CN114244430A - Method and device for detecting quality of EDFA optical signal - Google Patents

Method and device for detecting quality of EDFA optical signal Download PDF

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CN114244430A
CN114244430A CN202111550329.1A CN202111550329A CN114244430A CN 114244430 A CN114244430 A CN 114244430A CN 202111550329 A CN202111550329 A CN 202111550329A CN 114244430 A CN114244430 A CN 114244430A
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filter
optical
edfa
output
optical power
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CN114244430B (en
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万琼
张伟
辜勇
陈志�
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Accelink Technologies Co Ltd
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Accelink Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0777—Monitoring line amplifier or line repeater equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0771—Fault location on the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0791—Fault location on the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07955—Monitoring or measuring power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07957—Monitoring or measuring wavelength

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses a method and a device for detecting the quality of an EDFA optical signal, wherein the method comprises the following steps: an output light path of the EDFA splits light, and leads optical signals split by a main light path into an in-band filter in a communication channel and an out-of-band filter in a non-communication channel to respectively detect optical power; obtaining output end single-wave light power according to the total light power of the EDFA output light path and the number of channels where the EDFA is located; and judging whether the output optical signal of the EDFA is normal or not according to the output end single-wave optical power and the optical power of the output optical paths of the in-band filter and the out-of-band filter. The invention can detect the power of the optical signals in-band and out-of-band at the output end of the EDFA in real time, judge whether the optical power output of the EDFA in the communication channel wave band is normal or not by detecting the optical power in-band or out-of-band, quickly judge the signal quality of each EDFA, and quickly and effectively position the fault position in the EDFA cascade link.

Description

Method and device for detecting quality of EDFA optical signal
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a method and a device for detecting the quality of an EDFA optical signal.
Background
Erbium-doped Fiber amplifiers (EDFAs) have the advantages of high gain, high output power, low noise and the like, and are increasingly widely applied to digital communication, Optical Fiber cable television systems and dense wavelength division systems. When the amplifier is in use, whether the output power of the erbium-doped fiber amplifier can reach the target output or not and whether the gain of an optical signal reaches a set value or not are evaluated according to the standard of normal operation. In order to detect the two indexes, the optical amplifier detects the output power in real time and calculates the actual gain of the optical amplifier.
In dense wavelength division multiplexing systems, erbium doped fiber amplifiers are often used in cascade to overcome interstage losses. In the process of amplifying signals by cascading a plurality of erbium-doped fiber amplifiers, the phenomenon of fiber breakage of individual erbium-doped fiber amplifiers or failure of individual PUMP lasers (PUMPs) (for example, failure of the first PUMP of a dual-core PUMP) inevitably occurs, but at this time, the erbium-doped fiber amplifiers can still work and output stably, the calculated optical signal gain may also be normal, the output of the erbium-doped fiber amplifiers is only noise, and the optical signal-to-noise ratio of the whole link is rapidly degraded, so that the bit error rate (Pe) of a receiving end is affected.
Under the above situation, in order to further confirm which erbium-doped fiber amplifier works abnormally, the network manager may query the input/output powers of all cascaded erbium-doped fiber amplifiers of the entire link and whether the PUMP backlight current has an alarm abnormality. However, since the dual-core PUMPs share one backlight current, it is not possible to directly determine whether a PUMP is disabled from the backlight current, and thus it is difficult to quickly determine and locate the cause of the abnormality of the system Pe.
In view of the above, overcoming the drawbacks of the prior art is an urgent problem in the art.
Disclosure of Invention
In view of the above defects or improvement needs of the prior art, the present invention provides a method and an apparatus for detecting the quality of an EDFA optical signal, which aim to detect the optical power of a communication channel and a non-communication channel at the output end of an EDFA, respectively, thereby solving the technical problem of how to quickly determine the fault location and cause in an EDFA cascade system.
To achieve the above object, according to an aspect of the present invention, there is provided a method of detecting quality of an EDFA optical signal, the method including:
an output light path of the EDFA splits light, and leads optical signals split by a main light path into an in-band filter in a communication channel and an out-of-band filter in a non-communication channel to respectively detect optical power;
obtaining output end single-wave light power according to the total light power of the EDFA output light path and the number of channels where the EDFA is located;
and judging whether the output optical signal of the EDFA is normal or not according to the output end single-wave optical power and the optical power of the output optical paths of the in-band filter and the out-of-band filter.
Preferably, the output optical path of the EDFA splits light, and introduces the optical signal split by the main optical path into an in-band filter in the communication channel and an out-of-band filter in the non-communication channel to perform optical power detection, respectively, where the specific method includes:
an output light path of the EDFA is divided into a main light path and a secondary light path through primary light splitting, and the main light path transmits an optical signal to the EDFA at the next stage;
the secondary optical path is divided into a first optical path and a second optical path through secondary light splitting, the optical power of the first optical path is greater than that of the second optical path, and the total optical power of the EDFA output optical path is obtained according to the optical power of the second optical path;
the first optical path equally divides the optical path into a plurality of detection optical paths through three-time light splitting, and the equally divided detection optical paths are respectively led into the in-band filter and the out-of-band filter to detect the optical power.
Preferably, the in-band filter comprises a first filter and a second filter, wherein:
the center wavelengths of the first filter and the second filter are arranged in a communication channel of the EDFA, and the center wavelengths of the first filter and the second filter are separated by a preset bandwidth.
