CN112887851B - Household all-optical network system and implementation method thereof - Google Patents

Household all-optical network system and implementation method thereof Download PDF

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CN112887851B
CN112887851B CN202110040875.4A CN202110040875A CN112887851B CN 112887851 B CN112887851 B CN 112887851B CN 202110040875 A CN202110040875 A CN 202110040875A CN 112887851 B CN112887851 B CN 112887851B
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onu
optical
pon
olt
optical interface
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CN112887851A (en
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刘新峰
强亮
王志军
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Fiberhome Telecommunication Technologies Co Ltd
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Fiberhome Telecommunication Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/18—Network planning tools
    • H04W16/20—Network planning tools for indoor coverage or short range network deployment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0084—Quality of service aspects

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Small-Scale Networks (AREA)

Abstract

The invention discloses a family all optical network system and a realization method thereof, wherein the family all optical network system comprises a local side OLT, an FTTR optical gateway and a plurality of edge ONUs; the FTTR optical gateway includes: the optical network unit comprises a first ONU standard optical interface, an OLT short-distance optical interface, a PON ONU MAC and a processing unit; the PON ONU MAC is connected with the processing unit, the processing unit is respectively connected with the first ONU standard optical interface and the OLT short-distance optical interface, the first ONU standard optical interface is connected with the local side OLT, and the OLT short-distance optical interface is connected with each edge ONU. In the invention, the home wiring is of a PON structure, is relatively flexible and easy to expand, can realize one-to-many data transmission in a home network, does not need to carry out PON-to-ETH conversion for signal interaction between the edge ONU and the local side OLT, reduces time delay and jitter, and improves signal quality.

Description

Household all-optical network system and implementation method thereof
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a home all-optical network system and an implementation method thereof.
Background
The communications industry is continuously accelerating the upgrade of optical fiber bandwidth, and currently, most access networks realize optical fiber access. The development of the optical fiber broadband in China keeps the global leading position, and according to related data released by a national internet information office, the number of national internet broadband access ports reaches 9.16 hundred million by 12 months in 2019, wherein the percentage of the optical fiber access ports is 91.3 percent, which is far higher than the global average level. Meanwhile, innovative service applications are also endless, and ultrahigh-definition videos, cloud VR (Virtual Reality), cloud games, online education, tele-office and the like put forward higher and higher requirements on bandwidth, time delay, jitter and the like of a network, which also drives the demand of users on the broadband to be continuously improved. The continuously improved bandwidth brings better internet experience, but research finds that the capacity of a lot of high-bandwidth packages cannot be fully exerted. The continuously improved PON (Passive Optical Network) access technology enables the home access rate to reach giga and develop to a higher rate, while the access rate of WIFI6 also reaches or even exceeds giga. However, The high-frequency spectrum of WIFI6 causes The wall-through capability to be weaker and weaker, and meanwhile, The traditional family five-class wire networking has The defects that copper wires are easy to age, poor in expansion capability, easy to interfere and The like, and The problems can be well solved by adopting a family all-optical network from optical fibers to rooms, which is also called FTTR (Fiber to The Room/Request).
At present, two main implementation modes exist in a deployment scheme of a home all-optical network:
in a first mode, as shown in fig. 1, an FTTR Optical gateway is disposed in a living room, and a home Optical fiber Network is constructed with the FTTR Optical gateway as a core, in this scheme, the FTTR Optical gateway is used as an ONU (Optical Network Unit ) that is connected to an OLT (Optical Line Terminal) of an office Terminal room on one hand, and on the other hand, a micro OLT is built inside the FTTR Optical gateway and is connected to a plurality of edge ONUs downward through an Optical splitter, wherein the edge ONUs support a gigabit ethernet port and a dual-frequency Wi-Fi, and enter each room along with an Optical fiber to provide wired and wireless gigabit coverage for each room. In the present solution, a home ODN (Optical Distribution Network) is a PON structure, which is flexible, but in an FTTR Optical gateway, a PON ONU MAC needs to convert PON data received from an ONU standard Optical interface into ethernet data, and a PON OLT MAC needs to convert the received ethernet data into PON data again and send the PON data to the home ODN through an OLT Optical interface.
In a second mode, as shown in fig. 2, in this scheme, on one hand, the FTTR optical gateway is still used as an OLT connected to the central office of the ONU, and on the other hand, the FTTR can perform photoelectric conversion by using an original ONU internal ethernet port or a newly added switching chip; edge ONUs use the standard ETH (Ethernet) MAC. In the scheme, in the FTTR optical gateway, the PON ONU MAC needs to convert PON data received from the ONU standard optical interface into ethernet data, and the switching chip sends the received ethernet data to the edge ONU, only one PON conversion needs to be performed, and the switching chip has a small delay jitter and a large capacity of multiple optical fibers, but the home wiring has a P2P structure, which is poor in flexibility and troublesome in capacity expansion.
In a home all-optical network, how to reduce delay and jitter is a technical problem to be solved urgently at present on the premise of ensuring flexibility.
Disclosure of Invention
The invention provides a home all-optical network system and an implementation method thereof, aiming at solving the technical problems that the flexibility, the time delay performance and the jitter performance cannot be compatible by adopting a PON structure to carry out home wiring, being flexible and easy to expand, being capable of realizing one-to-many data transmission in a home network, and reducing the time delay and the jitter and improving the signal quality for the signal interaction between an edge ONU and a local side OLT without the conversion between the PON and the ETH.
To achieve the above object, according to one aspect of the present invention, there is provided a home all-optical network system, including a local OLT, an FTTR optical gateway, and a plurality of edge ONUs;
the FTTR optical gateway includes: the optical network unit comprises a first ONU standard optical interface, an OLT short-distance optical interface, a PON ONU MAC and a processing unit; the PON ONU MAC is connected to the processing unit, the processing unit is connected to the first ONU standard optical interface and the OLT short-range optical interface, the first ONU standard optical interface is connected to the local side OLT, and the OLT short-range optical interface is connected to each edge ONU;
the PON ONU MAC is used for receiving a downlink PON signal of the local side OLT, extracting burst control information from the downlink PON signal, determining a local burst sending time slice according to the burst control information, and sending the burst control information to the processing unit;
the processing unit is used for determining the burst sending time slice of each edge ONU according to the burst control information, and is also used for calculating the starting time and the ending time of the uplink sending of each edge ONU by taking the local burst sending time slice as a reference and the relative difference value of the burst sending time slice of the edge ONU and the local burst sending time slice;
the processing unit is configured to intermittently start a burst transmission function of the first ONU standard optical interface and a burst reception function of the OLT short-range optical interface according to start time and end time of upstream transmission of each edge ONU, so as to transmit an upstream signal of each edge ONU to the local-end OLT.
Preferably, the PON ONU MAC and the processing unit are integrated on one chip to form a dedicated chip, and the dedicated chip is provided with an internet interface, where the internet interface includes a WiFi interface and an ethernet interface, and the device is hung down through the internet interface.
