CN115514442A - Wavelength division link protection system and method - Google Patents
Wavelength division link protection system and method Download PDFInfo
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- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0272—Transmission of OAMP information
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Abstract
One aspect of the present disclosure relates to wavelength division link protection systems and methods. The wavelength division link protection system includes: a main link and a standby link; the first tunable optical module is positioned at one end of the optical fiber link; and a second tunable optical module at the other end of the optical fiber link, the first tunable optical module configured to: transmitting an optical signal of a first wavelength and receiving an optical signal of a third wavelength from a second tunable optical module, and switching to transmit an optical signal of a second wavelength when the received optical signal indicates that the active link is abnormal, the second tunable optical module being configured to: and transmitting an optical signal of a third wavelength and receiving an optical signal of the first wavelength from the first tunable optical module, and switching to transmit an optical signal of a fourth wavelength when the received optical signal indicates that the active link is abnormal, wherein the optical signal of the first wavelength and the optical signal of the third wavelength are guided to the active link, and the optical signal of the second wavelength and the optical signal of the fourth wavelength are guided to the standby link.
Description
Technical Field
The present disclosure relates to the field of optical communications, and in particular, to the field of Wavelength Division Multiplexing (WDM) technology.
Background
Wavelength division multiplexing is a technique of coupling a plurality of optical signals with different wavelengths into the same optical fiber through a multiplexer, thereby performing data transmission. The application of the technology can save a great deal of optical fiber resources. To cope with the risk of interruption of the optical fiber line, the optical line is generally protected. For example, protection can be performed by automatically switching the working line to the protection line when a fault occurs.
Existing optical line protection technologies include semi-active schemes and active schemes. Among them, the active scheme may employ pairs of optical switches for line switching. However, as an active device, maintenance of the optical switch requires high cost. Since this solution requires maintenance of the active optical switching devices at both ends, the maintenance cost is very high. The semi-active scheme employs an optical splitter and an optical switch, and signals are split into two lines by the optical splitter and switched by the optical switch. The optical splitter is a passive device. However, the splitter will introduce higher line insertion loss, resulting in optical inefficiency. Furthermore, there is still a need to maintain the active optical switching devices at one end, so that the maintenance costs, although reduced compared to the active solutions, are still at a distance from the ideal maintenance costs.
Therefore, there is a need for a wavelength division link protection system and method that is low maintenance and light efficient.
Disclosure of Invention
The following presents a simplified summary of the disclosure in order to provide a basic understanding of some aspects of the disclosure. However, it should be understood that this summary is not an exhaustive overview of the disclosure. It is not intended to identify key or critical elements of the disclosure or to delineate the scope of the disclosure. Its sole purpose is to present some concepts of the disclosure in a simplified form as a prelude to the more detailed description that is presented later.
In order to overcome the drawbacks of the prior art, the present disclosure provides a wavelength division link protection system and method based on a tunable optical module. In the system disclosed by the invention, the tunable optical module is configured to monitor the optical signal passing through the line and adjust the working wavelength of the service signal to realize the automatic switching of the working link, so that the protection of the wavelength division link is realized, the use of an optical splitter and an optical switch is eliminated, and the problems of large insertion loss and the need of maintaining active equipment in the conventional wavelength division link protection scheme are solved.
According to one aspect of the present disclosure, a wavelength division link protection system is disclosed, the system comprising: the optical fiber link comprises a main link and a standby link; the first tunable optical module is positioned at one end of the optical fiber link; and a second tunable optical module located at the other end of the optical fiber link, wherein the first tunable optical module is configured to: transmitting an optical signal at a first wavelength and receiving an optical signal at a third wavelength from a second tunable optical module, and switching to transmit an optical signal at a second wavelength when the received optical signal indicates that the primary link is abnormal, and wherein the second tunable optical module is configured to: and transmitting an optical signal with a third wavelength, receiving an optical signal with the first wavelength from the first tunable optical module, and switching to transmit an optical signal with a fourth wavelength when the received optical signal indicates that the main link is abnormal, wherein the optical signal with the first wavelength and the optical signal with the third wavelength are guided to the main link and transmitted through the main link, and the optical signal with the second wavelength and the optical signal with the fourth wavelength are guided to the standby link and transmitted through the standby link.
