JP2009175432A - Optical transmission and reception module and optical pulse tester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small optical transmission and reception module in which the optical path of an LD and an APD is separated. <P>SOLUTION: An LD 4 is installed in an upper part of a first mounting surface 3 of the body 2, a first ferrule 6 is installed on the opposite surface. An APD 10 is installed in a lower part of a second mounting surface 9 adjacent to the first mounting surface, a second ferrule 12 is installed on the opposite surface. An optical pulse from the LD is made incident on a fiber 8 to be measured, through the first ferrule and an optical coupler 7, while return light is made incident on the APD through the optical coupler and the second ferrule, an optical loss position or the like is detected from the output signal. The optical path of the LD and that of the APD are completely independent in the body, no directivity lowers. The LD and the APD are mountable on different surfaces of the body each with a margin by means of YAG laser welding. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical pulse tester for measuring an optical line by returning light reflected by the optical line when light is emitted to an optical line (fiber to be measured) constituted by an optical fiber. The present invention relates to an optical transmission / reception module that emits light from a light source and enters a light receiver, and particularly relates to an optical transmission / reception module that has a compact configuration and is smaller than the conventional one, and an optical pulse tester using the same. is there.

  An optical pulse tester (Optical Time Domain Reflectometer: OTDR) is a measuring instrument used for inspection of an optical network. For example, in order to shorten the extension distance of a cable and reduce the number of repeater stations, an optical splitter (OTDR) is used. In an optical line such as a PON (Passive Optical Network) in which a single optical cable is branched by an optical passive element such as an optical coupler), it can be effectively used for detecting an optical loss position and a fault point position.

  That is, the OTDR emits light to the optical line of the PON, and detects the return light that is reflected back from the light loss position or the obstacle point position in the optical line, thereby returning the light beam. It is possible to measure the light loss position and the obstacle point position in the road.

The following Patent Document 1 discloses an example of such an OTDR. As an optical transmission / reception module used in such an OTDR, for example, one having a structure as shown in FIGS. 11 to 13 is known. Yes.
Japanese Patent No. 3002343

  An optical transceiver module 100 shown in FIG. 11 includes two separate modules, an LD module 101 having a laser diode (hereinafter referred to as LD) as a light source and an APD module 102 having an avalanche photodiode (APD) as a light receiver. However, there is a problem that a large installation space for housing the optical coupler is required in the OTDR casing because it is connected to the optical line 104 as the fiber to be measured via the optical coupler 103.

  In the optical transceiver module 200 shown in FIG. 12, an LD and an APD are attached to different surfaces of a common main body 201 so that the optical axes cross each other, and an optical coupler 202 such as a half mirror is provided at the intersection of the optical axes. Thus, the LD light is emitted from the ferrule 203 provided on the other surface of the main body, and the return light incident on the ferrule 203 is emitted to the APD. According to such a configuration, the optical transmission / reception module 100 including the two modules 101 and 102 shown in FIG. 11 is smaller and requires less installation space. There is another problem that it is necessary to match the optical axes of the two optical elements, which makes adjustment difficult and expensive. In addition, the LD optical path and the APD optical path partially overlap each other, and the isolation between the two is poor, which causes a problem that the directivity from the LD to the APD decreases due to the influence of stray light. Further, since the optical coupler 202 provided in the main body 201 is expensive, there is a problem that the cost is increased in this respect.

  The optical transceiver module 300 shown in FIG. 13 is intended to solve the above-described directivity problem by attaching an LD and an APD to a common main body 301 so that the optical paths are separated from each other without using an optical coupler. . Specifically, LD and APD are mounted side by side on one surface of the main body 301, and two ferrules 302 and 303 corresponding to LD and APD are provided on the other surface opposite to one surface of the main body 301. These two ferrules 302, 303 is coupled to the fiber 305 to be measured via an optical coupler 304.

  However, in the optical transceiver module shown in FIG. 13, not all the problems have been solved, and the arrangement interval between the LD and the APD cannot be reduced due to a manufacturing problem described below. There was a problem that the overall size could not be reduced.

