JP6546571B2 - Station equipment - Google Patents

Description

  The present invention relates to an accommodating station apparatus.

  In the access network, there is a method of distributing an optical signal whose optical power has been increased using an optical amplifier to a plurality of PONs (Passive Optical Network: passive optical network) as a method of efficiently distributing video content etc. For example, refer to Non-Patent Document 1 and Non-Patent Document 2).

  As described in Non-Patent Document 1, after obtaining multiple optical signal outputs through multiple stages of optical amplifiers and optical splitters (optical splitters) based on output optical signals from one transmission source, An optical signal is sent out on a transmission path of a one-to-many star topology such as 32 branches called PON. With such a configuration, a large number of ONUs (Optical Network Units) can be accommodated by a single OLT (Optical Line Terminal), so the cost of OLT devices can be shared by multiple users, and an economical system can be realized. It can be configured.

  Further, Non-Patent Document 2 shows a redundant configuration in the OLT. FIG. 12 shows a configuration example of an OLT that receives two systems of optical signals from the upper relay network and distributes the optical signals of a system selected from the two systems received to the access network. In this configuration, the OLT amplifies the optical power in the optical amplification unit without terminating the received optical signal in the relay amplification unit, and then distributes and outputs a plurality of optical signals in the optical distribution unit, respectively. The output of one of the light distribution units is input to the signal selection unit. The signal selection unit selects an optical signal of a system of good reception quality and outputs the selected optical signal to the optical amplification / distribution unit of the subsequent stage. Although the OLT includes two stages of optical amplification / distribution units in the same figure, it may have three or more stages.

  With such a configuration, even if a failure occurs in either of the two optical amplification units of the relay amplification unit, this is detected by the signal selection unit, and the service influence is minimized by switching to an optical signal of another system. Can be reduced to In particular, in a system that accommodates a large number of ONUs in a single OLT by optical amplification, the redundant configuration as described above is important because the influence range of the failure of the optical amplifier is large.

  In the examples of Non-Patent Documents 1 and 2, a system for performing optical analog transmission of video content, which is an RF (Radio Frequency) signal, and transmitting the optical signal without terminating it up to the ONU is shown. On the other hand, according to Non-Patent Document 3, video content in digital baseband format is optically transmitted digitally, and it is temporarily terminated when it is received by the OLT via a relay network, and 3R (equalization amplification, identification reproduction and reproduction as necessary). A configuration for distributing to the access section after performing the timing processing is shown.

  According to this configuration, since the optical signal from the relay network can be terminated at the OLT and distributed in a format (wavelength, modulation scheme, etc.) suitable for the access section, excellent reception quality can be expected in the ONU. In addition, compared to optical analog transmission, in optical digital transmission, the reception sensitivity in the ONU is high, and the optical power sent from the OLT to each PON section can be reduced. Can. This can be expected to increase the number of ONUs that can be accommodated by a single OLT, as compared to the optical analog transmission system.

Japan CATV Technology Association Standard, "FTTH Cable Television System Optical Network and Equipment", Japan CATV Technology Association, JCTEA STD-014-5.0, August 2013 "4. Realize reliable, economical wide area video distribution", 2004, [online], NTT Access Service Laboratories, ANSL R & D Times, No. 40, [August 3, 2016 search], Internet , <URL: http://www.ansl.ntt.co.jp/j/times/040/02/04.html> Hidekazu Shimizu, Akihisa Fujiwara, Toshiaki Shibaha, Hisao Yoshinaga, Tomoki Sukawa, "Connection experiment of relay network and access network in wavelength division multiplexing transmission of FM batch conversion signal and digital baseband signal", The Institute of Electronics, Information and Communication Engineers, 2016 IEICE General Conference, March 2016, B-8-20, p. 219

  In the future, in consideration of the shift from RF distribution to IP (Internet Protocol) distribution in the distribution of video content etc., optical digital transmission as described in Non-Patent Document 3 is performed, and It is expected that an access system can be efficiently distributed to a large number of ONUs, which are user home apparatuses, by using an optical amplifier.

  In addition, in such a system, as described above, a single OLT can accommodate more ONUs by once terminating the signal in the OLT and then distributing the optical signal in a format suitable for the access section. Possibly, a redundant configuration as shown in Non-Patent Document 2 is important.

  However, the redundant configuration of the OLT for distributing to the access section after the signal such as the video content transmitted by the optical digital transmission is once terminated in the OLT received via the relay network has not been clarified.

  In view of the above-mentioned circumstances, the present invention has an object to provide an accommodating station apparatus having a redundant configuration and capable of distributing a signal after terminating the signal.

  One aspect of the present invention includes an optical transmission unit that outputs an optical signal generated from a received signal, and one or more hierarchical optical amplification distribution units that amplify and branch the optical signal, and the optical transmission A signal termination selector for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals; and the signal termination selector outputs the signal termination selector An optical signal generation unit that generates and outputs an optical signal of a signal format used for a lower network from the signal and an optical transmission that divides and outputs the optical signal output from the optical signal generation unit to one or more A light-splitting unit, and the light amplification / distribution unit inputs one light signal output from the light transmission unit or another light amplification / distribution unit at the previous stage, and amplifies and outputs light power An amplification unit, and before the light amplification unit outputs The light amplification and distribution unit side light distribution unit includes a light amplification and distribution unit side light distribution unit that divides and outputs an optical signal into a plurality of parts, and the light amplification and distribution unit side light distribution unit provided in the last stage of the light amplification and distribution unit It is a host station device that sends to the network of

  One aspect of the present invention includes an optical transmission unit that outputs an optical signal generated from a received signal, and one or more hierarchical optical amplification distribution units that amplify and branch the optical signal, and the optical transmission And a plurality of signal termination units respectively terminating a plurality of redundant signals received from an upper network, and a corresponding optical signal of a signal format used for a lower network from the signal terminated by the signal termination unit. A plurality of optical signal generation units for generating and outputting, an optical switch for outputting one optical signal selected from the optical signals output from the plurality of optical signal generation units, and the optical signal output from the optical switch A monitor light distribution unit that distributes a part of the light power, and selection of the light signal by the optical switch based on information obtained as a result of monitoring the one of the light signals distributed by the monitor light distribution unit control Control unit, and a light distribution unit that distributes and outputs the other light signal distributed by the monitor light distribution unit to one or more, and the light amplification and distribution unit comprises the light transmission unit or the front stage. Another optical amplification unit that inputs one optical signal output from the optical amplification distribution unit, amplifies the optical power and outputs the same, and light that divides and outputs the optical signal output from the optical amplification unit An optical distribution and distribution unit side optical distribution unit, wherein the optical amplification and distribution unit side optical distribution unit included in the last stage optical amplification and distribution unit is a receiving station apparatus for transmitting the distributed optical signal to a lower network .

  One aspect of the present invention includes an optical transmission unit that outputs an optical signal generated from a received signal, and one or more hierarchical optical amplification distribution units that amplify and branch the optical signal, and the optical transmission A signal termination selector for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals; and the signal termination selector outputs the signal termination selector A signal distributing unit for dividing and outputting the plurality of signals into a plurality, and a plurality of the signals output from the signal distributing unit are respectively input, and an optical signal of a signal format used for a lower network is generated from the input signals A plurality of optical signal generation units for outputting, an optical switch for outputting one optical signal selected from the optical signals respectively output from the plurality of optical signal generation units, and the optical signal output from the optical switch A monitor light distribution unit that distributes a part of the light power, and selection of the light signal by the optical switch based on information obtained as a result of monitoring the one of the light signals distributed by the monitor light distribution unit And a light distribution unit that distributes and outputs the other light signal distributed by the monitor light distribution unit to one or more, and the light amplification and distribution unit includes the light transmission unit or the preceding stage And one optical signal output from the optical amplification and distribution unit, and an optical amplification unit that amplifies and outputs optical power, and the optical signal output from the optical amplification unit is divided into a plurality and output. An accommodating station apparatus including an optical amplification and distribution unit side optical distribution unit, wherein the optical amplification and distribution unit side optical distribution unit included in the last stage optical amplification and distribution unit transmits the distributed optical signal to a lower network is there.

