JPH10336152A - Data communication system, unit holding device and signal transmitting unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly impart the identifiers of a wave length channel and a space channel to an optical signal by permitting the unit holding devices of the plural space channels to generate their own identifiers so as to report them to a mounted signal transmitting unit and permitting the signal transmitting unit to impart the reported identifiers to an outputted optical signal. SOLUTION: Respective mounting slots 13 are independently provided with identifier generating parts 21 being a channel reporting means and respective transmission cards 11 are provided with an identifier detecting part 22, an identifier adding part 23 and a signal output part 24. The signal output parts 24 output the optical signal by laser light in accordance with an external input. The identifier generating parts 21 of the mounting slots 13 generate specified potential as the identifier corresponding to the space channel. The identifier detecting parts 22 judge the space channel from potential reported from the mounting slots 13 as an identifier so as to control the operation of the identifier adding parts 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication system, a unit holding device, and a signal transmission unit corresponding to a plurality of wavelength channels and a plurality of spatial channels.

[0002]

2. Description of the Related Art Hitherto, a data communication system for multiplexing an optical signal with a wavelength channel or a spatial channel for communication has been used as a system for communicating large-capacity signals with high efficiency. Publication No.
No. 233394.

In such a data communication system, signals are generally communicated by laser light using an optical fiber as a communication path. For example, multiplexing of wavelength channels is realized by transmitting a plurality of laser lights having different output wavelengths through one optical fiber, and multiplexing of spatial channels collects a plurality of optical fibers into one. This is achieved by:

As described above, as a data communication system in which wavelength channels and spatial channels are multiplexed, a large number of laser light sources corresponding to a plurality of wavelength channels and a plurality of spatial channels are individually provided in a large number of signal transmission units. There is a type in which the large number of signal transmission units are detachably attached to a large number of unit holding devices to which a large number of optical fibers are individually fixed.

[0005] A data communication system having such a structure will be briefly described below. As described above, a plurality of signal transmission units individually including a plurality of laser light sources correspond to a plurality of wavelength channels and a plurality of spatial channels, and convert one optical signal of the plurality of wavelength channels into a plurality of spatial channels. Output individually to one of For example, when four wavelength channels and three spatial channels are supported, each of the three spatial channels communicates optical signals of four wavelength channels, so that there are twelve signal transmission units.

[0006] A large number of unit holding devices to which such a large number of signal transmission units are detachably attached are provided, and a large number of optical fibers are individually fixed to the large number of unit holding devices. As described above, when the optical signal corresponds to four wavelength channels and three spatial channels, there are twelve unit holding devices and twelve optical fibers. Since these twelve optical fibers are formed into a single united shape, this corresponds to multiplexing of a plurality of spatial channels.

A large number of optical signals of a plurality of wavelength channels transmitted by a large number of optical fibers are multiplexed for each of a plurality of spatial channels by a star coupler as a plurality of spatial multiplexing means. That is, as described above, when optical signals individually corresponding to four wavelength channels and three spatial channels are individually transmitted by twelve optical fibers, for example, these twelve optical fibers are The four star couplers are connected to each other, and the three star couplers are connected to three optical fibers one by one. In this case, each of the three star couplers individually corresponds to three spatial channels, and multiplexes the input optical signals of the four wavelength channels into one to form one of the three spatial channels. Output.

As described above, one of the optical signals of a plurality of spatial channels in which a plurality of wavelength channels are multiplexed is selected by an optical switch serving as a space selecting means. In other words, as described above, when three optical signals in which four wavelength channels are multiplexed are individually transmitted through three optical fibers,
The structure is such that these three optical fibers are connected to one optical fiber via one optical switch. This optical switch selects one of the three optical fibers on the input side and connects it to one optical fiber on the output side, so that the optical signals of three spatial channels in which four wavelength channels are multiplexed are used. One will be selected.

[0009] The optical signal obtained by multiplexing the wavelength channels of one spatial channel selected as described above is selected from the optical signals of one wavelength channel by an optical filter serving as a wavelength selecting means. That is, as described above, one optical signal selected as one spatial channel has four wavelength channels multiplexed, so that an optical signal of one wavelength channel is selected by an optical filter. Since one optical signal selected in this way corresponds to one spatial channel and one wavelength channel, this is photoelectrically converted by a light receiving element serving as a signal receiving means and used as a communication result.

In the data communication system having the above-described structure, since an optical signal is multiplexed by a wavelength channel and a spatial channel for communication, the scale of an optical fiber serving as a communication path can be reduced, and a large capacity Various data can be communicated with high efficiency.

Although it is now easy to adjust the output wavelength of the laser light source during the manufacturing process, it is difficult to freely change the output wavelength of the completed laser light source. A large number of laser light sources are required to output a large number of optical signals corresponding to a plurality of wavelength channels and a plurality of spatial channels.

In addition, since a laser light source and a drive circuit require maintenance work such as replacement, a general data communication system requires a large number of laser light sources corresponding to a plurality of wavelength channels and a plurality of spatial channels. The signal transmission units are individually provided, and a large number of optical fibers corresponding to a plurality of wavelength channels and a plurality of spatial channels are individually fixed to a large number of unit holding devices. The signal transmission unit is detachable.

[0013]

In the data communication system as described above, a large amount of various data can be communicated with high efficiency by multiplexing an optical signal with a wavelength channel and a spatial channel for communication. .

However, in the current data communication system,
Since the identifier of the wavelength channel or the space channel is not given to the optical signal, the wavelength channel or the space channel of the finally received optical signal cannot be confirmed.

For example, since a large number of signal transmission units individually correspond to a plurality of wavelength channels and a plurality of spatial channels, each of the number of signal transmission units can generate an identifier and assign it to an optical signal. Can be assumed. But,
As described above, a large number of signal transmission units are detachable from a large number of unit holding devices, and an optical fiber serving as a space channel is fixed to the unit holding device.
If the signal transmission unit is mounted on an inappropriate unit holding device, the identifier of the spatial channel will be output to the inappropriate spatial channel.

Therefore, it can be assumed that an identifier is generated in each of a large number of unit holding devices individually corresponding to a plurality of wavelength channels and a plurality of spatial channels and assigned to an optical signal. However, since the wavelength channel depends on the signal transmission unit, if the signal transmission unit is mounted on an inappropriate unit holding device, the identifier of the wavelength channel will be output to the inappropriate wavelength channel.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has a data communication system, a unit holding device, and a signal transmission unit capable of appropriately assigning an identifier of a wavelength channel and a spatial channel to an optical signal. , To provide.

