TW201203891A - Optical communication system and communication apparatus - Google Patents

Abstract

This invention includes a ring network consisted of nodes (OLT1, ring nodes 21 to 2n) having a ROADM function, a remote node received in the node consisting the ring network, and a star network in which the remote node and one or more ONU (10G-ONU510, 1G-ONU51, 10G/1G-ONU5101) are connected via an optical coupler 4 in a one-to-many connection way, wherein a node (OLT1) of the nodes consisting the ring network performs a PON control action containing up-band allocation control with respect to respective ONU in the system.

Description

201203891 6. EMBODIMENT OF THE INVENTION: TECHNICAL FIELD The present invention relates to an optical communication system in which a side device and a subscriber side device (joiner terminal device) are connected in one-to-one manner. [Prior Art] One form of optical communication system Ρ 0 N (passive optical fiber network, P assi V e Optical Network) is arranged in a central office with a star coupler and a fiber. A side-side device (〇LT: Optical Line Terminal, optical line terminal device) and a plurality of subscriber terminal devices (〇NU: Optical Network Unit) connected to the subscriber's house are connected in one-to-one manner, and uplink The direction (from the direction of the joining party to the central office) is time-divisional multi-communication, and the downstream direction is continuous communication. The function of filtering the downlink signal by having the ONU identifier given to the frame on the 0NU side is based on the economical communication system capable of accommodating a plurality of ONUs in one 0LT. Popularization (for example, refer to Non-Patent Document 1). In addition, in recent years, standardization of the i 〇 Gbps class for the purpose of increasing the communication capacity of the access network has been completed (for example, 'Reference Non-Patent Document 2'). The standard is a 10 Gbps version of the lGbps class defined by the conventional IEEE 802.3, which is defined as a 0 LT that can mix and receive the conventional 1 Gbps Ν 0 Ν and 10 Gbps l 〇 ΕΡ Ν Ν 和 和 和 和 和 和 和 和 和 和The function that the 0NU should implement is old, and πυ_τ also develops the standardization of the PON of the lOGbps class. When these international standards are applied, the communication speed of the 'Ρ0Ν interval is 10 times'. In this case, two merits are considered. The first advantage is that 3 322835 201203891 uses the communication carrier in such a way that the number of additional persons in each GLT is the same as the number of participants in the iGbps level, thereby making each of the participants It is the favor of the capacity increase of the p(10) interval. The second advantage is that the user can use the communication carrier by allowing the subscribers of each 0LT to accommodate more than 1GbpS-level subscribers, thereby reducing the operating cost (eGst) and adding Provides services (communication capacity) of the same level or above with 1 Gbps class. In general, the 1 Gbps P〇N star coupler uses a maximum of 32 divergence or even 64 |discrimination, and the above divergence number is due to the small communication capacity and the optical transmission caused by the divergence of the star-combiner. The path attenuation (i〇ss) and the age of the inability to achieve 'but the number of containment that has been obtained from multiple divergence has been reviewed. For example, the patent document discloses a multi-division method, which uses a plurality of side-side devices installed in a central office, and is connected to a WM light combiner that combines PGN signals of different wavelengths into a multiplexed or wavelength-divided wave. The wavelength multi-signal to be combined by the WDM blessing device is connected to a plurality of interrogators (tran_der) capable of transmitting the Ρ0Ν signal corresponding to the wavelength of the specific side-side device by one optical fiber and the star county combiner. Then, by l = 1 money and the star face H money to answer the respondent and the complex circle, so that the uplink direction can receive and transmit the p〇N signal in a time-sharing multiple manner. (Prior Art Document) (Patent Document) Patent Document 1: JP-A-2008-206008 (Non-Patent Document) Non-Patent Document 1: Non-Patent Document 1: IEEE 802. 3 322835 4 201203891 Non-Patent Document 2: IEEE 802. 3av [Summary of the Invention] (Problems to be Solved by the Invention) When considering the effective use of the 10 Gbps class Ρ0 Ν device, the communication speed of each entrant is increased as compared with the consideration, so as to increase the number of entrants per 〇LT and reduce the use of the communication carrier. It is better to use the shape cancer which is cost and also improves the satisfaction of the subscriber. With such an application form, 更多LT is shared by more subscribers, and as a result, the consumption power of the 0LT (the total consumption power of the local side) is reduced, and the low-consumption power consumption that is widely popular in the world is followed. However, if the regulations specified in the international standard of the lOGbps class (the above-mentioned non-patent document 2) are used, the transmission quality deteriorates due to the divergence, and the distance between the central office and the subscriber's house of the current service cannot be shortened. It is difficult to achieve multiple divergence. For example, although the power of the LT and the transmitter is increased, or the amplifier is inserted into the optical fiber, and the service distance is disproportionated, the transmission power of the LT and (10) U is improved, and the system is improved. The crisis level of the fiber laying operator (hazard 1 eve 1) is difficult to use and the amplifier is not easy to use the uplink signal to generate operational or technical problems. In the method disclosed in the above-mentioned Patent Document 1, the method of the side-side installation and the sputum is not changed, and the question of further inserting the inquiry is more divergent, but it is difficult to achieve low-consumption power. In addition to the common problem of 'I' and 'Knowledge', when the service is provided by a 0lt, it is connected to the central 322835 5 201203891 device by a wire. Therefore, it is a central office device or fiber (especially the trunk). 'There is a problem of expanding the area of the obstacle.

When the number of accommodating devices is increased (multiple divergence), and the power-saving device and the subscriber device can be improved, and the line is faulty, communication and reliability are produced. (Means for Solving the Problem) In order to solve the above-described problems and achieve the object, the present invention is characterized in that the present invention includes a ring network which is composed of a node having a function of R0ADM and which is contained in a The nodes Μ, Μ and the star network constituting the ring network are connected to the remote node and one or more ONUs via the optical combiner to form a node of the ring network. The node of the division is operated as 0LT, and the Ν0Ν control operation including the allocation control of the uplink bandwidth for each 系统 in the system is executed. (Effects of the Invention) The optical communication system of the present invention achieves the effect of realizing low power consumption of the system. [Embodiment] Hereinafter, embodiments of an optical communication system and a communication device according to the present invention will be described in detail based on the drawings. Further, the present invention is not limited to the embodiment. In each of the embodiments, a network that supports two different speeds of 1 Gbps * 10 讥 eggs has been described. However, it is a simple illustration that simply understands the gist of the invention, and does not limit the scope of the invention. It can also include a higher speed subscriber access system. 322835 6 201203891 Embodiment 1. <System Configuration> First, the overall configuration of the system will be described. Fig. i is a view showing a configuration example of the first embodiment of the optical communication system of the present invention. As shown in the figure, the optical communication system of the present embodiment has the following configuration: a ring type network which connects a plurality of nodes (0LT 1, and a ring type node 2丨~2〇) with a double-stranded fiber (trunk fiber). And the remote node (RN) 3 ιι 3 Ρ Ρ, 32 丨 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 , 1G-0NU5!, 10G · lG-〇NU5m), which is connected to rn via optical fiber and optical consumables (32 divergence combiner) 4. Also '1 OG_ONU5lD is capable of 1 OGbps communication in both directions 0NU (for example, as defined by IEEE802.3av), 1G_0NU5l is an ONU that can perform 1Gbps communication in both directions (for example, as defined by IEEE8023), and 10G · 1G-0NU51()1 can be uplinked. 1 Gbps, communication NU in the downlink direction of 10 Gbps (for example, as defined by 〇8〇2.3 &amp; ν). In the following description, when simply stated as "0NU", it means

10G-ONU5!. , 1G-0NU5!, and i〇G · lG-0NU5m. In addition, the RN is connected to the 0LT1, and can also connect various legs to the RN. In the present embodiment, the case where the optical combiner 4 is formed as a 32-difference coupler is described, but another divergence number may be created. In the optical communication system shown in Fig. 1, the 0LT1 is connected to the upper network and the ring network, and has multiple separation units, two redundant IF control units, and R〇ADM (Rec). 〇nHgUrabie 〇ptiCai 7 322835 201203891

Md/D Qing Multiplexer). Each ring node is a communication device of the same composition, with a job (10) and a responder. Each of the communication devices rn having the same configuration ’ has a voice responder and a monitor control unit. Further, the 0LT1 is a communication device having a function of operating as a 0LT in addition to the function of each ring node, and the optical communication system according to the present embodiment is a ring-shaped node in the prior art. The (10) function (function that acts as a sin) that is owned by the communication device (which is placed at each RN in i2) is integrated into one ring node to create 〇LTi. The multi-separation unit of 〇m outputs purely from the upper (four) line (frame) to either of the two 0LT_IFs, and outputs the upstream signal light from the OLT-1F to the upper network. QLT_t F is a variety of processes that operate as a side device of the PON. Detailed explanation. In addition, among the two (four) and (four), the - system is set as the Buddhism system and the other system is set as the preparatory system. Monitoring and control unit Monitoring (fault detection) in the system, and the path at the time of failure detection. The R_M part of each ring type node of the 0LT1 mouthpiece is used for the extraction of the specific wavelength and the output of the additional path in the flow ring 矣 field (light). The inquiry and response H of each ring type node performs the received network type network length conversion. * RN's inquiry and answer n are also connected (4) signal light ^ attack and change 'however, in the uplink direction, the optical burst signal with communication jitter/long variable is also implemented as the terminal, and is transformed into RN and 〇Lt丨通: The processing of a continuous signal of light having a wavelength of at least one wave or more. On the other hand, in the downlink direction, the signals of the respective responders are extracted in advance from the specific communication wavelength plane 2 defined by each RN, and a specific number is used using the wavelength of ^322835 201203891 specified by the standard specifications. ° The frame format transmits the communication letters 0LT1 and RN3ii~t^~, Ρ (the RN r connected to the ring node 2) is connected to the number of the ring nodes 22) s 1^ is connected to the rn number of the ring node 2n) and is connected by the % type on the solid U, that is, the point 2ι~2η (the number of the ring nodes constituting the ring network of the η system) The continuous optical surface 0TU is transmitted at a higher speed than the communication speed between the RN and its subordinates (1GG-0NU, 1G ONU U and l〇G · 1G_〇NU) (0ptica bu channel Transport) Unit) transmits and communicates with the frame. On the other hand, the interrogator contained in each RN is connected to the 0NU system and its P0N connected to it by the same star topology. The communication is performed by the conventional TDMA_p (10) method. Further, as shown in the figure, the optical communication system of the present embodiment is characterized in that the 0LT function is integrated into one of the nodes (communication devices) constituting the ring network. The 0LT function is aggregated on one node in order to simplify the description' and does not have to be aggregated into one. The 0LT function is distributed over a part of the nodes. <Configuration of 0LT> Next, the configuration of the 0LT1 will be described. Fig. 2 is a view showing a configuration example of the 0LT1 shown in Fig. 1. Here, an example of the system LT1 In order to perform the control according to the IEEE standard, the '0LT1 system includes the multiple separation unit 11, the OLTs IF12A and 12B, the monitoring control unit 13 composed of the active system monitoring control unit ι3 and the preparatory system monitoring control unit 13B, and 322835 9 201203891 ROAM unit 14. The 0LT-IFs 12A and 12B and the monitoring control unit 13 (the active system monitoring control unit 13A and the standby system monitoring control unit 13B) are connected by a monitoring control bus. Further, 0LT-IF12A The 12B and the monitoring control unit 13 constitute an OLT processing means. The multiple separation unit 11 receives the downlink signal light (frame) from the upper network via the NNI (Network Network Interface). The signal light is output to either of the two 0LT-IFs. In addition, the uplink signal received from the 0LT-IF12A and 12B is transmitted to the upper network. The 0LT-IF12A and 12B have the same configuration, and either one is set. In the case of the active system, the other system is set as the standby system. In Fig. 2, 0LT-IF12A is set as the active system. The 0LT-IF12A and 12B are the memory necessary for the operation of the CPU 12-1 and the CPU 12-1 (memory) 12-2. The high-integration PON control unit 12-3, the optical transmitter (Optical TRx) 12-4, and the packet buffer memory 12-5 constitute a 'Southern product PON control unit 12- The 3 system includes an L2 bridge 121, a PON control unit 122, a multiplexer (MUX, multiplexer) 123, a demultiplexer (DEMUX, demultipiexer) 124, a local timer (local timer) management unit 125, and a PON. - TS supply unit 126, OTN mapper/demapper 127, and SER/DES 128. The L2 bridge unit 121 performs a process of bridging signals input from a plurality of (IV) I via the multiple separation unit 11, and a VLAN tag arrangement. Ρ0Ν control unit 122 supports super in order to support a plurality of responders

Multi-link (LLID: Logical Link ID), and perform MPCP 10 322835 201203891 (Multi-Point Control Protocol) control, RTT (Round Trip Time) management, and uplink bandwidth allocation Control of control, etc. The MUX123 is an Ethernet (registered trademark) frame (hereinafter referred to as an Ethernet frame) input from the MN1 side in the downward direction, and an Ethernet frame generated by the P〇N control unit 122. Multiple. The DMUX 124 assigns the uplink frame to the Ethernet frame necessary for the p〇N control (the frame processed by the p(10) control unit 122) and the Ethernet frame to be transmitted to the NNI side. The local timer management unit 125 manages a 32-bit counter (bit cuntunter) of 16 ns granularity used in the standard by the p〇N control.

The PON TS supply 126 provides a time stamp to the MPCP frame. The 0ΤΝ mapper/demapper i27 performs a process of mapping (encapsulating) the Ethernet frame input by the NNI or the Ν0Ν control unit 122 via the Μυχι 23 and the PON-TS supply unit 126 to the 0TU frame, and The 〇 υ frame received via SER/DES 128 is demapped (decapsulated) into the processing of the Ethernet frame. SER/DES128 is connected to 0TN (〇ptical

Transport Network) - A serializer/deserializer necessary for the interface of the IF optical transmitter 12-4. _ Frame refers to the frame used by 0ΤΝ. The optical transmitter 12-4 transmits the signal light of the wavelength output from the SER/DES 128 to 111 to 1 while transmitting the wavelength from the fascia 14 to the 511] 5 sen. Signal light and output to Na/DES128. The configuration of the current system monitoring control unit 13A and the preparatory system monitoring control unit 13B of the monitoring control unit 13 is the same as that of the preparatory system monitoring control unit 13B, and performs the path detection control of the optical path conversion control 322835 11 201203891 or the LT-IF failure detection and notification, and the cho] Conversion and so on. The active system monitoring control unit 13A and the standby system include _31, the operation of the CPU 131 = 132, the management bribe receiving unit m, the TS supply unit 134, the same 135, the RTT counter 136, and the 0TN mapper/solution. A mapper m and an optical transmitter (Optical TRx) 138. The management frame transmission/reception unit 133 receives the transmission management frame via the job_14. In the management role (4), the message frame of the pure music is sent from the optical signal 138 to the GTN mapper/despapping device 137, and converted into the Ethernet by the mapper/demapper 137. The frame format is then received by the RTT calculation unit 136. On the other hand, when transmitting, the management frame of the letter box 133 occupant 6 转 式 (4) 理 box and output to the _ mapper / demapper 137 ' so 'in the Ethernet frame (management frame Doosaki After the frame is received, the old signal is sent from the optical transmission. The TS supply unit 134 receives the current time information from the time synchronization unit 135 when the management frame transmission/reception unit 133 transmits the management frame. The time synchronization unit 135 is written in the management frame as a time stamp. The time synchronization unit 135 is a management timer for the 16 ns precision counter (timer) in the same manner as the local timer management unit 125 of the above-mentioned OLT-IF. The calculation unit 136 confirms the content of the official frame received by the _mapper/demapper 137, and when it is determined that it is necessary to calculate rtt (delay), that is, the management of the time information including the RTT measurement is received. In the case of the frame, the RTT is calculated based on the received time information and the information 322835 12 201203891 (indicating the current time 134 and the time synchronization unit) managed by the time synchronization unit 135. ^ and RTT between type nodes The calculation unit 136 implements a function for measuring a propagation path delay as will be described later (the function details/demapper 137 performs the same as the above-described _ mapping state/demapper 127 In the direction), the 4-th frame is encapsulated to generate a GTU frame. In addition, the MTU is used to input the QTU frame from the optical transmitter 138. The optical transceiver 138 receives the signal light of the transmission wavelength and the signal between the R_ finger. The fiber portion 14 extracts the U-light of the specific wave of the signal light flowing through the ring network. Processing and additional processing. Further, (10) the communication unit 14 is constituted by a conventional optical switch and a responder of the general power b. <Configuration of the RN> Next, the remote node (RN) 3u is explained. The configuration of ～31P, 321~32q..., 3nr. The RNs shown in the figure are the same. Therefore, the configuration of each RN will be described by taking RN3n as an example. The third figure is the i-th diagram. An illustration of a configuration example of the RN3n shown. As shown, the RN3&quot; includes: a coupler 31, and a monitoring control unit 32, which is monitored and controlled by the active system. 32A and the preparatory system monitoring control unit 32B; and the responder unit 33 is composed of the TN 5 server 33A and the interrogator 33 33. The monitoring control unit 32 (currently, the system monitoring control unit 32A, the standby system monitoring) The control unit 32B) and the interrogator unit 33 (0TN interrogator 33A, interrogator 33B1 to 33Bn) are connected by the monitoring control 322835 201203891 bus. = The downstream communication wavelength is increased, and the length of the communication is λ421. ] The uplink signal light of 仏 grows into the reception of the downlink signal light of 2U] 21s. The transmission 2 and the wave two-system monitoring control unit 32A and the preparatory system control. M2B has the same configuration, measurement/notification, wavelength mapping setting, and the like. Fault detection 32A buckle box saw β See system monitoring control unit n first monitor control unit 32 具备 system light ptr 321 , GTN mapper / demapping _, management = reach receiver 323, TS for shirt Q0 / j In the case of B, the block 326, the synchronization unit 325, and the memory are used to operate the cpU 327 by the memory 326. The light transmitting receiver 321 is attached to the surface of the surface. 0ΤΝmapper/resolution (4) Bamboo 9 au 』 According to the receipt 1 to find j5, the shot 322 in the upward direction (toward the ring node ^, to seal the Ethernet input from the management frame to the receiving unit 323 The signal frame is generated and outputted to the surface #合器^, and in the downstream direction, the frame material input from the surface fastener 31 is edited (four) by the button frame. The tube (four) frame is sent to the letter. 4 323 receives the transmission management frame via the % type g卩 point 2ι. Management frame = Receive # g The rational frame is mapped to the 讯τ frame, that is, from the optical transmitter to the 0 ΤΝ mapper 7 demapper 322, and by (4) mapper /

