WO2015174355A1 - Fibre optique, ensemble connecteur de fibres optiques et ensemble de transmission par fibre optique - Google Patents

Fibre optique, ensemble connecteur de fibres optiques et ensemble de transmission par fibre optique Download PDF

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Publication number
WO2015174355A1
WO2015174355A1 PCT/JP2015/063393 JP2015063393W WO2015174355A1 WO 2015174355 A1 WO2015174355 A1 WO 2015174355A1 JP 2015063393 W JP2015063393 W JP 2015063393W WO 2015174355 A1 WO2015174355 A1 WO 2015174355A1
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Prior art keywords
optical fiber
light
cladding
core
clad
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PCT/JP2015/063393
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English (en)
Japanese (ja)
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寛 杉原
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株式会社ワイヤードジャパン
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Publication of WO2015174355A1 publication Critical patent/WO2015174355A1/fr

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    • 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
    • G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
    • 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
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • 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
    • 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
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables

Definitions

  • the present invention relates to an optical fiber, an optical fiber connector assembly, and an optical fiber transmission assembly. More particularly, the present invention relates to an optical fiber, an optical fiber connector assembly, and an optical fiber transmission assembly for realizing broadband transmission over a relatively short distance.
  • optical communication particularly optical fiber communication in the wavelength region including near infrared (for example, wavelength 850 nm band, 1.3 micron band) is expected to be promising as covering such applications.
  • optical communication using not only a conductive wire but also an optical fiber as a medium is employed in a physical layer of a communication protocol typified by Thunderbolt (registered trademark) or USB (Universal Serial Bus) 3.1.
  • Optical communication for the purpose of high-speed data transmission between electronic devices or within electronic devices is the same as conventional optical communication that has been applied to long-distance communication.
  • the aspect is greatly different in terms.
  • transmission is relatively short.
  • data communication is performed over a short distance of about 100 m or less, most of which are within and outside of 10 m, and sometimes about 1 m or less.
  • Communication between electronic devices or within electronic devices includes communication between servers in a server rack, data bus of a disk array in data storage, and communication between electronic devices in various devices such as transportation machines such as automobiles. This is an application where a dramatic increase in quantity is expected.
  • connection parts for interconnecting optical fibers it is ideal that light from the core of the upstream optical fiber is introduced only into the core of the downstream optical fiber to completely prevent leakage to the cladding.
  • this requires high-precision connecting parts such as connectors, and the skill of assembling optical fibers to them becomes too advanced.
  • One useful in short-distance broadband optical communication is a configuration in which a multimode optical fiber is used as a transmission line and a VCSEL is used as a light source.
  • optical fibers used for optical communication are roughly classified into single-mode type and multi-mode type according to the optical transmission mode of the core serving as a transmission path.
  • multimode type optical fibers are suitable for short-distance broadband optical communications. This is because it has a general characteristic that its core diameter is large and it is strong against bending as compared with a single mode type optical fiber. If the core diameter is large, not only does the manufacturing cost for connection to and interconnection with the light source decrease, but advanced technology is not required for connection processing when the component is attached to the optical fiber.
  • a transceiver for optical communication is also inexpensive, which is convenient for short-range broadband optical communication.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2013-56787.
  • Patent Document 2 JP 2012-2012 A
  • No. 133133 Japanese Patent No. 5281072.
  • short-distance broadband optical communication it is required to maintain a high transmission rate or further increase the transmission rate while suppressing costs.
  • transmission errors may increase as the communication speed is increased.
  • detection signal pulse The phenomenon is confirmed to be caused by the collapse of the waveform generated in the intensity waveform (hereinafter referred to as “detection signal pulse”) of the signal that passes through the short-distance optical fiber and is detected by the photodetector. did.
  • detection signal pulse the waveform generated in the intensity waveform
  • optical communication systems have been developed to increase both transmission speed and transmission distance. As long as either the low transmission speed or the short distance is satisfied, it can be said that the performance of the optical fiber is not a problem.
  • the shape of the detection signal pulse is deteriorated and the error increases even if the transmission speed is increased, despite a short distance.
  • the data transfer rate cannot be increased or the error rate cannot be reduced without suppressing the deterioration of the detection signal pulse.
  • the propagation of light in the cladding mode caused a problem.
  • Light that has entered the cladding separately from the light of the core to be used for communication propagates through the cladding at least to some extent (the propagation mode is referred to as a cladding mode).
