JP4586654B2 - Optical data transmission system and optical data transmission method - Google Patents

Description

The present invention relates to an optical data transmission system, an optical data bus, and an optical data transmission method that are suitable for data transmission between semiconductor chips such as LSI (Large Scale Integrated Circuit) .

  Conventionally, data transmission between semiconductor chips such as LSIs is performed by electrical signals via substrate wiring. However, with the recent increase in functionality of MPUs (Micro Processing Units), the amount of data exchanged between semiconductor chips has significantly increased, resulting in various high frequency problems such as RC (Register and Capacitor) signal delays. Impedance mismatching, EMC (ElectroMagnetic Compatibility) / EMI (ElectroMagnetic Interference), crosstalk, etc. are emerging.

  Conventionally, an optical data transmission technique using optical wiring has been developed in order to realize high speed and large capacity of data transmission. By performing data transmission between semiconductor chips using optical signals, there is no problem of RC delay as in electrical wiring, and transmission speed can be greatly improved. In addition, by performing data transmission between semiconductor chips using optical signals, it is possible to design wiring relatively freely without requiring any countermeasures against electromagnetic waves.

  Patent Document 1 describes an optical wavelength multiplex transmission system. In this optical wavelength division multiplex transmission system, when a node transmits data, the node confirms the address optical wavelength of the node to which the transmission data is to be transmitted, converts the data into an optical signal of this optical wavelength, and transmits the optical fiber transmission line. To send. In this optical wavelength division multiplex transmission system, when a node receives data, the node extracts received light from the optical fiber transmission line by extracting only light having a wavelength assigned as an address of the node.

Japanese Patent No. 2800481

  In the case where data communication between a plurality of nodes conventionally proposed including the optical wavelength multiplexing transmission method described in Patent Document 1 described above or data transmission between a plurality of semiconductor chips is performed by optical wiring, Each node or each semiconductor chip has a light emitting element, and has an expensive and complicated configuration.

  An object of the present invention is to enable each unit (node, semiconductor chip, etc.) to be configured inexpensively and easily without a light emitting element.

The concept of this invention is
Multiple units that send and receive data;
A first optical waveguide connecting the plurality of units and guiding light of a single wavelength or a plurality of wavelengths having no data information;
A ring-shaped second optical waveguide for guiding light of single or multiple wavelengths having data information, connecting the plurality of units;
Each of the plurality of units has at least one modulation function device and at least one light reception function device,
One or more modulation function device having the plurality of units each respectively, light of a predetermined wavelength modulated based on the value of the transmission data, to the first optical waveguide or found on Symbol second optical waveguide Guided,
At least one of the one or more light receiving function devices respectively included in the plurality of units obtains reception data by extracting light of a predetermined wavelength from the second optical waveguide and extracts from the second optical waveguide. An optical data transmission system having an adjustment mechanism for adjusting the ratio of light.

  In the present invention, a first optical waveguide that guides light of a single or a plurality of wavelengths not having data information, and a ring-shaped second waveguide that guides light of a single or a plurality of wavelengths having data information. An optical data bus is composed of the optical waveguide. Then, data transmission between units is performed using this optical data bus. For example, the plurality of units, the first optical waveguide, and the second optical waveguide are formed on the same substrate. Also, for example, the first optical waveguide and the second optical waveguide are embedded optical waveguides formed by a SIMOX (Separation by IMplanted OXygen) method.

  When transmitting data from the first unit to the second unit, the modulation function device of the first unit transmits light of a predetermined wavelength from the first optical waveguide to the second optical waveguide based on the transmission data. The light receiving functional device of the second unit that receives the light having a predetermined wavelength guided from the first optical waveguide by the first unit obtains received data by extracting the light from the second optical waveguide.

  As described above, each unit obtains light of a predetermined wavelength corresponding to transmission data using light of a single wavelength or a plurality of wavelengths guided by the first optical waveguide. It is not necessary to provide a light-emitting element, and therefore it can be configured inexpensively and easily.

  For example, the light guided by the modulation function device from the first optical waveguide to the second optical waveguide is light having a wavelength corresponding to another unit that performs communication. In this case, if the light of the wavelength is taken out by another unit, there is no need to add an address indicating the transmission destination unit to the transmission data, and the data area of the header part of the transmission data can be reduced. The substantial data transfer rate can be increased.

  Further, for example, light extracted from the second optical waveguide by the light receiving function device is light having a wavelength corresponding to another unit that performs communication. In this case, if the light of the wavelength is guided to the second optical waveguide by another unit, there is no need to add an address indicating the transmission source unit to the transmission data. The data area of the header portion can be reduced, and the substantial data transfer rate can be increased.

  Further, for example, each of the plurality of units has a light receiving function device that extracts and removes light guided to the second optical waveguide by the modulation function device from the second optical waveguide. In this case, the light guided to the second optical waveguide by the modulation function device of the predetermined unit makes a round and returns to the connection portion of the predetermined unit. Crosstalk with respect to light guided to the second optical waveguide by the device can be suppressed.

  Further, for example, a light receiving function device for obtaining received data has an adjustment mechanism for adjusting the ratio of light extracted from the second optical waveguide. In this case, if broadcast communication is always performed, the light receiving function device for obtaining the reception data in each unit is set so as to extract a part of the light of the corresponding wavelength from the second optical waveguide. By having an adjustment mechanism that adjusts the ratio of the light extracted from the second optical waveguide as described above, when point-to-point communication is performed, the light of the corresponding wavelength from the second optical waveguide. Can be set to extract all of the above, and reception sensitivity can be increased.

  In addition, for example, the modulation function device has an adjustment mechanism that adjusts the wavelength of light guided from the first optical waveguide to the second optical waveguide. In this case, when each unit guides light of a wavelength corresponding to the other unit that communicates to the second optical waveguide, the modulation function even if the number of units connected to the optical data bus increases. The number of devices can be reduced, and the circuit configuration can be simplified.

  Further, for example, a light receiving function device for obtaining received data has an adjustment mechanism for adjusting the wavelength of light extracted from the second optical waveguide. In this case, when each unit extracts light of a wavelength corresponding to another unit that communicates from the second optical waveguide, even if the number of units connected to the optical data bus increases, The number can be kept small, and the circuit configuration can be simplified.

According to the present invention, the first optical waveguide that guides light of a single or a plurality of wavelengths not having data information, and the ring-shaped second waveguide that guides a single or a plurality of lights having data information. When an optical waveguide is prepared and data is transmitted from the first unit to the second unit, the first unit transmits light of a predetermined wavelength modulated based on the value of transmission data to the first optical waveguide. guided into et second optical waveguide, the second unit, the light guided through the first optical waveguide by the first unit, with obtain received data is taken out from the second optical waveguide, the It has an adjusting mechanism for adjusting the ratio of light extracted from the second optical waveguide , and each unit can be configured inexpensively and easily without including a light emitting element.

  A first embodiment will be described. FIG. 1 shows a configuration of an optical data transmission system 100 as a first embodiment.

  The optical data transmission system 100 includes a plurality of units that perform data transmission and reception, four units 110 to 140 in this embodiment, optical waveguides 150 and 160 that connect these units 110 to 140, and 150 optical waveguides. And a light emitting unit 170 for inputting light of a predetermined wavelength.

  The optical waveguide 150 constitutes a first optical waveguide and connects a plurality of units 110 to 140. This optical waveguide 150 does not have data information, that is, data is null (invalid), single or plural wavelengths, in this embodiment, light of four wavelengths (λ1, λ2, λ3, λ4). It is a ring-shaped optical waveguide to guide. The light of the four wavelengths described above is supplied to the optical waveguide 150 from the light emitting unit 170. Here, the data-null light may be light that does not affect data as viewed from the data communication speed band, and may be continuous light or light that is modulated at high speed.

  The optical waveguide 160 constitutes a second optical waveguide and connects the plurality of units 110 to 140. The optical waveguide 160 is a ring-shaped optical waveguide that guides light of a single wavelength or a plurality of wavelengths having data information, in this embodiment, four wavelengths (λ1, λ2, λ3, λ4).

  The units 110 to 140 may be disposed on one semiconductor substrate or a general substrate, or may be discrete members. When these units 110 to 140 are discrete members, the optical waveguides 150 and 160 described above are configured by connecting the optical waveguides in each unit with an optical fiber or the like disposed between the units. In this case, there is a loss in the connection between the optical waveguide in the unit and the optical fiber between the units. Therefore, the performance is better when each unit is formed on the same substrate, more preferably on one semiconductor substrate. Cheap.

