JP2002072028A - Optical transmitting and receiving system, its module and optical cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure causing no damage in the end face of an optical fiber or a partitioning member even if an optical plug rotates inside a module, in an optical transmitting and receiving system that realizes optical transmission with a full duplex communication system using a light-shielding partitioning member. SOLUTION: In the optical transmitting and receiving module, the partitioning member 80 for separating a light emitting device and a light receiving device is provided with a partitioning plate 81 having a concave surface 81a, an engaging part 82 for fixing the partitioning plate, a holding part 83 for movably holding the engaging part, and a leaf spring 84 for pressing the engaging part to an optical plug 90. The end face 91a of the optical fiber is a convex face protruding from the tip end of the plug. With the end face 90a of the optical plug coming into contact with the engaging face 86a of the engaging part, a gap G is formed between the end face 91a of the optical fiber and its opposing face 81a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-core bidirectional optical transmission / reception system for transmitting and receiving by sharing a single-core optical fiber.
Further, the present invention relates to an optical transmission / reception module and an optical cable used in the system. In particular, IEEE13
The present invention relates to a digital communication system capable of high-speed transmission, such as 94 or USB2.

[0002]

2. Description of the Related Art The applicant of the present application has filed Japanese Patent Application No.
-296273 (filed on Oct. 19, 1999), a shield plate is used to reduce electric crosstalk and shield a light-emitting device and a light-receiving device from each other, and a light-shielding partition contacting an end face of an optical fiber. We have proposed an optical transceiver system that reduces optical crosstalk and realizes full-duplex communication by using a board. The light emitting device is a device in which a light emitting element that emits a transmission signal light is sealed with a transparent resin, and the light receiving device is a device in which a light receiving element that receives a reception signal light is sealed with a transparent resin.

FIG. 9 shows that in this optical transmission / reception system, an optical plug 30 having a single-core optical fiber therein is inserted partway into an optical transmission / reception module (an overall view is omitted) and starts to contact the partition plate 19. FIG. 10 shows a state in which the optical plug 30 has been completely inserted into the optical transceiver module and has come into contact with the partition plate 19. 9 and 10,
(A) is a plan view of the partition plate 19, and (B) is a side view showing a positional relationship of the partition plate 19 with respect to the optical plug 30.

[0004] The optical plug 30 including the optical fiber varies in length during the manufacturing process. In this system, even when the optical plug 30 of any length is inserted into the optical transmitting / receiving module, the partition plug 19 always contacts the end face of the optical fiber 32 so that the optical plug 3 can be used even at the maximum variation (shortest).
0 (optical fiber end face), the partition plate 19 is disposed at a position pressed by the optical fiber end surface, and the partition plate 19 is provided with an elastic deformation function. It can be moved to the back (FIG. 10). In this way, variations in the length of the optical plug 30 are absorbed.

FIG. 11 shows a main part of an optical cable having an optical plug 30, which constitutes an optical transmitting and receiving system together with an optical transmitting and receiving module. In the figure, (A) is a side view and (B)
Is a rear view. As shown in FIG.
(Including the optical fiber) is provided at each end (only one end is shown) of the optical cable, and the end of the optical plug 30 including the end of the optical fiber is directed forward in the longitudinal direction of the optical fiber (that is, toward the module). It is an inclined surface 30a. In addition, the optical plug 30 is provided with a rotation preventing key 31 extending in the horizontal direction, and a key groove (not shown) cooperating with the key 31 is provided in the optical transmitting and receiving module, so that the optical plug 30 rotates with the rotation. The input and output characteristics of light are prevented from changing.

[0006]

In this system, a key 31 for preventing rotation is formed on the optical plug 30. If the key 31 is not aligned with the key groove of the optical transmitting / receiving module when the optical plug is mounted, the optical plug 30 is not provided. The plug cannot be inserted into the optical transmission / reception module, and there is a problem that user convenience is poor.

However, when the rotation preventing key 31 of the optical plug 30 is removed to improve the convenience at the time of mounting, the optical plug 30 becomes rotatable, so that the end face 30a of the optical fiber and the partition plate 19 are in contact with each other. With optical plug 3
0 may rotate. As a result, there is a problem that the end face of the optical fiber and the partition plate are damaged.

In view of the above, the present invention provides an optical transceiver module, an optical cable, and an optical transceiver system using the same, which enable light transmission by full-duplex communication using a light-shielding partition plate. It is an object of the present invention to provide a structure in which the optical fiber end face and the partition plate are not damaged even when they are rotated.

[0009]

In order to achieve the above object, the present invention comprises a light emitting element for emitting a transmission signal light and a light receiving element for receiving a reception signal light. In an optical transmitting and receiving module that shares a core optical fiber, a light-shielding partition member that separates an optical path of transmission signal light and an optical path of reception signal light from each other is provided, and the optical fiber is mounted at a predetermined position. An optical transmission / reception module having an opposing surface facing an end surface of an optical fiber when a gap is formed.

According to the above configuration, when the optical plug having the optical fiber therein is mounted in the optical transceiver module, there is a gap between the end face of the optical fiber and the opposing surface of the partition member. Even when is rotated, the end face of the optical fiber does not contact the opposing face. Therefore, these breaks can be prevented. Further, since the end face of the optical fiber and the partition member due to the rotation of the optical plug can be prevented in this way, it is not necessary to provide a rotation preventing mechanism in the optical transmitting / receiving module and the optical plug. It can be attached to the transmitting / receiving module.

From the viewpoint of optical transmission by the full-duplex communication system,
The gap (G) is preferably 0 mm <G <0.3 m
m, more preferably about 0.2 mm. Although it depends on the optical system, with this gap size, the bit error rate (BER) is set to 1E-12 (-1 of 10).
2), and optical transmission by the full-duplex communication method can be achieved.

[0012] The partition member may include positioning means for positioning the opposing surface with respect to the end surface of the optical fiber so that the gap is constant when the optical fiber is mounted at a predetermined position. . By providing such positioning means, it is possible to avoid a situation in which the gap between the opposing surface of the partition member and the end face of the optical fiber changes every time the optical plug is mounted. Therefore, stable full-duplex communication can be performed.

In one embodiment, the positioning means is an engaging surface that comes into contact with an end surface of a plug (ferrule) that holds the optical fiber therein, and the engaging surface is fixed to the facing surface. In a positional relationship.

[0014] In another embodiment, the positioning means is an engaging surface that contacts a portion of the end face of the optical fiber through which signal light does not pass, and the engaging surface is fixed to the opposing surface. In the specified positional relationship.

Preferably, a slidable material, that is, a material having a small coefficient of sliding friction, is used for the engagement surface. No matter how many times the optical plug is rotated, breakage of the contact point hardly occurs.

[0016] The partition member may include spring means for urging the engagement surface toward the optical fiber. In this case, the engaging surface is pressed with an appropriate force against a portion of the end surface of the plug or the end surface of the optical fiber through which the signal light does not pass, so that the gap can be prevented from changing during mounting of the optical plug.

In one embodiment, the partition member is located between the light emitting element and the light receiving element, the partition plate having the facing surface, the partition plate being fixed, and the engaging surface being fixed. And a holding portion having spring means for urging the engaging portion toward the optical fiber and holding the engaging portion movably in the optical axis direction of the optical fiber. .

According to this configuration, when the longer optical plug is inserted, the engaging portion is held by the holding portion, and is opposed to the spring force of the spring means from the initial position to the back of the module (plug insertion port). To the opposite side of Of course, the engagement surface will also move from its initial position to the back of the module accordingly. Accordingly, if the position corresponding to the shortest possible optical plug length is taken as the initial position of the engaging portion in consideration of the manufacturing variation of the optical plug, the variation (manufacturing tolerance) in the length of the optical plug is reduced. Even if there is, the variation can be absorbed by the movement of the engaging portion.

In one embodiment, the engaging portion has a substantially frusto-conical hole, and accommodates the distal end portion of an optical plug having an optical fiber in the hole.

If the facing surface has a shape substantially complementary to the end face shape of the optical fiber to be mounted, the gap can be reliably made constant over the entire end face of the optical fiber.

Further, the present invention provides an optical cable in which a single-core optical fiber is inserted, and each end face of the optical fiber is a curved surface which is rotationally symmetric with respect to the optical axis of the optical fiber. By using such an optical cable, it is possible to prevent the transmission signal light guided from one end face of the optical fiber from being reflected by the other end face, returning to the one end face and entering the light receiving element.

The rotationally symmetric curved surface is, for example, a convex (convex) surface. It may be a conical surface.

When any one of the above-mentioned optical transceiver modules and this optical cable are combined, even if the optical plug rotates in the module, neither the end face of the optical fiber nor the partition member is damaged, and the optical communication by the full-duplex communication method is performed. It is possible to realize an optical transmission / reception system which can perform communication stably and which is highly convenient for the user.

The end face of the optical fiber may protrude from plugs provided at both ends, and a radially outer portion of the end face of the optical fiber may cover a part of the end face of the plug. Such an end face structure of the optical fiber is particularly adopted in an embodiment in which the engaging surface of the partition member contacts a portion of the end face of the optical fiber through which the signal light does not pass.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical transmission / reception system according to an embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1, 2 and 3, the optical transceiver module 60 used in the optical transceiver system includes one
A receptacle section 61 for holding a position when a plug 90 having a core optical fiber is inserted from an insertion port 61a,
A pair of optical branching elements 62 that have been subjected to an anti-reflection film treatment as optical elements, a light emitting device 64 in which the light emitting element 63 is sealed,
Shield (not shown) formed of a conductive material covering light emitting device 64 and light receiving device 6 sealing light receiving element 65
6, a shield (not shown) formed of a conductive material covering the light receiving device 66, a partition member 80 that separates the optical path of the transmission signal light and the optical path of the reception signal light from each other and is movable in the longitudinal direction of the optical fiber, Drive IC for element 63
71, a substrate 72 made of PWB or the like for electric wiring of the drive IC 71, a shield 73 covering the drive IC 71 and the substrate 72, an amplifier IC 74 for amplifying a signal of the light receiving element 65, a substrate 7 made of PWB or the like for electric wiring of the amplifier IC 74
5, a shield 76 covering the amplification IC 74 and the substrate 75;
It comprises an external input / output terminal 77. In the illustrated example, a Foucault prism is used as the light branching element 62, but a microprism array may be used.

The partition member 80 includes a partition plate 81 located between the light emitting device 64 and the light receiving device 66 and between the pair of light branching elements 62, an engaging portion 82 to which one end of the partition plate 81 is fixed. , A holding portion 83 for holding the partition plate 81 movably in the optical axis direction of the optical fiber. As can be clearly understood from FIGS. 3B and 3D, the engaging portion 82 has a substantially frustoconical hole 85 at the center in order to smoothly receive the tip of the plug 90, and a bottom portion of the hole 85. It has an annular projection 86 protruding radially inward. The partition plate 81 is made of a phosphor bronze plate or a stainless steel plate having a thickness of about 50 μm, and is fixed to the bottom of the engaging portion 52 by insert molding. The partition plate 81 has a concave surface 81a on the side facing the hole 85.
The surface 81a is coated with a light absorbing material (a black paint containing carbon or the like). As can be clearly understood from FIG. 3C, a leaf spring 84 made of a phosphor bronze plate or a stainless steel plate is used.
Is attached to the holding portion 83 by insert molding or press fitting, and the spring 84 constantly urges the engaging portion 82 in the direction of the plug insertion hole 61a, that is, toward the optical fiber. Also, since the engaging portion 82 is slidably fitted into a rectangular hole provided in the holding portion 83, the spring 84
If a force larger than the force acts on the engaging portion 82, the engaging portion 82 and the partition plate 81 fixed thereto move in the direction opposite to the plug insertion hole 61a.

The optical transceiver module 60 forms an optical transceiver system together with the optical cable shown in FIG. The optical cable has optical plugs 90 at both ends (only one end is shown in FIG. 8), and an optical fiber 91 is inserted therein. As can be seen from the figure, this optical plug does not have a rotation preventing mechanism and is rotatable. The optical fiber end surface 91a protrudes from the plug (ferrule) end,
The radially outer portion covers a part of the plug end face 90a as shown in FIG. The optical fiber end surface 91a
The curved surface is rotationally symmetric with respect to the optical axis of the optical fiber, and is a convex surface in the example shown in FIG. Since the reflected light beam from the curved surface spreads, it is absorbed by the cladding as it propagates through the fiber, and as a result, the amount of reflected light coming out of the fiber is smaller than when the optical fiber tip is flat. The concave shape of the surface 81a of the partition plate 81 described above is complementary to the convex shape of the optical fiber end surface 91a.

When the optical plug 90 is inserted into the module 60 through the plug insertion hole 61a, as shown clearly in FIG.
Of the plug end face 90a, the portion of the plug end face 90a that is not covered by the fiber end face comes into contact with the surface (engagement face) 86a of the projection 86 of the engagement section 82 to partition the optical fiber tip. The relative position of the plates is determined. At this time, the optical fiber end face 91a and the partition plate 8 facing the end face 91a.
A gap G corresponding to the thickness of the projection 86 between the first facing surface 81a and the first facing surface 81a.
Can be. Since the optical fiber end surface 91a is a convex surface and the opposing surface 81a of the partition plate 81 has a concave shape complementary to the convex surface, the dimension of the gap G is the same even if it deviates from the center of the fiber. The size of the gap G depends on the structure of the optical system, but is preferably smaller than 0.3 mm (0 mm <G <
0.3 mm). The smaller is better. In this embodiment, the gap G is about 0.2 mm. The gap is 0.
If it is about 2mm, set the bit error rate (BER) to 1
Experiments have confirmed that the value can be set to 0 ^-12 and the full-duplex communication method can be sufficiently realized.

Since the engaging portion 82 of the partition member 80 is urged by the spring 84 in the direction of the plug insertion hole 61a, that is, in the direction of the optical plug 90, the engaging surface 86a is always pressed against the plug end surface 90a with a small force. Have been. Further, since the optical fiber end surface 91 a is a curved surface which is rotationally symmetric with respect to the optical axis of the optical fiber, the shape of the end surface 91 a does not change with respect to the facing surface 81 a of the partition plate 81 even when the optical plug 90 is rotated. For these reasons, the gap G is kept constant.

An optical plug 90 including an optical fiber is
Since the length varies in the manufacturing process, the partition member 80
Is fixed to the receptacle part 11 or the like,
Is fixed, the gap between the optical fiber end surface 91a and the opposing surface 81a of the partition plate 81 may be larger than the setting depending on the optical plug. For example, if the optical plug is a round plug conforming to the EIAJ-RC5720B standard, the length of the plug is 14.7 to 15 mm due to variations in the manufacturing process. If the gap is set to 0.2 mm and the position of the partition plate 81 is fixed in accordance with the longest optical plug, some plugs have a gap of 0.5 mm. But,
In the present embodiment, the position that can correspond to the shortest possible optical plug length is set as the initial position of the partition member 80 (specifically, the engaging portion 82), and the partition member 80 is set in the longitudinal direction of the optical fiber. The engaging portion 82 is always pressed against the optical plug end surface 90a by the leaf spring 84 with a very small force.
Is inserted, the gap spacing described above is kept constant.

The engaging surface 86a which comes into contact with the plug end surface 90a
Since the plug end face 90a slides on the plug by rotation of the plug, it is desirable to use a material having a low coefficient of sliding friction and excellent abrasion resistance, such as fluororesin or ultra high molecular weight polyethylene.

Next, the operation of the optical transmission / reception system having the above configuration will be described. When a transmission signal (electric signal) is input from the outside of the optical transceiver module 60 via the input / output terminal 77, the light emitting element 63 is driven by the driving IC 71,
Transmission signal light (optical signal) is emitted from the light emitting element 63.
This transmission signal light is converted into substantially parallel light by a lens 67 formed on the surface of the light emitting device 64, enters the light branching element 62, is deflected in the optical path, and enters the optical fiber 91.
The transmission signal light reflected by the end face of the optical fiber near the optical transmission / reception module (hereinafter, referred to as “near end facet”) 91a passes through the gap G between the partition plate 81 and the end of the optical fiber, and the light receiving device. It is incident on the 66 side. At this time, the gap G
Is as small as 0.2 mm, the incident light has a sufficiently small light amount.

The transmission signal light propagated through the optical fiber 91 is
Part of the light is reflected by an end surface (hereinafter, referred to as a “far end side end surface”) 91 a of the optical fiber that is farther from the optical transceiver module.
However, since the end surface 91a is a convex surface, the reflected light beam spreads and is absorbed by the cladding while propagating through the fiber.
As a result, there is little reflected light coming out from the fiber near-end side end surface 91a.

On the other hand, the transmission signal light exiting from the far end face 91a of the optical fiber enters the optical transceiver module of the communication partner.

The optical transmission / reception module of the communication partner also has the same configuration (the symbols are also described using the same symbols).
Then, the transmission signal light first arrives at the opposing surface 81a of the partition plate 81, but since this surface is coated with a light absorbing material (a black paint containing carbon or the like), the reflection here is caused. No light is generated.

Subsequently, the light reaches the light branching element 62. Here, since the surface of the light branching element 62 has been subjected to the antireflection film treatment, no reflected light is generated. Then, the transmission signal light incident on the optical branching element 62 is deflected in the optical path and formed on a lens 68 formed on the surface of the light receiving device 66.
And is incident on the light receiving element 65.

Although a part of the incident light is reflected by the light receiving element 65, the incident light is obliquely incident on the light receiving element 65, is reflected in the opposite oblique direction, and does not return to the light branching element 62. Thereafter, the light incident on the light receiving element 65 is photoelectrically converted into an electric signal, and is amplified by the amplifier IC 74.
The signal is extracted from the external input / output terminal 77 to the outside of the optical transceiver module as a reception signal.

In this optical transmission / reception system, the electrical crosstalk is suppressed by using the shield plate, and the optical member is provided with the partition member 80 having the partition plate facing the optical fiber end face with a slight gap therebetween. Since crosstalk is suppressed, optical transmission by the full-duplex communication method can be achieved. Further, since a gap is provided between the partition plate and the end face of the optical fiber, the end face of the optical fiber and the partition plate are not damaged by the rotation of the optical plug.

In the above-described optical transmission / reception system, the fiber end face 91a is a convex surface, the opposing surface 86a of the partition member 80 is a concave surface, and the gap G is the same even if it deviates from the center of the fiber. However, depending on the structure of the optical system, the gap may be large. In this case, as shown in FIG. 5, the opposing surface of the partition plate 81 has a surface 1 having no curved portion.
81a may be used.

The tip of the optical fiber is not limited to a convex surface.
A conical surface 191a as shown in FIG. In the example shown in FIG. 6, in order to make the same even if the gap G deviates from the center of the fiber, the opposing surface 281a of the partition plate 81 is conical.
It has a shape complementary to 1a. The shape of the optical fiber tip is
If the rotation is symmetrical with respect to the rotation of the plug, the amount of reflected light is smaller than that of a flat surface. Therefore, the gap may be set according to the shape.

In the above-described optical transmission / reception system, the engaging portion 82 of the partition member 80 is brought into contact with the plug end surface. However, as shown in FIG. The projection 86 may be longer than the projection 86 shown in FIG. The optical fiber contact position in this case is a position where the signal light does not pass. Specifically, in the case of an optical fiber having a cladding diameter of 1 mm, the position may be larger than 0.5 mm in the radial direction from the center of the optical fiber. In the example shown in FIG. 7, the thickness of the protrusion 186 of the engaging portion 82 is made smaller than the thickness of the protrusion 86 shown in FIG. ing.

[Brief description of the drawings]

FIG. 1A is a side view of an optical transceiver module in an optical transceiver system according to an embodiment of the present invention;
(B) is a sectional view taken along line 1B-1B of (A).

FIG. 2 is a sectional view similar to FIG. 1B when an optical plug is inserted into the optical transceiver module of FIG. 1;

3A is a front view of a partition member used in the optical transceiver module of FIG. 1, FIG. 3B is a cross-sectional view taken along the line BB of FIG. 3A, and FIG. FIG. 3D is a cross-sectional view taken along line C, and FIG. 4D is a cross-sectional view taken along line DD in FIG.

FIG. 4 is a cross-sectional view showing a contact state between an engaging portion of a partition member and an optical plug in the optical transceiver module of FIG. 1;

FIG. 5 is a sectional view similar to FIG. 4, showing a modification of the partition member.

FIG. 6 is a sectional view similar to FIG. 4, showing a modification of a partition member and an end face of an optical fiber.

FIG. 7 is a view similar to FIG. 4, showing a further modification of the partition member.

FIG. 8 is a perspective view showing one end side of an optical cable in the optical transmitting / receiving system of the present invention.

9A and 9B are a plan view and a side view of a partition plate used for an optical transceiver module proposed by the applicant of the present invention in a prior application, respectively, at the time when the optical plug starts to contact the partition plate. The state of is shown.

FIGS. 10A and 10B are a plan view and a side view of the partition plate at the time when the optical plug has completely contacted the partition plate.

FIGS. 11A and 11B are a side view and a rear view, respectively, of an optical cable used for an optical transmission / reception system proposed by the present applicant in a prior application.

[Explanation of symbols]

 Reference Signs List 60 light transmitting / receiving module 61 receptacle 61a insertion opening 62 light branching element 63 light emitting element 64 light emitting device 65 light receiving element 66 light receiving device 71 drive IC 72, 75 substrate 73, 76 shield 74 amplification IC 77 external input / output terminal 80 partitioning member 81 partition Plate 81a, 181a, 281a Opposing surface 82 Engagement part 83 Holding part 84 Leaf spring 85 Hole 86, 186 Projection 86a, 186a Engagement surface 90 Optical plug 91 Optical fiber 91a, 191a Optical fiber end surface

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 2H037 AA01 BA03 BA12 CA00 CA08 CA12 DA03 DA04 DA05 DA06 DA36 DA40 5F089 AA01 AB20 AC10 AC11 AC17 AC25 CA04 CA11 CA20 DA20 GA01

Claims (15)

[Claims] 1. An optical transmitting and receiving module comprising: a light emitting element that emits a transmission signal light; and a light receiving element that receives a reception signal light, wherein the signal light is transmitted and received by using a single optical fiber. A light-shielding partition member for separating an optical path of light and an optical path of received signal light from each other is provided.When the optical fiber is mounted at a predetermined position, the partition member faces the end face of the optical fiber with a gap. An optical transceiver module having an opposing surface. 2. The gap (G) is 0 mm <G <0.3 m
2. The optical transceiver module according to claim 1, wherein m is m. 3. The partitioning member includes positioning means for positioning the facing surface with respect to an end surface of the optical fiber so that the gap is constant when the optical fiber is mounted at a predetermined position. The optical transceiver module according to claim 1, wherein: 4. The positioning means is an engagement surface that contacts an end surface of a plug that holds an optical fiber therein, and the engagement surface has a fixed positional relationship with respect to the opposing surface. The optical transceiver module according to claim 3, wherein 5. The positioning means is an engaging surface that contacts a portion of the end face of the optical fiber through which signal light does not pass, and the engaging surface is in a fixed positional relationship with respect to the facing surface. The optical transceiver module according to claim 3, wherein: 6. The optical transceiver module according to claim 4, wherein said partition member further comprises a spring means for urging said engaging surface toward said optical fiber. 7. The partition member, which is located between the light emitting element and the light receiving element, has a partition surface having the facing surface, and has an engagement surface with which the partition plate is fixed and has the engagement surface. And a holding portion having spring means for urging the engaging portion toward the optical fiber and holding the engaging portion movably in the optical axis direction of the optical fiber. The optical transceiver module according to claim 4. 8. The optical transmitting and receiving module according to claim 7, wherein said engaging portion has a substantially frustoconical hole for accommodating a tip portion of an optical plug having an optical fiber. 9. The optical transceiver module according to claim 4, wherein a material having a small coefficient of sliding friction is used for the engagement surface. 10. A one-core optical fiber is inserted,
An optical cable, wherein each end face of the optical fiber is a curved surface rotationally symmetric with respect to the optical axis of the optical fiber. 11. An end face of the optical fiber protrudes from plugs provided at both ends, and a radially outer portion of the end face of the optical fiber covers a part of an end face of the plug. The optical cable according to claim 10. 12. The optical cable according to claim 10, wherein said rotationally symmetric curved surface is a convex surface or a conical surface. 13. An optical transceiver module according to claim 1, wherein a single-core optical fiber is inserted, and each end face of the optical fiber is rotationally symmetric with respect to the optical axis of the optical fiber. An optical transmission and reception system comprising: an optical cable having a curved surface. 14. An end face of the optical fiber protrudes from plugs provided at both ends, and a radially outer portion of the end face of the optical fiber covers a part of the end face of the plug. The optical transmission / reception system according to claim 13. 15. The optical transmission / reception module according to claim 13, wherein an opposing surface of said partition member has a shape substantially complementary to an end surface shape of an optical fiber.
The optical transmission / reception system according to claim 1.