JP5760490B2 - Wavelength division multiplexing system and transmission side wavelength division multiplexing apparatus and reception side wavelength division multiplexing apparatus in the system - Google Patents

Description

  The present invention relates to a wavelength division multiplexing system in which a high-density wavelength division multiplexing (DWDM) transmission system is incorporated in a low-density wavelength division multiplexing (CWDM) transmission system, and a transmission side in the system The present invention relates to a wavelength division multiplexing apparatus and a receiving side wavelength division multiplexing / demultiplexing apparatus.

  Wavelength division multiplexing transmission systems include a high density wavelength division multiplexing (DWDM) transmission system and a low density wavelength division multiplexing (CWDM) transmission system. In DWDM, the wavelength interval of an optical signal is as narrow as about 0.5 to 2.0 nm, and in CWDM, it is as wide as about 20 nm. The parts constituting the DWDM transmission system have high required accuracy and are expensive because sorting is required to meet the specifications, whereas the parts constituting the CWDM transmission system are inexpensive because the required precision is low.

  Although the CWDM transmission system is inexpensive, the number of wavelengths that can be assigned to one optical fiber is limited because the wavelength interval is wide, so it is often applied to a metro access region with a small transmission capacity. As bandwidth demand increases after the system is introduced, a means for increasing the number of signals is required.

  Therefore, a method of adding a signal by connecting a DWDM transmission system to a CWDM transmission system and transmitting a plurality of DWDM signals instead of one wavelength of the CWDM signal has been studied (for example, see Patent Document 1). In the case where the CWDM wavelength interval is 20 nm and the DWDM wavelength interval is 0.8 nm, theoretically, 25 DWDM signals can be accommodated for one wavelength of the CWDM signal.

Japanese Patent No. 4463808

  However, since the components constituting the CWDM transmission system have low required accuracy, the required accuracy required to conduct the DWDM signal over the entire wavelength interval of 20 nm of the CWDM signal is not always satisfied, and depending on the wavelength, the transmission characteristics of the DWDM signal Deteriorates.

  In addition, the CWDM signal of the CWDM transmission system with an interval of 20 nm is normally within the range of the center wavelength ± 6.5 nm. However, when the DWDM transmission system is connected to the CWDM transmission system, 8 waves or more are added to the 7 nm outside the range. May be able to accommodate.

  Therefore, the present invention increases the number of signals of the high-density wavelength division multiplexing transmission system as much as possible as long as the quality characteristics are satisfied when the high-density wavelength division multiplexing transmission system is incorporated into the low-density wavelength division multiplexing transmission system. It is an object of the present invention to provide a wavelength division multiplexing system that enables the transmission side wavelength division multiplexing apparatus and reception side wavelength division multiplexing apparatus in the system.

According to a first aspect of the present invention, one or more optical transmission units for a low-density wavelength division multiplexing transmission system, a plurality of optical transmission units for a high-density wavelength division multiplexing transmission system, and the plurality of high-density wavelengths A first optical multiplexing unit for multiplexing light output from the optical transmission unit for the division multiplexing transmission system; and light output from the optical transmission unit for the one or more low-density wavelength division multiplexing transmission systems. A transmission-side wavelength division multiplexing device comprising: a second optical multiplexing unit for multiplexing the light output from the first optical multiplexing unit; and the one or more low-density wavelength division multiplexing transmission systems One or more optical receiver units for low-density wavelength division multiplex transmission systems corresponding to each of the optical transmitter units, and an optical transmitter unit for the plurality of high-density wavelength division multiplex transmission systems, respectively. A plurality of optical receiving units for the high-density wavelength division multiplexing transmission system; a first optical demultiplexing unit for distributing the input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems; A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; , a wavelength division multiplexing system comprising a receiving-side wavelength division demultiplexer, a comprising a number and wavelength and / or the plurality of dense wavelength of the optical transmission units for the plurality of dense wavelength division multiplexing transmission system the number and the wavelength of light receiving units for division multiplexing transmission system, wavelength transmission characteristics of the first optical multiplexing unit, wavelength transmission characteristics of the second optical multiplexing unit, said first optical branching Wavelength division multiplexing system further comprising said Rukoto means be determined based on the specific quality characteristics affected by the wavelength transmission characteristic of the wavelength transmission characteristic and the second optical demultiplexing unit of the unit is provided.

According to a second aspect of the present invention, one or more optical transmission units for a low-density wavelength division multiplexing transmission system, a plurality of optical transmission units for a high-density wavelength division multiplexing transmission system, and the plurality of high-density wavelengths A first optical multiplexing unit for multiplexing light output from the optical transmission unit for the division multiplexing transmission system; and light output from the optical transmission unit for the one or more low-density wavelength division multiplexing transmission systems. A transmission-side wavelength division multiplexing device comprising: a second optical multiplexing unit for multiplexing the light output from the first optical multiplexing unit; and the one or more low-density wavelength division multiplexing transmission systems One or more optical receiver units for low-density wavelength division multiplex transmission systems corresponding to each of the optical transmitter units, and an optical transmitter unit for the plurality of high-density wavelength division multiplex transmission systems, respectively. A plurality of optical receiving units for the high-density wavelength division multiplexing transmission system; a first optical demultiplexing unit for distributing the input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems; A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; , a transmitting side wavelength division multiplexing apparatus in a wavelength division multiplexing system comprising a receiving-side wavelength division demultiplexer comprising the number and wave length of light transmitting unit for the plurality of dense wavelength division multiplexing transmission system , Wavelength transmission characteristics of the first optical multiplexing unit, wavelength transmission characteristics of the second optical multiplexing unit, wavelength transmission characteristics of the first optical multiplexing unit, and the second optical demultiplexing unit Transmitting side wavelength division multiplexing device characterized by further comprising means for determining based on the quality characteristics affected by the wavelength transmission characteristic is provided.

