CN108834005B - Passive optical fiber network system with adjustable power and control method thereof - Google Patents

Passive optical fiber network system with adjustable power and control method thereof Download PDF

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CN108834005B
CN108834005B CN201810810824.3A CN201810810824A CN108834005B CN 108834005 B CN108834005 B CN 108834005B CN 201810810824 A CN201810810824 A CN 201810810824A CN 108834005 B CN108834005 B CN 108834005B
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optical
network
power
light source
pump light
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CN108834005A (en
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符小东
缪冬青
揭水平
王寅
程惠全
何伟
房洪莲
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Zhongtian Communication Technology Co., Ltd
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Zhongtian Communication Technology Co ltd
Zhongtian Broadband Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
    • H04B10/2942—Signal power control in a multiwavelength system, e.g. gain equalisation using automatic gain control [AGC]
    • 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
    • H04B10/564—Power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects

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Abstract

The invention discloses a passive optical fiber network system with adjustable power and a control method thereof, wherein the passive optical fiber network system comprises a central control station, an optical line terminal unit, an optical distribution network unit and an optical network unit, wherein the central control station is provided with a network manager, receives an alarm to trigger the adjustment of a pump light source power supply, and realizes the output of different pump light powers; the optical line terminal unit comprises OLT equipment, a first optical filter, an optical coupler, an optical isolator and a pumping light source; the optical distribution network unit comprises an erbium-doped optical fiber, a second optical filter and an optical splitter; the optical network unit comprises a plurality of ONU terminal devices. The invention solves the problem of insufficient optical power of the user ONU terminal in the using process.

Description

Passive optical fiber network system with adjustable power and control method thereof
Technical Field
The invention relates to a passive optical fiber network system and a control method thereof, in particular to a passive optical fiber network system with adjustable power and a control method thereof.
Background
The PON (passive optical network) does not contain any electronic devices and electronic power supplies (in the optical distribution network), and the ODN is composed of all passive devices such as an optical Splitter (Splitter), and does not require expensive active electronic devices. A passive optical network includes an Optical Line Terminal (OLT) mounted to a central control station and a plurality of associated Optical Network Units (ONUs) mounted to subscriber sites. An Optical Distribution Network (ODN) between the OLT and the ONUs includes optical fibers and passive optical splitters or couplers, and a typical networking architecture is schematically shown in fig. 2.
An optical splitter, also called an optical splitter, is one of the important passive devices in an optical fiber link, and is an optical fiber junction device having a plurality of input ends and a plurality of output ends. The optical splitter can be divided into a fused biconical taper type and a planar waveguide type (PLC type) according to the light splitting principle.
The splitting ratio of the optical splitter used in the existing PON network refers to the number of branches of the optical splitter and the ratio of optical power on each branch. In the prior art, optical splitters are all optical splitters with a fixed splitting ratio, from 1: 2-1: 128. 2: 2-2: 128 are unequal. The internal structure is composed of multiple stages 1: 2 is implemented in cascade. The number of branches of the optical splitter and the splitting ratio remain unchanged for input optical signals of different wavelengths. In the current network construction, once the ODN optical splitter selects the corresponding optical splitter, the network coverage of the user is fixed.
In network operation and maintenance, the existing optical splitter with a fixed splitting ratio has the problem of insufficient optical power in the practical operation and maintenance of a PON network, so that the use perception of the in-use service is influenced, and a part of branch optical paths cannot perform new services due to insufficient power budget. Aiming at the situation that the user number increasing scene cannot be opened due to insufficient power budget, an optical splitter with few branches can be newly and additionally deployed, but more precious resources such as trunk access optical fibers and PON ports need to be consumed.
