JP2010219729A - Optical wavelength branch insertion device and optical wavelength division multiplex transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical wavelength branch insertion device which has misconnection and misconfiguration prevention functions for an insertion wavelength to remove the effect on a passing wavelength by the insertion wavelength. <P>SOLUTION: Optical multiplexer/demultiplexer 412 and 421 have insertion wavelength block parts 812 and 821 provided with a passing/interruption function of optional wavelengths for the passing wavelength from branch wavelength block parts 712 and 721 as an insertion wavelength control function which controls whether to multiplex an optional insertion wavelength, and interrupt the insertion wavelength that has the same wavelength as the passing wavelength, of the insertion wavelengths of each wavelength outputted from optical wavelength multiplexers 612 and 621. Instead of the insertion wavelength block parts 812 and 821, a variable attenuator to variably attenuate an optional wavelength may also be arranged, or an output control means of optical transmission and receiving device for permitting or stopping output from an optical transmission and receiving device of an optional wavelength, of optical transmission and receiving devices (CH1)91<SB>1</SB>, 92<SB>1</SB>, ..., (CHn)91<SB>n</SB>, 92<SB>n</SB>for every wavelength to output an insertion wavelength, may also be provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical wavelength add / drop multiplexer and an optical wavelength division multiplexing transmission system.

  A conventional DWDM (Dense Wavelength Division Multiplexing) transmission system for dividing and transmitting optical wavelengths with high density will be described with reference to FIG. FIG. 11 shows a conventional optical wavelength add / drop multiplexer having the same configuration as that of Japanese Patent Application Laid-Open No. 2005-286721 of Patent Document 1, that is, a ROADM (Reconfigurable optical Add Drop Multiplexer). FIG. 2 is a device configuration diagram showing a device configuration of a branch wavelength multiplexing) terminal station device, among two directions of a direction 1 to a direction 2 or a direction 3 to a direction 4 of a direction 3 in a WEST direction and an EAST direction, A portion facing the ROADM terminal device in the EAST direction is shown. A DWDM transmission system is configured by connecting a plurality of such ROADM terminal stations.

As shown in FIG. 11, the EAST direction facing part of the conventional ROADM terminal apparatus includes a reception amplifying part (RX-AMP part) 121, a transmission amplifying part (in addition to the apparatus control / management part 10 and the wavelength monitoring part 20). TX-AMP unit) 212, optical multiplexers / demultiplexers 321, 412, optical wavelength separator 521, optical wavelength multiplexer 612, branch wavelength block unit 712, optical transceiver (CH1) 92 ₁ ,..., Optical transceiver (CHn) 92 _n .

  Next, the flow of optical signals from the EAST direction to the WEST direction of the ROADM terminal apparatus (B) will be described. The ROADM terminal device (B) receives the main signal from the optical fiber transmission line in the EAST direction by the reception amplification unit (RX-AMP unit) 121 having an optical amplification function, performs optical amplification, and performs the ROADM terminal station. Output in the EAST direction inside the device (B). An optical multiplexer / demultiplexer 321 is connected to the output of the reception amplification unit (RX-AMP unit) 121, and demultiplexes the branch wavelength and the pass wavelength.

The main signal demultiplexed in the branching direction by the optical multiplexer / demultiplexer 321 is demultiplexed into individual wavelengths (CH numbers) by the optical wavelength separator 521, and optical transceivers (CH1) 92 _{1 for} each individual wavelength. ... received by the optical transceiver (CHn) 92 _n . On the other hand, the main signal branched in the passing direction by the optical multiplexer / demultiplexer 321 is output as an output signal in the WEST direction to a branching wavelength block unit (not shown) having a transmission / cutoff function of an arbitrary wavelength. Any branch wavelength is blocked.

  Next, the flow of optical signals in the WEST direction → EAST direction of the ROADM terminal apparatus (B) will be described. Similarly, an input signal from the west direction opposite to the output signal in the west direction is input to the branch wavelength block unit 712 having a transmission / cutoff function of an arbitrary wavelength, and the branch wavelength is blocked. . Thereafter, the optical multiplexer / demultiplexer 412 performs multiplexing of the insertion wavelength output from the optical wavelength multiplexer 612 and outputs it to the transmission amplifier (TX-AMP unit) 212 having an optical amplification function. Note that control regarding transmission / blocking for each wavelength in the branch wavelength block unit 712 is set by the apparatus control / management unit 10.

Also, the insertion wavelength combined by the optical multiplexer / demultiplexer 412 is output from the optical transceiver (CH1) 92 ₁ ,..., The optical transceiver (CHn) 92 _{n for} each individual wavelength, and is input to the optical wavelength multiplexer 612. Then, optical wavelength multiplexing is performed, and the optical multiplexer / demultiplexer 412 multiplexes with the passing wavelength from the branch wavelength block unit 712. In addition, control regarding the output wavelength of the optical transceiver (CH1) 92 ₁ ,..., The optical transceiver (CHn) 92 _n is set by the apparatus control / management unit 10.

  The main signal optically amplified by the transmission amplifying unit (TX-AMP unit) 212 is output to the optical fiber transmission line in the EAST direction, and is output to the ROADM terminal station apparatus arranged oppositely.

JP 2005-286721 A (page 8-11)

  However, in the conventional DWDM transmission system, when an insertion wavelength of the same wavelength as the passing wavelength is inserted in the ROADM terminal device due to an erroneous connection of the optical patch cord or a transmission wavelength setting error of the transmitter / receiver, And the insertion wavelength cause interference to the main signal, which causes the following problems.

  The first problem is that it is not possible to prevent a situation in which the signals are combined when an insertion wavelength that is the same as the passing wavelength is input due to an erroneous connection of the optical patch cord or a setting error in the transmission wavelength of the optical transceiver. That is.

