JP3322234B2 - Optical fiber connection device and connection method thereof - 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 fiber connection device, and more particularly, to an IEEE 802.3z 1000BAS.
The present invention relates to a device for connecting an optical fiber of E-LX specification.

[0002]

2. Description of the Related Art IEEE 802.3z used in the present invention.
Is a high-speed LAN (Local A) that realizes 1 Gbps
area standard, which uses short wavelength light as an optical interface.
1000BASE using ASE-SX and long wavelength light
-There are two specifications of LX.

In the case of short-wavelength light, components such as a light source, a light-receiving element, and a fiber cable can be inexpensively controlled, but the transmission distance is limited due to a large amount of light attenuation in those devices. On the other hand, in the case of long-wavelength light, components are expensive, but the amount of attenuation in those devices is small, so that the transmission possible distance is long.
In recent years, in general, when constructing a LAN, the purpose is often to increase the bandwidth capacity, increase the speed, and extend the distance of an existing network. Particularly in the case of a large-scale network, the construction cost for laying fiber cables and the like is enormous. Because
In many cases, existing facilities are diverted. Or, conversely, taking into account future expandability, measures have been taken to lay out the equipment that will be needed in advance, and then change only the equipment and introduce new technology.

[0004] In 1000BASE-LX, a laser is used as a light source at the time of transmission. Therefore, when a multi-mode fiber is used as a transmission path, there are a plurality of different paths of laser light propagating in the fiber, and different paths have different propagation paths. Because of the delay time, a plurality of signals arrive at the receiving device with different delay times.
lay. A phenomenon called DMD) occurs. This D
If the MD becomes large, the receiver cannot correctly demodulate the signal.

[0005] To solve this problem, 1
In the 000BASE-LX, for example, by attaching a patch cord having a fiber center matching section outside the transmitter, the fiber center matching section always irradiates a laser beam to a place distant from the center of the multi-fiber mode. DMD is less likely to occur. A multimode fiber provided with a mechanism for reducing the DMD is called a mode condition patch cord.

The configuration of the conventional 1000BASE-LX optical fiber connecting device in FIG. 5 will be described with reference to FIG. In this specification, the same or equivalent components are denoted by the same reference numerals. In the conventional optical fiber connection device, a multimode fiber 7 is connected to an output terminal of a transmitter 1, and a fiber center matching unit 5 is connected to a terminal of the multimode fiber 7 different from the terminal of the transmitter 1. A single mode fiber 4 is connected to the center matching section 5, and a multimode fiber 8 is connected to a terminal of the single mode fiber 4 which is different from the terminal of the fiber center matching section 5. Connect the receiver to the terminal 4 and another terminal. As a result, the signal transmitted from the transmitter 1 is transmitted to the multimode fiber 7, the signal passes through the fiber center matching unit 5, and the signal is transmitted to the single mode fiber 4. Can be reduced.

[0007]

However, this mode condition patch cord can surely reduce the DMD when a multi-mode fiber is used as a signal transmission line at 1000 BASE-LX. Since the transmission characteristics are different from the above, the 1000BASE-SX is a specification that can use a multimode fiber,
The SX has a disadvantage that the above-mentioned mode condition patch cord cannot be applied, and there is a problem in flexibility in terms of applicability of equipment.

[0008] In view of the problems in the prior art described above, the present invention provides a 1000BASE-LX and a 1000BASE-S.
It is an object of the present invention to provide an optical fiber connection device and a connection method that can be used immediately without any new construction, regardless of the communication standard of X.

[0009]

An optical fiber connection device according to a first invention of the present application which solves the above-mentioned problems is an IEEE80-80.
In an optical fiber connection device having a multimode fiber and a single mode fiber of 2.3z1000BASE-LX specification, a multimode fiber having one end connected to a transmitter and a multimode fiber connected to the transmitter of the multimode fiber are connected. The other end is connected to a multi-mode fiber and a single-mode fiber connected in parallel with each other, and the other end is connected to a transmitter. Is connected to the receiver, and another end of the multimode fiber connected to the receiver is connected to the bypass of the multimode fiber and the single mode fiber connected in parallel to each other. Another bypass end connecting to the other end different from the end connected to the bypass portion In the bypass section connected to both ends of the multimode fiber and the single mode fiber connected in parallel with each other, it is determined whether the multimode fiber or the single mode fiber connected in parallel with each other is used. And a selection setting section for selecting and setting.

