JP2010154062A - Optical transmitter, and method for setting transmission wavelength - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical transmitter provided with a mechanism for automatically setting a transmission wavelength of a transmitter variable in transmission wavelength. <P>SOLUTION: A wavelength setter 260 subsequently sends a wavelength setting signal to a drive part 212 and a BPF 240 so that wavelengths λ<SB>0</SB>to λ<SB>N</SB>are set, and sweeps all the wavelengths the wavelengths λ<SB>0</SB>to λ<SB>N</SB>in the BPF 240. In the meantime, when an optical intensity detector 250 detects the wavelength, the wavelength setter 260 recognizes that the wavelength detected is one already set and registers it. The wavelength setter 260 sends a wavelength setting signal to the drive part 212 and the BPF 230 while skipping the set wavelengths, and sweeps unset wavelengths. In so doing, in the optical intensity detector 250, when the wavelength is not detected, the wavelength setting signal is changed in the next wavelength. On the other hand, when the wavelength is detected in the optical intensity detector, transmission wavelength of a transmitter connected to an input port of a multiplexer is set to the wavelength. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical transmission apparatus and a transmission wavelength setting method, and more specifically, in a wavelength division multiplexing optical communication system using a transmitter whose transmission wavelength is variable, optical transmission for automatically setting the transmission wavelength of the transmitter. The present invention relates to an apparatus and a transmission wavelength setting method.

  In recent years, with the increase of normal data traffic including the Internet, construction of large-capacity core networks and metro networks using wavelength division multiplexing (WDM) technology is progressing. This technology can contribute not only to an increase in capacity but also to a flexible network construction by assigning different services and users for each wavelength.

FIG. 1 shows the configuration of a conventional optical transceiver used in a WDM optical communication system. This optical transceiver includes N optical transceivers 110-1 to 110 -N, a wavelength multiplexer 120, and a wavelength demultiplexer 130. Further, the optical transceivers 110-1 to 110-N include transmitters 111-1 to 111-N and receivers 112-1 to 112-N. The transmission wavelengths of the transmitters 111-1 to 111 -N match the transmission wavelength of each input port of the wavelength multiplexer 120. For example, the optical transceiver 110-1 transmits an optical signal having a wavelength λ _1. Then, it is connected to the input port of the wavelength multiplexer 120 that transmits the wavelength λ ₁ with respect to the output port. The same applies to the optical transceivers 110-2 to 110-N. At the output port of the wavelength multiplexer 120, WDM signals of λ _{1 to} λ _N are generated and incident on the optical fiber transmission line. On the other hand, the WDM signal sent from the optical fiber transmission line is demultiplexed for each wavelength by the wavelength demultiplexer 130. The demultiplexed optical signals are sent to the respective receivers 112-1 to 112 -N of the optical transceivers 110-1 to 110 -N and are individually received (see Patent Document 1).

  Conventionally, a laser having a fixed transmission wavelength is used as a light source mounted on the transmitters 111-1 to 111 -N. However, it is desirable to use a laser whose transmission wavelength is variable. Since the wavelength range that can be received by the receivers 112-1 to 112 -N is wide, if a laser capable of changing the transmission wavelength can be mounted on the transmitters 111-1 to 111 -N, the optical transceivers 110-1 to 110 -N are installed. This is because a single product is produced, and wavelength management becomes easy. In recent years, wavelength tunable lasers aimed at lowering prices have been put on the market, and it has become feasible to make a single type of optical transceiver.

FIG. 2 shows a configuration of a conventional optical transmission device using a transmitter whose transmission wavelength is variable. The optical transmitter 140-1 and the optical transmitter 140-2 are set so that wavelengths λ ₁ and λ ₂ are transmitted, respectively, and further, the wavelength λ ₁ and the wavelength λ ₁ for each output port, and It is connected to an input port of the wavelength multiplexer 120 which transmits the wavelength lambda _2. Here, as shown in the figure, a case is considered in which the optical transmitter 140-3 is newly connected to the input port of the wavelength multiplexer 120. In that case, as the wavelength lambda ₃ from the optical transmitter 140-3 is transmitted, it sets the transmission wavelength by some technique from an external transmitter 141-3, further to the output port of the optical transmitter 110-3 working by connecting the input port # 3 of the wavelength multiplexer 120 which transmits the wavelength lambda ₃ Te is once completed.

