JP2001324654A - Assembling method for bidirectional, optical communication device and bidirectional optical communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the assembling method of a bidirectional optical communication device capable of preventing the crosstalk of a near end reflected light to a received light at the time of performing a bidirectional communication by full-duplex with one optical fiber. SOLUTION: Transmitting lights emitted from a light emitting element 4 are converged with a transmission lens to be coupled with an optical fiber 2. At this time, the transmitted light quantity Ps of a transmitting light to be emitted from the optical fiber 2 and the reflected light quantity Pr of the transmitting light to be made incident on a light receiving element 5 by being reflected on the end face 2a of the fiber 2 are measured. The light emitting element 4 is positioningly adjusted based on the values of the transmitted light quantity Ps and the reflected light quantity Pr. The element 4 is, for example, adjusted at a position where the transmitted light quantity Ps is equal to or larger than a fixed value and, also, the reflected light quantity Pr becomes equal to or smaller than a fixed value. Thus, the crosstalk of the near end reflected light to the received light can be prevented at the time of performing the bidirectional optical communication by full-duplex.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional optical communication device capable of transmitting and receiving optical signals bidirectionally by full-duplex communication in which transmission and reception are simultaneously performed during communication, and more particularly to a plastic optical fiber or the like. Home communication, communication between electronic devices,
The present invention relates to a bidirectional optical communication device that can be used for a LAN (Local Area Network) or the like.

[0002]

2. Description of the Related Art With the development of the information society, network technology using optical fibers has been receiving attention. In particular, plastic optical fiber (POF) in recent years
With the lower loss and wider bandwidth of r), applications to home communication and communication between electronic devices have been progressing.

[0003] Conventionally, in an optical communication apparatus for transmitting and receiving signal light by full-duplex communication using a quartz optical fiber as a transmission medium, an optical communication apparatus using two optical fibers to separate transmission light and reception light, What separated light and reception light by wavelength was the mainstream.

However, with the development of a large-diameter POF, a full-duplex communication method has been proposed in which a single optical fiber is used to spatially separate transmission light and reception light at the same wavelength.

In such an optical communication device, transmission and reception of signal light are performed by the same optical fiber, so that a method of preventing interference between transmission light and reception light is important. The cause of the interference of the transmission light with the reception light is mainly the reflection light from the POF. Specifically, as an example of this, when the transmission light is reflected by the end face of the optical fiber when entering the optical fiber (hereinafter referred to as near-end reflection), the transmission light propagated through the optical fiber is emitted from the optical fiber. At the end of the optical fiber (hereinafter referred to as far-end reflection). In particular, in order to prevent near-end reflection, it is necessary to separate the received light and the reflected light of the transmitted light in a small space determined by the diameter of the optical fiber, which makes the structure of the bidirectional optical communication device complicated. In addition, it is necessary to improve the accuracy of position adjustment during assembly.

As a method of assembling a conventional bidirectional optical communication device, for example, a method disclosed in Japanese Patent Application Laid-Open No. H11-352363 is known. About this assembly method,
This will be described below with reference to FIG.

[0007] An optical transceiver 101 to be assembled;
The optical transmitting / receiving device 201 for reference is arranged via an optical fiber 301. Light emitting element 11 of optical transceiver 101
The transmission light emitted from 1 is transmitted to the reference optical transmitting / receiving device 201 through the optical fiber 301 via the half mirror 112 and the lens 113, and is received by the light receiving element 214 of the reference optical transmitting / receiving device 201. .

Similarly, the received light emitted from the light emitting element 211 of the optical transmission / reception apparatus 201 for reference is
The light is transmitted to the optical transmitting and receiving apparatus 101 to be assembled through the optical fiber 301 via the lens 12 and the lens 213, and is received by the light receiving element 114 of the optical transmitting and receiving apparatus 101 to be assembled.

The optical fiber 301 is fixed to a connector 115, and is movable with respect to the package 116 of the optical transceiver 101 to be assembled, which has the light emitting element 111 and the light receiving element 114. And
The connector 115 is fixed at a position where the received light received by the light receiving element 214 of the optical transmitting and receiving apparatus 201 for reference and the received light received by the light receiving element 114 of the optical transmitting and receiving apparatus 101 to be assembled are both maximum. By sending
It is possible to assemble the optical transmitting and receiving apparatus 101 having good receiving efficiency.

[0010]

However, in the system disclosed in Japanese Patent Application Laid-Open No. H11-352363, since the near-end reflection from the optical fiber 301 is not taken into consideration, when performing full-duplex communication, Transmitted light is optical fiber 3
There is a problem that interference due to reflected light at the end face of the optical fiber 301 when incident on the optical fiber 301 tends to increase.

In the two-way optical communication device disclosed in Japanese Patent Application Laid-Open No. H11-352363, the light emitting element 1
Since there is no position adjustment function between the optical fiber 11 and the light receiving element 114, it is difficult to improve both the efficiency of the transmission light and the efficiency of the reception light only by adjusting the position of the optical fiber 301 by the connector 115. In particular, the lens 113 of the light emitting element 111
Is greatly reflected on the incident position of the transmission light on the optical fiber 301, and therefore, it is necessary to dispose it accurately.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to perform near-end reflection light to reception light when performing bidirectional optical communication in a full-duplex system using a single optical fiber. An object of the present invention is to provide a method for assembling a two-way optical communication device capable of obtaining a two-way optical communication device capable of preventing interference and a two-way optical communication device.

[0013]

In order to solve the above-mentioned problems, a method for assembling a two-way optical communication device according to the present invention includes a light-emitting element for transmitting light to an optical fiber, and a light-receiving element emitted from the optical fiber. A light-receiving element for receiving light, and a holding member for holding the light-emitting element movably at least in a plane orthogonal to the optical axis direction of the optical fiber, and a bidirectional optical signal by one optical fiber. An assembling method of a two-way optical communication device for performing transmission and reception, wherein an emitted light amount of transmitted light emitted from the optical fiber, a reflected light amount of transmitted light reflected on an end face of the optical fiber and incident on the light receiving element, and Is measured, and the position of the holding member is adjusted and fixed based on the amount of outgoing light of the transmitted light from the optical fiber and the amount of reflected light of the transmitted light measured by the light receiving element.

[0014] According to the above method, the holding member is moved, and the holding member is moved based on the amount of transmitted light emitted from the optical fiber and the amount of reflected transmission light measured by the light receiving element. By performing the position adjustment, it is possible to adjust the position of the transmission optical system (light emitting element) requiring high-accuracy position adjustment (alignment) by active alignment, and to perform the position adjustment with the transmission optical system (light emitting element) and the optical fiber. Alternatively, position adjustment with the transmission optical system (light receiving element) becomes possible. Therefore, it is possible to obtain a high-performance, high-yield bidirectional optical communication device. By measuring (monitoring) the amount of transmitted light and the amount of reflected light and performing the above assembly, full-duplex communication, that is, an S / S signal suitable for bidirectional transmission / reception of optical signals over a single optical fiber. The N value can be obtained, and interference of transmission light with reception light, that is, interference of near-end reflection light with reception light, can be reliably prevented. Further, both the reception efficiency of the reception light and the transmission efficiency of the transmission light can be improved. Therefore, it is possible to provide a method for assembling a two-way optical communication device capable of obtaining a high-performance, high-yield two-way optical communication device.

In order to solve the above-mentioned problems, a method for assembling a two-way optical communication apparatus according to the present invention includes a light-emitting element for transmitting transmission light to an optical fiber and a light-receiving element for receiving reception light emitted from the optical fiber. A method for assembling a bidirectional optical communication device that bidirectionally transmits and receives an optical signal by using a single optical fiber, comprising: an emission light amount of transmission light emitted from the optical fiber; Measure the reflected light amount of the transmitted light reflected and incident on the light receiving element,
The position of the light emitting element is adjusted and fixed at a position where the amount of emitted light is equal to or more than a certain value and the amount of reflected light is equal to or less than a certain value.

According to the above method, the position of the light emitting element is adjusted and fixed at a position where the amount of emitted light is equal to or more than a certain value and the amount of reflected light is equal to or less than a certain value. With this optical fiber, it is possible to obtain an S / N value suitable for transmitting and receiving an optical signal in both directions, and to reliably prevent transmission light from interfering with received light. In addition, by adjusting the position of the light emitting element based on the amount of emitted light and the amount of reflected light, the position of the light emitting element requiring high-accuracy position adjustment (alignment) can be adjusted by active alignment, and The position of the light emitting element and the optical fiber or the light receiving element can be adjusted. Further, both the reception efficiency of the reception light and the transmission efficiency of the transmission light can be improved. Therefore, it is possible to provide a method for assembling a two-way optical communication device capable of obtaining a high-performance, high-yield two-way optical communication device.

In order to solve the above-mentioned problems, in the method for assembling a two-way optical communication device according to the present invention, the position of the light-emitting element is adjusted by changing the position of the light-emitting element to a position at which the amount of emitted light is equal to or more than a predetermined value. After the coarse adjustment is performed, fine adjustment is performed at a position where the amount of reflected light is equal to or less than a predetermined value.

According to the above method, since the position of the light emitting element is roughly adjusted in advance by the amount of transmitted light, fine adjustment can be performed within a range where the transmitted light always enters the optical fiber.

In order to solve the above-mentioned problems, a method for assembling a two-way optical communication device according to the present invention includes a light-emitting element for transmitting transmission light to an optical fiber and a light-receiving element for receiving reception light emitted from the optical fiber. A method for assembling a bidirectional optical communication device that bidirectionally transmits and receives an optical signal by using a single optical fiber, comprising: an emission light amount of transmission light emitted from the optical fiber; Measure the reflected light amount of the transmitted light reflected and incident on the light receiving element,
The position of the light emitting element is adjusted and fixed at a position where the difference between the emitted light amount and the reflected light amount is equal to or more than a certain value.