According to a third aspect of the present invention, one or more optical transmission units for a low-density wavelength division multiplexing transmission system, a plurality of optical transmission units for a high-density wavelength division multiplexing transmission system, and the plurality of high-density wavelengths A first optical multiplexing unit for multiplexing light output from the optical transmission unit for the division multiplexing transmission system; and light output from the optical transmission unit for the one or more low-density wavelength division multiplexing transmission systems. A transmission-side wavelength division multiplexing device comprising: a second optical multiplexing unit for multiplexing the light output from the first optical multiplexing unit; and the one or more low-density wavelength division multiplexing transmission systems One or more optical receiver units for low-density wavelength division multiplex transmission systems corresponding to each of the optical transmitter units, and an optical transmitter unit for the plurality of high-density wavelength division multiplex transmission systems, respectively. A plurality of optical receiving units for the high-density wavelength division multiplexing transmission system; a first optical demultiplexing unit for distributing the input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems; A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; , a receiver-side wavelength-division demultiplexer in a wavelength division multiplexing system comprising a receiving-side wavelength division demultiplexer, a comprising a number of light receiving units for the plurality of dense wavelength division multiplexing transmission system and the wavelength, the wavelength transmission characteristic of the first optical multiplexing unit, the wavelength transmission characteristic of the second optical multiplexing unit, the wavelength transmission characteristic of the first optical demultiplexing unit and the second optical demultiplexing Uni DOO further comprising receiving side wavelength division demultiplexing apparatus according to claim Rukoto means be determined based on the specific quality characteristics affected by the wavelength transmission characteristic is provided.

According to a fourth aspect of the present invention, one or more optical transmission units for a low-density wavelength division multiplexing transmission system, a plurality of optical transmission units for a high-density wavelength division multiplexing transmission system, and the plurality of high-density wavelengths A first optical multiplexing unit for multiplexing light output from the optical transmission unit for the division multiplexing transmission system; and light output from the optical transmission unit for the one or more low-density wavelength division multiplexing transmission systems. A transmission-side wavelength division multiplexing device comprising: a second optical multiplexing unit for multiplexing the light output from the first optical multiplexing unit; and the one or more low-density wavelength division multiplexing transmission systems One or more optical receiver units for low-density wavelength division multiplex transmission systems corresponding to each of the optical transmitter units, and an optical transmitter unit for the plurality of high-density wavelength division multiplex transmission systems, respectively. A plurality of optical receiving units for the high-density wavelength division multiplexing transmission system; a first optical demultiplexing unit for distributing the input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems; A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; A receiving-side wavelength division multiplex / demultiplex apparatus, and a selection apparatus for a wavelength division multiplex system , the number and wavelength of optical transmission units for the plurality of high-density wavelength division multiplex transmission systems and / or the number and the wavelength of the optical receiver unit for the plurality of dense wavelength division multiplexing transmission system, wavelength transmission characteristics of the first optical multiplexing unit wavelength transmission JP said second optical multiplexing unit , The select and wherein the obtaining Bei means for determining based on the first wavelength transmission characteristics and quality characteristics affected by the wavelength transmission characteristic of said second optical demultiplexing unit of the optical demultiplexing unit Provided.

According to a fifth aspect of the present invention, one or more optical transmission units for a low density wavelength division multiplexing transmission system, one or more optical transmission units for a high density wavelength division multiplexing transmission system, and the one or more low transmission wavelengths optical multiplexing unit for multiplexing the light output from the optical transmitting unit for coarse wavelength division multiplexing transmission system, and a light output from the optical transmission unit for the one or more dense wavelength division multiplexing transmission system When a transmitting side wavelength division multiplexing apparatus and a light receiving unit for the one or more one or more low-density wavelength division multiplexing transmission systems respectively corresponding to the optical transmitting unit for coarse wavelength division multiplexing transmission system, wherein 1 or more and a light receiving unit for one or more dense wavelength division multiplexing transmission systems respectively corresponding to the optical transmitting unit for dense wavelength division multiplexing transmission system, the transmitting side wavelength component Optical demultiplexing for distributing the light entered from division multiplexing device in the optical receiver unit for the one or more low-density wavelength division light receiving unit and the one or more dense wavelength division multiplexing transmission system for multiplex transmission system a wavelength division multiplexing system comprising unit and a receiving-side wavelength division demultiplexer comprising, wherein the one or more wavelengths of light transmit unit for dense wavelength division multiplexing transmission system and / or the one or more dense wavelength division multiplexing the wavelength of the light receiver unit for the transmission system, prior Symbol optical multiplexing unit of the wavelength transmission characteristics and means be determined based on the specific quality characteristics affected by the wavelength transmission characteristic of said optical demultiplexing unit further comprising wavelength division multiplexing system that wherein Rukoto is provided.

According to a sixth aspect of the present invention, one or more of the light transmitting unit for coarse wavelength division multiplexing transmission system, an optical transmitter unit for one or more dense wavelength division multiplexing transmission system, the one or more high Output from the first optical multiplexing unit for multiplexing the light output from the optical transmission unit for the density wavelength division multiplexing transmission system and the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems A transmission-side wavelength division multiplexing apparatus comprising: a second optical multiplexing unit for multiplexing light and the light output from the first optical multiplexing unit; and the one or more low-density wavelength division multiplexing transmissions One or more optical receiver units for low-density wavelength division multiplexing transmission systems respectively corresponding to optical transmission units for the system and one or more optical transmission units for high-density wavelength division multiplexing transmission systems, respectively. One or more optical receiving units for the one or more high-density wavelength division multiplex transmission systems and a first optical component for distributing the input light to the one or more optical receiving units for the high-density wavelength division multiplex transmission system. And a second light for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more optical receiving units for the low density wavelength division multiplexing transmission system and the first optical demultiplexing unit a signal-side wavelength-division multiplexer transmission in a wavelength division multiplexing system comprising a demultiplexing unit, a receiving-side wavelength division demultiplexer comprising an optical transmit for the one or more dense wavelength division multiplexing transmission system the wavelength of the unit, the wavelength transmission characteristic of the first optical multiplexing unit, the wavelength transmission characteristic of the second optical multiplexing unit wavelength transmission characteristic and the second optical demultiplexer of the first optical demultiplexing unit Yu Tsu DOO Shin-side wavelength-division multiplexer transmission, characterized in that it further comprises means for determining based on the quality characteristics affected by the wavelength transmission characteristic is provided.