  That is, in general, a YAG laser is used as means for attaching an LD or APD to a main body in the manufacture of an optical transceiver module. The YAG laser is a system that encloses neodymium in YAG rods of yttrium (Y), aluminum (A), and garnet (G) and applies light such as a flash lamp to generate laser. Since the heat is diffused, heat does not diffuse, the penetration is in the vertical direction, and strong welding is possible, but since there is little distortion generated in the welded object and a high quality finish is obtained, adhesion and The optical axis shift due to change with time is much smaller than that of high-frequency soldering, and is used as means for attaching an LD or APD to the main body.

  Here, when the LD or APD is welded to the main body 301 by the optical transceiver module 300 shown in FIG. 13, the LD or APD is a cylindrical member, and the welding line with the main body 301 becomes a circumferential shape. Therefore, in order to perform high-precision welding with less distortion, usually three YAG emission heads 306 are arranged at equal intervals on the circumference as shown in FIG. 14, and YAG lasers are simultaneously welded from three directions. It is preferable to perform irradiation by irradiating 307. Therefore, there is no obstacle as much as possible around the LD or APD to be welded, and there is a need for a spatial margin that allows laser irradiation from three directions.

  However, as described above, since the LD and the APD are arranged on the same surface of the main body 301 in the optical transceiver module 300 shown in FIG. It is not possible to afford enough space for welding with such a YAG laser. Eventually, the arrangement interval between the LD and the APD was set large in order to perform welding with the YAG laser, and this caused a problem that the main body was enlarged and the size of the entire module could not be reduced.

  The present invention has been made to solve the above-described problems. Since the optical paths of the LD and APD are separated, there is no problem of directivity, and the work of aligning the optical axis is not complicated, and the cost is low. An object of the present invention is to provide a small optical transceiver module.

The optical transceiver module 1, 15, 20 according to claim 1 is:
Used in an optical pulse tester that measures the measured fiber by the return light that is reflected and returned when light is emitted to the measured fiber 8. The first ferrule 6 that receives the pulsed light and sends it to the fiber 8 to be measured, the second ferrule 12 that receives and emits the return light from the fiber 8 to be measured, and the second ferrule 12 exits. A light receiver 10 that receives a return light and outputs a signal, and a plurality of attachment surfaces 3 to which the light source 4 and the light receiver 10 are attached by YAG welding and the first and second ferrules 6 and 12 are attached. In the optical transceiver module 1, 15, 20 provided with the main body 2, 16, 21 having 9
A first optical path constituted by the light source 4 and the first ferrule 6 and a second optical path constituted by the light receiver 10 and the second ferrule 12 are inside the main bodies 2, 16, 21. It is characterized by being arranged independently of each other without crossing.

The optical transceiver module 1, 15, 20 according to claim 2 is the optical transceiver module according to claim 1,
The light source 4 and the light receiver 10 are attached to different attachment surfaces 3 and 9 that do not face each other, and the first ferrule 6 is attached to the attachment surface 5 to which the light source 4 is attached. The second ferrule 12 is attached to an attachment surface 11 facing the attachment surface 9 to which the light receiver 10 is attached.

The optical transceiver module 20 according to claim 3 is the optical transceiver module according to claim 2,
The light source 4 is a plurality of laser diodes 4a, 4b, and 4c that respectively transmit a plurality of types of pulsed light having different wavelengths, and the first ferrule 6 is formed by an optical coupling element 22 provided in the first optical path. It is characterized in that it is configured to selectively output pulsed light having a specific wavelength.

The optical transceiver module 20 according to claim 4 is the optical transceiver module according to claim 1,
The light source 4 includes a first laser diode 4a and a second laser diode 4b, which are respectively attached to attachment surfaces adjacent to each other, and the optical paths of the pulsed lights of the first and second laser diodes 4a and 4b are combined. An optical coupling element 22 that forms a first optical path by being waved is further provided, and the first ferrule 6 is attached to an attachment surface where the first optical path intersects, and the light receiver 10 includes the first optical path. The first and second laser diodes 4a and 4b are attached to a surface perpendicular to both of the attachment surfaces to which the first and second laser diodes 4a and 4b are attached, and the second ferrule 12 is attached to the attachment surface opposite to the surface to which the light receiver 10 is attached. It is characterized by being.

The optical transceiver module 20 according to claim 5 is the optical transceiver module according to claim 3 or 4,
An optical branching means 7 provided outside the main body 21 for emitting pulsed light from the first ferrule 6 to the measured fiber 8 and returning return light from the measured fiber 8 to the second ferrule 12. It is characterized by further having.

The optical pulse tester according to claim 6 comprises:
A light source 4 for transmitting pulsed light, a first ferrule 6 for receiving pulsed light from the light source 4 and sending it to the measured fiber 8, and a second light for receiving and emitting return light from the measured fiber 8. The ferrule 12, the light receiver 10 that receives the return light emitted from the second ferrule 12 and outputs a signal, the light source 4 and the light receiver 10 are attached by YAG welding, and the first and second light sources are attached. Optical transceiver modules 1, 15, 20 having main bodies 2, 16, 21 to which ferrules 6, 12 are attached;
Provided outside the main body 2, 16, 21, the pulsed light from the first ferrule 6 is emitted to the measured fiber 8 and the return light from the measured fiber 8 is emitted to the second ferrule 12. Optical branching means,
In the optical pulse tester for measuring the measured fiber 8 by the return light reflected and returned when the light is emitted to the measured fiber 8,
A first optical path constituted by the light source 4 and the first ferrule 6 and a second optical path constituted by the light receiver 10 and the second ferrule 12 are inside the main bodies 2, 16, 21. It is characterized by being arranged independently of each other without crossing.

  According to the optical transceiver module 1, 15, or 20 according to claim 1, the first optical path from the light source 4 to the first ferrule 6 and the second optical path from the second ferrule 12 to the light receiver 10. Are arranged independently of each other without crossing in the main bodies 2, 16, and 21, so that the problem of directivity does not occur. In addition, since the light source 4 and the light receiver 10 can be attached to different surfaces of the main bodies 2, 16, and 21, the main bodies 2, 16, and 21 can be reduced in size, Since there is enough space to perform YAG welding, there is no problem in welding work during manufacturing.

  According to the optical transceiver module 1, 15, 20 according to claim 2, the effect of the optical transceiver module according to claim 1 is attached to different mounting surfaces 3, 9 that do not oppose the light source 4 and the light receiver 10, respectively. The first ferrule 6 can be realized by a structure attached to the side opposite to the light source 4, and the second ferrule 12 can be realized on the side opposite to the light receiver 10.

  According to the optical transceiver module 20 recited in claim 3, in addition to the effects of the optical transceiver module according to claim 2, the plurality of laser diodes 4 a, 4 b, which respectively transmit a plurality of types of pulsed light having different wavelengths. By 4c, it is possible to selectively output pulse light of a specific wavelength from the first ferrule 6 and test the measured fiber 8 using an optical pulse tester.

  According to the optical transceiver module 20 recited in claim 4, in the effect of the optical transceiver module according to claim 1, when the light source 4 includes laser diodes 4 a and 4 b that respectively transmit two different types of pulsed light. Each of the laser diodes is configured to output the pulsed light from the common ferrule by combining the outgoing optical paths of the laser diodes with the optical coupling element 22, so that each laser diode has a separate outgoing optical path. 21 can be reduced in size.

  According to the optical transceiver module 20 described in claim 5, in the effect of the optical transceiver module according to claim 3 or 4, the pulse light from the first ferrule 6 is obtained by the optical branching means 7 arranged outside the main body 21. Can be emitted to the measured fiber 8, and the return light from the measured fiber 8 can be emitted to the second ferrule 12.

  According to the optical pulse tester described in claim 6, the optical transmission / reception module 1 that measures the measured fiber 8 by the return light reflected and returned when the light is emitted to the measured fiber 8, 15 and 20, the first optical path from the light source 4 to the first ferrule 6 and the second optical path from the second ferrule 12 to the light receiver 10 do not cross each other in the main bodies 2, 16, and 21. Because they are arranged independently, there is no directivity problem. In addition, since the light source 4 and the light receiver 10 can be attached to different surfaces of the main bodies 2, 16, and 21, the main bodies 2, 16, and 21 can be reduced in size, Since there is enough space to perform YAG welding, there is no problem in welding work during manufacturing.

First to third embodiments of the present invention will be described with reference to FIGS.
1. First embodiment (FIG. 1)
FIG. 1 is a schematic perspective view of an optical transceiver module 1 of the first embodiment.
As shown in FIG. 1, the optical transmission / reception module 1 has a box-shaped main body 2 having a cubic or rectangular parallelepiped shape. An LD 4 as a light source is attached to the first attachment surface 3 of the main body 2. A first ferrule 6 is attached to the opposite attachment surface 5 parallel to the first attachment surface 3 and facing the first attachment surface, at a position corresponding to the LD 4. Is made to enter the measured fiber 8 through an optical coupler 7 as an optical branching means.

  Further, an APD 10 as a light receiver is attached to a second attachment surface 9 adjacent to the first attachment surface 3 without facing the first attachment surface 3 at a position slightly below the center. It has been. A second ferrule 12 is attached to a position corresponding to the APD 10 on the opposite attachment surface 11 parallel to the second attachment surface 9 and facing the second attachment surface 9. Return light that enters through the optical coupler 7 is guided to the APD 10.

  The operation in this example will be described. First, the measured fiber 8 is connected to an optical pulse tester incorporating the optical transceiver module 1 of this example. A light pulse having a predetermined wavelength is emitted from the LD 4 controlled by the light pulse tester, and this light pulse is incident on the measured fiber 8 via the first ferrule 6 and the optical coupler 7. This light pulse is reflected at the light loss position or the obstacle point position in the fiber 8 to be measured, and enters the APD 10 through the optical coupler 7 and the second ferrule 12 as return light. The APD 10 outputs a signal corresponding to the incident return light, and the optical pulse tester analyzes this signal to detect the optical loss position and the fault point position, and displays the result on the display unit.

  According to this example, the first optical path constituted by the LD 4 and the first ferrule 6 and the second optical path constituted by the APD 10 and the second ferrule 12 are arranged substantially perpendicularly apart from each other in the vertical direction. Thus, they are independent from each other without crossing within the main body 2. Therefore, there is no fear that the directivity from the LD 4 to the APD 10 is reduced by stray light, and the accuracy when measuring the measured fiber by connecting to the optical pulse tester is not reduced.

  According to this example, since the LD 4 and the APD 10 are respectively attached to the different adjacent attachment surfaces 3 and 9 of the main body 2, when the LD 4 and the APD 10 are fixed to the main body 2 by YAG laser welding, each of the LD 4 and the APD 10 is provided. There are no obstacles that interfere with the welding operation performed by irradiating the YAG laser. Therefore, the size of the main body 2 can be limited to the minimum size as long as the independence of the first and second optical paths can be maintained as described above, and the light having excellent directivity as described above. The transceiver module 1 can be realized in a compact configuration.

2. Second Embodiment (FIGS. 2 to 5)
The optical transceiver module 15 of the second embodiment is a more specific configuration of the optical transceiver module 1 of the first embodiment having one LD 4 and one APD 10, and FIG. 3 is a right side view of the second embodiment, FIG. 4 is a cross-sectional view taken along the line A in FIG. 3, and FIG. 5 is a cross-sectional view taken along the line B in FIG.

  As shown in FIGS. 2 to 5, the optical transceiver module 15 of this example has a solid rectangular solid block as a main body 16, and each surface of the block serves as a mounting surface for mounting components as will be described later. Yes. Between the right side surface 16a and the left side surface 16b of the main body 16, a first optical path hole 17 penetrating left and right is formed. The LD 4 as a light source is attached to the opening of the first optical path hole 17 on the right side surface 16a, and the first ferrule 6 is attached to the opening of the first optical path hole 17 on the left side surface 16b. . That is, the LD 4 attached to the right side surface 16a and the first ferrule 6 attached to the left side surface 16b pass through the first optical path through which the laser light from the LD 4 passes through the sealed first optical path hole 17. The pulsed light from the LD 4 passes through the first optical path hole 17, is guided from the first ferrule 6 to the outside of the main body 16, and is incident on a measured fiber (not shown) through an optical coupler (not shown). It is comprised so that.

