JP2008083282A - Optical module and its aligning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical module that has no reflection problem even if an inexpensive optical fiber with a vertical end face is used and that facilitates alignment, and also to provide an aligning method of the same. <P>SOLUTION: The optical module includes: one element of either an LD 3 for transmitting an optical signal or a PD 11 for receiving an optical signal; a stem 2 for mounting the element; an optical fiber 7 that is provided with a fiber end face 10 vertical to the longitudinal direction and that is optically coupled with the element; a ferrule collar 9 that holds the optical fiber 7, with the fiber end face 10 of the optical fiber 7 made parallel to a holding end face 9a; and a tubular housing 1 in which the stem 2 is attached to one end face 1a with the element inside and in which the holding end face 9a of the ferrule collar 9 is attached to the other end face 1b. In the formation of this optical module, the other end face 1b of the housing 1 is tilted at a prescribed angle to a face vertical to the optical axis 3a or the optical axis 11a of the element. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical module used in an optical transmission system, for example, an optical transmission module that only transmits an optical signal, an optical reception module that only receives an optical signal, an optical transmission and reception module that performs both transmission and reception of an optical signal, and the like. It is useful.

FIG. 5 is a cross-sectional view illustrating the configuration of a conventional optical module.
As shown in FIG. 5, the conventional optical module is attached to a cylindrical casing 41, a stem 42 attached to one end face of the casing 41, and the other end face (holding end face 46) of the casing 41. And a ferrule collar 49 that holds the optical fiber 47 via the ferrule 48. An optical element 43 used for transmission / reception of optical signals is mounted on the mounting surface of the stem 42 that is inside the housing 41, and a plurality of pins 44 that are electrically connected to the optical element 43 penetrate the stem 42. Is provided.

  The optical element 43 is optically coupled to an optical fiber 47 held by a ferrule collar 49 via a lens 45. In this optical coupling, the holding end surface 46 of the housing 41 has an optical axis 43a of the optical element 43 (hereinafter, a traveling direction of light incident or emitted perpendicularly to the surface of the optical element is defined as an optical axis of the optical element. The optical fiber 47 held by the holding end face 46 via the ferrule 48 and the ferrule collar 49 has its fiber end face 50 polished obliquely. The optical element 43 has a predetermined inclination angle with respect to the optical axis 43a. As described above, in the conventional optical module, the fiber end surface 50 is inclined with respect to the optical axis 43 a of the optical element 43, so that the reflection at the fiber end surface 50 is reflected, specifically, the fiber end surface 50 is reflected. This prevents a problem that light re-enters the photodiode or the like, or light emitted from the fiber end face 50 is reflected on the optical component and then re-enters the fiber end face 50.

JP-A-5-343709

  An optical fiber whose fiber end face is perpendicular to the longitudinal direction, that is, an optical fiber whose fiber end face is not tilted, is low in manufacturing cost. On the other hand, when guiding transmitted / received light, the fiber end face reflects light, etc. The problem was occurring. Therefore, in the conventional optical module, as shown in FIG. 5, an optical fiber whose fiber end face is inclined is used. However, a method such as oblique polishing that inclines the fiber end face of the optical fiber is technically difficult, and as a result, the manufacturing cost increases and the cost of the optical module itself increases.

  When an optical fiber having an inclined fiber end surface is used, the optical axis of the optical fiber (hereinafter, the traveling direction of light guided through the optical fiber is defined as the optical axis of the optical fiber) and the inside of the optical module. There has also been a problem that a deviation occurs from the optical axis of the optical element. In this case, in order to optically couple the optical fiber and the optical element with high efficiency, the mounting position of the lens cap with respect to the optical module needs to be offset from the reference position. Alignment) was difficult.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an optical module and an alignment method thereof that are easy to align even without using an inexpensive optical fiber having a vertical end face. .

An optical module according to a first invention for solving the above-described problem is
Any one of a transmitting element that transmits an optical signal or a receiving element that receives an optical signal;
A mounting housing for mounting the element;
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the element;
Holding means for holding the optical fiber with the fiber end face of the optical fiber parallel to the holding end face;
A cylindrical housing for attaching the mounting housing to one end face with the element facing inward and attaching the holding end face of the holding means to the other end face,
The other end surface of the cylindrical casing is formed to be inclined at a predetermined angle with respect to a surface perpendicular to the optical axis of the element.

An optical module according to a second invention for solving the above-described problem is
Any one of a transmitting element that transmits an optical signal or a receiving element that receives an optical signal;
A mounting housing for mounting the element, with the optical axis of the element perpendicular to the mounting surface;
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the element;
Holding means for holding the optical fiber with the fiber end face of the optical fiber parallel to the holding end face;
A cylindrical housing for attaching the mounting housing to one end face with the element facing inward and attaching the holding end face of the holding means to the other end face,
One end surface of the cylindrical housing is formed perpendicular to the longitudinal direction of the cylindrical housing, and the other end surface of the cylindrical housing is formed with respect to the longitudinal direction of the cylindrical housing. It is characterized by being formed at a predetermined angle with respect to a vertical plane.

An optical module according to a third invention for solving the above-described problem is
Any one of a transmitting element that transmits an optical signal or a receiving element that receives an optical signal;
A mounting housing for mounting the element;
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the element;
Holding means for holding the optical fiber;
A cylindrical housing that attaches the mounting housing to one end face with the element facing inward and that rotatably attaches the holding means to the other end face,
Forming the holding end surface of the holding means in contact with the other end surface of the cylindrical housing at a first predetermined angle with respect to the fiber end surface of the optical fiber;
The other end face of the cylindrical casing is formed to be inclined at a second predetermined angle with respect to a plane perpendicular to the optical axis of the element.

An optical module according to a fourth invention for solving the above-described problem is
Any one of a transmitting element that transmits an optical signal or a receiving element that receives an optical signal;
A mounting housing for mounting the element, with the optical axis of the element perpendicular to the mounting surface;
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the element;
Holding means for holding the optical fiber;
A cylindrical housing that attaches the mounting housing to one end face with the element facing inward and that rotatably attaches the holding means to the other end face,
Forming the holding end surface of the holding means in contact with the other end surface of the cylindrical housing at a first predetermined angle with respect to the fiber end surface of the optical fiber;
One end surface of the cylindrical housing is formed perpendicular to the longitudinal direction of the cylindrical housing, and the other end surface of the cylindrical housing is formed with respect to the longitudinal direction of the cylindrical housing. It is characterized by being formed to be inclined at a second predetermined angle with respect to a vertical surface.