According to the above method, the position of the light emitting element is adjusted and fixed to a position where the difference between the amount of emitted light and the amount of reflected light is equal to or greater than a certain value, so that a single optical fiber can be used for bidirectional transmission. S / N suitable for transmitting and receiving optical signals
The value can be obtained, and interference of transmission light with reception light can be reliably prevented. In addition, by adjusting the position of the light emitting element based on the amount of emitted light and the amount of reflected light, the position of the light emitting element requiring high-accuracy position adjustment (alignment) can be adjusted by active alignment, and The position of the light emitting element and the optical fiber or the light receiving element can be adjusted. Further, both the reception efficiency of the reception light and the transmission efficiency of the transmission light can be improved. Therefore, it is possible to provide a method for assembling a two-way optical communication device capable of obtaining a high-performance, high-yield two-way optical communication device.

In this case, the position of the light emitting element is adjusted to a position where the difference between the emitted light amount and the reflected light amount is maximum, and is fixed, so that the position where the S / N value is maximum, that is, The light emitting element can be adjusted (positioned) to a position where the S / N value becomes the best for transmitting and receiving an optical signal in two directions by the optical fiber.

In order to solve the above-mentioned problems, the method for assembling a two-way optical communication device according to the present invention is characterized in that the position of the light emitting element is adjusted in a plane orthogonal to the optical axis direction of the optical fiber. And

The displacement of the light emitting element on a plane perpendicular to the optical axis direction of the optical fiber is a displacement of the incident position on the optical fiber. If the incident position shifts, the reflection direction also changes, so that interference is likely to occur. For this reason, it is necessary for the light emitting element to perform position adjustment on a plane orthogonal to the optical axis direction of the optical fiber with higher precision than position adjustment in the optical axis direction of the optical fiber. However, as the number of positioning axes increases, the assembling time increases.

Therefore, according to the above method, the position of the light emitting element is adjusted in a plane orthogonal to the optical axis direction of the optical fiber, so that the position of the optical fiber that requires high precision position adjustment is adjusted. By performing only the position adjustment on the plane orthogonal to the optical axis direction by the active alignment based on the above-described assembling method, the bidirectional optical communication device can be assembled in a shorter time.

In order to solve the above-mentioned problems, a method for assembling a two-way optical communication apparatus according to the present invention includes a light-emitting element for transmitting transmission light to an optical fiber and a light-receiving element for receiving reception light emitted from the optical fiber. A method for assembling a plurality of bidirectional optical communication devices for transmitting and receiving optical signals bidirectionally through a single optical fiber, comprising: The two-way optical communication device assembled by the above-described method for assembling a two-way optical communication device according to the present invention is arranged, and the two-way optical communication device to be assembled is arranged at the other end. The bidirectional optical communication device assembled by the method of the above is used as a reference bidirectional optical communication device, and the optical signal is transmitted and received bidirectionally through the optical fiber, and the light emitting element and the light receiving element of the bidirectional optical communication device to be assembled are received. Elementary It is characterized by adjusting the position of the.

According to the above method, the operation of the two-way optical communication device assembled by the above-described method of assembling the two-way optical communication device according to the present invention is confirmed, that is, the two-way optical communication device is assembled by the above-described method of assembling the two-way optical communication device. The operation check of the light emitting element and the light receiving element of the bidirectional optical communication device can be performed at the time of assembling the bidirectional optical communication device to be assembled.
Since it is not necessary to separately check the operation, it is possible to assemble the bidirectional optical communication device with higher efficiency.

In order to solve the above-mentioned problems, a two-way optical communication device according to the present invention includes a light-emitting element for transmitting transmission light to an optical fiber, and a light-receiving element for receiving reception light emitted from the optical fiber. In a two-way optical communication device for transmitting and receiving an optical signal in two directions using one optical fiber, the light receiving element functions as a reflected light measuring unit that measures the amount of reflected light of transmitted light from the end face of the optical fiber. A holding member for holding the light emitting element movably at least in a plane orthogonal to the optical axis direction of the optical fiber, the holding member comprising: a light emitting amount of transmission light from the optical fiber; and a light receiving element. The position is adjusted and fixed based on the reflected light amount of the transmission light measured by the above method.

According to the above arrangement, the position of the holding member is adjusted based on the amount of outgoing light of the transmitted light from the optical fiber and the amount of reflected light of the transmitted light measured by the light receiving element. It has an S / N value suitable for bidirectional transmission and reception of optical signals through a single optical fiber, and can prevent interference of near-end reflected light with received light, thereby improving reception efficiency of received light. It is possible to provide a high-performance, high-yield bidirectional optical communication device that can improve both the transmission efficiency and the transmission efficiency of transmission light.

According to another aspect of the present invention, there is provided a bidirectional optical communication device comprising: a receiving stem for supplying an operating bias to the light receiving element; and a transmitting stem for supplying an operating bias to the light emitting element. The receiving stem and the transmitting stem are electrically separated.

According to the above configuration, since the receiving stem and the transmitting stem are electrically separated, it is possible to suppress a decrease in the S / N value due to electrical noise. In addition, since the operation check of the light emitting element and the operation check of the light receiving element can be performed separately, if either of them is defective, it can be dealt with only by replacing one of them. Further, according to the above configuration, the light emitting element and the light receiving element can be operated separately, and by providing the holding member as described above, the light emitting element and the light receiving element are separately moved for each stem. It becomes possible. Therefore, since the light emitting element and the light receiving element can be separately adjusted in position and fixed, both the reception efficiency of the reception light and the transmission efficiency of the transmission light can be improved. A two-way optical communication device can be provided.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] An embodiment according to the present invention will be described with reference to FIGS.
It is as follows. FIG. 2 is a schematic diagram showing the configuration of the bidirectional optical communication link. The bidirectional optical communication link 3 is a modulated light (signal light) suitable for transmission based on a data signal to be transmitted.
And a pair of optical fibers 2 that are connected to both ends of the optical fiber 2 so as to be optically coupled to each other and that transmit optical signals bidirectionally through the optical fiber 2. And a two-way optical communication device 1.

As the optical fiber 2, for example, PO
A multimode optical fiber such as F (plastic optical fiber) is preferably used. In POF, the core is PMMA (pol
It is made of a plastic having excellent light transmittance, such as y-methyl methacrylate) or polycarbonate, and the clad is made of a plastic having a lower refractive index than the core.

In such an optical fiber 2, since the diameter of the core can be easily increased from about 200 μm to about 1 mm as compared with the quartz optical fiber, the coupling adjustment with the bidirectional optical communication device 1 is easy. Yes, an inexpensive bidirectional optical communication link 3 can be obtained.

Further, as the optical fiber 2, a plastic clad optical fiber (PCF) having a core made of quartz glass and a clad made of a polymer may be used.
PCF is more expensive than POF, but is characterized by small transmission loss and a wide transmission band. Therefore, P
By using CF as a transmission medium, it is possible to obtain a bidirectional optical communication link 3 that can perform long-distance communication or higher-speed communication.

FIG. 1 is a sectional view showing a schematic configuration of a two-way optical communication device according to the present embodiment. FIG.
3A to 3D are views showing a method of assembling the bidirectional optical communication device, and FIG. 3A shows a configuration of a receiving unit in the bidirectional optical communication device, and FIG. () Shows a configuration in which the receiving unit is attached to a receptacle. FIG. 3C shows a configuration of a transmitting unit in the bidirectional optical communication device. FIG. 3D shows a configuration in which the transmitting unit is attached to a receiving unit 21 attached to the receptacle 14. Is shown.

As shown in FIGS. 1 and 3 (d), the bidirectional optical communication apparatus 1 fixes the optical fiber 2 to the receiving section 21 and the transmitting section 22 for the optical signal and the optical fiber 2 by the plug 13. A receptacle 14 for holding the fiber 2 and the plug 13 is provided. The receiving unit 21 is fixed to the receptacle 14, and the transmitting unit 22 is attached to a receiving unit 21 attached to the receptacle 14. are doing.

The above-mentioned receiving unit 21 is provided in FIG. 1 and FIG.
As shown in (1), a light receiving element 5 for receiving (receiving) modulated light emitted from the optical fiber 2 as a reception light 17 to generate a data signal, and a transmission lens 6 (transmission optical member) on one end surface are provided. At the same time, the light receiving element 5
And a receiving stem 9 having a receiving pin 19 and supplying an operating bias to the light receiving element 5 via the receiving pin 19.

As the light receiving element 5, it is desirable to use a photodiode which converts the intensity of the received modulated light into an electric signal and has high sensitivity in the wavelength region of the light emitting element 4 described later. As the light receiving element 5, for example, a PIN (positive intrinsic negative) photodiode made of silicon, an avalanche photodiode, or the like can be used.

The condenser mirror 7 is, for example, a PMMA (p
It is made of plastic such as oly-methyl methacrylate) or polycarbonate by injection molding. A reflection film 11 made of aluminum, gold, or the like is formed on the concave surface portion. The reflection film 11 is disposed so as to face the optical fiber 2, and reflects the received light 17 emitted from the optical fiber 2. The light is focused on the light receiving element 5.

An opening 12 (portion without a reflective film) through which transmission light passes is formed in a part of the reflective film 11 of the condenser mirror 7. The opening 12 is formed parallel to the end face of the optical fiber 2.

The transmission lens 6 is a lens formed on a part of the condenser mirror 7, and transmits the transmission light 1 from the light emitting element 4.
6 is converted into an NA (numerical aperture) and coupled to the optical fiber 2. The transmission lens 6 is formed on an extension of the opening 12 on the surface of the condensing mirror 7 facing the reflection film 11, and a transmission unit 22 is attached to the reception unit 21 as shown in FIG. Sometimes, it is arranged near the light emitting element 4. The surface of the condenser mirror 7 on which the transmission lens 6 is formed is used as a cover 10 for protecting the light emitting element 4.

Further, the transmission unit 22 is provided in the communication system shown in FIGS.
As shown in (c), a light emitting element 4 that mainly generates modulated light based on a data signal and makes the modulated light incident on the optical fiber 2 as transmission light 16, and is provided behind the light emitting element 4. A monitoring photodiode 23 for keeping the light amount of the light emitting element 4 constant, a transmitting pin 18, and a transmitting stem 8 for supplying an operating bias or a signal modulation bias to the light emitting element 4 via the transmitting pin 18; A holding member 15 provided so as to be capable of adjusting the position with respect to the receptacle 14 and adjusting the position of the light emitting element 4 with respect to the optical fiber 2 or the light receiving element 5 and fixing the same.
(Light emitting element holding unit).