Preferably, the FTTR optical gateway further includes: the optical splitter is connected with the OLT short-range optical interface, the optical splitter is connected with the edge ONU, the optical splitter is also connected with the ONU short-range optical interface, and the ONU short-range optical interface is connected with the PON ONU MAC;
the first ONU standard optical interface is used for receiving a downlink PON signal of a local side OLT, performing photoelectric conversion on the downlink PON signal and then sending the downlink PON signal to the OLT short-range optical interface;
the optical splitter is used for splitting a downlink PON signal sent by the OLT short-range optical interface into two parts, wherein one part is sent to the edge ONU, and the other part is sent to the ONU short-range optical interface;
the ONU short-range optical interface is configured to send the downlink PON signal to the PON ONU MAC.
Preferably, the FTTR optical gateway further includes: the optical splitter is connected with the local side OLT, the optical splitter is connected with the first ONU standard optical interface, the optical splitter is also connected with the second ONU standard optical interface, and the second ONU standard optical interface is connected with the PON ONU MAC;
the optical splitter is configured to split a downstream PON signal of the local side OLT into two parts, where one part is sent to the first ONU standard optical interface, and the other part is sent to the second ONU standard optical interface;
the first ONU standard optical interface is configured to send the downstream PON signal to the OLT short-range optical interface after performing photoelectric conversion on the downstream PON signal, where the OLT short-range optical interface is configured to send the downstream PON signal to the edge ONU;
and the second ONU standard optical interface is used for performing photoelectric conversion on the downlink PON signal and then sending the downlink PON signal to the PON ONU MAC.
Preferably, the optical splitter is a non-uniform optical splitter.
Preferably, the home all-optical network system further includes a standard ODN and a home ODN, the local OLT is connected to the FTTR optical gateway through the standard ODN, and the FTTR optical gateway is connected to each of the edge ONUs through the home ODN.
Preferably, the first ONU standard optical interface and the OLT short-range optical interface are implemented by chips corresponding to a PMD layer, the PON ONU MAC corresponds to a TC layer and an AMCC bottom layer of a PON, the standard ODN corresponds to a PON standard dielectric layer, and the home ODN corresponds to a PON short-range dielectric layer.
Preferably, the downlink PON signal comprises a high-speed service data stream and management control information, and when the downlink PON signal is management control information, the management control information is sent from an auxiliary management control channel OLT-AMCC of a local side OLT, and sent to a PON standard medium layer through a transmission convergence layer PON OLT-TC at a passive optical network fiber line end and a local side physical medium related layer PMDA1 of a PON;
the management control information from the local side OLT to the FTTR optical gateway reaches ONU-AMCC1 through the PMDA2 or PMDB1 via ONU-TC 2;
the management control information flow from the local OLT to the edge ONU passes through the PMDA2, the PMDB1 and the PON short-distance medium layer and then reaches the ONU-AMCC2 through the PMDB2 and the ONU-TC 3.
Preferably, when the downlink PON signal is a high-speed service data stream;
high-speed service data flow enters from an Ethernet physical medium related layer ETH PMD1 of a local side OLT, is converted by an Ethernet medium access control layer ETH MAC1 and a transmission convergence layer PON OLT-TC of a passive optical network fiber line end, and is sent to a PON standard medium layer by a PON local side physical medium related layer PMDA 1;
the high-speed data service flow from the local side OLT to the edge ONU is received by a far-end standard ONU physical medium related layer PMDA2 of the PON on the FTTR optical gateway, and then is directly transferred to a short-distance local side physical medium related layer PMDB1 of the PON to be sent to a PON short-distance medium layer; the high-speed data service flow is firstly received by a PMDB2 related to a physical medium of a far-end short-distance ONU of a PON on an edge ONU, then is converted into an Ethernet flow through an ONU-TC3, an ETH-MAC3 and an ETH-PMD3, and is directly sent to a user side for use or is converted into WIFI for use;
the high-speed data service flow from the local side OLT to the FTTR optical gateway can be from a PMDA2 layer to an ONU-TC2 layer or from a PMDB1 layer to an ONU-TC2 layer, and the data service flow of the ONU-TC2 layer is converted into an Ethernet flow after passing through ETH-MAC2 and ETH-PMD2 and is directly sent to a user side for use or is converted into WIFI for use by the user side.
Preferably, when the local OLT detects that the edge ONU is disconnected, the local OLT is configured to notify the FTTR optical gateway that the burst transmission function of the first ONU standard optical interface and the burst reception function of the OLT short-range optical interface do not need to be started within the start time and the end time of the upstream transmission of the edge ONU.
Preferably, the high-speed data electrical signals between the first ONU standard optical interface and the OLT short-range optical interface are interconnected, and the low-speed PON control signals of the first ONU standard optical interface and the OLT short-range optical interface are interconnected with the processing unit, so that the separation of the high-speed data signals and the low-speed PON control signals is realized on the circuit side.
According to another aspect of the present invention, a method for implementing a home all-optical network system is provided, where the home all-optical network system includes a local OLT, an FTTR optical gateway, and a plurality of edge ONUs;
the FTTR optical gateway includes: the optical network unit comprises a first ONU standard optical interface, an OLT short-distance optical interface, a PON ONU MAC and a processing unit; the PON ONU MAC is connected to the processing unit, the processing unit is connected to the first ONU standard optical interface and the OLT short-range optical interface, the first ONU standard optical interface is connected to the local side OLT, and the OLT short-range optical interface is connected to each edge ONU;
the implementation method comprises the following steps:
the PON ONU MAC receives a downlink PON signal of the local side OLT, extracts burst control information from the downlink PON signal, determines a local burst sending time slice according to the burst control information, and sends the burst control information to the processing unit;
the processing unit determines the burst transmission time slice of each edge ONU according to the burst control information, and is also used for calculating the start time and the end time of uplink transmission of each edge ONU by taking the local burst transmission time slice as a reference and the relative difference between the burst transmission time slice of the edge ONU and the local burst transmission time slice;
the processing unit also intermittently starts a burst sending function of the first ONU standard optical interface and a burst receiving function of the OLT short-distance optical interface according to the starting time and the ending time of the uplink sending of each edge ONU, so that the uplink signal of each edge ONU is sent to the local side OLT.
Preferably, the PON ONU MAC and the processing unit are integrated on one chip to form a dedicated chip, and the dedicated chip is provided with an internet interface, where the internet interface includes a WiFi interface and an ethernet interface, and the device is hung down through the internet interface.
