JP6908076B2 - Optical transmitters, optical receivers, optical communication devices, optical communication systems, and their control methods - Google Patents

Description

The present invention relates to an optical transmitter, an optical receiver, an optical communication device, an optical communication system, and a control method thereof.

With the explosive increase in demand for broadband multimedia communication services such as the Internet and video distribution, the introduction of longer-distance, large-capacity, and highly reliable high-density wavelength division multiplexing optical fiber communication systems is progressing in trunk lines and metro systems. In addition, optical fiber access services are rapidly becoming widespread in subscriber systems as well. In a communication system using such an optical fiber, it is important to reduce the installation cost of the optical fiber which is an optical transmission line and to improve the transmission band utilization efficiency per optical fiber. For this reason, wavelength division multiplexing (WDM), which multiplexes and transmits a plurality of optical signals having different wavelengths, is widely used. In WDM technology, one wavelength was used for one channel. On the other hand, recently, superchannel technology capable of realizing a transmission capacity exceeding 100 Gbps per band of WDM1 channel has attracted attention. Since this super channel technology uses a plurality of wavelengths (subcarriers) for one channel band, the wavelengths can be multiplexed at high density. Therefore, in the future, this super channel technology will become important in increasing the transmission capacity to 400 Gbps and 1 Tbps.

Patent Document 1 and Patent Document 2 disclose a technique related to optical communication using WDM. Patent Document 1 discloses a technique relating to an optical network device capable of efficiently operating, managing and maintaining a network. Patent Document 2 discloses a technique relating to an optical transmission device capable of reducing the influence of mutual mixing noise when transmitting an electric signal including a plurality of subcarriers by analog optical modulation.

Japanese Unexamined Patent Publication No. 2003-008513 Japanese Unexamined Patent Publication No. 2008-206063

In a communication network, the traffic between predetermined nodes is slow or slow. Therefore, transmission between predetermined nodes does not always have to be performed at the maximum transmission capacity. On the other hand, as described in the background technology, in optical communication using WDM technology, one wavelength is used for one channel. For this reason, in an optical communication device using WDM technology, there is only one option of turning off communication or performing communication at 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. Based on this point, the inventor uses some of the multiple wavelengths in the band of one channel for the transmission device to set the transmission capacity to an intermediate value, and then uses the remaining wavelengths to use the other wavelengths. We have 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 capable of efficiently allocating resources in an optical communication network.

The optical transmission device 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 above. 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 second optical transmission signal are output. When the second optical transmission signal does not share the series of information, it includes an output unit that outputs either one of the first optical transmission signal and the second optical transmission signal to the second path.

The optical receiving device according to the present invention uses the first and second receiving units for receiving the subcarrier receiving signal, and the input first and second subcarrier receiving signals and the second subcarrier receiving signal as the first and second receiving signals. The switching unit includes a switching unit that outputs to the receiving unit of 2, and the switching unit includes the first and second subcarrier receiving signals when the first and second subcarrier receiving signals share a series of information. Is received via the same route, and the first subcarrier reception signal is output to the first receiving unit and the second subcarrier receiving signal is output to the second receiving unit. When the subcarrier reception signal 1 and the second subcarrier reception signal do not share the series of information, the first and second subcarrier reception signals are received via different routes and the first subcarrier reception signal is received. The subcarrier reception signal of 1 is output to the first receiving unit, and the second subcarrier receiving signal is output to the second receiving unit.

The optical communication device 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 above. 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 second optical transmission signal are output. When the second optical transmission signal does not share the series of information, an output unit that outputs either the first optical transmission signal or the second optical transmission signal to the second path, and subcarrier reception. The first and second receiving units that receive the signals, and the switching unit that outputs the input first subcarrier receiving signal and the second subcarrier receiving signal to the first and second receiving units. When the first subcarrier reception signal and the second subcarrier reception signal share a series of information, the switching unit transmits the first subcarrier reception signal to the first reception unit. When the second subcarrier reception signal is output to the second receiving unit, respectively, and the first subcarrier reception signal and the second subcarrier reception signal do not share the series of information, the first subcarrier reception signal is described. The subcarrier reception signal is output to the receiving unit of 2.

The 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, and 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, 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 receiver and the first optical transmission signal and the second optical transmission signal do not share the series of information. It includes an output unit that outputs either one of the first optical transmission signal and the second optical transmission signal to the second optical receiving device.

The optical communication system according to the present invention includes an optical transmission device that transmits the first and second optical transmission signals, a first and second optical reception devices that receive the first and second optical transmission signals, and the like. A controller for controlling the optical transmission device is provided, 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. The second optical transmission signal is output to the first optical receiving device, and the second optical transmitting signal that does not share a series of information with the first optical transmitting signal is output to the second optical receiving device.

The 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, and the optical reception device receives first and second subcarrier reception signals. The switching unit includes a second receiving unit and a switching unit that outputs the input first subcarrier receiving signal and the second subcarrier receiving 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. Is output to the first receiving unit, the second subcarrier receiving signal is output to the second receiving unit, and the first subcarrier receiving signal and the second subcarrier receiving signal are the series of information. When the above is not shared, the first and second subcarrier reception signals are received from different optical transmission devices, the first subcarrier reception signal is output to the first receiving unit, and the second subcarrier reception signal is output. The subcarrier reception signal is output to the second receiving unit.

The controller according to the present invention is an optical communication system including an optical transmitter and first and second optical receivers, the first optical transmission signal and the first optical transmission to the optical transmitter. The first optical receiver outputs a second optical transmission signal that shares a series of information with the signal, and the second optical transmission signal that does not share a series of information with the first optical transmission signal is the second. Output to the optical receiver of.

The control method of the optical communication system according to the present invention is a control method of an optical communication system including an optical transmission device and first and second optical reception devices, and the optical transmission device is the first optical. The first transmission unit that transmits a transmission signal, the 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. In this case, 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 are in the series. When the information is not shared, the communication state of the optical communication system includes an output unit that outputs either one of the first optical transmission signal and the second optical transmission signal to the second optical receiving device. The optical transmitter and the first and second optical receivers are controlled according to the above.

The 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, and 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, the first optical transmission signal, and the second optical transmission signal share a series of information, the first transmission unit Both the 1 optical transmission signal and the 2nd optical transmission signal are output to the 1st optical receiver, and the 1st optical transmission signal and the 2nd optical transmission signal do not share the series of information. In this case, the first optical transmission signal and an output unit that outputs either one of the second optical transmission signals to the second optical receiving device are provided, and the above is provided according to the communication state of the optical communication system. This is a program for causing a computer to execute a process of controlling the optical transmitter and the first and second optical receivers, respectively.

In the optical transmission method according to the present invention, a first optical transmission signal is generated, a second optical transmission signal is generated, and the first optical transmission signal and the second optical transmission signal share a series of information. In this case, 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 second optical transmission signal transmit the series of information. When not shared, either one of the first optical transmission signal and the second optical transmission signal is output to the second path.

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

INDUSTRIAL APPLICABILITY 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 efficiently allocate resources in an optical communication network.

It is a block diagram which shows the optical transmission device which concerns on Embodiment 1. FIG. It is a figure which shows the optical communication system which concerns on a comparative example. It is a figure which shows the optical communication system which concerns on a comparative example. It is a figure for demonstrating the effect of this invention. It is a block diagram which shows the optical transmission device which concerns on Embodiment 2. FIG. It is a figure for demonstrating the arrangement of a subcarrier. It is a figure for demonstrating the arrangement of a subcarrier. It is a block diagram which shows the optical transmission device which concerns on Embodiment 3. It is a figure which shows an example of the subcarrier (WDM). It is a figure which shows another example of a subcarrier (OFDM modulation). It is a block diagram which shows the optical transmission device which concerns on Embodiment 4. FIG. It is a block diagram which shows the optical transmission device which concerns on Embodiment 4. FIG. It is a block diagram which shows the optical transmission device which concerns on Embodiment 4. FIG. It is a block diagram which shows the optical receiving apparatus which concerns on Embodiment 5. It is a block diagram which shows the optical receiving apparatus which concerns on Embodiment 6. It is a block diagram which shows the optical receiving apparatus which concerns on Embodiment 7. It is a block diagram which shows the optical receiving apparatus which concerns on Embodiment 8. It is a block diagram which shows the optical receiving apparatus which concerns on Embodiment 8. It is a block diagram which shows the optical receiving apparatus which concerns on Embodiment 8. It is a block diagram which shows the optical communication apparatus which concerns on Embodiment 9. It is a block diagram which shows the optical communication system which concerns on Embodiment 10. It is a block diagram which shows the optical communication system which concerns on Embodiment 11. FIG. 5 is a block diagram showing a controller included in the optical communication system according to the eleventh embodiment. It is a block diagram which shows the controller included in the optical communication system which concerns on Embodiment 12. It is a block diagram which shows the optical communication system which concerns on Embodiment 13. It is a block diagram which shows the optical communication system which concerns on Embodiment 14. It is a block diagram which shows the optical communication system which concerns on Embodiment 15.

<Embodiment 1>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an optical transmission device 1-1 according to the first embodiment. As shown 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. In the following, the first and second transmission units may be referred to as subcarrier transmission units.

The first transmission unit 11_1 transmits the first optical transmission signal 21_1. The second transmission unit 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 are the first transmission units for transmitting the transmission data. The optical transmission signal 21_1 and the second optical transmission signal 21_2 are generated, respectively. The first optical transmission signal 21_1 and the second optical transmission signal 21_2 are signals for transmitting transmission data using a subcarrier.

The optical transmission device 1-1 according to the present embodiment uses WDM technology for multiplexing and transmitting 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 device according to the present embodiment, a super channel technique for allocating a plurality of wavelengths (subcarriers) to one channel band of WDM can be used. By using this super channel technology, wavelengths can be multiplexed at 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 routes both the first optical transmission signal 21_1 and the second optical transmission signal 21_2 in the same path. (For example, the first path 26_1) is output.

