JPS5990968A - Light-emitting and receiving unified element - Google Patents

Abstract

PURPOSE:To obtain a small-sized low-cost bidirectional optical signal transmitting terminal section of one package capable of also constituting the signal transmission system of multi-loops by directly joining the end surface of an optical fiber with each opening section of an optical guide for emitting beams and an optical guide for receiving beams opened to the connecting port of the optical fiber of a square section. CONSTITUTION:With both optical guide plates 61, 62 of an optical guide plate 61 for emitting beams made of multicomponent glass or plastic with one or a plurality of the optical-fiber connecting ports 61a and the optical guide 61b for emitting beams and an optical guide plate 62 for receiving beams, which have the optical-fiber connecting ports 62a in the same number as the optical guide plate 61 and the optical guide 62b for receiving beams and the quality of material thereof is the same as the optical guide plate 61 for emitting beams, each optical-fiber connecting ports 61a, 62a is opposed mutually, and joined with adhesives to form an integral optical guide plate 60. The mutual optical leakage of the optical guide 61b for emitting beams and the optical guide 62b for receiving beams is prevented by adhesives. Accordingly, since the light- emitting and receiving unified element 80 is encased in a case 50 and fixed, it is safe to mechanical force to be exerted from the outside, and it is handled easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical transmission terminal unit used in measuring instruments, information transmitters, etc. that perform bidirectional signal transmission using a common optical fiber.

Next, a conventional bidirectional signal transmission terminal section using light will be explained with reference to the drawings.

Figure 1 is a configuration diagram of a conventional bidirectional optical signal transmission terminal section. ν in the figure, 11 is a light emitting element, 11a+11. a is its electrical terminal, 21 is a light receiving element, 21a; 21a is its electrical terminal, 12, 22, and 32 are optical fibers;
23 and 33 are rod lenses, and 40 is a half mirror. In this figure, the light from the light emitting element 11 is transmitted through an optical fiber]2° rod lens 13. The colored light is sent out to the optical fiber 32 through the half mirror 40 and the rod lens 33. bar 7mi 9
-40° condolens 23. The light is received by the light receiving element 21 via the optical fiber 22. That is, the optical fiber 32 is used for two-way optical transmission for transmitting and receiving light. Therefore, the terminal section shown in Figure M1 uses optical fibers more easily than when using a unidirectional terminal section configured to transmit and receive signals using two optical fibers, one for transmitting light and one for receiving light. Since the number of optical fibers can be reduced, the cost of installing optical fibers can be reduced. However, this terminal part is a single loop signal system for transmitting and receiving, and requires optical fibers 12, 22, rod lenses 13, 23° 33, and a half mirror 40, and therefore has a large number of parts and is expensive. It has disadvantages such as high attenuation and large space occupied by the terminal section. Conventionally, these disadvantages are particularly important to solve when constructing a multi-loop signal transmission system using multiple terminal sections as shown in Fig. 1. It was a serious problem.

The object of the present invention is to eliminate the above-mentioned drawbacks and to obtain a packaged bidirectional optical signal transmission terminal section that is small, inexpensive, and capable of configuring a multi-loop signal transmission system. , this purpose has a light transmitting light guide, a light receiving light guide, and one or more sets of optical fiber connection ports, and one end of the light transmitting light guide of each set and one end of the light receiving light guide of the same set. are opened to the same set of optical fiber connection ports, the other ends of the light transmitting light guides of each set are combined to form one light transmitting light guide, and the other ends of the light receiving light guides of each set are connected to each other to form one light transmitting light guide. an optical waveguide plate which is combined into a single light-receiving light guide, a light-emitting element joined to the combined light-transmitting light guide, and a light-receiving light which is combined into one light-receiving light guide. This is achieved by an integrated light emitting/receiving element consisting of a light receiving element joined to a guide.

Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 is a plan view of an embodiment of the integrated light emitting and receiving element according to the present invention, FIG. 3 is a side view of FIG. 2, and FIG. M4 is a plan view of the light transmitting optical waveguide plate 61 shown in FIG. 3. 5 is a side view of FIG. 4, FIG. 6 is an enlarged view of the main part S in FIG. FIG.

In each figure, the same parts as in FIG. 1 are given the same reference numerals.

In FIG. 2, reference numeral 60 denotes a leading waveguide plate made of multi-component glass or plastic, and a light emitting element 11 such as an LED is mounted at one end of the light transmitting light guide of the waveguide plate. A light-receiving element 21 such as a photodiode is bonded to one end of the light-receiving light guide, and the guiding waveguide plate 60, the light-emitting element, and the light-receiving element 21 are formed into a body to form a light-emitting/receiving integrated element 80. There is. 514-j Phase part of the case in which the integrated light emitting and receiving element 80 is housed and fixed, lla, 2
1a is an electrical terminal for the light emitting element 11 and the light receiving element 21 provided with a rough portion 511C, respectively; llb;

5llb is a lead that passes through the phase portion 51 and connects between the light emitting element 11 and the terminal 11a, and between the light receiving element 21 and the terminal 21a, and 70 is one or more optical signal No. 2 transmissions connected to the optical waveguide plate 60. This is a Hikari 7 Eyeper. The electrical terminals 11a, 21a are formed on the printed circuit board so that they can be mounted on the printed circuit board.

In FIG. 3, reference numeral 52 designates the lid of the phase portion 51, and the case 50 is formed by bonding the lid 52 to the phase portion 51 with an adhesive or the like. 61 is an optical waveguide plate for light transmission made of multi-component glass or plastic having one or more optical fiber connection ports 61a and a light transmission light guide 61b;
Reference numeral 62 denotes a light-receiving optical waveguide plate made of the same material as the light-transmitting optical waveguide plate 6 which has the same number of optical fiber connection ports 62a and light-receiving light guides 62b as in the light-transmitting optical waveguide plate 61; The optical waveguide plates 61 and 62 are joined together with an adhesive so that the respective optical fiber connection ports 61a and 62a face each other to form an integrated optical waveguide plate 60. The adhesive prevents light from leaking between the light transmitting light guide 61b and the light receiving light guide 62b. Therefore, in the case of Ren, since the integrated light emitting and receiving element 80 is housed and fixed in the case, it is safe from external mechanical forces and therefore easy to handle.

In FIGS. 4 to 6, reference numeral 61a denotes groove-shaped optical fiber connection ports with a V-shaped cross section provided at the end of the light transmitting leading waveguide plate 61, the number of which is the same as the number of loops in the bidirectional signal transmission system;
Reference numeral 61b is a channel-shaped light guide for light transmission, which has the same number as the optical fiber connection ports 61a, and is formed by introducing impurities on the same surface on which the optical fiber connection [161a] of the light transmission optical waveguide plate 61 is provided. . light guide axb ii
- the end is open to the optical fiber connection 1116]a,
On the other end, if there is only one light guide 61b, leave it as it is.
In the case of a plurality of pieces, the light emitting element 11 is connected to one end of the optical waveguide plate 61 with an opening 1'' in the end thereof, and the light emitting element 11 is bonded to this opening with an adhesive or the like. If there is only one light guide 61b, the light emitted from the nuclear light guide 6 remains unchanged.
1b, and if there are a plurality of light guides 61b, the light guide 61b branches and connects to the optical fiber connection port 61a.
emitted to.

Although not shown, the end of an optical fiber 70 for signal transmission shown in FIG. 2 is inserted into the V-shaped groove of the optical fiber connection port 61a, and the end of the optical fiber 70 and the opening of the light guide 61b are inserted. Since the parts are connected by adhesive bonding or fusion splicing, the light emitted to the optical fiber connection hole 61a is connected to the optical fiber / (-
It will be incident on 70.

As will be explained in detail later, the V-shaped groove of the optical fiber connection port 61a is for facilitating axis alignment between the light transmitting light guide 61b and the optical fiber /<-70 (not shown). Because of this V-shaped groove, the front eight light guides 61
1) Attenuation of light when it is emitted from the optical fiber and enters the optical fiber /<-70 is reduced.

In FIGS. 7 and 8, 62a and 62b are optical fiber connections 1] 61a provided on the light transmission optical waveguide plate 61.
+ An optical fiber connection port provided in the optical waveguide plate 62 for receiving light, which has the same structure as each of the optical guides 61b for transmitting light.

A light guide for receiving light, the light guide 621) has one end 75
The other end of the optical fiber connection port 62a is opened at the end of the leading waveguide plate 62, and the other end is opened at the end of the leading waveguide plate 62 if there is only one light guide 62b, or if there are multiple light guides, the connection is broken. The elements 21 are bonded together using an adhesive or the like. Therefore, the light emitted from the optical fiber for signal transmission (not shown) connected to the optical fiber (- connection port 62a) in the same manner as explained in FIGS. Original light receiving guide 62b in
The light then enters the light receiving element 21 through the linear light guide 62b.

In FIGS. 2 to 8, the light transmission optical waveguide plate 61
, the respective optical fiber connection ports 61a and 62a of the light-receiving optical waveguide plate 62 are arranged as shown in FIG. [Light having a rectangular cross section] An eyebar connection port is formed, and both the light transmitting light guide 61b and the light receiving light guide 62b are open in this part 1. The end of the optical fiber 70 for signal transmission is inserted into this connection port, and the end and the openings of the light transmitting light guide 61b and the light receiving light guide 62b are bonded or fused as described above. Since the optical fibers 70 and the light transmitting light guide 61b and the light receiving light guide 621) are easily aligned during the connection work, the optical fibers 70 and the light guides 61b, 62b and the optical fibers 70 can be easily aligned. It is possible to obtain a connection result with less optical attenuation between the two. Since the light emitting/receiving integrated device 80 according to the present invention has the configuration described above, the optical signal from the light emitting device 11 is transmitted to the optical waveguide plate 6.
0, all the numbers of optical fibers 70 connected to
A single light receiving element 21 can receive the optical signal sent by. Therefore, this integrated light emitting/receiving element 80 can form a multi-loop bidirectional optical signal transmission terminal section by configuring optical signals incident on the light receiving element 21 in time series for each of the seven optical eyers for signal transmission. This means that it can be configured easily.

Next, the effects of the present invention will be explained.

As explained above, the light emitting/receiving integrated device as a bidirectional optical transmission terminal according to the present invention has a light guide for transmitting light, a light guide for receiving light, and one or more sets of optical fiber connection ports. One end of the light transmitting light guide of each set and one end of the light receiving light guide of the same set are connected to the same set of optical fibers.
(-Open the connection port, connect the other ends of the light transmitting light guides of each set to form one light transmitting light guide, and connect the other ends of the light receiving light guides of each set to form one light guide. An optical waveguide plate serving as a light guide for light reception, a light emitting element bonded to the light guide for light transmission which has been combined into one, and a light receiving element bonded to the light guide for light reception which has been combined and become one. The optical waveguide plate 60 is configured as a leading waveguide plate 6 for light transmission]
As an overlapping structure of the optical waveguide plate 62 for receiving light and the light receiving optical waveguide plate 62, an optical fiber 70 for signal transmission is connected to a connection port having a rectangular cross section formed by the optical fiber connection ports 61a + 62a of each of the waveguide plates 61 and 62. A light transmitting light guide 61b and a light receiving light guide 6 are inserted, and the end face of the optical fiber 0 is opened to the optical fiber connection port having a rectangular cross section.
Since it is directly bonded to each opening 2b, the light emitting/receiving integrated element according to the present invention has the following effects.

(1) Photon eyepers 12, 22 shown in Fig. 1
, the rod lenses 13, 23, 33, and the half mirror 4o are combined into an optical waveguide plate 6o, and the number of parts is smaller than that of a conventional transmission terminal, so it is small and inexpensive.

(Light sending light guide 61b, light receiving light guide 621)
Each end face of each directly connects to the light emitting element unit 1. Photodetector 2↓
and the optical fiber 70, so the first
There is no light attenuation as seen in the rod lenses 13, 23, 30 and half mirror 40 in the figure, and high-quality optical signals can be transmitted and received.

(3) The light-emitting element 11 and the light-receiving element 21 are joined to the optical waveguide plate 60 and are integrated into one body. When actually using this element, the case is 5
This device is easy to handle since it is used by storing it in the container.

(4) If a multi-loop bidirectional optical transmission terminal section is required, the terminal section can be configured with a single light emitting/receiving integrated element, so the transmission/IM terminal section as shown in Fig. It is extremely cheap compared to preparing one set for each day.

(5) Since the multi-loop bidirectional optical transmission system can be constructed at low cost, it is advantageous when trying to improve the reliability of the signal transmission system by duplicating the signal transmission system.

(6) Since the optical waveguide plate 6o has a superimposed structure, the optical guides 61a and 62a are embedded inside the waveguide plate Go, and there is no fear that the optical path will be damaged by the outside, and the light emitting The reliability of the light receiving element has increased.

In the present invention, the optical waveguide plate 6o is replaced by a light transmitting optical waveguide plate 6u having a light transmitting light guide 6b and a light receiving light guide 62b.
Although the optical waveguide plate 62 for light reception has an optical waveguide plate 62 having a
Only one of 62! 1° and the light guide's
By joining the light emitting element 1 or the light receiving element 21 to one end of the bundle, a signal branching element or a signal coupling element for multiple optical transmission systems can be configured. By providing a lens shade, a multiple light emitting element can be constructed, and furthermore, the light emitting element of the signal branching element is replaced with a nine far f par for signal transmission,
If a light receiving element is connected to the optical fiber connection 1-1 of the element, the multiple light receiving element can be set at H'l/7!2C.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional bidirectional optical signal transmission terminal section;
3 is a side view of FIG. 2, FIG. 4 is a plan view of the light transmitting optical waveguide plate 61 shown in FIG. 3, and FIG. Figure 5 is a side view of Figure 4;
6 is an enlarged view of the main part S in FIG. 5, FIG. 7 is a plan view of the light receiving optical waveguide plate 62 shown in FIG. 3, and FIG. 8 is a side view of FIG. 1. In each figure, 11... light emitting element, 2"... light receiving element, 60... optical waveguide plate, 61... optical waveguide plate for light transmission, 61a... optical fiber connection port, 61b...・Light guide for light transmission, 62... Optical waveguide plate for light reception, 62a・
...Optical fiber connection port, 62b...Light guide for light reception, 80...Light emission and reception integrated element.

Claims (1)

[Scope of Claims] ■) A light guide for transmitting light, a light guide for receiving light, and an optical fiber connection port, and one end of the pre-delivery light guide and one end of the light guide for light reception are connected to the optical fiber. A light emitting/receiving device comprising: an optical waveguide plate having an opening; a light emitting element bonded to the other end of the pre-delivery light guide; and a light receiving element bonded to the other end of the light guide. Integrated element. 2. In the device according to claim 1, the optical waveguide plate is provided with a plurality of optical fiber connection ports, and the portion of the light transmitting light guide on the opposite side to the side joined to the light emitting element is branched. Each of the branched ends is inserted into each of the plurality of optical fiber connection ports, and the part of the light receiving light guide opposite to the side joined to the light receiving element is branched, and each of the branched ends is connected to the plurality of optical fiber connection ports. A light emitting/receiving integrated element characterized by having an opening at each fiber connection port. , 3) IR, rF In the device according to claim 1 or 2, the optical waveguide plate is a light transmitting optical waveguide plate having a light transmitting light guide and a light receiving light guide having a light receiving light guide. A light emitting/receiving integrated device characterized by being constructed by overlapping an optical waveguide plate. 4) In the device according to claim 3, the light emitting and receiving integrated device is characterized in that the optical fiber connection port is formed by a groove formed in each of the light transmitting optical waveguide plate and the light receiving optical waveguide plate. element.