  One aspect of the present invention includes an optical transmission unit that outputs an optical signal generated from a received signal, and one or more hierarchical optical amplification distribution units that amplify and branch the optical signal, and the optical transmission A signal termination selector for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals; and the signal termination selector outputs the signal termination selector An optical signal generation unit that generates and outputs an optical signal of a signal format used for a lower network from the signal and an optical transmission that divides and outputs the optical signal output from the optical signal generation unit to one or more A unit-side light distribution unit, wherein the light amplification and distribution unit inputs one of the optical signals output from the light transmission unit or another light amplification and distribution unit at the previous stage, and divides and outputs the light signal into a plurality of light signals; A light distribution unit and the input light distribution unit A plurality of optical amplification units each of which inputs the plurality of optical signals and amplifies and outputs optical power, and light which outputs one optical signal selected from the optical signals output from each of the plurality of optical amplification units Information obtained as a result of monitoring a switch, an optical distribution unit for monitoring that distributes the optical power of a part of the optical signal output from the optical switch, and one of the optical signals distributed by the optical distribution unit for monitoring A control unit for controlling selection of the light signal by the optical switch based on the light switch, and a light distribution unit for dividing and outputting the other light signal distributed by the monitoring light distribution unit to one or more, and The optical distribution unit included in the optical amplification and distribution unit is an accommodating station device that transmits the distributed optical signal to a lower network.

  One aspect of the present invention includes an optical transmission unit that outputs an optical signal generated from a received signal, and one or more hierarchical optical amplification distribution units that amplify and branch the optical signal, and the optical transmission A signal termination selector for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals; and the signal termination selector outputs the signal termination selector An optical signal generation unit that generates and outputs an optical signal of a signal format used for a lower network from the signal and an optical transmission that divides and outputs the optical signal output from the optical signal generation unit to one or more A unit-side light distribution unit, and the light amplification and distribution unit inputs one of the light signals output from the light transmission unit or another light amplification and distribution unit in the previous stage, and divides and outputs the light signal into a plurality of light signals A light distribution unit and the input light distribution unit output Each of the plurality of optical signals is input, and a plurality of optical amplification units for amplifying and outputting optical power and the corresponding optical signals output from the optical amplification units are input, divided into a plurality, and output A plurality of optical distribution units, a plurality of optical switches for outputting one optical signal selected from the optical signals output from each of the plurality of optical distribution units, and a part of the optical signals output from the corresponding optical switches And a plurality of monitoring light distribution units for distributing the optical power of the light, and light obtained by the corresponding optical switch based on information obtained as a result of monitoring the one of the light signals distributed by the corresponding monitoring light distribution unit. The monitor optical distribution unit, which includes a plurality of control units that control signal selection, and the monitoring optical distribution unit that the final stage optical amplification distribution unit includes, transmits the other optical signal to a lower network. .

  One aspect of the present invention includes an optical transmission unit that outputs an optical signal generated from a received signal, and one or more hierarchical optical amplification distribution units that amplify and branch the optical signal, and the optical transmission A signal termination selector for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals; and the signal termination selector outputs the signal termination selector An optical signal generation unit that generates and outputs an optical signal of a signal format used for a lower network from the signal and an optical transmission that divides and outputs the optical signal output from the optical signal generation unit to one or more A unit-side light distribution unit, the light amplification and distribution unit inputs each of the plurality of light signals output from the light transmission unit or the light amplification and distribution unit in the previous stage, and the light power of the input light signal Optical amplification to amplify An optical switch for outputting optical signals of a plurality of operation systems selected from the optical signals output from the plurality of optical amplification units and an optical signal of one or more spare systems, and a plurality of operations output from the optical switches A plurality of monitoring light distribution units for inputting each of the optical signals of the system and distributing optical power of a part of the input optical signals; a plurality of the optical signals of a spare system output from the optical switch; A control unit that controls selection of an operation system optical signal by the optical switch based on information obtained as a result of monitoring one of the optical signals distributed by the monitoring optical distribution unit, and the corresponding monitoring light And a plurality of light distribution units provided in the last stage of the light amplification and distribution unit, the plurality of light distribution units including the plurality of light distribution units that distribute the other light signal output from the distribution unit to one or more outputs. Send signal to lower network That is a central office equipment.

  One aspect of the present invention includes an optical transmission unit that outputs an optical signal generated from a received signal, and one or more hierarchical optical amplification distribution units that amplify and branch the optical signal, and the optical transmission A signal termination selector for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals; and the signal termination selector outputs the signal termination selector An optical signal generation unit that generates and outputs an optical signal of a signal format used for a lower network from the signal and an optical transmission that divides and outputs the optical signal output from the optical signal generation unit to one or more A unit-side light distribution unit, the light amplification and distribution unit inputs one of the light signals output from the light transmission unit or another light amplification and distribution unit in the previous stage, and the light power of the input light signal Multiple optical amplification units that amplify the A plurality of optical distribution units that distribute and output the optical signal output from the optical amplification unit into a plurality, and one of the plurality of optical signals distributed by the corresponding optical distribution unit of the operation system, and a spare system A plurality of optical switches for outputting one optical signal selected from among the plurality of optical signals distributed by the optical distribution unit, and optical power of a part of the optical signals output from the corresponding optical switch A plurality of monitor light distribution units for distributing the light, one of the light signals distributed by each of the plurality of monitor light distribution units, and one of the light signals output from the spare light distribution unit. And a control unit that controls selection of optical signals by the plurality of optical switches based on information obtained as a result of monitoring, and the monitoring light distribution unit provided in the last stage of the light amplification and distribution unit is the other one Send optical signal to lower network To a receiving station.

  One aspect of the present invention is the accommodation station apparatus described above, wherein the light distribution unit also has the function of the monitor light distribution unit.

  According to the present invention, it is possible to provide an in-station apparatus having a redundant configuration and terminating and delivering a signal.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structure of the data delivery system by the 1st Embodiment of this invention. It is a functional block diagram which shows the structure of OLT by the embodiment. It is a functional block diagram which shows the structure of the light transmission part by 2nd Embodiment. It is a functional block diagram which shows the structure of the light transmission part by 3rd Embodiment. It is a functional block diagram showing the composition of the optical amplification / distribution part by a 4th embodiment. It is a functional block diagram showing composition of an optical amplification / distribution part by a 5th embodiment. It is a functional block diagram which shows the structure of the optical amplification / distribution part group by 6th Embodiment. It is a functional block diagram which shows the structure of the optical amplification / distribution part group by 7th Embodiment. It is a functional block diagram which shows the structure of the light transmission part by 8th Embodiment. It is a functional block diagram showing the composition of the optical amplification / distribution part by the embodiment. It is a functional block diagram showing the composition of the optical amplification / distribution part by the embodiment. It is a block diagram of OLT by a prior art.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
An embodiment of the present invention is a PON (Passive Optical Network) system in which an OLT (Optical Line Terminal) as an accommodation station apparatus and a plurality of ONUs (Optical Network Units) as user home apparatuses are connected via an optical splitter. The present invention is applied to an optical signal distribution system that is used as an access network, amplifies an optical signal by an optical amplifier that the OLT has, and efficiently distributes data such as video content.

First Embodiment
FIG. 1 is a diagram showing an entire configuration of a data distribution system 1 of the present embodiment. The data distribution system 1 is, for example, an optical signal distribution system that distributes data such as video content using an PON system in an access network. The data distribution system 1 includes a representative optical transmission unit 10 and an access network 20 connected by a relay network 11. The access network 20 is a one-to-many star type optical fiber network called PON, and includes an OLT 30, an optical splitter 40, and an ONU 50. The OLT 30 is connected to the plurality of ONUs 50 via the optical splitter 40. Although only one OLT 30 is shown in the figure, the number of OLTs 30 can be arbitrary.

  The representative light transmission unit 10 converts data such as video content into an optical signal. The optical signal converted by the representative light transmission unit 10 is distributed to one or more OLTs 30 via the relay network 11 (upper network). The OLT 30 distributes optical signals received from the representative light transmission unit 10 to a plurality of ONUs 50 via the PON, which is a one-to-many star type optical fiber network (lower network). The L system (L is an integer of 2 or more) is redundant between the representative light transmission unit 10 and each of the OLTs 30. In the following, an example in which redundancy between the system from the representative light transmission unit 10 to each of the OLTs 30 is realized by two systems of 0 system and 1 system (L = 2) will be described.

  FIG. 2 is a functional block diagram showing the configuration of the OLT 30 of the present embodiment, and only functional blocks related to the present embodiment are extracted and shown. The OLT 30 includes an optical transmission unit 310 and one or more stages of optical amplification / distribution units 350. The optical amplification / distribution unit 350 at the i-th stage (i is an integer of 1 or more) is referred to as an optical amplification / distribution unit 350-i.

The optical transmission unit 310 includes a signal termination / selection unit 3101 and an optical signal generation unit 3102.
The signal termination / selection unit 3101 terminates the redundant optical signal in a plurality of systems received via the upper relay network 11. The optical transmission unit 310 may terminate the redundant electrical signal. The signal termination / selection unit 3101 confirms the reception quality of each of the received L optical signal or electric signal, selects a signal of the good reception quality, and sends the selected signal to the optical signal generation unit 3102. Output. An optical power may be adopted as the reception quality used as a basis for the signal termination / selection unit 3101 to select a signal, and a monitoring signal set in advance as a part of the data of the optical signal from the representative optical transmission unit 10 A monitor signal quality such as CNR (Carrier to Noise Ratio) or BER (Bit error rate) may be adopted.

