WO2023175691A1 - Dispositif de conversion de longueur d'onde - Google Patents

Dispositif de conversion de longueur d'onde Download PDF

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Publication number
WO2023175691A1
WO2023175691A1 PCT/JP2022/011442 JP2022011442W WO2023175691A1 WO 2023175691 A1 WO2023175691 A1 WO 2023175691A1 JP 2022011442 W JP2022011442 W JP 2022011442W WO 2023175691 A1 WO2023175691 A1 WO 2023175691A1
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light
wavelength
frequency
wavelength conversion
polarization
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PCT/JP2022/011442
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English (en)
Japanese (ja)
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毅伺 梅木
拓志 風間
晃次 圓佛
貴大 柏崎
飛鳥 井上
啓 渡邉
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日本電信電話株式会社
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Priority to PCT/JP2022/011442 priority Critical patent/WO2023175691A1/fr
Publication of WO2023175691A1 publication Critical patent/WO2023175691A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/37—Non-linear optics for second-harmonic generation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves

Definitions

  • the present invention relates to optical parametric wavelength conversion using second-order nonlinearity.
  • a wavelength conversion device In optical communications, a wavelength conversion device is used to convert the wavelength of input light to an arbitrary wavelength.
  • optical nodes require technology to quickly switch the wavelength of an optical signal containing information to another wavelength, and to switch optical paths stably at high speed.
  • Wavelength conversion technology that uses the second-order nonlinearity of periodically poled devices to achieve quasi-phase matching (QPM) is being applied to a variety of fields due to its high conversion efficiency.
  • QPM quasi-phase matching
  • variable optical parametric wavelength conversion is realized by using sum frequency generation (SFG) and difference frequency generation (DFG) in a cascade.
  • FIG. 1 is a diagram showing the configuration of a conventional cascade type variable optical wavelength conversion device.
  • the wavelength conversion device 1 includes a wavelength tunable light source 7 that generates a first excitation light (Pumnp1) 15 and a wavelength tunable light source 8 that generates a second excitation light (Pumnp2) 16.
  • the two pump lights 15 and 16 are amplified by EDFAs (Erbium Doped Fiber Amplifiers) 9 and 10, respectively, and then combined by a coupler 11.
  • EDFAs Erbium Doped Fiber Amplifiers
  • the signal light 14 from the optical fiber 2 is also amplified by the EDFA 4, combined with the two combined pump lights 15 and 16 by the coupler 5, and input to the secondary nonlinear optical element 6.
  • the secondary nonlinear optical element 6 includes, for example, a periodically poled lithium niobate (PPLN) element that is a nonlinear optical medium.
  • PPLN periodically poled lithium niobate
  • FIG. 2 is a diagram illustrating the operating principle of a conventional cascade type variable optical wavelength conversion device.
  • FIG. 2 is a diagram illustrating the positional relationship of each light on the angular frequency ⁇ axis, and shows the process of obtaining the wavelength-converted light 18 from the signal light 14.
  • two pump lights 15 and 16 are input to the second-order nonlinear optical element.
  • ⁇ SFG ⁇ S A sum frequency light (Sum) 17 having a frequency of + ⁇ P1 is generated.
  • the frequency of the output converted light 18 can be varied. Because the two processes are used in sequence, it is called a wavelength conversion device with a cascade configuration.
  • a variable dispersion compensator that combines the variable optical parametric wavelength converter shown in FIGS. 1 and 2 and a wavelength-dependent dispersion medium has also been proposed (Non-Patent Document 2).
  • the above-described tunable optical wavelength conversion device has a problem in that the speed of wavelength conversion switching is limited due to the final stage tunable filter. Further, there is a problem in that unnecessary crosstalk light is generated due to other secondary wavelength conversions in the above two processes, and the quality of the converted light is degraded. Furthermore, there is a limit to the wavelength range of signal light that can be converted. Furthermore, due to the polarization-dependent operating characteristics of the secondary nonlinear optical element, it has not been possible to realize polarization-independent variable wavelength conversion or a variable wavelength conversion device for polarization multiplexed signals.
  • the present invention realizes a high-quality wavelength conversion device that is capable of high-speed switching, has no limit on the range of converted wavelengths, and is compatible with polarization multiplexed light.
  • One embodiment of the present invention is a wavelength conversion device that converts the wavelength of signal light into an arbitrary different wavelength, which has a nonlinear medium with a phase matching wavelength ⁇ PM , and converts signal light and excitation light into sum frequency light. and a second nonlinear element that generates difference frequency light from the sum frequency light and control light, and the excitation light has the phase matching wavelength ⁇ PM on the frequency axis. has an optical frequency on the opposite side from the signal light with respect to the optical frequency f PM corresponding to the signal light, and is separated by a difference ⁇ f between the optical frequency f PM and the optical frequency f S of the signal light; This is a wavelength conversion device that outputs frequency light as converted light.
  • the present invention provides a novel configuration of a high-quality wavelength conversion device that is capable of high-speed switching.
  • FIG. 1 is a diagram showing the configuration of a conventional cascade type variable optical wavelength conversion device.
  • FIG. 2 is a diagram illustrating the principle of wavelength conversion in a conventional variable optical wavelength conversion device.
  • 1 is a diagram showing the configuration of a variable wavelength conversion device according to Embodiment 1 of the present disclosure.
  • 2 is a diagram illustrating the operating principle of the variable wavelength conversion device of Embodiment 1.
  • FIG. FIG. 3 is a diagram showing the configuration of a variable wavelength conversion device according to a second embodiment of the present disclosure.
  • FIG. 7 is a diagram illustrating the operating principle of a variable wavelength conversion device according to a second embodiment.
  • FIG. 7 is a diagram showing the configuration of a variable wavelength conversion device according to Embodiment 3 of the present disclosure.
  • FIG. 7 is a diagram illustrating the operating principle of the variable wavelength conversion device of Embodiment 3.
  • FIG. 7 is a diagram showing the configuration of an integrated variable wavelength conversion device according to Embodiment 4 of the present disclosure.
  • the tunable wavelength conversion device of the present disclosure provides a novel wavelength conversion device configuration that eliminates or alleviates the drawbacks and limitations of the prior art.
