CN115441946B - Method and device for measuring EDFA gain curve based on optical fiber ring - Google Patents
Method and device for measuring EDFA gain curve based on optical fiber ring Download PDFInfo
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- CN115441946B CN115441946B CN202211049771.0A CN202211049771A CN115441946B CN 115441946 B CN115441946 B CN 115441946B CN 202211049771 A CN202211049771 A CN 202211049771A CN 115441946 B CN115441946 B CN 115441946B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims abstract description 80
- 238000001228 spectrum Methods 0.000 claims abstract description 29
- 238000012360 testing method Methods 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 9
- 230000002238 attenuated effect Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000004891 communication Methods 0.000 abstract description 4
- 238000000691 measurement method Methods 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000010801 machine learning Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
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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
- H04B10/079—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
- H04B10/0797—Monitoring line amplifier or line repeater equipment
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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
- H04B10/079—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
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
The application discloses a method and a device for measuring an EDFA gain curve based on an optical fiber ring, which relate to the technical field of optical communication, and the method for measuring the EDFA gain curve based on the optical fiber ring comprises the following steps: the signal source generates multi-wavelength broad spectrum signal light, one part of the signal light enters the spectrometer, and the other part of the signal light enters the optical fiber loop through the first acousto-optic modulator and enters the spectrometer after being transmitted for a preset number of turns and distance in the optical fiber loop; the optical fiber loop comprises an EDFA to be tested and a second wavelength selective switch WSS; comparing the spectrum difference of the optical fiber before and after entering the optical fiber loop, and adjusting the configuration of the second WSS to realize gain flattening; and according to the configuration of the second WSS, reversely pushing to obtain the gain curve of the EDFA to be tested. The method and the device not only realize the high-precision measurement of the EDFA gain curve, but also have simple measurement method and great value for the deployment optimization of the EDFA in the line.
Description
Technical Field
The application relates to the technical field of optical communication, in particular to a method and a device for measuring an EDFA gain curve based on an optical fiber ring.
Background
Currently, the use of Software Defined Networks (SDNs) in Wavelength Division Multiplexing (WDM) systems may increase the level of control and flexibility of optical networks. High level automated software control requires accurate information about the relevant device and system characteristics, with optical amplifier parameters being particularly important.
The gain of the optical amplifier determines the channel power into the transmission fiber, which determines the optical signal-to-noise ratio and fiber nonlinear effects, and also affects the optical power offset as the wavelength is dynamically routed. Therefore, the accurate channel model and the single channel power information on each amplifier in the link are obtained, and the performance of functions such as wavelength routing, modulation format adaptive control and the like can be improved. The optical communication network generally realizes accurate channel power control through the wavelength selective switch at the upper and lower multiplexer nodes, and if the output power of each amplifier can be accurately known, the optical power margin of the link can be widened, the system cost is reduced, and the speed and stability of wavelength switching are improved.
In the related art, a static model and a machine learning method are generally used to estimate the gain curve of the erbium doped fiber amplifier EDFA. The static model can predict the output power of a single channel under different channel configurations based on theoretical analysis, but the accuracy is poor; the machine learning method models based on a large amount of data, and has high precision, but the method requires a large amount of test data and has high requirement on the measurement data. There remains a need for a more simplified method for testing the gain curves of individual EDFAs.
Disclosure of Invention
Aiming at the defects in the prior art, the application aims to provide a method and a device for measuring an EDFA gain curve based on an optical fiber ring, so as to solve the problem that the gain curve of a single EDFA is complex in the related art.
The first aspect of the present application provides a method for measuring an EDFA gain curve based on an optical fiber loop, comprising the steps of:
The signal source generates multi-wavelength broad spectrum signal light, one part of the signal light enters the spectrometer, and the other part of the signal light enters the optical fiber loop through the first acousto-optic modulator and enters the spectrometer after being transmitted for a preset number of turns and distance in the optical fiber loop; the optical fiber loop comprises an EDFA to be tested and a second wavelength selective switch WSS;
comparing the spectrum difference of the optical fiber before and after entering the optical fiber loop, and adjusting the configuration of the second WSS to realize gain flattening;
And according to the configuration of the second WSS, reversely pushing to obtain the gain curve of the EDFA to be tested.