  In addition, a second optical path hole 18 penetrating vertically is formed between the bottom surface 16c of the main body 16 and the top surface 16d. The second optical path hole 18 does not intersect the first optical path hole 17 in the main body 16 and thus does not communicate with the first optical path hole 17. That is, both optical path holes 17 and 18 are independent of each other. An APD 10 as a light receiver is attached to the opening of the second optical path hole 18 on the bottom surface 16c, and the second ferrule 12 is attached to the opening of the second optical path hole 18 on the top surface 16d. That is, the APD 10 attached to the bottom surface 16c and the second ferrule 12 attached to the top surface 16d receive the laser light that is the return light from the measured fiber through the sealed second optical path hole 18. The return light that has entered the second ferrule 12 through the optical coupler (not shown) from the fiber to be measured (not shown) passes through the second optical path hole 18 and enters the APD 10. It is configured.

  According to this example, the first optical path constituted by the LD 4 and the first ferrule 6 and the second optical path constituted by the APD 10 and the second ferrule 12 do not cross and communicate within the main body 16. Since they are arranged in the first optical path hole 17 and the second optical path hole 18 formed independently of each other, they are completely independent of each other. Therefore, there is no fear that the directivity from the LD 4 to the APD 10 is reduced by stray light, and the accuracy when measuring the measured fiber by connecting to the optical pulse tester is not reduced.

  In addition, according to this example, the first optical path and the second optical path are arranged substantially orthogonally apart from each other in the vertical direction, so that the LD 4 and the APD 10 are mounted on different mounting surfaces (right side surface and bottom surface) adjacent to the main body 16. In the case where the LD4 and the APD 10 are welded and fixed to the main body 16 by YAG laser welding, respectively, the surroundings of the LD4 and the APD 10 are disturbed by the YAG laser irradiation. There are no obstacles. Therefore, the size of the main body 16 can be limited to the minimum size as long as the independence of the first and second optical paths can be maintained as described above, and the light having excellent directivity as described above. The transmission / reception module 15 can be realized in a compact configuration.

3. Third Embodiment (FIGS. 6 to 10)
The third embodiment is an optical transceiver module 20 having two LDs 4 and one APD 10. FIG. 6 is a perspective view of the third embodiment, FIG. 7 is a plan view of the third embodiment, and FIG. FIG. 9 is a front view of the third embodiment, FIG. 9 is a right side view of the third embodiment, and FIG. 10 is a cross-sectional view taken along line C in FIG.

  As shown in FIGS. 6 to 10, the optical transceiver module 20 of this example uses a rectangular parallelepiped block as a main body 21, and each surface of the block serves as a mounting surface for mounting components as will be described later. A first optical path hole 23 penetrating left and right is formed between the right side surface 21a and the left side surface 21b of the main body 21 as shown in FIG. The first LD 4a as a light source is attached to the opening of the first optical path hole 23 on the right side surface 21a, and the first ferrule 6 is attached to the opening of the first optical path hole 23 on the left side surface 21b. It has been. In other words, the first LD 4a attached to the right side surface 21a and the first ferrule 6 attached to the left side surface 21b allow the laser light from the first LD 4a to pass through the sealed first optical path hole 23. The pulsed light from the first LD 4a passes through the first optical path hole 23, is guided out of the main body 21 from the first ferrule 6, and passes through an optical coupler (not shown). It is configured to be incident on a fiber to be measured (not shown).

  A hole 24 communicating with the first optical path hole 23 is opened on the front surface 21c of the main body 21, and the second LD 4b is attached to the opening. As shown in FIG. 10, a beam splitter 22 is disposed at the crossing position where the first optical path hole 23 and the hole 24 communicate with each other, and reflects the light from the second LD 4b to reflect the first light path hole 23 and the first light path hole 23. The light can be sent from the optical path hole 23 to the first ferrule 6. That is, a first optical path is also formed between the second LD 4b attached to the front surface 21c and the first ferrule 6 attached to the left side surface, and the first optical path is hermetically sealed first. The optical path hole 23 and the hole 24 are disposed inside. That is, the pulsed light from the second LD 4b enters the first optical path hole 23 from the hole, is reflected by the beam splitter 22, passes through the first optical path hole 23, enters the first ferrule 6, and from here It is configured to be guided out of the main body 21 and to be incident on a measured fiber (not shown) via an optical coupler (not shown). The light emitted from the first LD 4 a to the first optical path hole 23 passes through the beam splitter 22 and enters the first ferrule 6.

  The first LD 4a and the second LD 4b are different in the wavelength of the laser beam to be output, and have a wavelength required for detecting the optical loss position and the fault point position of the fiber to be measured by connecting to the optical pulse tester. You can select and use.

