JPH10115732A - Optical transmission and reception module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the optical transmission and reception module which can optically couple a laser element, a light receiving element, and an optical fiber by using a small number of components and is assembled by making adjustment at a low frequency and also easy mounted with a light emitting element and the light receiving element. SOLUTION: The optical transmission and reception module which transmits and receives light through the optical fiber 44 in two ways is provided with a substrate 31 which has a 45 deg. slanting surface 34, the light emitting element 32 which is arranged adjacently to the slanting surface of the substrate 31, the light receiving element 33 which is arranged on the substrate 31 on the same side with the light emitting element 32, and a half-mirror 38, a reflecting mirror 39, and a condenser lens 42 as an optical system which makes light emitted by the light emitting element 32 and reflected by the slanting surface on the optical fiber 44 and makes the light projected from the optical fiber 44 incident on the light receiving element 33 for reception. The light emitting element 32 and light receiving element 33 are mounted on the same surface of the substrate 31 to reduce the overall thickness of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way transmission of light from a light emitting element to one optical fiber for guiding the light emitted from the light emitting element to an optical fiber and condensing the light output from the optical fiber to the light receiving element. In particular, the present invention proposes a novel configuration that facilitates adjustment and the like during assembly.

[0002]

2. Description of the Related Art When bidirectional transmission is performed using a single optical fiber, an optical transceiver module for guiding light of a transmission signal to the optical fiber and receiving light of a received signal from the optical fiber is used as an optical fiber. Optically coupled to

For example, in a conventional optical transmitting / receiving module disclosed in Japanese Patent Application Laid-Open No. 3-129306, a polarizing element 12 is disposed in a case 11 as shown in FIG.
The ferrule 13 to which the optical fiber 14 is fixed, the package 16A to which the lens 17A and the light emitting laser element 18A are fixed, and the package 16B to which the lens 17B and the light receiving element 18B are fixed are connected. 21A and 21B are polarizing plates,
Reference numerals 20A and 20B denote stems of semiconductor elements (laser element 18A and light receiving element 18B).

In this optical transmitting / receiving module, a laser element
The light output from 18A is condensed by a lens 17A, and the polarization direction is adjusted by a polarizing plate 21A.
The light passes through 12a and enters the optical fiber 14.

On the other hand, the light output from the optical fiber 14 is
The polarized light is reflected by the polarizing surface 12a of the polarizing element 12 and is polarized by the polarizing plate 21B.
After being returned, the light is condensed by the lens 17B and enters the light receiving element 18B.

The assembly of this module is performed as follows. Ferrule with optical fiber 14 fixed in the center
13 is fixed to the case 11 in advance. The stem 20A on which the laser element 18A is mounted is adjusted and attached to the package 16A to which the lens 17A is fixed, and then the package 16A is moved while adjusting the position so that the output light of the laser element 18A enters the optical fiber 14. Fixed to.

[0007] Similarly, a package in which the lens 17B is fixed.
The stem 20B on which the light receiving element 18B is mounted is adjusted and attached to 16B, and the light output from the optical fiber 14 is received by the light receiving element 18B.
Package 16 while adjusting the position so that
B is fixed to the case 11.

[0008]

However, in the conventional optical transmitting / receiving module, the laser element 18A and the light receiving element 18B are mounted on separate packages, respectively, and these semiconductor elements and the optical fiber 14 are separated by separate lenses. Since the optical coupling is performed using 17A and 17B, the number of parts increases, and it takes time to manufacture and assemble.

The light emitting element 18A is connected to the optical fiber 14.
To adjust the position of the light receiving element 18B and fix it, the optical adjustment is required twice.

Further, since the electrode terminals of the light emitting element 18A and the light receiving element 18B are provided on the wall surface of the case 11, it is necessary to bend these electrodes when mounting the module on the substrate. There was a problem.

The present invention solves such a conventional problem. The laser element and the light receiving element can be optically coupled to the optical fiber with a small number of components, and can be assembled with a small number of adjustments. It is another object of the present invention to provide an optical transceiver module in which a light emitting element and a light receiving element can be easily mounted.

[0012]

Therefore, in the optical transceiver module of the present invention, a 45-degree slope is formed on a substrate to form a micromirror, and a light-emitting element is arranged adjacent to the slope of the substrate to emit light. An optical system for arranging a receiving light receiving element on the same substrate surface as the element, guiding light emitted from the light emitting element to an optical fiber, and guiding light emitted from the optical fiber to the receiving light receiving element is provided. .