An optical module according to a fifth invention for solving the above-described problem is
In the optical module according to any one of the first to fourth inventions,
When the element is a transmitting element that transmits an optical signal,
The predetermined angle or the sum of the first predetermined angle and the second predetermined angle is an angle at which a loss value of light output is 1 dBm or less.

An optical module according to a sixth invention for solving the above-described problem is
In the optical module according to any one of the first to fourth inventions,
When the element is a receiving element that receives an optical signal,
The predetermined angle or the sum of the first predetermined angle and the second predetermined angle is an angle at which a loss value of light input is 1 dB or less.

An optical module according to a seventh invention for solving the above-described problem is
A transmitting element for transmitting an optical signal and a receiving element for receiving an optical signal;
A mounting housing for mounting the transmitting element and the receiving element;
An optical fiber having a fiber end surface perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element;
Holding means for holding the optical fiber with the fiber end face of the optical fiber parallel to the holding end face;
A cylindrical housing for attaching the mounting housing to one end face with the transmitting element and the receiving element inside, and attaching the holding end face of the holding means to the other end face,
The other end face of the cylindrical casing is formed to be inclined at a predetermined angle with respect to a plane perpendicular to the optical axis of any one of the transmitting element and the receiving element.

An optical module according to an eighth invention for solving the above-described problems is
A transmitting element for transmitting an optical signal and a receiving element for receiving an optical signal;
A mounting housing for mounting the transmitting element and the receiving element, with the optical axis of any one of the transmitting element or the receiving element being perpendicular to the mounting surface;
An optical fiber having a fiber end surface perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element;
Holding means for holding the optical fiber with the fiber end face of the optical fiber parallel to the holding end face;
A cylindrical housing for attaching the mounting housing to one end face with the transmitting element and the receiving element inside, and attaching the holding end face of the holding means to the other end face,
One end surface of the cylindrical housing is formed perpendicular to the longitudinal direction of the cylindrical housing, and the other end surface of the cylindrical housing is formed with respect to the longitudinal direction of the cylindrical housing. It is characterized by being formed at a predetermined angle with respect to a vertical plane.

An optical module according to a ninth invention for solving the above-described problems is
A transmitting element for transmitting an optical signal and a receiving element for receiving an optical signal;
A mounting housing for mounting the transmitting element and the receiving element;
An optical fiber having a fiber end surface perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element;
Holding means for holding the optical fiber;
A cylindrical housing that attaches the mounting housing to one end face with the transmitting element and the receiving element inside, and that rotatably attaches the holding means to the other end face,
Forming the holding end surface of the holding means in contact with the other end surface of the cylindrical housing at a first predetermined angle with respect to the fiber end surface of the optical fiber;
The other end face of the cylindrical casing is formed to be inclined at a second predetermined angle with respect to a plane perpendicular to the optical axis of any one of the transmitting element and the receiving element.

An optical module according to a tenth aspect of the present invention for solving the above problems is
A transmitting element for transmitting an optical signal and a receiving element for receiving an optical signal;
A mounting housing for mounting the transmitting element and the receiving element, with the optical axis of any one of the transmitting element or the receiving element being perpendicular to the mounting surface;
An optical fiber having a fiber end surface perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element;
Holding means for holding the optical fiber;
A cylindrical housing that attaches the mounting housing to one end face with the transmitting element and the receiving element inside, and that rotatably attaches the holding means to the other end face,
Forming the holding end surface of the holding means in contact with the other end surface of the cylindrical housing at a first predetermined angle with respect to the fiber end surface of the optical fiber;
One end surface of the cylindrical housing is formed perpendicular to the longitudinal direction of the cylindrical housing, and the other end surface of the cylindrical housing is formed with respect to the longitudinal direction of the cylindrical housing. It is characterized by being formed to be inclined at a second predetermined angle with respect to a vertical surface.

An optical module according to an eleventh invention for solving the above-mentioned problems is
In the optical module according to any one of the seventh to tenth inventions,
A filter that transmits an optical signal to be transmitted and reflects an optical signal to be received is mounted on the mounting housing, and the optical fiber and the transmission element are optically coupled through the filter, and the optical fiber. And optically coupling the receiving element by reflecting the filter,
The predetermined angle or the sum of the first predetermined angle and the second predetermined angle is an angle at which the loss value on the light output side is 1 dBm or less.

An optical module alignment method according to a twelfth aspect of the present invention that solves the above-described problem,
A mounting element including a transmitting element that transmits an optical signal, a receiving element that receives the optical signal, and a filter that transmits the optical signal to be transmitted and reflects the optical signal to be received is mounted on the mounting case.
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element via the filter is held by holding means having a holding end face formed in parallel to the fiber end face. And
The mounting housing is attached to one end surface of the cylindrical housing with the transmitting element and the receiving element inside,
A holding end face of the holding means is attached to the other end face of the cylindrical housing formed to be inclined at a predetermined angle with respect to a plane perpendicular to the optical axis of the transmitting element, and alignment on the transmitting element side is performed. It is characterized by performing.

An optical module alignment method according to a thirteenth aspect of the present invention for solving the above problems is as follows.
A transmission element that transmits an optical signal, a reception element that receives an optical signal, and a filter that transmits the optical signal to be transmitted and reflects the optical signal to be received are mounted on a mounting housing. Support so that the optical axis is perpendicular to the mounting surface,
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element via the filter is held by holding means having a holding end face formed in parallel to the fiber end face. And
On one end surface of the cylindrical casing formed perpendicular to the longitudinal direction of the cylindrical casing, the mounting casing is attached with the transmitting element and the receiving element inside.
A holding end face of the holding means is attached to the other end face of the cylindrical casing formed at a predetermined angle with respect to a plane perpendicular to the longitudinal direction of the cylindrical casing, and the transmitting element side It is characterized in that the alignment is performed.

An optical module alignment method according to a fourteenth aspect of the present invention that solves the above-described problem,
A mounting element including a transmitting element that transmits an optical signal, a receiving element that receives the optical signal, and a filter that transmits the optical signal to be transmitted and reflects the optical signal to be received is mounted on the mounting case.
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element through the filter is inclined at a first predetermined angle with respect to the fiber end face. Holding the holding means having an end face,
The mounting housing is attached to one end surface of the cylindrical housing with the transmitting element and the receiving element inside,
The holding means is rotatably attached to the other end surface of the cylindrical housing formed to be inclined at a second predetermined angle with respect to a surface perpendicular to the optical axis of the transmitting element,
The holding means is rotated to perform alignment on the transmitting element side.