  The optical signal generation unit 3102 receives the signal output from the signal termination / selection unit 3101 and converts the input signal into an optical signal of a format (wavelength, modulation scheme, frame format) to be distributed to the access network 20 (access section). Convert and send.

  The light transmission unit 310 may further include a light distribution unit 3103. The light distribution unit 3103 is, for example, a light splitter. The light distribution unit 3103 branches the light signal input from the light signal generation unit 3102 into a plurality of two or more light signals and outputs the light signal.

  The light amplification / distribution unit 350 includes a light amplification unit 3501 and a light distribution unit 3502. The optical amplification / distribution unit 350-1 receives the optical signal output from the optical transmission unit 310, and the optical amplification / distribution unit 350- (i + 1) outputs the optical signal output from the optical amplification / distribution unit 350-i. Enter

  The optical amplification unit 3501 is an optical fiber amplifier represented by an EDFA (erbium-doped fiber amplifier) or the like. The optical amplification unit 3501 amplifies the optical power of the input optical signal and outputs the amplified optical power to the optical distribution unit 3502.

  The light distribution unit 3502 is, for example, a light splitter. The optical distribution unit 3502 receives the optical signal amplified by the optical amplification unit 3501, branches it into a plurality of optical signals, and outputs the branched optical signal to the optical amplification / distribution unit 350 in the subsequent stage. The optical distribution unit 3502 included in the last stage optical amplification / distribution unit 350 (in the case of two stages as shown in the figure, the optical amplification / distribution unit 350-2) It outputs to the splitter 40.

  By providing a plurality of stages of the optical amplification / distribution unit 350, it is possible to obtain optical signals of many outputs while maintaining a constant signal-to-noise ratio (SNR) of the optical signal.

  The OLT 30 according to the first embodiment shown in FIG. 2 is configured to temporarily terminate an optical signal (or an electrical signal) received through the relay network 11 at the OLT 30 and distribute the optical signal in a format suitable for the access network 20. It is. Even if part of the optical signals of the plurality of systems received from the relay network 11 fails to obtain a certain reception quality in the OLT 30 due to a failure, the signal termination / selection unit 3101 of the optical transmission unit 310 outputs the light to the subsequent stage The service impact can be minimized by switching the signal to an optical signal of a system for which good reception quality is obtained. Therefore, a highly reliable PON system can be realized.

  When the signal termination / selection unit 3101 converts an optical signal of a plurality of systems distributed via the relay network 11 into an electric signal and receives the electric signal, the signal termination / selection unit 3101 relays each system separately. A configuration is also conceivable in which a receiving unit for receiving an optical signal distributed via the network 11 is provided, and each receiving unit is provided with a memory for delay difference adjustment of each system. If the signal to be transmitted is in a packet-based form, by providing the memory in the reception unit, switching in the signal termination / selection unit 3101 can be performed without packet loss and without interruption.

Second Embodiment
In the first embodiment, the optical transmission unit 310 included in the OLT 30 includes only one optical signal generation unit 3102. The optical transmission unit of the present embodiment includes a plurality of optical signal generation units and is made redundant.

  The configuration of the optical signal distribution system of this embodiment is the same as that of the data distribution system 1 of the first embodiment shown in FIG. However, the OLT 30 has a configuration in which an optical transmission unit 311 shown in FIG. 3 is provided in place of the optical transmission unit 310 shown in FIG.

  FIG. 3 is a functional block diagram showing the configuration of the light transmission unit 311 according to the present embodiment, and only the functional blocks related to the present embodiment are extracted and shown. In the figure, the same parts as those of the light transmitting unit 310 included in the OLT 30 according to the first embodiment shown in FIG.

  The light transmission unit 311 includes L (L is an integer of 2 or more) signal termination units 3111, L light signal generation units 3112, an optical switch 3113, a monitoring light distribution unit 3114, and light monitoring / switching. And a control unit 3115. Here, L = 2, and the two signal termination units 3111 are respectively described as signal termination units 3111-1 and 3111-2, and the two optical signal generation units 3112 are respectively optical signal generation units 3112-1. , 3112-2. The light transmission unit 311 may further include a light distribution unit 3103.

  The optical signals redundantly arranged in the L system received via the relay network 11 are converted into optical signals of a format to be distributed to the access network 20 by the signal termination unit 3111 and the optical signal generation unit 3112 of each system. That is, the signal termination unit 3111-1 terminates an optical signal or an electrical signal of the l-th system (I is an integer greater than or equal to 1 and less than or equal to L). The optical signal generation unit 3112-1 receives the signal terminated by the signal termination unit 3111-1, and delivers the signal of the format (wavelength, modulation scheme, frame format) to be delivered to the access network 20 (access section) It is converted into a signal and output to the optical switch 3113.

  The optical switch 3113 outputs one of the plurality of optical signals input from each of the optical signal generation units 3112-1 and 3112-2 based on the result of monitoring a part of the output optical signal of the optical switch 3113. Select an optical signal. The light monitor / switching control unit 3115 performs this monitoring and control. The optical switch 3113 outputs the selected optical signal to the monitoring light distribution unit 3114.

  The monitor optical distribution unit 3114 branches a part of the power of the optical signal input from the optical switch 3113. The monitor light distribution unit 3114 outputs the power of the branched light signal to the light monitor / switching control unit 3115, and outputs the remaining branched light signal to the subsequent stage. Specifically, when the light transmission unit 311 includes the light distribution unit 3103, the monitor light distribution unit 3114 outputs the power of the branched light signal to the light monitor / switching control unit 3115, and the remaining light signal is lighted. It is output to the distribution unit 3103. When the light transmission unit 311 does not include the light distribution unit 3103, the monitor light distribution unit 3114 outputs the power of the branched light signal to the light monitor / switching control unit 3115, and the remaining light signal is light amplification / distribution unit Output to 350-1.

  The light monitor / switch control unit 3115 monitors the light signal input from the monitor light distribution unit 3114. As the quality to be monitored, optical power may be adopted, or monitor signal quality such as CNR or BER of a monitor signal included in a part of data of the optical signal may be adopted. The optical monitor / switching control unit 3115 controls the selection of the optical signal in the optical switch 3113 based on the monitored result.

  According to this embodiment, since the optical signal generation unit 3112 which is an active component is also made redundant, a PON system with higher reliability can be realized as compared with the configuration of the first embodiment shown in FIG.

Third Embodiment
The present embodiment shows a configuration different from that of the second embodiment with regard to the redundancy of the light signal generation unit in the light transmission unit in the OLT 30.

  The configuration of the optical signal distribution system of this embodiment is the same as that of the data distribution system 1 of the first embodiment shown in FIG. However, the OLT 30 has a configuration in which an optical transmission unit 312 shown in FIG. 4 is provided instead of the optical transmission unit 310 shown in FIG.

  FIG. 4 is a functional block diagram showing a configuration of the optical transmission unit 312 according to the present embodiment, and only functional blocks related to the present embodiment are extracted and shown. In the figure, the same parts as those of the light transmission unit 310 included in the OLT 30 according to the first embodiment shown in FIG. 2 and the light transmission unit 311 according to the second embodiment shown in FIG. I omit explanation.

  The optical transmission unit 312 includes a signal termination / selection unit 3101, a signal distribution unit 3121, K (K is an integer of 2 or more) optical signal generation units 3122, an optical switch 3113, and a monitoring light distribution unit 3114. And an optical monitor / switching control unit 3115. The k-th (k is an integer greater than or equal to 1 and less than or equal to K) optical signal generator 3122 is referred to as an optical signal generator 3122-k. Here, it is assumed that K = 2 and the two optical signal generators 3122 are described as optical signal generators 3122-1 and 3122-2, respectively. The light transmission unit 311 may further include a light distribution unit 3103.

  As in the first embodiment, among the optical signals or electric signals redundantly arranged in the L system (L is an integer of 2 or more) received by the single signal termination / selection unit 3101 via the relay network 11. , Select an optical signal or an electrical signal of good reception quality. The signal termination / selection unit 3101 outputs the selected signal to the signal distribution unit 3121.

  The signal distribution unit 3121 is an optical splitter, an electrical signal splitter, or the like. The signal distribution unit 3121 distributes the optical signal or the electric signal input from the signal termination / selection unit 3101 to a plurality of outputs, and outputs each of the signals to K optical signal generation units 3122-1 to 3122-K.