Preferably, the out-of-band filter comprises a third filter and a fourth filter, wherein:
the center wavelength of the third filter is set to be the middle value of the working wavelengths of the first filter and the second filter, the center wavelength of the fourth filter is set to be outside the EDFA communication waveband, and the distance between the center wavelengths of the third filter and the fourth filter is a preset bandwidth.
Preferably, the determining whether the output optical signal of the EDFA is normal according to the single-wave optical power at the output end and the optical powers of the in-band filter and the out-of-band filter output optical paths includes:
after the detection light path passes through the first filter, the second filter, the third filter and the fourth filter, the optical power output by the first filter is recorded as Pλ1The optical power output by the second filter is denoted as Pλ2And the optical power output by the third filter is recorded as Pλ3The optical power output by the fourth filter is denoted as Pλ4；
Setting a first preset threshold and a second preset threshold, and judging the output end single-wave optical power and the Pλ1And said Pλ2Whether the difference value of (A) is less than or equal to a first preset threshold value simultaneously, and the output end single-wave optical power and the Pλ3And said Pλ4Whether the difference value is greater than or equal to a second preset threshold value or not, if so, the output optical signal of the EDFA is normal.
Preferably, the first preset threshold is a maximum optical power difference between communication channels in the DWDM system where the EDFA output light is located, and the second preset threshold is an extinction ratio of the EDFA output light.
According to another aspect of the present invention, there is provided an apparatus for detecting the quality of an EDFA optical signal, the apparatus comprising an EDFA assembly 1, a splitter assembly 2, a filter assembly 3, a photodetection assembly 4 and a control unit 5, wherein:
the optical splitter component 2 is arranged between the EDFA components 1, optical signals are transmitted between the EDFA components 1 on a main optical path, and the filter component 3 and the photoelectric detection component 4 are arranged on a secondary optical path;
the photoelectric detection component 4 detects the optical power of the EDFA output optical path and the optical power output by the filter component 3;
the control unit 5 determines whether the output optical signal of the EDFA component 1 is normal by calculating a difference between the optical power of the EDFA output optical path and the output optical power of the filter component 3.
Preferably, the optical splitter assembly 2 comprises a first optical splitter 21, a second optical splitter 22 and a third optical splitter 23, wherein:
the first optical splitter 21 is arranged between the EDFA assemblies 1, and the optical path is split into a main optical path and a secondary optical path by the first optical splitter 21;
the second optical splitter 22 is disposed on the secondary optical path, the secondary optical path is divided into a first optical path and a second optical path by the second optical splitter 22, the first photodetector 41 in the photodetection component 4 is disposed on the second optical path, and the total optical power of the EDFA output optical path is obtained from the optical power detected by the first photodetector 41;
the third optical splitter 23 is disposed on the first optical path, the third optical splitter 23 equally divides the first optical path into a plurality of detection optical paths, the detection optical paths are guided into the filter component 3 and respectively connected with the detector of the photoelectric detection component 4 to detect the optical power of each optical path, and the optical power of each detection optical path is P λiWherein i represents the number of each detection light path.
Preferably, the filter assembly 3 comprises a first filter 31, a second filter 32, a third filter 33 and a fourth filter 34, wherein:
the first filter 31 and the second filter 32 are located in a communication channel, and the center wavelengths of the first filter and the second filter are separated by a preset bandwidth;
the third filter 33 and the fourth filter 34 are located in a non-communication channel, the center wavelength of the third filter is set to be the middle value of the operating wavelengths of the first filter and the second filter, the center wavelength of the fourth filter is set to be outside the EDFA communication band, and the center wavelengths of the third filter and the fourth filter are separated by a preset bandwidth;
the center wavelengths of the first filter 31, the second filter 32 and the third filter 33 are all within the communication band of the EDFA.
Preferably, the photo detection assembly 4 comprises a first detector 41, a second detector 42, a third detector 43, a fourth detector 44 and a fifth detector 45, wherein:
the first detector 41 detects the optical power on the second optical path, and the optical power detected by the first photodetector 41 obtains the optical power of the EDFA output optical path;
the second detector 42, the third detector 43, the fourth detector 44 and the fifth detector 45 are respectively connected to the detection optical paths passing through the first filter 31, the second filter 32, the third filter 33 and the fourth filter 34.
Generally, compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the method and the device for detecting the quality of the EDFA optical signals can detect the power of the optical signals in the output end band and out of the band of the EDFA in real time, judge whether the optical power output of the EDFA in the communication channel wave band is normal or not after detecting the optical power in the band or out of the band, quickly judge the signal quality of each EDFA, and quickly and effectively position fault positions in an EDFA cascade link.
Drawings
Fig. 1 is a schematic flow chart of a method for detecting the quality of an EDFA optical signal according to the present invention;
FIG. 2 is a schematic diagram of an apparatus for detecting the quality of an EDFA optical signal according to the present invention;
fig. 3 is a schematic diagram of an apparatus for detecting the quality of an EDFA optical signal according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the description of the present invention, the terms "inner", "outer", "longitudinal", "lateral", "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are for convenience only to describe the present invention without requiring the present invention to be necessarily constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The first embodiment is as follows:
in this embodiment, a method for detecting quality of an EDFA optical signal is provided, as shown in fig. 1, the method includes the following steps:
and S101, an output light path of the EDFA guides the optical signal split by the main light path into an in-channel filter in the communication channel and an out-channel filter in the non-communication channel for optical power detection respectively through light splitting.