[0018]

According to one aspect of the present invention, there is provided a data communication system comprising: a plurality of signal transmission units for individually outputting optical signals to a plurality of spatial channels; A plurality of space channel unit holding devices to be mounted, space selection means for selecting one from a plurality of space channel optical signals input from the plurality of unit holding devices, and light of one selected space channel In a data communication system comprising a signal receiving means for receiving a signal, the unit holding device,
Channel notifying means for generating an identifier of its own spatial channel and notifying the mounted signal transmitting unit of the signal, wherein the signal transmitting unit assigns the notified identifier to an output optical signal. Means.

Accordingly, optical signals are individually output to a plurality of spatial channels by a plurality of signal transmitting units individually mounted on a plurality of unit holding devices, and one of the optical signals of the plurality of spatial channels is selected by a spatial selecting means. Selected and received by the signal receiving means.

At this time, the channel notifying means of the unit holding device generates an identifier of the spatial channel and notifies the signal transmitting unit, and the identifier assigning means assigns the notified identifier to the optical signal output from the signal transmitting unit. , The signal receiving means receives the optical signal to which the spatial channel identifier is assigned.

The various means referred to in the present invention only need to be formed so as to realize their functions. For example, dedicated hardware, a computer in which an appropriate program is implemented by software, a combination thereof, and the like are used. Allow. Further, the identifier notified by the channel notifying unit of the unit holding device to the signal transmitting unit and the identifier assigned to the optical signal by the identifier assigning unit of the signal transmitting unit may be any data that can identify a spatial channel.

That is, since the data format does not need to be the same, for example, the channel notifying means generates an identifier as a specific potential, and the identifier providing means uses a code set in advance corresponding to the potential as the identifier. It is also possible to set it in the header of the optical signal. Note that a plurality of spatial channel unit holding devices means that a plurality of unit holding devices individually correspond to a plurality of spatial channels, and a plurality of signal transmission units for individually outputting optical signals to a plurality of spatial channels. Means that it is attached to

According to another data communication system of the present invention, there are provided a plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, and a plurality of wavelengths to which the plurality of signal transmission units are detachably attached individually. A channel unit holding unit, a wavelength multiplexing unit that multiplexes optical signals of a plurality of wavelength channels input from the plurality of unit holding units, and a multiplexed optical signal transmitted from the wavelength multiplexing unit. In a data communication system including a wavelength selection unit that selects an optical signal of one wavelength channel and a signal reception unit that receives an optical signal of the selected one wavelength channel, the signal transmission unit may include its own. An identifier assigning means for generating an identifier of the wavelength channel and assigning it to the output optical signal is provided.

Accordingly, the optical signals are individually output on a plurality of wavelength channels by a plurality of signal transmission units individually mounted on a plurality of unit holding devices, and multiplexed by wavelength multiplexing means. An optical signal of one wavelength channel is selected from the signals by the wavelength selecting means and received by the signal receiving means.

At this time, since the identifier assigning means assigns the wavelength channel identifier to the optical signal output from the signal transmitting unit, the signal receiving means receives the optical signal assigned with the wavelength channel identifier.

According to another data communication system of the present invention, there are provided a plurality of signal transmission units for individually outputting one optical signal of a plurality of wavelength channels to one of a plurality of spatial channels; A large number of unit holding devices freely mounted individually; a plurality of spatial multiplexing means for multiplexing a large number of optical signals of a plurality of wavelength channels input from the large number of the unit holding devices for each spatial channel; Space selection means for selecting one from a plurality of spatial channel optical signals individually transmitted from the spatial multiplexing means, and one of the selected one spatial channel wavelength channel multiplexed optical signal In a data communication system including a wavelength selection unit that selects an optical signal of a wavelength channel and a signal reception unit that receives one selected optical signal, The knit holding device includes channel notification means for generating an identifier of its own spatial channel and notifying the attached signal transmission unit, and the signal transmission unit generates an identifier of its own wavelength channel. An identifier assigning means for assigning to the optical signal output together with the identifier of the spatial channel notified from the unit holding device is provided.

Accordingly, a large number of optical signals are individually output to a plurality of spatial channels by a plurality of wavelength channels by a large number of signal transmitting units individually mounted on a large number of unit holding devices. Are multiplexed by the spatial multiplexing means for each spatial channel.

The optical signal of one spatial channel is selected by the spatial selecting means from the optical signals of the plurality of spatial channels in which the plurality of wavelength channels are multiplexed, and the optical signal in which the wavelength channel of the one spatial channel is multiplexed is selected. An optical signal of one wavelength channel is selected from the signals by the wavelength selecting means,
The optical signal of one wavelength channel of the one spatial channel is received by the signal receiving means.

At this time, the channel notifying means of the unit holding device generates an identifier of the spatial channel and notifies the signal transmitting unit, and the optical signal output from the signal transmitting unit is provided with the identifier of the spatial channel notified by the identifier assigning means. Since the identifier of the generated wavelength channel is assigned, the signal receiving unit receives the optical signal to which the identifier of the spatial channel and the identifier of the wavelength channel are assigned.

According to another data communication system of the present invention, there are provided a plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, and a plurality of wavelengths to which the plurality of signal transmission units are detachably attached. A channel unit holding unit, a wavelength multiplexing unit that multiplexes optical signals of a plurality of wavelength channels input from the plurality of unit holding units, and a multiplexed optical signal transmitted from the wavelength multiplexing unit. In a data communication system including a wavelength selecting unit that selects an optical signal of one wavelength channel and a signal receiving unit that receives an optical signal of the selected one wavelength channel, the unit holding device may include its own unit. Channel notifying means for generating an identifier of a wavelength channel and notifying the attached signal transmitting unit, wherein the signal transmitting unit is Corresponding to the identifier is notified of the wavelengths of the optical signal output is provided with a wavelength varying means for varying.

Accordingly, the optical signals are individually output on a plurality of wavelength channels by a plurality of signal transmitting units individually mounted on a plurality of unit holding devices, and multiplexed by wavelength multiplexing means. An optical signal of one wavelength channel is selected from the signals by the wavelength selecting means and received by the signal receiving means.

At this time, the channel notifying means of the unit holding device generates an identifier of the wavelength channel and notifies the signal transmitting unit, and the wavelength variable means sets the wavelength of the optical signal output from the signal transmitting unit to the notified identifier. Since the wavelength is changed correspondingly, the wavelength of the optical signal output from the unit holding device corresponds to the wavelength channel.