Therefore, according to the optical fiber connecting device of the first invention of the present application, the multimode fiber having one end connected to the transmitter and the multimode fiber connected to the transmitter are separated from each other. At one end, a bypass unit for connecting a multimode fiber and a single mode fiber connected in parallel to each other, and another end, connected to the receiver, different from the multimode fiber, one end of which is connected to a transmitter. The other end of the multimode fiber that is connected to the receiver and the other end of the multimode fiber that is connected to the receiver are connected to the multimode fiber connected in parallel with the bypass portion of the single mode fiber. And a bypass section separate from the bypass section connecting the other end to the multi-mode fiber connected in parallel with each other. A selection setting unit configured to select and set whether to use the multi-mode fiber or the single mode fiber connected in parallel with each other, in the bypass unit connected to both ends of the single-mode fiber. With this configuration, the selection setting unit can determine whether the signal transmitted from the transmitter is a communication standard of 1000BASE-LX or a communication standard of 1000BASE-SX. That is, when the signal transmitted from the transmitter is 1000BASE-LX, the signal transmitted from the transmitter is transmitted to the single mode fiber by the bypass unit, and when the signal transmitted from the transmitter is 1000BASE-SX, The signal transmitted from the transmitter can be transmitted to the multimode fiber by the bypass unit. As a result, 1000BASE-
If the signal is an LX communication standard signal, the transmission path can have the same characteristics as the conventional mode condition patch cord. If the signal is a 1000BASE-SX communication standard signal, the signal passes through the fiber center matching unit It is not necessary to do so, and the transmission path can be provided with characteristics conforming to the communication standard of 1000BASE-SX. Therefore,
Regardless of the communication standards of 1000BASE-LX and 1000BASE-SX, it is possible to provide an optical fiber connection device that can be used immediately without requiring new work.

According to a second aspect of the present invention, there is provided the optical fiber connection device according to the first aspect of the present invention, wherein the multi-mode fiber is connected to another end of the multi-mode fiber which is connected to the transmitter. Installed between the bypass unit and the transmitter, and connected to the transmitter with the multimode fiber, connected to the bypass unit,
A wavelength detecting unit for detecting the wavelength of the signal transmitted to the multimode fiber and transmitting information on the wavelength of the signal to the selection setting unit.

Therefore, according to the optical fiber connection device of the second invention of the present application, the multi-mode fiber is installed at another end different from the end connected to the transmitter so as to be connected to the multi-mode fiber. It is installed between a bypass unit and the transmitter, is connected to the transmitter by the multi-mode fiber, is connected to the bypass unit, detects the wavelength of the signal transmitted to the multi-mode fiber, and detects the wavelength of the signal. Is provided with a wavelength detection unit that transmits information about the wavelength to the selection setting unit. Based on the information regarding the wavelength, the selection setting unit determines whether the signal transmitted from the transmitter to the multimode fiber is a 1000BASE-LX communication standard signal. Or, if it is identified as a 1000BASE-SX communication standard signal, and if it is identified as a 1000BASE-LX communication standard signal, The mode condition patch code and the same characteristics of come to have in the transmission path, 1000BASE
-If the signal is identified as an SX communication standard signal, the signal does not need to pass through the fiber center matching unit,
The transmission path can be provided with characteristics conforming to the E-SX communication standard.

According to a third invention of the present application, in the optical fiber connection device according to the second invention of the present application, the wavelength detecting section includes a specific wavelength having a long wavelength or a short wavelength transmitted to the multimode fiber. And a wavelength detector that detects the amount of light of the signal after the signal has passed through the specific wavelength transmitter.

