JPH066844A - Wavelength division multiplexing optical cross-connect switch device - Google Patents

Abstract

(57) [Abstract] [Purpose] A single optical cross-connect switch directly cross-connects a plurality of types of optical signals that are wavelength division multiplexed and have widely different wavelength bands. [Structure] The input wavelength division multiplexed optical signal is split into optical signals of each wavelength by a broadband wavelength demultiplexer, and cross-linking of the broadband optical signal is performed using a spatial switch and a wavelength converter. A plurality of optical signals are contained in the optical signal. A narrow band optical signal is extracted from the space switch, and the narrow band wavelength converter performs wavelength conversion of each optical signal. After the wavelength conversion, the space switch again allocates the light to each output port, so that the narrow band optical signal is cross-connected.
In other words, one device is used to cross-connect a wideband optical signal and a plurality of narrowband optical signals included in the wideband.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wavelength division multiplex cross-connect switch for cross-connecting two types of optical signals which are wavelength division multiplexed and have different wavelength bands as optical signals.

[0002]

2. Description of the Related Art If a network is constructed using optical wavelength division multiplexing technology, the transmission capacity can be dramatically increased. In order to realize this, an optical wavelength division multiplexing cross-connect switch that cross-connects multiplexed optical signals is required. FIG. 5 shows a conventional configuration of a wavelength division multiplexing cross-connect switch for cross-connecting multiplexed optical signals.

In FIG. 5, three-wavelength multiplexed optical signals are input from the input ports 501 to 503. The input optical signals of three wavelengths are separated into optical signals of wavelengths λ1 to λ3 by the wavelength demultiplexers 511 to 513, respectively. The separated optical signals are distributed to the wavelength converters 531 to 539 by the space switch 521. Each separated optical signal enters a wavelength converter connected to the output port. Each wavelength converter has a function of converting an input optical signal into a wavelength output from the cross connect switch. The respective wavelength converters are wavelength converters 531, 534, 5
37 is the wavelength λ1, wavelength converters 532, 535 and 538 are the wavelength λ2, wavelength converters 533, 536 and 539 are the wavelength λ1.
3 optical signal. The optical signal converted to the wavelength output by the wavelength converter is multiplexed by three wavelengths by the wavelength multiplexer and output to each output port.

For example, if an optical signal of wavelength λ2 input from the input port 501 is output as an optical signal of wavelength λ3 of the output port 505, this optical signal is output by the wavelength demultiplexer 5
The wavelength λ2 is demultiplexed at 11 and is transmitted to the wavelength converter 536 by the space switch 521. The wavelength λ2 incident on the wavelength converter is converted into the wavelength λ3, and the wavelength converter 53
The output port 5 has three wavelengths multiplexed by the wavelength multiplexer 515 together with the optical signals of the other wavelengths which have been wavelength-converted by 4, 535.
It is output from 05.

The space switch 521 is basically a 2 × 2 matrix optical switch having a coupler or a Mach-Zehnder as an element. The technology related to this space switch is described in, for example, Document 1: IEICE Technical Report Technical Report SSE88-150 1988 "Prototype of space division optical switch using polarization independent 8 × 8 matrix optical switch", Document 2: IEEE Journal of
Rightwave Technology Vol.9, No7, July 199
1, "4 x 4 GaAs / Al GaAs optical matrix switch
es with uniform device characteristics using alter
nating Δβ elctrooptics guided-wave directional co
uplers ", Reference 3: GLOB COM, 1990," expe.
rimental photonic multimedia switching system usin
g integrated 8 × 8 silica-based guided-wave crossba
r switch ”and the like.

[0006]

In the above-mentioned conventional wavelength division multiplexing cross-connect switch, wavelength separation is performed by the wavelength demultiplexer connected to each input port, and the wavelength demultiplexer is distributed to the wavelength converter at each output port by the spatial switch. After that, it is multiplexed by the wavelength multiplexer and output. At this time, the wavelength separation of the input optical signal is performed only by the wavelength demultiplexer connected to the input port. For this reason, the wavelength band of the separated optical signal needs to have a constant size.

In this case, in a network configuration using optical signals having two kinds of wavelength bands, such as an optical signal of a narrow band being multiplexed in the wavelength band separated by the wavelength demultiplexer, Multiplexing becomes impossible. Therefore, this wavelength division multiplexing cross-connect switch cannot cross-connect optical signals.

