WO2001057562A1 - Composant optique et appareil optique le comprenant - Google Patents

Composant optique et appareil optique le comprenant Download PDF

Info

Publication number
WO2001057562A1
WO2001057562A1 PCT/JP2001/000624 JP0100624W WO0157562A1 WO 2001057562 A1 WO2001057562 A1 WO 2001057562A1 JP 0100624 W JP0100624 W JP 0100624W WO 0157562 A1 WO0157562 A1 WO 0157562A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
layers
optical
multilayer film
hereinafter
Prior art date
Application number
PCT/JP2001/000624
Other languages
English (en)
Japanese (ja)
Inventor
Kazuro Kikuchi
Yuichi Takushima
Mark Kenneth Jablonski
Yuichi Tanaka
Haruki Kataoka
Noboru Higashi
Kenji Furuki
Original Assignee
Oyokoden Lab Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oyokoden Lab Co., Ltd. filed Critical Oyokoden Lab Co., Ltd.
Priority to AU2001230530A priority Critical patent/AU2001230530A1/en
Publication of WO2001057562A1 publication Critical patent/WO2001057562A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/28—Interference filters
    • G02B5/285—Interference filters comprising deposited thin solid films
    • G02B5/288—Interference filters comprising deposited thin solid films comprising at least one thin film resonant cavity, e.g. in bandpass filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
    • G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
    • G02B6/29362—Serial cascade of filters or filtering operations, e.g. for a large number of channels
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
    • G02B6/29392—Controlling dispersion
    • G02B6/29394—Compensating wavelength dispersion
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
    • G02B2207/117—Adjustment of the optical path length

