WO2002018995A1 - Asymmetric optical coupler, optical transceiver, and wavelength multiplexing device - Google Patents

Asymmetric optical coupler, optical transceiver, and wavelength multiplexing device 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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Prior art keywords
optical
optical fiber
mode
asymmetric
light
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PCT/JP2001/007194
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French (fr)
Japanese (ja)
Inventor
Takeshi Ota
Original Assignee
Photonixnet Kabushiki Kaisha
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Priority to JP2000264573 priority Critical
Priority to JP2000-264573 priority
Application filed by Photonixnet Kabushiki Kaisha filed Critical Photonixnet Kabushiki Kaisha
Publication of WO2002018995A1 publication Critical patent/WO2002018995A1/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/24Coupling light guides
    • G02B6/26Optical coupling means
    • G02B6/28Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804Optical 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
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/10Light guides of the optical waveguide type
    • G02B6/12Light guides of the optical waveguide type of the integrated circuit kind
    • G02B6/122Basic optical elements, e.g. light-guiding paths
    • G02B6/125Bends, branchings or intersections

Abstract

A transmission band is improved when a multi-mode optical fiber having a notch in a refractive index distribution is used. In addition, two-way optical fiber communication is realized. An asymmetric optical coupler having an asymmetric coupling coefficient includes a planar rectangular optical waveguide, an ion-exchange circular optical waveguide, and a multi-mode evanescent optical coupler thereby to couple a transmitting optical fiber and a receiving optical fiber.

Description

Bright fine manual asymmetric optical power bra, optical transceiver, and a wavelength multiplexer art

The present invention relates to an optical fiber first communication. To an optical force bra that is applied to two-way communication using a multi-mode optical fiber. BACKGROUND

Refractive index distribution is distributed index multimode one mode optical fiber is parabolic was laid in large quantities bought for optical communication of the building premises. Multimode optical file I bar produced in more than a 2.0 years, from the relationship between the time of preparation, what was often having a refractive index distribution called notch as shown in the first 3 FIG. The first 3 view (a) is a diagram showing an outline of a multi-mode optical fiber, the Z axis in FIG axial direction of the optical fiber (propagation direction of light), X-axis represents the radial direction of the optical Huai Ba ing. The first 3 view (b) is a diagram showing the refractive index distribution of a multimode optical fiber is also a diagram showing a notch. As can be seen from the first 3 view (b), Notsuchi the refractive index of the central portion of the core of the optical fiber indicates a value smaller than the ideal parabolic distribution.

When using multi-mode optical fiber having such Notsuchi light Faibako propagation velocity out optical path through the near § centered (low-order mode) optical path through the optical fiber core periphery and (髙次 mode) is different from and will issue mode delays (DMD: D ifferential M ode D e 1 ay), it occurs. Since the optical signal propagation speed of the light-path (mode) Niyotsu different light pulses distorted in time, the upper limit of the communication speed is not determined by the DMD.

It shows the concept of mode one de in the first 4 FIG distribution refractive multimode one mode optical fiber. In the first 4 view, Z-axis direction of the optical axis of the optical fiber, the X-axis shows the radial direction of the optical fiber. Light in distributed refractive multimode optical fiber proceeds a sine curve to draw memorial to the optical axis. Sign amplitude Carp small, light 1 0 1 proceeds only near the optical axis is a low-order mode one de, light 1 0 2 the amplitude of the sine Carp passes large core periphery is higher mode. Incidentally, the total number of modes in the core system 5 0-6 0 micron distributed refractive multimode optical fiber commonly used is present in the order of several hundred thousand. Moreover, so-called Shingurumo one mode optical fiber is the number of propagation possible modes is a single fiber optic. In the single-mode optical fiber mode one soil there is no problem of because it is one DMD. Thus a long-distance broadband transmission is single-mode optical Huai bar is laid favored for optical long-haul optical communications. However, the single-mode optical fiber for the core diameter as small as about 1 0 microns, has a drawback that the connection work is difficult. Therefore, the short-distance communication there are historical background that laid preferred by gradient index multimode optical fiber. Disclosure of the Invention

The present invention is inter-mode delay in multimode one mode optical fiber having the above-mentioned Notsuchi: aims to solve the (DMD D ifferential M ode D e 1 ay). In particular, it is an object to solve the inter-mode delay in the case of performing two-way optical communication over a single optical fiber. Also, In addition, also aims to prevent the transmission optical signal issues and Do that other station in bidirectional optical fiber communication optical transmission signal modulated in its own station and enters the laser light source of its own station is disturbed 攪to.