In some embodiments, the optical fiber loop further includes a second optical modulator and a first optical splitter connected in series;
The first acousto-optic modulator controls the wide-spectrum signal light to enter an optical fiber loop through a first optical divider;
The second optical modulator controls the broad spectrum signal light to propagate in the optical fiber loop for a preset circle number and distance, and then enters the spectrometer through the first optical divider.
In some embodiments, the signal source includes an ASE noise source and a first WSS; the signal source for generating a broad spectrum signal light specifically includes:
The ASE noise source transmits a wide-spectrum signal to a first WSS;
the first WSS filters the broad spectrum signal to construct the broad spectrum signal light.
In some embodiments, the signal source further includes a non-EDFA under test;
after the first WSS constructs the broad spectrum signal light, the broad spectrum signal light is amplified by the EDFA which is not to be detected.
In some embodiments, a second optical splitter is further connected between the EDFA to be tested and the first acousto-optic modulator;
the amplified broad spectrum signal light is divided into two paths by the second optical divider, one path enters the spectrometer, and the other path enters the first acousto-optic modulator.
In some embodiments, an adjustable optical attenuator is further connected in series between the EDFA to be tested and the second WSS;
And the output light of the EDFA to be detected enters a second WSS after being attenuated by the adjustable optical attenuator.
A second aspect of the present application provides an apparatus for measuring an EDFA gain curve based on an optical fiber loop for implementing the above method, comprising:
The signal source is used for generating multi-wavelength broad spectrum signal light, one part of the signal light enters the spectrometer, and the other part of the signal light enters the optical fiber loop through the first acousto-optic modulator;
The optical fiber loop comprises a second optical modulator, a first optical splitter, an EDFA to be tested and a second wavelength selective switch WSS which are sequentially connected in series; two input ends of the first optical splitter are respectively connected with the first acoustic optical modulator and the second acoustic optical modulator, and two output ends of the first optical splitter are respectively connected with the second acoustic optical modulator and the spectrograph;
The first acousto-optic modulator is used for controlling the wide-spectrum signal light to be input into the optical fiber loop through the first optical divider; the second acoustic optical modulator is used for controlling the broad spectrum signal light to propagate in an optical fiber loop for a preset number of turns and distance;
the spectrometer is used to test the spectra before and after entering the fiber loop.
In some embodiments, the signal source includes:
an ASE noise source, said ASE noise source being configured to emit a broad spectrum signal;
the first WSS is used for filtering the broad spectrum signal to construct multi-wavelength broad spectrum signal light;
And the non-to-be-detected EDFA is used for amplifying the wide-spectrum signal light.
In some embodiments, the apparatus further includes a second optical splitter, where an input end of the second optical splitter is connected to the EDFA to be tested, and an output end of the second optical splitter is connected to the first acousto-optic modulator and the spectrometer, respectively.
In some embodiments, an adjustable optical attenuator is further connected in series between the EDFA to be tested and the second WSS.
The technical scheme provided by the application has the beneficial effects that:
According to the method and the device for measuring the EDFA gain curve based on the optical fiber ring, as one part of wide-spectrum signal light generated by the signal source enters the optical fiber ring through the first acousto-optic modulator, and the other part enters the optical fiber ring after the preset number of turns and distance are transmitted in the optical fiber ring, the wide-spectrum signal light enters the optical fiber ring, and further, when the spectrum difference of the optical fiber ring tested by the optical fiber ring is compared, the configuration of the second WSS is adjusted to realize gain flattening, the gain curve of the EDFA to be measured can be obtained by back-pushing according to the configuration of the second WSS, namely, the gain imbalance of the EDFA to be measured is eliminated by using the second WSS in the optical fiber ring, and then the gain model of the EDFA to be measured can be fitted through the gain setting of the second WSS; therefore, the high-precision measurement of the EDFA gain curve is realized, the measurement method is simple, and the method has great value for the deployment optimization of the EDFA in the line.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for measuring EDFA gain curves based on an optical fiber ring in the present embodiment;
fig. 2 is a schematic diagram of an apparatus for measuring an EDFA gain curve based on an optical fiber loop in the present embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. In addition, the technical features of the embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
The embodiment of the application provides a method and a device for measuring an EDFA gain curve based on an optical fiber ring, which can solve the problem that the gain curve of a single EDFA is complex in the related technology.