  The unit 110 includes an I / O device 111, a modulation function unit 112, and a light reception function unit 113. The modulation function unit 112 includes at least one modulation function device, in this embodiment, as shown in FIG. 2, three modulation function devices 112a, 112b, and 112c. In addition, the light receiving function unit 113 includes at least one light receiving function device, in this embodiment, one light receiving function device 113a as shown in FIG.

  Here, when light having wavelengths λ1, λ2, λ3, and λ4 is guided in the optical waveguide 150, the unit 110 uses light having a wavelength of λ2 when transmitting data to the unit 120, and the unit 130 When transmitting data to the unit 140, light having a wavelength of λ3 is used, and when transmitting data to the unit 140, light having a wavelength of λ4 is used. Each of the modulation function devices 112a, 112b, and 112c guides light having wavelengths λ2, λ3, and λ4 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. The unit 110 uses light having a wavelength of λ1 when receiving data from the unit 120, the unit 130, or the unit 140. The light receiving function device 113a extracts light having a wavelength of λ1 from the optical waveguide 160 to obtain received data.

  Each of the modulation function devices 112a to 112c and the light receiving function device 113a is configured by applying a microring resonator. Here, the basic principle of the microring resonator will be described.

  In FIG. 3, a linear optical waveguide 201 and a ring-shaped optical waveguide 202 are arranged close to each other. For example, when light having wavelengths λ1, λ2, λ3, and λ4 is guided in the optical waveguide 201, if the resonance wavelength of the waveguide 202 is λ2, the light having the wavelength λ2 is confined in the optical waveguide 202. The light having the wavelength of λ2 is excluded from the light guided through the optical waveguide 201.

  In FIG. 4, a ring-shaped optical waveguide 213 is disposed between two optical waveguides 211 and 212 that are parallel to each other in the vicinity of the optical waveguides 211 and 212. For example, when light having wavelengths of λ1, λ2, λ3, and λ4 is guided in the optical waveguide 211, assuming that the resonance wavelength of the optical waveguide 213 is λ2, the optical waveguide 213 causes the wavelength of λ2 from the optical waveguide 211. Light is extracted and guided to the optical waveguide 212.

  FIG. 5 shows a configuration example of the modulation function device 112a. The modulation function device 112a has a configuration in which two ring-shaped optical waveguides 11 and 12 are arranged in series between optical waveguides 150 and 160. Here, the resonance wavelength of the ring-shaped optical waveguide 11 is set to λ2.

  The ring-shaped optical waveguide 12 constitutes a modulator (MOD), and a heater 13 driven by transmission data TD to be transmitted to the unit 120 is disposed corresponding to the ring-shaped optical waveguide 12. The resonance wavelength of the ring-shaped optical waveguide 12 is basically set to λ2. For example, in the bit “1” or “0” of the transmission data TD, the heat of the heater 13 generates heat of the ring-shaped optical waveguide 12. The refractive index changes, and the resonance wavelength is shifted from λ2. Therefore, light having a wavelength of λ2 extracted from the optical waveguide 150 by the ring-shaped optical waveguide 11 is guided from the ring-shaped optical waveguide 12 to the optical waveguide 160 in a state modulated by the transmission data TD.

  Although detailed description is omitted, the modulation function devices 112b and 112c have the same configuration as the modulation function device 112a described above.

  FIG. 6 shows a configuration example of the light receiving function device 113a. The light receiving functional device 113a includes a ring-shaped optical waveguide 14 disposed in the vicinity of the optical waveguide 160, an arc-shaped optical waveguide 15 disposed in the vicinity of the ring-shaped optical waveguide 14, and the optical waveguide. 15 includes a light receiving element (PD) 16 that receives the light guided by 15. The resonance wavelength of the ring-shaped optical waveguide 14 is set to λ1.

  In this case, light having a wavelength of λ1 is guided from the optical waveguide 160 to the optical waveguide 15 by the ring-shaped optical waveguide 14. Then, light having a wavelength of λ 1 guided to the optical waveguide 15 is supplied to the light receiving element 16, and reception data RD is obtained from the light receiving element 16.

  Returning to FIG. 1, the unit 120 includes an I / O device 121, a modulation function unit 122, and a light reception function unit 123. The modulation function unit 122 includes at least one modulation function device, in this embodiment, as shown in FIG. 2, three modulation function devices 122a, 122b, and 122c. In addition, the light receiving function unit 123 includes at least one light receiving function device, in this embodiment, one light receiving function device 123a as shown in FIG.

  Here, when light having wavelengths λ1, λ2, λ3, and λ4 is guided in the optical waveguide 150, the unit 120 uses light having a wavelength of λ3 when transmitting data to the unit 130. When transmitting data to the unit 110, light having a wavelength of λ4 is used, and when transmitting data to the unit 110, light having a wavelength of λ1 is used. Each of the modulation function devices 122a, 122b, and 122c guides light having wavelengths λ3, λ4, and λ1 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. These modulation function devices 122a, 122b, and 122c are configured in the same manner as the modulation function device 112a (see FIG. 5) described above.

  The unit 120 uses light having a wavelength of λ2 when receiving data from the unit 130, the unit 140, or the unit 110. The light receiving function device 123a extracts light having a wavelength of λ2 from the optical waveguide 160 to obtain received data. The light receiving function device 123a is configured in the same manner as the light receiving function device 113a (see FIG. 6) described above.

  The unit 130 includes an I / O device 131, a modulation function unit 132, and a light reception function unit 133. The modulation function unit 132 includes at least one modulation function device, in this embodiment, as shown in FIG. 2, three modulation function devices 132a, 132b, and 132c. The light receiving function unit 133 has at least one light receiving function device, in this embodiment, as shown in FIG. 2, one light receiving function device 133a.

  Here, when light having wavelengths λ 1, λ 2, λ 3, and λ 4 is guided in the optical waveguide 150, the unit 130 uses light having a wavelength of λ 4 when transmitting data to the unit 140. When data is transmitted to the unit 120, light having a wavelength of λ1 is used. When data is transmitted to the unit 120, light having a wavelength of λ2 is used. Each of the modulation function devices 132a, 132b, and 132c guides light having wavelengths λ4, λ1, and λ2 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. These modulation function devices 132a, 132b, and 132c are configured in the same manner as the modulation function device 112a (see FIG. 5) described above.

  The unit 130 uses light having a wavelength of λ3 when receiving data from the unit 140, the unit 110, or the unit 120. The light receiving functional device 133a extracts light having a wavelength of λ3 from the optical waveguide 160 to obtain received data. The light receiving function device 133a is configured in the same manner as the light receiving function device 113a (see FIG. 6) described above.

  The unit 140 includes an I / O device 141, a modulation function unit 142, and a light receiving function unit 143. The modulation function unit 142 includes at least one modulation function device, in this embodiment, as shown in FIG. 2, three modulation function devices 142a, 142b, and 142c. In addition, the light receiving function unit 143 includes at least one light receiving function device, in this embodiment, one light receiving function device 143a as shown in FIG.

  Here, when light having wavelengths of λ1, λ2, λ3, and λ4 is guided in the optical waveguide 150, the unit 140 uses light of the wavelength of λ1 when transmitting data to the unit 110, and the unit 120 When transmitting data to the unit 130, light having a wavelength of λ2 is used, and when transmitting data to the unit 130, light having a wavelength of λ3 is used. Each of the modulation function devices 142a, 142b, and 142c guides light having wavelengths λ1, λ2, and λ3 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. These modulation function devices 142a, 142b, and 142c are configured in the same manner as the modulation function device 112a (see FIG. 5) described above.

  The unit 140 uses light having a wavelength of λ4 when receiving data from the unit 110, the unit 120, or the unit 130. The light receiving function device 143a extracts light having a wavelength of λ4 from the optical waveguide 160 to obtain received data. The light receiving function device 143a is configured similarly to the light receiving function device 113a (see FIG. 6) described above.

  Next, a description will be given of a method for forming the optical waveguides 150 and 160 and the optical waveguides that constitute the above-described modulation functional device and light receiving functional device. These optical waveguides can be formed, for example, as ridge-type optical waveguides formed on the surface or as SIMOX optical waveguides (embedded optical waveguides) formed immediately below the surface.

  With reference to FIG. 7, the manufacturing process of a ridge type | mold optical waveguide is demonstrated.

  First, as shown in FIG. 7A, an SOI (Silicon On Insulator) substrate 20 is prepared. This SOI substrate 20 is obtained by forming a silicon single crystal film (active silicon layer) 23 on a silicon substrate 21 via an insulator (box) 22, for example, a silicon oxide film.

  Next, as shown in FIG. 7B, a resist film 24 is applied on the silicon single crystal film 23 and patterned to generate a resist pattern 25 corresponding to the optical waveguide pattern as shown in FIG. 7C. .

  Next, using the resist pattern 25 as a mask, RIE (Reactive Ion Etching) is performed to form a ridge type optical waveguide 26 as shown in FIG. 7D. The resist pattern 25 is removed after etching.

  With reference to FIG. 8, the manufacturing process of the SIMOX optical waveguide will be described.

  First, as shown in FIG. 8A, an SOI substrate 30 is prepared. This SOI substrate 30 is obtained by forming a silicon single crystal film (active silicon layer) 33 on a silicon substrate 31 via an insulator (box) 32, for example, a silicon oxide film.

  Next, as shown in FIG. 8B, a silicon oxide film 34 is formed on the surface of the silicon single crystal film 33 by thermal oxidation. Then, patterning is performed to form a mask 35 made of silicon dioxide corresponding to the optical waveguide pattern, as shown in FIG. 8C.

  Next, as shown in FIG. 8D, oxygen ions are implanted with the mask 35 disposed on the silicon single crystal film 33. In this case, in the portion where the mask 35 is arranged, the ion velocity is reduced by the mask 35, so that oxygen ions are implanted shallowly, while in the portion where the mask 35 is not arranged, oxygen ions are implanted deeply.

  Next, as shown in FIG. 8E, the SOI substrate 30 in which oxygen ions are implanted into the silicon single crystal film 33 is subjected to a high temperature annealing treatment, and the implanted oxygen ions and silicon are reacted to form a silicon single crystal film 33. A silicon oxide film 36 is formed therein, and a SIMOX optical waveguide 37 is formed. Note that the mask 35 is removed before or after the annealing process, or after some annealing.

  As described above, the optical waveguides 150 and 160, and the optical waveguides constituting the above-described modulation functional device and light receiving functional device can be formed as a ridge-type waveguide or a SIMOX optical waveguide. In this embodiment, the optical waveguide 150 , 160 may cross a wide area of the silicon chip, so that more silicon is formed by the SIMOX optical waveguide formed immediately below the surface than when the ridge type optical waveguide is formed by the surface. Advantageously, the surface can be applied to an electrical circuit. Also, it is desirable to use a SIMOX optical waveguide in terms of loss.

  The operation of the optical data transmission system 100 shown in FIG. 2 will be described. Here, a case where data is transmitted from the unit 110 to the units 120, 130, and 140 will be described as an example.

  First, an operation when data is transmitted from the unit 110 to the unit 120 will be described. In this case, the transmission data TD is supplied from the device 111 of the unit 110 to the modulation function device 112a. Thereby, the light having the wavelength of λ2 is guided from the optical waveguide 150 to the optical waveguide 160 by the modulation function device 112a in a state modulated by the transmission data TD. In this case, in the light receiving function device 123a of the unit 120, light having a wavelength of λ2 is extracted from the optical waveguide 160, and the reception data RD corresponding to the transmission data TD from the device 111 of the unit 110 is received from the light receiving element. The received data RD is supplied to the device 121.

  Next, an operation when data is transmitted from the unit 110 to the unit 130 will be described. In this case, the transmission data TD is supplied from the device 111 of the unit 110 to the modulation function device 112b. As a result, light having a wavelength of λ3 is guided from the optical waveguide 150 to the optical waveguide 160 by the modulation function device 112b in a state modulated by the transmission data TD. In this case, in the light receiving function device 133a of the unit 130, light having a wavelength of λ3 is extracted from the optical waveguide 160, and the reception data RD corresponding to the transmission data TD from the device 111 of the unit 110 is received from the light receiving element. The received data RD is supplied to the device 131.

  Next, an operation when data is transmitted from the unit 110 to the unit 140 will be described. In this case, the transmission data TD is supplied from the device 111 of the unit 110 to the modulation function device 112c. Thereby, the light having the wavelength of λ4 is guided from the optical waveguide 150 to the optical waveguide 160 in a state modulated by the transmission data TD by the modulation function device 112c. In this case, in the light receiving function device 143a of the unit 140, light having a wavelength of λ4 is extracted from the optical waveguide 160, and the reception data RD corresponding to the transmission data TD from the device 111 of the unit 110 described above is extracted from the light receiving element. The received data RD is supplied to the device 141.

  Although not described, the operation when data is transmitted from the units 120, 130, and 140 to other units is the same as that when data is transmitted from the unit 110 to the other units.

  According to the optical data transmission system 100 shown in FIG. 2, each unit uses light of wavelengths λ1, λ2, λ3, and λ4 guided by an optical waveguide 150 to modulate a predetermined wavelength corresponding to transmission data. The light is obtained, and each unit does not need to be provided with a light emitting element, and thus can be configured inexpensively and easily.

  The light guided by the modulation function device of each unit from the optical waveguide 150 to the optical waveguide 160 is light having a wavelength corresponding to the other unit that performs communication, and the other unit extracts light of the wavelength. Therefore, it is not necessary to add an address indicating the transmission destination unit to the transmission data, the data area of the header portion of the transmission data can be reduced, and the substantial data transfer rate can be increased.

  In addition, communication is performed using light of a wavelength corresponding to the transmission destination unit, and a plurality of data communication with different transmission destinations can be performed in parallel, so that the data transmission density can be extremely increased. For example, data transmission from the unit 110 to the unit 120, data transmission from the unit 110 to the unit 130, and data transmission from the unit 110 to the unit 140 can be performed in parallel.

  Next explained is the second embodiment of the invention. FIG. 9 shows the configuration of an optical data transmission system 100A as the second embodiment. 9, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  This optical data transmission system 100A has units 110A to 140A instead of the units 110 to 140 of the optical data transmission system 100 shown in FIG.

  The unit 110 </ b> A has one modulation function device 114 as a modulation function unit, and the other configuration is the same as that of the unit 110.

  Here, when light having wavelengths λ1, λ2, λ3, and λ4 is guided through the optical waveguide 150, the unit 110A uses light having a wavelength of λ2 when transmitting data to the unit 120A, and the unit 130A. When transmitting data to the unit 140A, light having a wavelength of λ3 is used. When transmitting data to the unit 140A, light having a wavelength of λ4 is used. The modulation function device 114 guides light having wavelengths λ2, λ3, and λ4 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data.

  The modulation function device 114 is configured by applying the above-described microring resonator. FIG. 10 shows a configuration example of the modulation function device 114. The modulation function device 114 has a configuration in which two ring-shaped optical waveguides 41 and 42 are disposed in series between the optical waveguides 150 and 160.

  Here, the ring-shaped optical waveguide 41 has a wavelength adjustment mechanism (tuner TUN). That is, a heater 43 driven by the control data CD from the device 111 is disposed corresponding to the ring-shaped optical waveguide 41. The resonance wavelength of the ring-shaped optical waveguide 41 is changed according to the unit to which data is to be transmitted by changing the refractive index of the ring-shaped optical waveguide 41 by the heat generated by the heater 43. For example, the resonance wavelength of the ring-shaped optical waveguide 41 is λ2 when data is transmitted to the unit 120A, is λ3 when data is transmitted to the unit 130A, and is transmitted when data is transmitted to the unit 140A. Is λ4.

  The ring-shaped optical waveguide 42 constitutes a modulator (MOD), and a heater 44 driven by the transmission data TD is disposed corresponding to the ring-shaped optical waveguide 42. The ring-shaped optical waveguide 42 is set so as to include λ2, λ3, and λ4 in its resonance wavelength. The refractive index of the optical waveguide 42 changes, and the resonance wavelength is shifted from the set value. Therefore, light having a wavelength of λ2, λ3, or λ4 extracted from the optical waveguide 150 by the ring-shaped optical waveguide 11 is guided from the ring-shaped optical waveguide 42 to the optical waveguide 160 in a state modulated by the transmission data TD. The

  The unit 120A includes one modulation function device 124 as a modulation function unit, and the other configuration is the same as that of the unit 120.

  Here, when light having wavelengths λ1, λ2, λ3, and λ4 is guided through the optical waveguide 150, the unit 120A uses light having a wavelength of λ3 when transmitting data to the unit 130A, and the unit 140A When transmitting data to, light having a wavelength of λ4 is used, and when transmitting data to the unit 110A, light having a wavelength of λ1 is used. The modulation function device 124 guides light having wavelengths λ3, λ4, and λ1 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. The modulation function device 124 is configured in the same manner as the modulation function device 114 (see FIG. 10) described above.

  The unit 130A has one modulation function device 134 as a modulation function unit, and the other configuration is the same as that of the unit 130.

  Here, when light having the wavelengths λ1, λ2, λ3, and λ4 is guided in the optical waveguide 150, the unit 130A uses the light having the wavelength of λ4 when transmitting data to the unit 140A, and the unit 110A. When transmitting data to the unit 120A, light having a wavelength of λ1 is used. When transmitting data to the unit 120A, light having a wavelength of λ2 is used. The modulation function device 134 guides light having wavelengths λ4, λ1, and λ2 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. The modulation function device 134 is configured in the same manner as the modulation function device 114 (see FIG. 10) described above.

  The unit 140A includes one modulation function device 144 as a modulation function unit, and the other configuration is the same as that of the unit 140.

  Here, when light having wavelengths λ1, λ2, λ3, and λ4 is guided in the optical waveguide 150, the unit 140A uses light having a wavelength of λ1 to transmit data to the unit 110A, and the unit 120A When transmitting data to the unit 130A, light having a wavelength of λ2 is used. When transmitting data to the unit 130A, light having a wavelength of λ3 is used. The modulation function device 144 guides light having wavelengths λ1, λ2, and λ3 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. The modulation function device 144 is configured in the same manner as the modulation function device 114 (see FIG. 10) described above.

  The operation of the optical data transmission system 100A shown in FIG. 9 will be described. Here, a case where data is transmitted from unit 110A to units 120A, 130A, and 140A will be described as an example.

  First, an operation when data is transmitted from the unit 110A to the unit 120A will be described. In this case, control data CD for setting the resonance wavelength of the ring-shaped optical waveguide 41 to λ2 is supplied from the device 111 of the unit 110A to the modulation function device 114. Further, transmission data TD is supplied from the device 111 of the unit 110A to the modulation function device 114. Thereby, the light having the wavelength of λ2 is guided from the optical waveguide 150 to the optical waveguide 160 by the modulation function device 114 in a state where the light is modulated by the transmission data TD. In this case, in the light receiving function device 123a of the unit 120A, light having a wavelength of λ2 is extracted from the optical waveguide 160, and reception data RD corresponding to the transmission data TD from the device 111 of the unit 110A described above is extracted from the light receiving element. The received data RD is supplied to the device 121.

  Next, an operation when data is transmitted from the unit 110A to the unit 130A will be described. In this case, control data CD for setting the resonance wavelength of the ring-shaped optical waveguide 41 to λ3 is supplied from the device 111 of the unit 110A to the modulation function device 114. Further, transmission data TD is supplied from the device 111 of the unit 110A to the modulation function device 114. Accordingly, the light having the wavelength of λ3 is guided from the optical waveguide 150 to the optical waveguide 160 by the modulation function device 114 in a state where the light is modulated by the transmission data TD. In this case, in the light receiving function device 133a of the unit 130A, light having a wavelength of λ3 is extracted from the optical waveguide 160, and the reception data RD corresponding to the transmission data TD from the device 111 of the unit 110A is received from the light receiving element. The received data RD is supplied to the device 131.

  Next, an operation when data is transmitted from the unit 110A to the unit 140A will be described. In this case, control data CD for setting the resonance wavelength of the ring-shaped optical waveguide 41 to λ4 is supplied from the device 111 of the unit 110A to the modulation function device 114. Further, transmission data TD is supplied from the device 111 of the unit 110A to the modulation function device 114. Thereby, the light having the wavelength of λ4 is guided from the optical waveguide 150 to the optical waveguide 160 by the modulation function device 114 in a state modulated by the transmission data TD. In this case, in the light receiving function device 143a of the unit 140A, light having a wavelength of λ4 is extracted from the optical waveguide 160, and the reception data RD corresponding to the transmission data TD from the device 111 of the unit 110A described above is extracted from the light receiving element. The received data RD is supplied to the device 141.

  Although not described, the operation when data is transmitted from the units 120A, 130A, and 140A to other units is the same as that when data is transmitted from the unit 110A to the other units.

  According to the optical data transmission system 100A shown in FIG. 9, the same effect as that of the optical data transmission system 100 shown in FIG. 2 can be obtained, and the number of modulation function devices constituting the modulation function unit of each unit is one. The circuit configuration can be simplified.

  In addition, according to the optical data transmission system 100A shown in FIG. 9, the number of modulation function devices constituting the modulation function unit of each unit is one, but one is 1 as the structure shown in FIG. It is also possible to correspond to two wavelengths, and the other corresponds to two wavelengths as shown in FIG. 10, and the modulation function part of each unit can be constituted by a total of two modulation function devices. In general, in an optical data transmission system composed of n units, a modulation function device having a configuration as shown in FIG. 10 is used, so that the modulation function unit of each unit is configured with fewer than n−1 modulation function devices. The circuit configuration can be simplified.

  In addition, according to the optical data transmission system 100A shown in FIG. 9, the number of modulation function devices constituting the modulation function unit of each unit is one, but by providing another same modulation function device. The standby time when wavelength adjustment takes time can be shortened.

  Next explained is the third embodiment of the invention. FIG. 11 shows a configuration of an optical data transmission system 100B as the third embodiment. In FIG. 11, parts corresponding to those in FIG. 9 are denoted by the same reference numerals, and detailed description thereof is omitted.

  This optical data transmission system 100B has units 110B to 140B instead of the units 110A to 140A of the optical data transmission system 100A shown in FIG.

  The unit 110B has one light receiving function device 115 as a light receiving function unit, and the other parts have the same configuration as the unit 110A.

  Here, the unit 110B uses light having a wavelength of λ1 when receiving data from the unit 120B, the unit 130B, or the unit 140B. The light receiving function device 115 extracts light having a wavelength of λ1 from the optical waveguide 160 to obtain received data.

  The light receiving function device 115 is configured by applying the above-described micro ring resonator. FIG. 12 shows a configuration example of the light receiving function device 115. The light receiving functional device 115 includes a ring-shaped optical waveguide 51 disposed close to the optical waveguide 160, an arc-shaped optical waveguide 52 disposed close to the ring-shaped optical waveguide 51, and the optical waveguide. And a light receiving element (PD) 53 for receiving the light guided by 52.

  Here, the ring-shaped optical waveguide 51 has a wavelength adjustment mechanism (tuner TUN). That is, a heater 54 driven by the control data CD from the device 111 is disposed corresponding to the ring-shaped optical waveguide 51. The resonance wavelength of the ring-shaped optical waveguide 51 is changed to the wavelength corresponding to the unit 110B, in this embodiment, the wavelength of λ1 by changing the refractive index of the ring-shaped optical waveguide 51 by the heat generated by the heater 54.

  In this case, light having a wavelength of λ1 is guided from the optical waveguide 160 to the optical waveguide 52 by the ring-shaped optical waveguide 51. Then, light having a wavelength of λ 1 guided to the optical waveguide 52 is supplied to the light receiving element 53, and reception data RD is obtained from the light receiving element 53.

  The unit 120B has one light receiving function device 125 as a light receiving function unit, and the other parts have the same configuration as the unit 120A. Here, the unit 120B uses light having a wavelength of λ2 when receiving data from the unit 130B, the unit 140B, or the unit 110B. The light receiving function device 125 extracts light having a wavelength of λ2 from the optical waveguide 160 to obtain received data. The light receiving function device 125 is configured in the same manner as the light receiving function device 115 (see FIG. 12) described above.

  The unit 130B has one light receiving function device 135 as a light receiving function unit, and the rest is configured similarly to the unit 130A. Here, the unit 130B uses light having a wavelength of λ3 when receiving data from the unit 140B, the unit 111B, or the unit 120B. The light receiving function device 135 extracts light having a wavelength of λ3 from the optical waveguide 160 to obtain received data. The light receiving function device 135 is configured similarly to the light receiving function device 115 (see FIG. 12) described above.

  The unit 140B has one light receiving function device 145 as a light receiving function unit, and the other parts have the same configuration as the unit 140A. Here, the unit 140B uses light having a wavelength of λ4 when receiving data from the unit 110B, the unit 120B, or the unit 130B. The light receiving function device 145 extracts light having a wavelength of λ4 from the optical waveguide 160 to obtain received data. The light receiving function device 145 is configured in the same manner as the light receiving function device 115 (see FIG. 12) described above.

  The operation of the optical data transmission system 100B shown in FIG. 11 is the same as that of the optical data transmission system 100A shown in FIG.

  According to the optical data transmission system 100B shown in FIG. 11, the same effects as those of the optical data transmission system 100A shown in FIG. It is equipped with a wavelength adjustment mechanism that adjusts the wavelength of the light extracted from the unit, and when the system expandability is required, such as when increasing the number of units, it is possible to avoid competition with the resonance wavelength of the existing light receiving function device .

  Next explained is the fourth embodiment of the invention. FIG. 13 shows a configuration of an optical data transmission system 100C as the fourth embodiment. In FIG. 13, portions corresponding to those in FIG. 11 are denoted by the same reference numerals, and detailed description thereof is omitted.

  This optical data transmission system 100C has units 110C to 140C instead of the units 110B to 140B of the optical data transmission system 100B shown in FIG.

  The unit 110C has one light receiving function device 118 as a light receiving function unit, and the other is configured similarly to the unit 110B.

  Here, the unit 110C uses light having a wavelength of λ1 when receiving data from the unit 120C, the unit 130C, or the unit 140C. The light receiving function device 118 extracts light having a wavelength of λ1 from the optical waveguide 160 to obtain received data.

  The light receiving function device 118 is configured to apply the above-described micro ring resonator. FIG. 14 shows a configuration example of the light receiving function device 118. The light receiving function device 118 includes a ring-shaped optical waveguide 61 disposed in the vicinity of the optical waveguide 160, a ring-shaped optical waveguide 62 disposed in the vicinity of the ring-shaped optical waveguide 61, and the ring-shaped optical waveguide. An arc-shaped optical waveguide 63 disposed in the vicinity of the waveguide 62 and a light receiving element (PD) 64 for receiving the light guided by the optical waveguide 63.

  Here, the ring-shaped optical waveguide 61 has a wavelength adjustment mechanism (tuner TUN). That is, a heater 65 driven by the control data CD1 from the device 111 is disposed corresponding to the ring-shaped optical waveguide 61. The resonance wavelength of the ring-shaped optical waveguide 61 is set to a wavelength corresponding to the unit 110C, that is, a wavelength of λ1 in this embodiment by changing the refractive index of the ring-shaped optical waveguide 61 by the heat generation of the heater 65.

  The ring-shaped optical waveguide 62 has a ratio adjusting mechanism (attenuator ATT) that adjusts the ratio of light to be extracted. That is, a heater 66 driven by the control data CD2 from the device 111 is disposed corresponding to the ring-shaped optical waveguide 62. By changing the refractive index of the ring-shaped optical waveguide 62 by the heat generated by the heater 66, the resonance wavelength of the ring-shaped optical waveguide 62 can be shifted from the wavelength corresponding to the unit 110C, that is, the wavelength of λ1 in this embodiment. it can.

  In this case, light having a wavelength of λ1 is guided from the optical waveguide 160 to the optical waveguide 63 at a predetermined ratio by the ring-shaped optical waveguides 61 and 62. Then, light having a wavelength of λ 1 guided to the optical waveguide 63 is supplied to the light receiving element 64, and reception data RD is obtained from the light receiving element 64.

  The unit 120C has one light receiving function device 128 as a light receiving function unit, and the other parts have the same configuration as the unit 120B. Here, when receiving data from the unit 130C, the unit 140C, or the unit 110C, the unit 120C uses light having a wavelength of λ2. The light receiving function device 128 extracts light having a wavelength of λ2 from the optical waveguide 160 to obtain received data. The light receiving function device 128 is configured in the same manner as the light receiving function device 118 (see FIG. 14) described above.

  The unit 130C has one light receiving function device 138 as a light receiving function unit, and the other parts have the same configuration as the unit 130B. Here, the unit 130C uses light having a wavelength of λ3 when receiving data from the unit 140C, the unit 110C, or the unit 120C. The light receiving function device 138 extracts light having a wavelength of λ3 from the optical waveguide 160 to obtain received data. The light receiving function device 138 is configured in the same manner as the light receiving function device 118 (see FIG. 14) described above.

  The unit 140C has one light receiving function device 148 as a light receiving function unit, and the rest is configured similarly to the unit 140B. Here, the unit 140C uses light having a wavelength of λ4 when receiving data from the unit 110C, the unit 120C, or the unit 130C. The light receiving function device 148 extracts light having a wavelength of λ4 from the optical waveguide 160 to obtain received data. The light receiving function device 148 is configured in the same manner as the light receiving function device 118 (see FIG. 14) described above.

  The operation of the optical data transmission system 100C shown in FIG. 13 is the same as that of the optical data transmission system 100B shown in FIG.

  According to the optical data transmission system 100C shown in FIG. 13, the same effects as those of the optical data transmission system 100B shown in FIG. 11 can be obtained. Furthermore, according to the optical data transmission system 100C shown in FIG. 13, since the light receiving function device of each unit has a ratio adjustment mechanism, for example, a broadcast type that sends the same data from a predetermined unit to all other units. The data communication can be performed satisfactorily.

  For example, when the same data is sent from the unit 110C to the other units 120C, 130C, and 140C, the light receiving function devices 128, 138, and 148 of the units 120C, 130C, and 140C respectively extract light having a wavelength of λ1 from the optical waveguide 160. As described above, the wavelength is adjusted by the wavelength adjusting mechanism. The light receiving function devices 148, 138, and 128 are adjusted so as to extract, for example, 30%, 50%, and 100%, respectively, of light having a wavelength of λ1 guided by the optical waveguide 160 by the ratio adjusting mechanism. Thereby, the light receiving function devices 128, 138, and 148 of the units 120C, 130C, and 140C can respectively extract the light having the wavelength of λ1 from the optical waveguide 160, and can obtain the data transmitted from the unit 110C.

  Next explained is the fifth embodiment of the invention. FIG. 15 shows a configuration of an optical data transmission system 100D as the fifth embodiment. In FIG. 15, parts corresponding to those in FIG.

  This optical data transmission system 100D has units 110D to 140D instead of the units 110A to 140A of the optical data transmission system 100A shown in FIG.

  The unit 110D has one modulation function device 116 as a modulation function unit, and four light reception function devices 117a to 117d as light reception function units.

  Here, when light having wavelengths λ1, λ2, λ3, and λ4 is guided through the optical waveguide 150, the unit 110D uses light having a wavelength of λ1 when transmitting data to other units. The modulation function device 116 guides light having a wavelength of λ1 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. The modulation function device 116 is configured in the same manner as the modulation function device 112a (see FIG. 5) described above.

  The unit 110D uses light having a wavelength of λ2 when receiving data from the unit 120D, uses light having a wavelength of λ3 when receiving data from the unit 130D, and receives data from the unit 140D. Uses light having a wavelength of λ4. The light receiving function devices 117a, 117b, and 117c take out light of wavelengths λ2, λ3, and λ4 from the optical waveguide 160, respectively, and obtain received data.

  These light receiving function devices 117a, 117b, and 117c are respectively configured in the same manner as the light receiving function device 113a (see FIG. 6) described above. However, these light receiving functional devices 117a, 117b, and 117c extract light of wavelengths [lambda] 2, [lambda] 3, and [lambda] 4 guided by the optical waveguide 160 by a certain ratio, for example, 30%, 50%, and 100%, respectively. Set to As a result, the light having the wavelength of λ2 from the unit 120D can be extracted by the downstream units 140D and 130D, and the light having the wavelength of λ3 from the unit 130D can be extracted by the downstream unit 140D. .

  The light receiving functional device 117d takes out light having a wavelength of λ1 from the optical waveguide 160 and removes it. The light receiving functional device 117d is configured in the same manner as the above-described light receiving functional device 113a (see FIG. 6), and is set so as to extract all light having a wavelength of λ1 guided by the optical waveguide 160. The light guided to the optical waveguide 160 by the modulation function device 116 of the unit 110D goes around the optical waveguide 160 and returns to the connection location of the unit 110D. As described above, light having a wavelength of λ1 is extracted from the optical waveguide 160 by the light receiving function device 117d, so that crosstalk with respect to the light having the wavelength of λ1 guided to the optical waveguide 160 by the modulation function device 116 is suppressed. be able to.

  The unit 120D has one modulation function device 126 as a modulation function unit, and four light reception function devices 127a to 127d as light reception function units.

  Here, when light having wavelengths λ1, λ2, λ3, and λ4 is guided through the optical waveguide 150, the unit 120D uses light having a wavelength of λ2 when transmitting data to other units. The modulation function device 126 guides light having a wavelength of λ2 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. The modulation function device 126 is configured in the same manner as the modulation function device 112a (see FIG. 5) described above.

  The unit 120D uses light having a wavelength of λ3 when receiving data from the unit 130D, uses light having a wavelength of λ4 when receiving data from the unit 140D, and receives data from the unit 110D. Uses light having a wavelength of λ1. The light receiving function devices 127a, 127b, and 127c extract the light having the wavelengths λ3, λ4, and λ1 from the optical waveguide 160, respectively, and obtain received data.

  Each of the light receiving function devices 127a, 127b, and 127c is configured similarly to the light receiving function device 113a (see FIG. 6) described above. However, these light receiving functional devices 127a, 127b, and 127c extract light of wavelengths λ3, λ4, and λ1 guided by the optical waveguide 160 by a certain ratio, for example, 30%, 50%, and 100%, respectively. Set to As a result, light having a wavelength of λ3 from the unit 130D can be extracted by the downstream units 110D and 140D, and light having a wavelength of λ4 from the unit 140D can be extracted by the downstream unit 110D. .

  The light receiving functional device 127d takes out light having a wavelength of λ2 from the optical waveguide 160 and removes it. The light receiving functional device 127d is configured in the same manner as the above-described light receiving functional device 113a (see FIG. 6), and is set so as to extract all light having a wavelength of λ2 guided by the optical waveguide 160. The light guided to the optical waveguide 160 by the modulation function device 126 of the unit 120D goes around the optical waveguide 160 and returns to the connection location of the unit 120D. As described above, light having a wavelength of λ2 is extracted from the optical waveguide 160 by the light receiving function device 127d, so that crosstalk with respect to the light having the wavelength of λ2 guided to the optical waveguide 160 by the modulation function device 126 is suppressed. be able to.

  The unit 130D has one modulation function device 136 as a modulation function unit, and four light reception function devices 137a to 137d as light reception function units.

  Here, when light having wavelengths λ1, λ2, λ3, and λ4 is guided in the optical waveguide 150, the unit 130D uses light having a wavelength of λ3 when transmitting data to other units. The modulation functional device 136 guides light having a wavelength of λ3 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. The modulation function device 136 is configured in the same manner as the modulation function device 112a (see FIG. 5) described above.

  The unit 130D uses light having a wavelength of λ4 when receiving data from the unit 140D, uses light having a wavelength of λ1 when receiving data from the unit 110D, and receives data from the unit 120D. Uses light having a wavelength of λ2. The light receiving function devices 137a, 137b, and 137c take out light of wavelengths λ4, λ1, and λ2 from the optical waveguide 160, respectively, and obtain received data.

  These light receiving function devices 137a, 137b, and 137c are respectively configured in the same manner as the light receiving function device 113a (see FIG. 6) described above. However, these light receiving functional devices 137a, 137b, and 137c extract light of wavelengths [lambda] 4, [lambda] 1, and [lambda] 2 guided by the optical waveguide 160 by a certain ratio, for example, 30%, 50%, and 100%, respectively. Set to As a result, light having a wavelength of λ4 from the unit 140D can be extracted by the downstream units 120D and 110D, and light having a wavelength of λ1 from the unit 110D can be extracted by the downstream unit 120D. .

  The light receiving function device 137d extracts and removes light having a wavelength of λ3 from the optical waveguide 160. The light receiving functional device 137d is configured in the same manner as the above-described light receiving functional device 113a (see FIG. 6), and is set so as to extract all light having a wavelength of λ3 guided by the optical waveguide 160. The light guided to the optical waveguide 160 by the modulation function device 136 of the unit 130D goes around the optical waveguide 160 and returns to the connection location of the unit 130D. As described above, light having a wavelength of λ3 is extracted from the optical waveguide 160 by the light receiving function device 137d, so that crosstalk with respect to light having the wavelength of λ3 guided to the optical waveguide 160 by the modulation function device 136 is suppressed. be able to.

  The unit 140D has one modulation function device 146 as a modulation function unit, and four light reception function devices 147a to 147d as light reception function units.

  Here, when light having wavelengths λ1, λ2, λ3, and λ4 is guided in the optical waveguide 150, the unit 140D uses light having a wavelength of λ4 when transmitting data to other units. The modulation function device 146 guides light having a wavelength of λ4 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. The modulation function device 146 is configured in the same manner as the modulation function device 112a (see FIG. 5) described above.

  The unit 140D uses light having a wavelength of λ1 when receiving data from the unit 110D, uses light having a wavelength of λ2 when receiving data from the unit 120D, and receives data from the unit 130D. Uses light having a wavelength of λ3. The light receiving function devices 147a, 147b, and 147c respectively extract light with wavelengths λ1, λ2, and λ3 from the optical waveguide 160 to obtain received data.

  These light receiving function devices 147a, 147b, and 147c are respectively configured in the same manner as the light receiving function device 113a (see FIG. 6) described above. However, these light receiving functional devices 147a, 147b, and 147c extract light of wavelengths λ1, λ2, and λ3 guided by the optical waveguide 160 by a certain ratio, for example, 30%, 50%, and 100%, respectively. Set to As a result, the light having the wavelength of λ1 from the unit 110D can be extracted by the downstream units 130D and 120D, and the light having the wavelength of λ2 from the unit 120D can be extracted by the downstream unit 130D. .

  The light receiving functional device 147d takes out light having a wavelength of λ4 from the optical waveguide 160 and removes it. The light receiving function device 147d is configured in the same manner as the light receiving function device 113a (see FIG. 6) described above, and is set so as to extract all the light having the wavelength of λ4 guided by the optical waveguide 160. The light guided to the optical waveguide 160 by the modulation function device 146 of the unit 140C goes around the optical waveguide 160 and returns to the connection portion of the unit 140D. As described above, light having a wavelength of λ4 is extracted from the optical waveguide 160 by the light receiving function device 147d, so that crosstalk with respect to the light having the wavelength of λ4 guided to the optical waveguide 160 by the modulation function device 146 is suppressed. be able to.

  The operation of the optical data transmission system 100D shown in FIG. 15 will be described. Here, a case where data is transmitted from the unit 110D to the units 120D, 130D, and 140D will be described as an example.

  First, an operation when data is transmitted from the unit 110D to the unit 120D will be described. In this case, the transmission data TD is supplied from the device 111 of the unit 110D to the modulation function device 116. Thereby, the light having the wavelength of λ1 is guided from the optical waveguide 150 to the optical waveguide 160 by the modulation function device 116 in a state modulated by the transmission data TD. In this case, in the light receiving function device 127c of the unit 120D, light having a wavelength of λ1 is extracted from the optical waveguide 160, and the reception data RD corresponding to the transmission data TD from the device 111 of the unit 110D described above is extracted from the light receiving element. The received data RD is supplied to the device 121.

  Next, an operation when data is transmitted from the unit 110D to the unit 130D will be described. In this case, the transmission data TD is supplied from the device 111 of the unit 110D to the modulation function device 116. Thereby, the light having the wavelength of λ1 is guided from the optical waveguide 150 to the optical waveguide 160 by the modulation function device 116 in a state modulated by the transmission data TD. In this case, in the light receiving function device 137b of the unit 130D, light having a wavelength of λ1 is extracted from the optical waveguide 160, and reception data RD corresponding to the transmission data TD from the device 111 of the unit 110D described above is extracted from the light receiving element. The received data RD is supplied to the device 131.

  Next, an operation when data is transmitted from the unit 110D to the unit 140D will be described. In this case, the transmission data TD is supplied from the device 111 of the unit 110D to the modulation function device 116. Thereby, the light having the wavelength of λ1 is guided from the optical waveguide 150 to the optical waveguide 160 by the modulation function device 116 in a state modulated by the transmission data TD. In this case, in the light receiving function device 147a of the unit 140D, light having a wavelength of λ1 is extracted from the optical waveguide 160, and the reception data RD corresponding to the transmission data TD from the device 111 of the unit 110D described above is extracted from the light receiving element. The received data RD is supplied to the device 141.

  Although description is omitted, the operation when data is transmitted from the units 120D, 130D, and 140D to other units is the same as that when data is transmitted from the unit 110D to the other units.

  According to the optical data transmission system 100D shown in FIG. 15, each unit uses the light having the wavelengths λ1, λ2, λ3, and λ4 guided by the optical waveguide 150 to modulate the predetermined wavelength corresponding to the transmission data. The light is obtained, and each unit does not need to be provided with a light emitting element, and thus can be configured inexpensively and easily.

  The light extracted from the optical waveguide 160 by the light receiving function device of each unit is light having a wavelength corresponding to the other unit that performs communication, and the light having the wavelength is guided to the waveguide 160 by the other unit. Therefore, it is not necessary to add an address indicating the transmission source unit to the transmission data, the data area of the header portion of the transmission data can be reduced, and the substantial data transfer rate can be increased.

  In addition, communication is performed using light of a wavelength corresponding to the transmission source unit, and a plurality of data communication with different transmission sources can be performed in parallel, and the data transmission density can be extremely increased. For example, data transmission from the unit 110D to the unit 130D and data transmission from the unit 120D to the unit 140D can be performed in parallel.

  Each unit modulates light of a single wavelength and guides it to the optical waveguide 160, and receives light of each wavelength guided to the optical waveguide 160 by other units. Therefore, when it is desired to perform broadcast type data communication, one modulation function device can be operated, and power consumption can be reduced.

  Next, a sixth embodiment of the present invention will be described. FIG. 16 shows a configuration of an optical data transmission system 100E as the sixth embodiment. In FIG. 16, portions corresponding to those in FIG. 15 are denoted by the same reference numerals.

  The optical data transmission system 100E includes units 110E to 140E instead of the units 110D to 140D of the optical data transmission system 100D shown in FIG.

  The unit 110E includes light receiving function devices 119a, 119b, and 119c instead of the light receiving function devices 117a, 117b, and 117c of the unit 110D, and the other configuration is the same as that of the unit 110D.

  Here, when receiving data from the unit 120E, the unit 130E, or the unit 140E, the unit 110E uses light having a wavelength of λ2, λ3, or λ4, respectively. The light receiving functional devices 119a, 119b, and 119c respectively extract light having wavelengths λ2, λ3, and λ4 from the optical waveguide 160 to obtain received data.

  The light receiving function device 119a is configured to apply the above-described micro ring resonator. FIG. 17 shows a configuration example of the light receiving function device 119a. The light receiving functional device 119a includes a ring-shaped optical waveguide 71 disposed in the vicinity of the optical waveguide 160, an arc-shaped optical waveguide 72 disposed in the vicinity of the ring-shaped optical waveguide 71, and the optical waveguide. And a light receiving element (PD) 73 for receiving the light guided by 72.

  Here, the ring-shaped optical waveguide 71 guides light having a wavelength of λ2 from the optical waveguide 160 to the optical waveguide 72. Therefore, the ring-shaped optical waveguide 71 basically has a resonance wavelength set to a wavelength corresponding to the unit 120E, that is, λ2 in this embodiment.

  The ring-shaped optical waveguide 71 further includes a ratio adjusting mechanism (attenuator ATT) that adjusts the ratio of light having a wavelength of λ2 guided from the optical waveguide 160 to the optical waveguide 72 as described above. That is, a heater 74 driven by the control data CD from the device 111 is disposed corresponding to the ring-shaped optical waveguide 71. By changing the refractive index of the ring-shaped optical waveguide 71 by changing the refractive index of the ring-shaped optical waveguide 71 by the heat generation of the heater 74, the ratio of the light having the wavelength of λ2 to be guided is shifted. adjust.

  In this case, the ring-shaped optical waveguide 71 guides light having a wavelength of λ2 from the optical waveguide 160 to the optical waveguide 72 at a predetermined ratio. Then, the light having the wavelength of λ 2 guided to the optical waveguide 72 is supplied to the light receiving element 73, and the reception data RD is obtained from the light receiving element 73.

  Although detailed description is omitted, the light receiving function devices 119b and 119c have the same configuration as the light receiving function device 119a described above.

  The unit 120E includes light receiving function devices 129a, 129b, and 129c instead of the light receiving function devices 127a, 127b, and 127c of the unit 120D, and the other configuration is the same as that of the unit 120D. Here, when receiving data from the unit 130E, the unit 140E, or the unit 110E, the unit 120E uses light having a wavelength of λ3, λ4, or λ1, respectively. The light receiving function devices 129a, 129b, and 129c respectively extract light having wavelengths λ3, λ4, and λ1 from the optical waveguide 160 to obtain received data. These light receiving function devices 129a, 129b, and 129c are configured similarly to the light receiving function device 119a (see FIG. 17) described above.

  The unit 130E includes light receiving function devices 139a, 139b, and 139c instead of the light receiving function devices 137a, 137b, and 137c of the unit 130D, and the other configuration is the same as that of the unit 130D. Here, when receiving data from the unit 140E, the unit 110E, or the unit 120E, the unit 130E uses light having a wavelength of λ4, λ1, or λ2, respectively. The light receiving function devices 139a, 139b, and 139c respectively extract light having wavelengths λ4, λ1, and λ2 from the optical waveguide 160 to obtain received data. These light receiving function devices 139a, 139b, and 139c are configured similarly to the light receiving function device 119a (see FIG. 17) described above.

  The unit 140E includes light receiving function devices 149a, 149b, and 149c instead of the light receiving function devices 147a, 147b, and 147c of the unit 140D, and the other configuration is the same as that of the unit 140D. Here, when receiving data from the unit 110E, the unit 120E, or the unit 130E, the unit 140E uses light having a wavelength of λ1, λ2, or λ3, respectively. The light receiving function devices 149a, 149b, and 149c take out light of wavelengths λ1, λ2, and λ3 from the optical waveguide 160, respectively, and obtain received data. These light receiving function devices 149a, 149b, and 149c are configured in the same manner as the light receiving function device 119a (see FIG. 17) described above.

  The operation of the optical data transmission system 100E shown in FIG. 16 is the same as that of the optical data transmission system 100D shown in FIG.

  According to the optical data transmission system 100E shown in FIG. 16, the same effects as those of the optical data transmission system 100D shown in FIG. 15 can be obtained.

  In addition, according to the optical data transmission system 100E shown in FIG. 16, the light receiving function device that extracts the light guided to the optical waveguide 160 by the other units of each unit has the ratio adjustment mechanism. When point-to-point communication is performed, it can be set so that all light of the corresponding wavelength is extracted from the optical waveguide 160, and reception sensitivity can be increased. In this case, when broadcast communication is performed, the light receiving function device for obtaining the reception data in each unit is set so as to extract a part of the light of the corresponding wavelength from the optical waveguide 160.

  Next explained is the seventh embodiment of the invention. FIG. 18 shows a configuration of an optical data transmission system 100F as the seventh embodiment. In FIG. 18, portions corresponding to those in FIG. 2 are denoted by the same reference numerals.

  This optical data transmission system 100F has units 110F to 140F instead of the units 110A to 140A of the optical data transmission system 100A shown in FIG.

  The unit 110F has one modulation function device 112 ′ as a modulation function unit and one light reception function device 113 ′ as a light reception function unit.

  Here, light having a wavelength of λ0 is guided in the optical waveguide 150, and the unit 110F uses light having a wavelength of λ0 when transmitting data to other units. The modulation functional device 112 ′ guides light having a wavelength of λ0 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data.

  The modulation functional device 112 ′ is configured by applying the above-described microring resonator. FIG. 19 shows a configuration example of the modulation function device 112 ′. The modulation functional device 112 ′ has a configuration in which one ring-shaped optical waveguide 81 is arranged between the optical waveguides 150 and 160.

  The ring-shaped optical waveguide 81 constitutes a modulator (MOD), and a heater 82 driven by transmission data TD is disposed corresponding to the ring-shaped optical waveguide 81. The resonance wavelength of the ring-shaped optical waveguide 81 is basically set to λ0. For example, in the bit “1” or “0” of the transmission data TD, the heat of the heater 13 causes heat generation of the ring-shaped optical waveguide 81. The refractive index changes, and the resonance wavelength is shifted from λ0. Therefore, light having a wavelength of λ0 is guided from the optical waveguide 150 to the optical waveguide 160 in a state modulated by the transmission data TD by the ring-shaped optical waveguide 81.

  The unit 110F uses light having a wavelength of λ0 when receiving data from other units. The light receiving function device 113 ′ takes out light having a wavelength of λ0 from the optical waveguide 160 to obtain received data. The light receiving function device 113 ′ is configured in the same manner as the light receiving function device 113a (see FIG. 6) described above.

  The unit 120F has one modulation function device 122 ′ as a modulation function unit and one light reception function device 123 ′ as a light reception function unit. Here, light having a wavelength of λ0 is guided in the optical waveguide 150, and the unit 120F uses light having a wavelength of λ0 when transmitting data to other units. The modulation function device 122 ′ guides light having a wavelength of λ0 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. The modulation function device 122 ′ is configured in the same manner as the modulation function device 112 ′ (see FIG. 19) described above.

  The unit 120F uses light having a wavelength of λ0 when receiving data from other units. The light receiving function device 123 ′ extracts light having a wavelength of λ0 from the optical waveguide 160 to obtain received data. The light receiving function device 123 ′ is configured in the same manner as the light receiving function device 113a (see FIG. 6) described above.

  The unit 130F has one modulation function device 132 ′ as a modulation function unit and one light reception function device 133 ′ as a light reception function unit. Here, light having a wavelength of λ0 is guided in the optical waveguide 150, and the unit 130F uses light having a wavelength of λ0 when transmitting data to other units. The modulation functional device 132 ′ guides light having a wavelength of λ0 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. The modulation function device 132 ′ is configured in the same manner as the modulation function device 112 ′ (see FIG. 19) described above.

  The unit 130F uses light having a wavelength of λ0 when receiving data from other units. The light receiving function device 133 ′ extracts light having a wavelength of λ0 from the optical waveguide 160 to obtain received data. The light receiving function device 133 ′ is configured in the same manner as the light receiving function device 113a (see FIG. 6) described above.

  The unit 140F has one modulation function device 142 ′ as a modulation function unit and one light reception function device 143 ′ as a light reception function unit. Here, light having a wavelength of λ0 is guided in the optical waveguide 150, and the unit 140F uses light having a wavelength of λ0 when transmitting data to other units. The modulation functional device 142 ′ guides light having a wavelength of λ0 from the optical waveguide 150 to the optical waveguide 160 based on the transmission data. The modulation function device 142 ′ is configured in the same manner as the modulation function device 112 ′ (see FIG. 19) described above.

  The unit 140F uses light having a wavelength of λ0 when receiving data from other units. The light receiving function device 143 ′ extracts light having a wavelength of λ0 from the optical waveguide 160 to obtain received data. The light receiving function device 143 ′ is configured in the same manner as the light receiving function device 113a (see FIG. 6) described above.

  The operation of the optical data transmission system 100F shown in FIG. 18 will be described. Here, a case where data is transmitted from the unit 110F to the units 120F, 130F, and 140F will be described as an example.

  First, an operation when data is transmitted from the unit 110F to the unit 120F will be described. In this case, the transmission data TD is supplied from the device 111 of the unit 110F to the modulation function device 112 ′. Accordingly, light having a wavelength of λ0 is guided from the optical waveguide 150 to the optical waveguide 160 by the modulation function device 112 ′ in a state modulated by the transmission data TD. In this case, in the light receiving function device 123 ′ of the unit 120F, light having a wavelength of λ0 is extracted from the optical waveguide 160, and the received data RD corresponding to the transmission data TD from the device 111 of the unit 110F described above is extracted from the light receiving element. The received data RD is supplied to the device 121.

  Next, an operation when data is transmitted from the unit 110F to the unit 130F will be described. In this case, the transmission data TD is supplied from the device 111 of the unit 110F to the modulation function device 112 ′. Accordingly, light having a wavelength of λ0 is guided from the optical waveguide 150 to the optical waveguide 160 by the modulation function device 112 ′ in a state modulated by the transmission data TD. In this case, the light receiving function device 133 ′ of the unit 130F extracts light having a wavelength of λ0 from the optical waveguide 160, and the received data RD corresponding to the transmission data TD from the device 111 of the unit 110F described above is extracted from the light receiving element. And the received data RD is supplied to the device 131.

  Next, an operation when data is transmitted from the unit 110F to the unit 140F will be described. In this case, the transmission data TD is supplied from the device 111 of the unit 110F to the modulation function device 112 ′. As a result, light having a wavelength of λ0 is guided from the optical waveguide 150 to the optical waveguide 160 by the modulation function device 112 ′ in a state modulated by the transmission data TD. In this case, in the light receiving function device 143 ′ of the unit 140F, light having a wavelength of λ0 is extracted from the optical waveguide 160, and the received data RD corresponding to the transmission data TD from the device 111 of the unit 110F described above is extracted from the light receiving element. The received data RD is supplied to the device 141.

  Although description is omitted, the operation when data is transmitted from the units 120F, 130F, and 140F to other units is the same as that when data is transmitted from the unit 110F to the other units.

  According to the optical data transmission system 100F shown in FIG. 18, each unit uses the light having the wavelength of λ0 guided by the optical waveguide 150 to obtain the modulated light having the wavelength of λ0 corresponding to the transmission data. Each unit does not need to have a light emitting element, and thus can be configured inexpensively and easily.

  In the above-described embodiment, the optical waveguide 150 is shown as a ring-shaped optical waveguide. However, as shown in FIG. 20, the optical waveguide 150 does not have to be in a ring shape.

  In the above-described embodiment, the modulation function device and the light reception function device using the principle of the microring resonator are shown. However, the present invention is not limited to this configuration, and is configured using a wavelength selective mirror or the like. You can also However, the configuration using the principle of the microring resonator can reduce the size of the modulation function device and the light receiving function device.

  The present invention can be configured inexpensively and easily without each unit having a light emitting element, and can be applied to data transmission between semiconductor chips such as LSIs.

It is a figure which shows the structure of the optical data transmission system as 1st Embodiment. It is a figure which shows the structure of the optical data transmission system as 1st Embodiment. It is a figure for demonstrating the basic principle of a micro ring resonator. It is a figure for demonstrating the basic principle of a micro ring resonator. It is a figure which shows the structural example of a modulation function device. It is a figure which shows the structural example of a light reception functional device. It is a figure which shows the manufacturing process of a ridge type | mold optical waveguide. It is a figure which shows the manufacturing process of a SIMOX optical waveguide. It is a figure which shows the structure of the optical data transmission system as 2nd Embodiment. It is a figure which shows the structural example of a modulation function device. It is a figure which shows the structure of the optical data transmission system as 3rd Embodiment. It is a figure which shows the structural example of a light reception functional device. It is a figure which shows the structure of the optical data transmission system as 4th Embodiment. It is a figure which shows the structural example of a light reception functional device. It is a figure which shows the structure of the optical data transmission system as 5th Embodiment. It is a figure which shows the structure of the optical data transmission system as 6th Embodiment. It is a figure which shows the structural example of a light reception functional device. It is a figure which shows the structure of the optical data transmission system as 7th Embodiment. It is a figure which shows the structural example of a modulation function device. It is a figure which shows the modification of an optical data transmission system.

Explanation of symbols

100, 100A to 100F, optical data transmission system, 110 to 140, 110A to 140A, 110B to 140B, 110C to 140C, 110E to 140E, 110F to 140F, unit, 111, 121, 131, 141,. I / O devices, 112, 122, 132, 142... Modulation function units, 112a to 112c, 122a to 122c, 132a to 132c, 142a to 142c, 114, 124, 134, 144, 116, 126, 136, 146, 112 ', 122', 132 ', 142' ... modulation function device, 113, 123, 133, 143 ... light receiving function unit, 113a, 123a, 133a, 143a, 115, 125, 135, 145 117a to 117d, 127a to 127d, 137a to 137 , 147a to 147d, 118, 128, 138, 148, 119a to 119c, 129a to 129c, 139a to 139c, 149a to 149c, 113 ', 123', 133 ', 143' ... light receiving function device, 150, 160 ... Optical waveguide, 170 ... Light emitting part

Claims (9)

Multiple units that send and receive data;
A first optical waveguide connecting the plurality of units and guiding light of a single wavelength or a plurality of wavelengths having no data information;
A ring-shaped second optical waveguide for guiding light of single or multiple wavelengths having data information, connecting the plurality of units;
Each of the plurality of units has at least one modulation function device and at least one light reception function device,
One or more modulation function device having the plurality of units each respectively, light of a predetermined wavelength modulated based on the value of the transmission data, to the first optical waveguide or found on Symbol second optical waveguide Guided,
At least one of the one or more light receiving function device having the plurality of units each, the second optical waveguide, Rutotomoni obtain the received data is taken out light of a predetermined wavelength from the second optical waveguide An optical data transmission system having an adjustment mechanism for adjusting a ratio of extracted light . Light said modulation function device is guided to the second optical waveguide from the first optical waveguide, Ru optical der having a wavelength corresponding to the other units of the communication
Optical data transmission system according to 請 Motomeko 1. Light the light receiving function device removed from the second optical waveguide, Ru optical der having a wavelength corresponding to the other units of the communication
Optical data transmission system according to 請 Motomeko 1. Each of the plurality of units has, as the light receiving functional device, a light receiving functional device that takes out the light guided to the second optical waveguide by the modulation functional device from the second optical waveguide and removes it. Ru
Optical data transmission system according to 請 Motomeko 1. The modulation function devices that have a control mechanism for adjusting the wavelength of light guided to the second optical waveguide from the first optical waveguide
Optical data transmission system according to 請 Motomeko 1. Receiving functional device for obtaining the received data, that have a regulating mechanism for adjusting the wavelength of the light extracted from the second optical waveguide
Optical data transmission system according to 請 Motomeko 1. The plurality of units, said first optical waveguide and said second optical waveguide, Ru is formed on the same substrate
Optical data transmission system according to 請 Motomeko 1. Said first optical waveguide and said second optical waveguide, Ru buried optical waveguide der formed by SIMOX method
Optical data transmission system according to 請 Motomeko 1. A first optical waveguide for guiding light of a single or a plurality of wavelengths not having data information and a ring-shaped second optical waveguide for guiding a single or a plurality of lights having data information are prepared , When transmitting data from the first unit to the second unit,
The first unit, light of a predetermined wavelength which is modulated based on the value of the transmission data, and guided to the first optical waveguide or found on Symbol second optical waveguide,
The second unit takes out light of a predetermined wavelength guided from the first optical waveguide by the first unit from the second optical waveguide based on the adjusted ratio, and receives data. Ru obtain a
Optical data transmission method.

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