JP2001141952A - Multiplexed wavelength batch-converting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mutually connect wavelength-multiplexed networks without opto-electric conversion and electro-optical conversion. SOLUTION: This is a multiplexed wavelength batch-converting device which has a wavelength-multiplexed signal light input port for inputting wavelength-multiplexed signal light, plural pump beam input ports for inputting pump beam of different wavelengths, and plural output ports for outputting single wavelength signal light in the wavelength-multiplexed signal light and its corresponding pump beam mentioned above, and is provided with a wavelength demultiplexing means for demultiplexing the unequally spaced wavelength multiplexed signal light into individual single wavelength signal light and outputting them with the pump beam, plural wavelength converting means which are connected to the plural output ports, respectively, and wavelength-converts the single wavelength signal light of the output ports by the pump beam outputted with it, and a wavelength multiplexing means for multiplexing the individual signal light converted by the plural wavelength converting means and outputting them to an optical waveguide for the wavelength converted outputs, the wavelength intervals of the wavelength multiplexed signal are different from those of the pump beam, and thereby the wavelength intervals of the inputted wavelength multiplexed signal light are converted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-wavelength batch converter, and more particularly, to optical communication, optical switching,
Irregular intervals applied to optical transmission systems such as optical information processing /
The present invention relates to a technology that is effective when applied to an equidistant multi-wavelength converter.

[0002]

2. Description of the Related Art An optical transmission system is an erbium-doped optical fiber amplifier (effective band: 1530 to 1560 nm:
Along with the 1.55 micron band).

Particularly in Japan, the chromatic dispersion of an optical signal is suppressed by using a so-called dispersion-shifted fiber that shifts the zero-dispersion wavelength of an optical fiber from a normal 1.3-micron band to a 1.55-micron band. For optical signals of a wavelength, high speed and long distance transmission of 500 km or more at 10 Gb / s is possible.

[0004] However, transmission using a dispersion-shifted fiber, on the other hand, has a large wavelength-to-wavelength interference with a wavelength multiplexed signal (WDM signal) in which a plurality of wavelengths are multiplexed. A scheme has been devised to make the wavelength intervals unequal.

On the other hand, North America and Europe use optical fibers having a zero-dispersion wavelength in a normal 1.3-micron band. This normal fiber transmission is disadvantageous for high-speed and long-distance transmission due to large chromatic dispersion of an optical signal. However, it is advantageous for WDM transmission, and the wavelength intervals of WDM signals can be made equal.

What is important here is the interconnection of unequally spaced WDM networks and equally spaced WDM networks. For example, when connecting from an unequally-spaced WDM network in which four waves are multiplexed to an equally-spaced WDM network in which four waves are multiplexed, eight waves with unequally spaced waves are conventionally split by an arrayed waveguide grating for unequally spaced waves. After that, the optical signals of each wavelength are converted into electric signals by eight light receivers, and the electric signals are further converted into optical signals by directly modulating the semiconductor lasers having eight equally spaced wavelengths. I was

FIG. 8 is a block diagram showing a schematic configuration of a conventional multi-wavelength conversion device. In FIG. 8, reference numeral 1001 denotes an input side optical fiber (for example, 15
50 nm, 1551 nm, 1553 nm, 1556 nm
1002 is an unequally spaced arrayed waveguide grating that splits unequally spaced wavelengths into four optical fibers;
Reference numerals 1003 to 1006 denote optical receivers for converting optical signals into electric signals, and reference numerals 1007 to 1010 denote discriminators / reproducers.
14 is an electric amplifier for amplifying electric signals, 1015 to 10
Reference numeral 18 denotes a bias tee for superimposing a DC bias current and an electric signal, and 1019 to 1022 denote oscillation wavelengths 1551 nm, 1552 nm, and 1553 n for converting an electric signal into an optical signal.
An m, 1554 nm semiconductor laser or modulator integrated semiconductor laser, 1023, is an array waveguide grating for equal intervals, and can convert unequally-spaced WDM signals into equally-spaced WDM signals by the above configuration.

FIG. 9 is a block diagram showing a schematic configuration of an array waveguide grating 1002 for equal intervals using a silica-based waveguide, a semiconductor waveguide, or a polymer waveguide.
101 is an input waveguide, 1102 and 1104 are slab waveguides, 1103 is an array waveguide, and 1105 to 1108 are output waveguides.

