequency mixers are needed, and a received optical signal is divided into two beams of light with mutually vertical polarization directions, namely X-direction polarized light and Y-direction polarized light, by a polarization beam splitter; i.e., there will be an in-phase component signal and a quadrature component signal corresponding to the X-direction polarized light and the Y-direction polarized light.
In a specific implementation, the Analog-to-Digital Converter (ADC) is used to collect the in-phase component signal and the quadrature component signal sent by the coherent receiver, but it may also be used to collect the in-phase component signal and the quadrature component signal of the coherent receiver by other devices or devices, such as an optical power collecting device, and the embodiment is not limited thereto.
A data processor 30 for generating a coordinate plot from the in-phase component signal and the quadrature component signal.
It should be understood that, after the in-phase component signal and the quadrature component signal are obtained, the in-phase component and the quadrature component may be extracted, and then a corresponding coordinate map may be generated on the preset coordinates according to the in-phase component and the quadrature component.
The data processor 30 is further configured to determine whether the phase angle of the coherent receiver 20 is normal according to the graph.
It is to be understood that, after the coordinate graph is generated, the coordinate graph may be analyzed, and whether the phase angle of the coherent receiver is normal may be determined according to the analysis result, generally, whether the phase angle of the coherent receiver is normal may be determined according to the shape of the coordinate graph, and of course, whether the phase angle of the coherent receiver is normal may also be determined in other manners, for example, by determining the length of the long axis of the coordinate graph, which is not limited in this embodiment.
Further, the coherent receiver phase angle detection apparatus further includes:
and a laser 40 for transmitting the local oscillator light and the signal light to the coherent receiver 20.
It should be understood that the light source may be generated by two lasers and transmitted to the coherent receiver, and that two lasers may transmit local oscillator light and signal light to the coherent receiver, respectively.
Further, the data processor 30 is further configured to divide the in-phase component signal and the quadrature component signal according to a polarization direction, and generate a coordinate graph according to the divided in-phase component signal and quadrature component signal.
It should be noted that the optical signal may be divided into two beams of light whose polarization directions are perpendicular to each other, that is, an X-direction polarized light and a Y-direction polarized light, after passing through the polarization beam splitter, where the polarization directions are the X-polarization direction and the Y-polarization direction, and the in-phase component signal and the quadrature component signal may be divided by the polarization directions.
It is to be understood that, the in-phase component signal and the quadrature component signal after being divided can be subjected to coordinate processing to generate corresponding coordinate graphs, and the coordinate graphs generated by different in-phase component signals and quadrature component signals are different, where the coordinate graphs may be a graph in two-dimensional coordinates or a graph in Wie three-dimensional coordinates, which is not limited in this embodiment.
In a specific implementation, the in-phase component signal may be divided by an X polarization direction and a Y polarization direction, so as to obtain an in-phase component X signal and an in-phase component Y signal, that is, an in-phase component in the X polarization direction and an in-phase component in the Y polarization direction; dividing the orthogonal component signals according to the X polarization direction and the Y polarization direction to obtain orthogonal component X signals and orthogonal component Y signals, namely orthogonal components in the X polarization direction and orthogonal components in the Y polarization direction; dividing the in-phase component X signal and the orthogonal component X signal into one group, dividing the in-phase component Y signal and the orthogonal component Y signal into another group, generating a coordinate graph on the preset XY coordinate by performing coordinate mapping on the two groups of signals, wherein the preset XY coordinate is a preset initial coordinate system, and the in-phase component and the orthogonal component in the two groups of signals are coordinated to obtain the coordinate graph.
Further, the data processor is further configured to obtain a deviation angle between a long axis of the coordinate graph and a preset XY coordinate, determine a phase difference of the phase angle of the coherent receiver according to the deviation angle, and determine whether the coherent receiver has a fault according to the phase difference.
It should be noted that the long axis of the coordinate graph is a longest line segment that can be obtained by connecting two points on the coordinate graph in the coordinate graph, and whether the coherent receiver fails can be determined by obtaining a deviation angle between the long axis of the coordinate graph and a preset XY coordinate, that is, an included angle between the long axis of the coordinate graph and the preset XY coordinate.
It can be understood that after the deviation angle is obtained, the phase difference may be quantified through the deviation angle, specifically, the phase difference may be obtained by searching according to a preset mapping table of the deviation angle and the phase difference, or may be obtained by calculating through a preset phase difference calculation equation, or of course, the phase difference of the phase angle of the coherent receiver may also be obtained through other manners, which is not limited in this embodiment.
It should be appreciated that it may be determined whether the phase difference is within an allowable range based on a comparison of the phase difference with a preset phase difference threshold, and if so, determining that the coherent receiver is not faulty, and if not, indicating that the coherent receiver is faulty; of course, the manner of determining whether the coherent receiver is faulty according to the phase difference is not limited to the above one, and it may also be determined that the coherent receiver is faulty if there is a phase difference, or it may also be determined that the coherent receiver is faulty if an average value of a plurality of phase differences is calculated through multiple measurements and then compared with a preset phase difference threshold, and then it is determined whether the coherent receiver is faulty, which is not limited in this embodiment.
