JPH04127593A - Wavelength synchronous type optical wavelength conversion device - Google Patents

Abstract

PURPOSE:To subject optical signals to a wavelength conversion process through the injection synchronous operation of a wavelength conversion semiconductor laser so as to be outputted stably in wavelength without converting them into electrical signals by a method wherein signal light is inputted into a wavelength conversion semiconductor laser through a signal light input section located at one end face of the laser and a reference wavelength light is inputted through a reference wavelength light input section located at the same end face. CONSTITUTION:When signal light is inputted into a wavelength conversion semiconductor laser 1, the laser 1 converts the inputted signal light into the signal light different in wavelength and output it, and a reference wavelength light generator 3 generates a reference wavelength light stable in wavelength. The light outputted from the laser 1 as converted is set nearly equal to the reference wavelength light in wavelength through the laser 1, and signal light is inputted into the wavelength conversion semiconductor laser 1 through a signal light input section 2 located at one end face of the laser 1 and a reference wavelength light is inputted through a reference wavelength light input section 4 located at the same end face. By this setup, through the injection synchronous operation of the wavelength conversion semiconductor laser 1, output light which is synchronous with the reference wavelength light and stable in wavelength and hardly fluctuates in wavelength can be obtained from a signal light output section 5 located at the end face of the laser 1.

Description

[Detailed Description of the Invention] [Summary] Regarding a wavelength-synchronized optical wavelength conversion device, this wavelength-synchronized optical wavelength conversion device performs wavelength conversion processing without converting an optical signal into an electrical signal and outputs it as a stable wavelength. A wavelength conversion semiconductor laser that converts an input signal light into light of a different wavelength different from the signal light and outputs the same, and a standard that generates a reference wavelength light of a stable wavelength. The wavelength light generating section makes the wavelength of the output light converted and outputted by the wavelength conversion semiconductor laser almost the same wavelength as this reference wavelength light, and also includes a signal light input section on one end face of the wavelength conversion semiconductor laser. By inputting the signal light from the input section and the reference wavelength light from the reference wavelength light input section on the same end face, the injection locking operation of this wavelength conversion semiconductor laser allows stable wavelength light with little wavelength fluctuation to be synchronized with the reference wavelength light. It is constructed by obtaining output light from the signal light output section on the other end face.

[Industrial application field]

The present invention relates to a wavelength-synchronized optical wavelength conversion device, and more particularly, to an optical wavelength conversion device for converting the wavelength of an optical signal of a specific wavelength among a plurality of optical signals each having a different wavelength that is multiplexed on a wavelength axis. The present invention relates to a wavelength-synchronized optical wavelength conversion device in which a conversion element outputs an output light wavelength in synchronization with a predetermined stable reference light wavelength.

BACKGROUND OF THE INVENTION With the development of optical communication network technology, various studies are being conducted on optical signal exchange systems such as optical switching and optical subscriber systems.

Among them, one of the features of optical fiber transmission system, broadband property, that is, the ability to handle optical signals of multiple frequencies or multiple wavelengths at the same time, can be utilized for example to connect and exchange subscribers and terminals. A wavelength multiplexing type optical communication system has been proposed, which allocates optical wavelengths according to the destination, converts the wavelength of the optical signal according to the destination, and transmits the signal.

In such an optical wavelength division multiplexing communication system, an optical wavelength conversion element is used as an optical wavelength conversion device having characteristics that allow the wavelength of an optical signal to be freely converted, and an optical wavelength conversion device using such an optical wavelength conversion element is used. For this reason, optical wavelength conversion elements that convert the wavelength of an input optical signal and output it by applying semiconductor laser technology have been proposed and researched.

When applying such optical wavelength conversion processing to wavelength-multiplexed optical signals, it is necessary to convert a specific wavelength of multiple optical signals that are multiplexed on the wavelength axis and have wavelengths close to each other. In order to perform optical wavelength conversion only on optical signals of It is required that you do so.

[Conventional technology]

FIG. 11 shows a conventional optical wavelength conversion device.

