WO2005069052A1 - Optical cable for optical signal detection and manufacturing method thereof - Google Patents

Optical cable for optical signal detection and manufacturing method thereof Download PDF

Info

Publication number
WO2005069052A1
WO2005069052A1 PCT/KR2004/003244 KR2004003244W WO2005069052A1 WO 2005069052 A1 WO2005069052 A1 WO 2005069052A1 KR 2004003244 W KR2004003244 W KR 2004003244W WO 2005069052 A1 WO2005069052 A1 WO 2005069052A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical cable
optical signal
optical
silicon substrate
clad
Prior art date
Application number
PCT/KR2004/003244
Other languages
French (fr)
Inventor
Jae-Soo Lee
Hyung-Gon Jeong
Yong-Hyun Kim
Dong-Keun Kim
Yong-Moo Lim
Original Assignee
Goldtel 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 Goldtel Co., Ltd. filed Critical Goldtel Co., Ltd.
Publication of WO2005069052A1 publication Critical patent/WO2005069052A1/en

Links

Classifications

    • 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
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2852—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using tapping light guides arranged sidewardly, e.g. in a non-parallel relationship with respect to the bus light guides (light extraction or launching through cladding, with or without surface discontinuities, bent structures)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3822—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving specially adapted for use in vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • B60R11/0217—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for loud-speakers
    • 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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02066—Gratings having a surface relief structure, e.g. repetitive variation in diameter of core or cladding
    • 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
    • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
    • G02B6/3632—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means
    • G02B6/3636—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the mechanical coupling means being grooves
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • 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
    • G02B6/29304—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 diffraction, e.g. grating
    • G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
    • G02B6/29317—Light guides of the optical fibre 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
    • G02B6/26—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
    • G02B6/29304—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 diffraction, e.g. grating
    • G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
    • G02B6/29323—Coupling to or out of the diffractive element through the lateral surface of the light guide
    • 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
    • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
    • G02B6/3648—Supporting carriers of a microbench type, i.e. with micromachined additional mechanical structures
    • G02B6/3652—Supporting carriers of a microbench type, i.e. with micromachined additional mechanical structures the additional structures being prepositioning mounting areas, allowing only movement in one dimension, e.g. grooves, trenches or vias in the microbench surface, i.e. self aligning supporting carriers
    • 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
    • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
    • G02B6/3684—Mechanical coupling means for mounting fibres to supporting carriers characterised by the manufacturing process of surface profiling of the supporting carrier
    • G02B6/3692—Mechanical coupling means for mounting fibres to supporting carriers characterised by the manufacturing process of surface profiling of the supporting carrier with surface micromachining involving etching, e.g. wet or dry etching steps

