JP2004354408A - Large-sized optical amplifying and distributing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a large-sized optical amplifying and distributing apparatus saved in power consumption, low in cost and improved in construction and maintenance works by reducing its installation area and installation volume. <P>SOLUTION: The large-sized optical amplifying and distributing apparatus 10 has an optical amplifying unit 1 on which a multi-port EDFA (erbium-doped fiber amplifier) 1 (single input-multiple output type optical amplifier) having a single port input and high outputs of multiple ports is mounted. In the optical amplifying unit 1, four (minimum) to sixteen (maximum) sets of light splitter units 2 each of which is equipped with a single-core optical cord C with a one end connector can be provided on the input side. The number of the light distribution per each set of the light splitting units 2 is 32 or 64. Thus, the rationalization and high efficiency for space design, manufacture, management, application and the like in a rack 8 are attained. By these constitution, the number of sets of installation of the light splitter units 2 can be changed easily according to the the number of end users and the installation work, the extending work, the exchanging workor the like of the light splitter units 2 can be executed easily in the unit of an existing unit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a large-sized optical amplifying / distributing device installed at a transmission end or a relay end of an optical fiber transmission system for transmitting information to an end user by an optical fiber and distributing an input optical signal to a large number of output optical signals. The present invention provides a hardware technology that is extremely useful for constructing an FTTH (fiber-to-the-home) system.
Advanced forms of application to which the present invention is desired are not limited to a CATV distribution network for distributing general broadcast-type optical signals, and include, for example, "CATV facilities directly managed by local governments" described in Non-Patent Document 5 below. FTTH systems and the like, which are premised on advanced usage forms, such as "", are highly conceivable, and future or advanced use of the present invention can be expected.
[0002]
[Prior art]
[Non-patent document 1]
Nitto Kogyo Co., Ltd., "Nitto Kogyo Co., Ltd. [Information and Communication Product Guide]", [online], [Search on May 15, 2003], Internet <URL: http: // www. nito. co. jp / catalog / catalog_body01. html>
[Non-patent document 2]
Sankosha Co., Ltd., "Product Introduction: Optical Related: Wiring Board Related", [online], [searched May 8, 2003], Internet <URL: http: // www. sankosha. co. jp / product_n / new / opt_wiringing. html>
[Non-Patent Document 3]
Kawamura Electric Co., Ltd., “Optical distribution board”, [online], [searched on May 8, 2003], Internet <URL: http: // www. kawamura. co. jp / rack / lineup / hsj_hsju / main. html>
[Non-patent document 4]
TEM Co., Ltd., "Eribium fiber amplifier EAD / EAU series", [online], [searched on May 9, 2003], Internet <URL: http: // www. tem-inc. co. jp / html / frameset_maker. htm>
[Non-Patent Document 5]
Tohoku Bureau of Telecommunications, Ministry of Internal Affairs and Communications, “Tohoku Bureau of Telecommunications = Special Feature: Outlook for Advanced Use =”, [online], [Search August 22, 2002], Internet <URL: http: // www. ttb. go. jp / tetuduki / catv / usage / yatsuo. html>
[0003]
As conventional optical connection boxes, optical terminations, or optical distribution boards, there are, for example, those described in the above-mentioned non-patent documents 1 to 3 and the like. are doing.
However, the housings of these conventional devices do not include a single-port multi-port output high-output single-input multi-output optical amplifier (EDFA).
[0004]
FIG. 6 is a conceptual diagram showing a main configuration of a core device of a conventional optical amplification / distribution device configured using a conventional one-input one-output type optical amplifier (EDFA). This core device has two end users. ⁸ ~ 2 ¹⁰ Since it becomes very large when it reaches a certain degree or more, it has conventionally been manufactured as a separate device separate from a light-terminated frame composed mainly of an optical splitter.
That is, conventionally, such a core device is connected in series from the outside to the input side of an optical termination composed mainly of an optical splitter, so that a large-sized optical amplification / distribution device is practically constituted.
[0005]
In the conventional configuration of the core device (FIG. 6), an optical splitter is always required at the branching / distribution point of light. Therefore, for example, a one-input / one-output type optical amplifier (EDFA) is used for the core device of the optical amplification / distribution device. It is necessary to provide an optical splitter inside this core device (branch distribution point).