Definitions

  • the present invention relates to an element capable of compensating for tertiary chromatic dispersion (hereinafter, also simply referred to as dispersion) generated in optical communication using an optical fiber for a transmission line (hereinafter, an element capable of changing tertiary dispersion, or
  • the present invention relates to an optical component having a chromatic dispersion compensating element, which is also simply referred to as a dispersion compensating element, and an optical device using the same.
  • the third-order dispersion compensator itself is also included in the optical component having the third-order dispersion compensator.
  • Fig. 8 is a diagram illustrating the dispersion versus wavelength characteristics of a single-mode optical fiber (hereinafter, also referred to as SMF), a dispersion compensating fiber, and a dispersion shift fiber (hereinafter, also referred to as DSF).
  • SMF single-mode optical fiber
  • DSF dispersion shift fiber
  • reference numeral 8001 is a graph showing the dispersion-wavelength characteristic of the SMF
  • 8002 is a graph showing the dispersion-wavelength characteristic of the dispersion compensating fiber
  • 803 is a graph showing the dispersion-wavelength characteristic of 0 SF.
  • the vertical axis is dispersion and the horizontal axis is wavelength.
  • the dispersion increases as the wavelength of the light input to the fiber increases from 1.3 ⁇ m to 1.8 ⁇ m. Dispersion decreases with increasing length from 1.3 111 to 1.8 ⁇ m. In the DSF, the dispersion decreases as the wavelength of the input light increases from 1.2 / ⁇ 1 to around 1.55 ⁇ , and the wavelength shifts from around 1.55 ⁇ to 1.8 ⁇ . As the length increases, the variance increases.
  • the DSF has the characteristic that the dispersion is almost constant with changes in wavelength when the wavelength of the input light is around 1.55 ⁇ m.
  • Fig. 7 is a diagram explaining the method of compensating for the second-order chromatic dispersion.
  • (A) shows the wavelength-time characteristic
  • (B) shows the second-order chromatic dispersion compensation using SMF and dispersion compensating fiber.
  • (C) is a diagram for explaining an example of a transmission line using only SMF.
  • reference numerals 70 1 and 71 1 denote graphs showing the characteristics of signal light before being input to the transmission line
  • 730 denotes a transmission line constituted by SMF 731
  • 70 2 and 71 2 is a graph showing the characteristics of the signal light output from the transmission path 7 330
  • 7 2 0 is a transmission path composed of the dispersion compensating fiber 7 2 1 and SMF 7 2 2
  • 7 0 3 and 7 13 are transmission 26 is a graph showing the characteristics of the signal light output from the path 720.
  • Reference numerals 704 and 714 are graphs showing characteristics of the signal light when the signal light is subjected to a desirable third-order dispersion compensation described later according to the present invention described later. Almost matches 1 1.
  • Graphs 71, 702, 703, and 704 are graphs with the vertical axis representing wavelength and the horizontal axis representing time (or time), respectively.
  • Graphs 711, 712, 71 3, 7 and 14 are graphs with the vertical axis representing light intensity and the horizontal axis representing time (or time).
  • Reference numerals 724 and 732 are transmitters, and reference numerals 725 and 735 are receivers.
  • the conventional SMF increases the dispersion as the wavelength of the signal light increases from 1.3 m to 1.8 m. This causes a speed delay.
  • the signal light with a wavelength of around 1.55 ⁇ m has a longer delay on the long wavelength side than on the short wavelength side during transmission.
  • 7 1 2 For example, in high-speed long-distance transmission, the signal light that has changed in this way may not be able to be received as an accurate signal because it overlaps the preceding and following signal lights.
  • dispersion is compensated using a dispersion compensating fiber as shown in Fig. 7 (B).
  • the conventional dispersion compensating fiber solves the problem of SMF in which the dispersion increases as the wavelength increases from 1.3 ⁇ to 1.8 / im.
  • the dispersion is designed to decrease as ⁇ increases to 1.8 ⁇ m.
  • the dispersion compensating fiber can be used by connecting the dispersion compensating fiber 721 to the SMF 722, for example, as shown by a transmission line 720 in FIG.
  • the signal light having a wavelength of about 1.55 / zm is greatly delayed on the long wavelength side as compared with the short wavelength side in the SMF 722, and is transmitted in the dispersion compensation fiber 721, for example. Since the short wavelength side is delayed more than the long wavelength side, the degree of the change can be suppressed more than the changes shown in the graphs 702 and 712 as shown in the graphs 703 and 713.
  • the chromatic dispersion of the signal light transmitted through the transmission line is represented by the state of the signal light before being input to the transmission line.
  • Dispersion compensation cannot be performed up to the shape of 1 and the limit is to compensate up to the shape of graph 703.
  • the center of the wavelength of the signal light is not delayed as compared with the short wavelength side and the long wavelength side, and only the short wavelength side and the long wavelength side of the signal light are delayed. Then, a ripple may occur as shown in the graph 713.