An optical module alignment method according to a fifteenth aspect of the present invention for solving the above problems is as follows.
A transmission element that transmits an optical signal, a reception element that receives an optical signal, and a filter that transmits the optical signal to be transmitted and reflects the optical signal to be received are mounted on a mounting housing. Support so that the optical axis is perpendicular to the mounting surface,
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element through the filter is inclined at a first predetermined angle with respect to the fiber end face. Holding the holding means having an end face,
On one end surface of the cylindrical casing formed perpendicular to the longitudinal direction of the cylindrical casing, the mounting casing is attached with the transmitting element and the receiving element inside.
The holding means is rotatably mounted on the other end surface of the cylindrical casing formed to be inclined at a second predetermined angle with respect to a plane perpendicular to the longitudinal direction of the cylindrical casing,
The holding means is rotated to perform alignment on the transmitting element side.

An optical module alignment method according to a sixteenth aspect of the present invention for solving the above problems is as follows.
In the optical module alignment method according to any one of the twelfth to fifteenth inventions,
The sum of the predetermined angle or the first predetermined angle and the second predetermined angle is an angle at which a loss value on the light output side is 1 dBm or less.

  According to the present invention, an optical fiber having a vertical fiber end face (not obliquely polished) is used as an optical fiber for guiding transmission / reception light by inclining the end face of the cylindrical housing on the side holding the optical fiber. Can be used, and the alignment between the optical fiber and the optical element can be easily performed without causing problems such as reflection on the fiber end face. Moreover, since the optical fiber with the vertical fiber end face is inexpensive, the member cost of the optical module can be reduced. In addition, since the cylindrical casing is usually a metal processing member, it can be molded by die molding or injection molding, and the member cost is further increased when the end surface of the cylindrical casing is inclined. There is nothing.

  An embodiment of an optical module according to the present invention will be described with reference to the drawings.

  FIG. 1A is a cross-sectional configuration diagram showing an example of an embodiment of an optical module according to the present invention.

  As shown in FIG. 1A, the optical module of this embodiment includes a cylindrical casing 1, a stem 2 (mounted casing) attached to one end surface 1 a of the casing 1, and a casing 1. And a ferrule collar 9 (holding means) for holding the optical fiber 7 via the ferrule 8. A laser diode (hereinafter abbreviated as LD) 3 serving as a transmitting element for transmitting an optical signal is mounted on the mounting surface 2a of the stem 2 inside the housing 1, and is electrically connected to the LD 3. A plurality of pins 4 are provided through the stem 2. As described above, the optical module according to the present embodiment is obtained by attaching the stem 2 to the end surface 1b of the housing 1 with the LD 3 inside, and attaching the holding end surface 9a of the ferrule collar 9 to the end surface 1b of the housing 1. . The casing 1, the ferrule 8, and the ferrule collar 9 are metal processed members, and it is desirable to use a material (SUS304, SF20T, etc.) suitable for YAG (Yttrium Aluminum Garnet) laser welding.

  In the optical module of the present embodiment, the lens 5 that collects light is supported by a cap 6, and has a structure that seals the periphery of the LD 3 by attaching the cap 6 to the mounting surface 2 a of the stem 2. . The optical fiber 7 held by the ferrule collar 9 is optically coupled to the LD 3 via the lens 5. In the optical module of the present embodiment, the optical fiber 7 has a fiber end face 10 formed perpendicular to the longitudinal direction thereof, and its manufacturing cost is low.

  If the optical fiber 7 having the vertical fiber end face 10 is used as it is, a problem such as reflection occurs on the fiber end face 10. Therefore, in the optical module of this embodiment, the housing 1 with which the holding end face 9 a of the ferrule collar 9 is in contact. The end face 1b is inclined at a predetermined angle with respect to the plane perpendicular to the optical axis 3a of the LD3. Specifically, in the optical module of the present embodiment, the ferrule collar 9 is configured to hold the optical fiber 7 so that the fiber end surface 10 is parallel to the holding end surface 9a, and the stem 2 is the LD 3 In this configuration, the LD 3 is supported so that the optical axis 3a is perpendicular to the mounting surface 2a. Further, the end surface 1 a of the housing 1 is formed perpendicular to the longitudinal direction of the housing 1, and the end surface 1 b of the housing 1 is predetermined with respect to a surface perpendicular to the longitudinal direction of the housing 1. It is a structure formed by being inclined at an angle.

  That is, the optical axis 3 a of the LD 3 is perpendicular to the mounting surface 2 a of the stem 2 and the end surface 1 a of the casing 1 is formed perpendicular to the longitudinal direction of the casing 1, whereby the optical axis 3 a of the LD 3 and the casing are formed. The longitudinal direction of the body 1 is the same. If the end surface 1b of the housing 1 is formed at a predetermined angle with respect to the surface perpendicular to the longitudinal direction of the housing 1, the end surface 1b of the housing 1 itself is a surface perpendicular to the optical axis 3a of the LD3. In contrast, the fiber end surface 10 of the optical fiber 7 attached to the end surface 1b of the housing 1 via the ferrule collar 9 is inclined at a predetermined angle with respect to the surface perpendicular to the optical axis 3a of the LD 3 as well. It will be inclined by a predetermined angle.

  Therefore, with the above configuration, even if the optical fiber 7 having the vertical fiber end face 10 is used, the optical module of this embodiment can prevent problems such as reflection on the fiber end face 10. The optical module shown in FIG. 1A is an optical module for transmission having an LD 3 as an optical element. In this case, if the inclination angle of the end face 1b of the housing 1 is too large, the optical module 7 is aligned. Since optical coupling sometimes becomes impossible, the angle at which the loss value of the optical output becomes 1 dBm or less, for example, the inclination angle of the end face 1b of the housing 1 with respect to the plane perpendicular to the optical axis 3a of the LD 3 is 0.5. It is desirable that the angle be about 1 ° to 1 °.

  Here, a method for aligning the optical module shown in FIG. 1A will be described.

(1) Mounting the LD 3 The LD 3 is mounted at the center of the mounting surface 2 a of the stem 2. At this time, adjustment is made so that the optical axis 3 a of the LD 3 is perpendicular to the mounting surface 2 a of the stem 2.