Particularly, when the output of the EDFA to be used is not high, or when the distribution and transmission performance of the optical splitter to be used is insufficient, these optical splitters and the EDFA are alternately assembled in a multi-stage configuration, and It is necessary to assemble a large-scale tree structure optical branching distribution circuit.
[0006]
[Problems to be solved by the invention]
In the optical amplifying / distributing apparatus having the above-described core equipment, the following problems necessarily occur.
(Problem 1) The hardware configuration related to the optical amplification / distribution circuit must be increased in size and complicated, and therefore, the installation area and the installation volume of the entire optical amplification / distribution device including the optical amplifier, the optical distributor, and the like. Becomes large.
[0007]
For example, when constructing an optical information distribution network based on the FTTH system, the demand for installing relay facilities such as sub-centers is increasing with the recent increase in the number of subscriber terminals. However, in a high-rise building or a high-rise house, the space for installing information equipment that can be allocated for such an optical amplification / distribution device or the like often has very strong restrictions. As long as the conventional configuration is followed, it is not always easy to take a rational construction form of the optical information distribution network.
Such a problem is particularly problematic in that the number of end users (the number of subscriber terminals) to be covered by one optical amplification and distribution device is two. ⁹ ~ 2 ¹⁰ When it reaches a certain degree, it can be a very serious problem.
[0008]
(Problem 2) If the physical structure of the optical amplifying / distributing device as described above is forcibly reduced in size, the extra space for storing the extra-length cord in a housing or a rack such as the optical amplifying / distributing device or the optical termination. When performing construction and maintenance work such as installation, expansion, and inspection, the workability has to be sacrificed instead of the downsizing, because the space required for the system becomes insufficient.
[0009]
In particular, when constructing a large-scale FTTH system, it is expected that the number of output wirings per optical amplifying / distributing apparatus is large. It may be difficult to carry out construction / maintenance work such as wiring connection, fusion, tidying, management, and inspection. Therefore, the greater the number of output wirings per optical amplification / distribution device, the greater the workability. The problem may be surfaced or revealed.
[0010]
The present invention has been made to solve the above problems, and an object of the present invention is to reduce an installation area and an installation volume of a large optical amplifier / distribution device required in the above-described subcenter or the like. .
A further object of the present invention is to contribute to power saving and low cost of the device.
A further object of the present invention is to improve the efficiency of construction and maintenance work such as installation, expansion, and maintenance of the device.
However, it is sufficient if each of the above-mentioned objects is achieved individually by at least one of the individual means of the present invention, and the individual invention of the present application solves all the above-mentioned problems simultaneously. It does not necessarily guarantee that a solution exists.
[0011]
Means for Solving the Problems, Functions and Effects of the Invention
In order to solve the above-mentioned problems, the following means are effective.
That is, the first means of the present invention is an optical terminal which is installed at a transmitting end or a relay end of an optical fiber transmission system for transmitting information by an optical fiber to an end user and distributes an input optical signal to a number of output optical signals. An optical amplification unit using a one-input multi-output optical amplifier for amplifying an optical signal input from one input port and distributing the amplified optical signal to a number of output ports; An optical splitter unit in which a plurality of optical splitters are provided, each of which receives and distributes a large number of optical signals, and one end of a plurality of output optical fibers α on the output side extending outside the optical termination. In one rack, a fusion tray for fusing n ends to n ends (n ≧ 1) with the other end of the optical fiber β to which one end is connected to the output end of the splitter unit may be provided. And
[0012]
FIG. 1 shows a conceptual diagram of the core technology (the one-input multi-output optical amplifier described above) according to the present invention. This optical amplifier (EDFA) embodies a high-output multi-port EDFA with a single-port input and a multi-port output. Such an optical amplifier (EDFA) is described in, for example, IPG (Non-Patent Document 4). It has been introduced as a product of the EAD / EAU series (IRE-POLUS GROUP) (: multi-port type amplifier), and is currently becoming popular.
