JP2001318395A - Light wavelength converting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optionally select wavelength to be converted when the wavelengths of a wavelength multiplex signal light are converted together. SOLUTION: Pump lights Pp1 to Pp4 having wavelengths λ5 to λ8 are inputted to optical couplers 116 to 119 as they are and signal lights Ps1 to Ps4 are optionally allocated by an optical switch 115 and then inputted to the optical couplers 116 to 119. Consequently, pump lights Pp1 to Pp4 inputted to light wavelength converters 120 to 123 are not changed, but the signal lights Ps1 to Ps4 inputted to the light wavelength converters 120 to 123 are replaced through the switching operation of the optical switch 115. Consequently, the signal lights Ps1 to Ps4 have their wavelengths converted by the light wavelength converters 120 to 123 to wavelengths A5 to A8 and are converted into converted signal lights Po1 to Po4, but the converted signal lights Po1 to Po4 have their wavelengths replaced through the switching operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical wavelength conversion apparatus, and more particularly to an optical wavelength conversion apparatus applied to multi-wavelength batch conversion used in optical transmission systems such as optical communication, optical switching, and optical information processing using wavelength division multiplexing. It is about effective technology.

[0002]

2. Description of the Related Art Conventionally, an optical transmission system utilizing wavelength multiplexing has been known as an erbium-doped optical fiber amplifier (effective band: 1530 to 1560 nm, 1.55 μm or less).
m) band) has been developed around the 1.55 micron (μm) band. However, in recent years, a long wavelength band optical fiber amplifier (effective band 1570 to 1600n)
m, hereinafter referred to as the 1.58 micron (μm) band), and networks using the 1.58 micron (μm) band are also being developed. What is important here is the interconnection of networks using various wavelengths.

[0003] In Japan, dispersion-shifted fibers that are advantageous for transmitting high-speed signals (for example, 10 Gb / s or more) have long been laid in Japan. On the other hand, dispersion-shifted fibers have strong interference between wavelength-division multiplexed signals and generally use unequally-spaced wavelength-division multiplexed signals. On the other hand, in the United States and Europe, equally-spaced wavelength-division multiplexed signals are used together with the usual dispersion fiber laying, and interconnection between unevenly-spaced and equally-spaced networks is important.

FIG. 16 is a diagram for explaining a conventional multi-wavelength batch converter for connecting a network.
Here, for simplicity of explanation, WDM using four wavelengths
(Wavelenght Division Multiplexing) system, assuming input signal light Ps1, Ps2, Ps3,
Four wavelengths λ1, λ2, λ3, λ4 are used as the wavelengths of Ps4, and the wavelength-converted lights Po1, Po2, Po3,
Four wavelengths λ5, λ6, λ7, λ8 are used as the wavelength of Po4. In practice, for example, λ1, λ2, λ3, λ
The wavelengths of 4, λ5, λ6, λ7, and λ8 are 1551 nm, 1552 nm, 1553 nm, and 1554, respectively.
nm, 1555 nm, 1556 nm, 1557 nm, 1
558 nm.

In FIG. 16, reference numeral 1001 denotes an optical fiber for inputting a wavelength multiplexed signal light; 1002, an optical fiber for inputting a pump light; 1003, an optical wavelength demultiplexer; Diffraction grating (A
WG), 1004 to 1007 are demultiplexed optical waveguides or optical fibers, 1008 to 1011 are optical wavelength converters,
Reference numeral 1012 denotes an optical multiplexer, for example, AWG by PLC, 10
Reference numeral 13 denotes an output optical fiber.

Here, the wavelength multiplexed signal light input optical fiber 1001 has wavelengths λ1, λ2, λ3, λ4, the wavelength multiplexed signal light Ps1, Ps2, Ps3, Ps4, and the pump light input optical fiber 1002 has the wavelength λ5, λ5. When the pump lights Pp1, Pp2, Pp3, and Pp4 of λ6, λ7, and λ8 are input, the signal light Ps1 having the wavelength λ1 and the pump light Pp5 having the wavelength λ5 are input to the optical waveguide 1004, and the pump light Pp5 having the wavelength λ2 is input to the optical waveguide 1005. The signal light Ps2 and the pump light Pp having a wavelength of λ6
6 is a signal light Ps3 having a wavelength of λ3 in the optical waveguide 1006.
And a pump light Pp7 having a wavelength of λ7, and a signal light Ps4 having a wavelength of λ4 and a pump light Pp having a wavelength of λ8 in the optical waveguide 1007.
p8 is output. Here, the input signal light Ps1
ＰPs4 is arbitrarily modulated to perform wavelength conversion in each of the optical wavelength converters 1008 to 1011.

For example, by using a semiconductor optical amplifying element as an optical wavelength conversion element of an optical wavelength converter and injecting a certain optimum fiber current, the gain of the pump light decreases when the input signal light is on, Input signal light is off (of
In the case of f), so-called mutual gain modulation in which the gain of the pump light is recovered occurs, and inverter-type wavelength conversion occurs. That is, the pump lights Pp1, Pp2, Pp3,
The wavelengths λ5, λ6, λ7, λ8 of Pp4 and the input signal light Ps
Wavelength-converted lights Po1, Po2, Po3, and Po4 having signal information of 1, Ps2, Ps3, and Ps4 are generated. This is multiplexed by an optical multiplexer 1012, and the output optical fiber 101
By outputting the data to 3, the multi-wavelength batch conversion becomes possible. Here, multi-wavelength batch conversion between adjacent wavelengths (1
1555 to 1558 from signal light of 551 to 1554 nm
Although only the wavelength conversion to nm has been described, by changing the wavelength of the pump light, multi-wavelength batch conversion to a farther wavelength (for example, 1.55 nm band to 1.58 μm band)
Multi-wavelength batch conversion is also possible.

[0008]

However, in the above-mentioned conventional method, for example, four signal lights Ps1, Ps2,
The wavelengths of Ps3 and Ps4 are changed from λ1 to λ5,
6, there was a problem that the wavelength order could not be changed only by mechanically converting from λ3 to λ7 and from λ4 to λ8. Therefore, a variable multi-wavelength batch conversion device capable of selecting a wavelength to be converted has been demanded.

It is an object of the present invention to provide a wavelength converter capable of arbitrarily selecting a wavelength to be converted in an interconnection between networks multiplexing multiple wavelengths.

[0010]

The outline of the invention disclosed in the present application is briefly described as follows.
The present invention relates to an optical wavelength converter including an optical wavelength demultiplexer, an n × n optical switch, n two-input one-output optical couplers, n optical wavelength converters, and an optical multiplexer. The optical wavelength demultiplexer has one signal light input port for inputting n-wavelength multiplexed signal light propagating through an optical fiber, and at least one of a wavelength interval and a wavelength band is different from the wavelength multiplexed signal light. n pump light input ports for inputting one wavelength each of pump light of n wavelengths, n signal light output ports, n pump light output ports, and n wavelengths input to the signal light input ports Means for demultiplexing the wavelength multiplexed signal light into the n signal light output ports, and outputting n pump lights to the n pump light output ports. Propagate through the n signal light output ports of the optical wavelength demultiplexer Switch input ports for inputting the signal light, n switch output ports for outputting the signal light, and means for switching the signal light output from each switch output port. The input-one output optical coupler multiplexes the one-wavelength signal light propagating through the selected one optical switch output port and the one-wavelength pump light propagating through the one pump light output port, and then combines the n Means for injecting the signal light and the pump light into any one of the plurality of optical wavelength converters, wherein the n optical wavelength converters each convert one signal light and one pump light into a pump light. Means for outputting one wavelength-converted light having a wavelength defined by the wavelength and signal information of the signal light, and the optical multiplexer outputs n wavelength-converted lights output from the n wavelength converters. One wavelength multiple It is made of means for multiplexing the wavelength converted light.

In the above-mentioned optical wavelength converter, the optical wavelength demultiplexer includes one signal light input port for inputting n-wavelength wavelength multiplexed signal light propagating through an optical fiber; One pump light input port for inputting wavelength multiplexed pump light in which n wavelengths of pump light having at least one of a wavelength interval or a wavelength band different from each other are multiplexed, n signal light output ports, and n pump lights An optical output port,
The n-wavelength multiplexed signal light input to the signal light input port is demultiplexed to the n signal light ports, and the n wavelength multiplexed pump lights are separated to the n pump light output ports. Means for waving.

Further, the present invention has n signal light output ports and n pump light output ports, and has n wavelength signal light and n wavelength pump having different wavelengths with respect to the wavelength of the signal light. An optical wavelength demultiplexer that branches so that one signal light is output from one signal light output port and one pump light is output from one pump light output port when light is input; It has n switch input ports and n switch output ports individually connected to the n signal light output ports of the optical wavelength demultiplexer. An n × n optical switch for switching signal light output from the
One wavelength signal light is input from one of the switch output ports of the × n optical switch, and one wavelength signal light is output from one of the signal light output ports of the optical wavelength demultiplexer. When the pump light is input, n cross-phase-modulated optical wavelength converters that output wavelength-converted light having the same wavelength as the pump light and having signal information of signal light; An optical multiplexer for multiplexing n wavelength-converted lights output from the optical wavelength converter and outputting the multiplexed wavelength-converted light.

Further, the present invention has n signal light output ports, and branches so that when signal light of n wavelengths is input, one signal light output port outputs one signal light. An optical wavelength demultiplexer; n switch input ports individually connected to n signal light output ports of the optical wavelength demultiplexer; and n switch output ports. By doing so, an n × n optical switch that switches the signal light output from each switch output port, and a signal light of one wavelength is input from one output port of the switch output ports of the n × n optical switch. When pump light of one wavelength is input from the opposite side to the n × n optical switch, the wavelength converted light having the same wavelength as the pump light and having signal information of the signal light is converted into the n × n light. Output to switch n cross gain modulation type optical wavelength converters, interposed between the n × n optical switch and each cross gain modulation type optical wavelength converter, and output from each cross gain modulation type optical wavelength converter. N optical fiber gratings for reflecting the converted wavelength converted light and the wavelength converted light reflected by each optical fiber grating and passing through each mutual gain modulation type optical wavelength converter are multiplexed and output, and a signal is output. When an n-wavelength pump light having a wavelength different from the wavelength of light is input, an optical wavelength multiplexer / demultiplexer that individually sends each pump light to the mutual gain modulation type optical wavelength converter, and n is added to the wavelength converter. And an optical circulator for inputting pump light of the wavelength and passing the multiplexed converted signal light.