As shown in fig. 2, the output end of the EDFA is divided into two paths by the first optical splitter 21, the large-end optical power of the first optical splitter 21 is used as service light and output to the next EDFA, and the small-end optical power is split by the second optical splitter 22 for the second time. In practical applications, the splitting ratio of the first splitter 21 can be selected according to requirements, and in this embodiment, is selected to be between 1% and 10%. The light split from the small end of the first optical splitter 21 is split for the second time by the second optical splitter 22, the small end optical power of the second optical splitter 22 is used for amplifying service light output detection to control the gain of the EDFA, the total optical power of the EDFA output optical path can be derived from the small end optical power of the second optical splitter 22, the optical power of the EDFA output optical path is recorded as Pout, and the large end optical power of the second optical splitter 22 is split for the third time by the third optical splitter 23. In practical applications, the splitting ratio of the second splitter 22 can be selected according to requirements, and in this embodiment, is selected to be between 10% and 50%. The light power at the large end of the second optical splitter 22 is split for three times by the third optical splitter 23 and then divided into four detection light paths, the detection light paths respectively detect the light power in and out of the channel, and the third optical splitter 23 can be selected according to requirements, and can be a 1X4 optical splitter or a combination of several optical splitters. The four detection light paths respectively pass through a narrow channel filter and carry out power detection.
And S102, obtaining the output end single-wave optical power according to the total optical power of the output optical path of the EDFA and the number of the channels on which the EDFA works.
The total optical power of the output optical path of the EDFA is derived from the small-end optical power of the second optical splitter 22, the total optical power of the output optical path of the EDFA is denoted as Pout, the single-wave optical power of the output end is denoted as Pout _ single, and the Pout _ single is calculated in a manner that Pout _ single is Pout-10 × logN, where N is the number of communication channels, and in this embodiment, the number of communication channels is 48.
The selection of the number of communication channels complies with the specification of International Telecommunication Union, ITU for short, ITU defines the Wavelength commonly used by Dense Wavelength Division Multiplexing, DWDM system for short, referred to as ITU Wavelength, and the C-band DWDM system is now commonly used: the three wave bands are C-band, 80-wave 40-wave system, 96-wave 48-wave system and 120-wave 60-wave system, but the specific wavelength ranges are different. The DWDM system with the C wave band 50GHz interval corresponding to 80 waves, 96 waves and 120 waves, the DWDM system with the C wave band 100GHz interval corresponding to 40 waves, 48 waves and 60 waves, and the C wave bands corresponding to 40 waves, 48 waves and 60 waves are respectively consistent with the wavelength of the DWDM system with the C wave band 50GHz interval corresponding to 80 waves, 96 waves and 120 waves.
And S103, judging whether the output optical signal of the EDFA is normal or not according to the output end single-wave optical power and the optical power of the output optical paths of the in-band filter and the out-of-band filter.
Recording the single-wave optical power of the output end as Pout _ single, and respectively connecting the single-wave optical power with the output light lambda in the channel1Optical power Pλ1In-channel output light lambda2Optical power Pλ2Output light lambda outside the channel3Optical power Pλ3Output light lambda outside the channel4Optical power Pλ4The single-wave light power of the output end is respectively differenced with the light power of the four output lights, the power difference is calculated, and the absolute value delta P is takenλi，ΔPλi＝|Pout_single-PλiWhere i ═ 1,2,3,4, Δ Pλ1，ΔPλ2Respectively representing the power of the single wave light and the in-band output light lambda1，λ2Absolute value of difference in optical power, Δ Pλ3，ΔPλ4Respectively representing single wave optical power and out-of-band output light lambda3，λ4Absolute value of the optical power difference.
In this embodiment, in order to detect whether optical power in a communication channel is normal and whether there is output light in a non-communication channel, respectively, in combination with the embodiment of the present invention, there is also a preferred implementation scheme, specifically, as shown in fig. 2, an output optical path of the EDFA splits light, and introduces an optical signal split by a main optical path into an in-band filter in the communication channel and an out-of-band filter in the non-communication channel to detect optical power, respectively, where the specific method includes:
and an output light path of the EDFA is divided into a main light path and a secondary light path through primary light splitting, and the main light path transmits light signals to the EDFA at the next stage.
The output end of the EDFA is divided into two paths by using the first optical splitter 21, the large-end optical power of the first optical splitter 21 is used as service light and output to the next-stage EDFA, and the small-end optical power is split by the second optical splitter 22 for the second time. In practical applications, the splitting ratio of the first splitter 21 can be selected according to requirements, and in this embodiment, is selected to be between 1% and 10%.
The secondary optical path is divided into a first optical path and a second optical path through secondary light splitting, the optical power of the first optical path is greater than that of the second optical path, and the total optical power of the EDFA output optical path is obtained according to the optical power of the second optical path.
The light split from the small end of the first optical splitter 21 is split for the second time by the second optical splitter 22, the small end optical power of the second optical splitter 22 is used for amplifying the service light output detection to control the gain of the EDFA, the total optical power of the EDFA output optical path can be derived from the small end optical power of the second optical splitter 22, and the optical power of the EDFA output optical path is recorded as Pout. The output single-wave optical power is recorded as Pout _ single, and Pout _ single is calculated in a manner that Pout _ single is Pout-10 log N, where N is the number of communication channels, and in this embodiment, the number of communication channels is 48.