According to a seventh aspect of the present invention, one or more of the light transmitting unit for coarse wavelength division multiplexing transmission system, an optical transmitter unit for one or more dense wavelength division multiplexing transmission system, the one or more high Output from the first optical multiplexing unit for multiplexing the light output from the optical transmission unit for the density wavelength division multiplexing transmission system and the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems A transmission-side wavelength division multiplexing apparatus comprising: a second optical multiplexing unit for multiplexing light and the light output from the first optical multiplexing unit; and the one or more low-density wavelength division multiplexing transmissions One or more optical receiver units for low-density wavelength division multiplexing transmission systems respectively corresponding to optical transmission units for the system and one or more optical transmission units for high-density wavelength division multiplexing transmission systems, respectively. 1 or more and a light receiving unit for dense wavelength division multiplexing transmission system corresponding first optical branching for distributing the light entered to the light receiving unit for the one or more high-density wavelength division multiplexing transmission system And a second light for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more optical receiving units for the low density wavelength division multiplexing transmission system and the first optical demultiplexing unit a receiving side wavelength division demultiplexer in a wavelength division multiplexing system comprising a demultiplexing unit, a receiving-side wavelength division demultiplexer comprising, a light receiving for the one or more dense wavelength division multiplexing transmission system the wavelength of the unit, the wavelength transmission characteristic of the first optical multiplexing unit, wavelength transmission characteristics of the second optical multiplexing unit, wavelength transmission characteristics of the first optical demultiplexing unit and the second light component Further comprising receiving side wavelength division demultiplexing apparatus according to claim Rukoto means be determined based on the specific quality characteristics affected by the wavelength transmission characteristic of the unit is provided.

According to an eighth aspect of the present invention, one or more of the light transmitting unit for coarse wavelength division multiplexing transmission system, an optical transmitter unit for one or more dense wavelength division multiplexing transmission system, the one or more high a first optical multiplexing unit for multiplexing the light output from the optical transmitting unit for coarse wavelength division multiplexing transmission system, which is output from the optical transmission unit for the one or more low-density wavelength division multiplexing transmission system A transmission-side wavelength division multiplexing apparatus comprising: a second optical multiplexing unit for multiplexing light and the light output from the first optical multiplexing unit; and the one or more low-density wavelength division multiplexing transmissions One or more optical receiver units for low-density wavelength division multiplexing transmission systems respectively corresponding to optical transmission units for the system and one or more optical transmission units for high-density wavelength division multiplexing transmission systems, respectively. 1 or more and a light receiving unit for dense wavelength division multiplexing transmission system corresponding first light for distributing the light entered to the light receiving unit for the one or more high-density wavelength division multiplexing transmission system A demultiplexing unit, and a second light for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more optical receiving units for the low-density wavelength division multiplexing transmission system and the first optical demultiplexing unit A receiving-side wavelength division multiplexing / demultiplexing device comprising: an optical demultiplexing unit; and a selection device for a wavelength division multiplexing system comprising: an optical transmission unit for the one or more high-density wavelength division multiplexing transmission systems; the wavelength of the light receiving unit for wavelength and / or the one or more dense wavelength division multiplexing transmission systems, wavelength transmission characteristics of the first optical multiplexing unit wavelength transmission JP said second optical multiplexing unit , The select and wherein the obtaining Bei means for determining based on the first wavelength transmission characteristics and quality characteristics affected by the wavelength transmission characteristic of said second optical demultiplexing unit of the optical demultiplexing unit Provided.

  According to the present invention, when a high-density wavelength division multiplexing transmission system is incorporated into a low-density wavelength division multiplexing transmission system, the number of signals of the high-density wavelength division multiplexing transmission system can be increased as much as possible as long as the quality characteristics are satisfied. It becomes possible.

It is a figure which shows the structure which connected the DWDM transmission system to the CWDM transmission system by Embodiment 1 of this invention. It is a figure which shows the structure of the multiplexed optical signal of a normal CWDM signal. It is a figure which shows the structure of an ideal multiplexed optical signal at the time of connecting a DWDM transmission system to a CWDM transmission system. It is a figure which shows the wavelength transmission characteristic of the optical multiplexing / demultiplexing units C1 and C2 shown in FIG. It is a figure which shows the structure of the actual multiplexed optical signal after passing through the optical multiplexing / demultiplexing unit C1. It is a figure which shows the structure which connected the DWDM transmission system to the CWDM transmission system by Embodiment 3 of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  In this embodiment, by recording the transmission characteristic for each transmission wavelength of the DWDM signal, the transmission characteristic of each wavelength within the CWDM wavelength band is detected, and the wavelength with the good transmission characteristic is selected to select the wavelength of the optical transmission unit. Set.

  This makes it possible to set the wavelength with the best transmission characteristics and to accommodate as many DWDM signals as possible in the CWDM signal band while ensuring the necessary transmission characteristics.