In accordance with another aspect of the present disclosure, a wavelength division link protection method is disclosed, the method comprising: setting an optical fiber link, wherein the optical fiber link comprises a main link and a standby link; arranging a first tunable optical module at one end of an optical fiber link; a second tunable optical module is arranged at the other end of the optical fiber link; configuring a first tunable optical module to: transmitting an optical signal with a first wavelength, receiving an optical signal with a third wavelength from a second tunable optical module, and switching to transmit an optical signal with a second wavelength when the received optical signal indicates that the main link is abnormal; and configuring a second tunable optical module to: and transmitting an optical signal with a third wavelength, receiving an optical signal with the first wavelength from the first tunable optical module, and switching to transmit an optical signal with a fourth wavelength when the received optical signal indicates that the main link is abnormal, wherein the optical signal with the first wavelength and the optical signal with the third wavelength are guided to the main link and transmitted through the main link, and the optical signal with the second wavelength and the optical signal with the fourth wavelength are guided to the standby link and transmitted through the standby link.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:
fig. 1 shows a schematic diagram of a wavelength division link protection system according to one embodiment of the present disclosure;
fig. 2 shows a schematic diagram of a wavelength division link protection system according to another embodiment of the present disclosure;
fig. 3 shows a schematic diagram of an optical signal transmission line in a wavelength division link protection system according to one embodiment of the present disclosure; and
fig. 4 shows a flow diagram of a wavelength division link protection method according to one embodiment of the present disclosure.
Detailed Description
The following detailed description is made with reference to the accompanying drawings and is provided to assist in a comprehensive understanding of various exemplary embodiments of the disclosure. The following description includes various details to aid understanding, but these details are to be regarded as examples only and are not intended to limit the disclosure, which is defined by the appended claims and their equivalents. The words and phrases used in the following description are used only to provide a clear and consistent understanding of the disclosure. In addition, descriptions of well-known structures, functions, and configurations may be omitted for clarity and conciseness. Those of ordinary skill in the art will recognize that various changes and modifications of the examples described herein can be made without departing from the spirit and scope of the disclosure.
The wavelength division link protection system and method based on the tunable optical module, which are provided by the disclosure, use the tunable optical module to replace a fixed wavelength optical module used in the prior art, and can automatically switch a working line to a protection line for protection when a fault occurs without an optical splitter and an optical switch. The tunable optical module refers to an optical module whose wavelength can be changed during operation. In the related art, a wavelength division multiplexing optical communication system generally uses an optical module having a fixed wavelength. Once the optical module with fixed wavelength is installed and debugged, it enters the use stage, and its wavelength is unchangeable. A wavelength division link protection system according to one embodiment of the present disclosure is described below with reference to fig. 1.
As shown in fig. 1, the wavelength division link protection system includes an optical fiber link for transmitting optical signals. As is known to those skilled in the art, the optical fibers employed in wavelength division links can carry optical signals of a plurality of different wavelengths in both directions.
The fiber link is composed of an active link 101 and a standby link 102. Each of the active link and the standby link may be capable of bi-directionally transmitting a plurality of optical signals at different wavelengths.
Wavelength division link protection system also includes first tunable optical module 103 and second tunable optical module 104. First tunable optical module 103 is located at one end of the optical fiber link and second tunable optical module 104 is located at the other end of the optical fiber link.
The first tunable optical module 103 is configured to: and transmitting an optical signal lambda 11 of the first wavelength, receiving an optical signal lambda 13 of the third wavelength from the second tunable optical module, and switching to transmit an optical signal lambda 12 of the second wavelength when the received optical signal lambda 13 indicates that the primary link is abnormal.
Second tunable optical module 104 is configured to: and transmitting an optical signal lambda 13 of a third wavelength, receiving an optical signal lambda 11 of the first wavelength from the first tunable optical module, and switching to transmit an optical signal lambda 14 of a fourth wavelength when the received optical signal lambda 11 indicates that the primary link is abnormal.
The optical signal λ 11 of the first wavelength and the optical signal λ 13 of the third wavelength are guided to and transmitted through the active link, and the optical signal λ 12 of the second wavelength and the optical signal λ 14 of the fourth wavelength are guided to and transmitted through the backup link.
In fig. 1, the optical paths of the optical signals λ 11 and λ 12 are shown by thin solid lines, while the optical paths of the optical signals λ 13 and λ 14 are shown by broken lines, and the arrows indicate the transmission directions of the optical signals.
Where the terms "first wavelength", "second wavelength", "third wavelength" and "fourth wavelength" are used to distinguish between the different wavelengths.
In the above embodiment, the first tunable optical module 103 and the second tunable optical module 104 first use the active link to transmit the optical signal λ 11 of the first wavelength and the optical signal λ 13 of the third wavelength, respectively. Both wavelengths of signals are directed to the active link. After receiving the signal transmitted by the opposite end, first tunable optical module 103 and second tunable optical module 104 may determine whether the main link is abnormal based on the received signal, and if the main link is abnormal, switch the transmitted optical signal to λ 12 or λ 14. The optical signals λ 12 and λ 14 are directed to the backup link, thus effecting switching of the traffic signal link.
Since the tunable optical module itself already implements the functions of detecting faults and switching lines, an optical switch and an optical splitter are not required to be used. Compared with the prior art, the wavelength division link protection is realized by adopting the tunable optical module, so that the problems of large insertion loss and maintenance of active equipment are solved.
Those skilled in the art can implement the tunable optical module in an appropriate manner according to actual needs. According to one embodiment, the tunable optical module may be implemented by using a fixed wavelength optical module supporting a semiconductor Cooler (TEC), and the TEC adjusts the operating temperature of the transmitter to change the transmission wavelength.
According to one embodiment, tunable optical modules 103 and 104 may be configured to detect optical power of a received optical signal and determine whether an active link is abnormal based on the optical power.
The main link is abnormal, and the main link can be roughly divided into two types: the main link is interrupted and the signal quality of the main link is poor. In the case that the main link is interrupted, an optical signal cannot be transmitted from one end of the optical fiber link to the other end, and at this time, both the first tunable optical module 103 and the second tunable optical module 104 cannot receive an optical signal transmitted by the peer optical module, so that the optical power received by each of them is 0. In the case of poor signal quality, although the optical power is not 0, the optical power is still lower than the optical power threshold value during normal operation. The threshold value may be preset according to specific situations.
Thus, according to one embodiment, first and second tunable optical modules 103 and 104 are further configured to: the optical power of the received optical signal is detected and the wavelength of the transmitted optical signal is switched when the detected optical power is below a threshold value.
The case where the optical power is lower than the threshold includes a case where the optical power is 0.
In the above embodiment, the optical modules at both ends of the optical fiber link respectively perform fault detection and line switching, which may have a time difference in practice. This time difference causes a certain risk of bidirectional switching of the line. For example, in a case where one end performs wavelength switching before the other end, it may cause the other end to resume receiving the optical signal, so that wavelength switching is not performed. In the embodiments described below, this problem will be solved.
According to one embodiment, first tunable optical module 103 and second tunable optical module 104 are further configured to: the optical power of the received optical signal is detected, and the wavelength of the transmitted optical signal is switched when the detected optical power is below a threshold value, and a specific optical signal is inserted in the switched optical signal. And first and second tunable optical modules 103 and 104 are further configured to: the wavelength of the transmitted optical signal is switched based on the receipt of the particular optical signal.
The specific optical signal may be an optical signal having a specific characteristic that can be recognized by the tunable optical module. For example, the specific optical signal may be a specific pattern signal, i.e. a signal having a specific pulse form.
By inserting a specific optical signal while switching wavelengths, it is possible to ensure that the opposite end is triggered to perform wavelength switching, thereby avoiding the above-mentioned problems.
Furthermore, the specific light signal can also be triggered manually, which is particularly advantageous in connection with servicing. For example, when a worker needs to repair the main link, the worker may manually trigger a specific optical signal to switch the line from the active link to the standby link. Even if the active link is in a normal working state at the moment, the service can be switched to the standby link.
Single-ended detection of the fiber optic line can also be achieved by using a specific optical signal. In one embodiment, only one of the first tunable optical module and the second tunable optical module detects whether the received optical signal indicates that the link is abnormal, switches to the wavelength of the transmitted optical signal, and inserts a specific optical signal into the switched optical signal. And another optical module switches lines based on receiving the specific optical signal. Thus, the function of switching the service signal link can be realized at lower cost.
The wavelength division link protection system may also switch back to the active link again when an abnormality occurs in the backup link, for example, when the signal quality is poor. At this time, the problem of the active link may be eliminated, and the signal transmission may be performed normally. Thus, the function of freely switching between the active link and the standby link can be realized. This embodiment is particularly advantageous for situations where the signal is unstable. When the signal of the link is poor, the link can be automatically switched to another link regardless of whether the active link or the standby link is currently transmitting the signal.
Next, a wavelength division link protection system according to another embodiment is described with reference to fig. 2.
In the wavelength division link protection system shown in fig. 2, the tunable optical module 1', the active link, and the standby link are the same as those shown in fig. 1. For the sake of brevity, these components will not be described in detail herein. The difference from fig. 1 is that the wavelength division link protection system of fig. 2 further includes a wavelength combining component and a wavelength division component for guiding optical signals of different wavelengths from the tunable optical module to the active link or the standby link. The wave combining component and the wave splitting component are described in detail below.
The first wavelength-splitting component is located between the first tunable optical module 1 and the optical fiber link and is configured to guide an optical signal λ 11 of the first wavelength to the active link and an optical signal λ 12 of the second wavelength to the standby link. According to one embodiment, the first demultiplexing component may be a demultiplexer, and is therefore shown in fig. 2 as "demultiplexer 1".
The first wave-combining component is located between the first tunable optical module 1 and the optical fiber link and is configured to guide an optical signal λ 13 of the third wavelength from the primary link and an optical signal λ 14 of the fourth wavelength from the backup link to the first tunable optical module. According to one embodiment, the first multiplexing component may be a multiplexer, and thus is shown as "multiplexer 1" in fig. 2.
The second wavelength-splitting component is located between the second tunable optical module 1' and the optical fiber link and is configured to direct an optical signal λ 13 of a third wavelength to the primary link and an optical signal λ 14 of a fourth wavelength to the backup link. According to one embodiment, the second demultiplexing component may be a demultiplexer and is therefore shown in fig. 2 as "demultiplexer 1'".
The second multiplexer component is located between the second tunable optical module 1 'and the optical fiber link and is configured to guide the optical signal λ 11 of the first wavelength from the primary link and the optical signal λ 12 of the second wavelength from the backup link to the second tunable optical module 1'. According to one embodiment, the second multiplexing component may be a multiplexer, and thus is shown as "multiplexer 1'" in fig. 2.
The wave combining component and the wave splitting component are passive components and have small insertion loss. Therefore, the optical components with different wavelengths are guided to the active link and the standby link by the wave combining component and the wave splitting component, and insertion loss is not introduced or equipment maintenance cost is not increased basically.
In practical applications, a scenario where one end transmits optical signals of multiple wavelengths simultaneously is common. In this case, a plurality of tunable modules and wavelength multiplexing/demultiplexing components may be provided at each end, respectively. Additional tunable modules and multiplexing/demultiplexing components are described below.
One or more further first tuneable optical modules are provided, denoted tuneable optical module 2 to tuneable optical module N in fig. 2. One or more further second tunable optical modules corresponding to said one or more further first tunable optical modules are provided, denoted tunable optical module 2 'to tunable optical module N' in fig. 2.
Each set of tunable optical modules N and N' operates in a manner similar to that of first tunable optical module 103 and second tunable optical module 104 of fig. 1.
In addition, a first combining and splitting wave component is also arranged. One end of which is connected to all the first tunable optical modules 1-N and the other end of which is connected to the active link, configured to multiplex optical signals from all the first tunable optical modules to the active link and demultiplex optical signals from the active link to the corresponding first tunable optical modules 1-N. The first multiplexing/demultiplexing component may be formed by a multiplexer and a demultiplexer, represented in fig. 2 as multiplexer/demultiplexer 1.
There is also provided a second add/drop component having one end connected to all of the first tunable optical modules 1 to N and the other end connected to the spare link, configured to multiplex optical signals from all of the first tunable optical modules to the spare link and demultiplex optical signals from the spare link to the corresponding first tunable optical modules. The first multiplexing and demultiplexing component may be formed by a multiplexer and a demultiplexer, represented in fig. 2 as multiplexer/demultiplexer 2.