The first optical path equally divides the optical path into a plurality of detection optical paths through three-time light splitting, and the equally divided detection optical paths are respectively led into the in-band filter and the out-of-band filter to detect the optical power.
After the detection light path passes through the first filter, the second filter, the third filter and the fourth filter, the optical power output by the first filter is recorded as Pλ1The optical power output by the second filter is denoted as Pλ2And the optical power output by the third filter is recorded as Pλ3The optical power output by the fourth filter is denoted as Pλ4；
Setting a first preset threshold and a second preset threshold, and judging the output end single-wave optical power and the Pλ1And said Pλ2Whether the difference value of (A) is less than or equal to a first preset threshold value simultaneously, and the output end single-wave optical power and the Pλ3And said Pλ4Whether the difference value is greater than or equal to a second preset threshold value or not, if so, the output optical signal of the EDFA is normal.
The first light splitting is to output a large part of light to the next EDFA, a small part of light is used for detection, and the total output light Pout needs to be detected, so that the second light splitting is needed, and the third light splitting is to detect the optical power P of 4 channels as accurately as possibleλiIf there is no third time splitting, the filter is directly connected for detection, and each channel is relatively close to each other, the respective filters may attenuate the optical power of other channels, and the attenuation amounts are not uniform, which may affect PλiLeading to erroneous judgment of the quality of the output optical signal.
In this embodiment, in order to detect whether output light of an EDFA in a communication channel is normal, in combination with the embodiment of the present invention, there is also a preferred implementation, specifically, as shown in fig. 2, the in-band filter includes a first filter and a second filter, where:
the center wavelengths of the first filter and the second filter are arranged in a communication channel of the EDFA, and the center wavelengths of the first filter and the second filter are separated by a preset bandwidth.
Because the first filter and the second filter belong to filters in communication channels, the center wavelengths of the first filter and the second filter should select in-band channels, the number of the communication channels is 48, the first filter 31, the second filter 32, the third filter 33 and the fourth filter 34 select narrow-band filters, the bandwidth required by the narrow-band filters is less than 15GHz, and the narrow-band filters are selected to completely filter signals of other channels or non-channels and only allow the signals of the channel to pass. The center wavelength of the first filter is selected as the channel wavelength at the edge of the communication channel number 48, the center wavelength of the second filter is separated from the first filter by 100GHz, and the communication channel number is selected to be 48, and the DWDM system with the separation of 100GHz is adopted. In a 50GHz DWDM system, the center wavelength of the second filter is spaced 50GHz from the first filter.
In this embodiment, in order to detect whether an optical signal outside a communication channel exists in output light of an EDFA, in combination with the embodiment of the present invention, there is also a preferred implementation, specifically, as shown in fig. 2, the out-of-band filter includes a third filter and a fourth filter, where:
the center wavelength of the third filter is set to be the middle value of the working wavelengths of the first filter and the second filter, the center wavelength of the fourth filter is set to be outside the EDFA communication waveband, and the distance between the center wavelengths of the third filter and the fourth filter is a preset bandwidth.
The central wavelength of the third filter is the middle value of the working wavelength bands of the first filter and the second filter, and in a DWDM system with the interval of 100GHz, the third filter is respectively 50GHz apart from the central wavelengths of the first filter and the second filter, or in a DWDM system with the interval of 50GHz, the third filter is respectively 25GHz apart from the central wavelengths of the first filter and the second filter. As the number of communication channels is 48, the filter belongs to a DWDM system with the interval of 100GHz, and the third filter is respectively separated from the central wavelengths of the first filter and the second filter by 50 GHz. The fourth filter is spaced 100GHz from the center wavelength of the first filter in a DWDM system spaced at 100GHz, or 50GHz from the center wavelength of the first filter in a DWDM system spaced at 50 GHz. As the number of the communication channels is 48, the DWDM system with the interval of 100GHz is adopted, and the center wavelength interval between the fourth filter and the first filter is 100 GHz. The isolation degree of the narrow-band filter from other channels is more than or equal to 30dB in general, and the isolation degree of the fourth filter is more than 30dB away from the first filter as far as possible.
In this embodiment, in order to respectively detect whether optical power in a communication channel in output light is normal and whether an optical signal exists in a non-communication channel, in combination with the embodiment of the present invention, there is also a preferred implementation, specifically, as shown in fig. 2, the determining, according to the output end single-wave optical power and the optical powers of the in-band filter and the out-of-band filter output optical paths, whether an output optical signal of the EDFA is normal includes:
the detection optical path passes through the first filter, the second filter, the third filter and the second filterAfter four filters, the optical power output by the first filter is recorded as Pλ1The optical power output by the second filter is denoted as Pλ2And the optical power output by the third filter is recorded as Pλ3The optical power output by the fourth filter is denoted as Pλ4；
Setting a first preset threshold and a second preset threshold, and judging the output end single-wave optical power and the Pλ1And said Pλ2Whether the difference value of (A) is less than or equal to a first preset threshold value simultaneously, and the output end single-wave optical power and the Pλ3And said Pλ4Whether the difference value is greater than or equal to a second preset threshold value or not, if so, the output optical signal of the EDFA is normal.
