JP6572980B2 - Optical transmitter, optical receiver, optical communication device, optical communication system, and control methods thereof - Google Patents

Description

  The present invention relates to an optical transmission device, an optical reception device, an optical communication device, an optical communication system, and control methods thereof.

  Along with the explosive demand for broadband multimedia communication services such as the Internet and video distribution, the introduction of high-distance wavelength-division-multiplexed optical fiber communication systems with longer distances, larger capacities, and higher reliability is increasing in trunk and metro systems. In addition, optical fiber access services are rapidly spreading in subscriber systems. In a communication system using such an optical fiber, it is important to reduce the installation cost of an optical fiber that is an optical transmission line and to increase the transmission band utilization efficiency per optical fiber. For this reason, wavelength division multiplexing (WDM) that multiplexes and transmits a plurality of optical signals having different wavelengths is widely used. In the WDM technology, one wavelength is used for one channel. On the other hand, recently, super channel technology capable of realizing a transmission capacity exceeding 100 Gbps per band of the WDM 1 channel has attracted attention. In this super channel technology, since a plurality of wavelengths (subcarriers) are used for one channel band, the wavelengths can be multiplexed with high density. Therefore, in the future, this super-channel technology will become important when the transmission capacity is further increased to 400 Gbps and 1 Tbps.

  Patent Documents 1 and 2 disclose techniques related to optical communication using WDM. Patent Document 1 discloses a technique related to an optical network device that can perform efficient network operation, management, and maintenance. Patent Document 2 discloses a technique related to an optical transmission device that can reduce the influence of mutual mixing noise when an electrical signal including a plurality of subcarriers is transmitted by analog optical modulation.

JP 2003-008513 A JP 2008-206063 A

  In a communication network, traffic between predetermined nodes is moderate. For this reason, transmission between predetermined nodes need not always be performed with the maximum transmission capacity. On the other hand, as described in the background art, in the optical communication using the WDM technology, one wavelength is used for one channel. For this reason, in the optical communication apparatus using the WDM technology, there is only an option of turning off the communication or performing the communication with the maximum transmission capacity, and the transmission capacity cannot be set to an intermediate value. .

  On the other hand, when the super channel technology is used, since a plurality of wavelengths are used in the band of one channel of WDM, the transmission capacity can be set to an intermediate value. In light of this point, the inventor uses the remaining wavelengths for other transmission wavelengths when the transmission capacity is set to an intermediate value using a part of a plurality of wavelengths in one channel band for the transmission apparatus. It was discovered that resources can be allocated to transmission equipment.

  In view of the above, an object of the present invention is to provide an optical transmission device, an optical reception device, an optical communication device, an optical communication system, and a control method thereof that can implement efficient resource allocation in an optical communication network.

  An optical transmission apparatus according to the present invention includes a first transmission unit that transmits a first optical transmission signal, a second transmission unit that transmits a second optical transmission signal, the first optical transmission signal, and the When the second optical transmission signal shares a series of information, both the first optical transmission signal and the second optical transmission signal are output to the first path, and the first optical transmission signal and the An output unit that outputs either the first optical transmission signal or the second optical transmission signal to the second path when the second optical transmission signal does not share the series of information.

  An optical receiver according to the present invention includes first and second receiving units that receive a subcarrier received signal, and the input first and second subcarrier received signals to the first and second subcarrier received signals. A switching unit that outputs to the second receiving unit, and the switching unit, when the first and second subcarrier received signals share a series of information, the first and second subcarrier received signals The first subcarrier received signal to the first receiving unit and the second subcarrier received signal to the second receiving unit, respectively, and the first subcarrier received signal to the second receiving unit, When the first subcarrier received signal and the second subcarrier received signal do not share the series of information, the first and second subcarrier received signals are received via different paths, respectively. 1's Outputs subcarrier reception signal to the first receiving unit, and outputs the second sub-carrier received signal to the second receiver.

  An optical communication apparatus according to the present invention includes a first transmission unit that transmits a first optical transmission signal, a second transmission unit that transmits a second optical transmission signal, the first optical transmission signal, and the When the second optical transmission signal shares a series of information, both the first optical transmission signal and the second optical transmission signal are output to the first path, and the first optical transmission signal and the An output unit that outputs one of the first optical transmission signal and the second optical transmission signal to a second path when the second optical transmission signal does not share the series of information; and subcarrier reception A first and a second receiving unit for receiving a signal, and a switching unit for outputting the input first and second subcarrier received signals to the first and second receiving units. And the switching unit includes the first subcarrier received signal and the second subcarrier. When the received signal shares a series of information, the first subcarrier received signal is output to the first receiving unit, and the second subcarrier received signal is output to the second receiving unit, respectively. When the subcarrier reception signal and the second subcarrier reception signal do not share the series of information, the first subcarrier reception signal is output to the second reception unit.

  An optical communication system according to the present invention is an optical communication system including an optical transmission device and first and second optical reception devices, wherein the optical transmission device transmits a first optical transmission signal. When the first transmission unit, the second transmission unit that transmits the second optical transmission signal, and the first optical transmission signal and the second optical transmission signal share a series of information, the first transmission unit When both the optical transmission signal and the second optical transmission signal are output to the first optical receiving device, and the first optical transmission signal and the second optical transmission signal do not share the series of information, An output unit that outputs one of the first optical transmission signal and the second optical transmission signal to the second optical receiver.

  An optical communication system according to the present invention includes an optical transmission device that transmits first and second optical transmission signals, first and second optical reception devices that receive the first and second optical transmission signals, A controller for controlling the optical transmission device, and the optical transmission device shares a series of information with the first optical transmission signal and the first optical transmission signal in response to an instruction from the controller. A second optical transmission signal is output to the first optical reception device, and a second optical transmission signal that does not share a series of information with the first optical transmission signal is output to the second optical reception device.

  An optical communication system according to the present invention is an optical communication system including first and second optical transmission devices and an optical reception device, wherein the optical reception device receives first and second subcarrier reception signals. A second receiving unit; and a switching unit that outputs the input first subcarrier received signal and the second subcarrier received signal to the first and second receiving units. When the first and second subcarrier reception signals share a series of information, the first and second subcarrier reception signals are received from the same optical transmission device, and the first subcarrier reception signal is received. The second subcarrier received signal is output to the first receiving unit to the second receiving unit, respectively, and the first subcarrier received signal and the second subcarrier received signal are the series of information. If you do not share The first and second subcarrier received signals are received from different optical transmitters, the first subcarrier received signal is output to the first receiver, and the second subcarrier received signal is Output to the second receiver.

  A controller according to the present invention is an optical communication system including an optical transmission device and first and second optical reception devices. The first optical transmission signal and the first optical transmission are transmitted to the optical transmission device. A second optical transmission signal sharing a series of information with a signal is output to the first optical receiver, and a second optical transmission signal not sharing a series of information with the first optical transmission signal is output to the second optical transmission signal. Output to the optical receiver.

  An optical communication system control method according to the present invention is an optical communication system control method including an optical transmission device and first and second optical reception devices, wherein the optical transmission device is a first optical device. A first transmission unit that transmits a transmission signal, a second transmission unit that transmits a second optical transmission signal, and the first optical transmission signal and the second optical transmission signal share a series of information. The first optical transmission signal and the second optical transmission signal are output to the first optical reception device, and the first optical transmission signal and the second optical transmission signal are output in the series. An output unit that outputs one of the first optical transmission signal and the second optical transmission signal to the second optical reception device when information is not shared, and a communication state of the optical communication system And controlling the optical transmitter and the first and second optical receivers respectively. That.

  A program according to the present invention is a program for controlling an optical communication system including an optical transmission device and first and second optical reception devices, wherein the optical transmission device transmits a first optical transmission signal. The first transmission unit, the second transmission unit that transmits the second optical transmission signal, and the first optical transmission signal and the second optical transmission signal share a series of information, Both the first optical transmission signal and the second optical transmission signal are output to the first optical receiver, and the first optical transmission signal and the second optical transmission signal do not share the series of information. An output unit that outputs one of the first optical transmission signal and the second optical transmission signal to the second optical reception device, and depending on a communication state of the optical communication system, Control the optical transmitter and the first and second optical receivers, respectively. Is a program for executing the management to the computer.

  An optical transmission method according to the present invention generates a first optical transmission signal, generates a second optical transmission signal, and the first optical transmission signal and the second optical transmission signal share a series of information. The first optical transmission signal and the second optical transmission signal are output to a first path, and the first optical transmission signal and the second optical transmission signal output the series of information. When not sharing, one of the first optical transmission signal and the second optical transmission signal is output to the second path.

  In the optical reception method according to the present invention, when the first and second subcarrier received signals share a series of information, the first and second subcarrier received signals are received via the same path. The first subcarrier received signal is output to the first receiving unit, and the second subcarrier received signal is output to the second receiving unit, respectively, and the first subcarrier received signal and the second subcarrier are output. When the received signal does not share the series of information, the first and second subcarrier received signals are received via different paths, and the first subcarrier received signal is received by the first receiving unit. And the second subcarrier reception signal is output to the second reception unit.

  According to the present invention, it is possible to provide an optical transmission device, an optical reception device, an optical communication device, an optical communication system, and a control method thereof that can implement efficient resource allocation in an optical communication network.

1 is a block diagram showing an optical transmission apparatus according to a first exemplary embodiment; It is a figure which shows the optical communication system concerning a comparative example. It is a figure which shows the optical communication system concerning a comparative example. It is a figure for demonstrating the effect of this invention. FIG. 3 is a block diagram of an optical transmission apparatus according to a second embodiment. It is a figure for demonstrating arrangement | positioning of a subcarrier. It is a figure for demonstrating arrangement | positioning of a subcarrier. FIG. 6 is a block diagram of an optical transmission apparatus according to a third embodiment. It is a figure which shows an example of a subcarrier (WDM). It is a figure which shows the other example of a subcarrier (OFDM modulation). FIG. 9 is a block diagram of an optical transmission apparatus according to a fourth embodiment. FIG. 9 is a block diagram of an optical transmission apparatus according to a fourth embodiment. FIG. 9 is a block diagram of an optical transmission apparatus according to a fourth embodiment. FIG. 10 is a block diagram of an optical receiving apparatus according to a fifth embodiment. FIG. 10 is a block diagram of an optical receiving apparatus according to a sixth embodiment. FIG. 10 is a block diagram of an optical receiver according to a seventh embodiment. FIG. 10 is a block diagram of an optical receiving apparatus according to an eighth embodiment. FIG. 10 is a block diagram of an optical receiving apparatus according to an eighth embodiment. FIG. 10 is a block diagram of an optical receiving apparatus according to an eighth embodiment. FIG. 10 is a block diagram of an optical communication apparatus according to a ninth embodiment. FIG. 10 is a block diagram of an optical communication system according to a tenth embodiment. FIG. 10 is a block diagram showing an optical communication system according to an eleventh embodiment. It is a block diagram which shows the controller with which the optical communication system concerning Embodiment 11 is provided. FIG. 20 is a block diagram illustrating a controller included in an optical communication system according to a twelfth embodiment. FIG. 20 is a block diagram showing an optical communication system according to a thirteenth embodiment. FIG. 18 is a block diagram showing an optical communication system according to a fourteenth embodiment. FIG. 18 is a block diagram showing an optical communication system according to a fifteenth embodiment;

<Embodiment 1>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an optical transmission device 1_1 according to the first embodiment. As illustrated in FIG. 1, the optical transmission device 1_1 according to the present embodiment includes a first transmission unit 11_1, a second transmission unit 11_2, and an output unit 12. Hereinafter, the first and second transmission units may be referred to as subcarrier transmission units.

  The first transmitter 11_1 transmits the first optical transmission signal 21_1. The second transmitter 11_2 transmits the second optical transmission signal 21_2. That is, transmission data is supplied to each of the first transmission unit 11_1 and the second transmission unit 11_2, and the first transmission unit 11_1 and the second transmission unit 11_2 transmit the first transmission data. An optical transmission signal 21_1 and a second optical transmission signal 21_2 are generated. The first optical transmission signal 21_1 and the second optical transmission signal 21_2 are signals for transmitting transmission data using subcarriers.

  The optical transmission device 1_1 according to the present embodiment uses a WDM technique that multiplexes and transmits a plurality of optical signals having different wavelengths. That is, the first optical transmission signal 21_1 and the second optical transmission signal 21_2 generated by the first transmission unit 11_1 and the second transmission unit 11_2 have different wavelengths. In particular, in the optical transmission apparatus according to the present embodiment, it is possible to use a super-channel technique that assigns a plurality of wavelengths (subcarriers) to one channel band of WDM. By using this super channel technology, the wavelengths can be multiplexed with high density, and the transmission capacity can be increased.

  When the first optical transmission signal 21_1 and the second optical transmission signal 21_2 share a series of information, the output unit 12 passes both the first optical transmission signal 21_1 and the second optical transmission signal 21_2 on the same path. (For example, the first path 26_1).