According to the scheme, the in-phase component signal and the quadrature component signal sent by the coherent receiver are obtained through the analog-to-digital converter; the data processor generates a coordinate graph according to the in-phase component signal and the quadrature component signal; the data processor determines whether the phase angle of the coherent receiver is normal according to the coordinate graph; the method can simply, effectively and accurately measure the phase angle of the coherent receiver, can quickly detect the phase angle under the condition of large phase noise, further quickly position the fault of the 90-degree frequency mixer of the receiver, judge the performance of the coherent receiver, and eliminate the coherent receiver with poor quality and possibly influencing the quality of a received signal, so that the coherent receiver is better applied to high-speed optical communication, particularly the field of long-distance transmission and high-order modulation.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred 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 using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A coherent receiver phase angle detection method, comprising:
acquiring in-phase component signals and orthogonal component signals which are transmitted by a coherent receiver and subjected to photoelectric conversion in a polarization state;
generating a coordinate graph according to the in-phase component signal and the quadrature component signal;
determining whether the phase angle of the coherent receiver is normal according to the coordinate graph;
wherein the generating a coordinate graph from the in-phase component signal and the quadrature component signal comprises:
dividing the in-phase component signal and the quadrature component signal according to a polarization direction;
generating a coordinate graph according to the divided in-phase component signal and the divided quadrature component signal;
wherein the dividing the in-phase component signal and the quadrature component signal according to polarization direction comprises:
dividing the in-phase component signal according to the X polarization direction and the Y polarization direction to obtain an in-phase component X signal of the X polarization direction and an in-phase component Y signal of the Y polarization direction in the in-phase component signal;
dividing the orthogonal component signals according to the X polarization direction and the Y polarization direction to obtain orthogonal component X signals of the X polarization direction and orthogonal component Y signals of the Y polarization direction in the orthogonal component signals;
wherein the generating a coordinate graph from the divided in-phase component signal and quadrature component signal comprises:
dividing the in-phase component X signal and the quadrature component X signal into one group, and dividing the in-phase component Y signal and the quadrature component Y signal into another group;
and marking the two groups of signals on preset XY coordinates to generate a coordinate graph.
2. The coherent receiver phase angle detection method of claim 1, wherein said determining from the graph whether the phase angle of the coherent receiver is normal comprises:
judging whether the coordinate graph is a perfect circle;
when the coordinate graph is in a perfect circle shape, judging that the phase angle of the coherent receiver is normal;
and when the coordinate graph is not in a perfect circle shape, judging that the phase angle of the coherent receiver is abnormal.
3. The coherent receiver phase angle detection method according to claim 2, wherein after determining that the phase angle of the coherent receiver is abnormal when the coordinate diagram is not a perfect circle, the coherent receiver phase angle detection method further comprises:
acquiring a deviation angle between a long axis of the coordinate graph and a preset XY coordinate;
determining a phase difference of the phase angle of the coherent receiver according to the deviation angle;
and judging whether the coherent receiver has faults or not according to the phase difference.
4. A coherent receiver phase angle detection apparatus, comprising:
the analog-to-digital converter is used for acquiring in-phase component signals and orthogonal component signals which are transmitted by the coherent receiver and subjected to photoelectric conversion in a polarization state;
a data processor for generating a coordinate graph from the in-phase component signal and the quadrature component signal;
a data processor further configured to determine whether a phase angle of the coherent receiver is normal based on the graph;
the analog-to-digital converter is further configured to divide the in-phase component signal and the quadrature component signal according to a polarization direction; generating a coordinate graph according to the divided in-phase component signal and the divided quadrature component signal;
the analog-to-digital converter is further configured to divide the in-phase component signal according to an X polarization direction and a Y polarization direction, so as to obtain an in-phase component X signal in the X polarization direction and an in-phase component Y signal in the Y polarization direction in the in-phase component signal; dividing the orthogonal component signals according to the X polarization direction and the Y polarization direction to obtain orthogonal component X signals of the X polarization direction and orthogonal component Y signals of the Y polarization direction in the orthogonal component signals;
the analog-to-digital converter is further configured to divide the in-phase component X signal and the quadrature component X signal into one group, and divide the in-phase component Y signal and the quadrature component Y signal into another group; and marking the two groups of signals on preset XY coordinates to generate a coordinate graph.
5. The coherent receiver phase angle detection apparatus of claim 4, further comprising:
and the laser is used for transmitting the local oscillation light and the signal light to the coherent receiver.
6. The coherent receiver phase angle detection apparatus of claim 4, wherein the data processor is further configured to obtain a deviation angle of a major axis of the coordinate graph from a preset XY coordinate, determine a phase difference of the coherent receiver phase angle according to the deviation angle, and determine whether the coherent receiver is faulty according to the phase difference.
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