[0013] In this module, the light emitted from the light emitting element changes its traveling direction by the micromirror provided on the substrate, so that the light emitting element can be mounted on the substrate in a plane. Further, the light receiving element for reception can also be mounted on a substrate in a plane because of its structure, and as a result, a thin optical device can be realized.

In addition, since the light emitting element and the light receiving element are fixed on the same surface of the substrate, the optical coupling between one of the light emitting element or the light receiving element and the optical fiber is adjusted at the time of assembly, so that the other optical coupling is simultaneously performed. It can be configured to be achieved and the adjustment work is facilitated.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to an optical transmitting and receiving module for transmitting and receiving light transmitted bidirectionally through an optical fiber, comprising: a substrate having a 45-degree slope formed thereon; A light emitting element arranged adjacent to the slope,
A light-receiving element for reception arranged on the same substrate surface as the light-emitting element, and light emitted from the light-emitting element and reflected on the slope is incident on the optical fiber, and light emitted from the optical fiber is transmitted to the light-receiving element for reception. An incident optical system is provided, and the light emitting element and the receiving light receiving element are mounted on the same surface of the substrate in a plane, so that the overall device can be made thinner.

According to a second aspect of the present invention, the optical system of the optical transceiver module includes a half mirror provided to be inclined above one of the light emitting element and the receiving light receiving element, and a half mirror provided between the light emitting element and the receiving light receiving element. It consists of a reflection mirror provided in parallel with the half mirror above the other, and a condenser lens arranged in the optical path between the half mirror and the optical fiber, and the condenser lens, the half mirror and the reflection mirror are linearly arranged in this order. Since they are arranged so as to be lined up and light is split and reflected using a half mirror, the number of components can be reduced.

According to a third aspect of the present invention, a monitor light receiving element for monitoring reflected light of light emitted from the light emitting element is disposed on the same substrate surface as the light emitting element. The light emission amount of the light emitting element can be controlled based on the light reception amount of the element.

According to the fourth aspect of the present invention, the light receiving diameter of the monitor light receiving element is made larger than the light receiving diameter of the receiving light receiving element, and the detection accuracy can be improved.

According to a fifth aspect of the present invention, a plate is provided above the light emitting element so as to increase the amount of reflected light incident on the monitoring light receiving element and to reduce the amount of reflected light incident on the receiving light receiving element. This arrangement increases the detection accuracy of the monitoring light receiving element and reduces noise applied to the receiving light receiving element.

According to a sixth aspect of the present invention, a concave portion having a 45-degree slope is formed in the substrate, the light emitting element is disposed on the bottom surface of the concave portion, and the light receiving element for reception is provided with a height adjusting member on the substrate. It is set so that the distance from the bottom surface of the concave portion to the height of the upper surface of the light receiving element for reception is almost equal to the distance from the half mirror to the reflection mirror divided by the refractive index of the substance in between. In this case, the optical path length from the light emitting element to the optical fiber is equal to the optical path length from the optical fiber to the light receiving element for reception, so that good optical coupling between the module and the optical fiber can be obtained.

According to a seventh aspect of the present invention, the optical system of the optical transmission / reception module includes a first condensing lens disposed above one of the light emitting element and the receiving light receiving element, and a light emitting element or the receiving light receiving element. A second condensing lens disposed above the other of the elements, a reflecting mirror provided inclined above the first condensing lens, and an end face contacting the reflecting mirror; An optical fiber extending parallel to the substrate above the condensing lens, a cutting groove provided in the optical fiber at an angle near the upper part of the second condensing lens, and a half mirror disposed in the cutting groove. , And adjustment of optical coupling at the time of assembly can be easily performed.

