JP5945491B2 - Optical communication line switching device and optical communication line switching method using the switching device - Google Patents

Description

  The present invention relates to an optical communication line switching device for performing line switching in trouble relocation work or the like of an optical communication line, and an optical communication line switching method using the switching device.

  In an optical communication system using an optical line using an optical fiber cable, line switching work for switching a connector connection part of an active optical line to a new optical line is performed. As optical line switching technologies that have already been put into practical use, optical fiber cable switching connection systems aiming at shortening of borrowing time and switching work period are proposed in, for example, Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4. ing.

  However, the technology proposed above replaces the optical fiber (medium) from the working optical line to the detour optical line, and physical disconnection is inevitable, and a momentary interruption of about 30 ms occurs when the line is switched. Therefore, there is a problem that service interruption occurs due to communication interruption. Moreover, it is not applicable when not connected by a connector. Furthermore, there is a problem that it cannot be applied when the accommodation of the transmission apparatus is changed.

Japanese Patent Laid-Open No. 01-230309 Japanese Patent Laid-Open No. 01-144004 Japanese Patent Laid-Open No. 03-064710 Japanese Patent Laid-Open No. 03-268630

  As described above, in the conventional optical communication line switching technology, the optical fiber (medium) is switched from the working line to the detour line, so physical disconnection is unavoidable, and a momentary interruption of about 30 ms occurs. Therefore, there is a problem that service interruption occurs due to communication interruption.

  The present invention has been made paying attention to the above-mentioned circumstances, and it is possible to set an arbitrary point on the optical fiber constituting the coating instead of a connection point (connector connection point) of the existing line as a switching point. An object of the present invention is to provide an optical communication line switching device that enables line switching between transmission devices when the accommodation of the device is changed, and an optical communication line switching method using the switching device.

The optical communication line switching apparatus according to the present invention has the following configuration.
(1) In an optical communication line switching apparatus for switching an ONU (subscriber side transmission apparatus) connected to an active OLT (station side transmission apparatus) via a working optical line optical fiber to another new OLT, the working optical line light A pair of optical power branching means for inputting / outputting optical signals to / from the fiber; a detour optical fiber connected to the pair of optical power branching means; and an optical signal amplifying through the detour optical fiber An optical repeater for performing, an optical temporary blocking means for temporarily blocking the optical communication, which is interposed in the working optical line optical fiber, and the respective operations of the pair of optical power branching means and the temporary optical blocking means. and control means for controlling said optical relay means, the binding when coupling the optical signal from the bypass optical fiber by the optical power branching means connected to the working OLT vicinity The coupling efficiency when coupling the optical signal from the bypass optical fiber by the optical power branching means connected in the vicinity of the ONU with the rate η1 [dB] is η2 [dB], and the minimum receiving sensitivity in the working OLT and ONU Are P1 [dBm] and P2 [dBm], respectively, the amplified output of the optical signal in the optical repeater is η1 + P1 [dBm] or more for the OLT side and η2 + P2 [dBm] for the ONU side The embodiment is as described above.

(2) In (1), the pair of optical power branching means is an optical power branching coupler previously installed in the working optical line optical fiber.
(3) In (1), one of the pair of optical power branching means is an optical power branching coupler previously installed in the working optical line optical fiber, and the other is attached to the working optical line optical fiber. It is set as the aspect which is a side light input / output mechanism.

(4) In (1), each of the pair of optical power branching means is a side light input / output mechanism attached to the working optical line optical fiber .

( 5 ) In (3) or (4), the side light input / output mechanism includes a bending portion for determining a bending diameter for temporarily bending a part of the working optical line optical fiber, A concave portion having a diameter corresponding to the diameter, an optical block for holding the optical fiber between the bent portion and the concave portion, a probe fiber for inputting and outputting an optical signal to the bypass optical fiber, and the working light beam A condensing lens for condensing and inputting the light leaked from the bent portion of the path optical fiber to the probe fiber is provided.

( 6 ) In ( 5 ), the side light input / output mechanism includes a slide guide for fixing a center line of the bent portion and the optical block, one side fixed on the center line of the bent portion, and the other side serving as a servo horn. It is set as the aspect provided with the shaft which connects and slides the position of a bending part along a slide guide, the servo horn which pushes and pulls the said shaft, and the servo motor which rotates the said servo horn.

The optical communication line switching method according to the present invention is configured as follows.
( 7 ) An optical communication line switching method for switching an ONU (subscriber side transmission apparatus) connected to an active OLT (station side transmission apparatus) to another new OLT, registering ONU information in the new OLT, An optical amplifying means for amplifying the bypass optical fiber and the optical signal, with respect to a pair of optical power branching means for inputting / outputting an optical signal, provided in the working optical line optical fiber connecting the active OLT and the ONU. At the same time as the connection, a temporary light blocking means for temporarily blocking the optical communication is connected, and in this state, the working optical line optical fiber is cut and connected to a new optical line optical fiber connected to the new OLT. coupling efficiency when running process to remove the detour optical fiber, further coupling the optical signal from the bypass path optical fiber by the optical power branching means connected to the working OLT vicinity η1 [dB] and the coupling efficiency when the optical signal from the bypass optical fiber is coupled by the optical power branching means connected in the vicinity of the ONU is η2 [dB], and the minimum receiving sensitivity in the working OLT and ONU is When P1 [dBm] and P2 [dBm] are set, respectively, the amplification output of the optical signal in the optical amplification means is η1 + P1 [dBm] or more with respect to the OLT side, and η2 + P2 [dBm] or more with respect to the ONU side. and door name Ru aspect.

  According to the present invention, an arbitrary point on the optical fiber constituting the coating can be used as a switching point instead of a connection point (connector connection point) of an existing line, and between transmission devices when the accommodation of the transmission device is changed. It is possible to provide an optical communication line switching device that enables line switching across the network and an optical communication line switching method using the switching device.

  Specifically, the working line and the detour path are configured by using the side light input / output mechanism or the existing optical branching coupler at two places in the upper and lower parts of the switching section, and the working line is further provided with a temporary light blocking mechanism. In addition, the detour path includes an optical amplification mechanism, and the side light input / output mechanism and the temporary light cut-off mechanism are connected to the control unit, and the apparatus and the method enable instantaneous line switching without affecting the service. Furthermore, switching between transmission apparatuses at the time of changing the accommodation of the transmission apparatus is realized by previously registering existing ONU information in a new OLT and then implementing the above switching apparatus and method. By using the technique of the present invention, it is possible to expand the application range for line switching without causing service interruption.

It is a block diagram which shows the state of step S1 of the optical communication line switching apparatus which concerns on 1st Embodiment. It is a block diagram which shows the state of step S2, S3 of the optical communication line switching apparatus which concerns on 1st Embodiment. It is a block diagram which shows the state of step S4 of the optical communication line switching apparatus which concerns on 1st Embodiment. It is a block diagram which shows the state of step S5 of the optical communication line switching apparatus which concerns on 1st Embodiment. It is a block diagram which shows the state which replaced with the optical power branching coupler of the optical communication line switching apparatus which concerns on 1st Embodiment, and was set as the side light input / output mechanism. It is a block diagram which shows the structure which replaced with the side light input / output mechanism of the optical communication line switching apparatus which concerns on 1st Embodiment, and was set as the optical power branching coupler installed previously. It is a block diagram which shows the structure of the side light input / output mechanism of the optical communication line switching apparatus which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows schematic structure for demonstrating a method different from the side light input / output mechanism shown in FIG.

Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiment described below is an example of the configuration of the present invention, and the present invention is not limited to the following embodiment.
(First embodiment)
First, an optical communication line switching method capable of changing a route between transmission apparatuses will be described with reference to FIGS. 1 to 6. 1 to 6, 1 is a working optical line optical fiber, 2 is a bypass optical fiber, 3-1 and 3-2 are side light input / output mechanisms, 4 is a temporary light blocking mechanism, 5 is an optical repeater, 6 is a control unit, 7-1, 7-2 and 7-3 are optical power branching couplers, 17 is a data registration unit, 100-1 is an active OLT (station side transmission apparatus), 100-2 is a new OLT, and 101 is An ONU (subscriber side transmission apparatus) 300 is a new optical line optical fiber.

The following procedure is performed when switching the optical communication line.
(Step S1)
In FIG. 1, a working optical line optical fiber 1 optically connects a working OLT 100-1 and an ONU 101, and an optical power branching coupler 7-1 is interposed in the middle. In this system, in order to accommodate the ONU 101 in the new OLT 100-2, the optical power branching coupler 7-2 is interposed in the new optical line optical fiber 300 that is optically connected to the new OLT 100-2. In this state, the data registration unit 17 is used to register connection information data such as an ONU / MAC address for storing the ONU 101 in the new OLT 100-2, an inter-device distance, and data being transmitted.

(Step S2)
In FIG. 2, a side light input / output mechanism 3-1 and a temporary light blocking mechanism 4 are serially interposed in the working optical line optical fiber 1, and the side light input / output mechanism 3-1, optical power branching coupler 7-1, The detour optical fiber 2 is optically connected through the optical repeater 5 and the side light input / output mechanism 3-1 and the light temporary blocking mechanism 4 are driven and controlled by the control unit 6.

That is, in this step S2, one end of the detour path is connected to the optical power branching coupler 7-1 of the working OLT 100-1. The detour path at this time is composed of a detour optical fiber 2 and an optical repeater 5 for amplifying a signal provided in the middle.
(Step S3)
As shown in FIG. 2, one end of the bypass path on the ONU 101 side is attached to an optical fiber line that optically connects the active OLT 100-1 and the ONU 101. At this time, the side light input / output mechanism 3-1 and the temporary light blocking mechanism 4 are simultaneously and instantaneously attached to the working optical line optical fiber 1.

  By attaching the side light input / output mechanism 3-1, the optical signal transmitted through the working optical line optical fiber 1 is changed to transmission via the detour route. At this time, the optical repeater 5 has a coupling efficiency η1 [dB] when the optical signal from the detour path is coupled by the optical power branching coupler 7-1 connected in the vicinity of the active OLT 100-1, and in the vicinity of the ONU 101. The coupling efficiency when the optical signal from the detour path is coupled by the connected side optical input / output mechanism 3 is η2 [dB], and the minimum receiving sensitivity in the working OLT 100 and ONU 101 is P1 [dBm] and P2 [dBm]. In this case, the amplified output of the optical signal in the optical repeater 5 is η1 + P1 [dBm] or more for the OLT side and η2 + P2 [dBm] or more for the ONU side. For example, the signal coupling efficiency of the side optical input / output mechanism 3-1 is -20 dB, the leakage power coupling rate to the bypass connection port of the optical power branching coupler 7-1 is -7 dB, and the ONU 101, the working OLT 100- Assuming that the output signal power from 1 is 0 dBm and the minimum receiving sensitivity is -25 dBm, the signal amplification characteristics in the optical repeater 5 have an amplification factor of +2 dB and an output of -18 dBm or more with respect to the ONU101-active OLT 100-1 signal. The downstream signal has the same amplification factor of +2 dB, but the output is designed to have a performance of -5 dBm or more.

  When a signal that has been routed through a detour is received by the ONU 101, if the signals from the working line merge and are input to the ONU 101, noise is generated and the error rate of the signal is increased. The working line signal power is reduced by the mechanism 4.

(Step S4)
As shown in FIG. 3, the working optical line optical fiber 1 is cut, and the signal transmission route is switched to the new optical line optical fiber 300. Since the optical signal between the ONU 101 and the working OLT 100-1 is transmitted by the detour optical fiber 2, the communication between the ONU 101 and the working OLT 100-1 is not interrupted even if the working optical line optical fiber 1 is cut. The cut end face of the working optical line optical fiber 1 to which the ONU 101 is connected is connected to the new optical line optical fiber 300 optically connected to the new OLT 100-2 prepared in step S1.

(Step S5)
As shown in FIG. 4, the side light input / output mechanism 3-1 and the temporary light blocking mechanism 4 are removed simultaneously. The signal from the ONU 101 is changed from the detour route to the new optical line route. Since the accommodation information of the ONU 101 is registered in advance in the new OLT 100-2, the ONU 101 is immediately detected to ensure the communication state.

  At this time, by installing the optical power branching coupler 7-2 in the new optical line optical fiber 300, it is possible to perform the same optical communication line switching when the accommodation change of the transmission apparatus occurs again. .

