JP2018042125A - Optical transmission device and optical transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve utilization efficiency of band width in an optical concentration network system.SOLUTION: An optical transmission device (e.g., 53) included in an optical concentration network system includes an amplifier 65 for amplifying a burst transmission signal, from an ONU28A inserted into the same TS as the insertion TS of burst signal received by the ONU28A, two times or more of the power of a burst signal branched by an optical demultiplexing repeater 57A and passing therethrough. The optical transmission device also includes an optical coupler 61b for multiplexing the amplified burst transmission signal and the passed burst signal in the same TS, and outputting a multiplexed signal, and 3R repeaters 63a-63n for finding the average value of power of the multiplexed signal as a threshold level, and restoring the burst transmission signal from the ONU28A as (H) level when the power of the multiplexed signal goes above the threshold level, and as (L) level when goes below the threshold level.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an optical transmission apparatus and an optical transmission method used in an optical concentrator network system in which a ring-type network using a PON (Passive Optical Network) or the like is configured with two optical transmission paths in different data transmission directions. About.

  PON is an optical network (network is also called NW) in which a single optical fiber with a branching device (optical coupler) inserted in the middle of an optical fiber network as an optical transmission line network can be shared by a plurality of subscribers. is there. The NW to which this PON is applied is basically a tree type, and no application to the ring type is found.

  Here, in a PON in a broadband access network, an OSU (Optical Subscriber Unit) in an OLT (Optical Line Terminal) arranged in a station building and an ONU (Optical Network Unit) arranged in a user's house are optical fibers and optical fibers. Connected via a coupler. Normally, a plurality of ONUs are connected to one OSU, and signals (data) are demultiplexed in the optical region by applying TDM or TDMA (Time Division Multiple Access) between OSUs and ONUs. Transmit data. By this transmission, resources such as an optical fiber core wire and an OLT can be shared by a plurality of users. Note that the OLT and the OSU are station-side optical line termination devices (optical transmission devices). The ONU is a subscriber device as an optical line terminating device (optical transmission device) on the user's home side.

  In PON, it is impossible to perform direct communication between ONUs, and basically only communication between OSU and ONU is supported. In this configuration, communication between ONUs must always go through the OSU. However, as shown in FIG. 8, communication between ONUs becomes possible by installing BM-T (burst optical transmitter) and BM-R (burst optical receiver) in each ONU.

  FIG. 8 shows a configuration of an optical concentrator network system (system) 10 in which a ring network to which PON is applied has a two-system optical fiber configuration. In this system 10, an optical transmission device 11 as a higher-level device and a plurality of optical transmission devices 12, 13, and 14 as lower-level devices are divided into optical demultiplexing devices 15A and 15B and optical demultiplexing repeaters 16A, 16B, and 17A. , 17B, 18A, 18B, and connected in a ring shape by two optical fibers 19A, 19B as signal transmission paths. The optical signal is transmitted counterclockwise as shown by an arrow Y1A to one optical fiber 19A, and the optical signal is transmitted clockwise as shown by an arrow Y1B to the other optical fiber 19B.

  The optical transmission device 11 is also referred to as a host device 11, and the optical transmission devices 12 to 14 are also referred to as lower devices 12 to 14. The optical demultiplexing repeaters 16A, 16B, 17A, 17B, 18A, and 18B are also referred to as repeaters 16A to 18B.

  The host device 11 is provided with two OSUs 21A and 21B having TX (transmitter) and BRX (burst receiver) connected to the optical demultiplexing device 15. Each OSU 21A, 21B is connected via an L2SW (layer 2 switch) 22 that performs a relay operation, and at least one or more external devices 23 such as computers are connected to the L2SW 22. Each of the OSUs 21A and 21B is an optical line terminating device that terminates a signal transmitted / received to / from the external device 23 and serves as a control subject.

  Each subordinate device 12-14 has the same configuration. The lower device 12 is provided with two ONUs 25A and 25B having RX (receiver), BM-R and BM-T connected to the repeaters 16A and 16B. Each of the ONUs 25A and 25B is connected via an L2SW 26, and at least one or more external devices 27 such as a computer are connected to the L2SW 26. Each of the ONUs 25A and 25B is an optical line terminating device that terminates signals transmitted to and received from the external device 27 and serves as an object for the OSUs 21A and 21B that are the main control units. This ONU becomes an object for the OSU that is the controlling entity as well in the other lower devices 13 and 14.

  In the subordinate device 13, two ONUs 28A and 28B having RX, BM-R, and BM-T connected to the repeaters 17A and 17B are arranged, and each ONU 28A and 28B is connected via the L2SW 29, and a computer or the like is connected to the L2SW 29. At least one external device 30 is connected. In the lower level device 14, two ONUs 31A and 31B having RX, BM-R and BM-T connected to the repeaters 18A and 18B are arranged, and each ONU 31A and 31B is connected via the L2SW 32, and a computer or the like is connected to the L2SW 32. At least one external device 33 is connected.

  In the ring-structured system 10 using two systems of optical fibers 19A and 19B to which such PON is applied, communication can be performed between any optical transmission apparatuses 11-14. In other words, any communication between ONUs and any communication between ONUs and OSUs can be performed.

  In the communication between the OSU and the ONU, for example, a continuous signal continuously transmitted as an optical signal from the TX of the OSU 21A is transmitted through the optical demultiplexer 15A through the optical fiber 19A in the direction indicated by the arrow Y1A. It is received by RX of ONU 25A via 12 repeaters 16A. Similarly, in this reverse direction (the direction of the arrow Y1B), a continuous signal is transmitted and received between the TX of the OSU 21B and the RX of the ONU 25B.

  In the communication between the ONU and the OSU, for example, a burst signal transmitted as a light signal from the BM-T of the ONU 25A is transmitted in the direction indicated by the arrow Y1A through the repeaters 16A, 17A, and 18A through the optical fiber 19A. And is received by the BRX of the OSU 21A via the optical demultiplexing device 15A. Similarly, in the reverse direction (the direction of the arrow Y1B), burst signals are transmitted and received between the BM-T of the ONU 25B and the BRX of the OSU 21B.

In the communication between the ONU and the ONU, for example, in the arrow Y1A direction, the burst signal transmitted from the BM-T of the ONU 25A of the optical transmission apparatus 12 is transmitted through the repeater 16A, the optical fiber 19A, and the repeater 17A. It is received by BM-R of 13 ONUs 28A. Similarly, in this reverse direction (arrow Y1B direction), burst signals are transmitted and received between the BM-T of the ONU 28B of the optical transmission apparatus 13 and the BM-R of the ONU 25B of the optical transmission apparatus 12.
As this type of prior art, there are transport networks described in Non-Patent Documents 1, 2, and 3.