(2) Fixing of the cap 6 with the lens 5 The cap 6 with the lens 5 is fixed to the stem 2 on which the LD 3 is mounted. At this time, the position of the stem 2 is set such that the current flows through the LD 3 so that the center of the lens 5 and the light emitting point of the LD 3 are the same, that is, the center of the lens 5 and the optical axis 3a of the LD 3 coincide. After that, the cap 6 is fixed to the stem 2 by resistance welding.

(3) Fixing the stem 2 The stem 2 is fixed to the non-inclined end face 1a of the housing 1. At this time, the mounting surface 2a of the stem 2 is disposed so as to be inside the housing 1, and after the center of the stem 2 and the center of the housing 1 are aligned, the stem 2 is resistance-welded to the end surface 1a of the housing 1. And fix.

(4) Fixing of optical fiber 7 (alignment of optical fiber 7 and LD 3)
An optical fiber 7 having a fiber end face 10 formed perpendicular to the longitudinal direction and held by the ferrule 8 is fixed to the ferrule collar 9, and the ferrule collar 9 is fixed to the inclined end face 1 b of the housing 1. At this time, the holding end surface 9a of the ferrule collar 9 is opposed to the end surface 1b of the housing 1, and a current is supplied to the LD 3 to emit light, and the light intensity from the LD 3 incident on the optical fiber 7 is maximized. The planar position of the body 1 is adjusted, and then the optical fiber 7 is fixed to the ferrule collar 9 via the ferrule 8, and the ferrule collar 9 is fixed to the end face 1 b of the housing 1.

  For example, the above adjustment may be performed using a centering device having a gimbal mechanism such as an air floating type or a spring floating type. Specifically, the optical fiber 7 held by the fiber chuck of the alignment device via the ferrule 8 and the ferrule collar chuck of the alignment device with respect to the stem 2 fixed to the housing 1 by the gimbal mechanism. The optical axis of the held ferrule collar 9 is kept vertical and the XYZ axes are aligned by the alignment device. When the position where the maximum optical coupling can be obtained in the optical fiber 7 is determined by the alignment of the XYZ axes, the Z axis is through-welded by YAG laser welding. Then, XY alignment is performed again, and when the position where the maximum optical coupling can be obtained is determined in the optical fiber 7, the XY axes are fillet welded by YAG laser welding.

  Therefore, by using the above-mentioned alignment method, it is not necessary to perform the θ alignment that was conventionally required for the alignment between the LD 3 and the optical fiber 7, and the alignment is facilitated. Also, the method of fixing the cap 6 with the lens 5 does not require the conventional offset adjustment, and the working time can be shortened compared to the conventional method. The alignment method described above can also be applied to the optical module shown in FIG.

  FIG. 1B is a cross-sectional configuration diagram illustrating an example of an embodiment of an optical module according to the present invention, and corresponds to a modification of the optical module illustrated in FIG. Accordingly, in the optical module shown in FIG. 1B, the same components as those in the optical module shown in FIG.

  As shown in FIG. 1 (b), the optical module of the present embodiment replaces the LD 3 of the optical module shown in FIG. 1 (a) with a photodiode (hereinafter abbreviated as PD) 11 that receives an optical signal. The end surface 1b of the housing 1 that is mounted on the mounting surface 2a of the stem 2 and is in contact with the holding end surface 9a of the ferrule collar 9 is formed to be inclined at a predetermined angle with respect to the surface perpendicular to the optical axis 11a of the PD 11. Yes. Specifically, in the optical module of the present embodiment, the ferrule collar 9 is configured to hold the optical fiber 7 so that the fiber end face 10 is parallel to the holding end face 9a, and the stem 2 is the PD 11 The PD 11 is supported such that the optical axis 11a is perpendicular to the mounting surface 2a, and the end surface 1a of the housing 1 is formed perpendicular to the longitudinal direction of the housing 1, and the housing The end face 1b of 1 is configured to be inclined at a predetermined angle with respect to a plane perpendicular to the longitudinal direction of the housing 1.

  That is, by forming the optical axis 11a of the PD 11 perpendicular to the mounting surface 2a of the stem 2 and forming the end surface 1a of the casing 1 perpendicular to the longitudinal direction of the casing 1, the optical axis 11a of the PD 11 and the casing The longitudinal direction of the body 1 is the same. If the end surface 1b of the housing 1 is formed at a predetermined angle with respect to the surface perpendicular to the longitudinal direction of the housing 1, the end surface 1b of the housing 1 itself is a surface perpendicular to the optical axis 11a of the PD 11. With respect to the surface perpendicular to the optical axis 11a of the PD 11, the fiber end surface 10 of the optical fiber 7 attached to the end surface 1b of the housing 1 via the ferrule collar 9 is also inclined with respect to the surface. It will be inclined by a predetermined angle.

  Therefore, with the above configuration, even if the optical fiber 7 having the vertical fiber end face 10 is used, the optical module of this embodiment can prevent problems such as reflection on the fiber end face 10. The optical module shown in FIG. 1B is a receiving optical module having the PD 11 as an optical element. In this case, an angle at which the loss value of the optical input is 1 dB or less, for example, the optical axis of the PD 11 It is desirable that the inclination angle of the end surface 1b of the housing 1 is about 2 ° to 6 ° with respect to the surface perpendicular to 11a. In general, PD can secure a sufficient light receiving sensitivity even if it receives light with a certain inclination with respect to the light receiving surface. Therefore, the allowable range of the inclination angle is larger than that of LD. In order to prevent reflection, it is desirable to make an angle larger than LD.

  FIGS. 2A and 2B are cross-sectional configuration diagrams showing another example of the embodiment of the optical module according to the present invention, and the optical module shown in Example 1 (FIGS. 1A and 1B). It corresponds to the modified example. Accordingly, in the optical modules shown in FIGS. 2A and 2B, the same components as those in the optical modules shown in FIGS. 1A and 1B are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 2 (a) and 2 (b), the optical module of this embodiment is a transmitting / receiving element that transmits and receives optical signals instead of the LD 3 and PD 11 of the optical module shown in FIGS. 1 (a) and 1 (b). 21 is mounted on the mounting surface 2 a of the stem 2, and is a single-fiber bidirectional optical transmission / reception module that transmits and receives an optical signal using a single optical fiber 7. As shown in FIG. 2B, the transmission / reception element 21 includes an LD 23, a PD 24, and a filter 25 that transmits the signal light from the LD 23 and reflects the signal light from the optical fiber 7. With the above configuration, the signal light emitted from the LD 23 is optically coupled to the optical fiber 7 by passing through the filter 25, and the signal light incident from the optical fiber 7 is optically coupled to the PD 24 by reflecting the filter 25. Will be.

  Also in the optical module of the present embodiment, the optical fiber 7 having the vertical fiber end surface 10 can be used, so that the end surface 1b of the housing 1 with which the holding end surface 9a of the ferrule collar 9 is in contact with the LD 23 inside the transmitting / receiving element 21 It is formed at a predetermined angle with respect to a plane perpendicular to the optical axis 23a. Specifically, in the optical module of the present embodiment, the ferrule collar 9 is configured to hold the optical fiber 7 so that the fiber end face 10 is parallel to the holding end face 9a, and the stem 2 is the LD 23. The structure is such that the transmitting / receiving element 21 having the LD 23 is supported so that the optical axis 23a is perpendicular to the mounting surface 2a, and the end surface 1a of the housing 1 is formed perpendicular to the longitudinal direction of the housing 1. In addition, the end surface 1 b of the housing 1 is configured to be inclined at a predetermined angle with respect to a surface perpendicular to the longitudinal direction of the housing 1.

  That is, the optical axis 23 a of the LD 23 is perpendicular to the mounting surface 2 a of the stem 2, and the end surface 1 a of the casing 1 is formed perpendicular to the longitudinal direction of the casing 1. The longitudinal direction of the body 1 is the same. If the end surface 1b of the housing 1 is formed at a predetermined angle with respect to the surface perpendicular to the longitudinal direction of the housing 1, the end surface 1b of the housing 1 itself is a surface perpendicular to the optical axis 23a of the LD 23. With respect to the surface perpendicular to the optical axis 23a of the LD 23, the fiber end surface 10 of the optical fiber 7 attached to the end surface 1b of the housing 1 via the ferrule collar 9 is also inclined with respect to the surface perpendicular to the optical axis 23a. It will be inclined by a predetermined angle.

  Therefore, with the above configuration, even if the optical fiber 7 having the vertical fiber end face 10 is used, the optical module of this embodiment can prevent problems such as reflection on the fiber end face 10. As shown in FIGS. 1 (a) and 1 (b), the optimum inclination angles with respect to LD3 and PD11 are different from each other. Therefore, in the present embodiment, the end face 1b is adjusted to an angle optimal for the LD 23 side having a small tilt angle (an angle at which the loss value on the light output side is 1 dBm or less, for example, 0.5 ° to 1 °). The PD 24 is tilted and the angle of the filter 25 is adjusted in consideration of the tilt angle, and the PD 24 is optically coupled with high efficiency. The arrangement positions of the LD 23 and the PD 24 may be reversed.

  Here, a method for aligning the optical modules shown in FIGS. 2A and 2B will be described.

(1) Mounting of Transmitting / Receiving Element 21 The transmitting / receiving element 21 having the LD 23, the PD 24, and the filter 25 is mounted at the center of the mounting surface 2a of the stem 2. At this time, adjustment is made so that the optical axis 23 a of the LD 23 is perpendicular to the mounting surface 2 a of the stem 2.

(2) Fixing of Cap 6 with Lens 5 The cap 6 with lens 5 is fixed to the stem 2 on which the transmitting / receiving element 21 is mounted. At this time, a current is passed through the LD 23 to emit light, and the position of the stem 2 is set so that the center of the lens 5 and the light emitting point of the LD 23 are the same, that is, the center of the lens 5 and the optical axis 23a of the LD 23 coincide. After that, the cap 6 is fixed to the stem 2 by resistance welding.

(3) Fixing the stem 2 The stem 2 is fixed to the non-inclined end face 1a of the housing 1. At this time, the mounting surface 2a of the stem 2 is disposed so as to be inside the housing 1, and after the center of the stem 2 and the center of the housing 1 are aligned, the stem 2 is resistance-welded to the end surface 1a of the housing 1. And fix.

(4) Fixing of optical fiber 7 (alignment of optical fiber 7 and LD 23)
An optical fiber 7 having a fiber end face 10 formed perpendicular to the longitudinal direction and held by the ferrule 8 is fixed to the ferrule collar 9, and the ferrule collar 9 is fixed to the inclined end face 1 b of the housing 1. At this time, the holding end surface 9a of the ferrule collar 9 is opposed to the end surface 1b of the housing 1, and a current is passed through the LD 23 to emit light so that the light intensity from the LD 23 incident on the optical fiber 7 is maximized. The planar position of the body 1 is adjusted, and then the optical fiber 7 is fixed to the ferrule collar 9 via the ferrule 8, and the ferrule collar 9 is fixed to the end face 1 b of the housing 1.

  For example, the above adjustment may be performed using a centering device having a gimbal mechanism such as an air floating type or a spring floating type. Specifically, the optical fiber 7 held by the fiber chuck of the alignment device via the ferrule 8 and the ferrule collar chuck of the alignment device with respect to the stem 2 fixed to the housing 1 by the gimbal mechanism. The optical axis of the held ferrule collar 9 is kept vertical and the XYZ axes are aligned by the alignment device. When the position where the maximum optical coupling can be obtained in the optical fiber 7 is determined by the alignment of the XYZ axes, the Z axis is through-welded by YAG laser welding. Then, XY alignment is performed again, and when the position where the maximum optical coupling can be obtained is determined in the optical fiber 7, the XY axes are fillet welded by YAG laser welding.

  Therefore, the alignment between the optical fiber 7 and the LD 23 and PD 24 is facilitated by using the alignment method. Also, offset adjustment is easier than in the past.

  FIG. 3 is a cross-sectional configuration diagram showing another example of the embodiment of the optical module according to the present invention, FIG. 3 (a) is a diagram at a minimum inclination angle, and FIG. 3 (b) is a maximum inclination angle. FIG.

  In addition, in the optical module shown to FIG. 3 (a), (b), it is equivalent to the optical module shown in Example 1, 2 (FIG. 1 (a), (b), FIG. 2 (a), (b)). The same reference numerals are given to the configurations, and duplicate descriptions are omitted. In the present embodiment, the optical element is used as the transmission / reception element 21 as an example. However, as shown in the first and second embodiments, the transmission / reception element 21 may be replaced with the LD 3 and the PD 11.

