JP2009278595A - Optical wavelength multiplexed transmission system and optical amplifier control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce optical signal quality deterioration caused by a transient response of an optical amplifier due to optical signal switching while transmitting a supervisory and control signal, in an optical wavelength multiplexed transmission system which connects an optical cross-connect device to an optical fiber transmission line including the optical amplifier and switches a transmission destination of optical signal. <P>SOLUTION: A supervisory and control signal transmitter is provided which generates a supervisory and control signal to be wavelength-multiplexed on a wavelength multiplex optical signal to be sent from an output port of an optical switch to an optical fiber transmission line. When the number of wavelength multiplexing of the wavelength multiplex optical signal to be sent to the optical fiber transmission line is increased/decreased, the supervisory and control signal transmitter switches a wavelength of the supervisory and control signal so as to switch between the increased/decreased wavelength and a wavelength other than an optical amplification band of the optical amplifier, and suppresses variation in the total optical power in the optical amplification band to be input to the optical amplifier of the optical fiber transmission line. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical wavelength multiplex transmission system including an optical cross-connect device and an optical amplifier, and an optical wavelength for mitigating a transient response of the optical amplifier due to a variation in the number of multiplexed wavelengths accompanying switching of the optical cross-connect device using a supervisory control signal. The present invention relates to a multiplex transmission system and an optical amplifier control method.

  In general, an optical wavelength division multiplexing transmission system includes monitoring control signal transmission means for monitoring the state of the optical amplification repeater in addition to means for transmitting the wavelength-multiplexed main signal.

  FIG. 10 shows a configuration example of an optical wavelength division multiplex transmission system including a supervisory control signal transmission means. Here, a configuration example is shown in which a wavelength division multiplexed main signal and a supervisory control signal are transmitted between terminal devices connected via an optical fiber transmission line and an optical amplification repeater.

  In the figure, one terminal apparatus 100 wavelength-multiplexes the main signal output from a plurality of main signal transmitters 101 by a multiplexer 102, and supervises the control signal transmitter 104 by an optical coupler 103 to the wavelength multiplexed main signal. The monitoring control signal output from the signal is wavelength-multiplexed and sent to the optical fiber transmission line 105. An optical amplification repeater 107 including an optical amplifier 106 is inserted into the optical fiber transmission line 105. The optical amplification repeater 107 amplifies the wavelength multiplexed main signal by the optical amplifier 106 and transmits it to the next stage, and inputs the wavelength multiplexed optical signal branched via the optical coupler 108 to the monitoring control signal receiver 109 for monitoring. A control signal is detected and notified to the monitoring control circuit 110. The supervisory control circuit 110 processes the supervisory control signal from the previous stage, generates information such as the state of the optical amplification repeater 107 transmitted to the subsequent stage, and transmits the supervisory control signal from the supervisory control signal transmitter 111. The supervisory control signal output from the supervisory control signal transmitter 111 is wavelength-multiplexed with the wavelength-multiplexed main signal amplified by the optical amplifier 106 by the optical coupler 112 and transmitted to the next stage via the optical fiber transmission line 105. The other terminal device 113 demultiplexes the wavelength-multiplexed main signal into main signals of each wavelength by the branching filter 114 and receives it by the main signal receiver 115, and the wavelength-multiplexed light branched via the optical coupler 116. A signal is input to the supervisory control signal receiver 117 to detect the supervisory control signal. The same applies to the transmission path from the other terminal device 113 to the one terminal device 100 via the optical amplification repeater 107.

  Here, the supervisory control signal transmitters 104 and 111 are configured to include a light source and an optical modulator having a wavelength different from that of the main signal, and to transmit a supervisory control signal that is wavelength-multiplexed to the wavelength-multiplexed main signal. As shown in FIG. 11, the wavelength λosc of the supervisory control signal is generally set in a wavelength band different from the wavelength band (λ1 to λ4) of the main signal and outside the optical amplification band of the optical amplifier. .