Masahiro Nakagawa and five others, “Proposal of Photonic Sub-Lambda Transport Network”, The Institute of Electronics, Information and Communication Engineers, IEICE Technical Report, PN2015-115 (2006-03) Masahiro Nakagawa and five others, “Analysis of Photonic Sub-Lambda Transport Network Availability”, The Institute of Electronics, Information and Communication Engineers, IEICE Technical Report, PN2016-6 (2016-06) An V. Tran et al., “Bandwidth-Efficient PON System for Broad-Band Access and Local Customer Internetworking”, IEEE PHOTONICS TECHNOLOGY LETTERS, VOL.18, NO.5 MARCH 1, 2006. [online], [2016 Search August 23], Internet <URL: http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1593726&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F68%2F33547 % 2F01593726>

  In the system 10 shown in FIG. 8 described above, in the low-order apparatuses 12 to 14, the transmission paths including the repeaters 16A to 18B are similarly configured using passive devices such as optical couplers. For example, the subordinate device 13 shown in FIG. 9 will be described as a representative. The repeater 17A includes two optical couplers 41a and 41b, two wavelength filters 42a and 42b, a plurality of 3R repeaters (repeaters) 43a, ..., 43n, and a filter 44. The optical coupler 41a branches the burst signal transmitted via the optical fiber 19A to the filter 44 side as indicated by an arrow Y2. This branched burst signal is inserted into a TS (time slot) and transmitted. For example, suppose that it is inserted in TS1 and transmitted. The filter 44 has a characteristic of allowing only a burst signal addressed to the own node (own subordinate device) 13 to pass therethrough. Therefore, the burst signal inserted into the branched TS1 passes through the filter 44 and is received by the BM-R of the ONU 28A.

  As described above, the burst signal of TS1 is received and used only by the ONU 28A of the lower order apparatus 13. However, the burst signal of TS1 is branched by the optical coupler 41a and also passes to the wavelength filter 42a side as indicated by the arrow Y3. The passed burst signal of TS1 is separated by the wavelength filter 42a. For example, the 3R repeater 43a performs signal regeneration, waveform shaping, and timing regeneration as a 3R function, and then passes through the wavelength filter 42b. It is output to the coupler 41b. In the optical coupler 41b, the burst signal indicated by the arrow Y4 using the TS2 transmitted from the BM-T of the ONU 28A is multiplexed with the burst signal of the TS1 indicated by the arrow Y5, and the downstream subordinate device 14 (FIG. 8). Sent to.

  As described above, the TS1 burst signal transmitted to the other lower-level device 14 is a signal received and used only by the ONU 28A of the specific lower-level device 13. In other words, the burst signal insertion TS1 used only by the specific lower-level device 13 becomes a used TS (time slot) that cannot be used by the other lower-level devices 14. When such a used TS1 increases, there arises a problem that the use efficiency of the band in the system 10 decreases.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide an optical transmission device and an optical transmission method capable of improving band utilization efficiency in an optical concentration network system.

  As means for solving the above-mentioned problem, the invention according to claim 1 terminates an optical signal transmitted / received to / from an external apparatus, and controls the OSU that is a control entity of the optical line and the control entity. A plurality of ONUs serving as objects are provided in an optical concentrator network system that is connected in a ring form by a ring by an optical transmission line via an optical signal repeater, and in a unique time slot transmitted through the optical transmission line A repeater that branches the inserted burst signal from the optical transmission line, and an ONU that receives the branched burst signal addressed to its own device and inserts the burst transmission signal into a predetermined time slot and transmits it to the optical transmission line The optical transmission device having the burst inserted by the repeater and inserted in the same time slot as the time slot in which the burst signal to be passed is inserted An amplifier that amplifies the transmission signal to at least twice the power of the passing burst signal and the amplified burst transmission signal and the passed burst signal are multiplexed in the same time slot to output a multiplexed signal The optical coupler and the average value of the power of the multiplexed signal are obtained as a threshold value, and when the power of the multiplexed signal is equal to or higher than the threshold value, the level is “H” level, and when the power of the multiplexed signal is lower than the threshold value, An optical transmission apparatus comprising: a 3R repeater for restoring a burst transmission signal, wherein the restored burst transmission signal is transmitted to the optical transmission line in a state inserted in the same time slot. It is.

  According to an eighth aspect of the present invention, an optical signal transmitted / received to / from an external device is terminated, and an OSU that is a control subject of the optical line and a plurality of ONUs that are objects to the control subject are optical A burst signal inserted in a specific time slot transmitted through the optical transmission line is provided in an optical concentrator network system connected in a ring by a ring by an optical transmission line via a signal repeater, from the optical transmission line. Optical transmission by an optical transmission apparatus having a branching repeater and the ONU that receives a burst signal addressed to the branched own apparatus and inserts a burst transmission signal into a predetermined time slot and transmits it to an optical transmission line In the method, the optical transmission device includes the bar inserted in the same time slot as the time slot into which the burst signal branched and passed by the repeater is inserted. A step of amplifying the transmission signal to at least twice the power of the passing burst signal, and multiplexing the amplified burst transmission signal and the passing burst signal in the same time slot Outputting the average value of the power of the multiplexed signal and setting it as a threshold value. When the power of the multiplexed signal is equal to or higher than the threshold value, the level is set to “H” level. An optical transmission method comprising: restoring a burst transmission signal; and transmitting the restored burst transmission signal to the optical transmission line in a state inserted in the same time slot. is there.

  According to the configuration of claim 1 and the method of claim 8, a burst transmission signal having a power more than twice that of a burst signal branched and passed by a repeater is restored, and the restored burst transmission signal is After that branching, the burst signal received by the ONU can be inserted into the same time slot as the inserted time slot and transmitted to the downstream side (the side through which the signal flows). Originally, the burst signal inserted in the same time slot received by the ONU after branching flows downstream. In this case, other optical transmission apparatuses cannot use the time slot in which the burst signal is inserted. That is, since the time slot is wasted, the band utilization efficiency in the optical concentration network system (system) is lowered. However, in the present invention, as described above, the burst transmission signal can be inserted into the wasted time slot and transmitted to the downstream side, so that the system band utilization efficiency can be improved.

  The invention according to claim 2 measures the power of a burst signal received by the ONU, performs management using the measured power as the power of the passed burst signal, and amplifies the burst amplified by the amplifier A first management unit that controls the amplification degree of the amplifier so that the transmission signal has a power that is at least twice that of the managed burst signal; timing for transmitting the burst transmission signal from the ONU; and amplification by the amplifier 2. The optical transmission device according to claim 1, further comprising: a second management unit configured to control a timing at which the transmitted burst transmission signal is transmitted to the same timing as a time slot of the passing burst signal.