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 receives either one of the first optical transmission signal 21_1 and 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 and second. 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 transmits 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 share 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 signals. 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 uses the first optical transmission signal 21_1 to transmit predetermined first transmission data, and the second transmission unit 11_1 uses the second optical transmission signal 21_1 to transmit predetermined first transmission data. This is the case of transmitting the transmission data of 2. In this case, since the first optical transmission signal 21_1 and the second optical transmission signal 21_2 contain independent transmission data, the first optical transmission signal 21_1 and the second optical transmission signal 21_2 are separated from each other. It can be output to the route (first route 26_1, second route 26_2).

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

As described above, in the optical transmission device 1_1 according to the present embodiment, the output destinations of the first optical transmission signal 21_1 and the second optical transmission signal 21_2 are switched by using the output unit 12. Therefore, it is possible to provide an optical transmission device capable of efficiently allocating resources. The reason for this will be explained 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 the super channel technology. The optical communication system shown in FIGS. 2 and 3 includes optical communication devices 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 capable of transmission / reception using different wavelengths (subcarriers). That is, the optical communication device 101_a can allocate a plurality of wavelengths (subcarriers) to the band of one channel of WDM. Each transmission / reception unit 102_a is configured to be capable of transmission / reception using each subcarrier. The same applies to the optical communication device 101_b and the optical communication device 101_c.

In the optical communication system shown in FIGS. 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 connected by an optical fiber. 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 at the maximum transmission capacity (100%). It shows the case of doing.

In a communication network, the traffic between predetermined nodes is slow or slow. Therefore, the transmission between the optical communication device 101_a and the optical communication device 101_b does not always have to be performed at the maximum transmission capacity. As described in the background technology, in optical communication using WDM technology, one wavelength is used for one channel. For this reason, in an optical communication device using WDM technology, there is only one option of turning off communication or performing communication at 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. Therefore, for example, as shown in FIG. 3, the transmission capacity between the optical communication device 101_a and the optical communication device 101_b can be set to 50% of the maximum transmission capacity. However, in this case, the unused transmission / reception unit 108_a of the transmission / reception unit 102_a of the optical communication device 101_a is generated. Further, among the transmission / reception units 102_b of the optical communication device 101_b, an unused transmission / reception unit 108_b is generated.

When the super channel technology is used, the signals transmitted and received by each transmission / reception unit 102_a share a series of information. In other words, each transmission / reception unit 102_a transmits / receives data in parallel. Therefore, the optical communication device 101_a is configured to transmit and receive optical signals via a single port 103_a. Therefore, even if an unused transmission / reception unit 108_a occurs among the transmission / reception units 102_a of the optical communication device 101_a, the unused transmission / reception unit 108_a cannot be used for communication with another optical communication device 101_c, which is a resource. Was wasted.

FIG. 4 is a diagram for explaining the effect of the present invention. Although the effect of the present invention will be described with reference to FIG. 4 using an optical communication device (optical communication device capable of transmitting and receiving), the effect of the present invention can be similarly obtained in an optical transmission device and an optical reception device. ..

The optical communication system shown 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 capable of transmission / reception using different subcarriers. That is, the optical communication device 110_a can allocate a plurality of wavelengths (subcarriers) in the band of one channel of WDM. 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 a plurality of transmission / reception ports 113_1a and 113_2a, and each transmission / reception unit 111_a connected to the plurality of transmission / reception ports 113_1a and 113_2a can be switched by using the switching unit 112_a. Therefore, even when an unused transmission / reception unit is generated in 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 another optical communication device.

For example, in the optical communication system shown in FIG. 3, when the transmission capacity between the optical communication device 101_a and the optical communication device 101_b is set to 50% of the maximum transmission capacity, the transmission / reception unit 102_a of the optical communication device 101_a Of these, an unused transmission / reception unit 108_a was generated, wasting resources. 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 by using the switching unit 112_a. The unused transmission / reception unit can be allocated to the communication with the optical communication device 110_c. Therefore, efficient resource allocation can be performed in the optical communication network.

At this time, the optical communication device 110_a and the optical communication device 110_b communicate 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 with each other 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.

Note that FIG. 4 shows an example in which the transmission capacity between the respective optical communication devices 110_a to 110_c is 50% of the maximum transmission capacity, but the transmission capacity between the respective optical communication devices 110_a to 110_c is shown as an example. It can be flexibly set by changing the number of each transmission / reception unit connected to each transmission / reception port by using each switching unit 112_a to 112_c.

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

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described. In the second embodiment, the detailed configuration of the optical transmitter 1-1-1 described in the first embodiment will be described. FIG. 5 is a block diagram showing an optical transmission device 1-2 according to the second embodiment. As shown 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 of 2 or more and corresponds to the number of subcarrier transmitters. The optical transmission signals 21_1 to 21_m are signals for transmitting transmission data using a subcarrier. For example, the subcarrier transmission unit 11_1 generates an optical transmission signal 21_1 by using the subcarrier SC1 corresponding to the subcarrier transmission unit 11_1. Further, the subcarrier transmission unit 11_2 generates an optical transmission signal 21_2 by using the subcarrier SC2 corresponding to the subcarrier transmission unit 11_2. As described above, each subcarrier transmitting unit 11_1 to 11_m generates each optical transmission signal 21_1 to 21_m by using each subcarrier SC1 to SCm corresponding to each subcarrier transmitting unit 11_1 to 11_m.

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

6 and 7 are diagrams for explaining the arrangement of the subcarriers. FIG. 6 shows an example of the arrangement of subcarriers when wavelength and time are used as predetermined parameters. In the case shown in FIG. 6, when the subcarriers SC1 to SC4 are arranged on the matrix (in this case, on the XY plane) with the wavelength as the X axis and the time as the Y axis, the respective subcarriers SC1 to The SC4s are arranged so that they do not overlap each other on the matrix plane. In the example shown in FIG. 6, the wavelengths of the respective subcarriers SC1 to SC4 are set to λ1 to λ4, respectively, and the respective subcarriers SC1 to SC4 are time-divisioned by time t1 to t4. That is, the subcarrier SC1 is set using the parameters (λ1, t1), the subcarrier SC2 is set using the parameters (λ2, t2), the subcarrier SC3 is set using the parameters (λ3, t3), and the subcarrier SC4 is set using the parameters (λ4, t4). be able to.

Further, FIG. 7 shows an example of the arrangement of subcarriers when wavelength and polarization are used as predetermined parameters. In the case shown in FIG. 7, when the subcarriers SC1 to SC4 are arranged on the matrix having the wavelength as the X axis and the polarization as the Y axis (in this case, on the XY plane), each subcarrier SC1 ~ 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 respective subcarriers SC1 to SC4 are set to λ1 to λ4, respectively, and the polarizations of the respective 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) can be used for setting.

In this way, by assigning the parameters of the respective optical transmission signals 21_1 to 21_m so as not to overlap each other, the influence of mutual interference between the subcarriers can be reduced. Although each subcarrier is set using two parameters in FIGS. 6 and 7, each subcarrier may be set using three or more parameters in the present embodiment. ..

When wavelength is included as the above parameter, the plurality of subcarrier transmitters 11_1 to 11_m each use a light source for generating each of the subcarriers SC1 to SCm (a light source that outputs light of a single wavelength, not shown). You may have it. 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 method. Examples of the modulation method include amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK), quadrature amplitude modulation (QAM), and four phase shift keying (QPSK). .. As the quadrature amplitude modulation (QAM), for example, 16QAM, 64QAM, 128QAM, 256QAM and the like can be used.

The output unit 12 selectively outputs the respective 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_1) 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 the 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_1 to the transmission port 13_1, the optical transmission signal 22_1 in which the optical transmission signals 21_1 to 21_1 are multiplexed is supplied to the transmission port 13_1. Similarly, the output unit 12 outputs an optical transmission signal 22_2 in which a plurality of optical transmission signals are multiplexed 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 in which the optical transmission signals 21_6 to 21_10 are multiplexed 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 respective transmission ports 13_1 and 13_2. For example, the output unit 12 is controlled by using a control means (not shown).

The plurality of transmission ports 13_1 and 13_2 are configured to be capable of transmitting optical transmission signals 22_1 and 22_2 output from the output unit 12 (in other words, 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) to which the connection is made. Further, the transmission port 13_2 outputs an optical transmission signal 23_2 (same as the optical transmission signal 22_2) to a second optical receiver (not shown) to which the connection is made.

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 optical transmission signal 21_1 to 21_m output from the plurality of subcarrier transmission units 11_1 to 11_m to three or more transmission ports. can do.

As described above, in the optical transmission device according to the present embodiment, as shown in FIG. 5, a plurality of transmission ports 13_1 and 13_2 and an output unit 12 are provided, and the output unit 12 is used to provide a plurality of subcarrier transmission units 11_1. The respective 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 while transmitting data to the first optical receiver (not shown) via the transmission port 13_1, an unused subcarrier transmission is performed. Data can be transmitted to a second optical receiver (not shown) via the transmission port 13_2 using the unit 11_m.

Further, by using the output unit 12 to dynamically switch the optical transmission signals 21_1 to 21_m supplied to the respective transmission ports 13_1 and 13_2, the transmission capacity in the communication via the transmission port 13_1 and the transmission port 13_2 can be obtained. The transmission capacity in communication via communication can be dynamically adjusted.

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

<Embodiment 3>
Next, Embodiment 3 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, it is the same as the optical transmission device 1-2 described in the second embodiment. Therefore, the same components are designated by the same reference numerals, and duplicated description will be omitted.

As shown 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 conversion unit 16.

The light source 14 is a light source that outputs a single carrier C1 (light of a single wavelength), and can be configured by 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 each of the generated subcarriers SC1 to SCm is used as a subcarrier transmission unit 11'_1 to 1. Supply to 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 by 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 by using the orthogonal frequency division multiplexing method (OFDM). good. Further, the subcarrier generation unit 15 may generate a plurality of subcarriers SC1 to SCm by 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 the frequency utilization efficiency in communication using the super channel technology. Can be enhanced.

For example, when subcarriers are generated using each light source provided in each subcarrier transmission unit 11_1 to 11_m (see the second embodiment), as shown in FIG. 9, the interval between the subcarriers SC1 to SC4 is provided. 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 are as shown in FIG. Is narrower than that shown in FIG. 9, and the frequency utilization efficiency can be improved.

