CN113810106B - Safety monitoring method and device of optical fiber energy information common transmission system - Google Patents

Safety monitoring method and device of optical fiber energy information common transmission system Download PDF

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CN113810106B
CN113810106B CN202110986061.XA CN202110986061A CN113810106B CN 113810106 B CN113810106 B CN 113810106B CN 202110986061 A CN202110986061 A CN 202110986061A CN 113810106 B CN113810106 B CN 113810106B
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light
power
energy
raman
optical fiber
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CN113810106A (en
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秦玉文
刘丽娟
彭迪
杨海林
付松年
李建平
向梦
许鸥
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Guangdong University of Technology
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor

Abstract

The invention discloses a safety monitoring method and a safety monitoring device for an optical fiber energy information common transmission system, wherein on one hand, the condition of an optical fiber link is monitored by monitoring the reflected light power generated by Rayleigh scattering at a central station; on the other hand, by utilizing the nonlinear effect of high-power energy light in the optical fiber and monitoring the Brillouin scattered light power and Raman backward scattered light power generated by the nonlinear effect at the central station, the fiber-entering optical power is monitored in real time, and the damage caused by the burst of the optical fiber due to overhigh optical power is avoided. The invention monitors the reflected power by using a simple device at the transmitting end, and provides a protection scheme of real-time monitoring and low-delay control for a signal energy co-transmission system.

Description

Safety monitoring method and device of optical fiber energy information common transmission system
Technical Field
The invention relates to the technical field of photoelectricity and optical fiber communication, in particular to a safety monitoring method and device of an optical fiber energy information common transmission system.
Background
In a new generation of wireless communication system, in order to solve the contradiction between the shortage of wireless communication spectrum resources and the explosive increase of data traffic services, the working frequency band of wireless communication is expanding towards the millimeter wave and even terahertz frequency band. With the increase of the working frequency band of the radio frequency signal, the transmission loss of the signal in the air is greatly increased, the diffraction capability is weakened, and the coverage area of a single base station is reduced. In order to ensure the coverage area, the number of required base stations is increased sharply, and operators face the problems of sharply increased total power consumption and hardware cost, and difficulty in supplying power to a large number of base stations. In addition, when a communication system is quickly cleared after a natural disaster occurs and a base station in a remote area is erected, local power taking of communication equipment is difficult. The energy information co-transmission technology based on the optical fibers can solve the problems, and the optical energy and the optical information are transmitted to the base station through one optical fiber, so that the remote autonomous power supply of the base station is realized, and the communication function of the central station and the base station is also realized.
Because the energy light power transmitted by the optical fiber energy information common transmission system is high, once laser leaks, the optical fiber energy information common transmission system can cause serious damage to eyes and skin of people, and has potential safety hazard particularly in an indoor micro base station application scene. Moreover, real-time monitoring and evaluation of the working state of the system link is beneficial to the warning and response of faults. Therefore, the invention provides a safety monitoring method and a safety monitoring device for an optical fiber energy information common transmission system, which utilize simple devices to monitor the reflected power at a transmitting end and provide a protection scheme with real-time monitoring and low-delay control for the optical fiber energy information common transmission system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a safety monitoring method and a safety monitoring device of an optical fiber energy information common transmission system.
The purpose of the invention is realized by the following technical scheme: a safety monitoring method of an optical fiber energy information common transmission system comprises the following steps:
s1: obtaining Rayleigh scattered light, Brillouin scattered light and Raman backscattered light generated by energy light in an optical fiber;
s2: the Rayleigh scattering light, the Brillouin scattering light and the Raman backscattered light are transmitted to the second port of the optical circulator through the optical coupler and are output to the second optical wavelength division multiplexer from the third port of the optical circulator, and are divided into three paths by the second optical wavelength division multiplexer and then respectively enter the energy supply laser control system to obtain Rayleigh scattering light power PE1Brillouin scattering light power PE2Raman backward scattering light power PE3；
S3: the energy supply laser control system respectively measures Rayleigh threshold values P of Rayleigh scattering light, Brillouin scattering light and Raman backward scattering lightRBrillouin threshold value PSBSAnd Raman threshold PSRSAnd calculating Rayleigh scattered light measurement threshold value PE1-R＝γ1*PRBrillouin scattering light measurement threshold value PE2-SBS＝γ2*PSBSRaman backscattered light measurement threshold value PE3-SRS＝γ3*PSRS0.1 of<γ1<0.5，0.1<γ2<0.5，0.1<γ3<0.5；
S4: the Rayleigh scattered light power PE1Brillouin scattering light power PE2Raman backward scattering light power PE3Less than Rayleigh scattered light measurement threshold PE1-RBrillouin scattering light measurement threshold value PE2-SBSRaman backscattered light measurement threshold value PE3-SRSWhen the energy supply laser works normally.