As the light emitting element 4, a semiconductor laser or a light emitting diode (LED) is used. The wavelength of the light emitting element 4 is preferably a wavelength at which the transmission loss of the optical fiber 2 to be used is small and inexpensive. For example, POF as the optical fiber 2
In the case where is used, a semiconductor laser having a wavelength of 650 nm, which has a mass production effect on a DVD (digital video disk) or the like, can be used.

The light emitting element 4 is disposed on the transmission stem 8, and an operation bias and a signal modulation bias are applied through the transmission pin 18. The light receiving element 5 is arranged on the receiving stem 9, and an operation bias is applied through the receiving pin 19.

The optical fiber 2 is fixed in a plug 13, and the plug 13 can be inserted into and removed from a receptacle 14. The receiving stem 9 is fixed to a part of the receptacle 14. The transmission stem 8 is connected to the receptacle 14
Is fixed to the holding member 15 whose position can be adjusted. Thereby, in the bidirectional optical communication device 1, the receiving unit 21 is fixed to the receptacle 14, and the transmitting unit 22 is connected to the receiving unit 2 attached to the receptacle 14.
1.

Transmission and reception of optical signals (full-duplex communication) by the bidirectional optical communication device 1 are performed according to the following procedure (operation).

As shown in FIG. 1, the transmission light 16 generated by the light emitting element 4 diverges radially according to the radiation angle of the light emitting element 4. Thereafter, the light is converted into an arbitrary numerical aperture by the transmission lens 6 and condensed, passes through the aperture 12 of the converging mirror 7, and is coupled to the optical fiber 2.

On the other hand, the received light 17 propagating through the optical fiber 2 diverges radially in accordance with the numerical aperture of the optical fiber 2, is almost totally reflected by the reflection film 11 of the condenser mirror 7, and is coupled to the light receiving element 5. .

A part of the transmission light 16 is reflected by the end face 2a of the optical fiber 2 on the transmission light incident side. In the bidirectional optical communication device 1 according to the present embodiment, the transmission light 16 By returning most of the transmission light reflected by the end face 2a to the opening 12 of the condenser mirror 7, interference due to near-end reflection is prevented.

As described above, the transmitting lens 6 is formed on a part of the converging mirror 7 which is a receiving optical member, and the transmitting lens 6 forming surface of the converging mirror 7 also serves as a cover of the light emitting element 4. The cover of the light emitting element 4 and the receiving optical member can be formed of the same member, and there is no need to separately provide the cover of the light emitting element 4, so that the compact and inexpensive bidirectional optical communication device 1 can be obtained. . Also, by electrically separating the transmitting stem 8 and the receiving stem 9, the S / N value (signal to noise rati) caused by electrical noise is increased.
o) can be suppressed, and the operation check of the light emitting element 4 and the operation check of the light receiving element 5 can be performed separately. Therefore, if any one is defective, replace one of them. You can just respond.

On the other hand, in the two-way optical communication device 1 which separates the transmission light and the reception light by space, unless the incident angle and the incident position of the transmission light 16 on the optical fiber 2 are controlled with high precision, the optical fiber 2 cannot be transmitted. Is coupled to the light receiving element 5 and causes interference.

The bidirectional optical communication device 1 according to the present embodiment
Here, the position of the light emitting element 4 can be adjusted by moving the holding member 15. Thereby, in the two-way optical communication device 1 according to the present embodiment, by adjusting the position of the holding member 15 at the time of assembling the two-way optical communication device 1, the light emitting element 4 can be moved to an optimal position, for example, The incident angle and the incident position of the transmission light 16 with respect to the optical fiber 2 can be adjusted to the optimum positions, and the assembly can be performed with high accuracy.

Next, a method of assembling the bidirectional optical communication device 1 will be described below with reference to FIGS. First, the receiving unit 21 is manufactured. As shown in FIG. 3A, a positioning block 20a
20b, and these positioning blocks 20a
In accordance with b, the condenser mirror 7 and the light receiving element 5 are respectively arranged and fixed. On the receiving stem 9, a preamplifier (not shown) is arranged near the light receiving element 5, and wiring is performed by wires (not shown). A capacitor (not shown) is arranged in parallel with the light receiving element 5 below the light receiving element 5 on the receiving stem 9 to reduce power supply noise.

Next, as shown in FIG. 3B, the receptacle 14 is attached to the receiving section 21. The alignment between the two can be performed by passive alignment, for example, by forming a positioning reference for each of them and aligning the portions. Alternatively, the receiving unit 2
1 is made movable with respect to the receptacle 14, light is incident from an end face 2b (not shown) of the optical fiber 2 (see FIG. 4) and received by the light receiving element 5 of the receiving section 21, and this signal (received light amount) is maximized. The active alignment may be performed by fixing the receiving unit 21 at a position where.
Thereby, the reception efficiency of the reception light can be further improved.

On the other hand, the transmission section 22 is manufactured as follows. First, as shown in FIG. 3C, the light emitting element 4 and the monitoring photodiode 23 are arranged on the transmission stem 8 and wiring is performed. Next, the transmission stem 8 is fixed to the holding member 15, and at this time, the operation of the light emitting element 4 is checked.

The two-way optical communication device 1 according to the present embodiment
Thus, since the transmission stem 8 and the reception stem 9 are separated from each other, the operation check of the light emitting element 4 and the operation check of the light receiving element 5 can be performed separately. For this reason, when there is a problem (defective) in either the light emitting element 4 or the light receiving element 5, it is possible to deal with it by only replacing one of them.

Further, in the bidirectional optical communication device 1 according to the present embodiment, since the transmitting stem 8 and the receiving stem 9 are separated from each other, the light emitting element 4 and the light receiving element 5 operate separately. For example, the holding member 15
By providing such a structure, the light emitting element 4 and the light receiving element 5 can be moved separately for each stem. Therefore, since the light emitting element 4 and the light receiving element 5 can be separately adjusted in position and fixed, a high-performance, high-yield bidirectional optical communication device can be provided.

Next, as shown in FIG. 3 (d), the transmitting section 22 receives the receiving section 21 having the receptacle 14 attached thereto.
, And are mounted in alignment. The holding member 15
As shown in FIG. 3D, the Z direction which is the optical axis direction of the optical fiber 2 and the XY orthogonal to the optical axis of the optical fiber 2
It is movable in a plane. Therefore, the holding member 15 is moved up and down (X direction), left and right (Y direction), and back and forth (Z direction) with respect to the receiving section 21 to be moved to the optimum position, as shown in FIG. 15 is fixed to the receiving unit 21. The method for determining the optimum position, that is, the receiving unit 2
3 (d) about the position adjustment of the transmission unit 22 with respect to
It will be described below with reference to FIGS.

In order to adjust the position of the transmitting section 22 with respect to the receiving section 21, the light emitting element 4 of the transmitting section 22 of the bidirectional optical communication device 1 to be assembled is operated in FIG. Transmitted light amount P emitted through
s is measured by the monitor light receiver 24, and the light receiving element 5 of the two-way optical communication device 1 to be assembled is operated, and among the transmission light emitted from the light emitting element 4 via the optical fiber 2, This is performed by measuring the reflected light amount Pr of the transmission light reflected by the end face 2a of the optical fiber 2.

The displacement of the light emitting element 4 in the Z direction with respect to the transmission lens 6 of the receiving unit 21 results in the displacement of the focal position of the optical fiber 2 in the optical axis direction, and the displacement in the XY directions corresponds to the incident position on the optical fiber 2. Will be shifted. If the incident position shifts, the reflection direction also changes, so that interference is likely to occur.
For this reason, it is necessary to position the XY direction with higher precision than the Z direction. In addition, as the number of axes for positioning the transmitting unit 22 increases, the assembling time increases.

Therefore, in the present embodiment, the position adjustment of the transmitting section 22 in the Z direction is performed with the receiving section 21 as a reference. More specifically, the positioning of the transmitting unit 22 in the Z direction is performed by pressing the transmitting unit 22 against the receptacle 14 or the cover unit 10 of the receiving unit 21, thereby orthogonally intersecting the optical axis of the optical fiber 2. The positioning of the transmission unit 22 is performed in the XY plane.

On the other hand, the position adjustment of the transmitting section 22 in the XY directions is performed by measuring the transmitted light amount Ps and the reflected light amount Pr of the transmitted light. First, the light emitting element 4 of the transmitting section 22 of the two-way optical communication device 1 to be assembled is operated, and the transmitting section 22 is moved in the X direction and the Y direction shown in FIGS. Accordingly, the transmission light amount P emitted from the light emitting element 4 via the optical fiber 2
The change in s (the amount of emitted light) is measured by the monitor light receiver 24. For example, when the transmission unit 22 is moved from the reference position in the X direction and the transmission light amount Ps is measured, the transmission light amount Ps changes as shown in FIG. At this time, for example, the transmission unit 22 is moved to the other end with one end of the movable range of the transmission unit 22 in the X direction as a reference position. From the measurement result of the transmission light amount Ps, in the X direction, a position range X ₁ -X ₅ (hereinafter, coarse adjustment range) in which a transmission light amount Ps equal to or more than Ps (th) necessary for performing full-duplex communication is obtained. ).

As described above, the positional deviation of the transmitting section 22 in the XY directions is caused by the transmission light incident surface (end face) of the transmission light 16 (see FIG. 1) incident on the optical fiber 2 from the light emitting element 4. 2a). Therefore, when the transmission unit 22 is moved in the X direction or the Y direction, the transmission light 16 is coupled to the optical fiber 2 and emitted according to the angle of incidence of the transmission light 16 on the transmission lens 6 and the opening 12 of the condenser mirror 7. The transmission light amount Ps of the transmission light changes. As the displacement of the transmission light 16 with respect to the optical fiber 2 is larger,
The transmission light amount Ps decreases. Conversely, the greater the degree of overlap of the optical axis of the transmission light 16 with the optical axis of the optical fiber 2, the greater the amount of transmitted light Ps. Therefore, the transmission unit 22
Is moved from the reference position in the X direction, and the transmission light amount Ps is measured. As shown in FIG.
It gradually increases according to the amount of movement, and then gradually decreases.

