WO2002018995A1 - Coupleur optique asymetrique, emetteur-recepteur optique, et dispositif de multiplexage en longueur d'onde - Google Patents

Coupleur optique asymetrique, emetteur-recepteur optique, et dispositif de multiplexage en longueur d'onde Download PDF

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Publication number
WO2002018995A1
WO2002018995A1 PCT/JP2001/007194 JP0107194W WO0218995A1 WO 2002018995 A1 WO2002018995 A1 WO 2002018995A1 JP 0107194 W JP0107194 W JP 0107194W WO 0218995 A1 WO0218995 A1 WO 0218995A1
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WO
WIPO (PCT)
Prior art keywords
optical
optical fiber
mode
fiber
asymmetric
Prior art date
Application number
PCT/JP2001/007194
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English (en)
Japanese (ja)
Inventor
Takeshi Ota
Original Assignee
Photonixnet 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 Photonixnet Kabushiki Kaisha filed Critical Photonixnet Kabushiki Kaisha
Priority to AU2001280111A priority Critical patent/AU2001280111A1/en
Priority to JP2002523658A priority patent/JPWO2002018995A1/ja
Publication of WO2002018995A1 publication Critical patent/WO2002018995A1/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
    • G02B6/24—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
    • 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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/125—Bends, branchings or intersections

Definitions

  • the present invention relates to optical fiber communication.
  • it relates to an optical power blur applied to bidirectional communication using a multimode optical fiber.
  • FIG. 13 (a) is a schematic diagram of a multimode optical fiber, in which the Z axis indicates the axial direction (light propagation direction) of the optical fiber, and the X axis indicates the radial direction of the optical fiber. ing.
  • FIG. 13 (b) shows the refractive index distribution of the multimode optical fiber, and also shows the notch. As can be seen from Fig. 13 (b), the notch indicates that the refractive index at the center of the optical fiber core is smaller than the ideal parabolic distribution.
  • the propagation speed differs between the optical path passing near the center of the optical fiber core (low-order mode) and the optical path passing around the optical fiber core ( ⁇ -order mode).
  • the problem is that the delay between modes (DMD: Differential Mode D e 1 ay) occurs. Since the optical signal propagation speed differs depending on the optical path (mode), the optical pulse is distorted in time, and the upper limit of the communication speed is determined by the DMD.
  • FIG. 14 shows the concept of the mode in the distributed refraction type multimode optical fiber.
  • the Z axis indicates the optical axis direction of the optical fiber
  • the X axis indicates the radial direction of the optical fiber.
  • light travels in a sine curve with respect to the optical axis.
  • Light 101 with a small sine-carp amplitude and traveling only near the optical axis is the low-order mode
  • light 102 with a large sine-cape amplitude and passing through the core periphery is a high-order mode Is.
  • a so-called single mode optical fiber is an optical fiber having a single number of modes that can be propagated. Since there is only one mode in a single mode optical fiber, there is no DMD problem. Therefore, long-distance broadband transmission is possible, and single-mode optical fibers are preferably installed for long-distance optical communication.
  • the single-mode optical fiber has a drawback that the connection operation is difficult because the core diameter is as small as about 10 microns. For this reason, there is a historical background that distributed index multimode optical fibers have been favorably laid for short-distance communications. Disclosure of the invention
  • DMD DifferentildeModeDe1ay
  • an asymmetric type optical power bra of the present invention is an optical power bra that couples optical signals of first and second optical fibers to a third optical fiber, wherein the first and second optical fibers are In an asymmetrical optical power coupler in which the optical signals of the optical fibers are coupled to the third optical fiber at different coupling ratios, the first optical fiber is a single mode optical fiber, and the second and third optical fibers are It is characterized by comprising a multimode optical fiber.
  • a flat rectangular optical waveguide circuit is provided, and the width of the first rectangular optical waveguide corresponding to the first optical fiber is smaller than the width of the rectangular waveguide corresponding to the second optical fiber.
  • the first rectangular optical waveguide corresponding to the first optical fiber and the rectangular waveguide corresponding to the second optical fiber are coupled to the third optical fiber in a separated state. It is characterized by doing.
  • first planar rectangular optical waveguide circuit and the second planar rectangular optical waveguide circuit The core diameter of the optical waveguide provided in the first flat rectangular optical waveguide circuit is also smaller than the core diameter of the optical waveguide provided in the second flat optical waveguide circuit, and the first and second optical waveguide circuits are provided.
  • the flat optical waveguide circuit is provided so that the surfaces on which the optical waveguides are provided are in close contact with each other, and is coupled to the third optical fiber.
  • it is characterized by comprising an offset packet in which a single-mode optical fiber and a multi-mode optical fiber are connected with their central axes shifted from each other, and a multi-mode evanescent optical power blur.
  • an optical transceiver is an optical transceiver including the asymmetrical optical power bra, wherein the first optical fiber has a light source, the second optical fiber has a light receiving element, and the third optical fiber has a third optical fiber.
  • a transmission optical fiber is connected to each fiber.
  • a light source is directly coupled to an optical waveguide to be connected to the first optical fiber, and a light receiving element is provided to the optical waveguide to be connected to the second optical fiber.
  • a transmission optical fiber is connected to the third optical fiber.
  • the wavelength multiplexing device of the present invention includes the asymmetric power blur, further includes a single mode optical multiplexer and a multi-mode wavelength multiplexing module, and transmits the light sources having different wavelengths to the single mode optical multiplexing.
  • a plurality of light receiving elements are coupled by the multi-mode wavelength multiplexing module, and the glue mode optical multiplexer and the wavelength multiplexing module are coupled by the asymmetric optical power bra.
  • the optical transceivers having different wavelengths are provided in a plurality of units, and the passive wavelength multiplexer is provided in a unit shape.
  • the passive wavelength multiplexer is connected by an optical fiber cord provided with a pair of a single mode optical fiber and a multimode optical fiber.
  • an optical transceiver includes a light source, a light receiving element, and an asymmetric single-mode evanescent light power bra, wherein the asymmetric single-mode evanescent light power bra comprises a first single-mode optical fiber and An optical power coupler for coupling an optical signal of a second single-mode optical fiber to a third single-mode optical fiber, wherein The coupling ratio (K 1) between the single-mode optical fiber and the third single-mode fiber is smaller than the coupling ratio (K 2) between the second single-mode fiber and the third single-mode fiber (K 1 ⁇ K 2) It is characterized in that the light source is connected to a first optical fiber, the light receiving element is connected to a second optical fiber, and a single-mode optical fiber for transmission is connected to a third optical fiber. I do.
  • the coupling ratio (K 1) between the first single-mode optical fiber and the third single-mode optical fiber, and the second single-mode optical fiber and the third single-mode optical fiber Is characterized by a ratio of 2 / ⁇ 1 ⁇ 3 to a coupling ratio ( ⁇ 2).
  • the ratio of the bonding ratio is ⁇ 2 / / 1 ⁇ 10.
  • the following three functions can be realized. That is, (1) the function of the optical power blur for realizing bidirectional optical communication, and (2) the selective excitation that enables wideband transmission by eliminating the inter-mode delay (DMD) by selectively exciting only higher-order modes. (3) Non-reciprocal element using statistical effect, function of statistical effect optical isolation.
  • the transmission band can be improved in the wavelength multiplexed bidirectional optical signal transmission using the multimode optical fiber.
  • optical transceiver having the above configuration, it is possible to prevent a transmission optical signal of one station from disturbing a modulation of a light source of another station without using an optical isolator utilizing the magneto-optical effect. Therefore, two-way optical communication can be realized.
  • FIG. 1 is a top view of an asymmetrical optical power bra according to a first embodiment of the present invention.
  • FIG. 2 is a configuration perspective view of the asymmetrical optical power bra according to the first embodiment of the present invention.
  • FIG. 3 is a diagram for explaining “separation” in a flat rectangular waveguide circuit used in the asymmetric optical power bra according to the first embodiment of the present invention.
  • FIG. 4 is a diagram of a bidirectional optical fiber communication system using the asymmetric optical power bra of FIG.
  • FIG. 3 is a diagram illustrating a configuration.
  • FIG. 5 is a configuration perspective view showing an asymmetrical optical power bra according to a second embodiment of the present invention.
  • FIG. 6 is a schematic view showing an asymmetrical optical power bra according to a third embodiment of the present invention.
  • FIG. 7 is a schematic view showing a modified example of the asymmetrical optical power bra according to the third embodiment of the present invention.
  • FIG. 8 is a schematic diagram showing one embodiment of a wavelength multiplexing apparatus to which an asymmetrical optical power blur according to a fourth embodiment of the present invention is applied.
  • FIG. 9 is a configuration perspective view showing an overview of the wavelength multiplexing apparatus.
  • FIG. 10 is a diagram showing a configuration of the optical fiber cable 35.
  • FIG. 11 is a diagram showing an optical transceiver according to a fifth embodiment of the present invention.
  • FIG. 12 is a diagram showing the connection relationship between the asymmetric single-mode evanescent optical power brass 51a and 51b and the single-mode optical fiber 56 for transmission.
  • FIG. 13 is a diagram for explaining the notches present in the refractive index distribution of a conventionally installed distributed index multimode optical fiber.
  • FIG. 14 is a diagram showing the concept of a mode in a distributed refraction type multimode optical fiber.
  • FIG. 1 shows a top view of a first embodiment of the asymmetrical optical power bra of the present invention.
  • FIG. 2 is a perspective view showing the structure of a first embodiment of the asymmetrical optical power bra according to the present invention.
  • a first rectangular optical waveguide 5 and a second rectangular optical waveguide 6 having a constant thickness and different waveguide widths are provided on a flat rectangular optical waveguide substrate 1.
  • the core 7 of the single-mode optical fiber 2 is connected to the first rectangular optical waveguide 5.
  • the core 8 of the multimode optical fiber 3 is connected to the second rectangular optical waveguide 6.
  • the first rectangular optical waveguide 5 and the second rectangular optical waveguide 6 are connected to the core 9 of the multimode optical fiber 4 in a separated state without merging.
  • the first rectangular optical waveguide 5 and the second rectangular optical waveguide 6 remain separated without merging" as shown in FIG. 3 as the first rectangular optical waveguide 5 and the second rectangular optical waveguide.
  • the optical waveguide 6 is separated from the end face of the flat rectangular optical waveguide substrate 1 by a distance d, which means that d is d ⁇ 0.
  • FIG. 4 is a diagram showing a configuration of a bidirectional optical fiber communication system using the asymmetric optical power bra of FIG. Two stations are connected by multi-mode optical fiber 2 6 stations Metropolitan station and power 5 for transmission.
  • the station comprises a transmitting unit 21a, a receiving unit 22a, and an asymmetric optical power bra 1a.
  • the transmitting section 21a is connected to the asymmetric optical power bra 1a and the single mode optical fiber 2a.
  • the receiving section 22a is connected to the asymmetric optical power bra 1a and the multimode optical fiber 3a.
  • the output-side multi-mode optical fiber 4a of the asymmetric optical power blur 1a is connected to the transmission multi-mode optical fiber 26.
  • the ⁇ station is composed of a transmitting section 21b, a receiving section 22b, and an asymmetric optical power bra 1b.
  • the transmitting section 21b is connected to the asymmetric optical power bra 1b and the single-mode optical fino 2b.
  • the receiving unit 22b is connected to the asymmetric optical power bra 1b and the multi-mode optical fiber 3b.
  • the output-side multi-mode optical fiber 4b of the asymmetric optical power blur 1b is connected to the transmission multi-mode optical fiber 26.
  • the optical signal from the transmitting section 21a is coupled to only the higher-order mode of the multi-mode optical fiber 26 for transmission by the asymmetric optical power blur 1a.
  • the optical signal that has propagated through the transmission multi-mode optical fiber 26 over a sufficiently long distance is evenly distributed to the higher-order modes of the transmission multi-mode optical fiber 26, so that the optical signal is distributed around the optical fiber core.
  • the energy is distributed uniformly (ring distribution) and is incident on the asymmetrical optical power bra 1b on the b station side.
  • Most of the light having the ring-shaped distribution is sent to the receiver 22b via the multimode optical fiber 3b.
  • a very small portion of the light having the ring distribution is coupled to the single mode optical fiber 2b and sent to the transmission section 21b. All the flow from the small pipe flows into the large pipe, but only a small part of the flow from the large pipe flows into the small pipe. This is a non-reciprocal phenomenon based on statistical effects.
  • the non-phase half phenomenon based on this statistical effect realizes the same function as the so-called optical isolation.
  • the optical non-reciprocal element used is an optical isolator. I was The asymmetric type optical power bra of the present invention can realize a function substantially equivalent to this optical isolator by a different principle.
  • the asymmetric optical power bra of the present invention can simultaneously realize the following three functions.
  • the light receiving element is a flat rectangular waveguide substrate 1 shown in FIG. It may be directly connected to.
  • FIG. 5 is a configuration perspective view showing an asymmetrical optical power plug 10 according to a second embodiment of the present invention.
  • an asymmetrical optical power bra is configured using a flat optical waveguide substrate composed of rectangular waveguides having a constant thickness and different widths, but in the present embodiment, two flat optical waveguides are used.
  • the same functions as those of the first embodiment are realized by bonding the substrates 11 to 13 together.
  • a single-mode optical waveguide 12 having a circular core is formed on the first planar optical waveguide substrate 11 by an ion exchange method.
  • a multi-mode optical waveguide 14 having a circular core is formed on the second planar optical waveguide substrate 13 by an ion exchange method.
  • the single-mode optical waveguide 12 and the multi-mode waveguide 14 are coupled to the multi-mode optical fiber 4 in an adjacent state.
  • a circular core having a circular core formed by an ion exchange method is used, but a rectangular optical waveguide may be used.
  • FIG. 6 is a schematic view showing an asymmetrical optical power bra according to a third embodiment of the present invention.
  • Offset It is a light power plastic that combines a top-code 46 and a multi-mode evanescent light power bra 41.
  • the multi-mode evanescent optical power coupler 41 couples the optical signals of the multi-mode optical fibers 43 and 45 to the multi-mode optical fiber 44.
  • the evanescent optical power bra 41 is a device that couples optical signals between two optical fibers by disposing two multi-mode optical fiber cores in parallel and close proximity. This evanescent optical power brah is usually made by fusing two optical fibers, but can also be realized by a flat optical waveguide.
  • the offset patch cord 46 is connected to a single mode optical fiber 42 and a multimode optical fiber 45 in a state where the central axis is off.
  • This structure realizes the functions of selective excitation of higher-order modes and statistical effect optical isolation.
  • this structure alone does not have the function of a light power bra, so a light power bra is prepared separately.
  • a simple Y-shaped optical power bra is used as the optical power bra, the mode exchange between the lower-order mode and the higher-order mode occurs in the Y-branch optical waveguide, and the higher-order mode selective excitation effect occurs. Will be destroyed. Therefore, the transmission / reception optical signal is coupled to the multi-mode optical fiber 44 using the multi-mode evanescent optical power bra.
  • a multi-mode evanescent optical power plug is an optical power bra in which two multi-mode optical fiber core portions are closely arranged in parallel.
  • light is coupled by photon tunneling, in which case the ⁇ order mode optical signal of one multimode fiber is coupled to the corresponding higher order mode of the other multimode optical fiber. I do. Therefore, it is possible to combine the transmitted and received optical signals while maintaining the higher-order mode selective excitation.
  • the single mode optical fiber 42 shown in FIG. 6 corresponds to the station or the single mode optical fiber 2a or 2b of the station shown in FIG.
  • the multimode optical fiber 43 shown in FIG. 6 corresponds to the multimode optical fibers 3a and 3b of the station or the station in FIG.
  • the multimode optical fiber 44 shown in FIG. 6 corresponds to the multimode optical fiber 4a or 4b of the station or the station in FIG.
  • cent optical power bracket 41 As a modification of the third embodiment, as shown in FIG.
  • the connection relationship between the cent optical power bracket 41 and the multimode optical fiber 44 may be opposite to that in FIG.
  • FIG. 8 shows an embodiment of a wavelength multiplexing apparatus to which the asymmetric optical power blur of the present invention is applied.
  • This wavelength multiplexing device includes optical signal transceivers 33a to 33d for transmitting and receiving optical signals of different wavelengths, and a passive wavelength multiplexer 34.
  • the passive wavelength multiplexer 34 includes a single mode multiplexer 31, a multimode wavelength multiplexing module 32, and an asymmetric optical power blur 1 c.
  • the transmission optical signals of four different wavelengths from the optical signal transceivers 3 3 a to 3 3 d are multiplexed by a single mode multiplexer 31 and then sent to the asymmetric optical power bra 1 c.
  • the optical signal that is coupled to the transmission multimode optical fiber 36 and wavelength-multiplexed toward the partner station is transmitted.
  • the wavelength-multiplexed optical signal transmitted from the partner station via the transmission multimode optical fiber 36 is separated into individual wavelengths by using the asymmetric optical power amplifier 1c and the multimode wavelength multiplexing module 32. After that, it is sent to the optical signal transceivers 33a to 33d.
  • the optical signal transceivers 33a to 33d and the passive wavelength multiplexer 3 are connected by an optical fiber cable 35, and this optical fiber cable 35 has a single-mode optical fiber transmission line.
  • the receiving line is a multi-mode optical fiber.
  • FIG. 9 is a configuration perspective view showing an overview of the wavelength multiplexing apparatus of the present embodiment.
  • the optical signal transceivers 33 a to 33 d and the passive wavelength multiplexer 34 are provided as a unit in the main body (rack) of the wavelength multiplexing device 30.
  • the optical signal transceivers 33a to 33d and the passive wavelength multiplexer 34 are connected by the optical fiber cable 35 described above.
  • a multi-mode optical fiber for transmission 36 is connected to the passive wavelength multiplexer 34, and is connected to a partner station (not shown).
  • FIG. 10 shows the configuration of the optical fiber cable 35. It consists of optical connector 4 1a, single-mode optical connector 4 * 2, multi-mode optical connector 4 3 and optical connector 4 lb.
  • FIG. 11 shows a modification of the optical transceiver shown in the first embodiment. This is an example in which the optical transceiver shown in FIG. 4 is changed to a single mode optical fiber.
  • two stations, a station and a station are connected by a single-mode optical fiber 56 for transmission.
  • the station comprises a transmitting unit 21a, a receiving unit 22a, and an asymmetric single mode evanescent centrifugal light bra 5la.
  • the transmitting section 21a is connected with an asymmetric single-mode evanescent optical power bra 51a and a single-mode optical fiber 52a.
  • the receiving section 22a is connected by an asymmetric single-mode evanescent optical power bra 51a and a single-mode optical fiber 53a.
  • the output-side multi-mode optical fiber 54 a of the asymmetric single-mode evanescent optical power blur 51 a is connected to the transmission single-mode optical fiber 56.
  • the station comprises a transmitting section 21b, a receiving section 22b, and an asymmetric single-mode evanescent optical power blur 51b.
  • the transmitting section 21b is connected to the asymmetric single-mode evanescent optical power blur 51b and the single-mode optical fiber 52b.
  • the receiving section 22b is connected to the asymmetric single-mode evanescent optical power bra 51b and the single-mode optical fiber 53b.
  • the output-side single-mode optical fiber 54b of the asymmetric single-mode evanescent optical power blur 51b is connected to the single-mode optical fiber 56 for transmission.
  • Asymmetric single-mode evanescent cent centrifugal bras 5a to 5lb are chosen with a coupling coefficient of 10%. This means the degree of coupling in which an optical signal moves by 10% from one optical fiber core to another optical fiber core.
  • Fig. 12 shows the connection relationship between the asymmetric single mode evanescent optical power brass 51a and 51b and the single mode optical fiber 56 for transmission.
  • the receiving units of the stations # 1 and # 2 are connected to the single-mode optical fiber 56 for transmission with the asymmetric single-mode evanescent centrifuges 51 a to 51 b exhibiting large coupling.
  • the optical signal S from the station is coupled to the transmission single-mode optical fiber 56 only by 0.1 S via the asymmetric single-mode evanescent optical power bra 5 la.
  • Single-mode optical fiber for transmission 56 and asymmetric single-mode evanescent optical power After passing through 5 lb, an optical signal of 0.09 S propagates to the receiver of the first station.
  • an optical signal of 0.01 S propagates to the transmitter of the first station. Therefore! _ One-hundredth of the power of the original optical signal from the station will be sent to the transmitter of the station, preventing the transmitter of the station from being disturbed by the optical signal from the station. .
  • the optical signal of the partner station be reduced to 1/100 or less, but if it is 1/10 or less, disturbance of the transmission unit (mainly laser diode) due to optical signals from other stations should be prevented. Can be. Therefore, this configuration works effectively when the coupling coefficient is 33% or less.
  • the following three functions can be realized. That is, (1) the function of an optical power blur to realize bidirectional optical communication, and (2) the selective pumping that enables wideband transmission by eliminating the inter-mode delay (DMD) by selectively pumping only the higher-order modes. (3) Non-reciprocal element using statistical effect, function of statistical effect optical isolator.

Abstract

Selon la présente invention, une bande de transmission est améliorée lorsqu'une fibre optique plurimodale présentant une interruption dans la distribution d'indice de réfraction est utilisée. De plus, la communication par fibre optique bidirectionnelle est réalisée. Un coupleur optique asymétrique ayant un coefficient de couplage asymétrique, comprend un guide d'onde optique rectangulaire plan, un guide d'onde optique circulaire d'échange ionique, et un coupleur optique à ondes évanescentes plurimodal servant à coupler une fibre optique d'émission et une fibre optique de réception.
PCT/JP2001/007194 2000-08-31 2001-08-23 Coupleur optique asymetrique, emetteur-recepteur optique, et dispositif de multiplexage en longueur d'onde WO2002018995A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2001280111A AU2001280111A1 (en) 2000-08-31 2001-08-23 Asymmetric optical coupler, optical transceiver, and wavelength multiplexing device
JP2002523658A JPWO2002018995A1 (ja) 2000-08-31 2001-08-23 非対称型光カプラ、光送受信機、及び、波長多重化装置

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JP2000264573 2000-08-31
JP2000-264573 2000-08-31

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1345072A2 (fr) * 2002-03-04 2003-09-17 OpNext Japan, Inc. Modulateur optique du type Mach-Zehnder
JP2004053992A (ja) * 2002-07-22 2004-02-19 Hitachi Cable Ltd 回折格子、波長合分波器及びこれらを用いた波長多重信号光伝送モジュール
JP2006201555A (ja) * 2005-01-21 2006-08-03 Hitachi Cable Ltd マルチモード波長多重光トランシーバ
EP2472750A1 (fr) * 2010-12-30 2012-07-04 Nokia Siemens Networks Oy Système et procédé de réseau optique
US20190140764A1 (en) * 2014-12-11 2019-05-09 Corning Optical Communications Wireless Ltd Multiplexing two separate optical links with the same wavelength using asymmetric combining and splitting

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JPS62291604A (ja) * 1986-06-11 1987-12-18 Sumitomo Electric Ind Ltd 光分岐結合器
EP0361498A2 (fr) * 1988-09-30 1990-04-04 Fujitsu Limited Appareil pour connecter optiquement une fibre optique monomode à une fibre optique multimode
WO1997033390A1 (fr) * 1996-03-08 1997-09-12 Hewlett-Packard Company Systemes de communication multimodes
JPH10160980A (ja) * 1996-11-27 1998-06-19 Nec Corp 光送受信モジュール
JPH11183743A (ja) * 1997-12-19 1999-07-09 Hitachi Ltd 光分岐結合器及びそれを用いた光伝送装置
JPH11271548A (ja) * 1998-03-26 1999-10-08 Sharp Corp 双方向光通信器および双方向光通信装置
JP2000214345A (ja) * 1999-01-20 2000-08-04 Sharp Corp 光通信デバイスおよび双方向光通信装置

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Publication number Priority date Publication date Assignee Title
JPS62291604A (ja) * 1986-06-11 1987-12-18 Sumitomo Electric Ind Ltd 光分岐結合器
EP0361498A2 (fr) * 1988-09-30 1990-04-04 Fujitsu Limited Appareil pour connecter optiquement une fibre optique monomode à une fibre optique multimode
WO1997033390A1 (fr) * 1996-03-08 1997-09-12 Hewlett-Packard Company Systemes de communication multimodes
JPH10160980A (ja) * 1996-11-27 1998-06-19 Nec Corp 光送受信モジュール
JPH11183743A (ja) * 1997-12-19 1999-07-09 Hitachi Ltd 光分岐結合器及びそれを用いた光伝送装置
JPH11271548A (ja) * 1998-03-26 1999-10-08 Sharp Corp 双方向光通信器および双方向光通信装置
JP2000214345A (ja) * 1999-01-20 2000-08-04 Sharp Corp 光通信デバイスおよび双方向光通信装置

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1345072A2 (fr) * 2002-03-04 2003-09-17 OpNext Japan, Inc. Modulateur optique du type Mach-Zehnder
EP1345072A3 (fr) * 2002-03-04 2004-11-03 OpNext Japan, Inc. Modulateur optique du type Mach-Zehnder
JP2004053992A (ja) * 2002-07-22 2004-02-19 Hitachi Cable Ltd 回折格子、波長合分波器及びこれらを用いた波長多重信号光伝送モジュール
JP2006201555A (ja) * 2005-01-21 2006-08-03 Hitachi Cable Ltd マルチモード波長多重光トランシーバ
JP4586546B2 (ja) * 2005-01-21 2010-11-24 日立電線株式会社 マルチモード波長多重光トランシーバ
EP2472750A1 (fr) * 2010-12-30 2012-07-04 Nokia Siemens Networks Oy Système et procédé de réseau optique
WO2012089527A1 (fr) * 2010-12-30 2012-07-05 Nokia Siemens Networks Oy Système de réseau optique et procédé associé
US20190140764A1 (en) * 2014-12-11 2019-05-09 Corning Optical Communications Wireless Ltd Multiplexing two separate optical links with the same wavelength using asymmetric combining and splitting
US10659186B2 (en) * 2014-12-11 2020-05-19 Corning Optical Communications LLC Multiplexing two separate optical links with the same wavelength using asymmetric combining and splitting

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AU2001280111A1 (en) 2002-03-13

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