JP2001197040A - Burst optical communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economical optical communication device which eliminates the need for the wavelength management of an optical transmitting circuit, can use the same wavelength at the same time, and is suitable for an increase in capacity. SOLUTION: First and second carrier modulation parts 1021 and 1022 modulate an input signal of a base band with carriers of mutually different frequency, 1st and 2nd variable-wavelength optical modulation parts 1031 and 1032 convert the modulated signals into optical signals of 1st wavelength and 2nd wavelength, and an optical multiplexing part 104 multiplexes and sends them out to an optical transmission line 105. A wavelength separation part 106 output respective wavelength components of the multiplexed optical signal and 1st and 2nd optical reception parts 1071 and 1072 reconvert those wavelength components into electric signals; and 1st and 2nd transmission parts 1081 and 1082 transmit only signal components of respective frequencies and 1st and 2nd burst demodulation parts 1091 and 1092 demodulate the modulated signals from the transmission parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical communication apparatus for transmitting a burst signal, and more specifically, to switch and select the transmission path using the wavelength of the optical signal as address information.
The present invention relates to an optical communication device for transmitting a burst signal.

[0002]

2. Description of the Related Art Conventionally, a variable wavelength light source is used as a light source of an optical transmission circuit, a burst-like optical signal is transmitted using the wavelength as address information, and a signal is transmitted on an optical transmission path.
An optical communication device is used in which a wavelength separation unit having an output terminal different according to the wavelength is installed. With such a device, a spontaneous and high-speed switching of the signal transmission path in the optical domain is enabled, and a high-speed and large-capacity burst optical communication device can be realized. An optical communication device having such a configuration is disclosed in, for example, the document “F. Farjady, MC.
Parker, S.M. D. Walker: Hyper
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FIG. 8 is a block diagram showing a configuration of an optical communication apparatus in the above-described conventional example. In FIG. 8, the present optical communication apparatus includes an optical transmission circuit 510 and two reception circuits, that is, first and second optical reception circuits 5111 and 5112. 1 shows a configuration for realizing burst (intermittent) communication.

The present optical communication apparatus further comprises an optical transmission line 505 for transmitting an optical signal, and first and second optical receiving circuits 5111 and 51 which separate an input optical signal for each wavelength.
12 is further provided.

[0005] The optical transmission circuit 510 includes a baseband signal source 501 for outputting a signal containing data to be transmitted, and a variable wavelength optical modulator 502 for converting an input signal into an optical signal.

[0006] The first optical receiving circuit 5111 includes a first optical receiving unit 5071 that converts an input optical signal into an electric signal. Similarly, the second optical receiving circuit 5112 converts the input optical signal into an electric signal.
including.

[0007] In the optical communication apparatus configured as described above, the baseband signal source 501 intermittently outputs, for example, a baseband digital signal. The variable wavelength light modulator 502 includes a variable wavelength light source capable of changing the wavelength of an optical signal. Then, only when the baseband digital signal is output from the baseband signal source, the variable wavelength light modulation unit 502 modulates the light output from the light source with the baseband signal and outputs the burst optical signal intermittently. I do.

Here, the output light wavelength of the above-mentioned variable wavelength light source included in the variable wavelength light modulation section 502 has the first wavelength λ1 within the period of transmitting the burst optical signal to the first optical reception section 5071. During the period of transmitting the burst optical signal to the second optical receiver 5072,
Is set to the wavelength λ2.

Generally, the wavelength separation unit 506 is an AWG
(Arrayed Wave Guide) or the like, and has two output ports. Wavelength separation unit 50
6 receives an optical signal transmitted through the optical transmission line 505, outputs a first wavelength component from a first output port, and outputs a second wavelength component from a second output port. .

[0010] The first optical receiver 5071 includes a wavelength demultiplexer 5.
06 is connected to the first output port of the second optical receiving unit 5.
Reference numeral 072 is connected to the second output port of the wavelength separation unit 506. The first optical receiving unit 5071 includes a wavelength separating unit 506.
The optical signal having the first wavelength λ1 intermittently output from the first output port is input, converted into an electric signal, and output intermittently. The second optical receiving unit 5072 includes:
An optical signal having the second wavelength λ2 intermittently output from the second output port of the wavelength separation unit 506 is input, converted into an electrical signal, and output intermittently.

As described above, in the conventional optical communication device, a variable wavelength light source is used as a light source of an optical transmission circuit, a burst-like optical signal is transmitted using the wavelength as address information, and A wavelength separation unit having an output terminal different according to the wavelength is provided. As a result, spontaneous and high-speed switching of the signal transmission path in the optical domain is enabled, and a high-speed, large-capacity burst optical communication device can be realized.

[0012]

However, such a conventional optical communication device is provided with only one optical transmission circuit. Therefore, when a plurality of optical transmission circuits are provided as they are, a baseband digital signal is used as a transmission signal. Therefore, if optical signals from the plurality of optical transmission circuits are simultaneously input to one optical reception circuit, The spectra of the transmission signals overlap each other, making it impossible to reproduce each of them. As a result, a case may occur where a signal cannot be transmitted.

[0013] Therefore, an object of the present invention is to provide a burst optical system which can cope with a large capacity without a collision of the wavelengths of the output lights from the plurality of optical transmission circuits even when a plurality of optical transmission circuits are provided. To provide a communication device.

[0014]

A first aspect of the present invention is an optical communication apparatus for transmitting an intermittent optical signal from a transmitting side to a receiving side using wavelength information of an optical signal as an address. , M transmitting intermittent optical signals (where m
Is a natural number of 2 or more), n optical receiving circuits (where n is a natural number of 2 or more) for receiving an optical signal from each optical transmitting circuit, An optical transmission circuit interconnecting each optical receiving circuit, and each optical transmitting circuit intermittently sends out burst optical signals output from the input intermittent signal as an original signal so as not to collide with each other. Then, the optical transmission circuit multiplexes the burst optical signals output from the respective optical transmission circuits, separates the optical signals into a predetermined number of optical signals corresponding to the n optical reception circuits, and separates the optical signals. The optical signals output from the n output ports are individually output, and each optical receiving circuit converts the optical signal output from the corresponding output port into an electric signal and outputs the electric signal intermittently.

According to the first aspect of the present invention, even when a plurality of optical transmission circuits are provided, it is possible to realize a burst optical communication apparatus in which the wavelengths of output lights from the plurality of optical transmission circuits do not collide. .

A second invention is the optical communication apparatus according to the first invention, further comprising a wavelength traffic management unit, wherein each optical transmission circuit converts an input intermittent signal into a burst optical signal, An output light wavelength is set to any one of n different wavelengths predetermined corresponding to the n light receiving circuits, and includes a variable wavelength light modulator that intermittently sends the burst optical signal, The wavelength traffic management unit controls the wavelengths of the burst optical signals transmitted from the variable wavelength optical modulation units so that they do not coincide with each other, and the optical transmission circuit multiplexes the burst optical signals output from each optical transmission circuit. An optical multiplexing unit that outputs a multiplexed optical signal, and the multiplexed optical signal input from the optical multiplexing unit is separated into optical signals for each predetermined wavelength corresponding to the n optical receiving circuits, Let the separated optical signal be n
A wavelength separation unit that individually outputs from the output ports, each optical receiving circuit converts an optical signal output from a corresponding output port in the wavelength separation unit into an electric signal, and outputs an optical signal intermittently. Includes a receiver.