Asymmetric light force bra of the present invention in order to solve the above problems, the first and the optical signal of the second light Huai Ba an optical power bra to be bonded to the third optical fiber, the first and second Oite of the asymmetric optical power bra optical signal fiber optic bind at different coupling ratios to a third optical fiber, the first optical fiber is single-mode optical fiber, the second and third optical Huai Ba characterized in that it is composed of a multimode optical fiber.

Also includes a flat rectangular optical waveguide circuit, the width of the first rectangular waveguide corresponding to the first optical fiber is equal to or less than the width of the rectangular waveguide corresponding to the second optical fiber.

Then, in the flat rectangular optical waveguide circuit, coupled to the first of the first of the third optical fiber in a state where the rectangular waveguide is separated corresponding to the rectangular waveguide and a second optical fiber corresponding to the optical fiber characterized in that it.

Alternatively, it comprises a first flat plate-like rectangular optical waveguide circuit and a second plate-like rectangular optical waveguide circuit, the core diameter of the optical waveguide provided in the first flat plate-like rectangular optical waveguide circuit a second flat plate Jokoshirube core diameter Yori of the optical waveguide provided in the waveguide circuit is small, provided in close contact surfaces between the first and second planar optical waveguide circuit is provided is an optical waveguide, a third optical fiber characterized in that it binds to.

Alternatively, characterized by comprising the offsets Uz Topadzuchiko one de connected mutually offset center axes of single-mode and multimode optical fiber, a multimode one Doebanedzusento light force bra.

Further, the optical transceiver of the present invention, shall apply in optical transceiver having the asymmetric optical power bra, a light source to the first optical fiber, a light receiving element to a second optical fiber, the third light the transmission optical fiber in full multiplexing, characterized by being connected.

Alternatively, an optical receiver with the asymmetric optical power Bra, first by binding directly source the optical waveguide to be connected to an optical fiber, the light receiving element to an optical waveguide to be connected to a second optical fiber it was directly connected, characterized in that connecting the transmission optical fiber to the third optical fiber.

The wavelength multiplexing device of the present invention is provided with the asymmetric force bra, further single mode optical multiplexer and multimode and a one de wavelength multiplexing module, wherein the single mode optical multiplexer the different light sources with multiple wavelengths is bound by the multiplexer, a plurality of light receiving elements coupled by the multimode one de wavelength multiplexing module, further that the a Gurumo mode optical multiplexer and said wavelength multiplexing module was bound by the asymmetric optical power bra and features.

Further, the wavelength multiplexer of the present invention, together with Mokeraru optical transceiver different wavelengths of the multiple unit form, passive wavelength division multiplexer is provided in unit form, wherein the said different wavelength light transceiver a passive wavelength division multiplexer, characterized in that it is connected by an optical fiber cord which is provided in pairs and Shingurumo one mode optical fiber and a multimode optical fiber.

Further, the optical transceiver of the present invention includes a light source, a light receiving element, and a asymmetrical single-mode error panel Dzusento light force bra, the asymmetric single-mode error panel Dzusento light force bra, a first single-mode optical fiber the optical signal of the second Shingurumo one mode optical fiber, an optical power bra for coupling to the third single-mode fiber, coupling ratio of the first single-mode optical fiber and the third single-mode optical fiber (K 1) coupling ratio and the second single-mode optical fiber a third single mode optical fiber (K ​​2) are small (K 1 <K 2) structure than the light source to the first optical fiber , characterized in that said light receiving element to a second optical fiber, and the transmission Shingurumo Ichidokofu Aipa to a third optical fiber connected respectively.

In addition the optical transceiver, the first coupling ratio of a single-mode optical fiber and the third single-mode optical fiber and (K 1), the second single-mode optical file I bus and the third single-mode optical fiber the ratio of binding ratio (kappa 2) of, characterized in that it is a Κ 2 / Κ 1≥ 3.

Furthermore the proportion of the coupling ratio, characterized in that it is a Κ 2 / Κ 1≥ 1 0.

