JP4029515B2 - Wavelength converter and wavelength converter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical communication system, and more particularly to an apparatus constituting an optical wavelength division multiplexing transmission and an optical wavelength division multiplexing network.
[0002]
[Prior art]
When configuring an optical wavelength division multiplexing transmission or an optical wavelength division multiplexing network, the same optical wavelength cannot be used in one fiber. Therefore, in the future, if wavelength multiplexing technology advances and multiple wavelengths are used in one fiber, it is expected that it will be necessary to convert wavelengths between nodes, between repeaters, between terminals, etc. Is done. In a conventional optical communication system, when converting the wavelength of light, an optical signal transmitted at a wavelength before conversion is received by an optical receiver, the received signal is amplified by an amplifier, and is converted at another wavelength. Wavelength conversion of light has been performed by means of transmission using a transmitted optical transmitter. However, converting a wavelength by converting an optical signal into an electrical signal and converting it to an optical signal once again is costly to convert one wavelength. Therefore, a technique for converting the wavelength without increasing the cost of the device is required.
[0003]
For example, a technique disclosed by Jay. M. Wisenfeld et al. Is known as a technique for converting an optical wavelength. 18 is a rewrite of the block diagram shown in “WavelengthConversionat10Gb / susingaSemiconductorOpticalamplifier” in IEEEPhotonicsTechnologyLettersVol.5, No.11, pp.1300-1303, 1993.
In FIG. 18, 1 is an input terminal for inputting an optical signal, 2 is an optical multiplexer, 3 is a single mode oscillation laser light source, 4 is a semiconductor laser type optical amplifier, and 51 is a single wavelength transmission with respect to the optical wavelength axis. An optical filter 6 having a characteristic is a terminal for outputting an arbitrary wavelength.
The operation principle of converting the wavelength from λ1 to λ2 will be described with reference to FIGS.
The optical signal of λ1 whose optical intensity is modulated as shown in FIG. 18A is inputted from the terminal 1 for inputting the optical signal, and the non-modulation shown in FIG. 18B is given from the laser light source 3 of single mode oscillation. Λ2 optical signals are input, and both are combined by the multiplexer 2 and input to the semiconductor laser type optical amplifier 4 of FIG.
The optical signal input at the same time is modulated by a semiconductor laser type optical amplifier 4 on an unmodulated signal having an optical wavelength of λ2 according to the principle shown in FIG.
The semiconductor optical amplifier 4 has a saturation characteristic in which, when the input light intensity is in the gain saturation region, the gain decreases as the input light intensity increases as shown in FIG.
When the optical signal intensity of λ1 before wavelength conversion is in the gain saturation region of FIG. 19, the gain of the semiconductor laser type optical amplifier 4 is changed by the optical intensity modulation signal of λ1. That is, the gain is large when the light intensity modulation signal of λ1 is in the space state, and is small when the mark state is reached.
When an unmodulated λ2 optical signal is input simultaneously, the λ2 optical signal is also modulated by a change in the gain of the semiconductor laser optical amplifier 4.
However, the mark and space are reversed in the intensity modulation signal between the input intensity modulation signal before wavelength conversion and the output intensity modulation signal after wavelength conversion.
The output from the semiconductor laser type optical amplifier 4 in FIG. 18 is a signal of λ1 modulated as shown in FIG. 18C and a λ2 signal intensity-modulated by the semiconductor laser type optical amplifier 4 with a sign reversed from λ1. Output simultaneously.
Next, the optical signal of λ1 is removed by the optical filter 51 having the optical frequency transmission characteristic as shown in FIG. 18C, and the optical signal subjected to wavelength conversion of λ2 appears at the output of the wavelength converter. The wavelength conversion from λ1 to λ2 is performed through the above process.
[0004]
[Problems to be solved by the invention]
The conventional example discloses a technique for converting the wavelength of light as it is. However, as a problem, the wavelength signal input to the wavelength converter is also output at the same time, and it is necessary to remove the input wavelength at the output or select only the output after conversion by the optical filter.
If the input wavelength or output wavelength is determined, the wavelength selected by the optical filter may be fixed, but if the input wavelength or output wavelength is not determined, the optical filter The wavelength to be selected needs to be variable.
In the current technology, there is no practical optical filter that can change the selected wavelength instantaneously and stably. Therefore, it has been extremely difficult to output only the converted wavelength without outputting the wavelength of the input signal in the wavelength converter according to this method.
