JP2003279808A - Optical transmission/reception module - Google Patents

Optical transmission/reception module

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Publication number
JP2003279808A
JP2003279808A JP2002083791A JP2002083791A JP2003279808A JP 2003279808 A JP2003279808 A JP 2003279808A JP 2002083791 A JP2002083791 A JP 2002083791A JP 2002083791 A JP2002083791 A JP 2002083791A JP 2003279808 A JP2003279808 A JP 2003279808A
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JP
Japan
Prior art keywords
light
optical fiber
optical
wavelength
ferrule
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002083791A
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Japanese (ja)
Inventor
Koji Oura
Hitomaro Togo
Hiroo Uchiyama
博夫 内山
浩二 大浦
仁麿 東郷
Original Assignee
Matsushita Electric Ind Co Ltd
松下電器産業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Ind Co Ltd, 松下電器産業株式会社 filed Critical Matsushita Electric Ind Co Ltd
Priority to JP2002083791A priority Critical patent/JP2003279808A/en
Publication of JP2003279808A publication Critical patent/JP2003279808A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable optical transmitting / receiving module at a low cost, which can be easily miniaturized, has a simple structure, is easy to adjust, is easy to assemble, and has high reliability. SOLUTION: An LD 21 of a light emitting section 2 has a first wavelength (λ).
The light having 1 ) is incident on the optical fiber 6 and
An optical transceiver module for transmitting light having the second wavelength (λ 2 ) from the optical fiber 6 to the PD 31 of the light receiving unit 3 and performing bidirectional optical transmission, wherein the distal end side of the optical fiber 6 is fixed. The ferrule 41 to be held is formed of glass or light transmitting resin, and the LD 21 of the ferrule 41 is
Alternatively, a wavelength multiplexing / demultiplexing device in which a front end surface facing the PD 31 is formed by an inclined surface inclined at a predetermined angle, and transmits light of the first wavelength (λ 1 ) and reflects light of the second wavelength (λ 2 ). The filter 42 was formed on a flat substrate and attached to the inclined surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transceiver module for transmitting and receiving light transmitted bidirectionally through an optical fiber.

[0002]

2. Description of the Related Art In an optical transmission system, when bidirectional transmission is performed using one optical fiber, transmission light emitted from a semiconductor laser (LD; Laser Diode) which is a light emitting means is transmitted to the optical fiber. It is necessary to couple the received light emitted from the optical fiber to the photo diode (PD) which is the light receiving means.
Regarding the optical coupling method, various methods have been proposed and developed so far.

As an example, for example, Japanese Patent Laid-Open No. 2000-1
The one described in Japanese Patent No. 80671 is known. This will be described with reference to FIG. 22. FIG. 22 is a block diagram showing the configuration of the optical transceiver module in the optical signal transmission system. This optical transceiver module 1
00, a wavelength multiplexing / demultiplexing coupler 103 attached to the inside of the housing 100A in accordance with the optical axis of the optical fiber 101 at the front end surface of a ferrule 102 containing the optical fiber 101, as shown in FIG. LD 104 and P arranged at appropriate positions in the optical axis direction and in the direction perpendicular to the optical axis, respectively.
And D105.

Of these, the wavelength multiplexing / demultiplexing coupler 103 allows light of the first wavelength λ 1 (hereinafter referred to as transmission light (λ 1 )) to pass in the optical axis direction, while transmitting light of the second wavelength λ 2 . Light (hereinafter, referred to as received light (λ 2 )) is reflected in a direction perpendicular to the optical axis, and is formed by using a pair of same-angled right-angle prisms in which slopes are joined to each other. In addition, the wavelength multiplexing / demultiplexing coupler 103 is coated at its joint surface with a wavelength multiplexing / demultiplexing film 108 using a dielectric multilayer film. On the other hand, the wavelength multiplexing / demultiplexing coupler 103, the LD 104, and the PD
An imaging lens 10 is provided on each optical axis between
6, 107 are arranged.

In the optical transmission / reception module having such a configuration, the transmission light (λ 1 ) from the LD 104 passes through the wavelength multiplexing / demultiplexing coupler 103 as it is in the optical axis direction and the optical fiber 1
Sent to 01. On the other hand, the received light (λ 2 ) from the optical fiber 101 is reflected by the wavelength multiplexing / demultiplexing coupler 103 in the direction perpendicular to the optical axis and received by the PD 105.

[0006]

The wavelength multiplexing / demultiplexing coupler 103 having such a structure uses two right-angle prisms of the same shape, and one of them is inverted by 180 degrees so that the slopes are opposed to each other. Since they are formed by bonding with an adhesive, there is a problem that light absorption loss (about 2 to 3%) is caused by the adhesive.

Further, in such a conventional optical transmission / reception module, a certain accuracy is required for the outer dimensions and surface smoothness of the right-angled prism, so that there is a problem that it becomes expensive accordingly. Also, the reflected light (received light (λ 2 )) reflected by the prism type wavelength multiplexing / demultiplexing coupler 103.
Is a prism portion of the wavelength multiplexing / demultiplexing coupler 103 and an air layer ,
This is a light source that causes return light (return from the prism side (not shown) to the ferrule side) to cause Fresnel reflection at the interface with this return and the backward light travels backward to transmit the light of the second wavelength λ 2. It is incident on an LD (not shown) and causes its oscillation spectrum to fluctuate or cause optical output fluctuation.
Was causing the problem. Further, the light (λ 2 ) received from the optical fiber 101 is reflected at the adhesive surface 102B between the ferrule and the right-angled prism, which causes fluctuations in the optical output of the LD (not shown), and the return light is at the adhesive surface 102B. After being reflected again, it is reflected by the wavelength multiplexing / demultiplexing coupler 103 to become received light, and since the multiple reflected light enters the PD 105, there is a problem that the reception characteristics are deteriorated.

Further, the prism type wavelength multiplexing / demultiplexing coupler 1
When the 03 and the ferrule 102 are bonded, the mutual positional relationship is important. That is, in the conventional optical transceiver module, the wavelength multiplexing / demultiplexing coupler 103 is attached to the tip of the ferrule 102 so that the optical axis of the optical fiber 101 and the vapor deposition surface of the wavelength multiplexing / demultiplexing film 108 form a predetermined angle. There was a need. As a result, if the positional accuracy between the vapor deposition surface of the wavelength division multiplexing / demultiplexing film 108 in the prism and the optical fiber 101 is poor, the function of the optical transceiver module may be impaired. Under such circumstances, the end face of the ferrule 102 in which the optical fiber 101 is embedded is not
At the same time, it was necessary to perform a plane polishing at a right angle.

Further, in the optical transmission / reception module having such a configuration, the ferrule 102 is arranged on the outer peripheral surface in the vicinity of the tip end so as to be parallel to the optical axis direction of the optical fiber 101 (Z-axis direction in FIG. 22). Notch face 102 in the direction
A is provided, and the relative position between the vapor deposition surface of the wavelength multiplexing / demultiplexing film 108 in the prism of the wavelength multiplexing / demultiplexing coupler 103 and the PD 105 is also adjusted by utilizing this cutout surface 102A. Therefore, at the same time that the optical axis of the optical fiber 101 and the vapor deposition surface of the wavelength multiplexing / demultiplexing film 108 satisfy a predetermined positional relationship, at the same time, the notch surface 102A provided on the ferrule 102 and the wavelength multiplexing / demultiplexing coupler 103 are vapor deposited. It is necessary to bond the above-mentioned prism type wavelength multiplexing / demultiplexing coupler 103 to the front end surface 102B of the ferrule 102 so that the surface and the surface satisfy a predetermined positional relationship, and there is a problem that the adjustment work is troublesome.

Therefore, the present invention has been made to solve the conventional problems, and it is easy to reduce the size and
It is an object of the present invention to provide an optical transmitter / receiver module, which has a simple structure, facilitates adjustment work, is easy to assemble, and is highly reliable, at low cost.