  The second problem is that it is not possible to prevent a failure in the main signal that occurs due to interference between the passing wavelength and insertion wavelength of the same wavelength after multiplexing.

  The third problem is that the insertion wavelength transmission / cutoff cannot be set remotely.

  The fourth problem is that at the time of changing the configuration of branching / insertion → passing of arbitrary wavelength or passing → branching / insertion, it is always necessary to go to the site to add an optical transceiver for the inserted wavelength, and to apply an optical patch. The cord must be connected.

  The present invention has been made in view of such problems, and the object of the present invention is to provide an insertion wavelength control function with an insertion wavelength misconnection / incorrect setting prevention function, thereby affecting the passing wavelength due to the insertion wavelength. It is an object to provide an optical wavelength add / drop multiplexer and an optical wavelength division multiplexing transmission system.

  In order to solve the above-described problems, the optical wavelength add / drop multiplexer according to the present invention employs the following characteristic configuration.

  (1) An optical wavelength add / drop device having an optical wavelength add / drop function of n wavelengths (n: an integer of 2 or more) and having an add / drop function that can be reconstructed for an arbitrary wavelength. An optical wavelength add / drop multiplexer including at least an insertion wavelength control function for controlling whether or not to multiplex an insertion wavelength of wavelengths.

  According to the optical wavelength add / drop multiplexer and the optical wavelength division multiplexing transmission system of the present invention, the following effects can be obtained.

  By providing an insertion wavelength control function that controls whether or not an insertion wavelength of an arbitrary wavelength is combined with a passing wavelength, it becomes possible to cut off the insertion wavelength of the same wavelength as the passing wavelength, and erroneously pass Even when the same wavelength as the wavelength is input as the insertion wavelength, it is possible to block the insertion wavelength and prevent the main signal transmitted by the passing wavelength from being damaged. Thus, when the same wavelength as the pass wavelength is input as the insertion wavelength due to an incorrect connection of the optical patch cord or a transmission wavelength setting error of the optical transceiver, interference between the pass wavelength and the insertion wavelength occurs after the multiplexing. Thus, it is possible to reliably avoid the conventional problem that the main signal failure occurs in the main signal receiving side ROADM terminal device.

It is an apparatus block diagram which shows an example of an apparatus structure of the optical wavelength add / drop device which concerns on this invention, ie, a ROADM terminal station apparatus. It is explanatory drawing for demonstrating the apparatus structure of the optical wavelength add / drop device shown in FIG. 1, ie, a ROADM terminal station apparatus. FIG. 11 is an explanatory diagram for explaining the flow of an optical signal when there is an erroneous connection of an optical patch cord or a setting error of a transmission wavelength of an optical transceiver in the conventional optical wavelength add / drop device, that is, a ROADM terminal device shown in FIG. It is. 1. Description of the optical signal flow in the case of an optical patch cord misconnection or an optical transmitter / receiver transmission wavelength setting error in the optical wavelength add / drop device according to the present invention shown in FIG. FIG. It is an apparatus block diagram which shows the other example of the apparatus structure of the optical wavelength add / drop device which concerns on this invention, ie, a ROADM terminal station apparatus. It is an apparatus block diagram which shows the further different example of the apparatus structure of the optical wavelength add / drop device which concerns on this invention, ie, a ROADM terminal station apparatus. 3 is a table showing a configuration example of a branch wavelength control information table held in the device control / management unit of the optical wavelength add / drop device of FIG. 1, that is, the ROADM terminal device, showing an example of the present invention. 3 is a table showing a configuration example of an insertion wavelength control information table held in a device control / management unit of the optical wavelength add / drop device of FIG. 1, that is, the ROADM terminal device, showing an example of the present invention. 7 is a table showing an example of the configuration of an optical transmitter / receiver output control information table held in the device control / management unit of the optical wavelength add / drop multiplexer of FIG. 6, that is, the ROADM terminal device, showing an example of the present invention. 7 is a table showing a configuration example of an optical transmitter / receiver selection control information table held in a device control / management unit of the optical wavelength add / drop device of FIG. 6, that is, the ROADM terminal device, showing an example of the present invention. It is an apparatus block diagram which shows the apparatus structure of the conventional optical wavelength adding / dropping apparatus, ie, a ROADM terminal station apparatus.

  Preferred embodiments of an optical wavelength add / drop multiplexer and an optical wavelength division multiplexing transmission system according to the present invention will be described below with reference to the accompanying drawings.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. The present invention relates to a general DWDM (Dense Wavelength Division Multiplexing) transmission system having an optical wavelength division multiplexing function of n wavelengths (n: an integer satisfying n ≧ 2) (that is, optical wavelengths of n wavelengths are divided and multiplexed with high density). Optical wavelength division multiplexing transmission system), an optical wavelength add / drop device having a reconfigurable add / drop function for an arbitrary wavelength, that is, a ROADM (Reconfigurable optical Add Drop Multiplexer) terminal station device, As an insertion wavelength control function for controlling whether or not an arbitrary wavelength is inserted, an insertion wavelength block having an insertion wavelength transmission / cutoff function for an arbitrary wavelength is provided. Prevents interference between the pass wavelength and insertion wavelength of the same wavelength due to misconnection or incorrect setting of the transmission wavelength of the optical transceiver. It is characterized by preventing the occurrence of a failure.

(Configuration of the embodiment)
FIG. 1 is an apparatus configuration diagram showing an example of an apparatus configuration of an optical wavelength add / drop multiplexer, that is, a ROADM terminal station apparatus according to the present invention, which is arranged in the WEST direction and the ROADM terminal station apparatus (A) arranged in the EAST direction. 2 shows the internal configuration of the ROADM terminal station apparatus (B) connected to each of the ROADM terminal station apparatuses (C) by an optical fiber transmission line. That is, in FIG. 1, a ROADM terminal station (B) is a DWDM transmission system having a ROADM function by a ROADM terminal station (A) connected in the WEST direction and a ROADM terminal station (C) connected in the EAST direction. Is configured. The internal configurations of the ROADM terminal device (A) and the ROADM terminal device (C) are the same as those of the ROADM terminal device (B).

The optical wavelength add / drop device shown in FIG. 1, that is, the ROADM terminal device (B), is the same as the conventional optical wavelength add / drop device shown in FIG. The EAST direction facing portion facing the station apparatus (C) includes a reception amplification unit (RX-AMP unit) 121, a transmission amplification unit (TX-AMP unit) 212, optical multiplexer / demultiplexers 321, 412, an optical wavelength separator 521, An optical wavelength multiplexer 612, a branch wavelength block unit 712, an optical transceiver (CH1) 92 ₁ ,..., An optical transceiver (CHn) 92 _n are provided, and an insertion wavelength of an arbitrary wavelength is combined with a passing wavelength. An insertion wavelength block unit 812 is provided as an insertion wavelength control function for controlling whether or not to perform this.

On the other hand, for the WEST direction facing portion facing the ROADM terminal apparatus (A), similarly, the reception amplification unit (RX-AMP unit) 112, the transmission amplification unit (TX-AMP unit) 221, the optical multiplexer / demultiplexer 312, 421, an optical wavelength separator 512, an optical wavelength multiplexer 621, a branch wavelength block unit 721, an optical transceiver (CH1) 91 ₁ ,..., An optical transceiver (CHn) 91 _n , and further arbitrary for the passing wavelength An insertion wavelength block unit 821 is provided as an insertion wavelength control function for controlling whether or not the insertion wavelengths of the two wavelengths are combined.

  Next, the flow of optical signals in the WEST direction → EAST direction of the ROADM terminal apparatus (B) will be further described. The ROADM terminal device (B) receives a main signal from the optical fiber transmission line in the west direction by a reception amplification unit (RX-AMP unit) 112 having an optical amplification function, performs optical amplification, and performs a ROADM terminal station. Output in the EAST direction inside the device (B). An optical multiplexer / demultiplexer 312 is connected to the output of the reception amplification unit (RX-AMP unit) 112, and demultiplexes the branch wavelength and the pass wavelength.

The main signal demultiplexed in the branching direction by the optical multiplexer / demultiplexer 312 is demultiplexed into individual wavelengths (CH numbers) by the optical wavelength separator 512, and optical transceivers (CH1) 91 _{1 for} each individual wavelength. ... received by the optical transceiver (CHn) 91 _n .

  On the other hand, the main signal branched in the passing direction by the optical multiplexer / demultiplexer 312 is output to the branch wavelength block unit 712 having a transmission / cutoff function of an arbitrary wavelength, and after the branch wavelength is blocked, the optical multiplexer / demultiplexer At 412, the insertion wavelength output from the optical wavelength multiplexer 612 is combined via the insertion wavelength block unit 812, and output to the transmission amplification unit (TX-AMP unit) 212 having an optical amplification function. Note that control regarding transmission / blocking for each wavelength in the branch wavelength block unit 712 is set by the apparatus control / management unit 10.

Also, the insertion wavelength combined by the optical multiplexer / demultiplexer 412 is output from the optical transceiver (CH1) 92 ₁ ,..., The optical transceiver (CHn) 92 _{n for} each individual wavelength, and is input to the optical wavelength multiplexer 612. Then, optical wavelength multiplexing is performed, and it is combined with the pass wavelength from the branch wavelength block unit 712 by the optical multiplexer / demultiplexer 412 via the insertion wavelength block unit 812 having a transmission / cutoff function of an arbitrary wavelength. . In addition, control regarding the output wavelength of the optical transceiver (CH1) 92 ₁ ,..., The optical transceiver (CHn) 92 _n is set by the apparatus control / management unit 10. Further, the control / management unit 10 also sets control regarding transmission / cutoff for each wavelength in the insertion wavelength block unit 812.

  By setting the insertion wavelength block unit 812 to block all insertion wavelengths of arbitrarily designated wavelengths under the control of the device control / management unit 10, the same wavelength as the pass wavelength is erroneously input as the insertion wavelength. Even in this case, it is possible to block the insertion wavelength and prevent the main signal transmitted by the passing wavelength from being damaged.

  The main signal optically amplified by the transmission amplifying unit (TX-AMP unit) 212 is output to the optical fiber transmission line in the EAST direction, and is output to the ROADM terminal device (C) arranged oppositely.

  The wavelength monitor unit 20 has a function of monitoring an optical level for each individual wavelength in the optical wavelength multiplexed signal, and includes a reception amplification unit (RX-AMP unit) 112 and a transmission amplification unit (TX-AMP unit) 212. , By monitoring the output of each of the reception amplification unit (RX-AMP unit) 121 and the transmission amplification unit (TX-AMP unit) 221, the optical level of the individual wavelength is detected and alarm monitoring (generation of OSC control information, The OSC control information is transmitted / received to / from the opposite device).

  The flow of the optical signal in the WEST direction → EAST direction of the ROADM terminal apparatus (B) has been described above, but the flow of the optical signal in the EAST direction → WEST direction of the ROADM terminal apparatus (B) is also in the WEST direction → EAST. This is exactly the same as the case of the direction, and a duplicate description is omitted here.

  Next, the device configuration of the ROADM terminal device (B) in FIG. 1 will be further described with reference to FIG. 2, focusing on the portion facing the ROADM terminal device in the EAST direction. Here, the portion facing the ROADM terminal device (C) in the EAST direction will be described, but the same is true for the portion facing the ROADM terminal device (A) in the WEST direction. FIG. 2 is an explanatory diagram for explaining the device configuration of the optical wavelength add / drop device shown in FIG. 1, that is, the ROADM terminal device. In one embodiment of the present invention, in the DWDM transmission system using the ROADM terminal device. 2 shows a configuration example of a ROADM terminal device for realizing an add / drop function and an inserted wavelength blocking function.

  In FIG. 2, an input signal from the WEST direction is input to the branch wavelength block unit 712. As described above, the branch wavelength block unit 712 has a transmission / cutoff function of an arbitrary wavelength, and blocks the branch wavelength and transmits the pass wavelength according to the setting of the branch wavelength block control from the device control / management unit 10. Let

On the other hand, the optical transmitter / receiver (CH1) 92 ₁ ,..., The optical transmitter / receiver (CHn) 92 _n are connected to the optical wavelength multiplexer 612 by an optical patch cord and output a wavelength set by the device control / management unit 10. To do. The insertion wavelength is output from the optical transceiver (CH1) 92 ₁ ,..., The optical transceiver (CHn) 92 _n, and after the optical wavelength multiplexing is performed by the optical wavelength multiplexer 612, it passes through the insertion wavelength block unit 812. Then, the signal is input to the optical multiplexer / demultiplexer 412, and is combined with the pass wavelength from the branch wavelength block unit 712 by the optical multiplexer / demultiplexer 412.

  Here, the apparatus control / management unit 10 has a branch wavelength control information table 11 for each CH number as shown in FIG. 7, and branches according to the control information set in the branch wavelength control information table 11. Transmission / cutoff of each wavelength passing through the wavelength block unit 712 is set.

  FIG. 7 is a table showing a configuration example of the branch wavelength control information table 11 held in the device control / management unit 10 of the optical wavelength add / drop device of FIG. Information on number 11a, direction 11b, branch / insert / pass type 11c, and transmitter / receiver registration information 11d for registering an optical transmitter / receiver to be branched / inserted is set.

In the example shown in FIG. 7, as shown in the drop / insert / pass type 11c, the CH1 shown in the CH number 11a is dropped / inserted in both the WEST direction and the EAST direction, and the target optical transceiver is set in the WEST direction. It is set that the optical transceiver W1, that is, the optical transceiver (CH1) 91 ₁ , and the EAST direction is the optical transceiver E1, that is, the optical transceiver (CH1) 92 ₁ , and other CH numbers are passed. Is set.

  When control as shown in FIG. 7 is performed, the control signal for the insertion wavelength block unit 812 of the device control / management unit 10 can pass the optical wavelength of CH1, but the light of other CH numbers The wavelength needs to be set to block.

  Next, with reference to FIG. 3, a description will be given of a case where there is an erroneous connection of an optical patch cord or a setting error of a transmission wavelength of an optical transceiver in the conventional optical wavelength add / drop device shown in FIG. 11, that is, a ROADM terminal device. . FIG. 3 explains the flow of an optical signal when there is an erroneous connection of an optical patch cord or a setting error of a transmission wavelength of an optical transceiver in the conventional optical wavelength add / drop device shown in FIG. 11, that is, a ROADM terminal device. It is explanatory drawing for.

In FIG. 3, the branch wavelength block unit 712 controls only the branch signal of CH1 and controls the device control / management unit 10 to transmit the optical signals of other CH numbers toward the optical multiplexer / demultiplexer 412. Suppose that it is controlled by information. In spite of performing such control, the optical transceiver (CH1) 92 ₁ ,..., The optical transceiver (CHn) 92 _n are not connected due to an erroneous connection of the optical patch cord or a transmission wavelength setting error of the optical transceiver. Among them, when the insertion wavelength of the optical transceiver (CHn) 92 _n having the same wavelength as the passing wavelength of CHn is inserted and multiplexed by the optical multiplexer / demultiplexer 412, after multiplexing in the optical multiplexer / demultiplexer 412, Interference between the passing wavelength and the insertion wavelength occurs, and the opposite device in the EAST direction that receives the main signal via the transmission amplifier (TX-AMP unit) 212 and the optical fiber transmission line, that is, the ROADM terminal device (C) In this case, a failure of the main signal occurs.

  Next, with reference to FIG. 4, a description will be given of a case where there is an erroneous connection of an optical patch cord or a setting error of the transmission wavelength of an optical transceiver in the optical wavelength add / drop device according to the present invention shown in FIG. To do. FIG. 4 explains the flow of an optical signal when there is an erroneous connection of an optical patch cord or a setting error of the transmission wavelength of an optical transceiver in the optical wavelength add / drop device, that is, the ROADM terminal device shown in FIG. It is explanatory drawing for doing.

In FIG. 4, as shown in FIG. 7, the branch wavelength block unit 712 blocks only the CH1 branch signal and transmits the other CH number branch signals toward the optical multiplexer / demultiplexer 412. It is assumed that control is performed based on control information from the management unit 10. In such a case, the setting error of the transmission wavelength of erroneous connection or the optical transceiver of the optical patch cord or the like, an optical transceiver (CH1) 92 _{1, ...,} the optical transceiver (CHn) of the 92 _n, and passing the wavelength of CHn Even when the insertion wavelength of the optical transceiver (CHn) 92 _{n having} the same wavelength is about to be inserted by the optical multiplexer / demultiplexer 412, the insertion wavelength block information 812 is inserted into the insertion wavelength block information unit 812. Thus, it is possible to set so as to block the insertion wavelength (CHn) of the optical transceiver (CHn) 92 _n .

  The apparatus control / management unit 10 has an insertion wavelength control information table 12 for each CH number as shown in FIG. 8, and the insertion wavelength block unit according to the control information set in the insertion wavelength control information table 12. Set transmission / cutoff of each wavelength passing through 812.

  FIG. 8 is a table showing a configuration example of the insertion wavelength control information table 12 held in the apparatus control / management unit 10 of the optical wavelength add / drop multiplexer of FIG. Number 12 a, direction 12 b, branch / insert / pass type 12 c, transmitter / receiver registration information 12 d for registering an optical transmitter / receiver to be branched / inserted, and information on insert wavelength block control information 12 e indicating the control content of the insert wavelength block unit 812 Is set.

In the example shown in FIG. 8, corresponding to the branch wavelength control information table 11 shown in FIG. 7, as shown in the branch / insertion / passage type 12c, both the WEST direction and the EAST direction are branched for CH1 indicated by the CH number 12a. The target optical transceiver is set so that the WEST direction is the optical transceiver W1, that is, the optical transceiver (CH1) 91 ₁ , and the EAST direction is the optical transceiver E1, that is, the optical transceiver (CH1) 91 ₁ The other CH numbers are set to pass through.

In addition, due to erroneous connection of the optical patch cord or setting error of the transmission wavelength of the optical transceiver, the insertion wavelength of the optical transceiver (CHn) 91 _n to be inserted into the optical multiplexer / demultiplexer 421 in the WEST direction or the optical multiplexing in the EAST direction In order to block the insertion wavelength of the optical transceiver (CHn) 92 _n to be inserted into the demultiplexer 412, the insertion wavelength block control information 12 e contains “blocking” unlike “transmission” of other CH numbers. Is set.

  The apparatus control / management unit 10 performs optical multiplexing / demultiplexing by controlling the insertion wavelength block units 812 and 821 to block the insertion wavelength (CHn) based on the control information in the wavelength control information table 12 of FIG. It is possible to prevent the insertion wavelength (CHn) from interfering with the passing wavelength (CHn) in the units 412 and 421.

As described above, the configuration of the optical wavelength add / drop device of FIG. 1 showing an example of the present invention, that is, the ROADM terminal device, has been described in detail, but the optical wavelength multiplexers 612 and 621, the optical wavelength separators 512 and 521 of FIG. Each of the optical multiplexers / demultiplexers 312, 321, 412, 421, the reception amplification units (RX-AMP units) 112, 121, and the transmission amplification units (TX-AMP units) 212, 221 are well known to those skilled in the art. In addition, since the circuit is not directly related to the present invention, a detailed description thereof will be omitted here.
(Description of operation of embodiment)

  2 and FIG. 4 and the control information tables of FIGS. 7 and 8, the optical wavelength add / drop device of this embodiment shown in FIG. 1, that is, the ROADM terminal device, relates to optical signals in the WEST direction → EAST direction. An operation example will be further described below.

(1) First, the device control / management unit 10 controls the branching / inserting / passing for each CH number in the branching wavelength block units 712 and 721 and the insertion wavelength block units 812 and 821 in accordance with the setting from the user. Are set in the branch wavelength control information table 11 of FIG. 7 and the insertion wavelength control information table 12 of FIG.
(2) Thereafter, in FIG. 2, an input signal from the WEST direction is input to the branch wavelength block unit 712.

(3) The apparatus control / management unit 10 sets the transmission / cutoff state of each wavelength input to the branch wavelength block unit 712 according to the control information set in the branch wavelength control information table 11 of FIG. Note that the control information for the device control / management unit 10 to control the branch wavelength block unit 712, that is, the control information in the branch wavelength control information table 11 of FIG.
(4) The branch wavelength block unit 712 performs an operation of blocking each branch wavelength for each CH number and transmitting the pass wavelength according to the setting of the transmission / cutoff state of each wavelength from the device control / management unit 10.

(5) The passing wavelength from the branch wavelength block unit 712 is input to the optical multiplexer / demultiplexer 412 for multiplexing the insertion wavelength.
(6) The optical transceiver (CH1) 92 ₁ ,..., The optical transceiver (CHn) 92 _n outputs the optical wavelength of the CH number set by the device control / management unit 10. The apparatus control / management unit 10 may arbitrarily set control information for controlling the optical wavelength output of the optical transceiver (CH1) 92 ₁ ,..., The optical transceiver (CHn) 92 _n remotely. Is possible.

(7) The optical wavelengths output from the optical transceivers (CH1) 92 ₁ ,..., The optical transceiver (CHn) 92 _n are input to the optical wavelength multiplexer 612 connected by the optical patch cord, and the optical wavelength Is multiplexed.

  (8) The optical wavelength multiplexed optical signal is input as an insertion wavelength via the insertion wavelength block unit 812 to the optical multiplexer / demultiplexer 412, and the optical multiplexer / demultiplexer 412 outputs the signal from the branch wavelength block unit 712. Combined with the pass wavelength.

(9) Here, when the insertion wavelength block unit 812 is not used as in the conventional optical wavelength add / drop multiplexer, that is, the ROADM terminal equipment shown in FIG. , Optical transmitter / receiver (CH1) 92 ₁ ,..., An insertion wavelength of the same wavelength with respect to the passing wavelength (CHn) from the branch wavelength block unit 712 due to a transmission wavelength setting error of the optical transmitter / receiver (CHn) 92 _n When (CHn) has been inserted via the insertion wavelength block unit 812, after being multiplexed by the optical multiplexer / demultiplexer 412, interference between the pass wavelength and the insertion wavelength occurs.

  (10) When the interference between the passing wavelength (CHn) and the insertion wavelength (CHn) occurs in the passing ROADM terminal station as in (9) in the previous section, the receiving side ROADM terminal arranged in the EAST direction In the station apparatus, a failure of the main signal transmitted as the passing wavelength (CHn) from the branch wavelength block unit 712 occurs.

(11) On the other hand, when the insertion wavelength block unit 812 is used like the optical wavelength add / drop device of FIG. , According to the insertion wavelength control information table 12 of FIG. 8, an optical patch cord misconnection or transmission of the optical transceiver (CH1) 92 ₁ ,..., Optical transceiver (CHn) 92 _n is transmitted to the inserted wavelength block unit 812. It is possible to set the cutoff of the erroneously input insertion wavelength (CHn) due to a wavelength setting error or the like. Note that the control information for the device control / management unit 10 to control the insertion wavelength block unit 812, that is, the control information in the insertion wavelength control information table 12 in FIG. 8, can be arbitrarily set from a remote location.

  (12) Therefore, as shown in FIG. 4, even if the insertion wavelength (CHn) is likely to be inserted into the optical multiplexer / demultiplexer 412, an insertion wavelength of an arbitrary wavelength is multiplexed with respect to the passing wavelength. The insertion wavelength block unit 812 arranged as an insertion wavelength control function for controlling whether or not to cause the insertion wavelength (CHn) to be erroneously input is cut off, and after the multiplexing in the optical multiplexer / demultiplexer 412, the passing wavelength (CHn) And the insertion wavelength (CHn) can be prevented from interfering with each other.

(Explanation of effect of embodiment)
As described in detail above, in the present embodiment, the following effects can be achieved.

  The first effect is that, as an insertion wavelength control function for controlling whether or not an insertion wavelength of an arbitrary wavelength is combined with a passing wavelength, insertion wavelength block units 812 and 821 having a transmission / cutoff function of an arbitrary wavelength. If the insertion wavelength of the same wavelength as the pass wavelength is erroneously inserted into the optical multiplexers / demultiplexers 412 and 421, the insertion wavelength of the same wavelength as the pass wavelength is blocked. It is possible to prevent the insertion wavelength having the same wavelength as the passing wavelength from being erroneously combined.

  As described in the first effect, the second effect prevents the insertion wavelength from being erroneously input to the optical multiplexers / demultiplexers 412 and 421. Therefore, the optical multiplexers / demultiplexers 412 and 421 pass the same wavelength. It is possible to prevent damage to the main signal that occurs due to interference between the wavelength and the insertion wavelength after multiplexing.

  A third effect is that transmission / cutoff of the insertion wavelength in the insertion wavelength block units 812 and 821 can be set remotely via the apparatus control / management unit 10.

The fourth effect is that between the optical transceiver (CH1) 91 ₁ ,..., Between the optical transceiver (CHn) 91 _n and the optical wavelength multiplexer 621 and the optical wavelength separator 512, the optical transceiver (CH1) 92 ₁ , ..., the optical transceiver (CHn) 92 _n , the optical wavelength multiplexer 612, and the optical wavelength separator 521 are connected in advance by an optical patch cord to appropriately pass / block the branch wavelength and the insertion wavelength. If it is set in a possible state, for example, the control information in the branch wavelength control information table 11 and the insertion wavelength control information table 12 is appropriately changed from a remote location, so that the branch wavelength block units 712 and 721 and the insertion wavelength block unit 812 are changed. , 821 can be changed as needed from a remote location without having to go to the site where the optical wavelength add / drop device, that is, the ROADM terminal device is installed. Branch / insertion → pass wavelength of, or is to be able to change the configuration of the passage → the branch / insertion.

(Other embodiments of the present invention)
As another embodiment of the present invention, the basic configuration is the same as that of the above-described embodiment, but another example in which the insertion wavelength transmission / cutoff method is devised will be described.

First, as another embodiment, in the configuration of the optical wavelength add / drop device shown in FIG. 5, that is, the ROADM terminal device, instead of the optical wavelength add / drop device 812, 821 in the optical wavelength add / drop device shown in FIG. In addition, variable attenuators (CH1) 101 ₁ , 102 ₁ ,..., Variable attenuators (CHn) 101 _n , 102 _n are used as an insertion wavelength control function. FIG. 5 is an apparatus configuration diagram showing another example of the apparatus configuration of the optical wavelength add / drop multiplexer, that is, the ROADM terminal apparatus according to the present invention. The optical wavelength multiplexers 612 and 621 have variable attenuators (CH1) for each individual wavelength. ) 101 ₁ , 102 ₁ ,..., Variable attenuators (CHn) 101 _n , 102 _n are combined, and the respective attenuation amounts are arbitrarily set from the apparatus control / management unit 10, thereby allowing the transmission / cutoff of the inserted wavelength. The example which implement | achieves a function is shown.

5, a variable attenuator (CH1) 101 _1, ..., a variable attenuator (CHn) 101 _n, the optical transceiver (CH1) 92 _1, ..., the optical transceiver (CHn) 92 _n attenuate the respective output levels And output to the optical wavelength multiplexer 612 as an insertion wavelength. The variable attenuator (CH1) 102 _1, ..., a variable attenuator (CHn) 102 _n, the optical transceiver (CH1) 91 _1, ..., and the optical transceiver to (CHn) 91 _n each output level is attenuated , And output as an insertion wavelength to the optical wavelength multiplexer 621. That is, the variable attenuator (CH1) 101 ₁ ,..., The variable attenuator (CHn) 101 _n so that the insertion wavelength (CHn) having the same wavelength as the pass wavelength (CHn) is not output to the optical wavelength multiplexers 612 and 621. Alternatively, among the variable attenuators (CH1) 102 ₁ ,..., The variable attenuators (CHn) 102 _n , the attenuation amount of the variable attenuators (CHn) 101 _n and 102 _n corresponding to the insertion wavelength (CHn) is large. By setting the value, the optical multiplexer / demultiplexers 412 and 421 prevent the insertion wavelength (CHn) of the same wavelength from being combined with the pass wavelength (CHn), and thus after the combination, The function of transmitting / blocking the insertion wavelength can be realized without affecting the main signal.

As shown in FIG. 6, as an insertion wavelength control function, an optical transceiver (CH1) 91 ₁ ,..., An optical transceiver (CHn) 91 _n or an optical transceiver (CH1) 92 ₁ ,. CHn) 92 _n is provided with an output permission / output stop function for individual wavelengths, and is controlled by the device control / management unit 10 according to the optical transceiver output control information table of FIG. It may be realized. FIG. 6 is an apparatus configuration diagram showing still another example of the apparatus configuration of the optical wavelength add / drop multiplexer, that is, the ROADM terminal apparatus according to the present invention. In order to control the output of the insertion wavelength combined with the pass wavelength, The example which controls the output of the optical transmitter / receiver for every wavelength is shown.

In FIG. 6, the device control / management unit 10 has an optical transceiver output control information table 13 for each CH number as shown in FIG. 9, and is set in the optical transceiver output control information table 13. according to the control information, the optical transceiver (CH1) 91 _1, ..., the optical transceiver (CHn) 91 _n and an optical transceiver (CH1) 92 _1, ..., the optical transceiver (CHn) output enable of each wavelength from the 92 _n / Set output stop.

FIG. 9 is a table showing a configuration example of the optical transmitter / receiver output control information table 13 held in the device control / management unit 10 of the optical wavelength add / drop multiplexer of FIG. 6, that is, the ROADM terminal device, showing an example of the present invention. , CH number 13a, direction 13b, branch / insert / pass type 13c, transmitter / receiver registration information 13d for registering an optical transmitter / receiver to be branched / inserted, optical transmitter / receiver (CH1) 91 ₁ ,..., Optical transmitter / receiver (CHn ) 91 _n and optical transmitter / receiver (CH1) 92 ₁ ,..., Information related to output stop control information 13e indicating output permission / output stop of the optical transmitter / receiver (CHn) 92 _n is set.

In the example shown in FIG. 9, as shown in the branching / insertion / passing type 13c, branching / insertion is performed in both the WEST direction and the EAST direction with respect to CH1 indicated by the CH number 13a, and the target optical transceiver is in the WEST direction. It is set that the optical transceiver W1, that is, the optical transceiver (CH1) 91 ₁ , and the EAST direction is the optical transceiver E1, that is, the optical transceiver (CH1) 92 ₁ , and other CH numbers are passed. Is set.

In addition, an optical transmitter / receiver (CHn) of an insertion wavelength (CHn) to be inserted from the optical wavelength multiplexer 621 in the WEST direction into the optical multiplexer / demultiplexer 421 due to an erroneous connection of the optical patch cord or a setting error of the transmission wavelength of the optical transmitter / receiver. In order to stop the output from the optical transceiver (CHn) 92 _{n of the} insertion wavelength (CHn) to be inserted into the optical multiplexer / demultiplexer 412 from the optical wavelength multiplexer 612 in the CHn) 91 _n or the optical wavelength multiplexer 612 in the EAST direction, Unlike the “output” of other CH numbers, “stop” is set in the output stop control information 13e.

The device control / management unit 10, based on the control information in the optical transceiver output control information table 13 of FIG. 9, the wavelength (CHn) to be inserted from the optical wavelength multiplexers 612 and 621 into the optical multiplexer / demultiplexers 412 and 421. The optical multiplexers / demultiplexers 412 and 421 insert the same wavelength (CHn) with respect to the passing wavelength (CHn) by controlling the output from the optical transceivers (CHn) 91 _n and 92 _n to be stopped. Can be prevented from being combined.

Alternatively, in the apparatus configuration as shown in FIG. 6, instead of the optical transceiver output control information table 13 shown in FIG. 9, the optical transmission / reception for controlling the wavelength setting operation to the optical transceiver for each wavelength as shown in FIG. The device selection control information table 14 is provided in the device control / management unit 10 as an insertion wavelength control function, and a function that makes it impossible to set the optical transceiver by selecting the same wavelength as the pass wavelength is combined. Thus, the insertion wavelength having the same wavelength as the pass wavelength may be prevented from being combined. That is, the device control / management unit 10 includes optical transceivers (CH1) 91 ₁ ,..., Optical transceivers (CHn) 91 _n , optical transceivers (CH1) 92 ₁ ,..., Optical transceivers (CHn) 92 _n . When selecting the wavelength, that is, the CH number, set in the optical transceiver, the wavelength, which is the same as the passing wavelength, is selected by selecting the wavelength, that is, the CH number, based on the control information in the optical transceiver selection control information table 14 of FIG. The optical transceiver cannot be set.

  FIG. 10 is a table showing a configuration example of the optical transceiver selection control information table 14 held in the device control / management unit 10 of the optical wavelength add / drop device of FIG. 6, that is, the ROADM terminal device of FIG. Information related to the optical transceiver 14a, the direction 14b, and the CH number setting information 14c is set. Here, a CH number option 14d capable of selecting a wavelength, that is, a CH number, is set and registered in advance, and one of the wavelengths, that is, the CH number is selected from the CH number option 14d, and the optical transceiver is selected. The CH number can be set in the CH number setting information 14c.

In the example shown in FIG. 10, as shown in the optical transmitter / receiver 14a, the optical transmitter / receiver W (n-1) of the wavelength of the CH number (n-1), that is, the optical transmitter / receiver (CH (n-1)) 91 _{(n -1) Since} the wavelength of the optical transceiver E (n-1), that is, the optical transceiver (CH (n-1)) 92 _(n-1) is unregistered, the CH number option 14d includes the wavelength, Information indicating that selection of CH (n-1) is not possible is set, and an optical transceiver Wn having the same wavelength as the passing wavelength (CHn), that is, an optical transceiver (CHn) 91 _n , an optical transceiver En. That is, for the wavelength of the optical transceiver (CHn) 92 _n , information indicating that selection is not possible is set in the CH number option 14d.

The device control / management unit 10 can not only select an unregistered wavelength, that is, a CH number, based on the control information in the optical transceiver selection control information table 14 in FIG. Since the same wavelength as the passing wavelength (CHn) cannot be selected and set as the optical transceiver (CHn) 91 _n or the optical transceiver (CHn) 92 _n , the same wavelength (CHn) as the passing wavelength (CHn) Can be blocked, and the optical multiplexer / demultiplexers 412 and 421 can prevent the insertion wavelength (CHn) having the same wavelength from being combined with the pass wavelength (CHn).

The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention. For example, the embodiment of the present invention can be expressed as the following configuration in addition to the configuration (1) in the means for solving the problems.
(2) The optical wavelength add / drop device according to (1), wherein the insertion wavelength control function controls the insertion wavelength having the same wavelength as the pass wavelength so as not to be combined with the pass wavelength.
(3) As the insertion wavelength control function, an insertion wavelength block means for transmitting or blocking an insertion wavelength of an arbitrary wavelength is provided before the optical multiplexing / demultiplexing means for multiplexing with the passing wavelength (1) ) Or (2).
(4) The above-described (1) or (1), wherein the insertion wavelength control function includes variable attenuation means for variably attenuating an insertion wavelength of an arbitrary wavelength before the optical multiplexing / demultiplexing means for multiplexing with the passing wavelength. (2) Optical wavelength add / drop multiplexer.
(5) As the insertion wavelength control function, an optical transmitter / receiver output control means for permitting or stopping output from an optical transmitter / receiver having an arbitrary wavelength among optical transmitters / receivers for each wavelength outputting the insertion wavelength is provided. (1) or (2).
(6) The optical wavelength according to (1) or (2), further comprising: an optical transceiver selection control unit that arbitrarily selects and sets a wavelength of an optical transceiver that outputs the insertion wavelength as the insertion wavelength control function. Branch and insert device.
(7) The optical wavelength add / drop device according to any one of (1) to (6), further comprising device control / management means for remotely controlling the insertion wavelength control function.
(8) The optical wavelength add / drop unit according to (7), wherein the device control / management unit includes a control information table in which control information for controlling the insertion wavelength control function for each wavelength is arbitrarily registered in advance. apparatus.
(9) In an optical wavelength division multiplex transmission system that transmits an optical wavelength of n wavelengths (n: an integer of 2 or more) with high density division multiplexing, as an optical wavelength add / drop multiplexer constituting the optical wavelength division multiplex transmission system An optical wavelength division multiplexing transmission system using the optical wavelength add / drop multiplexer of any one of (1) to (8) above.

DESCRIPTION OF SYMBOLS 10 Device control / management part 11 Branch wavelength control information table 11a CH number 11b Direction 11c Branch / insertion / passage type 11d Transmitter / receiver registration information 12 Insertion wavelength control information table 12a CH number 12b Direction 12c Branch / insertion / passage type 12d Registration information 12e Insertion wavelength block control information 13 Optical transceiver output control information table 13a CH number 13b Direction 13c Branch / insertion / passage type 13d Transceiver registration information 13e Output stop control information 14 Optical transceiver selection control information table 14a Optical transceiver 14b Direction 14c CH number setting information 14d CH number option 20 Wavelength monitor unit 112 Reception amplification unit (RX-AMP unit)
121 Reception amplification unit (RX-AMP unit)
212 Transmission Amplifier (TX-AMP Unit)
221 Transmission amplifier (TX-AMP unit)
312 Optical multiplexer / demultiplexer 321 Optical multiplexer / demultiplexer 412 Optical multiplexer / demultiplexer 421 Optical multiplexer / demultiplexer 512 Optical wavelength separator 521 Optical wavelength separator 612 Optical wavelength multiplexer 621 Optical wavelength multiplexer 712 Branch wavelength block unit 812 Insert wavelength block unit 821 add wavelength block portion ₉₁ 1, ..., _{91 n} optical transceivers ₉₂ 1, ..., _{92 n} optical transceivers ₁₀₁ 1, ..., _{101 n} variable attenuators ₁₀₂ 1, ..., _{102 n} variable attenuator

Claims (9)

  An optical wavelength add / drop device having an optical wavelength add / drop function of n wavelengths (n: an integer of 2 or more) and having an add / drop function that can be reconstructed for an arbitrary wavelength, and inserting an arbitrary wavelength with respect to a passing wavelength An optical wavelength add / drop multiplexer comprising at least an insertion wavelength control function for controlling whether or not to combine wavelengths.   2. The optical wavelength add / drop device according to claim 1, wherein the insertion wavelength control function controls the insertion wavelength that is the same as the pass wavelength so as not to be combined with the pass wavelength. 3.   The insertion wavelength control function includes an insertion wavelength block means for transmitting or blocking an insertion wavelength of an arbitrary wavelength before an optical multiplexing / demultiplexing means for multiplexing with the passing wavelength. Item 3. The optical wavelength add / drop device according to Item 1 or 2.   The variable wavelength attenuation means for variably attenuating an insertion wavelength of an arbitrary wavelength is provided before the optical multiplexing / demultiplexing means for multiplexing with the passing wavelength as the insertion wavelength control function. Or the optical wavelength add / drop device according to 2.   As the insertion wavelength control function, an optical transmitter / receiver output control means for permitting or stopping output from an optical transmitter / receiver of any wavelength among optical transmitters / receivers for each wavelength outputting the insertion wavelength is provided. The optical wavelength add / drop device according to claim 1 or 2, characterized in that:   3. The light according to claim 1, further comprising: an optical transceiver selection control unit that arbitrarily selects and sets a wavelength of an optical transceiver that outputs the insertion wavelength as the insertion wavelength control function. Wavelength add / drop multiplexer.   7. The optical wavelength add / drop device according to claim 1, further comprising device control / management means for remotely controlling the insertion wavelength control function.   8. The light according to claim 7, wherein the device control / management means includes a control information table in which control information for controlling the insertion wavelength control function for each wavelength is arbitrarily registered in advance. Wavelength add / drop multiplexer.   An optical wavelength division multiplexing transmission system that transmits an optical wavelength of n wavelengths (n: integer greater than or equal to 2) with high density division multiplexing, and as an optical wavelength add / drop multiplexer that constitutes the optical wavelength division multiplexing transmission system, An optical wavelength division multiplexing transmission system using the optical wavelength add / drop multiplexer according to any one of 1 to 8.

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