Preferably, the FTTR optical gateway further includes: the optical splitter is connected with the OLT short-range optical interface, the optical splitter is connected with the edge ONU, the optical splitter is also connected with the ONU short-range optical interface, and the ONU short-range optical interface is connected with the PON ONU MAC;
the implementation method further comprises the following steps:
the first ONU standard optical interface receives a downlink PON signal of a local side OLT, and sends the downlink PON signal to the OLT short-range optical interface after performing photoelectric conversion on the downlink PON signal;
the optical splitter divides a downlink PON signal sent by the OLT short-range optical interface into two parts, one part is sent to the edge ONU, and the other part is sent to the ONU short-range optical interface;
and the ONU short-distance optical interface sends the downlink PON signal to the PON ONU MAC.
Preferably, the FTTR optical gateway further includes: the optical splitter is connected with the local side OLT, the optical splitter is connected with the first ONU standard optical interface, the optical splitter is also connected with the second ONU standard optical interface, and the second ONU standard optical interface is connected with the PON ONU MAC;
the implementation method comprises the following steps:
the optical splitter divides a downlink PON signal of the local side OLT into two parts, wherein one part is sent to the first ONU standard optical interface, and the other part is sent to the second ONU standard optical interface;
after the first ONU standard optical interface performs photoelectric conversion on the downlink PON signal, the first ONU standard optical interface sends the downlink PON signal to the OLT short-range optical interface, and the OLT short-range optical interface is used for sending the downlink PON signal to the edge ONU;
and the second ONU standard optical interface performs photoelectric conversion on the downlink PON signal and then sends the downlink PON signal to the PON ONU MAC.
Preferably, the optical splitter is a non-uniform optical splitter.
Preferably, the implementation method further comprises:
when the local side OLT detects that the edge ONU is disconnected, the FTTR optical gateway is informed of the starting time and the ending time of the upstream transmission of the edge ONU without starting the burst transmission function of the first ONU standard optical interface and the burst receiving function of the OLT short-distance optical interface.
Generally, compared with the prior art, the technical scheme of the invention has the following beneficial effects: the invention provides a family all optical network system and a realization method thereof, wherein the family all optical network system comprises a local side OLT, an FTTR optical gateway and a plurality of edge ONUs; the FTTR optical gateway includes: the optical network unit comprises a first ONU standard optical interface, an OLT short-distance optical interface, a PON ONU MAC and a processing unit; the PON ONU MAC is connected with the processing unit, the processing unit is respectively connected with the first ONU standard optical interface and the OLT short-distance optical interface, the first ONU standard optical interface is connected with the local side OLT, and the OLT short-distance optical interface is connected with each edge ONU; the PON ONU MAC is used for receiving a downlink PON signal of the local side OLT, extracting burst control information from the downlink PON signal, determining a local burst sending time slice according to the burst control information, and sending the burst control information to the processing unit; the processing unit is used for determining the burst transmission time slice of each edge ONU according to the burst control information, and is also used for calculating the start time and the end time of uplink transmission of each edge ONU by taking the local burst transmission time slice as a reference and using the relative difference value of the burst transmission time slice of the edge ONU and the local burst transmission time slice; the processing unit is used for intermittently starting the burst sending function of the first ONU standard optical interface and the burst receiving function of the OLT short-distance optical interface according to the starting time and the ending time of the uplink sending of each edge ONU, so that the uplink signal of each edge ONU is sent to the local side OLT.
In the invention, the home wiring is of a PON structure, is relatively flexible and easy to expand, can realize one-to-many data transmission in a home network, does not need to carry out PON-to-ETH conversion for signal interaction between the edge ONU and the local side OLT, reduces time delay and jitter, and improves signal quality.
Drawings
Fig. 1 is a schematic structural diagram of a home all-optical network system in the prior art;
fig. 2 is a schematic structural diagram of another home all-optical network system in the prior art;
fig. 3 is a schematic structural diagram of a home all-optical network system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first home all-optical network system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second home all-optical network system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a third home all-optical network system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a fourth home all-optical network system according to an embodiment of the present invention;
fig. 8 is a schematic data structure diagram of a GTC frame according to an embodiment of the present invention;
fig. 9 is a schematic protocol hierarchy diagram of the local side OLT, the FTTR optical gateway, and the edge ONU in fig. 6 according to an embodiment of the present invention;
fig. 10 is a flowchart illustrating an implementation method of a home all-optical network system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1:
in this embodiment, as shown in fig. 3, the network structure of the present invention is that home cabling in the system is a PON structure, which is relatively flexible and easy to expand, and can implement one-to-many data transmission in a home network, and for signal interaction between an edge ONU and a local OLT, conversion between PON and ETH is not required, so that delay and jitter are reduced, and signal quality is improved.
Referring to fig. 4, the home all-optical network system includes a local OLT, an FTTR optical gateway, and a plurality of edge ONUs. The FTTR optical gateway includes: the optical network unit comprises a first ONU standard optical interface, an OLT short-distance optical interface, a PON ONU MAC and a processing unit; the PON ONU MAC is connected to the processing unit, the processing unit is connected to the first ONU standard optical interface and the OLT short-range optical interface, the first ONU standard optical interface is connected to the local side OLT, and the OLT short-range optical interface is connected to each edge ONU.
The office OLT is generally located in an office machine room of an operator, and includes an OLT standard optical interface, a PON OLT MAC, and an OLT uplink port, where a downlink signal between the office OLT and the edge ONU transmits data in a broadcast transmission manner, and an uplink signal between the office OLT and the edge ONU transmits data in a TDMA (Time Division Multiple Access) manner.
In this embodiment, the high-speed data electrical signals between the first ONU standard optical interface and the OLT short-range optical interface are interconnected, and the low-speed PON control signals of the first ONU standard optical interface and the OLT short-range optical interface are interconnected with the processing unit, so that the separation of the high-speed data signals from the low-speed PON control signals is realized on the circuit side, and the transparent transmission of the high-speed data signals is realized.
The low-speed PON control signal is generated based on the start time and the end time of the upstream transmission of each edge ONU, and is used to turn on the burst transmission function of the first ONU standard optical interface and the burst reception function of the OLT short-range optical interface, and the start time and the end time of the upstream transmission of each edge ONU are obtained in the following manner.
Compared with the scheme shown in fig. 1, the FTTR optical gateway of this embodiment does not have a PON OLT MAC, which reduces complexity and cost of the FTTR optical gateway, and the edge ONUs interact with the central office OLT under control of the central office PON OLT MAC.
In order to achieve the foregoing effect, in the present embodiment, the implementation mechanism of each unit is as follows:
the PON ONU MAC is configured to receive a downstream PON signal of the local OLT, extract burst control information from the downstream PON signal, determine a local burst transmission time slice according to the burst control information, and transmit the burst control information to the processing unit.
Specifically, the PON ONU MAC obtains a GTC (GPON Transmission Convergence layer) frame from the downstream PON signal, and then extracts a bandwidth allocation map (i.e., BWmap in fig. 8) from the GTC frame, and obtains burst control information from the bandwidth allocation map, where the burst control information includes a burst Transmission time slice for each edge ONU to transmit upstream, the burst Transmission time slice includes a Start time (Start) and an End time (End), and each edge ONU needs to transmit an upstream signal to the office OLT on its corresponding time slice.