The central wavelengths of the Rayleigh scattered light, the Brillouin scattered light and the Raman backward scattered light are respectively lambda2、λ2+△λ1、λ2+△λ2Respectively enter a Rayleigh scattering light port, a Brillouin scattering light port and a Raman backscattering light port of the energy supply laser control system, and the delta lambda1For the wavelength difference corresponding to the stimulated Brillouin frequency shift, said Δ λ2Is the wavelength difference corresponding to the raman backscattered light.
The step S4 further includes the following cases:
the method comprises the following steps: when the optical fiber is worn or broken, Fresnel reflection occurs in the optical fiber by energy light, the power of Rayleigh scattered light is suddenly increased, and the power P of Rayleigh scattered light received by a Rayleigh scattered light port of an energy supply laser control systemE1Above the Rayleigh scattering light measurement threshold PE1-RThe energy supply laser control system sends out a type 1 alarm and turns off the energy supply laser;
secondly, the step of: when the energy supply laser uses a high-power energy supply laser with narrow line width, and the energy light power PE2Exceeding the Brillouin threshold PSBSThe energy light generates a wavelength shift quantity delta lambda in the optical fiber transmission process1The power P of the brillouin scattering light received by the brillouin scattering light port of the energy supply laser control systemE2Is higher than the Brillouin scattering light measurement threshold value PE2-SBSThe energizing laser control system issues a type 2 alarm and turns off the energizing laser.
③: when the energy supply laser uses a high-power energy supply laser with wide line width, and the energy light power PHPLDExceeding the Raman threshold PSRSThe wavelength offset of the energy light generated in the optical fiber transmission process is delta lambda2The power P of the Raman backscattered light received by the Raman backscattered light port of the energized laser control systemE3Above the Raman backscattered light measurement threshold PE3-SRSThe energizing laser control system issues a type 3 alarm and turns off the energizing laser.
The utility model provides a safety monitoring device of optic fibre energy information system of passing altogether, includes second optical wavelength division multiplexer, energy supply laser instrument and is used for the energy supply laser instrument control system of analytic power, second optical wavelength division multiplexer is connected with energy supply laser instrument control system, energy supply laser instrument control system is connected with the energy supply laser instrument.
Further, the energy supply laser control system includes a rayleigh scattered light port, a brillouin scattered light port, and a raman backscattered light port, the second optical wavelength division multiplexer is connected to the rayleigh scattered light port, the brillouin scattered light port, and the raman backscattered light port, respectively, the rayleigh scattered light port is used for measuring power of rayleigh scattered light and comparing with a rayleigh scattered light measurement threshold, the brillouin scattered light port is used for measuring power of brillouin scattered light and comparing with a brillouin scattered light measurement threshold, and the raman backscattered light port is used for measuring power of raman backscattered light and comparing with a raman backscattered light measurement threshold.
The transmission fiber may be a single mode fiber, a multimode fiber, a multi-core fiber, a double-clad fiber, or the like.
In the central station, a first port of the optical circulator receives energy light output by the energy supply laser, and the energy light is output to the optical coupler through a second port of the optical circulator and then is transmitted to the base station through the optical fiber by the optical coupler. The energy light can generate Rayleigh scattered light, Brillouin scattered light and Raman backward scattered light in the optical fiber, the three kinds of reflected light are transmitted to the second port of the optical circulator through the optical coupler and are output to the second optical wavelength division multiplexer from the third port of the optical circulator, the reflected light is divided into three paths through the second optical wavelength division multiplexer and then respectively enters the energy supply laser control system, and Rayleigh scattered light power P is obtainedE1Brillouin scattering light power PE2Raman backward scattering light power PE3. Once the monitoring power exceeds the Rayleigh scattering light measurement threshold, the Brillouin scattering light measurement threshold and the Raman backward scattering light measurement threshold range, the energy supply laser control system gives an alarm and closes the energy supply laser, and follow-up staff carries out troubleshooting. The energy light is shunted in the base station through the first wavelength division multiplexer, and the energy light is converted into electric energy by the photovoltaic converter to supply power for the first photoelectric detector and the electric amplifier in the base station. The laser is used for providing an optical carrier, a data signal is loaded on the optical carrier by using the electro-optical modulator, the optical carrier passes through the optical isolator and then is coupled with energy light through the optical coupler, and then the energy light is transmitted to a far-end base station through an optical fiber. The base station is shunted by a first wavelength division multiplexer, and is subjected to photoelectric conversion by a first photoelectric detector, amplified by an electric amplifier and finally transmitted by an antenna.