  • the variable wavelength conversion device of the present disclosure realizes a nonlinear process occurring simultaneously in a single nonlinear optical medium in a cascade type variable wavelength conversion device by dividing it into two nonlinear optical media. Since only the control light needs to be removed on the output side, there is no need for a variable wavelength filter as in the prior art, and high-speed wavelength switching can be achieved using a fixed filter. There is also no limit to the conversion wavelength range of the wavelength-converted light. By using one nonlinear optical element for different nonlinear processes depending on the propagation direction of light, it is possible to simplify the configuration, reduce the size, and reduce the cost.
  • the output of the wavelength conversion device 1 includes, in addition to the target wavelength-converted light 18a, a signal light 14a, a first pumping light 15a, a second pumping light 16a, and a sum frequency light. Contains 17.
  • the signal light 14a and the second excitation light 16a that is varied according to the signal light vary. Therefore, a wavelength tunable filter is required on the downstream side of the wavelength conversion device 1. It takes time to switch the transmission wavelength of the wavelength tunable filter, which limits the operating speed of the wavelength conversion device.
  • wavelength-converted light 18 having a desired wavelength (frequency) can be obtained as shown in the following equation.
  • ⁇ Conv ( ⁇ S + ⁇ P1 ) - ⁇ P2 Equation (1)
  • the two processes 20 and 21 shown in FIG. 2 can be regarded as a cascade relationship from the perspective of the causal relationship until the converted light is generated.
  • the conversion occurs simultaneously in a single nonlinear optical medium until the converted light reaches a stable state. Therefore, an unintended combination of the four lights shown in FIG. 2 causes an unintended conversion.
  • the first excitation light 15 and the second excitation light 16 are incident on the same nonlinear optical medium, the following unnecessary secondary wavelength conversion occurs, and these conversions cause crosstalk light. was occurring.
  • the first excitation light 15a is output as is from the secondary nonlinear optical element 6. Therefore, the signal light cannot be converted to the same frequency as the first pumping light 16.
  • the first excitation light 15 is amplified by an EDFA (Erbium Doped Fiber Amplifier) 9, and its input level to the second-order nonlinear optical element 6 is high. .
  • EDFA Erbium Doped Fiber Amplifier
  • Converted light cannot be placed around the frequency of the first excitation light 16a from the secondary nonlinear optical element 6 either. As described above, there is a limit to the range in which the frequency of the target wavelength-converted light 18 can be varied, and a certain band has arisen in which the wavelength cannot be converted.
  • second-order nonlinear optical elements generally have polarization-dependent operating characteristics.
  • the conventional variable wavelength conversion device 1 shown in FIG. 1 is capable of wavelength conversion only for a single-polarized modulated signal. Tunable wavelength conversion without polarization dependence or variable wavelength conversion for polarization multiplexed signals has not been achieved.
  • variable wavelength conversion device of the present disclosure presents a novel configuration that solves the above-mentioned problems.
  • Various embodiments will be described, including a basic configuration, a configuration compatible with polarization multiplexed light, and a configuration suitable for integration. [Embodiment 1]
  • FIG. 3 is a diagram showing the configuration of a variable wavelength conversion device according to Embodiment 1 of the present disclosure.
  • the wavelength conversion configuration 100 to an arbitrary wavelength in FIG. 3 includes an input transmission line 102 that propagates the target signal light 120, a variable wavelength conversion device 101, and a wavelength filter 103 that extracts only the wavelength-converted light 124.
  • the wavelength conversion device 101 receives signal light 120 having an arbitrary wavelength and modulated by a data signal, and outputs wavelength-converted light 124 having a different wavelength from the signal light and maintaining the modulation state by the same data signal. do.
  • the wavelength conversion by the variable wavelength conversion device of the present disclosure also performs frequency conversion at the same time, and will be simply referred to as "converted light" in the following description for simplicity.
  • the input transmission line 102 is typically an optical fiber, but may also be an optical waveguide in an optical circuit or any other optical transmission line. Further, what is input to the variable wavelength conversion device 101 is not limited to only signal light, but also light that is not modulated by a data signal can exhibit similar effects in terms of wavelength switching speed and wavelength switching range.
  • the input signal light 120 may be modulated by a data signal.
  • the signal light 120 is generated, for example, by optically modulating continuous wave (CW) light from a light source (not shown) with a data signal using an optical modulator or the like.
  • CW continuous wave
  • a light source not shown
  • optical modulator or the like.
  • a 10 Gbps NRZ-OOK (On-Off Keying) signal is input, but the signal light 120 is not limited to intensity modulation such as OOK.
  • a phase shift keying (PSK) signal such as DPSK or BPSK may be used, or a multilevel signal modulation signal such as QPSK or QAM having more than two signal points may be used.
  • the signal light 120 can be modified by modulating the CW light from one of a plurality of light sources with different wavelengths or the CW light from a variable wavelength light source with a data signal. can be generated.
  • signal light having an arbitrary wavelength in the C band (1525 to 1565 nm) is input.
  • the wavelength conversion device 101 includes an EDFA 104 that optically amplifies the signal light 120 and a first nonlinear optical element 106. Furthermore, it includes a first variable wavelength light source 109 that generates pump light 121 and an optical multiplexer 105 that combines the amplified signal light and the pump light 121. It also includes a second wavelength tunable light source that generates control light 122 and a second nonlinear optical element 107 .
  • FIG. 4 is a diagram illustrating the operating principle of the variable wavelength conversion device of Embodiment 1. Two processes 20 and 21 are shown until the signal light 120 is wavelength converted into converted light 124.
  • the SFG process 20 in FIG. 3 is a process in which the first nonlinear optical element 106 generates sum frequency light 123 from the signal light 120 and the excitation light 121.
  • the DFG process 21 in FIG. 3 is a process in which the second nonlinear optical element 107 generates converted light 124 from the control light 122 and the sum frequency light 123.
  • the configuration and operation of each part of the wavelength conversion device in FIG. 3 will be explained with reference to FIG. 4 as well.
  • the signal light 120 amplified by the EDFA 103 is multiplexed with the pump light 121 from the first wavelength tunable light source 109 using the optical multiplexer 105.