In FIG. 11, 31 is an optical/electrical conversion circuit, and a wavelength λ inputted from the signal light input section 33.

converts the optical signal into an electrical signal and outputs it. Reference numeral 32 denotes an electrical/optical conversion circuit, which converts the converted electrical signal into a wavelength λ when inputted through the electrical signal input section 34.
, and output from the signal light output section 35 as an optical signal having another wavelength λ different from .

In this way, the optical wavelength conversion function can be realized through the mutual conversion function between optical signals and electrical signals.

Furthermore, with the recent development of semiconductor laser technology, optical wavelength conversion elements that can output light of a wavelength different from the wavelength of input light by controlling current have been proposed and researched.

FIGS. 12(a) to 12(C) show another conventional optical wavelength conversion device, and a method of converting the optical wavelength using such an optical wavelength conversion element will be described below.

In FIG. 12(a), 401 is an optical wavelength conversion element, and when light of a certain wavelength λ, 7 is input, it responds to the signal and converts a wavelength λ different from λ, 7. It outputs ut light. A wavelength conversion semiconductor laser 402 shown in FIG. 12 is an example of such an optical wavelength conversion element realized using semiconductor laser technology.

In FIG. 12(b), the wavelength conversion semiconductor laser 402
has an active layer 406 consisting of two gain regions 403 and 404 and a saturable absorption region 405, and a phase shift region 40.
7 and D B RSff area 409.
410. The DBR region 409 has a diffraction grating 408 in the light guide layer. The phase shift region 407 and the D B RSJi region 409 are wavelength control I
'pM region 411 is formed.

Here, the active layer 406 is a part that generates optical energy using electrical energy, and the current injection region below the two electrodes becomes a gain region, and the part in the middle where there is no electrode becomes a saturable absorption region. light guide layer 410
is a part that guides the light generated in the active layer 406 and forms a phase shift region 407 that shifts the phase of the generated light.
08 is provided to form a D B Rw4 region 409 that causes resonance due to the interaction between the optical energy transmitted from the phase shift region 407 and the diffraction grating 408 .

Since this wavelength conversion semiconductor laser 402 has a gain region and a saturable absorption region, the optical input/output characteristics are as follows.
In general, it exhibits a value characteristic as shown in FIG. 12(C).

Figure 12 (C) shows the optical input/output characteristics of the wavelength conversion semiconductor laser. When the input level of light with wavelength λ1 exceeds a certain value P (λin), the light becomes extremely intense. A wavelength λ where the output is large and the output wavelength is different from λ1.1. It is □.

Therefore, by using such an optical wavelength conversion element using a wavelength conversion semiconductor laser, it is possible to realize an optical wavelength conversion device that converts an input optical wavelength to another desired wavelength and outputs the same.

[Problem to be solved by the invention]

In the conventional optical wavelength conversion device shown in FIG. 11, an optical/electrical conversion circuit and an electrical/optical conversion circuit are always required in the wavelength conversion operation of signal light.

Therefore, for example, by converting the wavelength of light of a specific wavelength among a large number of optical signals of different wavelengths that are multiplexed on the wavelength axis and outputting it to another optical transmission path, it is possible to When configuring an optical wavelength division multiplexing transmission network/connection network that interconnects optical transmission lines or optical lines, a large number of optical/electrical conversion circuits and electrical/electrical conversion circuits are required to handle a large number of wavelengths.
An optical conversion circuit must be provided, resulting in problems such as an increase in the scale and complexity of the signal processing section.

Furthermore, in the conventional optical wavelength conversion device shown in FIGS. 12(a) to (C), there is no need to once convert the signal light into an electrical signal in the wavelength conversion operation of the signal light, and therefore optical/electrical conversion is possible. No circuitry or electrical/optical conversion circuitry is required. However, since an optical wavelength conversion element such as a wavelength conversion semiconductor laser is used, the wavelength of the output light is changed, for example, as shown in FIG. 12(b).
Gain region 40 of wavelength conversion semiconductor laser 402 shown in
3 and 404, and the current flowing through the wavelength control region 411. Therefore, due to current fluctuations and temperature fluctuations,
The output light wavelength may be affected and fluctuate.