  The operation of the subsequent stages from the optical signal generation units 3122-1 to 3122-K is the same as the operation of the subsequent stages from the optical signal generation unit 3112 in the second embodiment. That is, each of the optical signal generation units 3122-1 to 3122-K converts the input signal into an optical signal of a format to be distributed to the access network 20 (access section), and outputs the optical signal to the optical switch 3113. The optical switch 3113 outputs one of the plurality of optical signals input from the optical signal generation units 3122-1 to 3122-K based on the monitoring result of a part of the output optical signal by the optical monitor / switching control unit 3115. Select one light signal. The monitor optical distribution unit 3114 branches a part of the power of the optical signal selected by the optical switch 3113, outputs the branched optical signal to the optical monitor / switching control unit 3115, and distributes the branched remaining optical signal The signal is output to the unit 3103 or the light amplification / distribution unit 350-1.

  According to the present embodiment, as in the configuration of the second embodiment shown in FIG. 3, while the optical signal generation unit which is the active component is also made redundant, the termination unit of the optical signal received through the relay network is single. As compared with the configuration of the second embodiment shown in FIG. 3, the PON system having a simple configuration can be realized.

Fourth Embodiment
In the first embodiment, each optical amplification / distribution unit 350 in the OLT 30 includes only one optical amplification unit 3501. The optical amplification / distribution unit of this embodiment includes a plurality of optical amplification units and is made redundant.

  The configuration of the optical signal distribution system of this embodiment is the same as that of the data distribution system 1 of the first embodiment shown in FIG. However, the OLT 30 has a configuration in which an optical amplification / distribution unit 351 shown in FIG. 5 is provided instead of the optical amplification / distribution unit 350 of each stage shown in FIG.

  FIG. 5 is a functional block diagram showing the configuration of the optical amplification / distribution unit 351 according to the present embodiment, and only the functional blocks related to the present embodiment are extracted and shown. In the figure, the same parts as those of the optical amplification / distribution unit 350 provided in the OLT 30 of the first embodiment shown in FIG.

  The optical amplification / distribution unit 351 includes an optical distribution unit 3511, K (K is an integer of 2 or more) optical amplification units 3512, an optical switch 3513, a monitoring optical distribution unit 3514, and an optical monitor / switching control unit 3515 and a light distribution unit 3502. The k-th (k is an integer of 1 or more and K or less) light amplification portion 3512 is referred to as a light amplification portion 3512-k. Here, K = 2 and two light amplification units 3512 are described as light amplification units 3512-1 and 3512-2, respectively.

  The light distribution unit 3511 is a light splitter or the like. The optical distribution unit 3511 distributes the optical signal input from the optical transmission unit 310 of the preceding stage or the optical amplification / distribution unit 351 of the preceding stage to a plurality of outputs, and the distributed optical signals are respectively amplified by the optical amplification units 3512-1 to 3512. Output to -K. Each of the optical amplification units 3512-1 to 3512-K amplifies the optical power of the optical signal input from the optical distribution unit 3511, and outputs the optical power to the optical switch 3513.

  The configuration of the subsequent stages from the optical amplification units 3512-1 to 3512-K is the same as the operation of the subsequent stages from the optical signal generation unit 3112 in the light transmission unit 311 of the second embodiment. That is, the optical switch 3513 selects one of the plurality of optical signals input from each of the optical amplification units 3512-1 to 3512-K based on the monitoring result of a part of the output optical signal by the optical monitoring / switching control unit 3515. Select one optical signal to output. The monitor optical distribution unit 3514 branches a part of the power of the optical signal selected by the optical switch 3513, outputs the branched optical signal to the optical monitor / switching control unit 3515, and distributes the branched remaining optical signal Output to the part 3502. The optical monitor / switching control unit 3515 monitors the optical signal input from the monitoring light distribution unit 3514, and controls the selection of the optical signal in the optical switch 3513 based on the monitoring result. The light distribution unit 3502 branches the light signal input from the monitoring light distribution unit 3514 into a plurality of light signals and outputs the light signals to the subsequent stage.

  According to this embodiment, since the optical amplification unit 3512 which is an active component is made redundant, a PON system with higher reliability can be realized as compared with the configuration shown in FIG.

Fifth Embodiment
The present embodiment shows a configuration different from that of the fourth embodiment in the redundancy of the optical amplification unit in the optical amplification / distribution unit in the OLT 30.

  The configuration of the optical signal distribution system of this embodiment is the same as that of the data distribution system 1 of the first embodiment shown in FIG. However, the OLT 30 has a configuration in which an optical amplification / distribution unit 352 shown in FIG. 6 is provided instead of the optical amplification / distribution unit 350 of each stage shown in FIG.

  FIG. 6 is a functional block diagram showing the configuration of the light amplification / distribution unit 352 according to the present embodiment, and only the functional blocks related to the present embodiment are extracted and shown. In the figure, the same parts as those of the light amplification / distribution unit 351 of the fourth embodiment shown in FIG.

  The light amplification / distribution unit 352 includes a light distribution unit 3511, K (K is an integer of 2 or more) light amplification units 3512, K light distribution units 3521, and J (J is an integer of 2 or more) And a monitor light distribution unit 3523 for monitor, and J light monitor / switching control units 3524. Here, K = 2 and the k-th (k is an integer of 1 or more and K or less) light amplification unit 3512 and light distribution unit 3521 are described as a light amplification unit 3512-k and a light distribution unit 3521-k, respectively. In addition, the j-th (j is an integer of 1 or more and J or less) optical switch 3522, monitoring light distribution unit 3523, and optical monitor / switching control unit 3524, the optical switch 3522-j and monitoring light distribution unit 3523-j, respectively. And an optical monitor / switching control unit 3524-j.

  The optical distribution unit 3511 distributes the optical signal input from the optical transmission unit 310 of the preceding stage or the optical amplification / distribution unit 352 of the preceding stage to K outputs, and the distributed optical signals are respectively amplified by the optical amplification unit 3512-1 Output to ~ 3512-K. Each of the optical amplification units 3512-1 to 3512-K amplifies the optical power of the optical signal input from the optical distribution unit 3511. The optical amplification unit 3512-k (k is an integer of 1 or more and K or less) outputs the amplified optical signal to the light distribution unit 3521-k. Each of the optical distribution units 3521-1 to 3521-K distributes the input optical signal and outputs the distributed optical signal to the J optical switches 3522.

  The operation after each optical switch 3522 is the same as that of the second embodiment. That is, the optical switch 3522-j (j is an integer of 1 or more and J or less) is selected based on the result of monitoring the power of a part of the output optical signal from the optical monitor / switching control unit 3524-j. Among the plurality of optical signals input from 1 to 3521-K, one optical signal to be output is selected. The monitor optical distribution unit 3523-j branches a part of the power of the optical signal selected by the optical switch 3522-j, outputs the branched optical signal to the optical monitor / switching control unit 3524-j, and the remaining branched Is output to the optical amplification / distribution unit 352 or the optical splitter 40 in the subsequent stage. The optical monitor / switching control unit 3524-j monitors the optical signal input from the monitoring light distribution unit 3523-j, and controls the selection of the optical signal in the optical switch 3522-j based on the monitoring result.

  According to the present embodiment, as in the configuration of the fourth embodiment shown in FIG. 5, while making the optical amplification unit which is an active component redundant, an optical switch is installed in each of a plurality of optical signals output to the subsequent stage. Therefore, compared with the configuration of the fourth embodiment shown in FIG. 5, the influence range at the time of the optical switch failure can be limited.

Sixth Embodiment
In the present embodiment, the optical amplification / distribution units of each stage in the OLT 30 have an M: N redundancy configuration of the optical amplification units.

  The configuration of the optical signal distribution system of this embodiment is the same as that of the data distribution system 1 of the first embodiment shown in FIG. However, the OLT 30 is provided with the optical amplification / distribution group 353 shown in FIG. 7 in place of the plurality of optical amplification / distribution units 350-i in the i-th stage (i = 1, 2,...) Shown in FIG. It is a structure.

  FIG. 7 is a functional block diagram showing the configuration of the optical amplification / distribution unit group 353 according to the present embodiment, and only the functional blocks related to the present embodiment are extracted and shown. The optical amplification / distribution unit group 353 shown in the figure includes (M + N) optical amplification units 3531, an optical switch 3532, M monitoring light distribution units 3533, an optical monitor / switching control unit 3534, and M And a plurality of light distribution units 3535. M is an integer of 2 or more, N is an integer of 1 or more, but in the figure, the case of N = 1 is shown. Further, in the figure, portions corresponding to the respective optical amplification / distribution units to be operated are indicated by broken lines. In the following description, the m-th light amplification unit 3531, the monitoring light distribution unit 3533, and the light distribution unit 3535 are respectively described as the light amplification unit 3531-m, the monitoring light distribution unit 3533-m, and the light distribution unit 3535-m. Do.