At this time, it is preferable that the intervals between the subcarriers SC1 to SCm are constant. That is, when the wavelength interval of each subcarrier SC1 to SCm fluctuates, it is necessary to consider the fluctuation of the wavelength of each subcarrier 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 each subcarrier SC1 to SCm can be made constant.

The signal conversion unit 16 converts the input transmission data DS1 and DS2 in series-parallel conversion, and outputs the series-parallel converted data DP1 to DPm 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 data DP2 using the subcarrier SC2. In this way, the subcarrier transmission unit 11'_m generates an optical transmission signal 21_m for transmitting 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 are the respective subcarriers SC1 to 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, among the plurality of subcarrier transmission units 11'_1 to 11'_m, each subcarrier transmission unit that transmits the optical transmission signal 22_1 via the transmission port 13_1 can transmit the first data in parallel. .. Further, among the plurality of subcarrier transmission units 11'_1 to 11'_m, each subcarrier transmission unit that transmits the optical transmission signal 22_2 via the transmission port 13_2 can transmit the second 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' It is assumed that _1 to 11'_6 transmit the first data DS1 via the transmission port 13_1. Further, 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 converts the input first data DS1 in series-parallel conversion, and outputs the series-parallel converted first data DP1 to DP6 to the subcarrier transmission units 11'_1 to 11'_6, respectively. 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 by 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. As a result, 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 converted in series-parallel conversion in parallel via the transmission port 13_1. At this time, the data width of the transmission data transmitted via 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 converts the input second data DS2 in series-parallel conversion, and outputs the series-parallel converted second data DP7 to DP10 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 by 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. As a result, 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, which has been converted in series and parallel, in parallel via the transmission port 13_2. At this time, the data width of the transmission data transmitted via the transmission port 13_2 corresponds to the number of subcarrier transmission units 11'_7 to 11'_10 (that is, data DP7 to DP10) connected to the transmission port 13_2. 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 output from the plurality of subcarrier transmission units 11'_1 to 11'_m, respectively. The output destination of the optical transmission signals 21_1 to 21_m can be adjusted by changing the output destination 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 efficiently allocating resources in an optical communication network.

<Embodiment 4>
Next, Embodiment 4 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 shown. Other than this, it is the same as the optical transmitters 1-1 to 1_3 described in the first to third embodiments. Therefore, the same components are designated by the same reference numerals, and duplicated description will be omitted.

As shown in FIG. 11, the output unit 12_1 included in the optical transmission device 1_1 according to the present embodiment includes a switching unit 30 and optical combiners 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 respective subcarrier transmission units 11_1 to 11_m to either the optical combiner 31_1 or the optical combiner 31_2. The switching unit 30 can be configured by using, for example, an optical matrix switch having m input and m × 2 output. Here, the m input of the switching unit 30 corresponds to the number of each optical transmission signal 21_1 to 21_m. For example, the switching unit 30 is controlled by using a control means (not shown).

The plurality of optical combiners 31_1 and 31_2 are provided so as to correspond to the respective transmission ports 13_1 and 13_2, and combine the respective optical transmission signals 21_1 to 21_m output from the switching unit 30. That is, the optical combiner 31_1 combines and multiplexes each optical transmission signal output from the switching unit 30, and outputs the multiplexed optical transmission signal 22_1 to the transmission port 13_1. Similarly, the optical combiner 31_2 combines and multiplexes each optical transmission signal 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_1 according to the present embodiment, the output unit 12_1 is configured by using the switching unit 30 and the optical combiners 31_1 and 31_2. Therefore, the optical transmission signals 21_1 to 21_m supplied to the respective transmission ports 13_1 and 13_2 can be dynamically switched.

The switching unit 30 may be configured by using a plurality of optical switches SW_1 to SW_m as in the output unit 12_2 included in the optical transmission device 1_5 shown 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 the outputs of the optical transmission signals 21_1 to 21_m output from the respective subcarrier transmission units 11_1 to 11_m are provided. The destination is switched to the optical combiner 31_1 or the optical combiner 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 transmitted to either the optical combiner 31_1 or the optical combiner 31_1. Output. The optical switch SW_2 is provided so as 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 combiner 31_1 or the optical combiner 31_2. do. Each of the optical switches SW_1 to SW_m is controlled by using a control means (not shown).

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

For example, the optical duplexer 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 the respective 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 showing the optical receiver 2_1 according to the fifth embodiment. As shown in FIG. 14, the optical receiving device 2_1 according to the present embodiment includes a switching unit 42, a first receiving unit 43_1, and a second receiving unit 43_1. In the following, 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 contained therein to the first reception unit 43_1 and the second reception unit 43_2. do. In other words, the switching unit 42 can arbitrarily and dynamically switch the output destinations (first and second receiving units 43_1, 43_2) of the subcarrier reception signals included in the optical reception signals 51_1 and 51_2. For example, the switching unit 42 is controlled by using a control means (not shown).

The first receiving unit 43_1 receives the data transmitted using the subcarrier receiving signal 52_1. The second receiving unit 43_2 receives the data transmitted by using the subcarrier receiving signal 52_2. The first receiving unit 43_1 and the second receiving unit 43_2 include a detection unit (not shown) for detecting the subcarrier reception signals 52_1 and 52_2, respectively. Each detector may include a local oscillator.

In the optical receiver 2_1 according to the present embodiment, the switching unit 42 receives a first subcarrier reception signal when the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2 share a series of information. The 52_1 and the second subcarrier reception signal 52_2 are received via the same route. 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_1, so that the switching unit 42 receives the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_1. 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, when the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2 do not share a series of information, the switching unit 42 sets the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2. Is 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 includes the optical reception signal 51_1 and the optical. By receiving the reception signal 51_1, the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_1 can be received via different routes. 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, when the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2 share a series of information, for example, the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_1 This is the case where predetermined data is transmitted in parallel using.

On the other hand, when the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2 do not share a series of information, for example, the first subcarrier reception signal 52_1 and the second subcarrier reception signal 52_2 This is a case where predetermined data is transmitted independently. For example, the first optical transmitter (not shown) transmits the first data using the first subcarrier reception signal 52_1, and the second optical transmitter (not shown) transmits the second data to the second. This is the case of transmission using the subcarrier reception signal 52_2 of the above. 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 receives the second optical transmitter (not shown). 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 receiving signal 52_1 and the second subcarrier receiving signal 52_1 are switched to the first receiving unit 43_1 and the second receiving unit 43_2. The unit 42 is used for selective output.

Therefore, for the same reason as described in the first embodiment, it is possible to provide an optical receiving device and an optical receiving method capable of efficiently allocating resources in an optical communication network.

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

The plurality of receiving ports (PR_1, PR_1) 41_1 and 41_2 receive the multiplexed optical reception signals 50_1 and 50_2 supplied to the optical receiving device 2_2, respectively, and the received optical reception signals 51_1 and 51_2 are switched by the switching unit 42, respectively. Output to. The reception ports 41_1 and 41_2 can receive the optical reception signals 50_1 and 50_2 transmitted from different optical transmission devices, respectively. For example, the reception port 41_1 receives the optical reception signal 50_1 transmitted from the first optical transmission device (not shown), and the reception port 41_2 receives the optical reception signal 50_1 transmitted from the second optical transmission device (not shown). Can be received.

The switching unit 42 converts each subcarrier reception signal 52_1 to 52_m included in the respective 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 1. Selectively output to 43_m. In other words, each of the multiplexed optical reception signals 51_1 and 51_2 is separated into the respective subcarrier reception signals 52_1 to 52_m by the switching unit 42. Then, each of the separated subcarrier reception signals 52_1 to 52_m is a subcarrier reception unit 43_1 to 43_m corresponding to each subcarrier reception signal 52_1 to 52_m (that is, a sub capable of receiving the subcarrier reception signal of each wavelength). It is output to each 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 receiving units 43_1 to 43_m) of the respective subcarrier receiving signals 52_1 to 52_m. For example, the switching unit 42 is controlled by using a control means (not shown).

The subcarrier receiving unit 43_1 receives the data transmitted using the subcarrier receiving signal 52_1. The subcarrier receiving unit 43_2 receives the data transmitted using the subcarrier receiving signal 52_2. In this way, the subcarrier receiving unit 43_m receives each data transmitted using the subcarrier receiving signal 52_m. Each subcarrier receiving unit 43_1 to 43_m includes a detection unit (not shown) for detecting each subcarrier receiving signal 52_1 to 52_m. Each detector may include a local oscillator. That is, each subcarrier receiving unit 43_1 to 43_m interferes with the locally oscillating light generated by each local oscillator and each input subcarrier receiving signal 52_1 to 52_m, so that each subcarrier receiving unit 43_1 to 52_m interferes with each other. The subcarrier reception signals 52_1 to 52_m corresponding to 43_1 to 43_m can be received.

Each subcarrier received signal 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 include a circuit for reading data from the subcarrier receiving signals 52_1 to 52_m modulated by a predetermined modulation method. Examples of the predetermined modulation method include amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK), quadrature amplitude modulation (QAM), and four phase shift keying (QPSK). Can be done. As the quadrature amplitude modulation (QAM), for example, 16QAM, 64QAM, 128QAM, 256QAM and the like can be used.

Further, in the optical receiving device 2_2 according to the present embodiment, each of the subcarrier receiving units 43_1 to 43_m that has received the subcarrier receiving signal (optical receiving 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 converted in series and parallel in parallel. Further, each of the subcarrier receiving units 43_1 to 43_m that have received the subcarrier receiving signal (optical reception signal 50_2) via the second receiving port 41-2 of the plurality of subcarrier receiving units 43_1 to 43_m is a second unit that has undergone series-parallel conversion. Data 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. Further, 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 receiving device 2_2 includes subcarrier receiving units 43_1 to 43_10, and among these subcarrier receiving units 43_1 to 43_10, the subcarrier receiving units 43_1 to 43_6 receive the first data. It shall be received via port 41-1. Further, it is assumed that the subcarrier receiving units 43_7 to 43_10 receive the second data via the receiving port 41-2.

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

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

For example, each subcarrier receiving unit 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 an electric signal, and outputs the electric signal as a reception signal 53_1 to 53_m to the signal processing unit 45. For the photoelectric converter, for example, a photodiode can be used.

The signal processing unit 45 performs predetermined processing on the received signals 53_1 to 53_m output from the subcarrier receiving 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 respective subcarrier reception signals 52_1 to 52_m. That is, by simultaneously processing each of the subcarrier receiving units 43_1 to 43_m in the signal processing unit 45, for example, compensation for crosstalk and non-linear optical effects (mutual phase modulation (XPM), four-wave mixing (FWM), etc.) are compensated. It can be performed. For example, the signal processing unit 45 controls each local oscillator included in each subcarrier receiving unit 43_1 to 43_m according to each subcarrier receiving signal 52_1 to 52_m, so that each subcarrier receiving signal 52_1 to 52_m The effects of mutual interference between them may be compensated.

In the super channel technology, a plurality of wavelengths (subcarriers) are used in a band of one channel, and the wavelengths are multiplexed at high density. Therefore, the influence of mutual interference between subcarriers is large. In the optical receiver according to the present embodiment, a plurality of different subcarriers are received by the same optical receiver, and adjacent subcarriers affecting one subcarrier can be monitored at the same time. Therefore, compensation parameters for compensating for the influence of mutual interference between subcarrier reception signals can be set.

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

Similar to the case described in the first embodiment, when the optical receiving device has only one receiving port, the following problems occur. That is, if an unused subcarrier receiver occurs while the optical receiver is receiving data from the first optical transmitter (not shown) via one receiver port, this unused subcarrier receiver is generated. There was a problem that the subcarrier receiver of the above could not be used and resources were wasted. That is, when there is only one receiving port, the unused subcarrier receiver cannot be used to receive data from another optical transmitter, and the unused subcarrier receiver 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 the 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 receiver is generated, an optical reception signal is received from another optical transmitter (not shown) via an available receiving port, and the unused subcarrier receiver receives the optical reception signal. Data can be received using this optical reception signal.

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

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

<Embodiment 7>
Next, Embodiment 7 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). Other than this, it is the same as the optical receiver 2_2 described in the sixth embodiment. Therefore, the same components are designated by the same reference numerals, and duplicated description will be omitted.

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

The switching unit 42 selectively transmits each subcarrier reception signal 52_1 to 52_6 included in the respective 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 subcarrier reception signals 52_1 to 52_6 at the switching unit 42. Then, each of the separated subcarrier reception signals 52_1 to 52_6 is output to the subcarrier reception units 43_1 to 43_6 corresponding to the respective 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 destinations of the respective subcarrier reception signals 52_1 to 52_6. For example, the switching unit 42 is controlled by using a control means (not shown).

The subcarrier receiving units 43_1 to 43_6 receive each data transmitted using the respective subcarrier receiving signals 52_1 to 52_6. Each subcarrier receiving unit 43_1 to 43_6 includes a detection unit (not shown) for detecting each subcarrier receiving signal 52_1 to 52_6. At this time, the detection unit included in each of the subcarrier receiving units 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 each of the subcarrier receiving signals 52_1 to 52_3 by using the locally oscillating light output from the local oscillator 44_1. At this time, the local oscillator 44_1 generates locally oscillating light having a wavelength corresponding to each subcarrier reception signal 52_1 to 52_3 (a wavelength that interferes with each subcarrier reception signal 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 oscillator light output from the local oscillator 44_1 has a single wavelength, each subcarrier reception is received. The signals 52_1 to 52_3 interfere with the locally oscillated light. Therefore, each subcarrier receiving unit 43_1 to 43_3 can detect each subcarrier receiving signal 52_1 to 52_3 by using the local oscillation light output from the local oscillator 44_1.

Similarly, the subcarrier receiving units 43_4 to 43_6 can detect each of the subcarrier receiving signals 52_4 to 52_6 using the locally oscillating light output from the local oscillator 44_2. At this time, the local oscillator 44-22 generates locally oscillating 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 oscillator light output from the local oscillator 44_2 has a single wavelength, each subcarrier reception is received. The signals 52_4 to 52_6 interfere with the locally oscillated light. Therefore, each of the subcarrier receiving units 43_4 to 43_6 can detect each of the subcarrier receiving signals 52_4 to 52_6 by using the locally oscillating light output from the local oscillator 44_2. For example, the local oscillators 44_1 and 44_2 can be configured by using a laser diode.

For example, each subcarrier receiving unit 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 an electric signal, and outputs the electric signal as a reception signal 53_1 to 53_6 to the signal processing unit 45. For the photoelectric converter, for example, a photodiode can be used.

The signal processing unit 45 performs predetermined processing on the received signals 53_1 to 53_6 output from the subcarrier receiving units 43_1 to 43_6 to generate data. Further, the signal processing unit 45 can control the local oscillators 44_1 and 44_2 according to the received signals 53_1 to 53_6 output from the subcarrier receiving 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. May be. 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, they are shared by the subcarrier reception units 43_1 to 43_3. 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.

Further, as in the case of the sixth embodiment, by simultaneously processing a plurality of subcarrier reception signals in the signal processing unit 45, for example, crosstalk compensation, nonlinear optical effect (mutual phase modulation (XPM), four-wave mixing) can be performed. (FWM) etc.) can be compensated.

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

<Embodiment 8>
Next, Embodiment 8 of the present invention will be described. FIG. 17 is a block diagram showing an optical receiver 2_4 according to the present embodiment. The optical receiving device 2_4 according to the present embodiment shows a specific configuration example of the switching unit 42 included in the optical receiving devices 2_1 to 2_3 described in the fifth to seventh embodiments. Other than this, the same as the optical receivers 2-1 to 2_3 described in the fifth to seventh embodiments, the same components are designated by the same reference numerals, and duplicated description will be omitted.

As shown in FIG. 17, the switching unit 42_1 included in the optical receiving device 2_4 according to the present embodiment includes optical turnouts 60_1 and 60_1 and an optical changeover switch 61. The optical turnouts 60_1 and 60_1 are provided so as to correspond to the respective reception ports 41_1 and 41_2, branch the optical reception signals 51_1 and 51_1 received at the respective reception ports 41_1 and 41_2, and output to the optical changeover switch 61. do.

The optical changeover switch 61 inputs optical reception signals branched by the respective optical turnouts 60_1 and 60_2, and selectively outputs these to the respective subcarrier receiving units 43_1 to 43_m. For example, the optical changeover switch 61 can be configured by using an optical matrix switch having m × 2 input and m output. 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 optical changeover switch 61 is controlled by using a control means (not shown).

As described above, in the optical receiver 2_1 according to the present embodiment, the switching unit 42_1 is configured by using the optical turnouts 60_1 and 60_2 and the optical selector 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.

The optical changeover switch 61 may be configured by using a plurality of optical switches SW_1 to SW_m as in the switching unit 42_2 included in the optical receiver 2_5 shown in FIG. In this case, the optical switches SW_1 to SW_m are provided so as to correspond to the respective subcarrier receiving units 43_1 to 43_m, and each subcarrier is received from the optical receiving signals branched by the respective optical turnouts 60_1 and 60_2. The optical reception signal to be output to units 43_1 to 43_m is selected and output.

For example, the optical switch SW_1 is provided so as to correspond to the subcarrier receiving unit 43_1, and among the optical receiving signals branched by the optical turnouts 60_1 and 60_1, the subcarrier receiving signal corresponding to the subcarrier receiving unit 43_1 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 receiving unit 43_2, and among the optical receiving signals branched by the optical turnouts 60_1 and 60_2, the subcarrier receiving signal 52_2 corresponding to the subcarrier receiving unit 43_2 is selected. It is selected, and the selected subcarrier reception signal 52_2 is output to the subcarrier reception unit 43_2. Each of the optical switches SW_1 to SW_m is controlled by using a control means (not shown). For example, the optical switches SW_1 to SW_m can be configured by a wavelength selection type optical switch.

Further, for example, as in the optical receiving device described in the latter half of the sixth embodiment, if each of the subcarrier receiving units 43_1 to 43_m can selectively receive a specific subcarrier receiving signal, one is used. 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 the optical combiner 62 and the optical demultiplexer 63 as in the switching unit 42_3 included in the optical receiver 2_6 shown in FIG. The optical combiner 62 combines and multiplexes the optical reception signals 51_1 and 51_2 received at the respective reception ports 41_1 and 41_2, and outputs the multiplexed optical signal 64 to the optical duplexer 63. The optical duplexer 63 selectively outputs each subcarrier reception signal 52_1 to 52_m included in the multiplexed optical signal 64 to each subcarrier reception unit 43_1 to 43_m.

That is, the optical duplexer 63 outputs the subcarrier reception signal 52_1 included in the multiplexed optical signal 64 to the subcarrier reception unit 43_1. Further, the optical duplexer 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 subcarrier reception signal 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 be done. In this case, the optical demultiplexer 63 can be configured by using the wavelength selection type optical demultiplexer 63.

Further, for example, as in the optical receiving device described in the latter half of the sixth embodiment, if each of the subcarrier receiving units 43_1 to 43_m can selectively receive a specific subcarrier receiving signal, one is used. A plurality of subcarrier reception signals may be input to the subcarrier reception unit 43_m. In this case, for example, the optical duplexer 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 duplexer 63.

<Embodiment 9>
Next, a ninth embodiment of the present invention will be described. FIG. 20 is a block diagram showing an 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 has a configuration in which the optical transmission device 1-1 described in the first embodiment and the optical reception device 2_1 described in the fifth embodiment are combined. ing.

As shown in FIG. 20, in the optical communication device 3 according to the present embodiment, the first transmission unit 11_1, the second transmission unit 11_2, the output unit 12, the switching unit 42, the first reception unit 43_1, and the first The receiver 43_2 of 2 is provided. The optical transmission signal 22_1 and the optical reception signal 51_1 are configured to be able to be transmitted and 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 via the second path.

Since 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, duplicated description is omitted. do. Further, since the configuration and operation of the switching unit 42, the first receiving unit 43_1, and the second receiving unit 43_1 are the same as those of the optical receiving device 2_1 described in the fifth embodiment, duplicated description is omitted. do.

Further, also in the optical communication device 3 according to the present embodiment, the configuration of the optical transmission device 1-2-1_6 described in the second to fourth embodiments may be applied, and the light described in the sixth to eighth embodiments may be applied. 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 device and an optical communication method capable of efficiently allocating resources in an optical communication network.

<Embodiment 10>
Next, a tenth embodiment of the present 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 transmitter 1 and optical receivers 70_1 and 70_2 that communicate with the optical transmitter 1. As the optical transmitter 1, the optical transmitters 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 for transmitting data using the subcarriers, respectively. The output unit 12 selectively outputs the respective 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. Since 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, duplicate description will be omitted.

The transmitting port 13_1 is connected to the receiving port 71_1 of the optical receiving device 70_1 via an optical fiber, and the transmitting port 13_1 is connected to the receiving port 71_2 of the optical receiving device 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 in which a plurality of optical transmission signals 21_m are multiplexed. The receiving unit 72_1 included in the optical receiving device 70_1 is configured to be able to receive such a multiplexed optical transmission signal. Similarly, the optical transmission signal 23_2 is a signal in which a plurality of optical transmission signals 21_m are multiplexed. The receiving unit 72_2 included in the optical receiving device 70_2 is configured to be able to receive such a multiplexed optical transmission signal.

Of the plurality of subcarrier transmitters 11_1 to 11_m, each subcarrier transmitter that transmits an optical transmission signal via the transmission port 13_1 transmits the first data converted in series and parallel to the optical receiver 70_1 in parallel. You may. Further, among the plurality of subcarrier transmitters 11_1 to 11_m, each subcarrier transmitter that transmits an optical transmission signal via the transmission port 13_2 transmits the second data converted in series-parallel to the optical receiver 70_2 in parallel. You may send it.

That is, the optical transmission device 1 converts the first data to be transmitted to the optical reception device 70_1 in series-parallel conversion, and generates an optical transmission signal for transmitting each of the series-parallel conversion data in the subcarrier transmission unit. And sends it to the optical receiver 70_1. The optical receiver 70_1 receives the series-parallel converted data included in the optical transmission signal 23_1, and acquires the first data converted in parallel and series by converting the received series-parallel converted data in parallel and series. can do. The same applies to the second data transmitted to the optical receiver 70_2.

Further, 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 the number of subcarrier transmission units 11_1 to 11_m that output an optical transmission signal to the transmission port 13_1. Determined based on. 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 of the transmission capacity of the optical transmission signal 23_1 to the transmission capacity of the optical transmission signal 23_1 is the number of subcarrier transmitters connected to the transmission port 13_1 and the number of subcarrier transmitters connected to the transmission port 13_2. Corresponds to the ratio of. 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, a subcarrier of the first wavelength band may be used for transmission between the optical transmission device 1 and the optical reception device 70_1, and a second transmission between the optical transmission device 1 and the optical reception device 70-2 may be used. Subcarriers in the wavelength band of 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 and the like used in WDM.

The communication settings between the optical transmission device 1 and the optical reception device 70_1 include the distance between the optical transmission device 1 and the optical reception device 70_1, the time zone for communication, and the optical transmission device 1 and the optical reception device. It may be determined according to at least one of the states of the transmission path to and from 70_1. Further, the optical transmitter 1 and the optical receiver 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 transmitter 1 and the optical receiver 70_1. Communication with and from may be set. The same applies to the setting of communication between the optical transmitter 1 and the optical receiver 70_2.

For example, as the communication distance between the optical transmitter 1 and the optical receiver 70_1 increases, the multivalued degree per subcarrier may be decreased and the number of subcarriers may be increased. On the contrary, as the communication distance between the optical transmitter 1 and the optical receiver 70_1 becomes shorter, the multivalued degree per subcarrier may be increased and the number of subcarriers may be decreased.

To specifically explain the case of using quadrature amplitude modulation (QAM) as an example, when the communication distance between the optical transmitter 1 and the optical receiver 70_1 is long, one modulation method such as 128QAM or 256QAM is used. Increasing the multiplicity per subcarrier increases the bit error rate. Therefore, in this case, a modulation method such as 16QAM or 64QAM is used to reduce the multi-level degree per subcarrier. Further, in this case, the amount of information contained in one subcarrier is reduced, so that the number of subcarriers is increased by this amount.

On the other hand, when the communication distance between the optical transmitting device 1 and the optical receiving device 70_1 is short, the multivalued degree per subcarrier can be increased by using a modulation method 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 reduced by this amount.

Further, for example, when the transmission path between the optical transmitting device 1 and the optical receiving device 70_1 deteriorates (such as when tension acts on the optical fiber), for example, the multivalued degree per subcarrier is reduced. May be good. By reducing the multivalued degree per subcarrier in this way, it is possible to suppress an increase in the bit error rate.

The communication arrangement in the optical communication system as described above can be determined by the optical transmitter 1 and the optical receivers 70_1 and 70_1.

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

<Embodiment 11>
Next, the 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 shown in FIG. 22, the optical communication system according to the present embodiment includes an optical transmitter 1, optical receivers 70_1 and 70_2 that communicate with the optical transmitter 1, and a controller 80. Since 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, duplicate description will be omitted. Further, also in the present embodiment, the optical transmission devices 1_1 to 1_6 described in the first to fourth embodiments can be used as the optical transmission device 1.

The controller 80 is provided to control the optical transmitting device 1 and the optical receiving devices 70_1 and 70_2, respectively. That is, the controller 80 controls the optical transmitting device 1 and the optical receiving devices 70_1 and 70_2 according to the communication state between the optical transmitting device 1 and the optical receiving device 70_1 and the communication state between the optical transmitting device 1 and the optical receiving device 70_2. Can be done.

FIG. 23 is a block diagram showing 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 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. The setting unit 82 sets the optical transmitting device 1 and the optical receiving devices 70_1 and 70_2, respectively, according to the monitoring result of the monitoring unit 81.

The controller 80 can set a subcarrier transmitter used for communication between the optical transmitter 1 and the optical receiver 70_1 and a subcarrier transmitter used for communication between the optical transmitter 1 and the optical receiver 70_1. At this time, the controller 80 can change the subcarrier transmitting unit used for communication with the respective optical receiving devices 70_1 and 70_2 by changing the setting of the output unit 12 included in the optical transmitting 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 transmission ports 13_1 and 13_2 to control the 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.

Further, the controller 80 sets the wavelength band of the subcarrier used for communication between the optical transmitter 1 and the optical receiver 70_1 and the wavelength band of the subcarrier used for communication between the optical transmitter 1 and the optical receiver 70_1. Can be done. For example, the controller 80 uses a subcarrier in the first wavelength band for communication between the optical transmitter 1 and the optical receiver 70_1, and also communicates between the optical transmitter 1 and the optical receiver 70_1. Can be set so that a subcarrier in the second wavelength band is 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 and the like used in WDM.

Further, the controller 80 depends on at least one of the distance between the optical transmitting device 1 and the optical receiving device 70_1, the time zone for communication, and the state of the transmission path between the optical transmitting device 1 and the optical receiving device 70_1. Therefore, it is possible to set the communication between the optical transmission device 1 and the optical reception device 70_1. Further, the controller 80 uses at least one of the wavelength band allocation of the subcarrier, the optical signal path, and the modulation method in the communication between the optical transmitter 1 and the optical receiver 70_1, and the optical transmitter 1 and the light. Communication with the receiving device 70_1 may be set. The same applies to the setting of communication between the optical transmitter 1 and the optical receiver 70_2.

For example, the controller 80 may decrease the multivalued degree per 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. On the contrary, as the communication distance between the optical transmitter 1 and the optical receiver 70_1 becomes shorter, the multivalued degree per 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.

Further, when the transmission path between the optical transmitting device 1 and the optical receiving device 70_1 deteriorates (for example, when tension acts on the optical fiber), the controller 80 reduces the multivalued degree per subcarrier, for example. You may let me. By reducing the multivalued degree per subcarrier in this way, it is possible to suppress an increase in the bit error rate. The same applies to the modulation method in the communication between the optical transmitter 1 and the optical receiver 70_2.

In the present embodiment, an optical communication system composed of one optical transmission device and two optical reception devices is given as an example, but the optical transmission device and the optical reception device constituting the optical communication system are further provided. May be good. In this case as well, the controller 80 can set the optical transmitter and the optical receiver so that the entire optical communication system is in the optimum 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 that prioritizes uninterrupted communication and takes into account redundant routes). , Communication state that emphasizes communication speed (communication state that always becomes the shortest path), communication state that maximizes wavelength usage efficiency, and so on.

Further, the controller 80 collects information on changes in the state of the network reported from the optical transmitting device and the optical receiving device (for example, a failure in an optical transmission line, deterioration of an optical communication signal, etc.), and follows the changes in the state of the network. As such, the optical transmitter and the optical receiver can be reconfigured so that the entire optical communication system is in the optimum communication state.

According to the invention according to the present embodiment described above, it is possible to provide an optical communication system and a control method of an optical communication system capable of efficiently allocating resources in an optical communication network. Further, it is possible to provide an optical communication system and a control method of the optical communication system so that the entire optical communication system is in an optimum communication state.

<Embodiment 12>
Next, a twelfth embodiment of the present 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. Further, the plurality of nodes A to D (85_a to 85_d) are elements constituting the communication network. For the plurality of nodes A to D (85_a to 85_d), 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 optical receivers 2_1 to 2_6 of the embodiment. The optical communication device 3 described in the ninth embodiment can be used.

The controller 80 monitors the communication status of the nodes 85_a to 85_d, and controls the nodes 85_a to 85_d according to the communication status 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 arrangements for resource allocation to be used in each node 85_a to 85_d (for example, arrangements for subcarrier transmission / reception units to be used) and arrangements for optical signal paths. For example, the controller 80 can change the transmission capacity between the node 85_a and the node 85_b by determining the subcarrier used for communication between the node 85_a and the node 85_b.

Further, 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 a subcarrier of the first wavelength band for communication between the node 85_a and the node 85_b, and a second wavelength band for communication between the node 85_a and the node 85_d. Subcarriers can be set to 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 and the like used in WDM.

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

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

Further, the controller 80 may reduce the multivalued degree per subcarrier, for example, when the transmission path between the node 85_a and the node 85_b deteriorates (such as when tension acts on the optical fiber). .. By reducing the multivalued degree per subcarrier in this way, it is possible to suppress an increase in the bit error rate. 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 given as an example, but the number of nodes constituting the optical communication system may be larger than this.

The controller 80 can set the optical transmitter and the optical receiver so that the entire optical communication system is in the optimum 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 that prioritizes uninterrupted communication and takes into account redundant routes). , Communication state that emphasizes communication speed (communication state that always becomes the shortest path), communication state that maximizes wavelength usage efficiency, and so on.

Further, the controller 80 collects information on changes in the state of the network reported from the optical transmitting device and the optical receiving device (for example, a failure in an optical transmission line, deterioration of an optical communication signal, etc.), and follows the changes in the state of the network. As such, the optical transmitter and the optical receiver can be reconfigured so that the entire optical communication system is in the optimum communication state.

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

According to the invention according to the present embodiment described above, it is possible to provide an optical communication system and a control method of an optical communication system capable of efficiently allocating resources in an optical communication network. Further, it is possible to provide an optical communication system and a control method of the optical communication system so that the entire optical communication system is in an optimum communication state.

<Embodiment 13>
Next, the thirteenth embodiment of the present 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 receiving device 2 and optical transmitting devices 75_1 and 75_2 that communicate with the optical receiving device 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 receiving device 2 includes receiving ports 41_1 and 41_2, a switching unit 42, and a plurality of subcarrier receiving units 43_1 to 43_m. The receiving 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 respective subcarrier reception signals 52_1 to 52_m included in the respective 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 receiving units 43_1 to 43_m receive the respective data included in the subcarrier receiving signals 52_1 to 52_m. Since the configuration and operation of the optical receiver 2 are the same as those of the optical receivers 2_1 to 2_6 described in the fifth to eighth embodiments, duplicate description will be omitted.

The transmission unit 77_1 included in the optical transmission device 75_1 is configured to be capable of transmitting a multiplexed optical transmission signal generated by using a plurality of subcarriers. The transmission unit 77_2 included in the optical transmission device 75_2 is configured to be capable of transmitting a multiplexed optical transmission signal generated by using a plurality of subcarriers. The receiving port 41_1 is connected to the transmitting port 76_1 of the optical transmitting device 75_1 via an optical fiber, and the receiving port 41_2 is connected to the transmitting port 76_2 of the optical transmitting device 75_1 via an optical fiber. The optical receiving device 2 receives the optical receiving signal 50_1 transmitted from the optical transmitting device 75_1 via the receiving port 41_1. Further, the optical receiving device 2 receives the optical receiving signal 50_2 transmitted from the optical transmitting device 75_2 via the receiving port 41_2.

At this time, among the plurality of subcarrier receiving units 43_1 to 43_m, each subcarrier receiving unit that receives the optical reception signal via the receiving port 41_1 is the first data (series-parallel conversion) transmitted from the optical transmission device 75_1. Data) may be received in parallel. Further, among the plurality of subcarrier receiving units 43_1 to 43_m, each subcarrier receiving unit that receives the optical reception signal via the receiving port 41_2 is the second data (series-parallel conversion) transmitted from the optical transmitting device 75_2. Data) may be received in parallel.

That is, the optical transmission device 75_1 converts the first data to be transmitted to the optical reception device 2 in series-parallel conversion, and transmits each of the series-parallel conversion data to the optical reception device 2 using each optical transmission signal. .. The optical receiving device 2 receives the subcarrier receiving signal included in the optical transmitting signal (that is, the optical receiving signal 50_1) transmitted from the optical transmitting device 75_1 at the subcarrier receiving unit. Then, by performing parallel-series conversion of the data included in the subcarrier reception signal, it is possible to acquire the first data that has been parallel-series converted. The same applies to the second data transmitted from the optical transmitter 75_2 to the optical receiver 2.

Further, in the optical communication system according to the present embodiment, the transmission capacity between the optical receiving device 2 and the optical transmitting device 75_1 corresponds to the number of subcarrier receiving units connected to the receiving 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 receive port 41-2. For example, when increasing the transmission capacity between the optical receiving device 2 and the optical transmitting device 75_1, the switching unit 42 is controlled to increase the number of subcarrier receiving units connected to the receiving port 41_1.

Further, a subcarrier of the first wavelength band may be used for transmission between the optical receiving device 2 and the optical transmitting device 75_1, and a second transmission between the optical receiving device 2 and the optical transmitting device 75_1 may be used. Subcarriers in the wavelength band of 2 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 and the like used in WDM.

Further, the communication settings between the optical receiver 2 and the optical transmitter 75_1 are set according to the distance between the optical receiver 2 and the optical transmitter 75_1, the time zone for communication, and the optical receiver 2 and the optical transmitter. It may be determined according to at least one of the states of the transmission path to and from 75_1. Further, the optical receiver 2 and the optical transmitter 75_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 receiver 2 and the optical transmitter 75_1. Communication with and from may be set. The same applies to the setting of communication between the optical receiving device 2 and the optical transmitting device 75_2.

For example, as the communication distance between the optical receiver 2 and the optical transmitter 75_1 increases, the multivalued degree per 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 multivalued degree per 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 receiving device 2 and the optical transmitting device 75_2.

Further, for example, when the transmission path between the optical receiver 2 and the optical transmitter 75_1 deteriorates (such as when tension acts on the optical fiber), for example, the multivalued degree per subcarrier is reduced. May be good. By reducing the multivalued degree per subcarrier in this way, it is possible to suppress an increase in the bit error rate.

The communication arrangement in the optical communication system as described above may be determined by the optical receiving device 2 and the optical transmitting devices 75_1 and 75_1. Further, the optical communication system according to the present embodiment may include a controller as in the optical communication system described in the eleventh embodiment. Also in the present embodiment, the controller includes the optical receiving device 2 and the optical transmitting devices 75_1 and 75_2 according to the communication state between the optical receiving device 2 and the optical transmitting device 75_1 and the communication state between the optical receiving device 2 and the optical transmitting device 75_2. May be controlled.

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

<Embodiment 14>
Next, Embodiment 14 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 transmitters 1a and 1b and optical receivers 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, and the output units 12a and 12b correspond to the output unit 12 in FIG. , 13_2a, 13_1b, 13_2b correspond to the transmission ports 13_1 and 13_2 of 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 receiving devices 2a and 2b, the optical receiving devices 2_1 to 2_6 described in the fifth to eighth embodiments can be used. For example, the receiving ports 41_1a, 41_2a, 41_1b, 41_2b correspond to the receiving ports 41_1 and 41_2 of FIG. 15, and the switching units 42a and 42b correspond to the switching unit 42 of FIG. 15, and the subcarrier receiving unit 43a, 43b corresponds to the subcarrier receiving units 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 by using the plurality of subcarriers in the first wavelength band. Further, the optical transmission device 1a transmits data to the optical reception device 2b using the optical transmission signal 23_2a generated by using the plurality of subcarriers in the second wavelength band. Further, the optical transmission device 1b transmits data to the optical reception device 2a using the optical transmission signal 23_1b generated by using the plurality of subcarriers in the second wavelength band. Further, the optical transmission device 1b transmits data to the optical reception device 2b using the optical transmission signal 23_2b generated by using the 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 and the like used in WDM.

By making the combination of the wavelength bands of the respective optical transmission signals 23_1a, 23_2a, 23_1b, and 23_2b used in the 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 is possible to prevent the wavelength bands of the subcarriers used in the communication between the 1b and the optical receiving devices 2a and 2b from overlapping.

Also 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 the distance, the time zone for communication, and at least one of the states of the transmission path between the optical transmitting devices 1a and 1b and the optical receiving devices 2a and 2b. Further, the optical transmitter 1a, using at least one of the subcarrier wavelength band allocation, the optical signal path, and the modulation method in the communication between the optical transmitters 1a and 1b and the optical receivers 2a and 2b, Communication may be set between 1b and the optical receivers 2a and 2b.

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

<Embodiment 15>
Next, the fifteenth embodiment of the present 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 devices 3 described in the ninth embodiment (see FIG. 20) can be used. See FIG. 5 (Embodiment 2) and FIG. 15 (Embodiment 6) for more detailed configurations.

Here, the subcarrier transmission / reception unit 91a of the optical communication device 3a includes the subcarrier transmission units 11_1 to 11_m of FIG. 5 and the subcarrier reception units 43_1 to 43_m of FIG. 15, and the optical transmission / reception signal switching unit 92a outputs the output of FIG. The transmission / reception ports 93_1a and 93_2a include the unit 12 and the switching unit 42 of FIG. 15, and 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 communicate using the optical signal 25_1 generated by using the plurality of subcarriers in the first wavelength band. Further, the optical communication device 3a and the optical communication device 3d communicate with each other using the optical signal 25_2 generated by using the plurality of subcarriers in the second wavelength band. Further, the optical communication device 3b and the optical communication device 3c communicate using the optical signal 25_3 generated by using the plurality of subcarriers in the second wavelength band. Further, the optical communication device 3b and the optical communication device 3d communicate using the optical signal 25_4 generated by using the 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 and the like used in WDM.

Subcarriers used in communication between optical communication devices 3a to 3d by combining the wavelength bands of the respective optical signals 25_1 to 25_4 used in communication between the optical communication devices 3a to 3d as described above. It is possible to suppress the overlap of the wavelength bands of.

Also in the optical communication system according to the present embodiment, the communication setting between the optical communication devices 3a to 3d is such that the distance between the optical communication devices 3a and 3b and the optical communication devices 3c and 3d and the communication are performed. It may be determined according to the time zone and at least one of the states of the transmission path between the optical communication devices 3a and 3b and the optical communication devices 3c and 3d. Further, 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.

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

In the above-described embodiment, the present invention has been described as a hardware configuration, but the present invention is not limited thereto. The present invention can also be realized by causing a CPU (Central Processing Unit) to execute a computer program.

