JPS62502234A - optical communication network - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] optical communication network 【Technical field〕 The present invention relates to optical communication networks, such as local area networks.

[Background technology]

Switching of optical signal wavelength for communication between transmitting terminal and selected receiving terminal For example, CA-1-1,052,865 and Tallemens Park, Barr. ``Tuture Optical Carrier Frequency Ch'' by Chius Technology in Glass Fiber Networks J, NTZ No. 351 (1982) No. 11 (rFuture 0p-ttcal Carrier Fr1quency Technology in Glass Fiber NetworksJ + C1esens Baack, Ern5t-J a nd Bachus+ Bernhard 5trebel+ NZT Vol. .

35 (19B2) No. 11). These conventional techniques The communication networks described in the technical literature have very limited performance and require only one-to-one communication between terminals. I can only tolerate it. Such networks are suitable for telephone or video telephony, but Facilities for distributing books, announcing events, and calling meetings are acceptable. The three facilities above zero that are increasing the need for more complex communication networks are: These are examples of one-to-many, many-to-many, and many-to-many communication, respectively. So far, different Services have a fixed physical phase space depending on their respective facilities. Delivered in a separate set of devices. This applies to each file [disclosure of the invention]. The broadband communication network of the present invention includes a plurality of first transmitting terminals and first receiving terminals, and a common the first transmitting terminal and the first receiving terminal are optically connected to each other. configured to transmit signals from each first transmitting terminal to all first receiving terminals. Yes, the control device controls the transmission and transmission of the first transmitting terminal and/or the first receiving terminal. It is a configuration that controls the wavelength of the signal to be transmitted or detected. The device adapts to multiple phase spaces consisting of three or more terminals.

The present invention allows a common control device to use the wavelength switching principle to control the physical phase Various phase spaces can be set without changing the space, and conventional communication networks provides a more versatile communication network compared to This transforms the physical phase, space, into the smallest It can be constructed from optical waveguides, allowing for low cost and simple construction. control The device is placed in a central location from which it is possible to control which terminals are connected to the cluster.

Furthermore, by making the phase space of each terminal group independent from that of other terminal groups, various different terminal groups can be used. They can be operated simultaneously.

The controller also allocates channels of different bandwidths depending on the capabilities of the terminals. It can be used for telephone communication and video communication.

Typically, a single module is used to minimize loss and take full advantage of wavelength multiplexing capabilities. The terminals are optically coupled via a wired optical fiber.

- By way of example, each first transmitting terminal may include tuning means for setting the wavelength of each optical carrier signal. The control means is configured to control the tuning means of - or more terminal groups, and thereby , terminals within each terminal group can communicate. The advantage of this communication network is that the receiving terminal Detects only fixed frequencies and receives only specified signals, ensuring confidentiality. It has inherent protective properties.

? , 9iBU62-502234 (2) As another example, each first receiving terminal receives It may also include tuning means for setting the wavelengths that the terminal can detect.

Optically coupling each transmitting terminal to a common wavelength multiplexing means providing multiple multiplexed outputs However, it is desirable to couple each output of this wavelength multiplexing means to each first receiving terminal.

The wavelength multiplexing means connects a conventional wavelength multiplexer and a wavelength demultiplexer. Alternatively, the power combiner and power splinter may be connected.

including a second transmitting terminal, a first receiving terminal and a second receiving terminal, the first transmitting terminal and the first receiving terminal; communication between a group of three or more stations via a receiving terminal of The configuration shall be one-to-one communication between stations via the receiving terminal and the second receiving terminal. desirable.

Embodiments of a broadband communication network according to the present invention will be described with reference to the accompanying drawings.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the first embodiment.

FIG. 2 is a block diagram of the second embodiment.

FIG. 3 is a block diagram of a third embodiment.

FIG. 4 shows a modification of the embodiment shown in FIG.

5 and 6 show a communication network formed by a plurality of subordinate communication networks.

[Best mode for carrying out the invention]

The example shown in Figure 1 is a local area network that includes N stations 1; Each station 1 includes an optical signal transmitter 2 and an optical signal receiver 3. Transmitter 2 will be explained later. It is tunable to transmit an optical carrier signal at a selected wavelength. each receiver 3 detects a fixed optical wavelength, and this optical wavelength differs for each receiver 3.

The transmitters 2 are all connected to a power combiner 4, which is connected to the transmitter 2. , and has N outputs each connected to a receiver 3. Supplied to multiplexer 5.

Tuning of the optical transmitter 2 is controlled by a central network control terminal 6 provided within the communication network. Ru.

For example, consider a ring phase space in which four stations 1 (A, B, C, and D) are connected in a ring. In order to realize a communication network, the network control terminal 6 connects the transmitter 2 of station A to the receiver of station B. A carrier wave signal of a wavelength corresponding to the detectable wavelength is transmitted. Transmitter 2 of station B is The receiver at station C transmits a signal that can be detected, and the transmitters at stations C and D are also controlled in the same way. Set up a new communication ring.