  The plurality of (M + N) optical signals input from the previous stage are input to (M + N) optical amplification units 3531-1 to 3531-(M + N), respectively. These (M + N) optical amplification units 3531-1 to 3531- (M + N) are divided into M, which are normally used at present, and N, which are spares (N = 1 in FIG. 7). In the case of the first stage optical amplification / distribution unit group 353, the former stage is the optical transmission unit 310, and in the case of the second stage and subsequent optical amplification / distribution group 353, the former stage is optical amplification / distribution one hierarchy higher It is a group 353. The optical signals amplified by the (M + N) optical amplification units 3531-1 to 3531-(M + N) are output to a single optical switch 3532.

  The optical switch 3532 outputs the optical signals input from the M current optical amplification units 3531 to the monitoring light distribution units 3533-1 to 3533-M. Further, the optical switch 3532 inputs an optical signal input from the spare N optical amplification units 3531 to the optical monitor / switching control unit 3534.

  The monitor optical distribution units 3533-1 to 3533-M respectively branch a part of the optical power of the input optical signal, input the branched optical signal to the optical monitor / switching control unit 3534, and branch the remaining light The signal is input to the light distribution units 3535-1 to 3535-M.

  The optical monitor / switching control unit 3534 receives the outputs of the M current monitor light distributing units 3533 and the outputs of the N spare optical amplification units 3531 and monitors the reception quality. The optical monitor / switching control unit 3534 constantly monitors the quality of these M + N optical signals. The reception quality is, for example, optical power or monitor signal quality (CNR / BER). The optical monitor / switching control unit 3534 controls the optical switch 3532 when it detects that a part of the M optical signals in operation has fallen below a certain reception quality due to a fault based on the monitor result. The optical switch 3532 controls the optical signal output from the optical amplification unit 3531 of the system whose reception quality is lower than that of the optical system in which the reception quality is excellent among the N spare optical signals. It switches to the light signal output from the amplification unit 3531 and outputs it to the monitoring light distribution unit 3533.

  Although FIG. 5 and FIG. 6 show the 1: N redundant configuration of the optical amplification unit, considering the failure rate of the optical amplification unit in practical use, the number of spare optical amplification units is large and the over-spec configuration There is also the possibility of On the other hand, according to the present embodiment, the number of spare optical amplification units 3531 is reduced compared to the configurations shown in FIG. 5 and FIG. 6, and an economical PON system can be realized.

Seventh Embodiment
The present embodiment shows a configuration different from that of the sixth embodiment with regard to M: N redundancy of the optical amplification units in the optical amplification / distribution units of each stage in the OLT 30. In the sixth embodiment, a single optical switch 3532 is used, while in the present embodiment, a plurality of output optical signals from optical amplification / distribution are handled in the same manner as in the fifth embodiment. The optical switch of

  The configuration of the optical signal distribution system of this embodiment is the same as that of the data distribution system 1 of the first embodiment shown in FIG. However, the OLT 30 has a configuration in which an optical amplification / distribution group 354 shown in FIG. 8 is provided in place of the plurality of optical amplification / distribution units 350 in the i-th stage (i = 1, 2,...) Shown in FIG. is there.

  FIG. 8 is a functional block diagram showing the configuration of the optical amplification / distribution unit group 354 according to the present embodiment, and only the functional blocks related to the present embodiment are extracted and shown. In the figure, the same parts as those of the optical amplification / distribution unit group 353 according to the sixth embodiment shown in FIG. The optical amplification / distribution unit group 354 shown in the figure includes (M + N) optical amplification units 3531, (M + N) optical distribution units 3541, M optical switches 3542, and M monitoring light distributions. A unit 3543 and an optical monitor / switching control unit 3544 are provided. M is an integer of 2 or more, N is an integer of 1 or more, but in the figure, the case of N = 1 is shown. Further, in the figure, portions corresponding to the respective optical amplification / distribution units to be operated are indicated by broken lines. The m-th light amplification unit 3531, the light distribution unit 3541, the light switch 3542, and the monitoring light distribution unit 3543 are respectively the light amplification unit 3531-m, the light distribution unit 3541-m, the light switch 3542-m, and the monitoring light It describes as the distribution part 3543-m.

  The plurality of (M + N) optical signals input from the previous stage are input to (M + N) optical amplification units 3531-1 to 3531-(M + N), respectively. The (M + N) optical amplification units 3531-1 to 3531- (M + N) are divided into M, which are normally used at present, and N, which are spares (here, N = 1). In the case of the first stage optical amplification / distribution unit group 354, the former stage is the optical transmission unit 310, and in the case of the second stage and subsequent optical amplification / distribution group 354, the former stage is optical amplification / distribution one hierarchy higher It is a group 354. The outputs of the light amplification units 3531-m (m is an integer of 1 or more and M + N or less) are output to the light distribution units 3541-m.

  The M current light distribution units 3541-m (m is an integer of 1 or more and M or less) output the optical signal input from the optical amplification unit 3531-m to the optical switch 3542-m. In addition, the N spare light distribution units 3541-m ′ (m ′ is an integer between M + 1 and M + N) include the optical switches 3542-1 to 3542-M that are input from the optical amplification units 3531-m ′. And the light monitor / switching control unit 3544.

  Each of the optical switches 3542-m (m is an integer of 1 or more and M or less) is one optical signal input from the light distribution unit 3541-m according to the monitoring result and control by the light monitoring / switching control unit 3544 and the light distribution unit Among the optical signals input one by one from each of 3541-m '(m' is an integer from M + 1 to M + N), the optical signal input from the optical distribution unit 3541 of the system where good reception quality is obtained is selected Do. The optical switch 3542-m (m is an integer of 1 or more and M or less) inputs the selected optical signal to the monitoring light distribution unit 3543-m.

  The monitor optical distribution unit 3543-m (m is an integer of 1 or more and M or less) branches a part of the optical power of the optical signal input from the optical switch 3542-m, and the branched remaining optical signal is output to the subsequent stage The signal is output to the amplification / distribution unit group 354 or the optical splitter 40. The monitor light distribution units 3543-1 to 3543 -M input the branched light powers to the light monitor / switching control unit 3544.

  The light monitor / switching control unit 3544 receives the outputs of the monitor light distribution units 3543-1 to 3543 -M and the outputs of the spare N light distribution units 3541, and monitors the reception quality. The optical monitor / switching control unit 3544 constantly monitors the quality of these (M + N) optical signals. The reception quality is, for example, optical power or monitor signal quality (CNR / BER). When the optical monitor / switching control unit 3544 detects that part of the M optical signals in operation has fallen below a certain reception quality due to a failure based on the monitoring result, the optical switch 3542-m ( m is an integer greater than or equal to 1 and less than or equal to M), the optical signal output from the light distribution unit 3541 of the operation system lower than the reception quality can be received with good reception quality among the N optical signals of the backup system It switches to the light signal output from the light distribution unit 3541 of the existing system, and outputs the light signal to the monitor light distribution unit 3543-m. The light distribution unit 3541-m, which has become a standby system from the operation system, operates in the same manner as the light distribution unit 3541-m 'of the standby system described above, and the light distribution unit 3541-m' that has become an operation system from the standby system. It operates in the same manner as the light distribution unit 3541-m of the operation system described above.

  According to the present embodiment, as in the configuration of the sixth embodiment shown in FIG. 7, while realizing M: N redundancy of the optical amplification unit which is an active component, for each of a plurality of optical signals output to the subsequent stage Since the optical switch is installed, the influence range at the time of the optical switch failure can be limited as compared with the configuration of the sixth embodiment shown in FIG.

Eighth Embodiment
In the second to seventh embodiments, the light distribution unit that distributes a plurality of outputs toward the subsequent stage and the monitoring light distribution unit that distributes the light signal to be monitored are configured by different components. In the present embodiment, the light distribution unit also serves as a monitor light distribution unit.

  The configuration of the optical signal distribution system of this embodiment is the same as that of the data distribution system 1 of the first embodiment shown in FIG. However, the OLT 30 has a configuration in which an optical transmission unit 313 shown in FIG. 9 is provided instead of the optical transmission unit 310 shown in FIG. Alternatively, the OLT 30 has a configuration in which the optical amplification / distribution unit 355 shown in FIG. 10 or the optical amplification / distribution unit 356 shown in FIG. 11 is provided instead of the optical amplification / distribution unit 350 of each stage shown in FIG.

  FIG. 9 is a functional block diagram showing the configuration of the optical transmission unit 313 of the present embodiment, and shows only the functional blocks related to the present embodiment. In the figure, the same parts as those of the light transmission unit 313 according to the third embodiment shown in FIG. The light transmission unit 313 shows a configuration in the case where the light distribution unit also has a role of a monitoring light distribution unit based on the configuration of the light transmission unit 312 of the third embodiment.