In the second invention, a variable wavelength light source is used as a light source of a plurality of optical transmission circuits, a burst-like optical signal is transmitted using the wavelength as address information, and the optical signal is transmitted on an optical transmission path. A wavelength separation unit having different output terminals according to the wavelength is provided. As a result, it is possible to realize a burst optical communication device that enables spontaneous and high-speed switching of a signal transmission path in the optical domain. Further, each wavelength is controlled so that the wavelengths of the output lights from the plurality of optical transmission circuits do not match.

A third aspect of the present invention is the optical communication apparatus according to the first aspect, wherein each optical transmission circuit uses the input intermittent signal as an original signal and has a unique frequency different from other optical transmission circuits. Create a burst modulation signal using a carrier having a carrier modulation unit that outputs intermittently, and convert the burst modulation signal from the carrier modulation unit to a burst optical signal,
A variable wavelength optical modulator for setting the output optical wavelength to one of n different wavelengths predetermined for the n optical receiving circuits and transmitting the burst optical signal intermittently. The optical transmission circuit multiplexes the burst optical signals output from the respective optical transmission circuits, and outputs an optical multiplexing unit that outputs a multiplexed optical signal, and the multiplexed optical signal input from the optical multiplexing unit into n optical signals. A wavelength separation unit that separates the optical signals into predetermined predetermined wavelengths corresponding to the receiving circuits, and individually outputs the separated optical signals from n output ports.
The optical signal output from the corresponding output port in the wavelength separation unit is converted to an electric signal, the optical receiving unit that outputs intermittently, and receives the electric signal that is output intermittently from the optical receiving unit,
Any one of burst modulation signals from m optical transmission circuits
And a burst demodulation unit for demodulating a burst modulation signal intermittently output from the transmission unit.

In the third invention, different carrier frequencies are assigned to the plurality of optical transmitting circuits, and each optical receiving circuit has a configuration in which a desired frequency is selected. As a result, even when optical signals from a plurality of optical transmission circuits are simultaneously input to one optical receiving circuit, separation and extraction of each transmission signal can be facilitated. In addition, complicated wavelength management between optical transmission circuits is not required, and burst communication can be realized with a simpler configuration.

A fourth invention is the optical communication device according to the third invention, further comprising a sub optical transmission circuit, wherein the sub optical transmission circuit has the same frequency as a carrier having a frequency unique to each optical transmission circuit. And a carrier generation unit that multiplexes and outputs all reference carrier signals having a fixed phase relationship, and a signal output from the carrier generation unit, which is predetermined in correspondence with n optical receiving circuits. A sub optical modulator for converting the optical signal into a light signal having a predetermined wavelength different from the n different wavelengths and transmitting the converted signal; the optical multiplexing unit includes: a burst optical signal output from each optical transmission circuit; An optical signal output from the optical transmission circuit is multiplexed, and a multiplexed optical signal is output. The wavelength separation unit converts the multiplexed optical signal input from the optical multiplexing unit into n optical reception circuits. An optical signal for each predetermined wavelength and The optical modulator separates the optical signals into optical signals having wavelengths corresponding to the wavelengths of the optical signals to be transmitted, and individually outputs the separated optical signals from n output ports and carrier output ports. A sub-light receiving unit that converts an optical signal output from the carrier output port in the demultiplexing unit into an electric signal and outputs the electric signal, and receives the electric signal output from the sub-optical receiving unit and receives any one of the m reference carrier signals. And a sub-transmission unit that selectively transmits one of the signals and outputs the burst modulation signal. The burst demodulation unit includes a burst modulation signal intermittently output from the transmission unit with reference to the signal output from the sub-transmission unit. Is demodulated.

In the fourth aspect, the carrier signal (unmodulated signal) used in each optical transmission circuit is distributed to each optical receiving circuit as an optical signal of a dedicated wavelength using a newly provided optical transmitting circuit. Then, the signal transmitted from each optical transmission circuit is demodulated based on this signal. Thus, the configuration of the demodulation circuit for the intermittently transmitted modulated signal can be simplified, and large-capacity burst transmission can be realized with a simpler configuration.

A fifth invention is the optical communication apparatus according to the fourth invention, wherein the burst modulation signal is a signal modulated by any one of a frequency modulation method and a phase modulation method.

In the fifth invention, a frequency modulation signal or a phase modulation signal is used as a format of a modulation signal transmitted by each optical transmission circuit. This allows the CNR of the transmission path
(Carrier to noise power ratio) can be improved, and higher quality signal transmission can be realized.

A sixth aspect of the present invention is the optical communication apparatus according to the fifth aspect, wherein the burst demodulation section is configured to intermittently output a burst output from the transmission section with reference to a reference carrier signal output from the sub-transmission section. The modulation signal is synchronously detected.

[0025] In the sixth aspect of the present invention, the modulated signal transmitted by each optical transmission circuit uses a frequency-modulated signal or a phase-modulated signal, and the synchronous detection is performed using a carrier signal transmitted separately from the modulated signal. The demodulation is performed. As a result, higher quality signal transmission can be realized with a simple configuration.

A seventh invention is the optical communication device according to the third invention, wherein the carrier modulation section creates a burst modulation signal using a carrier having a unique frequency different from that of another optical transmission circuit, While outputting intermittently, the carrier signal is output, and each of the optical transmission circuits converts the carrier signal output from the carrier modulation unit into a predetermined number of different n corresponding to the n optical receiving circuits. The optical multiplexing unit further includes a sub-optical modulation unit that converts the optical signal having a predetermined wavelength different from the wavelength into an optical signal and transmits the optical signal. The optical signal from the optical modulation unit is multiplexed, and a multiplexed optical signal is output. The wavelength separation unit determines the multiplexed optical signal input from the optical multiplexing unit in advance corresponding to the n optical receiving circuits. Optical signal and sub-optical modulation for each wavelength There is separated into optical signals of wavelength corresponding to the wavelength of the optical signal to be transmitted, and outputs individually the optical signal separated from the n output ports and carrier output ports,
Each optical receiving circuit converts the optical signal output from the carrier output port in the wavelength separation unit into an electrical signal and outputs the electrical signal, and receives the electrical signal output from the auxiliary optical receiving unit, and receives m output signals. And a sub-transmission unit for selectively transmitting and outputting any one of the reference carrier signals, wherein the burst demodulation unit intermittently transmits from the transmission unit based on the signal output from the sub-transmission unit. And demodulating the burst-modulated signal output to the terminal.

In the seventh aspect of the invention, each optical transmission circuit is newly provided with an optical modulation circuit for transmitting a carrier signal (unmodulated signal), and is distributed to each optical reception circuit as an optical signal of a dedicated wavelength. The signal transmitted from each optical transmission circuit is demodulated based on the signal. As a result, the configuration of the demodulation circuit for the intermittently transmitted modulated signal can be simplified, and burst transmission can be realized with a simpler configuration.

An eighth invention is the optical communication apparatus according to the seventh invention, wherein the burst modulation signal is a signal modulated by one of a frequency modulation method and a phase modulation method.

In the eighth aspect, a frequency modulation signal or a phase modulation signal is used as a format of a modulation signal transmitted by each optical transmission circuit. This allows the CNR of the transmission path
(Carrier to noise power ratio) can be improved, and higher quality signal transmission can be realized.

A ninth invention is the optical communication apparatus according to the eighth invention, wherein the burst demodulation unit intermittently outputs the burst output from the transmission unit with reference to the reference carrier signal output from the sub transmission unit. The modulation signal is synchronously detected.