[0011]

In order to solve the above-mentioned problems, the optical transmitter-receiver module of the present invention comprises a light-emitting means, a first means.
Light having a wavelength of is incident on the optical fiber,
A light transmitting / receiving module for performing bidirectional light transmission by inputting light having a second wavelength from the optical fiber to a light receiving means, wherein a ferrule for fixing / holding a tip end side of the optical fiber is made of glass or light. Made of a flexible resin,
An inclined surface inclined at a predetermined angle with respect to the central axis of the optical fiber is formed at the tip of the ferrule facing the light emitting means or the light receiving means, and the light of the first wavelength is allowed to pass through the second wavelength. The wavelength multiplexing / demultiplexing filter for reflecting the light is formed on a flat substrate and attached to the inclined surface.

Therefore, according to the optical transmitter / receiver module of the present invention, the wavelength multiplexing / demultiplexing filter used in the optical transmitter / receiver module can be formed, for example, by coating a glass substrate with a dielectric multilayer film. Excellent and inexpensive. Further, since the optical fiber and the wavelength multiplexing / demultiplexing filter are both held and fixed by the glass or light-transmitting resin ferrule having an inclined surface, the accuracy of the inclination angle of the wavelength multiplexing / demultiplexing filter with respect to the optical axis of the optical fiber is high. It is possible to set the wavelength, it is possible to obtain a good wavelength multiplexing / demultiplexing characteristic, and it is easy to assemble.

In the optical transceiver module of the present invention, the tip of the optical fiber has an inclined surface inclined at a predetermined angle with respect to the central axis of the optical fiber, and the inclined surface of the optical fiber and the ferrule are provided. It is characterized in that an air layer is interposed between the wavelength multiplexing / demultiplexing filter attached to the inclined surface of the.

Therefore, according to the optical transceiver module of the present invention, the light of the second wavelength transmitted through the optical fiber is
Although reflected at the interface between the emission end face of the optical fiber and the air layer, it does not reverse the traveling optical path as reflected return light, and returns to a light source such as a semiconductor laser that transmits light of the second wavelength, It does not fluctuate the oscillation spectrum or cause fluctuations in light output. Further, since both surfaces of the wavelength multiplexing / demultiplexing filter are air layers, the transmitted light is refracted on both surfaces of the glass substrate on which the wavelength multiplexing / demultiplexing filter film is formed, but since the incident angle and the exit angle are the same, Since the transmitted light is parallel, the deviation of the optical axis is small.

Further, the optical transceiver module of the present invention is
The optical fiber and the light emitting means are arranged in a relative positional relationship such that the mounting surface of the light emitting means and the minor axis of the inclined surface of the optical fiber are parallel to each other.

Therefore, according to the optical transceiver module of the present invention, it is possible to obtain a stable optical coupling characteristic when the light emitted from the light emitting portion enters the core of the optical fiber.

Further, the optical transceiver module of the present invention is
The ferrule and the light emitting means are arranged in a relative positional relationship such that the mounting surface of the light emitting means and the axis on the inclined surface at the tip portion of the ferrule which is orthogonal to the inclination direction are parallel to each other. Is arranged.

Therefore, according to the optical transmitter-receiver module of the present invention, the variation in the incident angle of the light emitted from the light emitting means with respect to the inclined surface of the glass substrate coated with the wavelength multiplexing / demultiplexing filter film can be reduced. It is possible to obtain stable transmission characteristics in the wavelength range of.

Further, the optical transceiver module of the present invention is
The ferrule has a rod shape with a square cross section, and transmits only the light of the second wavelength to a side surface position of the square ferrule from which the light of the second wavelength reflected by the wavelength multiplexing / demultiplexing filter is emitted. It has a structure in which band filters that are used are bonded together.

Therefore, according to the optical transceiver module of the present invention, when the light of the first wavelength emitted from the LD as the light emitting means is scattered at the interface between the wavelength multiplexing / demultiplexing filter and the air layer or the end face of the optical fiber. Since the scattered light is blocked by the filter that transmits only the light of the second wavelength, the light of the first wavelength does not enter the PD which is the light receiving means, and therefore the reception characteristic does not deteriorate. Moreover, since a filter that transmits only the light of the second wavelength is attached to the side surface of the rectangular glass ferrule, the assembling property is excellent.

Further, the optical transceiver module of the present invention is
An image forming lens is arranged on each optical axis between the wavelength multiplexing / demultiplexing filter and the light emitting means and the light receiving means.

Therefore, according to the optical transceiver module of the present invention, the light of the first wavelength emitted from the light emitting portion having the light emitting means can be efficiently incident on the optical fiber and emitted from the optical fiber. The light of the second wavelength can be efficiently incident on the light receiving portion having the light receiving means. Further, by using the LD package and the PD package with the spherical lens as the light emitting part and the light receiving part, it becomes possible to obtain an optical transceiver module which is small in size, has a simple structure, and is excellent in assembling.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. [First Embodiment] FIG. 1 is a schematic configuration diagram showing an optical transceiver module 1A according to a first embodiment of the present invention. The optical transmission / reception module 1A of this embodiment basically includes an LD package 2 forming an optical transmission section, a PD package 3 forming an optical reception section, and an optical fiber forming an optical coupling section inside and outside the optical fiber 6. The assembly 4 and a metal casing 5 having a structure in which these are fixedly supported are provided.

Here, the LD package 2 is provided with an LD 21 for optical transmission and a PD 22 for monitoring for controlling LD optical output in a container 23 made of metal. The LD 21 according to the first embodiment has a wavelength λ 1 of 1.30 μm.
Is configured to emit infrared light. The container 23 is filled with nitrogen gas and the like, and the surface of the LD 21 on the optical axis is focused on the tip of the optical fiber 6 by the light emitted from the LD 21. A spherical lens 24 having an AR coat made of is provided. Further, terminals 25 for electric signals and for power supplies (including ground) are provided on the back surface of the LD package 2.

On the other hand, the PD package 3 has a structure in which a PD 31 for light reception and a preamplifier IC 32 for preamplifying the detection signal output of the PD 31 are housed in a metal container 33. . Further, on the surface of the container 33, received light sent from a base station (not shown) or the like (infrared light having a wavelength λ 2 of 1.55 μm in the first embodiment)
A spherical lens 34 made of BK7 or the like for condensing the light on the PD 31 is provided on the optical path of the received light. Further, terminals 35 for electric signals and for power supplies (including ground) are provided on the back surface of the PD package 3.

In the optical fiber 6, an optical fiber element wire 61, which is formed by adding an appropriate refractive index adjusting dopant to quartz glass, is covered with an appropriate plastic material.
Have. Further, the inside of the optical fiber element wire 61 is composed of a core and a clad, and the refractive index distribution thereof may be of any type such as step index (SI) type and great index (GI) type. is there. Although the optical fiber 6 is made of quartz glass, it may be made of synthetic resin.

Next, the structure of the optical fiber assembly 4 of the first embodiment will be described below. As shown in FIG. 1, the optical fiber assembly 4 generally includes a transparent glass ferrule 41 and a wavelength multiplexing / demultiplexing filter (hereinafter, WDM (Wavelength Division Module).
a tiplexing) filter 42, a holder 43,
And an optical fiber element wire 61.

Of these, the glass ferrule 41 is made of borosilicate glass or the like and has a perfect circular cross section, and an optical fiber element wire in which quartz glass is exposed in a through hole bored at the center thereof is exposed. 61 is buried. In addition, at the end of the glass ferrule 41, as shown in FIG.
As shown in (A), an inclined surface 41A having an elliptical cut shape is formed. That is, the end portion of the glass ferrule 41 is inclined (θ 1 = 45 °) by dicing or polishing as shown in FIG.
41A is formed, and WD is formed on this inclined surface 41A.
The M filter 42 is attached.

