JP5330752B2 - Optical fiber storage method and optical fiber device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of storing a plurality of optical fibers in higher density and in a compact form and to provide a compact optical fiber device which stores the plurality of optical fibers in high density. <P>SOLUTION: The method of storing the plurality of optical fibers is provided by which a first wound bundle in which a first optical fiber is wound and bundled is arranged in a storage body and a second wound bundle in which a second optical fiber is wound and bundled with an inner diameter larger than the outer diameter of the first wound bundle is arranged so as to enclose the outer circumference of the first wound bundle. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an optical fiber storage method for storing a plurality of optical fibers and an optical fiber device storing a plurality of optical fibers.

  Conventionally, in the field of optical fiber communication, when optical pulse signals are time-division multiplexed or interference between optical pulse signals is prevented, it is necessary to adjust the phase or timing between the optical pulse signals. is there. As a method for adjusting the timing, there is a method using a delay line made of an optical fiber (for example, see Patent Documents 1 and 2). In this method, when each of a plurality of optical pulse signals is input to optical fibers having different lengths, for example, a difference occurs in the propagation time of each optical pulse signal due to the difference in length of each optical fiber. The timing of each optical pulse signal can be adjusted.

JP 2004-272117 A JP 2005-303625 A

  By the way, as the communication capacity increases, the number of optical pulse signals used increases, so the number of light source devices and light receiving devices also increases, and the number of optical fibers for timing adjustment also increases. A huge storage space is required due to the effect. Therefore, more compact storage is required for each device and optical fiber.

  The present invention has been made in view of the above, and an optical fiber storage method capable of storing a plurality of optical fibers more densely and compactly, and a small-sized optical fiber device storing a plurality of optical fibers at a high density. The purpose is to provide.

  In order to solve the above-described problems and achieve the object, an optical fiber storage method according to the present invention is an optical fiber storage method for storing a plurality of optical fibers, in which the first optical fibers are wound. A second winding bundle in which the first winding bundle is arranged in the housing and the second optical fiber is wound with an inner diameter larger than the outer diameter of the first winding bundle is used as an outer periphery of the first winding bundle. It arrange | positions so that may be enclosed.

Further, in the optical fiber housing method according to the present invention, in the above invention, an inner diameter of the first winding bundle is D [mm], a cross-sectional diameter of the first winding bundle is D _B [mm], The outer diameter including the coating of the first optical fiber is D _C [mm], the filling factor parameter of the cross section of the first optical fiber in the cross section of the first bundle is P, and the first optical fiber when the length as L [m], wherein D _B is to saw the following formulas (1) to (3), the inner diameter D ₂ [mm] of the second winding bundle, the following equation (4) The optical fiber storage method according to claim 1, wherein the optical fiber is stored.
D _B = 10 × (D _C ² × n × P ⁻¹ ) ^0.5 (1)
P> 60 (2)
n = 1000 × L / (πD) (3)
D ₂ − (D + D _B × 2)> 0 (4)

The optical fiber storage method according to the present invention is the above-described invention, wherein the winding diameter of each of the bundles of the bundle holding member inserted between the first bundle and the second bundle is the above-described invention. 3. The optical fiber housing method according to claim 2, wherein when the total thickness in the direction is t [mm], D ₂ satisfies the following formula (4a).
D ₂ − (D + D _B × 2 + t)> 0 (4a)

  Further, in the optical fiber storing method according to the present invention, in the above invention, the lengths of the first and second optical fibers are set so that the cross-sectional diameters of the first and second bundles are substantially the same. In addition, an inner diameter of the first and second winding bundles is set.

  An optical fiber device according to the present invention includes a plurality of optical fibers accommodated according to any one of the above inventions.

  The optical fiber device according to the present invention is characterized in that, in the above invention, the plurality of optical fibers have different light propagation times at a predetermined wavelength.

  In the optical fiber device according to the present invention as set forth in the invention described above, the plurality of optical fibers have different zero dispersion wavelengths.

  In the optical fiber device according to the present invention as set forth in the invention described above, the plurality of optical fibers have different lengths.

  According to the present invention, there is an effect that a plurality of optical fibers can be stored more densely and compactly.