After the mapper 322 converts the management frame into the Ethernet frame format, the receiving operation is performed. On the other hand, when transmitting, the management frame is sent to the receiver and the management frame of the frame format is output to the mapper/demapper 322. Therefore, in the Ethernet frame (management frame) After being mapped to 0TU 14 322835 201203891 frame, then it is transmitted from the optical transmitter 321 to the surface #合器3. After the wavelength is multiplexed, the stalk is multiplexed to the ring node 2, and the frame is sent to the receiver. When the management frame is generated, the message is received from the time synchronization unit 325 in response to the (5) request, and is written in the management frame as a time stamp. The time synchronization unit shift = a counter (timer) of 10 degrees in the same manner as the local timer management unit 125 of the above-described LT IF is used as the management time. Further, the TS supply unit 324 and the time synchronization unit 325 implement a function for measuring the delay of the transmission path with the ring node accommodating the own RN (this function is described later). The 〇TN responder 33A is provided with an optical transmitter (Optical TRx) 33b and a ΤΝ mapper/demapper 332. The optical transmitter 33i receives the transmitted signal light between the optical receiver 31i and the eyepiece 31. The map mapper/demapper 332 maps the signals received from the connected interrogators (interrogators 33β1 to 33Βη) to the 〇τ frame in the uplink direction, and outputs them to the optical transmitter 331. In addition, regarding the downward direction, the Ethernet frame is extracted from the 〇τυ frame input by the optical transmitter 331 and output to any one of the responders 33Β]~33Β„. In the example of the configuration shown in the figure, the 〇ΤΝ 旬 答 器 33 33 Α Α Α Α Α Α , , , , , 冗 Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Dual ratio burst CDR (Cl〇ck Data Recovery) 333, Dual rate Optical Burst Rx 334, lOGbps continuous optical transmitter (Continuous 10G-Tx) 335, lGbps continuous The optical transmitter (Continuous 1G-Tx) 336, and the WDM coupler 337. 15 322835 201203891 The dual ratio burst CDR 333 and the dual ratio burst illuminator 334' are used to receive uplink signals with communication speeds of iGbps and 1 Gbps. Specifically, the light is transmitted from the (10) u transmitted wavelength Α=41 and AUP42 via the WDM coupler 337, and is reproduced as a connection U of 1 Gbps and 1 〇 Gbps. Further, the 1Q Gbps continuous optical transmitter 335 And Mbps continuous light delivery The 336 system converts the 1 Gbps and 10 Gbps Ethernet frames transmitted from the 〇TN acknowledgment 33a into the wavelengths specified by the leg standard, and transmits them to the star coupler via the WDM coupler 337 (optical coupling) 4) The optical fiber side to be connected. <Communication control operation in the downlink direction> The communication control operation in the downlink direction of the optical communication system according to the present embodiment will be described using FIG. 4, and FIG. 4 shows the downlink. An illustration of an example of the communication control operation in the direction. (Sequence D1) The user frame input from the upper network interface is in the 0LT by the multiple separation unit (the multiple separation unit 11 shown in FIG. 2). Input any one of the 0LT-IF (the 0LT-IF12A, 12B shown in Figure 2, set to the side of the active system)' and provide a logical link ID (LLID) that is fixedly assigned to the (10)U at the 0LT-IF. 〇LT-IF has the function of recognizing the NUID as the NU of the RN. The user data is stored in the 0TU frame of each RN according to the llid. The TU frame is shown in Figure 5, and can be used according to each communication. Speed generation (equivalent to the situation in the upper part of Figure 5), can also be different The frame of the signal speed is mixed and stored in one frame of the TU (corresponding to the case of the lower part of Fig. 5). The 0TU frame is used as the 〇LT 1 16 322835 201203891 and each RN from the R0ADM part 14 connected to the LT-1F. The communication is output in a fixed delay manner using a predetermined communication wavelength group. In Fig. 4, U11~llII (i is the number of wavelengths necessary for the communication bandwidth of 〇LT1 and RN3u~31()) is the communication wavelength of 0LT1 and ring node 2!; U21~; I 12j (j is the number of wavelengths necessary for the communication bandwidth of 0LT1 and RN32i to RN32qi) is the communication wavelength of 0LT1 and the ring node 22, λ Inb λ lnk (k is the number of wavelengths necessary for the communication bandwidth of 0LT1 and RN3n1 to RN3nr ) The communication wavelength between 0LT1 and the ring node 2n. The actual number of wavelengths used is determined by the transmission capacity that 0LT1 and each RN should communicate with. (Sequence D2) In 0LT1, the MPCP Discovery frame for automatically logging in to 〇nu, or the MPCP frame for controlling the upstream plexus from the gate is Ρ0Ν in the 0LT-IF. The control unit 122 (see Fig. 2) is generated and MUX (multiplexed) is performed on the MUX 123 with the user frame. The control frame (MPCP Discovery frame, MPCP frame for controlling the uplink burst signal) is also received in the corresponding 0TU frame according to the LL丨D and output to the r in the same manner as the user frame. 〇 aDM part 14 side. (Sequence D3) Each of the ring-type nodes connected to the RN extracts a predetermined communication wavelength, and after wavelength conversion by the responder, outputs the RNs connected in a fixed delay manner. Each RN and the ring type node are connected by a 2 plex fiber in a p〇丨nt-to-po丨η (point-to-point) manner, and are at least one wavelength or more in response to the communication capacity between each RN and the ring node. Communication with wavelength (multi-wavelength communication). For example, the ring type node 2 extracts the letter 322835 17 201203891 from λ 111~Alii to ask for a cry. In Fig. 4, Γλ : length λ 21 λ 21s, ··· λ 21 卜 and 跗 之 v v U~A21s (s is the 0LT1 letter wavelength via the ring node, the number of wavelengths required) 2 々 RN3n communication must be both eve, by (t is, 'the length of the ring-shaped node 0LT1 and RN3ip length, number) is the ring type 'point 2】 and the necessary wavelength of the communication wave letter = It is necessary for communication between the town 1 and the RN 321 via the ring node (w is the communication wavelength of the ring node 22 and the fox, and the number of wavelengths) =:=rr (x is the wavelength of the communication via the ring type "^" , λ211~ and 21x are the number of wavelengths necessary for the communication between the ring type node 2 and the RN T1/lRN3nl. Γ==λ211, which is the number of wavelengths necessary for passing through the point 24 I) The ring type section 0LT1 ^ (sequence D4) Each RN is a 〇 TU frame stored in the wavelength group received from the upper ring node And (4) the frame and the control frame are reproduced, and then the LLID supplied to the reconstructed frame identifies the frame to which the ONU of the respondent belongs, and the fixed delay mode A plurality of interrogators assigned to the ribs (equivalent to the queries n 33B1 to 33Bn shown in Fig. 3). (Sequence D5) The interrogator in each RN converts the received user frame and control frame into wavelengths according to the communication speeds of the IEE sub-2, 3, ship 8Q2, eg, ιτυ_τ specifications, and Transferred to the painting (1QG__5i〇, 322835 201203891 G-〇NU5i, 1OG · lG-0NU5m). In Fig. 4, the communication wavelength between each interrogator and each nu is represented by l 311 and λ 312, which respectively represent the wavelength for lGbps and the wavelength for lOGbps. Further, 311 and 312 are transmitted in a wavelength multiplex manner. (Sequence D6) Each ONU (10G-ONU51 (», G-0NU5!, 10G · 1G-0NU51()1) is a user who receives the reception from the upper rn in IEEE802.3, IEEE802. 3av, and ITU-T specifications. Frames and control frames are processed for specific actions that are standardized. Also, 'steps and ring nodes of 〇DU (Opticalchannel Data Unit') used between ring nodes (in a ring network) - The steps of the 〇DU used between the RNs can be made the same. Depending on the application, the responder of the ring node can also be converted to use different steps. <Upper direction communication control action> Then use the sixth The communication control operation in the uplink direction of the optical communication system according to the present embodiment will be described. Fig. 6 is a diagram showing an example of the communication control operation in the uplink direction. (Sequence U1) Each ONU (10G-〇NU5h) ·, G-ONl^, 10G · The control frame received from the 0LT1 via the ring node and the RN, and the Auto Discovery action is performed according to the operation, and the steam is 1 LLT1. Thereafter, it is received according to 〇LTl's control frame is recorded in MPCP The time information contained in the Gate frame is transmitted to the upper-level one from the time-sharing 19 322835 201203891, and the uplink transmission data is transmitted to the control frame. The actions are controlled by IEEE8G2.3, IEEE8G2. .3av, ITU-T specifications, etc., to standardize the action. Figure 6 shows the communication wavelengths of each responder and each coffee with λ 321 and λ 322, which represent the wavelength and intestinal yang for 1 Gbps, respectively. The wavelengths used are λ 321 and λ 322 are transmitted in a time-sharing multiple manner (sequence U2)