The present invention has been made to solve the above-described problems, and it is an object of the present invention to obtain a wavelength converter that does not output an input wavelength component from the wavelength converter.
[0005]
[Means for Solving the Problems]
This The wavelength converter according to the invention of An input terminal for inputting an optical signal, an optical demultiplexer for demultiplexing the optical signal from this input terminal into a plurality of optical signals, a plurality of single mode oscillation laser light sources, and a plurality of optical demultiplexers from the optical demultiplexer A plurality of optical multiplexers for combining optical signals and output light of the plurality of single-mode oscillation laser light sources, a plurality of semiconductor laser optical amplifiers for amplifying the plurality of combined lights, and the amplification An optical multiplexer that combines the plurality of optical signals, and a period with respect to a wavelength axis that transmits a plurality of wavelength components corresponding to output wavelengths of the plurality of single-mode oscillation laser light sources of the combined optical signals Optical filter with typical transmission characteristics and an output terminal that outputs an optical signal that has passed through this optical filter It is equipped with.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a wavelength converter according to this embodiment.
In FIG. 1, 1 is an input terminal for inputting an optical signal, 2 is an optical multiplexer, 3 is a laser light source of single mode oscillation, 4 is a semiconductor laser type optical amplifier, and 5 is periodically transmitted with respect to the optical wavelength axis. An optical filter 6 having characteristics is an output terminal for outputting an arbitrary wavelength.
As the single mode oscillation laser light source 3, a wavelength variable semiconductor laser light source, a wavelength variable ring laser light source, or the like can be used. As the filter 5, a fiber Fabry-Perot filter, a Mach-Zehnder filter, an array wave guide filter, or the like can be used.
[0019]
Next, the operation will be described with reference to FIGS.
FIG. 2 shows that one of the wavelengths λ1, λ3, and λ5 before conversion is converted into one of λ2, λ4, and λ6.
FIG. 2A shows an optical signal input to the input terminal 1 of FIG. The wavelength input at this time is any one of λ2n-1 (n: 1 to 1).
Since the wavelength converter in FIG. 1 has a function of converting only one optical signal, one of the wavelengths λ1, λ3, and λ5 is input from the input terminal 1 in FIG. This optical signal is subjected to light intensity modulation as shown in FIG.
The single mode oscillation laser light source 3 in FIG. 1 outputs the wavelength of the conversion destination. Any one of λ2, λ4, and λ6 as shown in FIG. 2C is output. The optical signal in this case is an unmodulated signal as shown in FIG.
After being multiplexed by the multiplexer 2, the gain of the semiconductor laser optical amplifier 4 is changed by the light intensity modulation of FIG. 2B, and the unmodulated signal of FIG. 2D is changed to the wavelength of FIG. As shown in the modulation signal after conversion, the modulation of the input modulation signal with respect to FIG.
FIG. 2E shows the output of the semiconductor laser optical amplifier 4 of FIG. 1, and shows that the optical signal before conversion and the optical signal after conversion are mixed. The transmission characteristic of the optical filter 5 in FIG. 1 following the output of the semiconductor laser type optical amplifier 4 in FIG. 1 transmits only the wavelength component after conversion of λ2n (n: 1 to 1) as shown in FIG. . The output of the optical filter 5 is as shown in FIG. 2G, and the optical waveform at that time is as shown in FIG. Therefore, the wavelength of FIG. 2A before entering the wavelength converter is converted to FIG. 2G.
In the case of this method, the input wavelength is any one of λ2n−1 (n: 1 to 1), and the output wavelength is any one of λ2n (n: 1 to 1).
[0020]
In the present invention, since the transmission wavelength of the output optical filter 5 is conventionally fixed, the wavelength after wavelength conversion is only λ2 as shown in FIG. 18 (d), but FIG. 2 (e). By using the optical filter 5 having the transmission characteristics as shown in FIG. 2, the output wavelength has a wavelength of λ2n (n: 1 to 1) as shown in FIG. 2 (g) without changing the transmitted wave of the optical filter. There is an advantage that one of them can be converted.
[0021]
Embodiment 2. FIG.
FIG. 3 is a block diagram showing the configuration of the wavelength converter according to this embodiment.