According to asymmetric optical power bra the above configuration, it is possible to realize the following three functions. : (1) function of the optical power bra for realizing bidirectional optical communication, (2) eliminating mode between delay (DMD) by only the selective excitation order mode selective excitation that allows broadband transmission function, (3) non-reciprocal device using the statistical effect is statistically effective light eye Soret evening function.

According to the wavelength multiplexing device having the above structure, it is possible that in the bidirectional optical signal transmission wavelength multiplexed by multimode one mode optical fiber, improving the transmission band.

According to the optical transceiver with the above configuration prevents the magneto-optical effect using an optical isolator evening that applies without having, the transmission light signal of one station would disturb the modulation of the light sources of the other stations it can, it is possible to realize a turn two-way optical communication.

Above and other aspects of the invention will be set forth in the claims hereinafter and are explained in detail. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a top view of an asymmetric optical power bra first embodiment of the present invention.

Figure 2 is a structural perspective view of an asymmetric optical power bra first embodiment of the present invention.

Figure 3 is a diagram for explaining the "spacing" in tabular rectangular waveguide path circuit used in asymmetric optical power bra first embodiment of the present invention.

4 is a diagram illustrating a bidirectional optical fiber communication system using an asymmetric optical power bra Figure 1.

Figure 5 is a structural perspective view of an asymmetric optical power bra second embodiment of the present invention. 6 is a schematic diagram illustrating an asymmetric optical power bra third embodiment of the present invention.

7 is a schematic diagram showing a modification of the asymmetric optical power bra third embodiment of the present invention. 8 is a schematic diagram showing a fourth embodiment of a wavelength multiplexing KaSo location to which the asymmetric optical power bra is an embodiment of the present invention.

9 is a configuration perspective view showing an overview of a wavelength multiplexer Y.

First 0 is a diagram showing a configuration of an optical fiber cable 35.

The first 1 is a diagram showing an optical transceiver according to a fifth embodiment of the present invention.

The first FIG. 2 is a 示図 asymmetric Shingurumo one Doepanedzusento light force bra 5 1 a to 5 1 b and the connection relationship of the transmission single mode optical fiber 5 6.

The first 3 is a drawing for explaining the Notsuchi present in the refractive index profile of a conventional laid down by the distributed index multimode optical fiber.

The first 4 is a diagram showing the concept of a mode in the distributed refractive multimode optical fiber. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, with reference to examples illustrating the present invention in detail. First Embodiment

It shows a top view of a first embodiment of the asymmetric optical power bra of the present invention in Figure 1. Further, in FIG. 2 shows a configuration perspective view of a first embodiment of the asymmetric optical power bra of the present invention. Thickness on flat rectangular optical waveguide substrate 1 is the waveguide width of different first rectangular waveguide 5 is a second quadrature Katachikoshirube waveguide 6 is provided with a constant. The first rectangular waveguide 5 core 7 of Shingurumo one mode optical file bar 2 is connected. The core 8 of the multimode optical fiber 3 is connected to a second rectangular waveguide 6. A first rectangular waveguide 5 and the second rectangular waveguide 6 remains in the separated state without merging, are connected to the core 9 of the multi-mode optical fiber 4. The "first rectangular waveguide 5 remains in the separated state without a second rectangular waveguide 6 to join" the first rectangular waveguide 5 as shown in FIG. 3 a second rectangular waveguide 6 DOO are spaced with a distance d at the end face of the flat rectangular optical waveguide substrate 1, it means that the d is d≥ 0.

FIG. 4 is a diagram showing a configuration of a bidirectional optical fiber communication system using an asymmetric optical power bra Figure 1. Two stations are connected by multi-mode optical fiber 2 6 stations Metropolitan station and power 5 for transmission.

Station, transmitting unit 2 1 a, the receiving unit 2 2 a, and, and one stand consists asymmetric optical power bra 1 a. Transmitting portion 2 1 a is connected with the asymmetric optical power bra 1 a single mode optical fiber 2 a. The receiving unit 2 2 a is connected with the asymmetric optical power bra 1 a and a multimode optical fiber 3 a. Output side multimode one mode optical fiber 4 a asymmetric optical power bra 1 a is connected to the multimode optical fiber 2 6 for transmission.

