JP2005318314A - Optical amplifier monitoring system and optical amplifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical amplifier monitoring system in simple configuration. <P>SOLUTION: A center station and an optical amplifier are respectively provided with wavelength division multiplexing devices, and the wavelength division multiplexing devices are oppositely arranged through one optical filter so that an optical transmission path can be configured. A outgoing optical signal obtained by converting an outgoing electric signal into an optical signal by the light transmitter of the center station is transmitted from the center station through the light transmission path to the optical amplifier. Between a media converter at a light transmitter side for transmitting and receiving an optical signal between a media converter at the optical amplifier side installed in the optical amplifier, and connected to a monitor means for monitoring/controlling the operating conditions and a media converter installed in the center station at the optical amplifier side, and a optical amplifier monitoring device connected to the media converter at the light transmitter side for monitoring/controlling the optical amplifier, a signal is transmitted and received. The signal to be transmitted between the respective media converters and the outgoing optical signal are wavelength-multiplexed and transmitted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a CATV optical transmission system that mainly transmits a CATV signal using an optical transmission line, and more particularly to an optical amplifier monitoring method and an optical amplifier used in the CATV optical transmission system.

In a system in which media converters that perform signal conversion between two different transmission media are opposed to each other via a transmission medium for remote transmission, and data is remotely relayed between transmission media for local transmission, the media converter is The optical interface is connected to each media converter by connecting the optical interface between the media converter of the telecommunications company that provides the communication service and the media converter of the user receiving the communication service with optical fiber. Remote monitoring of the media converter was performed by transmitting the system maintenance signal while prohibiting data relay for a certain period of time while remotely relaying between the two networks.
(For example, see Patent Document 1)

JP 2002-101401 A

In a conventional CATV system comprising an optical transmission line, in a system that mainly transmits video signals, when transmitting from an optical signal from a center station to a sub-center station, etc., compensation of transmission loss occurring during transmission, C In some cases, an optical amplifying device is interposed to prevent the deterioration of / N. However, in the case of such image-based optical transmission, in order to monitor or control the operation state of the optical amplifier, a monitoring signal from a monitoring device provided in the optical amplifier is used using a dedicated transmission line. Monitoring is generally performed by returning signals to the center station or sub-center station, and it is necessary to install as many optical transmission lines as the number of installed optical amplifiers, which in turn increases the cost of the system. It was. Therefore, this application was made to solve these problems,
An object of the present invention is to provide an optical amplifier monitoring system capable of monitoring and controlling the optical amplifier with a simple configuration in a CATV optical transmission system including an optical amplifier for transmitting an optical signal of a video signal system. .
Another object of the present invention is to monitor an optical amplifier capable of monitoring and controlling the optical amplifier from either a center station or a sub-center station in a CATV optical transmission system having an optical amplifier for transmitting an optical signal of a video signal system. To provide a system.
Another object is to connect a center station, an optical amplifier, and a sub-center station through a single optical transmission line in a CATV optical transmission system equipped with an optical amplifier to transmit an optical signal of a video signal system. It is an object of the present invention to provide an optical amplifier monitoring system capable of transmitting system signals and optical amplifier monitoring / control signals.
Another object is to provide an optical amplifier monitoring system capable of continuously monitoring an optical amplifier in a CATV optical transmission system including an optical amplifier for transmitting an optical signal of a video signal system.

In order to solve the above-mentioned problems, the invention of claim 1 is a CATV system configured to be connected to an optical amplifier from a center station via an optical transmission line, and each of the center station and the optical amplifier has wavelength division. An optical transmission line comprising a multiplexing device and having the wavelength division multiplexing device arranged opposite to each other through a single optical fiber is configured, and the center station transmits optical transmission from the center station via the optical transmission line. An optical amplifier side connected to monitoring means for monitoring and controlling the operating state of the optical amplifier, which is provided in the optical amplifier and sends the downstream optical signal obtained by converting the downstream electrical signal into an optical signal in the apparatus And a media converter on the optical transmitter side which is provided in the center station and transmits / receives optical signals to / from the optical converter side media converter. A signal is transmitted to and received from an optical amplifier monitoring device that is connected to a media converter on the optical transmitter side and monitors and controls the optical amplifier, and a signal transmitted between the media converter, the downstream optical signal, Is configured to be wavelength-multiplexed and transmitted.