  As shown in FIGS. 3A and 3B, in the optical module of this embodiment, the transmitting / receiving element 21 that transmits and receives an optical signal is mounted on the mounting surface 2a of the stem 2 in the same manner as the optical module shown in the second embodiment. A single-fiber bidirectional optical transceiver module that transmits and receives optical signals using a single optical fiber 7. As shown in FIG. 2B, the transmission / reception element 21 includes an LD 23, a PD 24, and a filter 25, and the optical fiber 7, the LD 23, and the PD 24 are optically coupled via the filter 25.

  In the optical module of the present embodiment, in order to use the optical fiber 7 having the vertical fiber end surface 10, the holding end surface 31 a of the ferrule collar 31 (holding means) that holds the optical fiber 7 through the ferrule 8 is provided. The end surface 1b of the housing 1 which is formed to be inclined by a first predetermined angle (θ1) with respect to the fiber end surface 10 of the optical fiber 7 and is in contact with the holding end surface 31a of the ferrule collar 31 is also the light of the LD 23 inside the transmitting / receiving element 21 It is formed to be inclined by a second predetermined angle (θ2) with respect to a plane perpendicular to the shaft 23a. In addition, the ferrule collar 31 is rotatably attached to the end surface 1b of the housing 1 with the longitudinal direction as a rotation axis.

  The above configuration will be described in an organized manner. In the optical module of the present embodiment, the ferrule collar 31 is configured to hold the optical fiber 7 by tilting the holding end surface 31a with respect to the fiber end surface 10, and the stem 2 Is configured to support the transmitting / receiving element 21 having the LD 23 so that the optical axis 23 a of the LD 23 is perpendicular to the mounting surface 2 a, and the end surface 1 a of the housing 1 further extends in the longitudinal direction of the housing 1. The end surface 1 b of the housing 1 is formed so as to be inclined with respect to a surface perpendicular to the longitudinal direction of the housing 1.

  That is, the optical axis 23 a of the LD 23 is perpendicular to the mounting surface 2 a of the stem 2, and the end surface 1 a of the casing 1 is formed perpendicular to the longitudinal direction of the casing 1. The longitudinal direction of the body 1 is the same. If the end surface 1b of the housing 1 is formed at a second predetermined angle with respect to a surface perpendicular to the longitudinal direction of the housing 1, the end surface 1b of the housing 1 itself is perpendicular to the optical axis 23a of the LD 23. The fiber end surface 10 of the optical fiber 7 attached to the end surface 1b of the housing 1 through the ferrule collar 31 is also a surface perpendicular to the optical axis 23a of the LD 23. It will be inclined.

  Further, in the optical module of the present embodiment, the holding end face 31a of the ferrule collar 31 is formed to be inclined at a first predetermined angle with respect to the fiber end face 10 of the optical fiber 7, and the casing 1 in which the ferrule collar 31 is inclined. Since the ferrule collar 31 is rotated, the inclination angle of the fiber end surface 10 of the optical fiber 7 with respect to the surface perpendicular to the optical axis 23a of the LD 23 can be adjusted to an arbitrary angle. it can.

  Therefore, with the above configuration, even if the optical fiber 7 having the vertical fiber end face 10 is used, the optical module of this embodiment can prevent problems such as reflection on the fiber end face 10.

  The inclination angle of the fiber end face 10 of the fiber 7 can be adjusted by the rotation of the ferrule collar 31. As the minimum inclination angle serving as a reference position for adjustment, for example, the optical axis 23a of the LD 23 can be adjusted with respect to a plane perpendicular to the optical axis 23a. The inclination angle of the fiber end face 10 of the fiber 7 is preferably 0 ° (see FIG. 3A). In this case, the first predetermined angle θ1 of the holding end surface 31a of the ferrule collar 31 is equal to or larger than the second predetermined angle θ2 of the end surface 1b of the housing 1, that is, [θ1 ≧ θ2]. That's fine. The maximum inclination angle is the sum of the first predetermined angle θ1 of the holding end surface 31a of the ferrule collar 31 and the second predetermined angle θ2 of the end surface 1b of the housing 1, that is, [θ1 + θ2]. Here, FIG. 3B shows a state in which the ferrule collar 31 is rotated to the maximum inclination angle. When the LD 3 shown in FIG. 1A is used as an optical element, the sum of the first predetermined angle θ1 and the second predetermined angle θ2 is an angle at which the loss value of the optical output is 1 dBm or less. For example, the angle may be set to 0.5 ° to 1 °, and when the PD 11 shown in FIG. 1B is used as an optical element, the sum of the first predetermined angle θ1 and the second predetermined angle θ2 is calculated as light. An angle at which the input loss value is 1 dB or less, for example, 2 ° to 6 ° may be set.

  Note that the transmitting / receiving element 21 in this embodiment has an LD 23 and a PD 24 (see FIG. 2B). In such a case, as in the second embodiment, the transmission / reception element 21 is optimal for the LD 23 side having a small tilt angle. The sum of the first predetermined angle θ1 and the second predetermined angle θ2 is 0.5 in accordance with the angle (an angle at which the loss value on the light output side is 1 dBm or less, for example, 0.5 ° to 1 °). Each member is formed so that the angle is between 1 ° and 1 °, the LD 23 side is adjusted so as to be optically coupled with high efficiency by the rotation of the ferrule collar 31, and the PD 24 side is configured to adjust the inclination angle of the fiber end surface 10 of the fiber 7 Considering this, the angle of the filter 25 is adjusted to achieve optical coupling with high efficiency. The arrangement positions of the LD 23 and the PD 24 may be reversed.

  Here, a method for aligning the optical module shown in FIGS. 3A and 3B will be described.

(1) Mounting of Transmitting / Receiving Element 21 The transmitting / receiving element 21 having the LD 23, the PD 24, and the filter 25 is mounted at the center of the mounting surface 2a of the stem 2. At this time, adjustment is made so that the optical axis 23 a of the LD 23 is perpendicular to the mounting surface 2 a of the stem 2.

(2) Fixing of Cap 6 with Lens 5 The cap 6 with lens 5 is fixed to the stem 2 on which the transmitting / receiving element 21 is mounted. At this time, a current is passed through the LD 23 to emit light, and the position of the stem 2 is set so that the center of the lens 5 and the light emitting point of the LD 23 are the same, that is, the center of the lens 5 and the optical axis 23a of the LD 23 coincide. After that, the cap 6 is fixed to the stem 2 by resistance welding.