  On the other hand, when the first optical transmission signal 21_1 and the second optical transmission signal 21_2 do not share a series of information, the output unit 12 either one of the first optical transmission signal 21_1 or the second optical transmission signal 21_2. Is output to the second path. For example, when the first optical transmission signal 21_1 and the second optical transmission signal 21_2 do not share a series of information, the output unit 12 outputs the first optical transmission signal 21_1 to the first path 26_1, The optical transmission signal 21_2 may be output to the second path 26_2. Further, for example, when the first optical transmission signal 21_1 and the second optical transmission signal 21_2 do not share a series of information, the output unit 12 outputs the first optical transmission signal 21_1 to the second path 26_2. The second optical transmission signal 21_2 may be output to the first path 26_1. In other words, when the first optical transmission signal 21_1 and the second optical transmission signal 21_2 do not share a series of information, the output unit 12 outputs each of the first optical transmission signal 21_1 and the second optical transmission signal 21_2. Output to a different route.

  Here, when the first optical transmission signal 21_1 and the second optical transmission signal 21_2 share a series of information, for example, the first transmission unit 11_1 and the second transmission unit 11_2 perform the first optical transmission. This is a case where predetermined transmission data is transmitted in parallel using the signal 21_1 and the second optical transmission signal 21_2.

  On the other hand, when the first optical transmission signal 21_1 and the second optical transmission signal 21_2 do not share a series of information, for example, the first transmission unit 11_1 and the second transmission unit 11_2 are the first optical transmission signal. This is a case where predetermined transmission data is independently transmitted using 21_1 and the second optical transmission signal 21_2. That is, the first transmission unit 11_1 transmits predetermined first transmission data using the first optical transmission signal 21_1, and the second transmission unit 11_1 uses the second optical transmission signal 21_1 to perform predetermined first transmission data. This is a case of transmitting the second transmission data. In this case, since the first optical transmission signal 21_1 and the second optical transmission signal 21_2 include independent transmission data, the first optical transmission signal 21_1 and the second optical transmission signal 21_2 are respectively separated from each other. It is possible to output to the route (first route 26_1, second route 26_2).

  Here, the first path 26_1 is a path connected to a first optical receiver (not shown), and the second path 26_2 is a path connected to a second optical receiver (not shown). is there.

  As described above, in the optical transmission device 1_1 according to the present embodiment, the output destination of the first optical transmission signal 21_1 and the second optical transmission signal 21_2 is switched using the output unit 12. Therefore, it is possible to provide an optical transmission apparatus that can implement efficient resource allocation. The reason will be described in detail below.

  2 and 3 are diagrams showing an optical communication system according to a comparative example, and show an example of an optical communication system using a super channel technique. The optical communication system shown in FIGS. 2 and 3 includes optical communication apparatuses 101_a to 101_c. The optical communication device 101_a includes a plurality of transmission / reception units 102_a and a single transmission / reception port 103_a. The plurality of transmission / reception units 102_a are configured to be able to transmit and receive using different wavelengths (subcarriers). In other words, the optical communication apparatus 101_a can assign a plurality of wavelengths (subcarriers) to a band of one channel of WDM. Each transmitting / receiving unit 102_a is configured to be able to transmit / receive using each subcarrier. The same applies to the optical communication device 101_b and the optical communication device 101_c.

  2 and 3, the optical communication device 101_a and the optical communication device 101_b are configured to be connectable via the optical fiber 105, and the optical communication device 101_a and the optical communication device 101_c are optical fibers. The optical communication device 101_b and the optical communication device 101_c are configured to be connectable via the optical fiber 107.

  In the example shown in FIG. 2, the optical communication device 101_a and the optical communication device 101_b are connected via the optical fiber 105, and the optical communication device 101_a and the optical communication device 101_b communicate with each other with the maximum transmission capacity (100%). The case where it has gone is shown.

  In a communication network, traffic between predetermined nodes is moderate. For this reason, the transmission between the optical communication device 101_a and the optical communication device 101_b need not always be performed with the maximum transmission capacity. As described in the background art, in the optical communication using the WDM technology, one wavelength is used for one channel. For this reason, in the optical communication apparatus using the WDM technology, there is only an option of turning off the communication or performing the communication with the maximum transmission capacity, and the transmission capacity cannot be set to an intermediate value. .

  On the other hand, when the super channel technology is used, the transmission capacity can be set to an intermediate value because a plurality of wavelengths are used in the band of one channel of WDM. Therefore, for example, as shown in FIG. 3, the transmission capacity between the optical communication apparatus 101_a and the optical communication apparatus 101_b can be set to 50% of the maximum transmission capacity. However, in this case, an unused transmission / reception unit 108_a occurs among the transmission / reception units 102_a of the optical communication apparatus 101_a. Further, an unused transmission / reception unit 108_b is generated among the transmission / reception units 102_b of the optical communication apparatus 101_b.

  When the super channel technique is used, signals transmitted / received in the respective transmitting / receiving units 102_a share a series of information. In other words, each transmitting / receiving unit 102_a transmits and receives data in parallel. For this reason, the optical communication device 101_a is configured to transmit and receive an optical signal via a single port 103_a. Therefore, even when the unused transmission / reception unit 108_a among the transmission / reception units 102_a of the optical communication device 101_a occurs, the unused transmission / reception unit 108_a cannot be used for communication with the other optical communication device 101_c. There was a problem that wasted.

  FIG. 4 is a diagram for explaining the effect of the present invention. In addition, although the effect of this invention is demonstrated using an optical communication apparatus (optical communication apparatus which can be transmitted / received) in FIG. 4, the effect of this invention can be acquired similarly in an optical transmitter and an optical receiver. .

  The optical communication system illustrated in FIG. 4 includes optical communication devices 110_a to 110_c. The optical communication device 110_a includes a plurality of transmission / reception units 111_a, a switching unit 112_a, and a plurality of transmission / reception ports 113_1a and 113_2a. The plurality of transmission / reception units 111_a are configured to be able to transmit / receive using different subcarriers. That is, the optical communication device 110_a can allocate a plurality of wavelengths (subcarriers) in a WDM 1-channel band. The same applies to the optical communication device 110_b and the optical communication device 110_c.

  As described above, the optical communication device 110_a includes the plurality of transmission / reception ports 113_1a and 113_2a, and the transmission / reception unit 111_a connected to the plurality of transmission / reception ports 113_1a and 113_2a can be switched using the switching unit 112_a. Therefore, even when an unused transmission / reception unit is generated among the plurality of transmission / reception units 111_a of the optical communication device 110_a, the unused transmission / reception unit can be allocated to communication with other optical communication devices.

  For example, in the optical communication system shown in FIG. 3, when the transmission capacity between the optical communication apparatus 101_a and the optical communication apparatus 101_b is set to 50% of the maximum transmission capacity, the transmission / reception unit 102_a of the optical communication apparatus 101_a Of these, unused transmission / reception units 108_a are generated, and resources are wasted. On the other hand, in the optical communication system shown in FIG. 4, an unused transmission / reception unit (corresponding to the transmission / reception unit 108_a in FIG. 3) of the optical communication device 111_a is connected to the transmission / reception port 113_2a using the switching unit 112_a. Unused transmission / reception units can be allocated to communication with the optical communication device 110_c. Therefore, efficient resource allocation can be implemented in the optical communication network.

  At this time, the optical communication device 110_a and the optical communication device 110_b communicate with each other via the transmission / reception port 113_1a of the optical communication device 110_a and the transmission / reception port 113_1b of the optical communication device 110_b. The optical communication device 110_a and the optical communication device 110_c communicate via the transmission / reception port 113_2a of the optical communication device 110_a and the transmission / reception port 113_1c of the optical communication device 110_c. The optical communication device 110_b and the optical communication device 110_c communicate via the transmission / reception port 113_2b of the optical communication device 110_b and the transmission / reception port 113_2c of the optical communication device 110_c.

  4 shows an example in which the transmission capacity between the optical communication apparatuses 110_a to 110_c is 50% of the maximum transmission capacity. However, the transmission capacity between the optical communication apparatuses 110_a to 110_c is By using the switching units 112_a to 112_c, the number of transmission / reception units connected to the transmission / reception ports can be changed to set flexibly.

  With the invention according to the present embodiment described above, it is possible to provide an optical transmission apparatus and an optical transmission method capable of performing efficient resource allocation in an optical communication network.

<Embodiment 2>
Next, a second embodiment of the present invention will be described. In the second embodiment, a detailed configuration of the optical transmission device 1_1 described in the first embodiment will be described. FIG. 5 is a block diagram of an optical transmission device 1_2 according to the second embodiment. As illustrated in FIG. 5, the optical transmission device 1_2 according to the present embodiment includes a plurality of subcarrier transmission units 11_1 to 11_m, an output unit 12, and transmission ports 13_1 and 13_2.

  Transmission data is supplied to each of the plurality of subcarrier transmission units 11_1 to 11_m. The plurality of subcarrier transmission units (SCS_1 to SCS_m) 11_1 to 11_m generate optical transmission signals 21_1 to 21_m for transmitting transmission data, respectively. Here, m is an integer equal to or greater than 2, and corresponds to the number of subcarrier transmission units. The optical transmission signals 21_1 to 21_m are signals for transmitting transmission data using subcarriers. For example, the subcarrier transmission unit 11_1 generates the optical transmission signal 21_1 using the subcarrier SC1 corresponding to the subcarrier transmission unit 11_1. Also, the subcarrier transmission unit 11_2 generates the optical transmission signal 21_2 using the subcarrier SC2 corresponding to the subcarrier transmission unit 11_2. As described above, each of the subcarrier transmission units 11_1 to 11_m generates each of the optical transmission signals 21_1 to 21_m using each of the subcarriers SC1 to SCm corresponding to each of the subcarrier transmission units 11_1 to 11_m.

  Here, the respective optical transmission signals 21_1 to 21_m (in other words, the respective subcarriers SC1 to SCm used when generating the optical transmission signals 21_1 to 21_m) can be set using predetermined parameters. At this time, the parameters of the optical transmission signals 21_1 to 21_m are assigned so as not to overlap each other. When a plurality of parameters are used as the predetermined parameters, the optical transmission signals 21_1 to 21_m are arranged so as not to overlap each other on a matrix having the plurality of parameters as axes. For example, the predetermined parameter is at least one of wavelength, polarization, and time.

  6 and 7 are diagrams for explaining the arrangement of subcarriers. FIG. 6 shows an example of subcarrier arrangement when wavelength and time are used as predetermined parameters. In the case shown in FIG. 6, each subcarrier SC1 to SC4 is arranged when each subcarrier SC1 to SC4 is arranged on a matrix (in this case, on the XY plane) where the wavelength is the X axis and the time is the Y axis. SC4 is arranged so as not to overlap each other on the matrix plane. In the example shown in FIG. 6, the wavelengths of the subcarriers SC1 to SC4 are set to λ1 to λ4, respectively, and the subcarriers SC1 to SC4 are further time-divided at times t1 to t4. That is, subcarrier SC1 is set using parameters (λ1, t1), subcarrier SC2 is set using parameters (λ2, t2), subcarrier SC3 is set using parameters (λ3, t3), and subcarrier SC4 is set using parameters (λ4, t4). be able to.

  Further, FIG. 7 shows an example of subcarrier arrangement when wavelength and polarization are used as the predetermined parameters. In the case shown in FIG. 7, when each subcarrier SC1 to SC4 is arranged on a matrix (in this case, on the XY plane) where the wavelength is the X axis and the polarization is the Y axis, each subcarrier SC1 is arranged. ˜SC4 are arranged so as not to overlap each other on the matrix plane. In the example shown in FIG. 7, the wavelengths of the subcarriers SC1 to SC4 are set to λ1 to λ4, respectively, and the polarizations of the subcarriers SC1 to SC4 are set to X polarization and Y polarization. That is, the subcarrier SC1 is a parameter (λ1, X polarization), the subcarrier SC2 is a parameter (λ2, Y polarization), the subcarrier SC3 is a parameter (λ3, X polarization), and the subcarrier SC4 is a parameter (λ4, Y polarization). (Polarization).

  Thus, by assigning the parameters of the optical transmission signals 21_1 to 21_m so as not to overlap each other, it is possible to reduce the influence of mutual interference between subcarriers. 6 and 7, the case where each subcarrier is set using two parameters has been described. However, in this embodiment, each subcarrier may be set using three or more parameters. .

  When the wavelength is included as the parameter, the plurality of subcarrier transmission units 11_1 to 11_m each have a light source (a light source that outputs light of a single wavelength, not shown) for generating each of the subcarriers SC1 to SCm. You may have. For example, the light source can be configured using a laser diode.

  Further, the subcarrier transmission units 11_1 to 11_m may modulate the optical transmission signals 21_1 to 21_m using a predetermined modulation scheme. Examples of the modulation method include amplitude shift keying (ASK), frequency shift keying modulation (FSK), phase shift keying modulation (PSK), quadrature amplitude modulation (QAM), and quadrature phase shift keying (QPSK). . As quadrature amplitude modulation (QAM), for example, 16QAM, 64QAM, 128QAM, 256QAM, or the like can be used.