  According to this configuration, the power of the burst signal received by the ONU of the own optical transmission device (own device) is managed as the power of the burst signal that passes through the repeater, and with this managed power, the amplification target The power of the burst transmission signal can be appropriately amplified more than twice. Further, the transmission timing of the burst transmission signal after amplification can be controlled to the same timing as the time slot of the burst signal passing therethrough. Therefore, the amplified burst transmission signal can be inserted into the same time slot as the insertion time slot of the passing burst signal and transmitted to the optical transmission line.

  The invention according to claim 3 branches the burst signal that is branched and passed by the repeater, and receives the burst signal receiving unit that receives the branched burst signal if the branched burst signal is a burst signal addressed to its own device, The power of the burst signal received by the burst signal receiving unit is measured, the measured power is managed, and the burst transmission signal amplified by the amplifier is at least twice the power of the managed burst signal. The first management unit for controlling the amplification degree of the amplifier, the timing for transmitting the burst transmission signal from the ONU, and the timing for transmitting the burst transmission signal amplified by the amplifier, 2. The optical transmission device according to claim 1, further comprising a second management unit that controls the same time slot as the second time slot.

  According to this configuration, the power of the burst signal which is the same signal as the burst signal received by the ONU of the own device, which is passed when the repeater is branched, is measured and managed. With this managed power, the amplification target The power of the burst transmission signal can be appropriately amplified more than twice. Further, the transmission timing of the burst transmission signal after amplification can be controlled to the same timing as the time slot of the burst signal passing therethrough. Therefore, the amplified burst transmission signal can be inserted into the same time slot as the insertion time slot of the passing burst signal and transmitted to the optical transmission line.

  The invention according to claim 4 measures the power if the burst signal branched and passed by the repeater is a burst signal addressed to the optical transmission device upstream of the own device, and the measured power is measured. A first management unit that manages and controls the amplification degree of the amplifier so that the burst transmission signal amplified by the amplifier has a power more than twice that of the managed burst signal; and the burst transmission from the ONU And a second management unit configured to control a timing for transmitting a signal and a timing for transmitting a burst transmission signal amplified by the amplifier at the same timing as a time slot of the passing burst signal. Item 4. The optical transmission device according to Item 1.

  According to this configuration, the burst transmission signal of the own apparatus can be inserted into the time slot of the burst signal addressed to the optical transmission apparatus upstream of the own apparatus and transmitted downstream. Originally, the burst signal received by the ONU of the upstream optical transmission apparatus is branched for reception by the upstream optical transmission apparatus, but passes to the downstream side, so that the burst signal is inserted. The time slot is wasted because other optical transmission devices cannot be used, and this causes a reduction in bandwidth utilization efficiency in the system. However, according to the present invention, since the burst transmission signal of the own apparatus can be inserted into the useless time slot and transmitted to the downstream side, the system band utilization efficiency can be improved.

  According to the fifth aspect of the present invention, an optical signal transmitted / received to / from an external device is terminated, and an OSU that is a control subject of this optical line and a plurality of ONUs that are objects to the control subject are optical A burst signal inserted in a specific time slot transmitted through the optical transmission line is provided in an optical concentrator network system connected in a ring by a ring by an optical transmission line via a signal repeater, from the optical transmission line. An optical transmission apparatus comprising: a repeater that branches; and the ONU that receives a burst signal addressed to the branched apparatus and that inserts a burst transmission signal into a predetermined time slot and transmits the burst transmission signal to an optical transmission line. The repeater measures the power of the burst signal received by the ONU and the attenuator that attenuates the power of the burst signal that passes through the repeater while being branched by the repeater. A first management unit that performs management using the measured power as the power of the burst signal that has passed, and the burst signal that is attenuated according to the managed power is less than half of the power of the burst transmission signal A control unit for controlling the attenuation operation of the attenuator so that the burst signal attenuated by the attenuator and the burst transmission signal are multiplexed in the same time slot and a multiplexed signal is output; Then, the average value of the power of the multiplexed signal is obtained as a threshold value, and the burst transmission signal is set to the “H” level when the power of the multiplexed signal is equal to or higher than the threshold value, and to the “L” level when the power of the multiplexed signal is lower than the threshold value. A 3R repeater for restoring, so that the restored burst transmission signal is transmitted to the optical transmission line in a state inserted in the same time slot. It is an optical transmission apparatus according to claim.

  According to this configuration, the power of the burst signal received by the ONU of the own device is managed as the power of the burst signal that passes through the repeater, and according to the managed power, the burst signal that passes through It is attenuated to be less than half of the burst transmission signal from its own device. Therefore, even if the attenuated burst signal and the burst transmission signal are multiplexed in the same time slot, it is possible to restore a burst transmission signal having a power twice or more that of the attenuated burst signal.

  The invention according to claim 6 passes through the amplifier that amplifies the burst transmission signal, the timing for transmitting the burst transmission signal from the ONU, and the timing for transmitting the burst transmission signal amplified by the amplifier. The optical transmission device according to claim 5, further comprising a second management unit that controls the same timing as the time slot of the burst signal.

  In the invention according to claim 7, the control unit is configured so that the attenuated burst transmission signal is less than half of the power of the burst transmission signal amplified by the amplifier according to the managed power. The optical transmission device according to claim 6, wherein the attenuation operation of the attenuator is controlled.

  According to the configurations of the sixth and seventh aspects, it is possible to cope with a case where a large power is required for the burst transmission signal.

  ADVANTAGE OF THE INVENTION According to this invention, the optical transmission apparatus and the optical transmission method which improve the utilization efficiency of the band in an optical concentrator network system can be provided.

It is a block diagram which shows the structure of the optical concentrator network system using the optical transmission apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the optical transmission apparatus of this embodiment. It is a figure which shows the signal power processed in the optical transmission apparatus of this embodiment. It is a block diagram which shows the structure of the optical transmission apparatus of the application example 1 of this embodiment. It is a block diagram which shows the structure of the optical transmission apparatus of the application example 2 of this embodiment. It is a block diagram which shows the structure of the optical transmission apparatus of the application example 3 of this embodiment. It is a block diagram which shows the structure of the optical transmission apparatus of the application example 4 of this embodiment. It is a block diagram which shows the structure of the optical concentrator network system which made the ring type network which applied PON 2 optical fiber structure. It is a block diagram which shows the structure of the optical transmission apparatus which has ONU shown in FIG.

Embodiments of the present invention will be described below with reference to the drawings.
<Configuration of Embodiment>
FIG. 1 is a block diagram showing a configuration of an optical concentrator network system (system) using an optical transmission apparatus according to an embodiment of the present invention. However, in the system 50, the ring network to which the PON is applied is configured by two systems of optical fibers (optical transmission lines) in different data transmission directions. In the system 50, the same parts as those in the conventional system 10 (FIG. 8) are denoted by the same reference numerals, and the description thereof is omitted.

