CN114243437B - PON system based on centralized Raman fiber amplifier and optical amplification method - Google Patents
PON system based on centralized Raman fiber amplifier and optical amplification method Download PDFInfo
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 104
- 239000000835 fiber Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000003321 amplification Effects 0.000 title abstract description 11
- 238000003199 nucleic acid amplification method Methods 0.000 title abstract description 11
- 239000013307 optical fiber Substances 0.000 claims description 48
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- 238000011144 upstream manufacturing Methods 0.000 description 12
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- 239000004065 semiconductor Substances 0.000 description 4
- 229910052691 Erbium Inorganic materials 0.000 description 3
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
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- 239000002360 explosive Substances 0.000 description 1
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- 239000004038 photonic crystal Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
- H01S3/094046—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser of a Raman fibre laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
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Abstract
The application discloses a PON system and an optical amplification method based on a centralized Raman fiber amplifier, and relates to the technical field of optical communication. And sending the first pump light to the first passive module through the first active module, and sending the second pump light to the second passive module through the second active module. The first active module amplifies the downlink optical signal to be amplified by using the first pump light to obtain an amplified downlink optical signal, and the second active module amplifies the uplink optical signal to be amplified by using the second pump light to obtain an amplified uplink optical signal. According to the method, the active part and the passive part of the two centralized Raman fiber amplifiers are respectively arranged on the ODN side and the ONU side, so that uplink and downlink signals are amplified while the method is applicable to a PON system, the loading power of the system is improved, and further, higher system power budget is obtained.
Description
Technical Field
The present disclosure relates to the field of optical communications technologies, and in particular, to a PON (Passive Optical Network ) system and an optical amplification method based on a centralized raman fiber amplifier.
Background
The 21 st century is a highly informative era and the transmission, processing and storage of information will require unprecedented scales and speeds, on the order of ethernet bits (1 Tb/s). In recent years, with the continuous improvement of the degree of social informatization, especially the explosive growth of data services based on IP (Internet Protocol ), the increase of single channel transmission rate from 40Gbit/s to 100Gbit/s or even 1Tbit/s has become a necessary trend for the optical fiber backbone transmission network which is the basis of information transmission.
As the transmission capacity of medium and long distance backbones becomes larger, access networks are also under greater pressure. The conventional passive optical network access technology is limited by factors such as technology, devices, cost and the like, the transmission capacity and performance of the conventional passive optical network access technology cannot meet the increasing requirement of users on the increasing speed of communication bandwidth, and the lifting potential is very limited, so that the conventional passive optical network has become a bottleneck for limiting the bearing capacity of the whole optical communication network.
The traditional passive optical network technology is widely studied as an access technology of current mainstream business, the main structure of the traditional passive optical network technology is a classical point-to-multipoint transmission architecture, and the whole system architecture does not have any active amplifying device, so that the system cost is reduced.
EPON (Ethernet Passive Optical Network ) and GPON (Gigabit passive optical network) technologies widely adopted at the present stage mainly adopt a TDM (Time division multiplexing ) mode, are based on a direct alignment and direct detection technology with simple structure, and have lower cost and complexity, but are limited by OOK modulation format and device performance, the access rate of the scheme is generally lower, and if the modulation rate is forcibly increased, the scheme faces double physical damage of insufficient dispersion and receiving sensitivity, so that the requirement of increasingly growing access capacity in the future is difficult to meet.
The introduction of the coherent detection technology greatly improves the sensitivity of the receiver at the same speed, and more thoroughly solves the problem of chromatic dispersion damage. However, the lack of optical amplification means in conventional PON systems limits further increases in system power budget.
In order to achieve optical amplification in PON system architectures, to maximize the system power budget, the industry has attempted to introduce rare-earth doped fiber amplifiers (typically such as erbium doped fiber amplifiers) or SOAs (semiconductor optical amplifier, semiconductor optical amplifiers) into PON systems. For example, an EDFA (Erbium Doped Fiber Application Amplifier, erbium doped fiber amplifier) or a semiconductor optical amplifier is added to the OLT (optical line terminal ) or each ONU (Optical Network Unit, optical network unit), so as to increase the system loading power, thereby obtaining a higher system power budget.