In the Ν 各 5 5 5 ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( These two are connected to the TU frame of the 0TN format frame, and the optical signals of the wavelengths above the wavelength of the olti are used to frame the two or two ring nodes in a fixed delay manner. Wavelength multi-mode transmission)._Signal generation: also 3=Communication control action Similarly, the frame of communication speed according to each communication speed frame (refer to Fig. 5) can be mixed and accommodated in one 0TU picture 6 'Μ 孤 的 · A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A 420 to A42u of the muscle ρ (u is the communication wavelength via ^: ie, point 2丨 and paid ip, the number of wavelengths entered) is necessary for the communication of GLT1 and RN321 of the ring type r% node (w is via the ring) The communication wavelength of the node point 22 and the RN321 is 421~; the U2w is the ring type node 22 and the number of wavelengths necessary for communication), the pass# wavelength, and 421 ~;^42乂(meaning the number of wavelengths necessary for communication between OLT1 and RN3nl via the 322835 20 201203891 ring node) is the communication wavelength of the ring node 2„ and RN3nl, and λ 421 ~ λ仏 is via the ring node 〇 LTl * RN34 communication necessary wavelength number) is the communication wavelength of the ring type node 欢 and Huan r. The actual number of wavelengths used depends on the transmission capacity of the (4) RN should communicate. (Sequence U3): Shirt point The signal received from the connection is converted into communication for other ring nodes on the 0LH side of the port (the signal in the ring network is set to the wavelength group set by the therapy first, and the delay mode is Output &amp; ^ Road. In Figure 6, λ51 Η 5 Η (ί is 0LT1 and ~ long, ^ required wavelength number) (four) and ring node ^ communication wave wavelength is Yang and coffee 21 surface communication is _ (four) The communication wavelength of node 22, WH5nk (the number of wavelengths necessary for k-type node σ jin) is 0LT1 and the number of wavelengths used by the ring and each rib. The number of wavelengths used in response to the 0LT1 egg is determined by the transmission capacity of the 0LT1 egg. Sequence U4) In LT1, the R〇ADM part is inserted from each of the long-numbered lights. Μ之# Waves received by the m-points on both sides of the GLT-IF. Or 'All wavelengths extracted by H are input into the 0LT 々 IF_OT_m= entered in any one and the PG 4 system specified by R Xian is bribed. And the control frame material is transmitted to the multiple separation unit. The multiple=action m is also transmitted to the upper network side according to the multiple 15唬 received from the GLHF#7^ system according to the upper network. 322835 201203891 • and Similarly, the communication control operation in the downlink direction may be the same as the deleted ladder used for the 0DU between the ring nodes and the ring node, and may be used instead. <Several long switching control actions, and RTT (R〇und

