JP6356646B2 - Optical fiber side input / output device and optical line switching system - Google Patents

Description

  The present invention relates to an optical fiber side input / output device that inputs and outputs an optical signal from the side of an optical fiber, and an optical line switching system including the device.

  In communication systems using optical fiber cables, after completing the construction of the communication network, transmit optical signals to the optical fiber core wire to check for disconnection of the optical fiber network, confirm that there is no disconnection, and Offer has started. The optical signal input to the optical fiber and the optical signal output from the optical fiber are received by cutting a part of the optical fiber connecting the transmission devices and attaching the connector, and using this connector. Was common. However, since the service to the subscriber is stopped when the optical fiber is cut, it is necessary to explain the service stop to the subscriber in advance, and the construction period becomes longer. If the construction can be performed without cutting the optical fiber, it is not necessary to give a prior explanation to the subscriber, so that the construction period can be shortened. Further, since it is not necessary to cut the optical fiber during the construction, it is possible to maintain the service to the subscriber even during the construction period.

  Therefore, as a technique for inputting / outputting optical signals to / from the optical fiber without cutting the optical fiber, the existing main optical fiber (input side optical fiber) is bent, and another optical fiber (probe) is bent from the side to the bent portion. The optical fiber side input / output technology for receiving the optical signal emitted from the input side optical fiber at the tip end of the probe fiber is examined. ing.

  For example, in Non-Patent Document 1, the current main optical fiber is bent between a cylindrical block having a convex curved surface and a transparent block having a concave curved surface corresponding to the cylindrical block, and the main optical fiber is bent. The probe fiber is inserted into the gap formed in the transparent block and arranged so that the tip of the probe fiber comes into contact with the bent portion, thereby the optical signal radiated from the main optical fiber to the concave curved surface of the transparent block. A side input / output technique for receiving light by the probe fiber is described.

Hirota et al., "Study of optical line switching device using side input / output technology", IEICE Technical Report, IEICE Technical Report OFT 2013-50 (2014-01)

  The optical fiber side input / output device receives the light leaked by bending the current main optical fiber at the tip of the probe fiber, or the light emitted from the tip of the probe fiber at the bent portion of the main optical fiber. A device that performs input and output. FIG. 1 is a diagram illustrating an optical line switching operation for switching an optical line from a working line to a detour line using a conventional optical fiber side input / output device. In FIG. 1, “IDM” is an integrated optical distribution module (Integrated Distribution Module). In this specification, the main optical fiber may be described as an active line. Further, the tip of the detour path in the optical fiber side input / output device is described as a probe fiber.

  When communication light to be input to the main optical fiber via the detour route reaches the relay amplifier from the station side, it is displayed on the display LED of the relay amplifier housing, so that the operator can confirm the presence of the signal . Further, when the optical fiber side input / output device is used to switch to the detour path, the upstream light from the ONU reaches the relay amplifier, so that the operator can check the presence or absence of a signal with the LED of the relay amplifier housing. That is, conventionally, the success / failure of the optical line switching operation is determined by the display LED of the relay amplifier or the like.

  However, since the repeater amplifier is located away from the optical fiber side input / output device and not at the operator's hand, the line of sight must be separated for the operator to confirm the successful installation of the optical fiber side input / output device. There was a problem of taking time. There is also a problem that it is impossible to confirm that the light from the relay amplifier has reached the optical fiber side input / output device. In addition, when the installation of the optical fiber side input / output device fails, it is necessary to return the communication light to the main optical fiber. However, since it takes time to move the line of sight to the display LED of the relay amplifier housing, There was also a problem that it was not possible to respond immediately.

  For example, it is technically possible to display whether or not the switching is successful by installing the display LED on the optical fiber side input / output device itself so that the line of sight is not separated. However, it is necessary to load LEDs and circuits for this purpose on the optical fiber side input / output device, which increases the size and weight of the device and adds electrical wiring, thereby reducing workability.

  Therefore, the present invention is based on the condition that the size and weight of the optical fiber side input / output device are not increased, and the operator successfully switches the optical line without removing the line of sight from the optical fiber side input / output device. Another object of the present invention is to provide an optical fiber side input / output device and an optical line switching system that can recognize a failure.

  In order to achieve the above object, the optical fiber side input / output device according to the present invention has a window in the vicinity of the bent portion of the main optical fiber so that visible light scattered from the tip of the probe fiber can be visually recognized.

Specifically, an optical fiber side input / output device according to the present invention includes a bending portion forming device that curves a main optical fiber through which communication light propagates to form a bending portion,
A probe fiber that inputs and outputs light to and from the main optical fiber through the bending portion, with a tip approaching the bending portion formed by the bending portion forming device on the main optical fiber;
A window through which the bent portion is visible from the outside;
Is provided.

  This optical fiber side input / output device has a window in a housing, and has a structure in which a bent portion can be seen from the window. For this reason, if visible light is irradiated to a bending part from a probe fiber, visible light will be scattered in a bending part and an operator can visually recognize this through a window. In other words, when performing optical line switching work, if this optical fiber side input / output device is used to detect the communication light propagating on the detour path and the visible light is superimposed on the probe fiber, the worker can scatter visible light. You can confirm the success / failure of the optical line switching work by checking the light. Further, providing a window in the casing of the optical fiber side input / output device does not increase the size and weight of the device.

  Therefore, the present invention is based on the condition that the size and weight of the optical fiber side input / output device are not increased, and the operator does not remove the line of sight from the optical fiber side input / output device. It is possible to provide an optical fiber side input / output device capable of recognizing success or failure of device installation.

  In order to achieve the above object, an optical line switching system according to the present invention has a function of superimposing visible light on a probe fiber of an optical fiber side input / output device when communication light propagating in a detour path is detected. did.

Specifically, the optical line switching system according to the present invention, the optical fiber side input / output device,
A visible light source unit that generates visible light as identification light;
An optical multiplexing unit that couples the identification light to the probe fiber so that the identification light from the visible light source unit is emitted from the tip of the probe fiber;
A detection unit for detecting a state of communication light propagating through the probe fiber;
A control unit that changes the state of the identification light to the visible light source unit according to the state of the communication light detected by the detection unit;
Is provided.

  Here, the detector further includes a relay amplifier that amplifies the communication light propagating through the probe fiber, and the detector detects the state of the communication light with the communication light arriving at the relay amplifier. It is preferable to detect.

When the detection unit (for example, disposed inside the relay amplifier unit) in the detour path detects the upstream signal light from the ONU, it determines that the switching from the main optical fiber to the probe fiber (detour path) has been successful, Combines visible light. When the detection unit detects the downstream signal light from the OLT, the detection unit determines that the switching from the main optical fiber to the probe fiber is successful on the OLT side, and couples the visible light to the probe fiber. This visible light is radiated from the tip of the probe fiber inside the optical fiber side input / output device and scattered on the side surface of the optical fiber. The operator can determine the success of switching to the detour path by checking the scattered light inside the optical fiber side input / output device.
Further, since only visible light is coupled to the detour path, it is not necessary to add an electronic circuit or a display unit for displaying the communication state on the optical fiber side input / output device body, and the weight shape does not increase.

  Therefore, the present invention is based on the condition that the size and weight of the optical fiber side input / output device are not increased, and the operator does not remove the line of sight from the optical fiber side input / output device. It is possible to provide an optical line switching system capable of recognizing success or failure of device installation.

In the optical line switching system according to the present invention, the state of the communication light detected by the detection unit is the presence or absence of the communication light, and the direction in which the communication light propagates.
The state of the identification light that the control unit changes to the visible light source unit is continuous, blinking, and extinction.

  For example, when the light from the OLT reaches the detection unit (for example, a relay amplifier), the visible light is continuously turned on to notify the worker of the arrival of the light from the OLT. When the detection unit detects upstream light from the ONU side (light coupled from the main optical fiber to the probe fiber by the optical fiber side input / output device), the visible light blinks to notify the operator. As a result, the operator can confirm the communication state without removing the line of sight from the optical fiber side input / output device at hand, thus facilitating the work.

In the optical line switching system according to the present invention, the state of the communication light detected by the detection unit is the presence or absence of the communication light, and the direction in which the communication light propagates.
The state of the identification light that the control unit changes to the visible light source unit is a color change.