Definitions

  • the present invention relates, in general, to an optical cable for detecting an optical signal and a method of producing the same and, more particularly, to an optical cable for detecting an optical signal, which is capable of detecting the optical signal using a circumferential surface thereof, and a method of producing the same.
  • an optical cable having a circular section includes a core, a clad, and a jacket, in which the core is an optical fiber made of very thin glass or plastic and having a circular section, the clad surrounds the core to enable an optical signal to be maintained in the core and to provide strength to the core, and the jacket surrounds the clad to protect the core and the clad from being corroded due to moisture and from being worn and damaged due to external interference and external force .
  • the optical cable is not affected by external interference, such as impactive noise or crosstalk, because it transmits the signal in the form of light, data transmissibility is excellent because it has a relatively wide bandwidth in comparison with other wire transmission media, and it is possible to reduce the size of a structure for supporting the optical cable because it has a relatively small size and weight in comparison with other transmission wires .
  • a data transmission speed of an optical cable is about 1 Gbit, and, currently, it is frequently applied to local area networks, wide area networks, long-distance communication, military and subscriber lines .
  • the above conventional optical cable is not provided with any means capable of detecting an optical signal, whether the optical signal is desirably output through an end of the optical cable must be checked using an optical power meter after the end connection part of the optical cable is removed in order to determine if the optical signal is desirably transmitted through the optical cable. Furthermore, when the optical signal is undesirably transmitted through the optical cable, it is necessary to check positions of abnormal portions using a costly optical time domain reflectometer (OTDR) .
  • OTD optical time domain reflectometer
  • it is difficult to rapidly examine the transmission state of the optical signal through the optical cable it is very cumbersome to examine the transmission state of the optical signal and the positions of the abnormal portions, and the above examinations are conducted using a costly optical power meter or optical time domain reflectometer. Thus, the method is very disadvantageous in terms of maintenance and repair. Accordingly, there remains a need to easily examine the transmission state of the optical signal and the positions of the abnormal portions, and various technologies are frequently developed to satisfy the above need.
  • an object of the present invention is to provide an optical cable for detecting an optical signal, which is capable of detecting the optical signal using a circumferential surface thereof, and a method of producing the same.
  • the above object can be accomplished by providing an optical cable for detecting an optical signal according to the present invention.
  • the optical cable comprises a cylindrical core, a clad which surrounds a circumferential surface of the core in a predetermined thickness, and a jacket which surrounds a circumferential surface of the clad in a predetermined thickness.
  • An exposed surface is formed at an external part of the optical cable so that the clad is exposed, a plurality of optical signal detection grooves is longitudinally formed along the optical cable on the exposed surface at regular intervals, and the optical signal detection grooves are sealed with a subsidiary cover which is made of transparent or semi-transparent material having a refractive index that is lower than a refractive index of the clad.
  • a method of producing the above optical cable for detecting the optical signal comprises applying liquid epoxy resin on an upper side of a silicon substrate, which has an optical cable mounting groove with an opened upper part, to a predetermined height; mounting the cylindrical optical cable in the optical cable mounting groove of the silicon substrate, sealing the optical cable using the epoxy resin so that a portion of the optical cable protrudes from the upper side of the silicon substrate, and hardening the epoxy resin through heat treatment to fix the optical cable to the silicon substrate using the epoxy resin; polishing the hardened epoxy resin and the optical cable flat so that a portion of a clad of the optical cable, which protrudes from the upper side of the silicon substrate, is exposed; applying a photoresist on an exposed surface of the optical cable; exposing the photoresist to form a pattern; etching the clad of the optical cable so as to longitudinally form a plurality of optical signal detection grooves along the optical cable at regular intervals; removing the remaining photoresist; removing the hardened epoxy resin by heat treatment to separate the optical cable having
  • FIGS. 1 to 10 illustrate the production of an optical cable for detecting an optical signal according to the present invention
  • FIGS. 11 to 16 illustrate the production of a silicon substrate used in the present invention.
  • FIGS. 1 to 10 illustrate the production of an optical cable for detecting an optical signal according to the present invention, in which FIGS. 1 to 4 and FIG. 8 illustrate front sectional views, and FIGS. 5 to 7 and FIGS. 9 and 10 illustrate side sectional views.
  • An optical cable 300 for detecting an optical signal according to the present invention comprises a cylindrical core 310, a clad 320 which surrounds a circumferential surface of the core 310 in a predetermined thickness, and a jacket 330 which surrounds a circumferential surface of the clad 320 in a predetermined thickness.
  • An exposed surface 321 is formed at an external part of the optical cable so that the clad 320 is exposed, a plurality of optical signal detection grooves 322 is longitudinally formed along the optical cable 300 on the exposed surface 321 at regular intervals, and the optical signal detection grooves 322 are sealed with a subsidiary cover which is made of transparent or semi-transparent material having a refractive index that is lower than the clad 320.