As shown in FIG. 9, a wavelength-division multiplexed signal light is input from an input waveguide 1101 to a slab waveguide 1102, and is distributed with a light intensity equal to that of the array waveguide 1103. The wavelength-division multiplexed signal light having a delay difference corresponding to the optical path length difference in the array waveguide 1103 is input to the slab waveguide 1104 and converges. At this time, since the phase conditions are different depending on the wavelength, different wavelengths are collected in each of the output waveguides 1105 to 1108. In FIG. 9, the output waveguide 1 is shown.
Since the reference numerals 105 to 1108 are arranged at equal intervals with respect to the slab waveguide 1104, the equally-spaced wavelength multiplexed signal light propagating through the input waveguide 1101 can be demultiplexed.

FIG. 10 is a block diagram showing a schematic configuration of an irregularly spaced arrayed waveguide grating 1002 using a silica-based waveguide, a semiconductor waveguide, or a polymer waveguide, wherein reference numeral 1201 denotes an input waveguide, and 1202 and 1204. Is a slab waveguide, 1203 is an array waveguide, 1205 to 12
08 is an output waveguide.

FIG. 10 shows output waveguides 1205 to 120.
8 are unequally spaced with respect to the slab waveguide 1204, the unequally spaced wavelength multiplexed signal light propagating through the input waveguide 1201 can be demultiplexed.

[0012]

However, in the above-mentioned conventional apparatus, the load of optical-electrical conversion and electric-optical conversion increases significantly as the scale of the network increases and the number of wavelengths and the number of interconnections increase. There was a problem of doing it.

[0013] Therefore, there is a demand for interconnection between networks multiplexing multiple wavelengths without using electric signals.

An object of the present invention is to provide a technique capable of interconnecting networks in which multiple wavelengths are multiplexed without using optical-to-electrical conversion and electrical-to-optical conversion.

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

[0016]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

(1) A wavelength multiplexed signal light input port to which wavelength multiplexed signal light is input, a plurality of pump light input ports to which pump lights of different wavelengths are input, and one wavelength of the wavelength multiplexed signal light Wavelength demultiplexing means having a plurality of output ports for outputting the signal light and the pump light corresponding thereto, demultiplexing the wavelength multiplexed signal light into signal light of one wavelength each, and outputting the signal light together with the pump light; A plurality of wavelength converters respectively connected to the plurality of output ports, for converting the wavelength of the signal light of one wavelength of the output port by the pump light output together, and each of the plurality of wavelength converters converted by the plurality of wavelength converters. A wavelength multiplexing means for multiplexing the signal lights of the above, and outputting the multiplexed signal light to the wavelength conversion output waveguide, wherein the wavelength interval of the wavelength multiplexed signal light and the wavelength interval of the pump light are different. Different By, and outputs different wavelength multiplexed signal wavelength interval is an input of the wavelength-multiplexed signal light. By doing so, it becomes possible to interconnect networks multiplexing multiple wavelengths without going through optical-to-electrical conversion and electrical-to-optical conversion.

(2) In the multi-wavelength batch converter of the means (1), the number of input ports for pump light of the wavelength demultiplexing means is larger than the number of output ports, and each output port of the wavelength demultiplexing means is provided. Wherein a plurality of pump lights having different wavelengths are output. This is useful when the number of wavelengths and the number of interconnections increase due to an increase in the scale of the network.

(3) In the multi-wavelength batch conversion apparatus according to the means (1) or (2), a second input waveguide connected to one input waveguide is provided in front of the pump input port of the wavelength demultiplexing means. Wherein the second wavelength demultiplexing means demultiplexes the wavelength multiplexed pump light propagating through the input waveguide to a pump light input port of the wavelength demultiplexing means. And This makes it possible to use a wavelength multiplexed light source as the pump light.

(4) In the multi-wavelength batch conversion device of the means (3), the second wavelength demultiplexing is performed by passing a part of the pump light through the wavelength conversion waveguide connected to the wavelength multiplexing means. Means for returning to the input waveguide of the vessel. This has the effect of eliminating the need for a pump light source.

