CN103650380B

CN103650380B - The crosstalk method and apparatus of cost of a kind of attenuating

Info

Publication number: CN103650380B
Application number: CN201380001090.XA
Authority: CN
Inventors: 宗良佳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-07-19
Filing date: 2013-07-19
Publication date: 2016-05-25
Anticipated expiration: 2033-07-19
Also published as: WO2015006983A1; CN103650380A

Abstract

The invention provides the crosstalk method and apparatus of cost of a kind of reduction, comprising: join transmission path to upper ripple signal component; On described transmission path, choose a coupling frequency spectrum resource, described coupling frequency spectrum resource be continuous and spectrum width be greater than all upper ripple signals in described upper ripple signal group spectrum width and; Dwindle and the described filtering bandwidth that mates at least one through connect signal that frequency spectrum resource is adjacent; Join described coupling frequency spectrum resource to described upper ripple signal component, make described upper ripple signal group and the through connect signal next-door neighbour who dwindles filtering bandwidth; Due in the time dwindling through connect signal filtering bandwidth, can dwindle accordingly under Xia road after ripple signal, remain in the spectral components at through connect signal edge, thereby reduce crosstalk signal component, without reserved a part of bandwidth on coupling frequency spectrum resource, not only improve system spectral resources utilization rate, can also effectively suppress the cost of crosstalking.

Description

Method and device for reducing crosstalk cost

Technical Field

The present invention relates to the field of optical communication technologies, and in particular, to a method and an apparatus for reducing crosstalk cost.

Background

With the continuous development of communication technology, the topology structure of the point-to-point line communication sub-network in the traditional optical communication system cannot meet the requirement of communication development, and the topology structure of the whole network gradually develops towards the wireless network Mesh (Mesh). In order to ensure the transparency of an optical network and avoid excessive optical-electrical-optical conversion, in a dense optical wave multiplexing (DWDM) system, parameters of a reconfigurable optical add-drop multiplexer (ROADM) are remotely configured to perform optical scheduling, so that service wavelengths can be dynamically added and dropped, and when network topology or service distribution changes, the response can be rapidly performed, so that the optical network is more intelligent, and flexible scheduling of services is realized.

However, the use of RODAM may bring crosstalk cost to the transmission of optical signals, which is caused by the reason shown in fig. 1: for a certain dimension in ROADM, a drop center wavelength λ is required₁And simultaneously, a service signal with the same wavelength is added. Selecting a center wavelength λ of a drop by a Wavelength Selective Switch (WSS) due to an imperfection of a filter curve of the WSS₁In time, the original center wavelength λ cannot be adjusted₁Will generate some central wavelengths lambda at the edges of the channel₁The residual spectrum of (3). Due to the up wave signal of the up path and the central wavelength lambda of the down path₁Will occupy the same wavelength as the central wavelength lambda₁The same spectral resource, and thus, the center wavelength λ₁The residual spectrum of (a) becomes crosstalk of the up-wave signal, i.e. a crosstalk cost is generated. The crosstalk is transmitted along with the uplink signal, and since the crosstalk component has the same frequency spectrum as the uplink signal component, it is difficult to cancel the crosstalk component once entering the uplink signal, thereby affecting the transmission performance of the traffic signal.

At present, in order to suppress the influence of crosstalk cost on an Orthogonal Frequency Division Multiplexing (OFDM) signal in a WDM system, a commonly used method for reducing the crosstalk cost is shown in fig. 2: the input signal is passed through the ROADM drop-wave signal, the drop-wave signal is assumed to be 4 sub-carrier signals, and because the wavelength selection switch in the ROADM can not provide a perfect filtering curve, some spectral components still remain at the original spectral edge position of the drop-wave signal, and the spectral components become crosstalk of the up-wave signal. In order to reduce crosstalk cost, when a new uplink signal is added, a certain protection bandwidth is reserved between the uplink signal and the through signal, so that the number of subcarriers of the uplink signal is reduced, and crosstalk of residual spectral components to the uplink signal is reduced. As shown in fig. 3, the uplink up-wave signal is 3 subcarriers of the same wavelength.

When the method reduces the crosstalk cost, the following disadvantages exist:

in order to suppress crosstalk cost, a certain protection bandwidth is reserved when an add-on signal of a ROADM is added, so that the waste of system spectrum resources is caused;

secondly, in order to ensure that the transmission capacity is not changed, when an upper-path signal is transmitted, a higher-order modulation mode is required to be adopted than a lower-path signal, the higher the modulation order is, the higher the crosstalk cost caused by the same residual spectral component is, the method cannot well inhibit the influence of the crosstalk cost, and the transmission distance of the signal is shortened by adopting the higher-order modulation mode.

Disclosure of Invention

In view of this, the present invention provides a method and an apparatus for reducing crosstalk cost, which can reduce the influence of crosstalk cost without reserving a protection bandwidth.

A first aspect of an embodiment of the present invention provides a method for reducing crosstalk cost, where the method includes:

distributing transmission paths to the up-wave signal groups, wherein each up-wave signal group comprises at least one up-wave signal with the same transmission path;

selecting a matched spectrum resource on the transmission path, wherein the matched spectrum resource is continuous and has a spectrum width larger than the sum of the spectrum widths of all the upgoing signals in the upgoing signal group;

narrowing a filtering bandwidth of at least one pass-through signal adjacent to the matched spectral resource;

and allocating the matched spectrum resources to the up-wave signal group, so that the up-wave signal group is adjacent to the through signal with the reduced filtering bandwidth.

In a first possible implementation manner of the first aspect of the embodiments of the present invention, the selecting a matching spectrum resource on the transmission path includes:

searching a through signal which is the same as the transmission path of the up-wave signal group on the transmission path;

selecting a matching spectrum resource adjacent to the through signal;

said narrowing the filtering bandwidth of at least one through signal adjacent to said matching spectral resource comprises:

the filter bandwidth of the through signal is reduced, which is the same as the transmission path of the up-wave signal group.

In a second possible implementation manner of the first aspect of the embodiments of the present invention, the up-wave signal group includes two or more up-wave signals with the same transmission path, an up-wave signal in the up-wave signal group that is least affected by crosstalk cost is used as a low crosstalk sensitivity signal, and the allocating the matched spectrum resource to the up-wave signal group includes:

and distributing the crosstalk area of the matched frequency spectrum resource to the low crosstalk sensitivity signal in the uplink signal group, and distributing the non-crosstalk area of the matched frequency offset resource to other uplink signals in the uplink signal group.

With reference to the second possible implementation manner of the first aspect of the embodiment of the present invention, in a third possible implementation manner, the uplink signals include two uplink signals with the same transmission path, one of the uplink signal groups, which is least affected by crosstalk cost, is taken as a low crosstalk sensitivity signal, the allocating the crosstalk area of the matched frequency spectrum resource to the low crosstalk sensitivity signal of the uplink signal group, and the allocating the non-crosstalk area of the matched frequency offset resource to other uplink signals of the uplink signal group includes:

assigning a region of the matched spectral resources immediately adjacent to a pass-through signal to the low crosstalk susceptibility signal such that the low crosstalk susceptibility signal is immediately adjacent to the pass-through signal;

assigning a region of the matched spectral resources immediately adjacent to the low crosstalk sensitivity signal to another upwave signal such that the other upwave signal is immediately adjacent to the low crosstalk sensitivity signal.

With reference to the second possible implementation manner of the first aspect of the embodiment of the present invention, in a fourth possible implementation manner, the uplink signal group includes more than two uplink signals with the same transmission path, the two uplink signals with the smallest influence of crosstalk cost in the uplink signal group are used as low crosstalk sensitivity signals, the allocating the crosstalk area of the matched frequency spectrum resource to the low crosstalk sensitivity signals in the uplink signal group, and the allocating the non-crosstalk area of the matched frequency offset resource to other uplink signals in the uplink signal group includes:

sorting the upper wave signals in the upper wave signal group, arranging two low crosstalk sensitivity signals at two ends, and arranging other upper wave signals in the middle;

and allocating any one of the matched spectrum resources adjacent to the through signal to the arranged up-wave signal group, so that the arranged up-wave signal group is adjacent to the through signal.

With reference to the fourth possible implementation manner of the first aspect of the embodiment of the present invention, in a fifth possible implementation manner, the arranging other upper wave signals in the middle includes:

and sequentially arranging other up-wave signals from the middle to two sides according to the modulation order from high to low.

With reference to the first aspect to the fifth possible implementation manner of the first aspect of the embodiment of the present invention, in a sixth possible implementation manner, the reducing a filtering bandwidth of at least one through signal adjacent to the matched spectrum resource includes:

reducing a filtering bandwidth of at least one through signal adjacent to the matched spectral resource by a wavelength selective switch.

With reference to the first aspect to the fifth possible implementation manner of the first aspect of the embodiment of the present invention, in a seventh possible implementation manner, before allocating transmission paths to an upwave signal group, the method further includes:

dividing each upwave signal into an upwave signal group;

or,

the up-wave signals with the same transmission path are divided into one up-wave signal group.

A second aspect of the embodiments of the present invention provides a method for reducing crosstalk cost, where the method includes:

distributing transmission paths to an upper wave signal group, wherein the upper wave signal group comprises at least two upper wave signals with the same transmission paths, and the upper wave signal with the minimum influence of crosstalk cost in the upper wave signal group is used as a low crosstalk sensitivity signal;

and distributing the crosstalk areas of the matched spectrum resources to the low crosstalk sensitivity signals in the uplink signal group, and distributing the non-crosstalk areas of the matched spectrum resources to other uplink signals in the uplink signal group.

In a first possible implementation manner of the second aspect of the embodiments of the present invention, the up-wave signals include two up-wave signals with the same transmission path, one up-wave signal of the up-wave signal group that is least affected by crosstalk cost is used as a low crosstalk sensitivity signal, the allocating the crosstalk area of the matching spectrum resource to the low crosstalk sensitivity signal of the up-wave signal group, and the allocating the non-crosstalk area of the matching spectrum resource to other up-wave signals of the up-wave signal group includes:

In a second possible implementation manner of the second aspect of the embodiment of the present invention, the uplink signal group includes more than two uplink signals with the same transmission path, where two uplink signals with the smallest influence of crosstalk cost in the uplink signal group are used as low crosstalk sensitivity signals, the allocating a crosstalk area of the matching frequency spectrum resource to a low crosstalk sensitivity signal in the uplink signal group, and the allocating a non-crosstalk area of the matching frequency offset resource to other uplink signals in the uplink signal group includes:

sorting the upwave signals in the upwave signal group, arranging two low crosstalk sensitivity signals at two ends, and arranging other upwave signals in the upwave signal group in the middle;

With reference to the second aspect of the embodiment of the present invention to the second possible implementation manner of the second aspect, in a third possible implementation manner, before allocating transmission paths to an upwave signal group, the method further includes:

dividing each upwave signal into an upwave signal group;

or,

A third aspect of the embodiments of the present invention provides a device for reducing crosstalk cost, where the device includes:

the first path distribution module is used for distributing transmission paths to the upper wave signal groups, and each upper wave signal group comprises at least one upper wave signal with the same transmission path;

a first resource selection module, configured to select a matching spectrum resource on the transmission path, where the matching spectrum resource is continuous and has a spectrum width greater than a sum of spectrum widths of all the upgoing signals in the upgoing signal group;

a bandwidth reduction module for reducing a filtering bandwidth of at least one pass signal adjacent to the matched spectrum resource;

and the first spectrum allocation module is used for allocating the matched spectrum resources to the up-wave signal group, so that the up-wave signal group is adjacent to the through signal with the reduced filtering bandwidth.

In a first possible implementation manner of the third aspect of the embodiment of the present invention, the first resource selecting module includes:

a searching unit configured to search for a through signal on the transmission path that is the same as the transmission path of the up-wave signal group;

a selecting unit, configured to select a matching spectrum resource adjacent to the through signal;

the bandwidth reduction module comprises:

and a narrowing unit configured to narrow a filter bandwidth of a through signal that is the same as the transmission path of the up-wave signal group.

In a second possible implementation manner of the third aspect of the embodiment of the present invention, the up-wave signal group includes two or more up-wave signals with the same transmission path, and the up-wave signal with the smallest influence of crosstalk cost in the up-wave signal group is used as a low crosstalk sensitivity signal, where the first spectrum allocation module includes:

and the first allocation unit is used for allocating the crosstalk area of the matched frequency spectrum resource to the low crosstalk sensitivity signal in the uplink signal group and allocating the non-crosstalk area of the matched frequency offset resource to other uplink signals in the uplink signal group.

With reference to the second possible implementation manner of the third aspect of the embodiment of the present invention, in a third possible implementation manner, the uplink signals include two uplink signals with the same transmission path, and one of the uplink signal groups, which is least affected by crosstalk cost, is taken as a low crosstalk sensitivity signal, where the first allocating unit includes:

a first allocating subunit, configured to allocate a region of the matching spectral resource that is immediately adjacent to a through signal to the low crosstalk sensitivity signal, so that the low crosstalk sensitivity signal is immediately adjacent to the through signal;

a second sub-allocation unit, configured to allocate a region of the matched spectrum resource that is immediately adjacent to the low crosstalk sensitivity signal to another uplink signal, so that the another uplink signal is immediately adjacent to the low crosstalk sensitivity signal.

With reference to the second possible implementation manner of the third aspect of the embodiment of the present invention, in a fourth possible implementation manner, the up-wave signal group includes more than two up-wave signals with the same transmission path, and the two up-wave signals with the smallest influence of crosstalk cost in the up-wave signal group are taken as low crosstalk sensitivity signals, where the first allocating unit includes:

a sorting subunit, configured to sort the upgoing signals in the upgoing signal group, arrange two low crosstalk sensitivity signals at two ends, and arrange the other upgoing signals in the middle;

and the third distributing subunit is used for distributing any one of the matching spectrum resources adjacent to the through signal to the arranged up-wave signal group, so that the arranged up-wave signal group is adjacent to the through signal.

With reference to the third aspect to the fourth possible implementation manner of the third aspect of the embodiment of the present invention, in a fifth possible implementation manner, the apparatus further includes:

the first grouping module is used for dividing each upwave signal into an upwave signal group;

or,

for dividing the up-wave signals with the same transmission path into one up-wave signal group.

A fourth aspect of the embodiments of the present invention provides a device for reducing crosstalk cost, where the device includes:

the second path distribution module is used for distributing transmission paths to an upper wave signal group, the upper wave signal group comprises at least two upper wave signals with the same transmission paths, and the upper wave signal with the minimum influence of crosstalk cost in the upper wave signal group is used as a low crosstalk sensitivity signal;

a second resource selection module, configured to select a matching spectrum resource on the transmission path, where the matching spectrum resource is continuous and has a spectrum width greater than a sum of spectrum widths of all the upgoing signals in the upgoing signal group;

and the second spectrum allocation module is used for allocating the crosstalk areas of the matched spectrum resources to the low crosstalk sensitivity signals in the upwave signal group and allocating the non-crosstalk areas of the matched spectrum resources to other upwave signals in the upwave signal group.

In a first possible implementation manner of the fourth aspect of the present invention, the up-wave signals include two up-wave signals with the same transmission path, and one of the up-wave signals in the up-wave signal group that is least affected by crosstalk cost is used as a low crosstalk sensitivity signal, where the second spectrum allocation module includes:

a second allocating unit, configured to allocate an area in the matching spectrum resource that is immediately adjacent to a through signal to the low crosstalk sensitivity signal, so that the low crosstalk sensitivity signal is immediately adjacent to the through signal;

a third allocating unit, configured to allocate a region of the matched spectrum resource that is immediately adjacent to the low crosstalk sensitivity signal to another uplink signal, so that the another uplink signal is immediately adjacent to the low crosstalk sensitivity signal.

In a second possible implementation manner of the fourth aspect of the embodiment of the present invention, the up-wave signal group includes more than two up-wave signals with the same transmission path, and two up-wave signals with the smallest influence of crosstalk cost in the up-wave signal group are used as low crosstalk sensitivity signals, where the second spectrum allocation module includes:

the sequencing unit is used for sequencing the upgoing signals in the upgoing signal group, arranging two signals with low crosstalk sensitivity at two ends and arranging other upgoing signals in the upgoing signal group in the middle;

a fourth distributing unit, configured to distribute any one of the matching spectrum resources adjacent to the through signal to the arranged up-wave signal group, so that the arranged up-wave signal group is immediately adjacent to the through signal.

With reference to the fourth aspect of the present invention to the second possible implementation manner of the fourth aspect, in a third possible implementation manner, the apparatus further includes:

the second grouping module is used for dividing each upwave signal into an upwave signal group;

or,

From the above, the present invention has the following advantages:

the embodiment of the invention provides a method for reducing crosstalk cost, which is used for allocating transmission paths to upper wave signal groups; selecting a matching spectrum resource on the transmission path; narrowing a filtering bandwidth of at least one pass-through signal adjacent to the matched spectral resource; the matched spectrum resources are distributed to the upper wave signal group, and because the spectrum components remained at the edge of the through signal after the lower wave signal is correspondingly reduced when the filtering bandwidth of the through signal is reduced, the crosstalk cost is reduced, a part of protection bandwidth does not need to be reserved on the matched spectrum resources, and the utilization rate of the spectrum resources in the system is improved;

the embodiment of the invention also provides a method for reducing crosstalk cost, which is characterized in that transmission paths are distributed to an upper wave signal group, the upper wave signal group comprises at least two upper wave signals with the same transmission paths, and the upper wave signal with the minimum influence of the crosstalk cost in the upper wave signal group is used as a low crosstalk sensitivity signal; selecting a matched spectrum resource on the transmission path, wherein the matched spectrum resource is continuous and has a spectrum width larger than the sum of the spectrum widths of all the upgoing signals in the upgoing signal group; distributing the crosstalk area of the matched spectrum resource to the low crosstalk sensitivity signal in the upper wave signal group, distributing the non-crosstalk area of the matched spectrum resource to other upper wave signals in the upper wave signal group, distributing the low crosstalk sensitivity signal in the crosstalk area with the residual spectrum component because the low crosstalk sensitivity signal is less influenced by the residual spectrum component, distributing other high crosstalk sensitivity signal which is more influenced than the low crosstalk sensitivity signal by the crosstalk cost in the non-crosstalk area without the residual spectrum component, and not reserving a certain protection bandwidth.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a diagram illustrating the cause of crosstalk penalty in the prior art;

FIG. 2 is a schematic diagram of a prior art method for reducing crosstalk costs;

fig. 3 is a schematic diagram of a simulation result of optical signal-to-noise ratio cost due to crosstalk cost of uplink signals with different modulation formats and different bit rates;

FIG. 4 is a flow chart illustrating an embodiment of a method for reducing crosstalk cost according to the present invention;

FIG. 5 is a schematic diagram of a continuous spectrum signal entering a ROADM system for post-wave post-crosstalk signals;

FIG. 6 is a schematic diagram of idle spectrum resources after a continuous spectrum signal enters a ROADM system;

FIG. 7 is a schematic diagram of the present invention for reducing the filtering bandwidth of at least one through signal adjacent to the matched spectrum resource;

fig. 8(a) is a schematic diagram of the crosstalk signal after only reducing the filtering bandwidth 701 of the direct signal 2 and the adjacent side of the idle spectrum resource 2 according to the present invention;

fig. 8(b) is a schematic diagram of the crosstalk signal after only reducing the filtering bandwidth 702 of the adjacent side of the through signal 3 and the idle spectrum resource 2 according to the present invention;

fig. 8(c) is a schematic diagram of the crosstalk signal after reducing the filtering bandwidths 701 and 702 of the idle spectrum resources 2 and the adjacent sides of the through signal 2 and the through signal 3 simultaneously according to the present invention;

FIG. 9(a) is a schematic diagram of the close proximity of a first up-wave signal group and a through-signal 2 with reduced filtering bandwidth according to the present invention;

FIG. 9(b) is a diagram showing the close proximity of the first upwave signal group and the through signal 3 with reduced filtering bandwidth according to the present invention;

FIG. 10 is a flow chart illustrating an embodiment of a method for reducing crosstalk cost according to the present invention;

FIG. 11(a) is a schematic diagram illustrating the reduction of the filter bandwidth of the through signal in the same transmission path as the up-wave signal group according to the present invention;

FIG. 11(b) is a schematic diagram of the crosstalk signal after reducing the filtering bandwidth of the through signal in the same transmission path as the up-wave signal group according to the present invention;

FIG. 12(a) is a diagram illustrating the allocation of matched spectrum resources to a fourth set of upwave signals according to the present invention;

FIG. 12(b) is a diagram illustrating the allocation of matching spectrum resources to a third upwave signal group according to the present invention;

FIG. 13 is a flowchart of an embodiment of a method for reducing crosstalk costs according to the present invention;

FIG. 14 is a schematic diagram of the idle spectrum resources after the descending of a continuous spectrum signal according to the present invention;

fig. 15(a) is a schematic diagram of the present invention allocating the region of the matched spectrum resource 9 immediately adjacent to the through signal 11 to the fifth group of upwave signals;

fig. 15(b) is a schematic diagram of the present invention allocating the region of the matched spectrum resource 9 immediately adjacent to the through signal 12 to the fifth group of upwave signals;

FIG. 15(c) is a diagram illustrating the allocation of the matched spectrum resource 8 to the third upwave signal group according to the present invention;

FIG. 16 is a diagram illustrating a fourth structure of an apparatus for reducing crosstalk cost according to an embodiment of the present invention;

FIG. 17 is a schematic structural diagram of a fifth embodiment of an apparatus for reducing crosstalk cost according to the present invention;

FIG. 18 is a diagram illustrating a sixth structure of an apparatus for reducing crosstalk cost according to an embodiment of the present invention;

FIG. 19 is a diagram illustrating a seventh structure of an apparatus for reducing crosstalk according to an embodiment of the present invention;

fig. 20 is a schematic structural diagram of an embodiment of an apparatus for reducing crosstalk cost according to the present invention.

Detailed Description

In order to provide an implementation scheme for reducing crosstalk costs without reserving a certain protection bandwidth, embodiments of the present invention provide a method and an apparatus for reducing crosstalk costs, and the following describes preferred embodiments of the present invention with reference to the drawings in the specification, it should be understood that the preferred embodiments described herein are only used for illustrating and explaining the present invention, and are not used to limit the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The following detailed description of specific embodiments of the invention refers to the accompanying drawings

First, a simulation result of optical signal to noise ratio cost due to crosstalk cost of uplink signals with different modulation formats and different bit rates is explained.

Fig. 3 is a schematic diagram of a simulation result of osnr penalty due to crosstalk penalty of up-wave signals with different modulation formats and different bit rates. As can be seen from the figure: the sensitivity of the uplink signals of the 10G-bit rate non-return-to-zero modulation format (NRZ), the 40G-bit rate return-to-zero differential quadrature phase shift keying modulation format (RZ-DQPSK) and the 100G-bit rate polarization multiplexing quadrature phase shift keying modulation format (PDM-QPSK) to the crosstalk cost is substantially the same, and as shown in the figure, the three uplink signals generate an optical signal-to-noise ratio (OSNR) cost of 0.5dB, which corresponds to a crosstalk size of-20 dB. At present, the crosstalk of WSS is nominally between-30 dB and-35 dB. Therefore, for the existing modulation formats with 10G, 40G and 100G bit rates, the crosstalk penalty caused by the residual spectral components after the downlink signal of the ROADM system to the uplink signal is not very significant.

However, with the rapid increase of the number of internet users, application types, network bandwidth, etc., the capacity of the network is continuously expanded to meet the service requirement, and a single channel line in the optical network has a higher bit rate of 400G or even 1T, etc. In order to achieve a higher bit rate, a high-order modulation scheme (such as 16 Quadrature Amplitude Modulation (QAM), 32QAM, etc.) or a multi-carrier Orthogonal Frequency Division Multiplexing (OFDM) technique is required. Therefore, in a variable bandwidth optical network (FBON), a phenomenon of mixed transmission of up-wave signals of a plurality of bit rates and a plurality of modulation formats occurs.

In FBON with hybrid transmission, the up-wave signals with modulation formats of 10G, 40G and 100G bit rates still suffer less from crosstalk penalty. However, for a higher order modulated upwave signal in FBON, the corresponding crosstalk value is smaller in magnitude while producing the same optical signal-to-noise ratio penalty. As shown in fig. 3, generating a 0.5dBOSNR penalty for an up-wave signal of a 16QAM modulation format corresponds to a crosstalk magnitude of-27 dB. Similarly, for a multi-carrier up-wave signal, since the residual spectral components at the edge of the through signal are close to the center frequency of the edge carrier, the crosstalk cost of the residual spectral components to the edge carrier is also very large. In summary, for FBON, the crosstalk penalty incurred by ROADM is not negligible for high order modulation or multi-carrier up signals.

The low crosstalk sensitivity signal and the high crosstalk sensitivity signal are relative concepts, not absolute concepts, and not all of the high order modulated up signals are high crosstalk sensitivity signals. In the plurality of up-wave signals included in one up-wave signal group, the signal less affected by crosstalk cost is a low crosstalk sensitivity signal, and the signal more affected by crosstalk cost is a high crosstalk sensitivity signal. For example, when the uplink signal of the 16QAM modulation format is a high crosstalk sensitivity signal, the low crosstalk sensitivity signal may be the uplink signal of the 8QAM modulation format. For the multi-carrier modulation signal, no matter what modulation method is adopted, the crosstalk cost is large, and the signal is used as a high crosstalk sensitivity signal. In one up-wave signal group, one or two up-wave signals with the least influence of crosstalk cost are used as low crosstalk sensitivity signals, and other up-wave signals are used as high crosstalk sensitivity signals.

It should be noted that, in the specific embodiments of the present invention described below, the low crosstalk sensitivity signal is exemplified by a low-order modulation signal; the high crosstalk sensitivity signal is exemplified by a high order modulation signal or a multi-carrier modulation signal.

Example one

Fig. 4 is a flow chart of an embodiment of a method for reducing crosstalk cost according to the present invention, where the method includes:

step 401: the transmission paths are assigned to groups of up-wave signals, each group of up-wave signals including at least one up-wave signal having the same transmission path.

The transmission paths are assigned to the upstream signal groups, i.e., each upstream signal of the upstream signal group is assigned the same routing information.

When a set of continuous spectrum signals enters the ROADM system, the spectrum signals include a through signal and a down signal, and after the spectrum signals are filtered by the WSS, the spectrum components remain at the edge of the through signal adjacent to the down signal, as shown in fig. 5.

When a plurality of add-wave signals exist in the ROADM system, each add-wave signal can be independently used as an add-wave signal group, that is, only one add-wave signal exists in each add-wave signal group; the up-wave signals with the same transmission path may also be regarded as one up-wave signal group, and each up-wave signal group may be composed of one or more up-wave signals with the same transmission path. If there are more upwave signals with the same transmission path, the upwave signals with the same transmission path can be further divided into a plurality of upwave signal groups according to actual needs. And specific limiting conditions can be set according to actual requirements to group the plurality of uplink signals, and the number of the uplink signals in each uplink signal group can be set according to actual conditions.

Grouping of the plurality of add signals is illustrated, assuming that there are 5 add signals in the ROADM system: the uplink signal 1 (100 GPDM-QPSK), the uplink signal 2 (dual carrier 400GPDM-16 QAM), the uplink signal 3 (40 GPDM-QPSK), the uplink signal 4 (40 GPDM-QPSK), and the uplink signal 5 (dual carrier 400GPDM-16 QAM), wherein the transmission paths of the uplink signal 1, the uplink signal 2, and the uplink signal 3 are the same, and the transmission paths of the uplink signal 4 and the uplink signal 5 are the same.

When the 5 up-wave signals are grouped, each up-wave signal can be used as one up-wave signal group, that is, there are 5 up-wave signal groups; it is also possible to divide the upwave signals with the same transmission path into one upwave signal group, that is, there are 2 upwave signal groups, where one upwave signal group includes upwave signal 1, upwave signal 2, and upwave signal 3, and the other upwave signal group includes upwave signal 4 and upwave signal 5.

The above specific example is only used to exemplify the grouping of the plurality of uplink signals, and is not limited to the above grouping manner, and the manner of grouping the plurality of uplink signals may be set according to the actual situation.

In the embodiment of the present invention, a Path Computation Element (PCE) is used to allocate a transmission path to an uplink signal packet, and generally, a shortest transmission path is preferentially selected.

Step 402: and selecting a matched spectrum resource on the transmission path, wherein the matched spectrum resource is continuous and has a spectrum width larger than the sum of the spectrum widths of all the upgoing signals in the upgoing signal group.

After the transmission path is selected, a plurality of downlink signals are provided on the transmission path, and each downlink signal obtains an idle spectrum resource, as shown in fig. 6, a matching spectrum resource is selected from the plurality of idle spectrum resources for each uplink signal group, and the selected idle spectrum resource is allocated to the uplink signal. The matching spectrum resource is a continuous section of spectrum resource, and the spectrum width of the spectrum resource is larger than the sum of the spectrum widths of all the upgoing signals in the upgoing signal group.

For example, assume that there are 5 up-wave signals in a ROADM system: the uplink signal 1 (100 GPDM-QPSK), the uplink signal 2 (dual carrier 400GPDM-16 QAM), the uplink signal 3 (40 GPDM-QPSK), the uplink signal 4 (40 GPDM-QPSK), and the uplink signal 5 (dual carrier 400GPDM-16 QAM).

When each upwave signal is used as an upwave signal group, distributing a continuous idle spectrum resource with a spectrum width larger than that of the upwave signal 1 to the upwave signal group where the upwave signal 1 is positioned as a matched spectrum resource; and allocating a continuous idle spectrum resource with a spectrum width larger than that of the upwave signal 2 to the upwave signal group where the upwave signal 2 is located as a matching spectrum resource, and allocating matching spectrum resources to the upwave signal group where the upwave signal 3, the upwave signal 4 and the upwave signal 5 are located is similar, and details are not repeated here.

When the upwave signals with the same transmission path are divided into an upwave signal group, an upwave signal 1, an upwave signal 2 and an upwave signal 3 are used as a first upwave signal group; up-wave signal 4 and up-wave signal 5 serve as a second up-wave signal group. And allocating a continuous idle spectrum resource 2 to the first up-wave signal group, wherein the spectrum width of the idle spectrum resource 2 is greater than the sum of the spectrum widths of the three up-wave signals of the up-wave signal 1, the up-wave signal 2 and the up-wave signal 3, and the idle spectrum resource 2 is taken as a matching spectrum resource. And allocating a continuous idle spectrum resource 3 to the second up-wave signal group, wherein the spectrum width of the idle spectrum resource 3 is greater than the sum of the spectrum widths of the two up-wave signals of the up-wave signal 3 and the up-wave signal 4, and the idle spectrum resource 3 is taken as a matched spectrum resource.

If a plurality of idle spectrum resources meeting the requirements on the transmission path exist, selecting one of the idle spectrum resources as a matched spectrum resource; if no idle spectrum resource meeting the requirement exists on the transmission path, the transmission path is allocated for the uplink signal group again.

Step 403: reducing a filtering bandwidth of at least one pass signal adjacent to the matched spectral resource.

In the prior art, after a down wave signal in a transmission path is dropped, a part of spectral components remain at an edge of a through signal immediately adjacent to the down wave signal, as shown in fig. 5, the remaining spectral components may generate a crosstalk penalty for an up wave signal to be added.

In the embodiment of the present invention, when a downlink signal in a transmission path is dropped, the WSS with a variable bandwidth is used to reduce the filtering bandwidth of at least one through signal adjacent to the matched spectrum resource, and in specific implementation, the filtering bandwidth can be implemented by configuring the minimum variation granularity (slicegranularity) of Flex-ROADM. In general, the minimum variation granularity may be set at 12.5 GHZ. As shown in fig. 7, assuming that the selected matching spectrum resources are idle spectrum resource 2 and idle spectrum resource 3 that will be generated after the downlink of the down-wave signal, at least one of a filtering bandwidth 701 of the side adjacent to the through signal 2 and the idle spectrum resource 2 and a filtering bandwidth 702 of the side adjacent to the through signal 3 and the idle spectrum resource 2 may be reduced, and a filtering bandwidth 703 of the side adjacent to the through signal 3 and the idle spectrum resource 3 and a filtering bandwidth 704 of the side adjacent to the through signal 4 and the idle spectrum resource 3 may be reduced.

Due to the imperfection of the filtering curve, when the filtering bandwidth of the through signal adjacent to the matched spectrum resource is reduced, the residual spectrum signal at the edge of the through signal is reduced, and therefore the crosstalk cost generated by the residual spectrum signal is reduced. Taking reducing the filtering bandwidth of at least any one of the through signal 2 and the through signal 3 adjacent to the idle spectrum resource 2 as an example, as shown in fig. 8(a) -8 (c), fig. 8(a) is a schematic diagram after reducing the filtering bandwidth 701 of only the through signal 2 and the idle spectrum resource 2 adjacent side, it can be seen that the residual spectral component at the edge of the through signal 2 is reduced; fig. 8(b) is a schematic diagram after only reducing the filtering bandwidth 702 of the side adjacent to the idle spectrum resource 2 of the through signal 3, and it can be seen that the residual spectrum component at the edge of the through signal 3 is reduced; fig. 8(c) is a schematic diagram after simultaneously reducing the filtering bandwidth 701 of the side where the through signal 2 is adjacent to the idle spectrum resource 2 and the filtering bandwidth 702 of the side where the through signal 3 is adjacent to the idle spectrum resource 2, and it can be seen that the spectral components of the through signal 2 and the through signal 3 remaining at the edge adjacent to the idle spectrum resource 2 are both reduced. Reducing the filtering bandwidth of at least any one of the through signals 3 and 4 adjacent to the idle spectrum resource 3 is similar to the method described above, and is not described here again.

When the filtering bandwidth of the through signal is reduced, a part of the residual spectral component is filtered out, so that the size of the residual spectral component is reduced, the crosstalk cost caused by the residual spectral component is reduced, and the crosstalk cost can be reduced without reserving a part of protection bandwidth when the upper path signal is transmitted.

The above specific example is only used to exemplify the reduction of the filtering bandwidth of the through signal adjacent to the matched spectrum resource, and the reduction of the filtering bandwidth of at least one through signal adjacent to the other selected matched spectrum resource is similar to the above example, and is not described here again.

Step 404: and allocating the matched spectrum resources to the up-wave signal group, so that the up-wave signal group is adjacent to the through signal with the reduced filtering bandwidth.

When the first up-wave signal group is added, each up-wave signal in the first up-wave signal group is adjacent to each other after the addition, so that the whole first up-wave signal group is adjacent to the through signal with reduced filtering bandwidth. As shown in fig. 9(a) -9 (b), 9(a) is that the first upwave signal group is adjacent to the through signal 2 with reduced filtering bandwidth, and 9(b) is that the first upwave signal group is adjacent to the through signal 3 with reduced filtering bandwidth. When both the through-signals 2 and 3 narrow the filtering bandwidth, the first group of up-wave signals may optionally be immediately adjacent to one through-signal, similar to fig. 9(a) or fig. 9 (b). The second upgoing signal group is similar to the first upgoing signal group, and the description is omitted here.

As can be seen from the above, the embodiments of the present invention have the following advantages:

allocating transmission paths to the up-wave signal groups; selecting a matching spectrum resource on the transmission path; narrowing a filtering bandwidth of at least one pass-through signal adjacent to the matched spectral resource; the matched spectrum resources are distributed to the upper wave signal group, and because the spectrum components remained at the edge of the through signal when the filtering bandwidth of the through signal is reduced and the through signal is correspondingly reduced when the filtering bandwidth of the through signal is reduced, the crosstalk cost is reduced, a part of bandwidth does not need to be reserved on the matched spectrum resources, the utilization rate of the system spectrum resources is improved, and the crosstalk cost can be effectively inhibited.

Example two

Fig. 10 is a schematic flow chart of an embodiment of a method for reducing crosstalk cost according to the present invention, in comparison with the first embodiment, in the second embodiment, a crosstalk area is allocated to a low crosstalk sensitivity signal in an upper wave signal group, and a non-crosstalk area is allocated to other upper wave signals in the upper wave signal group, where the method includes:

step 1001: the up-wave signals with the same transmission path are divided into one up-wave signal group.

The upper wave signals with the same transmission path are divided into an upper wave signal group, all the upper wave signals in the whole upper wave signal group can be transmitted by adopting the same transmission path, the number of the transmission paths occupied by the transmission of a single upper wave signal is reduced, and the transmission and the reception of a plurality of upper wave signals are facilitated.

For example, assume that there are 5 up-wave signals in a ROADM system: an uplink signal 6 (100 GPDM-QPSK), an uplink signal 7 (dual carrier 400GPDM-16 QAM), an uplink signal 8 (40 GPDM-QPSK), an uplink signal 9 (40 GPDM-QPSK), and an uplink signal 10 (dual carrier 400GPDM-16 QAM). The transmission paths of the upgoing signal 6, the upgoing signal 7 and the upgoing signal 8 are the same, and the upgoing signals are divided into a third upgoing signal group; the transmission paths of the up-wave signal 9 and the up-wave signal 10 are the same, and the up-wave signal is divided into a fourth up-wave signal group.

Step 1002: and allocating transmission paths to the upper wave signal group, wherein the upper wave signal group comprises upper wave signals with at least one same transmission path.

Similar to the embodiments, reference is made to the description of the first embodiment, which is not repeated here.

Step 1003: and searching the transmission path for a through signal identical to the transmission path of the up-wave signal group.

Step 1004: selecting a matching spectrum resource adjacent to the through signal.

The matching spectral resources are contiguous and have a spectral width greater than the sum of the spectral widths of all of the upgoing signals in the upgoing signal group.

Because the through signal and the up-wave signal group have the same transmission path, when the edge part of the through signal close to the up-wave signal group passes through the ROADM system in the future, the WSS does not filter the through signal, and the through signal and the up-wave signal in the up-wave signal group can pass through integrally, so that the filtering cost is reduced.

As shown in fig. 11(a), the transmission paths of the through signal 6 and the third upwave signal group are the same, and the idle spectrum resources 5 adjacent to the through signal 6 are continuous and have a spectrum width greater than the sum of the spectrum widths of the upwave signal 6, the upwave signal 7 and the upwave signal 8 in the third upwave signal group, and then the idle spectrum resources 5 are selected as the matching spectrum resources of the third upwave signal group. The transmission paths of the through signal 7 and the fourth upwave signal group are the same, the idle spectrum resources 6 adjacent to the through signal 7 are continuous and the spectrum width is larger than the sum of the spectrum widths of the upwave signal 9 and the upwave signal 10 in the fourth upwave signal group, and then the idle spectrum resources 6 are selected as the matched spectrum resources of the fourth upwave signal group.

Step 1005: the filter bandwidth of the through signal is reduced, which is the same as the transmission path of the up-wave signal group.

When the filtering bandwidth of the through signal that is the same as the transmission path of the up-wave signal group is reduced, only the side of the through signal that is immediately adjacent to the matched spectrum resource may be reduced, and the other side may not be subjected to the processing of reducing the filtering bandwidth.

As shown in fig. 11(a), the filtering bandwidth of the side 1101 where the through signal 6 is adjacent to the vacant spectrum resources 5 is reduced, and the filtering bandwidth of the side 1102 where the through signal 7 is adjacent to the vacant spectrum resources 6 is reduced, as shown in fig. 11 (b).

Step 1006: and distributing the crosstalk area of the matched frequency spectrum resource to the low crosstalk sensitivity signal in the uplink signal group, and distributing the non-crosstalk area of the matched frequency offset resource to other uplink signals in the uplink signal group.

Wherein the other uplink signals include any one or more of other low crosstalk sensitivity signals, high crosstalk sensitivity signals which are influenced by crosstalk cost more than the low crosstalk sensitivity signals, and multi-carrier uplink signals.

When only one upwave signal is present in the upwave signal group, the upwave signal group is the same as the first embodiment, and the description thereof is omitted here.