As shown in fig. 1, the method for measuring the gain curve of the EDFA based on the optical fiber loop according to the embodiment of the present application specifically includes the following steps:
S1, a signal source generates multi-wavelength broad spectrum signal light, one part of the signal light enters a spectrometer, the other part of the signal light enters an optical fiber loop through a first acousto-optic modulator, and the signal light enters the spectrometer after being transmitted for a preset number of turns and a preset distance in the optical fiber loop.
The optical fiber loop comprises an EDFA to be tested and a second wavelength selective switch WSS.
S2, comparing the spectrum difference of the optical fiber loop tested by the spectrometer, and adjusting the configuration of the second WSS to realize gain flattening.
The second WSS in the optical fiber loop can be accurately adjusted according to observation of the spectrometer, so that the spectrum of the output optical fiber loop is smooth.
S3, according to the configuration of the second WSS, a gain curve of the EDFA to be detected is obtained through back-pushing. That is, the second WSS in the optical fiber loop completely compensates the gain imbalance of the EDFA to be measured at different wavelengths, so that the gain curve of the EDFA to be measured can be reversely deduced through the configuration of the second WSS.
According to the method, as one part of wide-spectrum signal light generated by a signal source enters a spectrometer, the other part of the wide-spectrum signal light enters an optical fiber loop through a first acousto-optic modulator, and enters the spectrometer after a preset number of turns and a preset distance are transmitted in the optical fiber loop, when the spectrum difference of the signal source before and after entering the optical fiber loop, which is tested by the spectrometer, is compared, the configuration of a second WSS is adjusted to realize gain flattening, a gain curve of the EDFA to be tested can be obtained by back-pushing based on the configuration of the second WSS, namely the gain imbalance of the EDFA to be tested is eliminated by using the second WSS in the optical fiber loop, and then a gain model of the EDFA to be tested can be fitted through the gain setting of the second WSS; therefore, the high-precision measurement of the EDFA gain curve is realized, the measurement method is simple, and the method has great value for the deployment optimization of the EDFA in the line.
Based on the above embodiment, in this embodiment, the optical fiber loop further includes a second optical modulator and a first optical splitter. That is, the fiber loop includes a second optical modulator, a first optical splitter, an EDFA under test, and a second WSS in series in that order.
The first acousto-optic modulator controls the wide-spectrum signal light to enter an optical fiber loop through a first optical divider; the second optical modulator controls the broad spectrum signal light to propagate in the optical fiber loop for a preset circle number and distance, and then enters the spectrometer through the first optical divider.
Preferably, the first acousto-optic modulator also prevents other optical signals from being input into the fiber loop when the broad spectrum signal light is transmitted cyclically in the fiber loop.
In this embodiment, the two acousto-optic modulators control the first optical splitter to control the set number of turns and distance of the broad spectrum signal light transmitted in the optical fiber loop, and the loop passes through the EDFA to be tested, so that the gain imbalance of the EDFA to be tested on different wavelengths can be amplified and accumulated, thereby facilitating accurate adjustment.
Further, the signal source includes an ASE (AMPLIFIER SPONTANEOUS EMISSION NOISE ) noise source and a first WSS; the signal source in the step S1 generates a broad spectrum signal light specifically including the following steps:
First, the ASE noise source described above emits a broad spectrum signal to the first WSS.
Then, the first WSS filters the broad spectrum signal to construct a broad spectrum signal light of multiple wavelengths.
Preferably, the signal source further comprises a non-EDFA under test. After the first WSS constructs the multi-wavelength broad spectrum signal light, the broad spectrum signal light is amplified by the non-to-be-detected EDFA.
Specifically, when the signal source is adjusted to generate wide-spectrum signal light, the wide-spectrum signal generated by the ASE noise source is shaped by the first WSS, and the same optical power is output on all wavelengths. The first WSS simultaneously filters out a portion of the wavelengths for amplification, simulating the transmission of signal light at the portion of the wavelengths. And then amplified by a non-EDFA under test to enter the fiber loop and spectrometer, respectively.
Based on the above embodiment, in this embodiment, a second optical splitter is further connected between the EDFA not to be tested and the first acousto-optic modulator.
The wide-spectrum signal light amplified by the EDFA which is not to be detected is divided into two paths by the second optical divider, one path enters the spectrometer, and the other path enters the first acousto-optic modulator.
Based on the above embodiment, in this embodiment, an adjustable optical attenuator is further connected in series between the EDFA to be tested and the second WSS; and the output light of the EDFA to be detected enters a second WSS after being attenuated by the adjustable optical attenuator.
According to the method, the first WSS is used for setting the on-off of the optical paths at different wavelengths, so that signal transmission of different optical channels can be simulated; by precisely adjusting the optical power attenuation values of the second WSS at different wavelengths, the output spectrum can be flattened. When the optical signal passes through the optical fiber loop, the gain is still flat, the setting of the WSS in the optical fiber loop is read, and the gain fluctuation of the EDFA2 can be estimated from the optical attenuation values at different wavelengths, so that the gain curve of the EDFA2 is obtained.
As shown in fig. 2, the apparatus for measuring the gain curve of the EDFA for implementing the method of the present embodiment includes a signal source, an optical fiber loop, and a spectrometer.
The signal source is used for generating a multi-wavelength broad spectrum signal light, one part of the generated broad spectrum signal light enters the spectrometer, and the other part of the generated broad spectrum signal light enters the optical fiber loop through the first acousto-optic modulator.
The optical fiber loop comprises a second optical modulator, a first optical splitter, an EDFA to be tested and a second wavelength selective switch WSS which are sequentially connected in series; two input ends of the first optical splitter are respectively connected with the first acousto-optic modulator and the second acousto-optic modulator, and two output ends of the first optical splitter are respectively connected with the second acousto-optic modulator and the spectrograph.
The first acousto-optic modulator is used for controlling the wide-spectrum signal light to be input into the optical fiber loop through the first optical divider; the second optical modulator is used for controlling the broad spectrum signal light to propagate in the optical fiber loop for a preset circle number and distance, and then the broad spectrum signal light can enter the spectrometer through the first optical divider.
The spectrometer is used for testing the spectra before and after entering the optical fiber loop so as to observe whether the optical power at different wavelengths is flat or not.
When the configuration of the second WSS is adjusted to realize gain flattening based on the spectrum difference before and after entering the optical fiber loop, the gain curve of the EDFA to be tested can be reversely obtained according to the configuration of the second WSS.
On the basis of the above embodiment, in this embodiment, the signal source includes an ASE noise source and a first wavelength selective switch WSS.
The ASE noise source described above is used to emit a broad spectrum signal. The first WSS is used for filtering the broad spectrum signal to construct multi-wavelength broad spectrum signal light.
Specifically, a broad-spectrum noise signal generated by an ASE noise source is shaped through a first WSS, and partial wavelengths are selected for amplification so as to simulate a channel to transmit signal light.
Further, the signal source further includes a non-to-be-measured EDFA, where the non-to-be-measured EDFA is configured to amplify the broad spectrum signal light.