  Embodiments of an optical fiber housing method and an optical fiber device according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a perspective view schematically showing the appearance of the optical fiber device according to Embodiment 1 of the present invention. As shown in FIG. 1, the optical fiber device 100 includes a housing front surface portion 101, a housing upper surface portion 102, a housing side surface portion 103, and a housing that opposes the housing front surface portion 101 constituting the housing. It has a back surface portion 104, a housing bottom surface portion 105 facing the housing top surface portion 102, and a housing side surface portion 106 facing the housing side surface portion 103. The housing front face 101 is provided with 64 optical connector connection adapters A arranged in 8 × 8 rows. Each connection adapter A can connect two optical connectors on one side.

  Next, FIG. 2 is a side view schematically showing the internal configuration of the optical fiber device 100 as viewed from the housing side surface 103 side. FIG. 3 is a plan view schematically showing the internal configuration of the optical fiber device 100 as viewed from the housing upper surface 102 side. As shown in FIGS. 2 and 3, a plurality of winding bundles 10 to 40 are accommodated in the optical fiber device 100. Each of the plurality of winding bundles 10 to 40 is mounted on mounting plates 107 to 110 fixed to the case side surfaces 103 and 106, respectively. Each of the plurality of winding bundles 10 to 40 is composed of standard single mode optical fibers having a clad diameter of 0.125 mm, an outer diameter including a coating of 0.25 mm, and different lengths.

Next, the plurality of winding bundles 10 to 40 will be described, but since all have the same structure, the plurality of winding bundles 10 will be specifically described below. The plurality of winding bundles 10 have a structure in which optical fiber winding bundles arranged in a substantially concentric manner are laminated in two layers. For example, in the upper layer of the plurality of winding bundles 10, the winding bundles 11a to 18a are arranged substantially concentrically in order from the inside. That is, the upper layer of the plurality of winding bundles 10 is formed by sequentially performing the process of arranging the winding bundle 12a having an inner diameter larger than the outer diameter of the winding bundle 11a so as to surround the outer periphery of the winding bundle 11a. It is stored in.
Similarly, in the lower layer of the plurality of winding bundles 10, winding bundles 11b to 18b, which will be described later, are arranged substantially concentrically from the inside.

  Further, optical connectors C such as SC connectors are attached to both ends of the optical fiber constituting each winding bundle, and are connected to the connection adapter A, respectively. Note that two optical connectors C attached to optical fibers constituting the same winding bundle are connected to the same connection adapter A.

  In addition, each of the winding bundles constituting the plurality of winding bundles 10 is held by four holding jigs H arranged at 90 ° intervals around the center of each winding bundle. FIG. 4 is a cross-sectional view schematically showing a cross section taken along line XX in FIG. The holding jig H is made of, for example, polyacetal, and includes three cuboid plate holding members H1 and 18 cuboid plate holding members H2. Nine rectangular grooves G are formed in each plate-like holding member H1 along the short side direction of the main surface. The holding jig H has a structure in which the plate-like holding member H2 is fitted in each groove G of the plate-like holding member H1, and is laminated in two layers. It is fixed with an agent. The holding jig H holds the upper-layer winding bundles 11a to 18a and the lower-layer winding bundles 11b to 18b in each rectangular tube-like space formed by the plate-like holding members H1 and H2. Each wound bundle can be formed by a known bundle winder that winds an optical fiber around a bobbin and then removes the bobbin to form a wound bundle. Usually, a bundler has a structure in which a part or the whole of a portion around which an optical fiber is wound is movable in the diameter direction of the winding of the optical fiber. When bundling optical fibers, the movable part is first fixed and the fiber is wound. After the optical fiber is wound, the portion around which the optical fiber is wound is moved in the direction in which the diameter of the wound optical fiber is reduced, and the bundler is removed while the wound optical fiber is loosened. The cross-sectional shape of the wound bundle immediately after bundling by the bundling device is a shape close to a rectangle with the short side of the radial direction of the winding bundle. Further, the cross-sectional shape is made substantially circular by winding a fixing tape around several places of the winding bundle and fixing the winding bundle. Thereby, as shown in FIG. 4, each winding bundle 11a-18a, 11b-18b is formed so that the cross section may become substantially circular. By using this holding jig H, each winding bundle can be stably held, and a stable storage state can be realized even when the winding bundles are stacked. In addition, as the fixing tape, a resin tape, for example, a JIS K6885 sealing tetrafluoroethylene resin unfired tape can be used.

  Next, a method of using the optical fiber device 100 will be described. First, two optical connectors are connected to a predetermined connection adapter A from the outside of the optical fiber device 100. Next, an optical pulse signal having a wavelength of 900 to 1700 nm, for example, is input from one optical connector. As described above, each connection adapter A is connected to a standard single mode optical fiber having a different length, so that it corresponds to the length and chromatic dispersion of the single mode optical fiber connected to the connection adapter A. The propagation time delay is given to the optical pulse signal, and the optical pulse signal whose timing is adjusted is output from the other optical connector.

  Next, the length of the optical fiber constituting each winding bundle and the inner diameter of the winding bundle will be described. FIG. 5 is a diagram showing the length of the optical fiber constituting each winding bundle housed in the optical fiber device 100 shown in FIG. 1, the inner diameter of the winding bundle, and the diameter of the cross section. As shown in FIG. 5, in the optical fiber device 100, optical fibers having a length of 8 to 8 m and a length of 512 m are accommodated in a bundle of inner diameters of 60 to 20 mm and an inner diameter of 200 mm. In addition, each number in FIG. 5 has shown the arrangement | positioning position of a winding bundle, and number "XY" is a Yth from the top among the laminated | stacked winding bundles in FIG. Show. That is, the number “1-1” indicates the winding bundle 11a in FIG. 3, and the number “8-2” indicates the winding bundle 18b in FIG. In addition, since the minimum value of the inner diameter of the wound bundle is set to 60 mm, in the standard single mode optical fiber used, strain due to bending is suppressed to an allowable range, and thus breakage and the like are prevented.

  Therefore, for example, the combinations of the lengths and inner diameters of the optical fibers of the bundles 11a to 18a constituting the upper layer of the plurality of bundles 10 are (8 m, 60 mm), (72 m, 80 mm), (136 m, 100 mm), (200 m), respectively. , 120 mm), (264 m, 140 mm), (328 m, 160 mm), (392 m, 180 mm), (456 m, 200 mm).

  Thus, by setting the length and the inner diameter of the optical fibers of the bundles 11a to 18a, the bundles 11a to 18a can be stored in a concentric and compact manner. At this time, the height, which is the diameter of the cross section of each of the bundles 11a to 18a, is lower in the optical fiber having a shorter length as shown in FIG. This is the result of selecting the inner diameter of the winding bundle for storing in the most dense and compact manner, and by selecting the inner diameter of the winding bundle so that the height changes according to the length of the optical fiber in this way, Highest density and compact storage are possible. As a result, the optical fiber device 100 is a small device that accommodates a plurality of optical fibers in a high density and compact manner. Further, among the winding bundles 11a to 18a, the winding bundles with numbers “5-1” to “8-1” corresponding to the winding bundles 15a to 18a have a diameter of 7.6 to 8.4 mm and a difference of 10 % Are almost the same, and are stored at a particularly high density.

Here, the length of the optical fiber and the inner diameter of the winding bundle can be set as follows. FIG. 6 is an explanatory diagram for explaining the setting of the length of the optical fiber and the inner diameter of the bundle. Hereinafter, as shown in FIG. 6, illustrating the inner diameter of the first winding bundle B D, the diameter of the cross-section of the wound bundle as D _B.

First, D _B [mm] can be calculated by the following equations (1) to (3).
D _B = 10 × (D _C ² × n × P ⁻¹ ) ^0.5 (1)
P> 60 (2)
n = 1000 × L / (πD) (3)
However, D _C [mm] is the outer diameter including the coating of the optical fiber. L [m] is the length of the optical fiber. P is a filling factor parameter of the cross section of the optical fiber in the cross section of the bundle, and is expressed by (cross section of the optical fiber × number of optical fibers included in the cross section of the bundle) / (cross section of the bundle) × 100. Defined. Although the filling factor parameter varies depending on the outer diameter and processing conditions of the optical fiber, if it is approximately 60 to 95, the optical fiber is not stressed and can be a high-density bundle, more preferably 65 to 80. Degree.
The outer diameter of the optical fiber is, for example, 0.06 to 0.25 mm.

When the diameter D _B of the cross section of the winding bundle calculated by the equations (1) to (3) is used, the outer diameter of the winding bundle B is represented by D + D _B × 2. Therefore, if the inner diameter of the second winding bundle disposed so as to surround the outer periphery of the first winding bundle B is D ₂ [mm], D ₂ may be set so as to satisfy the following expression (4). .
D ₂ − (D + D _B × 2)> 0 (4)

In the case of the first embodiment, it is necessary to set a large holding jig plate holding member by the thickness of the two sheets further D ₂ of the H2 of H to be interposed between the winding bundle. For example, if the thickness of the plate-like holding member H2 is 2 mm, the total thickness of the plate-like holding member H2 is 4 mm. Therefore, t [mm] is set to 4 mm, and in addition to the equation (4), the following equation ( it may be set _{D 2} so as to satisfy the 4a).
D ₂ − (D + D _B × 2 + t)> 0 (4a)

Further, by forming the second wound bundle optical fiber of the second winding bundles of cross-sectional diameter substantially D _B equal to become such a length of the first winding bundle B and the second winding bundle The height can be made almost uniform. Further, the inner diameter of the winding bundle arranged further outside the second winding bundle can be calculated using the above formulas (1) to (4) and (4a).

  In the first embodiment, each of the plurality of winding bundles 10 to 40 is placed and stored on the mounting plates 107 to 110, respectively. However, the present invention is not limited to this, and each of the plurality of winding bundles 10 is stored. You may store so that the holding jig used for ~ 40 may be laminated | stacked.

  Further, the plurality of optical fibers stored by the storing method according to the present invention is not limited to the combination in the case of the first embodiment shown in FIG. 5, and may be as follows. 7 to 9 are diagrams showing another example of the lengths of the plurality of optical fibers and the inner diameter of the bundle bundle that are accommodated by the accommodation method according to the present invention.

In the example shown in FIG. 7, the lengths of the optical fibers having the numbers “1” to “8” to be stored are different as in the case of the first embodiment. Here, the outer diameter D _C [mm] including the coating of the optical fiber is 0.25 mm. Then, the inner diameter of the bundle of optical fibers with the shortest number “1” was made the smallest, and the optical fibers after the number “2” were calculated using equations (1) to (4) and (4a). A plurality of optical fibers can be accommodated in a compact manner by concentrically arranging them as a bundle of inner diameters. Here, in the example shown in FIG.

Also in the example shown in FIG. 8, the inner diameters of the optical fiber bundles of numbers “1” to “8” to be stored are calculated using the equations (1) to (4) and (4a). Here, the filling rate parameter P was set to 65. However, the length of each optical fiber is the same 100 m, and each optical fiber is a highly nonlinear optical fiber having an effective core area smaller than that of a standard single mode optical fiber having a core diameter of about 9 to 10 μm. And the zero dispersion wavelengths are different from each other. Here, the outer diameter D _C [mm] including the coating of the optical fiber is 0.25 mm. The zero dispersion wavelength of the optical fiber with the number “1” is the shortest, and thereafter the zero dispersion wavelength becomes longer in order. Each optical fiber has the same nonlinear constant γ and transmission loss at each zero dispersion wavelength. As a result, each optical fiber has the same degree of nonlinear effect obtained at each zero dispersion wavelength. Such an optical fiber device accommodating a plurality of optical fibers at a high density is an optical fiber device that is small in size and can obtain the same degree of nonlinear effect at different zero dispersion wavelengths by simply replacing the connector. In addition, although the optical fibers of the numbers “1” to “8” have the same length, the zero dispersion wavelengths are different from each other, so that the light propagation times at the predetermined wavelengths are also different. Therefore, also in this optical fiber device, the timing adjustment of the optical pulse signal can be performed.

  Also in the example shown in FIG. 9, the inner diameters of the optical fiber bundles of numbers “1” to “8” to be stored are calculated using the equations (1) to (3) and (3a), and Each optical fiber is a highly nonlinear optical fiber having a different zero dispersion wavelength. For example, the zero dispersion wavelength becomes longer in order from the optical fiber of number “1”. Here, the filling factor parameter P was 90. Further, it is assumed that the nonlinear constant γ and the transmission loss at the zero dispersion wavelength of each optical fiber are the same. However, unlike the example shown in FIG. 8, the clad diameter of the optical fiber is 0.05 mm and the outer diameter is 0.085 mm. Therefore, even if the minimum inner diameter of the winding bundle is set to a smaller 15 mm, breakage and the like are prevented. As a result, each optical fiber can be stored more densely and compactly.

1 is a perspective view schematically showing the appearance of an optical fiber device according to Embodiment 1 of the present invention. It is the side view which represented typically the internal structure of the optical fiber apparatus seen from the housing | casing side part side. It is the top view which represented typically the internal structure of the optical fiber apparatus seen from the housing | casing upper surface part side. It is sectional drawing which represented typically the XX sectional view in FIG. It is the figure which showed the length of the optical fiber which comprises each winding bundle accommodated in the inside of the optical fiber apparatus shown in FIG. 1, the inner diameter of a winding bundle, and the diameter of a cross section. It is explanatory drawing explaining the setting of the length of an optical fiber, and the internal diameter of a winding bundle. It is the figure which showed another example of the length of the some optical fiber accommodated by the accommodation method based on this invention, the internal diameter of a bundle of bundles, and the diameter of a cross section. It is the figure which showed another example of the length of the some optical fiber accommodated by the accommodation method based on this invention, and the internal diameter of a wound bundle. It is the figure which showed another example of the length of the some optical fiber accommodated by the accommodation method based on this invention, and the internal diameter of a wound bundle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10-40 Multiple winding bundles 11a-18a, 11b-18b Winding bundle 100 Optical fiber apparatus 101 Case front part 102 Case upper surface part 103, 106 Case side face part 104 Case rear face part 105 Case bottom face part 107-110 Mounting plate A Connection adapter B Winding bundle C Optical connector G Groove H Holding jig H1, H2 Plate-shaped holding member

Claims (8)

An optical fiber storage method for storing a plurality of optical fibers,
The plurality of optical fibers are respectively bundled to form a plurality of bundles, a plurality of the plurality of bundles are arranged substantially concentrically, and a plurality of the plurality of concentrically arranged plurality of bundles are formed. Layered in layers and placed in a container,
The plurality of windings arranged concentrically,
First winding bundled with first winding bundle optical fibers disposed in the housing body, a second winding bundle obtained by bundling up the second optical fiber in inside diameter greater than the outer diameter of the first winding bundle Including those arranged so as to surround the outer periphery of the first winding bundle,
Setting the lengths of the first and second optical fibers and the inner diameters of the first and second bundles so that the cross-sectional diameters of the first and second bundles are substantially the same;
The inner diameter of the first bundle is D [mm], the cross-sectional diameter of the first bundle is D _B [mm], and the outer diameter including the first optical fiber coating is D _C [mm]. When the filling factor parameter of the cross section of the first optical fiber in the cross section of the first winding bundle is P, and the length of the first optical fiber is L [m],
Wherein D _B is to saw the following formulas (1) to (3), the inner diameter D ₂ of the second winding bundle [mm] The method of receiving an optical fiber, characterized in that to satisfy the following formula (4) .
D _B = 10 × (D _C ² × n × P ⁻¹ ) ^0.5 (1)
P> 60 (2)
n = 1000 × L / (πD) (3)
D ₂ − (D + D _B × 2)> 0 (4) When the total thickness of said first winding bundle and winding diameter direction of each winding bunch winding bundle holding member interposed between said second winding bundle and t [mm], D ₂ is of the formula The optical fiber storing method according to claim 1, wherein (4a) is satisfied.
D ₂ − (D + D _B × 2 + t)> 0 (4a)   The difference in diameter between the cross section of the first winding bundle and the cross section of the second winding bundle is within 10%, and the filling rate parameter P is 60 to 95. An optical fiber storage method according to claim 1.   An optical fiber device comprising a plurality of optical fibers housed by the method according to claim 1.   The optical fiber device according to claim 4, wherein an outer diameter of the plurality of optical fibers is 0.085 mm or less.   The optical fiber device according to claim 4, wherein the plurality of optical fibers have different propagation times of light at a predetermined wavelength.   The plurality of optical fibers have different zero dispersion wavelengths, the nonlinear constant γ and the transmission loss at the zero dispersion wavelength are the same, and the optical fiber device is a device that adjusts the timing of the plurality of optical pulse signals. The optical fiber device according to claim 6.   The optical fiber device according to claim 6 or 7, wherein the plurality of optical fibers have different lengths.

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