  • the propagation mode is referred to as a cladding mode.
  • the clad mode light is attenuated relatively early compared to the light propagating through the core, so there is no problem.
  • clad mode light reaches the receiving end and is received by the light detection element without being distinguished from the light that has propagated through the core.
  • the light propagated in the clad mode causes the waveform of the detection signal pulse of the light detection element to be obscured and unclear.
  • an optical signal that is intensity-modulated at high speed is generated in order to increase the communication speed and a sharp change is also required in the detection signal pulse after reception, this phenomenon becomes apparent especially in short-distance communication using a short optical fiber. . It has been found that this is a limiting factor of transmission speed peculiar to short-distance optical communication.
  • the object of the present invention is to solve at least one of such problems.
  • the present invention provides an optical fiber, an optical fiber connector assembly, and a transmission system using an optical fiber that can realize a high transmission rate while suppressing the cost of the entire communication system.
  • the present invention contributes to the spread of high-speed data communication (short-range broadband communication) between electronic devices or within electronic devices.
  • the inventor of the present application has created an improved optical fiber structure capable of improving the communication speed of short-distance broadband communication without sacrificing ease.
  • an optical fiber extending from the first end to the second end, the core extending from the first end to the second end, and propagating light for communication in a multimode
  • a first clad disposed around the outer periphery of the core and exhibiting a lower refractive index than the core with respect to the light, and disposed around the outer periphery of the first clad, with respect to the light from the first cladding.
  • a second clad exhibiting a high refractive index when the light is incident on the first end for communication, the core itself itself from the first end of the light for communication Part of the light incident on the second end is propagated to the second end, the first clad suppresses the partial light from leaching from the core, and the second clad Of the light for the clad mode, Leached in the second cladding from the outer periphery of the first cladding, and the optical fiber is intended to prevent the return to the first cladding is provided.
  • the refractive index of the second cladding is higher than that of the first cladding, the light that enters the cladding mode and propagates through the first cladding is the boundary between the first cladding and the second cladding.
  • the light enters the second clad it oozes out to the second clad side and hardly returns to the first clad side.
  • light incident from the first end of the optical fiber from another upstream optical fiber or light (in the case of interconnection) from the upstream light source (in the case of a transmission assembly) is transmitted to the first cladding or the second cladding.
  • the light in the clad mode is concentrated on the second clad.
  • the light propagates through the second cladding without returning to the first cladding. Since some layer (such as a coating layer) exists further outside the second cladding, the light of the second cladding is also rapidly attenuated. As a result, the light that continues to propagate in the cladding mode does not reach the second end. Note that the light used for communication propagates through the core in the same manner as a conventional optical fiber.
  • the role of the second clad fulfilled as a result of the above function is to draw light propagating through the first clad in the clad mode into itself and quickly attenuate it.
  • the photodetecting element As an effect of this role, even if a clad mode propagating through the first clad occurs, it is finally suppressed from reaching the photodetecting element as it is at the second end.
  • the removal of the light that arrives at a different timing increases the proportion of the light propagating through the core in the received light.
  • a detection signal pulse reflecting the steep intensity change can be obtained by the photodetecting element, and the entire optical communication system can be widened. Can do.
  • the second cladding is thinner than the thickness of the first cladding.
  • the core is formed by drawing a preform created by an MCVD (modified chemical vapor deposition) method.
  • the core has a graded index type refractive index distribution.
  • the second clad is formed of a synthetic resin.
  • the first cladding is made of a synthetic resin having a lower refractive index than the second cladding.
  • the synthetic resin is preferably an ultraviolet curable or thermosetting synthetic resin.
  • the optical fiber has a fluororesin coating layer formed so as to surround an outer periphery of the second cladding.
  • an optical fiber connector assembly in another aspect of the present invention, is provided. That is, in the present invention, an optical fiber connector assembly including an optical fiber extending from a first end to a second end and an optical connector attached to an end portion reaching the first end of the optical fiber, An optical fiber extends from the first end to the second end, and is disposed so as to surround a core that propagates light for communication in a multimode, and has a lower refractive index than the core with respect to the light.
  • the optical connector comprises the light
  • a sleeve-shaped crimp fitting having a second hole for accommodating the optical fiber formed at the other end, and a second hole for accommodating the optical fiber.