  For example, when the light from the OLT reaches the detection unit (for example, a relay amplifier), red visible light is continuously turned on to notify the worker of the arrival of the light from the OLT. When the detection unit detects upstream light from the ONU side (light coupled from the main optical fiber to the probe fiber by the optical fiber side input / output device), the blue visible light is blinked to notify the operator. As a result, the operator can confirm the communication state without removing the line of sight from the optical fiber side input / output device at hand, thus facilitating the work.

  The optical line switching system according to the present invention further includes a sound source unit that generates sound according to the state of the communication light detected by the detection unit. The optical line switching system includes a sound source unit, and generates sound from a speaker or an operator's headphones by detecting a downstream optical signal and detecting an upstream optical signal. The worker can determine the success / failure of the optical line switching work by hearing. If a speaker is installed in the relay amplifier, the addition of an electronic circuit or a display unit for displaying the communication state on the optical fiber side input / output device body is unnecessary, and the weight shape does not increase.

  For example, in the optical line switching system according to the present invention, the state of the communication light detected by the detection unit is the presence or absence of the communication light and the direction in which the communication light propagates, and the sound generated by the sound source unit , Continuous sound, intermittent sound, and silence.

When the communication light is a video optical signal for video transmission service and other optical signals,
The optical multiplexing unit combines the other optical signals after combining the identification light and the video optical signal. By combining light for video transmission service and visible light first, and then combining other optical signals such as GE-PON, there is an effect of suppressing loss of optical signals such as GE-PON.

  Since the line switching system according to the present invention includes the above-described optical fiber side input / output device, the operator can use the optical fiber side input / output device according to the present invention to perform the optical fiber side input / output device during the switching work. The communication state can be confirmed without removing the line of sight from the input / output device.

  Therefore, the present invention is based on the condition that the size and weight of the optical fiber side input / output device are not increased, and the operator does not remove the line of sight from the optical fiber side input / output device. It is possible to provide a line switching system capable of recognizing success or failure of device installation.

  The present invention is based on the condition that the size and weight of the optical fiber side input / output device are not increased, and the operator does not remove the line of sight from the optical fiber side input / output device. It is possible to provide an optical fiber side input / output device and an optical line switching system capable of recognizing success or failure.

It is a figure explaining the conventional optical path switching system. It is a figure explaining operation | movement of the optical fiber side input / output apparatus which concerns on this invention. It is a figure explaining the case where communication light is not propagating through a detour. It is a figure explaining operation | movement of the optical fiber side input / output apparatus which concerns on this invention. It is a figure explaining the case where the downlink communication light from the OLT side propagates a detour. It is a figure explaining operation | movement of the optical fiber side input / output apparatus which concerns on this invention. It is a figure explaining the case where the upstream communication light from ONU side propagates a detour. It is a figure explaining the optical line switching system concerning the present invention. It is a figure explaining the optical line switching system concerning the present invention. It is a figure explaining the optical line switching system concerning the present invention. It is a figure explaining the optical line switching system concerning the present invention. It is a figure explaining the optical line switching system concerning the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, details of an embodiment for carrying out the present invention will be described with reference to the drawings. In addition, this invention is not limited by the following description, In the range which does not deviate from the summary of this invention, it can change suitably. In the present specification and drawings, the same reference numerals denote the same components.

[First Embodiment]
2 to 4 are diagrams for explaining the operation of the optical fiber side input / output device 301 of the present embodiment. The optical fiber side input / output device 301 bends the main optical fiber of the working line 100 to transmit communication light from the detour line 150 via the surface of the bent portion of the optical fiber, such as an ONU. A device that inputs and outputs to the communication terminal side.

The optical fiber side input / output device 301 includes a bending portion forming unit 15 that forms a bending portion by bending the main optical fiber 100 through which communication light propagates,
A probe fiber 150 that causes the bent portion forming device 15 to approach the bent portion formed in the main optical fiber 100 and to input / output light to / from the main optical fiber 100 through the bent portion;
A window 10 through which the bent portion is visible from the outside;
Is provided.
The probe fiber refers to an optical fiber at the tip of the detour path 150.