  Further, in the present embodiment, in the wavelength division multiplexing transmission system, when the light of the DWDM wavelength is combined with the filter of the CWDM wavelength, it is possible to select the wavelength at which the transmission characteristic is an appropriate value and the optimum wavelength. It is characterized by that.

[Embodiment 1]
FIG. 1 shows one configuration in which a DWDM transmission system is connected to a CWDM transmission system.

  In FIG. 1, the transmission side wavelength division multiplexing apparatus includes optical transmission units A1 to Am (m is an arbitrary integer), optical multiplexing / demultiplexing unit C1, optical multiplexing / demultiplexing unit D1, and optical transmission units E1 to En (n is an arbitrary integer). including. The receiving side wavelength division multiplexing / demultiplexing device includes optical receiving units B1 to Bm (m is an arbitrary integer), an optical multiplexing / demultiplexing unit C2, an optical multiplexing / demultiplexing unit D2, and optical receiving units F1 to Fn (n is an arbitrary integer).

  The optical transmission units A1 to Am are CWDM signal transmission units, and the optical reception units B1 to Bm are CWDM signal reception units.

  The optical multiplexing / demultiplexing units C1, C2 are optical multiplexing / demultiplexing units for the CWDM signal, and the optical multiplexing / demultiplexing units D1, D2 are optical multiplexing / demultiplexing units for the DWDM signal.

  Optical multiplexing / demultiplexing units C1, D1 used for optical multiplexing / demultiplexing include couplers, splitters, filters, AWGs (Arrayed Waveguide Grating), etc., and optical multiplexing / demultiplexing units C2, D2 used for optical multiplexing / demultiplexing include filters, AWGs, etc. Including.

  The optical transmission units E1 to En are DWDM signal transmission units, and the optical reception units F1 to Fn are DWDM signal reception units.

  The transmission characteristics observed in the optical receiving units F1 to Fn are recorded in the monitoring units G1 and G2, and are used to control the optical transmitting units E1 to En.

  FIG. 2 shows a structure of a multiplexed optical signal of a normal CWDM signal.

  FIG. 3 shows an ideal multiplexed optical signal configuration when a DWDM transmission system is connected to a CWDM transmission system.

  FIG. 4 shows the wavelength transmission characteristics of the optical multiplexing / demultiplexing units C1 and C2 of FIG. The wavelength transmission characteristics at the DWDM wavelengths L1 to Ln of the optical multiplexing / demultiplexing unit C1 are P1 to Pn, and the wavelength transmission characteristics at the DWDM wavelengths L1 to Ln of the optical multiplexing / demultiplexing unit C2 are Q1 to Qn.

  FIG. 5 shows a configuration of an actual multiplexed optical signal after passing through the optical multiplexing / demultiplexing unit C1.

  In the configuration of FIG. 1 in which the DWDM transmission system is connected to the CWDM transmission system, the CWDM signal light transmitted from the optical transmission units A1 to Am is multiplexed by the optical multiplexing / demultiplexing unit C1. Similarly, the DWDM signal light transmitted from the optical transmission units E1 to En is multiplexed by the optical multiplexing / demultiplexing unit D1, and further multiplexed to the CWDM signal light by the optical multiplexing / demultiplexing unit C1, and output to the transmission path as a multiplexed optical signal. Is done.

  The multiplexed optical signal output to the transmission path is separated by the optical multiplexing / demultiplexing unit C2, and the CWDM signal light is received by the optical receiving units B1 to Bm. The DWDM signal light is further separated by the optical multiplexing / demultiplexing D2, and then received by the optical receiving units F1 to Fn.

  Depending on the wavelength band of the DWDM signal light, in addition to the optical multiplexing / demultiplexing units D1, D2 designed to transmit the DWDM wavelength, the wavelength transmission characteristics of the optical multiplexing / demultiplexing units C1, C2 are strongly influenced.

  As the transmission characteristics of the DWDM signal light of wavelengths L1 to Ln input to the optical receiving units F1 to Fn, the error rate, transmission loss, S / N ratio, etc. before FEC (Forward Error Correction) correction are shown in the monitoring units G1 and G2. Record.

  Based on the recorded information, the number of DWDM wavelengths that can be accommodated in the CWDM transmission system is calculated.

  That is, for example, the quality characteristic is an error rate before FEC correction, transmission loss, S / N, or a combination thereof, and only DWDM signal light having a wavelength whose quality characteristic is a predetermined value or more is used. For example, depending on the value of the quality characteristic, the DWDM signal light to be used has a wavelength L1 to Ln, or the DWDM signal light to be used has a wavelength L2 to Ln-1.

  Such selection of the DWDM signal light to be used may be performed by a human when the wavelength division multiplexing system is installed, or may be performed using a selection device.

  As described above, in this embodiment, it is possible to improve the DWDM signal accommodation efficiency of the wavelength division multiplexing transmission system by accurately knowing the number of DWDM wavelengths that can be accommodated in the CWDM transmission system of the transmission path. The effect is played.

[Embodiment 2]
The optical multiplexing / demultiplexing units D1 and D2 are changed to couplers (not shown) or splitters (not shown) whose input / output ports do not have wavelength dependency. By making the optical transmission units E1 to En optical transmission units capable of changing the wavelength, it becomes possible to measure the transmission characteristics of the DWDM wavelengths L1 to Ln with one optical transmission unit.

[Embodiment 3]
FIG. 6 shows another configuration in which the DWDM transmission system is connected to the CWDM transmission system.

  The configuration of FIG. 6 is different from the configuration of FIG. 1 in that the optical multiplexing / demultiplexing unit D1 and the optical multiplexing / demultiplexing unit D2 are omitted, and the light output from the optical transmission units E1 to En is directly input to the optical multiplexing / demultiplexing unit C1. The light receiving units F1 to Fn directly input the light output from the optical multiplexing / demultiplexing unit C2.

  In the configuration of FIG. 1, since the optical multiplexing / demultiplexing unit D1 combines n lights into one and the optical multiplexing / demultiplexing unit D2 separates one light into n, the number of input ports and the optical multiplexing of the optical multiplexing / demultiplexing unit C1 are reduced. It is possible to increase the sum of the number of DWDM signals and the number of CWDM signals rather than the number of output ports of the demultiplexing unit C2. In contrast, in the configuration of FIG. 6, since there is no optical multiplexing / demultiplexing unit D1 and optical multiplexing / demultiplexing unit D2, the number of DWDM signals is larger than the number of input ports of optical multiplexing / demultiplexing unit C1 and the number of output ports of optical multiplexing / demultiplexing unit C2. The sum of the number and the number of CWDM signals cannot be increased. However, since there is no optical multiplexing / demultiplexing unit D1 and optical multiplexing / demultiplexing unit D2, the configuration can be simplified and the cost can be reduced.

  In this case, the wavelength accommodation efficiency of the DWDM signal cannot be improved, but the quality characteristic of the DWDM transmission system can be improved by selecting the wavelength with the best quality characteristic of the DWDM signal light within the range of the CWDM wavelength band as the transmission wavelength. It becomes possible to improve. That is, for example, it is possible to improve the quality characteristics of the DWDM transmission system by using only one light of the DWDM transmission system accommodated in the CWDM wavelength x and selecting the wavelength having the best quality characteristics.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
An optical transmission unit for a plurality of high-density wavelength division multiplexing transmission systems;
A first optical multiplexing unit for multiplexing the light output from the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
A plurality of optical receiver units for high-density wavelength division multiplexing transmission systems respectively corresponding to the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A first optical demultiplexing unit for distributing input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
A receiving side wavelength division demultiplexing device comprising:
A wavelength division multiplexing system comprising:
The number and wavelength of the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems and the number and wavelength of the optical reception units for the plurality of high-density wavelength division multiplexing transmission systems are the wavelength of the first optical multiplexing unit. Based on transmission characteristics, wavelength transmission characteristics of the second optical multiplexing unit, wavelength transmission characteristics of the first optical demultiplexing unit, and quality characteristics affected by the wavelength transmission characteristics of the second optical demultiplexing unit A wavelength division multiplexing system characterized by being determined.

(Appendix 2)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
An optical transmission unit for a plurality of high-density wavelength division multiplexing transmission systems;
A first optical multiplexing unit for multiplexing the light output from the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
A plurality of optical receiver units for high-density wavelength division multiplexing transmission systems respectively corresponding to the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A first optical demultiplexing unit for distributing input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
A receiving side wavelength division demultiplexing device comprising:
A wavelength division multiplexing system comprising:
The number and wavelength of the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems and the number and wavelength of the optical reception units for the plurality of high-density wavelength division multiplexing transmission systems are set to the wavelength of the first optical multiplexing unit. Based on transmission characteristics, wavelength transmission characteristics of the second optical multiplexing unit, wavelength transmission characteristics of the first optical demultiplexing unit, and quality characteristics affected by the wavelength transmission characteristics of the second optical demultiplexing unit The wavelength division multiplexing system further comprising means for determining.

(Appendix 3)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
An optical transmission unit for a plurality of high-density wavelength division multiplexing transmission systems;
A first optical multiplexing unit for multiplexing the light output from the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
A plurality of optical receiver units for high-density wavelength division multiplexing transmission systems respectively corresponding to the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A first optical demultiplexing unit for distributing input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
A receiving side wavelength division demultiplexing device comprising:
A wavelength division multiplexing apparatus for transmission in a wavelength division multiplexing system comprising:
The number of optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems includes the wavelength transmission characteristics of the first optical multiplexing unit, the wavelength transmission characteristics of the second optical multiplexing unit, and the first optical demultiplexing. A transmission side wavelength division multiplex apparatus characterized in that it is determined based on a quality characteristic influenced by a wavelength transmission characteristic of the unit and a wavelength transmission characteristic of the second optical demultiplexing unit.

(Appendix 4)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
An optical transmission unit for a plurality of high-density wavelength division multiplexing transmission systems;
A first optical multiplexing unit for multiplexing the light output from the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
A plurality of optical receiver units for high-density wavelength division multiplexing transmission systems respectively corresponding to the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A first optical demultiplexing unit for distributing input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
A receiving side wavelength division demultiplexing device comprising:
A receiving side wavelength division demultiplexing device in a wavelength division multiplexing system comprising:
The number of the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems is set to the wavelength transmission characteristics of the first optical multiplexing unit, the wavelength transmission characteristics of the second optical multiplexing unit, and the first optical demultiplexing. A transmission-side wavelength division multiplexing apparatus, further comprising means for determining based on a wavelength characteristic of the unit and a quality characteristic influenced by the wavelength transmission characteristic of the second optical demultiplexing unit.

(Appendix 5)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
An optical transmission unit for a plurality of high-density wavelength division multiplexing transmission systems;
A first optical multiplexing unit for multiplexing the light output from the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
A plurality of optical receiver units for high-density wavelength division multiplexing transmission systems respectively corresponding to the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A first optical demultiplexing unit for distributing input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
A receiving side wavelength division demultiplexing device comprising:
A receiving side wavelength division demultiplexing device in a wavelength division multiplexing system comprising:
The number and wavelength of optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems are the wavelength transmission characteristics of the first optical multiplexing unit, the wavelength transmission characteristics of the second optical multiplexing unit, and the first light. A receiving-side wavelength division multiplex / demultiplexing device, which is determined based on a quality characteristic influenced by a wavelength transmission characteristic of the demultiplexing unit and a wavelength transmission characteristic of the second optical demultiplexing unit.