In these cases, if the mutual spacing between the multiplexed wavelengths is narrow, fluctuations in the wavelength of the light output due to the wavelength conversion operation may cause crosstalk (interference) and mutual interference between the multiple channels. There is a problem in that this causes error-free and normal information communication.

The present invention aims to solve the problems of the prior art, and is to perform wavelength conversion processing without converting an optical signal into an electrical signal, and to change the wavelength of light output as a result of the wavelength conversion operation. An object of the present invention is to provide a wavelength-synchronized optical wavelength conversion device that can output a stable wavelength without fluctuation.

[Means to solve the problem]

FIGS. 1 to 4 each show the basic structure of the present invention.

As shown in FIG. 1, the present invention uses a wavelength conversion semiconductor laser 1 to convert input signal light into light having a different wavelength different from the wavelength of the signal light, and outputs the light at a reference wavelength light generator. 3, a reference wavelength light having a stable wavelength is generated.

Then, the wavelength of the output light converted and outputted by the wavelength conversion semiconductor laser 1 is set to be approximately the same wavelength as the reference wavelength light, and a signal light is inputted from the signal light input section 2 on one end face of the wavelength conversion semiconductor laser 1. However, by inputting the reference wavelength light from the reference wavelength light input section 4 on the same end face, the injection locking operation of the wavelength conversion semiconductor laser 1 allows the output light of a stable wavelength with less wavelength fluctuation to be synchronized with the reference wavelength light to the other side. The signal light is obtained from the signal light output section 5 on the end face.

Further, as shown in FIG. 2, the present invention provides a wavelength converting semiconductor laser 1 which converts input signal light into light having a different wavelength different from the wavelength of the signal light and outputs the light, thereby generating reference wavelength light. The section 3 generates a stable reference wavelength light, and the optical coupler 6 combines the signal light input from the signal light input section 2 and the reference wavelength light input from the reference wavelength light input section 4.

Then, the wavelength of the output light converted and outputted by the wavelength conversion semiconductor laser 1 is set to approximately the same wavelength as the reference wavelength light, and the combined light of the optical coupler 6 is inputted to one end face of the wavelength conversion semiconductor laser 1. By doing so, by the injection locking operation of the wavelength conversion semiconductor laser 1, output light of a stable wavelength with little wavelength fluctuation, which is synchronized with the reference wavelength light, can be obtained from the signal light output section 5 on the other end face.

Furthermore, as shown in FIG. 3, when a signal light is inputted to the wavelength converting semiconductor laser 1, the present invention converts it into light of another wavelength different from the wavelength of the signal light and outputs it, thereby generating a reference wavelength light. The reference wavelength light with a stable wavelength is generated by the section 3, and the signal light input section 2 is generated by the polarization beam splinterf.
Signal light input as TM polarized light and reference wavelength light input section 4
The reference wavelength light input as TE polarized light is combined with the reference wavelength light input from the TE polarized light.

Then, the wavelength of the output light converted and outputted by the semiconductor laser 1 is set to approximately the same wavelength as the reference wavelength light, and the combined light of the polarizing beam splitter 7 is input to one end face of the wavelength conversion semiconductor laser 1. As a result, by the injection locking operation of the wavelength conversion semiconductor laser 1, output light of a stable wavelength with little wavelength fluctuation, which is synchronized with the reference wavelength light, can be obtained from the signal light output section 5 on the other end face.

Furthermore, as shown in FIG. 4, when a signal light is inputted to the wavelength conversion semiconductor laser 1, the present invention converts it into light of another wavelength different from the wavelength of the signal light and outputs it, thereby generating light of a reference wavelength. The reference wavelength light having a stable wavelength is generated by the section 3, and the signal light input section 2 is generated by the polarization beam splitter.
The signal light input from the wavelength converting semiconductor laser 1 is input as 7M polarized light into one end face of the wavelength converting semiconductor laser 1, and the output light of the wavelength converting semiconductor laser 1 from this end face is outputted from the signal light output unit 5 as TE polarized light.

Then, the wavelength of the output light converted and outputted by the wavelength conversion semiconductor laser 1 is set to approximately the same wavelength as the reference wavelength light, and the reference wavelength light input section 4 on the other end surface of the wavelength conversion semiconductor laser 1 is connected to the reference wavelength light. By inputting the wavelength light, the injection locking operation of the wavelength conversion semiconductor laser 1 causes the signal light output section 5 to obtain output light of a stable wavelength that is synchronized with the reference wavelength light and has little wavelength fluctuation.

[Effect]

FIG. 1 shows the first principle configuration of the present invention.

In FIG. 1, 1 is a wavelength conversion semiconductor laser,
For example, it is an optical wavelength conversion element based on a semiconductor laser, such as a wavelength conversion semiconductor laser 402 having the configuration shown in FIG. 12(G). Reference numeral 2 denotes a signal light input section, which inputs a signal light having a wavelength λ whose wavelength is to be converted in the wavelength conversion semiconductor laser 1 into the wavelength conversion semiconductor laser 1 .

Reference numeral 3 denotes a reference wavelength light generating section, which outputs stable reference wavelength light with sufficiently small wavelength fluctuations. Reference numeral 4 denotes a reference wavelength light input section, which inputs the reference wavelength light outputted from the reference wavelength light generation section 3 into the wavelength conversion semiconductor laser 1 .

Reference numeral 5 denotes a signal light output section, which outputs the signal light whose wavelength has been converted in the wavelength conversion semiconductor laser 1.

Now, as shown in FIG. 1, a signal light having a wavelength λ is input from the signal light input section 2 to the wavelength converting semiconductor laser 1, and the wavelength is converted to another wavelength λ different from λ. shall be taken as a thing. The wavelength conversion semiconductor laser 1 has its driving current set so as to oscillate at a wavelength λ in response to optical input, and in response to a signal having a wavelength λ from the signal light input section 2, converts light having a wavelength λj. A signal is output, but at this time, the output wavelength of the wavelength conversion semiconductor laser 1 may fluctuate within a finite range around the wavelength λ due to fluctuations in the driving current of the wavelength conversion semiconductor laser 1 or fluctuations in the surrounding temperature. It is qualitative.

Now, a stable wavelength λ with sufficiently small fluctuation is output from the reference wavelength light generator 3 through the reference wavelength light input part 4 to the wavelength conversion semiconductor laser 1 which is oscillating at the wavelength λ5 or a wavelength in the vicinity thereof. When light is input, an injection locking operation of the semiconductor laser occurs, and the oscillation wavelength of the wavelength conversion semiconductor laser 1 is synchronized with the wavelength of the reference wavelength light and locked to the wavelength λ4. The wavelength λ from this reference wavelength light generator,
Since the wavelength of the light is stable, the oscillation wavelength of the wavelength conversion semiconductor laser 1 that is synchronized with it is also a stable wavelength that has the same or almost the same stability as the reference wavelength and has sufficiently small fluctuations. Become.

FIGS. 2 to 4 show the second to fourth principle configurations of the present invention, and each shows possible methods of merging the signal light and the reference wavelength light. In the figure, the same parts as in FIG. 1 are designated by the same numbers.

6 is an optical coupler, which has two input terminals and one output terminal, and which connects the signal light input from the signal light input section 2;
It combines the reference wavelength light input from the reference wavelength light input section 4, outputs it, and inputs it to the wavelength conversion semiconductor laser. 7 is a polarizing beam splitter, which has a total of three optical input/output terminals, functions as a polarization-maintaining optical coupler, and outputs the light input from each terminal in the corresponding direction according to the input polarization. It is something to do.

In the basic configuration shown in FIG. 2, a signal light and a reference wavelength light are inputted from each of the two input terminals of the optical coupler 6, combined, and then inputted to the wavelength conversion semiconductor laser 1. ing.

In this case, since the oscillation light of the semiconductor laser is TE polarized light, the injection locking operation can be caused more effectively and stably if the input reference wavelength light is also inputted as TE polarized light. Therefore, by using the optical coupler 6 as a polarization-maintaining optical coupler and inputting the reference wavelength light as TE polarized light to the wavelength conversion semiconductor laser, the wavelength can be stabilized more effectively.