Trip Time) Management Method> The redundant switching control operation of the optical communication system according to the present embodiment and the management method of the RTT closely related thereto will be described with reference to Figs. 7 and 8 . In general, the 'TDMA-P0N system is designed to avoid the collision of the uplink burst signals' and control the time when the burst signal transmitted by the ONU reaches the 〇LT and effectively collect the information necessary for the bandwidth allocation control in the uplink direction. 0LT and 0NU ranging (ranging, distance measurement). In the optical communication system of the present embodiment, in order to avoid the collision of the uplink burst signal between rN and 〇NU and to perform the uplink bandwidth allocation control efficiently, the distance measuring function is also required. The TDMA-P0N system used by the conventional technology supports the number of 0NUs of 0LT to be as high as 32, so the connection between 〇lt and ONU is not redundant, but the optical communication system of this embodiment will be The MAC function of 0LT is concentrated on 0LT1, so the obstacle area when the 0LT-IF in 0LT1 is faulty and the fiber is broken is expanded. In order to solve this problem, the optical communication system of the present embodiment doubles the communication path between the OLT and the RN, and realizes the high robustness of the communication network. Here, in order to double the communication path and realize high-speed conversion of the line, not only the active system communication path but also the preparatory system communication path must be separately measured in advance to control the star coupler (optocoupler 4). The uplink signal does not conflict with the 22 322835 201203891 PON-specific parameters 〇 LT and the distance between each 0NU (Rn). However, in the conventional method, there is a problem that the communication system of the active system and the communication of the standby system cannot be managed at the same time. Fig. 7 is a view showing an example of an operation when the optical communication system of the present embodiment performs communication using the active system communication path. For example, 0LT1 and 10G-ONU 5ι. The communication is performed in the uplink direction and the downlink direction in the communication path shown in FIG. The RTT of the communication path can be measured by the same distance as the conventional TDMA-P0N system. That is, according to the "Au1^ Discovery" and the MPCP communication protocol defined by the standards of IEEE802.3 and 802.3av, etc., 0LT1 can obtain RTT information between i〇g and 〇_51〇. When the RTT obtained according to this is made Active-Total, the downlink communication path trip time (TT_A), 0LT1-ring type, is used by the active system between the 0LT1-ring type and the point 2! The current system uplink communication path trip time (TT-B) between nodes, the active system communication path cyclic trip time (RTT-C) between the ring nodes 2i-RN3n, RN3u_10G_ONU 5ι. The current system communication path loop trip time (RTT_D), RTT_Active_Total can be expressed as the following equation (1). RTT_Active - Total = TT - A + RTT_C + RTT - D + TT_B (1) Fig. 8 shows the downlink 0LT1-ring type node in the optical communication system of the present embodiment which communicates with the communication path of Fig. 7. A diagram showing an example of an operation when a fiber used for communication generates a failure and is switched to a communication path of the preparatory system. The RTT_Standby___Jotal system should be applied to the control in this case. 23 322835 201203891 The downlink communication path trip time (TT_A) of the active system by the 0LT1-ring type node 2ι, and the downlink communication path of the 0LT1-ring type node 2! The time (TT_A'), and Rn_Active_T〇tal shown by the formula (1), can be expressed by the following formula (2). RTT-Standby-Total = RTT__Active_Total - TT_A + TT_A' (2) - Therefore, in the optical communication system of the present embodiment, the 〇LT1 system has a transmission path length for individually measuring the redundant transmission path and The means of preservation, so as long as the communication path of the preparatory system is set in advance, the trip time of the faulty location, the skipping time of the redundant path, and the jump of the active system can be instantaneously generated when the transmission path of the optical fiber failure or the like is generated. The time is converted to the RTT after the path conversion, and it is easy to form a verbose. The above example is a description of the case where the transmission path used by the downstream GLT1-ring type node 21 is inconvenient, but the money (4) of this implementation (4) is unified: the redundant path of the part (the optical fiber is doubled The path can also be switched to the same = method. In order to achieve the tedious switching of the above method, the monitoring control unit of the OLT 1 has a monitoring control unit of the R_M portion of the _M portion of the self-device, and the monitoring unit of the R_M portion of the bad type. In the case of the _N3ll~3lp, the monitoring unit of the paper, etc., and the function of measuring the skip time of the current pure and pre- (four) systems, (in the fourth part, the monitoring of the monitoring control is performed inside the unit) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Hereinafter, the function of the measurement of the communication path of _(10) 丨 and _ _ and the square center preparation = and 10G - _5 丨 will be described. The communication path between them is determined. 〇m First, explain the current control system and the monitoring control signal used by the system (4) ^ ^Tongshe Road's trip time measurement method. Fig. 9 is a view showing an example of the operation of transmitting the monitoring control signal of the optical communication system in the form of the present invention. 1 9 _ shows the monitoring and control of the optical communication system of the present embodiment. The Uk money communication wavelength is particularly used for the monitoring control wavelength A6sn ° in the configuration (4) network coffee and each ring type of money, for circulation on the % network The signal for monitoring and controlling the signal of the wavelength λ 611 is always dropped first, and is terminated by the monitoring control unit. Then, the extracted 0TU frame (monitoring control signal) is added and updated with the monitoring control information of the own device, and the updated monitoring control signal is transmitted to the adjacent node (0LT1 or ring node). In addition, when the received monitoring control signal contains information to be transmitted to the device connected to its own device, the information is extracted and mapped to the 0TU § hole frame, and the downstream monitoring control wavelength between and rn is used; Transfer to the RN. In addition, as shown, the uplink monitoring control wavelength between 〇LT1 and the ring node and the RN is λ712, which is used for responding to the 〇TU frame (monitoring control signal) from the ring type, or The monitoring control information that the RN should transmit is transmitted to the ring node. It then describes the functions and means necessary to determine the trip time of the active system and the preparatory system communication path. Each ring type node, each RN, and the monitoring control unit of OLT1 have a time synchronization function. For the specific hand of the time synchronization 25 322835 201203891 paragraphs can be cited GPS or IEEE802. 1AS, NTP (Network Time Protocol). The time synchronization means must be unified by the network, and the time synchronization means is required to have, for example, the same accuracy as the RTT accuracy necessary for the contained TDMA-P0N. For example, when it is a network that accommodates G-EP0N as defined in IEEE802.3 or 1OG-EPON as defined by IEEE802.3av, an accuracy of 16 ns is required. Next, a method for determining the RTT of the active system and the preparatory system communication path will be described. The trip time measurement of the active system and the standby system communication path is composed of the following steps: Measuring the transmission path delay of the ring network (the transmission path delay of each path constituting the ring network (the transmission path between adjacent nodes) a step (step #1); and a step of determining a transmission path delay between each ring type node and each RN to which its jurisdiction is connected (step #2). By performing these steps, the transmission path delay is measured, and 0LT1 is the m of the current m stored in the root f, and the delay information transmitted by executing the steps #1 and #2, and the path conversion is calculated. The method of calculating the RTT of the preparatory system is as described in Fig. 8. This is a description of the transmission path delay of the type network of steps #1 and #2 as shown in Fig. 10 and Fig. 11 A diagram of the transmission between the movements, and examples. Fig. 11 is a diagram showing a ring type node and . Example of measurement operation of the 迗 path delay (operation example of step #2) 322835 26 201203891 (Step #1) As shown in the first figure (1), (4) the monitoring unit of LT1, the time sharing unit, and the time stamp supply unit The E-frame of the filling time η is generated, and the E-frame is stored in the communication path of the 〇τ preparatory system, and the money is displayed. The money is the point 2 „. The monitoring control unit of the ring node 2η, When receiving the filling time stamp frame from the current storage pre-injury system communication path, it is saved and subtracted from the receiving time information by 0 lt^ 2n) and the ring type section 2 2 #% type is point 2n Surveillance control department