(Appendix 6)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
An optical transmission unit for a plurality of high-density wavelength division multiplexing transmission systems;
A first optical multiplexing unit for multiplexing the light output from the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
A plurality of optical receiver units for high-density wavelength division multiplexing transmission systems respectively corresponding to the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A first optical demultiplexing unit for distributing input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
A receiving side wavelength division demultiplexing device comprising:
A receiving side wavelength division demultiplexing device in a wavelength division multiplexing system comprising:
The number and wavelength of the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems are set as the wavelength transmission characteristic of the first optical multiplexing unit, the wavelength transmission characteristic of the second optical multiplexing unit, and the first light. A receiving-side wavelength division demultiplexing apparatus, further comprising means for determining based on a wavelength transmission characteristic of the demultiplexing unit and a quality characteristic influenced by the wavelength transmission characteristic of the second optical demultiplexing unit.

(Appendix 7)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
One or more optical transmission units for a high-density wavelength division multiplexing transmission system;
For multiplexing light output from the one or more optical transmission units for the low-density wavelength division multiplexing transmission system and light output from the optical transmission unit for the one or more high-density wavelength division multiplexing systems. An optical multiplexing unit,
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
One or more optical receiver units for the high-density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the high-density wavelength division multiplex transmission system;
Distributing light input from the transmission side wavelength division multiplexing apparatus to the one or more optical receiving units for the low density wavelength division multiplexing transmission system and the optical receiving unit for the one or more high density wavelength division multiplexing transmission systems An optical demultiplexing unit;
A receiving side wavelength division demultiplexing device comprising:
A wavelength division multiplexing system comprising:
The wavelength of the optical transmission unit for the one or more high-density wavelength division multiplexing transmission systems and the wavelength of the optical reception unit for the one or more high-density wavelength division multiplexing transmission systems are the wavelength transmission characteristics and the optical distribution of the optical multiplexing unit. A wavelength division multiplexing system characterized in that the wavelength division multiplexing system is determined based on quality characteristics influenced by wavelength transmission characteristics of the wave unit.

(Appendix 8)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
One or more optical transmission units for a high-density wavelength division multiplexing transmission system;
For multiplexing light output from the one or more optical transmission units for the low-density wavelength division multiplexing transmission system and light output from the optical transmission unit for the one or more high-density wavelength division multiplexing systems. An optical multiplexing unit,
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
One or more optical receiver units for the high-density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the high-density wavelength division multiplex transmission system;
Distributing light input from the transmission side wavelength division multiplexing apparatus to the one or more optical receiving units for the low density wavelength division multiplexing transmission system and the optical receiving unit for the one or more high density wavelength division multiplexing transmission systems An optical demultiplexing unit;
A receiving side wavelength division demultiplexing device comprising:
A wavelength division multiplexing system comprising:
The wavelength of the optical transmission unit for the one or more high-density wavelength division multiplex transmission systems and the wavelength of the optical reception unit for the one or more high-density wavelength division multiplex transmission systems are set as the wavelength transmission characteristic of the optical multiplexing unit and the optical component. A wavelength division multiplexing system further comprising means for determining based on quality characteristics influenced by the wavelength transmission characteristics of the wave unit.

(Appendix 9)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
One or more optical transmission units for a high-density wavelength division multiplexing transmission system;
For multiplexing light output from the one or more optical transmission units for the low-density wavelength division multiplexing transmission system and light output from the optical transmission unit for the one or more high-density wavelength division multiplexing systems. An optical multiplexing unit,
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
One or more optical receiver units for the high-density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the high-density wavelength division multiplex transmission system;
Distributing light input from the transmission side wavelength division multiplexing apparatus to the one or more optical receiving units for the low density wavelength division multiplexing transmission system and the optical receiving unit for the one or more high density wavelength division multiplexing transmission systems An optical demultiplexing unit;
A receiving side wavelength division demultiplexing device comprising:
A wavelength division multiplexing apparatus for transmission in a wavelength division multiplexing system comprising:
The wavelength of the optical transmission unit for the one or more high-density wavelength division multiplexing transmission systems is determined based on the wavelength transmission characteristics of the optical multiplexing unit and the quality characteristics influenced by the wavelength transmission characteristics of the optical demultiplexing unit. A transmission side wavelength division multiplexing apparatus characterized by comprising:

(Appendix 10)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
One or more optical transmission units for a high-density wavelength division multiplexing transmission system;
For multiplexing light output from the one or more optical transmission units for the low-density wavelength division multiplexing transmission system and light output from the optical transmission unit for the one or more high-density wavelength division multiplexing systems. An optical multiplexing unit,
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
One or more optical receiver units for the high-density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the high-density wavelength division multiplex transmission system;
Distributing light input from the transmission side wavelength division multiplexing apparatus to the one or more optical receiving units for the low density wavelength division multiplexing transmission system and the optical receiving unit for the one or more high density wavelength division multiplexing transmission systems An optical demultiplexing unit;
A receiving side wavelength division demultiplexing device comprising:
A wavelength division multiplexing apparatus for transmission in a wavelength division multiplexing system comprising:
Means for determining a wavelength of the optical transmission unit for the one or more high-density wavelength division multiplexing transmission systems based on a wavelength characteristic of the optical multiplexing unit and a quality characteristic influenced by the wavelength transmission characteristic of the optical demultiplexing unit; The transmission side wavelength division multiplexing apparatus further comprising:

(Appendix 11)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
One or more optical transmission units for a high-density wavelength division multiplexing transmission system;
For multiplexing light output from the one or more optical transmission units for the low-density wavelength division multiplexing transmission system and light output from the optical transmission unit for the one or more high-density wavelength division multiplexing systems. An optical multiplexing unit,
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
One or more optical receiver units for the high-density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the high-density wavelength division multiplex transmission system;
Distributing light input from the transmission side wavelength division multiplexing apparatus to the one or more optical receiving units for the low density wavelength division multiplexing transmission system and the optical receiving unit for the one or more high density wavelength division multiplexing transmission systems An optical demultiplexing unit;
A receiving side wavelength division demultiplexing device comprising:
A receiving side wavelength division demultiplexing device in a wavelength division multiplexing system comprising:
The wavelength of the optical receiving unit for the one or more high-density wavelength division multiplexing transmission systems is determined based on the quality characteristics influenced by the wavelength transmission characteristics of the optical multiplexing unit and the wavelength transmission characteristics of the optical demultiplexing unit. A receiving side wavelength division multiplexing / demultiplexing device.