According to an eighth aspect of the present invention, the optical system of the optical transmission / reception module includes one spherical lens disposed above the light emitting element, a reflecting mirror provided inclined above the spherical lens, An optical fiber that is in contact with the reflection mirror and extends in parallel with the substrate above the spherical lens, a cutting groove provided on the optical fiber at an angle, a half mirror disposed in the cutting groove, and light reflected by the half mirror. The second reflected light enters the light receiving element for reception through the spherical lens.
And the number of condensing lenses can be reduced to one, and the number of components can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) As shown in FIG. 1, an optical transceiver module according to the first embodiment has a 45 mm
A silicon substrate 31 having a concave portion having an inclined surface (micro mirror) 34 formed thereon, and a semiconductor laser (LD) 32 disposed on the bottom surface of the concave portion and emitting light toward the micro mirror 34
A PIN photodiode (PD) 33 disposed on the upper surface of the silicon substrate 31; a package 35 in which the silicon substrate 31 is fixed; a transparent protective glass 36 for closing the upper surface of the package 35; A quadrilateral prism 37 fixed on a protective glass 36 via a transparent position fixing member, comprising a mirror 39, and a quadrilateral prism 37
A lens 42 for condensing the light reflected by the light source and the light incident on the quadrilateral prism 37;
And a case cover 40 covering the lens 42 and the case cover 40
A transparent bonding plate 41 that blocks the opening surface of the
A precision capillary 43 into which the precision capillary 43 is inserted and fixed, an adjustment ring 45 for fixing the precision capillary 43, and a transparent fixing plate 46 for closing an end face of the adjustment ring 45 are provided.

The quadrangular prism 37 is constructed by inserting a glass plate between a parallel half mirror 38 and a reflecting mirror 39. The half mirror 38 has a function of splitting incident light and a function of reflecting it. Behind the reflection mirror 39,
A glass plate 47 for protecting the reflection mirror 39 is arranged, and on the half mirror 38 side, a triangular prism-shaped glass body having a surface perpendicular to the protection glass 36 on the opposite side of the half mirror 38 is joined. I have.

The end surface of the lens 42 is fixed to a surface of the glass body perpendicular to the protective glass 36 so that the center of the lens 42 and the optical path coincide with each other.

The case cover 40 is bonded and fixed to the package 35 and the protective glass 36, and the opening of the case cover 40 is closed by a bonding plate 41 made of transparent glass.

On the other hand, the optical fiber 44 is inserted and fixed in the precision capillary 43, and both end surfaces of the optical fiber 44 and the precision capillary 43 are optically polished.

A fixing plate 46 made of a transparent glass plate is fixed to one end of the adjustment ring 45. The inner diameter of the adjustment ring 45 is formed slightly larger than the outer diameter of the precision capillary 43, and the precision capillary 43 is inserted and fixed in the hole of the adjustment ring 45, and then the fixing plate 46 and the joining plate 41 are connected. It is fixed by surface contact.

In this optical transmitting / receiving module, the light output from the LD 32 is reflected by the micromirror 34 inclined at 45 degrees and changes its traveling direction upward. This light is a protective cover
After being reflected by the half mirror 38 of the quadrilateral prism 37 fixed to 36, condensed by the lens 42, and passed through the bonding plate 41 and the fixing plate 46, the optical fiber fixed to the precision capillary 43
It is incident on 44.

On the other hand, the light output from the optical fiber 44 is
After passing through the fixing plate 46 and the joining plate 41, the light is focused by the lens 42,
P is transmitted through the half mirror 38 and reflected by the reflection mirror 39.
It is incident on D33.

When assembling the module, the precision capillary 43 is moved in the axial direction of the adjustment ring 45 so that the light condensed by the lens 42 is accurately optically coupled to the optical fiber 44 by following the optical path correctly and fixed. Plate 46 is joined to Plate 41
Move in the in-plane direction to adjust the position. Then, at an appropriate position, the contact portion between the precision capillary 43 and the adjustment ring 45 and the contact portion between the fixing plate 46 and the joining plate 41 are fixed with an adhesive. At this time, the adjusting ring 45, the fixing plate 46, and the joining plate 41
Are made of transparent glass, so that the precision capillary 43 and the adjustment ring 45, and the fixing plate 46 and the joining plate
41 can be fixed with an ultraviolet curable resin.

In this optical transceiver module, since the silicon substrate 31 is provided with the micro mirror inclined at 45 degrees, the LD 32 can be mounted on a plane such that the light emission direction is parallel to the silicon substrate 31. The LD 32 can be arranged on the silicon substrate 31 without taking a height. Also, the PD 33 can be planarly mounted on the silicon substrate 31 due to its structure. Therefore, since both the LD 32 and the PD 33 can be mounted on the substrate 31 in the same manner, the thickness of the optical device can be reduced.

Further, in this module, since the lens 42 is commonly used for condensing the input and output light, the number of parts can be reduced, for example, only one is required.