The current system and the preparatory system communication path are used to transmit the previously obtained RTT by the wavelength transfer. The 0TU frame is also filled with the imprint:: box. The point system performs such actions in sequence. That is, two: each ring type system and the preparatory system communication channel is received by the channel = when it is used by the current system, then it is represented by the receiving time, and the frame of the packet The time stamp of the transmission of the information of the source canister T1 and the state of the understated frame _ frame transmission =, respectively, the additional representation of the calculated ^: 抓 1 point between the capture, the time stamp of the time, and the indication The transmission or ring type node) is transmitted to the adjacent node (the current (4) system and the pre-4卩 between the 0LT1 points to obtain the delay information of each ring type).备^通"#的跳料信息(传(步骤#2) 322835 27 201203891 Here is a description of the ring node_action, but the 'other ring node 22~2' is also executed The same action is performed, that is, each ring type node sequentially performs the following _ actions, and accordingly, the RTT information of the active system and the standby system is notified to the monitoring control unit of (4). As shown in FIG. 11, first, The monitoring control unit of the ring type node 2i monitors the tripping time measurement request frame of the active line and the occupational system communication path, and transmits the request frame to the frame at the wavelength λ 711. The hidden monitoring control unit, the time synchronization unit, the frame generation unit, and the time stamp supply unit are generated as a response frame filled with a time stamp (transmission time information) and are λ The wavelength of 712 is transmitted to the ring node 2. The response frame is transmitted from the active system and the standby system communication path respectively. The monitoring control unit of the ring node & receives the response frame from the current source, the system, and the secret communication path. ^, Longcun the receiving moment The information is obtained by subtracting the value of the time stamp provided by the RN3n from the reception time f to double the number of RTT information. The ring node 2 is cyclically (cycilc) in the same order. Obtain the information of the arrested information of the affiliation. The obtained information is used for the monitoring control of the wavelength λ 611 attached to the self-loop type network (4) to notify the adjacent node (in this case, GLT1). The RTT information of the current system that can be used between the node 21 and each of its own nodes. ^ The type of the point and the RNs connected to it perform the same action, so that 0LT1 can finally obtain all the The RTT information of the ring system and the current system and the standby system of the 辖 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 In (4)), it is defined to determine the RTT of the preparatory system communication path, and the RTT of the preparatory system communication path is pre-measured according to the method and sequence as described above. When the communication path is broken High-speed switching. Next, the operation example of the redundant switching control will be described with reference to Fig. 12. Here, the operation when the optical fiber connecting the 0LT1 and the ring node 2ι is broken (corresponding to the case shown in Fig. 8) For example, when the optical fiber between 0LT1 and each type of node 2l is generated, and when the ring node 2 detects an alarm indicating the fault, the ring node (4) issues a (transfer) switching request message to the adjacent ring type (4) 22; The switching path is requested (steps SU, S12). Further, 'the signal transmission path is switched to the preparatory road control (the path that was previously used as the preparatory system) (step S13). When the ring type r receives the switching request message transmitted from the ring type node 21, the received message is transmitted to the adjacent ring type node 23, and the communication path (4) is also replaced with the preliminary line. Each ring type section performs the following two actions in sequence, and when the switching request message transmitted by the ring type node 2 is switched to the == part, the signal transmission path is switched to "仫", and the adjacent ring type node 2n is issued. Switching End Message: S14) Further, the unit is an RTT change request message corresponding to the post-switching path (step S15). The 0LT-IF that receives the RTT change message proceeds to m #变^' = step S16) corresponding to the post-switching path, and transmits the RTT change end message to the leg (10) S17). (4) (4) 2&quot; When receiving a response message for the transfer to GLT1, 322835 29 201203891 request message (in the above-mentioned step S14, the handover end message is transmitted), then the received handover end message is transmitted to the adjacent ring. Similarly, when the ring node other than the node 2n_1°% type node 2n receives the switching end message corresponding to the response message of == π, the message is transmitted, and the message is transmitted to the detected end. The transmission path (optical fiber) failure is %3^卩21 when the 'county bundle money transfer miscellaneous switching action. The transmission path between the &amp; type node and its ordinate (current system fiber) occurs. The rider (four) the faulty ring node uses the communication path of the standby system to transmit the handover request message to rn. Therefore, the transmission path between the RN and the RN is converted into a preliminary secret fiber, and the OLT is notified of the failure of the optical fiber between the RN and the RN. The LT1 receives the ring node and the (4) RN. The pass=time of the purpose of the failure changes the RTT according to the content of the notification (converted to the RTT corresponding to the post-switching t). Thus, the case where the optical fiber between the ring-shaped node and the grasping of the circumstance is also the same as the case where the domain on the ring-type network is faulty can be switched in two times in a short time (switching to the standby system) optical fiber). = The optical communication system of the present embodiment includes: a path 'which is composed of nodes having an R〇ADM function; and a star network' which is housed in a node constituting a ring network, and one The above 0NU is a multi-connection, and the uplink direction (from the 0NU to the RN) is time-division multiplex transmission; the one of the nodes constituting the ring network is used as a side device ( 0LT) and 322835 30 201203891 Actuation, ordering and allocation of the upstream bandwidth between each _ in the system. In addition, the transmission path including the node I and the nodes constituting the ring network and the R (four) um, and the transmission path (four) of the directional-party are defined as active; As a result, the following effects were obtained. Fang &amp; 疋 is a low-consumption electricization that is pre-aware. The reason for this is as follows. &lt; Knowing that 0 (4) is a configuration as shown in Fig. 18, in general, the 0LT frame system accommodates a plurality of 0LT-IFs. In addition, ϋ ° i 栌 栌 仫 仫 仫 仫 仫 仫 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , The signal of Ρ0Ν is directly received by the (4) network n_ into the PON-IF touch control configuration. Therefore, in addition to the control functions necessary for the 0LT of the control, the CPU can be greatly reduced. 'Invisible body, NNI side ΡΗ γ (physical layer) parts, so it can achieve low power consumption compared to the case of using conventional structure. Moreover, the conventional structure here means that 0NU is coupled via light. The configuration is directly connected to the 〇LT, that is, the RN of the optical communication system (see FIG. 1) of the present embodiment is replaced by a node that operates as 〇lt, and the QLT1 is converted into a ring. Type node 2, ~2n the same node (no need to have a node with 0LT-IF). In addition, 'can improve the reliability of the network. As mentioned above', if only the LT function is concentrated, when the transmission path fails The service barrier area will be expanded, but the optical communication system of this embodiment can be 1 LT. In addition, the service of the majority of the ONU is accommodated, and the communication path from the office side device (〇lt) to the RN 31 322835 201203891 is completely doubled. Therefore, even if the LT function is concentrated, compared to the conventional example (the above) The system of the configuration disclosed in Patent Document 1 can also improve the sinfulness. Further, since the optical communication system of the present embodiment has a means for measuring the RTT of the communication path of the preparatory system in advance, it is possible to switch at high speed when an obstacle is detected. In addition, in the conventional p(10) system, it is difficult to extend the technical problem of the increase of the optical burst signal. However, the optical communication system of the present embodiment is based on the conventional IEEE standard PDM ( Physical Medium

The Dependent and the physical media dependencies are configured to support the distance RN. The RN has a function as a repeater that converts the burst signal from the ONU uplink signal into a continuous signal, so that the RN can be easily moved to 〇. The transmission path of the NU is extended. As described above, according to the optical communication system of the present embodiment, by integrating the next-generation metropolitan area access network technology, it is possible to achieve power saving, high-speed switching from high-speed switching, and rural areas. The area (rural area) is extended for containment. Embodiment 2. The actual (fourth) state 1 describes an optical communication in which a communication wavelength used for communication of a ring network and a communication wavelength used for communication between a ring node and an RN are wavelength-converted by a ring node. system. On the other hand, in the present embodiment, an optical communication k system in which a ring node relays a signal that has not undergone wavelength conversion is described. In addition, the rtt of the active system communication path and the preliminary secret communication path which are performed by the monitoring control and the path switching operation (the redundant switching control operation) at the time of the obstacle detection are the same as those of the first embodiment since 322835 32 201203891, and therefore the description thereof is omitted. Description. Further, the description of the portion common to the optical communication system of the first embodiment will be omitted. Fig. 13 is a view showing an example of the configuration of the optical communication system of the second embodiment and the communication control operation in the downward direction. As shown in the figure, in the optical communication system of the present embodiment, the ring type 2 2 to 2: 1 of the optical communication system of the embodiment is replaced with the ring type nodes 2ai to 2an. In addition, the ring type node 2 outputs ~2&amp; is a self-loop type node 2, and the 2-2 is cut off. The ring type section of the present embodiment: 2a!~2an is not performed in the communication control operation in the downlink direction. The wavelength conversion method transmits the signal light of a specific wavelength extracted from the signal light circulating on the ring network to the ruling rN. The communication control action system of the downlink direction of the optical sensation (Sequence Dla) First, 0LT1 performs (sequence pi) and (sequence D2) as shown in Embodiment 1, and transmits the downlink signal to the ring network. (Sequence D2a) Each type of call point 2a丨~2an extracts a predetermined communication length by using a wsS (Wavelength Lect Switch) or the like in the R〇ADM unit, and allocates the extracted wavelengths to the connection (the optical fiber). (Sequence D3a The receiving ribs and the ring-shaped nodes are connected by a 2-fold optical fiber in the manner of p〇int_t〇__p〇int, and the rn-system connects the ring-shaped node to which the ring-connected node is connected to the signal distributed to itself. Maintain the wavelength at the time of extraction. In Figure 13, the Uh1H ring Type node % and Li 322835 33 201203891 The communication wavelength of the team, the communication wavelength of the m]12j system, the ring type node ~ and the called 嶋 嶋 q; the unl]lnk ring type node ^ and the communication wavelength, the actual use The number of wavelengths is determined by the transmission capacity to be communicated in (4). (Sequence D4a) Each RN performs the (frequency sequence Μ) and (Chuanjin order D5) shown in the embodiment i, and transmits the downlink signal to The circle of the jurisdiction (i〇G—〇 leg1., g-〇nu5i, 10G·1G_〇NU5lQ1). Each _ system of the RN is executed as shown in the first embodiment (sequence D6). The figure shows an example of the communication control operation in the uplink direction of the optical communication system according to the second embodiment. The ring type ton 2a wide 2an of the present embodiment is configured to perform wave switching in the uplink communication control operation. The method transmits the light received from the jurisdiction to the ring network. The communication control system in the uplink direction of the optical communication system according to the present embodiment is as follows. (Sequence Ula) Each 〇NU (10G-〇NU51() , G-0NU5i, l〇G · lG-0NU5m) is executed in the first embodiment (sequence U1), and the uplink signal is transmitted. To the upper RN. (Sequence U2a) In each RN, the interrogator converts the uplink burst signal (the signal transmitted in the time division multiple manner) received from each of the 〇NUs under its jurisdiction into a continuous signal, and further The continuous signal is received in a frame of 〇TN format frame and is fixed by a wavelength of at least 丨 wavelength specified by 0LT1, 322835 34 201203891 (wavelength multiple optical signal), with a fixed delay The way to output to the upper ring node. The οτυ frame can be generated according to each communication speed, and the frames of different communication speeds can be mixed and accommodated in a single frame. Further, in the first embodiment described above, the optical transmitter constituting the optical transmission/reception device 331 (see FIG. 3) of the RN 〇ΤΝ 内 内 各 各 ( ( ( ( ( ( ( ( ( ( , , , , , , , , , In the RN according to the embodiment, the laser (optical transmitter) is a wavelength-variable Rayleigh transmission wavelength system (4) wavelength designated by the monitoring control unit. In Fig. 14, A 51 λ 51ι is a ring type node 2 and RN3ii ~ RN3ip communication wavelength ' λ52 Η 52 · · 环 ring type node ^ and leg 21 ~ brain with a long money, A5nH5nk ring type node 2 ~ The communication wavelength with RM3nr, the actual number of wavelengths used depends on the transmission capacity that 0LT1 and each RN should communicate with. (Sequence U3a) ^The ring type switch outputs the signal received from the connected RN to the ring network as it is. (Sequence U4a) The user executes the configuration data (sequence U4) and transmits the upper user's user to the upper network side. In the optical communication system of the present embodiment, the specific wavelength of the ring network is transmitted from the signal light flowing through the ring network (4), and the (10) downlink signal is transmitted to the original state (without wavelength conversion). And will also receive the RN from the jurisdiction of the wheel to the strict coffee 妨 ^ 扪 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬 仃仏唬According to this, the same effect as the form 322 322835 35 201203891 can be obtained and implemented. In addition, the interrogator of each ring node can be omitted, and the structure of the network can be simplified. (Embodiment 3) Embodiments 1 and 2 describe an optical communication system in which a ring node and an RN are connected by an optical fiber. However, the RN shown in Embodiments 1 and 2 may be used as a ring node. And directly housed in the ring node. Therefore, this embodiment describes an optical communication system in which the RN is directly housed in the ring type node. In addition, the RTT measurement method for the active system communication path and the preliminary system communication path by the monitoring control and the path switching operation (the redundant switching control operation) for the obstacle detection are the same as those of the first embodiment, and thus the description thereof will be omitted. In addition, the description of the part common to the optical communication system of the first embodiment will be omitted. Fig. 15 is a view showing an example of the configuration of an optical communication system according to the third embodiment. As shown in the figure, the optical communication system according to the present embodiment is a ring type node 2! and RN3u to RN31P, a ring type node 22, and RN321 to RN32q..... of the optical communication system (see Fig. 1) of the first embodiment. The ring type node 2 &gt;&gt; and RN3n1 to RN3nr are replaced by a ring type node 2th, a ring type node 2b2, and a ring type node 2bn. The ring type node 2b!, the ring type node 2b2, the ring type node 2bn includes the ROADM unit, and the RN3u to RN31P, RN321 to RN32q.....RN3n1 to RN3nr described in the first embodiment (refer to 3rd) RN#11~#lp, RN# 21~# 2q, ..., RN# nl~# nr. Further, the transmitter of the optical transmitter mounted in the acknowlerder of the RN included in each of the ring-shaped nodes is a wavelength-variable laser. Among the ring nodes, the RN constitutes the ONU receiving means. 36 322835 201203891 Fig. 16 is a view showing an example of the direction of the lower direction of the optical communication system of the third embodiment = control operation. The communication control operation in the downlink direction of the optical communication system according to the embodiment will be described with reference to Fig. 16. (Sequence Dlb) First, 0LT1 performs the first embodiment (sequence, and (sequence D2), and transmits the downlink signal to the ring network. (Sequence D2b) The ring node 21^21^ is by ROADM WSs in the department (Wav ^ let