For the remaining station 1, use the same method to obtain other phase spaces including one-to-one communication. can be combined with

Physically, this is a single mode function between the station and the wavelength demultiplexer 5. Communication can be configured with dispersive elements to minimize fiber usage This part of the web can also be a tree and branch structure.

The network control terminal 6 is equivalent to the station 1, and may be placed anywhere within the communication network. Therefore Therefore, the communication network away from the station is entirely passive.

If it is operationally convenient, the network control terminal 6 may be placed at the center of the separation and connection function. .

Another embodiment is shown in FIG. In this example, the transmission m2 is fixed to a different wavelength for each station 1. The receiver 3 transmits a fixed optical carrier signal, but the receiver 3 can be tuned by the network control terminal 6. be.

The transmitter 2 is optically coupled to the wavelength multiplexer 7 via a single mode optical fiber. The output of this wavelength multiplexer 7 is combined into N outputs connected to each receiver 3. It is connected to a power splinter 8 having power.

The operation of this communication network is to tune the receiver 3 to detect the selected wavelength. The communication network is the same as the communication network shown in FIG. 1 except for the following. This communication network realizes one-to-many communication can do. The communication control directs each of the selected groups of receivers 3 to a broadcast message. It is tuned to the wavelength of the transmitter 2 that generates the tssage.

Basically, the tuning range of the filter of receiver 3 is the optical window, e.g. 1250n m to 1600 nm. If currently used direct detection equipment is used, In this case, the number of stations 1 is limited to about 300 by power splinter 8, and If a digital device is used, the number can be increased to about 1000 or more.

The communication network shown in FIG. The outside is equivalent to the communication network shown in FIG. Although the power coupler 9 increases the loss, , the simplest passive communication network can be realized.

FIG. 4 shows a modified example of the embodiment shown in FIG. In the embodiment shown in FIG. The power splinter 8 and power combiner 9 shown in the figure are connected to a star that can transmit data in the N direction. It has been replaced by a form coupler 10. This communication network consists of a transmitter 2 and a receiver [3]. Since both sides can be synchronized, it can be used for more purposes. Furthermore, in the example shown in Figure 3, The loss introduced by the power splitter 8 and the power combiner 9 in the first The loss level of the embodiment shown in Fig. 2 is reduced to the level of the embodiment shown in Fig. 2. Compared to the case where wavelengths are assigned to specific terminals, the example can allocate wavelengths on a traffic-based basis. Additionally, the terminal configuration It does not require strict alignment of elements to the components of the communication network, making manufacturing and implementation much easier. becomes easier.

In the above embodiment, the network control terminal 6 is connected to a communication network connected to the control computer. is configured as a standard terminal (which can be placed anywhere within the communication network). between terminals All calls, topological settings are made via the control computer, and each terminal , during call setup! ll1l! Communicate with the control terminal.

Although the above embodiments are all examples of small communication networks, the terminals selected from each communication network 1 as a gateway between small "elementary" communication networks and use it in a continuous manner. By doing so, it is possible to construct a large communication network. This is shown in Figure 5, and this In the figure, communication networks 1 to N are interconnected by terminal 1 via optical fiber links. connected to. The communication networks are physically connected in a ring, and each communication network has an alternative They can communicate with each other and other communication networks via the path. For example, the communication network 1 may be directly or Communication with the communication network N is possible through one route via the communication network 2.

In another configuration, as shown in FIG. They can be connected to each other via 1. This space switch 11 additionally provides multiple controls. In order to set the discharge through the space switch 11, the "elemental 1 communication network" The controllers need to communicate with the switch controller 12. This means that the switch Poll each of the three gateways in turn to display the status of the spatial switch. This can be easily realized using a polling method that stores a local memory map.

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Claims (4)

[Claims] 1. A plurality of first transmitting terminals and first receiving terminals and a common control device. Equipped with The first transmitting terminal and the first receiving terminal are optically coupled to each other for each first transmitting terminal. It is configured to transmit the signal from the terminal to all first receiving terminals, The control device controls the transmission of the first transmitting terminal and/or the first receiving terminal. controls the wavelength of the detected signal and applies the communication network to multiple phase spaces of three or more terminal groups. Optical broadband communication network, which is a configuration that combines 2. The first transmitting terminal includes tuning means for setting the wavelength of the respective optical carrier signal. , The control means controls the synchronization of one or more terminal groups in order to perform communication between the terminals of each terminal group. The communication network according to claim 1, wherein the communication network is configured to control a control means. 3. The transmitting terminals are optically connected to a common wavelength multiplexing means, which multiplexing means 3. A communications network as claimed in claim 2, including an output coupled to a receiving terminal. 4. Contains multiple stations, Each station has a first transmitting terminal, a second transmitting terminal, a first receiving terminal, and a second receiving terminal. including the end, A group consisting of three or more stations via a first transmitting terminal and a first receiving terminal. Communication between stations simultaneously and independently via the second transmitting terminal and second receiving terminal. According to any one of claims 1 to 3, the device is configured to enable one-to-one communication. communication network.