Aiming at the situation that the optical power of a user is insufficient or even the service expansion is not satisfied under the scenes of the existing PON network such as the existence of optical splitters, such as a large branch number optical splitter or secondary light splitting, different solutions are applied as usual. For example, in terms of adjusting the splitting ratio of the splitter, a solution to the optical power difference caused by the large difference in the distances between different users in some single PON ports is implemented, for example, patent application No. 201310140470.3 discloses a power-adjustable optical splitter, which changes the refractive index of the liquid crystal by controlling the magnitude of the voltage through an electronic control module to implement redistribution of the power of the input optical signal at the output port. Also, for example, patent application No. 201710629624.3 discloses a 2X2 optical splitter that achieves different electrical adjustments, primarily through a thermal modulation assembly, to achieve splitting ratio adjustments at different wavelengths. Patent application No. 201220096159.4 discloses a technical scheme of an adjustable optical power distributor and its amplifier, which realizes the arbitrary adjustment of optical power distribution by rotating the angle of the fast and slow axes of polarized light that is transmitted into polarization-maintaining fiber.
In the prior art, as described above, the function of redistributing optical power can be realized by adjusting the splitting ratio of the optical splitter, so that the link optical power of the PON network is improved, and the requirements of some branch optical paths are met. But has the following disadvantages:
1. the technical schemes involved in the above methods all require active (applied voltage) and other modes to realize the change of the splitting ratio, and some schemes also involve PON networks requiring multiple wavelengths, such as patent application No. 201710629624.3, which do not satisfy the application scenario of the existing network passive optical networks, for example, optical splitters in optical junction boxes are all passive devices and do not have power supply introduction conditions.
2. In the PON network, when the input optical power is a fixed value, the splitting ratio of the optical splitter is adjusted to satisfy another part of the branch optical paths by sacrificing the optical power of part of the branch optical paths, that is, there is a problem that the optical power of another part of the branch optical paths may be insufficient in order to solve the branch optical paths with insufficient power.
3. And meanwhile, the normal use of the service is easily influenced by the increase of the loss of a trunk or a branch optical cable in the later period due to the redistribution adjustment of the optical power of part of the branch optical paths.
Disclosure of Invention
The invention aims to solve the technical problem of providing a passive optical network system with adjustable power and a control method thereof, and solves the problem of insufficient optical power of a user ONU terminal in the using process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a passive optical network system with adjustable power is characterized in that: comprises a central control station, an optical line terminal unit, an optical distribution network unit and an optical network unit,
the central control station is provided with a network management for receiving alarm and triggering the adjustment of the pumping light source power supply to realize the output of different pumping light powers;
the optical line terminal unit comprises OLT equipment, a first optical filter, an optical coupler, an optical isolator and a pumping light source, wherein one end of the OLT equipment and one end of the pumping light source are respectively connected with a network management of the central control station, the other end of the OLT equipment is connected with one end of the first optical filter, the other end of the first optical filter is connected with one end of the optical coupler, the other end of the optical coupler is connected with one end of the optical isolator, and the other end of the optical isolator is connected with the other end of the pumping light source;
the optical distribution network unit comprises an erbium-doped optical fiber, a second optical filter and an optical splitter, wherein one end of the erbium-doped optical fiber is connected with the third end of the optical coupler through a trunk optical cable, one end of the second optical filter is connected with the other end of the erbium-doped optical fiber, and the other end of the second optical filter is connected with one end of the optical splitter;
the optical network unit comprises a plurality of ONU terminal equipment, and each ONU terminal equipment is connected with one branch at the other end of the optical splitter through a distribution optical cable.
Further, the network manager is used for displaying alarm information of equipment and optical cables of the passive optical network, and performing alarm query, data configuration and change operation on the equipment.
Further, the OLT device is configured to allocate and converge services of the optical network unit, where a downlink wavelength used by the OLT device is 1550nm and an uplink wavelength used by the OLT device is 1310 nm.
Further, the pump light source uses the wavelength of 980nm, and the first optical filter and the second optical filter are band elimination filters for preventing the light with the wavelength of 980nm from passing through.