On the other hand, at the tip of the optical fiber element wire 61,
As shown in FIG. 2B, a dicing saw (dicer),
Optical fiber cutter ("FIBER OPTIC CLEAVER" in the United States)
Call. Angled C is a device for cutting at 8 degrees.
An inclined surface 61A is formed by performing a diagonal cut (or oblique polishing may be performed) such as with a leaver (York Co.), and the tip end of the inclined surface 61A reaches the inclined surface 41A of the glass ferrule 41. The glass ferrule 41 is positioned and disposed so as not to do so. Therefore, between the dielectric multilayer film surface (which is the inner side surface) of the WDM filter 42 bonded to the inclined surface 41A of the glass ferrule 41 and the inclined surface 61A which is the input / output end surface of the optical fiber element wire 61, The air layer AI is interposed. The distance L0 at the narrowest part of the air layer AI is preferably zero, but it is practically appropriate to be 0.2 mm or less because it is difficult to assemble.

Then, as shown in FIG. 3B, the optical fiber element wire 61 of this embodiment is positioned and fixed with the adhesive B in the above-mentioned state. For this reason, the adhesive B is made to flow into the glass ferrule 41 from the base end surface (the surface opposite to the inclined surface of the tip). However, when this flow is small, the optical fiber strand is fed from the outer peripheral surface of the glass ferrule 41. A notch 41C for injecting the adhesive B is formed at a depth reaching the central hole 41B in which 61 is inserted.

Further, it is desirable that the adhesive B for fixing the optical fiber element wire 61 in the glass ferrule 41 should not be present on the optical path of the received light (λ 2 ), but there is a risk that it will reach the optical path. In such a case, it is preferable to use an adhesive having a characteristic of transmitting the received light (λ 2 ) transmitted through the optical fiber element wire 61. Similarly, the tip inclined surface 61A of the optical fiber element wire 61 also has an elliptical cut, but the elliptical shapes which are the tip surfaces of both the optical fiber element wire 61 and the glass ferrule 41. The relative phase relationship will be described later.

The WDM filter 42 has, for example, a side of 1.5.
mm and a thickness of 0.5 mm, the dielectric multi-layered film 42B is laminated and formed in 40 to 60 layers on a glass substrate 42A having a rectangular parallelepiped shape, and the inclined surface of the glass ferrule 41. It is fixed with an adhesive A on 41A. That is, the WDM filter 42 of this embodiment is
The glass ferrule 41 is provided on the side where the dielectric multilayer film 42B is formed.
Of the WDM filter 42 and the inclined surface 41A, and the ultraviolet curable adhesive A is applied between the WDM filter 42 and the inclined surface 41A. It is fixed to.

Further, the WDM filter 42 has a transmission light (λ) on both sides of the glass substrate 42A (outer side) opposite to the inner side on which the dielectric multilayer film 42B is formed.
1 ) (= 1300 nm) is coated with an antireflection film 42C such as an AR coat to prevent reflection, and when the transmitted light (λ 1 ) enters the WDM filter 42, an external air layer and the WDM filter 42 It is designed to prevent Fresnel reflection from occurring at the interface with the light loss.

The WDM filter 4 of this embodiment is used.
2 is 1.260 on the terminal side (for example, the house side)
The transmission light (λ 1 ) having a wavelength of ˜1.360 μm is transmitted while the reception light (λ 2 ) having a wavelength of 1.490 to 1.610 μm is totally reflected.
On the other hand, the same WDM filter 4 is also provided on the base station side (not shown).
In contrast to the terminal side (house side), this base station side transmits transmission light having a wavelength of 1.490 to 1.610 μm and 1.260 to 1.36.
The configuration is such that received light having a wavelength of 0 μm is totally reflected. The WDM filter 42 of this embodiment is shown in FIG.
As shown in, the light having a wavelength of 1280 nm to 1340 nm has a transmittance of 93.3% or more,
It has a transmittance of 1% or less for light of nm to 1600 nm.

The holder 43 is for holding the glass ferrule 41 and the coating portion 62 of the optical fiber 6,
In this embodiment, it is formed in a cylindrical shape using a stainless material such as SUS304. And this holder 4
Similarly, 3 is inserted in a sleeve 44 made of a stainless material such as SUS304 having good weldability, and is welded to the housing 5 via this sleeve 44. On the other hand, the sleeve 44 has a large-diameter flange portion and a small-diameter main body portion, and is inserted in the sleeve 44 and a part of the small-diameter portion (for example, a portion indicated by 44A in FIG. 4B). The holder 43 and the holder 43 are integrally welded by laser welding (D1).

The operation of the optical transceiver module 1 configured as described above will be described with reference to FIG. First, the transmitted light (λ 1 ) which is the light emitted from the LD 21
(= 1300 nm) is condensed by the spherical lens 24, and WDM
The light passes through the filter 42 and enters the core portion of the optical fiber element wire 61. Here, the W bonded to the emission end surface of the optical fiber element wire 61 and the inclined surface 41A of the glass ferrule 41.
An air layer AI is interposed between the air filter and the DM filter 42.
Since both sides of the WDM filter 42 are air layers, the transmitted light (λ 1 ) is refracted on both sides of the glass substrate 42A on which the wavelength multiplexing / demultiplexing filter film is formed, but the incident angle and the exit angle are the same. , The transmitted light becomes parallel. Therefore, LD21
If the optical axis of the transmitted light (λ 1 ) emitted from the optical fiber is parallel to the central axis of the optical fiber element wire 61, it is vertically incident on the core portion of the optical fiber element wire 61 with some axis deviation. Will be done. The deviation of the optical axis becomes smaller as the glass substrate 42A becomes thinner.

On the other hand, the received light (λ 2 ) (= 1550 nm) emitted from the optical fiber 6 is totally reflected by the WDM filter 42 and is condensed by the spherical lens 34, so that P
It is incident on D31 (image formation). That is, the optical fiber strand 61
The received light (λ 2 ) from is reflected by the WDM filter 42 in the direction perpendicular to the optical axis of the optical fiber element wire 61, and passes through the transparent glass ferrule 41,
The light is emitted in the downward (-Y) direction from the side surface of the glass ferrule 41. Further, the emission end face of the optical fiber element wire 61 is, for example, an inclined surface of 8 degrees, and the received light λ 2 transmitted in the optical fiber 6 is the emission end surface 6 of the optical fiber element wire 61.
Although reflected at the interface between 1A and the air layer AI, the reflected light has a function of radiating to the outside of the core of the optical fiber element wire 61. For this reason, the received light returns to the LD 21 of the light source that transmits the received light λ 2 without traveling backward in the traveling path as the reflected return light, causing the oscillation spectrum to fluctuate, or causing optical output fluctuation, There is no such thing. The inclination angle of the emitting end face of the optical fiber element wire 61 is 8 degrees in this embodiment (θ 2 in FIG. 2B).
However, the angle is not particularly limited, and any angle having a similar function may be used.

Next, a method of assembling the optical transceiver module 1 according to the first embodiment will be described in detail with reference to FIG. 4, (A) is an exploded plan view of the optical transceiver module 1, (B) is a side sectional view,
(C) shows a rear view.

(1) First, the optical fiber assembly 4 of the optical transceiver module 1 is formed. That is, (a) first, the optical fiber strand 6 is attached to the glass ferrule 41.
1 is inserted and adhesively fixed by an adhesive B (see FIG. 3) described later. (B) Next, the WDM filter 42 is attached to the glass ferrule 41 using the adhesive A (see FIG. 2). (C) Then, the glass ferrule 41 is inserted into the holder 43 made of stainless steel, and as shown in FIG.