  • a subsidiary cover which is made of transparent or semi-transparent material having a refractive index that is lower than the clad 320.
  • epoxy resin 200 which is not subjected to heat treatment is liquid at room temperature, it is easy to apply liquid epoxy resin 200 on the upper side of the silicon substrate 100 in the predetermined height. 2.
  • Each of the cylindrical optical cables 300 is a known optical cable 300 which comprises a cylindrical core 310, a clad 320 surrounding a circumferential surface of the core 310 in a predetermined thickness, and a jacket 330 surrounding a circumferential surface of the clad 320 in a predetermined thickness. They are used as an object during the production of the optical cable for detecting the optical signal.
  • Epoxy resin 200 acts as an adhesive for strongly attaching the optical cable 300 to the silicon substrate 100, and functions to smoothly conduct a subsequent photoresist 400 coating process. 3.
  • exposed surfaces 321 at which the clads 320 are exposed are shaped into a chord. Meanwhile, sufficient spaces capable of forming optical signal detection grooves 322 therein must be assured between the exposed surfaces 321 and the cores 310, and the silicon substrate 100 must not be damaged by a polisher, in order that the silicon substrate 100 may be reused. 4.
  • the step of applying a photoresist 400 on the exposed surfaces 321 of the optical cables 300 (see FIG.
  • the photoresist 400 Called photosensitive plastic or photosensitive polymer, the photoresist 400 is extensively known already, and a method of coating the photoresist is extensively known. Thus, a detailed description of this step is omitted. 5.
  • the step of exposing the photoresist 400 to form a pattern see FIG. 5) . If light or radioactive rays irradiate the photoresist 400, a structural change occurs only at an irradiated portion. The irradiated portion is immersed in a developing solution to be developed, thereby forming a predetermined pattern.
  • the photoresist 400 is classified into a nega-type in which a portion structurally changed by light or radioactive rays is not dissolved in the developing solution, and a posi-type which is the opposite of the nega-type. Any type may be used in the present invention.
  • the above pattern is formed so that a plurality of optical signal detection grooves 322 is longitudinally formed along the optical cable 300 at regular intervals. 6.
  • the clads 320 are etched using a well known B.O.E (buffered oxide etchant) .
  • epoxy resin 200 which is hardened using a separate heater (not shown) , is directly or indirectly heated, physical properties of hardened epoxy resin 200 are changed, thus it is possible to easily strip epoxy resin 200 having changed physical properties from the silicon substrate 100 and the optical cables 300. Needless to say, it is possible to remove still more epoxy resin 200 having changed physical properties from the silicon substrate 100 and the optical cables 300 using a separate washing process, if necessary. 9.
  • epoxy resin is used as the subsidiary cover 340, and liquid epoxy resin is applied on the optical signal detection grooves 322 and then heat treated so as to be hardened while liquid epoxy resin fills and seals the optical signal detection grooves 322.
  • the silicon substrate 100 having the optical cable mounting grooves 111 may be repeatedly used as a frame for producing the optical cable for detecting the optical signal, and is produced through the following procedure. 1.
  • the step of heat treating a silicon substrate main body 110 to form an oxide layer 120 on a surface thereof see FIG. 11) . If the silicon substrate main body 110 is heat treated, the surface of the silicon substrate main body 110 reacts with oxygen to form the oxide layer (Si02) 120.
  • the silicon substrate main body 110 is put in an electric furnace and then heat treated at high temperatures for a predetermined time to form the oxide layer 120 in a thickness of 1 ⁇ m or less on the upper surface of the silicon substrate main body 110.
  • the step of applying a photoresist 130 on the oxide layer 120 of the silicon substrate main body 110 (see FIG. 12) .
  • the photoresist 130 is applied on the oxide layer 120 in a thickness of 1 ⁇ m or less.
  • the step of exposing the photoresist 130 to form a pattern (see FIG. 13) .
  • the pattern is longitudinally and straightly formed along the silicon substrate main body 110. 4.
  • the step of etching the oxide layer 120 of the silicon substrate main body 110 to form a pattern see FIG.
  • the silicon substrate main body 110 is etched with a KOH/H 2 0 aqueous solution so that the optical cable mounting grooves 111 have triangular sections.
  • the optical cable mounting grooves 111 of the silicon substrate 100 have triangular sections in the present embodiment, but may have semi-circular or polygonal, that is, tetragonal or more, sections, if necessary. Furthermore, it is unnecessary to completely seal the cylindrical optical cables 300 mounted in the optical cable mounting grooves 111 of the silicon substrate 100 using epoxy resin 200 as shown in FIG.
  • a polishing process may be conducted through a multistage process using polishing stones having different roughnesses so as to smooth surfaces of epoxy resin 200 and the optical cables 300 which are to be polished and thus desirably achieve coating of the photoresist 400 (see FIG. 3) .
  • a portion of an optical signal which is dissipated through a clad 320 is introduced to an optical signal detection groove 322 and then output through a subsidiary cover 340, thus it is possible to easily examine in real time whether the optical signal is desirably transmitted using the optical signal which is introduced to the optical signal detection groove 322 of an optical cable 300 and then output. Based on the above examination, it is possible to easily determine whether the optical cable is normal or defective, thereby easily determining the position of an abnormal portion when an optical signal transmission error occurs, without using an optical time domain reflectometer.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