However, the operating wavelength range of the rare earth doped fiber amplifier is completely dependent on the physical properties of the doped rare earth element, so that the operating wavelength range is very limited, and a high nonlinear effect is caused, and the optical fiber amplifier has large volume and large power consumption and cannot be basically used for the ONU.
On the other hand, a semiconductor laser, while providing a larger operating wavelength range and smaller volume and power consumption, provides a smaller saturated output gain and a larger noise figure.
RFA (Raman Fiber Amplifier ) has a series of advantages of low noise figure, less nonlinear effect, and can provide a large operating wavelength range. Raman fiber amplifiers are of two types, i.e. centralized and distributed, each with its characteristics. The centralized raman fiber amplifier is a separate element from the transmission fiber. The centralized gain fiber is relatively short, the pumping power is high, the high gain of more than 40dB can be generated, and the centralized gain fiber is particularly flexible and independent of the link length, and is more suitable for being applied to an access network system with a short distance. The distributed raman fiber amplifier uses the transmission fiber itself as a gain medium, has a lower noise coefficient, but is too dependent on the fiber medium to be flexibly configured according to different link lengths.
The conventional centralized raman fiber amplifier is divided into an active part and a passive part. The active part mainly comprises a Raman pump light source and a control circuit thereof. The passive part comprises a first isolator, a wavelength coupler and a second isolator which are connected in sequence, wherein the first isolator is connected with the wavelength coupler through a Raman gain medium optical fiber. The passive part and the active part are connected through a transmission medium optical fiber. Because of the active part, the conventional centralized raman fiber amplifier cannot be applied to PON systems.
Disclosure of Invention
Aiming at the defects in the prior art, the object of the application is to provide a PON system based on a centralized Raman fiber amplifier and an optical amplification method.
In order to achieve the above purpose, the technical scheme adopted is as follows:
a first aspect of the present application provides a PON system based on a centralized raman fiber amplifier, comprising:
the ONU side comprises a plurality of ONU modules, a first active module and a second active module, wherein the ONU modules are used for sending uplink optical signals to be amplified, and the first passive module and the second passive module are active parts of the centralized Raman fiber amplifier and are respectively used for sending first pump light and second pump light;
the ODN side comprises an optical beam splitter, wherein the optical beam splitter is respectively connected with a first passive module and a second passive module, and the first passive module and the second passive module are passive parts of the centralized Raman fiber amplifier; the first passive module amplifies the downlink optical signal to be amplified, which is sent from the outside, by using the first pump light to obtain an amplified downlink optical signal, and the optical splitter splits the amplified downlink optical signal and sends the amplified downlink optical signal to the ONU modules; the optical beam splitter is further configured to combine the plurality of uplink optical signals to be amplified and send the combined optical signals to the second passive module, where the second passive module amplifies the plurality of uplink optical signals to be amplified by using the second pump light to obtain an amplified uplink optical signal.
In some embodiments, the first passive module and the first active module are connected by a first raman pump transmission medium optical fiber, and the second passive module and the second active module are connected by a second raman pump transmission medium optical fiber.
In some embodiments, the first active module includes a first control circuit and a first raman pump light source connected in sequence, the first raman pump light source configured to send a first pump light to the first passive module through a first raman pump transmission medium optical fiber;
the second active module comprises a second control circuit and a second Raman pump light source which are sequentially connected, and the second Raman pump light source is used for sending second pump light to the second passive module through a second Raman pump transmission medium optical fiber.
In some embodiments, the system further comprises:
and the OLT side is used for sending the downlink optical signal to be amplified to the ONU side and receiving the amplified uplink optical signal sent by the ONU side.
In some embodiments, the OLT side includes:
the OLT transmitting end is used for transmitting the downlink optical signal to be amplified;
the OLT receiving end is used for receiving the amplified uplink optical signals;
the first optical circulator is used for receiving the downlink optical signal to be amplified sent by the OLT sending end through an input port of the first optical circulator and sending the downlink optical signal to be amplified to the ODN side through an input and output port of the first optical circulator; the optical line terminal is also used for receiving the amplified uplink optical signal sent by the ODN side through the input and output ports of the optical line terminal, and sending the amplified uplink optical signal to the OLT receiving end through the output ports of the optical line terminal.