  On the other hand, in an optical wavelength division multiplexing transmission system, an optical cross-connect device is used to freely set and switch a plurality of optical signal paths. The optical cross-connect device is basically composed of a plurality of optical signal input units and optical signal output units, and a switch unit that connects these input / output units, and an arbitrary optical signal input unit and optical signal output are controlled by the switch unit. The units are uniquely connected, and these connection combinations can be changed as required (Patent Document 1). In many cases, an optical switch that performs switching without converting an optical signal into an electrical signal is often used as the switch unit of the optical cross-connect device from the viewpoint of simplicity of configuration, cost, and reliability.

  FIG. 12 shows a configuration example of an optical wavelength division multiplexing transmission system including an optical cross-connect device. Here, for the sake of simplicity, the number of input / output paths of each of the optical cross-connect devices 10-1 to 10-4 is two, and the optical cross-connect device 10-1 and the optical cross-connect devices 10-2 and 10-3 are used. Are connected via optical fiber transmission lines 1 and 2, respectively, and optical cross-connect devices 10-2 and 10-3 and optical cross-connect device 10-4 are connected via optical fiber transmission lines 3 and 4, respectively. Indicates.

  In general, when the number of routes is M (M is an integer of 2 or more), one optical cross-connect device 10 is connected to M optical fiber transmission lines in each input / output route. Further, in the case of performing wavelength division multiplexing transmission, assuming that the number of wavelength multiplexing is N (N is an integer of 2 or more), the optical signals of the M optical fiber transmission lines are respectively N optical signals via the duplexer 11. And are connected to (N × M) input ports of the optical switch 12. Further, when client signals are input / output in the optical cross-connect device 10, client signals input from K Add ports are connected to K input ports of the optical switch 12 (K is an integer of 1 or more). The optical switch 12 cross-connects these (N × M + K) optical signals and outputs them to (N × M + K) output ports. Among these, (N × M) optical signals are wavelength-multiplexed by N optical signals by the multiplexer 13 and output to M optical fiber transmission lines, respectively, and K client signals are dropped. Output to the port.

The optical signals that are wavelength-multiplexed by the multiplexer 13 need to have different wavelengths, while the wavelength bands used for wavelength-multiplexed transmission in each optical fiber transmission line are generally common. For this reason, optical signals having the same wavelength input from different optical fiber transmission lines may be input to the multiplexer 13. In such a case, a wavelength converter is provided in a part or all of the input section of the multiplexer 13, and when wavelength competition occurs, any wavelength is converted and then input to the multiplexer 13. Take.
Japanese Patent Laid-Open No. 06-292246

  By the way, when the optical cross-connect device is connected to the optical fiber transmission line including the optical amplifier and the transmission destination of the optical signal is switched, the total optical power in the optical fiber transmission line changes according to the number of wavelength multiplexing. However, the optical signal level of each wavelength propagating in the optical fiber transmission line needs to be kept constant. This is because a decrease in the optical signal level causes a decrease in the optical signal-to-noise ratio, while an increase in the optical signal level may cause a deterioration due to the nonlinear optical effect of the optical fiber. Therefore, an optical amplifier used in an optical fiber transmission line of an optical wavelength division multiplex transmission system generally includes an automatic gain control circuit for keeping the optical signal level of each wavelength constant.

  However, it is known that an optical amplifier provided with such an automatic gain control circuit may cause a transient gain fluctuation when an input optical signal fluctuates rapidly. This transient response becomes more prominent as the fluctuation speed of the input optical signal power is closer to the gain relaxation time of the optical amplifier. The gain relaxation time is, for example, about several milliseconds in the case of a commonly used erbium-doped optical fiber amplifier, and varies depending on the operating conditions such as the type of optical amplifier and the saturation intensity. On the other hand, since the switching speed of a commonly used optical switch may be several milliseconds or less, the influence of this transient response becomes a serious problem.

  In addition, when an optical signal is input when there is no optical signal in the optical fiber transmission line, the transient response of the optical amplifier appears most prominently. A way to prevent it is taken. However, this method poses a problem in realizing a quick operation when an optical wavelength path is set or deleted by switching optical signals.

  The present invention relates to an optical amplifier for switching optical signals while transmitting a supervisory control signal in an optical wavelength multiplexing transmission system in which an optical cross-connect device is connected to an optical fiber transmission line including an optical amplifier to switch an optical signal transmission destination. It is an object of the present invention to provide an optical wavelength multiplex transmission system and an optical amplifier control method capable of reducing optical signal quality degradation due to the transient response of the optical signal.

  A first invention includes an optical switch that switches connections between a plurality of input ports and output ports, and each of a plurality of wavelength multiplexed optical signals transmitted through a plurality of optical fiber transmission lines including an optical amplifier, for each wavelength. Demultiplexing into optical signals, input to a plurality of input ports of the optical switch, and combining each optical signal of each wavelength output from the plurality of output ports of the optical switch to generate a plurality of wavelength multiplexed optical signals, Supervisory control for wavelength multiplexing to wavelength-multiplexed optical signal sent from optical switch output port to optical fiber transmission line in optical wavelength division multiplexing transmission system including optical cross-connect device that outputs to multiple optical fiber transmission lines each including optical amplifier A supervisory control signal transmitter for generating a signal, and the supervisory control signal transmitter is configured to detect when the wavelength multiplexing number of the wavelength multiplexed optical signal transmitted to the optical fiber transmission line is increased or decreased. Switch the wavelength of the supervisory control signal so that it is switched between the increasing and decreasing wavelength and the wavelength outside the optical amplification band of the optical amplifier, and suppress the fluctuation of the total optical power in the optical amplification band input to the optical amplifier in the optical fiber transmission line It is a configuration.

  The monitor control signal transmitter is arranged on the input port side of the optical switch, and the monitor control signal of the wavelength according to the increase / decrease of the wavelength multiplexing number of the wavelength multiplexed optical signal transmitted from the optical cross-connect device to each optical fiber transmission line May be output to the optical fiber transmission line via an optical switch.

  The optical wavelength division multiplexing transmission system according to the first aspect of the present invention is a monitoring system in which a wavelength division multiplexed optical signal inputted from an optical fiber transmission line to an optical cross-connect device is branched and inputted and wavelength multiplexed to a wavelength division multiplexed optical signal and transmitted. A monitoring control signal receiver for receiving the control signal is provided.

  The optical wavelength division multiplexing transmission system according to the first aspect of the invention receives a wavelength division multiplexed optical signal input from an optical fiber transmission line to an optical cross-connect device via an optical switch, and transmits the wavelength multiplexed optical signal after wavelength division multiplexing. A monitoring control signal receiver for receiving the monitoring control signal.

  A second invention includes an optical switch that switches connections between a plurality of input ports and output ports, and each of a plurality of wavelength-multiplexed optical signals transmitted through a plurality of optical fiber transmission lines including an optical amplifier, for each wavelength. Demultiplexing into optical signals, input to a plurality of input ports of the optical switch, and combining each optical signal of each wavelength output from the plurality of output ports of the optical switch to generate a plurality of wavelength multiplexed optical signals, In an optical amplifier control method of an optical wavelength multiplexing transmission system including an optical cross-connect device that outputs to each of a plurality of optical fiber transmission lines including an optical amplifier, the wavelength multiplexed optical signal transmitted from the output port of the optical switch to the optical fiber transmission line When a supervisory control signal transmitter that generates a wavelength division multiplexed supervisory control signal is used and the wavelength multiplexing number of the wavelength multiplexed optical signal transmitted to the optical fiber transmission line is increased or decreased, the increase is performed. Switching the wavelength of the supervisory control signal as change places with the wavelengths outside the optical amplification band of wavelength and an optical amplifier which suppresses a total Wako power variation of the input to the optical amplification band optical amplifier of the optical fiber transmission line.

  The monitor control signal transmitter is arranged on the input port side of the optical switch, and the monitor control signal of the wavelength according to the increase / decrease of the wavelength multiplexing number of the wavelength multiplexed optical signal transmitted from the optical cross-connect device to each optical fiber transmission line May be output to the optical fiber transmission line via an optical switch.

  The present invention switches the wavelength of the supervisory control signal when the wavelength multiplexing number of the wavelength multiplexed optical signal transmitted to the optical fiber transmission line varies according to the control of the optical switch, and the optical amplifier of the optical fiber transmission line By controlling the total optical power in the amplification band to be constant, fluctuations in the optical signal power due to the transient response of the optical amplifier can be avoided.