(3) Fixing the stem 2 The stem 2 is fixed to the non-inclined end face 1a of the housing 1. At this time, the mounting surface 2a of the stem 2 is disposed so as to be inside the housing 1, and after the center of the stem 2 and the center of the housing 1 are aligned, the stem 2 is resistance-welded to the end surface 1a of the housing 1. And fix.

(4) Adjustment of Ferrule Collar 31 The optical fiber 7 having a fiber end face 10 formed perpendicular to the longitudinal direction, the optical fiber 7 held by the ferrule 8 is fixed to the ferrule collar 31, and the ferrule collar 31 is attached to the housing 1. It fixes to the inclined end surface 1b. At this time, the holding end face 31a of the ferrule collar 31 faces the end face 1b of the housing 1, and a current is passed through the LD 23 to emit light, so that the light intensity from the LD 23 incident on the optical fiber 7 is maximized. The planar position and the rotation angle of the body 1 are adjusted, and then the optical fiber 7 is fixed to the ferrule collar 31 via the ferrule 8, and the ferrule collar 31 is fixed to the end face 1 b of the housing 1.

  For example, the above adjustment may be performed using a centering device having a gimbal mechanism such as an air floating type or a spring floating type. Specifically, the optical fiber 7 held by the fiber chuck 35 of the alignment device via the ferrule 8 and the ferrule color chuck of the alignment device with respect to the stem 2 fixed to the housing 1 by the gimbal mechanism. The optical axis of the ferrule collar 31 held at 36 is kept vertical, and the alignment of the XYZθ axes is performed by the alignment device. At this time, the Z-axis is aligned by the fiber chuck 35, and the XYθ axes are aligned by the chuck 37 with a gimbal mechanism of the alignment device that holds the housing 1. When the position where the maximum optical coupling can be obtained in the optical fiber 7 is determined by the alignment of the XYZθ axes, the Z-axis is welded through by YAG laser welding. Then, XY alignment is performed again, and when the position where the maximum optical coupling can be obtained in the optical fiber 7 is determined, fillet welding of the XY axes is performed by YAG laser welding (see FIGS. 4A and 4B). .

  Therefore, the alignment between the optical fiber 7 and the LD 23 and PD 24 is facilitated by using the alignment method.

It is a section lineblock diagram showing an example (example 1) of an embodiment of an optical module concerning the present invention. It is a cross-sectional block diagram which shows another example (Example 2) of embodiment of the optical module which concerns on this invention. It is a cross-sectional block diagram which shows another example (Example 3) of embodiment of the optical module which concerns on this invention. It is a figure explaining the alignment method of the optical module shown in FIG. It is a cross-sectional block diagram which shows the structure of the conventional optical module.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing | casing 1a, 1b End surface 2 Stem 2a Mounting surface 3, 23 LD (laser diode)
3a, 11a, 23a Optical axis 4 Pin 5 Lens 6 Cap 7 Optical fiber 8 Ferrule 9 Ferrule collar 9a Holding end face 10 Fiber end face 11, 24 PD (photodiode)
21 Transceiver 25 Filter 31 Ferrule color

Claims (16)