  The output unit 12 selectively outputs each of the optical transmission signals 21_1 to 21_m output from the plurality of subcarrier transmission units 11_1 to 11_m to the plurality of transmission ports (PS_1, PS_2) 13_1 and 13_2. Here, the transmission ports 13_1 and 13_2 correspond to the first route 26_1 and the second route 26_2 described in the first embodiment, respectively. At this time, the output unit 12 outputs an optical transmission signal 22_1 in which a plurality of optical transmission signals are multiplexed to the transmission port 13_1. For example, when the output unit 12 outputs the optical transmission signals 21_1 to 21_5 to the transmission port 13_1, the optical transmission signal 22_1 obtained by multiplexing the optical transmission signals 21_1 to 21_5 is supplied to the transmission port 13_1. Similarly, the output unit 12 outputs an optical transmission signal 22_2 obtained by multiplexing a plurality of optical transmission signals to the transmission port 13_2. For example, when the output unit 12 outputs the optical transmission signals 21_6 to 21_10 to the transmission port 13_2, the optical transmission signal 22_2 obtained by multiplexing the optical transmission signals 21_6 to 21_10 is supplied to the transmission port 13_2.

  The output unit 12 can arbitrarily and dynamically switch the optical transmission signals 21_1 to 21_m supplied to the transmission ports 13_1 and 13_2. For example, the output unit 12 is controlled using control means (not shown).

The plurality of transmission ports 13_1 and 13_2 are configured to be able to transmit the optical transmission signals 22_1 and 22_2 output from the output unit 12 (in other words, the optical transmission signals 21_1 to 21_m output from the subcarrier transmission units 11_1 to 11_m). ing. That is, the transmission port 13_1 outputs the optical transmission signal 23_1 (same as the optical transmission signal 22_1) to the first optical receiver (not shown) that is the connection destination. The transmission port 13_2 outputs an optical transmission signal 23_2 (same as the optical transmission signal 22_2) to a second optical receiving apparatus (not shown) that is a connection destination.

  In the present embodiment, the case where the optical transmission device 1_2 includes two transmission ports 13_1 and 13_2 has been described as an example. However, the number of transmission ports included in the optical transmission device 1_2 may be three or more. When the number of transmission ports is three or more, the output unit 12 selectively outputs each of the optical transmission signals 21_1 to 21_m output from the plurality of subcarrier transmission units 11_1 to 11_m to the three or more transmission ports. can do.

  As described above, in the optical transmission apparatus according to the present embodiment, a plurality of transmission ports 13_1 and 13_2 and an output unit 12 are provided, and a plurality of subcarrier transmission units 11_1 are used by using the output unit 12. The optical transmission signals 21_1 to 21_m output from ˜11_m are selectively output to the respective transmission ports 13_1 and 13_2. Therefore, for example, when an unused subcarrier transmission unit 11_m is generated when data is transmitted to the first optical receiver (not shown) via the transmission port 13_1, unused subcarrier transmission is performed. Data can be transmitted to the second optical receiver (not shown) via the transmission port 13_2 using the unit 11_m.

  Further, by dynamically switching the optical transmission signals 21_1 to 21_m supplied to the transmission ports 13_1 and 13_2 using the output unit 12, the transmission capacity in communication via the transmission port 13_1 and the transmission port 13_2 are changed. It is possible to dynamically adjust the transmission capacity in communication via the network.

  With the invention according to the present embodiment described above, it is possible to provide an optical transmission apparatus and an optical transmission method capable of performing efficient resource allocation in an optical communication network.

<Embodiment 3>
Next, a third embodiment of the present invention will be described. FIG. 8 is a block diagram showing an optical transmission device 1_3 according to the present embodiment. The optical transmission device 1_3 according to the present embodiment is different from the optical transmission device 1_2 described in the second embodiment in that it includes a light source 14, a subcarrier generation unit 15, and a signal conversion unit 16. Other than this, since it is the same as that of the optical transmission device 1_2 described in the second embodiment, the same components are denoted by the same reference numerals, and redundant description is omitted.

  As illustrated in FIG. 8, the optical transmission device 1_3 according to the present embodiment includes a plurality of subcarrier transmission units 11′_1 to 11′_m, an output unit 12, transmission ports 13_1 and 13_2, a light source 14, and a subcarrier generation unit 15. And a signal converter 16.

  The light source 14 is a light source that outputs a single carrier C1 (light having a single wavelength), and can be configured using, for example, a laser diode. The carrier C1 generated by the light source 14 is output to the subcarrier generation unit 15.

  The subcarrier generation unit 15 generates a plurality of subcarriers SC1 to SCm using the carrier C1 generated by the light source 14, and generates each of the generated subcarriers SC1 to SCm to each of the subcarrier transmission units 11′_1 to 11′_1. 11'_m. At this time, the subcarrier generation unit 15 may generate a plurality of subcarriers SC1 to SCm by modulating the carrier C1 generated by the light source 14 using a predetermined modulation method.

  For example, the subcarrier generation unit 15 may generate a plurality of subcarriers SC1 to SCm that are orthogonal to each other by modulating the carrier C1 generated by the light source 14 using an orthogonal frequency division multiplexing (OFDM). Good. Further, the subcarrier generation unit 15 may generate a plurality of subcarriers SC1 to SCm using the Nyquist WDM method. In this way, by generating a plurality of subcarriers SC1 to SCm using the OFDM method or the Nyquist WDM method, the frequency interval can be narrowed to the symbol rate interval, and in the communication using the super channel technology, the frequency utilization efficiency Can be increased.

  For example, when subcarriers are generated using the respective light sources provided in the respective subcarrier transmission units 11_1 to 11_m (see Embodiment 2), as shown in FIG. 9, the intervals between the subcarriers SC1 to SC4 Becomes wider. On the other hand, when the subcarriers are generated by modulating the carrier C1 generated by the light source 14 by the OFDM method as in the present embodiment, the intervals between the subcarriers SC1 to SC4 as shown in FIG. Becomes narrower than the case shown in FIG. 9, and the frequency utilization efficiency can be increased.

  At this time, the interval between the subcarriers SC1 to SCm is preferably constant. That is, when the wavelength interval of each of the subcarriers SC1 to SCm varies, it is necessary to consider the variation of the wavelength of each of the subcarriers SC1 to SCm, and the frequency utilization efficiency decreases. Therefore, in the optical transmission device 1_3 according to the present embodiment, a single light source is used as the light source 14. Thereby, the interval between the subcarriers SC1 to SCm can be made constant.

  The signal conversion unit 16 performs serial / parallel conversion on the input transmission data DS1 and DS2, and outputs the data DP1 to DPm subjected to serial / parallel conversion to the subcarrier transmission units 11'_1 to 11'_m, respectively. The subcarrier transmission unit 11'_1 generates an optical transmission signal 21_1 for transmitting data DP1 using the subcarrier SC1. The subcarrier transmission unit 11'_2 generates an optical transmission signal 21_2 for transmitting the data DP2 using the subcarrier SC2. As described above, the subcarrier transmission unit 11'_m generates the optical transmission signal 21_m for transmitting the data DPm using the subcarrier SCm.

  Therefore, in the optical transmission device 1_3 according to the present embodiment, the plurality of subcarrier transmission units 11′_1 to 11′_m correspond to the subcarriers SC1 to SC1 corresponding to the respective subcarrier transmission units 11′_1 to 11′_m. Transmission data DP1 to DPm can be transmitted in parallel using SCm.

  That is, each of the subcarrier transmitters 11′_1 to 11′_m that transmits the optical transmission signal 22_1 through the transmission port 13_1 can transmit the first data in parallel. . Moreover, each subcarrier transmission part which transmits optical transmission signal 22_2 via transmission port 13_2 among several subcarrier transmission parts 11'_1-11'_m can transmit 2nd data in parallel. .

  Specifically, for example, the optical transmission device 1_3 includes subcarrier transmission units 11′_1 to 11′_10, and among these subcarrier transmission units 11′_1 to 11′_10, the subcarrier transmission unit 11 ′. Assume that _1 to 11′_6 transmits the first data DS1 via the transmission port 13_1. In addition, it is assumed that the subcarrier transmission units 11'_7 to 11'_10 transmit the second data DS2 via the transmission port 13_2.

  In this case, the signal conversion unit 16 performs serial-parallel conversion on the input first data DS1, and outputs the first data DP1 to DP6 subjected to serial-parallel conversion to the subcarrier transmission units 11′_1 to 11′_6, respectively. To do. The subcarrier transmission units 11'_1 to 11'_6 generate optical transmission signals 21_1 to 21_6 for transmitting the first data DP1 to DP6 using the subcarriers SC1 to SC6, respectively. The output unit 12 outputs the generated optical transmission signals 21_1 to 21_6 to the transmission port 13_1. Thereby, the multiplexed optical transmission signal 22_1 is output from the transmission port 13_1. Therefore, each of the subcarrier transmission units 11'_1 to 11'_6 can transmit the first data DS1 subjected to serial-parallel conversion in parallel via the transmission port 13_1. At this time, the data width of the transmission data transmitted through the transmission port 13_1 corresponds to the number of subcarrier transmission units 11′_1 to 11′_6 connected to the transmission port 13_1 (that is, data DP1 to DP6). ing.

  Further, the signal conversion unit 16 performs serial-parallel conversion on the input second data DS2, and outputs the second data DP7 to DP10 subjected to serial-parallel conversion to the subcarrier transmission units 11′_7 to 11′_10, respectively. . The subcarrier transmission units 11'_7 to 11'_10 generate optical transmission signals 21_7 to 21_10 for transmitting the second data DP7 to DP10 using the subcarriers SC7 to SC10, respectively. The output unit 12 outputs the generated optical transmission signals 21_7 to 21_10 to the transmission port 13_2. Thereby, the multiplexed optical transmission signal 22_2 is output from the transmission port 13_2. Therefore, each of the subcarrier transmission units 11'_7 to 11'_10 can transmit the second data DS2 subjected to serial-parallel conversion in parallel via the transmission port 13_2. At this time, the data width of transmission data transmitted through the transmission port 13_2 corresponds to the number of subcarrier transmission units 11′_7 to 11′_10 connected to the transmission port 13_2 (that is, data DP7 to DP10). ing.

  The data width of the transmission data transmitted via the transmission port 13_1 and the data width of the transmission data transmitted via the transmission port 13_2 are respectively output from the plurality of subcarrier transmission units 11′_1 to 11′_m. The output destinations of the optical transmission signals 21_1 to 21_m can be adjusted by using the output unit 12.

  Also in the invention according to the present embodiment, it is possible to provide an optical transmission device and an optical transmission method capable of performing efficient resource allocation in an optical communication network.

<Embodiment 4>
Next, a fourth embodiment of the present invention will be described. FIG. 11 is a block diagram showing an optical transmission device 1_4 according to the present embodiment. In the optical transmission device 1_4 according to the present embodiment, a specific configuration example of the output unit 12 included in the optical transmission devices 1_1 to 1_3 described in the first to third embodiments is illustrated. Other than this, the optical transmitters 1_1 to 1_3 described in the first to third embodiments are the same as those in the first to third embodiments. Therefore, the same components are denoted by the same reference numerals, and redundant description is omitted.

  As illustrated in FIG. 11, the output unit 12_1 included in the optical transmission device 1_4 according to the present embodiment includes a switching unit 30 and optical multiplexers 31_1 and 31_2. The switching unit 30 switches the output destination of the optical transmission signals 21_1 to 21_m output from the subcarrier transmission units 11_1 to 11_m to either the optical multiplexer 31_1 or the optical multiplexer 31_2. The switching unit 30 can be configured using, for example, an optical matrix switch with m inputs and m × 2 outputs. Here, m inputs of the switching unit 30 correspond to the numbers of the respective optical transmission signals 21_1 to 21_m. For example, the switching unit 30 is controlled using control means (not shown).

  The plurality of optical multiplexers 31_1 and 31_2 are provided so as to correspond to the respective transmission ports 13_1 and 13_2, and multiplex the respective optical transmission signals 21_1 to 21_m output from the switching unit 30. That is, the optical multiplexer 31_1 multiplexes and multiplexes the respective optical transmission signals output from the switching unit 30, and outputs the multiplexed optical transmission signal 22_1 to the transmission port 13_1. Similarly, the optical multiplexer 31_2 combines and multiplexes the optical transmission signals output from the switching unit 30, and outputs the multiplexed optical transmission signal 22_2 to the transmission port 13_2.

  As described above, in the optical transmission device 1_4 according to the present embodiment, the output unit 12_1 is configured by using the switching unit 30 and the optical multiplexers 31_1 and 31_2. Therefore, the optical transmission signals 21_1 to 21_m supplied to the transmission ports 13_1 and 13_2 can be dynamically switched.

  Note that the switching unit 30 may be configured using a plurality of optical switches SW_1 to SW_m, like the output unit 12_2 included in the optical transmission device 1_5 illustrated in FIG. In this case, the plurality of optical switches SW_1 to SW_m are provided so as to correspond to the respective subcarrier transmission units 11_1 to 11_m, and outputs of the optical transmission signals 21_1 to 21_m output from the respective subcarrier transmission units 11_1 to 11_m. The destination is switched to the optical multiplexer 31_1 or the optical multiplexer 31_2.

  For example, the optical switch SW_1 is provided so as to correspond to the subcarrier transmission unit 11_1, and the optical transmission signal 21_1 output from the subcarrier transmission unit 11_1 is supplied to either the optical multiplexer 31_1 or the optical multiplexer 31_2. Output. The optical switch SW_2 is provided to correspond to the subcarrier transmission unit 11_2, and outputs the optical transmission signal 21_2 output from the subcarrier transmission unit 11_2 to either the optical multiplexer 31_1 or the optical multiplexer 31_2. To do. Each optical switch SW_1-SW_m is controlled using a control means (not shown).

  Further, the output unit may be configured using the optical multiplexer 32 and the optical demultiplexer 33 as in the output unit 12_3 included in the optical transmission device 1_6 illustrated in FIG. In this case, the optical multiplexer 32 combines and multiplexes the respective optical transmission signals 21_1 to 21_m output from the respective subcarrier transmission units 11_1 to 11_m, and the multiplexed optical signal 25 is an optical demultiplexer. To 33. The optical demultiplexer 33 selectively outputs the optical transmission signals 21_1 to 21_m included in the multiplexed optical signal 25 output from the optical multiplexer 32 to the transmission ports 13_1 and 13_2.

  For example, the optical demultiplexer 33 outputs the optical transmission signal 21_1 included in the multiplexed optical signal 25 to either the transmission port 13_1 or the transmission port 13_2. Further, the optical demultiplexer 33 outputs the optical transmission signal 21_2 included in the multiplexed optical signal 25 to either the transmission port 13_1 or the transmission port 13_2.

  For example, the optical demultiplexer 33 may selectively output each of the optical transmission signals 21_1 to 21_m included in the multiplexed optical signal 25 to the transmission ports 13_1 and 13_2 according to the wavelength.

<Embodiment 5>
Next, a fifth embodiment of the present invention will be described. FIG. 14 is a block diagram of an optical receiver 2_1 according to the fifth embodiment. As illustrated in FIG. 14, the optical reception device 2_1 according to the present embodiment includes a switching unit 42, a first reception unit 43_1, and a second reception unit 43_2. Hereinafter, the first and second receiving units may be referred to as subcarrier receiving units.

  The switching unit 42 receives the input optical reception signals 51_1 and 51_2, and selectively outputs the subcarrier reception signals 52_1 and 52_2 included therein to the first reception unit 43_1 and the second reception unit 43_2. To do. In other words, the switching unit 42 can arbitrarily and dynamically switch the output destinations of the subcarrier reception signals included in the optical reception signals 51_1 and 51_2 (first and second reception units 43_1 and 43_2). For example, the switching unit 42 is controlled using control means (not shown).

  The first receiver 43_1 receives data transmitted using the subcarrier received signal 52_1. The second receiver 43_2 receives data transmitted using the subcarrier received signal 52_2. The first receiving unit 43_1 and the second receiving unit 43_2 include a detecting unit (not shown) for detecting each of the subcarrier received signals 52_1 and 52_2. Each detector may include a local oscillator.

  In the optical receiver 2_1 according to the present embodiment, the switching unit 42, when the first subcarrier received signal 52_1 and the second subcarrier received signal 52_2 share a series of information, the first subcarrier received signal. 52_1 and the second subcarrier received signal 52_2 are received via the same path. For example, the switching unit 42 receives the optical reception signal 51_1 including the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2, and thereby receives the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_1. The subcarrier reception signal 52_2 can be received via the same route. At this time, the switching unit 42 outputs the first subcarrier reception signal 52_1 to the first reception unit 43_1 and the second subcarrier reception signal 52_2 to the second reception unit 43_2.

  On the other hand, the switching unit 42, when the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2 do not share a series of information, the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2. Are received via different routes. For example, when the optical reception signal 51_1 includes the first subcarrier reception signal 52_1 and the optical reception signal 51_2 includes the second subcarrier reception signal 52_2, the switching unit 42 selects the optical reception signal 51_1 and the optical signal. By receiving the reception signal 51_1, the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2 can be received via different paths. At this time, the switching unit 42 outputs the first subcarrier reception signal to the first reception unit 43_1, and outputs the second subcarrier reception signal to the second reception unit 43_2.

  Here, the case where the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2 share a series of information is, for example, the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2. In this case, predetermined data is transmitted in parallel.

  On the other hand, when the first subcarrier received signal 52_1 and the second subcarrier received signal 52_2 do not share a series of information, for example, the first subcarrier received signal 52_1 and the second subcarrier received signal 52_2 This is a case where predetermined data is transmitted independently. For example, the first optical transmission device (not shown) transmits the first data using the first subcarrier reception signal 52_1, and the second optical transmission device (not shown) transmits the second data to the second data. In this case, transmission is performed using the subcarrier reception signal 52_2. At this time, the optical receiver 2_1 receives the first subcarrier reception signal 52_1 transmitted from the first optical transmitter (not shown) via the first path, and the second optical transmitter ( The second subcarrier reception signal 52_2 transmitted from (not shown) is received via the second path.

  As described above, in the optical receiving device 2_1 according to the present embodiment, the first subcarrier received signal 52_1 and the second subcarrier received signal 52_2 are switched to the first receiving unit 43_1 and the second receiving unit 43_2. This is selectively output using the unit 42.

  Therefore, for the same reason as described in the first embodiment, it is possible to provide an optical receiving apparatus and an optical receiving method that can implement efficient resource allocation in an optical communication network.

<Embodiment 6>
Next, a sixth embodiment of the present invention will be described. FIG. 15 is a block diagram of an optical receiver 2_2 according to the sixth embodiment. In the sixth embodiment, a detailed configuration of the optical receiver 2_1 described in the fifth embodiment will be described. As illustrated in FIG. 15, the optical reception device 2_2 according to the present embodiment includes a plurality of reception ports 41_1 and 41_2, a switching unit 42, subcarrier reception units 43_1 to 43_m, and a signal processing unit 45.

  The plurality of reception ports (PR_1, PR_2) 41_1, 41_2 receive the multiplexed optical reception signals 50_1, 50_2 supplied to the optical reception device 2_2, and switch the received optical reception signals 51_1, 51_2, respectively. Output to. The reception ports 41_1 and 41_2 can receive optical reception signals 50_1 and 50_2 transmitted from different optical transmission apparatuses, respectively. For example, the reception port 41_1 receives an optical reception signal 50_1 transmitted from a first optical transmission device (not shown), and the reception port 41_2 receives an optical reception signal 50_2 transmitted from a second optical transmission device (not shown). Can be received.

  The switching unit 42 converts the subcarrier reception signals 52_1 to 52_m included in the optical reception signals 51_1 and 51_2 received by the plurality of reception ports 41_1 and 41_2 into a plurality of subcarrier reception units (SCR_1 to SCR_m) 43_1 to 43_1. Selectively output to 43_m. In other words, the multiplexed optical reception signals 51_1 and 51_2 are separated into the respective subcarrier reception signals 52_1 to 52_m in the switching unit 42. The separated subcarrier reception signals 52_1 to 52_m are subcarrier reception units 43_1 to 43_m corresponding to the respective subcarrier reception signals 52_1 to 52_m (that is, subcarrier reception signals having respective wavelengths can be received). To the carrier receiver). At this time, one subcarrier reception signal 52_m is input to one subcarrier reception unit 43_m.

  The switching unit 42 can arbitrarily and dynamically switch the output destinations (subcarrier reception units 43_1 to 43_m) of the respective subcarrier reception signals 52_1 to 52_m. For example, the switching unit 42 is controlled using control means (not shown).

  The subcarrier receiver 43_1 receives data transmitted using the subcarrier reception signal 52_1. The subcarrier receiving unit 43_2 receives data transmitted using the subcarrier reception signal 52_2. In this way, the subcarrier receiving unit 43_m receives each data transmitted using the subcarrier reception signal 52_m. Each of the subcarrier reception units 43_1 to 43_m includes a detection unit (not shown) for detecting each of the subcarrier reception signals 52_1 to 52_m. Each detector may include a local oscillator. That is, each of the subcarrier receivers 43_1 to 43_m causes each subcarrier receiver to interfere with the local oscillation light generated by each local oscillator and the input subcarrier reception signals 52_1 to 52_m. The subcarrier reception signals 52_1 to 52_m corresponding to 43_1 to 43_m can be received.

  Each of the subcarrier received signals 52_1 to 52_m may be modulated using a predetermined modulation method. In this case, the subcarrier receiving units 43_1 to 43_m are provided with circuits for reading data from the subcarrier received signals 52_1 to 52_m modulated by a predetermined modulation method. Examples of the predetermined modulation scheme include amplitude shift keying (ASK), frequency shift keying modulation (FSK), phase shift keying modulation (PSK), quadrature amplitude modulation (QAM), and quadrature phase shift keying (QPSK). Can do. As quadrature amplitude modulation (QAM), for example, 16QAM, 64QAM, 128QAM, 256QAM, or the like can be used.

  Also, in the optical receiving device 2_2 according to the present embodiment, each subcarrier receiving unit that has received a subcarrier received signal (optical received signal 50_1) via the receiving port 41_1 among the plurality of subcarrier receiving units 43_1 to 43_m. Can receive the first data subjected to the serial-parallel conversion in parallel. Each of the subcarrier receiving units 43_1 to 43_m that has received the subcarrier received signal (optical received signal 50_2) via the second receiving port 41_2 is subjected to serial-parallel conversion. Can be received in parallel. In other words, each of the subcarrier reception signals included in the optical reception signal 50_1 received via the reception port 41_1 shares a series of information. Each of the subcarrier reception signals included in the optical reception signal 50_2 received via the reception port 41_2 shares a series of information.

  Specifically, for example, the optical receiver 2_2 includes subcarrier receivers 43_1 to 43_10, and among these subcarrier receivers 43_1 to 43_10, the subcarrier receivers 43_1 to 43_6 receive the first data. It is assumed that the data is received via the port 41_1. In addition, it is assumed that the subcarrier receiving units 43_7 to 43_10 receive the second data via the reception port 41_2.

  In this case, the optical reception device 2_2 receives the optical reception signal 50_1 transmitted from the first optical transmission device (not shown) via the reception port 41_1. Then, the subcarrier receiving units 43_1 to 43_6 receive the subcarrier reception signals 52_1 to 52_6 included in the optical reception signal 50_1, respectively, so that the first data (the data subjected to serial / parallel conversion by the first optical transmission device) is received. ) Can be received in parallel. The first data transmitted in parallel in this way can be converted into serial data by the signal processing unit 45 in the subsequent stage.

  Similarly, the optical reception device 2_2 receives the optical reception signal 50_2 transmitted from the second optical transmission device (not shown) via the reception port 41_2. Then, the subcarrier receivers 43_7 to 43_10 receive the subcarrier reception signals 52_7 to 52_10 included in the optical reception signal 50_2, respectively, so that the second data (the data subjected to serial-parallel conversion by the second optical transmission device) is received. ) Can be received in parallel. The second data transmitted in parallel in this way can be converted into serial data by the signal processing unit 45 in the subsequent stage.

  For example, each of the subcarrier receiving units 43_1 to 43_m includes a photoelectric converter (not shown). Each photoelectric converter converts the subcarrier reception signals 52_1 to 52_m into electric signals, and outputs the electric signals to the signal processing unit 45 as reception signals 53_1 to 53_m. For example, a photodiode can be used for the photoelectric converter.

  The signal processing unit 45 performs predetermined processing on the reception signals 53_1 to 53_m output from the subcarrier reception units 43_1 to 43_m to generate data. Further, the signal processing unit 45 may compensate for the influence of mutual interference between the subcarrier reception signals 52_1 to 52_m. That is, the signal processing unit 45 simultaneously processes each of the subcarrier receiving units 43_1 to 43_m, for example, compensation for crosstalk and nonlinear optical effects (cross phase modulation (XPM), four-wave mixing (FWM), etc.). It can be performed. For example, the signal processing unit 45 controls each local oscillator included in each of the subcarrier reception units 43_1 to 43_m according to each of the subcarrier reception signals 52_1 to 52_m, so that each of the subcarrier reception signals 52_1 to 52_m. You may compensate the influence of the mutual interference between.

  In the super channel technology, a plurality of wavelengths (subcarriers) are used in one channel band, and the wavelengths are multiplexed with high density. For this reason, the influence of mutual interference between subcarriers is large. In the optical receiving apparatus according to the present embodiment, a plurality of different subcarriers are received by the same optical receiving apparatus, and adjacent subcarriers that affect one subcarrier can be monitored simultaneously. For this reason, the compensation parameter for compensating the influence of the mutual interference between the subcarrier reception signals can be set.

  In the present embodiment, the case where the optical reception device 2_2 includes two reception ports 41_1 and 41_2 has been described as an example. However, the number of reception ports included in the optical reception device 2_2 may be three or more.

  Similar to the case described in the first embodiment, the following problem occurs when the optical receiving apparatus has only one receiving port. That is, when an unused subcarrier receiving unit is generated when the optical receiving device is receiving data from a first optical transmitting device (not shown) via one receiving port, this unused The subcarrier receiving unit cannot be used, and resources are wasted. In other words, when there is only one receiving port, data cannot be received from another optical transmission device using an unused subcarrier receiving unit, and the unused subcarrier receiving unit is wasted. was there.

  Therefore, in the optical receiving device 2_2 according to the present embodiment, as shown in FIG. 15, a plurality of receiving ports 41_1 and 41_2 and a switching unit 42 are provided, and the switching unit 42 is used to provide a plurality of receiving ports 41_1 and 41_2. The subcarrier reception signals 52_1 to 52_m included in the received optical reception signals 51_1 and 51_2 are selectively output to the plurality of subcarrier reception units 43_1 to 43_m. Therefore, for example, when an unused subcarrier reception unit occurs, an optical reception signal is received from another optical transmission device (not shown) via an unused reception port, and the unused subcarrier reception unit Data can be received using this optical reception signal.

  In addition, although the case where one subcarrier reception signal 52_m is input to one subcarrier reception unit 43_m has been described above, in the optical reception device 2_2 according to the present embodiment, a plurality of subcarrier reception units 43_m are included in one subcarrier reception unit 43_m. May be configured such that a plurality of subcarrier reception signals are input and a plurality of subcarrier reception signals are selectively received by one subcarrier reception unit 43_m. In this case, a local oscillator (not shown) is provided in each of the subcarrier receiving units 43_1 to 43_m, and a local oscillation light having a specific wavelength output from the local oscillator and a plurality of subcarrier received signals (multiplexed) are input. By interfering with a subcarrier reception signal), a specific subcarrier reception signal (that is, a subcarrier reception signal corresponding to a specific wavelength) can be selectively received from a plurality of subcarrier reception signals. In this way, the configuration of the switching unit 42 can be simplified by allowing a plurality of subcarrier reception signals to be input to one subcarrier reception unit 43_m.

  With the invention according to the present embodiment described above, it is possible to provide an optical receiving apparatus and an optical receiving method capable of efficiently allocating resources in an optical communication network.

<Embodiment 7>
Next, a seventh embodiment of the present invention will be described. FIG. 16 is a block diagram showing an optical receiver 2_3 according to the present embodiment. The optical receiver 2_3 according to the present embodiment is different from the optical receiver 2_2 according to the sixth embodiment in that a plurality of subcarrier receivers share a local oscillator (LO). Since other than this is the same as the optical receiver 2_2 described in the sixth embodiment, the same components are denoted by the same reference numerals, and redundant description is omitted.

  As illustrated in FIG. 16, the optical reception device 2_3 according to the present embodiment includes a plurality of reception ports 41_1 and 41_2, a switching unit 42, subcarrier reception units 43_1 to 43_6, local oscillators 44_1 and 44_2, and a signal processing unit 45. Prepare. In the optical receiver 2_3 according to the present embodiment, a plurality of subcarrier receivers share a local oscillator. That is, the plurality of subcarrier receiving units 43_1 to 43_3 share the local oscillator 44_1. Further, the plurality of subcarrier receiving units 43_4 to 43_6 share the local oscillator 44_2. In the example shown in FIG. 16, the number of subcarrier receivers is six (m = 6), but the number of subcarrier receivers may be other than this. At this time, the number of local oscillators can be increased according to the number of subcarrier receivers. In the example shown in FIG. 16, an example in which one local oscillator is shared by three subcarrier receivers is shown, but the number of subcarrier receivers sharing one local oscillator may be two. It may be four or more.

  The switching unit 42 selectively transmits each of the subcarrier reception signals 52_1 to 52_6 included in each of the optical reception signals 51_1 and 51_2 received by the plurality of reception ports 41_1 and 41_2 to the plurality of subcarrier reception units 43_1 to 43_6. Output. In other words, the multiplexed optical reception signals 51_1 and 51_2 are separated into the respective subcarrier reception signals 52_1 to 52_6 in the switching unit 42. Then, the separated subcarrier reception signals 52_1 to 52_6 are output to the subcarrier reception units 43_1 to 43_6 corresponding to the subcarrier reception signals 52_1 to 52_6, respectively. At this time, one subcarrier reception signal is input to one subcarrier reception unit.

  The switching unit 42 can arbitrarily and dynamically switch the output destination of each of the subcarrier reception signals 52_1 to 52_6. For example, the switching unit 42 is controlled using control means (not shown).

  The subcarrier receivers 43_1 to 43_6 receive the data transmitted using the subcarrier reception signals 52_1 to 52_6. Each of the subcarrier reception units 43_1 to 43_6 includes a detection unit (not shown) for detecting each of the subcarrier reception signals 52_1 to 52_6. At this time, the detector included in each of the subcarrier receivers 43_1 to 43_6 can perform detection using the local oscillation light output from the local oscillators 44_1 and 44_2.

  That is, the subcarrier receiving units 43_1 to 43_3 can detect the respective subcarrier received signals 52_1 to 52_3 using the local oscillation light output from the local oscillator 44_1. At this time, the local oscillator 44_1 generates local oscillation light having a wavelength corresponding to each of the subcarrier reception signals 52_1 to 52_3 (a wavelength that interferes with each of the subcarrier reception signals 52_1 to 52_3). That is, when the wavelengths of the subcarrier reception signals 52_1 to 52_3 are close to each other, even if the local oscillation light output from the local oscillator 44_1 is local oscillation light having a single wavelength, each subcarrier reception signal is received. The signals 52_1 to 52_3 interfere with the local oscillation light. Therefore, each of the subcarrier reception units 43_1 to 43_3 can detect each of the subcarrier reception signals 52_1 to 52_3 using the local oscillation light output from the local oscillator 44_1.

  Similarly, the subcarrier reception units 43_4 to 43_6 can detect the respective subcarrier reception signals 52_4 to 52_6 using the local oscillation light output from the local oscillator 44_2. At this time, the local oscillator 44_2 generates local oscillation light having a wavelength corresponding to each of the subcarrier reception signals 52_4 to 52_6 (a wavelength that interferes with each of the subcarrier reception signals 52_4 to 52_6). That is, when the wavelengths of the subcarrier reception signals 52_4 to 52_6 are close to each other, even if the local oscillation light output from the local oscillator 44_2 is local oscillation light having a single wavelength, each subcarrier reception is received. The signals 52_4 to 52_6 interfere with the local oscillation light. Therefore, each of the subcarrier receiving units 43_4 to 43_6 can detect each of the subcarrier received signals 52_4 to 52_6 using the local oscillation light output from the local oscillator 44_2. For example, the local oscillators 44_1 and 44_2 can be configured using laser diodes.

  For example, each of the subcarrier receiving units 43_1 to 43_6 includes a photoelectric converter (not shown). Each photoelectric converter converts the subcarrier reception signals 52_1 to 52_6 into electric signals, and outputs the electric signals to the signal processing unit 45 as reception signals 53_1 to 53_6. For example, a photodiode can be used for the photoelectric converter.

  The signal processing unit 45 performs predetermined processing on the reception signals 53_1 to 53_6 output from the subcarrier reception units 43_1 to 43_6 to generate data. The signal processing unit 45 can control the local oscillators 44_1 and 44_2 in accordance with the reception signals 53_1 to 53_6 output from the subcarrier reception units 43_1 to 43_6. In other words, the local oscillators 44_1 and 44_2 are controlled according to the subcarrier reception signals 52_1 to 52_6 included in the optical reception signals 51_1 and 51_2.

  For example, when the subcarrier reception signals corresponding to the plurality of subcarrier reception units are not included in the optical reception signals 51_1 and 51_2, the signal processing unit 45 turns off the local oscillator shared by the plurality of subcarrier reception units. It is good. Specifically, when all of the subcarrier reception signals 52_1 to 52_3 corresponding to the subcarrier reception units 43_1 to 43_3 are not included in the optical reception signals 51_1 and 51_2, the subcarrier reception signals 43_1 to 43_3 are shared. The local oscillator 44_1 can be turned off. Similarly, when all of the subcarrier reception signals 52_4 to 52_6 corresponding to the subcarrier reception units 43_4 to 43_6 are not included in the optical reception signals 51_1 and 51_2, the local oscillator shared by the subcarrier reception units 43_4 to 43_6 44_2 can be turned off. By such control, an unnecessary local oscillator can be turned off, and the power consumption of the optical receiver 2_3 can be reduced.

  Similarly to the case of the sixth embodiment, the signal processing unit 45 simultaneously processes a plurality of subcarrier reception signals, for example, crosstalk compensation and nonlinear optical effects (cross phase modulation (XPM), four-wave mixing). (FWM) etc.) can be performed.

  With the invention according to the present embodiment described above, it is possible to provide an optical receiving apparatus and an optical receiving method capable of efficiently allocating resources in an optical communication network.

<Eighth embodiment>
Next, an eighth embodiment of the present invention will be described. FIG. 17 is a block diagram showing an optical receiver 2_4 according to the present embodiment. In the optical receiver 2_4 according to the present embodiment, a specific configuration example of the switching unit 42 included in the optical receivers 2_1 to 2_3 described in the fifth to seventh embodiments is illustrated. Other than this, it is the same as the optical receivers 2_1 to 2_3 described in the fifth to seventh embodiments. Therefore, the same components are denoted by the same reference numerals, and redundant description is omitted.

  As illustrated in FIG. 17, the switching unit 42_1 included in the optical receiver 2_4 according to the present embodiment includes optical splitters 60_1 and 60_2 and an optical switch 61. The optical branching devices 60_1 and 60_2 are provided so as to correspond to the respective receiving ports 41_1 and 41_2, branch the optical reception signals 51_1 and 51_2 received by the respective receiving ports 41_1 and 41_2, and output them to the optical changeover switch 61. To do.

  The optical changeover switch 61 receives the optical reception signals branched by the optical branching devices 60_1 and 60_2, and selectively outputs them to the subcarrier reception units 43_1 to 43_m. For example, the optical changeover switch 61 can be configured using an optical matrix switch having m × 2 inputs and m outputs. Here, the m output of the optical changeover switch 61 corresponds to the number of subcarrier receiving units 43_1 to 43_m. For example, the light changeover switch 61 is controlled using a control means (not shown).

  As described above, in the optical receiving device 2_4 according to the present embodiment, the switching unit 42_1 is configured by using the optical branching devices 60_1 and 60_2 and the optical switch 61. Therefore, the subcarrier reception signals 52_1 to 52_m supplied to the respective subcarrier reception units 43_1 to 43_m can be dynamically switched.

  Note that the optical changeover switch 61 may be configured using a plurality of optical switches SW_1 to SW_m, like the switching unit 42_2 included in the optical reception device 2_5 illustrated in FIG. In this case, the optical switches SW_1 to SW_m are provided so as to correspond to the respective subcarrier reception units 43_1 to 43_m, and receive each subcarrier from the optical reception signals branched by the respective optical branching devices 60_1 and 60_2. The optical reception signals to be output to the units 43_1 to 43_m are selected and output.

  For example, the optical switch SW_1 is provided so as to correspond to the subcarrier reception unit 43_1, and the subcarrier reception signal corresponding to the subcarrier reception unit 43_1 among the optical reception signals branched by the optical branching units 60_1 and 60_2. 52_1 is selected, and the selected subcarrier reception signal 52_1 is output to the subcarrier reception unit 43_1. The optical switch SW_2 is provided so as to correspond to the subcarrier reception unit 43_2, and the subcarrier reception signal 52_2 corresponding to the subcarrier reception unit 43_2 is selected from the optical reception signals branched by the optical branching units 60_1 and 60_2. The selected subcarrier reception signal 52_2 is output to the subcarrier reception unit 43_2. Each optical switch SW_1-SW_m is controlled using a control means (not shown). For example, the optical switches SW_1 to SW_m can be configured by wavelength selective optical switches.

  For example, as in the optical receiver described in the second half of the sixth embodiment, if each of the subcarrier receiving units 43_1 to 43_m can selectively receive a specific subcarrier received signal, one A plurality of subcarrier reception signals may be input to the subcarrier reception unit 43_m. In this case, for example, each of the optical switches SW_1 to SW_m can output a plurality of subcarrier reception signals to one subcarrier reception unit 43_m.

  Further, the switching unit may be configured by using an optical multiplexer 62 and an optical demultiplexer 63 as in the switching unit 42_3 provided in the optical receiving device 2_6 illustrated in FIG. The optical multiplexer 62 combines and multiplexes the optical reception signals 51_1 and 51_2 received at the reception ports 41_1 and 41_2, and outputs the multiplexed optical signal 64 to the optical demultiplexer 63. The optical demultiplexer 63 selectively outputs each of the subcarrier reception signals 52_1 to 52_m included in the multiplexed optical signal 64 to each of the subcarrier reception units 43_1 to 43_m.

  That is, the optical demultiplexer 63 outputs the subcarrier reception signal 52_1 included in the multiplexed optical signal 64 to the subcarrier reception unit 43_1. In addition, the optical demultiplexer 63 outputs the subcarrier reception signal 52_2 included in the multiplexed optical signal 64 to the subcarrier reception unit 43_2.

  For example, the optical demultiplexer 63 selectively outputs each of the subcarrier reception signals 52_1 to 52_m included in the multiplexed optical signal 64 to the subcarrier reception units 43_1 to 43_m according to the wavelength. Can do. In this case, the optical demultiplexer 63 can be configured using the wavelength selective optical demultiplexer 63.

  For example, as in the optical receiver described in the second half of the sixth embodiment, if each of the subcarrier receiving units 43_1 to 43_m can selectively receive a specific subcarrier received signal, one A plurality of subcarrier reception signals may be input to the subcarrier reception unit 43_m. In this case, for example, the optical demultiplexer 62 can output a plurality of subcarrier reception signals included in the multiplexed optical signal 63 to one subcarrier reception unit 43_m. For example, an optical branching device may be used instead of the optical branching filter 63.

<Embodiment 9>
Next, a ninth embodiment of the present invention will be described. FIG. 20 is a block diagram showing the optical communication device 3 according to the present embodiment. The optical communication device 3 according to the present embodiment is an optical communication device capable of transmitting and receiving, and is configured by combining the optical transmission device 1_1 described in the first embodiment and the optical reception device 2_1 described in the fifth embodiment. ing.

  As illustrated in FIG. 20, the optical communication device 3 according to the present embodiment includes a first transmission unit 11_1, a second transmission unit 11_2, an output unit 12, a switching unit 42, a first reception unit 43_1, and a first transmission unit 11_1. 2 receiving units 43_2. The optical transmission signal 22_1 and the optical reception signal 51_1 are configured to be able to be transmitted / received via the first path. Further, the optical transmission signal 22_2 and the optical reception signal 51_2 are configured to be able to be transmitted and received through the second path.

  Note that the configurations and operations of the first transmission unit 11_1, the second transmission unit 11_2, and the output unit 12 are the same as those of the optical transmission device 1_1 described in the first embodiment, and thus redundant description is omitted. To do. In addition, the configuration and operation of the switching unit 42, the first receiving unit 43_1, and the second receiving unit 43_2 are the same as those of the optical receiving device 2_1 described in the fifth embodiment, and thus redundant description is omitted. To do.

  Also, in the optical communication device 3 according to the present embodiment, the configurations of the optical transmission devices 1_2 to 1_6 described in the second to fourth embodiments may be applied, and the light described in the sixth to eighth embodiments. The configuration of the receiving devices 2_2 to 2_6 may be applied.

  From the invention according to the present embodiment described above, it is possible to provide an optical communication apparatus and an optical communication method capable of efficiently allocating resources in an optical communication network.

<Embodiment 10>
Next, an embodiment 10 of the invention will be described. FIG. 21 is a block diagram showing an optical communication system according to the present embodiment. As shown in FIG. 21, the optical communication system according to the present embodiment includes an optical transmission device 1 and optical reception devices 70_1 and 70_2 that communicate with the optical transmission device 1. As the optical transmission device 1, the optical transmission devices 1_1 to 1_6 described in the first to fourth embodiments can be used.

  The optical transmission device 1 includes a plurality of subcarrier transmission units 11_1 to 11_m, an output unit 12, and transmission ports 13_1 and 13_2. The plurality of subcarrier transmission units 11_1 to 11_m generate optical transmission signals 21_1 to 21_m that transmit data using subcarriers, respectively. The output unit 12 selectively outputs each of the optical transmission signals 21_1 to 21_m output from the plurality of subcarrier transmission units 11_1 to 11_m to the transmission port 13_1 or the transmission port 13_2. Note that the configuration and operation of the optical transmission device 1 are the same as those of the optical transmission devices 1_1 to 1_6 described in the first to fourth embodiments, and thus redundant description is omitted.

  The transmission port 13_1 is connected to the reception port 71_1 of the optical receiver 70_1 via an optical fiber, and the transmission port 13_2 is connected to the reception port 71_2 of the optical receiver 70_2 via an optical fiber. The optical transmission device 1 transmits the optical transmission signal 23_1 to the optical reception device 70_1 via the transmission port 13_1. Further, the optical transmission device 1 transmits the optical transmission signal 23_2 to the optical reception device 70_2 via the transmission port 13_2. The optical transmission signal 23_1 is a signal obtained by multiplexing a plurality of optical transmission signals 21_m. The receiving unit 72_1 included in the optical receiving device 70_1 is configured to be able to receive such multiplexed optical transmission signals. Similarly, the optical transmission signal 23_2 is a signal obtained by multiplexing a plurality of optical transmission signals 21_m. The receiver 72_2 included in the optical receiver 70_2 is configured to be able to receive such multiplexed optical transmission signals.

  Of the plurality of subcarrier transmission units 11_1 to 11_m, each subcarrier transmission unit that transmits an optical transmission signal via the transmission port 13_1 transmits the first data subjected to serial-parallel conversion to the optical reception device 70_1 in parallel. May be. In addition, each of the subcarrier transmission units that transmit the optical transmission signal via the transmission port 13_2 among the plurality of subcarrier transmission units 11_1 to 11_m receives the second data subjected to serial-parallel conversion in parallel with the optical reception device 70_2. You may send it.

  That is, the optical transmission device 1 performs serial-parallel conversion on the first data to be transmitted to the optical reception device 70_1, and generates an optical transmission signal for transmitting each of the serial-parallel converted data at the subcarrier transmission unit. To the optical receiver 70_1. The optical receiver 70_1 receives the serial-parallel converted data included in the optical transmission signal 23_1, and obtains the parallel-serial converted first data by parallel-serial conversion of the received serial-parallel converted data. can do. The same applies to the second data transmitted to the optical receiver 70_2.

  In the optical communication system according to the present embodiment, the transmission capacity between the optical transmission device 1 and the optical reception device 70_1 is equal to the number of subcarrier transmission units 11_1 to 11_m that output optical transmission signals to the transmission port 13_1. To be determined. Similarly, the transmission capacity between the optical transmission device 1 and the optical reception device 70_2 is determined based on the number of subcarrier transmission units 11_1 to 11_m that output optical transmission signals to the transmission port 13_2. In other words, the ratio between the transmission capacity of the optical transmission signal 23_1 and the transmission capacity of the optical transmission signal 23_2 is the number of subcarrier transmission units connected to the transmission port 13_1 and the number of subcarrier transmission units connected to the transmission port 13_2. Corresponds to the ratio. For example, when increasing the transmission capacity between the optical transmission device 1 and the optical reception device 70_1, the output unit 12 is controlled to increase the number of subcarrier transmission units connected to the transmission port 13_1.

  Further, subcarriers in the first wavelength band may be used for transmission between the optical transmission device 1 and the optical reception device 70_1, and second transmission is used for transmission between the optical transmission device 1 and the optical reception device 70_2. Subcarriers in the wavelength band may be used. Here, the first wavelength band and the second wavelength band are bands in which the wavelengths do not overlap each other. For example, these wavelength bands are C band, L band, S band, etc. used in WDM.

  The communication setting between the optical transmission device 1 and the optical reception device 70_1 includes the distance between the optical transmission device 1 and the optical reception device 70_1, the communication time zone, and the optical transmission device 1 and the optical reception device. You may determine according to at least one of the states of the transmission path | route between 70_1. Further, the optical transmission device 1 and the optical reception device 70_1 are used by using at least one of the subcarrier wavelength band allocation, the optical signal path, and the modulation method in the communication between the optical transmission device 1 and the optical reception device 70_1. You may also set up communication with The same applies to the communication setting between the optical transmitter 1 and the optical receiver 70_2.

  For example, as the communication distance between the optical transmission device 1 and the optical reception device 70_1 becomes longer, the multilevel per one subcarrier may be decreased and the number of subcarriers may be increased. Conversely, as the communication distance between the optical transmission device 1 and the optical reception device 70_1 becomes shorter, the multilevel per one subcarrier may be increased and the number of subcarriers may be decreased.

  The case where quadrature amplitude modulation (QAM) is used will be specifically described as an example. When the communication distance between the optical transmitter 1 and the optical receiver 70_1 is long, one modulation scheme such as 128QAM or 256QAM is used. Increasing the multilevel per subcarrier increases the bit error rate. Therefore, in this case, the multilevel per one subcarrier is reduced by using a modulation method such as 16QAM or 64QAM. In this case, since the amount of information contained in one subcarrier is reduced, the number of subcarriers is increased by this amount.

  On the other hand, when the communication distance between the optical transmission device 1 and the optical reception device 70_1 is short, the multilevel per one subcarrier can be increased using a modulation scheme such as 128QAM or 256QAM. In this case, since the amount of information contained in one subcarrier can be increased, the number of subcarriers can be decreased by this amount.

  Further, for example, when the transmission path between the optical transmission device 1 and the optical reception device 70_1 deteriorates (for example, when tension is applied to the optical fiber), for example, the multilevel per one subcarrier is decreased. Also good. Thus, by reducing the multilevel per subcarrier, an increase in bit error rate can be suppressed.

  The communication arrangement in the optical communication system as described above can be determined by the optical transmission device 1 and the optical reception devices 70_1 and 70_1.

  The invention according to the present embodiment described above can provide an optical communication system and an optical communication system control method capable of efficiently allocating resources in an optical communication network.

<Embodiment 11>
Next, an eleventh embodiment of the present invention will be described. FIG. 22 is a block diagram showing an optical communication system according to the present embodiment. As illustrated in FIG. 22, the optical communication system according to the present embodiment includes an optical transmission device 1, optical reception devices 70_1 and 70_2 that communicate with the optical transmission device 1, and a controller 80. The optical communication system according to the present embodiment is the same as the optical communication system described in the tenth embodiment except that the controller 80 is provided. Also in the present embodiment, the optical transmitters 1_1 to 1_6 described in the first to fourth embodiments can be used as the optical transmitter 1.

  The controller 80 is provided to control the optical transmitter 1 and the optical receivers 70_1 and 70_2, respectively. That is, the controller 80 controls the optical transmission device 1 and the optical reception devices 70_1 and 70_2 according to the communication state between the optical transmission device 1 and the optical reception device 70_1 and the communication state between the optical transmission device 1 and the optical reception device 70_2. Can do.

  FIG. 23 is a block diagram illustrating a configuration example of the controller 80. As shown in FIG. 23, the controller 80 includes a monitoring unit 81 and a setting unit 82. The monitoring unit 81 monitors the communication state of the optical communication system, that is, the communication state of the optical transmitter 1 and the optical receiver 70_1 and the communication state of the optical transmitter 1 and the optical receiver 70_2. The setting unit 82 sets the optical transmission device 1 and the optical reception devices 70_1 and 70_2, respectively, according to the monitoring result in the monitoring unit 81.

  The controller 80 can set a subcarrier transmission unit used for communication between the optical transmission device 1 and the optical reception device 70_1 and a subcarrier transmission unit used for communication between the optical transmission device 1 and the optical reception device 70_2. At this time, the controller 80 can change the subcarrier transmission unit used in communication with each of the optical reception devices 70_1 and 70_2 by changing the setting of the output unit 12 included in the optical transmission device 1.

  For example, the controller 80 controls the number of subcarrier transmission units 11_1 to 11_m that output optical transmission signals to the transmission ports 13_1 and 13_2, thereby allowing transmission capacity and optical transmission between the optical transmission device 1 and the optical reception device 70_1. The transmission capacity between the device 1 and the optical receiver 70_2 can be changed.

  The controller 80 also sets the subcarrier wavelength band used for communication between the optical transmitter 1 and the optical receiver 70_1 and the subcarrier wavelength band used for communication between the optical transmitter 1 and the optical receiver 70_2. Can do. For example, the controller 80 communicates between the optical transmitter 1 and the optical receiver 70_1 so that subcarriers in the first wavelength band are used for communication between the optical transmitter 1 and the optical receiver 70_1. Can be set so that subcarriers in the second wavelength band are used. Here, the first wavelength band and the second wavelength band are bands in which the wavelengths do not overlap each other. For example, these wavelength bands are C band, L band, S band, etc. used in WDM.

  Further, the controller 80 responds to at least one of the distance between the optical transmission device 1 and the optical reception device 70_1, the communication time zone, and the state of the transmission path between the optical transmission device 1 and the optical reception device 70_1. Thus, communication between the optical transmitter 1 and the optical receiver 70_1 can be set. In addition, the controller 80 uses at least one of the subcarrier wavelength band assignment, the optical signal path, and the modulation scheme in the communication between the optical transmission device 1 and the optical reception device 70_1, and Communication with the receiving device 70_1 may be set. The same applies to the communication setting between the optical transmitter 1 and the optical receiver 70_2.

  For example, the controller 80 may decrease the multilevel per one subcarrier and increase the number of subcarriers as the communication distance between the optical transmitting device 1 and the optical receiving device 70_1 increases. Conversely, as the communication distance between the optical transmission device 1 and the optical reception device 70_1 becomes shorter, the multilevel per one subcarrier may be increased and the number of subcarriers may be decreased. The same applies to the modulation method in the communication between the optical transmitter 1 and the optical receiver 70_2.

  In addition, the controller 80 reduces the multilevel per subcarrier, for example, when the transmission path between the optical transmitter 1 and the optical receiver 70_1 deteriorates (for example, when tension is applied to the optical fiber). You may let them. Thus, by reducing the multilevel per subcarrier, an increase in bit error rate can be suppressed. The same applies to the modulation method in the communication between the optical transmitter 1 and the optical receiver 70_2.

  In this embodiment, an optical communication system including one optical transmission device and two optical reception devices has been described as an example. However, the optical transmission device and the optical reception device that constitute the optical communication system are further provided. Also good. Also in this case, the controller 80 can set the optical transmitter and the optical receiver so that the entire optical communication system is in an optimal communication state.

  Here, the optimum communication state can be arbitrarily determined according to the user. For example, a communication state that minimizes communication costs and a communication state that maximizes communication reliability (that is, a communication state where communication is given the highest priority that communication is not interrupted, taking into account redundant paths) A communication state in which communication speed is emphasized (a communication state in which the shortest path is always the shortest), a communication state in which wavelength use efficiency is maximized, and the like.

  The controller 80 also collects information on changes in the network status (for example, failures in the optical transmission path and degradation of optical communication signals) reported from the optical transmitter and receiver, and follows the changes in the network status. As described above, the optical transmission device and the optical reception device can be reset so that the entire optical communication system is in an optimal communication state.

  The invention according to the present embodiment described above can provide an optical communication system and an optical communication system control method capable of efficiently allocating resources in an optical communication network. In addition, it is possible to provide an optical communication system and an optical communication system control method in which the entire optical communication system is in an optimal communication state.

<Embodiment 12>
Next, an embodiment 12 of the invention will be described. In the present embodiment, a case where the optical communication system according to the present invention is applied to a centralized control type network will be described. FIG. 24 is a block diagram showing an optical communication system according to the present embodiment. As shown in FIG. 24, the optical communication system according to the present embodiment includes a controller 80 and a plurality of nodes A to D (85_a to 85_d). The controller 80 corresponds to the controller 80 described in the eleventh embodiment. A plurality of nodes A to D (85_a to 85_d) are elements constituting the communication network. For example, the optical transmitters 1_1 to 1_6 described in the first to fourth embodiments, the optical receivers 2_1 to 2_6 described in the fifth to eighth embodiments, or the implementation of the nodes A to D (85_a to 85_d) The optical communication device 3 described in Embodiment 9 can be used.

  The controller 80 monitors the communication states of the nodes 85_a to 85_d and controls the nodes 85_a to 85_d according to the communication states of the nodes 85_a to 85_d. The controller 80 outputs control signals 86_a to 86_d for controlling the nodes 85_a to 85_d to the nodes 85_a to 85_d.

  The controller 80 can make an arrangement for resource allocation (for example, an arrangement for a subcarrier transmitting / receiving unit to be used) and an optical signal path for each node 85_a to 85_d. For example, the controller 80 can change the transmission capacity between the node 85_a and the node 85_b by determining a subcarrier to be used for communication between the node 85_a and the node 85_b.

  In addition, the controller 80 can set the wavelength band of the subcarrier used for communication between the nodes 85_a to 85_d. For example, the controller 80 uses the subcarrier of the first wavelength band for communication between the node 85_a and the node 85_b, and uses the second wavelength band for communication between the node 85_a and the node 85_d. It can be set so that subcarriers are used. Here, the first wavelength band and the second wavelength band are bands in which the wavelengths do not overlap each other. For example, these wavelength bands are C band, L band, S band, etc. used in WDM.

  Further, the controller 80 sets communication between the nodes 85_a to 85_d according to at least one of the distance between the nodes 85_a to 85_d, the communication time zone, and the state of the transmission path between the nodes 85_a to 85_d. It can be performed. Here, the time zone for communication is, for example, a predetermined time zone (day and night), a predetermined time, a time zone of a predetermined event (execution of backup, etc.), and the like. In addition, the controller 80 sets communication between the nodes 85_a to 85_d by using at least one of the allocation of the subcarrier wavelength band, the optical signal path, and the modulation method in the communication between the nodes 85_a to 85_d. May be.

  For example, the controller 80 may decrease the multilevel per subcarrier and increase the number of subcarriers as the communication distance between the node 85_a and the node 85_b increases. Conversely, as the communication distance between the node 85_a and the node 85_b becomes shorter, the multilevel per one subcarrier may be increased and the number of subcarriers may be decreased. The same applies to the modulation method between other nodes.

  In addition, the controller 80 may decrease the multilevel per subcarrier, for example, when the transmission path between the node 85_a and the node 85_b deteriorates (for example, when tension is applied to the optical fiber). . Thus, by reducing the multilevel per subcarrier, an increase in bit error rate can be suppressed. The same applies to the modulation method between other nodes.

  In the present embodiment, an optical communication system including four nodes 85_a to 85_d is described as an example, but the number of nodes constituting the optical communication system may be more than this.

  The controller 80 can set the optical transmitter and the optical receiver so that the entire optical communication system is in an optimal communication state. Here, the optimum communication state can be arbitrarily determined according to the user. For example, a communication state that minimizes communication costs and a communication state that maximizes communication reliability (that is, a communication state where communication is given the highest priority that communication is not interrupted, taking into account redundant paths) A communication state in which communication speed is emphasized (a communication state in which the shortest path is always the shortest), a communication state in which wavelength use efficiency is maximized, and the like.

  The controller 80 also collects information on changes in the network status (for example, failures in the optical transmission path and degradation of optical communication signals) reported from the optical transmitter and receiver, and follows the changes in the network status. As described above, the optical transmission device and the optical reception device can be reset so that the entire optical communication system is in an optimal communication state.

  For example, when data is transmitted from the node 85_a to the node 85_b through the shortest path 87_1, when a failure occurs in the shortest path 87_1, the controller 80 sets the node 85_a and the node 85_d so that communication is not interrupted. It is possible to switch to a redundant path for transmitting data to the node 85_b via the connecting path 87_2, the path 87_3 connecting the node 85_d and the node 85_c, and the path 87_4 connecting the node 85_c and the node 85_b.

  The invention according to the present embodiment described above can provide an optical communication system and an optical communication system control method capable of efficiently allocating resources in an optical communication network. In addition, it is possible to provide an optical communication system and an optical communication system control method in which the entire optical communication system is in an optimal communication state.

<Embodiment 13>
Next, an embodiment 13 of the invention will be described. FIG. 25 is a block diagram showing an optical communication system according to the present embodiment. As shown in FIG. 25, the optical communication system according to the present embodiment includes an optical receiver 2 and optical transmitters 75_1 and 75_2 that communicate with the optical receiver 2. As the optical receiver 2, the optical receivers 2_1 to 2_6 described in the fifth to eighth embodiments can be used.

  The optical reception device 2 includes reception ports 41_1 and 41_2, a switching unit 42, and a plurality of subcarrier reception units 43_1 to 43_m. The reception ports 41_1 and 41_2 receive the multiplexed optical reception signals 50_1 and 50_2, respectively. The switching unit 42 selectively outputs the subcarrier reception signals 52_1 to 52_m included in the optical reception signals 51_1 and 51_2 received by the reception ports 41_1 and 41_2 to the plurality of subcarrier reception units 43_1 to 43_m. The plurality of subcarrier reception units 43_1 to 43_m receive each data included in the subcarrier reception signals 52_1 to 52_m. Note that the configuration and operation of the optical receiving device 2 are the same as those of the optical receiving devices 2_1 to 2_6 described in the fifth to eighth embodiments, and thus redundant description is omitted.

  The transmission unit 77_1 included in the optical transmission device 75_1 is configured to be able to transmit multiplexed optical transmission signals generated using a plurality of subcarriers. The transmitter 77_2 included in the optical transmitter 75_2 is configured to be able to transmit multiplexed optical transmission signals generated using a plurality of subcarriers. The reception port 41_1 is connected to the transmission port 76_1 of the optical transmission device 75_1 via an optical fiber, and the reception port 41_2 is connected to the transmission port 76_2 of the optical transmission device 75_2 via an optical fiber. The optical receiver 2 receives the optical reception signal 50_1 transmitted from the optical transmitter 75_1 via the reception port 41_1. The optical receiver 2 receives the optical reception signal 50_2 transmitted from the optical transmitter 75_2 via the reception port 41_2.

  At this time, each of the subcarrier receivers 43_1 to 43_m that receives the optical reception signal via the reception port 41_1 receives the first data (serial-parallel conversion) transmitted from the optical transmitter 75_1. Data) may be received in parallel. Each of the subcarrier receivers 43_1 to 43_m that receives the optical reception signal via the reception port 41_2 receives the second data (serial-parallel converted) transmitted from the optical transmitter 75_2. Data) may be received in parallel.

  That is, the optical transmission device 75_1 performs serial-parallel conversion on the first data to be transmitted to the optical reception device 2, and transmits each data subjected to the serial-parallel conversion to the optical reception device 2 using each optical transmission signal. . The optical receiving device 2 receives the subcarrier reception signal included in the optical transmission signal (that is, the optical reception signal 50_1) transmitted from the optical transmission device 75_1 by the subcarrier reception unit. And the 1st data by which parallel-serial conversion was carried out can be acquired by carrying out parallel-serial conversion of the data contained in a subcarrier received signal. The same applies to the second data transmitted from the optical transmission device 75_2 to the optical reception device 2.

  In the optical communication system according to the present embodiment, the transmission capacity between the optical receiver 2 and the optical transmitter 75_1 corresponds to the number of subcarrier receivers connected to the reception port 41_1. Similarly, the transmission capacity between the optical receiver 2 and the optical transmitter 75_2 corresponds to the number of subcarrier receivers connected to the reception port 41_2. For example, when increasing the transmission capacity between the optical receiver 2 and the optical transmitter 75_1, the switching unit 42 is controlled to increase the number of subcarrier receivers connected to the reception port 41_1.

  Further, subcarriers in the first wavelength band may be used for transmission between the optical receiver 2 and the optical transmitter 75_1, and for transmission between the optical receiver 2 and the optical transmitter 75_2, the first wavelength band subcarrier may be used. Subcarriers in two wavelength bands may be used. Here, the first wavelength band and the second wavelength band are bands in which the wavelengths do not overlap each other. For example, these wavelength bands are C band, L band, S band, etc. used in WDM.

  The communication setting between the optical receiver 2 and the optical transmitter 75_1 includes the distance between the optical receiver 2 and the optical transmitter 75_1, the communication time zone, and the optical receiver 2 and the optical transmitter. You may determine according to at least one of the states of the transmission path | route between 75_1. Also, the optical receiver 2 and the optical transmitter 75_1 are used by using at least one of the subcarrier wavelength band assignment, the optical signal path, and the modulation method in the communication between the optical receiver 2 and the optical transmitter 75_1. You may also set up communication with The same applies to the communication setting between the optical receiver 2 and the optical transmitter 75_2.

  For example, as the communication distance between the optical receiver 2 and the optical transmitter 75_1 increases, the multilevel per one subcarrier may be decreased and the number of subcarriers may be increased. On the contrary, as the communication distance between the optical receiver 2 and the optical transmitter 75_1 becomes shorter, the multilevel per one subcarrier may be increased and the number of subcarriers may be decreased. The same applies to the modulation method in the communication between the optical receiver 2 and the optical transmitter 75_2.

  Further, for example, when the transmission path between the optical receiver 2 and the optical transmitter 75_1 deteriorates (for example, when tension is applied to the optical fiber), for example, the multilevel per subcarrier is reduced. Also good. Thus, by reducing the multilevel per subcarrier, an increase in bit error rate can be suppressed.

  The communication arrangement in the optical communication system as described above may be determined by the optical receiver 2 and the optical transmitters 75_1 and 75_1. Further, the optical communication system according to the present embodiment may include a controller like the optical communication system described in the eleventh embodiment. Also in the present embodiment, the controller receives the optical receiver 2 and the optical transmitters 75_1 and 75_2 in accordance with the communication state between the optical receiver 2 and the optical transmitter 75_1 and the communication state between the optical receiver 2 and the optical transmitter 75_2. May be controlled.

  The invention according to the present embodiment described above can provide an optical communication system and an optical communication system control method capable of efficiently allocating resources in an optical communication network.

<Embodiment 14>
Next, a fourteenth embodiment of the present invention will be described. FIG. 26 is a block diagram showing an optical communication system according to the present embodiment. As shown in FIG. 26, the optical communication system according to the present embodiment includes optical transmission devices 1a and 1b and optical reception devices 2a and 2b.

  The optical transmission device 1a includes a plurality of subcarrier transmission units 11a, an output unit 12a, and transmission ports 13_1a and 13_2a. The optical transmission device 1b includes a plurality of subcarrier transmission units 11b, an output unit 12b, and transmission ports 13_1b and 13_2b. As the optical transmitters 1a and 1b, the optical transmitters 1_1 to 1_6 described in the first to fourth embodiments can be used. For example, the subcarrier transmission units 11a and 11b correspond to the plurality of subcarrier transmission units 11_1 to 11_m in FIG. 5, the output units 12a and 12b correspond to the output unit 12 in FIG. 5, and the transmission port 13_1a. , 13_2a, 13_1b, and 13_2b correspond to the transmission ports 13_1 and 13_2 in FIG.

  The optical receiving device 2a includes receiving ports 41_1a and 41_2a, a switching unit 42a, and a plurality of subcarrier receiving units 43a. The optical receiving device 2b includes receiving ports 41_1b and 41_2b, a switching unit 42b, and a plurality of subcarrier receiving units 43b. As the optical receivers 2a and 2b, the optical receivers 2_1 to 2_6 described in the fifth to eighth embodiments can be used. For example, the reception ports 41_1a, 41_2a, 41_1b, and 41_2b correspond to the reception ports 41_1 and 41_2 in FIG. 15, the switching units 42a and 42b correspond to the switching unit 42 in FIG. 15, and the subcarrier reception units 43a, 43a, 43b corresponds to the subcarrier receivers 43_1 to 43_m in FIG.

  As shown in FIG. 26, the transmission port 13_1a of the optical transmission device 1a is connected to the reception port 41_1a of the optical reception device 2a. The transmission port 13_2a of the optical transmission device 1a is connected to the reception port 41_1b of the optical reception device 2b. The transmission port 13_1b of the optical transmission device 1b is connected to the reception port 41_2a of the optical reception device 2a. The transmission port 13_2b of the optical transmission device 1b is connected to the reception port 41_2b of the optical reception device 2b.

  At this time, the optical transmission device 1a transmits data to the optical reception device 2a using the optical transmission signal 23_1a generated using a plurality of subcarriers in the first wavelength band. The optical transmission device 1a transmits data to the optical reception device 2b using the optical transmission signal 23_2a generated using a plurality of subcarriers in the second wavelength band. In addition, the optical transmission device 1b transmits data to the optical reception device 2a using the optical transmission signal 23_1b generated using a plurality of subcarriers in the second wavelength band. The optical transmission device 1b transmits data to the optical reception device 2b using the optical transmission signal 23_2b generated using a plurality of subcarriers in the first wavelength band. Here, the first wavelength band and the second wavelength band are bands in which the wavelengths do not overlap each other. For example, these wavelength bands are C band, L band, S band, etc. used in WDM.

  By combining the wavelength band combinations of the optical transmission signals 23_1a, 23_2a, 23_1b, and 23_2b used in communication between the optical transmission devices 1a and 1b and the optical reception devices 2a and 2b as described above, the optical transmission device 1a, It can suppress that the wavelength band of the subcarrier used in communication with 1b and optical receiver 2a, 2b overlaps.

  In the optical communication system according to the present embodiment, the communication settings of the optical transmission devices 1a and 1b and the optical reception devices 2a and 2b are set between the optical transmission devices 1a and 1b and the optical reception devices 2a and 2b. It may be determined according to at least one of the distance, the communication time zone, and the state of the transmission path between the optical transmitters 1a and 1b and the optical receivers 2a and 2b. In addition, the optical transmission device 1a, at least one of the subcarrier wavelength band allocation, the optical signal path, and the modulation method in the communication between the optical transmission devices 1a and 1b and the optical reception devices 2a and 2b, Communication may be set between 1b and the optical receivers 2a and 2b.

  The invention according to the present embodiment described above can provide an optical communication system and an optical communication system control method capable of efficiently allocating resources in an optical communication network.

<Embodiment 15>
Next, an embodiment 15 of the invention will be described. FIG. 27 is a block diagram showing an optical communication system according to the present embodiment. As shown in FIG. 27, the optical communication system according to the present embodiment includes optical communication devices 3a to 3d. Here, the optical communication devices 3a to 3d are optical communication devices capable of transmitting and receiving.

  The optical communication device 3a includes a subcarrier transmission / reception unit 91a, an optical transmission / reception signal switching unit 92a, and transmission / reception ports 93_1a and 93_2a. The optical communication device 3b includes a subcarrier transmission / reception unit 91b, an optical transmission / reception signal switching unit 92b, and transmission / reception ports 93_1b and 93_2b. The optical communication device 3c includes a subcarrier transmission / reception unit 91c, an optical transmission / reception signal switching unit 92c, and transmission / reception ports 93_1c and 93_2c. The optical communication device 3d includes a subcarrier transmission / reception unit 91d, an optical transmission / reception signal switching unit 92d, and transmission / reception ports 93_1d and 93_2d. As the optical communication devices 3a to 3d, the optical communication device 3 described in the ninth embodiment (see FIG. 20) can be used. See FIG. 5 (Embodiment 2) and FIG. 15 (Embodiment 6) for a more detailed configuration.

  Here, the subcarrier transmission / reception unit 91a of the optical communication device 3a includes the subcarrier transmission units 11_1 to 11_m in FIG. 5 and the subcarrier reception units 43_1 to 43_m in FIG. 15, and the optical transmission / reception signal switching unit 92a is the output in FIG. 15 and the switching unit 42 of FIG. 15, the transmission / reception ports 93_1a and 93_2a correspond to the transmission ports 13_1 and 13_2 of FIG. 5 and the reception ports 41_1 and 41_2 of FIG. The same applies to the other optical communication devices 3b to 3d.

  As shown in FIG. 27, the transmission / reception port 93_1a of the optical communication device 3a is connected to the transmission / reception port 93_1c of the optical communication device 3c. The transmission / reception port 93_2a of the optical communication device 3a is connected to the transmission / reception port 93_1d of the optical communication device 3d. The transmission / reception port 93_1b of the optical communication device 3b is connected to the transmission / reception port 93_2c of the optical communication device 3c. The transmission / reception port 93_2b of the optical communication device 3b is connected to the transmission / reception port 93_2d of the optical communication device 3d.

  At this time, the optical communication device 3a and the optical communication device 3c perform communication using the optical signal 25_1 generated using a plurality of subcarriers in the first wavelength band. Further, the optical communication device 3a and the optical communication device 3d perform communication using an optical signal 25_2 generated using a plurality of subcarriers in the second wavelength band. In addition, the optical communication device 3b and the optical communication device 3c perform communication using the optical signal 25_3 generated using a plurality of subcarriers in the second wavelength band. In addition, the optical communication device 3b and the optical communication device 3d perform communication using the optical signal 25_4 generated using a plurality of subcarriers in the first wavelength band. Here, the first wavelength band and the second wavelength band are bands in which the wavelengths do not overlap each other. For example, these wavelength bands are C band, L band, S band, etc. used in WDM.

  Subcarriers used in communication between the optical communication devices 3a to 3d by making the combinations of the wavelength bands of the optical signals 25_1 to 25_4 used in the communication between the optical communication devices 3a to 3d as described above. Can be prevented from overlapping.

  In the optical communication system according to the present embodiment, the communication setting between the optical communication devices 3a to 3d is performed by the distance and communication between the optical communication devices 3a and 3b and the optical communication devices 3c and 3d. You may determine according to at least 1 of the time slot | zone and the state of the transmission path between optical communication apparatus 3a, 3b and optical communication apparatus 3c, 3d. In addition, the optical communication device 3a, the optical communication device 3a, using at least one of the subcarrier wavelength band allocation, the optical signal path, and the modulation method in the communication between the optical communication devices 3a and 3b and the optical communication devices 3c and 3d. Communication may be set between 3b and the optical communication devices 3c and 3d.

  The invention according to the present embodiment described above can provide an optical communication system and an optical communication system control method capable of efficiently allocating resources in an optical communication network.

  In the above-described embodiments, the present invention has been described as a hardware configuration, but the present invention is not limited to this. The present invention can also realize arbitrary processing by causing a CPU (Central Processing Unit) to execute a computer program.

  The program may be stored using various types of non-transitory computer readable media and supplied to a computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W and semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)) are included. The program may also be supplied to the computer by various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

  Although the present invention has been described with reference to the exemplary embodiments, the present invention is not limited to the above. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the invention.

1, 1_1 to 1_6 Optical transmission device 2, 2_1 to 2_6 Optical reception device 3 Optical communication device 11, 11_1 to 11_m Subcarrier transmission unit 12 Optical transmission signal switching unit 13 Transmission port 14 Light source 15 Subcarrier generation unit 16 Signal conversion unit 21_1 ~ 21_m Optical transmission signal 22_1, 22_2 Optical transmission signal 23_1, 23_2 Optical transmission signal 26_1 First path 26_2 Second path 30 Switching unit 31_1, 31_2 Optical multiplexer 32 Optical multiplexer 33 Optical demultiplexer 41_1, 41_2 Reception port 42 switching units 43_1 to 43_m subcarrier reception units 44_1 and 44_2 local oscillator 45 signal processing units 51_1 and 51_2 optical reception signals 52_1 to 52_m subcarrier reception signals 53_1 to 53_6 reception signals 60_1 and 60_2 optical branching unit 61 optical switching switch 62 optical multiplexing 63 Optical demultiplexer 64 Multiplexed optical signal 80 Controller 8 The monitoring unit 82 setting unit

Claims (15)

A first transmitter for generating and transmitting a first optical transmission signal corresponding to the first subcarrier;
A second transmitter for generating and transmitting a second optical transmission signal corresponding to the second subcarrier;
Before SL first optical transmission signal and the second case to send the first transmission data by an optical transmission signal, and multiplexes the first optical transmission signal and said second optical transmission signal 1 Output to one path, when transmitting the first transmission data by the first optical transmission signal and transmitting second transmission data by the second optical transmission signal, the first optical transmission signal and And an output unit that outputs the second optical transmission signal to different paths.   A signal conversion unit capable of converting the first data signal and the second data signal into an electric signal and outputting the electric signal;
  When transmitting the first transmission data by the first optical transmission signal and the second optical transmission signal, the signal conversion unit converts an electric signal obtained by converting the first data signal into the first transmission unit. And output to the second transmitter,
  When transmitting the first transmission data by the first optical transmission signal and transmitting the second transmission data by the second optical transmission signal, the signal conversion unit converts the first data signal. The output electrical signal is output to the first transmission unit, and the electrical signal obtained by converting the second data signal is output to the second transmission unit.
  The optical transmission device according to claim 1. The output section have at least two output ports, in case of outputting a plurality of optical transmission signals in different paths, optical transmission signal output to the different paths, according to claim 1 or 2 is output from different ports An optical transmitter according to claim 1. The first wavelength corresponding to the first subcarrier and the second wavelength corresponding to the second subcarrier are assigned to a band of one channel of wavelength division multiplexing optical communication. The optical transmission device according to claim 1 or 2 . The optical transmission device according to claim 1 or 2 , wherein predetermined parameters of the first subcarrier and the second subcarrier are assigned so as not to overlap each other. The predetermined parameter is a plurality of parameters, and the first subcarrier and the second subcarrier are arranged so as not to overlap each other on a matrix having the plurality of parameters as axes. 5. The optical transmission device according to 5 . Wherein the predetermined parameter is a wavelength, polarization, at least one of a time, optical transmission apparatus according to claim 5 or 6. Said first and second transmission unit uses the light supplied from the light source, generating the first and second optical transmission signal with different wavelengths from each other, any one of claims 1 to 7 An optical transmitter according to claim 1. The first transmitter is supplied with the first subcarrier from a first light source,
The optical transmission device according to claim 8 , wherein the second transmission unit is supplied with the second subcarrier from a second light source. A first light source and light generated by the single light source are used to generate the first and second subcarriers, and the generated first and second subcarriers are respectively converted into the first and second subcarriers. The optical transmission device according to claim 8 , further comprising: a subcarrier generation unit that supplies the transmission unit. The subcarrier generation unit generates the first and second subcarriers orthogonal to each other by modulating light generated by the single light source using an orthogonal frequency division multiplexing method. 10. The optical transmission device according to 10 . The output unit includes a switching unit that switches an output destination of the first and second optical transmission signals output from the first and second transmission units;
A first and second optical multiplexer provided to correspond to the first and second paths, and configured to multiplex the first and second optical transmission signals output from the switching unit. Item 12. The optical transmission device according to any one of Items 1 to 11 . Generating a first optical transmission signal corresponding to the first subcarrier and transmitting the first optical transmission signal from the first transmission unit;
Generating a second optical transmission signal corresponding to the second subcarrier and transmitting the second optical transmission signal from the second transmission unit,
Before SL first optical transmission signal and the second case to send the first transmission data by an optical transmission signal, and multiplexes the first optical transmission signal and said second optical transmission signal 1 Output to one path,
When transmitting the first transmission data by the first optical transmission signal and transmitting the second transmission data by the second optical transmission signal, the first optical transmission signal and the second optical transmission are transmitted. An optical transmission method that outputs signals to different paths.   Further comprising converting the first data signal and the second data signal into an electrical signal and outputting the electrical signal,
  When transmitting the first transmission data using the first optical transmission signal and the second optical transmission signal, an electrical signal obtained by converting the first data signal is transmitted to the first transmission unit and the second transmission signal. Output to the transmitter,
  When transmitting the first transmission data by the first optical transmission signal and transmitting the second transmission data by the second optical transmission signal, the electrical signal obtained by converting the first data signal is Output to the first transmitter, and output an electrical signal obtained by converting the second data signal to the second transmitter
  The optical transmission method according to claim 13. The first wavelength corresponding to the first subcarrier and the second wavelength corresponding to the second subcarrier are assigned to a band of one channel of wavelength division multiplexing optical communication. The optical transmission method according to claim 13 or 14 .

Images