The present invention relates to an optical cable for detecting an optical signal and a method of producing the same. A portion of the optical signal which is dissipated through a clad is introduced to an optical signal detection groove and then output through a subsidiary cover, thus it is possible to easily examine in real time whether the optical signal is desirably transmitted using the optical signal which is introduced to the optical signal detection groove of an optical cable and then output. Based on the above examination, it is possible to easily determine whether the optical cable is normal or defective, thereby easily determining the position of an abnormal portion when an optical signal transmission error occurs, without using an optical time domain reflectometer.

Description

[DESCRIPTION]
[invention Title] OPTICAL CABLE FOR OPTICAL SIGNAL DETECTION AND MANUFACTURING METHOD THEREOF [Technical Field] The present invention relates, in general, to an optical cable for detecting an optical signal and a method of producing the same and, more particularly, to an optical cable for detecting an optical signal, which is capable of detecting the optical signal using a circumferential surface thereof, and a method of producing the same.
[Background Art] /An optical cable having a circular section includes a core, a clad, and a jacket, in which the core is an optical fiber made of very thin glass or plastic and having a circular section, the clad surrounds the core to enable an optical signal to be maintained in the core and to provide strength to the core, and the jacket surrounds the clad to protect the core and the clad from being corroded due to moisture and from being worn and damaged due to external interference and external force . The optical cable is not affected by external interference, such as impactive noise or crosstalk, because it transmits the signal in the form of light, data transmissibility is excellent because it has a relatively wide bandwidth in comparison with other wire transmission media, and it is possible to reduce the size of a structure for supporting the optical cable because it has a relatively small size and weight in comparison with other transmission wires . A data transmission speed of an optical cable is about 1 Gbit, and, currently, it is frequently applied to local area networks, wide area networks, long-distance communication, military and subscriber lines . Meanwhile, since the above conventional optical cable is not provided with any means capable of detecting an optical signal, whether the optical signal is desirably output through an end of the optical cable must be checked using an optical power meter after the end connection part of the optical cable is removed in order to determine if the optical signal is desirably transmitted through the optical cable. Furthermore, when the optical signal is undesirably transmitted through the optical cable, it is necessary to check positions of abnormal portions using a costly optical time domain reflectometer (OTDR) . However, in the conventional method, it is difficult to rapidly examine the transmission state of the optical signal through the optical cable, it is very cumbersome to examine the transmission state of the optical signal and the positions of the abnormal portions, and the above examinations are conducted using a costly optical power meter or optical time domain reflectometer. Thus, the method is very disadvantageous in terms of maintenance and repair. Accordingly, there remains a need to easily examine the transmission state of the optical signal and the positions of the abnormal portions, and various technologies are frequently developed to satisfy the above need.
[Detailed description of Invention] [Technical Problem] Accordingly, the present invention has been made keeping in mind the above need, and an object of the present invention is to provide an optical cable for detecting an optical signal, which is capable of detecting the optical signal using a circumferential surface thereof, and a method of producing the same. [Technical Solution] The above object can be accomplished by providing an optical cable for detecting an optical signal according to the present invention. The optical cable comprises a cylindrical core, a clad which surrounds a circumferential surface of the core in a predetermined thickness, and a jacket which surrounds a circumferential surface of the clad in a predetermined thickness. An exposed surface is formed at an external part of the optical cable so that the clad is exposed, a plurality of optical signal detection grooves is longitudinally formed along the optical cable on the exposed surface at regular intervals, and the optical signal detection grooves are sealed with a subsidiary cover which is made of transparent or semi-transparent material having a refractive index that is lower than a refractive index of the clad. Furthermore, a method of producing the above optical cable for detecting the optical signal comprises applying liquid epoxy resin on an upper side of a silicon substrate, which has an optical cable mounting groove with an opened upper part, to a predetermined height; mounting the cylindrical optical cable in the optical cable mounting groove of the silicon substrate, sealing the optical cable using the epoxy resin so that a portion of the optical cable protrudes from the upper side of the silicon substrate, and hardening the epoxy resin through heat treatment to fix the optical cable to the silicon substrate using the epoxy resin; polishing the hardened epoxy resin and the optical cable flat so that a portion of a clad of the optical cable, which protrudes from the upper side of the silicon substrate, is exposed; applying a photoresist on an exposed surface of the optical cable; exposing the photoresist to form a pattern; etching the clad of the optical cable so as to longitudinally form a plurality of optical signal detection grooves along the optical cable at regular intervals; removing the remaining photoresist; removing the hardened epoxy resin by heat treatment to separate the optical cable having the optical signal detection grooves thereon from the silicon substrate; and sealing the optical signal detection grooves using a subsidiary cover which is made of transparent or semi-transparent material having a refractive index that is lower than a refractive index of the clad.