  The system 50 shown in FIG. 1 is different from the conventional system 10 in that the functional configuration of the optical transmission devices 52, 53, and 54, which are subordinate devices, is different from the conventional optical transmission devices 12 to 14 (FIG. 8). There is. In this embodiment, the functional configurations of the optical demultiplexing repeaters 56A, 56B, 57A, 57B, 58A, and 58B (also referred to as repeaters 56A to 58B) of the optical transmission devices 52 to 54 are different from the conventional configuration.

  In this system 50, communication can be performed between any optical transmission apparatuses 11, 52 to 54. That is, any communication between ONUs and any communication between ONUs and OSUs can be performed.

  For communication between the OSU and the ONU, for example, a continuous signal continuously transmitted as an optical signal from the TX of the OSU 21A is transmitted through the optical demultiplexer 15A through the optical fiber 19A in the direction indicated by the arrow Y1A. It is received by the RX of the ONU 25A via the repeater 56A of the device 52. Similarly, in this reverse direction (the direction of the arrow Y1B), a continuous signal is transmitted and received between the TX of the OSU 21B and the RX of the ONU 25B. If the OSU has a burst transmitter, burst signals can be transmitted and received between the OSU and the ONU.

  In the communication between the ONU and the OSU, for example, a burst signal transmitted as an optical signal from the BM-T of the ONU 25A is transmitted in a direction indicated by an arrow Y1A through the repeaters 56A, 57A, and 58A through the optical fiber 19A. And is received by the BRX of the OSU 21A via the optical demultiplexing device 15A. Similarly, in the reverse direction (the direction of the arrow Y1B), burst signals are transmitted and received between the BM-T of the ONU 25B and the BRX of the OSU 21B.

  In the communication between the ONU and the ONU, for example, in the direction of the arrow Y1A, a burst signal transmitted from the BM-T of the ONU 25A of the optical transmission device 52 is transmitted to the optical fiber 19A via the repeater 56A. Is received by the BM-R of the ONU 28A via the repeater 57A of the optical transmission device 53. Similarly, in this reverse direction (arrow Y1B direction), burst signals are transmitted and received between the BM-T of the ONU 28B of the optical transmission apparatus 53 and the BM-R of the ONU 25B of the optical transmission apparatus 52.

  The configuration of the optical transmission apparatuses (also referred to as subordinate apparatuses) 52 to 54 in which burst signals are relayed by the repeaters 56A to 58B will be described with reference to FIG. Each of the optical transmission devices 52 to 54 has the same configuration, and FIG. 2 shows the configuration of the optical transmission device 53 as a representative. FIG. 2 shows the configurations of the repeater 57A and the ONU 28A, which are one of the configurations related to the two optical transmission lines.

  The repeater 57A includes two optical couplers 61a and 61b, two wavelength filters 62a and 62b, a plurality (n) of 3R repeaters (repeaters) 63a, ..., 63n, a filter 64, and an amplifier 65. It is prepared for.

  The optical couplers 61a and 61b are connected in series via an optical fiber 19A in the burst signal transmission direction indicated by arrows Y11a and Y11b. The optical coupler 61a on the upstream side (the side from which the signal flows) branches the burst signal transmitted from the external upstream side as indicated by an arrow Y12a, and the branch output side is connected to the input side of the filter 64. It is connected. The output side of the filter 64 is connected to the input side of the BM-R of the ONU 28A.

  The burst signal branched by the optical coupler 61a is inserted into, for example, TS (time slot) 1 and transmitted. The filter 64 has a characteristic of passing only a burst signal addressed to its own node (also referred to as its own device or its own optical transmission device) 53, as indicated by an arrow Y12b. Alternatively, it has a characteristic of transmitting only the wavelength used by the burst signal addressed to its own node 53. Accordingly, the branched burst signal of TS1 passes through the filter 64 and is received by the BM-R of the ONU 28A. That is, TS1 of the branched burst signal is a TS (time slot) that is received and used only by the lower-level device 53, and cannot be used by other lower-level devices (for example, the lower-level device 54 in FIG. 1). It becomes finished TS1. The burst signal inserted into this used TS1 is also referred to as a used TS signal. The own node constitutes its own device described in the claims.

  The optical coupler 61b on the downstream side (the side through which the signal flows) multiplexes two signals. The used TS signal indicated by the arrow Y11b input from one input end and the input from the other input end are input. The transmission TS signal (described later) indicated by the arrow Y13b is multiplexed at the same TS (same timing). The output side of the optical coupler 61b is connected to the input side of the wavelength filter 62a.

  The burst transmission signal from BM-T is inserted into the same TS1 as the burst signal transmitted from the external upstream side is inserted, and the burst transmission signal of TS1 is amplified by the amplifier 65. This amplified burst transmission signal is the transmission TS signal.

  The amplifier 65 amplifies the power (amplitude) of the TS1 burst transmission signal from the BM-T to at least twice the power of the used TS signal, and outputs a transmission TS signal. FIG. 3A shows the power (amplitude) P1 of the used TS signal, and FIG. 3B shows the power P2 of the transmission TS signal that is twice or more the power P1. The amplification of the burst transmission signal may be performed by incorporating an amplifier in the BM-T.

  Further, the used TS signal and the transmission TS signal shown in FIGS. 3A and 3B are inserted into TS1 at the same timing as shown by a one-dot chain line L1 in the vertical direction of the drawing. For this reason, the used TS signal and the transmission TS signal are multiplexed in the same TS1 by the optical coupler 61b (FIG. 2). As shown in FIG. 3C, the multiplexed signal is a signal having a power P3 obtained by adding the powers P1 and P2.

  Returning to FIG. 2, the wavelength filter 62a separates and outputs the input burst signal for each wavelength. The wavelength filter 62a has an output terminal connected to each input side of n 3R repeaters 63a to 63n. The output side of each 3R repeater 63a to 63n is connected to n input terminals of the wavelength filter 62b, and the output side of the wavelength filter 62b is connected to the optical fiber 19A.

  As shown in FIG. 3D, the 3R repeaters 63a to 63n perform 3R processing on optical signals such as burst signals. That is, signal reproduction, waveform shaping, and timing reproduction are performed, and thereafter, an average value of the power of the multiplexed signal is obtained, and “0” and “1” determination processing of the multiplexed signal is performed using this average value as a threshold value. As a result of this determination, if the power of the multiplexed signal is “1” that is equal to or greater than the threshold, the transmission TS signal of power P2a (“H” level) shown in FIG. On the other hand, if the power of the multiplexed signal is “0” which is less than the threshold, the transmission TS signal without power (“L” level) shown in FIG. Thus, the burst transmission signal (transmission TS signal) inserted into TS1 can be restored. Note that the power P2a in the case of the “H” level is the power P2 shown in FIG. 3B or other levels of power.