  In the first embodiment, a side light input / output mechanism 3-2 may be used instead of the optical power branching coupler 7-1 as shown in FIG. Alternatively, as shown in FIG. 6, the side light input / output mechanism 3-1 may be an optical power branching coupler 7-3 installed in advance. At this time, the power amplification factor of the optical repeater 5 is changed in accordance with each coupling efficiency.

(Second Embodiment)
The side light input / output mechanism 3 (3-1, 3-2) will be described with reference to FIG.
In FIG. 7, 9 is a probe fiber, 10 is a cylindrical bent portion, 11 is an optical fiber, 12 is an optical block, and 13 is a condensing lens.
In the optical fiber 11, the refractive index of the core is slightly increased with respect to the cladding, whereby the optical signal in the core repeats total reflection and transmits with low loss. At this time, by giving the optical fiber 11 a bent shape, the total reflection condition is relaxed, and the optical signal leaks to the cladding.

  Therefore, as shown in FIG. 7 (a), the optical fiber 11 is sandwiched between an optical block 12 having a cylindrical bent portion 10 and a concave portion having a shape matching the outer diameter of the bent portion, and FIG. 7 (b). By applying pressure as shown, the optical signal from the optical fiber 11 is leaked. On the other hand, the optical fiber 12 is provided with a lens 13 for condensing the leakage signal and a probe fiber 9 connected in accordance with the condensing center of the condensing lens 13. The lens 13 and the probe fiber 9 may be attached to the outside of the optical block 12.

  Here, the temporary light blocking mechanism 4 in the first embodiment can be realized by forcibly leaking an optical signal to the outside of the optical fiber by utilizing leakage due to bending as a structure. Leakage can be increased by reducing the diameter of the bend. By controlling the amount of leakage, the side light input / output mechanism 3 and the temporary light blocking mechanism 4 may be integrated, but if the diameter of the bend generated for blocking is made too small, it will break and cause a failure. It becomes. When the receiving sensitivity of the transmission device of the optical fiber 11 is high, the side light input / output mechanism 3 and the temporary light blocking mechanism 4 must be attached at the same time.

(Third embodiment)
Another configuration of the side light input / output mechanism 3 (3-1, 3-2) will be described with reference to FIG.
In FIG. 8, 8 is a servo horn, 9 is a probe fiber, 10 is a cylindrical bent portion, 11 is an optical fiber, 12 is an optical block, 14 is a servo motor, 15 is a pair of slide guides, and 16 is a shaft. Yes.

  As described above, the side light input / output mechanism 3 needs to be operated simultaneously with the temporary light blocking mechanism 4. Therefore, a pair of slide guides 15 are installed to align the center of the bent portion 10 and the center of the concave portion of the optical block 12 in a straight line, one end of the shaft 16 is fixed in the bent portion 10 and the other end is connected to the servo horn 8. To do. In addition, a servo horn is attached to the servo motor 14 and rotated. When the servo horn 8 rotates, the shaft 16 pushes and pulls the bending portion 10. At this time, when the optical fiber 11 is placed between the bent portion 10 and the concave portion of the optical block 12, the optical fiber 11 can be bent or opened by rotation control by the servo motor 14.

According to the above-described embodiment, an optical communication line switching device that can prevent service interruption even when a physical disconnection of a working optical line optical fiber due to connection change of a medium occurs, and light using the switching device A communication line switching method can be provided.
By performing switching using the technology of the present invention, it becomes possible to switch lines without causing service interruption, and therefore, efficient work that eliminates the need for line borrowing and adjustment operations. Further, the present invention can be applied even when the connector is not connected.

  In the conventional method, the connector is moved. In the present invention, however, the bending power is gradually added to the working optical line optical fiber and the leakage power is increased at the same time as the change in bending. Since the signal is coupled to the detour optical fiber, communication can be continuously maintained. In addition, since the bending force can be applied with a constant force for forming the bend at the time of bending, the coupling efficiency can be stabilized.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some configurations may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different example embodiments may be combined as appropriate.

  DESCRIPTION OF SYMBOLS 1 ... Working optical line optical fiber, 2 ... Detour optical fiber, 3-1, 3-2 ... Side light input / output mechanism, 4 ... Light temporary interruption | blocking mechanism, 5 ... Optical repeater, 6 ... Control part, 7- DESCRIPTION OF SYMBOLS 1,7-2,7-3 ... Optical power branch coupler, 8 ... Servo horn, 9 ... Probe fiber, 10 ... Cylindrical bending part, 11 ... Optical fiber, 12 ... Optical block, 13 ... Condensing lens, 17 DESCRIPTION OF SYMBOLS ... Data registration part, 14 ... Servo motor, 15 ... A pair of slide guide, 16 ... Shaft, 100-1 ... Working OLT, 100-2 ... New OLT, 101 ... ONU, 300 ... New optical line optical fiber.