[0013]
Since the conventional configuration of the optical amplification unit (the core equipment of the optical amplification and distribution device in FIG. 6) is difficult to reduce in size, the conventional configuration of the optical amplification unit is not limited to the conventional optical termination unit or the rack in the optical distribution board. However, if an optical amplifying unit using the above-described single-input / multi-output type optical amplifier is manufactured, such an optical amplifying unit can be significantly smaller than a conventional optical amplifying unit. Therefore, it can be easily arranged in a rack of an optical termination or an optical distribution board. Even in consideration of the number of parts, the price of parts, the power consumption, and the like, it is desirable to manufacture an optical amplification unit using the above-described single-input / multi-output optical amplifier.
That is, according to the above configuration, the installation area and the installation volume of the optical amplification / distribution apparatus can be made much smaller than before, and it can contribute to space saving, power saving, and cost reduction of the apparatus.
[0014]
According to a second aspect of the present invention, in the first aspect, each output port of the optical amplification unit is connected to an input end of each optical splitter unit by a single-core optical cord C having a single-ended connector. That is.
According to such a configuration, installation, extension, replacement, etc. of the optical splitter unit can be easily performed by attaching / detaching the connector provided at the end of the single-core optical cord C. Therefore, according to such a configuration, construction work such as installation, expansion, and replacement of the optical distribution device can be easily performed in units of the optical splitter unit.
[0015]
Further, according to the above configuration, even during the production of the optical splitter unit, the product inspection can be easily, mechanically or uniformly performed in units of this unit, so that there is no problem after the construction. Also hardly occurs.
[0016]
Further, the end of the single-core optical cord C with the one-end connector having no connector (the end on the side of the optical splitter unit) is fixed to the input end of each optical splitter unit. Operations such as managing and losing the single-core optical cord C may be reduced. Further, the fixing method may be arbitrary, and for example, a mechanical splice or the like may be used, or fusion may be performed.
[0017]
Further, the third means is the same as the first or second means, except that the output optical fiber cable A without a connector formed by assembling a large number of output optical fibers α and only one side formed by assembling a plurality of optical fibers β. A multi-core optical cord B with a single-end connector having a connector is provided, one end of the optical fiber β is connected to the output end of the optical splitter unit, and the other end of the optical fiber β is connected to one end of the output optical fiber α and the fusion tray. It is fusion.
[0018]
The number of wirings of the output optical fiber α and the optical fiber β is the same as the number of end users except for the spare arrangement, so that the number becomes very large. Above all, for the optical fiber β, it is necessary to accurately manage the corresponding relationship with each corresponding optical splitter unit, so that rationalization, efficiency, and space saving of operations such as handling, organizing, and managing are important.
[0019]
Therefore, a multi-core optical cord B with a single-end connector having a connector on only one side formed by assembling optical fibers β is introduced. According to such a configuration, since a large number of optical fibers β can be managed in units of a multi-core optical cord B with a single-ended connector, it is convenient for streamlining, organizing, managing, and other operations of the optical fiber β, streamlining efficiency, and saving space. Good.
[0020]
Further, the fourth means is the above-mentioned third means, wherein a group of tapes comprising a plurality of 8 m-core tape cords (m = 1, 2, 3, 4) is integrated into N pieces (2 ≦ N ≦ 8). The multi-core optical cord B with a one-end connector is formed from a pigtail-type fan cord formed by bundling with one tube or one conversion unit for each unit.
[0021]
According to such a configuration, the optical fiber β can be neatly arranged and organized in one relatively thin tube (or conversion unit) in units of 8 mN, so that the optical fiber β can be arranged, arranged, and managed. It is convenient for streamlining work, increasing efficiency, and saving space.
For example, if the maximum number of output wirings from one optical splitter unit is 64, and if mN = 8, this multi-core optical code B is used to place an optical fiber β in one relatively thin tube in units of 64. In addition, since it can be neatly organized and organized, just one optical fiber code B with one end connector can be assigned to each optical splitter unit.
In addition, by using the pigtail type, the fusing operation can be performed as it is, so that the working efficiency of the fusing operation is improved.