JP 2002-031786 A

  However, when all these operations for matching the transmission wavelength of the transmitter 110-3 with the input port of the wavelength multiplexer through which the transmission wavelength passes are left to human judgment, in the optical transmission device having a large number of wavelengths, There was a problem that human error could occur with high probability.

  The present invention has been made in view of such problems, and an object thereof is to automatically set the transmission wavelength of a transmitter in a WDM optical communication system using a transmitter whose transmission wavelength can be varied. It is an object of the present invention to provide an optical transmission apparatus and a transmission wavelength setting method capable of eliminating human errors that may occur in the connection work between an optical transmitter and a wavelength multiplexer.

  In order to achieve such an object, the invention described in claim 1 includes a transmitter capable of changing a transmission wavelength, a wavelength multiplexer for wavelength multiplexing the transmission wavelength of the transmitter, and the wavelength multiplexing. An optical filter connected to the wavelength combiner for changing the transmission wavelength so that the output light of the optical filter can be inputted, and an optical intensity detection connected to the optical filter so that the output light of the optical filter can be inputted And a wavelength setting unit connected to the optical filter so as to be able to set a transmission wavelength of the optical filter connected to the light intensity detector, and the transmitter or the transmission wavelength can be varied. When a new transmitter is newly connected to an arbitrary input port of the wavelength multiplexer, the wavelength setting unit connects the newly connected transmitter so that a transmission wavelength can be set, and Sweep the transmission wavelength of the optical filter (first sweep); The light intensity detector stores the first transmission wavelength detected in the first sweep as a preset wavelength, and combines the transmission wavelength of the transmitter with the transmission wavelength of the optical filter, and sets the preset wavelength. While skipping, the transmission wavelength of the newly connected transmitter and the transmission wavelength of the optical filter are swept (second sweep), and the second transmission wavelength detected by the light intensity detector in the second sweep Is set as the transmission wavelength of the newly connected transmitter.

  According to a second aspect of the present invention, in the optical transmission device according to the first aspect of the present invention, the optical transmitter further includes a wavelength monitoring circuit. The set wavelength information is recognized based on the set wavelength information, and the set wavelength information of the transmitter is transmitted to the wavelength monitoring circuit after the setting of the transmit wavelength of the transmitter is completed.

  According to a third aspect of the present invention, in the optical transmission device according to the second aspect, the wavelength monitoring circuit monitors energization information of the transmitter, transmits the energization information to the wavelength setting device, and transmits the wavelength. The setter is characterized in that when the transmitter registered as a preset wavelength is not energized, the transmit wavelength of the non-energized transmitter is registered as an unset wavelength.

  According to a fourth aspect of the present invention, there is provided a transmitter capable of changing a transmission wavelength, a wavelength multiplexer that multiplexes transmission wavelengths of the transmitter, and an output light of the wavelength multiplexer that is input. An optical filter connected to a wavelength multiplexer capable of changing a transmission wavelength, an optical intensity detector connected to the optical filter so that output light of the optical filter is input, and an optical intensity detector connected to the optical filter Wavelength information detector and a wavelength setting device connected to the light intensity detector and connected to the transmitter and the optical filter so that the transmission wavelength of the transmitter and the transmission wavelength of the optical filter can be set When the transmitter or a new transmitter capable of changing the transmission wavelength is newly connected to an arbitrary input port of the wavelength multiplexer, the wavelength setting unit can set the transmission wavelength. Connect the newly connected transmitter as Then, the transmission wavelength of the newly connected transmitter is blinked, and the transmission wavelength of the newly connected transmitter and the transmission wavelength of the optical filter are matched, and the transmission wavelength of the newly connected transmitter and the optical filter The transmission wavelength is swept, the light intensity detector detects the swept transmission wavelength, and the wavelength when the wavelength information detector detects blinking of the transmission wavelength of the transmitter is newly connected. The transmission wavelength of the transmitter is set.

  The invention according to claim 5 is a transmitter capable of changing a transmission wavelength, a wavelength information superimposing device that superimposes wavelength setting information on the transmission wavelength of the transmitter, and a wavelength that combines the transmission wavelengths of the transmitter. A multiplexer, an optical filter connected to the wavelength multiplexer so that the output light of the wavelength multiplexer is input, and a transmission wavelength that can be varied, and the output light of the optical filter is input. A light intensity detector connected to an optical filter, a wavelength information detector connected to the light intensity detector, and the light connected to the light intensity detector so that a transmission wavelength of the optical filter can be set. A wavelength setting device connected to a filter, and a new transmitter capable of changing a transmission wavelength, on which the transmitter or wavelength setting information is superimposed, is newly connected to an arbitrary input port of the wavelength multiplexer The wavelength setting unit determines the transmission wavelength. The transmission wavelength of the newly connected transmitter and the optical filter while matching the transmission wavelength of the transmitter and the transmission wavelength of the optical filter. The wavelength when the light intensity detector detects the swept transmission wavelength, and the wavelength information detector detects the wavelength setting information indicating that the wavelength is not set. It is characterized by being set as a transmission wavelength of a connected transmitter.

  The invention according to claim 6 is configured such that a transmitter capable of changing a transmission wavelength, a wavelength multiplexer that multiplexes transmission wavelengths of the transmitter, and an output light of the wavelength multiplexer are input. An optical filter connected to a wavelength multiplexer capable of changing a transmission wavelength, an optical intensity detector connected to the optical filter so that output light of the optical filter is input, and an optical intensity detector connected to the optical filter And a wavelength setting unit connected to the optical filter so that the transmission wavelength of the optical filter can be set, wherein the transmitter or a new transmitter capable of changing the transmission wavelength is A transmission wavelength setting method for the newly connected transmitter when newly connected to an arbitrary input port of the wavelength multiplexer, wherein the light intensity detector is capable of setting a transmission wavelength. To connect the transmitter connected to the The wavelength setting unit sweeps the transmission wavelength of the optical filter (first sweep); and the wavelength setting unit detects the first transmission wavelength detected by the light intensity detector in the first sweep. The step of storing as a preset wavelength, and the wavelength setter of the newly connected transmitter while skipping the preset wavelength while combining the transmission wavelength of the transmitter and the transmission wavelength of the optical filter A step of sweeping a transmission wavelength and a transmission wavelength of the optical filter (second sweep), and transmission of the second transmission wavelength detected by the wavelength setter in the second sweep by the newly connected transmitter And setting as a wavelength.

  The invention described in claim 7 is a transmitter that can change a transmission wavelength, a wavelength multiplexer that multiplexes transmission wavelengths of the transmitter, and an output light of the wavelength multiplexer that is input. An optical filter connected to a wavelength multiplexer capable of changing a transmission wavelength, an optical intensity detector connected to the optical filter so that output light of the optical filter is input, and an optical intensity detector connected to the optical filter Wavelength information detector and a wavelength setting device connected to the light intensity detector and connected to the transmitter and the optical filter so that the transmission wavelength of the transmitter and the transmission wavelength of the optical filter can be set The newly connected transmitter when the transmitter or a new transmitter capable of changing the transmission wavelength is newly connected to an arbitrary input port of the wavelength multiplexer The transmission wavelength setting method of Connecting the newly connected transmitter so that the wavelength setter can set the transmission wavelength; flashing the transmission wavelength of the newly connected transmitter; and the wavelength setter transmitting the transmission Sweeping the transmission wavelength of the newly connected transmitter and the transmission wavelength of the optical filter while matching the transmission wavelength of the optical filter and the transmission wavelength of the optical filter; and the wavelength setting unit detects the light intensity A step of detecting a swept transmission wavelength, and setting a wavelength when the wavelength information detector detects blinking of the transmission wavelength of the transmitter as a transmission wavelength of the newly connected transmitter; It is characterized by having.

  The invention according to claim 8 is a transmitter capable of changing a transmission wavelength, a wavelength information superimposing device that superimposes wavelength setting information on the transmission wavelength of the transmitter, and a wavelength that combines the transmission wavelengths of the transmitter. A multiplexer, an optical filter connected to the wavelength multiplexer so that the output light of the wavelength multiplexer is input, and a transmission wavelength that can be varied, and the output light of the optical filter is input. A light intensity detector connected to an optical filter, a wavelength information detector connected to the light intensity detector, and the light connected to the light intensity detector so that a transmission wavelength of the optical filter can be set. In an optical transmission device including a wavelength setting device connected to a filter, the transmitter or a new transmitter on which wavelength setting information is superimposed and capable of changing a transmission wavelength is an arbitrary input port of the wavelength multiplexer When newly connected to A transmission wavelength setting method of the transmitter, the step of connecting the newly connected transmitter so that the wavelength setting device can set the transmission wavelength; and the wavelength setting device of the transmitter The step of sweeping the transmission wavelength of the newly connected transmitter and the transmission wavelength of the optical filter while adjusting the transmission wavelength and the transmission wavelength of the optical filter, and the wavelength setting unit, the light intensity detector Detecting the swept transmission wavelength, and setting the wavelength when the wavelength information detector detects the wavelength setting information indicating that the wavelength is not set as a transmission wavelength of the newly connected transmitter; It is characterized by having.

  According to the present invention, in a WDM optical communication system using a transmitter whose transmission wavelength can be varied, a mechanism for automatically setting the transmission wavelength of the transmitter is provided, thereby connecting the optical transmitter and the wavelength multiplexer. It is possible to eliminate human errors that may occur in the work.

(Embodiment 1)
FIG. 3 shows the configuration of the optical transmission apparatus according to the first embodiment of the present invention. The optical transmitter includes N optical transmitters 210-1 to 210-N, a wavelength multiplexer 220, an optical splitter 230, and a bandpass filter (BPF) capable of changing the transmission wavelength in the range of λ ₁ to λ _N. 240, a light intensity detector 250, and a wavelength setting unit 260. Further, each of the optical transmitters 210-1 to 210 -N has transmitters 211-1 to 211 _-N whose transmission wavelengths can be varied in a range of λ ₀ to λ N, and transmitters 211-1 to 211 -N. It is comprised from the drive parts 212-1 to 212-N which drive. Here, the driving units 212-1 to 212-N set the wavelengths of the transmitters 211-1 to 211-N based on the wavelength setting signal from the wavelength setting unit 260 or turn on / off the wavelength output. Optical transmitters 211-1, and the optical transmitter 211-2, the wavelength lambda _1, and the wavelength lambda ₂ is set to be transmitted, further each wavelength lambda ₁ to the output port, and wavelength lambda ₂ It is connected to the input port of the wavelength multiplexer 220 that transmits.

As an example, here, the operator, new light transmitter 210-3, a case connected to the input port # 4 of the wavelength multiplexer 220 which transmits the wavelength lambda ₄ to the output port.

FIG. 4 shows a flowchart of the wavelength setting operation by the present optical transmitter. First, the wavelength setting unit 260 sequentially sends a wavelength setting signal so as to set the wavelengths λ ₀ to λ _{N to} the driving unit 212 and the BPF 240, and the BPF 240 sets all wavelengths from λ _{1 to} λ _N. A sweep is performed (first sweep, S301). Meanwhile, when the light intensity detector 250 detects the wavelength, the wavelength setting unit 260 recognizes that the detected wavelength is the preset wavelength and registers it (S302). Subsequently, the wavelength setting unit 260 sends a wavelength setting signal to the drive unit 212 and the BPF 230 while skipping the set wavelength, and sweeps the unset wavelength (second sweep, S303). At this time, when the wavelength is not detected in the light intensity detector 250, the wavelength setting signal is changed to the next wavelength. On the other hand, when the wavelength is detected in the light intensity detector, the transmission wavelength of the transmitter connected to the input port of the wavelength multiplexer is set to the wavelength, and the wavelength setting operation is completed (S304).

In the first embodiment illustrated in FIG. 3, the wavelength setting unit 260 sweeps the transmission wavelength of the transmitter 212-3 and the transmission wavelength of the BPF 240 in the order of λ ₁ → λ ₂ → ˜ → λ _N , so that λ ₁ to Recognizing that the wavelength of λ ₂ is the preset wavelength, and subsequently sweeping in the order of λ ₃ → λ ₄ , finally, the transmission wavelength of the transmitter 212-3 is set to λ ₄ and the operation Has ended.

  According to the optical transmission apparatus according to the first embodiment, in a WDM optical communication system using a transmitter whose transmission wavelength is variable, transmission of transmitters 211-1 to 211 -N connected to a wavelength multiplexer 220. The function of automatically setting the transmission wavelength is realized using a mechanism that sweeps while matching the wavelength and the transmission wavelength of the BPF 240.

(Embodiment 2)
FIG. 5 shows a configuration of an optical transmission apparatus according to Embodiment 2 of the present invention. The configuration is almost the same as that of the optical transmission apparatus shown in the first embodiment, but is different from the first embodiment in that a wavelength monitoring circuit 270 connected to the wavelength setting device 260 is added.

FIG. 6 shows a flowchart of the wavelength setting operation by the optical transmission apparatus according to the second embodiment. Unlike the flowchart shown in FIG. 4, the wavelength setting unit 260 recognizes the preset wavelength by reading the preset wavelength information from the wavelength monitoring circuit 270. In addition, an operation for sending set wavelength information to the wavelength monitoring circuit 270 is added after the wavelength setting is completed. In the configuration of FIG. 5, the wavelength setting unit 260 reads the preset wavelength information from the wavelength monitoring circuit 270 to recognize that the wavelengths λ ₁ to λ ₂ are the preset wavelengths, and then transmits to the transmitter 212. -3 and the transmission wavelength of the BPF 240 are swept in the order of λ ₃ → λ ₄ , so that the transmission wavelength of the transmitter 212-3 is finally set to λ ₄ and the operation ends. .

  According to the optical transmission apparatus according to the second embodiment, the wavelength setting unit 260 reads the preset wavelength information from the wavelength monitoring circuit 270 and recognizes it, thereby omitting the first sweep in the first embodiment, and the wavelength. Time to complete setting can be shortened.

(Embodiment 3)
FIG. 7 shows the configuration of an optical transmission apparatus according to Embodiment 3 of the present invention. The configuration of the optical transmitter shown in the second embodiment is almost the same, but the energization information of the transmitters 212-1 to 212-N is transmitted from the optical transmitters 210-1 to 210-N to the wavelength monitoring circuit 270. Is different.

  According to the optical transmission device according to the third embodiment, when the optical transmitters 210-1 to 210 -N are removed from the optical transmission device and the existing wavelength setting used until then becomes empty, the wavelength monitoring circuit 270 can recognize the wavelength as an unset wavelength. In addition, transmission of energization information may always be performed or may be performed periodically at intervals.

(Embodiment 4)
FIG. 8 shows a configuration of an optical transmission apparatus according to Embodiment 4 of the present invention. The configuration is almost the same as that of the optical transmission apparatus shown in the first embodiment, but is different from the first embodiment in that a wavelength information detector 280 is added between the light intensity detector 250 and the wavelength setting device 260. In addition, the transmission wavelength of the transmitter 211-3 that is newly connected to the wavelength multiplexer 220 is blinking.

  The wavelength setting operation is performed as follows. First, the transmission wavelength of the transmitter is sequentially swept while matching the transmission wavelength of the transmitter connected to the wavelength multiplexer and the transmission wavelength of the optical filter. At that time, when the light intensity detector detects the swept transmission wavelength, and the wavelength information detector does not detect the blinking of the transmission wavelength of the transmitter, the light intensity detector recognizes the wavelength as the preset wavelength, and the next wavelength. Move on. On the other hand, when the light intensity detector detects the swept transmission wavelength and the wavelength information detector detects blinking of the transmission wavelength of the transmitter, the transmission wavelength of the transmitter 212-3 is set to the wavelength. To do.

In FIG. 8, transmitters 211-1 to 211-3 are connected to the input ports # 1, # 2, and # 4 of the wavelength multiplexer 220, and the transmitter 211-3 is set. . While the wavelength setting unit 260 sweeps the transmission wavelength of the transmitter 212-3 and the transmission wavelength of the BPF 240 in the order of λ ₁ → λ ₂ , the light intensity detector 250 detects the wavelength, but the wavelength information Since the detector 280 does not detect blinking of the transmission wavelength of the transmitter 212-3, the wavelength setting device 260 recognizes that the wavelength of λ ₁ → λ ₂ is the preset wavelength. Subsequently, Turning to the wavelength lambda _3, because since the wavelength lambda ₃ to the permeable input port # 3 is not connected transmitter, the light intensity detector 250 does not detect the transmission wavelength, wavelength setting 260 is the lambda ₃ is capable of transmitting an input port # 3 moves to and lambda ₄ recognizes that the transmitter is not connected. When the wavelength shifts to lambda _4, the light intensity detector 250 detects the wavelength, further wavelength information detector 280 for detecting the flashing of the transmission wavelength of the transmitter 212-3, wavelength setting unit 260, lambda ₄ There recognizes that is not set wavelength, finally, sets the transmission wavelength of the transmitter 212-3 in lambda _4, the operation ends.

According to the optical transmission apparatus according to the present example, if the wavelengths λ ₁ to λ _N are swept, an unset wavelength can be found during the sweep. Therefore, during the first sweep in the first embodiment, the wavelength is changed. The setting is completed, and the time until the wavelength setting is completed can be shortened as in the second embodiment.

(Embodiment 5)
FIG. 9 shows the configuration of an optical transmission apparatus according to Embodiment 5 of the present invention. The configuration is almost the same as that of the optical transmission apparatus shown in the fourth embodiment, but is different in that wavelength information superimposing units 213-1 to 213-3 are added to the optical transmitters 210-1 to 210-3. In addition, the transmission wavelength of the transmitter 211-3 connected to the wavelength multiplexer 220 is not blinking, but the wavelength information superimposing unit 213-3 superimposes the wavelength unset information and the data signal, and then superimposes the signal. Thus, the transmitter 211-3 connected to the wavelength multiplexer 220 is modulated. Examples of methods for superimposing data signals and unused wavelength information include a method of alternately multiplexing on the time axis using a layer 2 switch, and a method of multiplexing on different frequency axes using SCM (sub carier multiplexing). Can be mentioned.

  The wavelength setting operation is performed as follows. First, the transmission wavelength of the transmitter is sequentially swept while matching the transmission wavelength of the transmitter connected to the wavelength multiplexer and the transmission wavelength of the optical filter. At this time, the light intensity detector detects the swept transmission wavelength, and when the wavelength information detector does not detect unused wavelength information, it recognizes the wavelength as a preset wavelength and moves to the next wavelength. On the other hand, when the light intensity detector detects the swept transmission wavelength and the wavelength information detector detects unused wavelength information, the transmission wavelength of the transmitter is set to the wavelength.

In the configuration of FIG. 9, while the wavelength setting unit 260 sweeps the transmission wavelength of the transmitter 211-3 and the transmission wavelength of the BPF 240 in the order of λ ₁ → λ ₂ , the light intensity detector 250 changes the wavelength. Although detected, the wavelength information detector 280 does not detect unused wavelength information, so the wavelength setting unit 260 recognizes that the wavelength of λ ₁ → λ ₂ is the preset wavelength. Subsequently, the wavelength shifts to the wavelength λ ₃ , but since the light intensity detector 250 does not detect the wavelength, the wavelength setting unit 260 recognizes that λ ₃ is the preset wavelength, and shifts to λ ₄ . When the wavelength shifts to λ ₄ , the light intensity detector 250 detects the wavelength, and the wavelength information detector 280 detects unused wavelength information. Therefore, the wavelength setting unit 260 has λ ₄ as the preset wavelength. recognizes that, finally, sets the transmission wavelength of the transmitter 211-3 in lambda _4, the operation ends.

According to the optical transmission apparatus according to the present example, if the wavelengths λ ₁ to λ _N are swept, an unset wavelength can be found during the sweep. Therefore, during the first sweep in the first embodiment, the wavelength is changed. The setting is completed, and the time until the wavelength setting is completed can be shortened as in the second embodiment.

  In the first to fifth embodiments, the wavelength multiplexer 220 and the BPF 240 are connected via the optical splitter 230. This is because the optical transmitter 210 newly connected during use of the optical transmitter is used. This is for setting the transmission wavelength. Therefore, when the use of the optical transmitter is interrupted and the optical transmitter 210 is set, the wavelength multiplexer 220 and the BPF 240 may be connected without using the optical splitter 230.

It is a figure which shows the structure of the conventional optical transmitter / receiver used in a WDM optical communication system. It is a figure which shows the structure of the conventional optical transmitter using the transmitter which can vary a transmission wavelength. It is a figure which shows the structure of the optical transmitter which concerns on Embodiment 1 of this invention. It is a flowchart of the wavelength setting operation | movement by this optical transmitter. It is a figure which shows the structure of the optical transmitter which concerns on Embodiment 2 of this invention. 10 is a flowchart of wavelength setting operation by the optical transmission apparatus according to the second embodiment. It is a figure which shows the structure of the optical transmitter which concerns on Embodiment 3 of this invention. It is a figure which shows the structure of the optical transmitter which concerns on Embodiment 4 of this invention. It is a figure which shows the structure of the optical transmitter which concerns on Embodiment 5 of this invention.

Explanation of symbols

110 Optical transceiver 111, 141, 211 Transmitter 112 Receiver 120, 220 Wavelength multiplexer 130 Wavelength demultiplexer 140, 210 Optical transmitter 142, 212 Drive unit 213 Wavelength information superimposer 230 Optical branching device 240 BPF
250 Light intensity detector 260 Wavelength setting device 270 Wavelength monitoring circuit 280 Wavelength information detector

Claims (8)

A transmitter capable of changing the transmission wavelength; and
A wavelength multiplexer for wavelength multiplexing the transmission wavelength of the transmitter;
An optical filter capable of changing a transmission wavelength connected to the wavelength multiplexer so that output light of the wavelength multiplexer is input;
A light intensity detector connected to the optical filter so that the output light of the optical filter is input;
A wavelength setting unit connected to the optical filter so that a transmission wavelength of the optical filter connected to the optical intensity detector can be set;
When the transmitter or a new transmitter capable of changing the transmission wavelength is newly connected to an arbitrary input port of the wavelength multiplexer, the wavelength setting unit includes:
Connect the newly connected transmitter so that the transmission wavelength can be set,
Sweeping the transmission wavelength of the optical filter (first sweep);
Registering the first transmission wavelength detected by the light intensity detector in the first sweep as a preset wavelength;
While adjusting the transmission wavelength of the transmitter and the transmission wavelength of the optical filter, the transmission wavelength of the newly connected transmitter and the transmission wavelength of the optical filter are swept while skipping the preset wavelength (second Sweep)
An optical transmission apparatus characterized in that the second transmission wavelength detected by the light intensity detector in the second sweep is set as a transmission wavelength of the newly connected transmitter.   Further, a wavelength monitoring circuit is provided, and the wavelength setting unit registers the set wavelength based on the set wavelength information in the wavelength monitoring circuit instead of performing the first sweep, and transmits the transmitter. 2. The optical transmission device according to claim 1, wherein after the wavelength setting is completed, set wavelength information of the transmitter is transmitted to the wavelength monitoring circuit.   The wavelength monitoring circuit monitors energization information of the transmitter and transmits the energization information to the wavelength setting unit, and the wavelength setting unit is not energized for the transmitter registered as a preset wavelength. 3. The optical transmission device according to claim 2, wherein the transmission wavelength of the transmitter that is not energized at the time is registered as an unset wavelength. A transmitter capable of changing the transmission wavelength; and
A wavelength multiplexer for wavelength multiplexing the transmission wavelength of the transmitter;
An optical filter capable of changing a transmission wavelength connected to the wavelength multiplexer so that output light of the wavelength multiplexer is input;
A light intensity detector connected to the optical filter so that the output light of the optical filter is input;
A wavelength information detector connected to the light intensity detector;
A wavelength setting unit connected to the light intensity detector and connected to the transmitter and the optical filter so that a transmission wavelength of the transmitter and a transmission wavelength of the optical filter can be set;
When the transmitter or a new transmitter capable of changing the transmission wavelength is newly connected to an arbitrary input port of the wavelength multiplexer, the wavelength setting unit includes:
Connect the newly connected transmitter so that the transmission wavelength can be set,
Flashing the transmission wavelength of the newly connected transmitter,
While combining the transmission wavelength of the transmitter and the transmission wavelength of the optical filter, sweep the transmission wavelength of the newly connected transmitter and the transmission wavelength of the optical filter,
The wavelength at which the light intensity detector detects the swept transmission wavelength and the wavelength information detector detects blinking of the transmission wavelength of the transmitter is the transmission wavelength of the newly connected transmitter. An optical transmitter characterized by being set as follows. A transmitter capable of changing the transmission wavelength; and
A wavelength information superimposing device that superimposes wavelength setting information on the transmission wavelength of the transmitter;
A wavelength multiplexer for wavelength multiplexing the transmission wavelength of the transmitter;
An optical filter capable of changing a transmission wavelength connected to the wavelength multiplexer so that output light of the wavelength multiplexer is input;
A light intensity detector connected to the optical filter so that the output light of the optical filter is input;
A wavelength information detector connected to the light intensity detector;
A wavelength setting unit connected to the optical filter so as to be connected to the optical intensity detector and set a transmission wavelength of the optical filter;
When the transmitter or a new transmitter capable of changing the transmission wavelength, on which the wavelength setting information is superimposed, is newly connected to an arbitrary input port of the wavelength multiplexer, the wavelength setting unit is:
Connect to the newly connected transmitter so that the transmission wavelength can be set,
While adjusting the transmission wavelength of the transmitter and the transmission wavelength of the optical filter, the transmission wavelength of the newly connected transmitter and the transmission wavelength of the optical filter are swept,
Transmitting the wavelength of the newly connected transmitter when the light intensity detector detects the swept transmission wavelength and the wavelength information detector detects the wavelength setting information indicating that the wavelength is not set. An optical transmitter characterized by being set as a wavelength. A transmitter capable of changing a transmission wavelength, a wavelength multiplexer for wavelength multiplexing the transmission wavelength of the transmitter, and a transmission connected to the wavelength multiplexer so that output light of the wavelength multiplexer is input An optical filter capable of changing the wavelength, an optical intensity detector connected to the optical filter so that output light of the optical filter is input, and a transmission wavelength of the optical filter connected to the optical intensity detector In the optical transmission device including the wavelength setting unit connected to the optical filter so that the transmission wavelength can be set, the transmitter or a new transmitter capable of changing the transmission wavelength is an arbitrary input port of the wavelength multiplexer. A transmission wavelength setting method of the newly connected transmitter when newly connected to
Connecting the newly connected transmitter so that the light intensity detector can set the transmission wavelength;
The wavelength setter sweeps the transmission wavelength of the optical filter (first sweep);
Storing the first transmission wavelength detected by the light intensity detector in the first sweep as a preset wavelength;
While the wavelength setting unit matches the transmission wavelength of the transmitter and the transmission wavelength of the optical filter, the transmission wavelength of the newly connected transmitter and the transmission wavelength of the optical filter while skipping the preset wavelength Sweeping (second sweep);
And a step of setting the second transmission wavelength detected by the wavelength setting device in the second sweep as a transmission wavelength of the newly connected transmitter. A transmitter capable of changing a transmission wavelength, a wavelength multiplexer for wavelength multiplexing the transmission wavelength of the transmitter, and a transmission connected to the wavelength multiplexer so that output light of the wavelength multiplexer is input An optical filter capable of changing the wavelength; a light intensity detector connected to the optical filter so that output light of the optical filter is input; a wavelength information detector connected to the light intensity detector; In an optical transmission device comprising a wavelength setting device connected to an optical intensity detector and connected to the transmitter and the optical filter so that a transmission wavelength of the transmitter and a transmission wavelength of the optical filter can be set, A transmission wavelength setting method for the newly connected transmitter when the transmitter or a new transmitter capable of changing the transmission wavelength is newly connected to an arbitrary input port of the wavelength multiplexer,
Connecting the newly connected transmitter so that the wavelength setter can set the transmission wavelength;
The newly connected transmitter blinks the transmission wavelength;
The wavelength setter sweeps the transmission wavelength of the newly connected transmitter and the transmission wavelength of the optical filter while matching the transmission wavelength of the transmitter and the transmission wavelength of the optical filter;
The wavelength setting unit is newly connected to a wavelength when the light intensity detector detects the swept transmission wavelength and the wavelength information detector detects blinking of the transmission wavelength of the transmitter. And setting as a transmission wavelength of the transmitter. A transmitter capable of changing a transmission wavelength, a wavelength information superimposing device that superimposes wavelength setting information on the transmission wavelength of the transmitter, a wavelength multiplexer that wavelength-multiplexes the transmission wavelength of the transmitter, and the wavelength multiplexing An optical filter connected to the wavelength combiner for changing the transmission wavelength so that the output light of the optical filter can be inputted, and an optical intensity detection connected to the optical filter so that the output light of the optical filter can be inputted A wavelength information detector connected to the light intensity detector, a wavelength setting device connected to the light intensity detector and connected to the optical filter so that a transmission wavelength of the optical filter can be set. When the transmitter or a new transmitter capable of changing the transmission wavelength is newly connected to an arbitrary input port of the wavelength multiplexer, the transmitter or wavelength setting information is superimposed on the optical transmitter. Transmitted wave of newly connected transmitter A setting method,
Connecting the newly connected transmitter so that the wavelength setter can set the transmission wavelength;
Sweeping the transmission wavelength of the newly connected transmitter and the transmission wavelength of the optical filter while the wavelength setting unit matches the transmission wavelength of the transmitter and the transmission wavelength of the optical filter;
The wavelength setter newly connects the wavelength when the light intensity detector detects the swept transmission wavelength and the wavelength information detector detects the wavelength setting information indicating that the wavelength is not set. And setting as a transmission wavelength of the transmitted transmitter.

Images