JP3525524B2 - Optical information outlet for outdoor burial and outdoor information collection system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention serves as a manhole or a handhole (hereinafter referred to as a handhole) for connecting an optical cable which is used by being buried near an outdoor surface, and is dispersed in a wide area of public outdoor spaces such as roads, rivers and parks. When information such as video, audio, data, etc. is required, it is collected or monitored in the management facility through the optical fiber laid in these spaces, and when the information is needed from the management facility to the public space, the information is collected. The present invention relates to an optical information outlet for outdoor embedding used for the purpose of distribution or provision, and an outdoor information collecting system using the outlet.

[0002]

2. Description of the Related Art In recent years, operation management by remote monitoring or control of wide-area public facilities such as roads, rivers, dams, and coasts, disaster prevention management, transmission of management information, and storage of optical fiber core wires used by private telecommunications carriers, etc. Construction of a wide area optical cable network using space has begun. Since these public optical cable networks are long along the lines, high-density monitoring and public relations facilities (ITV cameras, lighting, sound collection microphones, various sensors, telephones, etc.) are available so that all information along the lines can be captured. A system has been devised to bring in and connect information such as bulletin boards, speakers, etc., and to collect information to the management office or distribute information from the management office. There is a need for optical information outlets to connect these monitoring and public relations devices to the optical cable network. Has occurred.

[0003]

[Problems to be solved by the invention] Optical information outlets are required for natural disasters and accidents such as earthquakes, typhoons, tsunamis, heavy snowfalls and fires, or for events and festivals, unlike permanent monitoring and public relations facilities that are always used. It is a facility that is temporarily used according to Further, it is extremely unlikely that a plurality of adjacent optical information outlets will be used at the same time. Therefore, the method of providing one optical fiber for each optical information outlet is not economically rational, and a method of performing optical transmission with a smaller number of fibers is required. In addition, since the frequency of use per location is low, the method of using a communication device or a multiplexing device requires pulling in a power line or installing a solar cell for each optical information outlet, which is economically rational. It will be lacking and a non-power supply method is desirable.

Further, an optical information network constructed on a river embankment, a road, a coastline, a railroad track, etc. is usually divided and managed by a jurisdiction management office under a management system composed of a plurality of layers, so that finally, The information collected or distributed by this optical information outlet will also be handled by the administrative offices under these jurisdictions as center stations. However, since the actual construction of the optical cable network will be carried out in stages over a long period of time, although optical information outlets were installed in stages, the line network with the control office in charge of the optical information outlet was opened. In some cases, there is a case where the system is not installed or reconstructed for the time being. Even in such a case, it would be economically unreasonable to leave the installed optical information outlet idle, and by performing transmission in the direction opposite to the original information transmission direction, it would Bipolar optical signals that can be used to perform information transmission (for example, gather information in a construction office upstream of the river for a while until the optical cable with the branch office under the jurisdiction of the river is opened) It should be an information outlet.

Further, it is not economically rational to install the optical information outlet for its own purpose, and it is desirable that it is also used as an optical cable connecting portion. For outdoor optical cable connection, generally, a construction method is used in which a manhole or a handhole is buried every 100 m to 2 km, an optical cable is drawn into the manhole or a handhole, and the optical cables are connected to each other using an airtight closure. In these manholes and handholes, vehicles and people may pass over them, so the upper lid surface is usually flush with the ground surface so that it does not obstruct traffic and is not subject to sabotage or mischief. It is installed so that. Therefore, even for optical information outlets that are also used as manholes and handholes, when not using ordinary optical information outlets, do not obstruct the passage of vehicles and people, and do not become a target of sabotage or mischief. The structure should be as free of protrusions from the surface as possible. However, roads, river banks, and railroad tracks where handheld optical information outlets are installed often become muddy passages during heavy rain or floods, and even a slight amount of rain submerges to a height of several mm to several cm from the ground surface. Even if you store the optical connector or the cable with optical connector in such an environment,
There was a problem that a high quality connection could not be made.