In some embodiments, the first passive module includes a downstream first isolator, a first raman gain medium fiber, a first wavelength coupler, and a downstream second isolator connected in sequence;
the second passive module comprises an uplink first isolator, a second Raman gain medium optical fiber, a second wavelength coupler and an uplink second isolator which are sequentially connected.
In some embodiments, the ODN side includes:
one end of the optical fiber link is connected with the OLT side, and the other end of the optical fiber link is connected with an input/output port of the second optical circulator;
the output port of the second optical circulator is connected with the input end of the first passive module, and the input port of the second optical circulator is connected with the output end of the second passive module; the system comprises a first passive module, a second passive module, a first optical module, a second passive module and a third passive module, wherein the first passive module is used for receiving a downlink optical signal to be amplified sent by an optical fiber link through an input/output port of the first passive module, and sending the downlink optical signal to be amplified to the first passive module through an output port of the first passive module; the optical fiber link is also used for receiving the amplified uplink optical signal sent by the second passive module through the input port and sending the amplified uplink optical signal to the optical fiber link through the input and output port;
the input port of the third optical circulator is connected with the output end of the first passive module, the output port of the third optical circulator is connected with the input end of the second passive module, and the input and output ports of the third optical circulator are connected with the optical beam splitter; the optical splitter is used for receiving the downlink optical signal to be amplified at the transmitting end of the first passive module through the input port and transmitting the downlink optical signal to be amplified to the optical splitter through the input and output port; and the optical splitter is also used for receiving the plurality of uplink optical signals to be amplified sent by the optical splitter through the input and output ports thereof and sending the plurality of uplink optical signals to be amplified to the input end of the second passive module through the output ports thereof.
In some embodiments, the ONU module comprises:
the ONU transmitting end is used for transmitting the uplink optical signal to be amplified;
the ONU receiving end is used for receiving the amplified downlink optical signals;
the input end of the fourth optical circulator is connected with the ONU transmitting end, the output end of the fourth optical circulator is connected with the ONU receiving end, and the input and output ends of the fourth optical circulator are connected with the ODN side; the optical network unit is used for receiving the amplified downlink optical signals sent by the ODN side through the input and output ports of the optical network unit and sending the amplified downlink optical signals to the ONU receiving end through the output ports of the optical network unit; and the optical fiber is also used for receiving the uplink optical signal to be amplified, which is sent by the ONU sending end, through the input port and sending the uplink optical signal to be amplified to the ODN side through the input and output port.
In some embodiments, a center wavelength of the downlink optical signal to be amplified is located within a raman gain validity range of a center wavelength of the first pump light;
the center wavelength of the uplink optical signal to be amplified is located in the Raman gain effective period range of the center wavelength of the second pump light.
A second aspect of the present application provides an amplification method based on a centralized raman fiber amplifier, including:
configuring a first passive module and a second passive module on an ODN side, and configuring the first active module and the second active module on an ONU side;
transmitting first pump light to the first passive module through the first active module, and transmitting second pump light to the second passive module through the second active module;
the first active module amplifies the downlink optical signal to be amplified by using the first pump light to obtain an amplified downlink optical signal, and the second active module amplifies the uplink optical signal to be amplified by using the second pump light to obtain an amplified uplink optical signal.
The beneficial effects that technical scheme that this application provided brought include:
the centralized Raman fiber amplifier structure is introduced into the passive optical network architecture, so that uplink and downlink optical signals can be amplified simultaneously, the optical distribution network architecture in the original passive optical network system is not changed greatly, any active device is not added in the optical distribution network, the new system architecture can be updated and replaced easily, the application cost is reduced greatly, the loading power of the system is improved, and therefore, the higher system power budget is obtained.
Drawings
Fig. 1 is a schematic diagram of a PON system based on a centralized raman fiber amplifier according to an embodiment of the present invention.
Fig. 2 is a flowchart of an optical amplification method based on a centralized raman fiber amplifier according to an embodiment of the present invention.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, the present invention provides a PON system based on a centralized raman fiber amplifier, which employs a first centralized raman fiber amplifier and a second centralized raman fiber amplifier. The first active module A1 and the first passive module P1 of the first centralized raman fiber amplifier are respectively disposed on the ONU side and the ODN side, and are used for amplifying the downstream optical signal from the OLT side to the ONU side. The second active module A2 and the second passive module P2 of the second centralized raman fiber amplifier are respectively disposed on the ONU side and the ODN side, and are used for amplifying an upstream optical signal from the ONU side to the OLT side. The first centralized Raman fiber amplifier and the second centralized Raman fiber amplifier are utilized to achieve the purpose of amplifying uplink and downlink optical signals simultaneously.
Specifically, an embodiment of the present invention provides a PON system based on a centralized raman fiber amplifier, which includes an OLT side, an ODN side, and an ONU side that are sequentially connected.
The OLT side is used for sending the downlink optical signal to be amplified to the ONU side and receiving the amplified uplink optical signal sent by the ONU side.
The ONU side includes a plurality of independent ONU modules, namely ONU (1), ONU (2) … … ONU (n), a first active module A1, and a second active module A2, where the ONU modules are configured to transmit an upstream optical signal to be amplified, and the first passive module P1 and the second passive module P2 are active portions of the centralized raman optical fiber amplifier and are configured to transmit a first pump light and a second pump light, respectively.
The ODN side includes an optical beam splitter 1: n, optical beam splitter 1: n are respectively connected with the first passive module P1 and the second passive module P2, and the first passive module P1 and the second passive module P2 are passive parts of the centralized raman fiber amplifier.
The first passive module P1 amplifies the downlink optical signal to be amplified by using the first pump light to obtain an amplified downlink optical signal, and the optical splitter 1: and n is used for splitting the amplified downlink optical signals and transmitting the split downlink optical signals to a plurality of ONU modules.
The beam splitter 1: and n is also used for combining the plurality of uplink optical signals to be amplified and then sending the combined uplink optical signals to the second passive module P2, and the second passive module P2 amplifies the plurality of uplink optical signals to be amplified by using the second pump light to obtain amplified uplink optical signals.
In this embodiment, taking the downlink direction as an example, the working principle of the centralized raman fiber amplifier is explained, the downlink optical signal to be amplified is input from the input end, firstly passes through the downlink first isolator I1, then is input into the first raman gain medium fiber GM1, the pump light output by the first active portion A1 is input into the first raman gain medium fiber GM1 from the opposite direction through the first raman pump transmission medium fiber TM1 through the first wavelength coupler C, and the downlink optical signal to be amplified in the first raman gain medium fiber GM1 is amplified and then is sent to the output end through the downlink second isolator I2.
On the ONU side, besides n independent ONU modules, a unit not responsible for data transmission and reception is added, where the unit includes a first active module A1 and a second active module A2. The first pump light and the second pump light are connected to the first passive module P1 and the second passive module P2 through two independent first raman pump transmission medium optical fibers TM1 and second raman pump transmission medium optical fibers TM 2.
The active part and the passive part of the two centralized Raman fiber amplifiers are respectively arranged on the ODN side and the ONU side, so that the centralized Raman fiber amplifier structure is introduced into the passive optical network architecture, uplink and downlink optical signals can be amplified simultaneously, the optical distribution network architecture in the original passive optical network system is not changed greatly, any active device is not added in the optical distribution network, the new system architecture is ensured to be capable of updating and replacing the original architecture very easily, the application cost is greatly reduced, the loading power of the system is improved, and the higher system power budget is obtained.
In a preferred embodiment, the first active module A1 includes a first control circuit CC1 and a first raman pump light source LS1 connected in sequence. The first raman pump light source LS1 is configured to send first pump light to the first passive module P1 through the first raman pump transmission medium optical fiber TM 1.
The second active module A2 includes a second control circuit CC2 and a second raman pump light source LS2 connected in sequence. The second raman pump light source LS2 is configured to send the second pump light to the second passive module P2 through the second raman pump transmission medium optical fiber TM 2.
