CN114173225B - Novel passive optical network architecture based on discrete EDFA optical amplifier - Google Patents
Novel passive optical network architecture based on discrete EDFA optical amplifier Download PDFInfo
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Abstract
The application discloses a novel passive optical network architecture based on a discrete EDFA optical amplifier, which relates to the technical field of optical communication and comprises an optical line terminal, a passive optical distribution network and an optical network unit, wherein the optical line terminal comprises a first optical circulator, and an OLT transmitting end and an OLT receiving end which are connected with the first optical circulator; the passive optical distribution network comprises a second optical circulator, a third optical circulator and an optical beam splitter, and two passive parts connected between the second optical circulator and the third optical circulator, wherein the second optical circulator is connected with the first optical circulator, and the third optical circulator is connected with the optical beam splitter; the optical network unit comprises two active parts and a plurality of optical network sub-units, and each optical network sub-unit is connected with an optical beam splitter. The application can embed the EDFA into the optical distribution network without damaging the passive property of the original optical distribution network.
Description
Technical Field
The application relates to the technical field of optical communication, in particular to a novel passive optical network architecture based on a discrete EDFA optical 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, data traffic based on IP (Internet Protocol, protocol for interconnection between networks) has been increasing explosively, and for the basis of information transmission (optical fiber backbone transmission network), the increase of single channel transmission rate from 40Gbit/s to 100Gbit/s or even 1Tbit/s has become a necessary trend.
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 conventional passive optical network (Passive optical network, PON) technology is widely studied as an access technology for current mainstream business, and its main structure is a classical point-to-multipoint transmission architecture, and the whole system architecture does not have any active amplifying device, thereby reducing the system cost. Because the Ethernet PON and the G-bit PON technologies widely adopted at the present stage mainly adopt a time division multiplexing (Time division multiplexing, TDM) mode, and are based on a direct alignment and direct detection technology with a simple structure, the cost and the complexity are lower, but the cost and the complexity 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 forcedly increased, the scheme also faces double physical damage of insufficient dispersion and receiving sensitivity, and 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 passive optical networks limits further increases in system power budget.
Erbium-doped fiber amplifiers (Erbium Doped Fiber Application Amplifier, EDFA) are the most widely used and technology-mature optical amplifiers today. In order to achieve optical amplification in a passive optical network architecture, to maximize the system power budget, the industry has attempted to add erbium-doped fiber amplifiers to the passive optical network architecture. For example, an EDFA is placed at the OLT (optical line terminal ) end, so as to boost the system loading power, thereby obtaining a higher system power budget. However, once the EDFA is placed in the optical distribution network, the passive nature of the optical distribution network is caused, making the original optical distribution network architecture unusable, increasing the complexity and cost of the system.
Therefore, a new passive optical network architecture is needed to realize the embedding of the EDFA into the optical distribution network without damaging the passive nature of the original optical distribution network.
Disclosure of Invention
Aiming at the defects existing in the prior art, the application aims to provide a novel passive optical network architecture based on a discrete EDFA optical amplifier, which can embed the EDFA into an optical distribution network without damaging the passive property of the original optical distribution network.
To achieve the above object, the present application provides a novel passive optical network architecture based on a discrete EDFA optical amplifier, comprising:
the optical line terminal comprises a first optical circulator, an OLT transmitting end and an OLT receiving end, wherein the OLT transmitting end and the OLT receiving end are connected with the first optical circulator;
a passive optical distribution network comprising a second optical circulator, a third optical circulator and an optical splitter, and two passive sections connected between the second optical circulator and the third optical circulator, the second optical circulator being connected to the first optical circulator and the third optical circulator being connected to the optical splitter;
an optical network unit comprising two active portions and a plurality of optical network subunits, each optical network subunit being connected to an optical splitter;
the active part comprises a pump light source and a control circuit, the passive part comprises two isolators and a wavelength coupler arranged between the two isolators, the pump light source of one active part is connected with one passive part, and the pump light source of the other active part is connected with the other passive part.