Further, the present invention has n signal light output ports, and branches so that one signal light output port outputs one signal light when n wavelength signal light is input. It has an optical wavelength demultiplexer, n switch input ports individually connected to n signal light output ports of the optical wavelength demultiplexer, and n switch output ports, and performs a switching operation. Thus, an n × n optical switch for switching the signal light output from each switch output port, and a signal light of one wavelength is input from one of the switch output ports of the n × n optical switch. At the same time, when one wavelength of pump light is input from the side opposite to the n × n optical switch, the wavelength conversion becomes a wavelength defined by the wavelengths of the pump light and the signal light and has signal information of the signal light. Output light N wavelength-converted optical wavelength converters and wavelength-converted light output from each wavelength-converted optical wavelength converter are multiplexed and output, and the wavelength is different from the wavelength of the signal light. and an optical wavelength multiplexer / demultiplexer that individually sends each pump light to the four-wave mixing optical wavelength converter when n-wavelength pump light is input.

Further, the present invention has n signal light output ports, and branches so that one signal light output port outputs one signal light when n wavelength signal light is input. It has an optical wavelength demultiplexer, n switch input ports individually connected to n signal light output ports of the optical wavelength demultiplexer, and n switch output ports, and performs a switching operation. Thus, an n × n optical switch for switching the signal light output from each switch output port, and a signal light of one wavelength is input from one of the switch output ports of the n × n optical switch. And n oscillation-suppressed optical wavelength converters that output wavelength-converted light having a preset wavelength different from the wavelength of the signal light and having signal information of the signal light, and each of the oscillation-suppressed optical wavelength converters Output from the container And an optical multiplexer for multiplexing and outputting the converted wavelength light.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings together with embodiments (examples) according to the present invention.

(Embodiment 1) FIG. 1 is a block diagram showing a schematic configuration of an optical wavelength conversion apparatus (multi-wavelength batch conversion apparatus) according to Embodiment 1 of the present invention. Here, for simplicity of description, a WDM system using four wavelengths is assumed, and four wavelengths λ1, λ2, λ3, λ4 are used as wavelengths of input signal light Ps1, Ps2, Ps3, and Ps4 before conversion. Four wavelengths λ5, λ6, λ7, and λ8 are used as the wavelengths of the subsequent wavelength converted lights Po1, Po2, Po3, and Po4. In practice, for example, λ1, λ2, λ3, λ4, λ5, λ6, λ
The wavelengths of 7, λ8 are 1551 nm, 15
52nm, 1553nm, 1554nm, 1555n
m, 1556 nm, 1557 nm, and 1558 nm.

In FIG. 1, 101 is an optical fiber for inputting a wavelength multiplexed signal light, and 102 is a pump light Pp1 having a wavelength of λ5.
, A pump light input optical fiber 103 for inputting a pump light Pp2 having a wavelength λ6, and a pump light Pp having a wavelength λ7 104.
Optical fiber for pump light input for inputting 3; 105
Is an optical fiber for pump light input for inputting pump light Pp4 having a wavelength of λ8, 106 is an optical wavelength demultiplexer, 107 to
114 is an optical waveguide or optical fiber, 115 is a 4-input / 4-output optical switch, 116-119 are 2-input / 1-output optical couplers, 120-123 are optical wavelength converters, 124 is an optical multiplexer, and 125 is output light. Fiber.

FIG. 2 is a block diagram for explaining an eight-input, eight-output array type optical waveguide as an example of the optical wavelength demultiplexer 106. As shown in FIG. This is formed by a quartz semiconductor or polymer optical waveguide,
01 to 308 are input optical waveguides (input ports);
Is a slab waveguide, 310 is an array type optical waveguide, 311 is a slab waveguide, and 312 to 319 are output optical waveguides (output ports).

The input signal light is supplied to input optical waveguides 301 to 30.
8, the light enters the slab waveguide 309, and is distributed with equal intensity to the arrayed waveguide 310. The phase of the distributed input signal light changes depending on the difference in the optical path length of the array type optical waveguide 310, and the input signal light is converged by the slab waveguide 311 on one of the output optical waveguides 312 to 319. At this time, since the phase condition varies depending on the wavelength of the input light, when the wavelength changes, the output port changes, and it can be used as a so-called spectroscope.

FIG. 3 is a diagram showing an embodiment of the input / output ports of the array type optical waveguide grating. In FIG. 3, λ1 to λ
Numeral 8 denotes equally spaced wavelengths, for example, 1551 nm, 15
52nm, 1553nm, 1554nm, 1555n
m, 1556 nm, 1557 nm, and 1558 nm. Here, for example, the wavelength λ is input to the input optical waveguide 301.
When light of 1 is incident, the wavelength λ1 is output to the optical output waveguide 312, in the case of the wavelength λ2, is output to the output optical waveguide 313, and in the case of the wavelength λ3, it is output to the output optical waveguide 314. Is output. Also, the input optical waveguide 301
When wavelength-multiplexed light of 1, λ2 and λ3 is input, λ1
Represents the output optical waveguide 312, and λ2 represents the output optical waveguide 31.
3, λ3 is demultiplexed to the output optical waveguide 314 (see FIG. 3). Also, since the array type optical waveguide grating has a circulating property, λ9 = 1559 nm is λ1 and λ10 =
1560 nm behaves similarly to λ2. further,
λ1 = 1567 nm, λ25 = 1585 nm, etc. are also λ1
Behaves the same as

In FIG. 1, wavelengths λ1 and λ are applied to a wavelength-multiplexed signal light input optical fiber 101 (corresponding to 301 in FIG. 3).
2, λ3, λ4 wavelength multiplexed signal light Ps1, Ps2, Ps
3, Ps4 is connected to the pump light input optical fiber 102 (FIG. 3).
306) and the pump light input optical fiber 103 (corresponding to 308 in FIG. 3).
The pump light Pp2 having a wavelength of λ6 and the pump light Pp3 having a wavelength of λ7 are applied to the pump light input optical fiber 104 (corresponding to 302 in FIG. 3), and the pump light input optical fiber 105 (corresponding to 304 in FIG. 3). Pump light Pp4 having a wavelength of λ8,
When each is input, the signal light Ps1 having the wavelength λ1 is input to the optical waveguide 107 (corresponding to 312 in FIG. 3).
(Corresponding to 313 in FIG. 3) includes the signal light Ps2 having the wavelength λ2.
However, the optical waveguide 109 (corresponding to 314 in FIG. 3) has a wavelength λ.
The signal light Ps3 having the wavelength λ4 is supplied to the optical waveguide 110 (corresponding to 315 in FIG. 3).
(Corresponding to 319 in FIG. 3) includes a pump light Pp1 having a wavelength λ5.
However, the optical waveguide 112 (corresponding to 318 in FIG. 3) has a wavelength λ.
6 is supplied to the optical waveguide 113 (302 in FIG. 3).
), The pump light Pp3 having the wavelength λ7 is supplied to the optical waveguide 1
14 (corresponding to 304 in FIG. 3) has pump light P of wavelength λ8.
p4 is output.

Since the optical waveguides 107 to 110 are connected to the optical switch 115, the wavelengths are λ1, λ2, λ.
3, .lambda.4 signal light Ps1, Ps2, Ps3, Ps4 are passed through optical couplers 116-119 to an arbitrary wavelength converter 12.
It is input to 0-123. On the other hand, the wavelength is λ5, λ6, λ
7, .lambda.8 pump light Pp1, Pp2, Pp3, Pp4 are also input to the respective optical wavelength converters 120-123 through the optical couplers 116-119.
ＰPs4 is arbitrarily modulated to perform wavelength conversion in each of the optical wavelength converters 120 to 123.

For example, when a semiconductor optical amplifier is used as an optical wavelength conversion element of the optical wavelength converters 120 to 123 and a certain optimum bias current is injected, when the input signal light is on, the gain of the pump light is increased. When the input signal light is off, the so-called mutual gain modulation in which the gain of the pump light is restored occurs, and inverter-type wavelength conversion occurs. That is, the pump light Pp1,
Wavelengths λ5, λ6, λ7, λ8 of Pp2, Pp3, Pp4
Then, wavelength converted lights Po1, Po2, Po3, Po4 having signal information of the input signal lights Ps1, Ps2, Ps3, Ps4 are generated. This is multiplexed by the optical multiplexer 124 and output to the output optical fiber 125, whereby multi-wavelength batch conversion becomes possible.

In the wavelength conversion of the mutual gain modulation type, the pump light wavelength = the wavelength of the converted light. In the wavelength conversion of the four-wave mixing type, the wavelength of the signal light + the wavelength of the converted light = 2 × the wavelength of the pump light. For example, the wavelength converted light does not always have the wavelength of the pump light.

Here, a feature of the present invention is that the order of wavelengths to be converted can be changed by changing the input / output of the optical switch 115. For example, if the optical switches 115 are all connected in a through-type as shown in FIG. 4, the signal light Ps1 having the wavelength λ1 and the pump light Pp5 having the wavelength λ5 are transmitted to the optical wavelength converter 121. Is the signal light Ps2 having the wavelength λ2 and the pump light Pp6 having the wavelength λ6, the optical wavelength converter 122 is provided with the signal light Ps3 having the wavelength λ3 and the pump light Pp7 having the wavelength λ7, and the optical wavelength converter 123 is provided with the wavelength. Is λ4 and the wavelength is λ4.
As a result, as shown in FIG. 5, the wavelengths of the four signal lights are changed from wavelength λ1 to wavelength λ5, from wavelength λ2 to wavelength λ6, from wavelength λ3 to wavelength λ7, as shown in FIG. Multi-wavelength batch conversion from wavelength λ4 to wavelength λ8 is performed.

On the other hand, as shown in FIG.
When the 15 output ports are connected by being shifted by one stage, the pump light input to each wavelength converter does not change, and only the signal light changes. In this case, the wavelength is λ
4, the signal light Ps4 having a wavelength of λ5, the pump light Pp5 having a wavelength of λ5, the signal light Ps1 having a wavelength of λ1 and the pump light Pp6 having a wavelength of λ6, and the optical wavelength converter 122 having a wavelength of λ2. Signal light Ps2 and pump light Pp7 having a wavelength of λ7
However, the optical wavelength converter 123 supplies the signal light Ps3 having a wavelength of λ3.
And the pump light Pp8 having a wavelength of λ8 is input. As a result, as shown in FIG. 7, the wavelengths of the four signal lights can be multi-wavelength-converted from wavelength λ4 to wavelength λ5, from wavelength λ1 to wavelength λ6, from wavelength λ2 to wavelength λ7, and from wavelength λ3 to wavelength λ8.

In addition to the above, since the connection of the optical switch can be freely changed, multi-wavelength batch conversion between arbitrary wavelengths becomes possible, and a network configuration with a high degree of freedom is made possible. Here, multi-wavelength batch conversion between adjacent wavelengths (from signal light of 1551 to 1554 nm to 1555 to 1555 nm) is performed.
Although only the wavelength conversion to 58 nm has been described, by changing the wavelength of the pump light, multi-wavelength batch conversion to a farther wavelength (for example, 1.55 nm band to 1.58 nm band) is performed.
Band) can also be converted simultaneously.

(Embodiment 2) FIG. 8 is a block diagram showing a schematic configuration of an optical wavelength conversion apparatus (multi-wavelength batch conversion apparatus) according to Embodiment 2 of the present invention. Here, for simplicity of description, a WDM system using four wavelengths is assumed, and four wavelengths λ1, λ2, λ3, λ4 are used as wavelengths of input signal light Ps1, Ps2, Ps3, and Ps4 before conversion. Four wavelengths λ6, λ7, λ8, and λ9 are used as the wavelengths of the subsequent wavelength converted lights Po1, Po2, Po3, and Po4. In practice, for example, λ1, λ2, λ3, λ4, λ6, λ7, λ
The wavelengths of 8, λ9 are 1551 nm, 15
52nm, 1553nm, 1554nm, 1556n
m, 1557 nm, 1558 nm, and 1559 nm.

In FIG. 8, reference numeral 201 denotes an optical fiber for inputting a wavelength multiplexed signal light, 202 denotes an optical fiber for inputting a pump light,
206 is an optical wavelength demultiplexer, 207 to 214 are optical waveguides or optical fibers, 215 is a 4-input / 4-output optical switch,
216 to 219 are two-input and one-output optical couplers;
23 is an optical wavelength converter, 224 is an optical multiplexer, and 225 is an optical fiber for optical output.

As shown in FIG. 8, an optical wavelength conversion device (multi-wavelength batch conversion device) according to the second embodiment has a wavelength λ corresponding to a wavelength multiplexed signal light input optical fiber 201 (corresponding to 301 in FIG. 3).
1, λ2, λ3, λ4 wavelength multiplexed signal light Ps1, Ps
2, Ps3 and Ps4 are connected to the pump light input optical fiber 20.
2 (corresponding to 302 in FIG. 3) whose wavelengths are λ6, λ7, λ8,
When the pump lights Pp1, Pp2, Pp3, and Pp4 of λ9 are respectively input, the signal light Ps1 of the wavelength λ1 is supplied to the optical waveguide 207 (corresponding to 312 in FIG.
(Corresponding to 313 in FIG. 3) includes the signal light Ps2 having the wavelength λ2.
However, the optical waveguide 209 (corresponding to 314 in FIG. 3) has a wavelength λ.
The signal light Ps3 having a wavelength of λ4 is supplied to the optical waveguide 210 (corresponding to 315 in FIG. 3).
(Corresponding to 316 in FIG. 3) includes a pump light Pp1 having a wavelength λ6.
However, the optical waveguide 212 (corresponding to 317 in FIG. 3) has a wavelength λ.
7 is supplied to the optical waveguide 213 (318 in FIG. 3).
), The pump light Pp3 having the wavelength λ8 is
14 (corresponding to 319 in FIG. 3) has pump light P of wavelength λ9.
p4 is output.

The optical waveguides 207 to 210 are connected to the optical switch 21.
5, the wavelengths are λ1, λ2, λ3, λ
The signal light Ps1, Ps2, Ps3, and Ps4 of No. 4 are transmitted through optical couplers 216 to 219 to an arbitrary optical wavelength converter 220.
To 223. On the other hand, the pump light Pp1, Pp
2, Pp3 and Pp4 are also input to the respective optical wavelength converters 220 to 223 through the optical couplers 216 to 219. Therefore, by modulating the input signal light Ps1, Ps2, Ps3 and Ps4 arbitrarily, each optical wavelength converter is converted. 220-2
At 23, wavelength conversion is performed.

For example, by using a semiconductor optical amplifying element as an optical wavelength conversion element of an optical wavelength converter and injecting a certain optimum bias current, the gain of the pump light decreases when the input signal light is on. When the input signal light is off, the gain of the pump light recovers.
So-called mutual gain modulation occurs, and inverter-type wavelength conversion occurs. That is, the pump light Pp1, Pp2, Pp
3, wavelength converted light Po1, Po2, Po3, Po4 having wavelengths λ6, λ7, λ8, λ9 of Pp4 and signal information of input signal lights Ps1, Ps2, Ps3, Ps4.
This is multiplexed by the optical multiplexer 224, and the output optical fiber 22
5 enables batch conversion of multiple wavelengths. In addition, by changing the input / output of the optical switch 215, the order of the wavelength to be converted can be changed.

Here, a feature of the present invention is that the order of the wavelength to be converted can be changed by changing the input / output of the optical switch 215. For example, if the optical switches 215 are all connected in a through-type manner as shown in FIG. 4, the optical wavelength converter 220 receives the signal light Ps1 having the wavelength λ1 and the pump light Pp1 having the wavelength λ6, and the optical wavelength converter 221. Is a signal light Ps2 having a wavelength of λ2 and a pump light Pp2 having a wavelength of λ7, the optical wavelength converter 222 has a signal light Ps3 having a wavelength of λ3 and a pump light Pp3 having a wavelength of λ8, and the optical wavelength converter 223 has a wavelength. Is λ4 and the wavelength is λ4.
9 are respectively input, and as a result, the wavelength of the signal light is changed from the wavelength λ1 to the wavelength λ6 to the wavelength λ6.
2 to wavelength λ7, wavelength λ3 to wavelength λ8, wavelength λ4
Is converted to a wavelength λ9 at once.

On the other hand, as shown in FIG.
When the 15 output ports are connected by being shifted by one stage, the pump light input to each of the optical wavelength converters 220 to 223 does not change, and only the signal light changes. In this case, the optical wavelength converter 2
20 is a signal light Ps4 having a wavelength of λ4 and a pump light Pp1 having a wavelength of λ6. An optical wavelength converter 221 is provided with a signal light Ps1 having a wavelength of λ1 and a pump light Pp2 having a wavelength of λ7. Are the signal light Pp2 having the wavelength λ2 and the signal light Pp2 having the wavelength λ8.
Pump light Pp3 is transmitted to the optical wavelength converter 223 and the wavelength is λ.
The signal light Ps3 of No. 3 and the pump light Pp4 of wavelength λ9 are input. As a result, the wavelength of the signal light is changed from wavelength λ4 to wavelength λ6, from wavelength λ1 to wavelength λ7, and from wavelength λ2 to wavelength λ.
8, the multi-wavelength conversion from the wavelength λ3 to the wavelength λ9 can be performed at once.

In addition to the above, since the connection of the optical switch 215 can be changed freely, multi-wavelength batch conversion between arbitrary wavelengths is possible, and a network configuration with a high degree of freedom is possible. Here, multi-wavelength batch conversion between adjacent wavelengths (from signal light of 1551 to 1554 nm to 155
Although only the wavelength conversion from 6 to 1559 nm has been described, by changing the wavelength of the pump light, multi-wavelength batch conversion to a farther wavelength (for example, from 1.55 μm band to 1.55 nm) is performed.
(58 μm band) is also possible.

Third Embodiment Next, an optical wavelength converter according to a third embodiment of the present invention will be described with reference to FIG. In the following embodiments including the third embodiment, the optical coupler used in the first and second embodiments is not required. As described above, by adopting a configuration in which the optical coupler is not used, there is obtained an advantage that the optical loss (3 dB or more) in the optical coupler is eliminated and the polarization dependence in the optical coupler is eliminated.

FIG. 9 is a block diagram showing a schematic configuration of an optical wavelength converter (multi-wavelength batch converter) according to a third embodiment of the present invention. Here, in order to simplify the description, a WDM system using four wavelengths is assumed, and the wavelengths of the input signal lights Ps1, Ps2, Ps3, and Ps4 before conversion are λ1, λ.
Wavelength converted light P after conversion using four wavelengths of 2, λ3 and λ4
The wavelengths of o1, Po2, Po3 and Po4 are λ5 and λ
Four wavelengths of 6, λ7 and λ8 are used. In practice, for example,
The wavelengths of λ1, λ2, λ3, λ4, λ5, λ6, λ7, λ8 are 1551 nm, 1552 nm, 1
553nm, 1554nm, 1555nm, 1556n
m, 1557 nm and 1558 nm.

In FIG. 9, reference numeral 401 denotes an optical fiber for inputting a wavelength multiplexed signal light, and 402 denotes a pump light Pp1 having a wavelength of λ5.
403 is a pump light input optical fiber for inputting the pump light Pp2 having a wavelength of λ6, and 404 is a pump light input optical fiber having a wavelength of λ7.
405, an optical fiber for pump light input for inputting 3
Is a pump light input optical fiber for inputting a pump light Pp4 having a wavelength of λ8, 406 is an optical wavelength demultiplexer, and 407 to
414 is an optical waveguide or optical fiber, 415 is a 4-input / 4-output optical switch, 416 to 419 are optical waveguides or optical fibers, 420 to 423 are cross-phase modulation type optical wavelength converters, 424 is an optical multiplexer, and 425 is an output. Optical fiber.

The four signal light output ports of the optical wavelength demultiplexer 406 and the four switch input ports of the optical switch 415 are individually connected by optical waveguides (or optical fibers) 407 to 410. The four pump light output ports of the optical wavelength demultiplexer 406 are individually connected to the cross-phase modulation type optical wavelength converters 420 to 423 by optical waveguides (or optical fibers) 411 to 414. The four switch output ports of the optical switch 415 are individually connected to the cross-phase modulation type optical wavelength converters 420 to 423 by optical waveguides (or optical fibers) 416 to 419. The optical switch 415 can switch light (signal light) output from each switch output port by performing a switching operation.

As shown in FIG. 9, the optical wavelength conversion device (multi-wavelength batch conversion device) of the third embodiment uses a wavelength multiplexing optical fiber 401 for wavelength-division multiplexed signal light to input wavelengths λ1, λ2, λ3, and λ4. The signal light Ps1, Ps2, Ps3, Ps4, the pump light Pp1 having a wavelength of λ5 to the pump light input optical fiber 402, and the wavelength λ to the pump light input optical fiber 403.
6 into the pump light input optical fiber 40.
4, the pump light Pp3 having a wavelength of λ7 is input to the optical fiber 405 for inputting pump light, and the pump light Pp4 having a wavelength of λ8 is input to the optical fiber 405.
s1 is the signal light Ps2 having the wavelength λ2 in the optical waveguide 408.
The optical waveguide 409 receives the signal light Ps3 having the wavelength λ3, the optical waveguide 410 receives the signal light Ps4 having the wavelength λ4, the optical waveguide 411 receives the pump light Pp1 having the wavelength λ5, and the optical waveguide 41.
2, the pump light Pp2 having the wavelength λ6 is output to the optical waveguide 413, and the pump light Pp4 having the wavelength λ8 is output to the optical waveguide 414.

The optical waveguides 407 to 410 are connected to the optical switch 41.
5, the wavelengths are λ1, λ2, λ3, λ
The signal light beams Ps1, Ps2, Ps3, and Ps4 of No. 4 are input to the cross-phase modulation type optical wavelength converters 420 to 423.
On the other hand, since the pump lights Pp1, Pp2, Pp3, and Pp4 are also input to the respective cross-phase modulation type optical wavelength converters 420 to 423, the input signal lights Ps1, Ps2, Ps3, P
The wavelength of s4 can be converted. The principle of the cross-phase modulation type wavelength conversion will be described later.

Here, a feature of the present invention is that the order of the wavelength to be converted can be changed by changing the input / output of the optical switch 415. For example, the signal light Ps1 having the wavelength λ1 is output to the optical waveguide 416, the signal light Ps2 having the wavelength λ2 is output to the optical waveguide 417, the signal light Ps3 having the wavelength λ3 is output to the optical waveguide 418, and the wavelength λ4 is output. When the optical switch 415 is switched so as to output the signal light Ps4 to the optical waveguide 419, the signal light Ps1 having the wavelength λ1 and the pump light Pp1 having the wavelength λ5 are transmitted to the optical wavelength converter 420. The optical device 421 has a signal light Ps2 having a wavelength of λ2 and a pump light Pp2 having a wavelength of λ6.
However, the optical wavelength converter 422 has a signal light Ps3 having a wavelength of λ3.
And the pump light Pp3 having a wavelength of λ7 are output from the optical wavelength converter 423.
Is input with the signal light Ps4 having the wavelength λ4 and the pump light Pp4 having the wavelength λ8.

For this reason, the wavelength converter 420 outputs the wavelength-converted light Po1 having the wavelength λ5 and the signal information of the signal light Ps1, and the optical wavelength converter 421 outputs the signal light Ps2 having the wavelength λ6. Wavelength converted light Po having signal information
2 is output, and the wavelength is λ7
Outputs the converted wavelength light Po3 having the signal information of the signal light Ps3, and the optical wavelength converter 423 outputs the converted wavelength light Po4 having the wavelength λ8 and having the signal information of the signal light Ps4. These wavelength converted lights Po1, Po2, Po3,
Po4 is multiplexed by the optical multiplexer 424, wavelength-multiplexed, and output from the output optical fiber 425. As a result, the wavelength of the signal light can be batch-converted from wavelength λ1 to wavelength λ5, from wavelength λ2 to wavelength λ6, from wavelength λ3 to wavelength λ7, and from wavelength λ4 to wavelength λ8.

On the other hand, the signal light Ps4 having the wavelength λ4
Is output to the optical waveguide 416, and the signal light Ps1 having the wavelength of λ1 is output.
Is output to the optical waveguide 417, and the signal light Ps2 having the wavelength of λ2 is output.
Is output to the optical waveguide 418, and the signal light Ps3 having the wavelength of λ3 is output.
Is output to the optical waveguide 419 so that the optical switch 415
Are switched, the optical wavelength converter 420 supplies the signal light Ps4 having the wavelength λ4 and the pump light Pp having the wavelength λ5 to the optical wavelength converter 420.
1 is transmitted to the optical wavelength converter 421 by a signal light Ps having a wavelength of λ1.
1 and the pump light Pp2 having the wavelength λ6 are
2, the signal light Ps2 having the wavelength λ2 and the pump light Pp3 having the wavelength λ7 are input to the optical wavelength converter 423, and the signal light Ps3 having the wavelength λ3 and the pump light Pp4 having the wavelength λ8 are input to the optical wavelength converter 423.

Therefore, the wavelength converter 420 outputs the wavelength converted light Po1 having the wavelength λ5 and the signal information of the signal light Ps4, and the optical wavelength converter 421 outputs the wavelength converted light Po1 having the wavelength λ6 and the signal light Ps1. Wavelength converted light Po having signal information
2 is output, and the wavelength is λ7
Outputs the converted wavelength light Po3 having the signal information of the signal light Ps2, and the optical wavelength converter 423 outputs the converted wavelength light Po4 having the wavelength of λ8 and having the signal information of the signal light Ps3. These wavelength converted lights Po1, Po2, Po3,
Po4 is multiplexed by the optical multiplexer 424, wavelength-multiplexed, and output from the output optical fiber 425. As a result, the wavelength of the signal light can be batch-converted from wavelength λ1 to wavelength λ6, from wavelength λ2 to wavelength λ7, from wavelength λ3 to wavelength λ8, and from wavelength λ4 to wavelength λ5.

In addition to the above, since the connection of the optical switch 415 can be freely changed, batch conversion of multiple wavelengths between arbitrary wavelengths becomes possible, and a network configuration with a high degree of freedom becomes possible. Here, multi-wavelength batch conversion between adjacent wavelengths (from signal light of 1551 to 1554 nm to 155
Although only the wavelength conversion from 6 to 1559 nm has been described, by changing the wavelength of the pump light, multi-wavelength batch conversion to a farther wavelength (for example, from 1.55 μm band to 1.55 nm) is performed.
(58 μm band) is also possible.

Here, the cross-phase modulation type optical wavelength converter 42
The configuration and operation of 0 to 423 will be described with reference to FIG. Here, the cross-phase modulation type optical wavelength converter 4
20 will be described.

In FIG. 10 showing the cross-phase modulation type optical wavelength converter 420, 420a and 420b are semiconductor optical amplifiers, 420c and 420d are optical multiplexer / demultiplexers, and 420e is an optical multiplexer. In this cross-phase modulation type optical wavelength converter 420, the pump light Pp1 having a wavelength of λ5 is supplied to the optical multiplexer / demultiplexer 420c.
And enters the semiconductor optical amplification elements 420a and 420b. On the other hand, for example, when the signal light Ps1 having a wavelength of λ1 is incident on the semiconductor optical amplifier 420a via the optical multiplexer 420e, the carrier density of the semiconductor optical amplifier 420a decreases due to a saturation phenomenon, and the refractive index decreases due to the decrease in carrier density. Change is triggered. As a result, the semiconductor optical amplifier 4
When the light that has passed through 20a and the semiconductor optical amplifier 420b is coupled by the optical multiplexer / demultiplexer 420d, a phase change appears as an intensity change. Therefore, the cross-phase modulation type optical wavelength converter 420 outputs a converted signal light Po1 having a wavelength of λ5 and having signal information of the signal light Ps1. Of course, other signal light Ps2, Ps
3 and Ps4, the converted signal light Po1 having a wavelength of λ5 and having the signal information of the signal lights Ps2, Ps3 and Ps4 is output. The same applies to the configuration and operation of the other cross-phase modulation type optical wavelength converters 421, 422, and 423.

(Embodiment 4) FIG. 11 is a block diagram showing a schematic configuration of an optical wavelength conversion apparatus (multi-wavelength batch conversion apparatus) according to Embodiment 4 of the present invention. Here, for simplicity of description, a WDM system using four wavelengths is assumed, and four wavelengths λ1, λ2, λ3, λ4 are used as wavelengths of input signal light Ps1, Ps2, Ps3, and Ps4 before conversion. Four wavelengths λ5, λ6, λ7, and λ8 are used as the wavelengths of the subsequent wavelength converted lights Po1, Po2, Po3, and Po4. In practice, for example, λ1, λ2, λ3, λ4, λ5, λ6,
The wavelengths of λ7 and λ8 are 1551 nm, 1
552 nm, 1553 nm, 1554 nm, 1555n
m, 1556 nm, 1557 nm, and 1558 nm.

In FIG. 11, reference numeral 501 denotes an optical fiber for inputting a wavelength multiplexed signal light, 506 denotes an optical wavelength demultiplexer, and 507 to 507.
14 is an optical waveguide or optical fiber, 515 is 4 inputs and 4
Output optical switches, 516 to 519 are optical waveguides or optical fibers, 520 to 523 are mutual gain modulation type optical wavelength converters, 524 is an optical wavelength multiplexer / demultiplexer, 525 is an output optical fiber, 530 is an optical circulator, 532 Reference numerals 534 denote optical fiber gratings.

The four signal light output ports of the optical wavelength demultiplexer 506 and the four switch input ports of the optical switch 515 are individually connected by optical waveguides (or optical fibers) 507 to 510. The four switch output ports of the optical switch 515 are individually connected to the mutual gain modulation type optical wavelength converters 520 to 523 by optical waveguides (or optical fibers) 511 to 514. The optical wavelength converters 520 to 523 are connected to an optical wavelength multiplexer / demultiplexer 524 by optical waveguides (or optical fibers) 516 to 519. Also, the optical switch 515
Can switch light (signal light) output from each switch output port by performing a switching operation. Optical fiber gratings 531 to 53
Reference numeral 4 is interposed in the optical waveguides 511 to 514 and reflects light having wavelengths of λ5, λ6, λ7, and λ8.

As shown in FIG. 11, the optical wavelength conversion device (multi-wavelength batch conversion device) of the fourth embodiment has a wavelength λ1, λ2, λ3, λ4
When the wavelength multiplexed signal light Ps1, Ps2, Ps3, and Ps4 are input to the optical waveguide 507, the signal light Ps1 having the wavelength λ1
However, the signal light Ps2 having the wavelength λ2 is output to the optical waveguide 508, the signal light Ps3 having the wavelength λ3 is output to the optical waveguide 509, and the signal light Ps4 having the wavelength λ4 is output to the optical waveguide 510. Since the optical waveguides 507 to 510 are connected to the optical switch 515, the signal lights Ps1, Ps2, Ps3, and Ps4 having wavelengths of λ1, λ2, λ3, and λ4 are transmitted to the mutual gain modulation type optical wavelength converters 520 to 523. Is entered.

On the other hand, via the optical circulator 530,
Pump lights Pp1, Pp having wavelengths λ5, λ6, λ7, λ8
When 2, Pp3 and Pp4 are input to the output side of the optical wavelength multiplexer / demultiplexer 524, the pump light Pp1 having the wavelength λ5 is supplied to the optical waveguide 516, and the pump light Pp having the wavelength λ6 is supplied to the optical waveguide 517.
2 is a pump light Pp3 having a wavelength λ7
However, pump light Pp4 of wavelength λ8 is output to the optical waveguide 519. Since the optical waveguides 516 to 519 are connected to the mutual gain modulation type optical wavelength converters 520 to 523, each pump light Pp having a wavelength of λ5, λ6, λ7, λ8.
1, Pp2, Pp3, and Pp4 are input to the cross gain modulation type optical wavelength converters 520 to 523.

After all, the cross gain modulation type optical wavelength converter 520
Includes any one of the signal lights Ps1 to Ps4 (for example, Ps1 having a wavelength of λ1) and the pump light Pp having a wavelength of λ5.
1 is input. Then, the cross gain modulation type optical wavelength converter 520 outputs the wavelength converted light Po1 having the wavelength λ5 and the signal information of the signal light Ps1 to the optical waveguide 511.
The wavelength-converted light Po1 travels toward the optical switch 515, but is reflected by the optical fiber grating 531.
The reflected wavelength converted light Po1 passes through the mutual gain modulation type optical wavelength converter 520 again and is incident on the optical wavelength multiplexer / demultiplexer 524.

Similarly, a cross gain modulation type optical wavelength converter 52
1 to 523 include any one of the signal lights Ps1 to Ps4 (for example, Ps2 to Ps4 having wavelengths of λ2 to λ4);
Pump lights Pp2 to Pp4 having wavelengths of λ6 to λ8 are input. Then, the mutual gain modulation type optical wavelength converters 521-521
523 outputs the wavelength converted lights Po2 to Po4 having the wavelengths of λ6 to λ8 and the signal information of the signal lights Ps2 to Ps4 to the optical waveguides 512 to 514. The wavelength-converted lights Po2 to Po
O4 advances toward the optical switch 515, but is reflected by the optical fiber gratings 532 to 534. The reflected wavelength-converted lights Po2 to Po4 again pass through the mutual gain modulation type optical wavelength converters 521 to 523, and are then coupled to the optical wavelength multiplexer / demultiplexer 52.
4 is incident.

The optical wavelength multiplexer / demultiplexer 524 outputs the wavelength-converted light Po.
The wavelength-multiplexed wavelength-converted lights Po1 to Po4 pass through the optical circulator 530 and are output via the output fiber 525.

Here, a feature of the present invention is that the order of the wavelength to be converted can be changed by changing the input / output of the optical switch 515. For example, the signal light Ps1 having the wavelength λ1 is output to the optical waveguide 511, the signal light Ps2 having the wavelength λ2 is output to the optical waveguide 512, the signal light Ps3 having the wavelength λ3 is output to the optical waveguide 513, and the wavelength λ4 is output. When the optical switch 515 is switched so as to output the signal light Ps4 to the optical waveguide 514, the optical wavelength converter 520 outputs the signal light Ps1 having the wavelength λ1 and the pump light Pp1 having the wavelength λ5 to the optical wavelength conversion. The signal light Ps2 having a wavelength of λ2 and the pump light Pp2 having a wavelength of λ6 are
However, the optical wavelength converter 522 has a signal light Ps3 having a wavelength of λ3.
And a pump light Pp3 having a wavelength of λ7 are output from the optical wavelength converter 523.
Is input with the signal light Ps4 having the wavelength λ4 and the pump light Pp4 having the wavelength λ8.

Therefore, the optical wavelength converter 520 outputs the wavelength converted light Po1 having the wavelength λ5 and the signal information of the signal light Ps1, and the optical wavelength converter 521 outputs the wavelength light λ6 and the signal light Ps2. Wavelength converted light Po having signal information
2 is output, and the wavelength is λ7 from the optical wavelength converter 522.
Outputs the wavelength converted light Po3 having the signal information of the signal light Ps3, and the optical wavelength converter 523 outputs the wavelength converted light Po4 having the wavelength λ8 and having the signal information of the signal light Ps4. These wavelength converted lights Po1, Po2, Po3,
Po4 is an optical fiber grating 531, 532,
The light is reflected by 533 and 534, multiplexed by an optical multiplexer / demultiplexer 524, wavelength-multiplexed, and output from an output optical fiber 525. As a result, the wavelength of the signal light is changed from wavelength λ1 to wavelength λ5, from wavelength λ2 to wavelength λ6, and from wavelength λ3 to wavelength λ.
As shown in FIG. 7, multi-wavelength conversion from wavelength λ4 to wavelength λ8 can be performed at once.

On the other hand, the signal light Ps4 having the wavelength λ4
Is output to the optical waveguide 511, and the signal light Ps1 having the wavelength of λ1 is output.
Is output to the optical waveguide 512, and the signal light Ps2 having the wavelength of λ2 is output.
Is output to the optical waveguide 513, and the signal light Ps3 having the wavelength of λ3 is output.
Is output to the optical waveguide 514 so that the optical switch 515
Are switched, the optical wavelength converter 520 supplies the signal light Ps4 having the wavelength λ4 and the pump light Pp having the wavelength λ5 to the optical wavelength converter 520.
1 is transmitted to the optical wavelength converter 521 by a signal light Ps having a wavelength of λ1.
1 and a pump light Pp2 having a wavelength of λ6
2, the signal light Ps2 having the wavelength λ2 and the pump light Pp3 having the wavelength λ7 are input to the optical wavelength converter 523, and the signal light Ps3 having the wavelength λ3 and the pump light Pp4 having the wavelength λ8 are input to the optical wavelength converter 523.

Therefore, the optical wavelength converter 520 outputs the wavelength converted light Po1 having the wavelength λ5 and the signal information of the signal light Ps4. The optical wavelength converter 521 outputs the wavelength converted light Po1 having the wavelength λ6 and the signal light Ps1. Wavelength converted light Po having signal information
2 is output, and the wavelength is λ7 from the optical wavelength converter 522.
Outputs the wavelength converted light Po3 having the signal information of the signal light Ps2, and the optical wavelength converter 523 outputs the wavelength converted light Po4 having the wavelength λ8 and having the signal information of the signal light Ps3. These wavelength converted lights Po1, Po2, Po3,
Po4 is an optical fiber grating 531, 532,
The light is reflected by 533 and 534, multiplexed by an optical multiplexer 524, wavelength-multiplexed, and output from an output optical fiber 525. As a result, the wavelength of the signal light is changed from the wavelength λ1 to the wavelength λ.
6, wavelength λ2 to wavelength λ7, wavelength λ3 to wavelength λ8
In addition, multi-wavelength batch conversion from wavelength λ4 to wavelength λ5 can be performed.

In addition to the above, since the connection of the optical switch 515 can be changed freely, multi-wavelength batch conversion between arbitrary wavelengths is possible, and a network configuration with a high degree of freedom is possible. Here, multi-wavelength batch conversion between adjacent wavelengths (from signal light of 1551 to 1554 nm to 155
Although only the wavelength conversion from 6 to 1559 nm has been described, by changing the wavelength of the pump light, multi-wavelength batch conversion to a farther wavelength (for example, from 1.55 μm band to 1.55 nm) is performed.
(58 μm band) is also possible.

Here, the cross gain modulation type optical wavelength converter 52
The configuration and operation of 0 to 523 will be described with reference to FIG. Here, the cross gain modulation type optical wavelength converter 5
20 will be described.

In FIG. 12 showing a cross gain modulation type optical wavelength converter 520, 520a is a semiconductor optical amplifier,
b is a filter that cuts off the signal light. In the mutual gain modulation type optical wavelength converter 520, the pump light Pp1 having a wavelength of λ5 is incident, and the semiconductor optical amplifier 520a is saturated. At this time, when the signal light Ps1 having the wavelength λ1 is input, the pump light Pp1 is output when the intensity of the signal light Ps1 is high.
At the wavelength λ5. Therefore, the wavelength is λ5 from the mutual gain modulation type optical wavelength converter 520.
The converted signal light Po1 having the signal information of the signal light Ps1 is output. Of course, other signal light Ps
2, Ps3 and Ps4 are input, the wavelength is λ5
The converted signal light Po1 having the signal information of the signal lights Ps2, Ps3, and Ps4 is output. Other cross gain modulation type optical wavelength converters 521, 522, 523
The same applies to the configuration and operation of.

(Embodiment 5) FIG. 13 is a block diagram showing a schematic configuration of an optical wavelength conversion apparatus (multi-wavelength batch conversion apparatus) according to Embodiment 5 of the present invention. Here, in order to simplify the description, a WDM system using four wavelengths is assumed, and four wavelengths λ1, λ2, λ3, λ4 are used as the wavelengths of the input signal lights Ps1, Ps2, Ps3, and Ps4 before conversion.

In FIG. 13, reference numeral 601 denotes an optical fiber for inputting a wavelength multiplexed signal light, 602 denotes an optical fiber for inputting a pump light, 606 denotes an optical wavelength demultiplexer, 607 to 614 denote optical waveguides or optical fibers, and 615 denotes a four-input four-input optical fiber. Output optical switches, 616 to 619 are optical waveguides or optical fibers, 6
20 to 623 are four-wave mixing optical wavelength converters, 624 is an optical wavelength multiplexer / demultiplexer, and 625 is an output optical fiber.

The four signal light output ports of the optical wavelength demultiplexer 606 and the four switch input ports of the optical switch 615 are individually connected by optical waveguides (or optical fibers) 607 to 610. The four switch output ports of the optical switch 615 are individually connected to four-wave mixing optical wavelength converters 620 to 623 by optical waveguides (or optical fibers) 611 to 614. The four-wave mixing optical wavelength converters 620 to 623 are connected to the optical wavelength multiplexer / demultiplexer 6 by optical waveguides (or optical fibers) 616 to 619.
24. The optical switch 615 can switch light (signal light) output from each switch output port by performing a switching operation.

As shown in FIG. 13, the optical wavelength conversion device (multi-wavelength batch conversion device) of the fifth embodiment has a wavelength λ1, λ2, λ3, λ4
When the wavelength multiplexed signal light Ps1, Ps2, Ps3, and Ps4 are input to the optical waveguide 607, the signal light Ps1 having the wavelength λ1
However, the signal light Ps2 having the wavelength λ2 is output to the optical waveguide 608, the signal light Ps3 having the wavelength λ3 is output to the optical waveguide 609, and the signal light Ps4 having the wavelength λ4 is output to the optical waveguide 610. Since the optical waveguides 607 to 610 are connected to the optical switch 615, the signal lights Ps1, Ps2, Ps3, and Ps4 having wavelengths of λ1, λ2, λ3, and λ4 are transmitted to the four-wave mixing optical wavelength converters 620 to 623. Is entered.

On the other hand, the pump light Pp having wavelengths of λ5, λ6, λ7, λ8 is
1, Pp2, Pp3, and Pp4 are combined with the optical wavelength multiplexer / demultiplexer 624.
, An optical waveguide 616 receives a pump light Pp1 having a wavelength λ5, an optical waveguide 617 receives a pump light Pp2 having a wavelength λ6, an optical waveguide 618 receives a pump light Pp3 having a wavelength λ7, and an optical waveguide 619. Is the pump light Pp of wavelength λ8
4 are output. Since the optical waveguides 616 to 619 are connected to the four-wave mixing optical wavelength converters 620 to 623, each pump light P having a wavelength of λ5, λ6, λ7, λ8 is provided.
p1, Pp2, Pp3, and Pp4 are input to the four-wave mixing optical wavelength converters 620 to 623.

After all, any one of the signal lights Ps1 to Ps4 (for example, Ps1 having the wavelength λ1) and the pump light Pp1 having the wavelength λ5 are supplied to the four-wave mixing optical wavelength converter 620.
Is entered. Then, the four-wave mixing optical wavelength converter 620 outputs the wavelength λ defined by the wavelength λ1 and the wavelength λ5.
The wavelength-converted light Po1 having the signal information of 15 and the signal information of the signal light Ps1 is generated. The wavelength λ15 is
This is a wavelength at a position symmetrical to the signal light wavelength λ1 with the pump light wavelength λ5 as the central axis. Then, the wavelength converted light Po1
Is incident on the optical wavelength multiplexer / demultiplexer 624 through the optical waveguide 616.

Similarly, the four-wave mixing optical wavelength converter 621
To 623 include any one of the signal lights Ps1 to Ps4.
(For example, Ps2 to Ps4 having wavelengths of λ2 to λ4) and pump lights Pp2 to Pp4 having wavelengths of λ6 to λ8 are input. Then, the four-wave mixing optical wavelength converters 621 to 6
Reference numeral 23 denotes a wavelength λ26 (wavelength defined by wavelengths λ2 and λ6), λ37 (wavelength defined by wavelengths λ3 and λ7), and λ48 (wavelength defined by wavelengths λ4 and λ8).
Wavelength conversion light P having signal information of signal light Ps2 to Ps4
o2 to Po4 are generated. And the wavelength-converted lights Po2 to P
O4 is input to the optical wavelength multiplexer / demultiplexer 624 through the optical waveguides 617 to 619.

The optical wavelength multiplexer / demultiplexer 624 outputs the wavelength-converted light Po.
1 to Po4 are wavelength-multiplexed and multiplexed and output. The wavelength-multiplexed wavelength-converted lights Po1 to Po4 are output from a fiber 6 for output.
25.

Here, a feature of the present invention is that the order of the wavelength to be converted can be changed by changing the input / output of the optical switch 615. For example, the signal light Ps1 having the wavelength λ1 is output to the optical waveguide 611, the signal light Ps2 having the wavelength λ2 is output to the optical waveguide 612, the signal light Ps3 having the wavelength λ3 is output to the optical waveguide 613, and the wavelength λ4 is output. When the optical switch 615 is switched so as to output the signal light Ps4 to the optical waveguide 614, the optical wavelength converter 620 converts the signal light Ps1 having the wavelength λ1 and the pump light Pp1 having the wavelength λ5 into the optical wavelength conversion. The optical device 621 has a signal light Ps2 having a wavelength of λ2 and a pump light Pp2 having a wavelength of λ6.
However, the optical wavelength converter 622 supplies the signal light Ps3 having the wavelength λ3
And the pump light Pp3 having a wavelength of λ7 is converted into an optical wavelength converter 623.
Is input with the signal light Ps4 having the wavelength λ4 and the pump light Pp4 having the wavelength λ8.

Therefore, the wavelength converter 620 outputs the wavelength converted light Po1 having the wavelength λ15 and the signal information of the signal light Ps1 and the optical wavelength converter 621 outputs the wavelength converted light Po1 having the wavelength λ26 and the signal light Ps2. The wavelength converted light Po2 having the signal information is output, and the wavelength converted light P2 having the wavelength λ37 and the signal information of the signal light Ps3 is output from the optical wavelength converter 622.
o3 is output, and the wavelength is λ from the optical wavelength converter 623.
The wavelength-converted light Po having the signal information of the signal light Ps4 at 48
4 is output. These wavelength converted lights Po1, Po2,
Po3 and Po4 are multiplexed by an optical multiplexer / demultiplexer 624, wavelength-multiplexed, and output from an output optical fiber 625.
As a result, the wavelength of the signal light is changed from the wavelength λ1 to the wavelength λ15.
Λ2 to λ26, λ3 to λ3
As shown in FIG. 7, multi-wavelength conversion from wavelength λ4 to wavelength λ48 can be performed.

On the other hand, the signal light Ps4 having the wavelength λ4
Is output to the optical waveguide 611, and the signal light Ps1 having the wavelength of λ1 is output.
Is output to the optical waveguide 612, and the signal light Ps2 having the wavelength of λ2 is output.
Is output to the optical waveguide 613, and the signal light Ps3 having the wavelength of λ3 is output.
Is output to the optical waveguide 614 so that the optical switch 615
Is switched, the optical wavelength converter 620 supplies the signal light Ps4 having the wavelength λ4 and the pump light Pp having the wavelength λ5 to the optical wavelength converter 620.
1 is transmitted to the optical wavelength converter 621 by a signal light Ps having a wavelength of λ1.
1 and the pump light Pp2 having a wavelength of λ6 are
2, the signal light Ps2 having the wavelength λ2 and the pump light Pp3 having the wavelength λ7 are input to the optical wavelength converter 623. The signal light Ps3 having the wavelength λ3 and the pump light Pp4 having the wavelength λ8 are input to the optical wavelength converter 623.

Therefore, the optical wavelength converter 620 outputs the wavelength converted light Po1 having the wavelength λ45 (the wavelength defined by the wavelengths λ4 and λ5) and having the signal information of the signal light Ps4. Outputs a wavelength converted light Po2 having a wavelength of λ16 (a wavelength defined by the wavelengths λ1 and λ6) and having the signal information of the signal light Ps1, and the optical wavelength converter 622 outputs the wavelength λ27 (the wavelengths λ2 and λ7). The wavelength-converted light Po3 having the signal information of the signal light Ps2 at the wavelength λ3 is output. The optical wavelength converter 623 outputs the wavelength-converted light Po3 with the wavelength λ38 (the wavelength defined by the wavelengths λ3 and λ8). Wavelength converted light P having signal information
o4 is output. These wavelength converted lights Po1, Po
2, Po3 and Po4 are multiplexed by the optical multiplexer 624,
The wavelength multiplexed signal is output from the output optical fiber 625. As a result, the wavelength of the signal light is changed from the wavelength λ1 to the wavelength λ1.
6, wavelength λ2 to wavelength λ27, wavelength λ3 to wavelength λ
38, the multi-wavelength conversion from the wavelength λ4 to the wavelength λ45 can be performed at once.

In addition to the above, since the connection of the optical switch 615 can be freely changed, multi-wavelength batch conversion between arbitrary wavelengths becomes possible, and a network configuration with a high degree of freedom becomes possible.

Here, a four-wave mixing type optical wavelength converter 620-620
The principle of 623 will be described with reference to FIG. When the signal light Ps and the pump light Pp are input to the four-wave mixing optical wavelength converter, new wavelength converted light Po is generated by four-wave mixing. At this time, the wavelength interval between the wavelength converted light Po and the pump light Pp is equal to the wavelength interval between the signal light Ps and the pump light Pp.
Here, by selecting only the wavelength conversion light Po by the optical filter (wavelength filter), only the wavelength can be converted while retaining the signal information of the signal light Ps.

(Embodiment 6) FIG. 15 is a block diagram showing a schematic configuration of an optical wavelength conversion device (multi-wavelength batch conversion device) according to Embodiment 6 of the present invention. Here, for simplicity of description, a WDM system using four wavelengths is assumed, and four wavelengths λ1, λ2, λ3, λ4 are used as wavelengths of input signal light Ps1, Ps2, Ps3, and Ps4 before conversion. Λ5, λ6, λ7, and λ8 are used as the wavelengths of the subsequent wavelength converted lights Po1, Po2, Po3, and Po4.

In FIG. 15, reference numeral 701 denotes an optical fiber for inputting a wavelength multiplexed signal light, 706 denotes an optical wavelength demultiplexer, and 707 to 7
14 is an optical waveguide or optical fiber, 715 is 4 inputs and 4
An output optical switch, 716 to 719 are optical waveguides or optical fibers, 720 to 723 are oscillation suppression type optical wavelength converters, 724 is an optical multiplexer, and 725 is an output optical fiber.

The four signal light output ports of the optical wavelength demultiplexer 706 and the four switch input ports of the optical switch 715 are individually connected by optical waveguides (or optical fibers) 707 to 710. The four switch output ports of the optical switch 715 are individually connected to the oscillation suppression type optical wavelength converters 720 to 723 by optical waveguides (or optical fibers) 711 to 714. The oscillation suppression type optical wavelength converters 720 to 723 are connected to the optical multiplexer 724 by optical waveguides (or optical fibers) 716 to 719. The optical switch 715 can switch light (signal light) output from each switch output port by performing a switching operation.

Oscillation suppression optical wavelength converters 720 to 723
Is composed of, for example, a distributed feedback semiconductor laser (DFB-LD) or the like, and the output light wavelength is λ5, λ6, λ7, λ.
It oscillates so that the state becomes 8. For this reason, when the signal light is input, it outputs converted signal lights Po1 to Po4 having an oscillation wavelength and signal information of the signal light.

As shown in FIG. 15, the optical wavelength conversion device (multi-wavelength batch conversion device) of the sixth embodiment has wavelengths λ1, λ2, λ3, λ4
When the wavelength multiplexed signal light Ps1, Ps2, Ps3, and Ps4 are input to the optical waveguide 707, the signal light Ps1 having the wavelength λ1
However, the signal light Ps2 having the wavelength λ2 is output to the optical waveguide 708, the signal light Ps3 having the wavelength λ3 is output to the optical waveguide 709, and the signal light Ps4 having the wavelength λ4 is output to the optical waveguide 710. Since the optical waveguides 707 to 710 are connected to the optical switch 715, the signal lights Ps1, Ps2, Ps3, and Ps4 having wavelengths of λ1, λ2, λ3, and λ4 are input to the oscillation suppression type optical wavelength converters 720 to 723. Is done.

After all, any one of the signal lights Ps1 to Ps4 (for example, Ps1 having a wavelength of λ1) is input to the oscillation suppression type optical wavelength converter 720. Then, the oscillation suppressing type optical wavelength converter 720 generates the wavelength converted light Po1 having the wavelength λ5 and having the signal information of the signal light Ps1.

Similarly, the oscillation suppression type optical wavelength converter 721 to 721
One of the signal lights Ps1 to Ps4 (for example, Ps2 to Ps4 having wavelengths of λ2 to λ4) is input to 723. Then, the oscillation suppression type optical wavelength converters 721 to 7
Reference numeral 23 generates wavelength-converted lights Po2 to Po4 having wavelengths λ6 to λ8 and having signal information of the signal lights Ps2 to Ps4. Then, the wavelength-converted lights Po2 to Po4 are output from the optical waveguides 717 to 717.
The light enters the optical multiplexer 724 through 19.

The optical multiplexer 724 includes wavelength-converted lights Po1 to Po
O4 is wavelength-multiplexed, multiplexed and output, and the wavelength-multiplexed wavelength-converted lights Po1 to Po4 are output via an output fiber 725.

Here, a feature of the present invention is that the order of wavelengths to be converted can be changed by changing the input / output of the optical switch 715. For example, the signal light Ps1 having the wavelength λ1 is output to the optical waveguide 711, the signal light Ps2 having the wavelength λ2 is output to the optical waveguide 712, the signal light Ps3 having the wavelength λ3 is output to the optical waveguide 713, and the wavelength λ4 is output. When the optical switch 715 is switched so as to output the signal light Ps4 to the optical waveguide 714, the signal light Ps1 having the wavelength λ1 is transmitted to the optical wavelength converter 720, and the signal light Ps1 having the wavelength λ2 is transmitted to the optical wavelength converter 721. The signal light Ps2, the signal light Ps3 having a wavelength of λ3 are input to the optical wavelength converter 722, and the signal light Ps4 having a wavelength of λ4 is input to the optical wavelength converter 723.

For this reason, the wavelength conversion light Po1 having the wavelength λ5 and the signal information of the signal light Ps1 is output from the optical wavelength converter 720, and the light wavelength converter 721 outputs the wavelength conversion light Po1 having the wavelength λ6 and the signal light Ps2. Wavelength converted light Po having signal information
2 is output, and the wavelength is λ7 from the optical wavelength converter 722.
Outputs the wavelength converted light Po3 having the signal information of the signal light Ps3, and the optical wavelength converter 723 outputs the wavelength converted light Po4 having the wavelength λ8 and having the signal information of the signal light Ps4. These wavelength converted lights Po1, Po2, Po3,
Po4 is multiplexed by the optical multiplexer 724, wavelength-multiplexed, and output from the output optical fiber 725. as a result,
The wavelength of the signal light can be batch-converted from wavelength λ1 to wavelength λ5, from wavelength λ2 to wavelength λ6, from wavelength λ3 to wavelength λ7, and from wavelength λ4 to wavelength λ8.

On the other hand, the signal light Ps4 having the wavelength λ4
To the optical waveguide 711, and the signal light Ps1 having the wavelength of λ1
Is output to the optical waveguide 712, and the signal light Ps2 having the wavelength of λ2 is output.
Is output to the optical waveguide 713, and the signal light Ps3 having the wavelength of λ3 is output.
Is output to the optical waveguide 714 so that the optical switch 715
Are switched, the signal light Ps4 of wavelength λ4 is sent to the optical wavelength converter 720, the signal light Ps1 of wavelength λ1 is sent to the optical wavelength converter 721, and the signal light Ps1 of wavelength λ2 is sent to the optical wavelength converter 722. The light Ps2 is input to the optical wavelength converter 723, and the signal light Ps3 having the wavelength λ3 is input.

For this reason, the wavelength-converted light Po1 having the wavelength λ5 and having the signal information of the signal light Ps4 is output from the optical wavelength converter 720, and the wavelength-converted light 721 is output from the optical wavelength converter 721 as the wavelength λ6. Wavelength converted light Po having signal information
2 is output, and the wavelength is λ7 from the optical wavelength converter 722.
Outputs the wavelength converted light Po3 having the signal information of the signal light Ps2, and the optical wavelength converter 723 outputs the wavelength converted light Po4 having the wavelength λ8 and having the signal information of the signal light Ps3. These wavelength converted lights Po1, Po2, Po3,
Po4 is multiplexed by the optical multiplexer 724, wavelength-multiplexed, and output from the output optical fiber 725. as a result,
The wavelength of the signal light can be batch-converted from wavelength λ1 to wavelength λ6, from wavelength λ2 to wavelength λ7, from wavelength λ3 to wavelength λ8, and from wavelength λ4 to wavelength λ5.

In addition to the above, since the connection of the optical switch 715 can be freely changed, batch conversion of multiple wavelengths between arbitrary wavelengths is possible, and a network configuration with a high degree of freedom is possible.

As described above, the invention made by the present inventor is:
Although specifically described based on the embodiment, the present invention
It is needless to say that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the scope of the invention.

[0093]

As described above, according to the present invention,
In the interconnection of networks multiplexing multiple wavelengths, the wavelength to be converted can be arbitrarily selected. In addition, the invention using no optical coupler has the advantage that the optical loss in the optical coupler is eliminated and the polarization dependence in the optical coupler is eliminated.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of an optical wavelength conversion device according to a first embodiment of the present invention.

FIG. 2 is a block diagram for explaining an 8-input / 8-output array type optical waveguide as one embodiment of the optical wavelength demultiplexer in the optical wavelength conversion device of the first embodiment.

FIG. 3 is an explanatory diagram showing an embodiment of input / output ports of an array-type optical waveguide grating in the optical wavelength conversion device of the first embodiment.

FIG. 4 is a schematic diagram illustrating a schematic configuration of an optical switch in the optical wavelength conversion device according to the first embodiment.

FIG. 5 is an explanatory diagram showing a conversion result when the optical switch of FIG. 4 is used in the optical wavelength conversion device of the first embodiment.

FIG. 6 is a schematic diagram illustrating a schematic configuration of another embodiment of the optical switch in the optical wavelength conversion device according to the first embodiment.

FIG. 7 is an explanatory diagram showing a conversion result when the optical switch of FIG. 6 is used in the optical wavelength conversion device of the first embodiment.

FIG. 8 is a block diagram illustrating a schematic configuration of an optical wavelength conversion device according to a second embodiment of the present invention.

FIG. 9 is a block diagram illustrating a schematic configuration of an optical wavelength conversion device according to a third embodiment of the present invention.

FIG. 10 is a configuration diagram illustrating a cross phase modulation type wavelength converter according to a third embodiment.

FIG. 11 is a block diagram illustrating a schematic configuration of an optical wavelength conversion device according to a fourth embodiment of the present invention.

FIG. 12 is a configuration diagram illustrating a cross gain modulation type wavelength converter according to a fourth embodiment.

FIG. 13 is a block diagram showing a schematic configuration of an optical wavelength conversion device according to a fifth embodiment of the present invention.

FIG. 14 is an explanatory diagram showing the principle of four-wave mixing optical modulation in the fifth embodiment.

FIG. 15 is a block diagram illustrating a schematic configuration of an optical wavelength conversion device according to a sixth embodiment of the present invention.

FIG. 16 is a block diagram showing a schematic configuration of a conventional optical wavelength conversion device (multi-wavelength batch conversion device).

[Explanation of symbols]

101,201,401,501,601,701,1001 Optical fiber for wavelength multiplexed signal light input 102 to 105,202,402 to 405,602,1002 Optical fiber for pump light input 106,206,406,506,606,706,1003 Optical wavelength demultiplexer 107 to 114,207 to 214,407 to 414,416 to 419,507 to 514,
516 to 519,607 to 614,616 to 619,1004 to 1007 Optical waveguide or optical fiber 115,215,415,515,615,715 4-input, 4-output optical switch 116 to 119,216 to 219 2-input, 1-output optical coupler 120 to 123,220 to 223,1008 to 1011 Optical wavelength converter 420 ~ 423 Cross-phase modulation type optical wavelength converter 520 ~ 523 Mutual gain modulation type optical wavelength converter 620 ~ 623 Four-wave mixing type optical wavelength converter 720 ~ 723 Oscillation suppression type optical wavelength converter 124,224,424,724,1012 Optical multiplexer 524,624 Wavelength multiplexer / demultiplexer 125,225,425,525,625,725,1013 Output optical fiber 301 to 308 Input optical waveguide 309,311 Slab waveguide 310 Array type optical waveguide 312 to 319 Output optical waveguide

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 10/02 H04B 9/00 T (72) Inventor Rieko Sato 2-3-1 Otemachi, Chiyoda-ku, Tokyo No. Nippon Telegraph and Telephone Corporation F term (reference) 2K002 AA02 AB01 AB02 AB04 AB05 AB12 BA01 CA13 DA08 EA14 EA16 HA16 HA31 5F073 AA64 AA67 AB25 AB28 BA01 5K002 BA05 BA06 CA05 DA02 DA13 FA01

Claims (6)

[Claims] 1. An optical wavelength demultiplexer, an n × n optical switch (where n is an integer of 2 or more), n two-input one-output optical couplers, n optical wavelength converters, and an optical multiplexer An optical wavelength converter comprising: a signal light input port for inputting n-wavelength wavelength multiplexed signal light propagating through an optical fiber; and the wavelength multiplexed signal light. N pump light input ports, n signal light output ports, n pump light output ports, and n pump light input ports for inputting pump light of n wavelengths having at least one of different wavelength intervals or wavelength bands one by one. Means for demultiplexing the n-wavelength multiplexed signal light input to the signal light input port to the n signal light output ports and outputting n pump lights to the n pump light output ports. The n × n optical switch is connected to the optical wavelength demultiplexer n N switch input ports for inputting the signal light propagating through the signal light output port, n switch output ports for outputting the signal light, and means for switching the signal light output from each switch output port. The n two-input and one-output optical couplers respectively transmit one wavelength signal light propagating through the selected one optical switch output port and one wavelength pump light propagating through one pump light output port. Means for injecting the signal light and the pump light into any one of the n optical wavelength converters after the multiplexing, wherein the n optical wavelength converters each include one signal light and 1
Means for outputting one wavelength-converted light having a wavelength defined by the wavelength of the pump light and signal information of the signal light from the two pump lights, wherein the optical multiplexer includes n of outputs of the n wavelength converters. An optical wavelength conversion device comprising means for multiplexing a plurality of wavelength converted lights into one wavelength multiplexed wavelength converted light. 2. The optical wavelength converter according to claim 1, wherein the optical wavelength demultiplexer inputs n wavelength (where n is an integer of 2 or more) wavelength multiplexed signal light propagating through the optical fiber. One signal light input port, and one pump light input port for inputting wavelength multiplexed pump light in which pump light of n wavelengths having at least one of different wavelength intervals or wavelength bands different from the wavelength multiplexed signal light is multiplexed; n signal light output ports, and n
The wavelength division multiplexed signal light of n wavelengths input to the pump light output port and the signal light input port is demultiplexed to the n signal light ports, and the n wavelength multiplexed pump light is divided into the n Means for splitting light into a pump light output port. 3. It has n (where n is an integer of 2 or more) signal light output ports and n pump light output ports.
When n-wavelength signal light and n-wavelength pump light whose wavelength is different from the wavelength of the signal light are input, one signal light output port outputs one signal light and one pump light output port. An optical wavelength demultiplexer branched so that one pump light is output from the optical wavelength demultiplexer; n switch input ports individually connected to n signal light output ports of the optical wavelength demultiplexer; An n × n optical switch for switching signal light output from each switch output port by performing a switching operation; and a switch output port of the n × n optical switch. 1
When one wavelength of signal light is input from one of the output ports and one wavelength of pump light is input from one of the signal light output ports of the optical wavelength demultiplexer, the wavelength is changed to a pump. N cross-phase-modulated optical wavelength converters that output wavelength-converted light having signal information of the same signal light as the wavelength of light, and n wavelengths output from each of the cross-phase-modulated optical wavelength converters An optical multiplexer for multiplexing the converted light and outputting the multiplexed converted light as wavelength multiplexed wavelength converted light. 4. It has n (where n is an integer of 2 or more) signal light output ports, and when signal light of n wavelengths is input, one signal light output port outputs one signal light. An optical wavelength demultiplexer that branches so as to be connected, n switch input ports individually connected to n signal light output ports of the optical wavelength demultiplexer, and n switch output ports. An n × n optical switch that switches signal light output from each switch output port by performing a switching operation; and one of the switch output ports of the n × n optical switch.
When one wavelength of signal light is input from the two output ports and one wavelength of pump light is input from the opposite side of the n × n optical switch, the wavelength is the same as the wavelength of the pump light and the signal light signal N pieces of mutual gain modulation type optical wavelength converters that output wavelength converted light having information to the n × n optical switch side, between the n × n optical switch and each mutual gain modulation type optical wavelength converter. N optical fiber gratings that are interposed and reflect the wavelength-converted light output from each mutual gain modulation type optical wavelength converter, and each mutual gain modulation type optical wavelength converter reflected by each optical fiber grating The wavelength-converted light that has passed through is multiplexed and output, and the wavelength n differs from the wavelength of the signal light.
An optical wavelength multiplexer / demultiplexer that individually sends each pump light to the mutual gain modulation type optical wavelength converter when pump light having a wavelength is input, and n-wavelength pump light is input to the wavelength converter,
An optical wavelength converter, comprising: an optical circulator that passes the multiplexed converted signal light. 5. It has n (where n is an integer of 2 or more) signal light output ports, and when signal light of n wavelengths is input, one signal light is output from one signal light output port. An optical wavelength demultiplexer, n switch input ports individually connected to n signal light output ports of the optical wavelength demultiplexer, and n switch output ports. An n × n optical switch that switches signal light output from each switch output port by performing a switching operation; and one of the switch output ports of the n × n optical switch.
When one wavelength of signal light is input from the two output ports and one wavelength of pump light is input from the opposite side of the n × n optical switch, the wavelength defined by the wavelengths of the pump light and the signal light N wavelength-converted optical wavelength converters that output wavelength-converted light having signal information of signal light, and combine wavelength-converted light output from each wavelength-converted optical wavelength converter. And an optical wavelength multiplexer / demultiplexer that individually sends each pump light to the four-wave mixing optical wavelength converter when n-wavelength pump light whose wavelength is different from the wavelength of the signal light is input. An optical wavelength conversion device comprising: 6. It has n (where n is an integer of 2 or more) signal light output ports, and when signal light of n wavelengths is input, one signal light output port outputs one signal light. An optical wavelength demultiplexer, n switch input ports individually connected to n signal light output ports of the optical wavelength demultiplexer, and n switch output ports. An n × n optical switch that switches signal light output from each switch output port by performing a switching operation; and one of the switch output ports of the n × n optical switch.
When one wavelength of signal light is input from the two output ports, n oscillation suppression types that output wavelength-converted light having a preset wavelength different from the wavelength of the signal light and having signal information of the signal light are output. An optical wavelength conversion device comprising: an optical wavelength converter; and an optical multiplexer that multiplexes and outputs wavelength converted light output from each of the oscillation suppression type optical wavelength converters.