Similarly ^ station transmitting unit 2 1 b, the receiving unit 2 2 b, and stands Ri consists asymmetric optical power bra 1 b. Transmitting portion 2 1 b is connected with the asymmetric optical power bra 1 b and Shingurumo one mode optical Faino 2 b. The receiving unit 2 2 b is connected by the asymmetric optical power bra 1 b and multimode one mode optical fiber 3 b. Output side multimode one mode optical fiber 4 b asymmetric optical power bra 1 b is connected to the transmission multimode one mode optical fiber 2 6.

At a station, the optical signal from the transmitting unit 2 1 a by asymmetric optical power bra 1 a, binds only to higher order mode one de for feeding heat multimode one mode optical fiber 2 6. Since the optical signal is sufficiently long distance propagation for transmission multimode one mode optical fiber 2 6 is uniformly distributed in order mode one de of the transmission multimode one mode optical fiber 2 6, the peripheral portion of the optical fiber core of the optical energy formic one becomes uniform distributed form (ring-shaped distribution) enters the asymmetric optical power bra 1 b of b station. The majority of the light of the ring-shaped distribution is sent to the receiving unit 2 2 b through the multimode one mode optical fiber 3 b. Then, a small portion of the light ring distribution is sent coupled to the transmission unit 2 1 b in the single-mode optical full Aipa 2 b. Although the flow from the small pipe flows all the large pipe, flow from a large pipe Komu are flow small portion to the small pipe. This is a non-reciprocal phenomenon based on the statistical effects.

Heterologous semi phenomenon based on the statistical effect realizes the same function as a so-called optical isolators evening. The bidirectional optical fiber communication, optical transmission signal of the other station laser of the station - there is a problem that incident on the light source optical transmission signal modulated for the own station is disturbed, the conventional magneto-optical effect which the proof Gutame light isolators evening has been used is a non-reciprocal element utilizing. Asymmetric light force bra of the present invention can substantially realize the optical isolator evening the same function by different principles.

Note in the above, _ ^ has been described the flow of light signals from the station side to ^ the station side, it is possible to transmit the optical signal to the station side from just as the station side.

Asymmetric light force bra of the present invention as described above can be achieved following three functions simultaneously.

(1) a light force bra for realizing two-way optical communication function.

(2) high-order mode at a time only the selective excitation by eliminating inter-mode delay (DMD) by enabling broadband transmission by selecting excitation functions.

(3) non-reciprocal device using the statistical effect, statistical effects light isolator evening function.

Incidentally, single-mode optical fiber 2 a, 2 b, to omit the multi-mode optical fiber 3 a, 3 b, a light source (such as a laser one diode) Ya tabular rectangular waveguide substrate 1 of the light-receiving element shown in Figure 2 it may be directly coupled to. Second Embodiment

Figure 5 is a schematic perspective view showing an asymmetric optical power plug 1 0 of the second embodiment of the present invention. Although it constituted the asymmetric optical power bra using planar optical waveguide substrate thickness is a width different rectangular waveguide at a constant in the first embodiment, in this embodiment, two planar optical waveguide substrate 1 1 realizes the function equivalent to that of the first embodiment by bonding and 1 3. Single-mode optical waveguide 1 2 having a circular core is formed by an ion exchange method to the first upper planar optical waveguide substrate 1 1. On the other hand, on the second planar optical waveguide substrate 1 3 multimode one mode optical waveguide 1 4 having a circular core is formed by an ion exchange method. The single mode optical waveguide 1 2 and multimode one de waveguide 1 4 bound to multimode one mode optical fiber 4 in an adjacent state.

In the present embodiment was used with a circular core formed by an ion exchange method, it may be a rectangular waveguide.

Third Embodiment

Figure 6 is a schematic diagram illustrating an asymmetric optical power bra third embodiment of the present invention. Offset Topadzuchiko one de 4 6 and multimode an optical power plug that combines and one Doebanedzusento light force bra 4 1. Multimode one Doebanedzusento light power plug 4 1 binds to the optical signal of the multi-mode optical file bar 4 3 and 4 5 to the multi-mode optical fiber 4 4. Epanedzu St. light force bra 4 1 is a device for the coupling of optical signals between two optical fibers by parallel disposed close two multimode one mode optical fiber core. The E Banedzusento light force bra is usually made by fusing two optical fibers, but can also be realized by a flat plate-shaped optical waveguide. Offset patch cord 4 6 and the sheet Ngurumo one mode optical fiber 4 2 and a multimode optical fiber 4 5 are connected by a state of off-center axis. Selective excitation and statistical effect light eye Soret evening function of higher order modes is realized by this structure. However, only this structure because it does not have the function of light force bra, to prepare a light force bra separately. However, the use of simple Y-shaped optical power bra as light force bra, Y-branched light waveguide in by mode one de Replacing the lower order and higher modes are gone occurred, higher mode selective excitation effect There will be destroyed. Therefore, with each other to combine the transmitting and receiving optical signals to a multimode optical full multiplexing 4 4 with Ma Ruchimo one Doepanedzusento light force bra 4 1.

Multimode one Doebanedzusento light power plug as described above, a light force bra which is parallel arranged close to two multimode one mode optical fiber core. The evanescent light force flop La light is coupled by photon tunneling, in this case, the optical signal of 髙次 mode of one of the multimode optical full multiplexing is coupled to higher order modes of the corresponding order of the other multimode one mode optical fiber to. Therefore, while maintaining the high-order mode selective excitation, it is possible to perform the coupling of the transmitting and receiving Nobumitsu signal.

The asymmetric optical power bra third embodiment of the present invention for the applied if the fourth diagram of an optical transceiver will be described. Sixth single-mode optical fiber 4 2 shown in the figure correspond to the single-mode optical fiber 2 a to 2 b in our Keru station to station in Figure 4. Similarly, the multimode optical fiber 4 3 shown in FIG. 6 corresponding to 3 b to 3 a no station to station ^ multimode optical fiber in the fourth diagram. Then, the multi-mode optical fiber 4 4 shown in FIG. 6 corresponds to 4 b to 4 a no station or stations ^ the multimode one mode optical fiber in Figure 4.

Further, as a modification of the third embodiment, as shown in FIG. 7, a connection relationship between the multi-mode error spring Uz St. light force bra 4 1 and a multimode optical fiber 4 4, and Figure 6 opposition it may be.

Fourth Embodiment

As a fourth embodiment of the present invention, showing an embodiment of an asymmetric optical power Wavelength multiplexer according to the bra of the present invention in FIG. 8. The wavelength multiplexing device to no optical signal transceiver 3 3 a for sending and receiving optical signals of different wavelengths 3 3 d and consists passive wavelength division multiplexer 3 4. Passive wavelength division multiplexer 3 4 is a single-mode multiplexer 3 1, multi-mode wavelength-multiplexing module 3 2, and consists of asymmetrical optical power bra 1 c.

Four different wavelength transmission optical signal from to the optical signal transceiver 3 3 a free 3 3 d is sent after being combined by Shi Ngurumo one de multiplexer 3 1 to asymmetric optical power bra 1 c, the optical signal wavelength-multiplexed toward the other station is coupled to a transmission multimode optical fiber 3 6 is transmitted.

Separation into individual wavelength optical signal wavelength multiplexed sent through the multimode optical fiber 3 6 for transmission from the remote station is asymmetric optical power bra 1 c, a multimode wavelength multiplexing module 3 2 Te 絰3 3 a no optical signal transceiver from being to be sent to the 3 3 d. Have been connected by optical Faibake one table 35 to the optical signal transceiver 3 3 a to 3 3 d and passive wavelength division multiplexer 3, the optical fiber cable 35 is transmitted rays thin Gurumo one mode optical fiber , the receiving line has become a multi-mode optical fiber.

It shows a configuration perspective view showing an overview of a wavelength multiplexing device of this embodiment in FIG. 9. An optical signal transceiver 3 3 a to 3 3 d and passive wavelength division multiplexer 3 4 is provided as Yunidzu bets to the wavelength multi duplex device 3 0 of the body (the rack). Are connected by the optical fiber cable 35 described above and the optical signal transceiver 3 3 a to 3 3 d and passive wavelength division multiplexer 3 4. The passive wavelength division multiplexer 3 4 are connected with the opposite station to the multi-mode optical fiber 3 6 for transmission is connected (not shown).

It shows the structure of the optical fiber cable 35 to the first 0 FIG. Light connectors evening 4 1 a, the single-mode optical file * 4 2, the multimode optical file 4 3, One such scolded the optical connectors evening 4 lb. [Fifth Embodiment]

As a fifth embodiment of the present invention, the first 1 figure showing a modified example of the optical transceiver shown in the first embodiment. The optical transceiver shown in FIG. 4 is an example of changing for single mode optical fiber. In the first Figure 1, the two stations, and the stations Metropolitan Dan stations are connected by a single mode optical fiber 5 6 for transmission.

Station, transmitting unit 2 1 a, the receiving unit 2 2 a, and, and consists of an asymmetrical single-mode error spring Uz St. light force bra 5 la. Transmitting portion 2 1 a is connected with the asymmetric Shingurumo one Doebanedzusento light force bra 5 1 a and Shingurumo one mode optical fiber 5 2 a. The receiving unit 2 2 a is connected with the asymmetric single-mode error spring Uz St. light force bra 5 1 a single mode 'optical fiber 5 3 a. Output side multimode one mode optical fiber 5 4 a asymmetric Shingurumo one Doebanedzusento light force bra 5 1 a is connected to the transmission Shingurumo one mode optical fiber 5 6.

Similarly Dankyoku transmission unit 2 1 b, the receiving unit 2 2 b, and have established the asymmetric single-mode evaporator Ne Dzusento light force bra 5 1 b. Transmitting portion 2 1 b is connected with the asymmetric single-mode error spring Uz St. light force bra 5 1 b and Shingurumo one mode optical fiber 5 2 b. The receiving unit 2 2 b are connected in the asymmetric single-mode error spring Uz St. light force bra 5 1 b and the single mode optical fiber 5 3 b. Asymmetric single mode one Doepanedzusento light force bra 5 1 b output single-mode optical fiber 5 4 b of the is connected to a single mode optical fiber 5 6 for transmission.

Asymmetric single-mode error spring Dzusento light force bra 5 la to 5 lb is chosen coupling factor 1 0%. This optical signal is meant the degree of coupling to be moved by 1 0% to the other light Faibako § from one optical fiber core.

Shows an asymmetric single-mode error spring Uz St. light force bra 5 1 a to 5 1 b and the connection relationship of the transmission single mode optical fiber 5 6 First 2 FIG. Receiver of Λ station and Dankyoku asymmetrical single-mode error spring Uz to St. light force bra 5 1 a free 5 1 b is connected to the side indicated a significant binding to the transmission single mode optical fiber 5 6. As a result, an optical signal S from the station, via the asymmetric Shingurumo one Doepanedzusento light force bra 5 la, the transmission single mode optical fiber 5 6 0. Only 1 S binding. Through the single-mode optical fiber 5 6 and asymmetric Shingurumo one Doebanedzusento light force flops la 5 lb for transmission, the optical signal of 0. 09 S is propagated to the receiving unit of Dankyoku. Further, the optical signal of 0. 0 1 S is propagated to the transmission unit of Dankyoku. Therefore,! Is to the transmission unit of the _ station will be sent 1/100 of the power station or these original optical signal, it is possible to prevent the transmission of Dankyoku is disturbed by light signals of the station or al .

Although the above arrangement is the disadvantage that the received power is decreased slightly, indicating a large effect on the cost reduction of the short-range two-way communications device because it can omit the expensive optical isolation les Isseki.

Although it is desirable that the optical signal of the other station is reduced to 1/100 or less, as long as 1/1 0 following transmission unit according to an optical signal from the other station to prevent the (mainly laser one diode) disturbance can. Therefore, the coupling coefficient is present composed of the following 33% function effectively. Industrial Applicability

According to asymmetric optical power bra of the present invention, it is possible to realize the following three functions. : (1) function of the optical power bra for realizing bidirectional optical communication, (2) eliminating mode between delay (DMD) by only the selective excitation order mode selective excitation that allows broadband transmission function, (3) non-reciprocal device using the statistical effect is statistically effective light eye Soret evening function. Optical transceiver asymmetric optical power bra of the present invention, by using a wavelength multiplexing device, it is possible to realize transmission of a wide band low cost by the case of using a multimode one mode optical fiber.

Claims

The scope of the claims
1. The first and the optical signal of the second optical fiber an optical power bra to be bonded to the third optical fiber, coupling ratio of light signals of the first and second optical fibers are different from the third optical fiber in asymmetric optical power bra that binds in,
Asymmetric light power plug to the first optical fiber is characterized in that Shingurumo one mode optical fiber, the second and third optical fibers and a multimode optical fiber.
2. The first and the optical signal of the second optical fiber an optical power bra to be bonded to the third optical fiber, coupling ratio of light signals of the first and second optical fibers are different from the third optical fiber in asymmetric optical power bra that binds in,
Comprising a flat rectangular optical waveguide circuit, a non-symmetrical to the first width of the rectangular optical waveguide paths corresponding to the first optical fiber is equal to or less than the width of the rectangular waveguide corresponding to the second light Fuaipa light force bra.
3. The first and the optical signal of the second optical fiber an optical power bra to be bonded to the third optical fiber, coupling ratio of light signals of the first and second optical fibers are different from the third optical fiber in asymmetric optical power bra that binds in,
Comprising a flat rectangular optical waveguide circuit, coupled to the first of the first rectangular optical waveguide path and the third optical fiber in a state where the rectangular waveguide is separated corresponding to the second optical fiber corresponding to the optical fiber asymmetric light force bra, characterized in that.
4. The first and the optical signal of the second optical fiber an optical power bra to be bonded to the third optical fiber, coupling ratio of light signals of the first and second optical fibers are different from the third optical fiber in asymmetric optical power bra that binds in,
It comprises a first flat plate-like rectangular optical waveguide circuit and a second plate-like rectangular optical waveguide circuit, the core diameter of the optical waveguide provided in the first flat plate-like rectangular optical waveguide circuit a second planar optical waveguide circuit core diameter Yori of provided optical waveguide to be small, provided the first and second planar optical waveguide circuit in close contact surfaces between which is provided an optical waveguide, coupled to the third optical fiber asymmetric light force bra, characterized in that it is.
5. The first and the optical signal of the second optical fiber an optical power bra to be bonded to the third optical fiber, coupling ratio of light signals of the first and second optical fibers are different from the third optical fiber in asymmetric optical power plug for coupling in,
Asymmetric light force bra to the Ofusedzu short patch cord to Shingurumo one mode optical fiber and a multimode optical fiber were connected by shifting the center axis to each other, characterized in that example Bei a multimode one Doebanedzusento light force bra.
6. A claims 1 to optical transceiver having an asymmetric optical power bra 5, for transmitting a light source to the first optical fiber, a light receiving element to a second optical fiber, the third optical fiber optical transceiver, characterized in that the optical fiber was connected.
7. A claims 1 to optical transceiver having a fourth asymmetric optical power bra, a light source is bound directly to the optical waveguide to be connected to the first optical fiber to connect the second optical Huai Ba to the optical waveguide to connect the light receiving element directly, the optical transceiver being characterized in that connecting the transmission optical fiber to the third optical fiber.
8. A wavelength multiplexing device having an asymmetric optical power bra of claims 1 to 5, further Shingurumo a one mode optical multiplexer and a multimode wavelength division multiplexing module, wherein the different light sources with multiple wavelengths Shingurumo bound by a mode optical multiplexer, a plurality of light receiving elements coupled by the multi-mode wavelength-multiplexing module, further said wavelength multiplexing module Ichiru said Shingurumo one mode optical multiplexer to said asymmetric optical power bra connexion wavelength multiplexer and wherein the conjugated.
9. In a wavelength multiplexing device of claim 8,
Different light transceiver with Mokeraru multiple Yunitto shaped wavelength, passive wavelength division multiplexer is provided in Yuni' preparative shape, the different wavelengths of light transceiver and the passive wavelength division multiplexer is Shingurumo one wavelength multiplexing apparatus characterized by being connected by fiber optic cord provided and mode optical fiber and the multimode one mode optical fiber pairs.
10. source, the light receiving element, an asymmetric single-mode evanescent light force bra and optical transceiver that example Bei a,
The asymmetric Shingurumo one Doepanedzusento light force bra, the optical signal of the first Shingurumo one mode optical fiber and the second Shingurumo one mode optical fiber, an optical power bra to be bonded to the third Shingurumo one mode optical fiber , binding ratio of the first Shingurumo one mode optical fiber third single-mode fiber (K ​​1) is coupling ratio of the second single mode optical file I path and a third single mode optical fiber (K ​​2) are small (K 1 <K 2) structure than,
It said light source to the first optical fiber, said light receiving element to a second optical fiber, the optical transceiver, wherein the transmission single mode optical fiber was connected to a third optical fiber.
In 1 1. optical transceiver of claim 10,
Coupling ratio of the first Shingurumo one mode optical fiber and the third single-mode optical fiber (K ​​1) and, coupling ratio of the second single-mode optical fiber and a third single-mode optical full multiplexing (kappa 2) ratio of the light transmission and reception, which is a Κ 2 / Κ 1 3
12. The method of claim 1 1 of the optical transceiver further,
Coupling ratio of the first single-mode optical fiber and the third Shingurumo one mode optical fiber (K ​​1) and, coupling ratio of the second single-mode optical fiber and a third single-mode optical full multiplexing (kappa 2) ratio of the optical transmission receiver characterized in that it is a Κ 2 / Κ 1≥ 10.
PCT/JP2001/007194 2000-08-31 2001-08-23 Asymmetric optical coupler, optical transceiver, and wavelength multiplexing device WO2002018995A1 (en)

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AU8011101A AU8011101A (en) 2000-08-31 2001-08-23 Asymmetric optical coupler, optical transceiver, and wavelength multiplexing device
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PCT/JP2001/007194 WO2002018995A1 (en) 2000-08-31 2001-08-23 Asymmetric optical coupler, optical transceiver, and wavelength multiplexing device

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EP1345072A2 (en) * 2002-03-04 2003-09-17 OpNext Japan, Inc. Mach-zehnder optical modulator
JP2006201555A (en) * 2005-01-21 2006-08-03 Hitachi Cable Ltd Multimode wavelength multiplexing optical transceiver
EP2472750A1 (en) * 2010-12-30 2012-07-04 Nokia Siemens Networks Oy Optical network system and method

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JPS62291604A (en) * 1986-06-11 1987-12-18 Sumitomo Electric Ind Ltd Optical branching/coupling device
EP0361498A2 (en) * 1988-09-30 1990-04-04 Fujitsu Limited An apparatus for optically connecting a single-mode optical fiber to a multi-mode optical fiber
WO1997033390A1 (en) * 1996-03-08 1997-09-12 Hewlett-Packard Company Multimode communications systems
JPH10160980A (en) * 1996-11-27 1998-06-19 Nec Corp Optical transmission and reception module
JPH11183743A (en) * 1997-12-19 1999-07-09 Hitachi Ltd Optical branching/connecting unit and optical transmission equipment using the same
JPH11271548A (en) * 1998-03-26 1999-10-08 Sharp Corp Two-way optical communication unit, and two-way optical communication equipment
JP2000214345A (en) * 1999-01-20 2000-08-04 Sharp Corp Optical communication device and bi-directional optical communication equipment

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JPS62291604A (en) * 1986-06-11 1987-12-18 Sumitomo Electric Ind Ltd Optical branching/coupling device
EP0361498A2 (en) * 1988-09-30 1990-04-04 Fujitsu Limited An apparatus for optically connecting a single-mode optical fiber to a multi-mode optical fiber
WO1997033390A1 (en) * 1996-03-08 1997-09-12 Hewlett-Packard Company Multimode communications systems
JPH10160980A (en) * 1996-11-27 1998-06-19 Nec Corp Optical transmission and reception module
JPH11183743A (en) * 1997-12-19 1999-07-09 Hitachi Ltd Optical branching/connecting unit and optical transmission equipment using the same
JPH11271548A (en) * 1998-03-26 1999-10-08 Sharp Corp Two-way optical communication unit, and two-way optical communication equipment
JP2000214345A (en) * 1999-01-20 2000-08-04 Sharp Corp Optical communication device and bi-directional optical communication equipment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1345072A2 (en) * 2002-03-04 2003-09-17 OpNext Japan, Inc. Mach-zehnder optical modulator
EP1345072A3 (en) * 2002-03-04 2004-11-03 OpNext Japan, Inc. Mach-zehnder optical modulator
JP2006201555A (en) * 2005-01-21 2006-08-03 Hitachi Cable Ltd Multimode wavelength multiplexing optical transceiver
JP4586546B2 (en) * 2005-01-21 2010-11-24 日立電線株式会社 Multimode wavelength division multiplexing optical transceiver
EP2472750A1 (en) * 2010-12-30 2012-07-04 Nokia Siemens Networks Oy Optical network system and method
WO2012089527A1 (en) * 2010-12-30 2012-07-05 Nokia Siemens Networks Oy Optical network system and method

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AU8011101A (en) 2002-03-13

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