[0021]

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 an overall schematic configuration of a multi-wavelength batch conversion apparatus according to Embodiment 1 of the present invention.

Here, unequally-spaced four wavelengths λ1 = 155
0 nm, λ2 = 1551 nm, λ3 = 1553 nm, λ
It is assumed that four wavelengths of 4 = 1556 nm are collectively wavelength-converted into four equally spaced wavelengths.

In FIG. 1, reference numeral 101 denotes an input port for inputting unequally-spaced wavelength division multiplexed signal lights λ1 to λ4;
Is a wavelength demultiplexer, 103 to 106 are waveguides, 107 is an input port for inputting pump light λa = 1557 nm,
108 is an input port for inputting pump light λb = 1558 nm, 109 is an input port for inputting pump light λc = 1559 nm, and 110 is pump light λd = 15
Input ports for inputting 60 nm, 111-114
Is a wavelength converter using mutual gain modulation, 115 is a multiplexer,
Reference numeral 116 denotes an output fiber.

FIG. 2 is a block diagram showing the detailed structure of the wavelength demultiplexer 102 in FIG.
Denotes a slab waveguide, and 119 denotes an array waveguide.

In FIG. 1 and FIG. 2, the unequally-spaced wavelength-division multiplexed signal light propagating in 101 is input to the slab waveguide 117 and distributed with the same light intensity as the array waveguide 119.
The unequally-spaced wavelength-division multiplexed signal light having a delay difference corresponding to the optical path length difference in the arrayed waveguide 119 is input to the slab waveguide 118 and converges.

At this time, the phase condition differs depending on the difference in wavelength, and λ1 is applied to the waveguide 103, λ2 is applied to the waveguide 104,
λ3 is output to the waveguide 105 and λ4 is output to the waveguide 106. On the other hand, the equally spaced pump lights λa to λd
Input from 07-110. Here, input port 107
When .about.110 are set at optimal positions with respect to the slab waveguide 117, .lamda.
Λc is output to the waveguide 105, and λd is output to the waveguide 106. That is, λ1 and λa are combined in the waveguide 103, λ2 and λb are combined in the waveguide 104, λ3 and λc are combined in the waveguide 105, and λ4 and λd are combined in the waveguide 106. Are input to the wavelength conversion elements 111 to 114. The wavelength conversion elements 111 to 114 convert the wavelengths of λ1 to λ4 into λa to λb, respectively. The wavelengths λa to λd are multiplexed using the multiplexer 115 and output to the output fiber 116, so that the non-equidistant wavelength multiplexed signals λ1 to λ4 are collectively wavelength-converted into the equidistant wavelength multiplexed signals λa to λd. can do.

FIG. 3 is a diagram showing characteristics of the wavelength conversion elements 111 to 114 of the mutual gain modulation type, wherein semiconductor optical amplifiers are used as the wavelength conversion elements 111 to 114.

A signal light (for example, λ1) and a pump light (for example, λa) are incident on the semiconductor optical amplifier. Here, if the intensity of the signal light is sufficiently strong (for example, 0 dBm or more), the gain of the semiconductor optical amplifier is saturated at a strong input intensity, and the amplification degree decreases as shown in FIG. That is, the gain of the pump light changes in accordance with the on / off of the input light. Utilizing this phenomenon, it is possible to perform wavelength conversion for converting only the wavelength λ1 of the signal light into the wavelength λa of the pump light without changing the signal information of the signal light.

Here, the batch conversion of wavelengths from unequal intervals to equal intervals has been described, but batch conversion of wavelengths from equal intervals to unequal intervals is also possible by the same means. Further, the mutual gain modulation type is described as the wavelength conversion element, but a four-wave mixing type or a mutual phase modulation type may be used.

When four-wave mixing is used, the signal light λ1, the pump light λa, and the converted light wavelength λα

[0032]

| Λ1−λa | = | λa−λα | There is a relationship of Expression 1, and the wavelengths of the pump light and the converted light are different.
Therefore, it is necessary to select pump light such that unequally-spaced signal light becomes equally-spaced converted light. For example, irregularly spaced λ
1 = 1550 nm, λ2 = 1551 nm, λ3 = 155
Four wavelengths of 3 nm and λ4 = 1556 nm are converted into equally-spaced light λ
α = 1557 nm, λβ = 1558 nm, λγ = 155
In order to convert to 9 nm and λδ = 1560 nm, λa = 1553.5 nm and λb = 1554.5 as pump light.
nm, λc = 1556 nm, λd = 1558 nm.