In the CATV system in which the center station and the sub-center station are connected by an optical amplifier via an optical transmission line, the center station and the optical amplifier on the center station side are respectively wavelength division multiplexed. An optical transmission line on the side of the center station that has a wavelength division multiplexing apparatus arranged opposite to each other via a single optical fiber;
The optical amplifier on the subcenter station side and the subcenter station each have a wavelength division multiplexing device, and the wavelength division multiplexing device is disposed opposite to each other via a single optical fiber. And a single optical transmission line connecting the optical amplifier on the center station side and the optical amplifier on the sub center station side, and the center station side optical transmission line From the station to the optical amplifier on the center station side, a downstream optical signal obtained by converting the downstream electrical signal into an optical signal in the optical transmitter of the center station is sent to the optical amplifier on the center station side,
A media converter provided in the optical amplifier on the center station side and connected to monitoring means for monitoring and controlling the operating state of the optical amplifier, and a medium provided in the center station and provided in the optical amplifier on the center station side A media converter on the optical transmitter side that transmits and receives optical signals to and from the converter, and an optical amplifier monitoring device that is connected to the media converter on the optical transmitter side and that monitors and controls the optical amplifier on the center station side A signal transmitted between the optical transmitter side and the media converter provided in the optical amplifier on the center station side and the downstream signal are wavelength-multiplexed and transmitted,
An optical receiver provided in the sub center station with a downstream optical signal transmitted from the center station via the optical transmission path on the sub center station side to the sub center station from the optical amplifier on the sub center station side And a media converter provided in the optical amplifier on the subcenter station side connected to a monitoring means for monitoring and controlling the operating state of the optical amplifier, provided in the optical amplifier on the subcenter station side, and the subcenter An optical receiver-side media converter that transmits and receives optical signals to and from the optical converter media converter of the sub-center side, and is connected to the optical converter-side media converter; Signals are transmitted to and received from an optical amplifier monitoring device that monitors and controls the optical amplifier on the side, and a memory provided on the optical amplifier on the center station side and the optical transmitter side is provided. And configure the signal and the downlink signal transmitted between and breakfasts converter to transmit wavelength-multiplexed.

A third aspect of the present invention is the optical amplifier monitoring system according to the second aspect, wherein one optical amplifier is provided in the optical transmission line connecting the center station and the sub-center station, and the wavelength division provided in the optical amplifier is provided. The multiplexer is configured so that it can be selectively connected to either the optical transmission line connected to the input side or the optical transmission line connected to the output side of the optical amplifier, so that the optical amplifier is connected to the center. The downstream optical signal from the station is amplified and sent to the sub-center station side, and the optical signal of the media converter on the optical amplifier side can be wavelength-multiplexed on either the input side or the output side of the optical amplifier for transmission / reception It was configured as follows.

According to a fourth aspect of the present invention, in the optical amplifier monitoring system according to the second or third aspect, the sub-center station includes a wavelength division multiplexing device, an optical receiver that converts a downstream optical signal into a downstream electrical signal, and an optical reception A media converter on the machine side and a modem, and the modem is connected to the optical amplifier monitoring device provided in the center station via a telephone line, so that the optical amplifier monitoring device provided in the center station has an optical transmission line The optical amplifying device provided in is configured to be monitored and controlled.

According to a fifth aspect of the present invention, there is provided a wavelength division multiplexing device, an optical receiver for converting a downstream optical signal into a downstream electrical signal, provided in the sub-center station before the optical amplifier monitoring system according to the fourth aspect, A media converter on the optical receiver side and a modem were installed in the house as devices on the terminal side.

According to a sixth aspect of the present invention, in the optical amplifier, the optical amplifier includes a wavelength division multiplexing device and a media converter connected to monitoring means for monitoring and controlling the operating state of the optical amplifier. The division multiplexing apparatus is configured to be selectively connectable to either the input side or the output side of the optical amplifier, and the optical signal of the media converter provided in the optical amplifier is input to the input side or the output of the optical amplifier. It is configured so that it can be wavelength-division multiplexed on either side.

According to the first aspect of the present invention, in the CATV system configured to be connected to the optical amplifier from the center station through the optical transmission line, each of the center station and the optical amplifier includes a wavelength division multiplexing device. , Constituting an optical transmission line in which the wavelength division multiplexing device is arranged opposite to the optical fiber via a single optical fiber, and the center station transmits a downstream electrical signal from the center station via the optical transmission line. A media converter on the optical amplifier side connected to monitoring means for monitoring and controlling the operating state of the optical amplifier, which is provided in the optical amplifier, and transmits a downstream optical signal converted into an optical signal to the optical amplifier; A media converter on the optical transmitter side that is provided in the center station and transmits / receives an optical signal to / from a media converter on the optical amplifier side, and a media converter on the optical transmitter side. A signal is transmitted to and received from an optical amplifier monitoring apparatus connected to an converter to monitor and control the optical amplifier, and a signal transmitted between the media converters and the downstream optical signal are wavelength-multiplexed. Since it is configured to transmit, an optical amplifier monitoring system capable of continuously monitoring and controlling the optical amplifier with a simple configuration can be provided.

According to the second aspect of the present invention, in the CATV system in which the center station and the sub-center station are connected by an optical amplifier via an optical transmission line, the center station and the center station side optical amplifier have wavelength division, respectively. An optical transmission line on the center station side provided with a multiplexing device, the wavelength division multiplexing device arranged oppositely via a single optical fiber;
The optical amplifier on the subcenter station side and the subcenter station each have a wavelength division multiplexing device, and the wavelength division multiplexing device is disposed opposite to each other via a single optical fiber. And a single optical transmission line connecting the optical amplifier on the center station side and the optical amplifier on the sub center station side, and the center station side optical transmission line From the station to the optical amplifier on the center station side, a downstream optical signal obtained by converting the downstream electrical signal into an optical signal in the optical transmitter of the center station is sent to the optical amplifier on the center station side,
A media converter provided in the optical amplifier on the center station side and connected to monitoring means for monitoring and controlling the operating state of the optical amplifier, and a medium provided in the center station and provided in the optical amplifier on the center station side A media converter on the optical transmitter side that transmits and receives optical signals to and from the converter, and an optical amplifier monitoring device that is connected to the media converter on the optical transmitter side and that monitors and controls the optical amplifier on the center station side A signal transmitted between the optical transmitter side and the media converter provided in the optical amplifier on the center station side and the downstream signal is transmitted by wavelength multiplexing,
An optical receiver provided in the sub center station with a downstream optical signal transmitted from the center station via the optical transmission path on the sub center station side to the sub center station from the optical amplifier on the sub center station side And a media converter provided in the optical amplifier on the subcenter station side connected to a monitoring means for monitoring and controlling the operating state of the optical amplifier, provided in the optical amplifier on the subcenter station side, and the subcenter An optical receiver-side media converter that transmits and receives optical signals to and from the optical converter media converter of the sub-center side, and is connected to the optical converter-side media converter; Signals are transmitted to and received from an optical amplifier monitoring device that monitors and controls the optical amplifier on the side, and a memory provided on the optical amplifier on the center station side and the optical transmitter side is provided. Since the signal transmitted between the optical converters and the downstream signal are multiplexed and transmitted, the center station, optical amplifier, and sub-center station are each connected by a single optical transmission line. And an optical amplifier monitoring / control signal can be transmitted, and a system that can continuously monitor the optical amplifier of the system with a simple configuration can be provided.

According to the invention of claim 3, in the optical amplifier monitoring system according to claim 2, one optical amplifier is provided in the optical transmission line connecting the center station and the sub-center station, and the optical amplifier is provided. The wavelength division multiplexing apparatus is configured so that it can be selectively connected to either an optical transmission line connected to the input side of the optical amplifier or an optical transmission line connected to the output side. The downstream optical signal from the center station is amplified and sent to the sub-center station side, and the optical signal of the media converter on the optical amplifier side is wavelength-multiplexed on either the input side or the output side of the optical amplifier. Since it is configured to transmit and receive, a versatile optical amplifier monitoring system that can be selected so that the optical amplifier can be monitored and controlled from either the center station or the sub-center station is provided. It can be.

According to the invention of claim 4, in the optical amplifier monitoring system according to claim 2 or 3, the sub-center station includes a wavelength division multiplexing device, an optical receiver for converting a downstream optical signal into a downstream electrical signal, A media converter on the optical receiver side and a modem are connected to the optical amplifier monitoring device provided in the center station via a telephone line, so that the optical amplifier monitoring device provided in the center station is an optical amplifier. Since the optical amplifying device provided in the transmission line is configured to be monitored and controlled, it is only necessary to provide the optical amplifier monitoring device in the center station, and an optical amplifier monitoring system can be provided at a lower cost.

According to the invention of claim 5, before the optical amplifier monitoring system of claim 4, the wavelength division multiplexing device provided in the sub-center station and the optical receiver for converting the downstream optical signal into the downstream electrical signal Since the media converter on the optical receiver side and the modem are installed in the house as devices on the terminal side, an optical amplifier monitoring device can be provided only in the center station even in a system that pulls into the house via an optical transmission line. An optical amplifier monitoring system can be provided.

According to the invention of claim 6, in the optical amplifier, the optical amplifier includes a wavelength division multiplexing device and a media converter connected to monitoring means for monitoring and controlling the operating state of the optical amplifier. The wavelength division multiplexing apparatus is configured to be selectively connectable to either the input side or the output side of the optical amplifier, and the optical signal of the media converter provided in the optical amplifier is input to the input side of the optical amplifier. Alternatively, since it is configured to be able to transmit and receive by wavelength multiplexing to either of the output side, it is possible to provide an optical amplifier that can monitor the operation state of the optical amplifier from the center station or from the sub-center station in accordance with the design status of the CATV system. .

Hereinafter, an example of an embodiment embodying the present invention will be described in detail with reference to the drawings.
FIG. 1 is a system diagram showing a first embodiment of an optical amplifier monitoring system in the present application. FIG. 2 is a schematic configuration diagram of the optical amplifier. 3 and 4 are system diagrams showing a second embodiment of the optical amplifier monitoring system in the present application. FIG. 5 shows a different embodiment of the present application.

A first embodiment of the present application will be described and described with reference to FIGS. 1 and 2. In FIG. 1, reference numeral 10 denotes a center station. A signal received by the antenna 2 is subjected to predetermined processing by the head end device 3, and then converted into a downstream optical signal by the optical transmitter indicated by 4. The optical signal transmitted from the optical transmitter 4 is amplified to a predetermined level in the optical amplifier 5 and then input to the wavelength division multiplexing apparatus on the optical transmitter side indicated by 6 through the optical fiber 6a. The wavelength division multiplexing apparatus 6 is a combiner that combines optical signals having different wavelengths, and a demultiplexer that demultiplexes the wavelength-multiplexed signals into respective signals.
7 is a media converter on the optical transmitter side, and 8 is an optical amplifier monitoring device, which are connected by, for example, an Ethernet (R) cable 9 and the like, and are configured to transmit and receive data to and from each other. Further, the media converter 7 is connected to the wavelength division multiplexing device 6 via an optical fiber 6b, whereby the media converter 7 and the optical transmitter 4 are connected to the optical fiber via the wavelength division multiplexing device 6. The cable 11 is connected to the cable 11.

The center station 10 is connected to an optical amplifying apparatus indicated by 20 through an optical fiber cable 11.
The optical amplifying device 20 disposed on the center station side includes an optical amplifier 20a, a wavelength wavelength division multiplexing device 12 on the optical amplifier side, and a media converter 13 on the optical amplifier side. The wavelength division multiplexing apparatus 12 is disposed opposite to the wavelength division multiplexing apparatus 6 on the optical transmitter side provided in the center station 10 via the optical fiber cable 11 and the wavelength division multiplexing apparatus 12. Are connected to the optical width device 20a and the media converter 13 via optical fibers 12a and 12b, respectively.
The optical amplifier 20a is provided with monitoring means 100, and is configured to monitor and control the operating state of the optical amplifier 20a. The monitoring means 100 and the media converter 13 are connected by, for example, an Ethernet (R) cable 15, and the monitoring signal from the monitoring means 100 and the monitoring means 100 are connected between the monitoring means 100 and the media converter 13. The control signal is sent and received.
In this way, the downstream optical signal is transmitted between the center station 10 and the optical amplifier 20 on the center station side via the optical fiber cable 11, and the media converter 7 of the center station 10 and the media converter of the optical amplifier 20 are also transmitted. 13 is configured to transmit / receive monitoring / control signals to / from the terminal 13.

Next, the optical amplifying device 20 is connected to an optical amplifier 25 on the sub-center station side through an optical fiber cable 21.
This optical amplifying device 25 includes an optical amplifier 25a, a wavelength wavelength division multiplexing device 26 on the optical amplifier side, and a media converter 27. The optical amplifier 25a and the media converter 27 are connected to the wavelength through 26a and 26b, respectively. The wavelength division multiplexing apparatus is connected to an optical fiber cable 31 and connected to the division multiplexing apparatus 26.
The optical amplifier 25a is provided with monitoring means 100, and is configured to monitor and control the operating state of the optical amplifier 25a. The monitoring means 100 and the media converter 27 are connected by, for example, an Ethernet (R) cable 28, and the monitoring signal from the monitoring means 100 and the monitoring means 100 are connected between the monitoring means 100 and the media converter 27. The control signal is sent and received.

Next, the optical amplifier 25 is connected to the sub-center station 30 via the optical fiber cable 31.
On the sub-center station 30 side, a wavelength wavelength division multiplexing device 32 on the optical amplifier side, a media converter 33 on the optical amplifier side, a monitoring device 34 on the optical amplifier 25, and the downstream optical signal are converted into downstream electrical signals. An optical receiver 36 is provided. The wavelength division multiplexing apparatus 32 is disposed opposite to the wavelength division multiplexing apparatus 26 provided in the optical amplifier 25 on the sub-center station side via the optical fiber cable 31. An optical receiver 36 and a media converter 33 are connected to the outputs via optical fibers 32a and 32b.
An optical amplifier monitoring device 34 is connected to the media converter 33 on the optical receiver side by, for example, an Ethernet (R) cable 35 or the like.
In this way, the downstream optical signal is transmitted between the optical amplifying device 25 and the sub center station 30 via the optical fiber cable 31, and the media converter 27 of the optical amplifying device 25 and the media converter of the sub center station 30 are also transmitted. 33 is configured to send and receive monitoring and control signals to and from the computer 33.

The optical amplifier monitoring system configured as described above will be described in more detail.
First, a downstream electrical signal of, for example, 70 to 770 MHz band transmitted from the head end device 3 of the center station 10 is converted into a downstream optical signal having a wavelength of 1.55 μm by the optical transmitter 4 and then transmitted to the optical amplifier 5. It is appropriately amplified and input to the wavelength division multiplexer 6. The optical signal that has passed through the wavelength division multiplexer 6 is input to the optical amplifier 20a via the optical fiber cable 11 and the wavelength division multiplexer 12 provided in the optical amplifier 20 on the center station side. After being amplified to a predetermined level in the optical amplifier 20a, it is sent to the optical amplifying device 25 on the sub-center station side via the optical fiber cable 21. Also in this optical amplifying device 25, after being amplified at a predetermined level by the optical amplifier 25 a, an optical receiver is passed from the wavelength division multiplexing device 26 through the optical fiber cable 31 through the wavelength division multiplexing device 32 of the sub-center station 30. 36. Signals in the 70 to 770 MHz band, which are downstream electrical signals converted and output by the optical receiver 36, are transmitted while being branched and distributed through transmission paths (not shown) such as coaxial cables. To go.

In order to stabilize the transmission quality in the transmission path of the downstream optical signal, it is necessary to monitor the operation state of the optical amplifier in each optical amplifier. For example, the input level and output level of the optical signal in the optical amplifier, the operating temperature, etc. are monitored. Therefore, as shown in FIG. 2, the optical amplifier 20a is provided with monitoring means 100. The monitoring unit 100 acquires A / D converters 121 and 122 that acquire various analog data from the optical amplifier circuit 120 that requires monitoring, and converts the analog data into digital signals, respectively, and the A / D converter. The control unit 124 controls the outputs from 121 and 122, and is provided in the optical amplifier 20a. The monitoring means 100 is configured to convert the monitoring data acquired from the optical amplifier from an analog signal to a digital signal, and to convert it into a 10BASE-T or 100BASE-TX signal and output it.

A media converter 13 is connected to the monitoring means 100 via, for example, an Ethernet (R) cable 15 that transmits the 10BASE-T or 100BASE-TX signal. This media converter 13 is a device for converting the input digital data into an optical signal for long-distance transmission, and is compliant with 10BASE-FL or 100BASE-FX specified in IEEE 802.3. It has an optical fiber interface, accepts various types of monitoring data acquired by the monitoring means 100 provided in the optical amplifier 20a, and sends the monitoring data as an optical signal.