  • the combined signal light 120 and excitation light 121 are input to the first nonlinear optical element 106.
  • the first nonlinear optical element 106 has a first nonlinear optical medium 114 capable of generating a second harmonic for light with a wavelength of 1545 nm.
  • the first nonlinear optical medium 114 generates second harmonic light with a wavelength of 772.5 nm from light with a wavelength of 1545 nm.
  • the wavelength of 1545 nm at which the second harmonic can be generated is called the phase matching wavelength of the first nonlinear optical medium.
  • the difference ⁇ f (
  • the wavelength of the excitation light 121 may be set so that the optical frequency is symmetrically detuned from the optical frequency f PM by S
  • the excitation light is on the opposite side of the signal light to the optical frequency f PM corresponding to the phase matching wavelength ⁇ PM on the frequency axis, and the difference between the optical frequency f PM and the optical frequency f S of the signal light is They have optical frequencies separated by ⁇ f.
  • the first nonlinear optical element 106 has a filter or dichroic mirror 110 that separates the signal light 120a and excitation light 121a from the sum frequency light 123 on the output side of the first nonlinear optical medium.
  • the sum frequency light 123 separated from the first nonlinear optical element 106 is input to the second nonlinear optical element 107 via the optical fiber 111.
  • excitation light 121 from the first wavelength tunable light source 109 is directly input to the first nonlinear optical element 106.
  • an optical amplifier (not shown) may be placed in front of the optical coupler 105 to amplify it.
  • the sum frequency light 123 is supplied from the first nonlinear optical element 106 to the second nonlinear optical element 107.
  • the signal light 120a and the excitation light 121a input to the first nonlinear optical element 106 are separated to the outside of the element by the dichroic mirror 110 and disappear. Therefore, only the sum frequency light 123 necessary for the DFG process 21 shown in FIG. 4 is input to the second nonlinear optical element 107.
  • the second nonlinear optical element 107 includes a dichroic mirror 112 on the input side, a second nonlinear optical medium 115 that generates a difference frequency light between the sum frequency light 123 and the control light 122, and a filter/dichroic mirror 113 on the output side.
  • the dichroic mirror 112 on the input side combines the sum frequency light 123 and the control light 122.
  • the filter/dichroic mirror 113 on the output side separates the converted light 124a and the sum frequency light 123a, and the sum frequency light 123a disappears outside the element.
  • the DFG process 21 in the second nonlinear optical medium 115 generates a difference frequency light between the sum frequency light 123 and the control light 122, which becomes converted light 124.
  • the wavelength of the sum frequency light 123 remains unchanged regardless of the wavelength of the signal light 120 input to the wavelength conversion device.
  • the wavelength of the converted light 124 can be arbitrarily set.
  • the sum frequency light 123 is separated by the filter/dichroic mirror 113, and the wavelength conversion device 101 outputs converted light 124a and control light 122a.
  • the modulation according to the data modulation of the input light is maintained as it is.
  • the control light is on the opposite side of the difference frequency light with respect to the frequency f PM corresponding to the phase matching wavelength ⁇ PM on the frequency axis, and is the light of the frequency f PM and the difference frequency light. It has an optical frequency that is separated from the frequency f Conv by a difference ⁇ F.
  • the unnecessary control light 122a can be separated using the optical filter 103 on the output side of the wavelength conversion device 101, and only the converted light 124 can be output.
  • Signal light 120 having an arbitrary wavelength and modulated with a data signal can be wavelength-converted to an arbitrary wavelength and output while maintaining the modulated data.
  • the wavelength conversion device of this embodiment is a wavelength conversion device 101 that converts the wavelength of signal light into an arbitrary different wavelength, and includes a nonlinear medium 114 with a phase matching wavelength ⁇ PM , and includes a signal light 120 and a pumping light 121. , a first nonlinear element 106 that generates a sum frequency light 123, and a second nonlinear element 107 that generates a difference frequency light from the sum frequency light and the control light 122.
  • the optical frequency f PM corresponding to the phase matching wavelength ⁇ PM is on the opposite side from the signal light, and is separated by the difference ⁇ f between the optical frequency f PM and the optical frequency f S of the signal light.
  • the difference frequency light can be outputted as converted light.
  • the nonlinear optical medium for performing the SFG process 20 and the nonlinear optical medium for performing the DFG process 21 are separated to utilize spatially and temporally separate nonlinear processes. ing. As shown in FIG. 1, unnecessary secondary wavelength conversion does not occur as in the conventional cascade-type variable optical wavelength conversion device in which the SFG process 20 and the DFG process 21 occur simultaneously using a single nonlinear optical medium. Specifically, in the SFG process 20 in the first nonlinear optical element 106, the control light 122 cannot be mixed. Further, neither the signal light 120 nor the excitation light 121 can be mixed in the DFG process 21 in the second nonlinear optical element 107. Light can be converted to any wavelength without secondary conversions such as in equations (2) to (5) above and without deterioration in quality of the converted light.
  • control light 122 By setting the control light 122 to the same wavelength as the signal light 120, converted light having the same wavelength as the excitation light 121 can be output. Therefore, unlike the conventional cascade-type variable optical wavelength conversion device, there is no limit to the wavelength range of the converted light.
  • the wavelength variable range of the control light 122 is determined in advance, there is no need to use a variable optical filter that has a limited switching speed as in the prior art as the optical filter 103 to be separated at the final stage.
  • the wavelength variable range of the control light 122 is set to a wavelength longer than the phase matching wavelength (1545 nm)
  • the resulting converted light 124 will always have a wavelength shorter than the phase matching wavelength. Therefore, it is sufficient to use an optical filter (HPF) that transmits only wavelengths shorter than the phase matching wavelength.
  • HPF optical filter
  • variable wavelength range of the control light 122 is set to a wavelength shorter than the phase matching wavelength, the resulting converted light will always have a wavelength longer than the phase matching wavelength. Therefore, it is sufficient to use an optical filter (LPF) that transmits only wavelengths longer than the phase matching wavelength. This is because the signal light 120 and the pumping light 121 are not output at the output point of the wavelength conversion device 101. It will be appreciated that simple filters can be used to separate control light 122a and converted light 124a.
  • LPF optical filter
  • the C band (1525 nm to 1565 nm) was used as an example of the input signal light, but it goes without saying that the same operation can be performed with other wavelength bands.
  • the signal light is a single polarized wave and is controlled by the polarization generated by the wavelength conversion process of the SFG process 20 and the DFG process 21 shown in FIG. 4 in two nonlinear media. It is assumed that there is. Therefore, for example, the wavelength conversion device 101 having the configuration of the first embodiment, which includes a nonlinear element that produces a second-order nonlinear effect on a single TE polarized signal light, converts when a TE polarized signal light is incident. Wavelength conversion is performed without loss.
  • the optical fiber used for the transmission line 102 is generally a single mode fiber, the polarization state of the signal light transmitted to the wavelength conversion device is not determined. Therefore, even if the signal light contains only a single polarized wave, it may enter the wavelength conversion device 101 in a state containing other polarized light components. In an extreme case, if signal light is incident in a polarization state orthogonal to the polarization state in which the nonlinear element included in the wavelength conversion device operates, the efficiency of wavelength conversion will be significantly reduced. Furthermore, the signal light itself may be polarization multiplexed.
  • FIG. 5 is a diagram showing the configuration of a variable wavelength conversion device according to Embodiment 2 of the present disclosure.
  • the wavelength conversion configuration 200 to an arbitrary wavelength in FIG. 5 includes an input transmission line 202 that propagates the target signal light 220, a variable wavelength conversion device 201, and a wavelength filter 203 that extracts only the wavelength-converted light 224.
  • the wavelength conversion device 201 inputs a signal light 220 having an arbitrary wavelength, modulated by a data signal, and polarization multiplexed, and converts the modulation state by the same data signal, which has a different wavelength from the signal light, and the polarization.
  • the wavelength-converted light 224 is output while maintaining the multiplexed state.
  • the wavelength conversion device 101 of Embodiment 1 was operable for one specific polarization state.
  • the wavelength conversion device 201 of the second embodiment in FIG. 5 includes a polarization demultiplexer 212 for polarization-multiplexed signal light 220, and two systems of wavelength conversion blocks 230 that operate for each of two different polarization states. , 231, and a polarization multiplexer that combines converted lights of different polarization states.
  • the two wavelength conversion blocks 230 and 231 are arranged in parallel.
  • One system of wavelength conversion blocks includes a nonlinear optical element for the SFG process and a nonlinear optical element for the DFG process, similar to the wavelength conversion device 101 in FIG. 3.
  • the first nonlinear optical elements 207 and 208 generate sum frequency light from the signal light and the excitation light.
  • the second nonlinear optical elements 209 and 210 generate converted light from the control light and the sum frequency light.
  • the polarization-multiplexed signal light 220 is optically amplified by the EDFA 204, it is separated by the polarization splitter 212 into a first polarization signal light 220a and a second polarization signal light 220b.
  • the signal light 220a of the first polarization is wavelength-converted into the converted light 224a of the first polarization by the corresponding wavelength conversion block.
  • the signal light 220b of the second polarization is wavelength-converted into the converted light 224b of the first polarization by the corresponding wavelength conversion block.
  • the first polarized converted light 224a that has passed through the delay device 211 and the second polarized converted light 224b that has passed through the variable optical attenuator (VOA) 212 are polarized again by the polarization multiplexer 213. Multiplexed.
  • the signal light to be wavelength converted is described as a polarization multiplexed signal light 220, but a single polarized signal light is in a state where two polarized waves are mixed due to polarization rotation etc. Please note that this also includes cases where the Even for single polarized signal light in which two polarized waves are mixed, the signal light can be converted to any wavelength without conversion loss.
  • Pumping light for each wavelength conversion block is supplied from a common first wavelength variable light source 215.
  • the excitation light 221 is branched by an optical demultiplexer 217, combined with polarization-separated signal lights 220a and 220b, and input to nonlinear optical elements 207 and 208 for the SFG process.
  • Control light for each wavelength conversion block is also supplied from a common second wavelength variable light source 216.
  • the control light 221 is also branched by an optical demultiplexer 218 and input to nonlinear optical elements 209 and 210 for the DFG process, respectively.
  • the above-mentioned components are connected to each other by optical fibers or the like.
  • the wavelength conversion operation in each wavelength conversion block is generally the same as the operation of the wavelength conversion device 101 in Embodiment 1 described in FIG. 3.
  • an example is shown in which a nonlinear optical medium with a phase matching wavelength different from that in Embodiment 1 is used, and the operation of one wavelength conversion block 230 for the first polarized light is as follows.
  • the first polarization and the second polarization may be, for example, TE polarization and TM polarization that are orthogonal to each other.
  • Another example of the first polarization and the second polarization is when polarization multiplexed signal light changes to an arbitrary state through optical fiber transmission. Two polarized waves may be obtained when light is separated into two orthogonal polarized states.
  • each of these two separated polarizations becomes a mixture of two independent signal components of the original polarization multiplexed signal.
  • the Two polarized waves may be used.
  • the combined signal light 220a and excitation light 221 are input to the first nonlinear optical element 207.
  • the first nonlinear optical element 207 has a first nonlinear optical medium capable of generating a second harmonic for light with a wavelength of 1565 nm.
  • the first nonlinear optical medium outputs second harmonic light with a wavelength of 782.5 nm from light with a wavelength of 1565 nm.
  • the phase matching wavelength of the first nonlinear optical medium is 1565 nm.
  • the difference ⁇ f (
  • the excitation light 221 may be set so that the optical frequency is symmetrically detuned from the optical frequency f PM by S
  • sum frequency light having a wavelength that matches the wavelength of the second harmonic light can always be generated from the signal light and the excitation light.
  • the optical frequency and wavelength of this sum frequency light remain unchanged.
  • the first nonlinear optical element 207 has a filter or dichroic mirror that separates the signal light 220a and excitation light 221a from the sum frequency light 223a on the output side of the first nonlinear optical medium.
  • the sum frequency light 223a separated from the first nonlinear optical element 207 is input to the second nonlinear optical element 209 via an optical fiber.
  • the second nonlinear optical element 209 has a dichroic mirror on the input side, a second nonlinear optical medium that generates a difference frequency light between the sum frequency light 223a and the control light 222, and a filter/dichroic mirror on the output side.
  • the dichroic mirror on the input side combines the sum frequency light 223a and the control light 222.
  • the filter/dichroic mirror on the output side separates the converted light 224a and the sum frequency light 223c, and the sum frequency light 223c disappears outside the element.
  • FIG. 6 is a diagram illustrating the operating principle of the variable wavelength conversion device of Embodiment 2.
  • a process from polarization multiplexed signal light 220 to output of wavelength converted light 224 which is modulated with the same data signal and maintains the polarization multiplexed state as it is will be described.
  • a process 230-1 is performed until the signal light 220a is wavelength converted into converted light 224a.
  • a process 231-1 is performed until the signal light 220b is wavelength converted into converted light 224b.
  • the DFG process in the second nonlinear optical element 209 generates a difference frequency light between the sum frequency light and the control light, and a converted light 224a is generated.
  • the wavelength of the sum frequency light remains unchanged regardless of the wavelength of the signal light 220a input to the wavelength conversion block 231.
  • the wavelength of the converted light 224a can be arbitrarily set.
  • the sum frequency light 223a is separated by a filter/dichroic mirror, and the wavelength conversion block 231 outputs converted light 224a and control light.
  • the same modulation as the data modulation of the input light is maintained.
  • the explanation of the operation of the wavelength conversion block 230 for the above-mentioned first polarized wave is based on the operation of the other wavelength conversion block 231 for the second polarized signal light 220b separated by the polarization separator 212. It can be applied as is. That is, the first nonlinear optical element 207 and the second nonlinear optical element 209 may be replaced with the third nonlinear optical element 208 and the fourth nonlinear optical element 210, respectively.
  • the signal light 220a, the sum frequency lights 223a and 223c, the converted light 224a, and the excitation light 221a may be replaced with the signal light 220b, the sum frequency lights 223b and 223d, the converted light 224b, and the excitation light 221b, respectively.
  • the phase matching wavelengths of the nonlinear optical media in corresponding nonlinear optical elements are the same. Therefore, the same explanation will not be repeated here.
  • the delay device 211 can adjust the delay time difference between the first polarized converted light 224a from the wavelength conversion block 230 and the second polarized converted light 224b from the wavelength conversion block 231. Further, the VOA 212 can adjust the level difference between the first polarized converted light 224a from the wavelength conversion block 230 and the second polarized converted light 224b from the wavelength conversion block 231. Since the two wavelength conversion blocks have different polarizations, a difference in conversion efficiency may occur. Furthermore, differences in gain and delay may occur between polarized waves due to manufacturing variations in nonlinear optical media. The positions of the delay device 211 and the VOA 212 may be reversed to those shown in FIG. 5, or may be placed together in one of the wavelength conversion blocks.
  • the delay device 211 can be realized by, for example, a configuration in which a prism is used to fold back and output optical input, and the optical path length is varied by moving the prism back and forth using a micrometer or an electric motor. Furthermore, it is also possible to wrap an optical fiber called a fiber stretcher around a piezoelectric element (piezo element), and to vary the length of the optical fiber by physically expanding and contracting the piezo element by voltage driving. Furthermore, it can also be realized by a method of varying the refractive index of an optical fiber or optical waveguide using a thermo-optic effect or an electro-optic effect.
  • the VOA 212 can be realized, for example, by inserting a shielding plate into a part of the input/output with collimated light (parallel light).
  • a method can be used in which a window is placed in the optical path and the window is rotated to vary the coupling efficiency to the output due to translational deviation of the optical path.
  • a mirror such as a MEMS is provided between input and output, and the coupling efficiency to the output is varied by adjusting the mirror angle.
  • Converted lights 224a and 224b from the two wavelength conversion blocks are combined by a polarization multiplexer 213 to obtain polarization-multiplexed converted light 224c.
  • the control lights from the two wavelength conversion blocks are also combined, and a control light 222c appears, but it can be separated using an optical filter 203 on the output side and output only the converted light 224.
  • the signal light 220 having an arbitrary wavelength, modulated with a data signal, and polarization multiplexed is converted into an arbitrary wavelength and outputted while maintaining the modulation data and polarization multiplexing state. be able to.
  • the variable wavelength conversion device of this embodiment converts an optical signal, which is a polarization multiplexed signal light, which is input in an arbitrary polarization state, to an arbitrary wavelength while maintaining the modulation state and multiplexing state. I can do it. That is, when a single polarized signal light enters with a changed polarization state, it can be converted to any wavelength without conversion loss. Furthermore, even if the polarization state of the polarization multiplexed signal light changes and enters the input signal, the independent polarization components of the original polarization multiplexed signal light are maintained as they are, and the polarization state of the arbitrary wavelength can be changed. It can be converted into multiplexed signal light.
  • variable wavelength conversion device 201 of the second embodiment described above components such as the polarization separator 212, the first nonlinear optical element 207 to the fourth nonlinear optical element 210, and the polarization multiplexer 213 are formed using optical fibers or space. They were connected by an optical system. In such a configuration, if there is a difference in optical path length between the two wavelength conversion blocks 230 and 231 from the polarization splitter 212 to the polarization multiplexer 213, the polarization caused by polarization separation and recombination will occur. An inter-wave delay will occur. Therefore, it was necessary to adjust the optical path length using the delay device 211. However, the optical path difference in the optical fibers that connect the components changes depending on the environmental temperature, vibration, pressure, and the arrangement shape of the fibers. In some cases, this may become an obstacle to stably operating a polarization multiplexed device.
  • FIG. 7 is a diagram showing the configuration of a variable wavelength conversion device according to Embodiment 3 of the present disclosure.
  • a wavelength conversion configuration 300 to an arbitrary wavelength in FIG. 7 includes an input transmission line 302 that propagates the target signal light 320, a variable wavelength conversion device 301, and a wavelength filter 303 that extracts only the wavelength-converted light 324.
  • the wavelength conversion device 301 receives a signal light 320 having an arbitrary wavelength, modulated by a data signal, and polarization multiplexed, and converts the modulation state by the same data signal having a wavelength different from that of the signal light, and the polarization.
  • the wavelength-converted light 324 is output with the multiplexed state maintained as it is.
  • the wavelength conversion device 201 of the second embodiment described above includes two systems of wavelength conversion blocks 230 and 231 that operate for each of two different polarization states, and each wavelength conversion block operates for one polarization state. It was just working. Since two blocks having exactly the same configuration are required, not only are the configurations redundant, but the presence of physically separate blocks causes a difference in optical path length.
  • the wavelength conversion device 301 of this embodiment shown in FIG. 7 different nonlinear processes are used in one wavelength conversion element depending on the propagation direction of the target light.
  • Both the first nonlinear optical element 309 and the second nonlinear optical element 310 of the wavelength conversion device 301 generate sum frequency light from the signal light and the excitation light in one propagation direction, and the one propagation direction is In another opposite propagation direction, difference frequency light is generated from the control light and the sum frequency light.
  • the first nonlinear optical element 309 and the second nonlinear optical element 310 operate for either the SFG process or the DFG process depending on the propagation direction of the target light in the nonlinear optical medium. More specifically, it should be noted that in one nonlinear optical element, an SFG process for light in one propagation direction and a DFG process for light in another propagation direction occur independently and simultaneously.
  • the polarization separator 306, the first nonlinear optical element 309, and the second nonlinear optical element 310 form a loop.
  • the first polarized signal light 320a separated by the polarization separator 306 is wavelength-converted by the two nonlinear optical elements 309 and 310, and wavelength-converted light 324a is generated.
  • Ru In the left-handed (counterclockwise) loop, the second polarized signal light 320b separated by the polarization separator 306 is wavelength-converted by two nonlinear optical elements 310 and 309 to generate wavelength-converted light 324b. be done.
  • Polarization separator 306 operates as a polarization combiner when the input and output are reversed. Therefore, when wavelength-converted lights 324a and 324b of different polarizations are input to the output port of the polarization separator 306, polarization-multiplexed converted light is generated from the input port.
  • the signal light to be wavelength converted is described as a polarization multiplexed signal light 320, but a single polarized signal light is in a state where two polarized waves are mixed due to polarization rotation etc. Please note that this also includes cases where the Even for single polarized signal light in which two polarized waves are mixed, the signal light can be converted to any wavelength without conversion loss.
  • FIG. 8 is a diagram illustrating the operating principle of the variable wavelength conversion device of Embodiment 3.
  • FIG. 8 shows the process from polarization-multiplexed signal light 320 to output of wavelength-converted light 324 that is modulated with the same data signal and maintains the polarization-multiplexed state as it is.
  • the processes in the first and fourth stages, which are indicated as clockwise, correspond to the clockwise loop in FIG.
  • the process produces wavelength-converted light 324a.
  • the second and third steps labeled as counterclockwise correspond to the counterclockwise loop in FIG. Through the process, wavelength-converted light 324b is generated.
  • polarization-multiplexed signal light 320 propagating through a transmission path 302 such as an optical fiber is optically amplified by an EDFA 304 and then input to an optical circulator 305.
  • the signal light 320 is separated by the polarization splitter 306 into a first polarized signal light 320a and a second polarized signal light 320b.
  • the first polarized signal light 320a is wavelength-converted into a first polarized converted light 324a in a clockwise loop.
  • the signal light 320b of the second polarization is wavelength-converted into the converted light 324a of the second polarization in a counterclockwise loop.
  • the converted light 324a of the first polarization and the converted light 324b of the second polarization are polarization multiplexed again by the polarization separator 306 operating as a polarization combiner in opposite directions.
  • the polarization-multiplexed converted light passes through the circulator 305 to obtain converted light 322c.
  • Excitation light 321 is supplied from a first wavelength tunable light source 312, branched into two by an optical demultiplexer 313, and given to two locations in the loop by optical couplers 307 and 308.
  • One of the branched excitation lights is combined with the signal light 320a and input into the first nonlinear optical element 309 as a clockwise loop.
  • the other of the branched pump lights is combined with the signal light 320b and input into the second nonlinear optical element 310 as a counterclockwise loop.
  • the process in which the signal light is wavelength converted in the two nonlinear elements is the same as in the first and second embodiments, but the method of supplying the control light and the location where the DFG process occurs are different.
  • the operation of the clockwise loop will be explained, focusing on the differences.
  • the nonlinear optical medium of the first nonlinear optical element 309 has a phase matching wavelength of 1565 nm, and is capable of generating a second harmonic for light having the phase matching wavelength.
  • second harmonic light with a wavelength of 782.5 nm is output.
  • two lights having optical frequencies f 1 and f 2 that are symmetrically vertically detuned by ⁇ f on the frequency axis are input to this nonlinear optical medium from the optical frequency f PM corresponding to the phase matching wavelength, these two lights are A sum frequency light f Sum of light is generated. Since light symmetrically detuned from the optical frequency f PM on the frequency axis is input, the wavelength of the sum frequency light and the optical frequency f Sum match the wavelength of the second harmonic light and the optical frequency 2f PM .
  • the first nonlinear optical element 309 has a filter or dichroic mirror that separates the signal light 320c and excitation light 321a from the sum frequency light 323a on the output side of the nonlinear optical medium. The sum frequency light 323a separated from the first nonlinear optical element 309 is input to the second nonlinear optical element 310 via an optical fiber.
  • the control light 322 is supplied from the second wavelength tunable light source 314 on the right side of FIG. 7, passes through the optical isolator 315 and the optical demultiplexer 311, and is input from the right side of the drawing of the second nonlinear optical element 310.
  • the input from the right side of FIG. 7 is because the two nonlinear optical elements are arranged in a loop, and the nonlinear optical medium in the second nonlinear optical element 310 is inputted from the sum frequency light 323a and the control light 322a. propagate in the same direction. In this respect, there is no difference in the operation of the nonlinear optical element that performs the SFG process in the first and second embodiments.
  • the second nonlinear optical element 310 includes a dichroic mirror on the input side on the right side of the drawing, a nonlinear optical medium that generates difference frequency light between the sum frequency light 323a and the control light 322a, and a filter/dichroic mirror on the output side on the left side of the drawing.
  • the dichroic mirror on the input side on the right side of the drawing combines the sum frequency light 323a and the control light 322a.
  • the filter/dichroic mirror on the output side on the left side of the drawing separates the converted light 324a and the sum frequency light 323b, and the sum frequency light 323b disappears outside the element.
  • the DFG process in the second nonlinear optical element 310 generates a difference frequency light between the sum frequency light and the control light, and a converted light 324a is generated.
  • the wavelength of the sum frequency light remains unchanged regardless of the wavelength of the signal light 320a input to the first nonlinear optical element 309.
  • the wavelength of the converted light 324a can be arbitrarily set.
  • converted light 324a and control light are output. In the converted light 324a, the modulation according to the data modulation of the input light is maintained as it is.
  • the wavelength conversion operation in the clockwise loop for the first polarized signal light 320a described above also applies to the wavelength conversion operation in the counterclockwise loop for the second polarized signal light 320b.
  • the second nonlinear optical element 310 for the DFG process described above generates sum frequency light 323c having a wavelength that matches the wavelength of the second harmonic light from the signal light 320b and the pumping light 321.
  • the first nonlinear optical element 309 for the SFG process performs a DFG process that generates difference frequency light 324b from sum frequency light 323c and control light 322b. Converted light 324b and control light are output from the output side (left side in FIG.
  • the converted light 324b the modulation according to the data modulation of the input light is maintained as it is.
  • the first polarized converted light 324a and the second polarized converted light 324b are polarization multiplexed again by the polarization separator 306.
  • the polarization-multiplexed converted light 322c is wavelength-converted while maintaining a modulated state with the same data as the signal light 320 and a polarization-multiplexed state. Similar to the wavelength conversion device of the first and second embodiments, the converted light 322c and the control light 322c can be easily separated at low cost using a fixed optical filter.
  • both the first nonlinear optical element 309 and the second nonlinear optical element 310 can simultaneously and independently realize different nonlinear processes of DFG and SFG depending on the propagation direction of light.
  • One direction of propagation gives rise to an SFG process, and the other direction of propagation in the opposite direction gives rise to a DFG process.
  • PPLN, PPLT (periodically poled lithium tantalate), and PPKTP (periodically poled potassium titanyl phosphate) are typical nonlinear media that realize such functions.
  • the wavelength conversion device of this embodiment is a wavelength conversion device 301 that converts the wavelength of signal light into an arbitrary different wavelength, and is a wavelength conversion device 301 that converts the wavelength of signal light into an arbitrary different wavelength.
  • a first wave separator 306 and a nonlinear medium with a phase matching wavelength ⁇ PM which generates sum frequency light 323a from the first polarized signal light 320a propagating in a first direction and excitation light; a nonlinear element 309; and a second nonlinear element 310 that generates difference frequency light 324a of the first polarization from the sum frequency light and control light 322a propagating in a second direction
  • the nonlinear element, the second nonlinear element, and the polarization separator are connected in a loop, and the first nonlinear element and the second nonlinear element each perform sum frequency generation in one direction, Difference frequency generation is performed in another opposite direction, and the excitation light is on the opposite side of the signal light with respect to the optical frequency f PM corresponding to the phase
  • the polarization separator 306. has an optical frequency separated by a difference ⁇ f between the optical frequency f PM and the optical frequency f S of the signal light, and transmits the difference frequency of the first polarized wave to the two output ports of the polarization separator 306. It can be implemented by inputting the light 324a and the second polarized difference frequency light 324b and outputting the converted light 324c.
  • the wavelength conversion device 301 of this embodiment by using two nonlinear optical elements in the same loop in two directions, it is possible to simultaneously realize wavelength conversion of the first polarized light and the second polarized light. Since the components making up the loop are completely the same, there can be no difference in optical path length between the two polarizations.
  • the delay device 211 for adjusting the optical path length in the wavelength conversion device 201 of the second embodiment in FIG. 5 becomes unnecessary. Compared to Embodiment 2, the number of nonlinear optical elements is halved and no delay device is required, so the configuration of the device can be simplified and costs can be reduced.
  • the components are connected by optical fibers, spatial optical components, etc., but the components in the loop in FIG. 7 can be integrated into an optical integrated circuit and miniaturized.
  • an example in which two nonlinear optical elements and adjacent components are integrated on a chip is disclosed.
  • FIG. 9 is a diagram showing the configuration of an integrated variable wavelength conversion device according to Embodiment 4 of the present disclosure.
  • a wavelength conversion configuration 400 to an arbitrary wavelength in FIG. 9 includes an input transmission line 402 that propagates target signal light 420, a variable wavelength conversion device 401, and a wavelength filter 403 that extracts only wavelength-converted light 424.
  • the wavelength conversion device 401 receives a signal light 420 having an arbitrary wavelength, modulated by a data signal, and polarization multiplexed, and converts the modulation state by the same data signal having a wavelength different from that of the signal light, and the polarization.
  • the wavelength-converted light 424 is output with the multiplexed state maintained as it is.
  • the wavelength conversion configuration 400 is also the same as the configuration in Embodiment 3 in which a loop is formed by two nonlinear optical elements and a polarization separator. The differences are that two nonlinear optical elements and a polarization separator are integrated, a connection configuration between the two nonlinear optical elements, and a configuration that corrects the difference in conversion efficiency between polarizations. .
  • variable wavelength conversion device 401 of the fourth embodiment a polarization separation element 502, two nonlinear optical elements 503 and 504, and an optical coupler 506 that branches the control light 422 are integrated as a wavelength conversion chip 501.
  • the optical coupler 506 can be separated by the mirror element 505d, so it may be a separate chip from the wavelength conversion chip 501.
  • the branched pumping light 321 is combined with signal lights of different polarizations at two locations within the loop.
  • the polarization of the excitation light 421 is adjusted by the polarization adjuster 407, and then input to the wavelength conversion chip 501.
  • the polarization adjuster 407 adjusts the polarization of the excitation light 421 to be approximately 45° with respect to the polarization axis of the polarization separation element 502 in the wavelength conversion chip.
  • the excitation light 421 is input to the first nonlinear optical element 503 and the second nonlinear optical element 504 with substantially equal power.
  • the polarization multiplexed signal 420 and the polarization multiplexed pump light 421a are multiplexed by the SPF/LPF 408 and then enter the wavelength conversion chip 501 via the optical circulator 405.
  • the wavelength conversion operation in the loop formed by the polarization separation element 502 and the two nonlinear optical elements 503 and 504 in the wavelength conversion chip 501 is the same as in the third embodiment, so a detailed explanation will be omitted.
  • the difference from the configuration of Embodiment 3 due to integration lies in the configuration in which the sum frequency light generated in the SFG process of the nonlinear optical element in the preceding stage is guided to the DFG process of the nonlinear optical element in the subsequent stage.
  • the nonlinear optical elements were connected to each other by optical fibers.
  • two nonlinear optical elements 503 and 504 are connected by a wavelength multiplexing/demultiplexing section 505.
  • the wavelength multiplexing/demultiplexing section 505 is composed of three stages of multimode interferometers (MMI) 505a to 505c and a mirror element 505d which are connected in cascade.
  • MMI multimode interferometers
  • Each MMI of the wavelength multiplexing/demultiplexing unit 505 has one input waveguide and two output waveguides, and propagates the sum frequency light generated by one nonlinear optical element in a zigzag pattern to transmit the sum frequency light generated by the other nonlinear optical element. Guide the wave to the optical element.
  • the mirror element 505d has the function of an antireflection (AR) film for the wavelengths of the signal light, excitation light, and control light.
  • AR antireflection
  • the mirror element 505d functions as a high reflection (HR) film for the wavelength of sum frequency light.
  • the sum frequency light output from the nonlinear optical element 503 on the upper side of the figure enters the MMI 505b from the lower waveguide of the MMI 505a, and is totally reflected by the mirror element 505d.
  • the light then enters the upper waveguide of the MMI 505c and enters the lower nonlinear optical element 504.
  • the sum frequency light generated by one nonlinear optical element is guided to the other nonlinear optical element by the three stages of cascade-connected MMIs.
  • the control light 422b branched by the optical multiplexer 506 directly passes through the mirror element 505d and enters the nonlinear optical element 503.
  • the signal light 420b, the excitation light 421b, and the control light 422b are provided to the wavelength conversion chip 501 as in the case of the counterclockwise loop in the third embodiment of FIG.
  • the characteristic feature of the variable wavelength conversion device 401 of the fourth embodiment is that the integrated control light optical demultiplexer 506 can be configured to have a variable branching ratio.
  • the branching ratio can be controlled, for example, by configuring an interferometer using optical waveguides and changing the refractive index of one waveguide of the interferometer using thermo-optic or electro-optic effects, thereby making the output optical power variable. It is possible by doing this.
  • the optical path length becomes extremely stable, but there may be a difference in the wavelength conversion efficiency of the nonlinear optical medium between polarized waves. In this case, a level difference may occur between the converted light of the first polarization and the converted light of the second polarization.
  • By changing the branching ratio of the optical demultiplexer 506 and adjusting the level of the branched control light it is possible to compensate for the imbalance between the polarizations of the converted light.
  • Similar compensation for the level difference between polarized waves can also be achieved by slightly shifting the polarization angle set by the polarization adjuster 407 for the excitation light from 45°. Therefore, in the fourth embodiment, the level imbalance between polarized waves can be compensated for by either adjusting the branching ratio of the optical demultiplexer 506 of the control light or adjusting the polarization angle of the polarization adjuster 407. Either one of the mechanisms or both mechanisms may be provided.
  • the same configuration and functions as the wavelength conversion device of Embodiment 3 can be realized with an integrated chip, so that the wavelength conversion device can be made smaller and lower in cost.
  • the present invention eliminates various drawbacks of wavelength conversion devices with a cascade configuration in the prior art, and provides a variable wavelength conversion device that is capable of high-speed switching and has excellent performance.
  • the present invention can be used in optical communication systems.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

Un dispositif de conversion de longueur d'onde variable selon la présente divulgation comprend : un premier élément non linéaire (106) qui génère une lumière de fréquence de somme (123) à partir d'une lumière de signal (120) et d'une lumière de pompage (121) ; et un second élément non linéaire (107) qui génère une lumière de fréquence de différence (124a) à partir de la lumière de fréquence de somme (123) et de la lumière de commande (122).　Ce dispositif de conversion de longueur d'onde variable met en œuvre des processus non linéaires se produisant simultanément dans un seul support optique non linéaire dans un dispositif de conversion de longueur d'onde variable de type en cascade par division spatiale et temporelle des processus non linéaires entre deux milieux optiques non linéaires. Puisque seule la lumière de commande doit être retirée sur le côté sortie, un filtre à longueur d'onde variable dans l'état de la technique devient inutile, et ainsi une commutation de longueur d'onde à grande vitesse peut être obtenue par un filtre fixe. Il n'y a également pas de limite à la plage de longueurs d'onde de conversion de la lumière convertie.
PCT/JP2022/011442 2022-03-14 2022-03-14 Dispositif de conversion de longueur d'onde WO2023175691A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000241841A (ja) * 1999-02-18 2000-09-08 Oki Electric Ind Co Ltd 波長変換装置
JP2004093583A (ja) * 2002-07-12 2004-03-25 Nippon Telegr & Teleph Corp <Ntt> 波長変換回路及び波長変換方法
JP2005114897A (ja) * 2003-10-06 2005-04-28 Nippon Telegr & Teleph Corp <Ntt> 多波長一括波長変換器及び多波長一括波長変換方法
US20150092801A1 (en) * 2012-03-13 2015-04-02 Ole Bjarlin Jensen Laser system with wavelength converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000241841A (ja) * 1999-02-18 2000-09-08 Oki Electric Ind Co Ltd 波長変換装置
JP2004093583A (ja) * 2002-07-12 2004-03-25 Nippon Telegr & Teleph Corp <Ntt> 波長変換回路及び波長変換方法
JP2005114897A (ja) * 2003-10-06 2005-04-28 Nippon Telegr & Teleph Corp <Ntt> 多波長一括波長変換器及び多波長一括波長変換方法
US20150092801A1 (en) * 2012-03-13 2015-04-02 Ole Bjarlin Jensen Laser system with wavelength converter

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