JP3268700B2 - Optical coupling and branching module - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical coupling / branching module used in an optical fiber communication system.

[0002]

2. Description of the Related Art As one type of optical fiber communication, for example,
There is telephone communication. The equipment of each telephone subscriber is connected to the central office by an optical fiber or the like that functions as an optical line.
Telephone communication is performed through the optical fiber or the like. However, if any trouble such as disconnection occurs in an optical line such as an optical fiber connecting the central office and the telephone subscriber, telephone communication cannot be performed, so the central office manages this optical line. Therefore, an optical line monitoring system called an aurora is used.

FIG. 7 shows an example of this optical line monitoring system. In the figure, an optical fiber core 9b is connected to a transmitting / receiving device 1 on the telephone station side for transmitting and receiving an optical signal, and a single-core connector 2 is connected to the optical fiber core 9b. The optical fiber core wire 9c is connected to the single core connector 2. Optical fiber core wire 9c
Is held and fixed by a four-core optical fiber holding portion 3, for example, a transmitted light selection type four-core optical filter that transmits light of wavelength λ ₁ and does not transmit light of wavelength λ _2. 4 is connected. An optical fiber core 9 d is connected to the optical filter 4, and the optical fiber core 9 d
Is connected to a fiber type optical splitter / coupler 5 which joins and splits light.

An optical fiber core 9f is connected to each fiber type optical branching coupler 5, and the optical fiber core 9f is fixedly arranged on a four-fiber optical connector 6 functioning as an optical fiber disposing portion. The optical connector 6 is detachably connected to an optical connector (not shown) on the optical line side of the telephone subscriber. In a conventional telephone line, the optical connector on the optical line side of the telephone subscriber is a four-core optical connector. Since a connector is often used, a four-core optical connector 6 in which four optical fiber cores 9f are arranged corresponding to the optical connector is used for an optical line monitoring system. Optical fiber core wire 9f
When an optical signal from the optical transmission / reception device 1 is transmitted to the single-core connector 2, the optical fiber core retaining portion 3, the filter 4, and the fiber optical coupler 5 in that order, the signal is received. It plays a role of relaying and transmitting an optical signal to an optical line on the telephone subscriber side.

[0005] Also, optical fiber cores 9e and 9h are connected to each fiber type optical coupler 5, and the optical fiber cores 9e and 9h are connected to an 8-core optical connector 17, and an 8-core optical connector. 17 is, for example, OTDR (Optical Time Dom
ain Reflectmeter).

[0006] The optical monitoring device 20 is mainly composed of the optical fiber 9e.
The monitoring light is applied to the optical connector 6 via the optical connector 6 and the like, and the level of the light reflected and returned by the optical connector 6 is detected. It detects the presence or absence of an abnormality in a fiber, a device, or the like. For example, when monitoring light is applied to the optical connector 6 side,
The light enters each optical line of each telephone subscriber connected to the optical connector 6 and is reflected by each of the four optical lines and returns, but is reflected by one of the optical lines. If only the return light returned is extremely low compared to the return light when the test was performed in a normal state in advance, it is determined that there is something abnormal on the optical line side. This is a device for monitoring an optical line or the like on the optical connector 6 side.

The optical monitoring device 20 also monitors the optical transmission / reception device 1 side. When monitoring the optical transmission / reception device 1 side, the optical monitoring device 20 is connected to the optical transmission / reception device 1 via an optical fiber 9h or the like. The optical transmission / reception apparatus 1 can be monitored by adding light having the same wavelength as that of the signal light to the optical transmission / reception apparatus 1 and detecting the level of light reflected and returned on the optical transmission / reception apparatus 1 side. When light having the same wavelength as the signal light is transmitted from the optical monitoring device 20 in order to monitor the optical transmitting and receiving device 1, the signal light between the optical transmitting and receiving device 1 and the optical line side of the telephone subscriber is once transmitted. Transmission and reception are stopped.