  The optical transmission unit 313 includes a signal termination / selection unit 3101, a signal distribution unit 3121, K (K is an integer of 2 or more) optical signal generation units 3122, an optical switch 3113, an optical distribution unit 3131, light And a monitor / switch control unit 3132. Here, it is assumed that K = 2 and the k-th (k is an integer of 1 or more and K or less) optical signal generation unit 3122 is described as an optical signal generation unit 3122-k.

  The operation from the signal termination / selection unit 3101 to the optical switch 3113 is the same as that of the third embodiment. The optical distribution unit 3131 distributes the optical signal input from the optical switch 3113 to the first stage optical amplification / distribution unit 350-1 and the optical monitor / switching control unit 3132 for output. The light monitor / switching control unit 3132 monitors the quality of the light signal input from the light distribution unit 3131 and controls selection of the light signal in the light switch 3113 based on the monitored result.

  FIG. 10 is a functional block diagram showing the configuration of the optical amplification / distribution unit 355 of the present embodiment, and shows only the functional blocks related to the present embodiment. In the figure, the same parts as those of the light amplification / distribution unit 351 according to the fourth embodiment shown in FIG. The light amplification / distribution unit 355 shows a configuration in the case where the light distribution unit also has a role of a monitor light distribution unit based on the configuration of the light amplification / distribution unit 351 of the fourth embodiment.

  The optical amplification / distribution unit 355 includes an optical distribution unit 3511, K optical amplification units 3512, an optical switch 3513, an optical distribution unit 3551, and an optical monitor / switching control unit 3552. Here, K = 2 and the k-th (k is an integer of 1 or more and K or less) light amplification unit 3512 is described as a light amplification unit 3512-k.

  The operation from the light distribution unit 3511 to the light switch 3513 is the same as that of the fourth embodiment. The optical distribution unit 3551 distributes and inputs the optical signal input from the optical switch 3513 to the optical amplification / distribution unit 355 and the optical monitor / switching control unit 3552 in the subsequent stage. The optical monitor / switching control unit 3552 monitors the quality of the optical signal input from the optical distribution unit 3551, and controls the selection of the optical signal in the optical switch 3513 based on the monitoring result.

  FIG. 11 is a functional block diagram showing the configuration of the light amplification / distribution unit 356 of the present embodiment, and only the functional blocks related to the present embodiment are extracted and shown. In the figure, the same parts as those of the light amplification / distribution unit 352 according to the fifth embodiment shown in FIG. The light amplification / distribution unit 355 shows a configuration in the case where the light distribution unit also serves as a monitoring light distribution unit based on the configuration of the light amplification / distribution unit 352 of the fifth embodiment.

  The optical amplification / distribution unit 356 includes an optical distribution unit 3511, K (K is an integer of 2 or more) optical amplification units 3512, K optical distribution units 3561, an optical monitor / switching control unit 3562, J And (where J is an integer of 2 or more) optical switches 3563. Here, it is assumed that K = 2, and the k-th light amplification unit 3512 and the light distribution unit 3561 are described as a light amplification unit 3512-k and a light distribution unit 3561-k, respectively. In addition, the j-th (j is an integer of 1 or more and J or less) optical switch 3563 is described as an optical switch 3563-j.

  The operation from the light distribution unit 3511 to the light amplification unit 3512 is the same as that of the fifth embodiment. The optical distribution unit 3561-k distributes and outputs the optical signal input from the optical amplification unit 3512-k to the J optical switches 3563 and the optical monitor / switching control unit 3562. Among the optical signals input from each of the optical distribution units 3561-1 to 3561-K, the J optical switches 3563 can select the optical signal selected based on the monitoring result of the optical signal by the optical monitor / switching control unit 3562 in the subsequent stage. Output to the optical amplification / distribution unit 356 or the optical splitter 40. The optical monitor / switching control unit 3562 monitors the quality of the optical signals input from the optical distribution units 3561-1 to 3561 -K, and controls the selection of optical signals in the J optical switches 3563 based on the monitoring result.

  Note that the light transmission unit 311 of the second embodiment shown in FIG. 3, the light amplification / distribution unit group 353 of the sixth embodiment shown in FIG. 7, the light amplification / distribution unit of the seventh embodiment shown in FIG. 8. Also in the group 354, the same embodiment can be obtained by connecting one output of the “light distribution unit” to the “light monitor / switching control unit”.

  According to this embodiment, since the number of component parts of the OLT is reduced, it is possible to realize a PON system having a simple configuration as compared with the configurations shown in FIGS.

Ninth Embodiment
In the second to eighth embodiments, the redundant configuration of either the optical signal generation unit in the optical transmission unit or the optical amplification unit of optical amplification / distribution in each stage is shown, but any of these may be used. The redundant configurations of the above may be combined in any combination and provided simultaneously.
With such a configuration, even if active component failures occur at multiple locations, the service impact can be minimized, and a highly reliable PON system can be realized.

  According to the embodiment described above, the accommodating station apparatus (for example, the OLT 30) performs amplification and branching of the optical signal, and an optical transmission unit (for example, the optical transmission unit 310) which outputs the optical signal generated from the received signal. And one or more hierarchical optical amplification / distribution units (for example, optical amplification / distribution unit 350).

  The optical transmission unit includes a signal termination selection unit (for example, signal termination / selection unit 3101), an optical signal generation unit (for example, optical signal generation unit 3102), and an optical transmission unit side light distribution unit (for example, light distribution unit 3103). And. The signal termination selection unit terminates the plurality of redundant signals received from the upper network and outputs a signal selected based on the reception quality among the terminated signals. The optical signal generation unit generates an optical signal of a signal format used for a lower network from the signal output from the signal termination selection unit and outputs the optical signal. The light transmission unit side light distribution unit distributes the light signal output from the light signal generation unit to one or more and outputs the light signal.

  The light amplification and distribution unit includes a light amplification unit (for example, a light amplification unit 3501) and a light amplification and distribution unit-side light distribution unit (for example, a light distribution unit 3502). The optical amplification unit inputs one optical signal output from the optical transmission unit or another optical amplification and distribution unit in the previous stage, amplifies the optical power, and outputs the amplified optical power. The light amplification and distribution unit side light distribution unit divides and outputs a plurality of light signals output from the light amplification unit. The optical amplification and distribution unit side optical distribution unit included in the final stage optical amplification and distribution unit sends out the distributed optical signal to the lower network.

  The accommodation station apparatus may include an optical transmission unit (for example, an optical transmission unit 311) having the following configuration. That is, the optical transmission unit includes a plurality of signal termination units (for example, signal termination unit 3111), a plurality of optical signal generation units (for example, optical signal generation unit 3112), an optical switch (for example, 3113), and monitoring A light distribution unit (for example, a monitor light distribution unit 3114), a control unit (for example, a light monitor / switching control unit 3115), and a light distribution unit (for example, a light distribution unit 3103). The plurality of signal termination units respectively terminate the plurality of redundant signals received from the upper network. The plurality of optical signal generation units generate and output optical signals of a signal format used for the lower network from the signal terminated by the corresponding signal termination unit. The optical switch outputs one optical signal selected from the optical signals output from the plurality of optical signal generation units. The monitor light distribution unit distributes the light power of a part of the light signal output from the light switch. The control unit controls selection of an optical signal by the optical switch based on information obtained as a result of monitoring one of the optical signals distributed by the monitoring light distribution unit. The light distribution unit distributes the other light signal distributed by the monitoring light distribution unit to one or more and outputs it.

  Also, the accommodation station apparatus may include an optical transmission unit (for example, an optical transmission unit 312) having the following configuration. That is, the optical transmission unit includes a signal termination selection unit (for example, signal termination / selection unit 3101), a signal distribution unit (for example, signal distribution unit 3121), and a plurality of optical signal generation units (for example, optical signal generation unit 3122). ), An optical switch (for example, optical switch 3113), a monitor light distribution unit (for example, monitor light distribution unit 3114), a control unit (for example, optical monitor / switching control unit 3115), and a light distribution unit (for example For example, the light distribution unit 3103) is provided. The signal termination selection unit terminates the plurality of redundant signals received from the upper network and outputs a signal selected based on the reception quality among the terminated signals. The signal distribution unit distributes the signal output from the signal termination selection unit into a plurality of signals and outputs the signal. The plurality of optical signal generation units respectively input the plurality of signals output from the signal distribution unit, and generate and output optical signals of a signal format used for a lower network from the input signals. The optical switch outputs one optical signal selected from the optical signals output from each of the plurality of optical signal generation units. The monitor light distribution unit distributes the light power of a part of the light signal output from the light switch. The control unit controls selection of an optical signal by the optical switch based on information obtained as a result of monitoring one of the optical signals distributed by the monitoring light distribution unit. The light distribution unit distributes the other light signal distributed by the monitoring light distribution unit to one or more and outputs it.