  As a result, optical wavelength multiplex transmission systems including optical cross-connect devices and optical amplifiers reduce optical signal quality degradation due to switching of optical cross-connect devices, ensuring high performance and high reliability of optical wavelength multiplex transmission systems. Therefore, operability can be improved.

(First embodiment)
FIG. 1 shows a first embodiment of the optical wavelength division multiplexing transmission system of the present invention.
In the figure, an optical amplification repeater 20 is connected to the optical cross-connect device 10 via optical fiber transmission lines 1 and 2. Wavelength multiplexed optical signals input from the optical fiber transmission line 1 to the optical cross-connect device 10 are separated into optical signals of respective wavelengths by the demultiplexer 11 and input to a plurality of input ports of the optical switch 12. Further, the client signal input from the terminal device 30 to the Add port of the optical cross-connect device 10 is input to the corresponding input port of the optical switch 12. The optical switch 12 cross connects the plurality of optical signals and outputs them to a plurality of output ports. Among these, the optical signal of each wavelength transmitted to the optical fiber transmission line 2 is wavelength-multiplexed by the multiplexer 13, and the client signal transmitted to the terminal device 30 is output from the Drop port.

  The above configuration is the same as that of the optical cross-connect device of the conventional optical wavelength division multiplexing system shown in FIG. The optical amplification repeater 20 has the same configuration as the optical amplification repeater 107 shown in FIG. 10, but only the optical amplifier is shown here.

  In the present embodiment, the optical cross-connect device 10 further includes a supervisory control signal receiver 14 and a supervisory control signal transmitter 15 that transmit and receive supervisory control signals. That is, the supervisory control signal receiver 14 separates and receives the supervisory control signal from the wavelength multiplexed optical signal branched by the optical coupler 16 inserted into the input port of the optical cross-connect device 10. The supervisory control signal transmitter 15 outputs a supervisory control signal, and multiplexes the wavelength multiplexed optical signal with the optical coupler 17 inserted in the output port of the optical cross-connect device 10 and sends it to the optical fiber transmission line 2. Here, by setting the wavelength of the supervisory control signal in a wavelength band different from that of the main signal as shown in FIG. 11 and outside the optical amplification band of the optical amplifier, the same monitoring as in the conventional optical wavelength multiplex transmission system is performed. Control action is possible.

  The feature of this embodiment is that when the main signal cross-connected from the optical cross-connect device 10 to the optical fiber transmission line 2 is increased or decreased, the wavelength of the supervisory control signal is switched so as to replace the increased or decreased main signal wavelength. As a result, the total optical power transmitted to the optical fiber transmission line 2 increases or decreases, but the total optical power in the optical amplification band input to the optical amplifier of the optical amplification repeater 20 is controlled to be constant.

  2 to 6 show examples of wavelength control of the monitoring control signal in the first embodiment. Here, it is assumed that the main signal wavelengths are λ1 to λ4 that match the optical amplification band as shown in FIG.

  2 (a) to 2 (d) show that the main signal of wavelength λ4 is switched by switching the optical switch at time t1 when the main signals of wavelengths λ1, λ2 and λ3 are wavelength-multiplexed and transmitted to the optical fiber transmission line 2. FIG. Indicates the situation where a signal is applied. When the main signal of wavelength λ4 is switched from the time t1 at the rising time Δt, the total optical power input to the optical amplifier of the optical amplification repeater 20 increases after the time t1. At this time, when the rise time Δt of the main signal of the wavelength λ4 is shorter than the gain relaxation time of the optical amplifier, the optical signal power of the wavelengths λ1 to λ3 fluctuates due to the transient response of the optical amplifier, leading to deterioration. become.

  Therefore, until the time t1 when the main signal of wavelength λ4 is missing, as shown in FIG. 2 (e), the wavelength of the monitor control signal is set to λ4, and when the main signal of wavelength λ4 is added, the monitor control is substituted. The wavelength of the signal is switched from λ4 to a wavelength λosc outside the optical amplification band. As a result, the total optical power input to the optical amplifier of the optical amplification repeater 20 increases as indicated by the broken line in FIG. 2 (f), but the total optical power within the optical amplification band is indicated by the solid line in FIG. 2 (f). Thus, fluctuations in the optical signal power due to the transient response of the optical amplifier can be avoided. FIGS. 3A and 3B show an example in which the wavelength of the supervisory control signal changes from λ4 to λosc when the main signal of wavelength λ4 is added among the main signals of wavelengths λ1 to λ4.

  The wavelength control of such a supervisory control signal is performed in accordance with the control of the optical switch 12 of the optical cross-connect device 10 shown in FIG. This can be handled by setting the wavelength of the supervisory control signal output from the supervisory control signal transmitter 15 and switching the wavelength of the supervisory control signal to the wavelength λosc outside the optical amplification band when the main signal of that wavelength is added. That is, when the wavelength multiplexing number of the wavelength multiplexed optical signal varies according to the control of the optical switch 12, control is performed to switch the wavelength of the supervisory control signal transmitter 15. Note that the supervisory control signal receiver 14 can receive the supervisory control signal by using an optical receiver having a wide reception band even if the wavelength of the supervisory control signal to be received is switched as shown in FIG. is there.

  Also, when there are a plurality of main signal wavelengths missing in the optical cross-connect device 10, as shown in FIGS. 4A and 4B, it corresponds to the added power of the plurality of main signals as a supervisory control signal. What is necessary is just to set it as a big light intensity. Here, when the main signal of the wavelengths λ3 and λ4 is missing, for example, the light intensity of the monitoring control signal of the wavelength λ4 is set large, and after the main signal of the wavelengths λ3 and λ4 is added, the wavelength outside the optical amplification band Switch to λosc.

  FIG. 5 shows a situation in which main signals of wavelengths λ1 to λ4 are added by switching the optical switch 12 when the main signal is not transmitted on the optical fiber transmission line 2 connected to the optical cross-connect device 10. When there is no main signal in the optical fiber transmission line 2, the wavelength of the supervisory control signal is set within the optical amplification band (here, λ4), and the supervisory control signal power is reduced and switched according to the rise time Δt of the optical signal. At the end, the wavelength is switched to the wavelength λosc outside the optical amplification band. As a result, the total optical power within the optical amplification band input to the optical amplifier of the optical fiber transmission line 2 becomes constant, and fluctuations in the optical signal power due to the transient response of the optical amplifier can be avoided.

  In FIGS. 3 and 4, (a) to (b) are cases where the main signal transmitted to the optical fiber transmission line 2 increases, but in the case where the main signal decreases, as shown in (b) to (a) In addition, the wavelength of the monitoring control signal may be switched from outside the optical amplification band to within the optical amplification band. In FIG. 5, the same applies when all the main signals of the optical fiber transmission line 2 disappear.

  FIG. 6 shows a situation in which a failure occurs in the input / output port or the optical switch 12 in the optical cross-connect device 10 and the main signal is temporarily disconnected when switching to the standby system. Although the main signal power becomes zero due to the failure of the optical cross-connect device 10, the main signal power returns to the original value when the switching operation to the standby system is started. Usually, the standby system switching process due to a failure needs to be performed quickly in order to keep the optical signal interruption time to a minimum. An excessive optical output may be generated due to the transient response of the optical amplifier. Therefore, as indicated by a broken line in FIG. 6, the wavelength of the supervisory control signal is set within the optical amplification band (here, λ4) at the same time as the failure occurs, so that the change in the optical amplifier input optical power due to the standby system switching becomes small. Change the supervisory control signal power. At the end of the standby system switching, the wavelength is switched to the wavelength λosc outside the optical amplification band. As a result, the total optical power within the optical amplification band input to the optical amplifier of the optical fiber transmission line 2 becomes constant, and fluctuations in the optical signal power due to the transient response of the optical amplifier can be avoided.

(Second Embodiment)
FIG. 7 shows a second embodiment of the optical wavelength division multiplexing transmission system of the present invention.
In the first embodiment shown in FIG. 1, a supervisory control signal transmitter 15 is arranged for each output port of the optical cross-connect device 10 to which the optical fiber transmission line 2 is connected, and according to the wavelength multiplexing number of each output port. The wavelength control of the monitoring control signal was performed. In this embodiment, at least one supervisory control signal transmitter 15 is connected to the input port of the optical switch 12, and supervisory control signals of wavelengths corresponding to the respective output ports of the optical cross-connect device 10 are sent via the optical switch 12. The monitoring control signal is wavelength-multiplexed with the wavelength multiplexed optical signal via the optical coupler 17 of each output port.

(Third embodiment)
FIG. 8 shows a third embodiment of the optical wavelength division multiplexing transmission system of the present invention.
In the first embodiment shown in FIG. 1, the monitoring control signal receiver 14 is arranged for each input port of the optical cross-connect device 10 to which the optical fiber transmission line 1 is connected. In this embodiment, at least one supervisory control signal receiver 14 is connected to the output port of the optical switch 12, and the wavelength multiplexed optical signal branched by the optical coupler 16 of each input port of the optical cross-connect device 10 is passed through the optical switch 12. The monitoring control signal receiver 14 is configured to detect the monitoring control signal.

(Fourth embodiment)
FIG. 9 shows a fourth embodiment of the optical wavelength division multiplexing transmission system of the present invention. In the present embodiment, a case is assumed in which the monitoring control signal is wavelength-multiplexed and transmitted to the client signal transmitted and received by the terminal station device 30.

  In the figure, the terminal device 30 includes a supervisory control signal receiver 14, a supervisory control signal transmitter 15, and optical couplers 16 and 17. The monitoring control signal output from the monitoring control signal transmitter 15 is wavelength-multiplexed by the optical coupler 17 and output via the optical switch 12 to the client signal input from the terminal station device 30 to the Add port of the optical cross-connect device 10. Route to the port. The wavelength of the monitoring control signal is controlled in the same manner as in the first embodiment according to the main signal wavelength routed to the output port.

  The client signal sent from the drop port of the optical cross-connect device 10 to the terminal station device 30 is branched by the optical coupler 16 and input to the supervisory control signal receiver 14 to detect the supervisory control signal.

  Further, in the configuration in which the optical cross-connect device 10 is routed as a wavelength group as a wavelength multiplexed optical signal, the client signal input from the terminal device 30 to the Add port of the optical cross-connect device 10 and the Drop port of the optical cross-connect device 10 are used. The client signal transmitted to the terminal device 30 is also a wavelength multiplexed optical signal. Here, if there is a change in the wavelength multiplexing number of the client signal input from the terminal station device 30 to the Add port of the optical cross-connect device 10, the wavelength of the supervisory control signal is controlled to be the client signal as in the above embodiment. Wavelength multiplexing may be performed.

  Also, the supervisory control signal transmitter 111 of the optical amplifying repeater 20 as shown in FIG. 10 has a function of changing the wavelength of the supervisory control signal, and the wavelength multiplexing number of the wavelength multiplexed optical signal input to the optical amplifying repeater 20 varies. If there is, the transient response in the optical amplifier at the next stage may be alleviated by controlling the wavelength of the supervisory control signal as in the above embodiment.

The figure which shows 1st Embodiment of the optical wavelength division multiplexing transmission system of this invention. The figure which shows the wavelength control example of the monitoring control signal in 1st Embodiment. The figure which shows the wavelength control example of the monitoring control signal in 1st Embodiment. The figure which shows the wavelength control example of the monitoring control signal in 1st Embodiment. The figure which shows the wavelength control example of the monitoring control signal in 1st Embodiment. The figure which shows the wavelength control example of the monitoring control signal in 1st Embodiment. The figure which shows 2nd Embodiment of the optical wavelength division multiplex transmission system of this invention. The figure which shows 3rd Embodiment of the optical wavelength division multiplex transmission system of this invention. The figure which shows 4th Embodiment of the optical wavelength division multiplex transmission system of this invention. The figure which shows the structural example of the optical wavelength multiplexing transmission system containing a supervisory control signal transmission means. The figure which shows the wavelength relationship of a main signal and a supervisory control signal. The figure which shows the structural example of the optical wavelength division multiplex transmission system containing an optical cross-connect apparatus.