[Brief Description of Drawings] FIGS. 1 to 10 illustrate the production of an optical cable for detecting an optical signal according to the present invention; and FIGS. 11 to 16 illustrate the production of a silicon substrate used in the present invention.
[Mode for Carrying Out the Invention] Hereinafter, a detailed description will be given of the present invention, with reference to the accompanying drawings . FIGS. 1 to 10 illustrate the production of an optical cable for detecting an optical signal according to the present invention, in which FIGS. 1 to 4 and FIG. 8 illustrate front sectional views, and FIGS. 5 to 7 and FIGS. 9 and 10 illustrate side sectional views. An optical cable 300 for detecting an optical signal according to the present invention comprises a cylindrical core 310, a clad 320 which surrounds a circumferential surface of the core 310 in a predetermined thickness, and a jacket 330 which surrounds a circumferential surface of the clad 320 in a predetermined thickness. An exposed surface 321 is formed at an external part of the optical cable so that the clad 320 is exposed, a plurality of optical signal detection grooves 322 is longitudinally formed along the optical cable 300 on the exposed surface 321 at regular intervals, and the optical signal detection grooves 322 are sealed with a subsidiary cover which is made of transparent or semi-transparent material having a refractive index that is lower than the clad 320. According to the present invention, when the optical signal is normally transmitted through the core 310 of the optical cable 300, a portion of the optical signal which is dissipated through the clad 320 is introduced to the optical signal detection grooves 322, and then output through the subsidiary cover 340. Accordingly, when a general cylindrical optical cable is connected to the optical cable 300 for detecting the optical signal according to the present invention, and the optical signal, which is introduced to the optical signal detection grooves 322 of the optical cable 300 for detecting the optical signal and then output through the subsidiary cover 340, is detected by an optical sensor (not shown) , and when the detected signal is visually indicated using an output unit, such as a light emitting diode (LED; not shown) , it is possible to easily examine whether the optical signal is desirably transmitted, that is, whether the optical cable is normal or defective. Meanwhile, since a wavelength range of the optical signal which is output through the optical signal detection grooves 322 depends on the interval between the optical signal detection grooves 322, and since intensity of the output optical signal depends on the depth of the optical signal detection groove 322, the interval between the optical signal detection grooves 322 is controlled so as to correspond to the specific wavelength range to be detected, and the depth of the optical signal detection groove 322 is controlled so as to correspond to the desired intensity of the optical signal. Referring to FIGS. 1 to 10, a description of a method of producing the optical cable for detecting the optical signal according to the present invention will be given as follows . 1. The step of applying liquid epoxy resin 200 on an upper side of a silicon substrate 100 which has optical cable mounting grooves 111 with opened upper parts in a predetermined height (see FIG. 1) . Since epoxy resin 200 which is not subjected to heat treatment is liquid at room temperature, it is easy to apply liquid epoxy resin 200 on the upper side of the silicon substrate 100 in the predetermined height. 2. The step of mounting cylindrical optical cables 300 in the optical cable mounting grooves 111 of the silicon substrate 100, sealing the optical cables 300 using epoxy resin 200 so that portions of the optical cables 300 protrude from the upper side of the silicon substrate 100, and hardening epoxy resin 200 through heat treatment to fix the optical cables 300 to the silicon substrate 100 using epoxy resin 200 (see FIG. 2) . Each of the cylindrical optical cables 300 is a known optical cable 300 which comprises a cylindrical core 310, a clad 320 surrounding a circumferential surface of the core 310 in a predetermined thickness, and a jacket 330 surrounding a circumferential surface of the clad 320 in a predetermined thickness. They are used as an object during the production of the optical cable for detecting the optical signal. Epoxy resin 200 acts as an adhesive for strongly attaching the optical cable 300 to the silicon substrate 100, and functions to smoothly conduct a subsequent photoresist 400 coating process. 3. The step of polishing hardened epoxy resin 200 and the optical cables 300 to flatten them so that portions of the clads 320 of the optical cables 300, which protrude from the upper side of the silicon substrate 100, are exposed (see FIG. 3) . After the polishing is conducted as described above, exposed surfaces 321 at which the clads 320 are exposed are shaped into a chord. Meanwhile, sufficient spaces capable of forming optical signal detection grooves 322 therein must be assured between the exposed surfaces 321 and the cores 310, and the silicon substrate 100 must not be damaged by a polisher, in order that the silicon substrate 100 may be reused. 4. The step of applying a photoresist 400 on the exposed surfaces 321 of the optical cables 300 (see FIG.
4). Called photosensitive plastic or photosensitive polymer, the photoresist 400 is extensively known already, and a method of coating the photoresist is extensively known. Thus, a detailed description of this step is omitted. 5. The step of exposing the photoresist 400 to form a pattern (see FIG. 5) . If light or radioactive rays irradiate the photoresist 400, a structural change occurs only at an irradiated portion. The irradiated portion is immersed in a developing solution to be developed, thereby forming a predetermined pattern. The photoresist 400 is classified into a nega-type in which a portion structurally changed by light or radioactive rays is not dissolved in the developing solution, and a posi-type which is the opposite of the nega-type. Any type may be used in the present invention. The above pattern is formed so that a plurality of optical signal detection grooves 322 is longitudinally formed along the optical cable 300 at regular intervals. 6. The step of etching the clads 320 of the optical cables 300 so as to longitudinally form the plurality of optical signal detection grooves 322 along the optical cable 300 at regular intervals (see FIG. 6) . In the present embodiment, the clads 320 are etched using a well known B.O.E (buffered oxide etchant) . Since an etching method using the B.O.E. is frequently employed in a typical semiconductor fabrication process, a detailed description of this step is omitted. 7. The step of removing the remaining photoresist 400 (see FIGS. 7 and 8) . The removal of the photoresist is extensively known, thus a detailed description of this step is omitted. 8. The step of removing hardened -epoxy resin 200 by heat treatment to separate the optical cable 300 having the optical signal detection grooves 322 thereon from the silicon substrate 100 (see FIG. 9) . If epoxy resin 200, which is hardened using a separate heater (not shown) , is directly or indirectly heated, physical properties of hardened epoxy resin 200 are changed, thus it is possible to easily strip epoxy resin 200 having changed physical properties from the silicon substrate 100 and the optical cables 300. Needless to say, it is possible to remove still more epoxy resin 200 having changed physical properties from the silicon substrate 100 and the optical cables 300 using a separate washing process, if necessary. 9. The step of sealing the optical signal detection grooves 322 using a subsidiary cover 340 which is made of transparent or semi-transparent material having a refractive index that is lower than the clads 320 (see FIG. 10) . In the present embodiment, epoxy resin is used as the subsidiary cover 340, and liquid epoxy resin is applied on the optical signal detection grooves 322 and then heat treated so as to be hardened while liquid epoxy resin fills and seals the optical signal detection grooves 322. Meanwhile, the silicon substrate 100 having the optical cable mounting grooves 111 may be repeatedly used as a frame for producing the optical cable for detecting the optical signal, and is produced through the following procedure. 1. The step of heat treating a silicon substrate main body 110 to form an oxide layer 120 on a surface thereof (see FIG. 11) . If the silicon substrate main body 110 is heat treated, the surface of the silicon substrate main body 110 reacts with oxygen to form the oxide layer (Si02) 120. In the present embodiment, the silicon substrate main body 110 is put in an electric furnace and then heat treated at high temperatures for a predetermined time to form the oxide layer 120 in a thickness of 1 μ m or less on the upper surface of the silicon substrate main body 110. 2. The step of applying a photoresist 130 on the oxide layer 120 of the silicon substrate main body 110 (see FIG. 12) . In the present embodiment, the photoresist 130 is applied on the oxide layer 120 in a thickness of 1 μ m or less. 3. The step of exposing the photoresist 130 to form a pattern (see FIG. 13) . The pattern is longitudinally and straightly formed along the silicon substrate main body 110. 4. The step of etching the oxide layer 120 of the silicon substrate main body 110 to form a pattern (see FIG. 14) . 5. The step of removing the remaining photoresist 130 (see FIG. 15) . 6. The step of etching the silicon substrate main body 110 to form optical cable mounting grooves 111, thereby creating the silicon substrate 100 (see FIG. 16) . The form of corrosion of the silicon substrate main body 110 depends on an arrangement structure of particles, thus the forms of the optical cable mounting grooves 111 are controlled by adjusting the arrangement structure of the particles of the main body during the production of the silicon substrate main body 110. In the present embodiment, the silicon substrate main body 110 is etched with a KOH/H20 aqueous solution so that the optical cable mounting grooves 111 have triangular sections. The present invention has been described in an illustrative manner, and it is to be understood that the terminology used is intended to be in the nature of description rather than of limitation. Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, it is to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described. For example, the optical cable mounting grooves 111 of the silicon substrate 100 have triangular sections in the present embodiment, but may have semi-circular or polygonal, that is, tetragonal or more, sections, if necessary. Furthermore, it is unnecessary to completely seal the cylindrical optical cables 300 mounted in the optical cable mounting grooves 111 of the silicon substrate 100 using epoxy resin 200 as shown in FIG. 2 (portions of the optical cables may be exposed) , and a polishing process may be conducted through a multistage process using polishing stones having different roughnesses so as to smooth surfaces of epoxy resin 200 and the optical cables 300 which are to be polished and thus desirably achieve coating of the photoresist 400 (see FIG. 3) . [industrial Applicability] As described above, in the present invention, a portion of an optical signal which is dissipated through a clad 320 is introduced to an optical signal detection groove 322 and then output through a subsidiary cover 340, thus it is possible to easily examine in real time whether the optical signal is desirably transmitted using the optical signal which is introduced to the optical signal detection groove 322 of an optical cable 300 and then output. Based on the above examination, it is possible to easily determine whether the optical cable is normal or defective, thereby easily determining the position of an abnormal portion when an optical signal transmission error occurs, without using an optical time domain reflectometer.

Claims

[CLAIMS] [Claim l] An optical cable for detecting an optical signal, comprising: a cylindrical core; a clad which surrounds a circumferential surface of the core in a predetermined thickness; and a jacket which surrounds a circumferential surface of the clad in a predetermined thickness, wherein an exposed surface is formed at an external part of the optical cable so that the clad is exposed, a plurality of optical signal detection grooves is longitudinally formed along the optical cable on the exposed surface at regular intervals, and the optical signal detection grooves are sealed with a subsidiary cover which is made of transparent or semi-transparent material having a refractive index that is lower than a refractive index of the clad.
[Claim 2] A method of producing an optical cable for detecting an optical signal, comprising: applying liquid epoxy resin on an upper side of a silicon substrate, which has an optical cable mounting groove with an opened upper part, to a predetermined height; mounting the cylindrical optical cable in the optical cable mounting groove of the silicon substrate, sealing the optical cable using the epoxy resin so that a portion of the optical cable protrudes from the upper side of the silicon substrate, and hardening the epoxy resin through heat treatment to fix the optical cable to the silicon substrate using the epoxy resin; polishing the hardened epoxy resin and the optical cable flat so that a portion of a clad of the optical cable, which protrudes from the upper side of the silicon substrate, is exposed; applying a photoresist on an exposed surface of the optical cable; exposing the photoresist to form a pattern; etching the clad of the optical cable so as to longitudinally form a plurality of optical signal detection grooves along the optical cable at regular intervals; removing the remaining photoresist; removing the hardened epoxy resin by heat treatment to separate the optical cable having the optical signal detection grooves thereon from the silicon substrate; and sealing the optical signal detection grooves using a subsidiary cover which is made of transparent or semi- transparent material having a refractive index that is lower than a refractive index of the clad.
PCT/KR2004/003244 2004-01-16 2004-12-10 Optical cable for optical signal detection and manufacturing method thereof WO2005069052A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2004-0003344 2004-01-16
KR1020040003344A KR100616549B1 (en) 2004-01-16 2004-01-16 Optical cable for Optical signal detection and method manufacturing it

Publications (1)

Publication Number Publication Date
WO2005069052A1 true WO2005069052A1 (en) 2005-07-28

Family

ID=34793273

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2004/003244 WO2005069052A1 (en) 2004-01-16 2004-12-10 Optical cable for optical signal detection and manufacturing method thereof

Country Status (2)

Country Link
KR (1) KR100616549B1 (en)
WO (1) WO2005069052A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100651238B1 (en) * 2005-04-27 2006-11-30 주식회사 골드텔 Optical signal detector
KR100730300B1 (en) * 2005-09-14 2007-06-19 한국전자통신연구원 Optical signal detecting device using backward propagating cladding mode coupling
KR100798914B1 (en) * 2005-09-28 2008-01-29 한국전자통신연구원 Device for wavelength selective optical beam focusing using optical fiber and optical module unsing it
JP2007094350A (en) 2005-09-28 2007-04-12 Korea Electronics Telecommun Wavelength selective optical focusing apparatus using optical fiber and optical module using the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200310315Y1 (en) * 2003-01-24 2003-04-21 엘지전선 주식회사 Optical fiber unit for air blown installation and apparatus for manufacturing the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5979137A (en) 1982-10-28 1984-05-08 Agency Of Ind Science & Technol Detection for disconnection of optical fiber
US5170448A (en) 1992-01-06 1992-12-08 Motorola, Inc. Optical waveguide apparatus and method for partially collecting light
US5659643A (en) 1995-01-23 1997-08-19 Minnesota Mining And Manufacturing Company Notched fiber array illumination device
KR100416688B1 (en) * 2001-11-08 2004-01-31 주식회사 한택 Optical fiber block integrated with photo device
JP3631221B2 (en) 2002-05-17 2005-03-23 核燃料サイクル開発機構 Fiber spectroscopic detector and manufacturing method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200310315Y1 (en) * 2003-01-24 2003-04-21 엘지전선 주식회사 Optical fiber unit for air blown installation and apparatus for manufacturing the same

Also Published As

Publication number Publication date
KR100616549B1 (en) 2006-08-28
KR20050075800A (en) 2005-07-22

Similar Documents

Publication Publication Date Title
US5857053A (en) Optical fiber filter
CA2207226C (en) Optical fiber grating and method of manufacturing the same
US11644630B2 (en) High-density optical fiber ribbon interconnect and method of making
JPH085879A (en) Optical fiber ribbon
KR100655025B1 (en) Polymer optical waveguide
CN107045158A (en) A kind of optical fiber, its preparation method and its optical fiber optical grating array
JP2022153599A (en) Optical sensor and analyzing device using the same
WO2005069052A1 (en) Optical cable for optical signal detection and manufacturing method thereof
CN112678766B (en) Method for transferring nano structure and application thereof
JP4352133B2 (en) Adhesion method for adjacent optical components
KR100506200B1 (en) Double-coated optical fiber
WO2007013208A1 (en) Waveguide film cable
JP4525006B2 (en) Optical waveguide module
KR100639962B1 (en) Method for fabricating polymer waveguide for passive alignment to optical fiber in optical module
US20030000918A1 (en) Method for fabricating a protective cap for an optical waveguide core of a planar lightwave circuit device
JP3731293B2 (en) Optical fiber grating and manufacturing method thereof
GB2266161A (en) Optic waveguides with elastomer cladding
Hongo et al. Embedded small-diameter fiber Bragg grating sensors and high-speed wavelength detection
JP2005115020A (en) Optical fiber terminal structure and terminal fabrication method
JP4101009B2 (en) Two-layer recoat method
KR100322130B1 (en) Optical Waveguide Forming Method
Liu et al. Capped optical polymeric waveguide
KR20090044010A (en) Method for preparing an optical detector and the optical detector prepared using the method
KR200372567Y1 (en) V-groove block of optical fiber array
Omoto et al. Study on Hole-Assisted Single Mode Fiber With Low Rayleigh Scattering

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 69(1) EPC - EPO FORM 1205A SENT ON 23.10.2006

122 Ep: pct application non-entry in european phase