The first passive module P1 and the first active module A1 are connected by a first raman pump transmission medium optical fiber TM1, and the second passive module P2 and the second active module A2 are connected by a second raman pump transmission medium optical fiber TM 2. The lengths of the first Raman pump transmission medium optical fiber TM1 and the second Raman pump transmission medium optical fiber TM2 can be adjusted according to the transmission distance, so that the long-distance transmission requirement is met.
In this embodiment, since the power of the first raman pump light source LS1 and the second raman pump light source LS2 is generally larger, the first raman pump transmission medium optical fiber TM1 and the second raman pump transmission medium optical fiber TM2 in the system generally need to be specially designed optical fibers, which are required to have lower power loss and smaller nonlinear coefficient, including but not limited to hollow optical fibers, ultra-large effective area ultra-low loss optical fibers or photonic crystal fibers.
The first raman gain medium optical fiber GM1 and the second raman gain medium optical fiber GM2 generally adopt optical fiber media with higher stimulated raman effect (generally adopt ordinary g.652d optical fibers), and the length is generally below 3 km.
In a preferred embodiment, the OLT side includes an OLT transmitting end TXolt, an OLT receiving end RXolt, and a first optical circulator O1. The OLT transmitting end Txolt is used for transmitting the downlink optical signal to be amplified, and the OLT receiving end Rxolt is used for receiving the amplified uplink optical signal. The first optical circulator O1 receives, through an input port 1 thereof, a downlink optical signal to be amplified sent by the OLT transmitting end TXolt, and sends, through an input/output port 2 thereof, the downlink optical signal to be amplified to the ODN side. The first optical circulator O1 further receives the amplified upstream optical signal sent by the ODN side through the input/output port 2 thereof, and sends the amplified upstream optical signal to the OLT receiving end RXolt through the output port 3 thereof.
In this embodiment, all optical circulators are transmitted in the direction from input port 1 to input/output port 2 and from input/output port 2 to output port 3.
In a preferred embodiment, the first passive module P1 includes a downstream first isolator I1, a first raman gain medium fiber GM1, a first wavelength coupler C1, and a downstream second isolator I2 connected in sequence.
The second passive module P2 includes an upstream first isolator I3, a second raman gain medium fiber GM2, a second wavelength coupler C2, and an upstream second isolator I4, which are sequentially connected.
The ODN side includes an optical fiber link L, one end of the optical fiber link L is connected to the OLT side, the other end is connected to the input/output port 2 of the first optical circulator O2, the first optical circulator O2 is connected to the input end of the first passive module P1 and the output end of the second passive module P2, and the output end of the first passive module P1 and the input end of the second passive module P2 are connected to the optical splitter 1: n.
The output port 3 of the first optical circulator O2 is connected to the input port 1 of the first passive module P1, i.e. the input port 1 of the downstream first isolator I1, and the input port 1 thereof is connected to the output port 3 of the second passive module P2, i.e. the output port 3 of the upstream first isolator I2. The first optical circulator O2 is configured to receive, through an input/output port 2 thereof, a downlink optical signal to be amplified sent by the optical fiber link L, and send, through an output port 3 thereof, the downlink optical signal to be amplified to the first passive module P1. The first optical circulator O2 is further configured to receive, through the input port 1 thereof, the amplified upstream optical signal sent by the second passive module P2, and send, through the input/output port 2 thereof, the amplified upstream optical signal to the optical fiber link L.
The input port 1 of the third optical circulator O3 is connected to the output port 3 of the first passive module P1, i.e. the output port 3 of the downstream second isolator I2, the output port 3 thereof is connected to the input port 1 of the second passive module P2, i.e. the input port 1 of the upstream second isolator I4, and the input/output port 2 thereof is connected to the optical splitter 1: n. The third optical circulator O3 is configured to receive, through the input port 1 thereof, the downstream optical signal to be amplified sent by the first passive module P1, and send, through the input/output port 2 thereof, the downstream optical signal to be amplified to the optical splitter 1: n. The third optical circulator O3 is further configured to receive the optical splitter 1 through its input/output port 2: n, and the output port 3 of the n sends the plurality of uplink optical signals to be amplified to the input end of the second passive module P2.