The processing unit is used for determining the burst transmission time slice of each edge ONU according to the burst control information, and is also used for calculating the start time and the end time of uplink transmission of each edge ONU by taking the local burst transmission time slice as a reference and using the relative difference value of the burst transmission time slice of the edge ONU and the local burst transmission time slice.
Further, the home all-optical network system further includes a standard ODN and a home ODN, the local OLT is connected to the FTTR optical gateway through the standard ODN, and the FTTR optical gateway is connected to each of the edge ONUs through the home ODN. The standard ODN comprises a trunk optical fiber, a PON optical splitter, branch optical fibers and optical nodes, the trunk optical fiber is generally long in distance, the typical distance is several kilometers to more than ten kilometers, the PON optical splitter realizes optical power distribution from the trunk optical fiber to the branch optical fibers, and the edge ONU is accessed to the FTTR optical gateway through the home PON optical splitter.
The common household ONU can be directly hung down in the standard ODN network, and the FTTR optical gateway and the common household ONU are both in the standard ODN network.
In this embodiment, the FTTR optical gateway fully utilizes the built-in PON ONU MAC to perform low-speed PON control signal processing, and precisely controls the burst transmission time of the first ONU standard optical interface by the foregoing method, thereby avoiding frame head and tail collision of a common home ONU transmission frame in the same standard ODN network and ensuring the integrity of edge ONU data transmission.
In an actual application scenario, as shown in fig. 5, the PON ONU MAC and the processing unit may be integrated on one chip to form a dedicated chip, and an internet interface is set on the dedicated chip, where the internet interface includes a WiFi interface and an ethernet interface, and the FTTR optical gateway may implement an internet function by hanging down a device through the internet interface.
Specifically, since the FTTR optical gateway is actually used as an OLT connected to the central office machine room on the ONU, it is first required to acquire burst control information from a downstream PON signal, on the one hand, the PON ONU MAC determines a local burst transmission time slice according to the burst control information, and starts the ONU short-range optical interface according to the local burst transmission time slice, thereby implementing uplink signal transmission between the FTTR optical gateway and the central office OLT. And on the other hand, the processing unit determines the burst transmission time slice of each edge ONU according to the burst control information and is also used for calculating the start time and the end time of the upstream transmission of each edge ONU by taking the local burst transmission time slice as a reference and the relative difference between the burst transmission time slice of the edge ONU and the local burst transmission time slice.
The processing unit is configured to intermittently start a burst transmission function of the first ONU standard optical interface and a burst reception function of the OLT short-range optical interface according to start time and end time of upstream transmission of each edge ONU, so as to transmit an upstream signal of each edge ONU to the local-end OLT.
For example, referring to fig. 8, assuming that the Alloc-ID of the internal ONU of the FTTR optical gateway is Alloc-ID1, the local burst transmission time slice is 200Byte to 400Byte, and the Alloc-ID of one edge ONU1 is Alloc-ID2, the corresponding burst transmission time slice is 500Byte to 650Byte, the PON ONU MAC of the FTTR optical gateway determines the start time t1 and the end time t2 of the upstream transmission of the FTTR optical gateway according to the local burst transmission time slice (200 to 400) and the data transmission rate, where the start time t1 is 200/data transmission rate and the end time t2 is 400/data transmission rate, and then the ONU short-range optical interface is opened according to the start time t1 and the end time t2, so as to implement the upstream signal transmission between the FTTR optical gateway and the office OLT.
Then, with the Start time of the local burst transmission time slice as a reference, a relative difference D between the Start time Start1(500) of the burst transmission time slice of the edge ONU1 and the Start time Start2(200) of the local burst transmission time slice is calculated (where D is 500 and 200 are 300), the Start time t3 of the upstream transmission of the edge ONU1 is t1+ D/data transmission rate, and the end time t4 is t1+ (D + 150)/data transmission rate, so as to determine the Start time and the end time of the upstream transmission of the edge ONU1, and the burst transmission function of the first ONU standard optical interface and the burst reception function of the short-range optical interface are turned on the time slice, so as to transmit the upstream signal of the edge ONU1 to the office OLT.
In addition, because there is a certain distance between the FTTR optical gateway and each edge ONU, the data of the edge ONU needs to reach the FTTR optical gateway after a period of time, and when the data of the edge ONU reaches the FTTR optical gateway, the burst transmission function of the first ONU standard optical interface and the burst reception function of the OLT short-distance optical interface need to be turned on, and therefore, a delay caused by the distance between the FTTR optical gateway and each edge ONU needs to be eliminated. In a preferred embodiment, the start time and the end time of upstream transmission of the edge ONU need to be corrected according to the distance between the FTTR optical gateway and each edge ONU. Specifically, the FTTR optical gateway performs difference calculation according to the ranging value from each edge ONU to the office OLT and the ranging value from the FTTR optical gateway to the office OLT to obtain the distance between the FTTR optical gateway and each edge ONU, obtains the correction time t 'through the data transmission rate, performs delay correction on the start time and the end time of uplink transmission of the corresponding edge ONU by the correction time t', and starts the burst transmission function of the first ONU standard optical interface and the burst reception function of the OLT short-range optical interface by the corrected start time and the corrected end time.
In an actual application scenario, the FTTR optical gateway may include an internal ONU, and the internal ONU may hang down the device, and the FTTR optical gateway itself may implement an internet access function. The internal ONU comprises a PON ONU MAC and an optical interface, and the PON ONU MAC of the internal ONU is communicated with the local OLT through the corresponding optical interface. Specifically, the FTTR optical gateway includes an optical splitter, which is configured to split a downstream PON signal into two paths, where one path is transmitted to the home ODN and then to the edge ONU; and one path of data is transmitted to an internal ONU of the FTTR optical gateway. When the optical splitter is disposed at different positions, the types of the optical interfaces connected to the PON ONU MACs of the internal ONUs are also different, which is described in detail in fig. 6 and 7 and the following text.
In an optional embodiment, with reference to fig. 6, the FTTR optical gateway further includes: the optical splitter is connected with the OLT short-range optical interface, the optical splitter is connected with the edge ONU, the optical splitter is also connected with the ONU short-range optical interface, and the ONU short-range optical interface is connected with the PON ONU MAC.
The first ONU standard optical interface is used for receiving a downlink PON signal of a local side OLT, performing photoelectric conversion on the downlink PON signal and then sending the downlink PON signal to the OLT short-range optical interface; the optical splitter is used for splitting a downlink PON signal sent by the OLT short-range optical interface into two parts, wherein one part is sent to the edge ONU, and the other part is sent to the ONU short-range optical interface; the ONU short-range optical interface is configured to send the downlink PON signal to the PON ONU MAC.