The fiber type optical branching coupler 5 transmits the signal light transmitted from the optical transmitting / receiving device 1 through the optical fiber core 9 d via the single-core connector 2, the optical fiber core retaining portion 3, and the filter 4. When the light enters the optical fiber coupler 5, as shown in FIG. 8A, the signal light is sent to the optical fiber core 9f as shown by the arrow A in FIG. When the monitoring light transmitted from the optical monitoring device 20 enters the fiber type optical coupler / coupler 5 through the optical fiber core wire 9 e via the optical connector 17, the monitoring light is transmitted. As shown by arrow B in the figure.
The optical fiber is sent to the optical fiber core 9f side and sent to the optical connector 6 side. Thus, both the signal light from the optical transmitting and receiving device 1 and the monitoring light from the optical monitoring device 20 are sent to the optical connector 6 side. It works to send to.

As shown in FIG. 1B, the monitoring light sent to the optical connector 6 is reflected by an optical waveguide farther from the optical connector 6 and the light is transmitted through the optical fiber core 9f. When returning to the optical fiber coupler 5 through the optical fiber coupler 5, most of the return light is transmitted to the optical fiber core 9e and transmitted to the optical monitoring device 20 as shown by the arrow in the figure.

Further, as shown in FIG. 1C, the fiber type optical splitter / coupler 5 transmits the signal light from the optical line side of the telephone subscriber via the optical connector 6 to the optical fiber core 9.
f, and enters the fiber type optical coupler / coupler 5, the light is transmitted as shown by the arrow A in FIG.
To the optical transmitting / receiving device 1 side, and the light transmitted from the optical monitoring device 20 passes through the optical connector, passes through the optical fiber core 9h, and is transmitted to the fiber type optical coupler / coupler 5. When the light enters, as shown by the arrow B in the figure, the light is sent to the optical fiber core wire 9d side to send it to the optical transmitting / receiving device 1 side.
It serves to send both the signal light from the side and the light from the optical monitoring device 20 to each optical transmitting / receiving device 1 side.

As shown in FIG. 1D, when the light transmitted to the optical transmitting / receiving device 1 is reflected by the optical transmitting / receiving device 1 and returns, most of the returned light is reflected in the drawing. As shown by the arrow, it is sent to the optical fiber core 9h side, and the optical monitoring device
It works to send to the 20 side.

As shown in FIG. 7, an optical coupling / branching module 8 is composed of the optical fiber core retaining portion 3, the filter 4, and the fiber type optical branching coupler 5.

The conventional optical line monitoring system is configured as described above. When a signal light having a wavelength of λ ₁ is transmitted from the optical transceiver 1 and enters the optical coupling / branching module 8, the light is transmitted as shown in FIG. As shown by the arrow A in (a), the signal is sent to the optical connector 6 side by the fiber type optical branching coupler 5 and sent to the optical line of the telephone subscriber, and conversely, from the optical line side of the telephone subscriber. When the signal light having the wavelength λ ₁ is transmitted, the light is transmitted to the optical transmitting / receiving device 1 by the fiber type optical coupler 5 as shown by the arrow A in FIG. As shown in FIG.
The telephone communication is performed by transmitting and receiving between the optical transmitting and receiving device 1 on the telephone station side and the telephone subscriber via the telephone.

Also, for example, the wavelength λ ₂
When the monitor light of FIG.
(A), the light is transmitted to the optical connector 6 side by the fiber type optical branching coupler 5, transmitted to the optical line side of the telephone subscriber, and further transmitted to the telephone subscriber side. The monitoring light thus reflected is reflected on the optical line side, and returns to the optical monitoring device 20 side through the fiber type optical coupler 5 as shown in FIG. Therefore, by detecting the return light by the optical monitoring device 20, it is possible to determine whether or not there is an abnormality on the optical line side of the telephone subscriber. It is assumed that, when return light having the wavelength λ ₂ passes through the fiber-type optical coupler / coupler 5, a part of the light leaks in the fiber-type optical coupler / coupler 5 and enters the optical fiber core wire 9 d side. The light has a wavelength λ ₂
Is blocked by the filter 4 which does not transmit the light of
The signal is not transmitted to the optical transmitting / receiving apparatus 1 side, and transmission / reception of the signal light between the optical transmitting / receiving apparatus 1 and the telephone subscriber is not hindered.