Each wavelength of Select Sw, tch)# , , is assigned to the corresponding RN. (Sequence D3b), each RN in the node extracts the signal assigned to itself from the ring-type network and transmits it to the wavelength of (4). In the figure, the input is extracted by the ring type node 2b1 and distributed to the communication wavelength in the ring type node%, and λ121]% is extracted by the ring type node 2b2 = the communication wavelength of each (10) allocated to the inside of the ring type node 2b2, The communication wavelength 2 is derived from the ring node and is allocated to the communication wavelength inside the ring node %. The actual number of wavelengths used depends on the communication capacity of the RN and the RN of each bad type (4). . (Sequence D4b) Each RN in each ring type node performs the sequence shown in the first embodiment (sequence = ' and (sequence (6)' and transmits the downlink signal to the ruling picture: °°, G__51, (10), Each of the genus is executed as shown in the first embodiment (sequence D6). 322835 37 201203891 In addition, Fig. 17 is a diagram showing an example of the communication control operation in one direction of the optical communication system according to the third embodiment. Fig. 17 is a view showing the communication control in the uplink direction of the optical communication system of the present embodiment. (Sequence Ulb) Each 〇mj (l〇G-〇NU5le, G-0NU5!, 10G · lG-0NU5m) Performing the sequence shown in Embodiment 1 (sequence υυ ' and transmitting the uplink signal to 仃RN (catch in the ring node). Among the rNs in each ring node, the responder system will be self-administered. The uplink burst signals received by each NU are converted into continuous signals, and the continuous signals are received in the 0TU frame of the frame of 0ΤΝ specification, and the wavelength of at least 1 wavelength specified by 0LT1 is taught. The optical signal is rotated in the same way as the R0ADM part in the same ring node. 〇Τϋ Λ It can be generated according to each communication speed, and can also mix and match frames of different communication speeds in one 0TU frame. In Fig. 17, 151 λ 51 i are allocated to each RN in the ring node 2b! The communication wavelength, λ 521 λ λ 52 j is the communication wavelength of each RN allocated in the ring type node 2 ,, λ5 η b; l5 nk is the communication wavelength of each RN allocated in the ring type node, and the actual number of wavelengths used This is determined by the transmission capacity to be communicated between 〇LT1 and each RN (rn in the ring node). Thus, in the optical communication system of the present embodiment, the ring-shaped node constituting the ring network is directly housed in According to the RN described in the first embodiment, it is possible to obtain the same effect as that of the first embodiment. Further, when the RN is placed in the vicinity of the ring node, it is possible to constitute an optimum network without unnecessary fibers. 38 322835 201203891 Further, in the present embodiment, it is also possible to mix the real yoke form 1 or the second embodiment, and the month b is flexible to form a network. For example, Sx is used to create only the first pass system of the first embodiment (see the first Figure) Ring-shaped stuffing, 1 lang 2! and RN3u~31P conversion cost The configuration of the ring-shaped node P&quot;' 2bl described in the embodiment, or only the %-type point 2a2 and the RN321-32q of the optical communication system (see Fig. 13) of the second embodiment are converted into the ring described in the embodiment. The configuration of the node %. (Industrial availability) The optical communication system of the present invention can be effectively utilized in a communication system for performing p(10) control, and is particularly suitable for a light having a plurality of 丨-to-multi-connection networks. [Brief Description of the Drawings] Fig. 1 is a view showing an example of the configuration of an embodiment of the optical communication system of the present invention. The second diagram shows an example of a configuration example of the office side device (0LT). Fig. 3 is a view showing a configuration example of a remote node (RN). Fig. 4 is a view showing an example of a communication control operation in the downlink direction of the optical communication system according to the first embodiment. Fig. 5 is a view showing an example of the configuration of the 0TU frame. Fig. 6 is a view showing an example of the communication control operation in the uplink direction of the optical communication system according to the first embodiment. Fig. 7 is a view showing an example of an operation when the optical communication system according to the first embodiment performs communication using the active system communication path. Fig. 8 is a view showing an operation example in the case where the optical fiber is in a failure in the optical communication system according to the first embodiment. 39 322835 201203891 Fig. 9 is a diagram showing an example of the operation of transmitting the monitoring control signal of the optical communication system according to the first embodiment. Fig. 10 is a view showing an example of the measurement operation of the transmission path delay of the ring network. Fig. 11 is a view showing an example of the operation of measuring the propagation path delay between the ring node and the RN. Fig. 12 is a flowchart showing an example of a redundant switching control sequence. Fig. 13 is a view showing an example of the communication control operation in the downward direction of the optical communication system of the second embodiment. Fig. 14 is a view showing an example of the communication control operation in the uplink direction of the optical communication system according to the second embodiment. Figure 15 is a diagram showing a configuration example of an optical communication system according to the third embodiment.