The output optical signal of the EDFA is normal, and only the filter in the communication channel can detect the optical power, i.e. the output light λ of the first filter in the channel1And the output light lambda of the second filter2Can be detected, not the output light lambda of the third filter in the channel3And the output light lambda of the fourth filter4Undetectable or detected optical power is small. The abnormal output optical signal of the EDFA is a broadband spectrum, and may be in the wavelength range of the communication channel or out of the wavelength range of the non-communication channel, and the wavelength of the non-communication channel is output light lambda passing through the third filter3And the output light lambda of the fourth filter4And then, if the optical power of the non-communication channel exists and reaches a certain threshold value, the EDFA is proved to have abnormal output optical signals.
In this embodiment, in order to determine whether the quality of the output light is qualified, in combination with the embodiment of the present invention, there is also a preferable implementation scheme, specifically, the first preset threshold is a maximum optical power difference between communication channels in a DWDM system where the EDFA output light is located, and the second preset threshold is an extinction ratio of the EDFA output light.
Because the maximum optical power difference between each communication channel in the DWDM system where the EDFA output light is located is generally less than or equal to 2dB, the first preset threshold selects the maximum optical power difference between each communication channel outputting the EDFA output lightThe power difference is that the extinction ratio of the output light of the EDFA is generally more than or equal to 30dB, and the extinction ratio of the output light of the EDFA is selected as the second preset threshold. Delta Pλ1，ΔPλ2Should be less than or equal to 2dB, delta Pλ3，ΔPλ4Should be greater than or equal to 30 dB. If the calculated values can not meet the requirements at the same time, the output light quality of the EDFA is abnormal, and the risk of circuit break or pump laser failure exists.
Example two
A second embodiment provides a method for detecting quality of an EDFA optical signal, as shown in fig. 1, the method includes the following steps:
and S101, an output light path of the EDFA splits light, and leads the optical signal split by the main light path into an in-band filter in a communication channel and an out-of-band filter in a non-communication channel to respectively detect optical power.
As shown in fig. 3, the output end of the EDFA is divided into two paths by the first optical splitter 21, the large-end optical power of the first optical splitter 21 is used as service light and output to the next EDFA, and the small-end optical power is split by the second optical splitter 22 for the second time. In practical applications, the splitting ratio of the first splitter 21 can be selected according to requirements, and in this embodiment, is selected to be between 1% and 10%. The light split from the small end of the first optical splitter 21 is split for the second time by the second optical splitter 22, the small end optical power of the second optical splitter 22 is used for amplifying service light output detection to control the gain of the EDFA, the total optical power of the EDFA output optical path can be derived from the small end optical power of the second optical splitter 22, the optical power of the EDFA output optical path is recorded as Pout, and the large end optical power of the second optical splitter 22 is split for the third time by the third optical splitter 23. In practical applications, the splitting ratio of the second splitter 22 can be selected according to requirements, and in this embodiment, is selected to be between 10% and 50%. After the large-end optical power of the second optical splitter 22 is split by the third optical splitter 23, the large-end optical power of the third optical splitter 23 is split by the fourth optical splitter 24 for three times and then divided into three detection optical paths, the detection optical paths are used for respectively detecting the optical power in and out of the channel, the three detection optical paths respectively pass through a narrow band filter and perform power detection, one of the detection optical paths is used for detecting the optical power out of the channel, and the other two detection optical paths are used for detecting the optical power in the channel. The small-end optical power of the third optical splitter 23 is connected to a fourth filter, and the center wavelength of the fourth filter is set outside the EDFA communication band, so as to detect the optical power outside the channel. The splitting ratio of the third splitter 23 can be selected according to the requirement, and in this embodiment, is selected to be between 10% and 50%.
And S102, obtaining single-wave light power at an output end according to the total light power of the output light path of the EDFA and the number of channels where the EDFA is located.
The total optical power of the output optical path of the EDFA is derived from the small-end optical power of the second optical splitter 22, the total optical power of the output optical path of the EDFA is denoted as Pout, the single-wave optical power of the output end is denoted as Pout _ single, and the Pout _ single is calculated in a manner that Pout _ single is Pout-10 × logN, where N is the number of communication channels, and in this embodiment, the number of communication channels is 48.
And S103, judging whether the output optical signal of the EDFA is normal or not according to the output end single-wave optical power and the optical power of the output optical paths of the in-band filter and the out-of-band filter.
Recording the single-wave optical power of the output end as Pout _ single, and respectively connecting the single-wave optical power with the output light lambda in the channel1Optical power Pλ1In-channel output light lambda2Optical power Pλ2Output light lambda outside the channel3Optical power Pλ3Output light lambda outside the channel4Optical power Pλ4The single-wave light power of the output end is respectively differenced with the light power of the four output lights, the power difference is calculated, and the absolute value delta P is takenλi，ΔPλi＝|Pout_single-PλiWhere i ═ 1,2,3,4, Δ Pλ1，ΔPλ2Respectively representing the power of the single wave light and the in-band output light lambda1，λ2Absolute value of difference in optical power, Δ Pλ3，ΔPλ4Respectively representing single wave optical power and out-of-band output light lambda3，λ4Absolute value of the optical power difference.