The optical splitter is a non-uniform optical splitter, part of light emitted from the OLT short-range optical interface is split into light to the ONU short-range optical interface in the FTTR optical gateway through the non-uniform optical splitter, and the optical loss of the ONU short-range optical interface is relatively low in the FTTR, so that the optical power of the non-uniform optical splitter in the FTTR is relatively low, and most of the optical power is distributed to the home ODN network through a downstream PON port.
Specifically, in this embodiment, the first ONU standard optical interface receives a downstream PON signal (optical signal) sent by the local OLT through the standard ODN network, and converts the downstream PON signal into a downstream high-speed PON data signal (electrical signal), and the OLT short-range optical interface converts the downstream high-speed PON data signal into a short-range optical signal, and then sends the short-range optical signal to the edge ONU through the home ODN. Because the standard ODN network has larger optical loss, optical signals when downlink PON signals of the local side OLT reach the FTTR optical gateway are weaker, and the optical signals can be converted into standard high-speed PON high-speed data signals after passing through the first ONU standard optical interface and standard optical interface devices such as a photoelectric converter, a trans-impedance amplifier and a limiting amplifier in the optical interface, so that the OLT short-distance optical interface is driven.
The short-distance optical signal from the OLT short-distance optical interface is divided into a part of light to the ONU short-distance optical interface in the FTTR optical gateway through the optical splitter, and the ONU short-distance optical interface is arranged in the FTTR and has relatively low optical loss, so that the optical power of the nonuniform optical splitter divided into the interior can be relatively low, and most of the optical power is distributed to the home ODN network through the downstream PON port.
And a PON ONU MAC of the FTTR optical gateway receives the short-distance optical signal, performs PON low-speed control signal message processing, extracts burst control information from the short-distance optical signal, determines a local burst sending time slice according to the burst control information, and sends the burst control information to the processing unit. And the processing unit starts the burst sending function of the first ONU standard optical interface and the burst receiving function of the OLT short-distance optical interface according to the burst control information.
In another optional embodiment, with reference to fig. 7, the FTTR optical gateway further includes: the optical splitter is connected with the local side OLT, the optical splitter is connected with the first ONU standard optical interface, the optical splitter is also connected with the second ONU standard optical interface, and the second ONU standard optical interface is connected with the PON ONU MAC.
The optical splitter is configured to split a downlink PON signal of the local side OLT into two parts, one part of the downlink PON signal is sent to the first ONU standard optical interface, and the other part of the downlink PON signal is sent to the second ONU standard optical interface, where most of the light is sent to the edge ONU through the first ONU standard optical interface and the OLT short-range optical interface, a small part of the light is sent to a PON ONU MAC through the second ONU standard optical interface, and the PON ONU MAC inside the FTTR optical gateway is split into lower optical power to operate; the first ONU standard optical interface is configured to send the downstream PON signal to the OLT short-range optical interface after performing photoelectric conversion on the downstream PON signal, where the OLT short-range optical interface is configured to send the downstream PON signal to the edge ONU; and the second ONU standard optical interface is used for performing photoelectric conversion on the downlink PON signal and then sending the downlink PON signal to the PON ONU MAC.
In the scheme shown in fig. 6, the PON ONU MAC is configured to receive a downstream PON signal from the central office OLT, extract burst control information from the downstream PON signal, where the burst control information includes own burst control information and burst control information of a downstream edge ONU, and send the burst control information to the processing unit at a first time. And determining a local burst transmission time slice according to the burst control information, generating a PON control signal based on the local burst transmission time slice, and controlling the burst transmission of the first ONU standard optical interface and the burst reception of the OLT short-distance optical interface through the PON control signal so as to deal with the uplink transmission of the ONU of the FTTR optical gateway.
In practical application scenarios, the cost of the ONU short-range optical interface is lower than that of the ONU standard optical interface, so the scheme shown in fig. 6 is lower than that shown in fig. 7.
The first ONU standard optical interface comprises standard optical interface devices such as a photoelectric converter, a transimpedance amplifier, a limiting amplifier and the like, and due to the fact that a standard ODN network has large optical loss, when a downlink PON signal of a local side OLT reaches an FTTR optical gateway, an optical signal is weak, after the downlink PON signal passes through the first ONU standard optical interface, the downlink PON signal is amplified and subjected to photoelectric conversion after passing through the standard optical interface devices such as the photoelectric converter, the transimpedance amplifier, the limiting amplifier and the like in the optical interface, and the OLT short-distance optical interface is driven.
For the case that the PON capacity or the PON splitting ratio is insufficient, it may be considered to expand the first ONU standard optical interface in a WDM wavelength division mode.
It should be noted that, the ONU standard optical interface (including the first ONU standard optical interface and the second ONU standard optical interface) mentioned above is adapted to the multi-user PON access networking requirement of several kilometers to twenty-three kilometers, and the requirements of the related technical indexes such as optical power are high; the OLT short-distance optical interface and the ONU short-distance optical interface are only suitable for the networking requirement of about 100 meters in a family, the requirements of relevant technical indexes such as optical power and the like are much lower, and the cost is relatively lower.
Since the uplink light is burst, it is relatively complex to process the downlink broadcast, and besides, the optical-to-electrical converter, the transimpedance amplifier, the limiting amplifier, etc. of the OLT short-range optical interface of the FTTR gateway convert the uplink optical signal into a standard high-speed PON electrical signal, so as to drive the first ONU standard optical interface, it is also necessary to control the burst receiving function of the OLT short-range optical interface of the FTTR gateway and the burst transmitting function of the first ONU standard optical interface according to the burst control information sent by the local OLT.
In an actual application scenario, an optical interface corresponds to a chip implementation of a PMD (Physical Media Dependent layer interface) layer, a TC (Transmission Convergence) layer and an AMCC (Auxiliary Management and Control Channel) bottom layer of a PON corresponding to a PON ONU MAC (passive optical network unit MAC), a PON standard medium layer corresponding to a standard ODN, and a PON short-distance medium layer corresponding to a home ODN.
With reference to fig. 6 and 7, the optical interface includes an OLT standard optical interface, a first ONU standard optical interface, a second ONU standard optical interface, an OLT short-range optical interface, and an ONU short-range optical interface, that is, the OLT standard optical interface, the first ONU standard optical interface, the OLT short-range optical interface, and the ONU short-range optical interface are implemented corresponding to the PMD layers of the corresponding chips, respectively. Taking fig. 6 and 9 as an example, the OLT standard optical interface corresponds to a chip implementation of PMDA1, the first ONU standard optical interface corresponds to a chip implementation of PMDA2, the OLT short-range optical interface corresponds to a chip implementation of PMDB1, and the ONU short-range optical interface of the edge ONU corresponds to a chip implementation of PMDB 2.