Based on the above embodiment, in this embodiment, the apparatus further includes a second optical splitter, an input end of the second optical splitter is connected to the EDFA to be tested, and an output end of the second optical splitter is connected to the first acousto-optic modulator and the spectrometer, so as to split the amplified broad spectrum signal light into two paths.
Preferably, an adjustable optical attenuator is further connected in series between the EDFA to be measured and the second WSS, so as to attenuate the output light of the EDFA to be measured and then input the attenuated output light into the second WSS.
The device for measuring the gain curve of the EDFA of the embodiment is suitable for the methods, particularly suitable for testing the gain curve of a single EDFA in a laboratory environment, and can reversely push the gain imbalance of the EDFA in a measured wavelength range when the gain setting of the second WSS is found to enable the gain of the EDFA to be measured to be accurately flat by controlling the transmission of wide-spectrum signal light in an optical fiber ring so as to observe the accumulation of the gain imbalance of the EDFA to be measured. The method not only realizes high-precision measurement of the EDFA gain curve, but also has simple measurement method and great value for deployment optimization of the EDFA in the line.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A method for measuring an EDFA gain curve based on an optical fiber loop, comprising the steps of:
The signal source generates multi-wavelength broad spectrum signal light, one part of the signal light enters the spectrometer, and the other part of the signal light enters the optical fiber loop through the first acousto-optic modulator and enters the spectrometer after being transmitted for a preset number of turns and distance in the optical fiber loop; the optical fiber loop comprises an EDFA to be tested and a second wavelength selective switch WSS;
comparing the spectrum difference of the optical fiber before and after entering the optical fiber loop, and adjusting the configuration of the second WSS to realize gain flattening;
according to the configuration of the second WSS, a gain curve of the EDFA to be detected is obtained through back-pushing;
the optical fiber loop further comprises a second optical modulator and a first optical splitter which are connected in series;
the first acousto-optic modulator controls the wide-spectrum signal light to enter an optical fiber loop through a first optical divider;
the second optical modulator controls the broad spectrum signal light to propagate in the optical fiber loop for a preset number of turns and distance, and then enters the spectrometer through the first optical divider; the signal source comprises an ASE noise source and a first WSS; the signal source for generating a broad spectrum signal light specifically comprises:
The ASE noise source transmits a wide-spectrum signal to the first WSS;
the first WSS filters the broad spectrum signal to construct the broad spectrum signal light;
The signal source also comprises a non-to-be-measured EDFA;
after the first WSS constructs the broad spectrum signal light, the broad spectrum signal light is amplified through the EDFA which is not to be detected;
a second optical branching device is also connected between the non-to-be-detected EDFA and the first acousto-optic modulator;
the amplified broad spectrum signal light is divided into two paths by the second optical divider, one path enters the spectrometer, and the other path enters the first acousto-optic modulator;
an adjustable optical attenuator is also connected in series between the EDFA to be tested and the second WSS;
And the output light of the EDFA to be detected enters a second WSS after being attenuated by the adjustable optical attenuator.
2. An apparatus for measuring an EDFA gain curve based on an optical fiber loop for implementing the method of claim 1, comprising:
The signal source is used for generating multi-wavelength broad spectrum signal light, one part of the signal light enters the spectrometer, and the other part of the signal light enters the optical fiber loop through the first acousto-optic modulator;
The optical fiber loop comprises a second optical modulator, a first optical splitter, an EDFA to be tested and a second wavelength selective switch WSS which are sequentially connected in series; two input ends of the first optical divider are respectively connected with the first acoustic optical modulator and the second acoustic optical modulator, and two output ends of the first optical divider are respectively connected with the second acoustic optical modulator and the spectrograph;
The first acousto-optic modulator is used for controlling the wide-spectrum signal light to be input into the optical fiber loop through the first optical divider; the second acoustic optical modulator is used for controlling the broad spectrum signal light to propagate in the optical fiber loop for a preset number of turns and distance;
the spectrometer is used to test the spectra before and after entering the fiber loop.
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