The beneficial effects of the invention are:
1. the power analysis is carried out on the reflected light by the energy supply laser control system, so that the on-off of the energy supply laser is controlled.
2. The invention converts energy light into electric energy through a photovoltaic converter to supply power for a first photoelectric detector and an electric amplifier.
Drawings
FIG. 1 is a schematic view of the present invention;
in the figure: the system comprises a laser 1, an electro-optical modulator 2, an optical isolator 3, an optical coupler 4, an optical fiber 5, a first optical wavelength division multiplexer 6, a first photoelectric detector 7, an electric amplifier 8, an antenna 9, an energy supply laser 10, an optical circulator 11, a photovoltaic converter 12, a second optical wavelength division multiplexer 13 and an energy supply laser control system 14.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention is further described with reference to the following figures and specific embodiments.
The dashed lines with arrows in fig. 1 represent circuits and the solid lines represent light paths.
As shown in FIG. 1, a safety monitoring method and device for optical fiber energy information common transmission system, an energy supply laser 10 generates a central wavelength λ2Power of PHPLDThe first port of the optical circulator 11 receives the high power energy light, and the high power energy light passes through the optical circulator 11Is output to the optical coupler 4 and is coupled into a multimode optical fiber 5 through the optical coupler 4. The high-power energy light generates Rayleigh scattering light, Brillouin scattering light and Raman backward scattering light in the multimode fiber 5, the three kinds of reflected light pass through the optical coupler 4 to the second port of the optical circulator 11 and are output to the second optical wavelength division multiplexer 13 from the third port of the optical circulator 11, and the reflected light is divided into three paths through the second optical wavelength division multiplexer 13, the central wavelengths of the three paths are lambda respectively2、λ2+△λ1、λ2+△λ2The optical signal enters a Rayleigh scattering optical port, a Brillouin scattering optical port and a Raman backscattering optical port of the high-power energy supply laser control system 14, and the high-power energy supply laser control system 14 respectively controls Rayleigh scattering optical power P of the three portsE1Brillouin scattering light power PE2Raman backward scattering light power PE3Performing an analysis, wherein1For the wavelength difference, Delta lambda, corresponding to the stimulated Brillouin frequency shift2Is the wavelength difference corresponding to the raman backscattered light. The high power powered laser control system 14 measures the rayleigh threshold P of the rayleigh scattered light, the brillouin scattered light, and the raman backscattered light, respectivelyRBrillouin threshold value PSBSAnd Raman threshold PSRSAnd calculating Rayleigh scattered light measurement threshold value PE1-R＝γ1*PRBrillouin scattering light measurement threshold value PE2-SBS＝γ2*PSBSRaman backscattered light measurement threshold value PE3-SRS＝γ3*PSRS0.1 to<γ1<0.5，0.1<γ2<0.5，0.1<γ3<0.5；
When the high power energy laser 10 outputs the high power energy optical power PHPLDBelow the brillouin threshold PSBSAnd Raman threshold PSRSAnd the optical power P measured by three ports of the high power powered laser control system 14 when the optical fiber is intactE1、PE2And PE3Are respectively less than Rayleigh scattered light measurement threshold value PE1-RBrillouin scattering light measurement threshold value PE2-SBSRaman backscattered light measurement threshold value PE3-SRSAnd the signal energy co-transmission system works normally. Optical fiber transmission systemAbrasion or breakage exists, Fresnel reflection occurs to high-power energy light in the multimode optical fiber 5, the power of Rayleigh scattered light suddenly increases, and the power P of Rayleigh scattered light received by a Rayleigh scattered light port of the high-power energy laser control system 14E1Above the Rayleigh scattering light measurement threshold PE1-RThe high power powered laser control system 14 issues a type 1 alarm and automatically turns off the high power powered laser 10. When the high-power energy supply laser 10 uses the narrow-linewidth high-power energy supply laser 10, and the energy light power PHPLDExceeding the Brillouin threshold PSBSThe energy light will generate a wavelength shift quantity delta lambda in the transmission process of the optical fiber 51The brillouin scattering light received at the brillouin scattering light port of the high power powered laser control system 14, and the brillouin scattering light power P at that timeE2Is higher than the Brillouin scattering light measurement threshold value PE2-SBSThe high power powered laser control system 14 issues a type 2 alarm and turns off the high power powered laser 10. When the high power energy supply laser 10 uses the high power energy supply laser 10 with wide line width, and the energy light power PHPLDExceeding the Raman threshold PSRSThe energy light generates a wavelength shift quantity delta lambda in the transmission process of the optical fiber 52The raman backscattered light received by the raman backscattered light port of the high power powered laser control system 14, at this time, the raman backscattered light power P is received by the raman backscattered light port of the high power powered laser control system 14E3Is higher than the Raman backward scattering light measurement threshold value PE3-SRSThe high power energized laser control system 14 issues a type 3 alarm and shuts down the high power laser 10, followed by a subsequent troubleshooting of the system by personnel.