The adjustment of the optical coupling between each semiconductor element and the optical fiber 44 at the time of assembling is performed by moving the fixing plate 46 fixed to the adjusting ring 45 in contact with the surface of the bonding plate 41 to select the optimum position. Can be implemented. At this time, since the bonding plate 41 and the fixing plate 46 are transparent plates, they can be surface-bonded to each other at an optimum position, and high reliability can be obtained by strong bonding force.

(Second Embodiment) The optical transceiver module according to the second embodiment has a function of monitoring the light quantity of the light emitting element.

In this optical transmitting / receiving module, as shown in FIG. 2, a pin photodiode (PD) 48 having a large light receiving diameter is arranged at a position on the silicon substrate where the reflected light of the light output from the LD 32 is incident. I have. The light receiving diameter of the PD 48 is set to be larger than the light receiving diameter of the PD 33. Other configurations are the same as those of the first embodiment (FIG. 1).

In this optical transmitting / receiving module, the light output from the LD 32 is reflected by the micromirror 34 and changes its traveling direction upward. Of the light traveling upward, less than 1% of the light 49 is reflected by the protective glass 36. In addition, protective glass 36
Part of the light that has passed through the mirror and reaches the half mirror 38 is transmitted through the half mirror 38, and the transmitted light 50 is reflected by the case cover 40 and travels toward the silicon substrate 1.

The light receiving diameter of the PD 33 is as small as 80 μm.
The light receiving diameter of D48 is 300 μm, which is 3.7 times the light receiving diameter of PD33.
Since the light receiving diameter is five times, more light of these reflected lights enters the PD 48.

Since the amount of light reflected by the protective glass 36 and the case cover 40 is proportional to the amount of radiation of the LD 32, the PD
The light 48 can be used as a light receiving element for monitoring the light amount of the LD 32, and the light emission amount of the LD 32 can be controlled based on the light reception amount of the PD 48.

(Third Embodiment) An optical transceiver module according to a third embodiment is configured so that more reflected light is incident on a pin photodiode that monitors the amount of light from a light emitting element.

In this optical transmitting / receiving module, as shown in FIG. 3, the inner wall surface 51 of the case cover 40 is inclined so that the distance from the PD 48 is longer than the distance from the PD 33. Other configurations are the same as those of the second embodiment (FIG. 2).

In this optical transmission / reception module, the light output from the LD 32 and reflected by the micromirror 44 passes through the protective glass 36, passes through the half mirror 38, and a part of the light is transmitted to the inner wall surface 51 of the case cover 40. Reach. Since the inner wall surface 51 is inclined as shown in FIG. 3, the light 52 reflected by the inner wall surface 51 is directed toward the PD 48, and more reflected light is incident on the PD 48. Therefore, the monitoring performance of the PD 48 is improved.

On the other hand, the reflected light 52 hardly enters the PD 33, so that noise can be reduced.

(Fourth Embodiment) In the optical transceiver module of the fourth embodiment, the optical path length from the light emitting element to the lens and the optical path length from the light receiving element to the lens are set to be equal.

In this optical transmitting / receiving module, as shown in FIG. 4, a PD 33 having a thickness of e2 is disposed on the upper surface of a silicon substrate 31 via a submount having a thickness of e3.
Is disposed on the bottom surface of the concave portion having the depth e1 of the silicon substrate 31. Other configurations are the same as those of the first embodiment (FIG. 1).

In this optical transmitting / receiving module, the LD 32
Distance d1 until light emitted from reaches lens 42
And the distance d2 until the light emitted from the lens 42 reaches the PD 33, the difference between the distances d2 and d1 is:
The distance from the top of the PD 33 to the protection cover 36 and the distance from the bottom of the recess where the LD 32 is placed to the protection cover 36 (because the slope of the micromirror is 45 degrees, the optical path length from the LD 32 to the protection cover 36 is protected from the bottom of the recess. And the distance between the half mirror 38 and the reflection mirror 39 in the quadrangle prism 37 (L1).
And the length is added.

In order to make the distances d1 and d2 as close as possible, and to make the optical path length from the LD 32 to the lens 42 equal to the optical path length from the PD 33 to the lens 42, in this optical transmitting / receiving module, (1) the LD 32 Silicon substrate 31
(2) P of thickness e2
D33 is mounted on a silicon substrate 41 by inserting a silicon submount 53 having a thickness of e3.
And a glass having a refractive index n = 1.7 is used.
The relationship of L1 / n = e1 + e2 + e3 is provided between e3, L1 and n.