<Operation of Embodiment>
Next, burst signal transmission / reception operations by the optical transmission apparatuses 52 to 54 of the present embodiment will be described. However, the optical transmission device (lower device) 53 shown in FIG. 2 will be described as a representative.
As shown by the arrow Y11a in FIG. 2, the burst signal inserted into TS1 transmitted from the upstream side of the optical fiber 19A is branched by the optical coupler 61a. If the branched burst signal of TS1 is addressed to the own node 53, it passes through the filter 64 and is received by the BM-R of the ONU 28A. The received burst reception signal of TS1 is transmitted to the external device 30 via the L2SW 29 shown in FIG.

  Further, as indicated by an arrow Y11a in FIG. 2, the TS1 burst signal from the external upstream side is branched by the optical coupler 61a, and is transmitted to the downstream optical coupler 61b as a used TS signal. The

  On the other hand, the burst transmission signal inserted into TS1 transmitted from the BM-T of the ONU 28A is amplified by the amplifier 65. The amplification of the burst transmission signal is performed at least twice the power P1 of the used TS signal shown in FIG. As a result, as shown in FIG. 3B, a transmission TS signal having a power P2 that is twice or more the power P1 is output to the optical coupler 61b. In the optical coupler 61b, the used TS signal with power P1 and the transmission TS signal with power P2 are multiplexed in the same TS1. This multiplexed signal has a power P3 obtained by adding the powers P1 and P2 shown in FIG. 3C, and is output to the wavelength filter 62a shown in FIG.

  In the wavelength filter 62a, the multiplexed signal is separated and output to the corresponding 3R repeater 63a. In the 3R repeater 63a, 3R processing is performed on the multiplexed signal. That is, the average value of the power of the multiplexed signal is calculated to determine a threshold value, and “0” and “1” determination processing of the multiplexed signal is performed based on this threshold value. By this determination processing, a burst transmission signal (transmission TS signal) in which the H level (power P2) and the “L” level shown in FIG. The transmission TS signal of this TS1 is transmitted to the optical fiber 19A through the wavelength filter 62b as indicated by the arrow Y14, and is transmitted to the downstream subordinate device 54 (FIG. 1).

<Effect of embodiment>
As described above, the system 50 in which the optical transmission devices (lower devices) 52 to 54 according to this embodiment are provided terminates the optical signal transmitted / received to / from the external device 23 and controls the optical line. OSUs 21A and 21B, and a plurality of ONUs 25A, 25B, 28A, 28B, 31A, and 31B that are objects to the control subject are optical fibers (optical transmission lines) via optical signal repeaters 56A to 58B. It is configured to be annularly connected by a ring of 19A and 19B.

  The optical transmission device (for example, 53) includes a repeater 53 that branches a burst signal inserted in a specific TS (time slot) transmitted through an optical fiber (for example, 19A) from the optical fiber 19A, and the branched self-transmission device. And an ONU 28A that receives the burst signal addressed to the apparatus and inserts the burst transmission signal into a predetermined TS and transmits it to the optical fiber 19A. The optical transmission device 53 has the following configuration.

  The burst transmission signal from the ONU 28A inserted in the same TS as the TS into which the burst signal that is branched and passed by the repeater 53 is inserted is twice the power of the burst signal (used TS signal) of the TS1 that passes. The amplifier 65 that amplifies the above is provided. Further, an optical coupler 61b that multiplexes the amplified burst transmission signal and the passed used TS signal with the same TS and outputs a multiplexed signal is provided. Further, the average value of the power of the multiplexed signal is obtained and set as a threshold value. When the power of the multiplexed signal is equal to or higher than the threshold value, the burst transmission signal from the ONU 28A is set to the “H” level. 3R repeater (for example, 63a) to be restored. Then, the restored burst transmission signal is transmitted to the optical fiber 19A while being inserted into the same TS.

  According to this configuration, a burst transmission signal having a power more than twice that of a burst signal that is branched and passed by the repeater 57A is restored, and the restored burst transmission signal is converted into a burst received by the ONU 28A after the branching. It can be inserted into the same TS as the signal insertion TS and transmitted downstream.

  Originally, a burst signal inserted in the same TS that has been passed at the same time as the branching will flow downstream or upstream as a used TS signal. In this case, the other optical transmission devices 54 and 52 on the downstream side or the upstream side cannot use the TS (used TS) in which the burst signal is inserted. That is, since the TS is wasted, the bandwidth utilization efficiency in the system 50 is reduced. However, in this embodiment, since the burst transmission signal can be inserted into the wasted TS and transmitted to the downstream side or the upstream side, the band utilization efficiency of the system 50 can be improved.

<Application Example 1 of Embodiment>
FIG. 4 is a block diagram illustrating a configuration of an optical transmission device (lower device) according to Application 1 of the embodiment of the present invention. An optical transmission device 53-1 (or 52-1, 54-1) illustrated in FIG. 4 is provided in the system 50 illustrated in FIG. 1 instead of the optical transmission devices 52 to 53. In FIG. 4, the optical transmission device 53-1 is shown as a representative, and the wavelength filters 62a and 62b shown in FIG. 2 are omitted, and only the 3R repeater 63a is shown.

  The optical transmission device 53-1 of the application example 1 shown in FIG. 4 is different from the optical transmission device 53 (FIG. 2) of the above-described embodiment in that the repeater 57A1 further includes a used TS power management unit (also referred to as a power management unit). 66) and a TS transmission timing management section (also referred to as a timing management section) 67. The used TS power management unit 66 constitutes a first management unit described in claims, and the TS transmission timing management unit 67 constitutes a second management unit described in claims.

  The power management unit 66 measures the power of the burst signal of TS1 received by the BM-R, and performs management using the measured power as the power of the used TS signal that has passed through the optical coupler 61a. In addition, when the amplifier 65 amplifies the burst transmission signal, the power management unit 66 performs control to amplify the burst transmission signal so that the power is twice or more that of the used TS signal to be managed.

  In the timing management unit 67, the timing when the burst transmission signal is transmitted from the BM-T and when the burst transmission signal is amplified and output by the amplifier 65 are the same as TS1 of the burst signal passing through the optical coupler 61a. Control to be timing. With this control, the burst transmission signal from the BM-T and the amplified burst transmission signal are managed so as to be inserted into TS1.

  The amplifier 65, the power management unit 66, and the timing management unit 67 may be provided in the ONU 28A.

  In the optical transmission device 53-1 having such a configuration, it is assumed that the burst signal of TS1 branched by the optical coupler 61a passes through the filter 64 and is received by the BM-R of the ONU 28A as indicated by an arrow Y12a. At this time, the power management unit 66 measures the power of the received burst signal of TS1, and uses this measured power as the power of the used TS signal that has passed through the optical coupler 61a, as indicated by an arrow Y11a. .

  On the other hand, when a burst transmission signal is transmitted from the BM-T, the timing management unit 67 controls the transmission timing to be the same as TS1 of the burst signal that has passed through the optical coupler 61a. This controlled burst transmission signal is inserted into TS 1 and output to amplifier 65.

  The output burst transmission signal is amplified by the amplifier 65. At this time, the power management unit 66 makes the amplification degree of the burst transmission signal of the amplifier 65 more than twice the power of the used TS signal currently being managed. It is controlled to become. When the burst transmission signal amplified in accordance with this control is output from the amplifier 65, the timing management unit 67 controls the burst transmission signal to have the same timing as TS1 of the burst signal that has passed through the optical coupler 61a. The burst transmission signal amplified in accordance with this control is inserted into TS1 and output to the optical coupler 61b. Subsequent operations are the same as those in the embodiment with reference to FIG.

<Effect of Application Example 1>
As described above, the optical transmission devices (lower devices) 52-1 to 54-1 of the application example 1 are configured as follows.

  The optical transmission device (for example, 53-1) measures the power of the burst signal received by the ONU (for example, 28A), and performs management to use the measured power as the power of the burst signal that has passed through the optical coupler 61a. The power management unit 66 controls the amplification degree of the amplifier 65 so that the burst transmission signal amplified by the amplifier 65 has a power twice or more that of the burst signal to be managed. Also, a configuration including a timing management unit 67 that controls the timing of transmitting a burst transmission signal from the ONU 28A and the timing of transmitting the burst transmission signal amplified by the amplifier 65 to the same timing as the TS of the burst signal that passes through the ONU 28A. did.

  According to this configuration, the power of the burst signal received by the ONU 28A of the own node is managed as the power of the burst signal passing through the optical coupler 61a, and the power of the burst transmission signal to be amplified is managed with this managed power. Can be appropriately amplified twice or more. Further, the transmission timing of the burst transmission signal after amplification can be controlled to the same timing as the TS of the burst signal that passes through. For this reason, the burst transmission signal after amplification can be inserted into the same TS as the insertion TS of the burst signal passing therethrough and transmitted to the optical fiber 19A.

<Application Example 2 of Embodiment>
FIG. 5 is a block diagram illustrating a configuration of an optical transmission device (lower device) according to an application example 2 of the embodiment of the present invention. The optical transmission device 53-2 (or 52-2, 54-2) illustrated in FIG. 5 is provided in place of the optical transmission devices 52 to 53 in the system 50 illustrated in FIG. In FIG. 5, the optical transmission device 53-2 is shown as a representative, and the wavelength filters 62a and 62b shown in FIG. 2 are omitted, and only the 3R repeater 63a is shown.

  The optical transmission device 53-2 of the application example 2 shown in FIG. 5 is different from the optical transmission device 53-1 of the application example 1 (FIG. 4) in that a repeater 57A2, an optical coupler 61c, a filter 68, The BM-R 69 is provided, and the power management unit 66 is connected between the BM-R 69 and the amplifier 65. The optical coupler 61c, the filter 68, and the BM-R 69 constitute the burst signal receiving unit described in the claims.

The optical coupler 61c is connected to the optical transmission path between the optical couplers 61a and 61b, branches the used TS signal that has passed through the upstream optical coupler 61a, and sends the used TS signal downstream. It is to pass through.
The filter 68 is connected between the branch side of the optical coupler 61c and the BM-R 69, and allows only a burst signal addressed to the own node to pass therethrough. That is, since the used TS signal that has passed through the upstream optical coupler 61a is a burst signal addressed to the own node, it passes through the filter 68 and is received by the BM-R 69.

  The power management unit 66 performs management processing for measuring the power of the used TS signal received by the BM-R 69. Further, when the amplifier 65 amplifies the burst transmission signal, the power management unit 66 performs control to amplify the burst transmission signal so that the power is twice or more that of the used TS signal being managed. The amplifier 65, the power management unit 66, and the timing management unit 67 may be provided in the ONU 28A.

  In the optical transmission device 53-2 having such a configuration, as shown by an arrow Y15, the used TS signal (the burst signal of TS1) branched by the optical coupler 61c passes through the filter 68 and is received by the BM-R 69. Is done. At this time, the power management unit 66 measures the power of the received used TS signal and manages this measured power.

  On the other hand, when a burst transmission signal is transmitted from the BM-T, the timing management unit 67 causes the transmission timing to be the same as the used TS signal (the burst signal of TS1) that has passed through the optical coupler 61c. Be controlled. This controlled burst transmission signal is inserted into TS 1 and output to amplifier 65.

  The output burst transmission signal is amplified by the amplifier 65. At this time, the power management unit 66 makes the amplification degree of the burst transmission signal of the amplifier 65 more than twice the power of the used TS signal currently being managed. It is controlled to become. When the burst transmission signal amplified in accordance with this control is output from the amplifier 65, the timing management unit 67 uses the same timing as TS1 of the used TS signal (TS1 burst signal) that has passed through the optical coupler 61c. Become. That is, the amplified burst transmission signal is inserted into TS1 and output to the optical coupler 61b. Subsequent operations are the same as those in the embodiment with reference to FIG.

<Effect of Application Example 2>
As described above, the optical transmission devices (lower devices) 52-2 to 54-2 of the application example 2 are configured as follows. However, the optical coupler 61c, the filter 68, and the BM-R 69 constitute a burst signal receiving unit.

  In addition to the configuration of the repeater 57A1 of the application example 1, the burst signal branched and passed by the repeater 57A2 is branched, and if the branched burst signal is a burst signal addressed to the own node, the burst signal is received. A burst signal receiving unit. Further, the power management unit 66 measures the power of the burst signal received by the burst signal reception unit, manages the measured power, and the burst transmission signal amplified by the amplifier 65 is the burst signal to be managed. The amplification degree of the amplifier 65 is controlled so that the power is twice or more.

  According to this configuration, the same signal as the burst signal received by the ONU 28A of the own apparatus 53-2, that is, the power of the burst signal that passes through one side at the time of branching of the repeater 57A2 is measured and managed, and this management is performed. With the power, the power of the burst transmission signal to be amplified can be appropriately amplified twice or more. Further, the transmission timing of the burst transmission signal after amplification can be controlled to the same timing as the time slot of the burst signal that passes. For this reason, the amplified burst transmission signal can be inserted into the same time slot as the insertion time slot of the passing burst signal and transmitted to the optical transmission line.

<Modification of Application Example 2>
In addition, in FIG. 5, the burst signal branched by the optical coupler 61c through the filter 68, which is a constituent element of the burst signal receiver, is a burst signal addressed to the optical transmission apparatus upstream of the own apparatus 53-2. For example, you may make it pass to the BM-R69 side.

  In the case of this configuration, a burst signal addressed to the upstream optical transmission device 52-2 of the own device 53-2 is received, and the burst transmission signal of the own node is inserted into TS1 of this burst signal and transmitted downstream. Can do. Originally, the burst signal received by the ONU 25A (see FIG. 1) of the upstream optical transmission device 52-2 is received by the upstream optical transmission device 52-2, but passes downstream. The TS1 in which the burst signal is inserted becomes useless because other optical transmission devices cannot be used, and causes a reduction in the band utilization efficiency in the system 50. However, in the configuration of this modification, the burst transmission signal of the own node can be inserted into the useless time slot and transmitted downstream, so that the utilization efficiency of the band of the system 50 can be improved.

<Application Example 3 of Embodiment>
FIG. 6 is a block diagram illustrating a configuration of an optical transmission device (lower device) according to an application example 3 of the embodiment of the present invention. An optical transmission device 53-3 (or 52-3, 54-3) illustrated in FIG. 6 is provided in place of the optical transmission devices 52 to 53 in the system 50 illustrated in FIG. FIG. 6 shows the optical transmission device 53-3 as a representative, and the wavelength filters 62a and 62b shown in FIG. 2 are omitted, and only the 3R repeater 63a is shown.

  The optical transmission device 53-3 of the application example 3 shown in FIG. 6 is different from the optical transmission device 53 (FIG. 2) of the above embodiment in that a repeater 57A3 is further added to an FDL (Fiber Delay Line). 71, a VOA (Variable Optical Attenuator) 72, a VOA control unit 73, and the above-described used TS power management unit (power management unit) 66. The VOA 72 constitutes an attenuator described in claims, and the VOA controller 73 constitutes a controller described in claims.

  The VOA 72 attenuates the power of the used TS signal (the burst signal of TS1) that has passed through the optical coupler 61a and the FDL 71.

  The power management unit 66 measures the power of the burst signal of TS1 received by the BM-R, performs management to use the measured power as the power of the used TS signal that has passed through the optical coupler 61a, and uses this The power of the finished TS signal is output to the VOA control unit 73.

  The VOA control unit 73 controls the VOA 72 so that the power of the used TS signal input to the VOA 72 is less than half of the power of the burst transmission signal from the BM-T according to the power input by the management. Controls the damping operation.

The FDL 71 performs a delay so that the attenuation operation of the VOA 72 by the attenuation control of the VOA control unit 73 for attenuating the used TS signal that has passed through the optical coupler 61a coincides.
The power management unit 66 and the VOA control unit 73 may be provided in the ONU 28A.

  In the optical transmission device 53-3 having such a configuration, it is assumed that the burst signal of TS1 branched by the optical coupler 61a passes through the filter 64 and is received by the BM-R of the ONU 28A as indicated by an arrow Y12a. At this time, the power management unit 66 measures the power of the received burst signal of TS1, and uses this measured power as the power of the used TS signal that has passed through the optical coupler 61a, as indicated by an arrow Y11a. . The power used is output to the VOA control unit 73.

  On the other hand, a used TS signal that is a burst signal of TS1 that has passed through the optical coupler 61a is input to the VOA 72 via the FDL 71. At this time, the VOA control unit 73 converts the power of the used TS signal input to the VOA 72 according to the power of the used TS signal input from the power management unit 66 to the power of the burst transmission signal from the BM-T. The attenuation operation of the VOA 72 is controlled so as to be equal to or less than half of the above.

  By this attenuation control, the power of the TS signal used by the VOA 72 is attenuated to less than half of the power of the burst transmission signal from the BM-T. The relationship between the power of the attenuated used TS signal and the power of the burst transmission signal is the same ratio as the amplitude relationship of each signal shown in FIGS. 3 (a) and 3 (b). The attenuated used TS signal and the burst transmission signal from BM-T are inserted into the same timing, that is, TS1, and output to the optical coupler 61b. Subsequent operations are the same as those in the embodiment with reference to FIG.

<Effect of Application Example 3>
As described above, the optical transmission devices (lower devices) 52-3 to 54-3 of Application Example 3 are configured as follows.

  The repeater 57A3 includes a VOA 72 as an attenuator that attenuates the power of the used TS signal (TS1 burst signal) that has passed through the optical coupler 61a. Moreover, the power management part 66 which measures the power of the burst signal received by BM-R of ONU28A, and manages using this measured power as the power of the said used TS signal which passed is provided. Further, a VOA control unit that controls the attenuation operation of the VOA 72 so that the attenuated used TS signal becomes less than half the power of the burst transmission signal from the BM-T of the ONU 28A according to the managed power. 73.

  According to this configuration, the power of the burst signal received by the ONU 28A of the own apparatus 53-3 is managed as the power of the used TS signal (TS1 burst signal) passing through the repeater 57A3. Depending on the power, the used TS signal passing therethrough is attenuated so as to be less than half of the burst transmission signal from the BM-T of the own device 53-3. For this reason, even if the used TS signal and the burst transmission signal passing through are multiplexed in the same time slot, a burst transmission signal having a power twice or more that of the used TS signal can be restored.

<Application Example 4 of Embodiment>
FIG. 7 is a block diagram showing a configuration of an optical transmission apparatus (lower apparatus) according to Application 4 of the embodiment of the present invention. An optical transmission device 53-4 (or 52-4, 54-4) shown in FIG. 7 is provided in place of the optical transmission devices 52 to 53 in the system 50 shown in FIG. In FIG. 7, the optical transmission device 53-4 is shown as a representative, and the wavelength filters 62a and 62b shown in FIG. 2 are omitted, and only the 3R repeater 63a is shown.

  The optical transmission device 53-3 of the application example 4 shown in FIG. 7 is different from the optical transmission device 53-3 (FIG. 6) of the above-described embodiment in that the repeater 57A4, the amplifier 65 shown in FIG. The timing management unit 67 is provided.

  In this application example 4, as in application example 3 above, the VOA 72 attenuates the power of the used TS signal in accordance with the attenuation control of the VOA control unit 73, but the power of the burst transmission signal from the BM-T is increased. Amplified.

<Effect of Application Example 4>
It is possible to cope with a case where a large power is required for the burst transmission signal. For example, if the burst transmission signal is further amplified as described above, it is necessary to increase the power of the burst transmission signal when the transmission destination is farther away. However, such a case can be dealt with.

  However, the power of the used TS signal input to the VOA 72 is equal to or less than half of the power of the burst transmission signal amplified by the amplifier 65 according to the power input by the management. The attenuation operation of the VOA 72 may be controlled.

  In addition, about a concrete structure, it can change suitably in the range which does not deviate from the main point of this invention.

19A, 19B Optical fiber 21A, 21B OSU
25A, 25B, 28A, 28B, 31A, 31B ONU
50 Optical Concentration Network System 52, 53, 54, 52-1, 53-1, 54-1, 52-2, 53-2, 54-2, 52-3, 53-3, 54-3, 52-4 , 53-4, 54-4 Optical transmission devices 56A, 56B, 57A, 57B, 58A, 58B Optical demultiplexing repeaters 61a, 61b, 61c Optical couplers 62a, 62b Wavelength filters 63a, ..., 63n 3R repeaters 64, 68 filters 65 Amplifier 66 Used TS Power Management Unit 67 TS Transmission Timing Management Unit 69 BM-R
71 FDL
72 VOA (Attenuator)
73 VOA control unit (control unit)

Claims (8)

An optical signal transmitted / received to / from an external device is terminated, and an OSU that is the control main body of this optical line and a plurality of ONUs that are objects to the control main body are optical signals transmitted through an optical signal repeater. A repeater that is provided in an optical concentrator network system connected in a ring form by a ring by a transmission line, and that branches a burst signal inserted in a specific time slot transmitted through the optical transmission line from the optical transmission line, and the branch An optical transmission device having the ONU that receives the burst signal addressed to itself and inserts the burst transmission signal into a predetermined time slot and transmits the burst transmission signal to the optical transmission line,
The repeater is
An amplifier that amplifies the burst transmission signal inserted in the same time slot as the time slot into which the burst signal that has been branched and passed by the repeater has been inserted, to at least twice the power of the burst signal that passes through;
An optical coupler that multiplexes the amplified burst transmission signal and the passed burst signal in the same time slot and outputs a multiplexed signal;
The average value of the power of the multiplexed signal is obtained as a threshold, and the burst transmission signal is restored to the “H” level when the power of the multiplexed signal is equal to or higher than the threshold and to the “L” level when the power of the multiplexed signal is lower than the threshold. With 3R repeater
An optical transmission apparatus characterized in that the restored burst transmission signal is transmitted to the optical transmission line in a state inserted in the same time slot. A burst signal in which the burst signal received by the ONU is measured, the measured power is used as the power of the burst signal that has passed through, and the burst transmission signal amplified by the amplifier is managed in the burst A first management unit that controls the amplification degree of the amplifier so that the power is twice or more that of the signal;
A second management unit that controls a timing at which the burst transmission signal is transmitted from the ONU and a timing at which the burst transmission signal amplified by the amplifier is transmitted to the same timing as the time slot of the passing burst signal. The optical transmission device according to claim 1. A burst signal receiving unit that branches the burst signal that is branched and passed by the repeater, and that receives the branched burst signal if the branched burst signal is a burst signal addressed to its own device;
The power of the burst signal received by the burst signal receiving unit is measured, the measured power is managed, and the burst transmission signal amplified by the amplifier is at least twice the power of the burst signal to be managed. A first management unit for controlling the amplification degree of the amplifier,
A second management unit that controls a timing at which the burst transmission signal is transmitted from the ONU and a timing at which the burst transmission signal amplified by the amplifier is transmitted to the same timing as the time slot of the passing burst signal. The optical transmission device according to claim 1. If the burst signal branched and passed by the repeater is a burst signal addressed to the optical transmission device upstream of the own device, the power is measured, and the measured power is managed and amplified by the amplifier. A first management unit for controlling the amplification degree of the amplifier so that the burst transmission signal is at least twice the power of the managed burst signal;
A second management unit that controls a timing at which the burst transmission signal is transmitted from the ONU and a timing at which the burst transmission signal amplified by the amplifier is transmitted to the same timing as the time slot of the passing burst signal. The optical transmission device according to claim 1. An optical signal transmitted / received to / from an external device is terminated, and an OSU that is the control main body of this optical line and a plurality of ONUs that are objects to the control main body are optical signals transmitted through an optical signal repeater. A repeater that is provided in an optical concentrator network system connected in a ring form by a ring by a transmission line, and that branches a burst signal inserted in a specific time slot transmitted through the optical transmission line from the optical transmission line, and the branch An optical transmission device having the ONU that receives the burst signal addressed to itself and inserts the burst transmission signal into a predetermined time slot and transmits the burst transmission signal to the optical transmission line,
The repeater is
An attenuator for attenuating the power of the burst signal passing therethrough while being branched at the repeater;
A first management unit that performs management to measure the power of a burst signal received by the ONU and use the measured power as the power of the passed burst signal;
A control unit that controls the attenuation operation of the attenuator so that the attenuated burst signal is equal to or less than half the power of the burst transmission signal according to the managed power;
An optical coupler that multiplexes the burst signal attenuated by the attenuator and the burst transmission signal in the same time slot and outputs a multiplexed signal;
The average value of the power of the multiplexed signal is obtained as a threshold, and the burst transmission signal is restored to the “H” level when the power of the multiplexed signal is equal to or higher than the threshold and to the “L” level when the power of the multiplexed signal is lower than the threshold. With 3R repeater
An optical transmission apparatus characterized in that the restored burst transmission signal is transmitted to the optical transmission line in a state inserted in the same time slot. An amplifier for amplifying the burst transmission signal;
A second management unit for controlling the timing of transmitting the burst transmission signal from the ONU and the timing of transmitting the burst transmission signal amplified by the amplifier to the same timing as the time slot of the passing burst signal; The optical transmission device according to claim 5, further comprising: The controller is
According to the managed power, the attenuation operation of the attenuator is controlled so that the attenuated burst transmission signal becomes half or less of the power of the burst transmission signal amplified by the amplifier. The optical transmission device according to claim 6. An optical signal transmitted / received to / from an external device is terminated, and an OSU that is the control main body of this optical line and a plurality of ONUs that are objects to the control main body are optical signals transmitted through an optical signal repeater. A repeater that is provided in an optical concentrator network system connected in a ring form by a ring by a transmission line, and that branches a burst signal inserted in a specific time slot transmitted through the optical transmission line from the optical transmission line, and the branch An optical transmission method by an optical transmission apparatus having the ONU that receives the burst signal addressed to itself and inserts the burst transmission signal into a predetermined time slot and transmits it to the optical transmission line,
The optical transmission device is:
Amplifying the burst transmission signal inserted in the same time slot as the time slot into which the burst signal that has been branched and passed by the repeater is inserted to at least twice the power of the passing burst signal;
Multiplexing the amplified burst transmission signal and the passed burst signal in the same time slot and outputting a multiplexed signal;
The average value of the power of the multiplexed signal is obtained as a threshold, and the burst transmission signal is restored to the “H” level when the power of the multiplexed signal is equal to or higher than the threshold and to the “L” level when the power of the multiplexed signal is lower than the threshold. And steps to
Transmitting the restored burst transmission signal to the optical transmission line in a state of being inserted in the same time slot.

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