Setting a first preset threshold and a second preset threshold, and judging the output end single-wave optical power and Pλ1And Pλ2Whether the difference value is less than or equal to a first preset threshold value simultaneously, and the output end single-wave optical power and the Pλ3And Pλ4Whether the difference is greater than or equal to a second preset threshold value or not, if soAnd if the output optical signals meet the requirements, the output optical signals of the EDFA are normal. The flatness of the output light of the EDFA is generally less than or equal to 2dB, the maximum optical power difference between communication channels in a DWDM system where the output light of the EDFA is located is selected as a first preset threshold, the extinction ratio of the output light of the EDFA is greater than or equal to 30dB is selected as a second preset threshold.
ΔPλ1，ΔPλ2Should be less than or equal to 2dB, delta Pλ3，ΔPλ4Should be greater than or equal to 30 dB. If the calculated values can not meet the requirements at the same time, the output light quality of the EDFA is abnormal, and the risk of open circuit or PUMP failure exists.
EXAMPLE III
In a third embodiment, a device for detecting quality of an EDFA optical signal is provided, as shown in fig. 2, the device includes an EDFA component 1, a splitter component 2, a filter component 3, a photodetection component 4, and a control unit 5, where:
the optical splitter component 2 is arranged between the EDFA components 1, optical signals are transmitted between the EDFA components 1 on a main optical path, and the filter component 3 and the photoelectric detection component 4 are arranged on a secondary optical path;
the photoelectric detection component 4 detects the optical power of the EDFA output optical path and the optical power output by the filter component 3;
the control unit 5 determines whether the output optical signal of the EDFA component 1 is normal by calculating a difference between the optical power of the EDFA output optical path and the output optical power of the filter component 3.
As shown in fig. 2, optical signals are transmitted between EDFA components 1 on a main optical path, and a filter component 3 and a photodetection component 4 are disposed on a secondary optical path, which may specifically be: the light split from the small end of the first optical splitter 21 is split for the second time by the second optical splitter 22, the small end optical power of the second optical splitter 22 is used for amplifying the service light output detection to control the gain of the EDFA, the total optical power of the EDFA output optical path can be derived from the small end optical power of the second optical splitter 22, and the optical power of the EDFA output optical path is recorded as Pout. The output single-wave optical power is recorded as Pout _ single, and Pout _ single is calculated in a manner that Pout _ single is Pout-10 log N, where N is the number of communication channels, and in this embodiment, the number of communication channels is 48. After the secondary light path is subjected to light splitting, the detection light path is used for respectively detecting the light power in the channel and the light power outside the channel.
As shown in fig. 2, the output single-wave optical power is denoted as Pout _ single, and is respectively associated with the in-channel output light λ1Optical power Pλ1In-channel output light lambda2Optical power Pλ2Output light lambda outside the channel3Optical power Pλ3Output light lambda outside the channel4Optical power Pλ4Making difference, calculating power difference and taking absolute value delta Pλi，ΔPλi＝|Pout_single-PλiWhere i ═ 1,2,3,4, Δ Pλ1，ΔPλ2Respectively representing the power of the single wave light and the in-band output light lambda1，λ2Absolute value of difference in optical power, Δ Pλ3，ΔPλ4Respectively representing single wave optical power and out-of-band output light lambda3，λ4Absolute value of the optical power difference.
Setting a first preset threshold and a second preset threshold, judging whether the difference values of the output end single-wave optical power, the P lambda 1 and the P lambda 2 are simultaneously smaller than or equal to the first preset threshold, and whether the difference values of the output end single-wave optical power, the P lambda 3 and the P lambda 4 are simultaneously larger than or equal to the second preset threshold, if so, judging that the output optical signals of the EDFA are normal. Because the maximum optical power difference between each communication channel in the DWDM system where the EDFA output light is located is generally less than or equal to 2dB, the maximum power difference between each communication channel where the EDFA output light is selected as the first preset threshold, the extinction ratio of the EDFA output light is selected as the second preset threshold, and the extinction ratio in this embodiment is 30 dB.
ΔPλ1，ΔPλ2Should be less than or equal to 2dB, delta Pλ3，ΔPλ4Should be greater than or equal to 30 dB. If the calculated values can not meet the requirements at the same time, the output light quality of the EDFA is abnormal, and the risk of circuit break or pump laser failure exists.
In this third embodiment, in combination with the embodiment of the present invention, there is also a preferred implementation, specifically, as shown in fig. 2, the optical splitter assembly 2 includes a first optical splitter 21, a second optical splitter 22, and a third optical splitter 23, where:
the first optical splitter 21 is arranged between the EDFA assemblies 1, and the optical path is split into a main optical path and a secondary optical path by the first optical splitter 21;
the second optical splitter 22 is disposed on the secondary optical path, the secondary optical path is divided into a first optical path and a second optical path by the second optical splitter 22, the first photodetector 41 in the photodetection component 4 is disposed on the second optical path, and the optical power detected by the first photodetector 41 obtains the optical power of the EDFA output optical path;
the third optical splitter 23 is disposed on the first optical path, the third optical splitter 23 equally divides the first optical path into a plurality of detection optical paths, the detection optical paths are guided into the filter component 3 and respectively connected with the detector of the photoelectric detection component 4 to detect the optical power of each optical path, and the optical power of each detection optical path is PλiWherein i represents the number of each detection light path.