  Next, a second optical path hole 26 penetrating vertically is formed between the bottom surface 21e of the main body 21 and the top surface 21f as shown in FIG. The second optical path hole 26 does not intersect the first optical path hole 23 in the main body 21 and therefore does not communicate with the first optical path hole 23. That is, both optical path holes are independent of each other. An APD 10 as a light receiver is attached to the opening of the second optical path hole 26 on the bottom surface 21e, and the second ferrule 12 is attached to the opening of the second optical path hole 26 on the top surface. In other words, the APD 10 attached to the bottom surface 21e and the second ferrule 12 attached to the top surface are the second in which the laser light that is the return light from the measured fiber passes through the sealed second optical path hole 26. The return light that has entered the second ferrule 12 through the optical fiber (not shown) from the fiber to be measured (not shown) passes through the second optical path hole 26 and enters the APD 10. Has been.

  The first and second LDs 4a and 4b and the APD 10 of the optical transceiver module 20 of this example are connected to an optical pulse tester, and the first and second ferrules 6 and 12 are measured via an optical coupler as an optical branching unit. When connected to the fiber, the optical loss position and the fault point position of the measured fiber can be detected by the same operation as in the first to second embodiments, and the result can be displayed on the display unit. However, since the present example has two LDs 4a and 4b, it is possible to select and use a wavelength necessary for detecting the optical loss position and the fault point position of the measured fiber.

  According to this example, the first optical path constituted by the first and second LDs 4a, 4b and the first ferrule 6 and the second optical path constituted by the APD 10 and the second ferrule 12 are the main body 21. Since they are arranged in the first optical path hole 23 and the second optical path hole 26 formed independently of each other without crossing or communicating with each other, they are completely independent from each other. Therefore, there is no fear that the directivity from the LD 4a, b to the APD 10 is reduced by stray light, and the accuracy when measuring the measured fiber by connecting to the optical pulse tester is not reduced.

  Further, according to the present example, the first optical path and the second optical path are arranged so as to be substantially orthogonal to each other in the vertical direction, and the optical paths of the two LDs 4a and b are coupled by the beam splitter. Since the two LDs 4a, b and the APD 10 can be attached to different adjacent attachment surfaces (the right side surface 21a, the front surface 21c, and the bottom surface 21e) of the main body 21, the two LDs 4a, b can be formed by YAG laser welding. When the APD 10 is fixed to the main body 21 by welding, there are no obstacles around the two LDs 4a, b and APD 10 that obstruct the welding operation performed by irradiating the YAG laser. Therefore, the size of the main body 21 can be limited to the minimum size as long as the independence of the first and second optical paths can be maintained as described above, and the light having excellent directivity as described above. The transmission / reception module 20 can be realized in a compact configuration.

4). Other Embodiments In the third embodiment, a third LD 4c is provided at a position near the left side surface 21b of the back surface that does not face the second LD 4b on the front surface 21c of the main body 21, and the light from the third LD 4c is the It can also be configured to be coupled to the first optical path by two beam splitters. The wavelength of the third LD 4c is different from the wavelengths of the first to second LDs 4a and b, and the degree of freedom in wavelength selection is further increased according to the necessity of measurement.

  According to this example, since the optical path on the LD4 side and the optical path on the APD10 side are completely independent from each other, the directivity of the APD10 is not reduced by stray light, and is connected to the optical pulse tester. The accuracy when measuring the fiber is not reduced. In addition, according to this example, the three LDs 4a, b, c are attached to the right side 21a, the front side 21c, and the left side 21b, and the APD 10 is attached to the bottom side 21e. In the case where c and APD 10 are fixed to the main body 21 by welding, there are no obstacles that interfere with the welding work around each LD 4a, b, c, and APD 10, and substantially the same effects as in the above embodiments are obtained. can get.

FIG. 1 is a schematic perspective view of the optical transceiver module of the first embodiment. FIG. 2 is a front view of the second embodiment. FIG. 3 is a right side view of the second embodiment. 4 is a cross-sectional view taken along line A in FIG. FIG. 5 is a cross-sectional view taken along line B of FIG. FIG. 6 is a perspective view of the third embodiment. FIG. 7 is a plan view of the third embodiment. FIG. 8 is a front view of the third embodiment. FIG. 9 is a right side view of the third embodiment. 10 is a cross-sectional view taken along the line C in FIG. FIG. 11 is a cross-sectional view of the first conventional optical transceiver module. FIG. 12 is a sectional view of a second conventional optical transceiver module. FIG. 13 is a perspective view of a third conventional optical transceiver module. FIG. 14 is a perspective view showing a welding process in the manufacture of the optical transceiver module of the third conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,15,20 ... Optical transmission / reception module 2,16,21 ... Main body 3 ... First attachment surface 4 ... LD as light source
5, 11 ... Mounting surface 6 ... First ferrule 7 ... Optical coupler 8 ... Fiber to be measured 9 ... Second mounting surface 10 ... APD as light receiver
12 ... 2nd ferrule 17, 23 ... 1st optical path hole 18, 26 ... 2nd optical path hole

Claims (6)

A light source (4) that is used in an optical pulse tester that measures the measured fiber by return light that is reflected and returned when light is emitted to the measured fiber (8); A first ferrule (6) that receives pulsed light from the light source and sends it to the fiber to be measured; a second ferrule (12) that receives and emits return light from the fiber to be measured; A light receiver (10) that receives the return light emitted from the ferrule and outputs a signal, and a plurality of attachment surfaces to which the light source and the light receiver are attached by YAG welding and the first and second ferrules are attached. In an optical transceiver module comprising a main body (2, 16, 21) having (3, 9),
A first optical path constituted by the light source and the first ferrule and a second optical path constituted by the light receiver and the second ferrule are independent from each other without crossing within the main body. An optical transceiver module (1, 15, 20) characterized by being arranged. The light source (4) and the light receiver (10) are mounted on different mounting surfaces that do not face each other, and the first ferrule (6) is mounted on the mounting surface facing the mounting surface on which the light source is mounted. The optical transceiver module (1, 15,) according to claim 1, wherein the second ferrule (12) is attached to an attachment surface opposite to the attachment surface to which the light receiver is attached. 20). The light source (4) is a plurality of laser diodes that respectively transmit a plurality of types of pulsed light having different wavelengths, and the first ferrule (6) is provided by an optical coupling element (22) provided in the first optical path. The optical transmission / reception module (20) according to claim 2, wherein the optical transmission / reception module (20) is configured to selectively output pulsed light having a specific wavelength. The light source (4) is a first laser diode (4a) and a second laser diode (4b), which are respectively attached to attachment surfaces adjacent to each other, and the pulse light of the first and second laser diodes. An optical coupling element (22) that combines the optical paths to form the first optical path is further provided, and the first ferrule (6) is attached to an attachment surface where the first optical paths intersect, The light receiver (10) is attached to a surface orthogonal to any of the attachment surfaces to which the first and second laser diodes are attached, and the second ferrule (12) is a surface to which the light receiver is attached. The optical transceiver module (20) according to claim 1, wherein the optical transceiver module (20) is attached to an attachment surface opposite to the antenna. Provided outside the main body (21), emits pulsed light from the first ferrule (6) to the measured fiber (8) and returns light from the measured fiber to the second ferrule (12). The optical transmission / reception module (20) according to claim 3 or 4, further comprising an optical branching means (7) for emitting light to the light source. A light source (4) for transmitting pulsed light, a first ferrule (6) that receives pulsed light from the light source and sends it to the fiber to be measured (8), and receives and emits return light from the fiber to be measured. A second ferrule (12), a light receiver (10) that receives the return light emitted from the second ferrule and outputs a signal, and the light source and the light receiver are attached by YAG welding and the first ferrule (12). An optical transceiver module (1, 15, 20) comprising a body (2, 16, 21) to which the first and second ferrules are attached;
An optical branching unit that is provided outside the main body, emits pulsed light from the first ferrule to the fiber to be measured and emits return light from the fiber to be measured to the second ferrule;
In the optical pulse tester that measures the measured fiber by the return light that is reflected and returned when the light is emitted to the measured fiber,
A first optical path constituted by the light source and the first ferrule and a second optical path constituted by the light receiver and the second ferrule are independent from each other without crossing within the main body. An optical pulse tester characterized by being arranged.

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