The laser 1 has a central wavelength of λ2The optical carrier generated by the laser 1 passes through a Mach-Zehnder electro-optic modulator 2 working in a push-pull mode, and the Mach-Zehnder electro-optic modulator 2 converts the frequency f into a narrow-linewidth distributed feedback laser (DFB-LD)1RFThe radio frequency signal is loaded on an optical carrier to obtain modulated signal light, the modulated signal light passes through an optical isolator 3 to isolate energy reflected light, the laser 1 and the Mach-Zehnder electro-optic modulator 2 are prevented from being damaged by the reflected light, and the modulated signal and high-power energy light are coupled into more than one same optical coupler 4A mode optical fiber 5. After the coupled light is transmitted to the remote base station, the modulated signal light is separated from the high power energy light using the first wavelength division multiplexer 6. The high-power energy light has the matched wavelength of lambda2High power photovoltaic converter 12 has a conversion success rate of apHPLDWhere α is the conversion efficiency of the overall system energy, the power supplies the drive voltage to the highly saturated first photodetector 7 and electrical amplifier 8 in the base station. The modulated signal light is subjected to photoelectric conversion by the first photoelectric detector 7, amplified by the electric amplifier 8, and finally emitted from the antenna 9, so that the communication function of the central station and the base station is realized.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and is not to be construed as limited to the exclusion of other embodiments, and that various other combinations, modifications, and environments may be used and modifications may be made within the scope of the concepts described herein, either by the above teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. A safety monitoring method of an optical fiber energy information common transmission system is characterized by comprising the following steps:
s1: obtaining Rayleigh scattered light, Brillouin scattered light and Raman backscattered light generated by energy light in an optical fiber (5);
s2: the Rayleigh scattered light, the Brillouin scattered light and the Raman backscattered light pass through the optical coupler (4) to the input end of the optical circulator (11), are output to the second optical wavelength division multiplexer (13) from the output end of the optical circulator (11), are divided into three paths by the second optical wavelength division multiplexer (13), and then respectively enter the energy supply laser control system (14) to obtain Rayleigh scattered light power
Figure DEST_PATH_IMAGE001
Brillouin scattering light power
Figure DEST_PATH_IMAGE002
Raman backward scattering power
Figure DEST_PATH_IMAGE003
；
S3: an energy supply laser control system (14) measures Rayleigh threshold values of Rayleigh scattered light, Brillouin scattered light and Raman backscattered light respectively
Figure DEST_PATH_IMAGE004
Brillouin threshold
Figure DEST_PATH_IMAGE005
And Raman threshold
Figure DEST_PATH_IMAGE006
And calculating Rayleigh scattering light measurement threshold
Figure DEST_PATH_IMAGE007
Brillouin scattering light measurement threshold
Figure DEST_PATH_IMAGE008
Raman back scattering light measurement threshold
Figure DEST_PATH_IMAGE009
Wherein 0.1<γ1<0.5，0.1<γ2 <0.5，0.1<γ3<0.5；
S4: the Rayleigh scattered light power
Figure 399380DEST_PATH_IMAGE001
Brillouin scattering light power
Figure 785362DEST_PATH_IMAGE002
Raman backward scattering power
Figure 33941DEST_PATH_IMAGE003
Respectively less than Rayleigh scattered lightMeasuring threshold
Figure DEST_PATH_IMAGE010
Brillouin scattering light measurement threshold
Figure DEST_PATH_IMAGE011
Raman backward scattering light measurement threshold
Figure DEST_PATH_IMAGE012
When the energy supply laser (10) works normally.