In another aspect of the data communication system as described above, the signal transmission unit includes an identifier assigning means for assigning the identifier of the wavelength channel notified from the unit holding device to the output optical signal. . Therefore, since the identifier assigning means assigns the identifier of the wavelength channel notified from the unit holding device to the optical signal output from the signal transmitting unit, the signal receiving means receives the optical signal to which the identifier of the wavelength channel is assigned. .

One unit holding device of the present invention includes a plurality of signal transmission units for individually outputting optical signals to a plurality of spatial channels, and a plurality of space where the plurality of signal transmission units are detachably mounted individually. Channel unit holding device, space selecting means for selecting one from a plurality of spatial channel optical signals input from the plurality of unit holding devices, and signal reception for receiving the selected one spatial channel optical signal And a channel notifying means for generating an identifier of its own spatial channel and notifying the attached signal transmitting unit.

Accordingly, as a data communication system, optical signals are individually output to a plurality of spatial channels by a plurality of signal transmitting units individually mounted on a plurality of unit holding devices, and the optical signals of the plurality of spatial channels are output from the optical signals. One is selected by the space selecting means and received by the signal receiving means.

At this time, the channel notifying means of the unit holding device generates the identifier of the spatial channel and notifies the signal transmitting unit. For example, if the notified identifier is added to the optical signal output from the signal transmitting unit, The signal receiving means receives the optical signal to which the identifier of the spatial channel is assigned.

One signal transmission unit of the present invention includes a plurality of signal transmission units for individually outputting optical signals to a plurality of spatial channels, and a plurality of space where the plurality of signal transmission units are detachably mounted individually. Channel unit holding device, space selecting means for selecting one from a plurality of spatial channel optical signals input from the plurality of unit holding devices, and signal reception for receiving the selected one spatial channel optical signal And a means for assigning the identifier of the spatial channel notified from the unit holding device to the output optical signal.

Therefore, as a data communication system, optical signals are individually output to a plurality of spatial channels by a plurality of signal transmitting units individually mounted on a plurality of unit holding devices. One is selected by the space selecting means and received by the signal receiving means.

At this time, if the unit holding unit notifies the signal transmitting unit of the identifier of the spatial channel, the identifier providing unit adds the notified identifier to the optical signal output from the signal transmitting unit. The optical signal to which the channel identifier is assigned is received.

Another signal transmission unit according to the present invention includes a plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, and a plurality of wavelengths to which the plurality of signal transmission units are detachably attached. A channel unit holding unit, a wavelength multiplexing unit that multiplexes optical signals of a plurality of wavelength channels input from the plurality of unit holding units, and a multiplexed optical signal transmitted from the wavelength multiplexing unit. In a data communication system including a wavelength selecting means for selecting an optical signal of one wavelength channel and a signal receiving means for receiving an optical signal of the selected one wavelength channel, an identifier of its own wavelength channel is generated. And an identifier assigning means for assigning to an optical signal outputted as a result.

Therefore, as a data communication system, optical signals are individually output on a plurality of wavelength channels by a plurality of signal transmission units individually mounted on a plurality of unit holding devices, and multiplexed by wavelength multiplexing means. An optical signal of one wavelength channel is selected from the multiplexed optical signal by the wavelength selecting means and received by the signal receiving means.

At this time, since the identifier assigning means assigns the wavelength channel identifier to the optical signal output from the signal transmitting unit, the signal receiving means receives the optical signal assigned with the wavelength channel identifier.

Another signal transmitting unit according to the present invention comprises a plurality of signal transmitting units for individually outputting one optical signal of a plurality of wavelength channels to one of a plurality of spatial channels, and a plurality of said signal transmitting units are detachable. A large number of unit holding devices freely mounted individually, and a plurality of spatial multiplexing means for multiplexing a large number of optical signals of a plurality of wavelength channels inputted from the large number of the unit holding devices for each spatial channel,
A spatial selecting means for selecting one from a plurality of spatial channel optical signals individually transmitted from the plurality of spatial multiplexing means; and a one from a selected one spatial channel wavelength channel multiplexed optical signal. In a data communication system comprising wavelength selecting means for selecting an optical signal of one wavelength channel and signal receiving means for receiving one selected optical signal, the unit generates an identifier of its own wavelength channel, and An identifier assigning means for assigning to the optical signal output together with the identifier of the spatial channel notified from the holding device is provided.

Accordingly, in the data communication system, a large number of optical signals are individually output to a plurality of spatial channels by a plurality of wavelength channels by a plurality of signal transmission units individually mounted on a plurality of unit holding devices. A plurality of wavelength channels of a large number of optical signals are multiplexed by spatial multiplexing means for each spatial channel.

An optical signal of one spatial channel is selected by the spatial selecting means from the optical signals of the plurality of spatial channels in which the plurality of wavelength channels are multiplexed, and the optical signal in which the wavelength channel of the one spatial channel is multiplexed is selected. An optical signal of one wavelength channel is selected from the signals by the wavelength selecting means,
The optical signal of one wavelength channel of the one spatial channel is received by the signal receiving means.

At this time, if the unit holding device generates a spatial channel identifier and notifies the signal transmitting unit,
Since the identifier assigning means assigns the identifier of the notified spatial channel and the identifier of the wavelength channel to be generated to the optical signal output from the signal transmitting unit, the signal receiving means is assigned the identifiers of the spatial channel and the wavelength channel, respectively. The received optical signal will be received.

Another unit holding apparatus according to the present invention includes a plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, and a plurality of wavelengths to which the plurality of signal transmission units are detachably attached. A channel unit holding unit, a wavelength multiplexing unit that multiplexes optical signals of a plurality of wavelength channels input from the plurality of unit holding units, and a multiplexed optical signal transmitted from the wavelength multiplexing unit. In a data communication system including a wavelength selecting means for selecting an optical signal of one wavelength channel and a signal receiving means for receiving an optical signal of the selected one wavelength channel, an identifier of its own wavelength channel is generated. Channel notifying means for notifying the signal transmission unit mounted as such.

Therefore, as a data communication system, optical signals are individually output on a plurality of wavelength channels by a plurality of signal transmission units individually mounted on a plurality of unit holding devices, and multiplexed by wavelength multiplexing means. An optical signal of one wavelength channel is selected from the multiplexed optical signal by the wavelength selecting means and received by the signal receiving means.

At this time, the channel notifying means of the unit holding device generates the identifier of the wavelength channel and notifies the signal transmitting unit of the wavelength. For example, the wavelength of the optical signal output from the signal transmitting unit corresponds to the notified identifier. Then, the wavelength of the optical signal output from the unit holding device corresponds to the wavelength channel.