In this third embodiment, in combination with the embodiment of the present invention, there is also a preferred implementation, specifically, as shown in fig. 2, the filter component 3 includes a first filter 31, a second filter 32, a third filter 33, and a fourth filter 34, where:
the first filter 31 and the second filter 32 are located within a communication channel and the center wavelengths of the first filter and the second filter are separated by a preset bandwidth;
the third filter 33 and the fourth filter 34 are located in a non-communication channel, the center wavelength of the third filter is set to be the middle value of the operating wavelengths of the first filter and the second filter, the center wavelength of the fourth filter is set to be outside the EDFA communication band, and the center wavelengths of the third filter and the fourth filter are separated by a preset bandwidth;
the center wavelengths of the first filter 31, the second filter 32 and the third filter 33 are all within the communication band of the EDFA.
Because the first filter and the second filter belong to filters in communication channels, the center wavelengths of the first filter and the second filter should select in-band channels, the number of the communication channels is 48, the first filter 31, the second filter 32, the third filter 33 and the fourth filter 34 select narrow-band filters, the bandwidth required by the narrow-band filters is less than 15GHz, and the narrow-band filters are selected to completely filter signals of other channels or non-channels and only allow the signals of the channel to pass. The center wavelength of the first filter is selected as the channel wavelength at the edge of the communication channel number 48, the center wavelength of the second filter is separated from the first filter by 100GHz, and the communication channel number is selected to be 48, and the DWDM system with the separation of 100GHz is adopted. In a 50GHz DWDM system, the center wavelength of the second filter is spaced 50GHz from the first filter.
The central wavelength of the third filter is the middle value of the working wavelength bands of the first filter and the second filter, and in a DWDM system with the interval of 100GHz, the third filter is respectively 50GHz apart from the central wavelengths of the first filter and the second filter, or in a DWDM system with the interval of 50GHz, the third filter is respectively 25GHz apart from the central wavelengths of the first filter and the second filter. As the number of communication channels is 48, the filter belongs to a DWDM system with the interval of 100GHz, and the third filter is respectively separated from the central wavelengths of the first filter and the second filter by 50 GHz. The fourth filter is spaced 100GHz from the center wavelength of the first filter in a DWDM system spaced at 100GHz, or 50GHz from the center wavelength of the first filter in a DWDM system spaced at 50 GHz. As the number of the communication channels is 48, the DWDM system with the interval of 100GHz is adopted, and the center wavelength interval between the fourth filter and the first filter is 100 GHz. The isolation degree of the narrow-band filter from other channels is more than or equal to 30dB in general, and the isolation degree of the fourth filter is more than 30dB away from the first filter as far as possible.
The output optical signal of the EDFA is normal, and only the filter in the communication channel can detect the optical power, i.e. the output light λ of the first filter in the channel1And the output light lambda of the second filter2Can be detected, not the third in-channelOutput light lambda of the filter3And the output light lambda of the fourth filter4No detection is possible or the detected optical power is small. The abnormal output optical signal of the EDFA is a broadband spectrum, and may be in the wavelength range of the communication channel or out of the wavelength range of the non-communication channel, and the wavelength of the non-communication channel is output light lambda passing through the third filter3And after the output light lambda 4 of the fourth filter, if the optical power of the non-communication channel exists and reaches a certain threshold value, the fact that the EDFA outputs the optical signal abnormally is proved.
In order to facilitate real-time detection of the optical power of the optical path, in combination with the embodiment of the present invention, there is also a preferred implementation scheme, specifically, as shown in fig. 2, the photodetection assembly 4 includes a first detector 41, a second detector 42, a third detector 43, a fourth detector 44, and a fifth detector 45, where:
the first detector 41 detects the optical power on the second optical path, and the optical power detected by the first photodetector 41 obtains the optical power of the EDFA output optical path;
the second detector 42, the third detector 43, the fourth detector 44 and the fifth detector 45 are respectively connected to the detection optical paths passing through the first filter 31, the second filter 32, the third filter 33 and the fourth filter 34.
In the third embodiment of the apparatus for detecting the quality of an EDFA optical signal, the power of the in-band and out-of-band optical signals at the output end of the EDFA can be detected in real time, and it can be determined whether the optical power output of the EDFA in the communication channel band is normal or not by detecting the in-band or out-of-band optical power, so that the quality of each EDFA signal can be determined quickly, and a fault position can be located quickly and effectively in an EDFA cascade link.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A method for detecting EDFA optical signal quality, the method comprising:
an output light path of the EDFA splits light, and leads optical signals split by a main light path into an in-band filter in a communication channel and an out-of-band filter in a non-communication channel to respectively detect optical power;
obtaining output end single-wave light power according to the total light power of the EDFA output light path and the number of channels where the EDFA is located;
and judging whether the output optical signal of the EDFA is normal or not according to the output end single-wave optical power and the optical power of the output optical paths of the in-band filter and the out-of-band filter.
2. The method of detecting quality of an optical signal of an EDFA according to claim 1, wherein the optical power of the optical signal dropped from the main optical path is detected by splitting the optical signal into an in-band filter in a communication channel and an out-of-band filter in a non-communication channel, respectively, the method comprising:
an output light path of the EDFA is divided into a main light path and a secondary light path through primary light splitting, and the main light path transmits an optical signal to the EDFA at the next stage;
the secondary optical path is divided into a first optical path and a second optical path through secondary light splitting, the optical power of the first optical path is greater than that of the second optical path, and the total optical power of the EDFA output optical path is obtained according to the optical power of the second optical path;
the first optical path equally divides the optical path into a plurality of detection optical paths through three-time light splitting, and the equally divided detection optical paths are respectively led into the in-band filter and the out-of-band filter to detect the optical power.