Next, in FIG. 4, the amount of reflected light Pr of the transmission light 16 is measured by operating the light receiving element 5 of the receiving unit 21. At this time, for example, the transmission unit 22 is moved within the coarse adjustment range obtained from the measurement result of the transmission light amount Ps,
The relationship between the position of the transmission unit 22 and the amount of reflected light Pr is measured.
For example, by moving the transmitting unit 22 in the X direction, the reflected light amount P
When r is measured, the reflected light amount Pr changes as shown in FIG. Therefore, in the coarse range, that is, by moving the transmission portion 22 between the X ₁ to X _5, the reflected light quantity Pr in the X direction, satisfies the S / N value required for full-duplex communication Pr ( th) Position range X ₂ −X having the following value
₄ finds a (hereinafter referred to as fine adjustment range), by fixing the transmitter 22 at a position between from the X ₂ to X _4, position adjustment of the transmitter 22 is performed.

As described above, a part of the transmission light 16 is reflected by the end face 2a of the optical fiber 2 on the transmission light incident side, but the displacement of the transmission part 22 in the X and Y directions is caused by the light emitting element 4 Of the transmission light 16 incident on the optical fiber 2 with respect to the transmission light incident surface (end face 2a) of the optical fiber 2, and the deviation of the incident position of the transmission light 16 changes the reflection direction. At this time, due to the displacement of the transmission light 16 with respect to the transmission light incidence surface (end surface 2a) of the optical fiber 2, the transmission light reflected on the transmission light incidence side end surface 2a of the optical fiber 2 becomes
The larger the amount of light reflected by the reflection film 11 provided on the concave surface of the condenser mirror 7 and condensed on the light receiving element 5, the greater the amount of reflected light Pr. On the other hand, the greater the amount of reflected light returning to the opening 12 of the condenser mirror 7, the smaller the amount of reflected light Pr. Therefore, when the transmitting unit 22 is moved in the X direction or the Y direction, as shown in FIG. 5B, the transmission light amount Ps is high and the reflection light amount Pr is remarkable depending on the incident angle of the transmission light 16 to the optical fiber 2. There is a position range that decreases.

As described above, the end face 2b of the optical fiber 2 on the transmission light emission side as viewed from the two-way optical communication device 1 on the assembly target side.
The amount of outgoing light (transmitted light amount Ps) is measured, and the position of the transmitting section 22 (that is, the position of the light emitting element 4) is adjusted so that the outgoing light amount (transmitted light amount Ps) becomes a constant value (Ps (th)).
After the coarse adjustment at the positions described above, the reflected light amount Pr (near-end reflected light amount) of the transmission light 16 from the end surface 2a on the transmission light incident side of the optical fiber 2 is measured by the light receiving element 5, and the reflected light amount is measured. By finely adjusting and fixing the position of the transmitting unit 22 at a position where the fixed value (Pr (th)) or less,
Interference due to reflected light can be reliably reduced, and the bidirectional optical communication device 1 with high performance and good yield can be obtained. Further, according to the above method, the coarse adjustment is performed by measuring the amount of emitted light (the amount of transmitted light Ps) in advance, so that fine adjustment can be performed within a range where the transmitted light always enters the optical fiber 16. .

In an optical fiber communication system, its performance is generally represented by an error rate (BER: bit error rate). This is the number Ne of errors that occurred during a certain time t.
Is the number Nt of pulses (signals) transmitted within the time t.
Divided by BER depends on the signal-to-noise ratio,
The minimum required optical signal power level is determined by the error rate request in the system and the noise level of the receiver (receiver). Generally, the BER is on the order of 10 ^-6 to 10 ^-12 , but this is appropriately determined according to the target system (or standard).

Assuming that the received signal light amount is S, the optical noise due to reflected light and the like is Nopt, and the electrical noise due to the receiver amplifier and the like is Nel, the SN ratio is (S-Nopt) /
It is represented by Nel. Therefore, the S / N ratio is set to a value or more determined by BER. The relationship between BER and SN ratio is
It is calculated by a probability statistical method. For example, when the BER is 10 ⁻¹² , the SN ratio is generally 23 dB or more.

The signal light quantity S is obtained by multiplying the light quantity emitted from the optical fiber (the transmission light quantity Ps) by the reception efficiency R (Ps ×
R). Nopt is the reflected light amount Pr due to near-end reflection.
(Pr + Pr2) obtained by adding the reflected light amount Pr2 due to the far-end reflection and the stray light. The electric noise Nel is determined by the common path characteristics to be used.

Therefore, Pr (th), Ps (th)
Is a value that satisfies the SN ratio determined from the required BER. The reflected light amount Pr is higher than Pr (th), or
When the transmission light amount Ps is lower than Ps (th), the BER deteriorates because the SN ratio deteriorates. The lower the amount of reflected light Pr is, the better. However, if the amount of transmitted light Ps is too high, an amount of light higher than the operating power may be incident on the receiver (receiving unit). May have been determined.

As described above, in the present embodiment, the transmitting unit 22 can perform the position adjustment by performing the coarse adjustment as described above and then performing the fine adjustment. , The light receiving element 5 and the monitor light receiver 24 are simultaneously operated to simultaneously measure the transmitted light amount Ps and the reflected light amount Pr, and the transmitted light amount Ps is equal to or larger than Ps (th), and the reflected light amount Pr is Pr (th). The position adjustment may be performed by fixing the transmission unit 22 in the following position range.

As described above, by monitoring the amount of reflected light Pr and determining the position of the transmitting unit 22, the reflected light Pr
It is possible to reliably reduce the interference of the transmitted light with the received light,
The bidirectional optical communication device 1 with high performance and high yield can be obtained.

When the light emitting element 4, the light receiving element 5, and the monitor light receiver 24 are simultaneously operated to simultaneously measure the transmitted light amount Ps and the reflected light amount Pr, the difference between the transmitted light amount Ps and the reflected light amount Pr is calculated from the transmitted light amount Ps. Subtracted value (light amount P: P =
Ps-Pr) is monitored, and this value is a position range in which a value equal to or more than P (th) that satisfies the S / N value required for performing full-duplex communication, preferably the light amount P is the maximum. By fixing the transmission unit 22 at the position where the transmission unit 22 becomes, the transmission unit 22 can be positioned at a position where the S / N is good or the best.

For example, in the same manner as described above,
When the difference between the transmitted light amount Ps and the reflected light amount Pr is measured, as shown in FIG. 6, the P / S satisfying the S / N value required for performing full-duplex communication at a certain range of positions is obtained. (T
h) The above light amount P is obtained. This position is shown in FIG.
And the measurement result shown in FIG.
s is equal to or greater than Ps (th), and the amount of reflected light Pr is P
This corresponds to a position range X ₂ -X ₄ which is equal to or less than r (th).

According to the above method, the transmission light amount Ps
Monitor the value (light amount P) obtained by subtracting the reflected light amount Pr from the
This value satisfies the S / N value required for performing full-duplex communication.
Position range X where a value equal to or greater than P (th) to be added is obtained_Two-X
_FourParticularly preferably, in FIG. 6, the transmission light amount Ps and the reflection
Position X at which the difference from light amount Pr is maximum_ThreeFix the transmission unit 22 with
Setting enables reliable two-way optical communication with full-duplex communication.
The communication device 1 can be obtained. In FIG.
The position X where the difference between the transmitted light amount Ps and the reflected light amount Pr is maximum._Three
Represents the measurement results shown in FIGS. 5 (a) and 5 (b).
Therefore, the transmission light amount Ps is equal to or larger than Ps (th), and
Position range X where the amount of emitted light Pr is a minimum value _ThreeCorresponding to
According to the above method, the transmission light amount Ps (emission light amount) and the reflection
The light emitting element 4 is aligned at a position where the difference from the light quantity Pr is maximized.
And the maximum S / N value
It is possible to adjust the light emitting element 4 in different positions.

In the above description, the transmission unit 22
Is moved in the X direction to adjust the position of the transmission unit 22 in the X direction with respect to the reception unit 21 by active alignment (that is, the holding member 15 of the transmission unit 22 or the receptacle 14 of the light emitting element 4 to which the reception unit 21 is attached).
The optical fiber 2 held by the
Although the method for performing the position adjustment in the X direction with respect to one light receiving element 5 has been described as an example, the above method is not applied only to the position adjustment in the X direction, and the position adjustment in the Y direction is performed by the same method. It can be performed.

Further, the present invention is not limited to the X and Y directions.
Position adjustment in the direction may be performed. By performing position adjustment in the Z direction in the same manner as described above, positioning can be performed with high accuracy, and a bidirectional optical communication device with a better S / N value can be obtained.

On the other hand, as described above, when adjusting the position of the transmitting unit 22 in the Z direction, the position adjustment in a direction where assembly accuracy is relatively low is determined as passive alignment, and the position adjustment in a direction requiring high-precision assembly is performed. Is an active alignment, the position adjustment of the light emitting element 4 in the Z direction is performed in one plane facing the optical fiber 2, that is, in the XY plane orthogonal to the optical axis of the optical fiber 2, thereby shortening the time. Thus, the two-way optical communication device 1 can be assembled.

The position adjustment of the transmission unit 22 with respect to the reception unit 21 is performed by adjusting the transmission light amount Ps and the reflected light amount Pr in each XYZ direction.
Centering on the position (optimal position) where the difference from
The direction is preferably within a range of ± 30 μm, and the XY direction is preferably within a range of ± 10 μm.

As described above, the method for assembling the two-way optical communication device according to the present embodiment comprises a light emitting element for transmitting transmission light to an optical fiber and a light receiving element for receiving reception light emitted from the optical fiber. A holding member for holding the light emitting element movably at least in a plane orthogonal to the optical axis direction of the optical fiber, and bidirectional optical communication for transmitting and receiving optical signals in one direction by one optical fiber. A method for assembling a device, comprising: measuring an output light amount of transmission light emitted from the optical fiber, and a reflection light amount of transmission light reflected by an end face of the optical fiber and incident on the light receiving element; The amount of transmitted light emitted from the optical fiber,
This is a method in which the position is adjusted and fixed based on the reflected light amount of the transmission light measured by the light receiving element.

In other words, the method for assembling the bidirectional optical communication device according to the present embodiment includes a light emitting element for transmitting and receiving an optical signal bidirectionally by using one optical fiber, and for transmitting transmission light to the optical fiber. A method for assembling a two-way optical communication device having a light receiving element for receiving reception light emitted from the optical fiber and a receptacle for holding the optical fiber with a plug and holding the optical fiber and the plug, wherein the receptacle An assembling method for adjusting a position of a light emitting element holding portion having the light emitting element with respect to the held optical fiber or the light receiving element.

According to the above method, the holding member is moved, and the holding member is moved based on the amount of transmitted light emitted from the optical fiber and the amount of reflected transmitted light measured by the light receiving element. By performing the position adjustment, it is possible to adjust the position of the transmission optical system (light emitting element) requiring high-accuracy position adjustment (alignment) by active alignment, and to perform the position adjustment with the transmission optical system (light emitting element) and the optical fiber. Alternatively, position adjustment with the receiving optical system (light receiving element) becomes possible. Therefore, it is possible to obtain a high-performance, high-yield bidirectional optical communication device. In addition, by measuring (monitoring) the amount of transmitted light and the amount of reflected light and performing the above-described assembly, it is possible to obtain an S / N value suitable for bidirectional transmission and reception of an optical signal using one optical fiber. At the same time, it is possible to reliably prevent the transmission light from being interfered with the reception light, that is, the interference of the near-end reflected light from the reception light. Further, both the reception efficiency of the reception light and the transmission efficiency of the transmission light can be improved. Therefore, it is possible to provide a method for assembling a two-way optical communication device capable of obtaining a high-performance, high-yield two-way optical communication device.

Further, a method for assembling a two-way optical communication apparatus according to the present embodiment includes a light emitting element for transmitting transmission light to an optical fiber, and a light receiving element for receiving reception light emitted from the optical fiber. An assembling method of a bidirectional optical communication device for transmitting and receiving an optical signal bidirectionally by one optical fiber, comprising: an emission light amount of transmission light emitted from the optical fiber; The reflected light amount of the transmitted light incident on the light receiving element is measured, and the position of the light emitting element is adjusted to a position where the emitted light amount is equal to or more than a certain value, and the reflected light amount is equal to or less than a certain value, and is fixed. How to

More specifically, a method for assembling a two-way optical communication device according to the present invention includes a light-emitting element for transmitting and receiving an optical signal in one direction through one optical fiber, and transmitting light to the optical fiber. A method for assembling a two-way optical communication device, comprising: a light-receiving element that receives reception light emitted from the optical fiber; and a receptacle that fixes the optical fiber with a plug and holds the optical fiber and the plug. After measuring the amount of light emitted from the other end of the optical fiber, adjusting the position of the light emitting element, and coarsely adjusting the position where the amount of emitted light is a certain value or more, the transmission light from the end face of the optical fiber is adjusted. In this method, the amount of reflected light is measured by the light receiving element, and the position of the light emitting element is finely adjusted and fixed at a position where the amount of reflected light is equal to or less than a predetermined value.

According to the above method, the position of the light emitting element is adjusted and fixed at a position where the amount of emitted light is equal to or more than a certain value and the amount of reflected light is equal to or less than a certain value. With this optical fiber, it is possible to obtain an S / N value suitable for transmitting and receiving an optical signal in both directions, and to reliably prevent transmission light from interfering with received light. In addition, by adjusting the position of the light emitting element based on the amount of emitted light and the amount of reflected light, the position of the light emitting element requiring high-accuracy position adjustment (alignment) can be adjusted by active alignment, and The position of the light emitting element and the optical fiber or the light receiving element can be adjusted. Further, both the reception efficiency of the reception light and the transmission efficiency of the transmission light can be improved. Therefore, it is possible to provide a method for assembling a two-way optical communication device capable of obtaining a high-performance, high-yield two-way optical communication device.

Further, by coarsely adjusting the position of the light emitting element in advance by the amount of transmitted light, fine adjustment can be made within a range where the transmitted light always enters the optical fiber.

The method for assembling a two-way optical communication device according to the present embodiment includes a light emitting element for transmitting transmission light to an optical fiber, and a light receiving element for receiving reception light emitted from the optical fiber. An assembling method of a bidirectional optical communication device for transmitting and receiving an optical signal bidirectionally by one optical fiber, comprising: an emission light amount of transmission light emitted from the optical fiber; This method measures the amount of reflected light of transmission light incident on a light receiving element, adjusts the position of the light emitting element to a position where the difference between the amount of emitted light and the amount of reflected light becomes a certain value or more, and fixes the position.

More specifically, optical signals are bidirectionally transmitted and received by one optical fiber, and a light emitting element for transmitting transmission light to the optical fiber and receiving light emitted from the optical fiber are received. An assembling method having a light receiving element, wherein the amount of reflected light from the end face of the optical fiber of the transmission light is measured by the light receiving element, and the amount of light emitted from the other end of the optical fiber of the transmission light is measured. In this method, the position of the light emitting element is adjusted and fixed at a position where the difference between the amount of emitted light and the amount of reflected light is maximized.

According to the above method, the position of the light emitting element is adjusted and fixed at a position where the difference between the amount of emitted light and the amount of reflected light is equal to or greater than a certain value, so that a single optical fiber can be used. S / N suitable for transmitting and receiving optical signals
The value can be obtained, and interference of transmission light with reception light can be reliably prevented. In addition, by adjusting the position of the light emitting element based on the amount of emitted light and the amount of reflected light, the position of the light emitting element requiring high-accuracy position adjustment (alignment) can be adjusted by active alignment, and The position of the light emitting element and the optical fiber or the light receiving element can be adjusted. For this reason,
It is possible to provide a method for assembling a bidirectional optical communication device capable of obtaining a high-performance, high-yield bidirectional optical communication device.

In this case, the position of the light emitting element is adjusted to a position where the difference between the emitted light amount and the reflected light amount is maximum and fixed, so that the position where the S / N value is maximum, that is, The light emitting element can be adjusted (positioned) to a position where the S / N value becomes the best for transmitting and receiving an optical signal in two directions by the optical fiber.

The two-way optical communication device according to the present embodiment includes components suitable for the method for assembling the two-way optical communication device, and is a two-way optical communication device assembled by the method. In a bidirectional optical communication device that includes a light emitting element that causes transmission light to enter a fiber, and a light receiving element that receives reception light emitted from the optical fiber, and performs bidirectional transmission and reception of an optical signal through a single optical fiber, The light receiving element functions as a reflected light measuring unit that measures the amount of reflected light of transmission light from the end face of the optical fiber, and the light emitting element can be moved at least in a plane orthogonal to the optical axis direction of the optical fiber. A holding member for holding, the holding member, the emission light amount of the transmission light from the optical fiber,
The position is adjusted and fixed based on the reflected light amount of the transmission light measured by the light receiving element.

In other words, the bidirectional optical communication apparatus according to the present embodiment spatially separates transmission light and reception light by using one optical fiber, and performs bidirectional transmission and reception of optical signals. A light-emitting element for transmitting transmission light to an optical fiber, and a reception element for receiving the reception light emitted from the optical fiber, the position of the light-emitting element is adjusted with respect to the optical fiber or the light-receiving element. This is a configuration having a light emitting element holding portion to be fixed.

According to the above arrangement, the position of the holding member is adjusted based on the amount of outgoing light of the transmitted light from the optical fiber and the amount of reflected light of the transmitted light measured by the light receiving element. It has an S / N value suitable for bidirectional transmission and reception of optical signals through a single optical fiber, and can prevent interference of near-end reflected light with received light, thereby improving reception efficiency of received light. It is possible to provide a high-performance, high-yield bidirectional optical communication device that can improve both the transmission efficiency and the transmission efficiency of transmission light.

In particular, by moving the light-emitting element holding portion having the light-emitting element with respect to the optical fiber or the light-receiving element held by the receptacle, the light-emitting element requiring high-precision position adjustment and the transmission optical system can be moved. Since the adjustment can be performed, a high-performance, high-yield bidirectional optical communication device can be obtained. At this time, since the receiving stem for supplying the operating bias to the light receiving element and the transmitting stem for supplying the operating bias to the light emitting element are electrically separated, the reduction of the S / N value due to the electric noise is achieved. Can be suppressed, and the operations of the light emitting element and the light receiving element can be separately confirmed.

Further, in the two-way optical communication device according to the present embodiment, since a part of the receiving optical system (receiving optical member) is used as the cover of the light-emitting element, both the size and the cost are reduced. An optical communication device can be obtained. Also,
In the two-way optical communication device according to the present embodiment, since the transmitting optical member is formed on the cover, the size and cost of the two-way optical communication device can be further reduced.

In a conventional two-way optical communication apparatus for performing full-duplex communication by spatially separating transmission light and reception light by one optical fiber, the transmission light and the reception light are separated from each other. It is necessary to dispose the light condensing optical system, so that the apparatus becomes complicated and large, and it is necessary to assemble with high accuracy.

However, in the two-way optical communication apparatus according to the present embodiment, the receiving optical member is formed with the receiving optical system (receiving optical member) and the transmitting optical system (transmitting optical member) from the same member. And the member (for example, a receiving optical member) has a structure also serving as a cover of the light emitting element.
It is possible to reduce the size and cost of the device. In addition, active alignment is adopted for the transmitter that requires high-precision alignment, and this position adjustment is performed by monitoring the amount of reflected light, so that interference due to reflected light is reliably reduced, and one optical fiber is used. It is possible to obtain a bidirectional optical communication device having a good S / N value even in a bidirectional optical communication device using a full-duplex communication method in which transmission light and reception light are spatially separated by using the method. Become.

[Embodiment 2] Another embodiment of the present invention will be described below with reference to FIG. In this embodiment, differences from Embodiment 1 will be mainly described, and members having the same functions as members used in Embodiment 1 will be assigned the same member numbers. And the description is omitted.

In the present embodiment, the receiving stem for supplying the operating bias to the light receiving element 5 via the transmitting pin 18 and the transmitting stem for supplying the operating bias to the light emitting element 4 via the receiving pin 19 are the same stem 34. A two-way optical communication device 1 ′ configured to spatially separate the transmission light 16 and the reception light 17 in the left-right direction of the optical fiber 2 to prevent interference will be described.

In this embodiment, the stem 34
Holds a silicon substrate 31 on which the light receiving element 5 is monolithically formed. On the silicon substrate 31,
The light emitting element 4 and a micromirror 32 that reflects the transmission light 16 emitted from the light emitting element 4 and rises toward the optical fiber 2 are arranged. The micromirror 32 is formed in the vicinity of the light receiving element 5, and has a height of about 30 μm, and is processed such that the mirror surface 32 a is inclined at about 45 degrees with respect to the silicon substrate 31. The micromirror 32 can be manufactured by a laser ablation process using an excimer laser using a photosensitive polyimide or the like as a base material. On the other hand, the light emitting element 4 is arranged at a position on the opposite side of the micromirror 32 from the light receiving element 5 and away from the light receiving element 5.

The silicon substrate 31 is movably provided, and is fixed to a holding member 15 whose position can be adjusted with respect to the receptacle 14. Thereby, the holding member 15 can adjust the position of the light emitting element 4 with respect to the optical fiber 2 and fix the light emitting element 4. That is, also in the present embodiment, the position of the light emitting element 4 can be adjusted by moving the holding member 15, and by adjusting the position of the holding member 15 when assembling the bidirectional optical communication device 1 ′. It is possible to assemble with high accuracy and to prevent interference.

On the optical axis of the optical fiber 2, a lens 33 fixed to the receptacle 14 is provided. The lens 33 includes a transmission optical member that NA-converts the transmission light 16 raised by the micromirror 32 and couples the transmission light 16 to the optical fiber 2, and a light-receiving element that collects the reception light 17 emitted from the optical fiber 2. 5 also serves as a receiving optical member.

In this embodiment, the optical fiber 2 is fixed in the plug 13, and the plug 13 can be inserted into and removed from the receptacle 14.

Next, a method for assembling the bidirectional optical communication device 1 'and a method for preventing interference in optical communication will be described below. Transmission and reception of optical signals (full-duplex communication) by the bidirectional optical communication device 1 'is performed as follows. The transmission light 16 raised by the micromirror 32 is condensed by the lens 33 and is incident on a position shifted from the optical axis center of the optical fiber 2. On the other hand, the received light 17 radiated from the optical fiber 2 is condensed by the lens 33 and is
Of the received light 17, the received light 17 radiated from a position near the position where the transmitted light 16 is incident on the optical fiber 2 is transmitted to the micromirror 3 by the light receiving element 5.
On the opposite side of the light emitting element 4 with respect to 2, the light emitting element 4 is raised by the micromirror 32 and formed at a position off the optical axis of the transmission light 16 coupled to the optical fiber 2. Light is condensed at a position other than the light receiving element 5.

Thus, the bidirectional optical communication device 1 ′ prevents the reflected light of the transmission light 16 from interfering with the reception light 17 and being coupled to the light receiving element 5. That is, in the bidirectional optical communication device 1 ′, the transmission light 16 and the reception light are located in the left-right direction of the optical fiber 2 (that is, the position of the optical fiber 2 from the light emitting element 4 forming part and the light receiving element 5 forming part). 17 is spatially separated to prevent interference.

Next, a method of assembling the bidirectional optical communication device 1 'will be described below. First, as a transmitting and receiving unit,
As shown in FIG. 7, the light receiving element 5 is formed monolithically, the light emitting element 4 and the micromirror are mounted on the silicon substrate 31 to hold the stem 34, and the wired stem 34 is connected to the holding member 15 To the light emitting element 4
The operation of the light receiving element 5 is confirmed.

The holding member 15 is movable in the direction of the optical axis of the optical fiber 2 and in a plane orthogonal to the optical axis of the optical fiber 2. Therefore, also in the present embodiment, the holding member 15 is moved to the optimum position, and the holding member 15 is attached to the receptacle 14 and fixed. The method of determining the optimum position, that is, the position adjustment of the holding member 15 with respect to the receptacle 14, is performed in the same manner as in the first embodiment.
6 is monitored by the light receiving element 5. That is, the light emitting element 4 is operated to
Out of the transmission light emitted from the optical fiber 2 through the optical fiber 2, the amount of reflected light Pr reflected on the end face 2a of the optical fiber 2 and incident on the light receiving element 5 is measured. The holding member 15 is adhered and fixed to the receptacle 14 at a position where the transmitted light amount Ps emitted from the optical fiber 4 via the optical fiber 2 is equal to or greater than a predetermined value.

In this embodiment, the transmission light amount Ps and the reflected light amount Pr are simultaneously monitored, and the holding member 15 is fixed to the receptacle 14 at a position where the difference between the transmitted light amount Ps and the reflected light amount Pr is maximized. You may.

As described above, also in the method of assembling the bidirectional optical communication device 1 'shown in the present embodiment, since the assembling is performed while monitoring the reflected light amount Pr of the transmission light 16, interference can be surely caused. It is possible to perform full-duplex communication using one optical fiber 2. Further, both the reception efficiency of the reception light and the transmission efficiency of the transmission light can be improved.

Also, as in the first embodiment, the bidirectional optical communication device 1 ′ according to the present embodiment also includes a light emitting element for transmitting transmission light to an optical fiber and receiving light emitted from the optical fiber. A two-way optical communication device that transmits and receives an optical signal bidirectionally through a single optical fiber, wherein the light-receiving element measures reflected light quantity of transmitted light from the end face of the optical fiber. A holding member that functions as a measuring unit and holds the light emitting element so as to be movable at least in a plane orthogonal to the optical axis direction of the optical fiber, wherein the holding member emits transmission light from the optical fiber. The position is adjusted and fixed based on the light amount and the reflected light amount of the transmission light measured by the light receiving element.

For this reason, according to the above configuration, the position of the holding member is adjusted based on the amount of outgoing light of the transmitted light from the optical fiber and the amount of reflected light of the transmitted light measured by the light receiving element. With this, it is possible to have an S / N value suitable for transmitting and receiving an optical signal in two directions by using one optical fiber, and to prevent interference of near-end reflected light with the received light. The present invention can provide a high-performance, high-yield bidirectional optical communication device that can improve both the reception efficiency and the transmission efficiency of transmission light.

Further, the bidirectional optical communication device 1 'according to the present embodiment includes a lens for collecting transmission light emitted from the light receiving element and coupling the light to an optical fiber. The transmission light emitted from the optical fiber is coupled to a position shifted from the optical axis center of the optical fiber, and the light receiving element is formed at a position away from the optical axis of the transmission light.

For this reason, in the present embodiment, of the received light, the received light radiated from a position near the position where the transmitted light is incident on the optical fiber is condensed to a position other than the light receiving element by the lens. By doing so, interference is prevented.

The structure and the assembling method shown in the present embodiment are merely examples, and it is needless to say that the same effect can be obtained by partially changing the structure.

[Embodiment 3] Still another embodiment of the present invention will be described below mainly with reference to FIGS. 8 (a) to 8 (d). In the present embodiment, an assembling method in the case of manufacturing a plurality of bidirectional optical communication devices will be described, and members having the same functions as the members used in the first embodiment are given the same member numbers. And the description is omitted.

In the following description, a case where a plurality of bidirectional optical communication devices 1 shown in FIG. 1 are manufactured will be described as an example. In order to distinguish the two-way optical communication devices 1, for convenience of explanation, reference bidirectional optical communication used in assembling the first two-way optical communication device 1 in FIGS. Apparatus 1
Was a two-way optical communication device 1A _0, 1 th two-way optical communication apparatus 1A ₁ a two-way optical communication device 1 is assembled, the two eyes in the assembly is two-way optical communication device 1 bi-directional optical communication device 1A _2, and similarly described as bidirectional optical communication devices 1A ₃ ,..., 1A _n−1, 1A _{n in the} order of assembly.

The first bidirectional optical communication device 1 is assembled.
Bidirectional optical communication device 1A for reference used when₀Receiving
Unit 21 to receiving unit 21A₀, The transmission unit 22 to the transmission unit 22A₀
And the reception of the bidirectional optical communication device 1 assembled in the first
Unit 21 to receiving unit 21A₁, The transmission unit 22 to the transmission unit 22A₁
Hereafter, according to the same rule, the second and third
..., N−1, N-th bidirectional optical communication device 1A
_Two, 1A_Three, ..., 1A_{n- 1,}1A_nReceiver and transmission
The member numbers of the sections are respectively set to the receiving section 21A._Two, 21A _Three,
…, 21A_n-1,21A_n, Transmission unit 22A_Two, 22
A_Three, ..., 22A_n-1,22A_nShall be described as
You.

First, the first bidirectional optical communication device 1A₁of
An assembling method will be described. First bidirectional optical communication device 1A
₁Is, as shown in FIG. 8A, a transmission unit 22A for reference.
₀Reference (reference side) two-way optical communication device 1A having
₀From the transmission light (transmission light 16; FIG.
1), and the bidirectional optical communication device 1A on the assembly side ₁
Receiving section 21A₁1 (light receiving element 5; FIG. 1)
2) so that the amount of received light is maximized.
1A₁Adjust the position of the receptacle (receptacle 1
4; see FIG. 1).

As a specific fixing method, reference is made to FIG. 3B and the mounting method of the receiving section 21 in the first embodiment, and the description thereof will be omitted. Although the case where active alignment is performed has been described here, passive alignment may be performed as described in the first embodiment.

[0120] When performing passive alignment, measurement and positioning of the receiving portions 21A ₁ based on the measurement result of the received light amount is measured as well as the position of the transmitter 22 based on the measurement result of the reflected light amount Pr in the first embodiment It can be easily performed by the same method as the adjustment. In addition,
The reference transmitting unit 22A ₀ and the reference receiving unit 21A _{0 in} the bidirectional optical communication device 1A ₀ on the reference side are adjusted to the optimal positions in advance by, for example, the method described in the first embodiment. I have.

Next, as shown in FIG.
The reflected light amount (reflected light amount Pr) from the end face 2a of the
Vertical bidirectional optical communication device 1A₁Receiving section 21A₁In
The transmitting unit 22A₁To
Adjust the position and fix. Transmission unit 22A₁Specific location
3 (c) and 3 (d) and FIGS.
FIG. 6 and the position of the transmission unit 22 in the first embodiment.
Refer to the description of the adjustment, and the description is omitted.
I do. Thus, the first bidirectional optical communication device 1A ₁Is completed
I do.

Next, as shown in FIG.
Bidirectional optical communication device 1A₁A two-way optical communication device for reference
And the two-way optical communication device 1A₁As above
Transmitting the transmission light (transmission light 16; see FIG. 1) by the procedure of
The bidirectional optical communication device 1A on the assembly side_TwoReceiving section 21A
_TwoReceiving unit 21A so that the amount of received light is maximized.
_TwoAdjust the position and fix.

Subsequently, as shown in FIG. 8C, the amount of light reflected from the end face 2a of the optical fiber 2 (the amount of reflected light Pr) is calculated as follows.
Receiving unit 21 in the bidirectional optical communication apparatus 1A ₂ the assembly side
By receiving at A _2, by the same procedure as described above,
To align the transmission section 22A ₂ and fixed. Now, the two first of the two-way optical communication apparatus 1A ₂ is completed.

Next, as shown in FIG. 8C,
Using two eyes of two-way optical communication apparatus 1A ₂ obtained in the previous step as a bidirectional optical communication system for reference, the assembly of the two-way optical communication device 1A ₃ of 3 th by the same procedure as described above I do.

Hereinafter, by repeating the same operation,
As shown in FIG. 8D, the N-th bidirectional optical communication device 1
Carry out the assembly of the A _n. At this time, if there is a defect in the transmission unit or the reception unit of the M-th bidirectional optical communication device,
In assembling the (M + 1) th bidirectional optical communication device, the (M-1) th bidirectional optical communication device is used as a reference bidirectional optical communication device.

[0126] Thus, one end of the optical fiber 2 (for example, the end face 2a side), arranged two-way optical communication device 1A _n of the assembly object, the other end (e.g. the end face 2b side)
The previously assembled bidirectional optical communication device 1A _n-1 is arranged as a bidirectional optical communication device for reference, and the previously assembled bidirectional optical communication device 1A _n-1 (bidirectional optical communication device for reference) ), A new bidirectional optical communication device 1A based on the light receiving element in the receiving section 21A _{n-1 and} the light emitting element 4 in the transmitting section 22A _n-1 .
By performing _n assembly of the receiving portion 21A _n-1 and transmission unit 22A _n-1 two-way communications device 1A _n-1 assembled earlier
Confirmation work, it is possible to perform simultaneously with the assembly of new two-way optical communication device 1A _n. For this reason, it is possible to save the trouble of separately confirming the operation after assembling, and to assemble the bidirectional optical communication device 1An _-1 more efficiently.

It should be noted that in FIGS.
The end face of the optical fiber 2 is used to distinguish the
2a, the bidirectional optical communication device to be assembled is arranged, and the optical fiber
A bidirectional optical communication device for reference is arranged on the end face 2b side of the fiber 2
The end face 2a and the end face 2b of the optical fiber 2
Are the two-way optical communication devices to be assembled
From the viewpoint, it is distinguished between the end face on the transmission light emission side and the end face on the reception light incidence side.
Separate, previously assembled, N-1st bidirectional
Optical communication device 1A_n-1Is left as is and newly assembled N
Th bidirectional optical communication device 1A_nTo the optical fiber 2
Of the two-way optical communication device for reference
And the (N-1) th bidirectional optical communication device 1A assembled earlier.
_n-1By arranging it on the opposite end to the
The measurement of the emitted light amount (transmitted light amount Ps)
First bidirectional optical communication device 1A for reference_n-1(Light receiving element
Using the above method.
Later, when assembling the (N + 1) th new bidirectional optical communication device
First, the reference (bidirectional optical communication device for reference (light receiving element)
N-1) bidirectional optical communication device 1 used as
A_{n- 1}(Light receiving element) removed and completed by previous assembly
Has not yet been used as a standard two-way optical communication device.
The previous (Nth) two-way optical communication device 1A_nBased on
Set as quasi (two-way optical communication device (light receiving element) for reference)
By repeating the standing, the (N + 1) th new both sides
What is necessary is just to manufacture an optical communication device.

As described above, the method for assembling the two-way optical communication apparatus according to the present embodiment includes a light emitting element for transmitting transmission light to an optical fiber and a light receiving element for receiving reception light emitted from the optical fiber. A method for assembling a two-way optical communication device for assembling a plurality of two-way optical communication devices for transmitting and receiving optical signals in two directions by using a single optical fiber,
The first or second embodiment is connected to one end of the optical fiber.
The bidirectional optical communication device assembled by the method for assembling a two-way optical communication device described in (1) is arranged, and the bidirectional optical communication device to be assembled is arranged at the other end, according to the first or second embodiment. The bidirectional optical communication device assembled by the method for assembling a bidirectional optical communication device according to the present invention is used as a bidirectional optical communication device for reference, and bidirectional optical communication is performed by transmitting and receiving optical signals bidirectionally through the optical fiber. This is a method for adjusting the position of the light emitting element and the light receiving element of the device.

In other words, the method for assembling the bidirectional optical communication device according to the present embodiment includes a light emitting element for transmitting and receiving an optical signal bidirectionally by using one optical fiber, and for transmitting transmission light to the optical fiber. An assembling method for assembling a plurality of bidirectional optical communication devices each having a light-receiving element for receiving reception light emitted from the optical fiber, the method for assembling a bidirectional optical communication device according to the first or second embodiment. In this method, the created bidirectional optical communication device for reference is arranged at the other end of the optical fiber, and a new bidirectional optical communication device is assembled based on the light emitting element and the light receiving element of the bidirectional optical communication device for reference.

According to the above method, the operation of the bidirectional optical communication device for reference is confirmed, that is, in the first or second embodiment.
The operation check of the light emitting element and the light receiving element of the two-way optical communication device assembled by the assembling method of the two-way optical communication device described in the above can be performed at the time of assembling the two-way optical communication device to be assembled. Since it is not necessary to perform the confirmation, it is possible to assemble the bidirectional optical communication device with higher efficiency.

[0131]

As described above, the method for assembling a two-way optical communication device according to the present invention comprises: a light emitting element for transmitting transmission light to an optical fiber; a light receiving element for receiving reception light emitted from the optical fiber; A holding member for holding the light emitting element movably at least in a plane orthogonal to the optical axis direction of the optical fiber, and a bidirectional optical communication device for transmitting and receiving an optical signal bidirectionally by one optical fiber The assembling method of the above, measuring the emitted light amount of the transmitted light emitted from the optical fiber, and the reflected light amount of the transmitted light reflected on the end face of the optical fiber and incident on the light receiving element, the holding member ,
This is a method of adjusting the position based on the amount of transmitted light emitted from the optical fiber and the amount of reflected light of the transmitted light measured by the light receiving element, and fixing the position.

Therefore, it is possible to adjust the position of the light emitting element that requires high-accuracy position adjustment by active alignment, and to adjust the position of the light emitting element and the optical fiber or the light receiving element. Also, by monitoring the transmitted light amount and the reflected light amount and performing the above assembly,
With one optical fiber, an S / N value suitable for bidirectional transmission and reception of optical signals can be obtained, and interference of transmission light with reception light can be reliably prevented.
Further, both the reception efficiency of the reception light and the transmission efficiency of the transmission light can be improved. For this reason, it is possible to provide a method for assembling a bidirectional optical communication device capable of obtaining a high-performance, high-yield bidirectional optical communication device.

As described above, the method for assembling a two-way optical communication device according to the present invention comprises: a light emitting element for transmitting transmission light to an optical fiber; and a light receiving element for receiving reception light emitted from the optical fiber. An assembling method of a bidirectional optical communication device for transmitting and receiving an optical signal bidirectionally by one optical fiber, comprising: an emission light amount of transmission light emitted from the optical fiber; The reflected light amount of the transmitted light incident on the light receiving element is measured, and the position of the light emitting element is adjusted to a position where the emitted light amount is equal to or more than a certain value, and the reflected light amount is equal to or less than a certain value, and is fixed. How to

Therefore, it is possible to obtain an S / N value suitable for bidirectional transmission and reception of an optical signal using a single optical fiber, and to reliably prevent transmission light from interfering with reception light. Can be. Further, the position of the light emitting element,
By adjusting based on the amount of emitted light and the amount of reflected light,
It is possible to adjust the position of a light emitting element that requires high-accuracy position adjustment by active alignment, and to adjust the position of the light emitting element and the optical fiber or the light receiving element. Further, both the reception efficiency of the reception light and the transmission efficiency of the transmission light can be improved. For this reason, it is possible to provide a method for assembling a bidirectional optical communication device capable of obtaining a high-performance, high-yield bidirectional optical communication device.

In the method for assembling a two-way optical communication device according to the present invention, as described above, the position adjustment of the light emitting element is performed by roughly adjusting the position of the light emitting element at a position where the amount of emitted light is equal to or more than a predetermined value. Thereafter, this method is performed by performing fine adjustment at a position where the amount of reflected light is equal to or less than a certain value.

Therefore, there is an effect that the fine adjustment can be performed within the range where the transmission light always enters the optical fiber by the coarse adjustment.

As described above, the method for assembling a two-way optical communication device according to the present invention comprises: a light emitting element for transmitting transmission light to an optical fiber; and a light receiving element for receiving reception light emitted from the optical fiber. An assembling method of a bidirectional optical communication device for transmitting and receiving an optical signal bidirectionally by one optical fiber, comprising: an emission light amount of transmission light emitted from the optical fiber; This method measures the amount of reflected light of transmission light incident on a light receiving element, adjusts the position of the light emitting element to a position where the difference between the amount of emitted light and the amount of reflected light becomes a certain value or more, and fixes the position.

Therefore, it is possible to obtain an S / N value suitable for bidirectional transmission and reception of an optical signal with a single optical fiber, and to reliably prevent transmission light from interfering with reception light. Can be. Further, the position of the light emitting element,
By adjusting based on the amount of emitted light and the amount of reflected light,
It is possible to adjust the position of a light emitting element that requires high-accuracy position adjustment by active alignment, and to adjust the position of the light emitting element and the optical fiber or the light receiving element. Further, both the reception efficiency of the reception light and the transmission efficiency of the transmission light can be improved. For this reason, it is possible to provide a method for assembling a bidirectional optical communication device capable of obtaining a high-performance, high-yield bidirectional optical communication device.