Explanation of symbols

1, 2, 3, 4 Optical fiber transmission line 10 Optical cross-connect device 11 Demultiplexer 12 Optical switch 13 Multiplexer 14 Supervisory control signal receiver 15 Supervisory control signal transmitter 16, 17 Optical coupler 20, 107 Optical amplification repeater Equipment 30, 100, 113 Terminal equipment

Claims (6)

An optical switch that switches connections between multiple input ports and output ports, and demultiplexes multiple wavelength multiplexed optical signals transmitted via multiple optical fiber transmission lines including optical amplifiers into optical signals of each wavelength. A plurality of wavelength multiplexed optical signals that are input to a plurality of input ports of the optical switch and combined with optical signals of respective wavelengths output from the plurality of output ports of the optical switch, and includes an optical amplifier. In an optical wavelength division multiplexing transmission system including an optical cross-connect device that outputs to a plurality of optical fiber transmission lines,
A supervisory control signal transmitter for generating a supervisory control signal to be wavelength-multiplexed with the wavelength-multiplexed optical signal sent from the output port of the optical switch to the optical fiber transmission line;
The supervisory control signal transmitter, when there is an increase or decrease in the number of wavelength multiplexing of the wavelength multiplexed optical signal transmitted to the optical fiber transmission line, between the wavelength to increase and decrease and a wavelength outside the optical amplification band of the optical amplifier The optical wavelength division multiplexing transmission system is characterized in that the wavelength of the supervisory control signal is switched so as to be replaced by an optical amplifier, and the fluctuation of the total optical power in the optical amplification band input to the optical amplifier of the optical fiber transmission line is suppressed. In the optical wavelength division multiplexing transmission system according to claim 1,
The monitoring control signal transmitter is disposed on the input port side of the optical switch, and monitors the wavelength according to the increase / decrease of the wavelength multiplexing number of the wavelength multiplexed optical signal transmitted from the optical cross-connect device to each optical fiber transmission line. An optical wavelength division multiplexing transmission system characterized in that a control signal is output and sent to the optical fiber transmission line via the optical switch. In the optical wavelength division multiplexing transmission system according to claim 1,
A supervisory control signal reception for branching and inputting the wavelength-division multiplexed optical signal inputted to the optical cross-connect device from the optical fiber transmission line and receiving the supervisory control signal transmitted by wavelength multiplexing to the wavelength-multiplexed optical signal An optical wavelength division multiplexing transmission system characterized by comprising an optical device. In the optical wavelength division multiplexing transmission system according to claim 1,
Monitoring that receives the wavelength-division multiplexed optical signal input from the optical fiber transmission line to the optical cross-connect device via the optical switch and receives the supervisory control signal transmitted by wavelength multiplexing to the wavelength-multiplexed optical signal An optical wavelength division multiplexing transmission system comprising a control signal receiver. An optical switch that switches connections between multiple input ports and output ports, and demultiplexes multiple wavelength multiplexed optical signals transmitted via multiple optical fiber transmission lines including optical amplifiers into optical signals of each wavelength. A plurality of wavelength multiplexed optical signals that are input to a plurality of input ports of the optical switch and combined with optical signals of respective wavelengths output from the plurality of output ports of the optical switch, and includes an optical amplifier. In an optical amplifier control method of an optical wavelength division multiplexing transmission system including an optical cross-connect device that outputs to a plurality of optical fiber transmission lines,
The wavelength multiplexed light transmitted to the optical fiber transmission line by using a supervisory control signal transmitter for generating a supervisory control signal to be wavelength multiplexed to the wavelength multiplexed optical signal transmitted from the output port of the optical switch to the optical fiber transmission line. When there is an increase / decrease in the number of multiplexed signals, the wavelength of the monitoring control signal is switched so that the increased / decreased wavelength and the wavelength outside the optical amplification band of the optical amplifier are switched, and the light of the optical fiber transmission line is changed. A method for controlling an optical amplifier, characterized by suppressing fluctuations in the total optical power of an optical amplification band input to the amplifier. The optical amplifier control method according to claim 5,
The monitoring control signal transmitter is disposed on the input port side of the optical switch, and monitors the wavelength according to the increase / decrease of the wavelength multiplexing number of the wavelength multiplexed optical signal transmitted from the optical cross-connect device to each optical fiber transmission line. A control signal is output and sent to the optical fiber transmission line via the optical switch.

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