In a preferred embodiment, the ONU module includes an ONU transmitting end TXonu, an ONU receiving RXonu, and a fourth optical circulator O4, where the fourth optical circulator O4 connects the ONU transmitting end TXonu and the ONU receiving RXonu.
The ONU transmitting end TXonu is configured to transmit an uplink optical signal to be amplified. The ONU receives RXonu and is used for receiving the amplified downlink optical signals. The input end of the fourth optical circulator O4 is connected with the ONU transmitting end TXonu, the output end of the fourth optical circulator O4 is connected with the ONU receiving RXonu, and the input and output end of the fourth optical circulator O4 is connected with the ODN side. The fourth optical circulator O4 is configured to receive the amplified downstream optical signal sent by the ODN side through the input/output port 2 thereof, and send the amplified downstream optical signal to the ONU receiving RXonu through the output port 3 thereof. The fourth optical circulator O4 is further configured to receive, through an input port 1 thereof, an upstream optical signal to be amplified sent by the ONU transmitting end TXonu, and send, through an input/output port 2 thereof, the upstream optical signal to be amplified to the ODN side.
In a preferred embodiment, the center wavelength of the downstream optical signal to be amplified is within the raman gain lifetime of the center wavelength of the first pump light.
The center wavelength of the uplink optical signal to be amplified is located in the raman gain valid period range of the center wavelength of the second pump light.
In this embodiment, let the center wavelength of the optical signal to be amplified at the OLT side be λ OLT The central wavelength of the uplink optical signal to be amplified at the transmitting end of the ONU module at the ONU side is lambda ONU Center wavelength of Raman pump light sourceAnd->λ OLT Must be at->In general, lambda is used to ensure the gain of Raman optical amplification within the effective Raman gain region OLT Should be proportional-> 80nm to 120nm long. Lambda (lambda) ONU Must be at->In general, lambda is used to ensure the gain of Raman optical amplification within the effective Raman gain region ONU Should be proportional->80nm to 120nm long.
In a preferred embodiment, an optical filter OF is provided between the optical circulator and the OLT transmitting end OLT and the OLT receiving end OLT on the OLT side for optical signal filtering.
Referring to fig. 2, an embodiment of the present invention provides an optical amplifying method based on a centralized raman fiber amplifier, including:
in step S1, a first passive module P1 and a second passive module P2 are configured on the ODN side, and a first active module A1 and a second active module A2 are configured on the ONU side.
In step S2, the first active module A1 sends the first pump light to the first passive module P1, and the second active module A2 sends the second pump light to the second passive module P2.
Step S3, the first active module A1 amplifies the downlink optical signal to be amplified by using the first pump light to obtain an amplified downlink optical signal, and the second active module A2 amplifies the uplink optical signal to be amplified by using the second pump light to obtain an amplified uplink optical signal.
In this embodiment, the active portions and the passive portions of the two centralized raman fiber amplifiers are respectively disposed on the ODN side and the ONU side, so that the centralized raman fiber amplifier structure is introduced into the passive optical network architecture, which not only can amplify uplink and downlink optical signals simultaneously, but also can prevent the optical distribution network architecture in the original passive optical network system from being greatly changed, and any active device is not added in the optical distribution network, thereby ensuring that the new system architecture can update and replace the original architecture very easily, greatly reducing the application cost, improving the loading power of the system, and further obtaining higher system power budget. The present application is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that modifications and variations can be made without departing from the principles of the present application, and such modifications and variations are also considered to be within the scope of the present application.
Claims (10)
1. A PON system based on a centralized raman fiber amplifier, comprising:
the ONU side comprises a plurality of ONU modules, a first active module and a second active module, wherein the ONU modules are used for sending uplink optical signals to be amplified, and the first passive module and the second passive module are active parts of the centralized Raman fiber amplifier and are respectively used for sending first pump light and second pump light;
the ODN side comprises an optical beam splitter, wherein the optical beam splitter is respectively connected with a first passive module and a second passive module, and the first passive module and the second passive module are passive parts of the centralized Raman fiber amplifier; the first passive module amplifies the downlink optical signal to be amplified, which is sent from the outside, by using the first pump light to obtain an amplified downlink optical signal, and the optical splitter splits the amplified downlink optical signal and sends the amplified downlink optical signal to the ONU modules; the optical beam splitter is further configured to combine the plurality of uplink optical signals to be amplified and send the combined optical signals to the second passive module, where the second passive module amplifies the plurality of uplink optical signals to be amplified by using the second pump light to obtain an amplified uplink optical signal.
2. The PON system based on a centralized raman fiber amplifier according to claim 1, wherein the first passive module and the first active module are connected by a first raman pump transmission medium optical fiber, and the second passive module and the second active module are connected by a second raman pump transmission medium optical fiber.
3. The PON system based on a centralized raman fiber amplifier according to claim 2, wherein the first active module comprises a first control circuit and a first raman pump light source sequentially connected, the first raman pump light source being configured to send a first pump light to the first passive module through a first raman pump transmission medium optical fiber;
the second active module comprises a second control circuit and a second Raman pump light source which are sequentially connected, and the second Raman pump light source is used for sending second pump light to the second passive module through a second Raman pump transmission medium optical fiber.
4. A PON system based on a centralized raman fiber amplifier according to claim 1, wherein the system further comprises:
and the OLT side is used for sending the downlink optical signal to be amplified to the ONU side and receiving the amplified uplink optical signal sent by the ONU side.
5. A PON system based on a centralized raman fiber amplifier according to claim 3, wherein the OLT side comprises:
the OLT transmitting end is used for transmitting the downlink optical signal to be amplified;
the OLT receiving end is used for receiving the amplified uplink optical signals;
the first optical circulator is used for receiving the downlink optical signal to be amplified sent by the OLT sending end through an input port of the first optical circulator and sending the downlink optical signal to be amplified to the ODN side through an input and output port of the first optical circulator; the optical line terminal is also used for receiving the amplified uplink optical signal sent by the ODN side through the input and output ports of the optical line terminal, and sending the amplified uplink optical signal to the OLT receiving end through the output ports of the optical line terminal.
6. The PON system based on a centralized raman fiber amplifier according to claim 1, wherein the first passive module comprises a downstream first isolator, a first raman gain medium fiber, a first wavelength coupler, and a downstream second isolator connected in sequence;
the second passive module comprises an uplink first isolator, a second Raman gain medium optical fiber, a second wavelength coupler and an uplink second isolator which are sequentially connected.
7. The PON system based on a centralized raman fiber amplifier according to claim 6, wherein the ODN side comprises:
one end of the optical fiber link is connected with the OLT side, and the other end of the optical fiber link is connected with an input/output port of the second optical circulator;
the output port of the second optical circulator is connected with the input end of the first passive module, and the input port of the second optical circulator is connected with the output end of the second passive module; the system comprises a first passive module, a second passive module, a first optical module, a second passive module and a third passive module, wherein the first passive module is used for receiving a downlink optical signal to be amplified sent by an optical fiber link through an input/output port of the first passive module, and sending the downlink optical signal to be amplified to the first passive module through an output port of the first passive module; the optical fiber link is also used for receiving the amplified uplink optical signal sent by the second passive module through the input port and sending the amplified uplink optical signal to the optical fiber link through the input and output port;
the input port of the third optical circulator is connected with the output end of the first passive module, the output port of the third optical circulator is connected with the input end of the second passive module, and the input and output ports of the third optical circulator are connected with the optical beam splitter; the optical splitter is used for receiving the downlink optical signal to be amplified at the transmitting end of the first passive module through the input port and transmitting the downlink optical signal to be amplified to the optical splitter through the input and output port; and the optical splitter is also used for receiving the plurality of uplink optical signals to be amplified sent by the optical splitter through the input and output ports thereof and sending the plurality of uplink optical signals to be amplified to the input end of the second passive module through the output ports thereof.
8. The PON system based on a centralized raman fiber amplifier according to claim 1, wherein the ONU module comprises:
the ONU transmitting end is used for transmitting the uplink optical signal to be amplified;
the ONU receiving end is used for receiving the amplified downlink optical signals;
the input end of the fourth optical circulator is connected with the ONU transmitting end, the output end of the fourth optical circulator is connected with the ONU receiving end, and the input and output ends of the fourth optical circulator are connected with the ODN side; the optical network unit is used for receiving the amplified downlink optical signals sent by the ODN side through the input and output ports of the optical network unit and sending the amplified downlink optical signals to the ONU receiving end through the output ports of the optical network unit; and the optical fiber is also used for receiving the uplink optical signal to be amplified, which is sent by the ONU sending end, through the input port and sending the uplink optical signal to be amplified to the ODN side through the input and output port.
9. The PON system based on a centralized raman fiber amplifier according to claim 1, wherein a center wavelength of the downstream optical signal to be amplified is located within a raman gain validity range of a center wavelength of the first pump light;
the center wavelength of the uplink optical signal to be amplified is located in the Raman gain effective period range of the center wavelength of the second pump light.
10. An optical amplifying method based on a centralized raman fiber amplifier, comprising the steps of:
configuring a first passive module and a second passive module on an ODN side, and configuring the first active module and the second active module on an ONU side;
transmitting first pump light to the first passive module through the first active module, and transmitting second pump light to the second passive module through the second active module;
the first active module amplifies the downlink optical signal to be amplified by using the first pump light to obtain an amplified downlink optical signal, and the second active module amplifies the uplink optical signal to be amplified by using the second pump light to obtain an amplified uplink optical signal.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0614991D0 (en) * | 2006-07-28 | 2006-09-06 | Schlumberger Holdings | Improvements to raman amplification in distributed sensors |
| CN101364842A (en) * | 2007-08-09 | 2009-02-11 | 华为技术有限公司 | Apparatus and system prolonging transmission distance of passive optical network |
| CN101621350A (en) * | 2009-08-17 | 2010-01-06 | 华中科技大学 | Wavelength division multiplex passive optical network |
| CN102439998A (en) * | 2011-10-25 | 2012-05-02 | 华为技术有限公司 | Passive optical network system and downlink transmission method thereof |
| CN102783056A (en) * | 2009-12-11 | 2012-11-14 | 阿尔卡特朗讯 | Bidirectional optical amplifier |
| CN210897967U (en) * | 2019-12-24 | 2020-06-30 | 无锡瀚诺光电科技有限公司 | Second-order Raman amplifier of equidirectional pumping |
| CN111698033A (en) * | 2020-05-21 | 2020-09-22 | 武汉光迅科技股份有限公司 | Hybrid optical fiber amplifier, optical signal amplification method, and optical communication system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170272197A1 (en) * | 2016-03-17 | 2017-09-21 | Telekom Malaysia Berhad | Extender For Optical Access Communication Network |
-
2021
- 2021-12-08 CN CN202111491130.6A patent/CN114243437B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0614991D0 (en) * | 2006-07-28 | 2006-09-06 | Schlumberger Holdings | Improvements to raman amplification in distributed sensors |
| CN101364842A (en) * | 2007-08-09 | 2009-02-11 | 华为技术有限公司 | Apparatus and system prolonging transmission distance of passive optical network |
| CN101621350A (en) * | 2009-08-17 | 2010-01-06 | 华中科技大学 | Wavelength division multiplex passive optical network |
| CN102783056A (en) * | 2009-12-11 | 2012-11-14 | 阿尔卡特朗讯 | Bidirectional optical amplifier |
| CN102439998A (en) * | 2011-10-25 | 2012-05-02 | 华为技术有限公司 | Passive optical network system and downlink transmission method thereof |
| CN210897967U (en) * | 2019-12-24 | 2020-06-30 | 无锡瀚诺光电科技有限公司 | Second-order Raman amplifier of equidirectional pumping |
| CN111698033A (en) * | 2020-05-21 | 2020-09-22 | 武汉光迅科技股份有限公司 | Hybrid optical fiber amplifier, optical signal amplification method, and optical communication system |
Non-Patent Citations (1)
| Title |
|---|
| Cross-talk penalty compensation and reach extension in wavelength division multiplexed passive optical network using remote raman pump;Kavan Acharya;《Optical Engineering》;第49卷(第8期);第3部分远程拉曼放大PON系统及分析 * |
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