The OLT upper connection port of the local side PON OLT is an electrical interface and is realized corresponding to the chip of ETH-PMD 1. Chip implementation of PMDB2 corresponding to the ONU short-range optical interface inside the FTTR optical gateway is not shown in fig. 9, and ETH-PMD2 in fig. 9 corresponds to an ethernet interface of the FTTR optical gateway (the ethernet interface is connected to a common home ONU), and ETH-PMD3 corresponds to an ethernet interface of an edge ONU.
The PON signal includes a high-speed service data stream and management control information, and the protocol hierarchy and management control information of the central office OLT, the FTTR gateway, and the edge ONU in fig. 6 are described below with reference to fig. 9. The management control information is sent from an auxiliary management control channel (OLT-AMCC) of the local side OLT, and is sent to a PON standard medium layer (corresponding to a standard ODN) through a transmission convergence layer (PON OLT-TC) of a passive optical network fiber line end and a local side physical medium related layer A1(PMDA1) of the PON. Management control information from the local side OLT to the FTTR optical gateway reaches ONU-AMCC1 through the PMDA2 or PMDB1 via ONU-TC 2. The management control information flow from the local side OLT to the edge ONU passes through the PMDA2, the PMDB1 and the PON short-distance medium layer and then reaches the ONU-AMCC2 through the PMDB2 and the ONU-TC3, and the upstream and downstream management control information flow is symmetrical. In order to control the cooperation of PMDA2 and PMDB1 on the FTTR optical gateway to the edge ONU, the central office OLT sends the management control information to the edge ONU to the FTTR optical gateway synchronously, and the AMCC layer on the FTTR optical gateway controls the burst reception function of PMDB1, the burst transmission function of PMDA2, and other control information according to the burst control information sent from the OLT.
Next, the protocol hierarchy and high-speed service data flow of the central office OLT, the FTTR gateway and the edge ONU will be described with reference to fig. 9.
The high-speed service data flow enters from an Ethernet physical medium related layer 1(ETH PMD1) of a local side OLT, is converted by an Ethernet medium access control layer 1(ETH MAC1) and a transmission convergence layer (PON OLT-TC) of a passive optical network fiber line end, and is transmitted to a PON standard medium layer (corresponding to a standard ODN) by a PON local side physical medium related layer A1(PMDA 1). The high-speed data traffic is received by the remote standard ONU physical medium related layer a2(PMDA2) of the PON on the FTTR optical gateway, then directly forwarded to the short haul central office physical medium related layer B1(PMDB1) of the PON and sent to the PON short haul medium layer (corresponding to the home ODN). The high-speed data traffic flow is firstly received by a physical medium related layer B2(PMDB2) of a far-end short-distance ONU of the PON on an edge ONU, then is converted into an Ethernet flow through an ONU-TC3, an ETH-MAC3 and an ETH-PMD3, and is directly sent to a user side for use or is converted into WIFI for use. An ONU-TC2 layer is provided on the FTTR optical gateway, where a high-speed data traffic flow may pass from PMDA2 layer to ONU-TC2 layer (corresponding to the mode of fig. 4 or fig. 5), or may pass from PMDB1 layer (corresponding to the mode of fig. 6) to ONU-TC2 layer, and the data traffic flow of ONU-TC2 layer passes through ETH-MAC2 and ETH-PMD2 and then is converted into an ethernet flow, which is directly sent to a user end or converted into WIFI for the user end. The protocol hierarchy traversed by the upstream and downstream data streams is symmetric, with the distinction that the downstream is broadcast and the upstream is bursty.
In this embodiment, the home cabling is a PON structure, which is flexible and easy to expand, and can implement one-to-many data transmission in a home network, and for signal interaction between the edge ONU and the local OLT, conversion between PON and ETH is not required, so that delay and jitter are reduced, and signal quality is improved.
In addition, a PMD relay technology is used in the home FTTR optical gateway, the conversion from a PON standard optical medium layer to a PON short-distance medium layer is realized, high-speed data is separated from low-speed PON control, an OLT PON MAC does not need to be arranged in the FTTR optical gateway, and the low-cost home all-optical networking method is realized.
Example 2:
referring to fig. in the present embodiment, an implementation method of a home all-optical network system is provided, and the implementation method specifically includes the following steps:
step 101: the PON ONU MAC receives a downlink PON signal of the local side OLT, extracts burst control information from the downlink PON signal, determines a local burst sending time slice according to the burst control information, and sends the burst control information to the processing unit.
In the embodiment, the activation of the internal ONU and the edge ONU in the FTTR optical gateway is first completed according to the specification of ITU-g.984.3, wherein the activation process includes a synchronization stage, a serial number acquisition stage and a ranging stage. In the synchronization phase, the ONU still in the inactive state initiates a local downstream synchronization and performs synchronization via downstream PHY frames. In the sequence number acquisition phase, the ONU starts learning the set of burst parameters for upstream transmission. The ONU announces its presence in the PON system by responding to the serial number grant. The optical line terminal OLT finds a newly added ONU by the serial number of the ONU and assigns a unique ONU-ID to the ONU. In the ranging phase, the ONU responds with a directed ranging grant.
Specifically, when the PON ONU MAC of the FTTR optical gateway monitors the silence ranging window, the internal ONU in the FTTR optical gateway is registered to the local OLT, and the registration is completed. The silent ranging window refers to a window generated by the central office OLT suspending the upstream transmission of all ONUs already in a working state within a certain time interval, so that the newly added ONUs can be identified. When registering in the internal ONU of the FTTR optical gateway, the local OLT may be informed of its ONU type, the number of downstream edge ONUs, and the serial number.
In this embodiment, after the FTTR optical gateway completes its registration, it continues to monitor the downlink signal of the local OLT, and when a ranging silence window is monitored, the processing unit opens the burst reception function of the OLT short-range optical interface within a corresponding time according to the silence window parameter, and continuously monitors the optical power, and in the case of light, opens the burst transmission function of the first ONU standard optical interface of the FTTR optical gateway, thereby implementing message transmission of the newly added edge ONU at the ranging silence window stage.
After the edge ONU is activated, the local side OLT distributes burst control information for the inner ONU and the edge ONU in the FTTR optical gateway and sends the burst control information to the FTTR optical gateway.
The PON ONU MAC of the FTTR optical gateway receives a downlink PON signal of the local side OLT, extracts burst control information from the downlink PON signal, determines a local burst sending time slice according to the burst control information, and sends the burst control information to the processing unit.
Specifically, the PON ONU MAC obtains a GTC frame from the downstream PON signal, extracts a bandwidth allocation map (i.e., BWmap in fig. 8) from the GTC frame, and obtains burst control information from the bandwidth allocation map, where the burst control information includes a burst transmission time slice for each edge ONU to transmit upstream, the burst transmission time slice includes a Start time (Start) and an End time (End), and each edge ONU needs to transmit an upstream signal to the local OLT on its corresponding time slice.
