CN114243437A - 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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- 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
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- 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 based on a centralized Raman fiber amplifier and an optical amplification method, which relate to the technical field of optical communication. The first active module sends first pump light to the first passive module, and the second active module sends second pump light to the second passive 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 the method is suitable for a PON system, and simultaneously amplifies uplink and downlink signals, and improves the system loading power, thereby obtaining higher system power budget.
Description
Technical Field
The present invention relates to the field of Optical communications technologies, and in particular, to a Passive Optical Network (PON) system and an Optical amplification method based on a centralized raman fiber amplifier.
Background
The 21 st century is a highly informative era in that the transmission, processing and storage of information will require unprecedented scale and speed, on the order of magnitude of too bits (1 Tb/s). In recent years, with the increasing degree of social informatization, especially data services based on IP (Internet Protocol) are increasing explosively, and for the basic information transmission, i.e. the optical fiber backbone transmission network, the increase of the single channel transmission rate from 40Gbit/s to 100Gbit/s or even 1Tbit/s has become a necessary trend.
As the transmission capacity of the medium and long distance backbone networks is increased, the access networks are under increased pressure. The traditional passive optical network access technology is limited by factors such as technology, devices and cost, the transmission capacity and performance of the traditional passive optical network access technology cannot meet the increasing demand of users for increasingly accelerated communication bandwidth, and the promotion potential is very limited, so that the traditional passive optical network becomes a bottleneck limiting the bearing capacity of the whole optical communication network.
The traditional passive optical network technology is widely researched as the mainstream commercial access technology at present, the main structure of the traditional passive optical network technology is a classical point-to-multipoint transmission architecture, and no active amplification device is arranged in the whole system architecture, so that the system cost is reduced.
The EPON (Ethernet Passive Optical Network) and GPON (Gigabit-Capable Passive Optical Network) technologies widely adopted at the present stage mainly adopt a TDM (Time division multiplexing) mode, and are based on a direct modulation direct detection technology with a simple structure, so that the cost and the complexity are lower, but are limited by an 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 damages of dispersion and insufficient receiving sensitivity, and the increasing access capacity requirement 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 dispersion damage. However, the disadvantage of lacking optical amplification means in the conventional PON system limits further increase of the system power budget.
In order to achieve optical amplification in PON system architecture and maximize system power budget, the industry has attempted to introduce rare-earth doped fiber amplifiers (typically erbium doped fiber amplifiers) or SOAs (semiconductor optical amplifiers) into PON systems. For example, an EDFA (Erbium Doped Fiber Amplifier) or a semiconductor Optical Amplifier is added to an OLT (Optical line terminal) or each ONU (Optical Network Unit), so as to increase the system loading power and obtain a higher system power budget.
However, the operating wavelength range of the rare-earth doped fiber amplifier completely depends on the physical properties of the rare-earth doped fiber amplifier, so the operating wavelength range is very limited, and the amplifier can cause higher nonlinear effect, and has larger volume and larger power consumption, and basically cannot be used for the ONU.
On the other hand, semiconductor lasers provide a smaller saturation output gain and a larger noise figure, although they can provide a larger operating wavelength range and are smaller in size and power consumption.
The RFA (Raman Fiber Amplifier) has a series of advantages of low noise figure, small nonlinear effect, and capability of providing a large working wavelength range. Raman fiber amplifiers are of two types, namely, centralized and distributed, each having its own characteristics. The centralized raman fiber amplifier is a separate element that separates the raman fiber amplifier from the transmission fiber. The gain optical fiber used in a centralized mode is relatively short, the pumping power is very high, high gain of more than 40dB can be generated, and the gain optical 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 as a gain medium, has a lower noise coefficient, but depends too much on the fiber medium, and cannot be flexibly configured according to different link lengths.
The traditional 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 sequentially connected, 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. Due to the existence of the active part, the conventional centralized raman fiber amplifier cannot be applied to the PON system.
Disclosure of Invention
In view of the defects in the prior art, an object of the present application is to provide a PON system and an optical amplification method based on a centralized raman fiber amplifier.
In order to achieve the above purposes, the technical scheme is as follows:
a first aspect of the present application provides a PON system based on a centralized raman fiber amplifier, including:
the optical network unit comprises an ONU side and a plurality of ONU modules, wherein the ONU modules comprise a first active module and a second active module, the ONU modules are used for sending uplink optical signals to be amplified, and the first passive module and the second passive module are both active parts of a centralized Raman fiber amplifier and are respectively used for sending first pump light and second pump light;
the ODN side comprises a light beam splitter, the light 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 a centralized Raman fiber amplifier; the first passive module amplifies an externally sent downlink optical signal to be amplified by using first pump light to obtain an amplified downlink optical signal, and the optical beam splitter splits the amplified downlink optical signal and sends the split downlink optical signal to the ONU modules; the optical beam splitter is further used for combining the plurality of uplink optical signals to be amplified and then sending the combined optical signals to the second passive module, and the second passive module amplifies the plurality of uplink optical signals to be amplified by using second pump light to obtain amplified uplink optical signals.
In some embodiments, the first passive module and the first active module are connected by a first raman pumped transmission medium fiber and the second passive module and the second active module are connected by a second raman pumped transmission medium fiber.
In some embodiments, the first active module comprises a first control circuit and a first raman pumping light source connected in series for transmitting a first pump light through a first raman pumped transmission medium fiber to the first passive module;
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 comprises:
the OLT transmitting end is used for transmitting a downlink optical signal to be amplified;
an OLT receiving end for receiving the amplified uplink optical signal;
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/output port of the first optical circulator; and the optical line terminal is also used for receiving the amplified uplink optical signal sent by the ODN side through the input/output port of the optical line terminal, and sending the amplified uplink optical signal to the OLT receiving end through the output port of the optical line terminal.
In some embodiments, 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 series;
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 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 the 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 optical fiber link is used for receiving a downlink optical signal to be amplified sent by the optical fiber link through an input/output port of the optical fiber link and sending the downlink optical signal to be amplified to the first passive module through an output port of the optical fiber link; the optical fiber link is also used for receiving the amplified uplink optical signal sent by the second passive module through the input port of the optical fiber link and sending the amplified uplink optical signal to the optical fiber link through the input/output port of the optical fiber link;
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/output port of the third optical circulator is connected with the optical beam splitter; the optical splitter is used for receiving a downlink optical signal to be amplified at a first passive module sending end through an input port of the optical splitter and sending the downlink optical signal to be amplified to the optical splitter through an input/output port of the optical splitter; and the optical splitter is further configured to receive, through an input/output port thereof, the plurality of uplink optical signals to be amplified sent by the optical splitter, and send, through an output port thereof, the plurality of uplink optical signals to be amplified to an input end of the second passive module.
In some embodiments, the ONU module comprises:
an ONU transmitting end for transmitting an upstream optical signal to be amplified;
an ONU receiving end for receiving the amplified downlink optical signal;
the input end of the fourth optical circulator is connected with the ONU sending end, the output end of the fourth optical circulator is connected with the ONU receiving end, and the input end and the output end of the fourth optical circulator are connected with the ODN side; the optical network unit is used for receiving the amplified downlink optical signal sent by the ODN side through the input/output port of the optical network unit and sending the amplified downlink optical signal to the ONU receiving end through the output port of the optical network unit; and the optical network unit is also used for receiving the uplink optical signal to be amplified sent by the ONU sending end through the input port of the optical network unit and sending the uplink optical signal to be amplified to the ODN side through the input/output port of the optical network unit.
In some embodiments, the central wavelength of the downstream optical signal to be amplified is within the raman gain lifetime range of the central wavelength of the first pump light;
the central wavelength of the uplink optical signal to be amplified is within the Raman gain effective period range of the central wavelength of the second pump light.
The 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 at the ODN side, and configuring a first active module and a second active module at the ONU side;
sending first pump light to a first passive module through a first active module, and sending second pump light to a second passive module through a 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 effect that technical scheme that this application provided brought includes:
the centralized Raman fiber amplifier structure is introduced into a passive optical network architecture, so that uplink and downlink optical signals can be simultaneously amplified, the optical distribution network architecture in the original passive optical network system is not greatly changed, any active device is not added in the optical distribution network, the new system architecture can be very easily updated and replaced, the application cost is greatly reduced, the system loading power is improved, and 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 will be described in further detail 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 provided on the ONU side and the ODN side, and amplify a downstream optical signal from the OLT side to the ONU side. A second active module a2 and a second passive module P2 of the second centralized raman fiber amplifier are respectively provided on the ONU side and the ODN side, and amplify 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 simultaneously amplifying uplink and downlink optical signals.
Specifically, an embodiment of the present invention provides a PON system based on a centralized raman fiber amplifier, including 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, 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 both active portions of the centralized raman fiber amplifier and are configured to transmit a first pump light and a second pump light, respectively.
The ODN side includes an optical splitter 1: n, 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 both 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 beam splitter 1: and n is used for splitting the amplified downlink optical signal and then sending the split downlink optical signal to the plurality of ONU modules.
The optical splitter 1: n is further configured to combine the multiple uplink optical signals to be amplified and send the combined optical signals to the second passive module P2, and the second passive module P2 amplifies the multiple uplink optical signals to be amplified by using the second pump light to obtain the amplified uplink optical signals.
In this embodiment, taking the following direction as an example, the working principle of the centralized raman fiber amplifier is explained, where a downstream optical signal to be amplified is input from an input end, passes through the downstream first isolator I1, and then is input into the first raman gain medium fiber GM1, the pump light output by the first active part a1 is input into the first raman gain medium fiber GM1 from the opposite direction through the first wavelength coupler C by the first raman pump transmission medium fiber TM1, and the downstream optical signal to be amplified in the first raman gain medium fiber GM1 is amplified and then is sent to an output end through the downstream second isolator I2.
On the ONU side, in addition to n independent ONU modules, a unit not responsible for data transmission and reception is added, and the unit includes a first active module a1 and a second active module a 2. And 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 fiber TM1 and second raman pump transmission medium fiber TM 2.
The active parts and the passive parts 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 a passive optical network architecture, not only can uplink and downlink optical signals be amplified simultaneously, but also the optical distribution network architecture in the original passive optical network system is not greatly changed, and no active device is added in the optical distribution network, so that the new system architecture can be very easily updated and replaced for the original architecture, the application cost is greatly reduced, the system loading power is improved, and 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 series. The first raman pump light source LS1 is configured to transmit first pump light to the first passive module P1 through the first raman pump transmission medium fiber TM 1.
The second active module a2 includes a second control circuit CC2 and a second raman pump light source LS2 which are sequentially connected. The second raman pump light source LS2 is configured to transmit second pump light to the second passive module P2 through the second raman pump transmission medium fiber TM 2.
The first passive module P1 and the first active module a1 are connected by a first raman pump transmission medium fiber TM1, and the second passive module P2 and the second active module a2 are connected by a second raman pump transmission medium fiber TM 2. The lengths of the first Raman pump transmission medium fiber TM1 and the second Raman pump transmission medium fiber TM2 can be adjusted according to the transmission distance, and the long-distance transmission requirement is met.
In this embodiment, since the powers of the first raman pump light source LS1 and the second raman pump light source LS2 are generally large, the first raman pump transmission medium fiber TM1 and the second raman pump transmission medium fiber TM2 in the system generally use specially designed fibers, and require low power loss and small nonlinear coefficient, including but not limited to hollow fibers, ultra-large effective area ultra-low loss fibers, or photonic crystal fibers.
The first Raman gain medium optical fiber GM1 and the second Raman gain medium optical fiber GM2 are optical fiber media with higher stimulated Raman effect (common G.652D optical fibers are adopted), and the length is generally below 3 kilometers.
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 sending end TXolt is used for sending downlink optical signals to be amplified, and the OLT receiving end RXolt is used for receiving the amplified uplink optical signals. The first optical circulator O1 receives the to-be-amplified downlink optical signal sent by the OLT sending end TXolt through its input port 1, and sends the to-be-amplified downlink optical signal to the ODN side through its input/output port 2. The first optical circulator O1 also receives the amplified uplink optical signal sent by the ODN side through its input/output port 2, and sends the amplified uplink optical signal to the OLT receiving end RXolt through its output port 3.
In this embodiment, all the transmission directions of the optical circulators are from the input port 1 to the input/output port 2, and from the input/output port 2 to the output port 3.
In the 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 series.
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 connected in series.
The ODN side comprises an optical fiber link L, one end of the optical fiber link L is connected with the OLT side, the other end of the optical fiber link L is connected with an input/output port 2 of a first optical circulator O2, a first optical circulator O2 is connected with the input end of a first passive module P1 and the output end of a second passive module P2, the output end of the first passive module P1 and the input end of the second passive module P2 are connected with an optical beam splitter 1: n is the same as the formula (I).
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 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 upstream first isolator I2. The first optical circulator O2 is configured to receive the downlink optical signal to be amplified sent by the optical fiber link L through its input/output port 2, and send the downlink optical signal to be amplified to the first passive module P1 through its output port 3. The first optical circulator O2 is further configured to receive the amplified uplink optical signal sent by the second passive module P2 through its input port 1, and send the amplified uplink optical signal to the optical fiber link L through its input/output port 2.
An input port 1 of the third optical circulator O3 is connected to an output port 3 of the first passive module P1, that is, the downstream second isolator I2, an output port 3 thereof is connected to an input port 1 of the second passive module P2, that is, the upstream second isolator I4, and an input/output port 2 thereof is connected to the optical splitter 1: n is the same as the formula (I). The third optical circulator O3 is configured to receive the downlink optical signal to be amplified sent by the first passive module P1 through its input port 1, and send the downlink optical signal to be amplified to the optical splitter 1 through its input/output port 2: n is the same as the formula (I). The third optical circulator O3 is also used to receive the optical splitter 1 through its input-output port 2: n and sends the plurality of upstream optical signals to be amplified to the input end of the second passive module P2 through the output port 3.
In a preferred embodiment, the ONU module comprises an ONU transmitting end TXonu, an ONU receiving end RXonu, and a fourth optical circulator O4, wherein the fourth optical circulator O4 connects the ONU transmitting end TXonu and the ONU receiving end RXonu.
And the transmitting end TXonu of the ONU is used for transmitting an uplink optical signal to be amplified. And the ONU receives the RXonu for receiving the amplified downlink optical signal. The input end of the fourth optical circulator O4 is connected to the ONU transmitting end TXonu, the output end thereof is connected to the ONU receiving RXonu, and the input and output ends thereof are connected to the ODN side. The fourth optical circulator O4 is configured to receive the amplified downlink optical signal sent by the ODN side through its input/output port 2, and send the amplified downlink optical signal to the ONU through its output port 3 to receive rxonus. The fourth optical circulator O4 is further configured to receive the uplink optical signal to be amplified sent by the ONU sending end TXonu through its input port 1, and send the uplink optical signal to be amplified to the ODN side through its input/output port 2.
In a preferred embodiment, the central wavelength of the downstream optical signal to be amplified is within the raman gain lifetime of the central wavelength of the first pump light.
The central wavelength of the uplink optical signal to be amplified is within the effective period range of the Raman gain of the central wavelength of the second pump light.
In this embodiment, let the central wavelength of the optical signal to be amplified at the OLT side be λOLTThe central wavelength of the uplink optical signal to be amplified at the sending end of the ONU module at the ONU side is lambdaONUCentral wavelength of Raman pump light source
And
λOLTmust be in
In the effective region of Raman gain, in general, λ is a value for ensuring the gain of Raman light amplificationOLTShould be compared with
The length is 80nm to 120 nm. Lambda [ alpha ]ONUMust be in
In the effective region of Raman gain, in general, λ is a value for ensuring the gain of Raman light amplificationONUShould be compared with
The length is 80nm to 120 nm.
In the preferred embodiment, an optical filter OF is disposed between the optical circulator and the OLT transmitter OLT and OLT receiver OLT at the OLT side for filtering the optical signal.
Referring to fig. 2, an embodiment of the present invention provides an optical amplification method based on a centralized raman fiber amplifier, including:
step S1, the first passive module P1 and the second passive module P2 are disposed on the ODN side, and the first active module a1 and the second active module a2 are disposed on the ONU side.
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 with 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 with 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 at the ODN side and the ONU side, so that the centralized raman fiber amplifier structure is introduced into the passive optical network architecture, and not only can the uplink and downlink optical signals be simultaneously amplified, but also the optical distribution network architecture in the original passive optical network system is not greatly changed, and no active device is added in the optical distribution network, so that the new system architecture can very easily update and replace the original architecture, thereby greatly reducing the application cost, improving the system loading power, and obtaining a higher system power budget. The present application is not limited to the above embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present application, and such modifications and improvements 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 optical network unit comprises an ONU side and a plurality of ONU modules, wherein the ONU modules comprise a first active module and a second active module, the ONU modules are used for sending uplink optical signals to be amplified, and the first passive module and the second passive module are both active parts of a centralized Raman fiber amplifier and are respectively used for sending first pump light and second pump light;
the ODN side comprises a light beam splitter, the light 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 a centralized Raman fiber amplifier; the first passive module amplifies an externally sent downlink optical signal to be amplified by using first pump light to obtain an amplified downlink optical signal, and the optical beam splitter splits the amplified downlink optical signal and sends the split downlink optical signal to the ONU modules; the optical beam splitter is further used for combining the plurality of uplink optical signals to be amplified and then sending the combined optical signals to the second passive module, and the second passive module amplifies the plurality of uplink optical signals to be amplified by using second pump light to obtain amplified uplink optical signals.
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 fiber, and the second passive module and the second active module are connected by a second raman pump transmission medium 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 connected in series, the first raman pump light source being configured to transmit the first pump light to the first passive module through a first raman pump transmission medium 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, characterized in that 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 a downlink optical signal to be amplified;
an OLT receiving end for receiving the amplified uplink optical signal;
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/output port of the first optical circulator; and the optical line terminal is also used for receiving the amplified uplink optical signal sent by the ODN side through the input/output port of the optical line terminal, and sending the amplified uplink optical signal to the OLT receiving end through the output port of the optical line terminal.
6. The centralized raman fiber amplifier-based PON system 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 series;
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 the centralized Raman fiber amplifier of 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 the 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 optical fiber link is used for receiving a downlink optical signal to be amplified sent by the optical fiber link through an input/output port of the optical fiber link and sending the downlink optical signal to be amplified to the first passive module through an output port of the optical fiber link; the optical fiber link is also used for receiving the amplified uplink optical signal sent by the second passive module through the input port of the optical fiber link and sending the amplified uplink optical signal to the optical fiber link through the input/output port of the optical fiber link;
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/output port of the third optical circulator is connected with the optical beam splitter; the optical splitter is used for receiving a downlink optical signal to be amplified at a first passive module sending end through an input port of the optical splitter and sending the downlink optical signal to be amplified to the optical splitter through an input/output port of the optical splitter; and the optical splitter is further configured to receive, through an input/output port thereof, the plurality of uplink optical signals to be amplified sent by the optical splitter, and send, through an output port thereof, the plurality of uplink optical signals to be amplified to an input end of the second passive module.
8. The centralized raman fiber amplifier based PON system of claim 1, wherein the ONU module comprises:
an ONU transmitting end for transmitting an upstream optical signal to be amplified;
an ONU receiving end for receiving the amplified downlink optical signal;
the input end of the fourth optical circulator is connected with the ONU sending end, the output end of the fourth optical circulator is connected with the ONU receiving end, and the input end and the output end of the fourth optical circulator are connected with the ODN side; the optical network unit is used for receiving the amplified downlink optical signal sent by the ODN side through the input/output port of the optical network unit and sending the amplified downlink optical signal to the ONU receiving end through the output port of the optical network unit; and the optical network unit is also used for receiving the uplink optical signal to be amplified sent by the ONU sending end through the input port of the optical network unit and sending the uplink optical signal to be amplified to the ODN side through the input/output port of the optical network unit.
9. The PON system based on a centralized raman optical fiber amplifier according to claim 1, wherein the central wavelength of the downstream optical signal to be amplified is within the raman gain valid period of the central wavelength of the first pump light;
the central wavelength of the uplink optical signal to be amplified is within the Raman gain effective period range of the central wavelength of the second pump light.
10. An optical amplification method based on a centralized Raman fiber amplifier, comprising:
configuring a first passive module and a second passive module at the ODN side, and configuring a first active module and a second active module at the ONU side;
sending first pump light to a first passive module through a first active module, and sending second pump light to a second passive module through a 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 (8)
| 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 |
| US20170272197A1 (en) * | 2016-03-17 | 2017-09-21 | Telekom Malaysia Berhad | Extender For Optical Access Communication Network |
| 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 |
-
2021
- 2021-12-08 CN CN202111491130.6A patent/CN114243437B/en active Active
Patent Citations (8)
| 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 |
| US20170272197A1 (en) * | 2016-03-17 | 2017-09-21 | Telekom Malaysia Berhad | Extender For Optical Access Communication Network |
| 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 |
|---|
| KAVAN ACHARYA: "Cross-talk penalty compensation and reach extension in wavelength division multiplexed passive optical network using remote raman pump", 《OPTICAL ENGINEERING》, vol. 49, no. 8, pages 3 * |
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