2. The safety monitoring method of the optical fiber energy information co-transmission system according to claim 1, characterized in that: the central wavelengths of the Rayleigh scattered light, the Brillouin scattered light and the Raman backscattered light are respectively
Figure DEST_PATH_IMAGE013
、
Figure DEST_PATH_IMAGE014
、
Figure DEST_PATH_IMAGE015
Respectively enter a Rayleigh scattering light port, a Brillouin scattering light port and a Raman backscattering light port of an energy supply laser control system (14), and
Figure DEST_PATH_IMAGE016
a wavelength difference corresponding to the stimulated Brillouin frequency shift, said
Figure DEST_PATH_IMAGE017
Is the wavelength difference corresponding to the raman backscattered light.
3. The safety monitoring method of the optical fiber energy information co-transmission system according to claim 2, characterized in that: the step S4 further includes the following cases:
Figure DEST_PATH_IMAGE018
: when the optical fiber (5) is worn or broken, Fresnel reflection occurs to the energy light in the optical fiber (5), the power of Rayleigh scattered light is suddenly increased, and the power of Rayleigh scattered light received by a Rayleigh scattered light port of the energy laser control system (14)
Figure 383145DEST_PATH_IMAGE001
Above the Rayleigh scattering light measurement threshold
Figure 463096DEST_PATH_IMAGE010
The energizing laser control system (14) issues a type 1 alarm and turns off the energizing laser (10);
Figure DEST_PATH_IMAGE019
: when the energy supply laser (10) uses a high-power energy supply laser (10) with a narrow line width, and the energy light power
Figure DEST_PATH_IMAGE020
Exceeding the Brillouin threshold
Figure 692083DEST_PATH_IMAGE005
The energy light generates a wavelength shift amount in the transmission process of the optical fiber (5)
Figure 427958DEST_PATH_IMAGE016
The power of the Brillouin scattering light received by the Brillouin scattering light port of the energy supply laser control system (14) at the time
Figure 95700DEST_PATH_IMAGE002
Is higher than Brillouin scattering light measurement threshold
Figure 233420DEST_PATH_IMAGE011
Energy supplying laserThe light control system (14) issues a type 2 alarm and turns off the energizing laser (10);
Figure DEST_PATH_IMAGE021
: when the energy supply laser (10) uses a high-power energy supply laser (10) with a wide line width, and the energy light power
Figure 898888DEST_PATH_IMAGE020
Exceeding the Raman threshold
Figure 122059DEST_PATH_IMAGE006
The energy light generates wavelength offset in the transmission process of the optical fiber (5)
Figure 327912DEST_PATH_IMAGE017
At the time of the stimulated Raman backscattered light, the Raman backscattered light power received by the Raman backscattered light port of the energized laser control system (14)
Figure 116877DEST_PATH_IMAGE003
Above the Raman backscattered light measurement threshold
Figure 15562DEST_PATH_IMAGE012
The energizing laser control system (14) issues a type 3 alarm and turns off the energizing laser (10).
4. A safety monitoring device of an optical fiber energy information co-transmission system, the safety monitoring device comprising a safety monitoring method of the optical fiber energy information co-transmission system according to any one of claims 1 to 3, wherein: including second optical wavelength division multiplexer (13), energy supply laser (10) and be used for the energy supply laser control system (14) of assay power, second optical wavelength division multiplexer (13) is connected with energy supply laser control system (14), energy supply laser control system (14) are connected with energy supply laser (10).
5. The safety monitoring device of the optical fiber energy information co-transmission system according to claim 4, wherein: the energy supply laser control system (14) comprises a Rayleigh scattering light port, a Brillouin scattering light port and a Raman backscattering light port, the second optical wavelength division multiplexer (13) is respectively connected with the Rayleigh scattering light port, the Brillouin scattering light port and the Raman backscattering light port, and the Rayleigh scattering light port is used for measuring the power of Rayleigh scattering light and measuring a threshold value with the Rayleigh scattering light
Figure 726029DEST_PATH_IMAGE010
Comparing the Brillouin scattering light port with the Brillouin scattering light measurement threshold
Figure 469995DEST_PATH_IMAGE011
Comparing the power of the Raman backward scattering light with a Raman backward scattering light measurement threshold value
Figure 582307DEST_PATH_IMAGE012
A comparison is made.
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Real-time monitoring in passive optical networks using a superluminescent LED with uniform and phase-shifted fiber Bragg gratings;Nani Fadzlina Naim; Mohammad Syuhaimi Ab-Rahman; Hesham A. Bakar;《Journal of Optical Communications and Networking》;20131217;第5卷(第12期);全文 *
杨海林 ; 刘丽娟 ; 彭迪 ; 许鸥 ; 秦玉文.光纤信能共传技术研究进展.《光学学报》.2021, *

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