Any one of a transmitting element that transmits an optical signal or a receiving element that receives an optical signal;
A mounting housing for mounting the element;
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the element;
Holding means for holding the optical fiber with the fiber end face of the optical fiber parallel to the holding end face;
A cylindrical housing for attaching the mounting housing to one end face with the element facing inward and attaching the holding end face of the holding means to the other end face,
An optical module, wherein the other end surface of the cylindrical casing is formed at a predetermined angle with respect to a surface perpendicular to the optical axis of the element. Any one of a transmitting element that transmits an optical signal or a receiving element that receives an optical signal;
A mounting housing for mounting the element, with the optical axis of the element perpendicular to the mounting surface;
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the element;
Holding means for holding the optical fiber with the fiber end face of the optical fiber parallel to the holding end face;
A cylindrical housing for attaching the mounting housing to one end face with the element facing inward and attaching the holding end face of the holding means to the other end face,
One end surface of the cylindrical housing is formed perpendicular to the longitudinal direction of the cylindrical housing, and the other end surface of the cylindrical housing is formed with respect to the longitudinal direction of the cylindrical housing. An optical module formed by inclining a predetermined angle with respect to a vertical plane. Any one of a transmitting element that transmits an optical signal or a receiving element that receives an optical signal;
A mounting housing for mounting the element;
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the element;
Holding means for holding the optical fiber;
A cylindrical housing that attaches the mounting housing to one end face with the element facing inward and that rotatably attaches the holding means to the other end face,
Forming the holding end surface of the holding means in contact with the other end surface of the cylindrical housing at a first predetermined angle with respect to the fiber end surface of the optical fiber;
An optical module, wherein the other end surface of the cylindrical housing is formed to be inclined at a second predetermined angle with respect to a surface perpendicular to the optical axis of the element. Any one of a transmitting element that transmits an optical signal or a receiving element that receives an optical signal;
A mounting housing for mounting the element, with the optical axis of the element perpendicular to the mounting surface;
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the element;
Holding means for holding the optical fiber;
A cylindrical housing that attaches the mounting housing to one end face with the element facing inward and that rotatably attaches the holding means to the other end face,
Forming the holding end surface of the holding means in contact with the other end surface of the cylindrical housing at a first predetermined angle with respect to the fiber end surface of the optical fiber;
One end surface of the cylindrical housing is formed perpendicular to the longitudinal direction of the cylindrical housing, and the other end surface of the cylindrical housing is formed with respect to the longitudinal direction of the cylindrical housing. An optical module formed by inclining at a second predetermined angle with respect to a vertical surface. The optical module according to any one of claims 1 to 4,
When the element is a transmitting element that transmits an optical signal,
An optical module characterized in that the predetermined angle or the sum of the first predetermined angle and the second predetermined angle is an angle at which an optical output loss value is 1 dBm or less. The optical module according to any one of claims 1 to 4,
When the element is a receiving element that receives an optical signal,
An optical module, wherein the predetermined angle or the sum of the first predetermined angle and the second predetermined angle is an angle at which an optical input loss value is 1 dB or less. A transmitting element for transmitting an optical signal and a receiving element for receiving an optical signal;
A mounting housing for mounting the transmitting element and the receiving element;
An optical fiber having a fiber end surface perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element;
Holding means for holding the optical fiber with the fiber end face of the optical fiber parallel to the holding end face;
A cylindrical housing for attaching the mounting housing to one end face with the transmitting element and the receiving element inside, and attaching the holding end face of the holding means to the other end face,
An optical module, wherein the other end face of the cylindrical casing is formed at a predetermined angle with respect to a plane perpendicular to the optical axis of either the transmitting element or the receiving element. A transmitting element for transmitting an optical signal and a receiving element for receiving an optical signal;
A mounting housing for mounting the transmitting element and the receiving element, with the optical axis of any one of the transmitting element or the receiving element being perpendicular to the mounting surface;
An optical fiber having a fiber end surface perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element;
Holding means for holding the optical fiber with the fiber end face of the optical fiber parallel to the holding end face;
A cylindrical housing for attaching the mounting housing to one end face with the transmitting element and the receiving element inside, and attaching the holding end face of the holding means to the other end face,
One end surface of the cylindrical housing is formed perpendicular to the longitudinal direction of the cylindrical housing, and the other end surface of the cylindrical housing is formed with respect to the longitudinal direction of the cylindrical housing. An optical module formed by inclining a predetermined angle with respect to a vertical plane. A transmitting element for transmitting an optical signal and a receiving element for receiving an optical signal;
A mounting housing for mounting the transmitting element and the receiving element;
An optical fiber having a fiber end surface perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element;
Holding means for holding the optical fiber;
A cylindrical housing that attaches the mounting housing to one end face with the transmitting element and the receiving element inside, and that rotatably attaches the holding means to the other end face,
Forming the holding end surface of the holding means in contact with the other end surface of the cylindrical housing at a first predetermined angle with respect to the fiber end surface of the optical fiber;
An optical module characterized in that the other end face of the cylindrical casing is inclined at a second predetermined angle with respect to a plane perpendicular to the optical axis of any one of the transmitting element and the receiving element. . A transmitting element for transmitting an optical signal and a receiving element for receiving an optical signal;
A mounting housing for mounting the transmitting element and the receiving element, with the optical axis of any one of the transmitting element or the receiving element being perpendicular to the mounting surface;
An optical fiber having a fiber end surface perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element;
Holding means for holding the optical fiber;
A cylindrical housing that attaches the mounting housing to one end face with the transmitting element and the receiving element inside, and that rotatably attaches the holding means to the other end face,
Forming the holding end surface of the holding means in contact with the other end surface of the cylindrical housing at a first predetermined angle with respect to the fiber end surface of the optical fiber;
One end surface of the cylindrical housing is formed perpendicular to the longitudinal direction of the cylindrical housing, and the other end surface of the cylindrical housing is formed with respect to the longitudinal direction of the cylindrical housing. An optical module formed by inclining at a second predetermined angle with respect to a vertical surface. The optical module according to any one of claims 7 to 10,
A filter that transmits an optical signal to be transmitted and reflects an optical signal to be received is mounted on the mounting housing, and the optical fiber and the transmission element are optically coupled through the filter, and the optical fiber. And optically coupling the receiving element by reflecting the filter,
An optical module characterized in that the predetermined angle or the sum of the first predetermined angle and the second predetermined angle is an angle at which the loss value on the light output side is 1 dBm or less. A mounting element including a transmitting element that transmits an optical signal, a receiving element that receives the optical signal, and a filter that transmits the optical signal to be transmitted and reflects the optical signal to be received is mounted on the mounting case.
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element via the filter is held by holding means having a holding end face formed in parallel to the fiber end face. And
The mounting housing is attached to one end surface of the cylindrical housing with the transmitting element and the receiving element inside,
A holding end face of the holding means is attached to the other end face of the cylindrical housing formed to be inclined at a predetermined angle with respect to a plane perpendicular to the optical axis of the transmitting element, and alignment on the transmitting element side is performed. A method for aligning an optical module, characterized in that: A transmission element that transmits an optical signal, a reception element that receives an optical signal, and a filter that transmits the optical signal to be transmitted and reflects the optical signal to be received are mounted on a mounting housing. Support so that the optical axis is perpendicular to the mounting surface,
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element via the filter is held by holding means having a holding end face formed in parallel to the fiber end face. And
On one end surface of the cylindrical casing formed perpendicular to the longitudinal direction of the cylindrical casing, the mounting casing is attached with the transmitting element and the receiving element inside.
A holding end face of the holding means is attached to the other end face of the cylindrical casing formed at a predetermined angle with respect to a plane perpendicular to the longitudinal direction of the cylindrical casing, and the transmitting element side A method for aligning an optical module, characterized in that: A mounting element including a transmitting element that transmits an optical signal, a receiving element that receives the optical signal, and a filter that transmits the optical signal to be transmitted and reflects the optical signal to be received is mounted on the mounting case.
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element through the filter is inclined at a first predetermined angle with respect to the fiber end face. Holding the holding means having an end face,
The mounting housing is attached to one end surface of the cylindrical housing with the transmitting element and the receiving element inside,
The holding means is rotatably attached to the other end surface of the cylindrical housing formed to be inclined at a second predetermined angle with respect to a surface perpendicular to the optical axis of the transmitting element,
An alignment method for an optical module, wherein the holding means is rotated to perform alignment on the transmitting element side. A transmission element that transmits an optical signal, a reception element that receives an optical signal, and a filter that transmits the optical signal to be transmitted and reflects the optical signal to be received are mounted on a mounting housing. Support so that the optical axis is perpendicular to the mounting surface,
An optical fiber having a fiber end face perpendicular to the longitudinal direction and optically coupled to the transmitting element and the receiving element through the filter is inclined at a first predetermined angle with respect to the fiber end face. Holding the holding means having an end face,
On one end surface of the cylindrical casing formed perpendicular to the longitudinal direction of the cylindrical casing, the mounting casing is attached with the transmitting element and the receiving element inside.
The holding means is rotatably mounted on the other end surface of the cylindrical casing formed to be inclined at a second predetermined angle with respect to a plane perpendicular to the longitudinal direction of the cylindrical casing,
An alignment method for an optical module, wherein the holding means is rotated to perform alignment on the transmitting element side. The optical module alignment method according to any one of claims 12 to 15,
An alignment method for an optical module, characterized in that the predetermined angle or the sum of the first predetermined angle and the second predetermined angle is an angle at which a loss value on the light output side is 1 dBm or less.

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