In FIG. 3, 1 is an input terminal for inputting an optical signal, 2a is a first optical multiplexer, 3a is a first single mode oscillation laser light source, 4a is a first semiconductor laser type optical amplifier, and 51a is an optical wavelength. A first optical filter having a transmission characteristic of a single wavelength with respect to the axis, 2b is a second optical multiplexer, 3b is a second single mode oscillation laser light source, and 4b is a second semiconductor laser type optical amplifier. , 51b is a second optical filter having a single wavelength transmission characteristic with respect to the optical wavelength axis, and 6 is an output terminal for outputting an arbitrary wavelength.
As the first single mode oscillation laser light source 3a and the second single mode oscillation laser light source 3b, a wavelength variable semiconductor laser light source, a wavelength variable ring laser light source, or the like can be used. A dielectric multilayer filter or the like can be used for the first optical filter 51a and the second optical filter 51b.
[0022]
Next, the operation will be described with reference to FIG. FIG. 4 shows how the wavelength is converted from λ1 to λ3.
An optical signal whose optical intensity is modulated in FIG. 4B having a wavelength of λ1 in FIG. 4A is input to the input terminal 1 in FIG. An unmodulated optical signal of λ2 is output from the first single-mode oscillation laser light source 3a of FIG. 3, and the output of the first semiconductor laser type optical amplifier 4a of FIG. 3 has the wavelength shown in FIG. A modulated signal as shown in FIG.
The subsequent first optical filter 51a in FIG. 3 has transmission characteristics as shown in FIG. 4C, so that the output of the first optical filter 51a in FIG. ). Further, the second single-mode oscillation laser light source 3b of FIG. 3 outputs another unmodulated signal of λ3, and the output of the second semiconductor laser type optical amplifier 4b of FIG. As shown in FIG. When this passes through the second optical filter 51b of FIG. 3 having the transmission characteristics as shown in FIG. 4 (g), only λ3 as shown in FIG. 4 (i) and FIG. Is output. Therefore, the same modulation signal as that input to the wavelength converter is output as the modulation signal.
[0023]
In the conventional system, the mark and space of the modulation signal after wavelength conversion are reversed in the conventional system, but after passing through the semiconductor laser type optical amplifier twice as in the second embodiment, the wavelength converted signal is converted. There is an advantage that the mark and space of the modulation signal can be made the same as before conversion.
[0024]
Embodiment 3 FIG.
FIG. 5 is a block diagram showing the configuration of the wavelength converter according to this embodiment.
In the figure, 5a is a first optical filter having a periodic transmission characteristic with respect to the optical wavelength axis, and 5b is a second optical filter having a periodic transmission characteristic with respect to the optical wavelength axis. The first optical filter 51a is replaced with the first optical filter 5a of FIG. 5, and the second optical filter 51b of FIG. 3 is replaced with the second optical filter 5b of FIG. Other configurations are the same as those in FIG.
[0025]
Next, the operation will be described with reference to FIGS. The basic operation is a combination of the first embodiment and the second embodiment. FIG. 6 shows that the wavelength is converted from the wavelength sequence λ2n−1 (n: 1 to 1) to the wavelength sequence λ2n−1 (n: 1 to 1). The optical signals in FIGS. 6A and 6B are input to the input terminal 1 in FIG. The outputs of the first optical filter 5a are as shown in FIGS. 6E and 6F, but when the wavelength is converted again, the outputs are as shown in FIGS. 6I and 6J, which are the same as the input modulation signal. It becomes a modulation signal, and the output wavelength is also output to the output terminal 6 in the same wavelength sequence as the wavelength input in the wavelength sequence λ2n−1 (n: 1 to 1). .
[0026]
In the present invention, the mark and space of the modulation signal after wavelength conversion are inverted in the conventional method, but the present invention has the advantage that the mark and space of the modulation signal after wavelength conversion can be the same as before conversion. Further, there is an advantage that the wavelength output from the wavelength converter is also the same wavelength string as the input.
[0027]
Embodiment 4 FIG.
FIG. 7 is a configuration block diagram showing the wavelength converter according to the present embodiment.
In the figure, 51 is a first optical filter having a transmission characteristic of a single wavelength with respect to the optical wavelength axis, and 52 is a second optical filter having a periodic transmission characteristic having bands for a plurality of channels with respect to the optical wavelength axis. This is an optical filter. Other configurations are the same as those in FIG.