Programs can be stored and supplied to a computer using various types of non-transitory computer readable medium. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-temporary computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs. It includes a CD-R / W, a semiconductor memory (for example, a mask ROM, a PROM (Programmable ROM), an EPROM (Erasable PROM), a flash ROM, and a RAM (random access memory)). The program may also be supplied to the computer by various types of transient computer readable medium. Examples of temporary computer-readable media include electrical, optical, 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 invention of the present application has been described above with reference to the embodiments, the invention of the present application is not limited to the above. Various changes that can be understood by those skilled in the art can be made within the scope of the invention in the configuration and details of the invention of the present application.

1, 1_1 to 1_1 Optical transmitter 2, 2_1 to 2_1 Optical receiver 3 Optical communication device 11, 11_1 to 11_m Subcarrier transmitter 12 Optical transmitter signal switching unit 13 Transmission port 14 Light source 15 Subcarrier generator 16 Signal converter 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_1 Second path 30 Switching unit 31_1, 31_1 Optical combiner 32 Optical duplexer 33 Optical duplexer 41_1, 41_2 Reception port 42 Switching unit 43_1 to 43_m Subcarrier receiving unit 44_1, 44_2 Local oscillator 45 Signal processing unit 51_1, 51-2 Optical receiving signal 52_1 to 52_m Subcarrier receiving signal 53_1 to 53_6 Received signal 60_1, 60_2 Optical brancher 61 Optical selector switch 62 Optical combiner Instrument 63 Optical demultiplexer 64 Multiplexed optical signal 80 Controller 81 Monitoring unit 82 Setting unit

Claims (62)