Further, the erbium-doped fiber optically amplifies the 1550nm wavelength by a pump light source,
gain of erbium doped fiber
Figure GDA0002629384000000041
Wherein GA is gain，gRIs a gain factor, PPTo pump the optical power, AeffIs the effective area of the fiber core, LeffThe effective length of the optical fiber is,
Figure GDA0002629384000000042
l is the length of the optical fiber, apThe attenuation coefficient of the optical fiber to the pump light;
according to the formula, the gain is in direct proportion to the pumped light power, the pumping light power is controlled by adjusting the current of the pumping light source, so that the gain of the signal light is controlled, and the power adjustable function of the PON network is realized.
Further, the ONU terminal device is configured to provide a plurality of service interfaces to a user.
A control method of a passive optical network system with adjustable power is characterized by comprising the following steps:
the method comprises the following steps: completing the light path construction and the network management link construction of the passive optical network system with adjustable power;
step two: the passive optical fiber network system with adjustable power is electrified and works normally;
step three: when weak light of the passive optical network occurs in a service use stage or an opening stage, equipment of the passive optical network detects the shortage of optical power and reports an alarm to a network manager;
step four: the network management triggers a command for adjusting the current of the pump light source, and the pump light source adjusts the current value according to the received command so as to output pump light with the wavelength of 980 nm;
step five: after passing through the optical isolator, the pump light is coupled between the coupler and main signal light emitted by OLT equipment, enters a main optical cable and is transmitted to the erbium-doped optical fiber to carry out optical amplification on the power of the main signal light;
step six: the amplified main signal light and the pump light are filtered at the optical filter, the amplified main signal light enters the optical splitter, and the optical power of each branched optical path is improved.
Further, the second step is specifically to power up the equipment related to the passive optical network, complete the opening of the PON network service through the network manager, and finally transmit the main signal light emitted by the OLT equipment to the ONU terminal equipment of the optical network unit through the first optical filter, the optical coupler, the trunk optical cable, the erbium-doped optical fiber, the second optical filter, and the optical splitter, so as to complete the downlink signal transmission of the PON network.
And further, the alarm in the third step is displayed through a network manager, and the display mode is graphical or acousto-optic display.
Further, in the sixth step, the output optical power of the pump light is continuously adjusted and increased, so that the final light receiving of the ONU terminal device is 2dB above the threshold value, and after the light receiving of the ONU terminal device is 2dB above the threshold value, the network manager stops adjusting the pump light source again according to the received optical power parameter, and keeps outputting the stable value of the pump light source.
Compared with the prior art, the invention has the following advantages and effects:
1. the light distribution unit totally uses passive optical devices to realize the output optical power change of the optical splitter in an active (external voltage) mode, and realizes an adjustable function on the optical power of the PON network.
2. The optical power adjustment of the PON network can realize the optical power adjustment of each branch optical path of the whole optical splitter, and the optical power of part of the branch optical paths is avoided being solved by sacrificing the power of other branch optical paths.
3. The optical splitter can adjust the gain of optical power in the trunk part, and can enlarge the range of the coverage radius under the condition of not influencing the available quantity of the original users so as to meet the coverage use of services.
4. The PON network is easy to upgrade and reform on the basis of the original PON network, and the difficulty of redeploying the network is reduced.
Drawings
Fig. 1 is a schematic diagram of a passive optical fiber network system with adjustable power according to the present invention.
Fig. 2 is a schematic diagram of a prior art fiber optic network.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
As shown in fig. 1, a passive optical fiber network system with adjustable power of the present invention includes a central control station 1, an optical line terminal unit 2, an optical distribution network unit 3 and an optical network unit 4,
the central control station 1 is provided with a network management 5 for receiving alarm and triggering the adjustment of the pumping light source power supply to realize the output of different pumping light powers; the network manager is used for displaying the alarm information of the equipment and the optical cable of the passive optical network and performing alarm query, data configuration and change operation on the equipment.
The optical line terminal unit 2 comprises an OLT device 6, a first optical filter 7, an optical coupler 8, an optical isolator 9 and a pumping light source 10, wherein one end of the OLT device 6 and one end of the pumping light source 10 are respectively connected with the network management 5 of the central control station 1, the other end of the OLT device 6 is connected with one end of the first optical filter 7, the other end of the first optical filter 7 is connected with one end of the optical coupler 8, the other end of the optical coupler 8 is connected with one end of the optical isolator 9, and the other end of the optical isolator 9 is connected with the other end of the pumping light source 10;
the optical distribution network unit 3 comprises an erbium-doped fiber 11, a second optical filter 12 and an optical splitter 13, wherein one end of the erbium-doped fiber 11 is connected with the third end of the optical coupler 8 through a trunk optical cable 14, one end of the second optical filter 12 is connected with the other end of the erbium-doped fiber 11, and the other end of the second optical filter 12 is connected with one end of the optical splitter 13;
the optical network unit 4 includes a plurality of ONU terminal devices 15, and each ONU terminal device 15 is connected to one branch at the other end of the optical splitter 13 via a distribution cable 16.
The OLT device is a key device of the PON network, and is used for service allocation and convergence of optical network units, and in the embodiment of the present invention, the downlink wavelength used by the OLT device is 1550nm, and the uplink wavelength used by the OLT device is 1310 nm.
The pumping light source can be external or internal OLT type, and the external type is used in this embodiment. The pump wavelengths can be 980nm and 1480nm, with the 980nm wavelength used in this embodiment. The pump output optical power is proportional to the square of the current. The first optical filter and the second optical filter are band-stop filters that block the 980nm wavelength from passing through. The optical isolator is a one-way pass device and aims to isolate reflected wavelengths to pump light sources. The optical coupler is used for coupling the main signal light emitted by the OLT and the pump light of 980nm emitted by the pump light source into the fiber core of the main optical cable.
Erbium-doped fibers are erbium ion-doped fibers that optically amplify the 1550nm operating wavelength by pump light (980nm or 1480nm wavelength pump light). The length of the erbium-doped fiber may be several tens of meters, etc., and the length of the erbium-doped fiber is 30nm in this embodiment. In addition, as the amplified optical fiber, the optical fiber of the segment can be replaced by other doped optical fibers, such as praseodymium doped optical fiber, according to the requirement, and the purpose of carrying out optical amplification on different working wavelengths is achieved.
Gain of erbium doped fiber
Figure GDA0002629384000000081
Wherein GA is gain (amplification factor), gRIs a gain factor, PPTo pump the optical power, AeffIs the effective area of the fiber core, LeffThe effective length of the optical fiber is,
Figure GDA0002629384000000082
l is the length of the optical fiber, apThe attenuation coefficient of the optical fiber to the pump light;
according to the formula, the gain is in direct proportion to the pumped light power, the pumping light power is controlled by adjusting the current of the pumping light source, so that the gain of the signal light is controlled, and the power adjustable function of the PON network is realized. The gain value of the erbium-doped fiber can be ensured to be more than 20dB, and the power adjustable range of the PON network is met.
The beam splitter may be from 1: 2-1: 128. 2: 2-2: 128, which has the main function of splitting the optical power of the main signal light equally into each branch.
An ONU terminal device is a fiber access terminal device that provides multiple service interfaces to a user. The Optical Network Unit (ONU) has the functions of optical/electrical conversion and electrical/optical conversion, and simultaneously has the functions of digital/analog and analog/digital conversion for voice signals, multiplexing, signaling processing and maintenance management. In cooperation with the OLT, the ONU may provide various broadband services to connected users. Such as internet surfing, VoIP, HDTV. Distribution optical fiber, trunk optical fiber, and the like, relate to various types including g.652 type optical fiber, g.655 type optical fiber, 48-core optical fiber, 96-core optical fiber, 128-core optical fiber, and the like.
A control method of a passive optical network system with adjustable power comprises the following steps:
the method comprises the following steps: completing the construction of a light path and a network management link of the passive optical network system with adjustable power;
step two: the passive optical fiber network system with adjustable power is electrified and works normally; the equipment related to the passive optical network is powered on, the PON network service is opened through the network management, main signal light emitted by the OLT equipment is finally transmitted to ONU terminal equipment of the optical network unit through the first optical filter, the optical coupler, the main optical cable, the erbium-doped optical fiber, the second optical filter and the optical splitter, and downlink signal transmission of the PON network is completed.
Step three: when weak light of the passive optical network occurs in a service use stage or an opening stage, equipment of the passive optical network detects the shortage of optical power and reports an alarm to a network manager; the alarm is displayed through the network management, and the display mode is graphic or acousto-optic display.
Step four: the network management triggers a command for adjusting the current of the pump light source, and the pump light source adjusts the current value according to the received command so as to output pump light with the wavelength of 980 nm;
step five: after passing through the optical isolator, the pump light is coupled between the coupler and main signal light emitted by OLT equipment, enters a main optical cable and is transmitted to the erbium-doped optical fiber to carry out optical amplification on the power of the main signal light;
step six: the amplified main signal light and the pump light are filtered at the optical filter, the amplified main signal light enters the optical splitter, and the optical power of each branched optical path is improved.
And after the received light of the ONU terminal equipment is 2dB above the threshold value, the network management stops readjusting the pumping light source according to the received light power parameter, and keeps stable value output of the pumping light source.
The working principle of the invention is as follows: when the system is set up, the passed optical path and the Ethernet cable are connected, wherein the network management, the OLT equipment and the pumping light source equipment are connected into the network cable, and the rest are optical fiber links. After the physical link of the system is built, each in-use ONU service is configured through a network manager, under the normal condition, main signal light emitted by an OLT passes through a filter, then passes through a coupler, then passes through a fiber core of a main optical cable, enters an erbium-doped optical fiber of a distribution unit, then passes through an optical filter, enters an optical splitter, evenly splits the optical power to the fiber core of each branch optical cable according to the used splitting ratio, and finally reaches a user terminal of the ONU, and under the normal condition of ONU light receiving, the service can be normally used. When the received light of the ONU is in weak light receiving, the OLT equipment detects that the ONU is in a light receiving threshold, triggers a weak light alarm to a network management, and triggers the current adjustment of the pump light when the network management receives the weak light alarm, thereby realizing the output of the pump light. At this time, the optical signal with service information of the OLT device and the pump light are coupled in the optical coupler and enter the fiber core of the trunk optical cable, and then are transmitted to the erbium-doped fiber of the optical distribution unit, after passing through the erbium-doped fiber, the optical signal with service is optically amplified, and the remaining pump light is filtered out in the optical filter. The amplified signal light passes through the optical filter and then is transmitted to the optical splitter, optical power distribution is carried out on the fiber core of each branch, the distributed optical power is stronger than the original optical power, and finally the purpose that the received light of the ONU terminal can be adjusted to a normal value range is achieved, and normal and stable use of ONU services is achieved.