[0028]
Next, the operation will be described with reference to FIGS. Optical signals as shown in FIGS. 8A and 8B are input to the input terminal 1 in FIG. At this time, the input wavelength is any one of λ1 to λ5. The output from the first single-mode oscillation laser light source 3a in FIG. 7 is only λ0, and the input signal is always converted to λ0. This is converted again to any one wave of λ1 to λ5 output from the second single mode oscillation laser light source 3b of FIG. For output, λ0 is removed by an optical filter having transmission characteristics as shown in FIG. Since the band of the output second optical filter is wide, the output outputs any one wavelength from λ1 to λ5 as shown in FIGS. 8I and 8J without changing the transmission wavelength of the filter.
[0029]
In the conventional method, the mark and space of the modulation signal after wavelength conversion are inverted, but in this invention, the mark and space of the modulation signal after wavelength conversion are also converted by passing through the semiconductor laser optical amplifier twice. There is an advantage that can be made the same as before. Further, there is an advantage that the wavelength input from the wavelength converter and the output wavelength can be freely set.
[0030]
Embodiment 5. FIG.
FIG. 9 is a block diagram showing the configuration of the wavelength converter according to this embodiment.
1 differs from FIG. 1 in that 8 includes an optical demultiplexer having one input terminal and n output terminals, and 9 includes an optical multiplexer having n input terminals and one output terminal. N single mode oscillation laser light sources, optical multiplexers, and semiconductor laser type optical amplifiers are arranged in parallel, and five optical filters are shared.
[0031]
The operation will be described with reference to FIG. The intensity-modulated optical signals input from the input terminal 1 are λ1 to λn and are output to the output ports 1 to n of the optical demultiplexer 8, respectively. The demultiplexed light intensity modulation signals modulate the gains of the semiconductor laser light source type optical amplifiers 4a to 4c, respectively, modulate the signals to the output wavelengths of the single mode oscillation laser light sources 3a to 3c, and combine them with the optical multiplexer 9. The component before being converted by the optical filter 5 from the input terminal 1 is removed by the optical filter 5 and output from the output terminal 6. Although the operation is basically the same as that of the first embodiment, it is possible to convert the wavelength of a plurality of wavelengths that are multiplexed on one input terminal and one output terminal.
[0032]
In the embodiments so far, only one wavelength is input to the input terminal 1 of the wavelength converter. However, in the present invention, a plurality of wavelengths are multiplexed on one input terminal of the wavelength converter, and the output is performed. When there is only one terminal 6, there is an advantage that a plurality of wavelengths can be converted simultaneously.
[0033]
Embodiment 6 FIG.
FIG. 10 is a block diagram showing the configuration of the wavelength converter according to this embodiment.
In the figure, 10 is an optical switch, 11a, 11b, and 11c are single mode oscillation wavelength fixed laser light sources, and the others are the same as those in FIG.
[0034]
The operation is almost the same as in the fifth embodiment. In each stage composed of n optical multiplexers 9 and n semiconductor laser optical amplifiers 4a to 4c, one unmodulated light having an optical wavelength after conversion is required. Accordingly, the output wavelengths of the single mode oscillation wavelength fixed laser light sources 3a to 3c are selected by the optical switch 10 and output.
[0035]
This embodiment has an advantage that a plurality of wavelengths can be converted when a plurality of wavelengths are multiplexed on one input terminal 1 and one output terminal 6 is provided. Further, by switching the single mode oscillation wavelength fixed laser light sources 11a to 11c with the optical switch 10, the single mode oscillation laser light sources 3a to 3c can be simplified.
[0036]
Embodiment 7 FIG.
FIG. 11 is a block diagram showing the configuration of the wavelength converter according to this embodiment.
The configuration of FIG. 11 is obtained by connecting the wavelength converter of FIG. 10 in series and applying the fifth embodiment to the third embodiment.
[0037]
In operation, the wavelength signal from the input terminal 1 is once converted into another wavelength and then converted again into the target wavelength. By performing wavelength conversion twice, the modulation signal becomes the same logical code as the input.
[0038]
In this embodiment, there is an advantage that a plurality of wavelengths can be converted when a plurality of wavelengths are multiplexed on one input terminal and there is also one output terminal. In addition, there is an advantage that the mark and space of the modulated signal after wavelength conversion can be made the same as before conversion by passing through the semiconductor laser type optical amplifier twice.
[0039]
Embodiment 8 FIG.
FIG. 12 is a block diagram showing the configuration of the wavelength converter according to the present embodiment.
The difference from FIG. 11 is that the sixth embodiment is applied to the third embodiment.
[0040]
In operation, the input wavelength signal is once converted to another wavelength and then converted again to the target wavelength. By performing wavelength conversion twice, the modulation signal has the same input mark and space.
[0041]
In this embodiment, there is an advantage that a plurality of wavelengths can be converted when a plurality of wavelengths are multiplexed on one input terminal and there is also one output terminal. By transmitting twice through the semiconductor laser type optical amplifier, there is an advantage that the mark and space of the modulated signal after wavelength conversion can be made the same as before conversion. There is an advantage of simplifying the laser light source by switching the single mode oscillation wavelength fixed laser light source with an optical switch.
[0042]
Embodiment 9 FIG.
FIG. 13 is a configuration block diagram showing the wavelength converter according to the present embodiment.
1a is an input terminal for inputting an optical signal, 12a is a first optical circulator, 4 is a semiconductor laser type optical amplifier, 12b is a second optical circulator, 6a is a first output terminal for outputting an arbitrary wavelength, Single mode oscillation laser light source 6b is a second output terminal for outputting an arbitrary wavelength.
[0043]
The operation will be described with reference to FIG. The modulated signal of λ1 in FIG. 13A passes through the circulator 12a, the semiconductor laser optical amplifier 4, and changes the gain of the semiconductor laser optical amplifier 4 according to the modulation signal. The second circulator 12b outputs an optical modulation signal before conversion to the output terminal 6a. The signal of λ2 to be converted is output from the single-mode laser light source 3, passes through the semiconductor laser type optical amplifier 4 by the second circulator 12b, is intensity-modulated, and the converted light λ2 is output to the second output terminal 6b. .
[0044]
In this embodiment, since an optical filter is not used to remove a signal before conversion, there is an advantage that there is no restriction on wavelength settings before and after conversion.
[0045]
Embodiment 10 FIG.
FIG. 14 is a block diagram showing the configuration of the wavelength converter according to the present embodiment.
1a is a first input terminal for inputting an optical signal, 12a is a first optical circulator, 4a is a first semiconductor laser type optical amplifier, 12b is a second optical circulator, and 6a is a first optical output of an arbitrary wavelength. , 3a is a first single mode oscillation laser light source, 6b is a second output terminal for outputting an arbitrary wavelength, 12c is a third optical circulator, 4b is a second semiconductor laser optical amplifier, 12d Is a fourth optical circulator, 3b is a second single mode oscillation laser light source, and 6c is a third output terminal for outputting an arbitrary wavelength.
[0046]
The operation will be described with reference to FIG.
The modulated λ1 signal of FIG. 14A passes through the first optical circulator 12a, passes through the first semiconductor laser optical amplifier 4a, and in accordance with the modulated signal of λ1, the first semiconductor laser optical amplifier 4a. Change the gain.
Further, the signal before wavelength conversion is output from the output terminal 6a by the second optical circulator 12b.
The signal of λ3 to be converted is output from the first single mode laser light source 3a.
[0047]
The signal of λ3 input to the semiconductor laser optical amplifier 4a by the second circulator 12b passes through the semiconductor laser optical amplifier 4a whose gain is modulated by the signal of λ1, and after the signal of λ3 is modulated , Passing through the first optical circulator 12a,
Through the third circulator 12c, the gain of the second semiconductor laser type optical amplifier 4b is changed according to the modulation signal of λ3.
The third circulator 12c outputs the converted light of the signal λ3 after wavelength conversion to the third output terminal 6c. The signal of λ2 converted for the second time is output from the second single-mode laser light source 3b, passes through the fourth circulator 12d, and passes through the second semiconductor laser optical amplifier 4b whose gain is modulated by λ3. Is output from the output terminal 6b after passing through the third circulator 12c.
[0048]
In this embodiment, since an optical filter is not used to remove the signal before conversion, there is an advantage that there is no restriction on the wavelength setting before and after conversion, and the mark of the modulation signal after wavelength conversion And space has the advantage of being the same as before conversion.
[0049]
Embodiment 11 FIG.
FIG. 15 is a block diagram illustrating the wavelength converter according to the present embodiment.
1 is an input terminal for inputting an optical signal, 13 is a polarization state converter, 14a is a first polarization splitter, 3 is a single mode laser light source, 4 is a semiconductor laser type optical amplifier, 14b is a second polarization splitter, 6a Is a first output terminal that outputs an arbitrary wavelength, and 6b is a second output terminal that outputs an arbitrary wavelength.
[0050]
The operation will be described with reference to FIG. The modulated λ1 signal in FIG. 15 (a) is assumed to be a TE wave, the polarization state converter 13 converts the polarization state into a TM wave, and is input to the first polarization beam splitter 14a. Are combined with the TE wave from the single mode laser light source 3. In the semiconductor laser type optical amplifier 4, the gain of the semiconductor laser type optical amplifier 4 is modulated by a λ1 TM wave with a light intensity modulation signal. The signal of the TE wave of λ2 is modulated by the gain modulation of the semiconductor laser light source 3, branched by the second polarization splitter 14b, and the signal before conversion is output from the first output terminal 6a that outputs an arbitrary wavelength for conversion. The later signal is output from the second output terminal 6b at an arbitrary wavelength. The signal at the input of the wavelength converter is deleted by polarization.
[0051]
In this embodiment, since an optical filter is not used to remove a signal before conversion, there is an advantage that there is no restriction on wavelength settings before and after conversion.
[0052]
Embodiment 12 FIG.
FIG. 16 is a block diagram showing the configuration of the wavelength converter according to this embodiment. The difference from the eleventh embodiment is that the wavelength converter of the eleventh embodiment is connected in series.
[0053]
In this embodiment, since an optical filter is not used to remove the signal before conversion, there is an advantage that there is no restriction on the wavelength setting before and after conversion, and the mark of the modulation signal after wavelength conversion and There is an advantage that the space can be the same as before conversion.
[0054]
Embodiment 13 FIG.
FIG. 17 is a block diagram showing the configuration of the wavelength converter according to this embodiment.
The difference from the first embodiment is that the fixed wavelength light sources 11a, 11b and 11c and the optical switch 10 of FIG. 17 are provided instead of the single mode oscillation laser light source 3 of FIG. The converted wavelength is selected from the n fixed wavelength light sources 11a, 11b, and 11c using the optical switch 10.
[0055]
In this embodiment, there is an advantage that the laser light source is simplified by switching the single-mode oscillation wavelength fixed laser light source with an optical switch.
[0056]
【The invention's effect】
This Since the wavelength converter according to the invention is configured as described above and includes an optical filter having periodic transmission characteristics, When multiple wavelengths are multiplexed, multiple wavelengths can be converted simultaneously .
[Brief description of the drawings]
FIG. 1 is a block diagram showing a basic configuration of a wavelength converter according to a first embodiment.
FIG. 2 is a diagram showing the operation of the wavelength converter according to the first embodiment.
FIG. 3 is a block diagram showing a basic configuration of a wavelength converter according to a second embodiment.
FIG. 4 is a diagram illustrating the operation of the wavelength converter according to the second embodiment.
FIG. 5 is a block diagram showing a basic configuration of a wavelength converter according to a third embodiment.
FIG. 6 is a diagram illustrating the operation of the wavelength converter according to the third embodiment.
FIG. 7 is a block diagram illustrating a basic configuration of a wavelength converter according to a fourth embodiment.
FIG. 8 is a diagram illustrating the operation of the wavelength converter according to the fourth embodiment.
FIG. 9 is a block diagram showing a basic configuration of a wavelength converter according to a fifth embodiment.
FIG. 10 is a block diagram showing a basic configuration of a wavelength converter according to a sixth embodiment.
FIG. 11 is a block diagram showing a basic configuration of a wavelength conversion device according to a seventh embodiment.
FIG. 12 is a block diagram showing a basic configuration of a wavelength conversion apparatus according to an eighth embodiment.
FIG. 13 is a block diagram illustrating a basic configuration of a wavelength converter according to a ninth embodiment.
FIG. 14 is a block diagram showing a basic configuration of a wavelength conversion device according to a tenth embodiment.
FIG. 15 is a block diagram showing a basic configuration of a wavelength converter according to an eleventh embodiment.
FIG. 16 is a block diagram showing a basic configuration of a wavelength conversion apparatus according to a twelfth embodiment.
FIG. 17 is a block diagram showing a basic configuration of a wavelength converter according to a thirteenth embodiment.
FIG. 18 is a diagram illustrating a first conventional example.
FIG. 19 is a diagram showing a second conventional example.
[Explanation of symbols]
1 Terminal for inputting optical signals
1a Terminal for inputting the first optical signal
1b Terminal for inputting the second optical signal
1c Terminal for inputting the second optical signal
2 multiplexer
2a First optical multiplexer
2b Second optical multiplexer
2c nth optical multiplexer
2d n + 1th optical multiplexer
2e n + 2th optical multiplexer
2f n + mth optical multiplexer
3 Single-mode oscillation laser light source
3a First single mode oscillation laser light source
3b Second single mode oscillation laser light source
3c nth single mode oscillation laser light source
3d n + 1th single mode oscillation laser light source
3e n + 2nd single mode oscillation laser light source
3f n + mth single mode oscillation laser light source
4. Semiconductor laser type optical amplifier
4a First semiconductor laser type optical amplifier
4b Second semiconductor laser type optical amplifier
4c nth semiconductor laser source optical amplifier
4d n + 1th semiconductor laser type optical amplifier
4e n + 2nd semiconductor laser type optical amplifier
4f n + mth Semiconductor Laser Type Optical Amplifier
5 Optical filter with periodic transmission characteristics with respect to the optical wavelength axis
5a A first optical filter having periodic transmission characteristics with respect to the optical wavelength axis
5b Second optical filter having periodic transmission characteristics with respect to the optical wavelength axis
51 Optical filter having transmission characteristics of a single wavelength with respect to the optical wavelength axis
51a A first optical filter having a single wavelength transmission characteristic with respect to the optical wavelength axis
51b Second optical filter having transmission characteristics of a single wavelength with respect to the optical wavelength axis
52 An optical filter having transmission characteristics having a plurality of channels for a channel of an optical wavelength axis
6 Output terminal that can output any wavelength
6a Output terminal for outputting first arbitrary wavelength
6b Output terminal for outputting the second arbitrary wavelength
6c Output terminal for outputting second arbitrary wavelength
7 Optical demultiplexer
7a First optical demultiplexer
7b Second optical demultiplexer
8 optical demultiplexer having n output terminals
8a First optical demultiplexer having n output terminals
8b Second optical demultiplexer having n output terminals
9 Optical multiplexer having n input terminals
9a Optical multiplexer having n input terminals
9b Optical multiplexer having n input terminals
10 Optical switch
10a First optical switch
10b Second optical switch
11a First single mode oscillation laser light source with fixed oscillation wavelength
11b Second single mode oscillation laser light source with fixed oscillation wavelength
11c nth single mode oscillation laser light source with fixed oscillation wavelength
11d The (n + 1) th single-mode oscillation laser light source whose oscillation wavelength is fixed
11e n + 2 single mode oscillation laser light source with fixed oscillation wavelength
11f n + m single mode oscillation laser light source with fixed oscillation wavelength
12a First optical circulator
12b Second optical circulator
12c Third optical circulator
12d Fourth optical circulator
13 Polarization state converter
13a First polarization state converter
13b Second polarization state converter
14a First polarization splitter
14b Second polarization splitter
14c Third polarization splitter
14d Fourth polarization splitter

Claims (4)

An input terminal for inputting an optical signal, an optical demultiplexer for demultiplexing the optical signal into a plurality of optical signals from the input terminals, a plurality of single-mode oscillation laser light source, a plurality of the said optical demultiplexer a plurality of optical multiplexer for multiplexing optical signals and an output light of said plurality of single-mode oscillation laser light source, respectively, and a plurality of semiconductor laser optical amplifier for amplifying the multiplexed plurality of light respectively, the An optical multiplexer that combines a plurality of amplified optical signals, and a wavelength axis that transmits a plurality of wavelength components corresponding to output wavelengths of the plurality of single-mode oscillation laser light sources of the combined optical signals. A wavelength converter comprising: an optical filter having a periodic transmission characteristic; and an output terminal for outputting an optical signal transmitted through the optical filter. Wavelength converter according to claim 1, characterized in Rukoto to have a light switch for connecting said plurality of single-mode onset touch over The light source and the plurality of optical multiplexer and respectively selected and. A wavelength converter according to claim 1 , wherein the first wavelength converter and the second wavelength converter are connected in series. A wavelength converter according to claim 2 , wherein the first wavelength converter and the second wavelength converter are connected in series.

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