As described above, the method for assembling a two-way optical communication device of the present invention is a method for adjusting the position of the light emitting element in a plane orthogonal to the optical axis direction of the optical fiber.

Therefore, active alignment based on the above-described assembling method is not employed for position adjustment of the optical fiber on a plane other than the plane orthogonal to the optical axis direction, which requires high-precision position adjustment. And the bidirectional optical communication device can be assembled in a shorter time.

As described above, the method for assembling a two-way optical communication device according to the present invention includes: a light-emitting element for transmitting transmission light to an optical fiber; and a light-receiving element for receiving reception light emitted from the optical fiber. An assembling method of a bidirectional optical communication device for assembling a plurality of bidirectional optical communication devices for transmitting and receiving an optical signal in two directions using one optical fiber, the method comprising: The two-way optical communication device assembled by the method for assembling the two-way optical communication device described above is arranged, and the other end is provided with the two-way optical communication device to be assembled. Using the assembled bidirectional optical communication device as a reference bidirectional optical communication device, transmitting and receiving optical signals bidirectionally through the optical fiber, and positioning the light emitting element and the light receiving element of the bidirectional optical communication device to be assembled. Adjustment It is a way to do.

Therefore, the operation check of the light emitting element and the light receiving element of the two-way optical communication device assembled by the above-described method of assembling the two-way optical communication device is performed at the time of assembling the two-way optical communication device to be assembled. Since it becomes possible to perform the operation check separately, it is possible to assemble the bidirectional optical communication device with higher efficiency.

As described above, the two-way optical communication device of the present invention includes the light emitting element for transmitting the transmission light to the optical fiber and the light receiving element for receiving the reception light emitted from the optical fiber. In a bidirectional optical communication device for transmitting and receiving an optical signal bidirectionally by an optical fiber, the light receiving element functions as a reflected light measuring unit that measures the amount of reflected light of transmission light from the end face of the optical fiber, and the light emitting element Comprises a holding member movably holding at least in a plane orthogonal to the optical axis direction of the optical fiber, the holding member,
The position is adjusted and fixed based on the amount of transmitted light emitted from the optical fiber and the amount of reflected transmitted light measured by the light receiving element.

Therefore, it is possible to have an S / N value suitable for transmitting and receiving an optical signal in one direction through one optical fiber, and to prevent interference of the near-end reflected light with the received light. There is an effect that it is possible to provide a high-performance and high-yield bidirectional optical communication device capable of improving both the reception efficiency of the reception light and the transmission efficiency of the transmission light.

As described above, the two-way optical communication device of the present invention includes the receiving stem for supplying the operating bias to the light receiving element and the transmitting stem for supplying the operating bias to the light emitting element. In this configuration, the transmission system is electrically separated from the transmission system.

Therefore, a decrease in S / N value due to electric noise can be suppressed. In addition, since the operation check of the light emitting element and the operation check of the light receiving element can be performed separately, if either of them is defective, it can be dealt with only by replacing one of them. Further, according to the above configuration, the light emitting element and the light receiving element can be operated separately, and by providing the holding member as described above, the light emitting element and the light receiving element are separately moved for each stem. It becomes possible. Therefore, since the light emitting element and the light receiving element can be separately adjusted in position and fixed, it is possible to provide a high-performance, high-yield bidirectional optical communication device.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of a bidirectional optical communication device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a schematic configuration of a bidirectional communication link shown in FIG. 1;

FIGS. 3A to 3D are diagrams illustrating a method of assembling the two-way optical communication device illustrated in FIG. 1;

FIG. 4 is a schematic diagram illustrating a method for adjusting the position of a transmission unit when assembling the bidirectional optical communication device according to one embodiment of the present invention.

FIG. 5A is a graph showing the relationship between the position in the X direction of the transmitting unit of the two-way optical communication device according to one embodiment of the present invention and the amount of transmitted light, and FIG. 6 is a graph showing a relationship between a position in the X direction of the transmitting unit of the bidirectional optical communication device according to the embodiment and the amount of reflected light.

FIG. 6 is a graph showing the relationship between the position in the X direction of the transmission unit of the two-way optical communication device according to the embodiment of the present invention and the difference between the amount of transmitted light and the amount of reflected light.

FIG. 7 is a cross-sectional view illustrating a schematic configuration of a bidirectional optical communication device according to another embodiment of the present invention.

FIGS. 8A to 8D are explanatory views showing a method of assembling a plurality of bidirectional optical communication devices.

FIG. 9 is an explanatory diagram showing a schematic configuration of a conventional bidirectional optical communication device.

[Explanation of symbols]

1 two-way optical communication device 1A ₀ two-way optical communication apparatus 1A _first bidirectional optical communication apparatus 1A ₂ two-way optical communication device 1A ₃ two-way optical communication device 1A _n-1 bi-directional optical communication device 1A _n two-way optical communication device 2 optical fiber 2a end face 2b end face 3 bidirectional optical communication link 4 light emitting element 5 light receiving element 8 transmitting stem 9 receiving stem 15 holding member 16 transmitting light 17 receiving light 18 transmitting pin 19 receiving pin 21 receiving section 21A ₀ receiving section 21A ₁ receiving part 21A ₂ receiver 21A ₃ receiving unit 21A _n-1 reception section 21A _n receiver 22 transmission unit 22A ₀ transmitting unit 22A ₁ transmission section 22A ₂ transmission unit 22A _n-1 transmission section 22A _n transmitter 23 the monitoring photodiode 24 Monitor receiver 34 Stem Ps Transmitted light amount (Emitted light amount) Pr Reflected light amount

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 10/12 (72) Inventor Toshihiro Tamura 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka (72) Inventor Yukio Kurata 22-22 Nagaikecho, Abeno-ku, Osaka City, Osaka F-term (in reference) 2H037 AA01 BA02 BA11 CA37 DA03 DA06 DA18 5K002 AA01 AA03 BA13 BA14 BA15 BA21 BA31 DA04 FA01

Claims (8)

[Claims] A light-emitting element for transmitting transmission light to the optical fiber; a light-receiving element for receiving reception light emitted from the optical fiber; and a light-emitting element arranged at least in a plane orthogonal to the optical axis direction of the optical fiber. A holding member movably held by the optical fiber, and an assembling method of a bidirectional optical communication device for transmitting and receiving an optical signal bidirectionally by one optical fiber, comprising: an emission of transmission light emitted from the optical fiber. A light amount and a reflected light amount of the transmitted light reflected on the end face of the optical fiber and incident on the light receiving element are measured, and the holding member is measured by an emitted light amount of the transmitted light from the optical fiber and the light receiving element. A method for assembling a two-way optical communication device, comprising: adjusting a position based on a reflected light amount of transmitted light to be fixed. 2. An optical fiber comprising: a light emitting element for transmitting transmission light to an optical fiber; and a light receiving element for receiving reception light emitted from the optical fiber, and both optical signals are bidirectionally transmitted and received by one optical fiber. An assembling method of the optical communication device, comprising: measuring an output light amount of transmission light emitted from the optical fiber, and a reflection light amount of transmission light reflected on an end face of the optical fiber and incident on the light receiving element, A method for assembling a bidirectional optical communication device, comprising: adjusting the position of the light emitting element to a position where the amount of emitted light is equal to or greater than a certain value and the amount of reflected light is equal to or less than a certain value. 3. The position adjustment of the light emitting element is performed by coarsely adjusting the position of the light emitting element at a position where the emitted light amount is equal to or more than a certain value, and then finely adjusting the position of the light emitting element at a position where the reflected light amount is equal to or less than a certain value. 3. The method for assembling a two-way optical communication device according to claim 2, wherein the method is performed. 4. A light-emitting element for transmitting transmission light to an optical fiber and a light-receiving element for receiving reception light emitted from the optical fiber, and both optical signals are transmitted and received bidirectionally by one optical fiber. An assembling method of the optical communication device, comprising: measuring an output light amount of transmission light emitted from the optical fiber, and a reflection light amount of transmission light reflected on an end face of the optical fiber and incident on the light receiving element, A method for assembling a bidirectional optical communication device, comprising: adjusting a position of the light emitting element to a position where a difference between the amount of emitted light and the amount of reflected light is equal to or more than a certain value, and fixing the position. 5. The bidirectional optical communication device according to claim 2, wherein the position of said light emitting element is adjusted in a plane orthogonal to the optical axis direction of said optical fiber. How to assemble. 6. A light-emitting element for transmitting transmission light to an optical fiber, and a light-receiving element for receiving reception light emitted from the optical fiber, and a bidirectional optical signal is transmitted and received by one optical fiber. A method for assembling a two-way optical communication device, comprising assembling a plurality of two-way optical communication devices, the two-way optical communication device being assembled at one end of an optical fiber by the above-described two-way optical communication device assembling method according to the present invention. A two-way optical communication device for arranging the two-way optical communication device to be assembled at the other end and disposing the two-way optical communication device assembled by the assembling method of the two-way optical communication device described above. A two-way optical signal is transmitted and received by said optical fiber to adjust the position of a light-emitting element and a light-receiving element of a two-way optical communication device to be assembled. . 7. A light-emitting element for transmitting transmission light to an optical fiber and a light-receiving element for receiving reception light emitted from the optical fiber, and both optical signals are bidirectionally transmitted and received by one optical fiber. In the optical communication device, the light receiving element functions as a reflected light measuring unit that measures a reflected light amount of transmission light from the end face of the optical fiber, and the light emitting element is orthogonal to at least an optical axis direction of the optical fiber. A holding member that movably holds the light in a plane, wherein the holding member adjusts a position based on a light amount of the transmitted light from the optical fiber and a reflected light amount of the transmitted light measured by the light receiving element. A two-way optical communication device, being fixed. 8. A receiving stem for supplying an operating bias to the light receiving element, and a transmitting stem for supplying an operating bias to the light emitting element, wherein the receiving stem and the transmitting stem are electrically separated. The two-way optical communication device according to claim 7, wherein: