JP4704367B2 - Optical wavelength division multiplexing equipment - Google Patents

Description

  The present invention sends an optical wavelength division multiplexed signal obtained by converting and multiplexing optical signals of a plurality of systems having a data transmission rate of 10 Gbps or higher to different wavelengths, to the optical wavelength division multiplexing transmission line. The present invention relates to an optical wavelength multiplex transmission apparatus that demultiplexes an optical wavelength multiplexed signal received via the optical signal, converts the separated optical signals of different wavelengths to return to the original wavelength, and sends the converted signals to each system.

  Various high-speed data transmission devices using optical signals have already been proposed and put into practical use. Also, optical wavelength multiplex transmission that converts multiple systems of optical signals to different wavelengths and multiplexes them, transmits this optical wavelength multiplexed signal, and separates it to wavelength corresponding to the receiving side and returns it to the wavelength corresponding to each system. An apparatus is also known (see, for example, Patent Document 1). There has also been proposed means for separating an optical wavelength multiplexed signal in an optical wavelength division multiplexing transmission system in accordance with the wavelength and performing an optical spectrum analysis or the like (for example, see Patent Document 2).

  Further, as described above, the optical wavelength division multiplexing transmission device has a configuration in which a plurality of optical signals are converted into different wavelengths, multiplexed and transmitted, and the received optical wavelength division multiplexed signal is wavelength-separated, for example, The configuration shown in FIG. 5 is known. In the figure, 100A and 100B are optical wavelength division multiplexing transmission devices (WDM (Wavelength Division Multiplexing) devices), 101 is an optical wavelength division multiplexing transmission path, 102A and 102B are 10G interface boards for performing 10 Gbps data transmission / reception processing, 103A , 103B are wavelength multiplexing / demultiplexing boards, 104A and 104B are multiplexing units composed of packages A to H, 105A and 105B are demultiplexing units composed of packages A to H, 106A and 106B are transmitting units, 107A and 107B are receiving units, 108A, Reference numeral 108B denotes a control panel.

  The optical wavelength multiplex transmission apparatuses 100A and 100B are shown close to each other, but are arranged at a desired distance interval, and are connected to each other by the optical wavelength multiplex transmission line 101. In this case, it is possible to provide means for relay amplification transmission using an optical amplifier. Also, the transmitter and receiver on the NTWK (network) side of the 10G interface boards 102A and 102B are connected to the optical wavelength division multiplexing transmission line 101 for transmitting the optical wavelength division multiplexed signal via the wavelength multiplexing and demultiplexing boards 103A and 103B. The transmission side and the reception unit on the CLNT (client) side indicate a client side (for example, Ethernet (registered trademark) side) that transmits a single wavelength optical signal. The multiplexing units 104A and 104B convert the optical signals from the plurality of client-side transmission units of the 10G interface boards 102A and 102B into different wavelengths and multiplex them into optical wavelength multiplexed signals. The transmission units 106A and 106B To the optical wavelength multiplexing transmission line 101. Further, the demultiplexing units 105A and 105B demultiplex the optical wavelength multiplexed signals received by the receiving units 107A and 107B via the optical wavelength multiplexing transmission line 101 in accordance with the wavelengths, and convert them to the original wavelengths, thereby converting the 10G interface board 102A. , 102B to the receiving unit on the client side. The control panels 108A and 108B control each part such as setting control of the converted light wavelength.

  Such optical wavelength division multiplex transmission apparatuses 100A and 100B can add or remove 10G interface boards 102A and 102B in accordance with the configuration on the client side, and the multiplexing units 104A and 104B of the wavelength division multiplexers 103A and 103B. In addition, it is possible to make an economical system configuration by allowing the configuration of the separation units 105A and 105B to be increased or removed. For this purpose, each part composed of a package or the like is mounted as necessary, and is connected and assembled by an in-device optical cable (hereinafter referred to as “patch cord”). In that case, in the assembly work, the output optical power is measured for each optical port with a handy power meter or the like, and it is determined whether or not the output optical power satisfies the OMA (Optical Modulation Amplitude) standard. The measurement position of the output optical power is, for example, a CLNT side position surrounded by a dotted line in FIG.

In addition, the optical cable connection work in the office where the optical wavelength division multiplex transmission apparatus is installed is that after the optical output power of each optical port is measured and confirmed, the optical output power of both optical ports to which the optical cable is connected satisfies the OMA standard. In this case, the client side device is connected by an optical cable. If the optical output power of one of the optical ports does not satisfy the OMA standard, it is determined that the optical module has failed and the package is replaced. Further, after connecting the optical wavelength division multiplexing transmission apparatuses 100A and 100B with the optical wavelength division multiplexing transmission line 101, the presence or absence of an abnormality alarm is confirmed. When there is no abnormality alarm, the connection operation is terminated. When an abnormal alarm occurs, the source of whether or not it is in the own device is determined, and if it is within the own device, package replacement or patch cord replacement is performed according to the alarm content.
JP 2006-279355 A JP-T-2006-518149

  When an optical wavelength division multiplex transmission device with a configuration corresponding to the system scale is manufactured and installed in a station building, it cannot be flexibly dealt with system expansion and contraction. This is one of the causes of cost increase. On the other hand, the optical wavelength division multiplex transmission apparatus shown in FIG. 5 can be assembled so as to have a configuration corresponding to the system scale, and the cost can be reduced. However, since the packages and the like are connected by patch cords, there are many connection points, and there is a problem that the assembling work becomes complicated. For example, in the case of the optical wavelength division multiplex transmission apparatus shown in FIG. 5, the connection place by the patch cord is a place surrounded by a dotted line in FIG. 6 showing the same configuration as that in FIG. For example, a patch cord for connecting between the multiplexing units 104A and 104B and the separating units 105A and 105B of the wavelength multiplexing and demultiplexing boards 103A and 103B and a large number of 10G interface boards 102 is usually provided with optical connectors at both ends. However, since a large number of connection operations are performed while checking between predetermined connections, there is a problem that the operation becomes relatively complicated.

  Also, since there is no monitoring means between the optical ports connected by the patch cord, there is a problem that it is not easy to detect connection errors and to separate them. Further, the optical output regulations on the client side include extinction ratios other than optical power, and OMA standards including these are complicated. Accordingly, the work must be carried out with reference to the manual, and there is a problem that the work time becomes long. Also, whether or not the transmission unit of the 10G interface board operates normally is determined whether or not the transmission unit is normal when the connection destination cannot perform normal reception processing. Although it is necessary to determine whether or not it is normal, there is also a problem that it is not easy to isolate. In addition, since the optical wavelength multiplexing transmission line 101 side has different attenuation amounts corresponding to the multiplexed wavelengths, it is necessary to adjust the attenuation amount corresponding to the wavelength, and this adjustment requires a lot of time. was there.

  The present invention solves the above-mentioned conventional problems, simplifying the connection procedure using patch cords, preventing connection errors, speeding up the isolation of abnormal parts, and speeding up the handling of problems such as failures. It aims to plan.

  An optical signal wavelength division multiplexing transmission apparatus according to the present invention includes an interface board including a client side transmission unit and reception unit, a network side transmission unit and a reception unit, a wavelength division multiplexing panel including a multiplexing unit and a separation unit, and a control panel. And an optical wavelength multiplex transmission apparatus in which each unit is connected by a patch cord, an optical power measurement unit that measures the transmission light power of the client side transmission unit, and an extinction ratio measurement unit that measures the extinction ratio of the transmission light; A process for determining whether or not the OMA standard is satisfied based on the optical power measured by the optical power measuring unit, the extinction ratio measured by the extinction ratio measuring unit, and the interface panel type information notified from the control panel And an OMA analysis processing board including a display unit for displaying a determination result of the calculation processing unit.

  The wavelength demultiplexer is a multiplexer that converts and multiplexes the optical signal, a demultiplexer that demultiplexes the optical signal to convert it to the original wavelength, and a transmission that transmits the optical wavelength multiplexed signal from the multiplexer. A receiving unit that receives an optical wavelength division multiplexed signal and transfers it to the demultiplexing unit, an optical wavelength multiplexed signal that is transferred from the multiplexing unit to the transmitting unit, or is input to the receiving unit via an optical wavelength multiplexing transmission line An optical power measuring unit that measures the optical power of the optical wavelength multiplexed signal, and an optical wavelength multiplexed signal or optical wavelength multiplexing transmission line that is transferred from the multiplexing unit to the transmitting unit according to a measurement result by the optical power measuring unit. And an attenuation adjustment unit for adjusting attenuation of the optical wavelength multiplexed signal input to the reception unit.

  The multiplexing section and the separating section of the wavelength demultiplexing board are provided with a light level lowering detecting section for notifying the control board of a light level lowering alarm when the light level is detected and lowered to a predetermined value or less.

  The OMA analysis processing panel including the optical power measurement unit and the extinction ratio measurement unit can check the normality of the interface panel before connecting the interface panel to an external 10 GbE device, etc. With the attenuation adjustment unit, the attenuation adjustment can be automated so as to obtain a predetermined light level before connecting the patch cord in the wavelength separation panel. Further, by providing the light level lowering detection unit in the multiplexing unit and the separation unit, it is possible to take an early countermeasure against the occurrence of abnormality by checking the normality of each unit and the light level lowering detection alarm.

  An optical wavelength division multiplexing transmission apparatus according to the present invention includes an interface board including a client-side transmitter and receiver, a network-side transmitter and receiver, a wavelength multiplexer / demultiplexer including a multiplexer and a separator, and a control board. , An optical wavelength division multiplex transmission apparatus in which each unit is connected by a patch cord, an optical power measurement unit that measures the transmission light power of the client side transmission unit, and an extinction ratio measurement that measures the extinction ratio of the transmission light of the client side transmission unit And the optical power measured by the optical power measuring unit, the extinction ratio measured by the extinction ratio measuring unit, and the interface board type information notified from the control panel, it is determined whether or not it conforms to the OMA standard. An OMA analysis processing board including a calculation processing unit and a display unit for displaying a determination result of the calculation processing unit is provided.

  FIG. 1 is an explanatory diagram of the main part of the first embodiment of the present invention, where 1 is a WDM device (optical wavelength division multiplexing transmission device), 2 is a 10G interface board, 3 is a wavelength multiplexing demultiplexing board, 4 is a multiplexing section, Separation unit, 6 transmission unit, 7 reception unit, 8 control panel, 9 CLNT (client) side transmission unit, 10 NTWK (network) side transmission unit, 11 CLNT (client) side reception unit, 12 NTWK (network) side receiving unit, 21 is an OMA analysis processing board, 22 is an optical power measuring unit, 23 is an extinction ratio measuring unit, 24 is a display unit such as a liquid crystal panel, 25 is a calculation processing unit, 31 is a 10 GbE device, 32 Denotes an NTWK side transmission unit, 33 denotes an NTWK side reception unit, 34 denotes a CLNT side transmission unit, and 35 denotes a CLNT side reception unit. The basic configuration excluding the OMA analysis processing board 21 is the optical wavelength multiplexing shown in FIGS. Same as transmission equipment Shows a case of, also 10GbE device 31 indicates a device which transmits and receives data by the optical signal of a single wavelength between the WDM device 1, corresponding to 10Gb Ethernet device. In addition, the connection structure by the patch cord between the multiplexing part 4 and the separation part 5 of the 10G interface board 2 and the wavelength multiplexing / demultiplexing board 3 is not shown.

  The OMA analysis processing board 21 has a configuration including an optical power measurement unit 22, an extinction ratio measurement unit 23, a display unit 24, and a calculation processing unit 25, and can be packaged and mounted on the WDM apparatus 1. The measurement results of the optical power measurement unit 22 and the extinction ratio measurement unit 23 are input to the calculation processing unit 25, and the interface panel type information and the like are notified from the control panel 8 to the calculation processing unit 25, and the interface panel It has a function of comparing and determining whether or not it conforms to the OMA standard corresponding to the type, and displaying the determination result on the display unit 24. Therefore, first, the CLNT side transmission unit 9 of the 10G interface panel 2 and the optical power measurement unit 22 of the OMA analysis processing panel 21 are connected by a connection optical fiber as shown as connection (1). Note that the connection (2) between the extinction ratio measurement unit 23 and the connection (3) between the reception unit 35 of the 10 GbE device 31 are not connected. Then, the transmission unit 9 is set in an operating state, the output optical power of the transmission unit 9 is measured by the optical power measurement unit 22, and the measurement result is notified to the calculation processing unit 25.

  After measuring the output optical power of the transmission unit 9, the connection (1) between the optical power measurement unit 22 is removed, and the connection (2) between the transmission unit 9 and the extinction ratio measurement unit 23 is performed. In the operating state, the extinction ratio measurement unit 23 measures the extinction ratio of the output light of the transmission unit 9, and notifies the calculation processing unit 25 of the measurement result. Also, interface board type information is notified from the control board 8. The calculation processing unit 25 determines whether or not the OMA standard according to the interface panel type information notified from the control panel 8 is satisfied based on the output power and extinction ratio of the measurement result, and the determination result is displayed on the display unit. 24. If the determination result is good, the transmitter 9 of the 10G interface board 2 is normal, and the transmitter 9 and the receiver 35 of the 10 GbE device 31 are connected by an optical fiber for data transmission (3 )

  Also, when connecting the other 10G interface board 2 of the WDM device 1 and the CLNT side receiving unit of the other 10GbE device, the OMA analysis processing is sequentially performed for all the transmission units 9 of the 10G interface board 2 as described above. The connection optical fiber is connected to the optical power measurement unit 22 of the panel 21 and the output optical power of the transmission unit 9 is measured. Next, the output light is connected to the extinction ratio measurement unit 23 using the connection optical fiber. The calculation processing unit 25 determines whether or not the output optical power and the extinction ratio conform to the OMA standard corresponding to the interface board type. In the case of a good determination, the CLNT side receiver of the 10 GbE device is connected to the transmitter 9 as described above. Therefore, the reliability of the connection between the WDM apparatus 1 and a CLNT side apparatus such as a 10GeE apparatus can be ensured without preparing a special apparatus.

  FIG. 2 is an explanatory diagram of Embodiment 2 of the present invention, showing a state in which WDM devices 1A and 1B are connected by an optical wavelength division multiplexing transmission line 11, and 1A and 1B are WDM devices (optical wavelength division multiplexing transmission devices) and 2A. , 2B are 10G interface boards, 3A and 3B are wavelength demultiplexing boards, 4A and 4B are multiplexing sections, 5A and 5B are separating sections, 6A and 6B are transmitting sections, 7A and 7B are receiving sections, and 9A and 9B are CLNT sides. Transmitters 10A and 10B are NTWK side transmitters, 11A and 11B are CLNT side receivers, 12A and 12B are NTWK side receivers, 41 is an optical wavelength division multiplexing transmission path, 42A and 42B are optical power measuring units, and 43A and 43B. Indicates an attenuation measuring unit, and the control panel and the device on the CLNT side are not shown.

  The configuration of the WDM devices 1A and 1B in the second embodiment is the same as that shown in FIGS. 1, 5, and 6 in the basic configuration for connecting each part by a patch cord. Shows a state in which the NTWK side transmission units 10A and 10B and the multiplexing units 4A and 4B are connected by patch cords, and the separation unit 5B and the reception unit 7B are connected by patch cords. Yes. In addition, the case where the optical power measuring units 42A and 42B and the attenuation amount adjusting units 43A and 43B are incorporated in the wavelength separators 3A and 3B is shown. The attenuation adjustment units 43A and 43B have a function of adjusting the optical attenuation in the transmission units 6A and 6B or the reception units 7A and 7B in accordance with the measurement results of the optical power measurement units 42A and 42B. An already known optical variable attenuator or means for controlling the output optical power by controlling the bias voltage of the optical module can be applied.

  First, before connecting the multiplexer 4A and the transmitter 6A with the patch cord, the transmitter 10A on the NTWK side of the 10G interface panel 2A and the multiplexer 4A of the wavelength demultiplexer 3A are connected (4 ), The output light of the multiplexing unit 4A is connected to be input to the optical power measurement unit 42A, the NTWK side transmission unit 10A is operated, and the wavelength is converted from the multiplexing unit 4A and input to the transmission unit 6A. The optical power is measured and notified to the attenuation adjustment unit 43A. The attenuation adjustment unit 43A performs attenuation control so that the optical power input from the multiplexing unit 4A to the transmission unit 6A is optimized in accordance with the measurement result. Thereafter, the operation of the NTWK side transmission unit 10A is temporarily stopped, the connection (4) is removed, and as shown as connection (5), the multiplexing unit 4A and the transmission unit 6A are connected, and the transmission unit 6A and the WDM device are connected. As shown in the connection (6) with the optical power measuring unit 42B of the 1B wavelength multiplexing / demultiplexing board 3B, the optical wavelength multiplexing transmission line 41 is used to connect the NTWK side transmitting unit 10A, the multiplexing unit 4A, and the transmitting unit 6A to the operating state. Then, the optical power measurement unit 42B measures the optical power of the optical signal via the optical wavelength multiplex transmission line 41, and notifies the attenuation amount adjustment unit 43B.

  The attenuation adjustment unit 43B calculates the attenuation between the transmission unit 6A and the reception unit 7B connected by the optical wavelength multiplexing transmission line 41. In this case, the transmission attenuation amount of the optical wavelength multiplex transmission line 41 can be obtained by transmitting the transmission light power information of the transmission unit 6A by the in-channel method and notifying the attenuation amount adjustment unit 43B. Further, the receiving unit 7B is controlled by the attenuation amount adjusting unit 43B so that the optical power input to the separating unit 5B is adjusted to be within a desired range. In this case, attenuation adjustment is performed in accordance with the wavelength-corresponding attenuation characteristic of the optical wavelength multiplex transmission line 41. Therefore, the demultiplexer 3A. It is possible to simplify the adjustment of each unit when the 3B transmission units 6A and 6B and the reception units 7A and 7B are connected by the optical wavelength multiplexing transmission line 41.

  FIG. 3 is an explanatory diagram of a third embodiment of the present invention. The same reference numerals as those in FIGS. 1 and 2 denote the same parts, and the basic configuration for connecting each part in the apparatus with a patch cord is the first embodiment described above. , 2 is the same. The third embodiment shows a case where a light level drop detecting unit 45 is provided in each of the multiplexing unit and the separation unit of the wavelength multiplexing / demultiplexing board. An optical level detector 45 is provided corresponding to the package of the multiplexer 4A and the separator 5A in the wavelength multiplexing / separation panel 3A of the WDM apparatus 1A. In the WDM apparatus 1B, the same configuration is provided, but the illustration is omitted. The light level lowering detection unit 45 detects the level of the optical signal and compares it with a preset minimum level. When the optical signal level falls below the set minimum level, the light level lowering detection alarm is issued to the control panel 8A. In addition, a display means such as a light emitting diode can be provided to emit light by detecting a decrease in light level. In the case shown in the figure, the wavelength multiplexing / demultiplexing panel 3A of the WDM apparatus 1A has a configuration in which an optical level decrease detecting unit 45 is incorporated in each of the multiplexing unit 4A and the demultiplexing unit 5A. Notify 8A. The control panel 8A sends an abnormality occurrence notification to a host device (not shown) operated by a maintenance person or the like. Further, the light level lowering detection unit 45 includes a display unit, so that it is possible to quickly identify the abnormality occurrence package, and the abnormality occurrence package can be replaced with a normal package.

  FIG. 4 is a flowchart of the fourth embodiment of the present invention, showing a work procedure of the optical wavelength division multiplex transmission apparatus (WDM apparatus), and showing a case where the work procedure is sequentially instructed by the installation procedure program. For example, the installation procedure program is executed by a personal computer, connection work is performed according to the displayed procedure, and the result is input, thereby sequentially instructing the procedure as shown in steps (s1) to (s11). Note that reference numerals A and B of each part are omitted, and description will be made using only numerals. First, the CLNT side transmitter 9 of the mounted 10G interface board 2 is connected to the optical power measuring unit 22 and the extinction ratio measuring unit 23 of the OMA analysis processing device 21 by the OMA analysis processing device 21 in FIG. The optical fiber is sequentially connected, and based on the measurement result, the calculation processing unit 25 determines whether or not it conforms to the OMA standard (s1). If the determination result does not conform to the OMA standard, the replacement of the 10G interface board 2 is instructed (s2). If it matches, the connection is instructed between the CLNT side of the 10G interface panel 2 and an external device such as the 10GbE device 31 (s3).

  Next, the transmitter 10 and the receiver 12 on the NTWK side of the 10G interface board 2 and the multiplexer 4 and the separator 5 of the wavelength demultiplexer 3 are instructed to be connected by a patch cord (s4). 2 is instructed to connect the multiplexer 4 and separator 5 of the wavelength demultiplexer 3 with the patch cord between the transmitter 6 and the receiver 7 (s5). As shown in FIG. 4, the optical wavelength multiplexing transmission line 41 instructs connection between WDM apparatuses (s6). In this connection process, the optical power measurement units 42A and 42B and the attenuation amount adjustment units 43A and 43B measure the optical power and control the attenuation amount. Then, it is instructed to check whether there is an abnormality in the patch cord (s7). If there is no abnormality, the installation operation is terminated (s11).

  If there is an abnormal part in step (s7), an instruction to clean the connector or patch cord is given (s8), and it is determined whether the abnormal part has recovered (s9). End (s11). If not recovered, the 10G interface board 2 is instructed to confirm the normality of the optical output on the NTWK side (s10). If normality cannot be confirmed, an instruction to replace the 10G interface panel is given (s2). Therefore, even an unskilled person can perform an internal connection using a patch cord and a connection operation with an external device. In addition, by incorporating an optical power measurement unit, an extinction ratio measurement unit, an attenuation adjustment unit, and the like, connection operations can be sequentially performed without bringing various measuring instruments.

It is principal part explanatory drawing of Example 1 of this invention. It is principal part explanatory drawing of Example 2 of this invention. It is principal part explanatory drawing of Example 3 of this invention. It is a flowchart of Example 4 of the present invention. It is explanatory drawing of the optical power measurement of a prior art example. It is explanatory drawing of the patch cord connection location of an optical signal wavelength division multiplex transmission apparatus.

Explanation of symbols

1 WDM equipment (optical signal wavelength division multiplexing transmission equipment)
2 10G interface device 3 Wavelength demultiplexer 4 Multiplexer 5 Demultiplexer 6 Transmitter 7 Receiver 8 Control panel 9 CLNT side transmitter 10 NTWK side transmitter 11 CLNT side receiver 12 NTWK side receiver 21 OMA analysis processing board 22 Light Power measurement unit 23 Extinction ratio measurement unit 24 Display unit 25 Calculation processing unit 31 10 GbE device 32 NTWK side transmission unit 33 NTWK side reception unit 34 CLNT side transmission unit 35 CLNT side reception unit

Claims (3)

Optical wavelength that includes an interface board including a client-side transmitter and receiver, a network-side transmitter and receiver, a wavelength multiplexing / demultiplexing board including a multiplexer and a separator, and a control board, and connecting each section with a patch cord In multiplex transmission equipment,
An optical power measurement unit that measures the transmission light power of the client side transmission unit, an extinction ratio measurement unit that measures an extinction ratio of the transmission light, an optical power measured by the optical power measurement unit, and an extinction ratio measurement unit Based on the measured extinction ratio and the interface panel type information notified from the control panel, a calculation processing unit that determines whether or not it conforms to the OMA standard, and a display unit that displays the determination result of the calculation processing unit An optical wavelength division multiplexing transmission apparatus comprising an OMA analysis processing board including:   The wavelength multiplexing and demultiplexing panel includes a multiplexing unit that converts an optical signal by wavelength conversion and multiplexes, a demultiplexing unit that performs wavelength conversion and converts the signal to an original wavelength, and a transmission that transmits an optical wavelength multiplexed signal from the multiplexing unit. A receiving unit that receives an optical wavelength division multiplexed signal and transfers it to the demultiplexing unit, an optical wavelength multiplexed signal that is transferred from the multiplexing unit to the transmitting unit, or is input to the receiving unit via an optical wavelength multiplexing transmission line An optical power measuring unit that measures the optical power of the optical wavelength multiplexed signal, and an optical wavelength multiplexed signal or optical wavelength multiplexing transmission line that is transferred from the multiplexing unit to the transmitting unit according to a measurement result by the optical power measuring unit. The optical wavelength division multiplex transmission apparatus according to claim 1, further comprising an attenuation amount adjusting unit that adjusts an attenuation of an optical wavelength multiplexed signal input to the receiving unit via the optical signal.   The multiplexing unit and the separating unit of the wavelength multiplexing / separating panel include a light level decrease detecting unit that detects a light level and detects a light level decrease alarm when the light level is decreased to a predetermined value or less. The optical wavelength division multiplexing transmission apparatus according to claim 1 or 2.

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