Here, the optical fiber element wire 6 when fixing the optical fiber element wire 61 in the glass ferrule 41 is used.
1. A method of applying the adhesive B for fixing will be described with reference to FIG. (A) -I The coating 62 on the tip portion of the optical fiber cord 6 is removed by a stripper, the optical fiber element wire 61 made exclusively of quartz glass is exposed, and then the optical fiber element wire is wiped with ethanol. Wipe off the foreign matter adhering to 61.

(A) -II Next, the optical fiber element wire 61 is inserted into the hole 41B at the center of the glass ferrule 41, and after this insertion, the adhesive B is applied to the hole on the base end side of the glass ferrule 41. To do. The adhesive B is made to flow through the optical fiber element wire 61 by the capillary phenomenon and is poured into the hole 41B of the glass ferrule 41. However, when the adhesive B does not flow to the vicinity of the tip of the optical fiber element wire 61 inserted in the glass ferrule 41, the dicing saw is applied to the outer peripheral surface of the glass ferrule 41 in the direction perpendicular to the optical axis. Hole 41
You may make the notch 41C to B and apply and insert the adhesive agent B from this notch 41C. As the adhesive B, for example, a thermosetting adhesive such as 353ND (trade name, Epotek) is used. Since the adhesive B used here is not colorless and transparent and does not transmit light, it is necessary to take care not to adhere to the optical path portion.

Here, as shown in FIG. 3 (B),
Tip surface 41A which is the light incident / emission end surface of the optical fiber element wire 61
In the above, it is necessary to prevent the adhesive agent B from adhering to the optical path of the received light λ 2 that is returned by the WDM filter 42 at a right angle to the optical axis of the optical fiber 6, as described above. If there is a possibility that the adhesive agent B may be present on the optical path, the glass ferrule 41 transmits ultraviolet rays. Therefore, an ultraviolet ray curable adhesive agent is used for this adhesive agent B. As described above, the adhesive B is applied by the methods (a) -I and (a) -II.

(2) Next, the LD package 2 is pressed into the housing 5. The LD package 2 may be fixed to the housing 5 with an adhesive without any problem.

(3) Then, the optical fiber assembly 4 is fixed to the housing 5 by welding. That is, (a) the holder 43 of the optical fiber assembly 4 is inserted into the sleeve 44. (B) Next, optical axis alignment (X, Y, Z axes) of the optical fiber assembly 4 and the LD package 2 is performed. (C) And the holder 43 of the optical fiber assembly 4
And the sleeve 44 are welded to fix the Z axis. That is, when the holder 43 is inserted into the sleeve 44,
Part of the outer peripheral surface of the small diameter portion of the sleeve 44 (see, for example, FIG.
(Y) (Yttrium Al)
uminum Garnet; Y 3 Al 5 O 12 ) laser is irradiated, and the sleeve 44 and the holder 43 are integrally fixed by penetration welding (D1) or the like.

(D) Next, the optical axes of the optical fiber assembly 4 and the LD package 2 are aligned again, and the X and Y axes are adjusted. (E) Finally, the housing 5 and the sleeve 44 are welded,
Fix the X and Y axes. That is, with the end surface of the large diameter portion (flange portion) of the sleeve 44 pressed against one surface of the housing 5 in a close contact state, a boundary between the large diameter portion of the sleeve 44 and the housing 5 is provided. A YAG laser is radiated along and the both are integrally fixed by fillet welding (D2).

(4) Next, the PD package 3 has the adhesive E.
It is fixed to the housing 26 by. That is, (a) the PD package 3 is attached to the recess 5A of the housing 5, and the adhesive E is injected and applied into the gap between the recess 5A and the PD package 3. (B) Next, the received light is emitted through the optical fiber assembly 4 to perform optical axis alignment (X, Y axes) of the PD package 3. (C) After that, the adhesive E is cured and the PD package 3
Is fixed to the housing 5.

(5) In this way, the optical transmission / reception module 1 is completed by fixing and supporting each member constituting the optical fiber assembly 4 to the casing 5 made of stainless steel such as SUS304.

Next, more specifically, (b) of (3) above.
To (d), the LD 21 and the optical fiber element wire 61 when the optical transceiver module 1 of this embodiment is assembled
An optical axis adjusting method for adjusting the relative position between the optical axes of and will be specifically described with reference to FIGS. 6 to 8. 6 and 8, α and β schematically show variations in the emission direction of the laser light. In addition,
As is well known, the LD 21 itself emits laser light straight along the active layer of the pn junction portion.
There is a variation in the emission direction for each LD package 2 due to the mounting accuracy when the D21 is mounted on the mounting surface 26A described later.

That is, as shown in FIG. 6, in the package 23 of the LD package 2, the LD (LD element) is
21 is mounted on an upper surface 26A (hereinafter referred to as a mounting surface) of a metal stem 26 via a subcarrier 27. At the time of mounting, the LD 21 is arranged by slightly rotating on the mounting surface 26A. There is fear. As a result, the laser beam emitted from the LD 21, that is, the optical axis L1 of the transmitted light (λ 1 ) is LD in the plane parallel to the mounting surface 26A (XZ plane).
As shown by an angle α with respect to the designed emission direction (Z direction) of 21, there is a possibility that there is a large variation. On the other hand, LD
When the (LD element) 21 is mounted on the mounting surface 26A by die bonding or the like, the lower surface of the LD 21 and the mounting surface 26A are pressed against each other, so that in the vertical plane (YZ plane) with respect to the mounting surface 26A, Wavelength λ emitted from LD21
The optical axis L1 of the laser light of 1 varies as indicated by an angle β with respect to the designed emission direction (Z) direction, but this variation amount (width) can be suppressed smaller than the variation angle α.

On the other hand, the WDM filter 42 in which the dielectric multilayer film 42B is coated on the glass substrate 42A is the first
When the light of wavelength λ 1 enters the WDM filter 42, the transmission characteristics change subtly due to variations in the incident angle.

An example of this is shown in FIG. FIG. 7 shows the relationship between the wavelength of the incident light and the light transmittance when the incident angle of the light incident on the WDM filter 42 changes. The WDM filter 42 transmits the transmitted light (λ 1 ) and
Since it is desirable that the light of the wavelength of the received light (λ 2 ) is not transmitted, the first wavelength λ 1 (= 1
It is preferable that the incident angle of the light of 300 nm) is 45 degrees with respect to the incident surface of the WDM filter 42. Also,
It is preferable that the variation of the incident angle is as small as possible.

Therefore, as shown in FIG. 8, the LD 21 is mounted on an extension of the optical path L1 of the optical fiber element wire 61 through which the light of the first wavelength λ 1 (= 1300 nm) passing through the WDM filter 42 travels. In addition, L equipped with LD21
The lead of the D package 20 determines the mounting direction by the ground terminal 2G, and the stem 2 on which the LD 21 is mounted.
6 of the mounting surface 26A, the glass ferrule 41 so that the elliptical minor axis when the inclined surface 41A at the tip of the glass ferrule 41 is viewed from the normal direction of the inclined surface 41A is parallel to the mounting surface 26A. And the relative position between the LD 21 and the LD 21 are roughly adjusted and arranged.

With the above structure, the LD
Since the variation of the incident angle when the transmission light (λ 1 ) emitted from 21 enters the glass substrate 42A coated with the wavelength multiplexing / demultiplexing filter film, a specific wavelength including the wavelength of the transmission light (λ 1 ) is reduced. Range (1280 nm-1340n
It is possible to obtain stable transmission characteristics in m).

Next, with reference to FIG. 9 to FIG. 11, an optical fiber assembly corresponding to the above (4) (b) in assembling the optical transceiver module 1A according to the first embodiment of the present invention. The method of aligning the optical axes of the LD 4 and the LD 21 and the PD 31 will be specifically described. In these figures, the housing 5 and each assembly to be described later can be precisely positioned with respect to each other by an appropriate gripping device or the like (not shown) that can be precisely moved along each axis of XYZ. Has become.

(I) Method of adjusting the rotation angle θ in the optical fiber assembly 4: Fine adjustment of the rotation angle θ around the Z axis in the optical fiber assembly 4 is performed by using a rotation angle adjusting device described later. 2 ) The infrared vidicon camera 72, which is sensitive to (= 1550 nm), can easily and precisely perform the measurement. That is, in this embodiment, the housing 5
The optical fiber assembly 4 is positioned and attached to the infrared vidicon camera 72 as a rotation angle adjusting device with the camera oriented in a direction (on the Y axis) perpendicular to the optical axis (Z axis) of the optical fiber assembly 4. And a laser beam (hereinafter, λ 2 ) having the same wavelength (λ 2 ) as the received light (λ 2 ) is placed in the optical fiber of the optical fiber assembly 4.
The LD light source 71 that emits 2 (L) is optically connected.

Therefore, according to this rotation angle adjusting device,
The laser light (λ 2 (L)) emitted from the LD light source 71 is
The light propagates through the optical fiber 6 and is totally reflected by the WDM filter 42 at the tip of the optical fiber assembly 4. Then, this laser light (λ 2 (L)) is emitted from the side surface of the glass ferrule 41 to the outside in the downward (−Y) direction, and then is incident and imaged on the infrared vidicon camera 72. Then, the light emitted from the optical fiber 6 (laser light λ 2 (L)) is displayed on the monitor 73 connected to the infrared vidicon camera 72.
The light spot image of is displayed.

For example, as shown in FIG. 9B, when the optical fiber assembly 4 is rotating around the Z axis, the emitted light (laser) from the optical fiber 6 imaged by the infrared vidicon camera 72. The light spot position of the light λ 2 (L) is displaced from the proper position which is a temporary reference. Therefore, in this case, it is necessary to finely adjust the rotation angle θ of the optical fiber assembly 4. Here, the proper position means the center 80 of the angle of view of the monitor 73. In the case of FIG. 9B, it can be seen that the image 81 at the light spot position is displaced in the X-axis direction with respect to the center 80 of the angle of view. Therefore, in this case, the image of the light spot position projected on the monitor 73 is returned to the proper position 80 by gradually rotating the optical fiber assembly 4 clockwise in FIG. 9C toward the paper surface. be able to. In this way, the fine adjustment of the rotation angle θ is completed.

Also, the position adjustment of the optical fiber assembly 4 in the optical axis direction (Z axis) can be performed easily and precisely by performing the same method using the rotation angle adjusting device. For example, when the optical fiber assembly 4 is moved back and forth in the Z-axis direction, the light emitted from the optical fiber 6 focused by the infrared vidicon camera 72 (laser light λ 2 (L))
Is observed as an image of a light spot moving in the Z-axis direction on the monitor 73. Therefore, in the same manner as the rotation angle adjusting method of the optical fiber assembly 4 described above, the optical axis direction of the optical fiber assembly 4 is set so that the image of the light spot projected on the monitor 73 comes to the proper position 80 on the monitor 73. Adjust the Z-axis position.

(II) Positioning method and fixing method of XYZ in each axial direction in the optical fiber assembly 4: Next, referring to FIG. 10, the XYZ of the optical fiber assembly 4 after the above-described rotation adjustment is completed. A positioning method and a fixing method in each axial direction will be specifically described. The positioning adjustment in each of the XYZ axis directions in the optical fiber assembly 4 is performed by optically connecting the optical power meter 75 to the optical fiber 6 at the rear end of the optical fiber assembly 4 via an appropriate optical fiber cord 60. L
This is performed by a positioning adjustment device having a configuration in which a current source 76 for driving the LD 21 is electrically connected to the D package 2. That is, using this positioning adjustment device, L
D21 is caused to emit light, and its transmitted light (λ 1 ) (= 1300n
The reception level of m) is monitored by the optical power meter 75, and the XYZ axial directions of the optical fiber assembly 4 are adjusted so that the optical reception power is relatively maximized.

When the positioning adjustment is completed in this way, as described above, the ferrule holder 43 and the sleeve 44 are welded and fixed by a YAG laser or the like. That is, three welding fiber heads (not shown) drawn out from the YAG laser welding machine are arranged at 120 ° intervals with respect to the cylinder periphery of the sleeve 44, and are directed toward the side surface of the sleeve 44 at the cylindrical portion thereof. Through welding (D1) with 44 is performed. At this time, since the welding position of the optical fiber assembly 4 may be slightly deviated due to the distortion caused by the welding, the XY axis directions of the optical fiber assembly 4 are again adjusted so that the optical reception power becomes relatively maximum again. Make adjustments. Then, after this adjustment, the welding fiber head is moved to the ridgeline of the casing 72 and the brim on the sleeve 73, and YAG laser is irradiated to perform fillet welding (D2).

(III) Method of Attaching PD Package 3: Next, a method of attaching the PD package 3 to the housing 5 will be described with reference to FIG. First, the PD package 3 is inserted into the recess (counterpart) 5A provided in the housing 5, and the ultraviolet curable adhesive E is applied to the recess 5A. Since the diameter of the recess 5A is larger than the diameter of the stem of the PD package 3, the PD package 3 can be moved in the XZ direction in the recess 5A.

Here, an XZ axis adjustment device is used to adjust the position in the XZ axis direction. This X
The Z-axis adjusting device includes an LD light source 77 connected to the optical fiber assembly 4 via an appropriate optical fiber cord 60,
A voltage source 7 for driving the PD, which is electrically connected to the PD package 3.
8 and an ammeter 7 for measuring the current flowing through the voltage source 78
9 and is configured to monitor the light reception output of the PD package 3. Here, monitoring the light reception output means that when light is incident on the PD 31 in the PD package 3, a photocurrent flows through the PD 31 according to the light intensity, and the photocurrent is monitored by the ammeter 79. is there. Therefore, the light of a certain constant intensity is transmitted to the PD 31
The position of the PD package 3 at which the largest photocurrent is generated and flows when it is incident on is the position when the most light is received by the PD 31, and this is the optimum position to be installed. .

As described above, by using this XZ axis adjusting device, the laser light of the wavelength λ 2 (= 1550 nm) is made incident on the optical fiber assembly 4 from the LD light source 77, and the laser light reflected by the WDM filter 42 is PD. The package 3 receives light. Then, the position adjustment of the PD package 3 in the XZ axis direction is performed so that the light reception output of the PD package 3 becomes maximum.

Next, after this adjustment, the applied ultraviolet curable adhesive E is irradiated with ultraviolet rays to be cured. The PD package 3 and the housing 5 may be fixed by welding with a YAG laser or the like. In this way, the optical transceiver module according to the first embodiment of the present invention is completed.

Example Next, a comparative experiment of optical output between the optical transceiver module 1A according to the first embodiment of the present invention and the comparative example will be described with reference to FIGS.
As shown in FIG. 12, when the signal light transmitted while totally reflecting the inside of the core 61B provided at the center of the optical fiber element wire 61 is refracted and emitted at the tip surface 61A, the emission direction of this signal light In accordance with the well-known Snell's law, the following expression sin θb = n · sin θa (1) where n: refractive index θa of core 61B; incident angle θb;

Therefore, using the equation (1), the refraction angle θb
Can be derived from the following equation θb = sin −1 [n · (sin θa)] (2). Here, the core 61
When the refractive index of B is 1.461 and the incident angle θa is the inclination angle θ2 of the tip surface 61A, for example, 8 degrees, the refraction angle θb is obtained by the equation (2). Therefore, the angle between the refracted ray and the optical axis L2 is obtained. θc can be calculated as 11.8 degrees. As a result, conversely, in order for the laser light emitted from the LD 21 to enter the central portion of the core 61B, the angle θc formed by the optical axis L2 is 1.
It turns out that it is better to arrange them so that the angle is 1.8 degrees.