  • a dielectric multilayer film proposed by the present inventors has the following three-dimensional structure. We succeeded in compensating for chromatic dispersion, and were able to make significant progress in conventional optical communication technology (Japanese Patent Application No. 11-34-64-44). However, for further development of optical communication technology, it is desirable to further improve the characteristics of the third-order dispersion compensating element such as the dielectric multilayer film. Further improvements are expected.
  • the present invention has been made in view of such a point, and an object of the present invention is to use a dielectric or other multilayer film element having a good group velocity delay-one wavelength characteristic which has not been obtained conventionally.
  • an optical component configured to perform third-order or higher chromatic dispersion compensation and an optical device using the same. Disclosure of the invention
  • the optical component and the optical device of the present invention are characterized by using a third-order chromatic dispersion compensating element.
  • the optical component and the optical device of the present invention use the center wavelength of the incident light as the optical path length for the light having the center wavelength of the incident light (hereinafter, also simply referred to as the optical path length).
  • An element having a multilayer film formed so that the multilayer film has at least four light reflection layers (hereinafter, also simply referred to as a reflection layer) with respect to incident light is referred to as a third-order wavelength dispersion compensation element. It is characterized by using
  • a multilayer film composed of at least seven layers, and a multilayer film composed of the at least seven layers is sometimes collectively referred to as a multilayer film, unless otherwise required.
  • seven or nine layers are configured so that reflective layers and light transmissive layers (hereinafter, also simply referred to as transmissive layers) are alternately formed.
  • transmissive layers In the case of the seven layers, four reflective layers and three transmissive layers are formed, and in the case of the nine layers, five reflective layers and four transmissive layers are formed.
  • each interval is configured such that at least adjacent intervals are not equal, and particularly preferably, all intervals are equal. It is characterized by not being configured.
  • the third-order dispersion compensating element of the present invention is characterized by having three or four cavities having different resonance (resonance) wavelengths.
  • the seven-layered multilayer film is formed by sequentially ordering the seven layers from a first layer, a second layer, a third layer, a fourth layer, a fifth layer, and a sixth layer from one side in the thickness direction of the multilayer film.
  • the reflection layers are referred to as a first layer, a third layer, a fifth layer, and a seventh layer, and their reflectivities are R1, R3, R5, and R7, respectively, R1 ⁇ R 3 ⁇ R 5 ⁇ R 7, and the nine-layered multilayer film is a first layer, a second layer, and a third layer in order from one side in the thickness direction of the multilayer film.
  • R 1, R 3, R 5, R 7, and R 9 denote the reflectivity, respectively, so that R 1 ⁇ R 3 ⁇ R 5 ⁇ R 7 ⁇ R 9 It is a feature.
  • the substrate When the seven-layer or nine-layer multilayer film is formed on the substrate, the substrate may be on the first layer side, and the substrate may be on the seventh or ninth layer side. good.
  • a substrate may be provided on one side of the seven-layer or nine-layer multilayer film, and a layer different from the multilayer film, for example, an antireflection film or a protective layer may be formed on the other side.
  • the multilayer film has a film thickness of 1/4 times L and a higher refractive index (layer H) and a film thickness of 1 / ⁇ .
  • the multilayer film is composed of a plurality of layers each including a layer (layer L) having a lower refractive index of 4 times, and the multilayer film is formed in order from one side in the thickness direction of the multilayer film.
  • a layer composed of three sets of layers (hereinafter also referred to as LH layers or LH films) that are combined in order, Layer L and Layer L Layer composed of 32 sets of combined layers (hereinafter also referred to as LL layer or LL film), composed of 1 layer H and 5 sets of LH layers Layers composed of 43 sets of LL layers, 1 layer H and 8 sets of LH layers, and 18 layers of LL layers And a multi-layered film formed by each layer of a layer constituted by laminating one layer H and 15 sets of LH layers.
  • the multilayer film is formed by laminating two sets of LH layers in order from one side in the thickness direction of the multilayer film.
  • Layer composed of 54 sets of LL layers, layer composed of 1 layer H and 3 sets of LH layers, and 70 sets of LL layers laminated A layer composed of one layer H and five sets of LH layers, a layer composed of 57 sets of LL layers, and one layer H Layers composed of 7 sets of layers and LH layers, layers composed of 47 sets of LL layers, 1 layer H and 15 sets of LH layers
  • the multilayer film has a film thickness, which is considered to be the center wavelength of incident light and the optical path length for incident light, is 1 / It is characterized in that it is composed of a number of layers that are four times as many as unit layers.
  • Each reflective layer has a thickness of 1/4 wavelength and relatively high reflectivity (layer H), and a thickness of 1/4 wavelength and relatively low reflectivity (layer H). It is characterized by being composed of a multilayer film by a combination of the above.
  • the third-order dispersion compensation device of the present invention is primarily, S i (silicon), G e (Germa - ⁇ beam), T i 0 2 (titanium dioxide ), T a 2 0 5 (tantalum pentoxide), one or both of the layer formed by the N b 2 O s (niobium pentoxide) of any layer and S io formed by 2 (silicon dioxide) It is characterized by having a multilayer film composed of a combination of the following.
  • the layer H is mainly is, the layer L is characterized by being formed by a layer consisting of S i ⁇ 2 as the main.
  • FIG. 1 is a diagram illustrating a three-cavity one-dimensional chromatic dispersion compensator according to the present invention.
  • FIG. 2 is a diagram illustrating a 4-cavity tertiary chromatic dispersion compensator according to the present invention.
  • FIG. 3 is a view for explaining a three-cavity-dielectric multilayer tertiary chromatic dispersion compensating element as one embodiment of the present invention.
  • FIG. 4 is a diagram showing a group velocity delay time-wavelength characteristic of the third-order chromatic dispersion compensator of FIG.
  • FIG. 5 is a view for explaining a four-cavity-dielectric multilayer tertiary chromatic dispersion compensating element as one embodiment of the present invention.
  • FIG. 6 is a diagram showing a group velocity delay time-wavelength characteristic of the third-order chromatic dispersion compensator of FIG.
  • FIG. 7 is a diagram explaining the chromatic dispersion compensation method.
  • A shows the wavelength-time characteristic
  • B shows the second-order chromatic dispersion compensation using a dispersion compensation fiber
  • C shows the single mode optical fiber.
  • FIG. 3 is a diagram illustrating a transmission path.
  • FIG. 8 is a diagram illustrating dispersion-wavelength characteristic curves of various fibers. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a diagram illustrating an example of a multilayer film used for a third-order dispersion compensating element of the present invention using a model.
  • reference numeral 100 denotes a multilayer film
  • 101, 102, and 103 denote a reflective layer having a reflectance of less than 100% (hereinafter also referred to as a reflective film)
  • 104 denotes a reflectance.
  • about 100% is a reflective layer
  • 105, 106, and 107 are transmissive layers
  • 111, 112, and 113 are cavities.
  • the reflectance R (101), R of each of the reflective layers 101, 102, 103, 104 in Fig. 1 (1 0 2), R (1 0 3), R (1 0 4) are R (1 0 1) ⁇ R (1 0 2) ⁇ R
  • the reflectance of each reflective layer is formed so as to gradually increase in the thickness direction of the multilayer film 100. Then, the conditions for forming each reflective layer are selected so that the intervals when considered as the optical path length between each reflective layer are different from each other. By doing so, the design accuracy of the reflectance of each reflective layer can be relaxed, and a multilayer film used in the tertiary dispersion compensating element of the present invention is formed by combining a unit film having a thickness of a quarter wavelength. Thus, a third-order dispersion compensator with high reliability and low manufacturing cost can be provided at low cost.
  • FIG. 2 is a diagram illustrating an example of a multilayer film used for the third-order dispersion compensating element of the present invention using a model.
  • reference numeral 200 denotes a multilayer film
  • 201, 202, 203, 204 a reflection layer having a reflectance of less than 100%
  • 205 a reflectance of about 10%.
  • 206, 207, 208, and 209 are transmissive layers
  • 211, 212, 213, and 214 are cavities.
  • the reflectance R (201), R (202), R (203), R of each reflective layer 201, 202, 203, 204, 205 in FIG. (2 0 4), R (2 0 5) is the relation of R (2 0 1) ⁇ R (2 0 2) ⁇ R (2 0 3) ⁇ R (2 0 4) ⁇ R (2 0 5) It is in. That is, the reflective layers are formed so that the reflectivity of each reflective layer sequentially increases in the thickness direction of the multilayer film 200. The conditions for forming each reflective layer are selected so that the intervals when considered as the optical path length between each reflective layer are different from each other.
  • a third-order dispersion compensating element that can be formed has high reliability, and is inexpensive to manufacture can be provided at low cost.
  • the loss (insertion loss) on the signal light when the dispersion generated in the signal light is compensated by the dispersion compensating element using the multilayer film of the present invention is extremely small, which is a very great advantage in practical use. is there.
  • FIG. 3 is a diagram for explaining a dielectric multilayer film used in an example of the present invention.
  • a dielectric multilayer film as a three-cavity-first-order chromatic dispersion compensating element as one embodiment of the present invention will be described with reference to FIG.
  • reference numeral 300 denotes a dielectric multilayer film
  • reference numeral 301 denotes BK-7 (glass) as a substrate for forming the dielectric multilayer film
  • reference numeral 300 denotes a first reflective layer which is an LH layer.
  • 304 is a second reflective layer having one layer H and below it (that is, means the substrate 301 side of the one layer H).
  • LH layers are formed by laminating 5 sets
  • 303 is a third reflective layer consisting of 1 layer H and 8 sets of LH layers beneath it.
  • Reference numeral 302 denotes a fourth reflection layer, which is formed by laminating one layer H and 15 sets of LH layers below the layer H.
  • Reference numeral 308 denotes a first transmission layer formed by stacking 32 sets of LL layers
  • reference numeral 307 denotes a second transmission layer formed by stacking 43 sets of LL layers
  • Reference numeral 306 denotes a third transmission layer, which is formed by laminating 18 sets of LL layers.
  • Reference numeral 320 denotes an arrow indicating the direction of light incident on the dielectric multilayer film 300
  • reference numeral 330 denotes an arrow indicating the direction of light emitted from the dielectric multilayer film 300.
  • Reference numeral 311 denotes a first cavity (resonator) between the first reflection layer 304 and the second reflection layer 304
  • 312 denotes a second reflection layer 304.
  • the above-mentioned LH layer is composed of a layer L formed of a film formed by ion-assist deposition of SiO 2 having a quarter wavelength thickness (hereinafter also referred to as an ion-assist film), and a quarter-wave thickness layer.
  • T i ⁇ are composed of a layer H formed by two Ion'ashisu DOO film, the S i O 2 of Ion'ashisu bets film (the layers) 1 layer and T i 0 2 Ion'ashisu preparative layer (layer H)
  • One combined layer is referred to as one set of LH layers.
  • “stacking three sets of LH layers” means “layer L, layer H, layer L, layer H, layer L, layer Each layer is formed by layering one by one in the order of H. "
  • layers of the LL is called the thickness was formed overlapping two layers L which is composed of Ion'ashisu preparative layer of S i ⁇ 2 quarter wavelengths layer substantially one set of LL. Therefore, for example, “stacking 32 sets of LL layers” means “formed by stacking 64 layers L”.
  • the thickness of each of the first, second, third, and fourth reflective layers is 64 times, 11 times, 4 times, 17 times, 4 times, and 3 times, respectively.
  • the thicknesses of the second, third and third transmission layers are 644 times, 864 times, and 364 times, respectively.
  • the reflectivity of the first, second, third, and fourth reflection layers increases in the order of the first, second, third, and fourth reflection layers, and is 52.4% and 95.3%, respectively. , 99.5% and 100%. It is preferable that each of the above reflectivities be within 3% of the above values. Furthermore, in order to quantitatively provide an excellent dispersion compensating element having characteristics as shown in FIG. 4 described below, the reflectance of the first reflective layer must be 50.0% or more and 68.0 or more. % Or less, the reflectance of the second reflective layer is 92.0% or more and 99.0% or less, the reflectance of the third reflective layer is 99.0% or more and 99.8% or less, It is preferable that the reflectivity of the fourth reflective layer be 99.8% or more.
  • FIG. 4 shows the incident light of the tertiary dispersion compensating element using the dielectric multilayer film of FIG. 3 when the incident light incident from the direction of arrow 320 exits in the direction of arrow 330.
  • the center wavelength on the horizontal axis is 1550 nm, and the maximum group velocity delay time is 7.2 ps (picoseconds).
  • the bandwidth as a third-order dispersion compensating element is about 2 nm.
  • the group velocity delay time of each wavelength of the reflected light obtained by the resonance can be changed by adjusting the thickness of each layer, and the incident angle of the incident light with respect to the dielectric multilayer film 300 Adjustment is also possible by changing.
  • reference numeral 500 denotes a dielectric multilayer film
  • 501 denotes BK-7 (glass) as a substrate on which the dielectric multilayer film is formed
  • 506 denotes a first reflection layer and an LH layer
  • 505 is a second reflective layer and one layer H and a layer below it (that is, the one layer H means the substrate 501 side).
  • 504 is a third reflective layer composed of one layer H and five sets of LH layers below it.
  • 503 is the fourth reflective layer
  • layer H is 1
  • the layer is formed by laminating 7 sets of LH layers below the layer
  • 502 is a fifth reflective layer consisting of 1 layer H and 15 sets of LH layers below it.
  • Reference numeral 510 denotes a first transmission layer formed by laminating 54 sets of LL layers
  • 509 denotes a second transmission layer formed by laminating 70 sets of LL layers
  • 508 is a third transmission layer formed by stacking 57 sets of LL layers
  • 507 is a fourth transmission layer formed by stacking 47 sets of LL layers.
  • Reference numeral 5200 denotes an arrow indicating the direction of light incident on the dielectric multilayer film 500
  • reference numeral 5300 indicates an arrow indicating the direction of light emitted from the dielectric multilayer film 500.
  • Reference numeral 511 denotes a first cavity (resonator) between the first reflective layer 506 and the second reflective layer 505, and 512 denotes a second cavity between the first reflective layer 506 and the second reflective layer 505.
  • a second cavity between the third reflective layer 504, 513 is a third cavity between the third reflective layer 504 and the fourth reflective layer 53, 514 is A fourth cavity between the fourth reflective layer 503 and the fifth reflective layer 502.
  • a layer L which thickness is formed with a film created by S i ⁇ second ion Assis Bok deposition of a quarter wavelength, the thickness is 1 wavelength quarter T i are composed of a layer H formed in ⁇ 2 Lee On'ashisu DOO film, the S i ⁇ second i On'ashisu preparative layer (layer L) 1 layer and T i 0 2 Ion'ashisu preparative layer (layer H )
  • One combined layer is called one set of LH layers.
  • “three sets of LH layers are stacked” means “layer L 'layer ⁇ layer L' layer ⁇ layer L 'layer Each layer is formed one by one in the order of H.
  • layers of the LL is called the thickness was formed overlapping two layers L which is composed of Ion'ashisu preparative layer of S i ⁇ 2 quarter wavelengths layer substantially one set of LL. Therefore, for example, “laminated with 54 sets of LL layers” means “formed by laminating 108 layers L”.
  • the thicknesses of the first, second, third, fourth, and fifth reflective layers are 4 times, 4 times, 7 times, 4 times, 1 1 Z 4 times, 15 4 times, 3 1 4 times, respectively.
  • the thickness of each of the first, second, third, and fourth transmission layers is 1084 times, 1400 times, 114 times 4 times, 9 times 4 times, respectively. It is.
  • the reflectance of each of the first, second, third, fourth, and fifth reflective layers is first, second, third, fourth, Larger in the order of the fifth reflective layer, 24.8%, 81.0%, 95.3 ° /, respectively. , 98.9%, 100%.
  • each of the above reflectivities be within 3% of the above values.
  • the reflectance of the first reflective layer should be 23.0 to 35.0%, The reflectivity of the layer is 75.0 to 91.0%, the reflectivity of the third reflective layer is 92.0 to 98.5%, and the reflectivity of the fourth reflective layer is 98.5 to It is preferable that the reflectivity of the fifth reflective layer be 99.3% or more.
  • FIG. 6 shows the incident light of the incident light that enters the third-order dispersion compensating element using the dielectric multilayer film of FIG. 5 from the direction of arrow 520 and exits in the direction of arrow 530.
  • the center wavelength on the horizontal axis is 1550 nm, and the maximum group velocity delay time is 9.6 ps (pyrosecond).
  • the bandwidth as a third-order dispersion compensator is about 2 nm.
  • an ion assist film is used for a multilayer film.
  • a film is formed by ion assist deposition, a durable and uniform film can be formed, and the quality of the film can be improved.
  • the present invention is not limited to ion-assist deposition, and the present invention is not limited to the use of multi-layer films formed by vapor deposition, sputtering, ion plating, and other methods that are widely used. It has an effect.
  • the layer H is mainly formed of T i ⁇ 2 (titanium dioxide) has been described.
  • the main components of the layer H are not limited to this, and Si (silicon), G e (germanium), T a 2 ⁇ 5 (tantalum pentoxide), it may be formed by N b 2 0 5 (niobium pentoxide). These materials are tertiary dispersed in consideration of their physical properties. It is selected and used so as to meet the specifications of the compensating element.
  • This embodiment is characterized in that the lamination of a thick film as in the present embodiment is easy, and the amorphous state containing a lot of fine crystals tends to be formed, and the production yield of a multilayer film is improved.
  • this instead of the LL layer S i, G e, T i OT a 2 ⁇ 5, N bz O s may also be used HH layer formed of any applied becomes layers.
  • the HH layer has advantages such as high film thickness detection accuracy with a film thickness monitor and strong stress.
  • the third-order dispersion compensating element using the multilayer film of the present invention can sufficiently compensate for the third-order or higher dispersion.
  • the characteristics of the signal light transmitted to the characteristics shown by the graphs 704 and 714 can be improved.
  • the multilayer film constituting the optical component and the optical device according to the present invention can realize a group velocity delay time-wavelength characteristic that is extremely preferable as a third-order dispersion compensating element.
  • this technology By applying this technology to high-speed long-distance communication systems using fibers, it is possible to compensate for third-order dispersion more accurately and with extremely low loss.
  • Optical communication can be realized at a practical cost.
  • many devices, facilities, and technologies constructed using conventional optical communication systems of less than OG bps can be used. It can also be used in high-speed communication at 0 Gbps or higher, and the economic effect of the present invention is enormous.
  • An optical component according to the present invention and an optical device using the same are indispensable for practical use of high-speed and long-distance optical communication such as transmitting 100,000 km at 40 Gbps.
  • the present invention greatly contributes to the development of the optical communication field.
  • optical component of the present invention having an excellent group velocity delay-one wavelength characteristic using a special multilayer film as described above in an optical communication system as a third-order optical dispersion compensating element, conventional dispersion compensation can be performed. Only the third-order chromatic dispersion that could not be compensated Can be compensated with extremely low loss, and high-speed and long-distance optical communication can be realized without replacing existing communication equipment such as optical fibers with new ones. The economic effect is enormous.
  • the optical component having a function as an optical dispersion compensator using a special multilayer film according to the present invention is small, suitable for mass production, and can be provided at a low price. The contribution to development is extremely large.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Optical Communication System (AREA)

Abstract

Selon cette invention, dans un système de communication optique utilisant des fibres optiques, on suppose qu'un procédé classique de compensation de dispersion de longueurs d'ondes ne peut assurer une communication correcte, en raison de l'augmentation du débit binaire des communications et de la distance de communication; par conséquent, la compensation de dispersion des longueurs d'ondes tertiaires ou d'ordre élevé est nécessaire. Cependant, aucune contre-mesure n'a été proposée pour la compensation de dispersion de longueurs d'ondes tertiaires. En outre, on utilise un film multicouche (300) constitué au moins par quatre couches réfléchissantes (305, 304, 303, 302) dont la réflectance augmente séquentiellement du côté incident du signal lumineux, comme élément de compensation de dispersion de longueurs d'ondes tertiaires afin de compenser la dispersion des longueurs d'ondes tertiaires en créant un retard de vitesse de groupe dans le signal lumineux. On fait en sorte que l'épaisseur du film multicouche correspondant à la longueur du trajet optique soit égale à un multiple entier du quart de la longueur d'onde.
PCT/JP2001/000624 2000-02-02 2001-01-31 Composant optique et appareil optique le comprenant WO2001057562A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001230530A AU2001230530A1 (en) 2000-02-02 2001-01-31 Optical component and optical apparatus comprising it

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000-24922 2000-02-02
JP2000024922 2000-02-02

Publications (1)

Publication Number Publication Date
WO2001057562A1 true WO2001057562A1 (fr) 2001-08-09

Family

ID=18550849

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/000624 WO2001057562A1 (fr) 2000-02-02 2001-01-31 Composant optique et appareil optique le comprenant

Country Status (2)

Country Link
AU (1) AU2001230530A1 (fr)
WO (1) WO2001057562A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6318304A (ja) * 1986-07-11 1988-01-26 Matsushita Electric Ind Co Ltd ２波長分離用バンドパスフイルタ−
JP2754214B2 (ja) * 1988-07-12 1998-05-20 工業技術院長 光パルスの周波数チャープ補償が出来る誘電体多層膜
JPH11218628A (ja) * 1998-02-04 1999-08-10 Hitachi Ltd 光分散補償素子および該素子を用いた半導体レーザ装置ならびに光通信システム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6318304A (ja) * 1986-07-11 1988-01-26 Matsushita Electric Ind Co Ltd ２波長分離用バンドパスフイルタ−
JP2754214B2 (ja) * 1988-07-12 1998-05-20 工業技術院長 光パルスの周波数チャープ補償が出来る誘電体多層膜
JPH11218628A (ja) * 1998-02-04 1999-08-10 Hitachi Ltd 光分散補償素子および該素子を用いた半導体レーザ装置ならびに光通信システム

Also Published As

Publication number Publication date
AU2001230530A1 (en) 2001-08-14

Similar Documents

Publication Publication Date Title
JP2002311235A (ja) 複合型の光分散補償素子とその素子を用いた光分散補償方法
WO2001086328A1 (fr) Composant optique et procede de compensation de dispersion
JP2002267834A (ja) 光学部品およびその部品を用いた光分散補償器ならびに光分散補償方法
JP2001320328A (ja) 光通信方法
JP2018155863A (ja) 光導波路素子及び受信回路
JP2002243935A (ja) 分散補償器
US8456741B2 (en) Optical module having three or more optically transparent layers
JP4613814B2 (ja) 可変分散補償器
JP4639836B2 (ja) 可変分散補償器
JP4497042B2 (ja) 可変分散補償器
WO2016098476A1 (fr) Élément de guide d'ondes optique, dispositif de réception de lumière, dispositif de communication optique, modulateur optique, résonateur optique et procédé permettant de fabriquer un élément de guide d'ondes optique
WO2001057562A1 (fr) Composant optique et appareil optique le comprenant
JP2005236336A (ja) 複合型の光分散補償素子および光分散補償方法
US8818193B2 (en) Multichannel tunable optical dispersion compensator
JP4095866B2 (ja) 波長分散発生装置
JP2002122732A (ja) 光分散補償素子
JP2002214430A (ja) 光分散補償素子
JP2001251246A (ja) 光分散補償素子
WO2001084749A1 (fr) Dispositif de compensation de la dispersion optique, et procede de compensation de la dispersion optique utilisant ledit dispositif
JP2001305339A (ja) 光分散補償素子
JP2001251004A (ja) 光増幅器
WO2001086339A1 (fr) Element de compensation de la dispersion de la lumiere et procede de compensation de la dispersion de la lumiere a l'aide dudit element
WO2001094991A1 (fr) Dispositif composite de compensation de dispersion de la lumiere et procede de compensation de dispersion de la lumiere l'utilisant
JP2001352293A (ja) 光分散補償素子とその素子を用いた光分散補償方法
JP2001305338A (ja) 光分散補償素子

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU CA JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
ENP Entry into the national phase

Ref country code: JP

Ref document number: 2001 556356

Kind code of ref document: A

Format of ref document f/p: F

122 Ep: pct application non-entry in european phase