A first transmitter that transmits a first optical transmission signal containing the first data,
A second transmitter that transmits a second optical transmission signal containing the second data,
When the first data and the second data are converted from common data , both the first optical transmission signal and the second optical transmission signal are output to the same path, and the first When the data 1 and the second data are not converted from the common data , an output unit that outputs each of the first optical transmission signal and the second optical transmission signal to different paths, and an output unit.
An optical transmitter equipped with. Predetermined parameters of the first subcarrier used when generating the first optical transmission signal and the second subcarrier used when generating the second optical transmission signal do not overlap each other. The optical transmitter according to claim 1, which is assigned. The predetermined parameter is a plurality of parameters.
The optical transmission device according to claim 2, wherein the first subcarrier and the second subcarrier are arranged so as not to overlap each other on a matrix centered on the plurality of parameters. The optical transmitter according to claim 2 or 3, wherein the predetermined parameter is at least one of wavelength, polarization, and time. The first and second transmission units use the light supplied from the light source to generate the first and second optical transmission signals having different wavelengths from each other, which is any one of claims 1 to 4. The optical transmitter according to the above. A first subcarrier is supplied from the first light source to the first transmission unit, and the first subcarrier is supplied.
A second subcarrier is supplied to the second transmitter from the second light source.
The optical transmitter according to claim 5. With a single light source
The first and second subcarriers are generated using the light generated by the single light source, and the generated first and second subcarriers are supplied to the first and second transmitters, respectively. Further equipped with a carrier generation unit,
The optical transmitter according to claim 5. The claim that the subcarrier generation unit generates the first and second subcarriers that are orthogonal to each other by modulating the light generated by the single light source by using an orthogonal frequency division multiplexing method. 7. The optical transmitter according to 7. When the first data and the second data are converted from the common data , the series-parallel converted data is supplied to the first and second transmitters.
The first and second transmitters transmit the series-parallel converted data in parallel,
The output unit outputs both the first and second optical transmission signals to the same path.
The optical transmitter according to any one of claims 1 to 8. The output unit
A switching unit that switches the output destination of the first and second optical transmission signals output from the first and second transmission units, and a switching unit.
It is provided so as to correspond to the first and second paths, and includes first and second optical combiners that combine the first and second optical transmission signals output from the switching unit.
The optical transmitter according to any one of claims 1 to 9. The switching unit is provided so as to correspond to the first and second transmission units, and outputs destinations of the first and second optical transmission signals output from the first and second transmission units, respectively. The optical transmitter according to claim 10, further comprising first and second optical switches for switching to the first optical combiner or the second optical combiner. The output unit
An optical combiner that combines the first and second optical transmission signals output from the first and second transmitters, and
An optical demultiplexer that selectively outputs the first and second optical transmission signals contained in the multiplexed optical signal output from the optical combiner to the first and second paths. Prepare, prepare
The optical transmitter according to any one of claims 1 to 9. The first and second receivers that receive the subcarrier reception signal,
A switching unit for outputting the input first subcarrier reception signal and the second subcarrier reception signal to the first and second reception units is provided.
The switching unit is
When the data included in each of the first and second subcarrier reception signals is converted from the common data , the first and second subcarrier reception signals are received via the same route. At the same time, the first subcarrier reception signal is output to the first receiving unit, and the second subcarrier reception signal is output to the second receiving unit.
When the data contained in each of the first subcarrier reception signal and the second subcarrier reception signal is not converted from the common data , the first and second subcarrier reception signals are routed differently from each other. The first subcarrier reception signal is output to the first receiving unit, and the second subcarrier reception signal is output to the second receiving unit.
Optical receiver. Further, a signal processing unit for processing the first received signal output from the first receiving unit and the second received signal output from the second receiving unit is further provided.
The signal processing unit compensates for the influence of mutual interference between the first subcarrier reception signal and the second subcarrier reception signal.
The optical receiver according to claim 13. The first and second receivers include first and second local oscillators, respectively.
The signal processing unit controls the first and second local oscillators in response to the first and second subcarrier reception signals to control the first and second subcarrier reception signals and the first subcarrier reception signal and the second subcarrier. The optical receiver according to claim 14, which compensates for the influence of mutual interference with the received signal. A plurality of subcarrier reception signals can be input to each of the receiving units.
Each of the receiving units receives the plurality of input subcarriers by interfering with the locally oscillating light generated by each local oscillator included in each of the receiving units and the input subcarrier receiving signal. Selectively receive a specific subcarrier reception signal from the signals,
The optical receiver according to any one of claims 13 to 15. A plurality of receiving units including the first receiving unit share the first local oscillator.
A plurality of receivers including the second receiver share a second local oscillator.
The optical receiver according to claim 13, wherein the first and second local oscillators are controlled according to the subcarrier reception signal. The optical receiving device according to claim 17, wherein when a plurality of receiving units including the first receiving unit do not receive the subcarrier reception signal, the first local oscillator is turned off. Each of the receiving units that received the subcarrier reception signal via the first path among the plurality of receiving units receives the first data that has been converted in series and parallel in parallel.
Of the plurality of receiving units, each receiving unit that has received the subcarrier reception signal via the second path receives the second data converted in series and parallel in parallel.
The optical receiver according to any one of claims 13 to 18. The switching unit is
Multiple optical turnouts that branch the received optical reception signal,
It includes an optical changeover switch that selects and outputs a subcarrier reception signal to be output to each of the reception units from the optical reception signals branched by the plurality of optical turnouts.
The optical receiver according to any one of claims 13 to 19. The optical changeover switch is provided so as to correspond to each of the receiving units, and selects a subcarrier receiving signal to be output to each of the receiving units from the optical receiving signals branched by the plurality of optical branching devices. 20. The optical receiver according to claim 20, further comprising an optical switch that outputs light. The switching unit is
An optical combiner that combines each received optical reception signal,
An optical demultiplexer that selectively outputs each of the subcarrier reception signals included in the multiplexed optical signal output from the optical combiner to each of the receiving units is provided.
The optical receiver according to any one of claims 13 to 18. A first transmitter that transmits a first optical transmission signal containing the first data,
A second transmitter that transmits a second optical transmission signal containing the second data,
When the first data and the second data are converted from common data , both the first optical transmission signal and the second optical transmission signal are output to the same path, and the first When the data 1 and the second data are not converted from the common data , an output unit that outputs each of the first optical transmission signal and the second optical transmission signal to different paths, and an output unit.
The first and second receivers that receive the subcarrier reception signal,
A switching unit for outputting the input first subcarrier reception signal and the second subcarrier reception signal to the first and second reception units is provided.
The switching unit is
When the data included in each of the first and second subcarrier reception signals is converted from the common data , the first and second subcarrier reception signals are received via the same route. At the same time, the first subcarrier reception signal is output to the first receiving unit, and the second subcarrier reception signal is output to the second receiving unit.
When the data contained in each of the first subcarrier reception signal and the second subcarrier reception signal is not converted from the common data , the first and second subcarrier reception signals are routed differently from each other. The first subcarrier reception signal is output to the first receiving unit, and the second subcarrier reception signal is output to the second receiving unit.
Optical communication device. An optical communication system including an optical transmitter and first and second optical receivers.
The optical transmitter is
A first transmitter that transmits a first optical transmission signal containing the first data,
A second transmitter that transmits a second optical transmission signal containing the second data,
When the first data and the second data are converted from common data , both the first optical transmission signal and the second optical transmission signal are sent to the first optical receiver. When the first data and the second data are not converted from the common data, either one of the first optical transmission signal and the second optical transmission signal is output as the first optical transmission signal. An output unit that outputs data to the optical receiver and outputs the other to the second optical receiver.
Optical communication system including. Predetermined parameters of the first subcarrier used when generating the first optical transmission signal and the second subcarrier used when generating the second optical transmission signal do not overlap with each other. The optical communication system according to claim 24, which is assigned. The predetermined parameter is a plurality of parameters.
The optical communication system according to claim 25, wherein the first subcarrier and the second subcarrier are arranged so as not to overlap each other on a matrix centered on the plurality of parameters. The optical communication system according to claim 25 or 26, wherein the predetermined parameter is at least one of wavelength, polarization, and time. The first and second transmission units use the light supplied from the light source to generate the first and second optical transmission signals having different wavelengths from each other, according to any one of claims 24 to 27. The optical communication system described in. A first subcarrier is supplied from the first light source to the first transmission unit, and the first subcarrier is supplied.
A second subcarrier is supplied to the second transmitter from the second light source.
28. The optical communication system according to claim 28. With a single light source
The first and second subcarriers are generated using the light generated by the single light source, and the generated first and second subcarriers are supplied to the first and second transmitters, respectively. Further equipped with a carrier generation unit,
28. The optical communication system according to claim 28. The claim that the subcarrier generation unit generates the first and second subcarriers that are orthogonal to each other by modulating the light generated by the single light source by using an orthogonal frequency division multiplexing method. 30. The optical communication system. When the first data and the second data are converted from common data The first and second transmitters are supplied with the series-parallel converted data.
The first and second transmitters transmit the series-parallel converted data in parallel,
The output unit outputs both the first and second optical transmission signals to the first optical receiver.
The optical communication system according to any one of claims 24 to 31. The output unit
A switching unit that switches the output destination of the first and second optical transmission signals output from the first and second transmission units, and a switching unit.
It is provided so as to correspond to the first and second paths, and includes first and second optical combiners that combine the first and second optical transmission signals output from the switching unit.
The optical communication system according to any one of claims 24 to 32. The switching unit is provided so as to correspond to the first and second transmission units, and outputs destinations of the first and second optical transmission signals output from the first and second transmission units, respectively. 33. The optical communication system according to claim 33, further comprising first and second optical switches for switching to the first optical combiner or the second optical combiner. The output unit
An optical combiner that combines the first and second optical transmission signals output from the first and second transmitters, and
An optical duplexer that selectively outputs the first and second optical transmission signals contained in the multiplexed optical signal output from the optical combiner to the first and second optical receivers. And with
The optical communication system according to any one of claims 24 to 32. An optical transmission device that transmits a first optical transmission signal including the first data and a second optical transmission signal including the second data, and an optical transmission device.
The first and second optical receivers that receive the first and second optical transmission signals, and
A controller for controlling the optical transmitter is provided.
The optical transmission apparatus, according to an instruction from the controller, when the first data and the second data were converted from common data, the first optical transmission signal及beauty second When the optical transmission signal of the above is output to the first optical receiving device and the first data and the second data are not converted from common data, the first optical transmission signal and the second One of the optical transmission signals of is output to the first optical receiving device, and the other is output to the second optical receiving device.
Optical communication system. The controller describes the distance between the optical transmitter and the first optical receiver, the time of communication, and the state of the transmission path between the optical transmitter and the first optical receiver. 36. The optical communication system according to claim 36, which sets up communication between the optical transmitter and the first optical receiver according to at least one. The controller uses at least one of a subcarrier wavelength band allocation, an optical signal path, and a modulation scheme in communication between the optical transmitter and the first optical receiver. 36 or 37. The optical communication system according to claim 36 or 37, which sets up communication between the first optical receiver and the first optical receiver. The controller claims that as the communication distance between the optical transmitter and the first optical receiver increases, the multivalued degree per subcarrier decreases and the number of subcarriers increases. Item 3. The optical communication system according to any one of Items 36 to 38. An optical communication system including first and second optical transmitters and optical receivers.
The optical receiver is
The first and second receivers that receive the subcarrier reception signal,
A switching unit for outputting the input first subcarrier reception signal and the second subcarrier reception signal to the first and second reception units is provided.
The switching unit is
When the data contained in each of the first and second subcarrier reception signals is converted from the common data , the first and second subcarrier reception signals are received from the same optical transmitter. At the same time, the first subcarrier reception signal is output to the first receiving unit, and the second subcarrier reception signal is output to the second receiving unit.
When the data contained in each of the first subcarrier reception signal and the second subcarrier reception signal is not converted from the common data , the first and second subcarrier reception signals are different from each other. While receiving from the transmitting device, the first subcarrier reception signal is output to the first receiving unit, and the second subcarrier receiving signal is output to the second receiving unit.
Optical communication system. The optical receiving device further includes a signal processing unit that processes a first receiving signal output from the first receiving unit and a second receiving signal output from the second receiving unit.
The signal processing unit compensates for the influence of mutual interference between the first subcarrier reception signal and the second subcarrier reception signal.
The optical communication system according to claim 40. The first and second receivers include first and second local oscillators, respectively.
The signal processing unit controls the first and second local oscillators in response to the first and second subcarrier reception signals to control the first and second subcarrier reception signals and the first subcarrier reception signal and the second subcarrier. The optical communication system according to claim 41, which compensates for the influence of mutual interference with a received signal. A plurality of subcarrier reception signals can be input to each of the receiving units.
Each of the receiving units receives the plurality of input subcarriers by interfering with the locally oscillating light generated by each local oscillator included in each of the receiving units and the input subcarrier receiving signal. Selectively receive a specific subcarrier reception signal from the signals,
The optical communication system according to any one of claims 40 to 42. A plurality of receiving units including the first receiving unit share the first local oscillator.
A plurality of receivers including the second receiver share a second local oscillator.
The optical communication system according to claim 40, wherein the first and second local oscillators are controlled according to the subcarrier reception signal. The optical communication system according to claim 44, wherein when a plurality of receiving units including the first receiving unit do not receive the subcarrier reception signal, the first local oscillator is turned off. Each receiver that has received the subcarrier reception signal transmitted from the first optical transmitter receives the first data that has been converted in series and parallel in parallel.
Each receiver that has received the subcarrier reception signal transmitted from the second optical transmitter receives the second data that has been converted in series and parallel in parallel.
The optical communication system according to any one of claims 40 to 45. The switching unit is
Multiple optical turnouts that branch the received optical reception signal,
It includes an optical changeover switch that selects and outputs a subcarrier reception signal to be output to each of the reception units from the optical reception signals branched by the plurality of optical turnouts.
The optical communication system according to any one of claims 40 to 46. The optical changeover switch is provided so as to correspond to each of the receiving units, and selects a subcarrier receiving signal to be output to each of the receiving units from the optical receiving signals branched by the plurality of optical branching devices. The optical communication system according to claim 47, further comprising an optical switch that outputs light. The switching unit is
An optical combiner that combines each received optical reception signal,
An optical demultiplexer that selectively outputs each of the subcarrier reception signals included in the multiplexed optical signal output from the optical combiner to each of the receiving units is provided.
The optical communication system according to any one of claims 40 to 46. The optical communication according to any one of claims 40 to 49, further comprising a controller for controlling the first and second optical transmitting devices and the optical receiving device, respectively, according to the communication state of the optical communication system. system. The controller describes the distance between the first optical transmitter and the optical receiver, the time of communication, and the state of the transmission path between the first optical transmitter and the optical receiver. The optical communication system according to claim 50, wherein communication between the first optical transmitting device and the optical receiving device is set according to at least one. The controller uses at least one of a subcarrier wavelength band allocation, an optical signal path, and a modulation scheme in communication between the first optical transmitter and the optical receiver. The optical communication system according to claim 50 or 51, wherein communication between the optical transmitter and the optical receiver is set. The controller claims that as the communication distance between the first optical transmitter and the optical receiver increases, the multivalued degree per subcarrier decreases and the number of subcarriers increases. Item 5. The optical communication system according to any one of Items 50 to 52. In an optical communication system including an optical transmitter and first and second optical receivers,
Relative to the optical transmitter, when the first optical transmission signal and a second optical transmission signal includes the converted data from the common data, the first optical transmission signal及beauty second optical transmission signal the When the first optical transmission signal and the second optical transmission signal do not include data converted from common data, the first optical transmission signal and the second optical transmission signal are output. One of them is output to the first optical receiving device, and the other is output to the second optical receiving device.
controller. The controller
A monitoring unit that monitors the communication status of the optical communication system,
A setting unit for setting the optical transmitter and the first and second optical receivers according to the monitoring result in the monitoring unit is provided.
The controller according to claim 54. At least one of the distance between the optical transmitter and the first optical receiver, the time zone for communication, and the state of the transmission path between the optical transmitter and the first optical receiver. The controller according to claim 54 or 55, which sets up communication between the optical transmitter and the first optical receiver accordingly. Using at least one of the subcarrier wavelength band allocation, optical signal path, and modulation scheme in communication between the optical transmitter and the first optical receiver, the optical transmitter and the first. The controller according to any one of claims 54 to 56, which sets up communication with the optical receiver of the above. Claims 54 to 57 increase the multivalued degree per subcarrier and increase the number of subcarriers as the communication distance between the optical transmitter and the first optical receiver increases. The controller according to any one of the above. A control method for an optical communication system including an optical transmitter and first and second optical receivers.
The optical transmitter is
A first transmitter that transmits a first optical transmission signal containing the first data,
A second transmitter that transmits a second optical transmission signal containing the second data,
When the first data and the second data are converted from common data , both the first optical transmission signal and the second optical transmission signal are sent to the first optical receiver. When the first data and the second data are not converted from the common data, either one of the first optical transmission signal and the second optical transmission signal is output as the first optical transmission signal. An output unit that outputs data to the optical receiver and outputs the other to the second optical receiver is provided.
The optical transmitter and the first and second optical receivers are controlled according to the communication state of the optical communication system, respectively.
Control method of optical communication system. A program that controls an optical communication system including an optical transmitter and first and second optical receivers.
The optical transmitter is
A first transmitter that transmits a first optical transmission signal containing the first data,
A second transmitter that transmits a second optical transmission signal containing the second data,
When the first data and the second data are converted from common data , both the first optical transmission signal and the second optical transmission signal are sent to the first optical receiver. When the first data and the second data are not converted from the common data, either one of the first optical transmission signal and the second optical transmission signal is output as the first optical transmission signal. An output unit that outputs data to the optical receiver and outputs the other to the second optical receiver is provided.
A program for causing a computer to execute a process of controlling the optical transmitter and the first and second optical receivers according to the communication state of the optical communication system. Generate a first optical transmission signal containing the first data,
Generate a second optical transmission signal containing the second data,
When the first data and the second data are converted from common data , both the first optical transmission signal and the second optical transmission signal are output to the same path, and the first When the data 1 and the second data are not converted from the common data, the first optical transmission signal and the second optical transmission signal are output to different paths from each other.
Optical transmission method. When the first and second subcarrier reception signals include data converted from the same data , the first and second subcarrier reception signals are received via the same route, and the first sub is received. The carrier reception signal is output to the first receiving unit, and the second subcarrier reception signal is output to the second receiving unit.
When the first subcarrier reception signal and the second subcarrier reception signal do not include data converted from the same data , the first and second subcarrier reception signals are received via different routes. At the same time, the first subcarrier reception signal is output to the first receiving unit, and the second subcarrier reception signal is output to the second receiving unit.
Optical reception method.

Images