Therefore, the relative relationship shown in FIG. 12, that is, the LD 21 and the optical fiber element wire 61 (referred to as the first comparative example) arranged as shown in FIG. 13A, and the same as shown in FIG. The first comparison in which the respective optical outputs of the present invention (first embodiment) arranged and the second comparative example arranged as shown in FIG. I tried an experiment. However, here, the invention of the present application (first embodiment) is obtained by rotating the optical fiber element wire 61 by 90 degrees in the first comparative example, and the second comparative example is
This corresponds to the optical fiber element wire 61 rotated 180 degrees in the first comparative example.

As a result, as is clear from the graph shown in FIG. 14, the first comparative example has the maximum light output value (shown in the figure), and the second comparative example has the minimum light output value. It was found to take out (shown in the figure). On the other hand, it was confirmed that the light output value (shown in the figure) in the middle of these comparative examples can be taken out by the device of the present invention. Therefore, when the long axis of the elliptical tip surface 61A of the optical fiber element wire 61 is arranged to be perpendicular to the mounting surface 26A of the LD 21 as in the present invention, that is, as shown in FIG. 13 (B), the optical fiber strand 61
It has been found that, when the two are arranged relative to each other, a maximum optical output cannot be obtained, but it is easy to obtain a stable optical transceiver module having almost the same optical output.

This finding will be described in detail below. LD2
1 theoretically corresponds to FIG. 13 as shown in FIG.
It is ideal because the optical output is maximum in the arrangement of (A), but in reality, the accuracy when attaching the LD 21 to the mounting surface 26A is as shown in FIGS. 15 (B) to (D). There are variations. That is, as shown in FIG. 15 (E), considering only the point of incidence on the optical fiber strand 61, the positional relationship as shown in FIG. 15 (E) -depending on the mounting accuracy (variation width α) of the LD 21. Will be installed in.

Here, FIG. 15E shows an ideal state, but this FIG. 15E is similar to the above-mentioned comparative experiment shown in FIG.
As shown in (E), the optical fiber element wire 61 is fixed,
When a comparative experiment was performed to measure the light output when the LD 21 was arranged as in, the graph of FIG. 17 was obtained.

Next, this comparative experiment will be described with reference to FIGS. That is, the graph on FIG. 17 shows the optical output in the case of the arrangement of FIG.
According to theory (similar to the first comparative example in the comparative experiment described above), the optical output is maximum. On the contrary, the graph on FIG. 17 shows the light output in the case of the arrangement of FIG. 15E, and the data shows the lowest light output (similar to the second comparative example in the above-mentioned comparative experiment). I found out.

Next, as shown in FIG.
While fixing the arrangements of the LDs 21 shown in (E) to (5), the optical fiber element wire 61 was rotated by 90 degrees. It has already been described that the light output in the case of the arrangement of FIG. 13B shows an intermediate value in the graph of FIG. 14 by the above-mentioned comparative experiment. As described above, the arrangement shown in FIG. 13B corresponds to the arrangement shown in FIG. 13A when the optical fiber element wire 61 is rotated by 90 degrees. On the other hand, LD21
In the arrangement in which the mounting angle is reversed, the peak value on the graph in FIG.

[0073] In addition, in FIG. 16, the LD 21 is indicated by a broken line.
The position shown is on the optical axis L2 of the optical fiber strand 61.
Therefore, the LD 21 is ideally mounted on this position. this
If the LD21 is installed at the reference position, the optical fiber
Even if the wire 61 is rotated, the value of the optical output becomes almost constant.
Therefore, the plot line of the data in FIG. 16 has a flatter shape.
Represented in the form. Here, the LD 21 is the LD package 2
Since it is built into the
It is important to know the mounting variation when mounting.
Structure is an obstacle and it is very difficult to make measurements.
However, it requires a lot of man-hours and causes a high cost. Servant
Placed in an ideal position that theoretically maximizes the light output
Then, even if the maximum value shown in the graph of FIG. 14 is expected,
Is LD21 placed at the ideal position for each product?
Circumstances where it is difficult to confirm whether or not it is attached
Therefore, the lowest value may be output as a result.
It Therefore, individual variations for all products
Suppresses and gives a constant output characteristic, in other words, the characteristic
Judging from the viewpoint of stable supply of uniform products,
If the light output value on or near the graph of 14 is appropriate
Will be said.

Under these circumstances, FIG. 13 (B) (;
θ = 90 degrees) or L as shown in or in FIG.
By arranging the mounting surface 26A of D21 and the minor axis of the inclined surface at the tip of the optical fiber element wire 61 to be substantially parallel to each other, it is possible to stably supply a product having a uniform light output. The mounting angle deviation between the LD 21 and the mounting surface 26A needs to be within about ± 1 °, but the accuracy of the LCD package 2, the accuracy of the optical fiber assembly 4,
The accuracy of the housing 5 and the like are determined by the optical fiber 6-pair LD package 2,
When indirectly evaluated in relation to the LD 21, a deviation α in the emission direction of the LD 21 (α in FIG. 15E, α in FIG. 16, FIG.
It is preferable that α) of 8 is contained within about ± 5 °.

Therefore, according to the first embodiment,
Since a prism type wavelength multiplexing / demultiplexing coupler having a structure in which two right-angle prisms are joined together as in the related art is not required, the cost can be reduced accordingly. Moreover, since the wavelength multiplexing / demultiplexing filter 42 is formed of the parallel flat substrate, it is not necessary to consider the arrangement directionality like a prism when assembling the optical transceiver module 1, in other words, high accuracy is required. Since there is no optical transmission / reception characteristics, the optical transmission / reception module 1 having small variations in optical transmission / reception characteristics and high reliability can be realized.

Further, according to the first embodiment,
Since it is not necessary to grind the tip surfaces of both the glass ferrule 41 and the optical fiber element wire 61 to the same surface, and only the glass ferrule 41 needs to be machined, it is possible to process the dicing cut at a low cost. The cost can be reduced accordingly. Moreover, since the prism does not need to be used and has a simple structure, it is possible to provide an optical transmitter-receiver module that is easy to miniaturize and is excellent in assembling, and it is possible to further reduce the cost because the prism is not used.

[Second Embodiment] Next, the second embodiment of the present invention will be described.
The embodiment will be described with reference to FIGS. 19 and 20. In this embodiment, the same parts as those in the first embodiment are designated by the same reference numerals to avoid redundant description. The optical transceiver module 1B according to the second embodiment is different from that according to the first embodiment in that the optical transmission / reception module 1B is provided on the optical path after being bent by the WDM filter 42 which is a part of the optical path of the received light (λ 2 ). The point is that a bandpass filter (bandpass filter) 8 is provided.

The bandpass filter 8 transmits only the received light (λ 2 ) (wavelength 1550 nm) transmitted from the base station side, and at the same time, other light, especially transmitted light (λ 2).
1 ) (wavelength around 1300 nm) is cut without transmitting.

Normally, when the transmission light (λ 1 ) emitted from the LD 21 passes through the WDM filter 42, the WDM filter 42 is a parallel plate, and both side surfaces thereof are air layers, that is, the same refraction. Because there is a medium of rate,
The incident ray of transmitted light (lambda 1) incident from the outer side to the WDM filter 42, and the output light beam of the transmitted light (lambda 1) emitted from the inner surface side is transmitted through the WDM filter 42, in parallel relation to each other is there.

Therefore, if the above-mentioned incident light beam enters the WDM filter 42 in a state of being parallel to the central axis of the optical fiber element wire 61, the outgoing light ray will also be parallel to the central axis of the optical fiber element wire 62, but its transmission If the light (λ 1 ) partially includes laser light (λ 3 , λ 4 , λ 5 ...) With slightly different wavelengths, the light (λ 1 ) is refracted / transmitted by the WDM filter 42 as shown in FIG. 17, for example. In doing so, it may be scattered from the center axis of the optical fiber element wire 61. As a result, the scattered laser light (λ 3 ) traveling in the PD 31 direction is blocked by the bandpass filter 8 provided on the traveling optical path even if the scattered laser light (λ 3 ) attempts to enter the PD 31. As a result, PD31
It is possible to prevent unwanted noise from entering the. In this way, a highly reliable optical transceiver module can be provided at low cost.

[Third Embodiment] Next, the third embodiment of the present invention will be described.
The embodiment will be described with reference to FIG.
In this embodiment, the same parts as those in the first and second embodiments are designated by the same reference numerals to avoid redundant description.
The optical transceiver module 1C of the third embodiment is
What is different from the embodiment is that the glass ferrule 45 is
This means that the cross section has a rectangular shape instead of a perfect circular shape.

The glass ferrule 45 is arranged such that the lower surface 45A, which is the bottom surface, is parallel to the mounting surface of the PD 31, and the substantially flat disk-shaped bandpass filter 8 is appropriately provided on the lower surface 45A. It is fixed with the adhesive F.

Therefore, even in this optical transceiver module, L
When a part of the laser light transmitted from D21 is refracted / transmitted by the WDM filter 42, scattered light is generated and a part of the laser light (λ 3 ) proceeds in the PD 31 direction, and P
Even if an attempt is made to enter D31, the laser light (λ 3 ) is blocked by the bandpass filter 8. Further, according to this embodiment, unlike the second embodiment, it is not necessary to purposely provide a part for mounting the bandpass filter 8 on a part of the housing 5, so that the cost is reduced accordingly. It is possible to provide a highly reliable optical transmission / reception module.

In the above description, an example in which the ferrule and the optical fiber are made of a glass material such as quartz has been described. However, in addition to this, for example, PMMA (polymethyl.
Even if it is formed of a transparent plastic resin material having a good light transmission property such as (meth-acrylate), the same operation can be performed. Further, in these embodiments, the infrared light having a wavelength (λ 1 ) of 1.30 μm (1300 nm) is used as the transmission light, and the wavelength (λ 2 ) is 1.55 μm (1550 n) as the reception light.
Although the infrared light of m) was used, it is not limited to this. For example, in the case of an optical fiber (POF) formed of a plastic resin material, visible light with a wavelength of about 0.650 μm (650 nm) may be used as a wavelength with a small transmission loss. Further, in these embodiments, the optical transmission / reception module has a configuration in which the optical fiber 6 is attached (pigtail type), but in addition to this, a configuration in which the plug of the optical connector is fitted (receptacle type) Good.

[0085]

As described above, according to the present invention, the ferrule for fixing and holding the tip end side of the optical fiber is made of glass or a light transmissive resin, and the ferrule facing the light emitting portion or the light receiving portion is formed. A wavelength multiplexing / demultiplexing filter is formed on the parallel flat substrate by forming an inclined surface inclined at a predetermined angle at the tip and transmitting light of a first wavelength and reflecting light of a second wavelength on the inclined surface. It is a fixed configuration.

That is, according to the present invention, since a prism type wavelength multiplexing / demultiplexing coupler having a structure in which two right-angle prisms are joined together as in the prior art is not required, the cost can be reduced accordingly. Moreover, according to the present invention, since the wavelength multiplexing / demultiplexing filter is formed of the flat substrate, it is not necessary to consider the arrangement directionality like a prism when assembling the optical transceiver module, in other words, it is high. Since accuracy is not required, it is possible to realize an optical transmission / reception module with small variations in optical transmission / reception characteristics and high reliability.

Further, according to the present invention, it is not necessary to polish the tip surfaces of both the ferrule and the optical fiber to be the same surface, and only the ferrule needs to be processed. Therefore, dicing cutting can be performed at low cost. It is possible, and the cost can be reduced accordingly. Moreover, according to the present invention, since it is not necessary to use a prism and has a simple structure, it is possible to provide an optical transceiver module that is easy to miniaturize and is excellent in assembling, and the cost is further reduced because a prism is not used. Is possible.

[Brief description of drawings]

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

FIG. 2 is a view showing a main part of an optical transmitter / receiver module according to a first embodiment of the present invention, in which (A) is a glass ferrule and a WDM forming a main part of the optical transmitter / receiver module.
FIG. 3 is a perspective view showing the filter, FIG. 3B is a side sectional view of the glass ferrule and the WDM filter, and FIG. 3C is a plan view of the glass ferrule.

FIG. 3A is a perspective view of a glass ferrule used in the optical transceiver module according to the first embodiment of the present invention,
(B) is a side sectional view of the glass ferrule.

FIG. 4 shows an optical transceiver module according to a first embodiment of the present invention, in which (A) is an exploded plan view of the same.
(B) is a side sectional view thereof, and (C) is a rear view thereof.

FIG. 5 is a graph showing a transmitted light characteristic of the WDM filter according to the first embodiment of the present invention.

FIG. 6 is a view showing a mounted state of an LD in the optical transceiver module according to the first embodiment of the present invention,
(A) is a perspective view thereof, (B) is a side view thereof viewed from the X direction, and (C) is a plan view thereof viewed from the Y direction.

FIG. 7 is a graph showing transmission characteristics of signal light that enters the WDM filter of the optical transceiver module according to the first embodiment of the present invention at various incident angles.

8A and 8B are views showing a coupled state of an LD and an optical fiber element wire in the optical transceiver module according to the first embodiment of the present invention, FIG. 8A being a plan view thereof, and FIG. 8B being a side view thereof. Is.

FIG. 9 is a view showing a relative positional relationship in the θ direction between a glass ferrule and a PD when the PD package is assembled in the optical transceiver module according to the first embodiment of the present invention. Explanatory drawing which shows the monitor image of the rotation angle adjustment apparatus of the (theta) direction used for it, (B) explanatory drawing which shows a state when the relative position of a glass ferrule and PD has shifted | deviated,
(C) is an explanatory view showing a state in which the relative position between the glass ferrule and the PD is properly adjusted.

FIG. 10 is an explanatory diagram showing a connection state of a position adjusting device used for position adjustment when assembling an LD package in the optical transceiver module according to the first embodiment of the present invention.

FIG. 11 is an X used when assembling the PD package in the optical transceiver module according to the first embodiment of the present invention.
It is explanatory drawing which shows the connection state of the position adjusting device about a Z-axis direction.

FIG. 12 is an optical path diagram showing a relative positional relationship between an optical fiber element wire and an LD in the optical transceiver module according to the first embodiment of the present invention.

13A and 13B are explanatory diagrams showing a relative positional relationship between an LD and an optical fiber element wire, FIG. 13A is a first comparative example, and FIG. 13B is an optical transceiver module according to the first embodiment of the present invention. ,
(C) shows a second comparative example.

FIG. 14 is a graph showing the results of a comparative experiment on optical output using the optical transceiver module according to the first embodiment of the present invention, Comparative Example 1 and Comparative Example 2.

FIG. 15A is an explanatory view showing an ideal arrangement of the optical transceiver module according to the first embodiment of the present invention, and FIG. 15B shows a state in which the LD is correctly attached to the mounting surface (mounting surface). Explanatory drawing which shows, (C) and (D) is explanatory drawing which shows the state when LD is displaced | shifted with respect to the mounting surface, and (E) shows the assembly state of the same figure (B)-(D). It is explanatory drawing which shows the relative arrangement | positioning with an optical fiber.

FIG. 16 shows an optical fiber element 90 in FIG.
It is explanatory drawing which shows the relative arrangement | positioning with each LD when rotating once.

FIG. 17 is a graph showing data obtained when a comparative experiment was performed in which an optical output value was obtained when the LD was arranged in each state of FIG.

FIG. 18 is a diagram showing a relative positional relationship of the coupling portion between the LD and the optical fiber element wire of the optical transceiver module according to the first embodiment of the present invention, (A) is a plan view, and (B) is a diagram. It is a side view.

19A and 19B show an optical transceiver module according to a second embodiment of the present invention, FIG. 19A is an exploded plan view of the optical transceiver module, and FIG. 19B is a side sectional view of the optical transceiver module.

FIG. 20 is an explanatory diagram showing an operation in a main part of the optical transceiver module according to the second embodiment shown in FIG.

FIG. 21 shows an optical transmitter / receiver module according to a third embodiment of the present invention, in which (A) is an enlarged perspective view of a glass ferrule or the like, which is a main part of the optical transmitter / receiver module;
(B) is an enlarged side sectional view of the glass ferrule and the like.

FIG. 22 is an explanatory diagram showing a conventional optical transceiver module.

[Explanation of symbols]

1A Optical transceiver module 1B Optical transceiver module 1C Optical transceiver module 2 LD package 21 LD (light emitting portion) 22 Monitor PD 23 Metal container 24 Ball lens 26 Stem 26A Mounting surface 27 Subcarrier 3 PD package 31 PD (light receiving portion) 32 Preamplifier IC 33 Metal Container 34 Ball Lens 35 Terminal 4 Optical Fiber Assembly 41 Glass Ferrule 41A Inclined Surface 41B Center Hole 41C Cut 42 Wavelength Multiplexing / Demultiplexing Filter (WDM Filter) 42A Glass Substrate 42B Dielectric Multilayer Film 42C Antireflection Film 43 holder 44 sleeve 45 glass ferrule (square type) 45A lower surface 5 housing 5A recessed portion (counterpart) 6 optical fiber 60 optical fiber cord 61 optical fiber bare wire 61A inclined surface 61B core 61C clad 62 coating 71 LD light 72 infrared vidicon camera 73 monitor 75 optical power meter 76 current source (for LD drive) 77 LD light source 78 voltage source (for PD drive) 79 ammeter 8 bandpass filter (bandpass filter) A, B, C, E, F Adhesive AI Air layer D1 Penetration welding D2 Fillet welding L1 Optical axis (transmission light) L2 Optical axis (reception light) α Variation in emission direction (XZ plane direction) β Variation in emission direction (YZ plane direction) δ 0 Suitable position θ 1 Inclination angle (ferrule tip surface) θ 2 Inclination angle (optical fiber element tip surface) λ 1 Transmit light (1.30 μm) λ 2 Receive light (1.55 μm) λ 3 to λ 5 Scattered light

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ninmaro Togo             3-1, Tsunashima-Higashi 4-chome, Kohoku-ku, Yokohama-shi, Kanagawa             Matsushita Communication Industry Co., Ltd. F-term (reference) 2H037 BA03 BA12 CA10 CA14 CA37                       DA02 DA06 DA15 DA18                 2H048 GA04 GA12 GA17 GA23 GA24                       GA62

Claims (6)

[Claims]
1. Light for bidirectional optical transmission, wherein light having a first wavelength is made incident into an optical fiber from a light emitting means and light having a second wavelength is made incident on a light receiving means from the optical fiber. A transmitting / receiving module, wherein a ferrule that fixes and holds the tip end side of the optical fiber is formed of glass or a light-transmitting resin, and the center axis of the optical fiber is attached to the tip of the ferrule facing the light emitting means or the light receiving means. A wavelength-division multiplexing / demultiplexing filter is formed on a flat substrate to form a slanted surface inclined at a predetermined angle with respect to, and to pass the light of the first wavelength and reflect the light of the second wavelength. An optical transceiver module characterized by being mounted on an inclined surface.
2. A tip end portion of the optical fiber has an inclined surface inclined at a predetermined angle with respect to a central axis of the optical fiber, and a wavelength adhered to the inclined surface of the optical fiber and the inclined surface of the ferrule. The optical transceiver module according to claim 1, wherein an air layer is interposed between the optical multiplexer / demultiplexer and the multiplexer / demultiplexer filter.
3. The optical fiber and the light emitting means are arranged in a relative positional relationship such that a mounting surface of the light emitting means and a minor axis of the inclined surface of the optical fiber are parallel to each other. The optical transceiver module according to claim 2.
4. A relative positional relationship in which a mounting surface of the light emitting means and an axis on the inclined surface at the tip of the ferrule which is orthogonal to the inclination direction are parallel to each other,
4. The optical transceiver module according to claim 1, wherein the ferrule and the light emitting means are arranged.
5. The ferrule has a rod shape with a rectangular cross section, and the second ferrule is provided at a side surface position of the rectangular ferrule from which the light of the second wavelength reflected by the wavelength multiplexing / demultiplexing filter is emitted.
5. The optical transceiver module according to claim 1, wherein a bandpass filter that transmits only the light of the wavelength is attached.
6. An image forming lens is arranged on each optical axis between the wavelength multiplexing / demultiplexing filter and the light emitting means and the light receiving means, respectively.
The optical transceiver module according to the item.
JP2002083791A 2002-03-25 2002-03-25 Optical transmission/reception module Pending JP2003279808A (en)

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US7125174B2 (en) 2004-01-15 2006-10-24 Tdk Corporation Optical module for bi-directional communication system
JP2007121987A (en) * 2005-09-28 2007-05-17 Kyocera Corp Optical transmission/reception module
JP2007286085A (en) * 2006-04-12 2007-11-01 Alps Electric Co Ltd Optical transmission/reception module
US7403716B2 (en) 2004-01-15 2008-07-22 Tdk Corporation Optical module for bi-directional communication system
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US7762730B2 (en) 2008-04-08 2010-07-27 Sumitomo Electric Industries, Ltd. Bi-directional optical module and a method for assembling the same
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US7125174B2 (en) 2004-01-15 2006-10-24 Tdk Corporation Optical module for bi-directional communication system
US7403716B2 (en) 2004-01-15 2008-07-22 Tdk Corporation Optical module for bi-directional communication system
JP2007121987A (en) * 2005-09-28 2007-05-17 Kyocera Corp Optical transmission/reception module
JP2007286085A (en) * 2006-04-12 2007-11-01 Alps Electric Co Ltd Optical transmission/reception module
JP2009151041A (en) * 2007-12-20 2009-07-09 Fujitsu Ltd Optical module and optical transmission/reception module
US7762730B2 (en) 2008-04-08 2010-07-27 Sumitomo Electric Industries, Ltd. Bi-directional optical module and a method for assembling the same
US8885992B2 (en) 2009-06-01 2014-11-11 Mitsubishi Electric Corporation Optical reception module and method of manufacturing optical reception module
WO2010140196A1 (en) * 2009-06-01 2010-12-09 三菱電機株式会社 Optical transmission/reception module and method for manufacturing optical transmission/reception module
WO2010140185A1 (en) * 2009-06-01 2010-12-09 三菱電機株式会社 Optical transmitting and receiving module and method for manufacturing optical transmitting and receiving module
WO2011126317A3 (en) * 2010-04-07 2011-12-08 한국전자통신연구원 Bidirectional optical transmission and receiving device
WO2011126317A2 (en) * 2010-04-07 2011-10-13 한국전자통신연구원 Bidirectional optical transmission and receiving device
US8992100B2 (en) 2010-04-07 2015-03-31 Electronics And Telecommunications Research Institute Bidirectional optical transmission and receiving device
CN102830469A (en) * 2012-08-21 2012-12-19 武汉电信器件有限公司 Single-fiber bidirectional device for CSFP (Compact Small Formfactor Pluggable) module
WO2014168040A1 (en) * 2013-04-10 2014-10-16 古河電気工業株式会社 Optical coupling structure

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