(Appendix 12)
One or more optical transmission units for a low density wavelength division multiplexing transmission system;
One or more optical transmission units for a high-density wavelength division multiplexing transmission system;
For multiplexing light output from the one or more optical transmission units for the low-density wavelength division multiplexing transmission system and light output from the optical transmission unit for the one or more high-density wavelength division multiplexing systems. An optical multiplexing unit,
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
One or more optical receiver units for the high-density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the high-density wavelength division multiplex transmission system;
Distributing light input from the transmission side wavelength division multiplexing apparatus to the one or more optical receiving units for the low density wavelength division multiplexing transmission system and the optical receiving unit for the one or more high density wavelength division multiplexing transmission systems An optical demultiplexing unit;
A receiving side wavelength division demultiplexing device comprising:
A receiving side wavelength division demultiplexing device in a wavelength division multiplexing system comprising:
Means for determining a wavelength of the optical receiving unit for the one or more high-density wavelength division multiplexing transmission systems based on a wavelength transmission characteristic of the optical multiplexing unit and a quality characteristic influenced by the wavelength transmission characteristic of the optical demultiplexing unit The receiving-side wavelength division demultiplexing apparatus, further comprising:

A1-Am Optical transmission unit B1-Bm Optical reception unit C1, C2, D1, D2 Optical multiplexing / demultiplexing unit E1-En Optical transmission unit F1-Fn Optical reception unit G1, G2 Monitoring control unit

Claims (8)

One or more optical transmission units for a low density wavelength division multiplexing transmission system;
An optical transmission unit for a plurality of high-density wavelength division multiplexing transmission systems;
A first optical multiplexing unit for multiplexing the light output from the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
A plurality of optical receiver units for high-density wavelength division multiplexing transmission systems respectively corresponding to the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A first optical demultiplexing unit for distributing input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
A receiving side wavelength division demultiplexing device comprising:
A wavelength division multiplexing system comprising:
The number and wavelength of the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems and / or the number and wavelength of the optical reception units for the plurality of high-density wavelength division multiplexing transmission systems are set as the first optical multiplexing unit. The wavelength transmission characteristics of the second optical multiplexing unit, the wavelength transmission characteristics of the first optical demultiplexing unit, and the quality characteristics affected by the wavelength transmission characteristics of the second optical demultiplexing unit. A wavelength division multiplexing system, further comprising means for determining based on the wavelength division multiplexing system. One or more optical transmission units for a low density wavelength division multiplexing transmission system;
An optical transmission unit for a plurality of high-density wavelength division multiplexing transmission systems;
A first optical multiplexing unit for multiplexing the light output from the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
A plurality of optical receiver units for high-density wavelength division multiplexing transmission systems respectively corresponding to the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A first optical demultiplexing unit for distributing input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
A receiving side wavelength division demultiplexing device comprising:
A signal-side wavelength-division multiplexing Heavy location feed in the wavelength division multiplexing system comprising,
The number and wavelength of the plurality of optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems are defined as wavelength transmission characteristics of the first optical multiplexing unit, wavelength transmission characteristics of the second optical multiplexing unit, and the first light. The transmission-side wavelength division multiplexing apparatus further comprising means for determining based on a wavelength characteristic of the demultiplexing unit and a quality characteristic influenced by the wavelength transmission characteristic of the second optical demultiplexing unit. One or more optical transmission units for a low density wavelength division multiplexing transmission system;
An optical transmission unit for a plurality of high-density wavelength division multiplexing transmission systems;
A first optical multiplexing unit for multiplexing the light output from the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
A plurality of optical receiver units for high-density wavelength division multiplexing transmission systems respectively corresponding to the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
A first optical demultiplexing unit for distributing input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems;
A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
A receiving side wavelength division demultiplexing device comprising:
A receiving side wavelength division demultiplexing device in a wavelength division multiplexing system comprising:
The number and wavelength of the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems are set as the wavelength transmission characteristic of the first optical multiplexing unit, the wavelength transmission characteristic of the second optical multiplexing unit, and the first light. A receiving-side wavelength division demultiplexing apparatus, further comprising means for determining based on a wavelength transmission characteristic of the demultiplexing unit and a quality characteristic influenced by the wavelength transmission characteristic of the second optical demultiplexing unit.   One or more optical transmission units for a low density wavelength division multiplexing transmission system;
  An optical transmission unit for a plurality of high-density wavelength division multiplexing transmission systems;
  A first optical multiplexing unit for multiplexing the light output from the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
  A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
  A transmission side wavelength division multiplexing device comprising:
  One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
  A plurality of optical receiver units for high-density wavelength division multiplexing transmission systems respectively corresponding to the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems;
  A first optical demultiplexing unit for distributing input light to the optical receiving units for the plurality of high-density wavelength division multiplexing transmission systems;
  A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
  A receiving side wavelength division demultiplexing device comprising:
  An apparatus for selection for a wavelength division multiplexing system comprising:
  The number and wavelength of the optical transmission units for the plurality of high-density wavelength division multiplexing transmission systems and / or the number and wavelength of the optical reception units for the plurality of high-density wavelength division multiplexing transmission systems are set as the first optical multiplexing unit. The wavelength transmission characteristics of the second optical multiplexing unit, the wavelength transmission characteristics of the first optical demultiplexing unit, and the quality characteristics affected by the wavelength transmission characteristics of the second optical demultiplexing unit. A selection device comprising means for deciding on the basis of the selection device. One or more optical transmission units for a low density wavelength division multiplexing transmission system;
One or more optical transmission units for a high-density wavelength division multiplexing transmission system;
To multiplex the light output from the one or more low-density wavelength division multiplex transmission system optical transmission units and the light output from the one or more high-density wavelength division multiplex transmission system optical transmission units Optical multiplexing unit,
A transmission side wavelength division multiplexing device comprising:
One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
One or more optical receiver units for the high-density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the high-density wavelength division multiplex transmission system;
Distributing light input from the transmission side wavelength division multiplexing apparatus to the one or more optical receiving units for the low density wavelength division multiplexing transmission system and the optical receiving unit for the one or more high density wavelength division multiplexing transmission systems An optical demultiplexing unit;
A receiving side wavelength division demultiplexing device comprising:
A wavelength division multiplexing system comprising:
The wavelength of the optical transmission unit for the one or more high-density wavelength division multiplex transmission systems and / or the wavelength of the optical reception unit for the one or more high-density wavelength division multiplex transmission systems are defined as the wavelength transmission characteristics of the optical multiplexing unit and The wavelength division multiplexing system further comprising means for determining based on a quality characteristic influenced by a wavelength transmission characteristic of the optical demultiplexing unit.   One or more optical transmission units for a low density wavelength division multiplexing transmission system;
  One or more optical transmission units for a high-density wavelength division multiplexing transmission system;
  A first optical multiplexing unit for multiplexing light output from the optical transmission unit for the one or more high-density wavelength division multiplexing transmission systems;
  A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
  A transmission side wavelength division multiplexing device comprising:
  One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
  One or more optical receiver units for the high-density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the high-density wavelength division multiplex transmission system;
  A first optical demultiplexing unit for distributing input light to the one or more optical receiving units for the high-density wavelength division multiplexing transmission system;
  A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
  A receiving side wavelength division demultiplexing device comprising:
  A wavelength division multiplexing apparatus for transmission in a wavelength division multiplexing system comprising:
  The wavelength of the optical transmission unit for the one or more high-density wavelength division multiplex transmission systems is defined as a wavelength transmission characteristic of the first optical multiplexing unit, a wavelength transmission characteristic of the second optical multiplexing unit, and the first optical component. The transmission side wavelength division multiplexing apparatus further comprising means for determining based on a wavelength characteristic of the wave unit and a quality characteristic influenced by the wavelength transmission characteristic of the second optical demultiplexing unit.   One or more optical transmission units for a low density wavelength division multiplexing transmission system;
  One or more optical transmission units for a high-density wavelength division multiplexing transmission system;
  A first optical multiplexing unit for multiplexing light output from the optical transmission unit for the one or more high-density wavelength division multiplexing transmission systems;
  A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
  A transmission side wavelength division multiplexing device comprising:
  One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
  One or more optical receiver units for the high-density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the high-density wavelength division multiplex transmission system;
  A first optical demultiplexing unit for distributing input light to the one or more optical receiving units for the high-density wavelength division multiplexing transmission system;
  A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
  A receiving side wavelength division demultiplexing device comprising:
  A receiving side wavelength division demultiplexing device in a wavelength division multiplexing system comprising:
  The wavelength of the optical receiving unit for the one or more high-density wavelength division multiplexing transmission systems is defined as a wavelength transmission characteristic of the first optical multiplexing unit, a wavelength transmission characteristic of the second optical multiplexing unit, and the first optical component. The receiving-side wavelength division demultiplexing device further comprising means for determining based on a wavelength characteristic of the wave unit and a quality characteristic influenced by the wavelength transmission characteristic of the second optical demultiplexing unit.   One or more optical transmission units for a low density wavelength division multiplexing transmission system;
  One or more optical transmission units for a high-density wavelength division multiplexing transmission system;
  A first optical multiplexing unit for multiplexing light output from the optical transmission unit for the one or more high-density wavelength division multiplexing transmission systems;
  A second optical multiplexing unit for multiplexing the light output from the optical transmission unit for the one or more low density wavelength division multiplexing transmission systems and the light output from the first optical multiplexing unit;
  A transmission side wavelength division multiplexing device comprising:
  One or more optical receiver units for the low density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the low density wavelength division multiplex transmission system;
  One or more optical receiver units for the high-density wavelength division multiplex transmission system respectively corresponding to the one or more optical transmission units for the high-density wavelength division multiplex transmission system;
  A first optical demultiplexing unit for distributing input light to the one or more optical receiving units for the high-density wavelength division multiplexing transmission system;
  A second optical demultiplexing unit for distributing the light input from the transmission side wavelength division multiplexing apparatus to the one or more low-density wavelength division multiplexing transmission systems and the first optical demultiplexing unit; ,
  A receiving side wavelength division demultiplexing device comprising:
  An apparatus for selection for a wavelength division multiplexing system comprising:
  The wavelength of the optical transmission unit for the one or more high-density wavelength division multiplexing transmission systems and / or the wavelength of the optical reception unit for the one or more high-density wavelength division multiplexing transmission systems is the wavelength of the first optical multiplexing unit. Based on transmission characteristics, wavelength transmission characteristics of the second optical multiplexing unit, wavelength transmission characteristics of the first optical demultiplexing unit, and quality characteristics affected by the wavelength transmission characteristics of the second optical demultiplexing unit A selection device comprising means for determining.

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