In the ninth aspect, the modulation signal transmitted by each optical transmission circuit uses a frequency modulation signal or a phase modulation signal as a format, and further performs synchronous detection using a carrier signal transmitted separately from the modulation signal. The demodulation is performed. As a result, higher quality signal transmission can be realized with a simple configuration.

A tenth invention is the optical communication device according to the third invention, and Each optical receiving circuit monitors an electric signal output from the optical receiving unit, determines whether or not there is a burst modulation signal from each optical transmitting circuit, and selects a predetermined burst modulation signal when a burst modulation signal exists. And a monitoring unit that controls the transmission unit so that the transmission unit can output the transmission.

In the tenth aspect, each optical receiving circuit constantly monitors whether a burst modulation signal is transmitted from each optical transmitting circuit. Then, the frequency band in which the transmission section transmits and outputs is controlled in accordance with this. As a result, more efficient burst transmission can be realized.

An eleventh invention is the optical communication apparatus according to the third invention, wherein m transmission units and burst demodulation units are provided in each of the optical receiving circuits, corresponding to the optical transmitting circuits, respectively. Each transmission unit selectively transmits any one of the burst modulation signals from the m optical transmission circuits, which is different from the other transmission units, and outputs the burst modulation signal intermittently. .

In the eleventh aspect, each of the optical receiving circuits includes:
Each of the optical transmission circuits includes m transmission sections and a burst demodulation section corresponding to each of the optical transmission circuits. This allows
Larger capacity burst transmission can be realized.

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 is a block diagram showing a configuration of an optical communication device according to a first embodiment of the present invention. In FIG. 1, the present optical communication device
And two optical transmitting circuits 5101 and 5102, and two receiving circuits of first and second optical receiving circuits 5111 and 5112. With such a configuration, the present optical communication device can realize mutual burst (intermittent) communication between the transmitting circuit and the receiving circuit.

Further, the present optical communication apparatus includes a wavelength traffic management section 503 for managing the wavelengths of the first and second variable wavelength optical modulation sections 5021 and 5022, and a first and second variable wavelength optical modulation section 5021. An optical multiplexing unit 504 that multiplexes the optical signal from the optical signal 5022, an optical transmission line 505 that transmits the optical signal, and a first and second optical receiving circuit 5111 that separates the input optical signal for each wavelength. And a wavelength separation unit 506 for outputting to the 5112.

The first optical transmission circuit 5101 includes a first baseband signal source 5011 for outputting a signal containing data to be transmitted, a first variable wavelength optical modulator 5021 for converting an input signal into an optical signal, and including. Similarly, the second optical transmission circuit 5102 includes a second baseband signal source 5012 that outputs a signal including data to be transmitted, a second variable wavelength optical modulator 5022 that converts an input signal into an optical signal, including. First and second optical receiving circuits 5111 and 511
2 has the same configuration as the conventional optical communication device in FIG.

In the optical communication apparatus configured as described above, the first and second baseband signal sources 5011 and 5012 intermittently output, for example, baseband digital signals. Since the first and second baseband signal sources 5011 and 5012 are merely examples of baseband signal generation sources, for example, baseband digital signals are intermittently input from outside the optical communication apparatus. In such cases, these components are naturally omitted.

First and second variable wavelength light modulators 502
Reference numerals 1 and 5022 include variable wavelength light sources provided corresponding to the first and second baseband signal sources 5011 and 5012, respectively, and capable of changing the wavelength of the optical signal to be output. Only when a corresponding baseband signal source outputs a baseband digital signal, the first and second variable wavelength light modulators 5021 and 5022 modulate the light output from the light source with the corresponding signal. And outputs the first and second burst optical signals intermittently, respectively.

Here, the output light wavelength of the above-mentioned variable wavelength light source included in the first and second variable wavelength light modulating units 5021 and 5022 is a predetermined value for transmitting the burst optical signal to the first optical receiving unit 5071. Is set to the first wavelength λ1 during the period, and is set to the second wavelength λ2 within a predetermined period for transmitting the burst optical signal to the second optical receiving unit 5072.

The optical multiplexer 504 combines the first burst optical signal output from the first variable wavelength optical modulator 5021 and the second burst optical signal output from the second variable wavelength optical modulator 5022. The multiplexed optical signal is transmitted to the optical transmission line 505. The wavelength separation unit 506 and the first
The second optical receiving units 5071 and 5072 have the same configuration and operation as the conventional optical communication device in FIG.

The wavelength traffic management section 503 is configured to control the first burst optical signal output from the first variable wavelength optical modulation section 5021 and the second burst optical signal output from the second variable wavelength optical modulation section 5022. Control is performed so that each wavelength is always different from each other. Such control is performed so that the first and second burst optical signals are not input to the first optical receiving unit 5071 at the same time, or the first and second burst optical signals are input to the second optical receiving unit 5072. This is performed so that two burst optical signals are not input simultaneously.

As described above, in the present optical communication apparatus, a variable wavelength light source is used as a light source for a plurality of optical transmission circuits, a burst-like optical signal is transmitted using the wavelength as address information, and an optical transmission path is used. Above, a wavelength separation unit having an output terminal different according to the wavelength is provided. As a result, it is possible to realize a burst optical communication device that enables spontaneous and high-speed switching of a signal transmission path in the optical domain.

(Second Embodiment) The optical communication device according to the second embodiment is a further improvement of the problem of the optical communication device according to the first embodiment. Therefore, problems of the optical communication device according to the first embodiment will be described first.

Since the optical communication apparatus according to the first embodiment uses a baseband digital signal as a transmission signal, if optical signals from a plurality of optical transmission circuits are simultaneously input to one optical receiving circuit. However, the spectra of the transmission signals overlap each other, making it impossible to reproduce each of them. For this reason, as described above, the wavelength of the burst optical signal from each optical transmission circuit must be managed so as not to be the same wavelength at the same time, that is, always to be different from each other, The system configuration becomes complicated. In addition, when the optical transmission circuits are arranged at locations separated from each other, a new transmission path for exchanging information for controlling the wavelength between the optical transmission circuits is required,
The system configuration is further complicated.

In the optical communication device according to the first embodiment, the wavelength used by one optical transmission circuit is:
Since other optical transmission circuits cannot use that wavelength,
There is a problem that the total traffic capacity that can be handled by the entire optical communication device is limited.

Therefore, there is a demand for a burst optical communication device which can eliminate the need for wavelength management in an optical transmission circuit, and can simultaneously use the same wavelength in a plurality of optical transmission circuits, and can cope with a large capacity. Thus, the configuration and operation of such an optical communication device according to the second embodiment of the present invention will be described with reference to FIG.

In FIG. 2, the optical communication apparatus according to the present embodiment comprises first and second optical transmission circuits 1101 and 110
2 and the first and second optical receiving circuits 1
111 and 1112.

The optical communication apparatus according to the present embodiment includes an optical multiplexing section 104 for multiplexing the light input from the first and second optical transmission circuits 1101 and 1102, and an optical multiplexing section 104 for transmitting the multiplexed light. It further includes a transmission path 105 and a wavelength separation unit 106 that separates light input from the optical transmission path 105.

The first optical transmission circuit 1101 includes a first baseband signal source 1011 for outputting a baseband signal including data to be transmitted, a first carrier modulation section 1021 for modulating the baseband signal, and a first carrier modulation section 1021 for modulating the baseband signal. And a first variable wavelength optical modulator 1031 that converts an electric signal input from the carrier modulator 1021 into an optical signal.