Step 102: the processing unit determines the burst transmission time slice of each edge ONU according to the burst control information, and is further used for calculating the start time and the end time of uplink transmission of each edge ONU by taking the local burst transmission time slice as a reference and the relative difference between the burst transmission time slice of the edge ONU and the local burst transmission time slice.
Step 103: the processing unit also intermittently starts a burst sending function of the first ONU standard optical interface and a burst receiving function of the OLT short-distance optical interface according to the starting time and the ending time of the uplink sending of each edge ONU, so that the uplink signal of each edge ONU is sent to the local side OLT.
In an actual application scenario, when the local OLT detects that the edge ONU is disconnected, the FTTR optical gateway is notified that the burst transmission function of the first ONU standard optical interface and the burst reception function of the OLT short-range optical interface do not need to be started within the start time and the end time of the upstream transmission of the edge ONU.
In an actual application scenario, the FTTR optical gateway includes an internal ONU, where the internal ONU includes a PON ONU MAC and a second ONU standard optical interface (the structure shown in fig. 7), and the second ONU standard optical interface is connected to the PON ONU MAC; or, the internal ONU includes a PON ONU MAC and an ONU short-range optical interface (as shown in fig. 6), where the ONU short-range optical interface is connected to the PON ONU MAC, the second ONU standard optical interface or the ONU short-range optical interface is configured to obtain a downlink PON signal sent by the local OLT, send the PON signal to the PON ONU MAC, extract burst control information from the downlink PON signal, and send the burst control information to the processing unit, and the processing unit determines, according to the burst control information, the start time of the burst sending function of the first ONU standard optical interface and the burst receiving function of the OLT short-range optical interface, so as to ensure that uplink PON signals do not collide with each other.
In an optional embodiment, the FTTR optical gateway further includes: the optical splitter is connected with the OLT short-range optical interface, the optical splitter is connected with the edge ONU, the optical splitter is also connected with the ONU short-range optical interface, and the ONU short-range optical interface is connected with the PON ONU MAC.
The implementation method further comprises the following steps: the first ONU standard optical interface receives a downlink PON signal of a local side OLT, and sends the downlink PON signal to the OLT short-range optical interface after performing photoelectric conversion on the downlink PON signal; the optical splitter divides a downlink PON signal sent by the OLT short-range optical interface into two parts, one part is sent to the edge ONU, and the other part is sent to the ONU short-range optical interface; and the ONU short-distance optical interface sends the downlink PON signal to the PON ONU MAC.
In another optional embodiment, the FTTR optical gateway further includes: the optical splitter is connected with the local side OLT, the optical splitter is connected with the first ONU standard optical interface, the optical splitter is also connected with the second ONU standard optical interface, and the second ONU standard optical interface is connected with the PON ONU MAC.
The implementation method comprises the following steps: the optical splitter divides a downlink PON signal of the local side OLT into two parts, wherein one part is sent to the first ONU standard optical interface, and the other part is sent to the second ONU standard optical interface; after the first ONU standard optical interface performs photoelectric conversion on the downlink PON signal, the first ONU standard optical interface sends the downlink PON signal to the OLT short-range optical interface, and the OLT short-range optical interface is used for sending the downlink PON signal to the edge ONU; and the second ONU standard optical interface performs photoelectric conversion on the downlink PON signal and then sends the downlink PON signal to the PON ONU MAC.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (17)

1. A family all optical network system is characterized in that the family all optical network system comprises a local side OLT, an FTTR optical gateway and a plurality of edge ONUs;
the FTTR optical gateway includes: the optical network unit comprises a first ONU standard optical interface, an OLT short-distance optical interface, a PON ONU MAC and a processing unit; the PON ONU MAC is connected to the processing unit, the processing unit is connected to the first ONU standard optical interface and the OLT short-range optical interface, the first ONU standard optical interface is connected to the local side OLT, and the OLT short-range optical interface is connected to each edge ONU;
the PON ONU MAC is used for receiving a downlink PON signal of the local side OLT, extracting burst control information from the downlink PON signal, determining a local burst sending time slice according to the burst control information, and sending the burst control information to the processing unit;
the processing unit is used for determining the burst sending time slice of each edge ONU according to the burst control information, and is also used for calculating the starting time and the ending time of the uplink sending of each edge ONU by taking the local burst sending time slice as a reference and the relative difference value of the burst sending time slice of the edge ONU and the local burst sending time slice;
the processing unit is configured to intermittently start a burst transmission function of the first ONU standard optical interface and a burst reception function of the OLT short-range optical interface according to start time and end time of upstream transmission of each edge ONU, so as to transmit an upstream signal of each edge ONU to the local-end OLT.
2. The home all-optical network system according to claim 1, wherein the PON ONU MAC and the processing unit are integrated on a chip to form a dedicated chip, and the dedicated chip is provided with an internet interface, wherein the internet interface includes a WiFi interface and an ethernet interface, and the device is hung down through the internet interface.
3. The home all-optical network system according to claim 1, wherein the FTTR optical gateway further comprises: the optical splitter is connected with the OLT short-range optical interface, the optical splitter is connected with the edge ONU, the optical splitter is also connected with the ONU short-range optical interface, and the ONU short-range optical interface is connected with the PON ONU MAC;
the first ONU standard optical interface is used for receiving a downlink PON signal of a local side OLT, performing photoelectric conversion on the downlink PON signal and then sending the downlink PON signal to the OLT short-range optical interface;
the optical splitter is used for splitting a downlink PON signal sent by the OLT short-range optical interface into two parts, wherein one part is sent to the edge ONU, and the other part is sent to the ONU short-range optical interface;
the ONU short-range optical interface is configured to send the downlink PON signal to the PON ONU MAC.
4. The home all-optical network system according to claim 1, wherein the FTTR optical gateway further comprises: the optical splitter is connected with the local side OLT, the optical splitter is connected with the first ONU standard optical interface, the optical splitter is also connected with the second ONU standard optical interface, and the second ONU standard optical interface is connected with the PON ONU MAC;
the optical splitter is configured to split a downstream PON signal of the local side OLT into two parts, where one part is sent to the first ONU standard optical interface, and the other part is sent to the second ONU standard optical interface;
the first ONU standard optical interface is configured to send the downstream PON signal to the OLT short-range optical interface after performing photoelectric conversion on the downstream PON signal, where the OLT short-range optical interface is configured to send the downstream PON signal to the edge ONU;
and the second ONU standard optical interface is used for performing photoelectric conversion on the downlink PON signal and then sending the downlink PON signal to the PON ONU MAC.
5. The home plenary network system of claim 3 or 4, wherein the optical splitter is a non-uniform optical splitter.
6. The home-all-optical network system of claim 1, wherein the home-all-optical network system further comprises a standard ODN and a home ODN, the local OLT is connected to the FTTR optical gateway through the standard ODN, and the FTTR optical gateway is connected to each of the edge ONUs through the home ODN.