On the basis of the technical proposal, the method comprises the following steps,
an optical filter is arranged between the first optical circulator and the OLT receiving end;
the input end of the optical filter is connected with the first optical circulator, and the output end of the optical filter is connected with the receiving end of the OLT.
On the basis of the technical proposal, the method comprises the following steps,
the first optical circulator comprises a port 1, a port 2 and a port 3;
the transmission direction of the first optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3;
the OLT transmitting end is connected with a port 1 of the first optical circulator;
the optical filter is connected with the port 3 of the first optical circulator;
the second optical circulator is connected to port 2 of the first optical circulator.
On the basis of the technical scheme, each optical network subunit comprises a fourth optical circulator, an ONU transmitting end and an ONU receiving end which are connected with the fourth optical circulator, and the fourth optical circulator in each optical network subunit is connected with an optical beam splitter.
On the basis of the technical proposal, the method comprises the following steps,
the fourth optical circulator comprises a port 1, a port 2 and a port 3;
the transmission direction of the fourth optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3;
the ONU transmitting end is connected with a port 1 of a fourth optical circulator;
the ONU receiving end is connected with a port 3 of the fourth optical circulator;
the port 2 of the fourth optical circulator is connected to an optical splitter.
On the basis of the technical proposal, the method comprises the following steps,
in each passive part, the input end of the wavelength coupler is connected with an isolator, and the output end of the wavelength coupler is connected with the isolator through an erbium-doped optical fiber;
for two active parts, the pump light source of one active part is connected with the input end of the wavelength coupler of one passive part through the pump transmission medium optical fiber, and the pump light source of the other active part is connected with the input end of the wavelength coupler of the other passive part through the pump transmission medium optical fiber.
On the basis of the technical proposal, the method comprises the following steps,
the second optical circulator comprises a port 1, a port 2 and a port 3;
the transmission direction of the second optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3;
the third optical circulator comprises a port 1, a port 2 and a port 3;
the transmission direction of the third optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3;
the passive portion includes a first passive portion and a second passive portion.
On the basis of the technical proposal, the method comprises the following steps,
the port 2 of the second optical circulator is connected with the first optical circulator;
the port 3 of the second optical circulator is connected with the input end of the first passive part;
the port 1 of the second optical circulator is connected to the output of the second passive section.
On the basis of the technical proposal, the method comprises the following steps,
the port 2 of the third optical circulator is connected with an optical beam splitter;
the port 1 of the third optical circulator is connected with the output end of the first passive part;
the port 3 of the third optical circulator is connected to the input of the second passive section.
On the basis of the technical scheme, the first optical circulator and the second optical circulator are connected through an optical fiber link.
Compared with the prior art, the application has the advantages that: by introducing the discrete EDFA structure into the passive optical network architecture, not only the simultaneous amplification of uplink and downlink optical signals can be realized, but also the optical distribution network architecture in the original passive optical network is not greatly changed, any active device is not added in the optical distribution network, so that the new system architecture can be very easy to update and replace the original architecture, and the application cost is greatly reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a novel passive optical network architecture based on a discrete EDFA optical amplifier according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a novel passive optical network architecture based on a discrete EDFA optical amplifier, which can realize simultaneous amplification of uplink and downlink optical signals by introducing the discrete EDFA structure into the passive optical network architecture, and also ensure that the optical distribution network architecture in the original passive optical network is not greatly changed, any active device is not added in the optical distribution network, thus ensuring that the new system architecture can be very easy to update and replace the original architecture and greatly reducing the application cost.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application.
Referring to fig. 1, the embodiment of the application provides a novel passive optical network architecture based on a discrete EDFA optical amplifier, which comprises an optical line terminal, a passive optical distribution network and an optical network unit.
The optical line terminal comprises a first optical circulator and an OLT transmitting end and an OLT receiving end which are connected with the first optical circulator, namely, the OLT transmitting end and the OLT receiving end in the optical line terminal are connected with the first optical circulator.
The passive optical distribution network comprises a second optical circulator, a third optical circulator and an optical beam splitter, and two passive parts connected between the second optical circulator and the third optical circulator, wherein the second optical circulator is connected with the first optical circulator, and the third optical circulator is connected with the optical beam splitter; for convenience of description, two passive parts in the passive optical distribution network are a first passive part and a second passive part, an input end of the first passive part is connected with the second optical circulator, an output end of the first passive part is connected with the third optical circulator, an input end of the second passive part is also connected with the second optical circulator, and an output end of the second passive part is also connected with the third optical circulator.
The optical network unit comprises two active parts and a plurality of optical network sub-units, and each optical network sub-unit is connected with an optical beam splitter. There are two active portions and two passive portions, one for each active portion. The active part comprises a pump light source and a control circuit, the pump light source is connected with the control circuit, the passive part comprises two isolators and a wavelength coupler arranged between the two isolators, the pump light source of one active part is connected with one passive part, and the pump light source of the other active part is connected with the other passive part.
For the optical line terminal in the application, specifically, an optical filter is arranged between the first optical circulator and the OLT receiving end, the input end of the optical filter is connected with the first optical circulator, and the output end is connected with the OLT receiving end. The first optical circulator comprises a port 1, a port 2 and a port 3; the transmission direction of the first optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3; the OLT transmitting end is connected with a port 1 of the first optical circulator; the optical filter is connected with the port 3 of the first optical circulator; the second optical circulator is connected to port 2 of the first optical circulator.
For the optical network unit in the application, each optical network subunit comprises a fourth optical circulator, an ONU transmitting end and an ONU receiving end which are connected with the fourth optical circulator, and the fourth optical circulator in each optical network subunit is connected with an optical beam splitter. The fourth optical circulator comprises a port 1, a port 2 and a port 3; the transmission direction of the fourth optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3; the ONU transmitting end is connected with a port 1 of the fourth optical circulator; the ONU receiving end is connected with a port 3 of the fourth optical circulator; the port 2 of the fourth optical circulator is connected to an optical splitter.
For the passive optical distribution network in the present application, in each passive part, the input end of the wavelength coupler is connected with an isolator, the output end is connected with an isolator through an erbium-doped fiber, i.e. in the first passive part, the input end of the wavelength coupler is connected with an isolator, the output end is connected with an isolator through an erbium-doped fiber, in the second passive part, the input end of the wavelength coupler is connected with an isolator, and the output end is connected with an isolator through an erbium-doped fiber.
For two active parts, the pump light source of one active part is connected with the input end of the wavelength coupler of one passive part through the pump transmission medium optical fiber, and the pump light source of the other active part is connected with the input end of the wavelength coupler of the other passive part through the pump transmission medium optical fiber. For convenience of description, the two active portions are a first active portion and a second active portion, the pump light source of the first active portion is connected with the input end of the wavelength coupler of the first passive portion through the pump transmission medium optical fiber, and the pump light source of the second active portion is connected with the input end of the wavelength coupler of the second passive portion through the pump transmission medium optical fiber.
The second optical circulator comprises a port 1, a port 2 and a port 3; the transmission direction of the second optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3; the third optical circulator comprises a port 1, a port 2 and a port 3; the transmission direction of the third optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3; the passive portion includes a first passive portion and a second passive portion.
The port 2 of the second optical circulator is connected with the first optical circulator, and is particularly connected with the port 2 of the first optical circulator; the port 3 of the second optical circulator is connected with the input end of the first passive part; the port 1 of the second optical circulator is connected to the output of the second passive section. The port 2 of the third optical circulator is connected with an optical beam splitter; the port 1 of the third optical circulator is connected with the output end of the first passive part; the port 3 of the third optical circulator is connected to the input of the second passive section.
The first optical circulator and the second optical circulator are connected through an optical fiber link. I.e. by means of an optical fiber link, the port 2 of the first optical circulator is connected to the port 2 of the second optical circulator.
The application divides the EDFA into an active part and a passive part, the active part mainly comprises a pumping light source and a control circuit thereof, the passive part comprises a wavelength coupler, an erbium-doped fiber and two isolators, the wavelength coupler is positioned between the two isolators, the output end of the wavelength coupler is connected with one isolator through the erbium-doped fiber, and the other isolator is connected with the input end of the wavelength coupler. The pump light source in the active part is connected with the wavelength coupler of the passive part through a transmission medium optical fiber capable of transmitting pump light.
The optical signal to be amplified is input from the input end of the passive part, firstly passes through an optical isolator, then is input into an optical wavelength coupler, is used for being input into the erbium-doped optical fiber together with pump light transmitted by the transmission medium optical fiber in the active part through the optical wavelength coupler, and is amplified in the erbium-doped optical fiber and then is transmitted to the output end of the passive part through another isolator.
The application provides a novel passive optical network architecture based on a discrete EDFA optical amplifier structure, which comprises an optical line terminal, a passive optical distribution network and a plurality of optical network units. The OLT transmitting end is connected to the port 1 of the first optical circulator, the OLT receiving end is connected to the output of an optical filter, and the input of the optical filter is connected to the port 3 of the first optical circulator, and the port 2 of the first optical circulator is connected to the passive optical distribution network.
In the passive optical distribution network, there is a section of optical fiber link at first, then input the port 2 of the second optical circulator, the port 3 of the second optical circulator connects the input end of a passive part of a discrete EDFA (hereinafter referred to as the first discrete EDFA); the port 2 of the second optical circulator is connected to the output of the passive part of another discrete EDFA (hereinafter referred to as second discrete EDFA). The output of the first discrete EDFA passive section is connected to port 1 of the third optical circulator, the input of the second discrete EDFA is connected to port 3 of the third optical circulator, and port 2 of the third optical circulator is connected to one of the ports 1: n-beam splitter, while 1: the N-beam splitter is in turn connected to a plurality of individual optical network sub-units of the optical network unit. Each optical network subunit has a circulator, an ONU transmitting end and an ONU receiving end. In addition to the N independent optical network subunits, an optical network unit is added, which is not responsible for data transceiving, and includes active portions of the first discrete EDFA and the second discrete EDFA, and pump light thereof is connected to optical wavelength couplers in the passive portions of the first discrete EDFA and the second discrete EDFA in the optical distribution network through two independent transmission medium optical fibers.
Let the center wavelength of the optical signal at the transmitting end of the OLT be lambda OLT The central wavelength of the optical signal of the optical network unit uplink signal transmitting end is lambda ONU The central wavelength of the pumping light source is lambda Pump . According to the working principle of the EDFA amplifier, the center wavelength lambda OLT 、λ ONU Amplification of the optical signal can be achieved as long as it is within the effective gain range of the first discrete EDFA or the second discrete EDFA. The first discrete EDFA is used for amplifying a downlink optical signal output from the optical line terminal; the second discrete EDFA is used for amplifying the uplink optical signals output from the optical network unit end, so that the purpose of amplifying the uplink optical signals and the downlink optical signals simultaneously is achieved. It should be noted that, because the power of the pump light source is generally larger, the transmission medium optical fiber of the pump light source in the system generally needs to be a specially designed optical fiber, which is required to have lower power loss and smaller nonlinear coefficient, including but not limited to a hollow fiber, an ultra-large effective area ultra-low loss optical fiber or a photonic crystal optical fiber.
The novel passive optical network architecture of the present application is specifically described below with reference to an example.
The novel passive optical network architecture comprises an optical line terminal, a passive optical distribution network and 16 optical network subunits. The OLT transmitter is connected to port 1 of the first optical circulator, the OLT receiver is connected to the output of an optical filter, and the input of the optical filter is connected to port 3 of the first optical circulator. The port 2 of the first optical circulator is then connected to a passive optical distribution network.
In a passive optical distribution network, there is first a length of 40 km of g.652d standard single mode fiber link, and then port 2 of the second optical circulator is input. The port 3 of the second optical circulator is connected with the input end of the passive part of the first discrete EDFA; the port 2 of the second optical circulator is then connected to the output of the passive section of the second discrete EDFA. The output of the first discrete EDFA passive section is connected to port 1 of the third optical circulator, the input of the second discrete EDFA is connected to port 3 of the third optical circulator, and port 2 of the third optical circulator is connected to a 1:16 optical splitter, which in turn is connected to 16 independent optical network subunits at the optical network unit side. Each optical network subunit has a circulator, an ONU transmitting end and an ONU receiving end. At the optical network unit side, in addition to 16 independent optical network subunits, a unit not responsible for data transceiving is added, wherein the unit comprises active parts of a first discrete EDFA and a second discrete EDFA, and pump light of the unit is connected to optical wavelength couplers in passive parts of the first discrete EDFA and the second discrete EDFA in a passive optical distribution network through two independent transmission medium fibers (in this example, low-loss hollow fibers).
Let the center wavelength of the optical signal at the transmitting end of the OLT be lambda OLT The central wavelength of the optical signal at the upstream signal transmitting end of the optical network unit is lambda ONU =1560 nm, the central wavelength λ of the raman pump light source Pump =980 nm. According to the working principle of the EDFA amplifier, the center wavelength lambda OLT 、λ ONU Amplification of the optical signal can be achieved as long as it is within the effective gain range of the first discrete EDFA or the second discrete EDFA. The first discrete EDFA is used for amplifying a downlink optical signal output from the optical line terminal; the second discrete EDFA is used for amplifying the uplink optical signals output from the optical network unit end, so that the purpose of amplifying the uplink optical signals and the downlink optical signals simultaneously is achieved. It should be noted that, since the power of the pump light source is generally larger (30 dBm, i.e. 1000mW in this example), the transmission medium fiber of the pump light source in the system is generally a specially designed fiber, which is required to have lower power loss and smaller nonlinear coefficientIncluding but not limited to hollow core fibers, ultra large effective area ultra low loss fibers, or photonic crystal fibers.
It should be noted that, the wavelength and the number of the uplink optical signals, the wavelength and the number of the downlink optical signals and the wavelength and the number of the pumping light sources in the application can be flexibly set according to the actual link condition and the design principle of the EDFA optical amplifier; the optical fiber link is not only limited to a common G.652D standard single mode optical fiber, but also comprises all optical fiber media capable of transmitting optical signals; the pump transmission medium optical fiber is not limited to the low-loss hollow fiber, but also includes all optical fiber media with low power loss and small nonlinear coefficient.
The novel passive optical network architecture based on the discrete EDFA optical amplifier of the embodiment of the application can realize the simultaneous amplification of uplink and downlink optical signals by introducing the discrete EDFA structure into the passive optical network architecture, and also ensures that the optical distribution network architecture in the original passive optical network is not greatly changed, any active device is not added in the optical distribution network, thus ensuring that the new system architecture can be very easy to update and replace the original architecture and greatly reducing the application cost.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A novel passive optical network architecture based on a discrete EDFA optical amplifier, comprising:
the optical line terminal comprises a first optical circulator, an OLT transmitting end and an OLT receiving end, wherein the OLT transmitting end and the OLT receiving end are connected with the first optical circulator;
a passive optical distribution network comprising a second optical circulator, a third optical circulator and an optical splitter, and two passive sections connected between the second optical circulator and the third optical circulator, the second optical circulator being connected to the first optical circulator and the third optical circulator being connected to the optical splitter;
an optical network unit comprising two active portions and a plurality of optical network subunits, each optical network subunit being connected to an optical splitter;
the active part comprises a pump light source and a control circuit, the passive part comprises two isolators and a wavelength coupler arranged between the two isolators, the pump light source of one active part is connected with one passive part, and the pump light source of the other active part is connected with the other passive part;
the optical signal to be amplified is input from the input end of the passive part, firstly passes through an isolator, then is input into the wavelength coupler, is used for being input into the erbium-doped optical fiber together with pump light transmitted by the transmission medium optical fiber in the active part through the wavelength coupler, and is transmitted to the output end of the passive part through another isolator after being amplified in the erbium-doped optical fiber;
wherein, let the center wavelength of the optical signal at the transmitting end of the OLT be lambda OLT The central wavelength of the optical signal of the optical network unit uplink signal transmitting end is lambda ONU The central wavelength of the pumping light source is lambda Pump According to the working principle of the EDFA amplifier, the center wavelength lambda OLT 、λ ONU The amplification of the optical signal can be achieved as long as it is within the effective gain range of the first discrete EDFA for amplifying the downstream optical signal output from the optical line terminal or the second discrete EDFA; the second discrete EDFA is used for amplifying the uplink optical signals output from the optical network unit end, so that the purpose of amplifying the uplink optical signals and the downlink optical signals simultaneously is achieved.