3. The method of detecting quality of an EDFA optical signal of claim 2, wherein the in-band filter comprises a first filter and a second filter, wherein:
the center wavelengths of the first filter and the second filter are arranged in a communication channel of the EDFA, and the center wavelengths of the first filter and the second filter are separated by a preset bandwidth.
4. The method of detecting quality of an EDFA optical signal of claim 3, wherein the out-of-band filter comprises a third filter and a fourth filter, wherein:
the center wavelength of the third filter is set to be the middle value of the working wavelengths of the first filter and the second filter, the center wavelength of the fourth filter is set to be outside the EDFA communication waveband, and the distance between the center wavelengths of the third filter and the fourth filter is a preset bandwidth.
5. The method of detecting quality of an optical signal of an EDFA according to any of claims 1 to 4, wherein said determining whether an output optical signal of the EDFA is normal according to the optical power of the output single-wave and the optical powers of the in-band filter and the out-of-band filter output optical paths comprises:
after the detection light path passes through the first filter, the second filter, the third filter and the fourth filter, the optical power output by the first filter is recorded as Pλ1The optical power output by the second filter is denoted as Pλ2And the optical power output by the third filter is recorded as Pλ3The optical power output by the fourth filter is denoted as Pλ4；
Setting a first preset threshold and a second preset threshold, and judging the output end single-wave optical power and the Pλ1And said Pλ2Whether the difference value of (A) is less than or equal to a first preset threshold value simultaneously, and the output end single-wave optical power and the Pλ3And said Pλ4Whether the difference value is greater than or equal to a second preset threshold value or not, if so, the output optical signal of the EDFA is normal.
6. The method of detecting quality of an EDFA optical signal according to claim 1, wherein the first preset threshold is a maximum optical power difference between communication channels in a DWDM system in which the EDFA output light is located, and the second preset threshold is an extinction ratio of the EDFA output light.
7. An arrangement for detecting the quality of an EDFA optical signal, characterized in that the arrangement comprises an EDFA component (1), a splitter component (2), a filter component (3), a photodetection component (4) and a control unit (5), wherein:
the optical splitter component (2) is arranged between the EDFA components (1), optical signals are transmitted between the EDFA components (1) on a main optical path, and the filter component (3) and the photoelectric detection component (4) are arranged on a secondary optical path;
the photoelectric detection component (4) detects the optical power of the EDFA output optical path and the optical power output by the filter component (3);
and the control unit (5) judges whether the output optical signal of the EDFA component (1) is normal or not by calculating the difference value between the optical power of the output optical path of the EDFA and the output optical power of the filter component (3).
8. The apparatus for detecting quality of an EDFA optical signal according to claim 7, wherein the splitter module (2) comprises a first splitter (21), a second splitter (22) and a third splitter (23), wherein:
the first optical splitter (21) is arranged between the EDFA assemblies (1), and the first optical splitter (21) divides an optical path into a main optical path and a secondary optical path;
the second optical splitter (22) is arranged on the secondary optical path, the secondary optical path is divided into a first optical path and a second optical path by the second optical splitter (22), a first photoelectric detector (41) in the photoelectric detection component (4) is arranged on the second optical path, and the total optical power of the EDFA output optical path is obtained from the optical power detected by the first photoelectric detector (41);
the third optical splitter (23) is arranged on the first light path, the first light path is equally divided into a plurality of detection light paths by the third optical splitter (23), and the detection light paths are led into the filter component (3) and are respectively connected with the photoelectric detection component (4)The detectors are connected to detect the optical power of each optical path, and the optical power of each detection optical path is PλiWherein i represents the number of each detection light path.
9. The apparatus for detecting the quality of an EDFA optical signal according to claim 8, wherein the filter assembly (3) comprises a first filter (31), a second filter (32), a third filter (33) and a fourth filter (34), wherein:
the first filter (31) and the second filter (32) are located within a communication channel, and the center wavelengths of the first filter and the second filter are separated by a preset bandwidth;
-said third filter (33) and said fourth filter (34) are located in non-communication channels, the third filter having a centre wavelength set to the median of the operating wavelengths of said first and second filters, the fourth filter having a centre wavelength set outside the EDFA communication band, and the centre wavelengths of said third and fourth filters being separated by a predetermined bandwidth;
the first filter (31), the second filter (32) and the third filter (33) each have a center wavelength within a communication band of the EDFA.
10. The apparatus for detecting quality of an EDFA optical signal of claim 8, characterized in that the photo detection assembly (4) comprises a first detector (41), a second detector (42), a third detector (43), a fourth detector (44) and a fifth detector (45), wherein:
the first detector (41) detects the optical power on the second optical path, and the optical power detected by the first photodetector (41) obtains the optical power of the EDFA output optical path;
the second detector (42), the third detector (43), the fourth detector (44) and the fifth detector (45) are respectively connected with the detection optical paths passing through the first filter (31), the second filter (32), the third filter (33) and the fourth filter (34).
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