An optical signal output from the media converter, for example, an optical signal in the 1.31 μm band, is input to the wavelength division multiplexing device 12 through the optical fiber 12b, and is multiplexed with the downstream optical signal in the wavelength division multiplexing device 12. Then, it is sent to the wavelength division multiplexing apparatus 6 provided in the center station 10 via the optical fiber cable 11.
The wavelength division multiplexing apparatus 6 receives a downstream optical signal of 1,55 μm band via the optical fiber 6a and transmits it to the optical fiber cable 11 as shown above. The 1.31 μm band optical signal transmitted from the media converter 13 is demultiplexed by the wavelength division multiplexer 6 and then transmitted to the media converter 7 provided in the center station 10 via the optical fiber 6b. Entered. The media converter 7 has the same configuration as that of the media converter 13 on the optical amplifier side, and outputs the input 1.31 μm optical signal as a 10BASE-T or 100BASE-T signal.
Further, the media converter 7 on the center station 10 side is provided with a media converter management device via, for example, an Ethernet (R) cable 9, and the monitoring data of the optical amplifier 20a is processed in the management device. , And a display unit such as a monitor can display the status.

Further, as shown in FIG. 2, a digital signal input to the monitoring means 100 as a 10BASE-T or 100BASE-TX signal is received by the control unit 124, and the signal from the control unit 124 is used to control each unit. By providing the D / A converter 123 for converting to a necessary analog signal, the optical amplifier 20a can be remotely controlled from the optical amplifier monitoring device 8 via the media converters 7 and 13. In this embodiment, the optical signal transmitted from the media converter 7 to the media converter 13 is a signal having a wavelength of 1.49 μm band for remote control from the optical amplifier monitoring device 8.

The optical transmission line between the optical amplifier 25 on the sub center station side and the sub center station 30 is also configured to have the same configuration as described above. That is, the wavelength division multiplexers 26 and 32 are arranged opposite to each other via the optical fiber cable 31, and the wavelength division multiplexer 26 on the optical amplifier side includes the monitoring means 100 provided in the optical amplifier 25 and the Ethernet (R). A media converter 27 connected by a cable 28 is connected, and a media converter 32 is connected to the wavelength division multiplexing device 32 on the sub-center station side, and is arranged opposite to each other. 33 is connected to an optical amplifier monitoring device 34 via an Ethernet (R) cable. A downstream optical signal is transmitted from the optical amplifier to the sub-center station 30 via the optical fiber cable 31, and a media converter. An optical signal transmitted and received between 27 and 33 is transmitted by wavelength division multiplexing. It has been.

In the first embodiment, the optical amplifier monitoring system in the optical transmission line between the center station 10 and the sub-center station 30 has been described. For example, as shown in FIG. 5, the optical transmission line is replaced with a sub-center station. Considering the case of drawing into a house such as a building as a terminal, this house includes a wavelength division multiplexing device 32, an optical receiver 36, and a media converter 33, and also outputs the output signal of the media converter 33 to a telephone. The media converter 33 is connected to the voice modem 37 via the telephone cable 38, and the voice modem 37 is connected to the center station via the telephone line 39. 10 monitoring of the operational state of the optical amplifier 25 and control by the monitoring device 8. It may be configured to be to perform.
In the embodiment of the present application, an optical signal having a wavelength of 1.55 μm band is used for transmission of the downstream optical signal, and an optical signal having a wavelength of 1.31 μm band and 1.49 μm band is used for transmission / reception of the optical signal between the media converters. Although the example using is shown, it is not limited to this use example. Moreover, although the example provided with two optical amplifiers was shown, it is not limited to this embodiment.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the following description, the same components as those in the first embodiment are given the same reference numerals, and detailed description thereof is omitted.

This optical amplifier monitoring system is a system that transmits the center station 10 and the sub-center station 30 with one optical amplifier 20. In this system as well, the wavelength division multiplexing device is arranged opposite to the optical fiber cable as in the above example, and the downstream optical signal and the optical signal transmitted / received between the media converters are wavelength division multiplexed and transmitted. However, the feature of this embodiment is that the connection path of the wavelength division multiplexing apparatus 12 provided in the optical amplifier can be selectively switched using the switching means between the input side and the output side of the optical amplifier 20a. Thus, whether to send / receive a signal to / from the media converter 13 that optically converts the data monitored for the operation state of the optical amplifier is performed with the media converter 7 on the center station 10 side or with the media converter 33 on the sub center station side. It is intended to provide a system that can select.

The optical amplifier used in this system will be described in more detail. This optical amplifying device 20 is provided with switching means 18a and 18b on the input side and output side of the optical amplifier 20a.
According to this embodiment, as shown in FIG. 3, when the media converter management device 8 of the center station 10 monitors and controls the optical amplifier 20a, the optical signal from the optical fiber cable 11 is sent from the switching means 18a. In addition to being input to the optical amplifier 20 a via the wavelength division multiplexing device 12, a media converter 13 is connected to the wavelength division multiplexing device 12, and signals are transmitted to and from the media converter 7 of the center station 10. By performing transmission / reception, the media converter management device 8 of the center station 10 can monitor and control the optical amplifier 20a.
On the contrary, as shown in FIG. 4, when the media converter management device 34 of the sub-center station 30 monitors and controls the optical amplifier 20a, the optical signal amplified by the optical amplifier 20a is wavelength-divided from the switching means 18b. In addition to being output to the optical fiber cable 21 via the multiplexing device 12, the wavelength division multiplexing device 12 is connected to the media converter 13 as described above, and is connected to the media converter 33 of the sub-center station 30. By transmitting and receiving signals, the media converter management device 34 of the sub center station 30 can monitor and control the optical amplifier 20a.

As described above, according to the embodiment shown in the present application, in an optical transmission system including an optical amplifier, in order to transmit a downstream optical signal and to monitor and control the optical amplifier, the optical amplifier, the sun station, and the sub-center. A single optical transmission line is provided between the stations, and the wavelength division multiplexing apparatus is arranged oppositely through the optical transmission line, thereby not only transmitting the downstream optical signal but also monitoring the operating state of the optical amplification apparatus. The media converter connected to the monitoring means 100 for handling the signal to be controlled and the media converter provided in the center station and sub-center station are configured to transmit and receive optical signals to each other, and further monitored by an optical amplifier monitoring device. As a result of the control, an optical transmission line can be realized with a single optical fiber, and a system that can continuously monitor the optical amplifier with simple construction is proposed. Than is possible.
Further, by adopting the configuration as in the second embodiment, it is possible to provide a highly versatile optical amplifier monitoring system that can monitor the optical amplifier from either the center station side or the sub-center station side according to the system status. is there.

Note that the present invention is not limited to the above-described embodiment, and the configuration of each part can be appropriately changed and implemented without departing from the spirit of the present invention.

1 is a system diagram showing a first embodiment of an optical amplifier monitoring system in the present application. It is a schematic block diagram of an optical amplifier. It is a system diagram which shows 2nd Embodiment of the optical amplifier monitoring system in this application. It is a system diagram which shows 2nd Embodiment of the optical amplifier monitoring system in this application. This is a different embodiment of the present application.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Antenna, 3 ... Head end, 4 ... Optical transmitter, 5 ... Optical amplifier, 6 ... Wavelength division multiplexing apparatus, 6a * 6b ... Optical fiber, 7 ... Media converter, 8 ... Media converter management apparatus, 9 ... Ethernet (R) cable, 10 ... center station, 11 ... optical fiber cable, 12 ... wavelength division multiplexer, 12a, 12b ... optical fiber, 13 ... media converter, 15 ... Ethernet (R) cable, 18a, 18b ... switching means , 20 ... Optical amplifying device, 20a ... Optical amplifier, 21 ... Optical fiber cable, 25 ... Optical amplifying device, 25a ... Optical amplifier, 26 ... Wavelength division multiplexing device, 26a and 26b ... Optical fiber, 27 ... Media converter, 28 ... Ethernet (R) cable, 29 ..., 30 ... Sub-center station, 31 ... Optical fiber cable, 32 ... Wavelength Split multiplexer 33 ... Media converter 34 ... Media converter management device 35 ... Ethernet (R) cable 36 ... Optical receiver 100 ... Monitoring means 120 ... Optical amplifier circuit 121,122 ... A / D conversion , 123 ... D / A converter, 124 ... control unit

Claims (6)