The above description of the present invention is intended to be illustrative. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims (7)

1. A passive optical network system with adjustable power is characterized in that: comprises a central control station, an optical line terminal unit, an optical distribution network unit and an optical network unit,
the central control station is provided with a network management for receiving alarm and triggering the adjustment of the pumping light source power supply to realize the output of different pumping light powers;
the optical line terminal unit comprises OLT equipment, a first optical filter, an optical coupler, an optical isolator and a pumping light source, wherein one end of the OLT equipment and one end of the pumping light source are respectively connected with a network management of the central control station, the other end of the OLT equipment is connected with one end of the first optical filter, the other end of the first optical filter is connected with one end of the optical coupler, the other end of the optical coupler is connected with one end of the optical isolator, and the other end of the optical isolator is connected with the other end of the pumping light source;
the optical distribution network unit comprises an erbium-doped optical fiber, a second optical filter and an optical splitter, wherein one end of the erbium-doped optical fiber is connected with the third end of the optical coupler through a trunk optical cable, one end of the second optical filter is connected with the other end of the erbium-doped optical fiber, and the other end of the second optical filter is connected with one end of the optical splitter;
the optical network unit comprises a plurality of ONU terminal equipment, and each ONU terminal equipment is connected with one branch at the other end of the optical splitter through a distribution optical cable;
the OLT equipment is used for service distribution and convergence of the optical network unit, and the used downlink wavelength is 1550nm and the uplink wavelength is 1310 nm;
the pump light source uses the wavelength of 980nm, and the first optical filter and the second optical filter are band elimination filters for preventing the light with the wavelength of 980nm from passing through;
the erbium-doped fiber optically amplifies 1550nm wavelength by a pump light source,
gain of erbium doped fiber
Figure FDA0002605537750000011
Wherein GA is gain, gRIs a gain factor, PPTo pump the optical power, AeffIs the effective area of the fiber core, LeffThe effective length of the optical fiber is,
Figure FDA0002605537750000021
l is the length of the optical fiber, apThe attenuation coefficient of the optical fiber to the pump light;
according to the formula, the gain is in direct proportion to the pump light power, the pump light power is controlled by adjusting the current of the pump light source, the gain of the signal light is controlled, and the power adjustable function of the PON network is achieved.
2. A power scalable passive optical network system according to claim 1, wherein: the network manager is used for displaying the alarm information of the equipment and the optical cable of the passive optical network and performing alarm query, data configuration and change operation on the equipment.
3. A power scalable passive optical network system according to claim 1, wherein: and the ONU terminal equipment is used for providing a plurality of service interfaces for users.
4. A control method of a passive optical network system with adjustable power is characterized by comprising the following steps:
the method comprises the following steps: completing the construction of a light path and a network management link of the passive optical fiber network system with adjustable power as claimed in any one of claims 1-3;
step two: the passive optical fiber network system with adjustable power is electrified and works normally;
step three: when weak light of the passive optical network occurs in a service use stage or an opening stage, equipment of the passive optical network detects the shortage of optical power and reports an alarm to a network manager;
step four: the network management triggers a command for adjusting the current of the pump light source, and the pump light source adjusts the current value according to the received command so as to output pump light with the wavelength of 980 nm;
step five: after passing through the optical isolator, the pump light is coupled between the coupler and main signal light emitted by OLT equipment, enters a main optical cable and is transmitted to the erbium-doped optical fiber to carry out optical amplification on the power of the main signal light;
step six: the amplified main signal light and the pump light are filtered at the optical filter, the amplified main signal light enters the optical splitter, and the optical power of each branched optical path is improved.
5. The method of claim 4, wherein the method further comprises: and step two, specifically, the equipment related to the passive optical network is powered on, the opening of the PON network service is completed through the network manager, and the main signal light emitted by the OLT equipment is finally transmitted to the ONU terminal equipment of the optical network unit through the first optical filter, the optical coupler, the trunk optical cable, the erbium-doped optical fiber, the second optical filter and the optical splitter, so that the downlink signal transmission of the PON network is completed.
6. The method of claim 4, wherein the method further comprises: and the alarm in the third step is displayed through a network manager in a graphic or acousto-optic display mode.
7. The method of claim 4, wherein the method further comprises: in the sixth step, the output optical power of the pump light is continuously adjusted and increased, so that the final 2dB of the received light of the ONU terminal equipment is above the threshold value, and after the 2dB of the received light of the ONU terminal equipment is above the threshold value, the network manager stops adjusting the pump light source according to the received optical power parameter, and keeps the stable value output of the pump light source.
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