  • the hole has a smaller hole diameter than the outer diameter of the rear end portion of the flange, and the crimp fitting is attached to the rear end portion of the flange in the first hole and directly or in the second hole.
  • the optical fiber is gripped by pressure via an inclusion covering the optical fiber, and the light for communication is incident on the first end of the optical fiber accommodated in the optical connector
  • the core propagates a part of the light for communication incident on the first end from the first end to the second end, and the first clad extends from the core to the part.
  • the second clad causes the clad mode light out of the light for communication to be leached from the first clad to the second clad and prevents the clad mode light from returning to the first clad.
  • An optical fiber connector assembly is provided.
  • a fiber optic transmission assembly is provided. That is, according to the present invention, an optical fiber extending from a first end to a second end and a light including a vertical cavity surface emitting laser (VCSEL) element that emits light for communication and enters the first end of the optical fiber.
  • VCSEL vertical cavity surface emitting laser
  • the VCSEL element is positioned so that light is incident on the end face of the core at the first end of the optical fiber, and the intensity of the communication is modulated by an electrically modulated signal.
  • the core emits light from the first end of the light when the light from the VCSEL element is incident on the first end of the optical fiber.
  • a part of the light is propagated to the second end, the first cladding suppresses the part of the light from leaching from the core, and the second cladding
  • An optical fiber transmission assembly is provided that leaches clad mode light from the first clad to the second clad and prevents the clad mode light from returning to the first clad.
  • clad mode light propagating through an optical fiber clad is attenuated while propagating for a very short distance. For this reason, even if the transmission rate is increased, an appropriate detection signal pulse can be obtained, and the transmission rate of short-distance broadband communication can be increased (broadband).
  • FIGS. 1 and 2 are a partially broken configuration diagram showing a configuration of an example of an optical fiber according to an embodiment of the present invention, a radial sectional view (FIG. 2A), and a refractive index distribution (FIG. 2B), respectively.
  • the optical fiber 100 extends from the first end 110 to the second end, and is formed to surround the core 10, the first clad 21 formed around the outer periphery of the core 10, and the outer periphery of the first clad 21.
  • the second cladding 22 is provided. If necessary, the optical fiber 100 further includes a coating layer 30 formed so as to surround the outer periphery of the second cladding 22.
  • the core 10 extends from the first end 110 to the second end 120 and propagates light for communication in a multimode. Both the first cladding 21 and the second cladding 22 function as claddings for the core 10.
  • the first cladding 21 is disposed so as to surround the outer periphery of the core 10, and the material thereof has a refractive index lower than that of the core 10 for light for communication.
  • the second cladding 22 is disposed so as to surround the outer periphery of the first cladding 21, and the material thereof has a higher refractive index than the first cladding 21 with respect to light for communication.
  • light from a light emitting element enters the first end 110, and light from the second end 120 is detected by a light detecting element (not shown).
  • a light detecting element not shown.
  • the first cladding 21 suppresses the partial light from leaching from the core 10.
  • the second clad 22 causes the second clad 22 to leach light that becomes a clad mode out of the light for communication from the outer periphery of the first clad 21. Further, the second cladding 22 suppresses the light that has entered the cladding mode from returning to the first cladding 21 again.
  • the light for communication is detected as light propagating only through the core 10 under ideal operation. If the incident light is intensity-modulated, the modulation appears as it is in the light emitted from the second end 120. Actually, the light passing through only the core 10 is also affected by multi-mode dispersion, that is, the effect of the difference in optical distance between the low-order mode and the high-order mode in the core. As a result, the timing of the optical signal is shifted between the low-order mode and the high-order mode, and the rising and falling of the intensity-modulated optical signal pulse become slow.
  • the communication light includes not only light that enters only the core 10, but also light that enters the portion (cladding) other than the core 10 at the first end 110.
  • the light that enters the clad (clad mode light) propagates through the clad while being attenuated more strongly than the core 10.
  • the light in the cladding mode reaches the second end 120 and exits before being attenuated.
  • the clad has a refractive index smaller than that of the core, the light in the clad mode in the optical signal whose intensity is modulated arrives earlier than the timing at which the light reaches the second end 120 via the core 10. For this reason, the light in the cladding mode greatly deteriorates the detection signal pulse of the light detection element. This limits the upper limit of the transmission speed of the short distance communication in the conventional optical fiber communication.
  • the clad is composed of two layers of the first clad 21 having a relatively low refractive index and the second clad 22 having a relatively high refractive index.
  • the clad mode light is prevented from leaching from the outer periphery of the first cladding 21 to the second cladding 22 and returning to the first cladding 21 by the function of the second cladding 22 described above.
  • the light in the clad mode is largely biased toward the second clad 22, and is strongly affected by the coating layer 30 and attenuated over a short distance. This is a mechanism capable of realizing short-range broadband communication with the optical fiber 100.
  • the light in the clad mode is not necessarily limited to the light incident on the first clad 21 or the second clad 22 at the first end 110, but is affected by bending or the like to move from the first end 110 to the second end 120. It also includes light that starts to propagate through the first cladding 21 or the second cladding 22 at any position.
  • the specific sizes of the optical fiber 100 of the present embodiment described above are typically 50 ⁇ m to 65 ⁇ m in diameter of the core 10, 200 ⁇ m in outer diameter of the first cladding 21, and 230 ⁇ m in outer diameter of the second cladding 22.
  • the thickness (coating thickness) of the first cladding 21 is 67.5 ⁇ m to 75 ⁇ m
  • the second cladding 22 is 15 ⁇ m. It is advantageous in the following two points that the second clad 22 is thinner than the first clad 21 as in this dimension.
  • the clad mode light concentrated on the second clad 22 is strongly influenced by the outer coating layer 30, and the clad mode light in the second clad 22 is rapidly attenuated.
  • the reflection function for the core to be performed by the first cladding is kept intact.
  • the specific size shown here is an illustration, and this embodiment is not limited to these.
  • the core 10 is mainly made of quartz, and the graded index adjusted so that the refractive index at the center is maximized by controlling the addition amount of a substance such as germanium. With a refractive index profile of the mold (FIG. 2B).
  • the core 10 is formed by drawing a preform created by, for example, an MCVD (modified chemical vapor deposition) method. Unlike the VAD (vapor-phase axial deposition) method or the like, the MCVD method has an advantage that the interface between the core and the cladding can be accurately arranged and the characteristics of the optical fiber can be precisely controlled.
  • MCVD modified chemical vapor deposition
  • the core 10 manufactured in this way can control the characteristics of the fiber so that there is a low loss wavelength band centered on the wavelength of 850 nm, and thus constitutes an inexpensive and high-speed optical transmission line using a VCSEL as a light source. Suitable for doing.
  • the first cladding 21 is made of a material showing a lower refractive index than the core 10.
  • the material of the first clad 21 is not particularly limited, and for example, it can be formed of a material mainly composed of quartz similar to the core 10 or a synthetic resin other than that.
  • a fluororesin such as PTFE can be used.
  • the first clad 21 may be an ultraviolet curable or thermosetting synthetic resin, and may be formed by applying a synthetic resin liquid to the surface of the core 10 drawn from the preform and curing it.
  • the second clad 22 is made of a material having a higher refractive index than that of the first clad 21 and can be formed using an ultraviolet curable or thermosetting synthetic resin.
  • Forming either or both of the first cladding 21 and the second cladding 22 with a synthetic resin has a great practical advantage. Since plastic deformation occurs in response to pressure in a synthetic resin, appropriate friction occurs when gripped by a crimping fitting, which will be described later, to increase the reliability of connector mounting processing, or to use the optical fiber 100 in the axial direction during use. Displacement (pistoning) can be effectively suppressed.
  • the covering layer 30 is a layer for protecting the core of the optical fiber composed of the core 10, the first cladding 21, and the second cladding 22, and is formed using, for example, a fluororesin such as ETFE.
  • the refractive index of the second cladding 22 is higher than that of the first cladding 21, as shown by the graph in FIG. 2B.
  • Light incident on the boundary between the first cladding 21 and the second cladding 22 is less likely to be reflected to the first cladding 21 side, and is likely to enter the second cladding 22 side and be attenuated. That is, the optical fiber 100 has the ability to remove light in the cladding mode at a very short distance.
  • the light entering the first cladding 21 from the light source is easily attenuated before reaching the receiving end (second end) of the optical fiber, and the light propagating through the first cladding 21 and the light propagating through the core 10 It is possible to suppress the collapse of the detection signal pulse due to the superposition of.
  • the optical fiber 100 has a structure in which a first cladding 21 and a second cladding 22 made of synthetic resin cured by ultraviolet rays or heat are formed on the outer periphery of a core 10 mainly made of quartz. .
  • a first cladding 21 and a second cladding 22 made of synthetic resin cured by ultraviolet rays or heat are formed on the outer periphery of a core 10 mainly made of quartz.
  • chipping and peeling are less likely to occur on the cut end face, and excellent specularity can be obtained, so that good transmission characteristics can be realized while being a simple construction method by crimp-and-cleave.
  • bending loss and caulking loss are reduced, handling property, workability, and connector connection workability can be improved.
  • optical fiber 100 makes it possible to easily perform the optical fiber connection processing without special skills, and to realize automatic assembly.
  • optical fiber 100 if the optical fiber 100 according to the present embodiment is employed, it is possible to reduce the cost to the extent that it is inferior to a communication path using conventional conductors.
  • the first clad 21 and the second clad 22 formed on the outer periphery of the core 10 have been described as being formed by separate coatings for the purpose of clarifying the function. It is not essential for carrying out the embodiment.
  • the present embodiment can be implemented by forming the first cladding 21 and the second cladding 22 using a continuous medium. For example, a single coating that will later become the first clad 21 and the second clad 22 is once formed, and thereafter, processing or treatment that affects a depth range of several ⁇ m from the surface is performed to change the refractive index of the portion. The region can be increased to be the second cladding 22.
  • a substantially similar structure can be produced without forming the coating multiple times.
  • the two cladding layers (21, 22) are formed on the outer periphery of the core 10, but the present invention is not limited to this.
  • three or more cladding layers may be formed on the outer periphery of the core. In that case, the light entering the cladding can be easily attenuated by increasing the refractive index of the cladding on the outer layer side as compared with the cladding on the inner layer side.
  • FIG. 3 is a cross-sectional view showing a structure of a typical optical fiber connector assembly, showing a cross section cut along a plane through which light passes.
  • the optical fiber connector assembly includes an optical connector 200 and an optical fiber 100 similar to that shown in FIGS.
  • the optical connector 200 is attached to the end that reaches the first end 110 of the optical fiber 100.
  • the optical fiber 100 is appropriately covered with a resin buffer and jacket 40 for protection during handling.
  • the optical connector 200 is used to interconnect the end of the optical fiber 100 from which the buffer and jacket 40 have been removed to another optical connector (not shown) that forms a pair.
  • the optical connector 200 includes a ferrule 220 with a flange and a sleeve-shaped crimp fitting 240.
  • the flanged ferrule 220 includes a ferrule 222 and a flange 226 at the front end and the rear end, respectively.
  • the flanged ferrule 220 includes through holes 224A and 224B through which the optical fiber 100 passes.
  • the ferrule 222 of the ferrule with a flange accommodates the end of the optical fiber 100 reaching the first end 110 inside.
  • the optical connector 200 may be provided with a housing (not shown) so as to facilitate the attaching / detaching operation.
  • a first hole 242 for accommodating the rear end 226E of the flange 226 in the ferrule 220 with a flange is formed at one end, and a second hole 244 for accommodating the optical fiber 100 is formed at the other end. It is formed at the end.
  • the second hole 244 of the crimping fitting 240 has a smaller hole diameter than the outer diameter of the rear end portion of the flange. The crimping fitting 240 grips the rear end portion of the flange 226 in the first hole 242 by crimping, and directly or via the coating layer 30 which is an inclusion covering the optical fiber 100 in the second hole 244, the optical fiber 100. Is gripped by crimping.
  • the crimp fitting 240 is typically composed of two members, an outer sleeve 240A and an inner sleeve 240B.
  • the outer sleeve 240 ⁇ / b> A is deformed by crimping for crimping, and itself functions to retain its shape by plastic deformation at least partially as illustrated by arrows.
  • the inner sleeve 240 ⁇ / b> B functions to properly hold the optical fiber 100.
  • the first hole 242 is defined by the inner diameter of the outer sleeve 240A
  • the second hole 244 is defined by the inner diameter of the inner sleeve 240B.
  • the material of the outer sleeve 240A and the inner sleeve 240B is appropriately selected in accordance with the respective functions described above. For example, steel, brass, copper, zinc, aluminum, other metals, or synthetic resin is used.
  • the optical fiber 100 in such an optical fiber connector assembly has a capability of removing light in a clad mode at a very short distance.
  • the reason seems to be related to the fact that the second clad 22 and the covering layer 30 are more closely adhered to each other by being crimped by the crimping fitting 240 in addition to the characteristics of the optical fiber 100 itself.
  • the conventional precision is not required for the processing accuracy of the optical connector 200 itself and the processing accuracy for fixing the optical fiber 100 to the optical connector 200.
  • the precision required for a connector component (combined with the optical connector 200) for connecting the other optical fiber and the present optical fiber is also provided. Alleviated. As a result, if this optical fiber connector assembly is employed, an optical communication system for realizing short-distance broadband communication can be provided at low cost.
  • the first cladding 21 or the second cladding 22 is formed of a synthetic resin. If the first cladding 21 or the second cladding 22 is made of a material that is easily plastically deformed in addition to the inner sleeve 240 ⁇ / b> B and the covering layer 30, the optical fiber 100 can be stably held by the crimping force of the crimping fitting 240.
  • FIG. 4 is a cross-sectional view illustrating the structure of a typical fiber optic transmission assembly 300.
  • the optical fiber transmission assembly 300 includes a vertical cavity surface emitting laser (VCSEL) element 320.
  • the VCSEL element 320 emits light for communication and enters the first end 110 of the optical fiber 100.
  • 4 illustrates a configuration having an optical path in which light is incident on the optical fiber 100 from the VCSEL element 320 through the opening 352 of the substrate 350 and the light L is bent by about 90 ° by the mirror M.
  • VCSEL vertical cavity surface emitting laser
  • the relative positions of the optical fiber 100 and the VCSEL element 320 themselves are fixed using an appropriate fixing support member like the substrate 350 shown in FIG. Specifically, the VCSEL element 320 is positioned and arranged so that light is incident on the end face of the core 10 at the first end 110 of the optical fiber 100.
  • VCSEL element 320 emits light whose intensity is modulated by an electrically modulated signal.
  • the optical fiber 100 is similar to that described above. For this reason, the effect on the light of the optical fiber 100 when the light from the VCSEL element 320 is incident on the first end 110 of the optical fiber 100 is the same as described above.
  • the optical fiber 100 since the optical fiber 100 is employed, the light in the clad mode does not reach the second end (not shown in FIG. 4) of the optical fiber 100. Therefore, for the purpose of completely preventing incidence on the first end 110 in the clad mode, for example, the positional accuracy of the optical fiber 100 and the VCSEL element 320 indicated by z1, x1, z2, and x2 in FIG. 4 is increased. The need itself goes down. That is, in the optical fiber transmission assembly 300, the tolerance of positional accuracy is large with respect to the relative position between the VCSEL element 320 and the optical fiber 100.
  • the relative position between the optical fiber and the VCSEL element can be positioned with high accuracy, or the core at the first end It is necessary to use an orifice 50 (FIG. 5) or the like that prevents light from entering other areas.
  • the optical fiber transmission assembly 300 of the present embodiment can be easily implemented, and thus has high economic practicality.
  • various things can be employ
  • optical fiber, the optical fiber connector assembly, and the optical fiber transmission assembly of the present invention can be used in any device and system that employs data communication by optical fiber.

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

La présente invention concerne une fibre optique qui produit une bande passante de transport élevée sur une distance relativement courte. Ladite fibre optique (100) s'étend depuis une première extrémité (110) vers une seconde extrémité (120) et comprend un cœur (10), une première gaine (21) formée de manière à entourer ledit cœur et une seconde gaine (22) formée de manière à enfermer ladite première gaine. La lumière à des fins de communication se propage à travers le cœur dans de multiples modes. Ensemble, la première gaine et la seconde de gaine fonctionnent comme une gaine pour le cœur. La première gaine, qui est positionnée de manière à entourer le cœur, est fabriquée à partir d'un matériau qui présente un indice de réfraction plus bas que le cœur par rapport à la lumière susmentionnée à des fins de communication et la seconde gaine, qui est positionnée de manière à entourer la première gaine, est constituée d'un matériau qui présente un indice de réfraction supérieur à celui de la première gaine par rapport à ladite lumière.
PCT/JP2015/063393 2014-05-14 2015-05-08 Fibre optique, ensemble connecteur de fibres optiques et ensemble de transmission par fibre optique WO2015174355A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3754397A1 (fr) * 2019-06-19 2020-12-23 Senko Advanced Components Inc. Ensemble connecteur de fibres optiques avec sous-ensemble de tube de sertissage et procédé d'utilisation

Citations (8)

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