By doing so, the PD 33 is moved from the lens 42
And the optical path length from the LD 32 to the lens 42 becomes the same, and the LD 32 and PD 33 and the optical fiber 44 can be optically coupled well.

(Fifth Embodiment) The optical transceiver module of the fifth embodiment has a small number of components and is easy to adjust during assembly.

As shown in FIG. 5, the optical transceiver module includes a silicon substrate 31 on which an LD 32 and a PD 33 are fixed,
A package 35 in which a silicon substrate 31 is fixed, a ceramic lens fixing member 59 in which a lens 57 and a lens 58 are fixedly adhered and arranged to cover the upper surface of the package 35, and a fiber formed by forming a groove. Embedded with a fiber embedded substrate 54, a half mirror 38 fixed by providing a cutting groove 55 in the substrate 54, a reflection mirror 39 bonded to an end surface of the substrate 54, and bonded to an opposite end surface of the substrate 54, A precision capillary 43 for holding the optical fiber 44 and a fiber position fixing member 60 for fixing the fiber embedded substrate 54 on the lens fixing member 59 are provided.

The fiber-embedded substrate 54 is made of a glass plate. A groove for embedding the fiber is formed in the glass plate with a dicing saw, and the optical fiber 44 extending from the precision capillary 43 is bonded and fixed. The precision capillary 43 adheres to the end face of the substrate 54.

The opposite end face of the fiber-embedded substrate 54 is polished at 45 degrees together with the optical fiber 44, and the reflection mirror 39 is bonded to this face 56. Also, the fiber embedded substrate 54
Width 30 inclined 45 degrees with respect to optical fiber 44 in the middle of
A cutting groove 55 of μm is formed by a dicing saw, and a half mirror 38 having a thickness of 20 μm is bonded and fixed to the groove 55.

The edges of the lens 57 and the lens 58 are bonded and fixed to two holes near the center of a lens fixing member 59 made of ceramic. The lens fixing member 59 is fixed to the case 35 to seal the inside of the case 35. The distance between these lenses 57 and 58 is
The length is set to be the same as the distance between the apparent light emitting point of the micromirror 34 and the PD 33. Also, the fiber embedded substrate 54
The distance between the reflection mirror 39 and the half mirror 38 provided at the same time is also the same.

At the time of assembly, the fiber-embedded substrate 54, the case 35 and the lens fixing member 59 are moved while adjusting the position of the optical fiber 44 so that the light emitted from the LD 31 finally enters the optical fiber 44. Then, it is fixed using a transparent fiber position fixing member 60.

In this optical transmission / reception module, the light emitted from the LD 31 is reflected upward by the micromirror 34, collected by the lens 57, reflected by the reflection mirror 39, input to the optical fiber 44, and propagated. You.

On the other hand, the light propagating through the optical fiber 44 is
Reflected by the half mirror 38, collected by the lens 58, PD
Enter 33.

The distance between the LD 32 and the lens 57 is PD
Although the distance between the lens 33 and the lens 58 is different, the lens 57 and the lens 58 are designed so that optimal optical coupling can be achieved in each use condition.

In this optical transmitting / receiving module, the apparent light emitting point of the LD 32 (light emitting point on the micromirror 34) and the PD
The distance between the LD 32 and the optical fiber 44 can be controlled at the time of assembly by mechanically configuring the distance between the LD 33 and the lens 57 and the distance between the half mirror 38 and the reflecting mirror 39 mechanically in advance. Just by coupling, PD33 and optical fiber
Optical coupling with 44 can be achieved simultaneously. Therefore, the number of adjustments at the time of assembly can be reduced.

Further, since the reflection mirror 39, the half mirror 38 and the optical fiber 44 are fixed to the same component, the number of components can be reduced.

In the case where the lens 57, the lens 58 and the lens fixing member 59 are integrally formed, the accuracy of the lens interval is improved and the number of parts can be further reduced.

(Sixth Embodiment) The optical transceiver module according to the sixth embodiment can reduce the number of lenses as compared with the fifth embodiment.

As shown in FIG. 6, the optical transceiver module includes a silicon substrate 31 on which an LD 32 and a PD 33 are fixed,
A package 35 in which a silicon substrate 31 is fixed, and a ball lens arranged so as to cover the upper surface of the package 35
A ceramic lens fixing member 59 to which 61 is adhered and fixed
A fiber-embedded substrate 54 in which grooves are formed and fibers are embedded, a half mirror 38 in which a cut groove 55 is provided in the substrate 54 and fixed, a reflection mirror 39 adhered to an end surface of the substrate 54, and a fiber-embedded substrate A precision capillary 43 adhered to the end face opposite to 54, a trapezoidal prism 62 and a reflection mirror 63 constituting a reflection surface so that light reflected by the half mirror 38 enters the PD 33 through the ball lens 61. .

The tip end surface 56 of the fiber-embedded substrate 54 is polished at 45 degrees together with the optical fiber 44, and a reflection mirror
Glue 39. A cutting groove 55 having a width of 30 μm and having a width of 22.5 degrees with respect to the optical fiber 44 is formed in the middle of the fiber-embedded substrate 54 by a dicing saw.
The half mirror 38 of 0 μm is fixed by bonding.

The trapezoidal prism 62 is a fiber embedded substrate
The optical fiber 44 is fixed to the side where the optical fiber 44 is embedded, and the reflection mirror 63 is fixed to the slope of the trapezoidal prism 62.

A lens fixing member to which the ball lens 61 is fixed
59 is fixed to the case 35 to seal the inside of the case.

In this optical transmitting / receiving module, the light output from the LD 32 is reflected by the micro mirror 34 and goes upward. The ball lens 61 is provided such that its central axis coincides with the optical axis of this light, and this light is
It is collected at 61. The collected light is reflected by the reflection plate 39 and enters the optical fiber 44.

On the other hand, the light propagating through the optical fiber 44 is
The light is reflected by the half mirror 38 and proceeds into the trapezoidal prism 62.
Light traveling into the trapezoidal prism 62 is reflected by the reflector 63,
The light is condensed by the ball lens 21 and enters the PD 33.

The ball lens 61 converges light whose center axis coincides with the optical axis with a minimum aberration regardless of the direction in which the light passes through the ball lens 61. LD32 and optical fiber
Since the optical axis when the optical fiber 44 is optically coupled matches the central axis of the ball lens 61, and the optical axis when the optical fiber 44 and the PD 33 are coupled also coincides with the central axis of the ball lens 61,
The best optical coupling can be obtained for each.

As described above, in this optical transceiver module, the LD 32 and the optical fiber 44, and the PD 33 and the optical fiber 44
Is performed using one ball lens 61, so that the number of components can be reduced. Also a ball lens
In 61, even when light enters obliquely, if the light passes through the center of the lens, lens aberration can be minimized, and good optical coupling can be realized.

[0071]

As is clear from the above description, the optical transceiver module of the present invention allows the light emitting element and the light receiving element to be mounted on a substrate in a plane, so that these semiconductor elements can be easily mounted. Further, the thickness of the optical device can be reduced.

Further, since a half mirror is used for splitting and reflecting light, the number of parts can be reduced.

Further, since the light emitting element and the light receiving element are fixed on the substrate so that the outgoing light and the incident light are directed in the same direction, the optical coupling between each semiconductor element and the optical fiber is individually adjusted during assembly. It is not necessary to perform the adjustment, and the adjustment work becomes easy.

In the module of the first embodiment,
Since the bonding plate 41 and the fixing plate 46 can be surface-bonded,
A highly reliable connection between the optical transceiver module and the optical fiber is possible.

Further, in the module of the second embodiment provided with the monitoring light receiving element, the light emission amount of the light emitting element can be controlled based on the monitoring result.

Further, a third case in which the inner wall surface of the case cover is inclined
In the module of the embodiment, the sensitivity of the monitor can be increased, while the noise added to the signal can be reduced.

In the module of the fourth embodiment,
By making the optical path lengths of the light emitting element, the light receiving element and the optical fiber the same, good optical coupling can be obtained.

Further, in the module of the fifth embodiment in which an optical fiber is embedded in a fiber-embedded substrate, the number of components can be reduced, and the number of adjustments of optical coupling can be reduced.

In the module according to the sixth embodiment using a ball lens, good optical coupling is ensured.
The number of lenses can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an optical transceiver module according to a first embodiment of the present invention;

FIG. 2 is a diagram showing a configuration of an optical transceiver module according to a second embodiment of the present invention;

FIG. 3 is a diagram illustrating a configuration of an optical transceiver module according to a third embodiment of the present invention;

FIG. 4 is a diagram showing a configuration of an optical transceiver module according to a fourth embodiment of the present invention;

FIG. 5 is a diagram showing a configuration of an optical transceiver module according to a fifth embodiment of the present invention;

FIG. 6 is a diagram showing a configuration of an optical transceiver module according to a sixth embodiment of the present invention;

FIG. 7 is a diagram showing a configuration of a conventional optical transceiver module.

[Description of Signs] 11 Case 12 Polarizing element 13 Ferrule 14, 44 Optical fiber 16A, 16B Package 17A, 17B, 42, 57, 58 Lens 18A, 18B Light emitting laser element 20A, 20B Stem 21A, 21B Polarizing plate 31 Silicon substrate 32 Semiconductor laser (LD) 33, 48 PIN photodiode (PD) 34 Micromirror 35 Package 36 Protective glass 37 Quadrilateral prism 38 Half mirror 39, 63 Reflective mirror 40 Case cover 41 Joining plate 43 Precision capillary 45 Adjustment ring 46 Fixing plate 47 Glass Plates 49, 50, 52 Reflected light 51 Inner wall surface of case cover 53 Submount 54 Fiber embedded substrate 55 Cutting groove 56 Polished surface 59 Lens fixing member 60 Fiber position fixing member 61 Ball lens 62 Trapezoidal prism

Claims (8)

[Claims] 1. An optical transceiver module for transmitting and receiving light transmitted bidirectionally through an optical fiber, a substrate having a 45-degree slope, a light-emitting element disposed adjacent to the slope of the substrate, and the light-emitting element. A light-receiving element for reception arranged on the same substrate surface as the light-receiving element, light emitted from the light-emitting element and reflected by the inclined surface being incident on an optical fiber, and light emitted from the optical fiber being received by the reception light-receiving element. An optical transmission / reception module comprising: an optical system for entering the element. 2. The optical system according to claim 1, wherein the optical system is provided with a half mirror inclined above one of the light emitting element or the light receiving element for reception, and a half mirror provided above the other of the light emitting element or the light receiving element for reception in parallel with the half mirror. And a condenser lens disposed in an optical path between the half mirror and the optical fiber, wherein the condenser lens, the half mirror, and the reflection mirror are linearly arranged in this order. The optical transceiver module according to claim 1, wherein: 3. The monitoring light receiving element for monitoring reflected light of light emitted from the light emitting element is disposed on the same substrate surface as the light emitting element. Optical transmission and reception module. 4. The optical transceiver module according to claim 3, wherein the light receiving diameter of the monitor light receiving element is larger than the light receiving diameter of the receiving light receiving element. 5. A plate that is inclined above the light emitting element so that the reflected light incident on the monitoring light receiving element increases and the reflected light incident on the receiving light receiving element decreases. The optical transmission / reception module according to claim 3 or 4, wherein: 6. A recess having the 45-degree slope is formed in the substrate, and the light emitting element is arranged on a bottom surface of the recess.
The receiving light receiving element is arranged on the substrate via a height adjusting member, and a distance from the bottom surface of the concave portion to a height of an upper surface of the receiving light receiving element is a distance between the half mirror and the reflection mirror. 3. The method according to claim 2, wherein the value is set to be substantially equal to a value obtained by dividing by a refractive index of the substance.
The optical transceiver module according to item 1. 7. A first light condensing lens disposed above one of the light emitting element or the light receiving element for reception, and a second light condensing lens disposed above the other of the light emitting element or the light receiving element for reception. A second condensing lens, a reflecting mirror provided inclined above the first condensing lens, and an end surface in contact with the reflecting mirror, and an upper surface above the first and second condensing lenses. An optical fiber extending in parallel with the substrate,
2. The light according to claim 1, further comprising: a cutting groove provided in the optical fiber at an angle near the upper part of the second condensing lens, and a half mirror disposed in the cutting groove. 3. Transmit / receive module. 8. The optical system, wherein one spherical lens disposed above the light-emitting element, a reflecting mirror inclined above the spherical lens, and an end surface in contact with the reflecting mirror, An optical fiber extending in parallel with the substrate above the lens, a cutting groove provided on the optical fiber at an angle, and a half mirror disposed in the cutting groove,
The optical transceiver module according to claim 1, further comprising a second reflection mirror that further reflects the light reflected by the half mirror and enters the light receiving element for reception through the spherical lens.