Another signal transmission unit according to the present invention comprises a plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, and a plurality of wavelengths to which the plurality of signal transmission units are detachably attached. A channel unit holding unit, a wavelength multiplexing unit that multiplexes optical signals of a plurality of wavelength channels input from the plurality of unit holding units, and a multiplexed optical signal transmitted from the wavelength multiplexing unit. In a data communication system including a wavelength selecting unit that selects an optical signal of one wavelength channel and a signal receiving unit that receives an optical signal of the selected one wavelength channel, a wavelength of an optical signal to be output is determined. There is provided a wavelength variable unit that varies according to the identifier notified from the unit holding device.

Therefore, as a data communication system, optical signals are individually output on a plurality of wavelength channels by a plurality of signal transmission units individually mounted on a plurality of unit holding devices, and multiplexed by wavelength multiplexing means. An optical signal of one wavelength channel is selected from the multiplexed optical signal by the wavelength selecting means and received by the signal receiving means.

At this time, if the unit holding device generates the identifier of the wavelength channel and notifies the signal transmitting unit,
Since the wavelength of the optical signal output from the signal transmission unit is changed according to the identifier notified by the wavelength changing unit, the wavelength of the optical signal output from the unit holding device corresponds to the wavelength channel.

Another aspect of the signal transmission unit as described above is to include an identifier assigning means for assigning the wavelength channel identifier notified from the unit holding device to the output optical signal. Therefore, since the identifier assignment unit assigns the identifier of the wavelength channel notified from the unit holding device to the optical signal output by the signal transmission unit,
The signal receiving means receives an optical signal to which a wavelength channel identifier is assigned.

[0054]

FIG. 1 shows a first embodiment of the present invention.
This will be described below with reference to FIG. FIG. 1 is a schematic diagram illustrating a main part of a data transmission device of the data communication system according to the present embodiment, and FIG. 2 is a schematic diagram illustrating the entire data communication system.

The data communication system 1 according to the present embodiment
As shown in FIG. 2, one data transmission device 2 and one data reception device 3 are provided.
Are connected by one fiber array 4 serving as a data communication path. In the following, in this embodiment, for simplicity of description, the data communication system 1 corresponds to four wavelength channels and three spatial channels, and multiplexes these channels into one each to convert an optical signal into a data signal. Shall communicate.

The data communication device 2 has twelve transmission cards 11 as a number of signal transmission units, and these twelve transmission cards 11 transmit one optical signal of four wavelength channels to three. Output individually to one of the three spatial channels. Further, the data communication apparatus 2 includes three transmission shelves 12 respectively corresponding to three spatial channels, and each of the four transmission shelves 12 has four transmission shelves as shown in FIG. Four mounting slots 13 respectively corresponding to the wavelength channels are provided.

A total of twelve mounting slots 13 function as a unit holding device, and twelve transmission cards 11 are individually and removably mounted in these twelve mounting slots 13. . Three optical fibers 14 are individually mounted in three mounting slots 13 of the four transmission shelves 12, and these three optical fibers 14 are assembled as a single fiber array 15. Therefore, four fiber arrays 15 are individually connected to the four transmission shelves 12.

Four star couplers 16 are individually connected to the four fiber arrays 15 as spatial multiplexing means, and each of the four star couplers 16 is connected to the three optical fibers 14. The optical signals of the four wavelength channels input individually are multiplexed into one. Since the four star couplers 16 individually output one optical signal to three optical fibers 17 of one fiber array 4,
Here, three optical signals in which four wavelength channels are multiplexed are individually transmitted through the optical fiber 17 of three spatial channels.

The optical signal output from the data transmission device 2 having the above-described structure to the fiber array 4 is transmitted through the fiber array 4 and input to the data reception device 3. The data receiving device 3 includes one optical switch 18 as a space selecting means, and the three optical fibers 17 of the fiber array 4 are connected to the one optical switch 18.

The optical switch 18 selects one of the three spatial channel optical signals individually input from the three optical fibers 17, and selects one spatial channel in which the four wavelength channels are multiplexed. Is output to the optical filter 19 which is one wavelength selecting means.

When an optical signal of one spatial channel in which wavelength channels are multiplexed is input, the optical filter 19 selects an optical signal of one wavelength channel from the optical signal, and selects a signal receiving unit 20 as signal receiving means. Output to The signal receiving unit 20 includes a photoelectric conversion element, a microcomputer, and the like (not shown), converts an input optical signal into an electric signal, and executes various data processing.

In the data communication system 1 according to the present embodiment, as shown in FIG. 1, each of the mounting slots 13 of the transmission shelf 12 is provided with an identifier generation unit 2 serving as a channel notification unit.
1. Each of the transmission cards 11 includes an identifier detecting unit 22 and an identifier adding unit 23 corresponding to an identifier providing unit, and a signal transmitting unit 2 serving as a signal output unit.
4 is provided. The signal transmission unit 24 includes, for example,
It has an external input terminal, a laser drive circuit, a high-speed modulation circuit, a semiconductor laser light source, and the like (not shown), and outputs an optical signal by laser light in response to an external input.

The identifier generating section 21 of the mounting slot 13
Has, for example, a power supply circuit and a resistance element,
A specific potential is generated as an identifier corresponding to the spatial channel. In the present embodiment, since the three transmission shelves 12 individually correspond to three spatial channels, twelve identifier generating sections 21 correspond to the transmission shelves 12 and have four potential levels. Generate one of

The identifier detecting section 22 of the transmission card 11
Means, for example, A / DC (Analog / Digital Converter)
r) and a microcomputer in which an appropriate control program is mounted in advance.
3 to control the operation of the identifier adding section 23 by determining the spatial channel from the potential notified as an identifier. The identifier adding section 23 includes a subcarrier multiplexing modulation circuit and the like, and adds an identifier of a spatial channel to the optical signal output from the signal transmitting section 24 in accordance with the operation control of the identifier detecting section 22.

A data communication method using the data communication system 1 of the present embodiment in the above configuration will be described below. First, three transmission shelves 12 individually correspond to three spatial channels, and each of the four mounting slots 13 individually corresponds to four wavelength channels. In each of the mounting slots 13, twelve transmission cards 11 corresponding to three spatial channels and four wavelength channels are individually mounted.

When the twelve transmitting cards 11 mounted on the three transmitting shelves 12 four by four respectively output optical signals corresponding to three spatial channels and four wavelength channels, respectively, Twelve optical signals are twelve optical fibers 1
4, the signal is transmitted to three star couplers 16, and the three star couplers 16 multiplex wavelength channels for each spatial channel.

The optical signals of the three spatial channels in which the four wavelength channels are multiplexed are individually transmitted from the data transmitting device 2 to the data receiving device 3 by three optical fibers 17, and are transmitted by one optical switch 18. An optical signal of one spatial channel is selected. Since four wavelength channels are multiplexed in one spatial channel selected in this way, an optical signal of one wavelength channel is selected by the optical filter 19 from this optical signal.

Since the optical signal of one wavelength channel of this one spatial channel is received by the signal receiving unit 20,
The signal receiving section 20 converts an optical signal into an electric signal and executes various data processing. However, in the data communication system 1 of the present embodiment, since the identifier of the spatial channel is assigned to the optical signal communicated as described above, the data receiving device 3 detects the spatial channel from the received optical signal. Can be.

More specifically, when the transmission card 11 is mounted in the mounting slot 13 of the transmission shelf 12, the identifier generation unit 21
Applies a specific potential to the transmitting card 11 as an identifier of the spatial channel. In the transmission card 11, the identifier detecting unit 22 determines the spatial channel from the potential and controls the operation of the identifier adding unit 23, so that the identifier adding unit 23 adds the identifier of the spatial channel to the optical signal output from the signal transmitting unit 24. Give.

In the data communication system 1 of the present embodiment, the correspondence between the space channel and the mounting slot 13 of the transmission shelf 12 is fixed, and the transmitting card 11 identifies the identifier of the space channel generated by the mounting slot 13. Since the transmission channel 11 is assigned to the optical signal, for example, it is possible to assign the identifier of the spatial channel to an appropriate optical signal, regardless of which slot 13 the transmission card 11 is attached to.

The present invention is not limited to the above-described embodiment, but allows various modifications without departing from the gist of the present invention. For example, in the above embodiment, to simplify the description,
The transmission shelf 12 and the spatial channel correspond to each other one by one, but such a correspondence is not necessary in an actual system, and if an appropriate spatial channel corresponds to a predetermined mounting slot 13 as necessary. good.

In the above embodiment, the data communication system 1 corresponding to a plurality of spatial channels and a plurality of wavelength channels
In the above, an example of assigning an identifier of a spatial channel to an optical signal has been described. For example, in a data communication system (not shown) corresponding to a single wavelength channel and a plurality of spatial channels, as described above, It is also possible to assign an identifier to the optical signal.

Further, in the above-described embodiment, an example is described in which the identifier adding section 23 of the transmission card assigns an identifier to an optical signal using a subcarrier multiplexing modulation circuit. It is also possible to add an identifier or an identifier to a high-speed signal using a MAX circuit.

In the above embodiment, a large number of mounting slots 1
3 is provided with the identifier generation unit 21 as dedicated hardware.
It is also possible to connect a single host computer to the host computer, and to control and generate the identifiers of a large number of mounting slots 13 by this host computer.

Further, in the above embodiment, the star coupler 16 multiplexes optical signals of four wavelength channels into one and outputs the multiplexed optical signal to one optical fiber 17.
It is also possible to multiplex the optical signals of the four wavelength channels into one and output them to each of the four optical fibers.

Next, a second embodiment of the present invention will be described below with reference to FIG. In the second embodiment illustrated here, the same portions as those in the first embodiment described above are denoted by the same names and reference numerals, and detailed description thereof is omitted.

First, the data communication system (not shown) of the present embodiment also supports four wavelength channels and three spatial channels, and has twelve transmission cards 31 and twelve mounting slots. 32 are detachably mounted individually. The mounting slot 32 is provided for the identifier generating unit 2.
1, the transmission card 31 includes an identifier generating unit 33 and an identifier adding unit 23 corresponding to an identifier providing unit.

The identifier generating section 33 includes, for example, a microcomputer in which an appropriate control program is mounted in advance, and the identifier adding section 23 corresponds to the wavelength channel identifier set in advance. Control the operation. The identifier adding section 23 includes a subcarrier multiplex modulation circuit and the like, and adds an identifier of a wavelength channel to the optical signal output from the signal transmitting section 24 in accordance with the operation control of the identifier generating section 33.

In the above-described configuration, in the data communication system of the present embodiment, the identifier of the wavelength channel is added to the optical signal to be communicated, so that the data receiving device 3 detects the wavelength channel of the received optical signal. Can be. The wavelength channel depends on the transmission card 31, and the transmission card 31 generates an identifier of its own wavelength channel and gives it to the optical signal. For example, even if the transmission card 31 is mounted in any of the mounting slots 32, It is possible to assign the wavelength channel identifier to an appropriate optical signal.

The present invention is not limited to the above-described embodiment, but allows various modifications without departing from the gist of the present invention. For example, in the above embodiment, in a data communication system corresponding to a plurality of spatial channels and a plurality of wavelength channels, an example is given in which an identifier of a wavelength channel is assigned to an optical signal. In a data communication system (not shown) corresponding to a channel, it is also possible to assign an identifier of a wavelength channel to an optical signal as described above.

In the data communication system corresponding to a plurality of spatial channels and a plurality of wavelength channels as described above, the wavelength channel and the spatial channel are integrated by integrating the first and second embodiments. It is also possible to add both of the identifiers to the optical signal.

Next, a third embodiment of the present invention will be described below with reference to FIG. In the third embodiment illustrated here, the same portions as those in the first embodiment described above are denoted by the same names and reference numerals, and detailed description thereof will be omitted.

First, the data communication system (not shown) of the present embodiment also supports four wavelength channels and three spatial channels, and has twelve transmission cards 41 and twelve mounting slots. 42, each of which is detachably mounted. The mounting slot 42 includes an identifier generating unit 43 as a channel notifying unit. The identifier generating unit 43 notifies the transmitting card 42 of an identifier of a wavelength channel instead of a spatial channel.

The transmission card 42 has an identifier detecting section 44 and an identifier adding section 45 as identifier assigning means. The identifier adding section 45 is connected to the signal transmitting section 46. The output wavelength of the laser light source of the signal transmission unit 46 is variable, and a wavelength setting unit 47 as a wavelength variable unit is connected to the signal transmission unit 46 and the identifier detection unit 44.

The identifier detecting section 44 includes a microcomputer or the like in which an appropriate control program is mounted in advance. The identifier detecting section 44 determines a wavelength channel from the identifier notified from the mounting slot 42, and
The operation of the wavelength setting unit 47 is controlled. The identifier adding section 45 includes a subcarrier multiplex modulation circuit and the like, and adds an identifier of a wavelength channel to the optical signal output from the signal transmitting section 46 in accordance with the operation control of the identifier detecting section 44. The wavelength setting unit 47 includes a microcomputer or the like, and performs operation control corresponding to the identifier of the wavelength channel of the identifier detection unit 44, so that the wavelength of the optical signal output from the signal transmission unit 46 corresponds to the wavelength channel. Variable.

In this embodiment, since the twelve mounting slots 42 correspond to four wavelength channels and three spatial channels, the identifier generating unit 43 has the same configuration as one spatial channel. An identifier is generated so that a wavelength channel does not occur. That is, the four identifier generators 43 provided in each of the three transmission shelves generate identifiers of four wavelength channels one by one.

In the above-described configuration, in the data communication system of this embodiment, the transmission card 41 changes the wavelength of the optical signal in accordance with the identifier of the wavelength channel generated by the mounting slot 42, Since the identifier of the wavelength channel is assigned to any one of the mounting slots 42, for example, the identifier of the wavelength channel can be assigned to an appropriate optical signal, regardless of which mounting slot 42 the transmission card 41 is attached to.

[0088]

Since the present invention is configured as described above, it has the following effects.

The data communication system according to the first aspect of the present invention includes a plurality of signal transmission units for individually outputting optical signals to a plurality of spatial channels, and a plurality of the plurality of signal transmission units which are detachably mounted individually. And a space selection unit for selecting one from a plurality of spatial channel optical signals input from the plurality of unit holding devices, and receiving the selected one spatial channel optical signal. In a data communication system comprising signal receiving means, the unit holding device comprises a channel notifying means for generating an identifier of its own spatial channel and notifying the mounted signal transmitting unit,
The signal transmitting unit includes an identifier assigning unit that assigns the notified identifier to the output optical signal, so that the signal transmitting unit assigns the identifier of the spatial channel generated by the unit holding device to the optical signal. Therefore, even if the signal transmission unit is erroneously attached to any unit holding device, it is possible to appropriately assign the spatial channel identifier to the optical signal.

The data communication system according to the second aspect of the present invention provides a plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, and a plurality of the plurality of signal transmission units detachably mounted individually. A wavelength channel unit holding device, wavelength multiplexing means for multiplexing optical signals of a plurality of wavelength channels input from the plurality of unit holding devices, and multiplexed light transmitted from the wavelength multiplexing device. In a data communication system including a wavelength selection unit that selects an optical signal of one wavelength channel from a signal and a signal reception unit that receives an optical signal of the selected one wavelength channel, the signal transmission unit includes: The provision of the identifier assigning means for generating the identifier of its own wavelength channel and assigning it to the output optical signal allows the signal transmitting unit to Because generates a channel identifier given to the optical signal, even if the signal transmission unit is mounted erroneously in any of the unit holding device can be properly imparting identifier of wavelength channels in the optical signal.

A data communication system according to a third aspect of the present invention includes a plurality of signal transmission units for individually outputting one optical signal of a plurality of wavelength channels to one of a plurality of spatial channels, and a plurality of the signal transmission units. A large number of unit holding devices, each of which is detachably mounted, and a plurality of spatial multiplexing means for multiplexing a large number of optical signals of a plurality of wavelength channels inputted from the large number of the unit holding devices for each spatial channel. A space selection unit that selects one from a plurality of spatial channel optical signals individually transmitted from the plurality of spatial multiplexing units, and a selected one spatial channel wavelength channel multiplexed optical signal. In a data communication system including a wavelength selecting unit for selecting an optical signal of one wavelength channel and a signal receiving unit for receiving the selected one optical signal. Wherein the unit holding device includes channel notifying means for generating an identifier of its own spatial channel and notifying the mounted signal transmitting unit, and the signal transmitting unit generates its own wavelength channel identifier. And an identifier assigning means for assigning to the optical signal outputted together with the identifier of the spatial channel notified from the unit holding device, so that the signal transmitting unit outputs the identifier of the spatial channel generated by the unit holding device to the optical In addition to the signal transmission unit, the signal transmission unit generates an identifier of the wavelength channel and adds the identifier to the optical signal. And the same wavelength channel coexist in one spatial channel. It is possible to prevent that.

A data communication system according to a fourth aspect of the present invention includes a plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, and a plurality of the plurality of signal transmission units detachably mounted individually. A wavelength channel unit holding device, wavelength multiplexing means for multiplexing optical signals of a plurality of wavelength channels input from the plurality of unit holding devices, and multiplexed light transmitted from the wavelength multiplexing device. In a data communication system including a wavelength selection unit that selects an optical signal of one wavelength channel from a signal and a signal reception unit that receives an optical signal of the selected one wavelength channel, the unit holding device includes: Channel notifying means for generating an identifier of its own wavelength channel and notifying the attached signal transmitting unit of the signal transmission unit; The unit is provided with wavelength variable means for changing the wavelength of the output optical signal in accordance with the notified identifier, so that the signal transmitting unit can correspond to the identifier of the wavelength channel generated by the unit holding device. Varies the wavelength of the optical signal, so that the optical signal can be output at an appropriate wavelength even if the signal transmission unit is erroneously attached to any unit holding device.

According to a fifth aspect of the present invention, in the data communication system according to the fourth aspect, the signal transmission unit assigns the identifier of the wavelength channel notified from the unit holding device to the output optical signal. With the provision of the means, since the signal transmission unit assigns the identifier of the wavelength channel generated by the unit holding device to the optical signal, even if the signal transmission unit is erroneously attached to any unit holding device, The wavelength channel identifier can be appropriately assigned.

According to a sixth aspect of the present invention, there is provided a unit holding apparatus comprising: a plurality of signal transmission units for individually outputting optical signals to a plurality of spatial channels; and a plurality of the plurality of signal transmission units detachably mounted individually. And a space selection unit for selecting one from a plurality of spatial channel optical signals input from the plurality of unit holding devices, and receiving the selected one spatial channel optical signal. In a data communication system including a signal receiving unit, the unit holding device is provided with a channel notifying unit that generates an identifier of its own spatial channel and notifies the mounted signal transmitting unit of the identifier. Since the signal identifier is generated and notified to the signal transmitting unit, the signal transmitting unit converts the spatial channel identifier into an optical signal. Kumisure words, even if the signal transmission unit is mounted erroneously in any of the unit holding device can be properly imparting identifier spatial channel to an optical signal.

A signal transmitting unit according to a seventh aspect of the present invention includes a plurality of signal transmitting units for individually outputting optical signals to a plurality of spatial channels, and a plurality of the signal transmitting units to which the plurality of signal transmitting units are detachably attached. And a space selection unit for selecting one from a plurality of spatial channel optical signals input from the plurality of unit holding devices, and receiving the selected one spatial channel optical signal. In a data communication system including signal receiving means, the identifier holding means for giving the identifier of the spatial channel notified from the unit holding device to the output optical signal is provided, so that the unit holding device If the identifier of the spatial channel is notified, the signal transmitting unit adds the notified identifier to the optical signal. It is mounted erroneously in any of the unit holding device can be properly imparting identifier spatial channel to an optical signal.

The signal transmission unit according to the invention of claim 8 includes a plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, and a plurality of signal transmission units to which the plurality of signal transmission units are detachably attached. A wavelength channel unit holding device, wavelength multiplexing means for multiplexing optical signals of a plurality of wavelength channels input from the plurality of unit holding devices, and multiplexed light transmitted from the wavelength multiplexing device. In a data communication system comprising a wavelength selecting means for selecting an optical signal of one wavelength channel from signals and a signal receiving means for receiving an optical signal of the selected one wavelength channel, an identifier of its own wavelength channel is used. The signal transmission unit generates the identifier of the wavelength channel by providing the Since imparting to an optical signal, even if the signal transmission unit is mounted erroneously in any of the unit holding device,
It is possible to appropriately assign the wavelength channel identifier to the optical signal.

According to a ninth aspect of the present invention, there are provided a plurality of signal transmission units for individually outputting one optical signal of a plurality of wavelength channels to one of a plurality of spatial channels, and a plurality of the signal transmission units. A large number of unit holding devices, each of which is detachably mounted, and a plurality of spatial multiplexing means for multiplexing a large number of optical signals of a plurality of wavelength channels inputted from the large number of the unit holding devices for each spatial channel. A space selection unit that selects one from a plurality of spatial channel optical signals individually transmitted from the plurality of spatial multiplexing units, and a selected one spatial channel wavelength channel multiplexed optical signal. In a data communication system comprising: a wavelength selecting unit that selects an optical signal of one wavelength channel; and a signal receiving unit that receives one selected optical signal. The signal transmission unit is provided with an identifier assigning means for generating an identifier of its own wavelength channel and assigning the identifier to the optical signal output together with the identifier of the spatial channel notified from the unit holding device. Is generated and assigned to the optical signal, and if the identifier of the spatial channel is notified from the unit holding device, the identifier of the spatial channel is also assigned to the optical signal, so that the signal transmission unit is erroneously attached to any unit holding device. However, it is possible to appropriately assign identifiers of the spatial channel and the wavelength channel to the optical signal.

According to a tenth aspect of the present invention, there is provided a unit holding apparatus comprising: a plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels; A wavelength channel unit holding device, wavelength multiplexing means for multiplexing optical signals of a plurality of wavelength channels input from the plurality of unit holding devices, and multiplexed light transmitted from the wavelength multiplexing device. In a data communication system comprising a wavelength selecting means for selecting an optical signal of one wavelength channel from signals and a signal receiving means for receiving an optical signal of the selected one wavelength channel, an identifier of its own wavelength channel is used. Channel notifying means for notifying the attached signal transmission unit by generating the Is notified to the signal transmission unit, so that if the signal transmission unit changes the wavelength of the optical signal in accordance with the notified identifier, the signal transmission unit can be mounted in any unit holding device, and The signal can be output at an appropriate wavelength.

The signal transmission unit according to the invention of claim 11 includes a plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, and a plurality of signal transmission units to which the plurality of signal transmission units are detachably attached. A wavelength channel unit holding device, wavelength multiplexing means for multiplexing optical signals of a plurality of wavelength channels input from the plurality of unit holding devices, and multiplexed light transmitted from the wavelength multiplexing device. In a data communication system including a wavelength selection unit that selects an optical signal of one wavelength channel from signals and a signal reception unit that receives an optical signal of the selected one wavelength channel, By providing wavelength changing means for changing the wavelength in accordance with the identifier notified from the unit holding device, the wavelength chain can be transmitted from the unit holding device. If the identifier of the channel is notified, the signal transmission unit changes the wavelength of the optical signal in accordance with the notified identifier. Therefore, even if the signal transmission unit is erroneously attached to any unit holding device, the optical signal can be properly transmitted. It can output in wavelength.

According to a twelfth aspect of the present invention, there is provided the signal transmitting unit according to the eleventh aspect, further comprising an identifier assigning means for assigning the wavelength channel identifier notified from the unit holding device to the output optical signal. Therefore, if the identifier of the wavelength channel is notified from the unit holding device, the signal transmitting unit adds the notified identifier to the optical signal. Therefore, even if the signal transmitting unit is erroneously attached to any unit holding device, The wavelength channel identifier can be appropriately assigned to the signal.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a main part of a data transmission device of a data communication system according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing the entire data communication system.

FIG. 3 is a schematic diagram illustrating a main part of a data transmission device according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating a main part of a data transmission device according to a third embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 data communication system 2 data transmission device 3 data reception device 4 fiber array 11 transmission card as signal transmission unit 12 transmission shelf 13 mounting slot as unit holding device 14 optical fiber 15 fiber array 16 star coupler as spatial multiplexing means 17 Optical fiber 18 Optical switch which is space selecting means 19 Optical filter which is wavelength selecting means 20 Signal receiving part which is signal receiving means 21 Identifier generating part which is channel notifying means 22 Identifier detecting part 23 Identifier adding part 24 Signal transmitting part 31 Signal Transmitting card which is a transmitting unit 32 Mounting slot which is a unit holding device 33 Identifier generating unit 41 Transmitting card which is a signal transmitting unit 42 Mounting slot which is a unit holding device 43 Identifier generating unit which is a channel notification means 44 Identifier detecting unit 5 Wavelength setting unit is the identifier adding unit 46 signal transmitting section 47 wavelength-tunable means

Continued on the front page (72) Inventor Haruo Endo 2-4-8 Daiba, Minato-ku, Tokyo Inside Fuji Television Corporation

Claims (12)

[Claims] A plurality of signal transmission units for individually outputting optical signals to a plurality of spatial channels; a plurality of spatial channel unit holding devices to which the plurality of signal transmission units are detachably mounted individually; Data comprising: space selecting means for selecting one from a plurality of spatial channel optical signals input from the unit holding device; and signal receiving means for receiving the selected one spatial channel optical signal. In the communication system, the unit holding device includes channel notifying means for generating an identifier of its own spatial channel and notifying the attached signal transmitting unit, and the signal transmitting unit outputs the notified identifier. A data communication system comprising an identifier assigning means for assigning to an output optical signal. 2. A plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, a unit holding device for a plurality of wavelength channels to which the plurality of signal transmission units are detachably mounted individually, and Wavelength multiplexing means for multiplexing optical signals of a plurality of wavelength channels input from the unit holding device, and an optical signal of one wavelength channel from the multiplexed optical signals transmitted from the wavelength multiplexing means. In a data communication system including a wavelength selecting unit to select and a signal receiving unit to receive an optical signal of one selected wavelength channel, the signal transmission unit generates an identifier of its own wavelength channel. A data communication system comprising an identifier assigning means for assigning to an output optical signal. 3. A large number of signal transmission units for individually outputting one optical signal of a plurality of wavelength channels to one of a plurality of spatial channels, and a large number of said signal transmission units detachably mounted individually. A plurality of unit holding devices, a plurality of spatial multiplexing means for multiplexing a large number of optical signals of a plurality of wavelength channels input from a large number of the unit holding devices for each spatial channel, Space selecting means for selecting one from a plurality of spatial channel optical signals transmitted to a plurality of spatial channels, and selecting one wavelength channel optical signal from the multiplexed optical signal of the selected one spatial channel wavelength channel. In a data communication system including a wavelength selection unit and a signal reception unit that receives one selected optical signal, the unit holding device may be configured to use its own space channel. Channel notifying means for generating an identifier of a channel and notifying the attached signal transmitting unit, wherein the signal transmitting unit generates an identifier of its own wavelength channel and is notified from the unit holding device. A data communication system comprising an identifier assigning means for assigning an optical signal output together with an identifier of a spatial channel. 4. A plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, a unit holding device for a plurality of wavelength channels to which the plurality of signal transmission units are detachably mounted individually, Wavelength multiplexing means for multiplexing optical signals of a plurality of wavelength channels input from the unit holding device, and an optical signal of one wavelength channel from the multiplexed optical signals transmitted from the wavelength multiplexing means. In a data communication system including a wavelength selection unit to select and a signal reception unit to receive an optical signal of one selected wavelength channel, the unit holding device generates an identifier of its own wavelength channel. Channel notifying means for notifying the attached signal transmitting unit, the signal transmitting unit notifying the wavelength of the output optical signal. Data communication system characterized in that it comprises a tunable means for varying in response to the identifier. 5. The data communication according to claim 4, wherein the signal transmitting unit includes an identifier assigning means for assigning the wavelength channel identifier notified from the unit holding device to the output optical signal. system. 6. A plurality of signal transmission units for individually outputting optical signals to a plurality of spatial channels, a plurality of spatial channel unit holding devices on which the plurality of signal transmission units are detachably mounted, respectively. Data comprising: space selecting means for selecting one from a plurality of spatial channel optical signals input from the unit holding device; and signal receiving means for receiving the selected one spatial channel optical signal. In a communication system, a unit holding device characterized by comprising channel notifying means for generating an identifier of its own spatial channel and notifying the signal transmitting unit attached thereto. 7. A plurality of signal transmission units for individually outputting optical signals to a plurality of spatial channels, a plurality of spatial channel unit holding devices to which the plurality of signal transmission units are detachably mounted individually, Data comprising: space selecting means for selecting one from a plurality of spatial channel optical signals input from the unit holding device; and signal receiving means for receiving the selected one spatial channel optical signal. In the communication system, a signal transmission unit comprising an identifier assigning unit that assigns an identifier of a spatial channel notified from the unit holding device to an output optical signal. 8. A plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, a plurality of wavelength channel unit holding devices to which the plurality of signal transmission units are detachably attached individually, Wavelength multiplexing means for multiplexing optical signals of a plurality of wavelength channels input from the unit holding device, and an optical signal of one wavelength channel from the multiplexed optical signals transmitted from the wavelength multiplexing means. In a data communication system comprising a wavelength selecting means for selecting and a signal receiving means for receiving an optical signal of one selected wavelength channel, an optical signal generated by generating an identifier of its own wavelength channel is output. A signal transmission unit comprising an identifier assigning means for assigning. 9. A plurality of signal transmission units for individually outputting one optical signal of a plurality of wavelength channels to one of a plurality of spatial channels, and a plurality of said plurality of signal transmission units detachably mounted individually. A plurality of unit holding devices, a plurality of spatial multiplexing means for multiplexing a large number of optical signals of a plurality of wavelength channels input from a large number of the unit holding devices for each spatial channel, and a plurality of spatial multiplexing means. Space selecting means for selecting one from a plurality of spatial channel optical signals transmitted to a plurality of spatial channels, and selecting one wavelength channel optical signal from the multiplexed optical signal of the selected one spatial channel wavelength channel. In a data communication system comprising wavelength selecting means and signal receiving means for receiving one selected optical signal, generating an identifier of its own wavelength channel Signal transmission unit, characterized in that it comprises an identifier adding means for adding the optical signal output together with the identifier of the notified spatial channel from serial unit holding device. 10. A plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, a unit holding device for a plurality of wavelength channels to which a plurality of said signal transmission units are detachably mounted individually, Wavelength multiplexing means for multiplexing optical signals of a plurality of wavelength channels input from the unit holding device, and an optical signal of one wavelength channel from the multiplexed optical signals transmitted from the wavelength multiplexing means. In a data communication system comprising a wavelength selecting means for selecting and a signal receiving means for receiving an optical signal of the selected one wavelength channel, the signal transmission mounted by generating an identifier of its own wavelength channel. A unit holding device comprising a channel notifying unit for notifying a unit. 11. A plurality of signal transmission units for individually outputting optical signals on a plurality of wavelength channels, a unit holding device for a plurality of wavelength channels to which the plurality of signal transmission units are detachably attached individually, and Wavelength multiplexing means for multiplexing optical signals of a plurality of wavelength channels input from the unit holding device, and an optical signal of one wavelength channel from the multiplexed optical signals transmitted from the wavelength multiplexing means. In a data communication system including a wavelength selecting unit to select and a signal receiving unit to receive an optical signal of the selected one wavelength channel, a wavelength of an output optical signal is notified from the unit holding device. A signal transmission unit comprising a wavelength variable unit that varies according to an identifier. 12. The signal transmitting unit according to claim 11, further comprising an identifier assigning means for assigning an identifier of the wavelength channel notified from the unit holding device to the output optical signal.