In the principle configuration shown in FIG. 3, a polarization beam submerger 7 is used as a means for combining signal light and reference wavelength light, and the signal light with wavelength λ is converted into TM polarized light and the signal light with wavelength λ is used as TM polarized light. The reference wavelength light is input as TE polarized light.

In the principle configuration shown in FIG. 4, the oscillation light of the wavelength conversion semiconductor laser 1 is TE-polarized light with respect to the active layer, so that the wavelength The output light, which is the oscillation light of the conversion semiconductor laser 1, is made to pass through the polarization beam splitter 7 and be output. At the same time, signal light is input from the other terminal of the polarization beam splitter, and reference wavelength light of arbitrary polarization is input from the other end face of the wavelength conversion semiconductor laser 1 to cause injection locking operation. I have to.

〔Example〕

FIGS. 5 to 10 each show the configuration of an embodiment of the present invention, and illustrate a case where a multi-channel optical wavelength conversion switch is configured.

In the embodiment shown in FIG. 5, 1-1, . λ.

It outputs 1 light.

Reference numeral 50 denotes a reference wavelength light group generating section, which generates light having stable reference wavelengths equal to the number of multiplexed wavelengths. This can be regarded as a collection of the reference wavelength light generating sections 3 in the basic configuration of FIG. 1 for the number of wavelengths multiplexed. Such a reference wavelength light group generator can be realized by using an optical resonator and coupling the wavelengths of a plurality of semiconductor lasers to the resonant frequency of the resonator.

Reference numeral 51 denotes an IXn star coupler for signal light, which distributes a plurality of signal lights of different wavelengths multiplexed on the wavelength axis into n optical paths. 52-1. ..., 52-
n is a variable wavelength selection filter that selectively extracts only the optical signal of the desired wavelength whose wavelength is to be converted from among the wavelength multiplexed optical signals distributed into n wavelengths by the signal light IXn optical star coupler 51; It is.

Reference numeral 53 denotes an IXn star coupler for reference wavelength light, which distributes n stabilized reference wavelength lights outputted from the reference wavelength light group generating section 50 to n optical paths. 5
4-1. ... 54-0 is a fixed wavelength selection filter, which selects a reference wavelength light having a predetermined wavelength set in advance from among the n reference wavelength lights distributed by the reference wavelength light IXn star coupler 53. It is something to be taken out.

55-1. . . , 55-n are 2×1 optical couplers, and variable wavelength selection filters 52-1 . ..., 52
−n, and the fixed wavelength selection filter 51-1. . . . , the reference wavelength light having the wavelength selected by 54-n is combined in correspondence with the respective output ports of the 1×n optical star coupler 51 for signal light and the IXn star coupler 53 for reference wavelength light. , wavelength conversion semiconductor lasers 1-1, . . . , 1-n. 56 is n×
1-light star coupler, which is a wavelength conversion semiconductor laser l-
1, . . . , 1-n are combined into one optical signal path.

Now, in order to distinguish between the signal light and the reference wavelength light, the wavelength of the signal light is expressed as λ1°, . . . , λ7, and the wavelength of the reference wavelength light is expressed as λ1.

Wavelength λ1. ..., the reference wavelength lights having λ7 are transmitted through the corresponding fixed wavelength selection filters 54-1..., 54, respectively.
-n, and the 2×1 optical couplers 55-1. ..., 5
5-n, the wavelength conversion semiconductor laser 1-1. ..., 1
-N is always input. Therefore, the wavelength conversion semiconductor laser 1-1. . . , 1-n, the wavelength of the light outputted from the fixed wavelength selection filter 54-1 . ..., 54-
n, and the 2×1 optical couplers 55-1. ...,
55-n, the wavelength conversion semiconductor laser 1-1.・・１−
The reference wavelength light input to n, wavelengths λ1, ..., λ
It is uniquely determined to be any one wavelength among 0.

On the other hand, for signal light, the wavelength λ1.・
..., to convert to one wavelength among λ□,
The wavelength λ,゛,..., corresponds to the output wavelength.
λ7'', variable wavelength selection filter 52-1.
..., select with 52-n, 2×1 optical coupler 55-1
．． ..., wavelength conversion semiconductor laser 1 via 55-n
-1, .

As a result, n signal lights having wavelengths λ, , . ...λ. Since the converted wavelength is stabilized into light with a less fluctuation wavelength by injection locking operation, the desired wavelength conversion switch operation can be realized.

In the above-described embodiment, the signal light and the reference wavelength light are converted into wavelength conversion semiconductor lasers 1-1. . . , 1-0, 2×1 optical couplers 55-1, . . . , 55-n are used. As shown in FIG. May be used. Moreover, each of the wavelength conversion semiconductor lasers 1-1. ..., 1-n output lights are configured to all merge at the nX1 optical star coupler 56, but instead of merging, each of the n output lights follows a separate path. , may be output to separate optical transmission paths.

In the embodiment shown in FIG. 6, in order to distribute the signal light and reference wavelength light to n wavelength conversion semiconductor lasers, IXn
Instead of using an optical star coupler and n wavelength filters, a 1×2 optical coupler for signal light 61-1. ...,
61-n and a 1×2 optical coupler 63-1 for reference wavelength light.
-, 63-n are connected in series, and one of the outputs of each is connected to a variable wavelength selection filter 51-1 .
. . 52-n and fixed wavelength selection filters 54-1° . . . , shows a configuration in which they merge at 55n.

In this case, wavelength conversion semiconductor laser 1-1. ...1-n
The method of combining the output lights of 2x1 optical couplers 66-1°..., 66-(n
-1) may be used. Furthermore, the variable wavelength selection filters 52-1°, . 1
. . , 1-n may be fixed, and the reference light wavelength and the converted light output wavelength may be variable.

In the embodiment of FIG. 7, the signal light IXn optical star coupler 51 and the variable wavelength selection filter 52-1. ..., 52-n is replaced with a variable optical demultiplexer 71, and the other parts are the same as in the case of FIG. This example has the advantage that the configuration is simpler than the case shown in FIG.

In the embodiment shown in FIG. 8, the IXn star coupler 53 for reference wavelength light and the fixed wavelength selection filters 54-1, . . . , 54n in the embodiment shown in FIG. 5 are replaced with an IXn fixed optical demultiplexer 81. The other parts are the same as those shown in FIG. 5. This example has the advantage that the configuration is simpler than the case shown in FIG.

In the embodiment of FIG. 9, the 1×2 optical coupler 611 for signal light in the embodiment of FIG. . . 61-n and the variable wavelength selection filters 52-1° . . . , 91-n is shown, and the other parts are the same as in the case of FIG. 6. This example has the advantage that the configuration is simpler than the case shown in FIG.

In the embodiment of FIG. 10, the 1×2 optical couplers 63-1° . . . , 63- for the reference wavelength light in the embodiment of FIG.
n and fixed wavelength selection filter 54-1. ..., 54
-n to the fixed 1×2 optical demultiplexer 92-1. ...,
92-n, and the other parts are the 6th
This is the same as the case shown in the figure. This example has the advantage that the configuration is simpler than the case shown in FIG.

〔Effect of the invention〕

As explained above, according to the present invention, wavelength conversion processing is performed without converting an optical signal into an electrical signal from among a plurality of signal lights of different wavelengths multiplexed on the wavelength axis, and
It becomes possible to suppress fluctuations in the wavelength of light outputted by the wavelength conversion operation to the extent of fluctuations in the wavelength of light used as a reference wavelength.

Therefore, it is possible to realize a wavelength conversion device that outputs the wavelength of light output as a result of wavelength conversion operation as a stable wavelength without fluctuation, which greatly contributes to the realization of an optical wavelength division multiplexing transmission network that utilizes the multiplicity of wavelengths.

[Brief explanation of drawings]

Figures 1 to 4 are diagrams showing the basic configuration of the present invention, Figures 5 to 10 are diagrams each showing the configuration of an embodiment of the present invention, and Figure 11 is a conventional optical wavelength conversion device. A diagram showing
FIGS. 12(a) to 12(C) are diagrams showing other conventional optical wavelength conversion devices. 1 is a wavelength conversion semiconductor laser, 2 is a signal light input section, 3 is a reference wavelength light generation section, 4 is a reference wavelength light input section, 5 is a signal light output section, 6 is an optical coupler, and 7 is a polarization beam splitter.

Claims (4)

[Claims] (1) A wavelength conversion semiconductor laser (1) that converts a signal light input into light of a wavelength different from the wavelength of the signal light and outputs it, and a reference wavelength light that generates a reference wavelength light of a stable wavelength. Generating part (
3), the wavelength of the output light converted and outputted by the wavelength conversion semiconductor laser (1) is set to approximately the same wavelength as the reference wavelength light, and one end face of the wavelength conversion semiconductor laser (1) is provided. By inputting the signal light from the signal light input section (2) of the laser beam and the reference wavelength light from the reference wavelength light input section (4) of the same end face, the injection locking operation of the wavelength conversion semiconductor laser (1) converts the reference wavelength. A signal light output section (5) on the other end face outputs light of a stable wavelength with little wavelength fluctuation in synchronization with the wavelength light.
A wavelength synchronized optical wavelength conversion device characterized in that it is obtained from. (2) A wavelength conversion semiconductor laser (1) that converts signal light into light of a different wavelength when inputted and outputs the signal light, and a reference wavelength light that generates a reference wavelength light of a stable wavelength. Generating part (
3), and an optical coupler (6) that combines the signal light input from the signal light input section (2) and the reference wavelength light input from the reference wavelength light input section (4), The wavelength of the output light converted and outputted by the conversion semiconductor laser (1) is set to approximately the same wavelength as the reference wavelength light, and the optical coupler (6) is connected to one end face of the wavelength conversion semiconductor laser (1). ), the injection-locked operation of the wavelength conversion semiconductor laser (1) outputs output light of a stable wavelength with little wavelength fluctuation, which is synchronized with the reference wavelength light, to the signal light output section ( 5) A wavelength synchronized optical wavelength conversion device characterized by being obtained from. (3) A wavelength converting semiconductor laser (1) that converts signal light into light of a different wavelength different from the wavelength of the signal light and outputs it when input signal light; and a reference wavelength light that generates a reference wavelength light of a stable wavelength. Generating part (
3), and a polarizing beam splitter (7) that combines the signal light inputted as TM polarized light from the signal light input section (2) and the reference wavelength light inputted as TE polarized light from the reference wavelength light input section (4).
), the wavelength of the output light converted and outputted by the wavelength conversion semiconductor laser (1) is set to approximately the same wavelength as the reference wavelength light, and one end face of the wavelength conversion semiconductor laser (1) is provided with a By inputting the combined light of the polarizing beam splitter (7), the wavelength converting semiconductor laser (1)
A wavelength-synchronized optical wavelength conversion device characterized in that an output light of a stable wavelength with little wavelength fluctuation, which is synchronized with the reference wavelength light, is obtained from a signal light output section (5) on the other end face by an injection-locked operation. (4) A wavelength conversion semiconductor laser (1) that converts a signal light input into light of a different wavelength different from the wavelength of the signal light and outputs it; and a reference wavelength light that generates a reference wavelength light of a stable wavelength. Generating part (
3), inputting the signal light inputted from the signal light input section (2) as TM polarized light into one end surface of the wavelength conversion semiconductor laser (1), and transmitting the wavelength conversion semiconductor laser (1) from the end surface.
A polarizing beam splitter (7) that outputs the output light of 1) as TE polarized light from the signal light output section (5), and converts the wavelength of the output light converted and outputted by the wavelength conversion semiconductor laser (1) into a The wavelength conversion semiconductor laser (1) is made to have a wavelength substantially equal to that of the reference wavelength light, and the reference wavelength light is inputted from the reference wavelength light input section (4) on the other end surface of the wavelength conversion semiconductor laser (1). (
Through the injection locking operation in 1), the signal light output section (5
) A wavelength-synchronized optical wavelength conversion device characterized in that it is obtained from: