WO2002021192A1 - Multiplexeur optique polarise - Google Patents

Multiplexeur optique polarise Download PDF

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Publication number
WO2002021192A1
WO2002021192A1 PCT/JP2001/007577 JP0107577W WO0221192A1 WO 2002021192 A1 WO2002021192 A1 WO 2002021192A1 JP 0107577 W JP0107577 W JP 0107577W WO 0221192 A1 WO0221192 A1 WO 0221192A1
Authority
WO
WIPO (PCT)
Prior art keywords
polarization
parallel
birefringent crystal
polarization maintaining
optical fiber
Prior art date
Application number
PCT/JP2001/007577
Other languages
English (en)
Japanese (ja)
Inventor
Yoshihiro Konno
Original Assignee
Namiki Seimitsu Houseki Kabushiki Kaisha
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 Namiki Seimitsu Houseki Kabushiki Kaisha filed Critical Namiki Seimitsu Houseki Kabushiki Kaisha
Publication of WO2002021192A1 publication Critical patent/WO2002021192A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • 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
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
    • G02B6/2713—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations
    • 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
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
    • G02B6/2773—Polarisation splitting or combining
    • 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
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
    • G02B6/3885—Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4202—Packages, e.g. shape, construction, internal or external details for coupling an active element with fibres without intermediate optical elements, e.g. fibres with plane ends, fibres with shaped ends, bundles
    • G02B6/4203—Optical features

Definitions

  • the present invention relates to a polarization combiner for optical fiber amplification mainly used for optical communication and optical measurement, and a polarization separator.
  • optical fiber amplifiers which amplify optical signals with light, have attracted attention and are being used.
  • This optical fiber amplifier has many advantages, such as high gain, low noise, and suitability for wavelength multiplexing, and plays an important role in current optical communication technology.
  • the active layer has a more flat structure, so that the spot shape of the light beam emitted from the semiconductor laser also becomes flat.
  • a special polishing technique is used to process the tip of the optical fiber 102 into a semi-cylindrical shape as shown in Fig. 3.
  • a coupling technology for increasing the optical coupling efficiency with a flat light beam from the semiconductor laser 101 for excitation has already been developed.
  • reference numerals 201a and 201b denote polarization maintaining fibers, and the two polarization maintaining fibers 201a and 201b have polarization planes of light (F1, F2) passing therethrough which are orthogonal to each other.
  • Retention fibers 201a and 201b pass through separate lenses 202a and 202b, respectively, and enter polarization beam splitter 203 as shown.
  • the polarization beam splitter 203 has a multi-stage structure in which a multilayer film is formed on the surface to which the triangular prism is bonded, and is adhered and fixed with an optical organic adhesive. Inside the polarization beam splitter 203, the light (P The wave: F1) is transmitted in the straight direction, and the light (S wave: F2) on the other side of the polarization maintaining fiber 201b has the function of being reflected by the multilayer film surface. Show.
  • the light (P wave: F1) on the polarization maintaining fiber 201a side and the light (S wave: F2) on the polarization maintaining fiber 201b side are synthesized in the polarization beam splitter 203, pass through the lens 202c, and pass through the optical fiber.
  • Light (F3) is propagated to 204.
  • the polarization beam splitter 203 itself has a multi-stage structure in which a large number of triangular prisms are adhered to each other.
  • the adhesive for fixing the triangular prisms is an organic adhesive, so there was a particular problem in reliability.
  • the polarization maintaining fiber 201a and the lens 202a, the polarization maintaining fiber 201b and the lens 202b, and the optical fiber 20 and the lens 202c, which are respectively integrated, are assembled one by one first.
  • a polarizing beam splitter 203 having a structure in which the four triangular prisms are bonded to each other and assemble the light.
  • the present invention solves the above-described problems, and provides a polarization combining structure that can improve light resistance and high reliability, increase optical coupling efficiency, facilitate assembly, and further reduce the size compared to a conventional polarization combining device.
  • the purpose is to: Disclosure of the invention
  • the present invention provides, as a polarization combiner, a two-core filter having a structure in which two polarization maintaining fibers whose polarization maintaining surfaces are orthogonal to each other can be arranged in parallel in an axial direction.
  • the outgoing fiber assembly inserted and fixed inside, and one uniaxial birefringent crystal parallel plate with an optical path length such that two light beams from both polarization maintaining fibers are combined into one.
  • this polarization synthesizer is described in more detail as shown in FIG.
  • light (F1, F2) from the left side of the figure passes through each polarization maintaining fiber 301a and the polarization maintaining fiber 301b, and passes through a two-core ferrule (not shown) having a parallel arrangement structure.
  • the optical path system is housed and configured as an integrated assembly.
  • One end of the optical fibers of the polarization maintaining fibers 301a and 301b is obliquely polished and is provided with an antireflection film in order to improve the return loss performance.
  • Polarization synthesis for the light beam whose two polarization maintaining surfaces are orthogonal to each other is performed by the following parallel plate 302 made of uniaxial birefringent crystal.
  • the uniaxial birefringent crystal parallel flat plate 302 is disposed between the two polarization maintaining fibers and a lens 303a to be described later, and emits two orthogonally polarized light beams emitted from the polarization maintaining fibers 301a and 301b. (F1, F2) passes through the optical path system of the uniaxial birefringent crystal parallel flat plate 302, and is polarized and combined into one light beam.
  • the structure shown in Fig. 1 uses two lenses 303a and 303b for highly efficient optical coupling.
  • either one of the lenses can be optically coupled. It satisfies enough.
  • the new structure without using the conventional triangular prism enables a structure without an adhesive on the optical path, eliminating the risk of light deterioration of the adhesive and improving the reliability over time.
  • the polarization maintaining fibers 301a and 301b are housed in a two-core ferrule with their respective polarization maintaining surfaces perpendicular to each other.Since the two axes of the fiber are structurally integrated with the ferrule, they are made of uniaxial birefringent crystal.
  • the optical beam is monitored by an imager and made of a uniaxial birefringent crystal so that the two light beams become one.
  • the uniaxial birefringent crystal parallel plate 302 After the uniaxial birefringent crystal parallel plate 302, the light passing through the two lenses 303a '303b and the optical fiber 304 can be treated as one light beam. Since one end of each of these optical fibers is obliquely polished to improve the return loss performance, it is not necessary to structurally incline the side of the uniaxial birefringent crystal parallel plate 302. Therefore, the two light beams emitted from the two polarization maintaining fibers 301a '301b and passing through the uniaxial birefringent crystal parallel plate 302 become one light beam so that the uniaxial birefringent crystal parallel plate is used. By setting the thickness (optical path length) of 302, the two light beams are always one, and high efficiency optical coupling can be obtained easily.
  • Equation 1 The equation representing the relationship between the distance between the two light beams on the orthogonal polarization planes and the thickness for obtaining the optical path length of the uniaxial birefringent crystal parallel plate 302 for combining the two light beams into one is:
  • the contents are shown as the explanatory words of the following Equation 1 and symbols.
  • one light beam from a single mode optical fiber is divided into two light beams through a lens.
  • Two cores in which one uniaxial birefringent crystal parallel plate having an optical path length to be separated as a polarization maintaining light beam and two polarization maintaining fibers whose polarization maintaining surfaces are orthogonal to each other are arranged in parallel in the axial direction.
  • the entrance-side fiber assembly which is inserted and fixed in the ferrule, faces
  • the arrangement order is one optical fiber on the entrance side, one or two lenses, one parallel plate made of uniaxial birefringent crystal, and two polarization maintaining fibers on the entrance side fixed to a ferrule.
  • this polarization separator includes a polarization mode dispersion (PMD) (Polarization Mode Dispersion) monitor in the transmission line and coherent optical communication.
  • PMD Polarization Mode Dispersion
  • the uniaxial birefringent crystal rutile (Ti0 2), ortho yttrium Vanadium (YV0 4), can be considered parallel plates of Karusai bets (calcite) selected from the plate.
  • Karusai bets in three calcite is because of the deliquescence, preferably rutile (Ti0 2), ortho yttrium Vanadium (YV0 4) are suitable.
  • FIG. 1 is a schematic diagram showing a configuration of a polarization synthesizer according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing the configuration of a conventional polarization synthesizer.
  • FIG. 3 is a schematic perspective view showing an example of a mode in which a light beam from a semiconductor laser for excitation is efficiently coupled to an optical fiber.
  • FIG. 4 is an example of a two-core ferrule used in the embodiment of the present invention, in which (a) is a cross-sectional view, and (b) is a view schematically showing a hole see through from the front.
  • FIG. 1 is a diagram showing a schematic structure of a polarization synthesizer of the present invention.
  • the 2-core ferrule 401 see Fig. 4
  • the polarization maintaining surfaces are housed in a perpendicular combination, fixed with a glass adhesive, polished diagonally on the tip of the firer to improve the return loss performance, and coated with an anti-reflection film on the processed end surface.
  • the outgoing side firer assembly was used.
  • a laser beam for adjustment is passed through two polarization maintaining fibers 301a and 301b, and a parallel plate 302 made of rutile uniaxial birefringent crystal with a thickness of 1.26 mm is attached.
  • the parallel plate 302 made of uniaxial birefringent crystal is rotated and adjusted so that two light beams passing through the parallel plate 302 made of uniaxial birefringent crystal become one beam.
  • the holding case and the holding case made of a uniaxial birefringent crystal parallel plate were fused and fixed by YAG laser welding.
  • two lenses 303a-303b and an optical fiber 304 are added as the side receiving the light adjusted to one light beam, and the beam axis is adjusted to achieve more efficient optical coupling.
  • the bodies were fused and fixed by YAG laser welding to complete the polarization synthesizer body.
  • a parallel plate made of a small uniaxial birefringent crystal can be used without using a polarization beam splitter that frequently uses a conventional organic adhesive.
  • polarization beam splitter that frequently uses a conventional organic adhesive.
  • each optical fiber of the polarization maintaining fiber is obliquely polished to improve the return loss performance, and the end face is coated with an antireflection film. You don't have to.
  • work such as optical axis adjustment and assembly can be easily performed, and high optical coupling efficiency can be easily obtained.
  • each component in particular, a plurality of prism components constituting the polarizing beam splitter is eliminated, and only one uniaxial birefringent crystal parallel plate is required.
  • a space-saving polarization combiner and polarization separator can be obtained.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

L'invention se rapporte à un multiplexeur optique polarisé comportant un ensemble de fibres côté sortie, inséré et fixé dans une férule à deux noyaux présentant une structure dans laquelle deux fibres à maintien de polarisation possèdent deux plans de maintien de la polarisation perpendiculaires l'un à l'autre et parallèles à la direction axiale, des plaques parallèles fabriquées dans un cristal à double réfraction, uniaxial, dotées d'un chemin optique tel que deux faisceaux lumineux issus des deux fibres à maintien de polarisation sont multiplexés en un seul faisceau, une lentille permettant le multiplexage des faisceaux lumineux sortants, issus des plaques plates parallèles, une autre lentille disposée au niveau de l'extrémité avant de la fibre optique du côté entrant et une autre fibre optique également du côté entrant. L'ordre de disposition de ces composants est le suivant: les deux fibres à maintien de polarisation côté sortant, une plaque plate parallèle composée du cristal à double réfraction uniaxiale, une ou deux lentilles, et une fibre optique côté entrant.
PCT/JP2001/007577 2000-09-04 2001-08-31 Multiplexeur optique polarise WO2002021192A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000267008A JP2002072141A (ja) 2000-09-04 2000-09-04 偏光合成器
JP2000-267008 2000-09-04

Publications (1)

Publication Number Publication Date
WO2002021192A1 true WO2002021192A1 (fr) 2002-03-14

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Family Applications (1)

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PCT/JP2001/007577 WO2002021192A1 (fr) 2000-09-04 2001-08-31 Multiplexeur optique polarise

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JP (1) JP2002072141A (fr)
WO (1) WO2002021192A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6560378B1 (en) * 2001-08-02 2003-05-06 Alliance Fiber Optic Products, Inc. Compact polarization couplers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6558960B2 (ja) * 2015-06-02 2019-08-14 株式会社小野測器 レーザ光合成分岐装置及びレーザ測定装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0886936A (ja) * 1994-09-19 1996-04-02 Oki Electric Ind Co Ltd 偏波合成方法および偏波合成モジュール
EP0959375A2 (fr) * 1998-05-21 1999-11-24 Jds Fitel Inc. Atténuateur optique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0886936A (ja) * 1994-09-19 1996-04-02 Oki Electric Ind Co Ltd 偏波合成方法および偏波合成モジュール
EP0959375A2 (fr) * 1998-05-21 1999-11-24 Jds Fitel Inc. Atténuateur optique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6560378B1 (en) * 2001-08-02 2003-05-06 Alliance Fiber Optic Products, Inc. Compact polarization couplers

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