[0006]

In order to put the optical information outlet into practical use, it is necessary to overcome all the above-mentioned problems, and the present invention uses the optical information outlet for outdoor burying and the use thereof. An outdoor information gathering system is provided, which features (1) a main body of a handhole buried in the ground and its lid, (2) a linear connection and / or a branch between optical cables installed in the handhole and facing each other. (3) It is installed in a manhole or a handhole that tightly houses the connection parts to be connected, and the height of the uppermost part is usually 30 mm or less from the upper surface of the manhole or handhole, and 100 mm or more when stretched. At least one is closed at the bottom, at least one is provided with a handle for extending at the top, and at least one is at the manhole or handhold. (4) When the telescopic device is extended, the telescopic device is fixed to the lid and at least one of which is vertically slidable with respect to the main body of the manhole or handhole or its lid, and which is composed of a plurality of tubular bodies with different diameters. An optical connector adapter and an optical connector with a waterproof lid attached to the upper outer surface of the telescopic device exposed to the outside, the same as the outer surface, retracted from the surface, or provided with an opening / closing lid, (5) installed in the closure , 1 for each of the optical fiber cores that make up the opposing optical cable for connection in the closure
At least one optical branching device connected to the core and at least one of the remaining input and output ends being connected to a branching optical fiber core wire different from the optical fiber core wire, and (6) one end of the optical brancher And one or more connectors on the other end,
It is connected to the optical connector adapter on the top of the expander directly from the inside of the expander or through an optical attenuator and other optical element parts. At least part of itself is spirally or randomly meandered inside the expander. The present invention relates to an optical information outlet for outdoor embedding which is composed of the branched optical fiber core wire and an outdoor information collecting system using the same.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal sectional view of an optical information outlet for outdoor burying according to the present invention in a state where a telescopic device is stretched.
Is a top view. In the drawings, 1 is a handhole main body buried in the ground, 2 is its lid, 3 is a linear connection between optical cables 6 installed in the handhole main body 1, and / or
Alternatively, the closure 4 that hermetically accommodates the connection component for branch connection is an expansion / contraction device that is configured by concentrically combining metal cylindrical bodies having different diameters.

As shown in the drawing, for example, the expansion / contraction device 4 includes a first cylindrical body 41 having a bottom 44 sealed and an upper end fixed to the handhole body 1 or the lid 2 thereof, the first cylindrical body. A second member that is concentrically located inside the body 41 and has its lower end fixed to the bottom of the first tubular body 41 to seal the bottom and open the upper end.
Of the tubular body 42, the lower end of which is opened and is inserted between the first tubular body 41 and the second tubular body 42, and the upper end of the tubular body 42 is provided with a stretching handle 11 or a lifting operation device. Alternatively, the handhole main body 1 or its lid 2 can be operated by operating the lifting operation device.
The third cylindrical body 43 is slidably provided. And the top handhole cover 2
The height from the upper surface of the is 50 mm or less when contracted and 100 mm or more when stretched.

Reference numeral 5 is a branching optical cable for guiding the optical fiber core wire 9 branched by the optical branching device 7 to the expansion / contraction device 4, 6 is an optical cable for a trunk line such as pneumatic feeding for connecting handholes, and 7 is 2-input / 2-output branch ratio of the single mode optical fiber for branching and connecting the information collecting optical fiber core 8 and the branching optical fiber core 9 is 5 or more: 1
Optical branching device, 8 is a single-mode optical fiber core wire for collecting information used in the optical information outlet among the core wires in the optical cable 6, and 9 is an optical branching device 7 and an optical connector.
Two branch optical fiber cores that connect 13; 10 is an opening / closing lid provided on the upper outer surface of the expansion device 4 that is exposed to the outside when the expansion device 4 is stretched upward; and 11 is the upper end of the expansion device 4. A foldable extension handle attached to the, 12 is a portable optical cable with external connector 21 to this optical information outlet
Optical connector adapter provided with a waterproof and dustproof lid for connecting the optical connector, 13 is an optical connector for optical connection with the portable optical cable 21 having an external connector through the optical connector adapter 12, and 14 and 15 are inside the expansion device 4. Even if water enters the inside of the optical connector 13, the optical penetrating portion keeps the periphery of the optical connector 13 and the inside of the hand hole airtight. An optical fiber core wire protection pipe or an optical cable for securing an extra length of a wire. Reference numeral 22 is an optical modulator connected to an external portable optical cable with connector 21, and 23 is an ITV camera or the like.

FIG. 4 is a longitudinal sectional view of another embodiment of the telescopic device according to the present invention. FIG. 4 (a) is a storage state diagram and FIG. 4 (b).
Is a stretched state diagram. In the drawings, 51 is an outer cylinder for fixing whose bottom is sealed, 52 is an inner cylinder which is concentrically arranged inside the outer cylinder 51 and whose bottom is open. By operating the extension handle 62, the guide pin 54 mounted below the inner cylinder 52 slides on the guide rail 53 provided on the inner side surface of the outer cylinder 51 to move the outer cylinder 51.
The inside is slid upward to the state shown in FIG. Reference numeral 56 is an optical cable, 57 is a light penetrating portion, 58 is an optical fiber protection pipe that accommodates the optical fiber of the optical cable 56 and is spirally or randomly meandered, and 59 is an optical fiber attached to the upper end of the optical fiber. A connector, 60 is an optical connector adapter, 61 is a waterproof lid of the optical connector adapter 60, 62 is a handle or an elevating device for extending the inner cylinder 52, and 63 is a door that covers the upper part of the device.

FIG. 3 is a circuit diagram of a specific example of an outdoor information collecting system using the outdoor optical information outlet of the present invention. As shown in the drawing, outdoor optical information outlet 30
An end portion of the trunk optical cable 40 that connects a plurality of optical fiber cables is connected to an optical termination box 51 such as a management office 70. As mentioned above, the optical connector 13 of the outdoor optical information outlet 30
An external portable optical cable 21 with a connector is connected to the cable via an optical connector adapter, and an optical modulator 22 and an ITV camera 23 are provided at the end of the cable. Again
70 includes an optical termination box 71 of the trunk optical cable 40 and an optical demodulator 7
2, channel selector 73, TV monitor 74, speaker 75
Etc.

In the outdoor information collecting system as described above, when the length of the trunk optical cable is L, the number of information collecting and delivering optical fibers in the trunk optical cable is L / 10 (rounded down to the nearest whole number) to 2L / 5 (round up below the decimal point)
It is located between the cores, and the transportable optical cable has a screening tension of 1.8 kgf or more during drawing.
An optical cable with an outer diameter of 3.5 mm to 5.2 mm φ composed of a core only, an aromatic fiber, and an elastomeric sheath that covers these, and is fixed to both the tensile strength reinforcement and the sheath at both ends in a rigid manner, and The optical cable has only one optical connector that is not fixed to the fiber core. In addition, the optical modulator is a device that performs E / O conversion by performing pulse frequency modulation or pulse code modulation after multiplexing 1 ch of image information, 1 to 2 ch of audio information and 0 to 1 ch of digital data. It is a device that operates only with a DC power source of voltage.

[0013]

The optical information outlet of the present invention does not require a communication device or a multiplexing device to be installed on the terminal side in advance.
It is not necessary to pull in a power line or install a solar cell, and information can be collected and distributed from a plurality of outlets by using one optical fiber core. In addition, since two optical connectors that enable access to both the upstream and downstream directions can be used, information can be transmitted in both the upstream and downstream directions, or information can be received from both upstream and downstream directions, and the stage of constructing an optical cable network. In, even if some lines are not open, it is possible to send and receive information to the management office on the open side.

Furthermore, the optical information outlet of the present invention has an economical structure because it shares a housing with a cable connection manhole or handhole, which is indispensable for constructing an outdoor optical cable network. In normal times (when not using the optical information outlet), by storing the telescopic device in the manhole or handhole, it is possible to suppress the extension of the telescopic device from the surface of the ground to less than 30 mm. It is a safe structure that is not easily obstructed by traffic or subject to destructive work or mischief.
Even when submerged to a height of 10 cm or more, the height of the optical connector from the ground surface can be increased by stretching the expansion device.
Since it can be kept on the water surface by securing about 30 cm, high quality optical connector can be easily connected, and it is a highly practical structure that is useful in the event of a natural disaster.

The optical fiber core wire in the expansion / contraction device of the optical information outlet of the present invention is housed in a branching optical cable or / and a protective pipe which meanders spirally or randomly, and further, inside the expansion device and the hand. Since the inside of the hole and between the inside of the expansion device and the periphery of the optical connector are waterproofed by the optical penetration part, the expansion and contraction of the expansion device causes bending with an excessively small diameter to increase the transmission loss or increase the excess. It can be said that the structure has high reliability because tension is not applied to shorten the breaking life, and the optical fiber core does not directly contact water to shorten the breaking life. In addition, the branch optical cable penetrates the tubular body of the expansion / contraction device from the tangential direction,
Because it is fixed, the curvature of the branching optical fiber cable or branching optical fiber core wire protection pipe inside the expander does not become excessively small in the vicinity of this penetration part, and excessive bending occurs and transmission loss increases. And the breaking life is not shortened due to excessive tension.

[0016]

[Experimental example] An optical information outlet having the structure shown in Fig. 1 was prototyped. FRP is used for the handhole body 1, iron is used for the handhole cover 2, and the telescopic device 4 is divided into two parts.
The area on the side where was attached was reduced to semi-fixed, and the area on the other side was increased to allow removal. In addition,
The contact surface between the handhole body 1 and the lid 2 is rubber-packed to improve waterproofness. Closure 3 has an outer diameter of 170 mm
× A 690 mm long plastic airtight closure was used.

The expander / contractor 4 is constructed by concentrically combining five metal tubular bodies having different diameters. The outermost tubular body has an upper flange portion screwed to the handhole lid 2, and a bottom lid is airtightly attached to the bottom lid.
And the bottom of the fifth layer (innermost layer) is fixed, while the tubular body of the second layer from the outside has a folding handle 11 for extension and a key attached to the uppermost portion, and is provided below the tubular body. The cylindrical body of the fourth layer is attached via the airtight section provided, and is slidable up and down with respect to the outermost layer, the third layer, and the fifth layer. And the height from the top surface of the top hand hole is about 20 mm when stored and about 300 m when stretched.
A latch mechanism was provided between the outermost cylindrical body, the first layer, and the second layer so as to be locked by m 2.

The branch optical cable 5 includes a polyethylene pipe having an inner diameter of about 5 mm and an outer diameter of about 8 mm, and a LAP having an outer diameter of about 12 mm.
A sheathed pipe cable was used, and a 2-fiber single mode optical fiber unit 9 having an outer diameter of about 2 mm was housed in the pipe cable. The main optical fiber cable 6 is a 7-tube pneumatic optical fiber cable with 42 cores and an outer diameter of approximately 43 mm, which has a corrugated steel pipe armor with a corrosive anti-corrosion plastic coating. The optical branching device 7 has 3100 nm and 1550 nm 2 optical fibers. An SM type optical fiber for wavelengths having 2 input and 2 output branching ratio of 10: 1 was used. Of the optical fiber cores of the trunk optical cable 6, three single-mode optical fiber cores are used for information collection by the optical information outlet, and further, one of them is allocated for information collection 8 of the optical information outlet. It was

As the branching fiber core wire 9, two single mode type optical fiber core wires are coated to form a unit having an outer diameter of about 2 mm. Optical connector adapter 12 and optical connector 13
Two JIS F04 types were used for the above. A pipe connector made by PISCO is diverted to the optical penetrations of 14 and 15,
The optical fiber core protection pipe 16 has an inner diameter of about 6 mm and an outer diameter of about 8 mm.
A flexible polyethylene pneumatic pipe for air feeding is processed into a spiral shape, and 2 of the branching optical fiber core wire 9 is provided inside the pipe.
The cored optical fiber unit was stored.

The above-mentioned two optical information outlets were experimentally buried in the ground so that the maximum buried depth was 600 mm, and were connected in series to one trunk optical cable. Around the circumference of these two optical information outlets, sandbags were piled up in a circumferential shape with a height of about 20 cm to construct a bank, and water was injected into the sandbag circle to cover the ground surface of the optical information outlet with trees.

On the other hand, the information collecting optical fiber cores 8 at both ends of the trunk optical cable 6 pulled up to the ground outside the sandbag circle are each provided with a single mode type optical fiber core.
15km is fusion spliced, and the end on the opposite side of each optical fiber core wire is PSC modulation NTSC video 1ch, audio 1ch,
It was connected to an O / E (decoder) device of a 100 kpps data 1ch multiplex optical transmission system via a JISF01 type optical connector, and the video and audio output terminals of these devices were connected to a monitor CRT and a speaker, respectively. Also, prepare a commercially available 8 mm video camera and output its video and audio output by PFM.
Connected to the E / O (encoder) device of the multiplex optical transmission system of the modulation system NTSC video 1ch, audio 1ch, 100kpps data 1ch, and the optical output terminal of this device is equipped with JISF04 type optical connector at both ends. It was connected to a 5 mm, 500 m long, reel-wound single-mode single-core optical cable.

In this state, one of the two optical information outlets is extended by pulling the handle of the expansion / contraction device, the expansion / contraction device is opened, and the optical connector adapter is wound around the portable reel single mode type single core. When the optical connector at the other end of the optical cable was connected, it was confirmed that optical transmission of video and audio could be performed without any problems. In addition, return the retractable device to the retracted state in the reverse order, and then return the retractable device to the retracted state after performing the experiment of transmitting the image and sound for the other one optical information outlet with the retractable device being used in the same manner. It was

As a result of repeating the above-mentioned use / expansion of the expansion / contraction device of two optical information outlets and the optical transmission test of the image and the sound for 48 times, the optical transmission of the image and the sound can be transmitted without any problem. I confirmed that I could do it. After that, the area around the optical information outlet was dried, and then disassembled to observe the inside of the handhole, the inside of the closure, and the area around the optical connector adapter, and no water was observed.

[0024]

As described above, according to the optical information outlet for outdoor embedding of the present invention, since the manhole and the handhole, which are indispensable for constructing an outdoor optical cable network, are shared, there is no waste. In addition, there is no need to install a communication device or a multiplexing device in advance, there is no need to connect a power line or a solar cell, and information can be collected and distributed from multiple outlets using a single optical fiber. Therefore, it can be said that this is an information terminal station that is economical and has excellent maintainability.

Since information can be transmitted in both up / down directions or information can be received in both up / down directions,
Even if some of the lines are not open at the stage of building the optical cable network, information communication and reception can be performed to the management office on the open side, providing services from the beginning even in the long-term phased construction. it can. Therefore, by adopting the present invention, the development of wide-area optical information networks as infrastructure for outdoor public spaces such as roads, rivers, railways, lakes, dams, public facilities, and information provision services will be further accelerated in the future. It is considered to be a thing.

Further, the optical information outlet for outdoor burying of the present invention is not likely to be a target of destructive work or mischief by pressing the protrusion from the surface of the ground during normal operation, and is also subject to rainfall during use. Even if the surface of the earth is submerged in water, high-quality optical connection can be easily performed, so that the function can be exerted even under severe environmental conditions. Therefore, in the future, it will be possible to quickly and visually grasp the status of natural disasters and accidents such as earthquakes, fires, tsunamis, floods, and droughts, and provide information to the residents, which will be effective in realizing a society with high disaster prevention functions and improving local services. It is thought that it exerts.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an optical information outlet for outdoor embedding of the present invention in a state where a telescopic device is stretched.

FIG. 2 is a top view of the outdoor buried optical information outlet of FIG.

FIG. 3 is a circuit diagram of a specific example of an outdoor information collection system using the outdoor buried optical information outlet of the present invention.

FIG. 4 is a vertical cross-sectional view of another specific example of the expansion / contraction device according to the present invention, FIG. 4 (a) is a storage state view, and FIG. 4 (b) is a stretching state view.

[Explanation of symbols]

1 Handhole main body 2 Handhole lid 3 Closure 4 Expansion / contraction device 5 Branch optical cable 6 Trunk optical cable 7 Optical brancher 8 Optical fiber core for information collection 9 Optical fiber core for branch 10 Open / close lid 11 Handle 12 Optical connector adapter 13 Optical Connector 14 Light penetration part 15 Light penetration part 16 Optical fiber core wire protection pipe 17 Portable optical cable 18 Optical modulator 19 TV camera

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI H04B 10/14 (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 9/00-9/12 H02G 15/00 -15/34 H04B 10/00

Claims (4)

(57) [Claims] 1. An information input / output terminal station which is also used as a manhole or a handhole for connecting an optical cable to be used by being buried near an outdoor surface, and which is characterized by being configured by the following parts. Optical information outlet. (1) Manhole or handhole main body buried in the ground and its lid, (2) Sealed storage of connection parts installed in the manhole or handhole and performing linear connection and / or branch connection between two or more optical cables. Closure,
(3) It is installed in a manhole or a handhole, and the height of the uppermost part from the upper surface of the manhole or handhole is usually 50 mm or less, and when stretched it is 100 mm or more. One has a distraction handle attached to the top and at least one
The book is fixed to a manhole or a handhole cover, and at least one is a telescopic device composed of a combination of a plurality of tubular bodies with different diameters that can slide up and down with respect to the main body of the manhole or the handhole or its cover. An optical connector adapter and an optical connector with a waterproof lid, which is attached to the upper outer surface of the expansion / contraction device exposed to the outside when the device is extended, the same as the external surface, retractable from the surface, or provided with an opening / closing lid,
(5) Connected to each one of the optical fiber core wires that are installed in the closure and constitute the opposing optical cables that are connected in the closure, and at least one of the input and output ends that remains is the optical fiber core wire. At least one or more optical branching devices connected to another branching fiber core, (6) one end is connected to the optical branching device, and one or more connectors are attached to the other end, It is connected to the optical connector adapter directly from the inside of the expansion device or via an optical attenuator and other optical element parts, and at least part of itself is wired in a spiral or random meander inside the expansion device. Optical fiber core for branching. 2. The branch optical fiber core wire is processed into a branch optical fiber cable and / or is housed in a branch optical fiber core wire protection pipe, and the branch optical fiber core wire is provided from the bottom of the expansion device. 2. The optical information outlet for outdoor embedding according to claim 1, wherein the through portion for taking out is provided with the outer peripheral connecting direction of the expansion / contraction device tubular body as the through direction. 3. An optical branching device having one optical branching device and two optical connector adapters for each information collecting optical fiber core wire in an optical cable interconnected in a manhole or a handhole. Is a single-mode quartz optical fiber 2
A branching ratio of 5 or more for a 2 × 2 input / output configuration that connects the hearts:
In the case of one branching device, one optical fiber core wire for collecting information of both connected optical cables is connected to both ends of one core of the two cores that were connected before the connection of the optical branching device. Two branch optical fiber cores are connected to one branch device at both ends of the optical fiber, and the optical connectors at the ends of the branch optical fiber cores are respectively connected to the optical connector adapters. The optical information outlet for outdoor burying according to claim 1, wherein an optical transmission line can be selectively formed in one direction of the optical cables of both directions. 4. Two or more optical information outlets according to claim 3, one or more trunk optical cables connecting the optical information outlets,
1 or more optical cables for access, 1 or more optical modulators,
A system comprising one or more optical demodulators, one or more CCD cameras, and one or more TV monitors, wherein (1) L
Is the route length of the trunk optical cable, the number of information collection and distribution optical fibers in the trunk optical cable is from L / 10 (rounded down to the nearest decimal point) to 2L / 5 (rounded up to the nearest decimal point)
(2) The portable optical cable has only one effective number of optical fiber cores with a screening tension of 1.8 kgf or more at the time of drawing, and an outer sheath composed of aromatic fibers and an elastomeric sheath that covers them. An optical cable having a diameter of 3.5 to 5.2 mmφ, which is rigidly fixed to both the tensile strength reinforcing material and the jacket at both ends, and has only one optical connector which is not fixed to the optical fiber core wire, (3 A device for performing E / O conversion by performing pulse frequency modulation or pulse code modulation after the optical modulation device multiplexes 1 ch of image information, 1 to 2 ch of audio information, and 0 to 1 ch of digital data,
An outdoor information gathering system characterized by being operated only by DC power supplies of two or less voltages.