[0022]
Further, the fifth means is configured by combining the optical splitter unit in any one of the first to fourth means with a two-stage optical splitter of 16 distributions and an optical splitter of four distributions. That is to say, it is composed of 64 optical distributors.
For example, with such a configuration, a 64 distribution optical splitter unit can be manufactured from 16 distribution optical splitters and 4 distribution optical splitters that can be easily obtained or manufactured.
[0023]
In order to manufacture a small, stable output 64 splitter optical splitter (optical splitter unit) that is extremely easy to design, add, manage, maintain, etc., the output level, splitting transmission efficiency and current optical splitter and EDFA In view of the output performance and the power efficiency, etc., or in consideration of the size and unit price of each component, the above configuration is very advantageous. Of course, design, expansion, management, maintenance, and the like are easy even if a 32 distributor optical distributor is used.
[0024]
Conversely, when the splitter has a multi-stage configuration of three or more stages, the output performance of the optical splitter or the EDFA may not be able to catch up with the components used and the output level may be insufficient. Alternatively, there is a fear that the configuration becomes complicated and the miniaturization of the optical distributor fails. However, according to the above configuration, those concerns can be eliminated at the same time.
As an ideal configuration of the optical splitter unit that satisfies conditions such as miniaturization of the unit, sufficient output level, power saving, and price reduction, the following may be considered in addition to the above. Similarly, this can sufficiently contribute to space saving, power saving, cost reduction, and the like of the entire large optical amplification and distribution device.
[0025]
That is, a sixth means of the present invention is the light emitting device according to any one of the first to fourth means, wherein the optical splitter unit is a combination of a 32 split optical splitter and a 2 split optical splitter in two stages. That is to say, it is composed of 64 optical distributors configured as follows.
[0026]
According to a seventh aspect of the present invention, in any one of the first to fourth means, the optical splitter unit is a combination of a 16-split optical splitter and a 2-split optical splitter in two stages. That is to say, it is composed of a 32 distribution optical distributor.
[0027]
An eighth means is that the optical splitter unit in any one of the first to fourth means is constituted by an optical splitter of 32 distributions independently.
[0028]
According to a ninth aspect of the present invention, in any one of the first to eighth aspects, a unit row including a set of optical splitter units is formed, and the optical amplifying unit is located at substantially the center of the unit row. It is to be inserted and arranged.
[0029]
According to such a configuration, the standard deviation of the length of the optical wiring connecting the optical splitter unit and the optical amplification unit can be minimized in the rack of one large optical amplification and distribution device. When the optical wiring used in one large optical amplifier / distributor is uniformly manufactured, the length of the optical fiber required for the optical wiring can be minimized. Such a configuration is very important in uniformly manufacturing an optical splitter unit, particularly when the above-described optical wiring connecting the optical splitter unit and the optical amplification unit is configured as a part of the optical splitter unit. It will be advantageous.
[0030]
A tenth means is that, in any one of the first to ninth means, a unit row including a set of optical splitter units is provided on both the front side and the rear side in the rack.
[0031]
For example, by arranging about 8 to 16 optical splitter units for one optical amplification unit, one optical splitter unit has about 500 to about 1000 users (about 2 ⁹ ~ 2 ¹⁰ In the case of configuring a large-sized optical amplification / distribution apparatus that can cover a user), the volume of one optical amplification unit is approximately three times as large as the volume of one optical splitter unit (in consideration of the current general technical level). 1.5 to 4 times). Of course, such miniaturization of the optical amplification unit can be realized only by the first means of the present invention described above.
[0032]
On the other hand, regarding the optical splitter unit, there are the following requests in order to achieve both work efficiency such as construction work and inspection work and space efficiency.
(1) It is desirable to use a drawer format (tray format) that can be pulled out from the rack and occupy substantially the entire width of the apparatus for each drawer (one optical splitter unit).
(2) I want to increase the number of stacking stages of the drawer as much as possible. However, as a matter of course, the height of the installation space for the large optical amplifier / distributor is strongly restricted by the height of the floor on each floor of the building.
(3) In order to increase the working efficiency, the depth of one drawer (one optical splitter unit) cannot be too deep.