  The bending portion forming device 15 includes a cylindrical block 15a having a convex curved surface and a transparent block 15b having a concave curved surface corresponding to the cylindrical block 15a. The main optical fiber 100 is disposed between the cylindrical block 15a and the transparent block 15b. The probe fiber 150 is inserted into a gap formed in the transparent block 15b, and is arranged so that the tip of the probe fiber abuts against the bent portion (FIGS. 2 and 3). Then, during the optical line switching operation, a bending portion is formed in the main optical fiber 100 by pushing the cylindrical block 15a toward the transparent block 15b (FIG. 4).

  The communication light transmitted by the OLT on the detour line 150 is radiated from the tip (probe fiber) of the detour path 150 via a relay amplifier (not shown in FIGS. 2 to 4), and the bent portion of the main optical fiber of the working line 100. Is incident on. The communication light transmitted by the ONU leaks from the bent portion of the main optical fiber of the working line 100, enters the tip of the probe fiber, and propagates through the detour path 150.

  However, since the communication light is near-infrared, even if it is scattered on the surface of the bent portion, the operator cannot see it. Therefore, the visible light is combined into the detour path 150, and the optical fiber side input / output device 301 emits visible light from the tip of the probe fiber. The emitted visible light is scattered on the surface of the bent portion. Since it is visible light, the operator can visually observe the scattering. If the vicinity of the bent portion of the housing is made transparent or semi-transparent as the window 10, scattering of visible light can be visually observed from the outside of the apparatus.

Depending on the state of communication light, visible light can be observed in the optical fiber side input / output device 301 as follows.
(1) The visible light is turned off before the optical line switching operation (when communication light is not propagated to the detour line 150 in both uplink and downlink) (FIG. 2).
FIG. 2 shows a state before the bent portion is formed in the main optical fiber 100. Communication light does not propagate through the detour line 150. In this case, the incidence of visible light on the probe fiber is stopped. Since the worker cannot visually recognize the scattered light in the window 10 of the optical fiber side input / output device 301, the operator can easily confirm that the communication light does not propagate in the detour path 150.
(2) Before the optical line switching work, when the downlink communication light to the ONU propagates on the bypass line 150, visible light is continuously lit (FIG. 3).
Downlink communication light propagates on the detour line 150. In this case, continuous visible light is incident on the probe fiber. Visible light from the probe is scattered in the transparent block 15b. The operator can visually recognize the visible light scattered from the window 10 of the optical fiber side input / output device 301, and further visually recognizes that the light is scattered continuously, and the downstream communication light propagates to the detour path. I can confirm that.
(3) After the optical line switching work, when the upstream communication light from the ONU propagates to the detour line 150, the visible light blinks (FIG. 4).
Uplink communication light propagates on the detour line 150. In this case, blinking visible light is incident on the probe fiber. Visible light from the probe is scattered in the transparent block 15b. The operator can visually recognize the visible light scattered in the window 10 of the optical fiber side input / output device 301, and further confirm that the scattering is blinking, and that the upstream communication light has propagated to the detour path. Can be confirmed.

  By using the optical fiber side input / output device 301, the switching operator can confirm that the downlink communication light has reached the tip of the detour path 150, and the upstream communication light from the ONU propagates through the detour path 150 after the fiber is bent. It can be easily visually recognized through the window 10. That is, the operator can easily confirm whether the installation of the optical fiber side input / output device is successful or unsuccessful without removing his / her line of sight during the switching operation, thereby improving work efficiency.

[Second Embodiment]
FIG. 5 is a diagram for explaining the optical line switching system 401 of the present embodiment. The optical line switching system 401 includes an optical fiber side light input / output device 301,
A visible light source 170 that generates visible light as identification light;
An optical combiner 20 that couples the identification light to the detour 150 so that the identification light from the visible light source 170 is emitted from the tip of the probe fiber;
Detectors (163, 164) for detecting the state of communication light propagating through the detour line 150;
A control unit 30 that causes the visible light source 170 to change the state of the identification light according to the state of the communication light detected by the detection units (163, 164);
Is provided.

  Here, the optical line switching system 401 includes a detection unit (163, 164), and further includes a relay amplifier unit 160 that amplifies communication light propagating through the probe fiber. The detection unit (163, 164) includes The state of the communication light is detected from the communication light arriving at the relay amplifier unit 160.

  The state of communication light and the operation of the visible light source will be described with reference to FIG. The optical line switching system 401 is configured to use the light detection units (163, 164) in the relay amplifier unit 160. The relay amplifier unit 160 includes an OLT optical transceiver 161 that communicates with the OLT side and an ONU optical transceiver 162 that communicates with the ONU side. Further, the relay amplifier unit 160 has a downstream light detection unit 163 that detects downstream communication light with a photodiode when downstream communication light from the OLT reaches the OLT optical transceiver 161. The relay amplifier unit 160 includes an upstream light detection unit 164 that detects upstream communication light with a photodiode when upstream communication light from the ONU reaches the ONU optical transceiver 162.

  Each of the downstream light detection unit 163 and the upstream light detection unit 164 transmits the detection signal to the visible light source control unit 30 by, for example, a TTL (Transistor-Transistor Logic) signal. The visible light source control unit 30 turns on the visible light source 170 continuously in the case of detecting downstream light, and blinks the visible light source 170 in the case of detecting upstream light. The visible light from the visible light source 170 is combined with the communication light from the paired ONU optical transceiver 162 by the WDM coupler 21 and is emitted from the probe fiber of the optical fiber side input / output device 301.

  This will be specifically described. When downlink communication light having a wavelength of 1490 nm arrives at the relay amplifier unit 160 from the OLT via the detour line 150, the downlink light detection unit 163 notifies the visible light source control unit 30 of a detection signal. The relay amplifier unit 160 outputs downlink communication light from the pair ONU optical transceiver 162 to the tip (probe fiber) of the detour line 150. Further, the visible light source control unit 30 outputs continuous visible light from the visible light source 170 based on the detection signal. The continuous visible light is combined with communication light by the WDM coupler 21 and output from the probe fiber tip to the bent portion of the main optical fiber.

  On the other hand, when upstream communication light having a wavelength of 1310 nm that has leaked from the bent portion of the main optical fiber has arrived at the relay amplifier unit 160, the upstream light detection unit 164 notifies the visible light source control unit 30 of a detection signal. The relay amplifier unit 160 outputs upstream communication light from the OLT optical transceiver 161 in the OLT direction. Further, the visible light source control unit 30 causes the visible light source 170 to output blinking visible light based on the detection signal. The blinking visible light is input to the probe fiber by the WDM coupler 21 and output from the tip of the probe fiber to the bent portion of the main optical fiber.

  Note that when neither the downstream light detection unit 163 nor the upstream light detection unit 164 detects communication light, the visible light source control unit 30 does not output visible light from the visible light source because no detection signal is output.

  FIG. 6 is a diagram illustrating an operation in which an operator performs track switching work using the optical track switching system 401. The operator can visually check the communication status in the optical fiber side input / output device 301 by the visible light scattering from the visible light source 170. Further, the operator can grasp the state of the communication light by confirming that the scattered light is continuous, blinking, or invisible (visible light source is turned off). Thereby, since the worker can work without removing his / her line of sight from the optical fiber side input / output device 301, work efficiency can be expected.

[Third Embodiment]
FIG. 7 is a diagram illustrating the optical line switching system 402 of the present embodiment. The optical line switching system 402 further includes a sound source unit 40 that generates sound according to the state of the communication light detected by the detection units (163, 164) in the optical line switching system 401 described in FIG. The sound source unit 40 includes a sound source control unit 41 and a speaker 42. The speaker 42 may be a worker's headphones or the like. In the optical line switching system 402, operations other than the sound source unit 40 are the same as those of the optical line switching system 401 in FIG. For this reason, below, the thing regarding the sound source part 40 is demonstrated.

  The upstream light detection unit 164 and the downstream light detection unit 163 transmit the optical detection signals of the upstream communication light and the downstream communication light to the visible light source control unit 30 and the sound source control unit 41, respectively, and interlock with the visible light source control unit 30. . For example, when downlink communication light is detected, the visible light source control unit 30 causes the visible light source 170 to be continuously turned on, and the sound source control unit 41 causes the speaker 42 to generate a continuous sound. When the upstream communication light is detected, the visible light source control unit 30 blinks the visible light source 170, and the sound source control unit 41 causes the speaker 42 to repeatedly generate and stop sound.

  When neither the downstream light detection unit 163 nor the upstream light detection unit 164 detects communication light, the visible light source control unit 30 does not output visible light from the visible light source 170 because the detection signal is not output. The unit 41 also does not output sound from the speaker 42.

  The optical line switching system 402 makes it possible for the worker to grasp the communication status by visual and auditory sense by interlocking light and sound in this way. Sound is effective when it is difficult to visually recognize visible light in fine weather, and the operator can more reliably grasp the communication status by using the optical line switching system 402.

[Fourth Embodiment]
FIG. 8 is a diagram illustrating the optical line switching system 403 of the present embodiment. FIG. 9 is a diagram for explaining an operation in which an operator performs track switching work using the optical track switching system 403. In some cases, a video transmission service (wavelength: 1550 nm) is provided along with the GE-PON optical signal on the working line. In general, the amplification relay of the video transmission service is performed by a fiber amplifier. The optical line switching system 403 is a system for switching communication light including a video transmission service from an active line to a detour line.

  The optical line switching system 403 further includes a fiber amplifier 180 for video light signals and a WDM coupler 190 that multiplexes and demultiplexes communication light and video light signals in the optical line switching system 401 of FIG. Further, the optical multiplexing unit 20 of the optical line switching system 403 is different from the optical multiplexing unit 20 of FIG. 5 in that it includes two WDM couplers (a WDM coupler 21 and a WDM coupler 22).

  The optical line switching system 403 needs to multiplex the image light signal from the fiber amplifier 180 and the visible light from the visible light source 170. In the prior art of FIG. 1, the video light signal from the fiber amplifier is combined with the communication light from the relay amplifier and sent to the optical fiber side input / output device. Here, if the configuration is such that visible light is combined after the image light signal and the communication light are combined, the image light signal and the communication light pass through the multiplexer twice. If the multiplexer is a WDM coupler, since the WDM coupler has a loss of about 0.3 dB, for example, the communication light passes through the WDM coupler twice and is attenuated by about 0.6 dB.

  On the other hand, in the WDM coupler arrangement of the optical line switching system 403, the visible light and the video light signal are multiplexed by the WDM coupler 22, and then the communication light is multiplexed by the WDM coupler 21. With this arrangement, since the communication light passes only once through the WDM coupler, it can be suppressed to a loss of 0.3 dB. Note that the video light signal and the visible light pass through the WDM coupler twice, but the light from the fiber amplifier 180 is very strong (for example, 20 dBm), so that the loss of the WDM coupler twice is acceptable. The output of the visible light source is not particularly strong (for example, about 7 dBm), but it is sufficient if the scattering on the surface of the bent portion of the main optical fiber can be visually recognized in the optical fiber side input / output device 301. The loss of is acceptable.

[Other Embodiments]
The example of the optimum condition has been described above, but the present invention is not limited to this. In the embodiments described so far, visible light is continuously turned on by detecting downstream light and blinking by detecting upstream light. However, the present invention is not limited to this, and it may be distinguished by an appropriate different pattern, and two types of visible light sources are prepared. May be distinguished by color. The same applies to the sound source.

  In the above embodiment, the detection unit is described as being arranged in the relay amplifier unit, but the detection unit may be arranged in a detour path other than the relay amplifier unit. In addition, the relay amplifier unit, the visible light source, the WDM coupler, the speaker, and the fiber amplifier are described as separate devices, but the same effect can be exhibited even if they are all included in the same casing. The window material near the bent fiber may be either transparent or translucent as long as it transmits visible light. Alternatively, the light may be transmitted to another place by a transparent plastic waveguide or the like and emitted there.

  In short, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

[Appendix]
The following describes the optical line switching system of the present embodiment.
(the purpose)
It is an object of the present invention to provide an optical fiber side input / output device capable of performing a switching operation while confirming a communication state in real time by visible light and / or sound during a line switching operation.

  The optical fiber side input / output device according to the present invention makes visible light visible by making the vicinity of the probe fiber end transparent. When the optical line switching operation is successful, the visible light is combined with the detour path of the optical fiber side input / output device, the visible light is emitted from the tip of the probe fiber connected to the detour path, and is scattered on the side surface of the optical fiber. The operator determines the success of the optical line switching by checking the light scattered and emitted inside the optical fiber side input / output device.

According to the present invention, the following operational effects are exhibited.
(A) When visible light is input to a fiber that inputs / outputs light to / from the fiber bending portion inside the optical fiber side input / output device, the visible light is scattered on the surface of the bent fiber coating, and the optical fiber side By using a window that transmits light near the tip of the fiber in the case of the input / output device, the communication status can be expressed by lighting and blinking of visible light so that the operator can recognize the communication status without taking his gaze off. This has the effect of improving work efficiency.
(B) The communication status of the worker is more recognized when the surroundings are bright by generating sound in conjunction with the lighting and blinking of visible light by the light detection signal from the relay amplifier attached to the optical fiber side input / output device. There is an effect that becomes easy.
(C) The light for the video transmission service and the visible light are first combined, and then the GE-PON communication light is combined, thereby reducing the loss of the GE-PON communication light.

  In the optical fiber access network, a signal line can be input / output from the side surface of the optical fiber by forming a bend by sandwiching the working line during maintenance work of the optical fiber network. This technique can be used for monitoring the working line signal, inputting test light, switching the line, and the like.

10: Window 15: Bending part forming device 15a: Cylindrical block 15b: Transparent block 20: Optical multiplexing unit 21, 22: WDM coupler 30: Control unit (visible light source control unit)
40: sound source unit 41: sound source control unit 42: speaker 100: working line (main optical fiber)
150: Detour (probe fiber)
160: relay amplifier 161: OLT optical transceiver 162: ONU optical transceiver 163: downstream light detection unit 164: upstream light detection unit 170: visible light source 180: fiber amplifier 190: WDM coupler 301: optical fiber side input / output device 401-403: Optical line switching system

Claims (8)

A bending portion forming device for bending a main optical fiber through which communication light propagates to form a bending portion;
A probe fiber that inputs and outputs light to and from the main optical fiber through the bending portion, with a tip approaching the bending portion formed by the bending portion forming device on the main optical fiber;
A window through which the bent portion is visible from the outside;
Optical fiber side input / output device. An optical fiber side input / output device according to claim 1,
A visible light source unit that generates visible light as identification light;
An optical multiplexing unit that couples the identification light to the probe fiber so that the identification light from the visible light source unit is emitted from the tip of the probe fiber;
A detection unit for detecting a state of communication light propagating through the probe fiber;
A control unit that changes the state of the identification light to the visible light source unit according to the state of the communication light detected by the detection unit;
An optical line switching system comprising: The detection unit is incorporated, and further includes a relay amplifier unit that amplifies communication light propagating through the probe fiber,
The optical line switching system according to claim 2, wherein the detection unit detects a state of the communication light with communication light arriving at the relay amplifier unit. The state of the communication light detected by the detection unit is the presence or absence of the communication light, and the direction in which the communication light propagates,
The optical line switching system according to claim 2 or 3, wherein the state of the identification light that the control unit changes to the visible light source unit is continuous, blinking, and extinction. The state of the communication light detected by the detection unit is the presence or absence of the communication light, and the direction in which the communication light propagates,
The optical line switching system according to claim 2 or 3, wherein the state of the identification light that the control unit changes to the visible light source unit is a color change.   The optical line switching system according to claim 2, further comprising a sound source unit that generates sound according to the state of the communication light detected by the detection unit. The state of the communication light detected by the detection unit is the presence or absence of the communication light, and the direction in which the communication light propagates,
The optical line switching system according to claim 6, wherein the sound generated by the sound source unit is continuous sound, intermittent sound, and silence. The communication light is a video optical signal for video transmission service and other optical signals,
8. The optical line switching system according to claim 2, wherein the optical multiplexing unit combines the other optical signal after combining the identification light and the video light signal. 9.

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