7. The home all-optical network system according to claim 6, wherein the first ONU standard optical interface and the OLT short-range optical interface correspond to chip implementation of a PMD layer, chip implementation of a TC layer and an AMCC bottom layer of a PON corresponding to a PON ONU MAC, implementation of a PON standard dielectric layer corresponding to a standard ODN, and implementation of a PON short-range dielectric layer corresponding to a home ODN.
8. The home all-optical network system according to claim 7, wherein the downstream PON signal comprises high-speed traffic data stream and management control information, and when the downstream PON signal is management control information, the management control information is sent from an auxiliary management control channel OLT-AMCC of the local side OLT, and sent to the PON standard medium layer via a transmission convergence layer PON OLT-TC at the PON fiber line side and a local side physical medium related layer PMDA1 of the PON;
the management control information from the local side OLT to the FTTR optical gateway reaches ONU-AMCC1 through the PMDA2 or PMDB1 via ONU-TC 2;
the management control information flow from the local OLT to the edge ONU passes through the PMDA2, the PMDB1 and the PON short-distance medium layer and then reaches the ONU-AMCC2 through the PMDB2 and the ONU-TC 3.
9. The home all-optical network system according to claim 8, wherein when the downstream PON signal is a high-speed traffic data stream;
high-speed service data flow enters from an Ethernet physical medium related layer ETH PMD1 of a local side OLT, is converted by an Ethernet medium access control layer ETH MAC1 and a transmission convergence layer PON OLT-TC of a passive optical network fiber line end, and is sent to a PON standard medium layer by a PON local side physical medium related layer PMDA 1;
the high-speed data service flow from the local side OLT to the edge ONU is received by a far-end standard ONU physical medium related layer PMDA2 of the PON on the FTTR optical gateway, and then is directly transferred to a short-distance local side physical medium related layer PMDB1 of the PON to be sent to a PON short-distance medium layer; the high-speed data service flow is firstly received by a PMDB2 related to a physical medium of a far-end short-distance ONU of a PON on an edge ONU, then is converted into an Ethernet flow through an ONU-TC3, an ETH-MAC3 and an ETH-PMD3, and is directly sent to a user side for use or is converted into WIFI for use;
the high-speed data service flow from the local side OLT to the FTTR optical gateway can be from a PMDA2 layer to an ONU-TC2 layer or from a PMDB1 layer to an ONU-TC2 layer, and the data service flow of the ONU-TC2 layer is converted into an Ethernet flow after passing through ETH-MAC2 and ETH-PMD2 and is directly sent to a user side for use or is converted into WIFI for use by the user side.
10. The home all-optical network system according to claim 1, wherein when the local OLT detects that the edge ONU is disconnected, the local OLT notifies the FTTR optical gateway that the burst transmission function of the first ONU standard optical interface and the burst reception function of the OLT short-range optical interface are not required to be turned on within the start time and the end time of the upstream transmission of the edge ONU.
11. The home all-optical network system according to claim 1, wherein the high-speed data electrical signal interconnection between the first ONU standard optical interface and the OLT short-range optical interface, and the low-speed PON control signals of the first ONU standard optical interface and the OLT short-range optical interface are interconnected with the processing unit, so as to realize the separation of the high-speed data signals and the low-speed PON control signals on the circuit side.
12. The method for realizing the home all-optical network system is characterized in that the home all-optical network system comprises a local side OLT, an FTTR optical gateway and a plurality of edge ONUs;
the FTTR optical gateway includes: the optical network unit comprises a first ONU standard optical interface, an OLT short-distance optical interface, a PON ONU MAC and a processing unit; the PON ONU MAC is connected to the processing unit, the processing unit is connected to the first ONU standard optical interface and the OLT short-range optical interface, the first ONU standard optical interface is connected to the local side OLT, and the OLT short-range optical interface is connected to each edge ONU;
the implementation method comprises the following steps:
the PON ONU MAC receives a downlink PON signal of the local side OLT, extracts burst control information from the downlink PON signal, determines a local burst sending time slice according to the burst control information, and sends the burst control information to the processing unit;
the processing unit determines the burst transmission time slice of each edge ONU according to the burst control information, and is also used for calculating the start time and the end time of uplink transmission of each edge ONU by taking the local burst transmission time slice as a reference and the relative difference between the burst transmission time slice of the edge ONU and the local burst transmission time slice;
the processing unit also intermittently starts a burst sending function of the first ONU standard optical interface and a burst receiving function of the OLT short-distance optical interface according to the starting time and the ending time of the uplink sending of each edge ONU, so that the uplink signal of each edge ONU is sent to the local side OLT.
13. The method of claim 12, wherein the PON ONU MAC and the processing unit are integrated on a chip to form a dedicated chip, and the dedicated chip is provided with an internet interface, wherein the internet interface includes a WiFi interface and an ethernet interface, and the device is hung down through the internet interface.
14. The method of claim 12, wherein the FTTR optical gateway further comprises: the optical splitter is connected with the OLT short-range optical interface, the optical splitter is connected with the edge ONU, the optical splitter is also connected with the ONU short-range optical interface, and the ONU short-range optical interface is connected with the PON ONU MAC;
the implementation method further comprises the following steps:
the first ONU standard optical interface receives a downlink PON signal of a local side OLT, and sends the downlink PON signal to the OLT short-range optical interface after performing photoelectric conversion on the downlink PON signal;
the optical splitter divides a downlink PON signal sent by the OLT short-range optical interface into two parts, one part is sent to the edge ONU, and the other part is sent to the ONU short-range optical interface;
and the ONU short-distance optical interface sends the downlink PON signal to the PON ONU MAC.
15. The method of claim 12, wherein the FTTR optical gateway further comprises: the optical splitter is connected with the local side OLT, the optical splitter is connected with the first ONU standard optical interface, the optical splitter is also connected with the second ONU standard optical interface, and the second ONU standard optical interface is connected with the PON ONU MAC;
the implementation method comprises the following steps:
the optical splitter divides a downlink PON signal of the local side OLT into two parts, wherein one part is sent to the first ONU standard optical interface, and the other part is sent to the second ONU standard optical interface;
after the first ONU standard optical interface performs photoelectric conversion on the downlink PON signal, the first ONU standard optical interface sends the downlink PON signal to the OLT short-range optical interface, and the OLT short-range optical interface is used for sending the downlink PON signal to the edge ONU;
and the second ONU standard optical interface performs photoelectric conversion on the downlink PON signal and then sends the downlink PON signal to the PON ONU MAC.
16. The implementation of claim 14 or 15, wherein the optical splitter is a non-uniform optical splitter.
17. The method of claim 12, further comprising:
when the local side OLT detects that the edge ONU is disconnected, the FTTR optical gateway is informed of the starting time and the ending time of the upstream transmission of the edge ONU without starting the burst transmission function of the first ONU standard optical interface and the burst receiving function of the OLT short-distance optical interface.
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