[0033]
In order to satisfy all of these requirements, the depth of the optical amplifying unit is set to about 2 to 3 times the depth of the optical splitter unit, and the optical splitter unit is used, as will be described more specifically in the embodiments described below. It is considered that a two-row configuration in which a total of two rows are arranged on both the front side and the rear side is most advantageous at least in improving space efficiency.
Further, when the workability is sufficiently considered, the following means are considered to be very effective.
[0034]
That is, an eleventh means is that, in the tenth means, a construction access port comprising a door, a sliding door, a foldable sliding door, a punching door or the like is provided on both the front side and the rear side of the rack. It is.
However, such a construction access port may be provided, for example, on the side of the housing. For example, if a means such as screwing a side panel (side cover) to the side surface of the housing is used, a detachable and useful simple construction access port is also provided on the side of the housing. Can be provided.
[0035]
When adopting a two-row configuration in which the optical splitter units are arranged in a total of two rows on both the front side and the back side, it is considered that a configuration in which a construction access port is provided only on the front side is of course not impossible depending on the device, By providing the construction access ports on both the front side and the rear side of the rack (the above-described eleventh means), the following operations and effects can be obtained.
[0036]
(1) The optical splitter unit can be very easily configured in the above-mentioned draw-out format. That is, the optical splitter units belonging to the unit row on the front side may be accessed by being pulled out from the construction access port on the front side, and the optical splitter units belonging to the unit row on the back side may be accessed by being pulled out from the construction access port on the back side. Just do it.
(2) Since access from both the front and back sides of the front side and the back side is simultaneously possible, work efficiency such as construction work and inspection work is improved. This effect becomes more remarkable when there are a plurality of workers or maintenance personnel who can be simultaneously involved in the construction work of the same large optical amplification and distribution device.
[0037]
According to a twelfth aspect, in the eleventh aspect, a fusion tray is provided on each of the front side and the rear side in the rack, so that the large optical amplifier / distribution apparatus can be mounted on either side of the front and back surfaces. And to perform the operation of fusing optical fibers in the fusion tray.
[0038]
Among the work related to the large optical amplifier / distributor, the work that requires the longest time is the work of fusing optical fibers in the fusion tray. In other words, increasing the efficiency of the fusion work of optical fibers is considered to be one of the biggest issues for optical communication companies (especially construction companies).
Therefore, according to such a configuration, even in the most time-consuming fusion work, access from both the front and back sides of the front side and the back side can be simultaneously performed. Work efficiency can be greatly improved.
By the means of the present invention described above, the above problems can be effectively or rationally solved.
[0039]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on specific examples. However, the present invention is not limited to the embodiments described below.
〔Example〕
As can be seen from FIGS. 2, 3, and 4, the features of the main components in the frame (the rack 8) of the large optical amplifier / distributor 100 of the present embodiment are as follows.
(1) A high-output multi-port EDFA1 (single-input multi-output optical amplifier) with single-port input and multi-port output is mounted. This multi-port EDFA 1 can have four or more, up to a maximum of 16 output ports. As such a high-output one-input multi-output optical amplifier, for example, one product of the EAD / EAU series of IPG (IRE-POLUS GROUP) introduced in the above-mentioned Non-Patent Document 4 (: multi-port type) Amplifier) and the like are available.
[0040]
(2) Provide four or more case modules (the optical splitter unit 2) provided with a single-core optical cord C with a single-ended connector on the input side (up to 16 modules). The number of light distributions for each of the optical splitter units 2 is set to 32 or 64, whereby the space design, manufacturing, management, operation and the like in the rack 8 can be rationalized and made more efficient.
[0041]
(3) In the extra space created by miniaturization of the single-input multi-output optical amplifier (: multi-port EDFA1) and each case module (: optical splitter unit 2), for example, useful for network monitoring, control, maintenance, etc. Other devices such as an optical transmitter and a status monitor can be installed and added.
Hereinafter, the large optical amplifier / distributor 100 of the present embodiment will be described in detail with reference to FIGS. 2, 3, 4, and 5. FIG.
[0042]
FIG. 2 is a functional block diagram schematically illustrating a main configuration of the large-sized optical amplification and distribution device 100 according to the embodiment of the present invention. The multi-port EDFA 1 shown in FIG. 2 is composed of a single-output multi-output high-output single-input multi-output optical amplifier capable of outputting up to 16 ports.