  Also, the accommodating station apparatus may include an optical amplification and distribution unit (for example, an optical amplification / distribution unit 351) having the following configuration. That is, the light amplification and distribution unit includes an input light distribution unit (for example, light distribution unit 3511), a plurality of light amplification units (for example, light amplification unit 3512), a light switch (for example, light switch 3513), and monitoring A light distribution unit (for example, a monitor light distribution unit 3514), a control unit (for example, a light monitor / switching control unit 3515), and a light distribution unit (for example, a light distribution unit 3502). The input light distribution unit inputs one light signal output from the light transmission unit or another light amplification and distribution unit at the previous stage, distributes the light signal to a plurality, and outputs the light signal. The plurality of optical amplification units receive each of the plurality of optical signals output from the input light distribution unit, amplify the optical power, and output the amplified optical power. The optical switch outputs one optical signal selected from the optical signals output from each of the plurality of optical amplification units. The monitor light distribution unit distributes the light power of a part of the light signal output from the light switch. The control unit controls selection of an optical signal by the optical switch based on information obtained as a result of monitoring one of the optical signals distributed by the monitoring light distribution unit. The light distribution unit distributes the other light signal distributed by the monitoring light distribution unit to one or more and outputs it. The optical distribution unit included in the final stage optical amplification and distribution unit sends the distributed optical signal to the lower network.

  Also, the accommodating station apparatus may include an optical amplification distribution unit (for example, an optical amplification / distribution unit 352) having the following configuration. That is, the light amplification and distribution unit includes an input light distribution unit (for example, light distribution unit 3511), a plurality of light amplification units (for example, light amplification unit 3512), and a plurality of light distribution units (for example, light distribution unit 3521) A plurality of optical switches (for example, optical switch 3522), a plurality of monitoring light distribution units (for example, monitoring light distribution unit 3523), and a plurality of control units (for example, optical monitoring / switching control unit 3524) Have. The input light distribution unit inputs one of the light signals output from the light transmission unit or another light amplification and distribution unit at the previous stage, distributes the light signal into a plurality of light signals, and outputs the light signal. The plurality of optical amplification units receive each of the plurality of optical signals output from the light distribution unit, amplify the optical power, and output the amplified optical power. The plurality of optical distribution units receive the optical signal output from the corresponding optical amplification unit, and divide and output the optical signal. The plurality of optical switches output one optical signal selected from the optical signals output from each of the plurality of optical distribution units. The plurality of monitoring light distribution units distribute a part of optical power of the optical signal output from the corresponding optical switch. The plurality of control units control selection of optical signals by the corresponding optical switch based on information obtained as a result of monitoring one of the optical signals distributed by the corresponding monitor light distribution unit. The monitoring light distribution unit included in the last stage optical amplification distribution unit transmits the other light signal to the lower network.

  In addition, the accommodating station apparatus may include an optical amplification and distribution unit (for example, an optical amplification / distribution unit group 353) having the following configuration. That is, the light amplification distribution unit includes a plurality of light amplification units (for example, light amplification unit 3531), an optical switch (for example, light switch 3532), and a plurality of monitoring light distribution units (for example, monitoring light distribution unit 3533). ), A control unit (for example, light monitor / switching control unit 3534), and a plurality of light distribution units (for example, light distribution unit 3535). The plurality of optical amplification units receive each of the plurality of optical signals output from the optical transmission unit or the previous stage optical amplification and distribution unit, and amplify the optical power of the input optical signal. The optical switch outputs optical signals of a plurality of operation systems selected from optical signals output from the plurality of optical amplification units and optical signals of one or more spare systems. The monitor optical distribution unit inputs each of the plurality of operation system optical signals output from the optical switch, and distributes the optical power of a part of the input optical signal. The control unit monitors an optical signal of the operation system by the optical switch based on information obtained as a result of monitoring the optical signal of the spare system output from the optical switch and one of the optical signals distributed by the plurality of monitoring light distribution units. Control the selection of The plurality of light distribution units distribute the other light signal output from the corresponding monitor light distribution unit to one or more outputs. The plurality of optical distribution units included in the final stage optical amplification and distribution unit transmit the distributed optical signal to the lower network.

  Also, the accommodating station apparatus may include an optical amplification and distribution unit (for example, an optical amplification / distribution unit group 354) having the following configuration. That is, the light amplification and distribution unit includes a plurality of light amplification units (for example, light amplification unit 3531), a plurality of light distribution units (for example, light distribution unit 3541), and a plurality of light switches (for example, light switch 3542) And a plurality of monitoring light distribution units (for example, monitoring light distribution unit 3543) and a control unit (for example, light monitoring / switching control unit 3544). The plurality of optical amplification units receive one optical signal output from the optical transmission unit or another optical amplification and distribution unit at the previous stage, and amplify the optical power of the input optical signal. The plurality of optical distribution units distribute and output the optical signal output from the corresponding optical amplification unit. The plurality of optical switches are one optical signal selected from one of a plurality of optical signals distributed by the corresponding optical distribution unit of the operation system and one of a plurality of optical signals distributed by the optical distribution unit of the backup system. Output The plurality of monitoring light distribution units distribute a part of optical power of the optical signal output from the corresponding optical switch. The control unit is configured to monitor the plurality of optical signals distributed by each of the plurality of monitoring light distribution units and the information obtained as a result of monitoring one of the optical signals output from the spare system light distribution unit. Control the selection of the optical signal by the optical switch. The monitoring light distribution unit included in the last stage optical amplification distribution unit transmits the other light signal to the lower network.

  In the accommodation station apparatus, the light distribution unit may have the function of the monitor light distribution unit.

  According to the embodiment described above, in the optical signal distribution system for efficiently distributing video content and the like, the OLT internal apparatus can be made redundant, and a system with excellent reliability can be provided. Become.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Data distribution system 10 ... Representative optical transmission part 11 ... Relay network 20 ... Access network 30 ... OLT
40: Optical splitter 50: ONU
310, 311, 312, 313 Optical transmission units 350-1, 350-2, 351, 352, 355, 356 Optical amplification / distribution units 353, 354 Optical amplification / distribution group 3101 Signal termination / selection unit 3102 ... Optical signal generation unit 3103 ... Optical distribution unit 3111-1, 3111-2 ... Signal termination unit 3112-1, 3112-2 ... Optical signal generation unit 3113 ... Optical switch 3114 ... Monitor light distribution unit 3115 ... Optical monitor / switching Control unit 3121 Signal distribution unit 3122-1, 3122-2 Optical signal generation unit 3131 Optical distribution unit 3132 Optical monitor / switching control unit 3501 Optical amplification unit 3502 Optical distribution unit 3511 Optical distribution unit 3512-1 , 3512-2 ... optical amplification unit 3513 ... optical switch 3514 ... monitor light distribution unit 3515 ... optical monitor / switching control unit 3521-1, 3521-2 ... light Distribution units 3522-1, 3522-2, ... Optical switches 3523-1, 3523-2 ... Monitor light distribution units 3524-1, 3524-2 ... Optical monitor / switching control units 3531-1 to 3531-(M + 1) ... Light Amplification unit 3532: Optical switch 3533-1 to 3533-M: Monitor light distribution unit 3534: Optical monitor / switching control unit 3535-1 to 3535-M: Optical distribution unit 3541-1 to 3541- (M + 1): Optical distribution Sections 3541-2-3542-M ... Optical switches 3541-3-3543-M ... Monitor light distribution section 3544 ... Optical monitor / switching control section 3551 ... Optical distribution section 3552 ... Optical monitor / switching control sections 3561-1, 3561 -2 ... Optical distribution unit 3562 ... Optical monitor / switching control unit 3563-1, 3563-2 ... Optical switch

Claims (8)