Similarly, the second optical transmission circuit 1102 includes a second baseband signal source 1012 that outputs a baseband signal including data to be transmitted, a second carrier modulation unit 1022 that modulates the baseband signal, , A second variable wavelength optical modulator 1032 that converts an electric signal input from the second carrier modulator 1022 into an optical signal. As described above, the first and second baseband signal sources 1011 and 1012 are omitted when a baseband digital signal is intermittently input from outside the optical communication apparatus.

The first optical receiving circuit 1111 converts an input optical signal into an electric signal.
And a first transmission unit 1081 that transmits only a signal component of a predetermined frequency, and a first burst demodulation unit 1091 that demodulates the transmitted input signal.

Similarly, the second optical receiving circuit 1112 converts the input optical signal into an electric signal.
072, a second transmission unit 1082 that transmits only a signal component of a predetermined frequency, and a second burst demodulation unit 1092 that demodulates the transmitted input signal.

Next, the operation of the optical communication device shown in FIG. 2 will be described. The first and second baseband signal sources 1011 and 1012 each typically output a baseband digital signal (pulse signal) intermittently.

First and second carrier modulating sections 1021
And 1022 are provided corresponding to the first and second baseband signal sources 1011 and 1012, and only when a baseband digital signal is output from the corresponding baseband signal source, a digital modulation signal (for example, 64QAM) is output. Signal, etc.) and output intermittently.

First and second carrier modulation sections 1021
And 1022 are a first frequency f1 and a second frequency f1, which are predetermined different frequencies, respectively.
Two carriers are used respectively.

First and second variable wavelength light modulator 103
Reference numerals 1 and 1032 include light sources provided corresponding to the first and second carrier modulation units 1021 and 1022, respectively, and capable of changing the wavelength of output light.

First and second variable wavelength light modulator 103
1 and 1032 modulate the light output from the corresponding light source with the corresponding digital modulation signal only when the digital modulation signal is output from the corresponding carrier modulation section, and respectively perform the first and second bursts. Outputs an optical signal.

FIGS. 3A and 3B show the first burst optical signal output from the first variable wavelength optical modulator 1031 and the second burst optical signal output from the second variable wavelength optical modulator 1032. 2 schematically shows a configuration of a burst optical signal of No. 2; In the figure, λ1 and λ2 indicate the wavelength of the output light, and parenthesized (f1) and (f2) indicate the carrier frequency of the digital modulation signal.

The optical multiplexing section 104 multiplexes the first burst optical signal from the first variable wavelength optical modulation section 1031 and the second burst optical signal from the second variable wavelength optical modulation section 1032. The waved optical signal is transmitted to the optical transmission line 105.

The wavelength separating section 106 is composed of the above-mentioned AWG or the like, and has two output ports. A predetermined first wavelength (λ) included in the optical signal transmitted through the optical transmission line 105
1) The component is output from the first output port, and the predetermined second wavelength (λ2) component is output from the second output port. Of course, the first and second burst optical signals are:
Since both are output intermittently, the transmitted optical signal does not necessarily include the first wavelength (λ1) component and the second wavelength (λ2) component.

FIGS. 3 (c) and 3 (d) show the configurations of the optical signal from the first output port and the optical signal from the second output port of the wavelength separation section 106, respectively, at the wavelength and the carrier frequency. , And schematically shown.

The first optical receiving section 1071 includes the wavelength separating section 1
06, and the second optical receiver 1072 is connected to the second output port. First
The optical receiving unit 1071 of the first
Of the first wavelength (λ
The optical signal having 1) is input, converted into an electric signal, and output intermittently. The second optical receiving unit 1072 includes:
An optical signal having the second wavelength (λ2) output intermittently from the second output port of the wavelength separation unit 106 is input, converted into an electric signal, and output intermittently.

First and second transmission parts 1081 and 1
082 denotes the first and second optical receiving units 1071 and 1071.
072, and transmits and outputs only a signal component having a predetermined frequency included in the electric signal output from the corresponding optical receiving unit.

First and second burst demodulators 1091
And 1092 are provided corresponding to the first and second transmission units 1081 and 1082, and receive the digitally modulated signals intermittently output from the corresponding transmission units.
This is demodulated into a baseband digital signal and output.

Here, the operation of the first and second variable wavelength light modulators 1031 and 1032 will be described in more detail. First and second variable wavelength optical modulator 103
1 and 1032 are the first to which the signal is to be transmitted
Alternatively, the wavelength of the output optical signal is controlled according to the second optical receiving circuit 1111 or 1112.

That is, the first and second variable wavelength optical modulators 1031 and 1032 are provided with the first optical receiving circuit 11.
When an optical signal is to be transmitted to 11, the wavelength of the output optical signal is set to λ1. Also, the second optical receiving circuit 11
In the case of transmitting an optical signal to 12, the wavelength of the output optical signal is set to λ2.

By the operations of the first and second variable wavelength optical modulators 1031 and 1032, the wavelength separation unit 106 performs the spontaneous optical signal path selection as described above. Therefore, only the optical signal having the wavelength λ1 is distributed to the first optical receiving unit 1071, and only the optical signal having the wavelength λ2 is distributed to the second optical receiving unit 1072.

Next, the operation of the first and second transmission sections 1081 and 1082 will be described in more detail.
The first and second transmission units 1081 and 1082 control the transmission frequency according to the first or second optical transmission circuit 1101 or 1102 that is to receive a signal, respectively.

That is, the first and second transmission sections 108
1 and 1082 set the transmission frequency to f1 when trying to receive a signal from the first optical transmission circuit 1101. Further, when trying to receive a signal from the second optical transmission circuit 1102, the transmission frequency is set to f2. Typically, the first and second transmission units 1081 and 1082 are connected to the first optical transmission circuit 1 every predetermined period.
Switching between a case where a signal is to be received from 101 and a case where a signal is to be received from the second optical transmission circuit 1102 is switched.

The first and second transmission portions 108 are configured as described above.
1 and 1082, the first and second optical transmission circuits 1101 and 1101
02 can be separated and selected even when signals are simultaneously input from both of them.

The first and second optical transmission circuits 110
Consider a case where a burst optical signal is transmitted from 1 and 1102 to one optical receiving circuit, for example, a first optical receiving circuit 1111 at the same time. In such a case, the first
First transmission unit 1081 included in the optical reception circuit 1111 of FIG.
Selects a digital modulation signal, for example, a digital modulation signal output from the first optical transmission circuit 1101, and the first burst demodulation unit 1091 demodulates it. As a result, the first optical transmission circuit 1101 and the first
Communication with the optical receiving circuit 1111 is established.

Therefore, the other digital modulation signal discarded without being selected by the first transmission unit 1081, that is, the digital modulation signal output from the second optical transmission circuit 1102 is not transmitted. Therefore, communication between the second optical transmitting circuit 1102 and the first optical receiving circuit 1111 is not established.

In such a case, the second optical transmission circuit 1
The 102 receives the notification from the first optical receiving circuit 1111 sent via a transmission path (not shown) or voluntarily retransmits the discarded digital modulation signal. With such an operation, communication between the second optical transmission circuit 1102 and the first optical reception circuit 1111 can be established.

As described above, according to the present embodiment, an individual carrier frequency is assigned to each of the plurality of optical transmission circuits, and the transmission in the optical reception circuit is performed according to the optical transmission circuit to receive information. Variable control of the frequency. Accordingly, even when optical signals from a plurality of optical transmission circuits are simultaneously input to one receiving circuit,
Enables easy separation and extraction of information. According to the present embodiment, complicated wavelength management between optical transmission circuits is not required. This makes it possible to easily realize a burst optical communication device that performs high-speed and large-capacity optical information transmission and exchange based on optical signal processing.

(Third Embodiment) Next, the configuration of an optical communication device according to a third embodiment of the present invention will be described with reference to FIG. In FIG. 4, the optical communication device according to the present embodiment includes:
The circuit includes two transmission circuits of first and second optical transmission circuits 1101 and 1102, a sub optical transmission circuit 3103, and two reception circuits of first and second optical reception circuits 3111 and 3112.

Further, the optical communication device of the present embodiment
And an optical multiplexing section 304 for multiplexing light input from the second optical transmission circuits 1101 and 1102 and the sub optical transmission circuit 3103, and an optical transmission line 105 for transmitting the multiplexed light.
And a wavelength separation unit 306 that separates light input from the optical transmission line 105.

The two transmission circuits of the first and second optical transmission circuits 1101 and 1102 in the optical communication apparatus according to the present embodiment have the same configuration as the two transmission circuits in the optical communication apparatus according to the second embodiment. Therefore, the description is omitted.

The sub optical transmission circuit 3103 includes the first and second
Carrier generator 3010 that simultaneously outputs a signal having the same frequency as the carrier used to generate the respective modulated signals output from carrier modulators 1021 and 1022
And a sub-light modulation unit 3011 that converts an electric signal input from the carrier generation unit 3010 into an optical signal.

The first optical receiving circuit 3111 transmits a first optical receiving unit 1071 and a first auxiliary optical receiving unit 30121 for converting an input optical signal into an electric signal, and transmits only a signal component of a predetermined frequency. A first burst demodulation for demodulating an input signal from the first transmission unit 1081 and the first sub transmission unit 30131 using an input signal from the first sub transmission unit 30131 Unit 3091.

Similarly, the second optical receiving circuit 3112 converts the input optical signal into an electric signal.
072 and the second sub-light receiving unit 30122 and a second transmitting unit 1082 that transmits only a signal component of a predetermined frequency.
And the second sub-transmission portion 30132 and the second transmission portion 10
The second burst demodulation unit 30 that demodulates the input signal from the second input unit 82 using the input signal from the second sub-transmission unit 30132
92.

Next, the operation of the optical communication apparatus of the present embodiment shown in FIG. 4 will be described. Since the device configuration of the present embodiment conforms to the device configuration of the above-described second embodiment,
The description of the common points in the operation will be omitted, and the following description will focus on the differences.

The carrier generation section 3010 is provided in the first and second carrier modulation sections 1021 and 1022.
A signal having the same frequency as all the carrier signals used to generate the digital modulation signal and having a fixed phase relationship, that is, carrier signals of frequencies f1 and f2 are multiplexed and output.

The sub light modulator 3011 has a light source for outputting light of a predetermined third wavelength (λc).
The carrier signals of frequencies f1 and f2 output from 010 are converted into optical signals and output. The output signal is not an intermittent burst optical signal but a continuous optical signal.

The optical multiplexing section 304 includes a first burst optical signal output from the first variable wavelength optical modulation section 1031 and a second burst optical signal output from the second variable wavelength optical modulation section 1032. , And all the optical signals output from the sub optical modulation unit 3011 are multiplexed, and the multiplexed optical signal is
05.

The wavelength separation unit 306 is composed of an AWG or the like, has three output ports, and has a predetermined first wavelength (λ) included in the optical signal transmitted through the optical transmission line 105.
1) A component is output from a first output port, and a predetermined second wavelength (λ2) component is output from a second output port. Of course, since the first and second burst optical signals are both output intermittently, the transmitted optical signal includes a predetermined first wavelength (λ1) component and a second wavelength (λ1). λ2) component is not always included. Further, the wavelength separation unit 306 outputs a predetermined third wavelength (λc) component always included in the transmitted optical signal from the third output port.

The first and second sub optical receiving units 30121 and 30122 are connected to the third output port of the wavelength separating unit 306, respectively, and receive the optical signal having the third wavelength (λc). Is converted into an electric signal and output.

The first and second sub-transmission units 30131 and 30132 are provided with first and second sub-light reception units 3012.
1 and 30122, among the electric signals output from the corresponding auxiliary optical receivers, a predetermined frequency f
Only the carrier signal of either 1 or f2 is transmitted and output.

First and second burst demodulators 3091
And 3092 demodulate the digital modulation signal output intermittently from the corresponding transmission unit into a baseband digital signal based on the carrier signal output from the corresponding sub-transmission unit and output it.

Here, the first and second sub-transmission parts 301
The operations of 31 and 30132 will be described in more detail. First and second sub-transmission portions 30131 and 3
0132 is the first and second transmission parts 1081 and 1
Similarly to 082, the transmission frequency is controlled according to the optical transmission circuit to be received.

That is, the first and second sub-transmission portions 30
131 and 30132 are first optical transmission circuits 1101
When receiving the signal from, the transmission frequency is set to f1 together with the corresponding transmission unit. When a signal from the second optical transmission circuit 1102 is to be received, the transmission frequency is set to f2 together with the corresponding transmission unit. With such an operation, the first and second sub-transmission units 30131 and 30132 supply the corresponding burst demodulation unit with the intermittently input digital modulation signal and the continuously input carrier signal. By doing so, the demodulation can be performed more simply and quickly.

This demodulation operation will be described in more detail. In the case where the device configuration as in the present embodiment is not used, the carrier signal necessary for demodulating the digital modulation signal is usually supplied by an oscillation circuit built in the burst demodulation unit, for example, a PLL circuit. However, since the digital modulation signal to be demodulated is input only intermittently, the frequency and phase of the carrier signal generated by the PLL circuit are shifted while the modulation signal is not input. Therefore, when a modulation signal is input, PL
The frequency and phase of the carrier signal generated by the L circuit need to be readjusted accurately.

However, since intermittently input digital modulation signals are often very short signals, it is often not possible to take sufficient time necessary to readjust the frequency and phase. Further, even in such a case, an apparatus configuration that enables readjustment becomes very complicated.

Therefore, according to the configuration of the present embodiment in which the same signal as the carrier signal is continuously supplied to the burst demodulation unit, the demodulation of the digital modulation signal which is input only intermittently can be simplified. It can be performed instantaneously with a simple configuration.

As described above, according to the present embodiment, a signal similar to a carrier signal used for generating a digital modulation signal in each optical transmission circuit is continuously distributed to each optical reception circuit. . Thus, it is possible to realize a burst optical communication device that can demodulate the intermittently transmitted digital modulation signal more easily and quickly.

(Fourth Embodiment) Next, the configuration of an optical communication device according to a fourth embodiment of the present invention will be described with reference to FIG. In FIG. 5, the optical communication device according to the present embodiment includes:
Two transmission circuits, ie, first and second optical transmission circuits 4101 and 4102, and first and second optical reception circuits 311
1 and 3112.

Further, the optical communication device of the present embodiment has the first
And an optical multiplexing unit 4 for multiplexing two optical signals output from the second optical transmission circuits 4101 and 4102, respectively.
04 and an optical transmission line 105 for transmitting the multiplexed optical signal.
And a wavelength separation unit 306 that separates light input from the optical transmission line 105.

The first optical transmission circuit 4101 includes a first baseband signal source 1011 for outputting a baseband signal including data to be transmitted, a first carrier modulation section 4021 for modulating the baseband signal, and a first A first variable wavelength optical modulator 1031 and a first sub-optical modulator 40111 that convert an electric signal input from the carrier modulator 4021 into an optical signal.

Similarly, the second optical transmission circuit 4102 includes a second baseband signal source 1012 for outputting a baseband signal containing data to be transmitted, a second carrier modulation section 4022 for modulating the baseband signal, , A second variable wavelength optical modulator 1032 and a second sub-optical modulator 40112 that convert an electric signal input from the second carrier modulator 4022 into an optical signal.

Note that, in the optical communication device of the present embodiment,
Since the two receiving circuits of the first and second optical receiving circuits 3111 and 3112 have the same configuration as the two receiving circuits in the optical communication device of the third embodiment described above, the description is omitted. As described above, the first and second baseband signal sources 1011 and 1012 can be omitted.

Next, the operation of the fourth embodiment shown in FIG. 5 will be described. Since the configuration of the present embodiment conforms to the above-described third embodiment, the description of the common points in the operation will be omitted, and the following description will focus on the differences.

First and second carrier modulation sections 4021
And 4022 are provided corresponding to the first and second baseband signal sources 1011 and 1012, respectively, and convert the digital modulation signal using a carrier having a predetermined first frequency f1 and a second frequency f2 different from each other. It outputs intermittently and outputs a non-modulated carrier signal.

The first and second sub-light modulation sections 40111 and 40112 are provided with the first and second carrier modulation sections 4111 and 40112, respectively.
021 and 4022, and both have a light source that outputs light of a predetermined third wavelength (λc). First
And second sub-light modulators 40111 and 40112
Converts the carrier signal output from the corresponding first and second carrier modulation sections 4021 and 4022 into an optical signal and outputs the optical signal.

The optical multiplexing unit 404 outputs the two signals output from the first and second tunable wavelength optical modulators 1031 and 1032.
Burst optical signals and first and second sub-optical modulators 4
All the two optical signals output from 0111 and 40112 are multiplexed, and the multiplexed optical signal is
Send to.

The operation on the receiving side in the present embodiment is the third
This is the same as the embodiment. However, the carrier signals input from the first and second sub-transmission units 30131 and 30132 to the first and second burst demodulation units 3091 and 3092 are different from those of the optical communication device according to the third embodiment. It has the correct frequency and phase.

That is, in the optical communication apparatus according to the third embodiment, the signal output from the carrier generation section 3010 included in the sub optical transmission circuit 3103 and the signal output from the first and second carrier modulation sections 1021 and 1022 Is
Since the respective sources are different, there is a high possibility that a slight frequency and phase shift occurs between the signals.
On the other hand, in the optical communication device of the present embodiment, the first and second burst demodulation units 3091 and 3092
Are generated from the first and second carrier modulation sections 4021 and 4022, and have exactly the same frequency and phase.

Therefore, the optical communication device according to the present embodiment can perform more accurate demodulation, although the configuration is slightly more complicated than that of the optical communication device according to the third embodiment.

As described above, according to the present embodiment, a carrier signal used for generating a digital modulation signal in each optical transmitting circuit is extracted and distributed to each optical receiving circuit. Thus, it is possible to realize a burst optical communication device that can more easily and accurately demodulate a digitally modulated signal intermittently transmitted.

Note that the optical communication device in the present embodiment is:
First and second carrier modulation sections 4021 and 402
And first and second sub-light modulators 40111 and 40112 to which the carrier signals from the second and the second subcarriers are respectively inputted.
However, the optical communication apparatus according to the present embodiment includes a carrier combining unit that receives carrier wave signals from the first and second carrier modulating units 4021 and 4022 and combines the signals, and a signal from the carrier combining unit. May be provided with a single sub-light modulator. According to such a configuration, as in the optical communication device according to the third embodiment, the number of sub-light modulation units can be reduced to one, so that more accurate demodulation can be performed with a simple configuration. .

(Fifth Embodiment) Next, an optical communication device according to a fifth embodiment of the present invention will be described with reference to FIG. In FIG. 6, the optical communication device according to the present embodiment includes:
First and second optical transmission circuits 1101 and 1102
And first and second optical receiving circuits 1111 and 111
2 is provided.

Further, the optical communication device according to the present embodiment has the first
And an optical multiplexing unit 104 for multiplexing optical signals input from the second optical transmission circuits 1101 and 1102, an optical transmission line 105 for transmitting the multiplexed optical signal, and an optical transmission line 105
And a wavelength separation unit 106 that separates the optical signal input from the.

Since the two transmission circuits of the first and second optical transmission circuits 1101 and 1102 have the same configuration as the two transmission circuits in the optical communication device of the second embodiment, the description will be omitted.

The first optical receiving circuit 1111 converts the input optical signal into an electric signal.
A first transmitting unit 1081 that transmits only a signal component having a predetermined frequency, and a first monitoring unit that monitors a signal input from the first optical receiving unit 1071 and controls the first transmitting unit 1081. Unit 11001 and a first burst demodulation unit 1091 for demodulating the transmitted input signal.

Similarly, the second optical receiving circuit 1112 converts the input optical signal into an electric signal.
072, a second transmitting unit 1082 that transmits only a signal component having a predetermined frequency, and a second optical receiving unit 1072
And a second burst demodulation unit 1092 for monitoring the signal input from the second unit and controlling the second transmission unit 1082 and demodulating the transmitted input signal.

Next, the operation of the optical communication apparatus shown in FIG. 6 will be described. Since the configuration of the optical communication device according to the present embodiment conforms to the configuration of the optical communication device according to the above-described second embodiment, description of common points in operation will be omitted, and differences will be mainly described below.

The first and second monitoring units 11001 and 11002 are respectively connected to the first optical receiving unit 1071 and the first transmitting unit 1081 and the second optical receiving unit 1072 and the second transmitting unit 1082. It is provided correspondingly and constantly monitors the electrical signal output from the corresponding optical receiver. First and second monitoring units 11001 and 1100
2 is a first digitally modulated signal having a carrier frequency f1 or a frequency f1 in the monitored electrical signal.
When a second digital modulation signal having two carrier waves is detected, the transmission unit is controlled so as to transmit and output any of the digital modulation signals.

For example, the first and second monitoring units 110
01 and 11002 constantly monitor the electric signal output from the corresponding optical receiving unit, and
When the reception of the optical signal from the first signal is detected, the frequency f1
The corresponding transmission unit is controlled so as to transmit and output the first digital modulation signal having the carrier wave of. When detecting the reception of the optical signal from the second optical transmission circuit 1102, the first and second monitoring units 11001 and 1100
2 controls the corresponding transmission unit so as to transmit and output the second digital modulation signal having the carrier of the frequency f2. As described above, the operations of the first and second monitoring units 11001 and 11002 enable reception of an optical signal flexibly corresponding to the optical signal input to the optical receiving unit.

The operation of the first and second transmission sections 1081 and 1082 allows the first and second optical transmission circuits 1101 and 1101 to be connected to one optical reception circuit.
Even if signals are input from both of the two at the same time,
The separation and selection are possible as in the case of the optical communication device according to the second embodiment.

As described above, the above-described configuration and operation of the optical communication device according to the present embodiment are obtained by making certain changes to the configuration and operation of the optical communication device according to the second embodiment. . Such a change in the present optical communication device can be similarly applied to the optical communication devices according to the third and fourth embodiments described above.

As described above, according to the present embodiment, in the optical receiving circuit, the digital modulation signal output intermittently from each optical transmitting circuit is monitored, and the transmission unit is controlled correspondingly. Thus, a more efficient burst optical communication device can be realized.

(Sixth Embodiment) Next, an optical communication device according to a sixth embodiment of the present invention will be described below with reference to FIG. In FIG. 7, the optical communication device according to the present embodiment includes first and second optical transmission circuits 1101 and 1102, and first and second optical reception circuits 1111 and 1112.

Further, the optical communication device according to the present embodiment has the first
And an optical multiplexing unit 104 for multiplexing optical signals input from the second optical transmission circuits 1101 and 1102, an optical transmission line 105 for transmitting the multiplexed optical signal, and an optical transmission line 105
And a wavelength separation unit 106 that separates the optical signal input from the.

Since the two transmission circuits of the first and second optical transmission circuits 1101 and 1102 have the same configuration as the two transmission circuits in the optical communication device of the second embodiment, the description will be omitted.

The first optical receiving circuit 1111 converts the input optical signal into an electric signal.
And two first transmission units 10811 and 10812 that transmit only signal components having predetermined frequencies different from each other.
And two first demodulators respectively demodulating the transmitted input signal.
And burst demodulation units 10911 and 10912.

Similarly, the second optical receiving circuit 1112 converts the input optical signal into an electric signal.
072 and two second transmission units 10821 and 10821 that transmit only signal components having predetermined frequencies different from each other.
22 and two second burst demodulators 10921 and 10922 for demodulating the transmitted input signal.

Next, the operation of the optical communication device will be described with reference to FIG. Since the configuration of the optical communication device according to the present embodiment conforms to the configuration of the optical communication device according to the above-described second embodiment, description of common points in operation will be omitted, and the following description will focus on differences.

In the first optical receiving circuit 1111, one of the two transmitting sections, the first transmitting section 10811 transmits the first digital modulation signal having the carrier of the frequency f 1. The transmitted signal is transmitted to the first burst demodulation unit 1
0911 is demodulated. Further, the other first transmission unit 10812 transmits the second digital modulation signal having the carrier wave of the frequency f2. The transmitted signal is the first
Is demodulated by the burst demodulation unit 10912 of the.

Similarly, in the second optical receiving circuit 1112, one of the two transmitting sections, the second transmitting section 108
21 transmits the first digital modulation signal having a carrier of frequency f1. The transmitted signal is demodulated by the second burst demodulator 10921. Further, the other second transmission section 10822 transmits the second digital modulation signal having the carrier wave of frequency f2. The transmitted signal is demodulated by second burst demodulation section 10922.

Therefore, in the first and second optical receiving circuits 1111 and 1112, demodulated signals corresponding to the signals from the first and second optical transmitting circuits 1101 and 1102 are output from the two demodulating units, respectively. Is done. With such a configuration, the first and second optical transmission circuits 1101 and 1101 are provided for one optical reception circuit.
Even if signals are simultaneously input from both of these terminals, these signals can be demodulated together without making these selections.

As described above, the above-described configuration and operation of the optical communication device of the present embodiment are modified from the configuration and operation of the optical communication device of the second embodiment by a certain amount. Such a change in the present embodiment can be similarly applied to the optical communication devices according to the above-described third and fourth embodiments.

As described above, according to the present invention, in the optical receiving circuit, a transmission unit and a digital demodulation unit corresponding to the number of optical transmission circuits are prepared, thereby realizing a burst optical communication device with a larger capacity. can do.

In the above embodiment, the operation has been described based on the configuration in which communication is performed between two optical transmission circuits and two optical reception circuits. However, the number of optical transmitting circuits and optical receiving circuits is not limited to two, and may be larger. Further, the numbers of the optical transmitting circuits and the optical receiving circuits do not necessarily have to be equal to each other.

In the above case, the predetermined carrier frequency used for generating the digital modulation signal in each optical transmission circuit is different from each other, and the carrier frequency is unique to each optical transmission circuit. Corresponding to

Further, the wavelength of the optical signal transmitted by each optical transmission circuit differs according to each optical receiving circuit, and the wavelength uniquely corresponds to each optical receiving circuit. Thereby, the transmitting side can select the receiving side by the wavelength, and the receiving side can select the transmitting side by the carrier frequency.

In all the embodiments described above, the first
The digital modulation signal used in the second carrier modulation section may be any type of signal. Here, frequency modulation or phase modulation is performed by using C
It is known that it is very advantageous as a modulation format for improving NR (carrier to noise power ratio), but complicated signal processing must be performed to demodulate a modulated signal.

However, in the third and fourth embodiments described above, a signal identical or similar to the carrier signal used when generating the modulated signal is supplied to the burst demodulation unit of the optical receiving circuit. it can. For this reason, according to a technique such as synchronous detection of the modulation signal based on the supplied signal, the demodulation processing can be easily performed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an optical communication device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of an optical communication device according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram for explaining a relationship between a carrier frequency of a transmission signal and an optical wavelength in an optical communication device according to a second embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of an optical communication device according to a third embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of an optical communication device according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration of an optical communication device according to a fifth embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of an optical communication device according to a sixth embodiment of the present invention.

FIG. 8 is a block diagram illustrating a configuration of a conventional optical communication device.

[Explanation of symbols]

 1011 1st baseband signal source 1012 2nd baseband signal source 1021 1st carrier modulation section 1022 2nd carrier modulation section 1031 1st variable wavelength light modulation section 1032 2nd variable wavelength light modulation section 104 Wave section 105 Optical transmission path 106 Wavelength separation section 1071 First optical reception section 1072 Second optical reception section 1081 First transmission section 10811 First transmission section 10812 First transmission section 1082 Second transmission section 10821 2 transmission section 10822 second transmission section 1091 first burst demodulation section 10911 first burst demodulation section 10912 first burst demodulation section 1092 second burst demodulation section 10921 second burst demodulation section 10922 second burst Demodulation unit 11001 First monitoring unit 11002 Second monitoring unit 1101 First light Communication circuit 1102 Second optical transmission circuit 1111 First optical reception circuit 1112 Second optical reception circuit 3091 First burst demodulation unit 3092 Second burst demodulation unit 304 Optical multiplexing unit 306 Wavelength separation unit 3091 First burst Demodulation unit 3092 second burst demodulation unit 3010 carrier generation unit 3011 sub-light modulation unit 30121 first sub-light reception unit 30122 second sub-light reception unit 30131 first sub-transmission unit 30132 second sub-transmission unit 3103 sub Optical transmission circuit 3111 First optical reception circuit 3112 Second optical reception circuit 4021 First carrier modulation section 4022 Second carrier modulation section 404 Optical multiplexing section 40111 First auxiliary light modulation section 40112 Second auxiliary light modulation Unit 4101 first optical transmission circuit 4102 second optical transmission circuit 5011 first baseband signal source Reference numeral 5012: a second baseband signal source 5021: a first variable wavelength optical modulator 5022: a second variable wavelength optical modulator 503: a wavelength traffic manager 504: an optical multiplexer 505: an optical transmission line 506: a wavelength separator 5071: a first optical receiver 5072 2nd optical receiving part 5101 1st optical transmitting circuit 5102 2nd optical transmitting circuit 5111 1st optical receiving circuit 5112 2nd optical receiving circuit

Claims (11)