For example, a wavelength-multiplexed optical signal input from the input port is only separated into optical signals of respective wavelengths by a wavelength demultiplexer connected to the input port. I could only do signal cross-connects. In other words, if an optical signal cross-connect with a conventional optical cross-connect switch is used for cross-connecting optical signals whose wavelength bands differ greatly due to different transmission speeds, both broadband optical signals and narrow-band optical signals will have the same wavelength band. Cross-connect must be performed as an optical signal. In this case, the narrow band optical signal is accommodated in the wide wavelength band, and the wavelength band is wasted.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a single cross-connect for two kinds of optical signals having different wavelength bands, which are wavelength division multiplexed optical signals. An object of the present invention is to provide a wavelength division multiplexing optical cross-connect switch capable of performing optical cross-connects with a switch.

The above and other objects and novel features of the present invention will be apparent from the present specification and the accompanying drawings.

[0011]

In order to achieve the above object, the means (1) of the present invention is an optical cross-connect switch device for connecting wavelength-multiplexed optical signals, which is connected from each input port. A wideband optical signal and a narrowband optical signal multiplexed in this band are input, this input optical signal is connected to a wavelength demultiplexer having a wideband wavelength demultiplexing function, and the output of this wavelength demultiplexer is Narrowband optical signal groups wavelength-converted by a narrowband wavelength converter are input to the remaining input ports of the space switch, respectively, and output ports of the space switch. From the other part of the space switch, and from the remaining output ports of the space switch, first connect to the narrowband wavelength multiplexer, and then connect to the narrowband wavelength converter after being multiplexed. ,this The output from the band wavelength converter is connected to the broadband wavelength demultiplexer, each optical signal group is connected to the input port of the space switch, and the broadband wavelength converter connects the broadband optical signal to the wavelength converter, Connect the optical signal group of the band to the optical path, combine it with a combiner and send it out from one output, connect each broadband wavelength converter to the broadband wavelength multiplexer, multiplex and output from each output port. It is the most important feature.

According to the second aspect of the present invention, the narrow band wavelength conversion device separates a narrow band optical signal into a narrow band optical signal, a wavelength converter that performs wavelength conversion of each narrow band optical signal, It is characterized by being configured by a narrow band wavelength multiplexer that multiplexes a narrow band optical signal whose wavelength has been converted.

According to a third aspect of the present invention, in the wavelength division multiplexing optical cross-connect switch device according to the first or second aspect, a space switch, a narrow band wavelength conversion device, a wide band wavelength multiplexer, and a wide band are provided. A feature is that a multi-stage structure is formed by adding a plurality of stages each including a wavelength separator.

According to a fourth aspect of the present invention, in the wideband wavelength converter, the wideband optical signal is connected to a wideband wavelength converter, and the narrowband optical signal is narrowband wavelength demultiplexer, wavelength converter,
It is characterized in that it is provided with a selector that is connected to each of the narrow band wavelength multiplexers.

[0015]

According to the above-mentioned means, the inputted wavelength-division-multiplexed optical signal is separated into optical signals of respective wavelengths by the wide-band wavelength demultiplexer. As a result, an optical signal with a high transmission speed and a wide wavelength band (hereinafter referred to as a broadband optical signal) is cross-connected using a space switch and a wavelength converter. Furthermore, a plurality of optical signals are contained in a wide band, and an optical signal with a slow transmission speed and a wide wavelength band (hereinafter,
Called a narrow band optical signal) from the space switch,
The wavelength conversion of each optical signal is performed by the narrow band wavelength converter. After the wavelength conversion, the space switch again allocates the light to each output port, so that the narrow band optical signal is cross-connected. In other words, one device is used to cross-connect a wideband optical signal and a plurality of narrowband optical signals included in the wideband. As a result, the same optical cross-connect switch can be used to cross-connect optical signals composed of two types of wavelength bands, a wide band and a narrow band, without wasting the wavelength band.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing the structure of a wavelength division multiplexing optical cross-connect switch according to Embodiment 1 of the present invention.
04 to 106 are output ports. Reference numerals 111 to 116 denote wideband wavelength demultiplexers that demultiplex the input optical signal in a wideband wavelength band, and reference numerals 121 to 126 denote wideband wavelength demultiplexers that multiplex the wideband optical signals. Reference numeral 131 is a space switch that performs wavelength routing of a broadband optical signal. 141
Numerals 143 to 143 are narrowband wavelength conversion devices that perform wavelength conversion of narrowband optical signals at each wavelength.

Reference numerals 144, 145, 151 to 159 are elements constituting a narrow band wavelength converter, 144 is a narrow band wave separator, 145 is a narrow band wavelength multiplexer, and 151 to 1
Reference numeral 59 is a wavelength conversion device that converts the wavelength of a narrow band signal. Reference numerals 161 to 169 are broadband wavelength conversion devices that perform wavelength conversion of broadband optical signals.

Reference numerals 171 to 174 are elements constituting a wide band wavelength converter, 171 is a selector for switching connection depending on whether a broadband optical signal is incident or a narrow band optical signal is incident, and 172 is a broadband. A wavelength converter for converting the wavelength of an optical signal, 173 is a combiner for making the connection split by the selector 171 into one output, and 174 is an optical path for transmitting an optical signal in a narrow band. A control device 190 controls the cross-connect switch from the outside.

In the first embodiment, the wideband optical signals are multiplexed by three wavelengths, and further, the narrowband optical signals are multiplexed by three wavelengths in a part of the wavelength bands of the wideband optical signals. I'm thinking about typing.

FIG. 4 shows an example of wavelength allocation of optical signals. As shown in FIG. 4, optical signals of each wavelength are included in the wide wavelength bands 421 to 423. Wide wavelength band 421, 423
Among the narrow band optical signals 401 to 403 and 404 to 4
06 is included in each of three wavelengths, and the wide wavelength band 422 includes only one wavelength of the broadband optical signal 411.
In the broadband wavelength separators 111 to 116, the wide wavelength band 42
1 to 423 are separated by the narrow band wavelength separator 144,
The narrow band optical signals of 01 to 406 are separated by one wavelength.

The routing of a broadband optical signal will be described. The multiplexed optical signals input from the input ports 101 to 103 are demultiplexed by the broadband wavelength demultiplexers 111 to 113 and enter the space switch 131. The optical signal of each broadband is distributed by the spatial switch 131 to one of the broadband wavelength conversion devices 161 to 169. At this time,
The signals are transmitted to the broadband wavelength conversion device connected to the output port for outputting each broadband optical signal.

In this broadband wavelength converter, wavelength conversion is performed as follows. The broadband optical signal input to the wavelength conversion device is switched to the wavelength converter 172 by the selector 171, and converted into an optical signal of the wavelength output from the port. Since a plurality of narrow band optical signals are included in this band, the wavelength converter 172 cannot perform wavelength conversion, and therefore, the optical path 174 must be switched. Therefore, a selector is provided. The wavelength-converted broadband optical signal is sent from the broadband wavelength conversion device through the combiner 173.

This broadband optical signal is multiplexed with the optical signal sent from another wavelength conversion device by the broadband wavelength multiplexers 121 to 123 connected to each output port and output from the output port.

Here, a case where a broadband optical signal of wavelength λ2 input from the input port 101 is output as an optical signal of wavelength λ3 from the output port 105 will be described.
The optical signal of wavelength λ2 input from the input port 101 is separated by the broadband wavelength demultiplexer 111 into an optical signal of wavelength λ2. The optical signal of wavelength λ2 that has entered the space switch 131 is switched to the broadband wavelength conversion device 166 connected to the output port 105. This broadband wavelength converter 1
In 66, in order to perform wavelength conversion of the optical signal in the wide band, the optical signal entered by the selector 171 is converted into the wavelength converter 172.
Connect to. In this wavelength converter 172, the optical signal has a wavelength λ
The wavelength is converted to 3. The optical signal wavelength-converted to the wavelength λ3 passes through the combiner 173, enters the broadband wavelength multiplexer 122, is wavelength-multiplexed with the optical signals transmitted from the other wavelength conversion devices 164 and 165, and is output from the output port 105. Will be done.