Therefore, according to the optical fiber connection device of the third invention of the present application, the wavelength detector transmits only a signal of a specific wavelength having a long wavelength or a short wavelength transmitted to the multimode fiber. A signal transmitted from the transmitter to the multimode fiber by having a specific wavelength transmitting portion for transmitting the signal and a wavelength detecting portion for detecting a light amount of the signal after the signal passes through the specific wavelength transmitting portion. Of 100
0BASE-LX communication standard signal or 1000BASE
The selection setting unit can recognize only one of the -SX communication standard signals. Here, the specific wavelength is
It is the wavelength of the communication standard signal of 1000BASE-LX or 1000BASE-SX.
The wavelength of the LX communication standard signal is longer than the wavelength of the 1000 BASE-SX communication standard signal, and the wavelength of the 1000 BASE-LX communication standard signal is 1310 nm.
The wavelength of the SE-SX communication standard signal is 850 nm.

According to a fourth invention of the present application, in the optical fiber connection device of the second invention of the present application, the multimode fiber is connected to another end of the multimode fiber which is connected to the transmitter. And a power detector for detecting an output value of a signal transmitted to the multi-mode fiber and transmitting information on the output value of the signal to the selection setting unit.

Therefore, according to the optical fiber connecting device of the fourth invention of the present application, the optical fiber connecting device is installed at one end different from the end connected to the transmitter of the multimode fiber so as to be connected to the multimode fiber. , A power detector for detecting an output value of a signal transmitted to a multimode fiber and transmitting information on the output value of the signal to a selection setting unit.
Utilizing the property of the communication standard signal that 000BASE-LX has higher output power, the signal transmitted from the transmitter to the multimode fiber is 1000BASE-LX.
Or a communication standard signal of 1000BASE-SX.

According to a fifth aspect of the present invention, in the optical fiber connection device according to the first aspect of the present invention, the single-mode fiber is installed at an end far from a transmitter on a single-mode fiber connected to the bypass unit. A power detection unit detects an output value of a transmitted signal and transmits information on the output value of the signal to the selection setting unit.

Therefore, according to the optical fiber connection device of the fifth invention of the present application, the output of the signal transmitted to the single mode fiber is installed at the end far from the transmitter on the single mode fiber connected to the bypass unit. By providing a power detection unit for detecting the value and transmitting information on the output value of the signal to the selection setting unit, the magnitude of the output value of the signal transmitted to the single mode fiber is reduced to 1
Utilizing the property of the communication standard signal that 1000BASE-LX is larger than 000BASE-SX, the signal transmitted from the transmitter to the multimode fiber is 1000
BASE-LX communication standard signal or 1000B
It becomes possible to identify whether the signal is an ASE-SX communication standard signal.

An optical fiber connecting method according to a sixth aspect of the present invention is an optical fiber connecting method having a multimode fiber and a single mode fiber of IEEE802.3z 1000BASE-LX specification, wherein the multimode fiber and the single mode fiber are connected in parallel with each other. A selection setting for connecting a multimode fiber and a single mode fiber via a bypass section, and selecting and setting whether to use a multimode fiber or a single mode fiber connected in parallel to each other in the bypass section. Connecting the parts.

Therefore, according to the optical fiber connecting method of the sixth aspect of the present invention, the multimode fiber and the multimode fiber and the single mode fiber connected in parallel with each other are connected via the bypass section, By connecting to the bypass unit a selection setting unit that selects and sets whether to use a multi-mode fiber or a single-mode fiber connected in parallel with each other, the signal transmitted from the transmitter is 1000BASE-LX. The selection setting unit can select whether the communication standard or the 1000BASE-SX communication standard is used.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical fiber connecting apparatus and a connecting method according to an embodiment of the present invention will be described below with reference to FIGS.

First Embodiment A configuration of an optical fiber connection device according to a first embodiment of the present invention will be described with reference to FIG. A multimode fiber 7 is connected to an output terminal of the transmitter 1, and a bypass section 6 is provided at another end of the multimode fiber 7 which is connected to the transmitter 1. A multi-mode fiber 3 and a single-mode fiber 4 are connected to the bypass section 6 in parallel with each other. The other end of each fiber connected to the bypass section 6 is provided with a bypass section 6 separate from the bypass section 6. A multimode fiber 8 separate from the two multimode fibers is connected to the bypass section 6.
The receiver 2 is connected to another end of the multimode fiber 8 which is connected to the bypass section 6. Also, D
A fiber center matching unit 5 for performing MD compensation is connected to an end of the single mode fiber 4 near the transmitter 1 and the single mode fiber 4 and a bypass unit 6 near the transmitter 1. Further, the two bypass units 6 are connected to the selection setting unit 9.

Next, the operation of the optical fiber connection device and the connection method according to the first embodiment of the present invention will be described with reference to FIG. The signal transmitted from the transmitter 1 is 100
0BASE-LX communication standard signal or 1000
The user determines whether the signal is a BASE-SX communication standard signal, and the bypass unit 6 transmits the signal transmitted from the transmitter 1 to the multimode fiber 3 by switching a switch or the like of the selection setting unit 9 by the user. Or transmission to the single mode fiber 4 is set. Transmission signal is 1000
If the signal is a BASE-LX communication standard signal, the transmission signal passes through the fiber center matching unit 5 and the single mode fiber 4 as in the prior art, and the transmission signal is 1000 B
If the signal is an ASE-SX communication standard signal, the transmission signal is set to pass through the multimode fiber 3. In other words, if the transmission signal is a 1000BASE-LX communication standard signal, it is necessary to have the same characteristics as the conventional mode condition patch cord of FIG. An instruction signal for selecting a delay compensation route is transmitted, and upon receiving this signal, the bypass unit 6 establishes a connection with the fiber center matching unit 5 and the single mode fiber 4 and disconnects the connection with the multimode fiber 3. If the transmission signal is a 1000BASE-SX communication standard signal, the selection setting unit 9 transmits an instruction signal for selecting the multi-mode fiber 3 to the bypass unit 6, and the bypass unit 6 receiving this signal transmits the multi-mode fiber 3. The connection with the mode fiber 3 is established, and the connection with the fiber center matching unit 5 and the single mode fiber 4 is disconnected. Thus, the connected transmitter 1 and receiver 2 are of the 1000BASE-LX specification or not.
Configurator will be given the freedom to set a connection route according to the 000BASE-SX specification.
The communication can be performed between the transmitter 1 and the receiver 2 by any of the communication standards of 000BASE-LX and 1000BASE-SX.

According to the optical fiber connection device and the connection method thereof according to the first embodiment of the present invention, the multimode fiber 7 having one end connected to the transmitter 1, the multimode fiber 7 and the multimode fiber The other end of the mode fiber 7 connected to the transmitter 1 is connected to a bypass unit 6 for connecting the multimode fiber 3 and the single mode fiber 4 connected in parallel with each other. A multimode fiber 8, one end of which is connected to the receiver 2, different from the multimode fiber connected to
The other end of the multimode fiber 8 connected to the receiver 2 is connected to the other end of the multimode fiber 3 connected in parallel with the bypass unit 6 of the single mode fiber 4. And a bypass section 6 connected to the other end of the multi-mode fiber 3 and a single-mode fiber 4 connected in parallel with each other. The transmission unit 1 includes a selection setting unit 9 for selecting and setting which of the multi-mode fiber 3 and the single-mode fiber 4 is used in the unit 6. Is transmitted according to the communication standard of 1000BASE-LX or 10
00BASE-SX communication standard selection / setting section 9
Can be sorted out. Therefore, 1000B
Regardless of the communication standards of ASE-LX and 1000BASE-SX, it is possible to provide an optical fiber connection device that can be used immediately without requiring new work.

Second Embodiment A configuration of an optical fiber connection device according to a second embodiment of the present invention will be described with reference to FIG. The wavelength detection unit 12
The other end of the multimode fiber 7 which is connected to the transmitter 1 is provided between the transmitter 1 and the bypass unit 6 which is installed to be connected to the multimode fiber 7. The detection unit 12 is connected to the transmitter 1 by the multi-mode fiber 7, is connected to the bypass unit 6,
The wavelength of the signal transmitted to the multimode fiber 7 is detected, and information on the wavelength of the signal is transmitted to the selection setting unit 10. Further, the wavelength detecting unit 12 is a specific wavelength transmitting unit 11 that transmits only a signal of a specific wavelength having a long wavelength or a short wavelength transmitted to the multimode fiber 7.
And a wavelength detecting unit 12 for detecting the amount of light of the signal after the signal has passed through the specific wavelength transmitting unit 11. Other configurations of the present embodiment are the same as those of the first embodiment.

Next, the operation of the optical fiber connection device and the connection method according to the second embodiment of the present invention will be described with reference to FIG. The specific wavelength transmitting section 11 has a filter characteristic of transmitting only a signal of a specific wavelength having a long wavelength or a short wavelength, and in the present embodiment, 1000 BAS
1310 nm, which is the wavelength of the E-LX communication standard signal, and 1
850 which is the wavelength of the 000BASE-SX communication standard signal
Only signals of two wavelengths of nm and 2 are transmitted. When the signals having the respective wavelengths pass through the filter, the wavelength detector 12 recognizes the signals, and determines whether the recognized signals are 1000BASE-LX communication standard signals.
Information on whether the signal is a 0BASE-SX communication standard signal is transmitted to the selection setting unit 10. The determined information is set in the selection setting unit 1
0 is received, the selection setting unit 10 determines that the transmission signal is 1000B
If the signal is the ASE-LX communication standard signal, the transmission signal passes through the fiber center matching unit 5 and the single mode fiber 4 as in the first embodiment, and the transmission signal
If the signal is a 0BASE-SX communication standard signal, the selection setting unit 10 sets the bypass unit 6 so that the transmission signal passes through the multimode fiber 3.

According to the optical fiber connection device and the connection method thereof according to the second embodiment of the present invention, only the signal of a specific wavelength having a long wavelength or a short wavelength transmitted to the multimode fiber 7 is used. Specific wavelength transmitting section 11 that transmits light
And a wavelength detector 12 for detecting the light amount of the signal after the signal has passed through the specific wavelength transmitting unit 11, so that the signal transmitted from the transmitter 1 can be transmitted automatically instead of manually. The selection setting unit 10 can select whether the communication standard is the 1000BASE-LX communication standard or the 1000BASE-SX communication standard, and it is possible to perform bypass control of the mode dispersion delay compensation unit.
It can contribute to reducing the number of construction steps and erroneous human setting when laying a network.

Third Embodiment A configuration of an optical fiber connection device according to a third embodiment of the present invention will be described with reference to FIG. Power detector 13
Is installed at one end of the multimode fiber 7 different from the end connected to the transmitter 1 so as to be connected to the multimode fiber 7 and detects the output value of a signal transmitted to the multimode fiber 7. Then, information on the output value of the signal is transmitted to the selection setting unit 10. Other configurations of the present embodiment are the same as those of the first embodiment.

Next, the operation of the optical fiber connection device and the connection method according to the third embodiment of the present invention will be described with reference to FIG. The power detector 13 determines whether the output value of a signal transmitted from the transmitter 1 through the multimode fiber 7 is larger than a predetermined value. That is, 10 bases from the 1000BASE-SX communication standard signal
Utilizing the property of the communication standard signal that the 00BASE-LX communication standard signal has a larger output value,
BASE-SX communication standard signal and 1000BASE-LX
A certain value between respective output values expected by the power detection unit 13 of the communication standard signal is set as a predetermined value, and when the output value of the signal is larger than the predetermined value, the multimode fiber 7 is transmitted from the transmitter 1 to the multimode fiber 7. The signal transmitted and transmitted is 1000B
If it is determined that the signal is an ASE-LX communication standard signal and the output value of the signal is smaller than the predetermined value, the signal transmitted from the transmitter 1 through the multimode fiber 7 is 1
000BASE-SX communication standard signal.
The information thus determined is transmitted to the selection setting unit 10, and when the transmission signal is a communication standard signal of 1000BASE-LX, the selection setting unit 10 and the fiber center matching unit 5 as in the first embodiment. If the transmission signal passes through the mode fiber 4 and the transmission signal is a communication standard signal of 1000BASE-SX, the bypass unit 6 is set so that the transmission signal passes through the multimode fiber 3.

According to the optical fiber connection device and the connection method thereof according to the third embodiment of the present invention, the multimode fiber 7 is connected to one end of the multimode fiber 7 which is different from the end connected to the transmitter 1.
A power detector 13 is installed to be connected to the multimode fiber 7, detects an output value of a signal transmitted to the multimode fiber 7, and transmits information on the output value of the signal to the selection setting unit 10. With this configuration, it is possible to perform bypass control of the mode dispersion delay compensation part automatically instead of manually, which contributes to reducing the number of construction steps and erroneous human setting when laying the network, resulting in cost merit. It can contribute to a certain commercialization.

Fourth Embodiment A configuration of an optical fiber connection device according to a fourth embodiment of the present invention will be described with reference to FIG. Power detector 13
Is the single mode fiber 4 connected to the bypass section 6.
It is installed at an end far from the upper transmitter 1 and detects the output value of the signal transmitted to the single mode fiber 4 and transmits information on the output value of the signal to the selection setting unit 10. Other configurations of the present embodiment are the same as those of the first embodiment.

Next, the operation of the optical fiber connection device and the connection method according to the fourth embodiment of the present invention will be described with reference to FIG. The power detection unit 13 itself has the same configuration as the power detection unit 13 of the third embodiment, but differs from the third embodiment in the installation location. That is, the power detection unit 13 is installed at an end far from the transmitter 1 on the single mode fiber 4 connected to the bypass unit 6. The connection setting of the first bypass unit 6 is set to be transmitted from the transmitter 1 through the multimode fiber 7 to the fiber center matching unit 5 and the single mode fiber 4. The communication standard signal from the transmitter 1 is 1000BASE-
In the case of LX, since the mode dispersion delay compensation route functions normally as a mode condition patch cord, a normal use environment is established, and communication between the transmitter 1 and the receiver 2 becomes possible. The communication standard signal from the transmitter 1 is 1000B
In the case of ASE-SX, it is not the original operating environment that short-wavelength light passes through the mode dispersion delay compensation route. For example, the fiber center matching has a structure in which the center matching of the fiber is intentionally shifted. The amount of light that can reach the power detection unit 13 due to the large attenuation caused by the passage of light having a short wavelength through the unit 5 and the transmission through the single-mode fiber 4, which is a small core fiber that is not the original operating environment, is transmitted by the transmitter. The number of communication standard signals from 1 is considerably smaller than that in the case of 1000BASE-LX. The power detector 13 determines whether or not the light amount of a signal transmitted from the transmitter 1 through the multimode fiber 7 and further through the mode dispersion delay compensation route is larger than a predetermined value.

At the place where the power detection unit 13 that has passed through these mode dispersion delay compensation routes is installed, the 1000BASE-LX communication standard signal and 1000B
A certain value between the respective light amounts with the ASE-SX communication standard signal is set as a predetermined value. If the light amount of the signal is larger than the predetermined value, it can be determined that the signal transmitted from the transmitter 1 through the multimode fiber 7 is a 1000BASE-LX communication standard signal, and the signal is larger than the predetermined value. Is small, the signal transmitted from the transmitter 1 through the multimode fiber 7 is 1000BASE-
It can be determined that the signal is an SX communication standard signal.

According to the optical fiber connection device and the connection method thereof according to the fourth embodiment of the present invention, the optical fiber connection device is installed at the end far from the transmitter 1 on the single mode fiber 4 connected to the bypass unit 6, and A power detector 13 for detecting an output value of a signal transmitted to the mode fiber 4 and transmitting information on the output value of the signal to the selection setting unit 10
With this configuration, the selection setting unit 10 can instruct the bypass unit 6 on a suitable route, and can perform bypass control of the mode dispersion delay compensation unit automatically instead of manually. This can contribute to the reduction of the man-hours for construction and the elimination of human setting mistakes when laying, and can contribute to commercialization with cost merit.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a fiber using an optical fiber connection device according to a first embodiment of the present invention.