Claims (7)

In an optical communication line switching device for switching an ONU (subscriber side transmission device) connected to a working OLT (station side transmission device) via a working optical line optical fiber to another new OLT,
A pair of optical power branching means for inputting and outputting optical signals to and from the working optical line optical fiber;
A bypass optical fiber connected to the pair of optical power branching means;
An optical repeater for amplifying an optical signal interposed in the bypass optical fiber;
Temporary light blocking means interposed in the working optical line optical fiber for temporarily blocking the optical communication;
A control means for controlling the operation of each of the pair of optical power branching means and the temporary light blocking means ,
The optical repeater means has a coupling efficiency η1 [dB] when the optical signal from the bypass optical fiber is coupled by the optical power branching means connected in the vicinity of the working OLT and the optical power connected in the vicinity of the ONU. When the coupling efficiency when coupling the optical signal from the bypass optical fiber by the branching means is η2 [dB], and the minimum receiving sensitivity in the working OLT and ONU is P1 [dBm] and P2 [dBm], respectively, Optical communication line switching characterized in that the amplified output of the optical signal in the optical repeater is η1 + P1 [dBm] or more for the OLT side and η2 + P2 [dBm] or more for the ONU side apparatus. Said pair of optical power branching means, optical communication line switching apparatus according to claim 1, characterized in that the optical power branching coupler installed in advance the current optical path optical fiber. One of said pair of optical power branching means is an optical power branching coupler installed in advance the current optical path optical fiber and one at the side light output mechanism attached to the active optical path optical fiber The optical communication line switching device according to claim 1, wherein the optical communication line switching device is provided. 2. The optical communication line switching device according to claim 1, wherein each of the pair of optical power branching means is a side light input / output mechanism attached to the working optical line optical fiber . The side light input / output mechanism is formed with a bending portion for determining a bending diameter for temporarily bending a part of the working optical line optical fiber, and a concave portion having a diameter corresponding to the diameter of the bending portion, the bent portion and the concave portion and the optical block for pressing the optical fiber between the probe fiber for inputting and outputting optical signals to the periphrastic circuit optical fiber condenses the light leaked from the bent portion of the optical fiber 5. The optical communication line switching device according to claim 3, further comprising a condensing lens for inputting to the probe fiber. The side light input / output mechanism includes a slide guide that fixes the center line of the bending portion and the optical block, one side fixed to the center line of the bending portion, and the other side connected to a servo horn along the slide guide. 6. The optical communication line switching device according to claim 5 , further comprising: a shaft that slides a position of the bending portion; a servo horn that pushes and pulls the shaft; and a servo motor that rotates the servo horn. An optical communication line switching method for switching an ONU (subscriber side transmission apparatus) connected to an active OLT (station side transmission apparatus) to another new OLT,
Register ONU information in the new OLT,
An optical amplifying means for amplifying the detour optical fiber and the optical signal with respect to a pair of optical power branching means provided in the working optical line optical fiber for connecting the working OLT and the ONU and inputting / outputting an optical signal At the same time, a temporary light blocking means for temporarily blocking optical communication is connected, and in this state, the working optical line optical fiber is cut and connected to a new optical line optical fiber connected to the new OLT. run the process to remove the detour fiber-optic Te,
Further, when the optical signal from the detour optical fiber is coupled by the optical power branching means connected in the vicinity of the working OLT, the detouring is performed by the optical power branching means connected in the vicinity of the ONU and the coupling efficiency η1 [dB]. When the coupling efficiency when coupling optical signals from the path optical fiber is η2 [dB], and the minimum receiving sensitivity in the working OLT and ONU is P1 [dBm] and P2 [dBm], respectively, η1 + P1 [dBm] or more with respect to the amplified output of the optical signal the OLT, optical communication line switching method being characterized in that the so that Do and η2 + P2 [dBm] or more to the ONU side.

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