As described above, by using the characteristics of the wavelength conversion element in which the gain of the pump light varies in accordance with the on / off of the input light, the light-to-electric conversion and the electric-light conversion (that is, the conversion of the electric signal into an electric signal) are performed. It is possible to interconnect networks multiplexing multiple wavelengths without going through (without conversion).

(Embodiment 2) FIG. 4 is a block diagram showing an overall schematic configuration of a multi-wavelength batch conversion apparatus according to Embodiment 2 of the present invention.
An input port for inputting 1 to λ4, 202 is a wavelength demultiplexer, 203 to 206 are waveguides, and 207 is a pump light λa.
Input port for inputting pump light λb, input port 209 for inputting pump light λc, input port 210 for inputting pump light λd, and 211 for pump light An input port for inputting light λe, 212 is an input port for inputting pump light λf, 213 is an input port for inputting pump light λg, 214 is an input port for inputting pump light λh, 215 218, a wavelength converter using mutual gain modulation; 219, a multiplexer; 220, an output fiber;

Here, when the wavelength demultiplexer 202 is designed under optimal conditions, λ1, λa and λb are set in the waveguide 203, λ2, λc and λd are set in the waveguide 204, and λ1 is set in the waveguide 205.
3, λe and λf, and λ4, λg and λh
Are multiplexed, and each of the wavelength conversion elements 11
1 to 114 can be input.

That is, by turning on / off the pump light, the waveguide 203 can convert the wavelength of λ1 to either λa or λb, or both λa and λb simultaneously. The wavelengths λa to λg are multiplexed using the multiplexer 115 and output to the output fiber 116, whereby the wavelengths of the unequally-spaced wavelength multiplexed signals λ1 to λ4 can be collectively converted to λa to λg.

As described above, by turning on / off the pump light, the waveguide can convert the wavelength of one or both of a plurality of signal lights at the same time. Therefore, the number of wavelengths and the number of interconnections increase due to the increase in the scale of the network. Useful if you do.

Third Embodiment In the first and second embodiments, different input ports are used as pump light input ports. This is a convenient structure when each pump light is provided with a separate light source, but is inconvenient when the pump light is wavelength-multiplexed. Embodiment 3
The case where the pump light is wavelength-multiplexed will be described with reference to the drawings.

FIG. 5 is a block diagram showing an overall schematic configuration of a multi-wavelength batch conversion apparatus according to a third embodiment of the present invention. Reference numeral 301 denotes an input for inputting unequally-spaced wavelength multiplexed signal lights λ1 to λ4. Port 302, wavelength demultiplexer, 303-
306 is a waveguide, 307 is pump light λa = 1557 nm
308 is an input port for inputting the pump light λb =
An input port for inputting 1558 nm, 309 is an input port for inputting pump light λc = 1559 nm, 310 is an input port for inputting pump light λd = 1560 nm, and 311 to 314 are wavelengths using mutual gain modulation. A converter 315 is a multiplexer, 316 is an output fiber, and 317 is a wavelength multiplexed pump light λa ~.
This is a duplexer for splitting λd.

In the multi-wavelength batch conversion apparatus according to the third embodiment, as shown in FIG. 5, the wavelength-multiplexed pump light is split by the splitter 317 to the input ports 307 to 310.
Thereafter, as in the first embodiment, one wavelength of the signal light and one wavelength of the pump light are input to different wavelength converters, and only the wavelength of the signal light as it is is converted to the wavelength of the pump light. . The wavelength-converted signal light is multiplexed by the multiplexer 315 and output to the output fiber 316. That is, the wavelength conversion of the unequally-spaced wavelength multiplexed signals λ1 to λ4 into the equally-spaced wavelength multiplexed signals λa to λd can be performed at once.
This makes it possible to use a wavelength multiplexed light source as the pump light.

(Embodiment 4) In Embodiments 1 to 3,
A plurality of pump light sources or wavelength-multiplexed pump lights are required, which makes the whole system expensive. Thus, in the fourth embodiment, an inexpensive multi-wavelength batch conversion device that does not require a pump light source or wavelength-multiplexed pump light will be described with reference to the drawings.

FIG. 6 is a block diagram showing an overall schematic configuration of a multi-wavelength batch conversion apparatus according to a fourth embodiment of the present invention. Reference numeral 401 denotes an input for inputting unequally-spaced wavelength multiplexed signal lights λ1 to λ4. Port, 402 is a wavelength demultiplexer, 403 to
406 is a waveguide, 407 is pump light λa = 1557 nm
408 is an input port for inputting the pump light λb =
An input port for inputting 1558 nm, 409 is an input port for inputting pump light λc = 1559 nm, 410 is an input port for inputting pump light λd = 1560 nm, and 411 to 414 are wavelengths using mutual gain modulation. A converter 415 is a multiplexer, 416 is an output fiber, and 417 is a wavelength-multiplexed pump light λa ~.
a demultiplexer for demultiplexing λd; 418, an optical coupler;
9 denotes an optical fiber for feeding back a part of the pump light, and 420 denotes an isolator.

In the multi-wavelength batch conversion apparatus according to the fourth embodiment, as shown in FIG. 6, the wavelength division multiplexed pump light is split by the splitter 417 to the input ports 407 to 410.
After that, as in the first embodiment, one wavelength of the signal light and one wavelength of the pump light are respectively converted into different wavelength converters 411 to 414.
And only the wavelength of the signal light as it is is converted to the wavelength of the pump light. The wavelength-converted signal light is multiplexed by the multiplexer 415 and output to the output fiber 416.

Here, the feature of the fourth embodiment is that a part of the pump light is extracted at 418 and returned to the duplexer 417 in the clockwise direction. That is, for example, the pump light λa is 417 → 407 → 402 → 403
The laser beam circulates in a loop of → 411 → 415 → 418 → 419 → 420 → 417, and can generate pump light by oscillating laser light by itself.

Although a clockwise loop is assumed in the fourth embodiment, a counterclockwise loop may be used. In the case of counterclockwise rotation, the isolator 420 is installed with left and right inverted.

FIG. 7 is a block diagram showing another schematic configuration of the multi-wavelength batch conversion apparatus according to the fourth embodiment.
Reference numeral 21 denotes an input port for inputting unequally-spaced wavelength-division multiplexed signal lights λ1 to λ4, 422 denotes a wavelength demultiplexer, and 423 to 426.
Is a waveguide, 427 is an input port for inputting pump light λa = 1557 nm, and 428 is pump light λb = 155.
Input port 429 for inputting 8 nm, input port 429 for inputting pump light λc = 1559 nm, 43
0 is an input port for inputting the pump light λd = 1560 nm, 431 to 434 are four-wave mixing wavelength converters,
435, a multiplexer; 436, an output fiber;
7, a demultiplexer for demultiplexing the wavelength-multiplexed pump light λa to λd; 438, an optical fiber for feeding back part of the pump light; and 439, an isolator.

As shown in FIG. 7, in another multi-wavelength batch conversion device according to the fourth embodiment, a wavelength division multiplexed pump light is split by a splitter 437 to input ports 427 to 430. Thereafter, as in the first embodiment, one wavelength of the signal light and one wavelength of the pump light are respectively converted into different wavelength converters 43.
1 to 434, only the wavelength of the signal light as it is is converted to the wavelength of the pump light. The wavelength-converted signal light is multiplexed by the multiplexer 435 and output to the output fiber 436.

Here, in particular, when a four-wavelength wavelength converter is used as the wavelength conversion element, the wavelength of the pump light and the wavelength of the converted light are different. Therefore, by optimally designing the multiplexer 435, the converted light λα ~ Λδ to the output fiber 436,
The pump light λa to λd can be output to the optical fiber 438. Here, laser light is oscillated by feeding back only the pump light to the duplexer 437 to generate pump light.

In another configuration of the fourth embodiment,
A clockwise loop is assumed, but a counterclockwise loop may be used. In the case of counterclockwise rotation, the isolator 43
9 is set upside down.

As described above, the laser is oscillated by feeding back only the pump light to the demultiplexer, and the pump light is generated, so that the pump light source becomes unnecessary.

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.

[0052]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.

By using the characteristics of the wavelength conversion element in which the gain of the pump light varies depending on the on / off of the input light, a network in which multiple wavelengths are multiplexed without using optical-to-electrical conversion or electric-to-optical conversion. Can be interconnected between each other.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall schematic configuration of a multi-wavelength batch conversion apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed configuration of a wavelength demultiplexer in FIG.

FIG. 3 is a diagram showing characteristics of the mutual gain modulation type wavelength conversion element of the first embodiment.

FIG. 4 is a block diagram showing an overall schematic configuration of a multi-wavelength batch conversion apparatus according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing an overall schematic configuration of a multiple wavelength batch conversion device according to a third embodiment of the present invention.

FIG. 6 is a block diagram showing an overall schematic configuration of a multi-wavelength batch conversion apparatus according to a fourth embodiment of the present invention.

FIG. 7 is a block diagram showing another overall schematic configuration of the multi-wavelength batch conversion apparatus according to the fourth embodiment.

FIG. 8 is a block diagram showing a schematic configuration of an example of a conventional multi-wavelength conversion device.

FIG. 9 is a block diagram showing a schematic configuration of a conventional array waveguide grating for equal intervals.

FIG. 10 is a block diagram showing a schematic configuration of a conventional array waveguide grating for unequal intervals.

[Explanation of symbols]

101: input port for inputting unequally-spaced wavelength-division multiplexed signal lights λ1 to λ4, 102: wavelength demultiplexer, 103 to 10
6: waveguide, 107: input port for inputting pump light λa = 1557 nm, 108: pump light λb = 15
Input port for inputting 58 nm, 109... Input port for inputting pump light λc = 1559 nm, 1
10: Input ports for inputting pump light λd = 1560 nm, 111 to 114: wavelength converter, 115: multiplexer, 116: output fiber, 117, 118: slab waveguide, 119: array waveguide.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoko Sato 2-3-1 Otemachi, Chiyoda-ku, Tokyo Within Nippon Telegraph and Telephone Corporation (72) Inventor Katsuaki Song 2-3-3, Otemachi, Chiyoda-ku, Tokyo No. 1 Nippon Telegraph and Telephone Corporation F term (reference) 2K002 AA02 AB12 AB30 BA01 CA13 DA11 HA31 5K002 BA02 BA05 CA13 DA02

Claims (4)

[Claims] An unequally-spaced wavelength multiplexed signal light input port to which equally-spaced or unequally-spaced wavelength-multiplexed signal light is input,
A plurality of pump light input ports for inputting pump lights of a plurality of wavelengths different from the wavelength of the wavelength multiplexed signal light, and a signal light of one wavelength of the wavelength multiplexed signal light and the pump light corresponding thereto. A plurality of output ports for outputting,
Demultiplexing the wavelength-division multiplexed signal light into one-wavelength signal light,
Wavelength demultiplexing means for outputting together with the corresponding pump light, a plurality of wavelength converting means connected to the plurality of output ports, respectively, for converting the wavelength of the signal light of one wavelength of the output port by the pump light output together. A wavelength multiplexing unit comprising: a wavelength multiplexing unit that multiplexes each signal light converted by the plurality of wavelength conversion units and outputs the multiplexed signal light to a wavelength conversion output waveguide. A multi-wavelength batch conversion device, wherein a wavelength interval of light is different from a wavelength interval of the pump light. 2. The method according to claim 1, wherein the number of input ports for pump light of said wavelength demultiplexing means is larger than the number of output ports, and pump light of a plurality of different wavelengths is output to each output port of said wavelength demultiplexing means. The multi-wavelength batch conversion apparatus according to claim 1, wherein: 3. A second wavelength demultiplexer connected to one input waveguide is provided at a stage preceding the pump input port of the wavelength demultiplexer, wherein the second wavelength demultiplexer is provided. 3. The multi-wavelength batch conversion apparatus according to claim 1, wherein the wavelength division multiplexing pump light propagating through the input waveguide is demultiplexed to a pump light input port of the wavelength demultiplexing unit. 4. 4. A means for returning a part of the pump light to the input waveguide of the second wavelength demultiplexing means through the wavelength conversion waveguide connected to the wavelength multiplexing means. The multi-wavelength batch conversion apparatus according to claim 3, wherein: