WO2002086616A1 - Element fonctionnel optique et dispositif optionnel optique - Google Patents
Element fonctionnel optique et dispositif optionnel optique Download PDFInfo
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- WO2002086616A1 WO2002086616A1 PCT/JP2002/003274 JP0203274W WO02086616A1 WO 2002086616 A1 WO2002086616 A1 WO 2002086616A1 JP 0203274 W JP0203274 W JP 0203274W WO 02086616 A1 WO02086616 A1 WO 02086616A1
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- optical
- wavelength
- light
- input
- semiconductor
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- 230000003287 optical effect Effects 0.000 title claims abstract description 345
- 239000004065 semiconductor Substances 0.000 claims abstract description 120
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- GPXJNWSHGFTCBW-UHFFFAOYSA-N Indium phosphide Chemical compound [In]#P GPXJNWSHGFTCBW-UHFFFAOYSA-N 0.000 description 9
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- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
- 108010011485 Aspartame Proteins 0.000 description 3
- -1 N-formylamino Chemical group 0.000 description 3
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- OSEHTEQTVJQGDE-RYUDHWBXSA-N (3s)-3-formamido-4-[[(2s)-1-methoxy-1-oxo-3-phenylpropan-2-yl]amino]-4-oxobutanoic acid Chemical compound OC(=O)C[C@H](NC=O)C(=O)N[C@H](C(=O)OC)CC1=CC=CC=C1 OSEHTEQTVJQGDE-RYUDHWBXSA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- CKLJMWTZIZZHCS-REOHCLBHSA-N L-aspartic acid Chemical compound OC(=O)[C@@H](N)CC(O)=O CKLJMWTZIZZHCS-REOHCLBHSA-N 0.000 description 1
- MQUUQXIFCBBFDP-VKHMYHEASA-N N-formyl-L-aspartic acid Chemical compound OC(=O)C[C@@H](C(O)=O)NC=O MQUUQXIFCBBFDP-VKHMYHEASA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 235000003704 aspartic acid Nutrition 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- OQFSQFPPLPISGP-UHFFFAOYSA-N beta-carboxyaspartic acid Natural products OC(=O)C(N)C(C(O)=O)C(O)=O OQFSQFPPLPISGP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/004—Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, e.g. all-optical wavelength converter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
-
- 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
- G02F1/3515—All-optical modulation, gating, switching, e.g. control of a light beam by another light beam
-
- 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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/015—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 for the control of the intensity, phase, polarisation or colour based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction
- G02F1/017—Structures with periodic or quasi periodic potential variation, e.g. superlattices, quantum wells
- G02F1/01708—Structures with periodic or quasi periodic potential variation, e.g. superlattices, quantum wells in an optical wavequide structure
-
- 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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/30—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 grating
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/15—Function characteristic involving resonance effects, e.g. resonantly enhanced interaction
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/50—Amplifier structures not provided for in groups H01S5/02 - H01S5/30
- H01S5/5054—Amplifier structures not provided for in groups H01S5/02 - H01S5/30 in which the wavelength is transformed by non-linear properties of the active medium, e.g. four wave mixing
Definitions
- the present invention relates to a novel method for producing N-formyl neutral amino acid and N-formylaspartic acid, and further relates to a precursor of aspartame, N-formyl- ⁇ -L-aspartyl-L-phenylalanine methyl ester and aspartame.
- New production method Background Art
- ⁇ -Formylamino acids such as ⁇ ⁇ -formylaspartic acid and ⁇ ⁇ -formyl neutral amino acid, whose amino group is protected by a formyl group, are important compounds in the food and pharmaceutical fields as intermediates in the synthesis of various peptide compounds. is there.
- ⁇ -formylaspartic acid is an important compound as an intermediate for aspartame, a sweetener.
- a formyl group as an amino group protecting group for an amino acid can be introduced with a relatively inexpensive reagent. can do.
- As a method for synthesizing ⁇ ⁇ -formylaspartic acid for example, as shown in Reaction Step 1 below, aspartic acid is converted to ⁇ -formylaspartic anhydride using formic acid and acetic anhydride, followed by hydrolysis. For example, there is a known method (European Journal of Biochemistry, vol. 10, 318.323, 1969, pp. 318-323). 1969).).
- the present invention is suitable for an optical functional device for amplifying, controlling, or switching an optical signal, particularly for optical electronics such as optical communication, optical image processing, optical computer, optical measurement, and optical integrated circuit capable of advanced information processing.
- the present invention relates to an optical function device. Background art
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical functional device capable of directly processing an optical signal with light.
- the present inventor has made various studies with the above circumstances as background, and as a result, in the semiconductor optical amplifying element, input laser light of a specific wavelength, for example, first laser light of wavelength and second laser light of wavelength ⁇ 2 To change the intensity of the second laser beam In response to this, a change in the intensity of the first laser light occurs, and the change in the intensity of the first laser light changes in the opposite manner to the change in the intensity of the second laser light. It has been found that an optical functional device can be constructed. The present invention has been made based on such findings.
- the gist of the present invention is an optical functional element, which comprises: (a) for two or more input laser lights having different wavelengths, with respect to an intensity change of a laser light having a predetermined wavelength; A semiconductor optical amplifying element that reversely changes the intensity of light; (b) a wavelength selecting element that selects another wavelength of laser light to extract output light; and (c) a part of the output light is a semiconductor optical amplifier. And an optical feedback element for providing positive feedback to the input side of the element. In this way, in a semiconductor optical amplifier element in which input laser light of two or more wavelengths is made incident, laser light of another wavelength can be changed with respect to intensity change of laser light of one wavelength.
- the light intensity is changed, and only laser light of other wavelengths is selected by the wavelength selection element and extracted as output light.
- a part of the output light is fed back to the input side of the semiconductor optical amplifier by the optical feedback element.
- information processing can be performed with the optical signal as it is, so that high-speed information processing is possible, and at the same time, the modulation rate of the output optical signal is increased, and a high SZN ratio is obtained.
- the semiconductor optical amplifying element is a III-V group compound such as InGaAs, InGaAsP, AlGaAs, InGaA1N and the like. It is a semiconductor optical amplifier made of crystalline semiconductor. With this configuration, the semiconductor optical amplifier can be reduced in size, and at the same time, a high amplification factor can be obtained. Moreover, the wavelength for optical amplification can be arbitrarily selected by changing the composition ratio (mixed crystal ratio) of each mixed crystal semiconductor.
- the semiconductor optical amplifying element includes an optical waveguide for guiding the laser light, and an active layer that is a pn junction provided along a waveguide direction in the optical waveguide, Energy for exciting the inside of the active layer is injected.
- the semiconductor optical amplification element performs optical amplification in an active layer provided along a waveguide direction in an optical waveguide provided in a part of the semiconductor optical amplification element.
- the optical amplifying device can be downsized and high energy conversion efficiency can be obtained.
- the active layer is made of a group III-V mixed crystal semiconductor such as InGaAs, InGaAsP, A1GaAs, InGaA1N. It consists of bulk, quantum well, strained superlattice, or quantum dot. In particular, in the case of a quantum well, a strained superlattice, or a quantum dot, a higher response speed and a higher gain can be obtained as compared with a bulk active layer, and the modulation rate of output light can be increased.
- a group III-V mixed crystal semiconductor such as InGaAs, InGaAsP, A1GaAs, InGaA1N. It consists of bulk, quantum well, strained superlattice, or quantum dot.
- a quantum well, a strained superlattice, or a quantum dot a higher response speed and a higher gain can be obtained as compared with a bulk active layer, and the modulation rate of output light can be increased.
- the wavelength selecting element is a filtering film in which a part of an optical waveguide for guiding output light of the semiconductor optical amplifying element has a refractive index periodically changed in a waveguide direction. It is composed of any one of a multi-layer film, a light-absorbing substance, and a photonic crystal having a photonic band gap, in which a plurality of sets of layers having different refractive indexes are stacked.
- the wavelength selection element can be provided on a part or the end face of the optical waveguide of the semiconductor optical amplification element, the size of the optical functional device can be further reduced.
- the optical feedback element is a grating filter in which a part of an optical waveguide for guiding output light of the semiconductor optical amplifying element has a refractive index periodically changed in a waveguide direction. It is composed of one of the following: a multilayer film formed by laminating multiple sets of layers having different refractive indices, a photonic crystal having a photonic band gap, and an end face reflection suppressing film.
- the optical feedback element can be provided in a part of the optical waveguide for guiding the output light of the optical amplifying element.
- the device can be further miniaturized.
- any one of the above-mentioned optical functional elements connected in series is interposed between the optical functional elements, and the output light of the preceding optical functional element among the optical functional elements is output.
- An optical function device functioning as a device is configured. In this way, since the optical functional device is configured by the optical functional elements connected in multiple stages, the three-terminal optical operation device, the three-terminal optical switching device, and the optical demax (DE)
- MUX signal separation circuit
- FIG. 1 is a block diagram illustrating a configuration of an optical functional device according to one embodiment of the present invention.
- FIG. 2 is a perspective view illustrating the configuration of the semiconductor optical amplifying device in the embodiment of FIG.
- FIG. 3 is a cross-sectional view illustrating the configuration of the semiconductor optical amplifying device in the embodiment of FIG.
- FIG. 4 is a time chart for explaining input / output signals when a part of output light is subjected to positive feedback in the embodiment of FIG.
- FIG. 5 is a time chart for explaining input / output signals when a part of output light is not subjected to positive feedback in the embodiment of FIG.
- FIG. 6 is a time chart for explaining output signals when the input light having the wavelength ⁇ t is input and when it is not input in the embodiment of FIG.
- FIG. 7 is a diagram for explaining the input / output characteristics of the optical functional element in which the intensity of the input light having the wavelength is varied in the embodiment of FIG.
- FIG. 8 is a plan view illustrating the configuration of a three-terminal optical function device according to another embodiment of the present invention.
- FIG. 9 is a perspective view illustrating the configuration of the three-terminal optical function device according to the embodiment of FIG.
- FIG. 10 is a diagram illustrating control characteristics of output light in the three-terminal optical function device of the embodiment of FIG.
- FIG. 11 is a block diagram illustrating another embodiment of the optical functional device of FIG.
- FIG. 12 is a plan view illustrating another embodiment of the optical function device in FIG.
- FIG. 13 is a diagram illustrating the configuration of an optical functional device according to another embodiment of the present invention.
- C FIG. 14 is a time chart illustrating the operation of the optical functional device of the embodiment of FIG. 13.
- FIG. 15 is a diagram illustrating the configuration of an optical function device according to another embodiment of the present invention.
- FIG. 16 is a diagram illustrating a configuration of an optical function device according to another embodiment of the present invention.
- FIG. 17 is a time chart for explaining the operation of the optical function device of the embodiment of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- optical function (control) element 10 according to one embodiment of the present invention will be described in detail with reference to the drawings.
- FIG. 1 is a diagram schematically illustrating the configuration of the optical function element.
- the first laser light source 1 2 is, for example 1 5 4 0] first first force exits, single laser light 1 of a wavelength input 1 of 1111, the first optical modulator 1 4 is provided Propagate through one optical fiber.
- the second laser light source 1 6, for example 1 5 5 0 nm second out a second, single-laser light L 2 having a wavelength lambda 2 of the second optical fiber F 2 of the second optical modulator 1 8 is provided Propagate through.
- a variable wavelength semiconductor laser is used as the first laser light source 12 and the second laser light source 16.
- the first optical modulator 14 and the second optical modulator 18 pulse-modulate the passing light according to the electric signal from the signal generators 20 and 22 so as to become a pulse signal of the frequency of the signal.
- Light force bra (optical multiplexer) 2 4 connects the first light off eye and the second optical fiber F 2 to the third optical fiber F 3, they first optical fiber F t and the second optical fiber F 2 the superimposing the first laser light and the second laser beam L 2 having propagated, it is input to the semiconductor optical amplifier device 2 6 via the third optical fiber F 3.
- the skin length selection element 28 is connected to the output side of the semiconductor optical amplification element 26, and converts the light of the first wavelength ⁇ [ Select and output as output light.
- FIG. 1 shows the superimposed first laser light and second laser light L 2 and the output light L transmitted through the wavelength selection element 28.
- u and a pair of photodetectors 30 and 3 for monitoring
- the semiconductor optical amplifying element 26 is composed of a III-V group mixed crystal semiconductor such as InGaAsP mixed crystal semiconductor grown from a compound semiconductor such as an indium phosphide (InP) substrate 36.
- a III-V group mixed crystal semiconductor such as InGaAsP mixed crystal semiconductor grown from a compound semiconductor such as an indium phosphide (InP) substrate 36.
- the cap layer 42 grown to cover the optical waveguide 38 and the InP substrate 36 and a pair of electrode layers 44 and 46 fixed to the bottom surface of the InP substrate 36 and the upper surface of the cap layer 42, respectively.
- the optical waveguide 38 is provided on the upper surface of the InP substrate 36 in a state of being connected to the optical waveguide direction by removing both sides of the growth layer from the InP substrate 36 by etching, for example. ing.
- the refractive index of the optical waveguide 38 is made higher than that of the InP substrate 36 by using an InGaAsF mixed crystal semiconductor having a mixed crystal ratio that increases the refractive index. And it propagates in a confined state in the width direction.
- FIG. 2 is a perspective view showing the shape of the optical waveguide 38, in which the cap layer 42 and the electrode 46 fixed to the upper surface thereof are omitted.
- a current confinement structure for concentrating a current on the active layer 40 is provided as necessary.
- the active layer 40 is composed of, for example, a multiple quantum well, and grown by an InP substrate 36 and lattice-matched to the InGaAs (100 A thickness) and the InGaAsP barrier layer (1. 45 m composition, 10 OA thickness), and a guide layer having a shape (GR IN) structure whose composition (refractive index) is gradually changed on the active layer 40. (200 OA thickness).
- the device length of the active layer 40 (the length of the optical waveguide 38) is 600, for example, the voltage excited by energy injection with a current value of 200 mA.
- a part of the output light passed through the wavelength selection element 28 is reflected by the output-side end face of the optical function element 10 and passes through the optical waveguide 38 as shown in FIG. Then, the light is returned to the side of the semiconductor optical amplifier 26 and is reflected by the end face on the input side to be added to the input light. Even in such a partial propagation process of the output light, the modulation rate of the output light is increased by the amplification effect of the active layer 40. That is, a part of the output light is fed back positively. Therefore, in the present embodiment, the end face of the wavelength selection element 28 and the end face on the input side of the semiconductor optical amplification element 26 function as feedback elements, but may be constituted by an external mirror.
- the wavelength selection element 28 is a darting filter in which a part of the optical waveguide 38 for guiding the output light of the semiconductor optical amplification element 26 has a refractive index periodically changed in the waveguide direction.
- the second modulator 18 modulates the second laser beam L 2 at 1 kHz using the second modulator 18, and the second laser beam L 2 is modulated.
- the modulation rate M shown in the input light in FIG. An output light L which is a first laser light L having a wavelength shown in FIG. 4 from an input signal (second laser light L 2 ). The signal indicated by ui is obtained.
- the gain G of the semiconductor optical amplifier 26 is 15 dB, an inverted signal of the modulation factor M 40% is obtained.
- the gain G of the semiconductor optical amplifier 26 is set, for example, based on the amount of energy injected into the semiconductor optical amplifier 26.
- FIG. 5 shows the output light L obtained by providing a non-reflective coating on the output end face of the semiconductor optical amplifier 26. This is the case where a part of ut is not positively returned. Output light L according to the gain G of the optical amplifier 26. Although the modulation factor of ut is increased, the modulation factor M of the output light is low, and only about 30% can be obtained.
- FIG. 6 shows an experimental result showing the switching characteristics of the optical functional device 10.
- the second laser light L 2 which is the input light of the second wavelength ⁇ 2 of 1550 nm, is modulated at 500 MHz.
- the waveform change of ul is shown.
- Figure (a) of 6 1 540 nm output waveform shows the inverted waveform L.
- the first laser beam of the first wavelength to the input waveform L 2 is taken as 1 00 / W of a ul
- the signal strength of the output waveform shown in (a) is significantly increased as compared with the output waveform shown in (b).
- (a) was 200 W
- (b) was 10 W. It is increased 20 times by inputting the first laser light of the first wavelength of 100 W.
- the first laser beam L of the first wavelength a change characteristic of the output light intensity L OTL for strength
- the second intensity of the laser light L 2 of the second wavelength lambda 2 is 300 ill 6 00 ill 90 0
- the first laser beam L of the first wavelength was 200 W, while (b) was 10 W. It is increased 20 times by inputting the first laser light of the first wavelength of 100 W.
- the first laser beam L of the first wavelength a change characteristic of the output light intensity L OTL for strength
- the second intensity of the laser light L 2 of the second wavelength lambda 2 is 300 ill 6 00 ill 90 0
- the second laser beam L 2 is a second input light of the second wavelength lambda 2 is a semiconductor optical amplifier
- the first laser light which is input to the element 26 and has the second wavelength; the first wavelength ⁇ different from 2 , is the first input laser light by the optical power blur 24 functioning as a laser light input device.
- the second laser beam L 2 and the first laser beam are superimposed on each other, and the light from the semiconductor optical amplifier 26 is first inputted by the wavelength selection element 28.
- Output light L selected as light of wavelength ⁇ .
- the second record - a an amplified version of the signal change of laser light L 2. That is, although the second phase with respect to the laser beam L 2 which is modulated the input signal is inverted, the output light has a greater amplified signal strength signal intensity of the second laser beam L 2 L. ut is obtained.
- the above-mentioned amplification effect can be obtained even when the wavelength and ⁇ 2 are arbitrarily set in the wavelength band where the gain G of the semiconductor optical amplifier element 26 can be obtained. Is also obtained.
- the wavelength band in which the gain G can be obtained is about 100 nm. Therefore, broadband characteristics about twice as high as those obtained when the active layer 40 is bulk can be obtained.
- the semiconductor optical amplifying element 26 is formed of a III optical amplifier such as InGaAs, InGaAsP, AlGaAs, InGaA1N or the like. Since the optical amplifier is composed of a group V mixed crystal semiconductor, the optical amplifier becomes smaller as a whole, and a high amplification factor can be obtained. In addition, the wavelength for optical amplification can be arbitrarily selected by changing the composition ratio (mixed crystal ratio) of each mixed crystal semiconductor.
- the semiconductor optical amplifying element 26 is provided along the optical waveguide 38 for guiding the input laser light L 2 , and along the waveguide direction in the optical waveguide 38. And an active layer 40, which is a pn junction, into which energy for exciting the active layer 40 is injected. Therefore, the semiconductor optical amplifying element 26 is provided in a part thereof. Active layer 40 provided along the waveguide direction in the optical waveguide 38
- the optical function device 10 or the optical function device 52 can be reduced in size by one layer as compared with those using an optical fiber.
- the active layer 40 is formed of a material such as InGaAs, InGaAsP, A1GaAs, InGaA1N, or the like. It is composed of bulk group-mixed semiconductors, quantum wells, strained superlattices, or quantum dots. In particular, when a quantum well, strained superlattice, or quantum dot is used, high-speed response and high gain G are obtained, and the output light L is high. The modulation rate of ul is increased.
- the wavelength selection element 28 outputs the output light L of the semiconductor optical amplification element 26.
- a part of the optical waveguide 38 for guiding ul for example, a grating filter whose surface has a periodically changed refractive index in the waveguide direction, a multilayer filter formed by laminating a plurality of sets of layers having different refractive indexes, light Since it is made of either an absorbing material or a photonic crystal having a photonic band gap, the wavelength selecting element 28 is provided on a part or the end face of the optical waveguide 38 of the semiconductor optical amplifying element 26. Therefore, the optical function device can be further miniaturized.
- the output light L is the output light L of the semiconductor optical amplifier element 26.
- a part of the optical waveguide 38 for guiding the ul for example, a grating film having a surface whose refractive index is periodically changed in the waveguide direction, and a multilayer film formed by laminating a large number of layers having different refractive indexes.
- the filter is composed of any one of a filter, a photonic crystal having a photonic band gap, and an end face reflection suppressing film, a part of the output light can be provided by an optical fiber because it can be provided in a part of the semiconductor optical amplifier element 26.
- the optical function device 10 or the optical function device 52 can be reduced in size by one layer as compared with the case of returning.
- FIGS. 8 and 9 are diagrams illustrating a configuration of a three-terminal optical functional device 52 including a pair of semiconductor optical amplifiers 48 and 50 similar to the semiconductor optical amplifier 26.
- FIG. 8 is a plan view illustrating a specific configuration of the three-terminal optical function device 52
- FIG. 9 is a perspective view thereof. In FIGS. 8 and 9 as well, as in FIG.
- the first laser light (first input light: I in ) having a wavelength (155 nm) and the second laser light L 2 (wavelength ⁇ 2 (154 nm))
- the second input light: bias light I bia ) is superimposed by the first optical power blur 54 and input to the first semiconductor optical amplifying element 48, and of the light from the optical amplifying element 48
- the light selected for the wavelength ⁇ 2 by the first wavelength selection element 56 and the third laser light L 3 (third input light: control light I e ) having the wavelength are transmitted to the second optical power blur 58.
- the signal is superimposed and input to the second semiconductor optical amplifier 50.
- the pair of semiconductor optical amplifying elements 48 and 50 are the same as the semiconductor optical amplifying element 26 except that they are grown from a common compound semiconductor such as an indium phosphorus (InP) substrate 62. And an active layer 40 which is a pn junction provided along the waveguide direction in the optical waveguide 38, that is, along the longitudinal direction of the optical waveguide 38. When a current passing through the layer 40 is passed from the outside, energy for exciting the inside of the active layer 40 is injected. Between the optical waveguide 38 of the semiconductor optical amplifier element 48 and the optical waveguide 38 of the semiconductor optical amplifier element 50, for example, silicon Si glass (Ge doped silica) doped with germanium Ge is used.
- the first wavelength selection element 56 is constituted by a darting filter in which a part of the optical waveguide 64 is periodically changed in the waveguide direction. Have been. Since the above-mentioned Ge-doped silica can locally change the refractive index of the portion irradiated with the ultraviolet laser beam, the above-mentioned grating filter reflects the laser beam of the wavelength ⁇ 2 but the laser of the wavelength ⁇ 2 . The refractive index is periodically changed in the waveguide direction at high density by local irradiation of light so that the light passes.
- the semiconductor optical amplifying element 48 like the semiconductor optical amplifying element 26, has a part of the output light of the wavelength ⁇ 2 reflected by the first wavelength selecting element 56 and the semiconductor optical amplifying element 48. The light is reflected again at the input-side end face of No. 8 so that it is superimposed on the input light and is fed back positively.
- the waveguide 64 made of Ge-doped silica has the same cross-sectional shape as the waveguide 38 of the semiconductor optical amplifiers 48 and 50, and is connected in the longitudinal direction.
- a branch path 66 branched into a Y-shape is formed, and is incident on the second semiconductor optical amplification element 50.
- the portion of the waveguide 64 where the branch 66 is formed corresponds to the first optical power plug 58.
- the second wavelength selection element 60 is constituted by a multilayer bandpass filter in which a large number of sets of layers having different refractive indices are laminated, and blocks the second laser light having the wavelength ⁇ 2 (1540 nm).
- the first laser beam having the wavelength ⁇ , (1550 nm) is configured to pass therethrough and reflect at a predetermined ratio, for example, 5%. Therefore, only a part (5%) of the output light is positively fed back to the second semiconductor optical amplifying element 50, so that the second wavelength selecting element 60 of this embodiment also functions as an optical feedback element. ing. A part of the output light that has been positively fed back is reflected by the first wavelength selection element 56 and made incident again on the second semiconductor optical amplification element 50.
- the modulated wavelength input light (first laser light of 1550 nm) I in is superimposed on the bias light (second laser light L 2 ) I bias of wavelength ⁇ 2 (1540 nm).
- the strength of change of the input light I in is output as inverted intensity change of Baiasu light I bias
- the input light 1 ⁇ is the first wavelength selection element 56 Be cut.
- the control light (third laser light L 3 ) I e of the wavelength (1550 ⁇ m) is superimposed on the bias light I bias of the wavelength ⁇ 2 (1540 nm) at which the inversion intensity is changed, and the second is input to the semiconductor optical amplifier 5 0, the inverted intensity change of the wavelength lambda 2 of the bias light I bias is further inverted converted into intensity variation of the control light having a wavelength (15 5 onm), second wave length selected as the output light Passed through element 60.
- the output light I is output by the second wavelength selection element 60. Since a part of the ul is fed back positively, the modulation factor of the output light I ⁇ ⁇ ⁇ is greatly increased as compared with the input light.
- Fig. 10 shows the control light I e as a parameter
- FIG. 12 When the control light I e is not superimposed, almost no output light signal is obtained, whereas control I. Is superimposed on the output light I. ul increases. That is, the control light I having the wavelength ⁇ . Wavelength ⁇ !
- the output light of I. ul is shows a controllable der Rukoto, according to this embodiment, one light intensity controllable and multistage connectable 3 terminal optical operational amplifier with a laser beam having a wavelength, the three-terminal optical switching device Used as an optical demax device.
- the output signal light I. ui can obtain the same wavelength as the first wavelength of the first laser light L, (first input light: I in ), and have the same phase as the signal change of the first input light of the first wavelength and This is an amplified signal, which is advantageous because the input and output light have the same wavelength in the optical circuits connected in multiple stages. Also output light I. The signal is obtained by a part of ul being positively fed back to the second semiconductor optical amplifier 50.
- Modulation rate is increased and S / N is increased, so that multi-stage amplification can be stably performed.
- Figure 1 1 shows an optical functional device 1 0 'when one of the input laser beam I in the wavelength lambda 2 is caused to input to the semiconductor optical amplifier 2 6 of FIG. 1.
- the optical functional element 10 ′ of the present embodiment is, similarly to the optical functional element 10 of the aforementioned embodiment, composed of a semiconductor optical amplifying element 26 and a wavelength selecting element 28 fixed to the output side end face. It is configured.
- This wavelength selection element 28 is preferably formed of, for example, a diffraction grating or a Bragg reflector in which the refractive index of a part of the waveguide, for example, the surface is periodically changed in the waveguide direction.
- the wavelength region having the amplification gain including the wavelength ⁇ 2 is provided.
- the light intensity of the first wavelength ⁇ is changed by the wavelength selection element 28 from the wavelength range in which the light intensity of the first wavelength ⁇ is changed in response to the on / off state of the incoming laser beam I in . Is selected, and is amplified by the incident side end face of the optical function element 10, which functions as an optical resonator and a feedback element, and the end face of the wavelength selection element 28, and then output. Therefore, the same modulation as in FIG. 4 is performed.
- the first wavelength lambda of the light is incident on the semiconductor optical amplifier device 2 6, together with the broad spontaneous emission around the first wavelength A t is generated, the first
- the wavelength range having the amplification gain corresponds to the wavelength range of the spontaneous emission light, that is, the surrounding wavelength range.
- the semiconductor optical amplifier 4 8 and 5 0 constituting the optical functional device 5 2 of FIG. 8 one of the input laser beam I in the wavelength semiconductor optical amplifier 4 8 on the input side
- the optical function device 5 2 ′ when inputting is shown.
- the wavelength ⁇ , including the wavelength ⁇ , of the wavelength region having the amplification gain is included.
- the light is amplified by the incident-side end face of the optical function element 10 ′ functioning as an optical resonator and a feedback element and the wavelength selection element 56 before being output.
- the amplified wavelength lambda 2 of the laser beam with a wavelength of the control light (third? Intradermal length) I c and is input to the second semiconductor optical amplifier 5 0 are multiplexed by the optical power Bra 5 8 Is done.
- the output light I of the first wavelength ⁇ , selected by the second wavelength selection element 60, of the light input to the second semiconductor optical amplification element 50. ut is obtained.
- FIG. 13 shows an optical functional device according to another embodiment of the present invention.
- an optical feedback element 72 and a wavelength selection element 73 serving also as an optical feedback element are provided on both end faces, and an optical resonator formed by the optical feedback element 72 and the wavelength selection element 73 is provided.
- To the input light I; n (the semiconductor optical amplification element 70 similar to the semiconductor optical amplification elements 26, 48, 50 in which the first wavelength ⁇ is incident, and also serves as an optical feedback element 74 and an optical feedback element.
- the input light which is the output light of the semiconductor optical amplifying element 70, enters the optical resonator composed of the optical feedback element 74 and the wavelength selecting element 75 with the wavelength selecting elements 75 provided on both end faces.
- a semiconductor optical amplifier 71 similar to the semiconductor optical amplifier 26, 48, 50.
- the modulated input light I in (the first wavelength ⁇ is the semiconductor optical amplifier
- the semiconductor optical amplifying element 70 similar to 26 is input into the optical resonator and the light generated in the excited semiconductor optical amplifying element 70 is generated.
- Two wavelengths ⁇ 2 of light are selected by the wavelength selecting element 73 similar to the wavelength selecting element 28, 56, or 60, and optical resonance occurs.
- the amplified laser light of the second wavelength ⁇ 2 has the intensity by the modulated input light I in . It is modulated and output in reverse.
- the control light I e of the first wavelength ⁇ is superimposed on the laser light of the second wavelength ⁇ 2 by an optical multiplexer (optical power blur) 76, and is applied to the next-stage semiconductor optical amplifying element 71 in the excited state.
- the light having the wavelength ⁇ , which is input and selected by the wavelength selection element 75 similar to the wavelength selection element 72, is selectively selected by the pair of the optical feedback element 74 and the wavelength selection element 75 functioning as an optical resonator.
- FIG. 14 shows the input light I in and the control light I in the optical function device shown in FIG. , Output light I.
- the waveform of ut is shown. This output light I.
- the waveform of ut is greatly amplified with respect to the input light, and is controlled by the intensity-modulated control light of ⁇ ,.
- FIG. 15 also shows an optical functional device according to another embodiment of the present invention.
- the optical feedback element 72 and the wavelength selection element 73 serving also as the optical feedback element are provided on both end faces, and the optical feedback element 72 and the wavelength selection element 73 are provided in the optical resonator.
- the modulated input light I in (the first wavelength ⁇ is input to the semiconductor optical amplifier 70 into the optical resonator, and the light of the second wavelength ⁇ 2 generated in the excited semiconductor optical amplifier 70 is A pair of the optical feedback element 72 and the wavelength selection element 7, which are selected by the wavelength selection element 73 similar to the wavelength selection element 28, 56, or 60 and function as an optical feedback element or an optical resonator.
- the laser light of the second wavelength ⁇ 2 is selectively optically amplified by 3 and the laser light of the second wavelength ⁇ 2 is output after the bow angle is inversely modulated by the modulated input light I in .
- the control light I c of wavelength ⁇ ⁇ is superimposed on the laser light of ⁇ 2 by an optical multiplexer (optical power blur) 76 and input to one end surface of the next-stage semiconductor optical amplifier element 71 in the excited state.
- the output light of the wavelength lambda n which are selectively amplified selected and the wavelength selection element 7 5 Output from the semiconductor optical amplification element (7) 1.
- Optical functional device of this embodiment by arbitrarily changing the selected wavelength lambda eta wavelength lambda eta and wavelength selection element 7 5 of the control light, the first wavelength Or
- FIG. 16 also shows an optical functional device according to another embodiment of the present invention.
- an optical feedback element 72 and a wavelength selection element 73 serving also as an optical feedback element are provided on both end faces, and an optical resonator formed by the optical feedback element 72 and the wavelength selection element 73 is provided.
- a semiconductor optical amplifier 70 in which the input light I in (first wavelength ⁇ is incident); a traveling-wave semiconductor optical amplifier 71 in which no optical feedback element or wavelength selection element is provided on both end faces;
- a semiconductor optical amplifier element 80 provided with a feedback element 82 and a wavelength selection element 83 on both end faces, and having input light from the semiconductor optical amplifier element 71 incident through the optical feedback element 82 on one end face side.
- the modulated input light I in (the first wavelength is input to the semiconductor optical amplifier 70 in the optical resonator, and the second wavelength generated in the excited semiconductor optical amplifier 70 is Light is wavelength-selected by the wavelength selecting element 73 similar to the wavelength selecting element 28, 56, or 60.
- the laser light of the second wavelength ⁇ 2 is selectively amplified by the pair of optical feedback elements 72 and the wavelength selecting element 73 functioning as an optical feedback element or an optical resonator, and further amplified.
- intensity by input light I in which is the modulation is output after being modulated reversed.
- control light I e is input to one end face of the semiconductor optical amplifier device 71 in the next stage of the excited state, the amplified wavelength lambda 2 of the output light output from the semiconductor optical amplifier device 7 1. its wavelength
- the light of the wavelength ⁇ 3 selected by the wavelength selection element 83 becomes a pair of optical feedback elements 82 and 82 functioning as an optical resonator.
- the light is selectively amplified by the wavelength selection element 83 and further amplified. Is modulated by the control light I c having the wavelength ⁇ 2.
- FIG. 17 shows the optical function device of this embodiment.
- 16 5 is a time chart for explaining the operation of the device, including input light I in , control light, and output light I.
- the waveform of ul is shown. From Figure 17, the output light I. It can be seen that ul is on-off controlled by the control light.
- the refractive index periodically changes in a part of the waveguide, for example, in the surface in the waveguide direction.
- Any structure may be used as long as it is made of any one of a grating filter formed, a multilayer filter formed by laminating a plurality of sets of layers having different refractive indexes, a light absorbing material, and a photonic crystal having a photonic band gap.
- the refractive index of a part of the waveguide for example, the surface is periodically changed.
- Grating filter a multilayer filter formed by laminating a large number of layers having different refractive indexes, a photonic crystal having a photonic band gap, and a reflection suppressing film that reflects a part of light. Good.
- the modulated second input light L 2 having a wavelength lambda 2 is the wavelength lambda, although the first input light has been made in continuous light, conversely, the wavelength lambda 2
- the second output light L 2 may be continuous light, and the first input light L 2 having the wavelength ⁇ may be modulated and input.
- the semiconductor optical amplifiers 48 and 50 are formed of the common compound semiconductor substrate 62, but may be formed of separate substrates.
- An optical feedback circuit for returning a part of ut to the input side may be configured by an optical fiber or the like.
- the optical fiber corresponds to the positive feedback element.
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/381,890 US7064891B2 (en) | 2001-04-19 | 2002-04-01 | Optical wavelength converter with a semiconductor optical amplifier |
EP02708752A EP1380881A4 (en) | 2001-04-19 | 2002-04-01 | OPTICAL FUNCTIONAL ELEMENT AND OPTICAL OPTICAL DEVICE |
JP2002584080A JP4485745B2 (ja) | 2001-04-19 | 2002-04-01 | 光機能素子および光機能装置 |
Applications Claiming Priority (2)
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JP2001120758 | 2001-04-19 | ||
JP2001-120758 | 2001-04-19 |
Publications (1)
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WO2002086616A1 true WO2002086616A1 (fr) | 2002-10-31 |
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PCT/JP2002/003274 WO2002086616A1 (fr) | 2001-04-19 | 2002-04-01 | Element fonctionnel optique et dispositif optionnel optique |
Country Status (4)
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US (1) | US7064891B2 (ja) |
EP (1) | EP1380881A4 (ja) |
JP (1) | JP4485745B2 (ja) |
WO (1) | WO2002086616A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006006249A1 (ja) | 2004-07-12 | 2006-01-19 | Optotriode Co., Ltd. | 光信号増幅装置 |
WO2006011262A1 (ja) * | 2004-07-30 | 2006-02-02 | Nihon Yamamura Glass Co., Ltd. | 光信号増幅3端子装置 |
WO2009022623A1 (ja) * | 2007-08-10 | 2009-02-19 | Optotriode Co., Ltd. | 光信号増幅装置 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US7154665B2 (en) * | 2003-08-11 | 2006-12-26 | Lucent Technologies Inc. | Optical performance monitoring using a semiconductor optical amplifier |
JP2005064051A (ja) * | 2003-08-14 | 2005-03-10 | Fibest Ltd | 光モジュールおよび光通信システム |
KR101181446B1 (ko) * | 2008-11-28 | 2012-09-19 | 한국전자통신연구원 | 광도파로 및 양방향 광송수신 장치 |
US8594469B2 (en) * | 2008-12-22 | 2013-11-26 | Electronics And Telecommunications Research Institute | Optical amplifier |
JP2010232424A (ja) * | 2009-03-27 | 2010-10-14 | Fujitsu Ltd | 半導体光増幅装置及び光モジュール |
KR20200030633A (ko) * | 2012-07-31 | 2020-03-20 | 가부시키가이샤 니콘 | 레이저 장치, 그 레이저 장치를 구비한 노광 장치 및 검사 장치 |
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US5539760A (en) | 1993-09-09 | 1996-07-23 | France Telecom Etablissement Autonome De Droit Public | Process for the transposition of an optical modulation of one wavelength to another adjustable wavelength |
JPH09304801A (ja) * | 1996-05-16 | 1997-11-28 | Nippon Telegr & Teleph Corp <Ntt> | 光波長変換装置 |
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FR2753285B1 (fr) * | 1996-09-06 | 1998-10-09 | Alsthom Cge Alcatel | Amplificateur optique a semi conducteur |
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US20020176152A1 (en) * | 2001-05-04 | 2002-11-28 | Paola Parolari | Intensity modulation of optical signals |
US6480316B1 (en) * | 2001-06-15 | 2002-11-12 | Yotta Networks | System and method for reading data content out of optical data stream without altering the optical data stream |
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- 2002-04-01 EP EP02708752A patent/EP1380881A4/en not_active Withdrawn
- 2002-04-01 WO PCT/JP2002/003274 patent/WO2002086616A1/ja active Application Filing
- 2002-04-01 US US10/381,890 patent/US7064891B2/en not_active Expired - Fee Related
- 2002-04-01 JP JP2002584080A patent/JP4485745B2/ja not_active Expired - Fee Related
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006006249A1 (ja) | 2004-07-12 | 2006-01-19 | Optotriode Co., Ltd. | 光信号増幅装置 |
US7130109B2 (en) | 2004-07-12 | 2006-10-31 | Optotriode Co., Ltd. | Optical signal amplification device |
WO2006011262A1 (ja) * | 2004-07-30 | 2006-02-02 | Nihon Yamamura Glass Co., Ltd. | 光信号増幅3端子装置 |
JPWO2006011262A1 (ja) * | 2004-07-30 | 2008-05-01 | 日本山村硝子株式会社 | 光信号増幅3端子装置 |
US7688502B2 (en) | 2004-07-30 | 2010-03-30 | Yoshinobu Maeda | Three-terminal optical signal amplifying device |
WO2009022623A1 (ja) * | 2007-08-10 | 2009-02-19 | Optotriode Co., Ltd. | 光信号増幅装置 |
JPWO2009022623A1 (ja) * | 2007-08-10 | 2010-11-11 | オプトトライオード株式会社 | 光信号増幅装置 |
Also Published As
Publication number | Publication date |
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US7064891B2 (en) | 2006-06-20 |
JPWO2002086616A1 (ja) | 2004-08-12 |
US20030174393A1 (en) | 2003-09-18 |
EP1380881A1 (en) | 2004-01-14 |
EP1380881A4 (en) | 2006-10-25 |
JP4485745B2 (ja) | 2010-06-23 |
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