2. A novel passive optical network architecture based on a discrete EDFA optical amplifier as claimed in claim 1, characterized in that:
an optical filter is arranged between the first optical circulator and the OLT receiving end;
the input end of the optical filter is connected with the first optical circulator, and the output end of the optical filter is connected with the receiving end of the OLT.
3. A novel passive optical network architecture based on a discrete EDFA optical amplifier as claimed in claim 2, characterized in that:
the first optical circulator comprises a port 1, a port 2 and a port 3;
the transmission direction of the first optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3;
the OLT transmitting end is connected with a port 1 of the first optical circulator;
the optical filter is connected with the port 3 of the first optical circulator;
the second optical circulator is connected to port 2 of the first optical circulator.
4. A novel passive optical network architecture based on a discrete EDFA optical amplifier as claimed in claim 1, characterized in that: each optical network subunit comprises a fourth optical circulator, an ONU transmitting end and an ONU receiving end which are connected with the fourth optical circulator, and the fourth optical circulator in each optical network subunit is connected with an optical beam splitter.
5. A novel passive optical network architecture based on a discrete EDFA optical amplifier as defined in claim 4, wherein:
the fourth optical circulator comprises a port 1, a port 2 and a port 3;
the transmission direction of the fourth optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3;
the ONU transmitting end is connected with a port 1 of a fourth optical circulator;
the ONU receiving end is connected with a port 3 of the fourth optical circulator;
the port 2 of the fourth optical circulator is connected to an optical splitter.
6. A novel passive optical network architecture based on a discrete EDFA optical amplifier as claimed in claim 1, characterized in that:
in each passive part, the input end of the wavelength coupler is connected with an isolator, and the output end of the wavelength coupler is connected with the isolator through an erbium-doped optical fiber;
for two active parts, the pump light source of one active part is connected with the input end of the wavelength coupler of one passive part through the pump transmission medium optical fiber, and the pump light source of the other active part is connected with the input end of the wavelength coupler of the other passive part through the pump transmission medium optical fiber.
7. A novel passive optical network architecture based on a discrete EDFA optical amplifier as claimed in claim 1, characterized in that:
the second optical circulator comprises a port 1, a port 2 and a port 3;
the transmission direction of the second optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3;
the third optical circulator comprises a port 1, a port 2 and a port 3;
the transmission direction of the third optical circulator is that an optical signal input by the port 1 is output to the port 2, and an optical signal input by the port 2 is output to the port 3;
the passive portion includes a first passive portion and a second passive portion.
8. The novel passive optical network architecture based on a discrete EDFA optical amplifier as defined in claim 7, wherein:
the port 2 of the second optical circulator is connected with the first optical circulator;
the port 3 of the second optical circulator is connected with the input end of the first passive part;
the port 1 of the second optical circulator is connected to the output of the second passive section.
9. The novel passive optical network architecture based on a discrete EDFA optical amplifier as claimed in claim 8, wherein:
the port 2 of the third optical circulator is connected with an optical beam splitter;
the port 1 of the third optical circulator is connected with the output end of the first passive part;
the port 3 of the third optical circulator is connected to the input of the second passive section.
10. A novel passive optical network architecture based on a discrete EDFA optical amplifier as claimed in claim 1, characterized in that: the first optical circulator and the second optical circulator are connected through an optical fiber link.
Priority Applications (1)
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