TfC 〇 Fig. 16 is a view showing an example of a communication control operation in the downlink direction of the optical communication system according to the third embodiment. The figure is a diagram showing an example of the communication control operation in the uplink direction of the optical communication system according to the third embodiment. Fig. 18 is a view showing a configuration example of a conventional olt-IF. [Main component symbol description]

1 0LT 1 , 2n, 2ai, 2az, 2an, 2bi, 2b2, 2bn ring type nodes 3u, 3ιΡ, 321, 32tl, 3nl, 3nr remote node (RN) optical light combiner

5l 1G-0NU 40 322835 201203891

5i0 10G-ONU 5i〇i 10G · 1G-0NU 11 Multiple separation unit 12A, 12B OLT-IF 12-1 '131 ' 327 CPU 12-2, 132, 326 12-3 12-4, 138, 32 331 12 -5 13

13A, 32A

13B, 32B 14 31 ' 337 32 33 33A 33Bi ' 33Bn 121 122 123 124 125 126 Memory high-product PON control unit optical transmitter (Optical TRx) Packet buffer memory monitoring control unit system monitoring control unit preparation system monitoring control Part R0ADM Part WDM Coupler Bifurcator Coupler Unit 0 ΤΝ 答 询 询 L L2 Bridge Ρ 0 Ν Control Unit Multiplexer (MUX) Demultiplexer (DEMUX) Local Timer Management Department P0N-TS Supply Department 41 322835 201203891

127, 137, 322, 332 0ΤΝ Mapper/Demapper 128 SER/DES 133, 323 134, 324 135, 325 136 333 334 335 336 Management Frame Transmission and Receiving Unit TS Supply Unit Time Synchronization Unit RTT Calculation Unit Upward Dual Ratio CDR (Clock Data Recovery) Dual Rate Optical Burst Rx lOGbps Continuous Optical Transmitter (Continuous 10G-Tx) lGbps Continuous Optical Transmitter (Continuous 1G-Tx) 42 322835

Claims (1)

201203891 七·· 2. 3. 4. Patent application scope: An optical communication system, comprising: a ring network, which is composed of nodes having the function of R0ADM; and a remote node, which is housed in the ring a node of a type network; and a 'star network', which is constructed by one-to-many connection of the aforementioned remote node and more than one 〇NU via an optical coupler, constituting a node of the aforementioned ring network One of the nodes operates as 0LT, and performs a Ν0Ν control operation including uplink bandwidth allocation control for each 〇NU in the system. The optical communication system according to claim 1, wherein the office side of the node operating as the OLT and the remote node setting data and control information are mutually performed in the υτ frame. Communication. The optical communication system of claim 1, wherein the remote node converts the optical burst signals received from the connected 〇NU into optical continuous signals, and converts the converted light continuously. The signal is transmitted by multiplexing the wavelength. In the optical communication system according to the first aspect of the patent application, the center side device is a node of the node that operates as the GLT, and the ring network extracts a specific wave. $钱U processing, and the processing of the specific wave money output to the front-end network to achieve the aforementioned curry function; and 322835 1 201203891 0LT processing means, the implementation of the system includes the allocation of the upstream bandwidth of each 0NU in the system The control operation of the control and the monitoring control operation including the measurement of the delay of the transmission path with each ONU. 5. The optical communication system according to claim 4, wherein each of the transmission paths connecting the nodes and the transmission path connecting the node and the remote node to which the node belongs is a double-stranded fiber In the configuration, the office side device and the remote node set one of the double-stranded optical fibers as the active system, and the other is set as the standby system to perform communication. The 0LT processing means is used in the monitoring control operation, and the measurement uses the foregoing. When the one of the two optical fibers is duplicated, the transmission paths between the zero and the zero volumes are delayed and stored, and the delays of the respective transmission paths between the respective ONUs are measured and stored, and the control is performed in the Ν0Ν control operation. The transmission path delay corresponding to the optical fiber used as the active system is used. 6. The optical communication system according to claim 5, wherein the node constituting the ring network performs the following operation: when detecting a transmission path with an adjacent node on the ring network; When there is a communication failure of the communication barrier or the transmission path between the remote node under the jurisdiction, the message indicating the purpose thereof is transmitted to the office side device, and the setting is changed to communicate using the optical fiber as the standby system beforehand. When the message indicating the communication failure detection is received, the message is forwarded to the office side device, and the setting is changed to communicate using the domain as the job*2 2 322835 201203891. 7. The optical communication system according to any one of claims 1 to 6, wherein the node constituting the ring network has a: a responder, which is received by the ring network. The signal light of a specific wavelength included in the signal light is wavelength-converted' and the signal light received from the remote node of the jurisdiction is also wavelength-converted. 8. The optical communication system includes: a ring network comprising a node having a ROAA power cycle b and having a plurality of ONU receiving means for accommodating a plurality of 〇NU via an optical coupler. The node constituting one of the nodes of the ring network operates as 0LT, and performs a control operation including allocation control for each uplink bandwidth in the system. 9. The optical communication system according to claim 8, wherein the station side device that is the node that operates as the aforementioned 〇L τ and the other NU housing means that are provided by the other node are in the 0 TU frame. Set data and control information to communicate with each other. 10. The optical communication system according to claim 8, wherein the ONU receiving means converts the received light burst signals received from the respective connected lines into optical continuous signals, and converts the converted lights. The continuous signal is transmitted by multiplexing the wavelength. The optical communication system according to the eighth aspect, the ninth aspect, or the tenth aspect of the invention, wherein the station side device of the node that operates as the 〇LT is 322835 3 201203891 • The R0ADM means And performing the processing of extracting signal light of a specific wavelength from the ring network and outputting signal light of a specific wavelength to the ring network to implement the foregoing ROADM function; and the OLT processing means, The 频0Ν control operation of each uplink bandwidth allocation control in the system and the monitoring control operation including the transmission path delay measurement with each ONU. 12. The optical communication system according to claim 2, wherein each of the transmission paths connecting the nodes to each other and the transmission paths connecting the nodes and the remote nodes to which they belong are divided into two. The optical fiber is configured such that the side device and the remote node communicate one of the two-folded optical fibers as the current secret and the other is set as the standby system, and the 〇LT processing means is in the monitoring control operation. The transmission path delay between each of the two multiplexed optical fibers and each of the 〇NUs is measured and stored, and each transmission path delay between each of the above-mentioned ONUs is measured and stored. In the p〇N control action, the use of the fiber-optic path delay corresponding to the use as the active system is used. 13. The optical communication system according to claim 12, wherein the node constituting the ring network performs the following operation: when detecting a transmission path with an adjacent node on the ring network; In the case of a communication failure, the message indicating the hole t is transmitted toward the office side device and the setting is changed to use the optical fiber that was previously used as the preparatory = 322835 4 201203891, and when the s receives the message indicating the communication failure detection, The message is forwarded to the side of the second office, and the settings are changed to communicate using the fiber as the standby system. 14. The +.= communication device' is a remote node that includes a ring network, is housed in a node that is pre-constructed: a typed network, and has more than one or more of the aforementioned remote nodes. In the optical communication system of the star-to-many to be connected to the multi-connection, and the other node having the R- coffee function, the communication device has the following means: the means is executed from the aforementioned ring type The operation of the network extraction, the processing of the 4th light, and the processing of the nucleus of a specific wavelength to the ring network realize the aforementioned _ work;:; 1: m pure 仃 contains the allocation of each _ in the system The control control action and the monitoring control action including the delay measurement of each of the 0_3 transmission paths. The system is equipped with a ring network (4) system t and eight _M functions and has a light coupling device. And the plurality of other nodes of the receiving means - the type network - the communication device has: a month long means, which performs processing of signal light drawn from the ring network, and a specific wavelength = The processing of the ring network is implemented to achieve the aforementioned job D = out of the column (10) The processing means includes a charge control operation for the _'2 and the upper bandwidth allocation control, and a monitoring control operation for measuring the transmission path delay between each of the 0N1 and 322835 5 201203891.