The uplink signal group comprises two and more uplink signals with the same transmission path, the uplink signal with the minimum influence of crosstalk cost in the uplink signal group is used as a low crosstalk sensitivity signal, a crosstalk area of the matching frequency spectrum resource is allocated to the low crosstalk sensitivity signal in the uplink signal group, and a non-crosstalk area of the matching frequency offset resource is allocated to other uplink signals in the uplink signal group, wherein two specific situations exist:

in the first case, when the up-wave signal includes two up-wave signals with the same transmission path, one up-wave signal with the least influence of crosstalk cost in the up-wave signal group is taken as a low crosstalk sensitivity signal:

As can be seen from the description of the simulation results in the embodiments, in FBON, the crosstalk penalty due to the residual spectral components of the low crosstalk sensitivity signal is small, but for the high-order modulation or multi-carrier add signal, the crosstalk penalty due to ROADM is large and is not negligible. Therefore, in order to reduce the influence of crosstalk costs on the up-wave signals, the regions of the matching spectral resources immediately adjacent to the through-signals are assigned to the low crosstalk sensitivity signals, that is, the crosstalk regions are assigned to the low crosstalk sensitivity signals. The other up-wave signal of the up-wave signal group may be any one of a low crosstalk sensitivity signal, a high crosstalk sensitivity signal which is influenced by crosstalk cost more than the low crosstalk sensitivity signal, or a multi-carrier up-wave signal, and a region in the matching spectrum resource which is immediately adjacent to the low crosstalk sensitivity signal is allocated to the other up-wave signal. The cross-talk region due to residual spectral components is small, typically 1 minimum granularity of change, i.e., 12.5 GHz. A low crosstalk sensitivity signal may completely cover the crosstalk area of the residual spectral components. Thus, the other up signal is immediately adjacent to the low crosstalk sensitivity signal, i.e. in the non-crosstalk zone.

As shown in fig. 12(a), the fourth upwave signal group is allocated with matching spectrum resources, the upwave signal 9 is located close to the side of the through signal 7 where the filtering bandwidth is reduced, and the dual carrier upwave signal 10 is located close to the upwave signal 9. As can be seen from the figure, the crosstalking zones are assigned to the low crosstalk sensitivity signals 9 and the non-crosstalking zones are assigned to the high crosstalk sensitivity signals 10.

In the second case: when the up-wave signal group comprises more than two up-wave signals with the same transmission path, taking the two up-wave signals with the minimum influence of crosstalk cost in the up-wave signal group as low crosstalk sensitivity signals:

sorting the upper wave signals in the upper wave signal group, arranging two upper wave signals which are influenced the least by crosstalk cost as low crosstalk sensitivity signals at two ends, and arranging other upper wave signals in the middle;

In FBON, the low crosstalk sensitivity signal is less affected by the crosstalk penalty due to the residual spectral components, but for higher order modulation or multi-carrier add signals, the crosstalk penalty due to ROADM is significant and not negligible. And sequencing the upper wave signals in the upper wave signal group, respectively arranging two low crosstalk sensitivity signals at two ends, and arranging other upper wave signals in the middle, so that when the matching frequency spectrum resources are distributed to the upper wave signal group, any through signal adjacent to the matching frequency spectrum resources is adjacent. Two low crosstalk sensitivity signals in the up wave signal group serve as barriers for protecting other up wave signals.

As shown in fig. 12(b), the matching spectrum resources are allocated to the third upwave signal group, the three upwave signals in the third upwave signal group are sorted, the lower order upwave signal 6 and the upwave signal 8 are arranged on both sides, the higher order upwave signal 7 is arranged in the middle, and the matching spectrum resources are allocated to the third upwave signal group after arrangement. As can be seen from the figure, the lower order up-wave signal 6 is located at one side of the through-signal 6 where the filtering bandwidth is reduced, i.e. in the crosstalk area, the higher order up-wave signal 7 is located in the non-crosstalk area, and the lower order up-wave signal 8 is located in the crosstalk area, next to the edge of the through-signal 3. The lower order up-signals 6 and 8 act as barriers to the high crosstalk sensitivity signal 7, and the up-signals 7 are distributed to non-crosstalk areas matching the spectral resources without being affected by residual spectral components.

Optionally, the other up-wave signals are sequentially arranged from the middle to two sides according to the modulation order from high to low.

When the upper wave signals in the upper wave signal group are sequenced, if the number of the upper wave signals in the upper wave signal group is large, two low crosstalk sensitivity signals are randomly selected to be respectively arranged at two ends, and other upper wave signals are sequentially arranged from the middle to two sides according to the sequence of the modulation orders from high to low.

For example, it is assumed that the other uplink signals include five uplink signals, the modulation orders of the five uplink signals are 32QAM, 16QAM, 8QAM, and 8QAM, the uplink signal with the modulation order of 32QAM is placed at the middle, one uplink signal with the modulation order of 16QAM is placed at each of two sides of the uplink signal with 32QAM, and two uplink signals with the modulation order of 8QAM are respectively arranged at two ends.

EXAMPLE III

Fig. 13 is a flowchart of an embodiment of a method for reducing crosstalk cost according to the present invention, which is compared with the first embodiment and the second embodiment, and the third embodiment does not need to reduce the filtering bandwidth of the through signal, where the method includes:

step 1301: and allocating transmission paths to an upwave signal group, wherein the upwave signal group comprises at least two upwave signals with the same transmission paths, and the upwave signal with the minimum influence of crosstalk cost in the upwave signal group is used as a low crosstalk sensitivity signal.

When the ROADM system at least comprises two up-wave signals, the up-wave signals with the same transmission path are used as one up-wave signal group, and each up-wave signal group at least comprises two up-wave signals with the same transmission path.

Grouping of the plurality of add signals is illustrated, assuming that there are 5 add signals in the ROADM system: the uplink signal 11 (40 GPDM-QPSK), the uplink signal 12 (dual carrier 400GPDM-16 QAM), the uplink signal 13 (100 GPDM-QPSK), the uplink signal 14 (dual carrier 400GPDM-16 QAM), and the uplink signal 15 (40 GPDM-QPSK), wherein the transmission paths of the uplink signal 11 and the uplink signal 12 are the same, and the transmission paths of the uplink signal 13, the uplink signal 14, and the uplink signal 15 are the same. The up-wave signal 11 and the up-wave signal 12 are divided into a fifth up-wave signal group, and the up-wave signal 13, the up-wave signal 14, and the up-wave signal 15 are divided into a sixth up-wave signal group. Distributing a transmission path for each of the fifth and sixth upgoing wave signal groups, that is, distributing a piece of routing information for each upgoing wave signal in the fifth and sixth upgoing wave signal groups, wherein the routing information distributed for two upgoing wave signals in the fifth upgoing wave signal group is the same; and the three upper wave signals in the sixth upper wave signal group are distributed with the same routing information.

In the embodiment of the present invention, a Path Computation Element (PCE) is used to allocate a transmission path for an uplink signal packet, and generally, the shortest transmission path is preferentially selected.

Step 1302: and selecting a matched spectrum resource on the transmission path, wherein the matched spectrum resource is continuous and has a spectrum width larger than the sum of the spectrum widths of all the upgoing signals in the upgoing signal group.

After the transmission path is selected, there are multiple downlink signals on the transmission path, and each downlink signal will obtain one idle spectrum resource, as shown in fig. 14, a matching spectrum resource is selected from multiple idle spectrum resources for each uplink signal group, and the selected idle spectrum resource is allocated to the uplink signal. The matching spectrum resource is a continuous section of spectrum resource, and the spectrum width of the spectrum resource is larger than the sum of the spectrum widths of all the upgoing signals in the upgoing signal group.

The up-wave signals 11 and 12 are divided into a fifth up-wave signal group, a continuous idle spectrum resource 9 is allocated to the fifth up-wave signal group, the spectrum width of the idle spectrum resource 9 is larger than the sum of the spectrum widths of the two up-wave signals 11 and 12, and the idle spectrum resource 9 is used as a matching spectrum resource. The up-wave signal 13, the up-wave signal 14 and the up-wave signal 15 are divided into a sixth up-wave signal group, a continuous free spectrum resource 8 is allocated to the sixth up-wave signal group, and the spectrum width of the free spectrum resource 8 is larger than the sum of the spectrum widths of the three up-wave signals of the up-wave signal 13, the up-wave signal 14 and the up-wave signal 15.

Step 1303: and distributing the crosstalk areas of the matched spectrum resources to the low crosstalk sensitivity signals in the uplink signal group, and distributing the non-crosstalk areas of the matched spectrum resources to other uplink signals in the uplink signal group.

Wherein the other uplink signals include any one or more of a low crosstalk sensitivity signal, a high crosstalk sensitivity signal that is more affected by crosstalk cost than the low crosstalk sensitivity signal, and a multi-carrier uplink signal.

The up-wave signal group comprises two and more up-wave signals with the same transmission path, the up-wave signal with the minimum influence of crosstalk cost in the up-wave signal group is used as a low crosstalk sensitivity signal, a crosstalk area of the matched spectrum resource is distributed to the low crosstalk sensitivity signal in the up-wave signal group, and a non-crosstalk area of the matched spectrum resource is distributed to other up-wave signals in the up-wave signal group, wherein two specific conditions are as follows:

As can be seen from the description of the simulation results in the embodiments, in FBON, the crosstalk penalty due to the residual spectral components of the low crosstalk sensitivity signal is small, but for the high-order modulation or multi-carrier add signal, the crosstalk penalty due to ROADM is large and is not negligible. Therefore, in order to reduce the influence of crosstalk costs on the up-wave signal, a region of the matching spectral resources immediately adjacent to the through-signal is assigned to the low crosstalk sensitivity signal such that the low crosstalk sensitivity signal is immediately adjacent to the through-signal, that is, the low crosstalk sensitivity signal is located in a crosstalk region. The other up-wave signal of the up-wave signal group may be any one of a low crosstalk sensitivity signal, a high crosstalk sensitivity signal which is influenced by crosstalk cost more than the low crosstalk sensitivity signal, or a multi-carrier up-wave signal, and a region in the matching spectrum resource which is immediately adjacent to the low crosstalk sensitivity signal is allocated to the other up-wave signal. The cross-talk region due to residual spectral components is small, typically 1 minimum granularity of change, i.e., 12.5 GHz. A low crosstalk sensitivity signal may completely cover the crosstalk area of the residual spectral components. Therefore, the other up-wave signal can be in the non-crosstalk area as long as it is close to the low crosstalk sensitivity signal.

As shown in fig. 15(a), the matching spectrum resource 9 is allocated to the fifth group of the up-wave signals, the up-wave signal 11 is immediately adjacent to the through-signal 11, and the up-wave signal 12 is immediately adjacent to the up-wave signal 11. As can be seen from the figure, the low crosstalk sensitivity signal 11 is located in the crosstalk zone with residual spectral components, and the high crosstalk sensitivity signal 12 is located in the non-crosstalk zone.

Alternatively, as shown in fig. 15(b), the matching spectrum resource 9 is allocated to the fifth group of the up-wave signals, the up-wave signal 11 is immediately adjacent to the through-signal 12, and the up-wave signal 12 is immediately adjacent to the up-wave signal 11. As can be seen from the figure, the low crosstalk sensitivity signal 11 is located in the crosstalk zone with residual spectral components, and the high crosstalk sensitivity signal 12 is located in the non-crosstalk zone.

In the second case: when the up-wave signal group comprises more than two up-wave signals with the same transmission path, and two up-wave signals with the smallest influence of crosstalk cost in the up-wave signal group are used as low crosstalk sensitivity signals:

As shown in fig. 15(c), the matching spectrum resources 8 are allocated to the third group of upgoing wave signals, the three upgoing wave signals in the sixth group of upgoing wave signals are sorted, the upgoing wave signals 13 and the upgoing wave signals 14 of lower order are arranged on both sides, the high crosstalk sensitivity signals 18 are arranged in the middle, and the matching spectrum resources 8 are allocated to the sixth arranged group of upgoing wave signals. As can be seen from the figure, the lower order up-wave signal 13 is adjacent to the through-signal 10, i.e. the up-wave signal 13 is located in the crosstalk area, the higher order up-wave signal 14 is located in the non-crosstalk area, and the lower order up-wave signal 15 is adjacent to the higher order up-wave signal 14. The lower order up-wave signal 13 and the up-wave signal 15 correspond to a barrier of the high crosstalk sensitivity signal 14, and the higher order up-wave signal 14 is located in the non-crosstalk region without being affected by the residual spectral components. Of course, the positions of the upper wave signal 13 and the upper wave signal 15 of the lower order may be interchanged.

For example, it is assumed that the other uplink signals include five uplink signals, the modulation orders of the five uplink signals are 32QAM, 16QAM, 8QAM, and 8QAM, the uplink signal with the modulation order of 32QAM is placed at the middle, one uplink signal with the modulation order of 16QAM is placed at each of two sides of the uplink signal with 32QAM, and two uplink signals with the modulation order of 8QAM are respectively arranged at two ends. Of course, the positions of the upper wave signals at the same modulation order level may be interchanged, and in the above description, the positions of two upper wave signals with a modulation order of 16QAM may be interchanged, and the positions of two upper wave signals with a modulation order of 8QAM may be interchanged.

Example four

Fig. 16 is a schematic structural diagram of a fourth embodiment of an apparatus for reducing crosstalk cost according to the present invention, where the fourth embodiment is an apparatus corresponding to the method in the first embodiment, and the apparatus includes:

the first path allocating module 1601 is configured to allocate transmission paths to groups of upgoing wave signals, where each group of upgoing wave signals includes at least one upgoing wave signal with the same transmission path.

A first resource selecting module 1602, configured to select a matching spectrum resource on the transmission path, where the matching spectrum resource is continuous and has a spectrum width greater than a sum of spectrum widths of all the upgoing signals in the upgoing signal group.

A bandwidth reduction module 1603 for reducing a filtering bandwidth of at least one through signal adjacent to the matched spectral resource.

A first spectrum allocation module 1604, configured to allocate the matched spectrum resource to the up-wave signal group, so that the up-wave signal group is immediately adjacent to the through signal with reduced filtering bandwidth.

EXAMPLE five

Fig. 17 is a schematic structural diagram of a fifth embodiment of an apparatus for reducing crosstalk cost according to the present invention, where the fifth embodiment is an apparatus corresponding to the method in the second embodiment, and the apparatus includes:

a first grouping module 1701 for grouping each of the up-wave signals into a group of up-wave signals; or, the up-wave signals are divided into one up-wave signal group.

The first resource selecting module 1602 includes:

a searching unit 1702, configured to search for a through signal on the transmission path, which is the same as the transmission path of the up-wave signal group;

a selecting unit 1703 is configured to select a matching spectrum resource adjacent to the through signal.

The bandwidth reduction module 1603 includes:

a narrowing unit 1704 is configured to narrow a filter bandwidth of the through signal that is the same as the transmission path of the up-wave signal group.

When the up-wave signal group includes two or more up-wave signals with the same transmission path, the up-wave signal with the smallest influence of crosstalk cost in the up-wave signal group is used as a low crosstalk sensitivity signal, and the first spectrum allocation module 1604 includes:

a first allocating unit 1705, configured to allocate a crosstalk area of the matching frequency spectrum resource to a low crosstalk sensitivity signal in the uplink signal group, and allocate a non-crosstalk area of the matching frequency offset resource to another uplink signal in the uplink signal group.

Optionally, when the uplink signals include two uplink signals with the same transmission path, one of the uplink signals in the uplink signal group that is least affected by crosstalk cost is taken as a low crosstalk sensitivity signal, where the first allocating unit 1705 includes:

Optionally, the uplink signal group includes more than two uplink signals with the same transmission path, and two uplink signals with the smallest influence of crosstalk cost in the uplink signal group are used as low crosstalk sensitivity signals, where the first allocating unit 1705 includes:

EXAMPLE six

Fig. 18 is a schematic structural diagram of a sixth embodiment of an apparatus for reducing crosstalk cost according to the present invention, where the sixth embodiment is an apparatus corresponding to the method in the third embodiment, and the apparatus includes:

the second path allocating module 1801 is configured to allocate transmission paths to the uplink signal groups, where each uplink signal group includes at least two uplink signals with the same transmission path, and an uplink signal in the uplink signal group that is least affected by crosstalk cost is used as a low crosstalk sensitivity signal.

A second resource selecting module 1802, configured to select a matching spectrum resource on the transmission path, where the matching spectrum resource is continuous and has a spectrum width greater than a sum of spectrum widths of all the uplink signals in the uplink signal group.

Optionally, the up-wave signals include two up-wave signals with the same transmission path, and one up-wave signal with the smallest influence of crosstalk cost in the up-wave signal group is used as a low crosstalk sensitivity signal, and the second spectrum allocation module 1802 includes:

Optionally, the uplink signal group includes more than two uplink signals with the same transmission path, and two uplink signals with the smallest influence of crosstalk cost in the uplink signal group are used as low crosstalk sensitivity signals, where the second spectrum allocation module 1802 includes:

A second spectrum allocating module 1803, configured to allocate crosstalk areas of the matching spectrum resources to low crosstalk sensitivity signals in the uplink signal group, and allocate non-crosstalk areas of the matching spectrum resources to other uplink signals in the uplink signal group.

Optionally, the apparatus further comprises:

the second grouping module is used for dividing each upwave signal into an upwave signal group; alternatively, the up-wave signals having the same transmission path are divided into one up-wave signal group.

EXAMPLE seven

Fig. 19 is a schematic structural diagram of a seventh embodiment of an apparatus for reducing crosstalk cost according to the present invention, where the apparatus includes a first memory 1901 and a first processor 1902, where the first memory 1901 is configured to store an instruction, and the first processor 1902 is configured to call the instruction, where the instruction includes:

the selecting a matching spectrum resource on the transmission path comprises:

selecting a matching spectrum resource adjacent to the through signal;

narrowing the filtering bandwidth of a through signal having the same transmission path as the up-wave signal group;

The up-wave signal group comprises two and more up-wave signals with the same transmission path, the up-wave signal with the minimum influence of crosstalk cost in the up-wave signal group is used as a low crosstalk sensitivity signal, and the allocating the matched spectrum resource to the up-wave signal group comprises:

The uplink signals include two uplink signals with the same transmission path, one uplink signal with the smallest influence of crosstalk cost in the uplink signal group is used as a low crosstalk sensitivity signal, the allocating the crosstalk area of the matching frequency spectrum resource to the low crosstalk sensitivity signal in the uplink signal group, and the allocating the non-crosstalk area of the matching frequency offset resource to other uplink signals in the uplink signal group includes:

The uplink signal group includes more than two uplink signals with the same transmission path, the two uplink signals with the minimum influence of crosstalk cost in the uplink signal group are used as low crosstalk sensitivity signals, the distributing the crosstalk area of the matching frequency spectrum resource to the low crosstalk sensitivity signals in the uplink signal group, and the distributing the non-crosstalk area of the matching frequency offset resource to other uplink signals in the uplink signal group includes:

The arranging of the other up-wave signals in the middle includes:

Said reducing a filtering bandwidth of at least one pass signal adjacent to said matched spectrum resource comprises:

Before distributing transmission paths to the upwave signal group, the method further comprises the following steps:

dividing each upwave signal into an upwave signal group;

or,

Example eight

Fig. 20 is a schematic structural diagram of a seventh embodiment of an apparatus for reducing crosstalk penalty according to the present invention, where the apparatus includes a first memory 2001 and a first processor 2002, where the first memory 2001 is used to store an instruction, and the first processor 2002 is used to call the instruction, where the instruction includes:

The up-wave signals include two up-wave signals with the same transmission path, one up-wave signal with the smallest influence of crosstalk cost in the up-wave signal group is used as a low crosstalk sensitivity signal, the allocating the crosstalk area of the matched spectrum resource to the low crosstalk sensitivity signal in the up-wave signal group, and the allocating the non-crosstalk area of the matched spectrum resource to other up-wave signals in the up-wave signal group includes:

Optionally, before allocating a transmission path to the upper wave signal group, the method further executes an instruction:

dividing each upwave signal into an upwave signal group; alternatively, the up-wave signals having the same transmission path are divided into one up-wave signal group.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for reducing crosstalk costs, the method comprising:

2. The method of claim 1, wherein selecting a matching spectrum resource on the transmission path comprises:

selecting a matching spectrum resource adjacent to the through signal;

3. The method of claim 1, wherein the set of upgoing signals includes two or more upgoing signals with the same transmission path, and the upgoing signals with the least influence of crosstalk cost in the set of upgoing signals are used as low crosstalk sensitivity signals, and the allocating the matched spectrum resources to the set of upgoing signals includes:

4. The method of claim 3, wherein the upstream signals include two upstream signals with the same transmission path, one of the upstream signal groups with the least influence of crosstalk cost is taken as a low crosstalk sensitivity signal, the allocating the crosstalk area of the matching spectrum resource to the low crosstalk sensitivity signal of the upstream signal group, and the allocating the non-crosstalk area of the matching frequency offset resource to the other upstream signals of the upstream signal group includes:

5. The method of claim 3, wherein the set of upgoing signals includes more than two upgoing signals with the same transmission path, and two upgoing signals with the least influence of crosstalk cost in the set of upgoing signals are used as low crosstalk sensitivity signals, the allocating the crosstalk area of the matching spectrum resource to the low crosstalk sensitivity signals in the set of upgoing signals, and the allocating the non-crosstalk area of the matching frequency offset resource to other upgoing signals in the set of upgoing signals includes:

6. The method of claim 5, wherein said arranging the other up-wave signals in the middle comprises:

7. The method according to any of claims 1-6, wherein the narrowing the filtering bandwidth of at least one through signal adjacent to the matched spectrum resource comprises:

8. The method of any of claims 1-6, wherein prior to assigning transmission paths to groups of upgoing signals, further comprising:

dividing each upwave signal into an upwave signal group;

or,

9. A method for reducing crosstalk costs, the method comprising:

10. The method of claim 9, wherein the upstream signals include two upstream signals with the same transmission path, one of the upstream signal groups with the least influence of crosstalk cost is taken as a low crosstalk sensitivity signal, the allocating the crosstalk area of the matched spectrum resource to the low crosstalk sensitivity signal of the upstream signal group, and the allocating the non-crosstalk area of the matched spectrum resource to the other upstream signals of the upstream signal group includes:

11. The method of claim 9, wherein the set of upgoing signals includes more than two upgoing signals with the same transmission path, and two upgoing signals with the least influence of crosstalk cost in the set of upgoing signals are used as low crosstalk sensitivity signals, the allocating the crosstalk area of the matching spectrum resource to the low crosstalk sensitivity signals in the set of upgoing signals, and the allocating the non-crosstalk area of the matching frequency offset resource to other upgoing signals in the set of upgoing signals includes:

12. The method of any of claims 9-11, wherein prior to assigning transmission paths to groups of upgoing signals, further comprising:

dividing each upwave signal into an upwave signal group;

or,

13. An apparatus for reducing crosstalk costs, the apparatus comprising:

14. The apparatus of claim 13, wherein the first resource selection module comprises:

the bandwidth reduction module comprises:

15. The apparatus of claim 13, wherein the up-wave signal group includes two or more up-wave signals with the same transmission path, and the up-wave signal with the least influence of crosstalk cost in the up-wave signal group is used as the low crosstalk sensitivity signal, and the first spectrum allocation module includes:

16. The apparatus of claim 15, wherein the up-wave signals include two up-wave signals with the same transmission path, and one of the up-wave signals in the up-wave signal group with the least influence of crosstalk cost is used as the low crosstalk sensitivity signal, and the first distributing unit includes:

17. The apparatus of claim 15, wherein the group of upgoing signals includes more than two upgoing signals with the same transmission path, and two upgoing signals with least influence of crosstalk cost in the group of upgoing signals are used as the low crosstalk sensitivity signals, and the first distributing unit includes:

18. The apparatus of any one of claims 13-17, further comprising:

or,

19. An apparatus for reducing crosstalk costs, the apparatus comprising:

20. The apparatus of claim 19, wherein the up-wave signals include two up-wave signals with the same transmission path, and one of the up-wave signals in the up-wave signal group with the least influence of crosstalk cost is taken as a low crosstalk sensitivity signal, and the second spectrum allocation module includes:

21. The apparatus of claim 19, wherein the up-wave signal group includes more than two up-wave signals with the same transmission path, and two up-wave signals with least influence of crosstalk cost in the up-wave signal group are used as low crosstalk sensitivity signals, and the second spectrum allocation module includes:

22. The apparatus of any one of claims 19-21, further comprising:

or,