FIG. 2 is a structural diagram of a fiber using an optical fiber connection device according to a second embodiment of the present invention.

FIG. 3 is a structural diagram of a fiber using an optical fiber connection device according to a third embodiment of the present invention.

FIG. 4 is a structural diagram of a fiber using an optical fiber connection device according to a fourth embodiment of the present invention.

FIG. 5 is a structural view of a fiber using a conventional optical fiber connecting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmitter 2 Receiver 3 Multimode fiber 4 Single mode fiber 5 Fiber center matching part 6 Bypass part 7 Multimode fiber 8 Multimode fiber 9 Selection setting part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-10-104460 (JP, A) Yuhei Iwasaki, Shin15. LAN Science Super Introductory Law, Computer & Network LAN, Japan, Ohm Co., Ltd., January 22, 1999, Vol. 17, No. 2, p. 35-39 Yasuo Ishiyama, LAN TIMES, Japan, SoftBank Corp., March 12, 1999, Vol. 9, No. 4, 130-136 (58) Fields investigated (Int. Cl ^7, DB name) H04B 10/00 -. 10/28 H04J 14/00 - 14/08 H04L 12/28 G02B 6/00

Claims (6)

(57) [Claims] 1. IEEE802.3z 1000BAS
In an optical fiber connection device having a multimode fiber and a single mode fiber of the E-LX specification,
A multimode fiber with one end connected to the transmitter,
The other end of the multimode fiber that is connected to the transmitter is connected to a bypass section that connects the multimode fiber and the single mode fiber that are connected in parallel to each other, and one end is connected to the transmitter. A multimode fiber, one end of which is connected to a receiver, which is different from the multimode fiber, and another end of the multimode fiber, which is connected to the receiver, is connected in parallel with each other. A bypass portion, which is different from the bypass portion that connects the multi-mode fiber and the single-mode fiber, the other end of which is connected to the bypass portion;
Select which of the multimode fiber and the single mode fiber connected in parallel to each other is used for the bypass connected to both ends of the multimode fiber and the single mode fiber connected in parallel to each other. And a selection setting unit for setting. 2. The transmission device according to claim 1, further comprising a transmitter connected to the multimode fiber, the transmitter being disposed between the transmitter and the bypass unit which is connected to the multimode fiber at a different end from the transmitter. And a wavelength detecting unit connected to the bypass unit, detecting a wavelength of a signal transmitted to the multimode fiber, and transmitting information on the wavelength of the signal to the selection setting unit. The optical fiber connection device according to claim 1, wherein the optical fiber connection device is provided. 3. A specific wavelength transmitting section for transmitting only a signal of a specific wavelength having a long wavelength or a short wavelength transmitted to a multi-mode fiber, and a signal transmitting section for transmitting a signal transmitted through a multimode fiber. 3. The optical fiber connection device according to claim 2, further comprising: a wavelength detection unit that detects a light amount of the signal after passing through the optical fiber. 4. A multimode fiber, which is installed at another end different from the end connected to the transmitter so as to be connected to the multimode fiber, and detects an output value of a signal transmitted to the multimode fiber. 2. The optical fiber connection device according to claim 1, further comprising a power detection unit for transmitting information on an output value of the signal to the selection setting unit. 5. A single-mode fiber connected to the bypass unit, which is installed at a far end from a transmitter, detects an output value of a signal transmitted to the single-mode fiber, and outputs information on the output value of the signal. The optical fiber connection device according to claim 1, further comprising a power detection unit that transmits the signal to the selection setting unit. 6. IEEE802.3z 1000BAS
In an optical fiber connection method having a multimode fiber and a single mode fiber of the E-LX specification, a multimode fiber and a multimode fiber and a single mode fiber connected in parallel with each other are connected via a bypass unit. An optical fiber connection method, comprising: connecting a bypass setting unit to a selection setting unit that selects and sets whether to use a multi-mode fiber or a single mode fiber connected in parallel with each other.