When monitoring the optical transmitting and receiving apparatus 1, transmission of signal light from the optical transmitting and receiving apparatus 1 and the optical line side of the telephone subscriber is temporarily stopped, and the same wavelength λ as the signal light is transmitted from the optical monitoring apparatus 20 to the optical monitoring apparatus 20. _When the light of _{No. 1} is made incident on the optical coupling / branching module 8, the light is reflected as shown by an arrow B in FIG.
The light is transmitted to the optical transmitting / receiving device 1 by the fiber type optical coupler / coupler 5, reflected by the optical transmitting / receiving device 1 side, and passed through the fiber type optical coupler / coupler 5 as shown in FIG. 2
It returns to the 0 side. Therefore, the return light is transmitted to the light monitoring device 2
By detecting with 0, it is possible to determine the presence or absence of an abnormality on the optical transmitting and receiving apparatus 1 side. The optical fiber 9d
When only monitoring is performed, it is also possible to make the light of wavelength λ ₂ incident on the optical multiplexing / branching module 8 and to detect the return light in the same manner.

[0016]

However, in the conventional optical line monitoring system, as shown in FIG.
In order for the optical coupling / branching module 8 to mediate the four optical transmitting / receiving devices 1 and the four-fiber optical connector 6, it is necessary to provide four fiber-type optical branching / coupling couplers 5 in the module 8. When a plurality of fiber-type branch couplers 5 are manufactured in the same number as the number of optical fibers provided in the optical connector 6, and the fiber-type branch couplers 5 are disposed in the optical coupling / branching module 8, it takes much time and costs. There was a problem that it became expensive.

In order to solve the problem, an attempt is made to manufacture an optical component in which the four fiber type optical branching couplers 5 are collectively manufactured. However, such a multi-fiber bundled type fiber type optical branching coupler is manufactured. Doing so is technically very difficult and difficult to manufacture. Therefore, as shown in FIG. 5, the present applicant monolithically forms a pattern of four branch coupler waveguides 7 that function in the same manner as the fiber branch coupler, instead of the fiber optical branch coupler 5. Multiplexing / branching module 8 provided with selected multiplexing / branching / coupling waveguide chip 10
And tried to use it for an optical line monitoring system.

However, in the case of the optical line monitoring system using the optical coupling / branching module 8 as shown in FIG.
In order to connect one optical connector 6 and one optical coupling / branching module 8, for example, two optical connectors 6 and FIG.
When connecting to the optical coupling / branching module 8, two optical coupling / branching modules 8 must be manufactured and connected to the two optical connectors 6 as shown in FIG. 6. In fact, the telephone line connecting the central office and the telephone subscriber is very large, and uses a large number of optical connectors 6. Thus, the number of optical connectors 6 is equal to the number of optical connectors 6. It was difficult to make the modules 8 individually and apply them to telephone lines that formed a large network.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical multiplexing / branching module suitable for an optical fiber communication system of a large network such as a telephone line.

[0020]

In order to achieve the above object, the present invention is configured as follows. That is, the present invention provides a plurality of optical transmission / reception devices for transmitting / receiving optical signals;
A multi-core optical fiber arranging section in which a plurality of optical fibers for receiving an optical signal from the optical transmitting and receiving apparatus and relaying and transmitting the optical signal are arranged; and the optical fiber arranging section side and the optical transmitting and receiving apparatus side .
Added individually monitored optical fiber arranging portion side and the light receiving instrumentation
An optical monitoring device for detecting the presence or absence of an abnormality on the installation side; and an optical branching module connected to the optical monitoring device for detecting signal light from the optical transmitting and receiving device and the optical fiber distribution from the optical monitoring device.
Monitoring light to the portion side sends to the optical fiber arranging portion side, also,
Signal light from the optical fiber installation side and light transmission from the optical monitoring device
The monitoring light to the receiving device is sent to the optical transmitting and receiving device, and
To, come light off the back reflected by the optical fiber arranging portion side
Return light of the monitoring light on the fiber arranging unit side and the optical transmitting / receiving device side
The return light reflected by the optical transmitting and receiving device side is provided with an optical branching / coupling waveguide pattern to be sent to the optical monitoring device side, while the optical multiplexing / branching module is connected to two or more optical fiber disposing sections. And the optical branching / coupling waveguide pattern is
It is characterized in that it is constituted by a waveguide chip in which a plurality of patterns of the same number as the total number of optical fibers provided in all the optical fiber provided portions are collectively formed.

In the waveguide chip, the monitoring light to the optical transmitting / receiving device is transmitted to the side connected to the optical transmitting / receiving device, and the optical fiber is connected to the optical fiber.
The filter monitoring beam is not transmitted to Aiba arranging portion side is provided has also been a characteristic structure of the present invention.

[0022]

In the present invention having the above structure, the optical coupling / branching module is connected to two or more optical fiber arranging portions, and the number of the optical branching / coupling waveguide patterns is equal to the number of optical fibers arranging in the optical fiber arranging portion. Since a plurality of patterns are collectively formed, the plurality of optical fibers disposed in two or more optical fiber disposing sections are optically coupled by the waveguide chip of one optical coupling / branching module. It becomes possible to connect to a transmitting / receiving device or an optical monitoring device. For this reason, for example, a plurality of fiber type optical branching couplers are provided in the optical coupling / branching module for each optical fiber connected to the optical line of the telephone subscriber, or the optical coupling / branching is performed for each optical fiber disposing unit. Compared to the case where an optical branching module having a waveguide is provided or one optical coupling / branching module is connected to one optical fiber disposing unit, one optical fiber disposing unit or one optical fiber It is possible to reduce the cost of manufacturing the optical coupling / branching module and the like, and the construction cost of the entire system in an optical fiber communication system of a large network such as a telephone line is reduced.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same symbols are assigned to the same parts as in the conventional example, and the detailed description thereof is omitted.
FIG. 1 shows an optical line monitoring system including a first embodiment of the optical coupling / branching module according to the present invention. The main difference between this embodiment and the conventional optical line monitoring system or the optical line monitoring system shown in FIGS. 5 and 6 is that one optical coupling / branching module 8 is connected to two optical connectors 6. That is, a waveguide chip 10 in which the same number as the total number of optical fiber core wires 9f provided in the optical connector 6, that is, the pattern of eight optical branching and coupling waveguides 7 is collectively formed.

Each light branching / coupling waveguide 7 of the waveguide chip 10
Functions in the same manner as the conventional fiber type optical coupler / coupler 5, and is connected to the optical transmitting / receiving apparatus 1 via the optical fiber core 9d, the filter 4, and the like. Each of the optical branching / coupling waveguides 7 is connected to the optical connector 6 by an optical fiber core 9f.
9 h , the optical monitoring device 20 is connected to the 16-fiber optical connector 17 and to the optical monitoring device 20 via the optical connector 17.

As shown in FIG. 2, the waveguide chip 10 is a quartz-based waveguide chip having a core 23 and claddings 21 and 22 formed on a silicon substrate 19 having a thickness of 1 mm by a flame deposition method and dry etching. Above the lower cladding 21 of 25 μm thick SiO ₂ (quartz),
_An 8 μm-thick core 23 made of ₂ (titanium oxide) is deposited and dry-etched to form a core 23 as shown in FIG.
As shown in FIG. 2, an upper cladding 22 similar to the lower cladding 21 is formed above the core 23 as shown in FIG.
The core 23 has a refractive index 0.25% higher than the claddings 21 and 22, and the waveguide chip 10 has a length of 25 mm and a width of 6 mm.

The optical monitoring system provided with the optical multiplexing / branching module 8 of the present embodiment operates in the same manner as the conventional example, whereby
From the optical transceiver 1, for example, the wavelength lambda ₁ of the signal light,
The signal is transmitted from the optical connector 6 side to each telephone subscriber via the optical branch coupling waveguide 7 of the waveguide chip 10 of the optical coupling / branching module 8, and similarly, the signal light from the telephone subscriber is transmitted to the waveguide chip. The data is transmitted to the optical transmitting and receiving apparatus 1 via the telephone 10, and telephone communication is performed.

The monitoring light of, for example, the wavelength λ ₂ transmitted from the optical monitoring device 20 to the optical fiber 9 e is transmitted via the optical branching coupling waveguide 7 of the waveguide chip 10 of the optical coupling / branching module 8. The light sent from the optical connector 6 to each telephone subscriber side and reflected on the optical line side of the telephone subscriber returns to the optical monitoring device 20 via the optical branching coupling waveguide 7 of the waveguide chip 10 and returns there. Light is detected by the light monitoring device 20, and monitoring of the optical line is performed.

Further, in order to confirm the presence or absence of an abnormality in the optical transmitting / receiving apparatus 1, the transmission / reception of signal light between the optical transmitting / receiving apparatus 1 and the optical line side of the telephone subscriber is temporarily stopped.
When the light having the same wavelength λ ₁ as the signal light is transmitted from the optical monitoring device 20 to the optical fiber 9 h, the light is transmitted to the waveguide chip 10.
Is transmitted to each optical transmission / reception device 1 via the optical branching / coupling waveguide 7 and reflected on the optical transmission / reception device 1 side.
The light returns to the optical monitoring device 20 via the ten optical branching / coupling waveguides 7, and the returned light is detected by the optical monitoring device 20, and the optical transmission / reception device 1 is monitored.

Then, the optical coupling / branching module 8 of this embodiment
Are connected to two optical connectors 6, and a waveguide chip 10 of the optical coupling / branching module 8 is provided with eight patterns of optical branch / coupled waveguides 7.
Through eight optical fiber cores 9f arranged in
Connected to the optical line on the telephone subscriber side of the book, while 8
Since the optical transmission / reception device 1 is connected to one optical transmission / reception device 1, it is possible for one optical coupling / branching module 8 to collectively mediate twice the optical line of the telephone subscriber and the double optical transmission / reception device 1 as compared with the conventional example. In addition, similarly, one optical coupling / branching module 8 can monitor twice as many telephone subscribers and optical lines on the optical transmitting / receiving apparatus 1 side as those in the conventional example.

Therefore, when the system shown in FIG. 1 is applied to a telephone line forming a large circuit network, it is sufficient to provide half the number of optical coupling / branching modules 8 when applying the conventional system. Optical connectors 6, or
The manufacturing cost of the optical coupling / branching module 8 per optical fiber can be reduced, and the construction cost of the entire system in the optical fiber communication system can be reduced.

FIG. 3 shows an optical line monitoring system using a second embodiment of the optical coupling / branching module of the present invention. The main point of the second embodiment different from the first embodiment is that, for example, the filter 4 that does not transmit the monitoring light of the wavelength λ ₂ is connected to the optical transceiver unit 1 in the waveguide chip 10, that is, This is provided on the side 13 of the optical coupling / branching coupling waveguide 7 connected to the optical fiber core wire 9c. As shown in FIG. 4, the filter 4 is formed of a dielectric multilayer film having a thickness of 8 μm, and is disposed and fixed on a glass plate 14 having a thickness of 12 μm with an interval therebetween. The filter 4 is a conventional example and a first example.
And a filter plate 15 composed of a glass plate 14 and the filter 4.
Has a length of 4.5 mm and a width of 200 μm. The second embodiment operates in the same manner as the first embodiment, and can achieve the same effects.

Further, in the second embodiment, since the filter 4 which does not transmit the monitoring light is provided on the connection side of the waveguide chip 10 with the optical transmitting / receiving device 1, for example, the optical line side of the telephone subscriber can be used. A part of the return light of the wavelength λ ₂ reflected by the optical fiber 9c leaks at the center side of the optical branching / coupling waveguide 7, and the optical fiber core 9c
Even if the light is sent to the side 13 connected to the optical fiber, the light is not blocked by the filter 4 and sent to the optical fiber core 9c outside the waveguide chip 10 at all.

By providing the filter 4 in the waveguide chip 10 as described above, the optical coupling / branching module 8
Can be constituted by the two optical components of the optical fiber core retaining portion 3 and the waveguide chip 10, and the optical fiber 9c and the waveguide chip 10 can be directly connected.
The number of connection points between the optical components in the optical coupling / branching module 8 can be reduced, and the fabrication of the optical coupling / branching module 8 can be simplified. Then, the cost of the optical coupling / branching module 8 can be further reduced.

Note that the present invention is not limited to the above-described embodiment, but can adopt various embodiments. For example, in the above embodiment, the optical fiber core retaining part 3 is an eight-core optical fiber core retaining part for fixing the eight optical fiber cores 9c, but, for example, four optical fiber cores 9c are used. It is possible to provide two four-fiber optical fiber cord retaining portions to be fixed. Similarly, the filter 4 is also provided as in the above-described embodiment.
The filter is not necessarily an eight-core batch filter, and two four-core batch filters may be provided. Similarly, an optical connector for connecting the optical monitoring device 20 connected to the optical coupling / branching module 8.
17 is not limited to a 16-fiber-corresponding optical connector as in the above embodiment, and two 8-fiber-corresponding optical connectors may be provided.

As described above, the optical fiber core retaining portion 3, the filter 4, and the optical connector 17 are not necessarily provided one by one in one component of the optical monitoring system as shown in FIGS. Alternatively, two or more may be provided.

The optical coupling / branching module 8 of the above embodiment
Has a waveguide chip 10 which is connected to two four-core optical connectors 6 and collectively forms eight optical branching / coupling waveguide 7 patterns to constitute an optical coupling / branching module. The four connectors are not necessarily connected to the four-fiber optical connector 6, and the number of connectors 6 to be connected may be two or more. For example, the optical coupling / branching module 8 is divided into four 4
The optical fiber connector 6 may be connected to the optical fiber connector 6. In this case, 16 patterns of the optical branching / coupling waveguides 7 are collectively formed on the waveguide chip 10.

Further, in the above embodiment, the optical connector 6 for connecting to the optical line of the telephone subscriber is a four-fiber optical connector so as to be easily applied to a conventional telephone line. However, the present invention is not limited to this, and an eight-fiber optical connector may be used, or an optical connector in which other numbers of optical fibers are arranged may be used.

Further, in the second embodiment, the filter plate 15 is formed by the filter 4 and the glass plate 14, and the filter plate 15 is incorporated in the waveguide chip 10. However, the filter plate 15 is not always provided. , Only the filter 4 may be provided on the side of the optical branching and coupling waveguide 7 connected to the optical fiber 9c. However, when the filter plate 15 is formed and incorporated into the waveguide chip 10, the operation of providing the filter 4 on the waveguide chip 10 is more complicated than disposing the filter 4 alone in the waveguide chip 10 with an interval. Easy to do.

In each of the above embodiments, the filter 4 is provided in the optical coupling / branching module 8. However, the filter 4 is not always provided in the optical coupling / branching module 8. May be provided on the side of the optical transmitting and receiving device 1 outside the optical transmission line, or the optical line monitoring system may be configured without the filter 4.

Further, the optical coupling / branching module 8 of the present invention
Is not always used in a telephone line as in the above embodiment, but is also applied to other optical fiber communication systems.

[0041]

According to the present invention, the wavelength division module is connected to two or more optical fiber arranging portion, the light branching and coupling waveguide pattern is the sum of all optical fiber arranging portion <br / > Since it is composed of a waveguide chip in which a plurality of patterns of the same number as the number of optical fibers are collectively formed, the same number as the number of optical fibers arranged in one optical fiber Fabricate fiber type optical branching coupler individually,
A plurality of optical branching couplers are provided in the optical coupling / branching module,
It is possible to reduce the cost of producing an optical coupling / branching module per optical fiber disposing unit or one optical fiber as compared with a case where one optical fiber disposing unit and one optical coupling / branching module are connected. Become.

Therefore, when the optical multiplexing / branching module of the present invention is used in an optical fiber communication system of a large circuit network such as a telephone line, the construction cost of the entire system is lower than when using the conventional optical multiplexing / branching module. can do.

Further , according to the present invention, an optical fiber connecting portion
Monitoring light by sending monitoring light to the optical transceiver
So that optical fiber connection with the optical transceiver
Has the epoch-making effect of being able to monitor both sides of the
can do. Further, on the side of the waveguide chip connected to the optical transmitting / receiving device, the monitoring light to the optical transmitting / receiving device is transmitted and transmitted.
According monitor light to the fiber placement portion side in the wavelength division module having a filter that does not transmit light off from the optical monitoring device
In order to completely prevent the monitoring light to the fiber installation part side from being blocked by the filter and reaching the optical transmitting and receiving device side,
It is possible to completely prevent the transmission of the signal light between the optical transmitting / receiving device side and the optical fiber arranging unit side such as the optical line of the telephone subscriber from being disturbed by the monitoring light.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an optical line monitoring system using a first embodiment of an optical coupling / branching module according to the present invention.

FIG. 2 is an explanatory diagram showing the waveguide chip 10 of FIG.

FIG. 3 is a configuration diagram showing an optical line monitoring system using a second embodiment of the optical coupling / branching module of the present invention.

FIG. 4 is an explanatory view showing a filter plate 15 constituted by the filter 4 and the glass plate 14 of FIG.

FIG. 5 is an explanatory diagram showing an example of an optical line monitoring system using an optical coupling / branching module having a waveguide chip 10 prototyped by the applicant;

6 is an explanatory diagram showing an optical line monitoring system in which the optical coupling / branching module 8 of FIG. 5 is connected to two optical connectors 6 one by one.

FIG. 7 is an explanatory diagram showing an optical line monitoring system using a conventional optical coupling / branching module.

FIG. 8 is an explanatory diagram showing an operation of the fiber type optical branching coupler of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical transmission / reception apparatus 4 Filter 6 core connector 7 Optical branching coupling waveguide 8 Optical coupling / branching module 9 Core fiber core 10 Waveguide chip

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ken Ueki 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (72) Inventor Nobuo Tomita 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Inside Telegraph and Telephone Corporation (56) References JP-A-5-196543 (JP, A) Taisuke Oguchi, Waveguide type coupler with built-in filter, Proceedings of IEICE Conference, Japan, IEICE, VOL. 1993, NO. Shuki, PAGE. 4-241 Nobuo Tomita, AURORA Supporting Optical Line Network Testing and Management, NTT Technical Journal, Japan, October 1, 1991, Vol. 3, No. 10, p. 18-20 (58) Field surveyed (Int. Cl. ⁷ , DB name) H04B 10/00-10/28 H04J 14/00-14/08

Claims (2)

(57) [Claims] 1. A multi-core optical fiber arranging section, comprising: a plurality of optical transmitting / receiving apparatuses for transmitting / receiving optical signals; and a plurality of optical fibers for receiving and transmitting optical signals from the optical transmitting / receiving apparatuses. And the optical fiber disposing unit side and the optical transceiver
Added individually monitored light into a side feed optical fiber arranging portion side and the light
An optical monitoring apparatus for detecting the presence or absence of the receiving apparatus abnormality; an optical branching modules connected to, fiber-from the signal light and the optical monitoring device from the light branching module optical transceiver
Monitoring light to the driver placement portion side sends to the optical fiber arranging portion side,
In addition, signal light from the optical fiber
Monitoring light to Hikari Luo transceiver side sends to the optical transceiver side,
Further, the light is reflected and returned on the optical fiber disposing portion side.
Return light of the monitoring light on the optical fiber disposing unit side and the optical transmitting / receiving device
The return light of the optical transmitting / receiving device reflected and returned on the device side is provided with an optical branching / coupling waveguide pattern to be sent to the optical monitoring device side, while the optical coupling / branching module is provided with two or more optical fiber disposing units. And the optical branching / coupling waveguide pattern is constituted by a waveguide chip in which a plurality of patterns of the same number as the total number of optical fibers provided in all the optical fiber provided portions are collectively formed. Optical coupling and branching module. 2. A monitoring chip for transmitting an optical fiber through a waveguide chip to a side connected to the optical transmitter and receiver.
Wavelength division module according to claim 1, wherein the filter monitor light to the portion side is not transmitted is provided.