An optical transmission unit that outputs an optical signal generated from the received signal;
And one or more hierarchical optical amplification distributors for amplifying and branching the optical signal;
The light transmission unit
A signal termination selection unit for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals;
An optical signal generation unit that generates and outputs an optical signal of a signal format used in a lower network from the signal output from the signal termination selection unit;
And an optical transmitter side optical distributor for distributing and outputting the optical signal output from the optical signal generator to one or more.
The optical amplification distribution unit
An optical amplification unit that inputs one optical signal output from the optical transmission unit or another optical amplification distribution unit at the previous stage, amplifies the optical power, and outputs the amplified optical power;
An optical amplifier / distribution unit-side optical distribution unit that divides and outputs the optical signal output from the optical amplification unit into a plurality of units;
The light amplification and distribution unit side light distribution unit included in the last stage light amplification and distribution unit sends out the distributed light signal to a lower network.
Containment station apparatus characterized in that. An optical transmission unit that outputs an optical signal generated from the received signal;
And one or more hierarchical optical amplification distributors for amplifying and branching the optical signal;
The light transmission unit
A plurality of signal termination units respectively terminating a plurality of redundant signals received from the upper network;
A plurality of optical signal generation units for generating and outputting optical signals of a signal format used for a lower network from the signals terminated by the corresponding signal termination units;
An optical switch that outputs one optical signal selected from the optical signals output from the plurality of optical signal generation units;
A monitor light distribution unit that distributes optical power of a part of the optical signal output from the optical switch;
A control unit that controls selection of an optical signal by the optical switch based on information obtained as a result of monitoring one of the optical signals distributed by the monitoring optical distribution unit;
And a light distribution unit that distributes the other light signal distributed by the monitoring light distribution unit to one or more and outputs the signal.
The optical amplification distribution unit
An optical amplification unit that inputs one optical signal output from the optical transmission unit or another optical amplification distribution unit at the previous stage, amplifies the optical power, and outputs the amplified optical power;
An optical amplifier / distribution unit-side optical distribution unit that divides and outputs the optical signal output from the optical amplification unit into a plurality of units;
The light amplification and distribution unit side light distribution unit included in the last stage light amplification and distribution unit sends out the distributed light signal to a lower network.
Containment station apparatus characterized in that. An optical transmission unit that outputs an optical signal generated from the received signal;
And one or more hierarchical optical amplification distributors for amplifying and branching the optical signal;
The light transmission unit
A signal termination selection unit for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals;
A signal distribution unit that distributes the signal output from the signal termination selection unit into a plurality of signals;
A plurality of optical signal generation units that respectively receive the plurality of signals output from the signal distribution unit, generate optical signals of a signal format used for a lower network from the input signals, and output the optical signals;
An optical switch for outputting one optical signal selected from the optical signals output from each of the plurality of optical signal generation units;
A monitor light distribution unit that distributes optical power of a part of the optical signal output from the optical switch;
A control unit that controls selection of an optical signal by the optical switch based on information obtained as a result of monitoring one of the optical signals distributed by the monitoring optical distribution unit;
And a light distribution unit that distributes the other light signal distributed by the monitoring light distribution unit to one or more and outputs the signal.
The optical amplification distribution unit
An optical amplification unit that inputs one optical signal output from the optical transmission unit or another optical amplification distribution unit at the previous stage, amplifies the optical power, and outputs the amplified optical power;
An optical amplifier / distribution unit-side optical distribution unit that divides and outputs the optical signal output from the optical amplification unit into a plurality of units;
The light amplification and distribution unit side light distribution unit included in the last stage light amplification and distribution unit sends out the distributed light signal to a lower network.
Containment station apparatus characterized in that. An optical transmission unit that outputs an optical signal generated from the received signal;
And one or more hierarchical optical amplification distributors for amplifying and branching the optical signal;
The light transmission unit
A signal termination selection unit for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals;
An optical signal generation unit that generates and outputs an optical signal of a signal format used in a lower network from the signal output from the signal termination selection unit;
And an optical transmitter side optical distributor for distributing and outputting the optical signal output from the optical signal generator to one or more.
The optical amplification distribution unit
An input light distribution unit that inputs one of the optical signals output from the optical transmission unit or another optical amplification and distribution unit at the previous stage, divides the light signal into a plurality, and outputs the signal;
A plurality of optical amplification units each of which receives the plurality of optical signals output from the input light distribution unit, and amplifies and outputs optical power;
An optical switch for outputting one optical signal selected from the optical signals output from each of the plurality of optical amplification units;
A monitor light distribution unit that distributes optical power of a part of the optical signal output from the optical switch;
A control unit that controls selection of an optical signal by the optical switch based on information obtained as a result of monitoring one of the optical signals distributed by the monitoring optical distribution unit;
And a light distribution unit that distributes the other light signal distributed by the monitoring light distribution unit to one or more and outputs the signal.
The light distribution unit included in the last stage light amplification and distribution unit transmits the distributed light signal to a lower network.
Containment station apparatus characterized in that. An optical transmission unit that outputs an optical signal generated from the received signal;
And one or more hierarchical optical amplification distributors for amplifying and branching the optical signal;
The light transmission unit
A signal termination selection unit for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals;
An optical signal generation unit that generates and outputs an optical signal of a signal format used in a lower network from the signal output from the signal termination selection unit;
And an optical transmitter side optical distributor for distributing and outputting the optical signal output from the optical signal generator to one or more.
The optical amplification distribution unit
An input light distribution unit that inputs one of the optical signals output from the optical transmission unit or another optical amplification distribution unit in the previous stage, and divides and outputs a plurality of optical signals;
A plurality of optical amplification units each of which receives the plurality of optical signals output from the input light distribution unit, amplifies the optical power, and outputs the amplified optical power;
A plurality of light distribution units that input the light signal output from the corresponding light amplification unit, distribute the light signal into a plurality, and output the light signal;
A plurality of optical switches for outputting one optical signal selected from the optical signals output from each of the plurality of optical distribution units;
A plurality of monitor light distribution units that distribute the optical power of a part of the optical signal output from the corresponding optical switch;
And a plurality of control units for controlling selection of the optical signal by the corresponding optical switch based on information obtained as a result of monitoring the one of the optical signals distributed by the corresponding monitoring light distribution unit.
The monitoring light distribution unit included in the last stage optical amplification distribution unit transmits the other light signal to a lower network.
Containment station apparatus characterized in that. An optical transmission unit that outputs an optical signal generated from the received signal;
And one or more hierarchical optical amplification distributors for amplifying and branching the optical signal;
The light transmission unit
A signal termination selection unit for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals;
An optical signal generation unit that generates and outputs an optical signal of a signal format used in a lower network from the signal output from the signal termination selection unit;
And an optical transmitter side optical distributor for distributing and outputting the optical signal output from the optical signal generator to one or more.
The optical amplification distribution unit
A plurality of optical amplification units each of which receives the plurality of optical signals output from the optical transmission unit or the preceding stage optical amplification and distribution unit and amplifies the optical power of the input optical signal;
An optical switch for outputting optical signals of a plurality of operation systems selected from the optical signals output from the plurality of optical amplification units and optical signals of one or more spare systems;
A plurality of monitor light distribution units for receiving the optical signals of the plurality of operation systems output from the optical switch and distributing the optical power of a part of the input optical signals;
The light of the operation system by the optical switch based on the information obtained as a result of monitoring the optical signal of the spare system output by the optical switch and one of the optical signals distributed by the plurality of monitor light distribution units A control unit that controls signal selection;
And a plurality of light distribution units for distributing the other light signal output from the corresponding monitor light distribution unit to one or more outputs.
The plurality of light distribution units included in the last stage light amplification and distribution unit transmit the distributed light signals to a lower network.
Containment station apparatus characterized in that. An optical transmission unit that outputs an optical signal generated from the received signal;
And one or more hierarchical optical amplification distributors for amplifying and branching the optical signal;
The light transmission unit
A signal termination selection unit for terminating a plurality of redundant signals received from the upper network and outputting a signal selected based on the reception quality among the terminated signals;
An optical signal generation unit that generates and outputs an optical signal of a signal format used in a lower network from the signal output from the signal termination selection unit;
And an optical transmitter side optical distributor for distributing and outputting the optical signal output from the optical signal generator to one or more.
The optical amplification distribution unit
A plurality of optical amplification units for inputting one of the optical signals output from the optical transmission unit or another optical amplification / distribution unit at the previous stage, and amplifying optical power of the input optical signals;
A plurality of light distribution units that distribute and output a plurality of the optical signals output from the corresponding optical amplification units;
Output one optical signal selected from one of the plurality of optical signals distributed by the corresponding optical distribution unit of the operation system and one of the plurality of optical signals distributed by the optical distribution unit of the backup system With multiple optical switches,
A plurality of monitor light distribution units that distribute the optical power of a part of the optical signal output from the corresponding optical switch;
A plurality of information based on information obtained by monitoring one of the optical signals distributed by each of the plurality of monitoring optical distribution units and one of the optical signals output from the optical distribution unit of the spare system A controller configured to control selection of an optical signal by the optical switch;
The monitoring light distribution unit included in the last stage optical amplification distribution unit transmits the other light signal to a lower network.
Containment station apparatus characterized in that. The light distribution unit also has the function of the monitor light distribution unit.
The base station apparatus according to any one of claims 2 to 7, characterized in that:

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