In a CATV system configured to be connected to an optical amplifier from a center station via an optical transmission line,
Each of the center station and the optical amplifier includes a wavelength division multiplexing device, and configures an optical transmission line in which the wavelength division multiplexing device is arranged to be opposed to each other through a single optical fiber,
Via the optical transmission line
From the center station, a downstream optical signal obtained by converting a downstream electrical signal into an optical signal in the optical transmitter of the center station is sent to the optical amplifier, and
An optical amplifier side media converter connected to a monitoring means for monitoring / controlling an operating state of the optical amplifier provided in the optical amplifier, and a media converter on the optical amplifier side provided in the center station. , Configured to send and receive signals between an optical transmitter-side media converter that transmits and receives optical signals and an optical amplifier monitoring device that is connected to the optical converter-side media converter and that monitors and controls the optical amplifier An optical amplifier monitoring system characterized in that a signal transmitted between the media converters and the downstream optical signal are wavelength-multiplexed and transmitted.
In a CATV system in which an optical amplifier is connected between a center station and a sub-center station via an optical transmission line,
The center station and center station optical amplifiers are each equipped with a wavelength division multiplexing device, and the wavelength division multiplexing device is disposed opposite to the optical transmission line on the center station via a single optical fiber;
The optical amplifier on the subcenter station side and the subcenter station each have a wavelength division multiplexing device, and the wavelength division multiplexing device is disposed opposite to each other via a single optical fiber. When,
It is connected by a single optical transmission line that connects between the optical amplifier on the center station side and the optical amplifier on the sub-center station side,
Via the optical transmission line on the center station side,
From the center station to the optical amplifier on the center station side, a downstream optical signal obtained by converting a downstream electrical signal into an optical signal in the optical transmitter of the center station is sent to the optical amplifier on the center station side,
A media converter provided in the optical amplifier on the center station side and connected to monitoring means for monitoring and controlling the operating state of the optical amplifier, and a medium provided in the center station and provided in the optical amplifier on the center station side A media converter on the optical transmitter side that transmits and receives optical signals to and from the converter, and an optical amplifier monitoring device that is connected to the media converter on the optical transmitter side and that monitors and controls the optical amplifier on the center station side A signal transmitted between the optical transmitter side and the media converter provided in the optical amplifier on the center station side and the downstream signal are wavelength-multiplexed and transmitted,
Via the optical transmission line on the sub-center station side,
From the optical amplifier on the sub center station side to the sub center station, the downstream optical signal transmitted from the center station is transmitted to an optical receiver provided in the sub center station,
A media converter provided in the optical amplifier on the subcenter station side connected to a monitoring means for monitoring and controlling the operating state of the optical amplifier provided in the optical amplifier on the subcenter station side, and provided in the subcenter station , A media converter on the optical receiver side that transmits and receives optical signals to and from the media converter of the optical amplifier on the subcenter side, and an optical amplifier on the subcenter station side that is connected to the media converter on the optical receiver side A signal is transmitted / received to / from an optical amplifier monitoring device that monitors and controls the optical amplifier, and a signal transmitted between a media converter provided in the optical amplifier on the center station side and an optical transmitter side and the downstream signal are wavelength-multiplexed. An optical amplifier monitoring system characterized in that
The optical transmission line connecting the center station and the sub-center station is provided with one optical amplifier, and the wavelength division multiplexing device provided in the optical amplifier is an optical transmission line connected to the input side of the optical amplifier or By being configured so that it can be selectively connected to one of the optical transmission lines connected to the output side, the optical amplifier amplifies the downstream optical signal from the center station and sends it to the sub-center station side, The optical amplifier monitoring system according to claim 2, wherein the optical signal of the media converter on the optical amplifier side is configured to be wavelength-multiplexed and transmitted to either the input side or the output side of the optical amplifier.
The sub-center station consists of a wavelength division multiplexer, an optical receiver that converts downstream optical signals into downstream electrical signals, a media converter on the optical receiver side, and a modem.
The modem is connected to the optical amplifier monitoring device provided in the center station through a telephone line.
4. The optical amplifier monitoring system according to claim 2, wherein the optical amplifier monitoring device provided in the center station is configured to monitor and control an optical amplifying device provided in an optical transmission line.
A wavelength division multiplexing device provided in the sub-center station, an optical receiver that converts a downstream optical signal into a downstream electrical signal, a media converter on the optical receiver side, and a modem are distributed in the house as a terminal side device. The optical amplifier monitoring system according to claim 4, wherein the optical amplifier monitoring system is provided.
In an optical amplifier,
The optical amplifier includes a wavelength division multiplexing device and a media converter connected to monitoring means for monitoring and controlling the operating state of the optical amplifier.
The wavelength division multiplexing apparatus is configured to be selectively connectable to either the input side or the output side of the optical amplifier, and the optical signal of the media converter provided in the optical amplifier is input to the input side of the optical amplifier. Alternatively, an optical amplifier characterized in that it can be wavelength-multiplexed on either of the output sides for transmission / reception.

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