The optical splitter unit 2 includes 64 optical fiber connectors 3, and the same number of optical fibers f are provided as standard from the factory. The optical splitter unit 2 is equipped with a single-core optical cord C with a one-end connector as a standard from the factory shipment. An optical core connector 2a is provided at the tip of the single-core optical cord C. Up to 16 optical splitter units 2 can be connected to the multi-port EDFA 1 via the optical fiber cable connector 2a. On the input side of the multi-port EDFA 1, a connector 1a is provided, to which a single optical fiber D constituting a part of the input optical wiring to the large optical amplifier / distributor 100 is connected. I have. The input end of the optical fiber D itself is fused to the input optical wiring γ on the further upstream side on the fusion tray 4 (FIG. 4).
[0043]
With such a configuration, the following effects can be obtained.
(A) The number of installed optical splitter units 2 can be easily changed according to the number of end users (the number of subscriber terminals).
(B) The installation, extension, and replacement of the optical splitter unit 2 can be easily performed in units of ready-made units by attaching and detaching the connector 2a of the single-core optical cord C.
[0044]
FIG. 3 shows a plan view (a) and a front view (b) schematically showing the physical configuration of the optical splitter unit 2 included in the large-sized optical amplification and distribution device 100.
The input end (upstream side) of the single-core optical fiber f 'located on the input side of the optical splitter 21 is fused to the output end (downstream side) of the single-core optical code C itself.
The optical splitter 21 is an optical splitter of two distributions, and the optical splitters 22a and 22b are optical splitters of 32 distributions respectively. Although only five optical output wirings (single-core optical fiber f) from the optical splitter 22a and five optical output wirings from the optical splitter 22b are shown in FIG. Each of the optical splitters (22a, 22b) has 32 optical output wirings extending therefrom.
[0045]
The optical fiber connector 3 shown in FIG. 3B is arranged in each of 32 upper and lower stages, and the optical output signal from the optical splitter 22a is transmitted to the upper optical fiber connector by the above configuration. 3, the optical output signal from the optical splitter 22b is distributed to each lower optical fiber connector 3.
[0046]
FIG. 4 shows a front view (a) and a side view (b) schematically showing the physical configuration inside the rack 8 of the large optical amplifier / distributor 100 of the present embodiment. The rack 8 is provided with a total of four equipment mounting columns 7 running in the vertical direction, and each device / equipment is directly or indirectly supported by the equipment mounting columns 7. A total of five cable clamps 6 are prepared, and up to five output optical fiber cables A can be fixed.
[0047]
On the two device mounting columns 7 on the front side, a total of eight optical splitter units 2 are arranged in one vertical line. Hereinafter, this row is referred to as a unit row on the front side. A similar unit row (unit row on the back side) is also installed on the back side.
Each of these optical splitter units 2 has the same specifications, and the length of the single-core optical cord C with one end connector is manufactured to be the same. The optical amplifying unit 1 is inserted and disposed at substantially the center of the unit row on the front side. With this configuration, the length of the single-core optical cord C of each optical splitter unit 2 that is uniformly manufactured is a necessary minimum. Has been suppressed to a minimum.
[0048]
Usually, the total number of the fusion trays 4 is equal to the total number of the optical splitter units 2. Therefore, for example, when 16 optical splitter units 2 are prepared (when fully equipped), 16 fusion trays 4 are naturally mounted.
Each fusion tray 4 has a one-to-one correspondence with each optical splitter unit 2. Of course, this fusion tray 4 has one end of an optical fiber β connected to the output end of each optical splitter unit 2 and an output optical fiber. It is used to fuse the output optical fiber α constituting the cable A with one end at the fusion point P.
[0049]
In the rack 8 of FIG. 4, a total of 12 fusion trays 4 are prepared above the unit rows on the front side. The lower four rows of unit rows on the rear side are provided with four unit cases 2 '(dummy cases without a main body) in a spare area for expansion. That is, the optical splitter unit 2 having the optical splitter of FIG. 3 is not actually installed at this position.
[0050]
For example, when the optical splitter unit 2 is not fully equipped as described above, a dummy case (unit case 2 ') without such a main body may be used. In the configuration example of FIG. 4, the optical splitter unit 2 having the optical splitter of FIG. 3 is provided with a total of 12 optical splitter units, 8 in the unit row on the front side and 4 in the unit row on the back side. Also in this case, the total number of the fusion trays 4 matches the total number of the optical splitter units 2.
[0051]
It should be noted that a space in which the fusion tray 4 can be arranged is also left above the unit row on the rear side in FIG. Therefore, the fusion tray 4 corresponding to each of the optical splitter units 2 on the rear side may be provided here.
[0052]
For example, when the total number of the optical splitter units 2 in FIG. 4 is increased to 16 units (fully equipped), eight fusion trays 4 are provided on each of the front and back sides, and each of the fusion trays 4 is provided above each unit row for each unit row. And good. According to such a configuration, it is easy to use the unit row on the front side for CATV optical signal distribution to the area A and use the unit row on the rear side for CATV optical signal distribution to another area B. And the configuration is easy to understand.
[0053]
Although not shown, so-called double doors are provided on both the front and back sides of the front and back sides, respectively. In some cases, the work efficiency of various construction and inspection works, such as the above, may be significantly improved. The above-described proper use of the unit rows on the front side and the back side for each application is particularly important for further improving work efficiency in such a configuration.
[0054]
FIG. 5 is a perspective view (a) of one section of an eight-core optical fiber tape core t composed of eight optical fibers β, and a thin and neatly bundled tube T containing eight tape cores t. It is a perspective view (b) of one section of multicore optical cord B with one end connector. The thickness d of the tape core wire t is about 0.9 mm, and the diameter L of the tube T is about 10 mm.
For example, in this way, by arranging only the required number of tape core wires in the tube T and organizing them, the external dimensions of the multi-core optical cord B with a single-end connector constituted by integrating 64 optical fibers β in FIG. Can be very small.
[0055]
Therefore, according to such a configuration, it is convenient for streamlining, efficiency, and space saving of operations such as routing, arrangement, and management of the optical fiber β. Further, according to such a configuration, just one multi-core optical code B with a single-ended connector can be assigned to each optical splitter unit.
[0056]
Further, since the multi-core optical cord B with one-end connector is of a pigtail type in which one end of the optical fiber is exposed, the fusion operation can be performed as it is, so that the operation efficiency of the fusion operation is improved. In particular, as shown in FIG. 5, when the eight-core tape is bundled at a time, the fusion work can be carried out for each eight-core tape unit on the fusion tray capable of simultaneously fusing eight cores. The fusing operation can be performed extremely efficiently.
[0057]
It can be seen that the following effects are all obtained by the configuration of the large optical amplifier / distributor 100 as described above, for example, based on the present invention.
(1) The installation area and installation volume of the optical amplification / distribution device required in a sub center such as an optical distribution network can be reduced.
(2) Power saving and price reduction of the device can be achieved.
(3) The efficiency of installation / maintenance work such as installation, expansion, and maintenance of the device can be improved.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a core technology according to the present invention.
FIG. 2 is a functional block diagram schematically illustrating a main configuration of a large-sized optical amplification and distribution device 100 according to the embodiment of the present invention.
FIGS. 3A and 3B are a plan view and a front view schematically showing a physical configuration of an optical splitter unit 2 provided in the large-sized optical amplification / distribution apparatus 100. FIGS.
FIGS. 4A and 4B are a front view (a) and a side view (b) schematically showing a physical configuration inside a rack 8 of the large optical amplifier / distributor 100. FIG.
FIG. 5 is a perspective view (a) of one section of an eight-core optical fiber tape core t composed of eight optical fibers β, and one end of a multi-core optical cord B having a single-ended connector having the tape core t; Sectional perspective view (b).
FIG. 6 is a conceptual diagram showing a core device configuration of a conventional optical amplifying device configured using a conventional one-input one-output type optical amplifier (EDFA).
[Explanation of symbols]
100… Large-scale optical amplification and distribution equipment
1. Multi-port EDFA (single-input multi-output optical amplifier)
2 ... Optical splitter unit
2a Optical fiber connector
21… Optical splitter (2 distribution)
22a,
22b Optical splitter (32 distribution)
3 Optical fiber connector
4 ... fusing tray
6 Cable clamp
7… Equipment mounting column
8 ... Rack
A: Output optical fiber cable
α… output optical fiber
B: Multi-core optical cord with one end connector
β ... Optical fiber connected to the output end of the optical splitter unit
C: Single core optical cord with one end connector
P… fusion point
T… tube
t ... 8-core optical fiber ribbon

Claims (12)

In an optical termination that is installed at a transmission end or a relay end of an optical fiber transmission system that transmits information by an optical fiber to an end user and distributes an input optical signal to a number of output optical signals,
An optical amplification unit using a one-input multiple-output optical amplifier that amplifies an optical signal input from one input port and distributes the amplified optical signal to a plurality of output ports;
Each optical signal output from the optical amplifying unit, respectively, each input, an optical splitter unit provided with a number of optical splitters to distribute to a number of optical signals,
One end of a number of output optical fibers α on the output side extending outside the optical termination frame and the other end of an optical fiber β to which one is connected to the output end of the optical splitter unit are n-core pairs. A large-sized optical amplification / distribution apparatus, wherein a fusion tray for fusion with n cores (n ≧ 1) is provided in one rack. The large-sized optical amplifier / distributor according to claim 1, wherein each output port of the optical amplifier unit and an input terminal of each optical splitter unit are connected by a single-core optical cord C having a single-ended connector. apparatus. An output optical fiber cable A without a connector, comprising a number of the output optical fibers α;
A multi-core optical cord B with a single-end connector having a connector on only one side, comprising a plurality of the optical fibers β aggregated,
One end of the optical fiber β is connected to the output end of the optical splitter unit by a connector,
3. The large-sized optical amplification and distribution device according to claim 1, wherein the other end of the optical fiber β is fused to one end of the output optical fiber α in the fusion tray. 4. The multi-core optical cord B with a single-end connector is composed of N (2 ≦ N ≦ 8) tape groups each including a plurality of 8 m-core tape cords (m = 1, 2, 3, 4). 4. The large-sized optical amplification / distribution apparatus according to claim 3, wherein the apparatus is constituted by a pigtail type fan cord formed by bundling with one tube or one conversion unit. 5. The optical splitter unit according to claim 1, wherein the optical splitter unit includes a 64 split optical splitter configured by combining a 16 split optical splitter and a 4 split optical splitter in two stages. 6. 2. The large-sized optical amplifier / distributor according to claim 1. 5. The optical splitter unit according to claim 1, wherein the optical splitter unit includes a 64 split optical splitter configured by combining a 32 split optical splitter and a 2 split optical splitter in two stages. 6. 2. The large-sized optical amplifier / distributor according to claim 1. 5. The optical splitter unit according to claim 1, wherein the optical splitter unit comprises a 32 split optical splitter configured by combining a 16 split optical splitter and a 2 split optical splitter in two stages. 6. 2. The large-sized optical amplifier / distributor according to claim 1. The large-sized optical amplifier / distributor according to any one of claims 1 to 4, wherein the optical splitter unit comprises a 32 split optical splitter. 9. The optical system according to claim 1, further comprising a unit row including a set of the optical splitter units, wherein the optical amplifying unit is inserted and arranged substantially at the center of the unit row. 10. The large-sized optical amplification / distribution device according to the above. On both the front side and the back side in the rack,
The large-sized optical amplifier / distributor according to any one of claims 1 to 9, further comprising a unit row including a set of the optical splitter units. The large-sized optical amplification / distribution apparatus according to claim 10, wherein the rack has a construction access port formed of a door, a slide door, a foldable slide door, a punching door, or the like on both front and rear sides. . By providing the fusion trays on both the front side and the rear side in the rack, the fusion work of the optical fibers in the fusion tray can be performed from both the front and back sides of the large optical amplification and distribution device. The large-sized optical amplification / distribution apparatus according to claim 11, wherein the apparatus can be used.

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