Next, the routing of narrow band optical signals will be described. The input narrowband optical signal is separated by the wideband wavelength demultiplexers 111 to 113 into a signal group in which the narrowband optical signal is multiplexed into three wavelengths. This optical signal group is transmitted by the spatial switch 131 to the wide-band wavelength multiplexers 124-
It is distributed to 126. At this time, the narrowband optical signals are distributed by the spatial switch so that the narrowband optical signals collected in the same optical signal group when output are incident on the same wavelength conversion device. The narrow band optical signals multiplexed by the respective broadband wavelength multiplexers are respectively transmitted through the optical paths 181 to 181.
183, wavelength conversion devices 151-153 (152,
153 is incident on the same structure as 151) and wavelength conversion is performed. In each narrow band wavelength conversion device, the narrow band wavelength demultiplexer 144 first separates the narrow band optical signal. The separated optical signals are wavelength-converted into wavelengths output by the wavelength converters 151 to 159, respectively. After wavelength conversion,
The narrow band optical signals are incident on the narrow band wavelength multiplexer 145 and multiplexed, and are transmitted from the narrow band wavelength converter to the optical paths 18 respectively.
4 to 186. At this time, the wavelengths of the narrowband optical signals after the wavelength conversion are wavelength-converted into a state in which the wavelengths are multiplexed into three wavelengths in a wide wavelength band. As a result, the spatial switch 131 can handle the narrow band optical signals of three wavelengths as one signal group having the same wavelength band as the wide band optical signal.

The optical signal group in which the narrow band optical signals of three wavelengths that have passed through the optical paths 184 to 186 are multiplexed is separated into respective optical signal groups by the wide band wavelength demultiplexer, and the optical signals are incident on the space switch 131 again. The spatial switch 131 distributes the optical signal group to the broadband wavelength conversion devices 161-169 connected to the output port of the optical signal group.

In the broadband wavelength conversion devices 161-169,
Does not perform wavelength conversion of narrow band optical signals. The selector 171 is connected to the optical path 174 in order to input the narrow band optical signal to the wide band wavelength conversion devices 161-169 without wavelength conversion. The optical signal group is switched from the optical path 174 to the combiner 173, and is transmitted from the broadband wavelength conversion device.

After being transmitted from the wideband wavelength conversion device, each optical signal group in which narrowband optical signals are multiplexed by three wavelengths is multiplexed with a wideband optical signal by a wideband wavelength multiplexer, and each wideband wavelength multiplex is performed. Output ports 104-1 connected to the container
It is output from 06.

In the above structure, the broadband optical signal passes through the broadband wavelength demultiplexers 111 to 113, the space switch 131, the broadband wavelength conversion devices 161-169, and the broadband wavelength multiplexers 121-123. By passing through this path, a broadband optical signal is output as an optical signal of an arbitrary wavelength from an arbitrary output port.

The narrow band optical signal is input to the narrow band wavelength converters 141 to 143 having the same optical signal group whose wavelength positions are switched by the spatial switch 131 separately from the broadband optical signal, and the wavelength positions are switched. become. With such a configuration, the wavelength division multiplexing optical cross-connect switch apparatus according to the first embodiment is capable of cross-connecting narrow-band optical signals, though it is an imperfect line group for narrow-band optical signals. Become.

In this wavelength division multiplexing optical cross-connect switch device, the space switch 131, the narrow band wavelength converters 141 to 143, and the wide band wavelength converters 161 to 16 are arranged so as to prevent internal blockage as much as possible depending on the output state.
It is necessary to perform the operation of 9.

Further, when outputting an optical signal, since each device cannot operate independently of each other, it is necessary to control each device externally to operate each device. Therefore, the control device 190 provided outside the cross-connect switch controls each device according to the output state.

As can be seen from the above description, the first embodiment
According to the above, the cross-connect can be performed by the same cross-connect switch for the wide band optical signal and the narrow band optical signal having the different wavelength bands. The optical cross connect switch can be applied to an optical network using optical signals having different transmission rates.

(Embodiment 2) FIG. 2 is a block diagram showing the construction of Embodiment 2 of the present invention. The wavelength division multiplexing optical cross-connect switch device of the second embodiment is the same as the first embodiment.
A narrowband wavelength converter that performs wavelength conversion of narrowband optical signals, a space switch that connects narrowband optical signals to a narrowband wavelength converter, a wideband wavelength multiplexer, and a wideband wavelength demultiplexer. It is characterized by.

In FIG. 2, the space switch 231, the wide band wavelength multiplexers 227 to 229 and the wide band wavelength demultiplexers 214 to 216 connected to the space switch 231, and the narrow band connected to each wide band wavelength demultiplexer and the wide band wavelength demultiplexer. The configuration is such that band wavelength conversion devices 241 to 243 are added. The narrowband wavelength conversion devices 241-246 have the same configuration as that used in the first embodiment. When cross-connecting narrow band optical signals by configuring the space switch in two stages, it is possible to reduce the probability of internal blockage in the cross-connect switch.

The internal blockage means that when all the input optical signals are converted into arbitrary wavelengths from arbitrary output ports and then outputted, a certain optical signal cannot be arbitrarily outputted due to the problem of the configuration of the switch. Such a state is called internal blockage. For example, as shown in FIG. 6 (an example of a state in which internal blockage occurs), wavelengths F1-1 and F2--in the wide band λ1 and λ2 from the input port 101 in the configuration of the first embodiment.
1, F3-1, F4-1, F5-1, F6-1 multiplexed optical signals are input, and are input from the input port 102 to the broadband λ1,
Wavelengths F1-2, F2-2, F3-2, F4-2, in λ2
The optical signals of F5-2 and F6-2 are multiplexed and input. In this case, the broadband λ from the output port 104
1, in λ2, F1-1, F3-1, F1-2, F4-1,
Internal blockage occurs when the optical signals of F2-1 and F5-2 are output.

In this output state, the input ports 101, 1
All the optical signals in the widebands λ1 and λ2 input from 02 must be input to one narrowband wavelength conversion device. However, this causes more optical signals to be input to the narrowband wavelength conversion device. In such a case, the optical cross-connect switch having the one-stage configuration cannot switch such an optical signal. Such a state in which the output cannot be performed is referred to as internal blockage.

The routing of a wide band optical signal in the second embodiment will be described.

The broadband optical signal is transmitted to the broadband wavelength demultiplexer 21.
1 to 213, and the light is sent to one of the optical paths 261 to 269 by the space switch 231. At this time, different optical signals are distributed to the same optical path so as not to overlap with each other, and the respective optical signals are transmitted through separate optical paths while being separated. This space switch 231
Aims to connect the narrow band optical signals to the narrow band wavelength conversion device, and the optical signals of the respective wide bands are transmitted to the optical path 261.
To 269. The broadband optical signal that has passed through the optical path enters the spatial switch 232 and is connected to the output ports of the broadband wavelength conversion device 251.
To 259 (these have the same configuration as the broadband wavelength conversion devices 161 to 169 used in the first embodiment). At this time, each broadband optical signal is incident on the wavelength conversion device connected to the output port. Each broadband wavelength converter converts a broadband optical signal into a wavelength for output.
The wavelength-converted optical signal is multiplexed by a wide-band wavelength multiplexer connected to each wavelength conversion device, and each output port 204 to
It is output from 206.

The narrow band optical signals are distributed to the wide band wavelength multiplexers 227 to 229 by the spatial switch 231, multiplexed and enter the narrow band wavelength converters 241 to 243. The narrowband wavelength conversion devices 241 to 243 undergo wavelength conversion for each wavelength of each narrowband optical signal. After undergoing the wavelength conversion, the narrow band optical signal enters the broadband wavelength demultiplexers 214 to 216. When separated by a broadband wavelength separator As in the case of the first embodiment, 3 included in the broadband
It is separated into an optical signal group consisting of optical signals in a narrow band of wavelengths.
Each optical signal group is distributed in the optical signal group unit by the spatial switch 231, and is transmitted to any one of the optical paths 261 to 269 and is incident on the spatial switch 232.

In the space switch 232, the space switch 2
Similar to 31, the optical signal group for switching the wavelength channels is distributed so as to enter one wavelength conversion device. After the wavelength conversion is performed by the narrow band wavelength conversion devices 244 to 246, the narrow band wavelength conversion devices 244 to 246 enter the wide band wavelength conversion device connected to the output port, and are output without being subjected to the wavelength conversion, and the respective wide band wavelengths are diversified. The signals are multiplexed by the devices 221 to 223 and output from the output ports 204 to 206.

In the second embodiment, the operation of each device is controlled by a control device 291 prepared outside the optical cross connect switch.
Controlled by.

As can be seen from the above description, the second embodiment
According to this, it is possible to reduce internal blockage when cross-connecting a narrow band optical signal. This optical cross-connect switch can also be applied to an optical network that transmits optical signals with different transmission rates.

(Third Embodiment) FIG. 3 is a block diagram showing a structure of a third embodiment of the present invention. The third embodiment is an optical wavelength multiplexing cross-connect switch in which the wideband wavelength conversion device has a wavelength conversion function for narrowband optical signals as compared with the second embodiment, except for the second embodiment and the wideband wavelength converter. Have the same configuration.

In FIG. 3, 361 is a selector and 362.
Is a wavelength converter for converting the wavelength of a broadband optical signal, 363
Is a converging unit, 364 is a narrow band wavelength demultiplexer, 365 is a narrow band wavelength multiplexer, and 366 to 368 are wavelength converters that perform wavelength conversion of optical signals in each narrow band.

In order to perform wavelength conversion of a narrow band optical signal,
The narrow band wavelength demultiplexer 364, the narrow band wavelength demultiplexer 36
5. Wavelength converter 36 for converting the wavelength of each narrow band optical signal
6 to 368 are added.

In the third embodiment, the broadband optical signal is cross-connected as in the first and second embodiments. The narrow band optical signal is different from the second embodiment in that the wide band wavelength converter also performs wavelength conversion. The broadband optical signal is
The selector 361 switches to the wavelength converter 362 and converts it into an optical signal of the wavelength output from the port.
Here, since the wavelength converter 362 does not perform wavelength conversion on the narrow band optical signal, the selector switches the narrow band optical signal to the narrow band wavelength demultiplexer 364.

The broadband optical signal is wavelength-converted by the wavelength converter 362, passes through the combiner 363, and is sent out from the broadband wavelength converter. This broadband optical signal is multiplexed with the optical signal sent from another wavelength conversion device and output by the broadband wavelength multiplexers 321 to 323 connected to each output port.

The processing of the narrow band optical signal is as follows. In order to perform the wavelength conversion of the narrow band optical signal, it is necessary that the optical signal group is separated into the narrow band optical signals. Therefore, in the broadband wavelength conversion devices 351 to 359, the input optical signal group is switched to the narrowband wavelength demultiplexer 364 by the selector 361. The narrow band optical signal of each wavelength is separated by the narrow band wavelength demultiplexer. The separated narrow band optical signals of each wavelength are wavelength-converted into wavelengths output by the wavelength converters 366 to 368. Wavelength converted 3
The narrow band wavelength optical signal is multiplexed by the narrow band wavelength multiplexer 365 and transmitted through the combiner 363.

In this wide band wavelength converter, wavelength conversion of a wide band optical signal and further wavelength conversion of a narrow band optical signal are performed. Therefore, as explained above, the selector switches the wavelength converters to be connected depending on the case of the optical signals of the wide band and the narrow band. After being transmitted from the wideband wavelength converter, the narrowband optical signal group is multiplexed with the wideband optical signal by the wideband wavelength multiplexer, and output from the output ports 304 to 306 connected to the respective wideband wavelength multiplexers. To be done.

By performing the wavelength conversion of the narrow band optical signal with the wide band wavelength converter, the narrow band optical signal is transmitted through the three-stage wavelength converter, and the connection state can be changed more freely. become able to.

In the third embodiment, the operation of each device is controlled by the control device 395 provided outside the optical cross connect switch.

As can be seen from the above description, this embodiment 3
According to this, in the case of cross-connecting a narrow band optical signal, it is possible to avoid the internal blockage and make the connection. By using this optical cross-connect switch, it is possible to more freely cross-connect optical signals having different transmission rates.

Although the present invention has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and it is needless to say that various modifications can be made without departing from the scope of the invention. Absent.

[0056]

As described above, according to the present invention, a plurality of types of optical signals, which are wavelength-division-multiplexed and have widely different wavelength bands, can be directly cross-connected by one optical cross-connect switch. It can be carried out. This can be used as an optical cross-connect switch of an optical network in which optical signals having different wavelength bands are transmitted.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing a configuration of a wavelength division multiplexing optical cross-connect switch according to a first embodiment of the present invention,

FIG. 2 is a block configuration diagram showing a configuration of a second embodiment of the present invention,

FIG. 3 is a block configuration diagram showing a configuration of a third embodiment of the present invention,

FIG. 4 is a diagram for explaining an example of a state of wavelength allocation of optical signals having widely different wavelength bands according to the present embodiment,

FIG. 5 is a block configuration diagram showing a configuration of a conventional wavelength division multiplexing cross-connect switch for cross-connecting an optical signal having a single wave band,

FIG. 6 is a diagram showing an example of a state in which an internal blockage has occurred.

[Explanation of symbols]

101-103, 201-203, 301-303 ... Input port, 104-106, 204-206, 304-
306 ... Output port, 111-116, 211-21
9, 311 to 319 ... Broadband wavelength separator, 121 to 12
6,221-229,321-329 ... Broadband wavelength multiplexer, 131, 231, 232, 331, 332 ... Spatial switch, 141-143, 241-246, 341-
346 ... Narrow-band wavelength converter, 144, 364 ... Narrow-band wavelength separator, 145, 365 ... Narrow-band wavelength multiplexer, 1
51-159 ... Wavelength converter, 161-169, 251
-259,351-359 ... Broadband wavelength converter, 17
1, 361 ... Selector, 172, 362, 366-36
8 ... Wavelength converter, 173, 363 ... Combiner, 174, 1
81-186, 261-269, 271-282, 37
1-379, 381-392 ... Optical path, 190, 291,
395 ... Control device, F1-1, F2-1, F3-1, F4-1,
F5-1, F6-1 ... Input ports 101 have wideband λ1, λ
Wavelengths to be multiplexed and input into two, F1-2 and F2-
2, F3-2, F4-2, F5-2, F6-2 ... Optical signals multiplexed and input into the input port 102 in the widebands λ1 and λ2.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H04J 14/02

Claims (4)

[Claims] 1. An optical cross-connect switch device for connecting wavelength-multiplexed optical signals, wherein a wideband optical signal and a narrowband optical signal multiplexed in this band are input from each input port. , The input optical signal is connected to a wavelength demultiplexer having a broadband wavelength demultiplexing function, the output of this wavelength demultiplexer is connected to some input ports of the space switch, and the remaining input ports of the space switch are connected to , Each of the narrow band optical signal groups wavelength-converted by the narrow band wavelength conversion device is input, connected to a wide band wavelength converter from a part of the output port of the space switch, and from the remaining output ports of the space switch. , First connect to the narrow band wavelength multiplexer, and after being multiplexed, connect to the narrow band wavelength converter,
The output from this narrow band wavelength converter is connected to a wide band wavelength demultiplexer, each optical signal group is connected to the input port of the space switch, and the wide band wavelength converter connects the wide band optical signal to the wavelength converter. , A narrow band optical signal group is connected to the optical path, combined by a combiner and sent out from one output, connected from each wide band wavelength converter to a wide band wavelength multiplexer, multiplexed and output from each output port A wavelength division multiplexing optical cross-connect switch device characterized by the above. 2. The narrowband wavelength conversion device comprises a narrowband wavelength demultiplexer for demultiplexing into narrowband optical signals, a wavelength converter for performing wavelength conversion of each narrowband optical signal, and wavelength-converted narrowband light. The wavelength division multiplexing optical cross-connect switch device according to claim 1, wherein the wavelength division multiplexing optical cross-connect switch device comprises a narrow band wavelength multiplexer for multiplexing signals. 3. The wavelength division multiplexing optical cross-connect switch device according to claim 1, wherein a plurality of stages including the space switch, the narrow band wavelength conversion device, the wide band wavelength multiplexer, and the wide band wavelength demultiplexer are added. The wavelength division multiplexing optical cross-connect switch device according to claim 1 or 2, which has a multi-stage configuration. 4. The wideband wavelength converter connects a wideband optical signal to a wideband wavelength converter, and connects a narrowband optical signal to a narrowband wavelength demultiplexer, a wavelength converter, and a narrowband wavelength multiplexer, respectively. The wavelength division multiplexing optical cross-connect switch device according to any one of claims 1 to 3, further comprising a selector.