[Claims] 1. An optical communication apparatus for transmitting an intermittent optical signal from a transmitting side to a receiving side using wavelength information of an optical signal as an address, wherein m transmitting intermittent optical signals (however, m is a natural number of 2 or more), n optical receiving circuits (where n is a natural number of 2 or more) for receiving an optical signal from each of the optical transmitting circuits, An optical transmission circuit for interconnecting a transmission circuit and each of the optical reception circuits, wherein each of the optical transmission circuits is configured such that a burst optical signal output from an input intermittent signal as an original signal does not collide with each other. The optical transmission circuit multiplexes the burst optical signals output from each of the optical transmission circuits, and for each predetermined wavelength corresponding to the n optical reception circuits. Separate into optical signals, and separate the separated optical signals from n output ports. Another manner is output, each of said light receiving circuit, and outputs intermittently converts the optical signal output from the output port corresponding to the electrical signal, an optical communication device. 2. The optical transmission circuit further includes a wavelength traffic management unit, wherein each of the optical transmission circuits converts an input intermittent signal into a burst optical signal, and outputs an output optical wavelength corresponding to the n optical reception circuits. A variable wavelength optical modulator including a variable wavelength optical modulator configured to set any one of the predetermined n different wavelengths and intermittently transmitting the burst optical signal, wherein the wavelength traffic management unit includes: The optical transmission circuit controls the wavelengths of the burst optical signals to be transmitted so that they do not coincide with each other, and the optical transmission circuit multiplexes the burst optical signals output from the respective optical transmission circuits and outputs a multiplexed optical signal Unit, and separates the multiplexed optical signal input from the optical multiplexing unit into optical signals of predetermined wavelengths corresponding to the n optical receiving circuits, and separates the separated optical signals into n optical signals. Output individually from output ports And a wavelength separator, each of said light receiving circuit converts the optical signal output from the output ports corresponding in the wavelength separator into an electric signal,
The optical communication device according to claim 1, further comprising an optical receiving unit that outputs intermittently. 3. Each of the optical transmission circuits generates a burst modulation signal using a carrier having a unique frequency different from that of another optical transmission circuit, using the input intermittent signal as an original signal, and A carrier modulation unit that outputs a burst modulation signal from the carrier modulation unit to a burst optical signal, and outputs n output wavelengths corresponding to n different wavelengths predetermined for the n optical receiving circuits. And a variable wavelength optical modulator for intermittently transmitting the burst optical signal, wherein the optical transmission circuit multiplexes the burst optical signals output from the optical transmission circuits. An optical multiplexing unit that outputs a multiplexed optical signal, and separates the multiplexed optical signal input from the optical multiplexing unit into optical signals for each predetermined wavelength corresponding to the n optical receiving circuits. Output n separated optical signals A wavelength separating unit that individually outputs the signals from a port, each of the optical receiving circuits converts an optical signal output from a corresponding output port in the wavelength separating unit into an electric signal, and outputs the light intermittently. A receiving unit, receiving an electric signal intermittently output from the optical receiving unit,
a transmission unit that selectively transmits any one of the burst modulation signals from the m optical transmission circuits and outputs the burst modulation signal intermittently; and a burst that demodulates the burst modulation signal output intermittently from the transmission unit. The optical communication device according to claim 1, further comprising a demodulation unit. 4. A sub-optical transmission circuit, wherein the sub-optical transmission circuit has the same frequency as a carrier having a frequency unique to each of the optical transmission circuits, and has a fixed phase relationship. And a signal generating unit that multiplexes and outputs the signals, and outputs a signal output from the carrier generating unit to a predetermined number of different n corresponding to the n optical receiving circuits.
And a sub-optical modulation unit that converts and transmits an optical signal having a predetermined wavelength different from the plurality of wavelengths, the optical multiplexing unit includes a burst optical signal output from each of the optical transmission circuits, and further includes: Multiplexes the optical signal output from the sub optical transmission circuit to output a multiplexed optical signal; and the wavelength separation unit converts the multiplexed optical signal input from the optical multiplexing unit into n optical reception circuits. The optical signal is separated into an optical signal for each predetermined wavelength and an optical signal having a wavelength corresponding to the wavelength of the optical signal transmitted by the sub optical modulator, and the separated optical signals are output to n output ports. And an optical output circuit individually output from a carrier output port, wherein each of the optical receiving circuits converts an optical signal output from the carrier output port in the wavelength separation unit into an electrical signal and outputs the electrical signal; Receiving the electric signal output from the receiving unit, And a sub-transmission unit that selectively transmits and outputs any one of the reference carrier signals. The burst demodulation unit uses the signal output from the sub-transmission unit as a reference. 4. A demodulator for demodulating a burst modulation signal output intermittently from the transmission unit.
The optical communication device according to item 1. 5. The optical communication device according to claim 4, wherein the burst modulation signal is a signal modulated by one of a frequency modulation method and a phase modulation method. 6. The burst demodulation unit synchronously detects a burst modulation signal output intermittently from the transmission unit with reference to a reference carrier signal output from the sub transmission unit. Item 6. The optical communication device according to item 5. 7. The carrier modulation section generates a burst modulation signal using a carrier having a unique frequency different from that of another optical transmission circuit, outputs the burst modulation signal intermittently, and outputs the carrier signal. The optical transmission circuit converts the carrier signal output from the carrier modulation unit into an optical signal having a predetermined wavelength different from the n different wavelengths that are predetermined in correspondence with the n optical reception circuits. The optical multiplexing unit further includes a sub optical modulation unit that converts and transmits the burst optical signal from the variable wavelength optical modulation unit included in each of the optical transmission circuits, and an optical signal from the sub optical modulation unit. And outputs a multiplexed optical signal. The wavelength separation unit converts the multiplexed optical signal input from the optical multiplexing unit into a predetermined wavelength corresponding to the n optical receiving circuits. Optical signal for each and the sub-light modulator Separates the optical signals into optical signals having wavelengths corresponding to the wavelengths of the optical signals to be transmitted, and individually outputs the separated optical signals from n output ports and carrier output ports. A sub-light receiving unit that converts an optical signal output from a carrier output port in the unit to an electric signal and outputs the electric signal, receives the electric signal output from the sub-light receiving unit, and receives the electric signal from the m reference carrier signals. And a sub-transmission unit that selectively transmits one of the sub-transmission units and outputs the intermittent output signal. The burst demodulation unit is intermittently output from the transmission unit with reference to a signal output from the sub-transmission unit. And demodulating the burst modulated signal.
The optical communication device according to item 1. 8. The optical communication device according to claim 7, wherein the burst modulation signal is a signal modulated by one of a frequency modulation method and a phase modulation method. 9. The burst demodulation unit synchronously detects a burst modulation signal output intermittently from the transmission unit with reference to a reference carrier signal output from the sub transmission unit. Item 10. The optical communication device according to item 8. 10. Each of the optical receiving circuits monitors an electric signal output from the optical receiving unit to determine the presence or absence of a burst modulation signal from each of the optical transmission circuits. 4. The optical communication apparatus according to claim 3, further comprising a monitoring unit that controls the transmission unit so as to selectively transmit and output a predetermined burst modulation signal. 11. The transmission unit and the burst demodulation unit are each provided with m optical transmission circuits corresponding to each of the optical transmission circuits, and each of the transmission units includes m optical transmission circuits. 4. The optical communication device according to claim 3, wherein any one of the burst modulation signals from the first and second transmission units, which is different from the other transmission units, is selectively transmitted and output intermittently.