And a third add/drop component, one end of which is connected to all the second tunable optical modules 1'-N' and the other end of which is connected to the active link, configured to multiplex optical signals from all the second tunable optical modules 1'-N' to the active link and demultiplex optical signals from the active link to corresponding second tunable optical modules. The first multiplexing and demultiplexing component may be formed by a multiplexer and a demultiplexer, denoted as multiplexer/demultiplexer 1' in fig. 2.
And a fourth wavelength division multiplexing/demultiplexing component, one end of which is connected to all the second tunable optical modules 1'-N' and the other end of which is connected to the spare link, configured to multiplex the optical signals from all the second tunable optical modules 1'-N' to the spare link and demultiplex the optical signals from the spare link to the corresponding second tunable optical modules. The fourth multiplexing and demultiplexing component may be formed by a multiplexer and demultiplexer, denoted as multiplexer/demultiplexer 2' in fig. 2.
In order to enable the wavelength division multiplexing component to distinguish light emitted by different tunable optical modules, the wavelength of the light signal emitted by each of all the first tunable optical modules and all the second tunable optical modules is different.
Next, an optical signal transmission route in a wavelength division link protection system according to an embodiment of the present disclosure is described with reference to fig. 3.
Four optical signal transmission lines are shown in fig. 3. Wherein the solid dark gray line represents the optical signal transmission route from the left side end to the right side end (hereinafter referred to as "forward direction") in the figure when the main link is operating normally. The solid light gray lines represent the optical signal transmission path from the right side end to the left side end (hereinafter referred to as "reverse direction") when the active link is operating normally. The dark grey dotted line represents the forward optical signal transmission route when the primary link is abnormal. The light gray dashed line indicates the reverse optical signal transmission line when the primary link is abnormal. In the following, these four routes are described separately:
the forward route when the main link works normally: the λ 11 optical signal sent by the tunable optical module 1 enters the multiplexer/demultiplexer 1 and the main link through the demultiplexer 1, and then reaches the receiving port of the tunable optical module 1' through the multiplexer/demultiplexer 1' and the multiplexer 1'.
The reverse route when the main link works normally: the λ 13 optical signal sent by the tunable optical module 1' enters the multiplexer/demultiplexer 1' and the main link through the demultiplexer 1', and then reaches the receiving port of the tunable optical module 1 through the multiplexer/demultiplexer 1 and the multiplexer 1.
The normal route when the active link is abnormal: the tunable optical module 1 detects that the received signal indicates abnormal, so as to trigger the tunable optical module to adjust the transmission wavelength to λ 12, and the λ 12 optical signal enters the multiplexer/demultiplexer 2 and the standby link after passing through the demultiplexer 1, and then reaches the receiving port of the tunable optical module 1' through the multiplexer/demultiplexer 2' and the multiplexer 1', so as to implement the switching of the forward service signal.
The reverse route when the active link is abnormal: the tunable optical module 1' detects that the received signal indicates abnormal, so as to trigger the tunable optical module to adjust the transmission wavelength to λ 14, and the λ 14 optical signal enters the multiplexer/demultiplexer 2' and the standby link after passing through the demultiplexer 1', and reaches the receiving port of the tunable optical module 1 through the multiplexer/demultiplexer 2 and the multiplexer 1, so as to implement the switching of the reverse service signal.
A wavelength division link protection method according to one embodiment of the present disclosure is described below with reference to fig. 4.
Fig. 4 shows a flow diagram of a wavelength division link protection method according to one embodiment of the present disclosure.
First, in step 401, a fiber link is set, where the fiber link includes a primary link and a backup link.
Next, in step 402, a first tunable optical module is disposed at one end of the optical fiber link. The process then proceeds to step 403 where a second tunable optical module is placed at the other end of the fiber link.
Then, proceeding to step 404, the first tunable optical module is configured to: and transmitting an optical signal with a first wavelength, receiving an optical signal with a third wavelength from the second tunable optical module, and switching to transmit an optical signal with a second wavelength when the received optical signal indicates that the main link is abnormal.
Thereafter, at step 405, the second tunable optical module is configured to: and transmitting an optical signal with a third wavelength, receiving an optical signal with the first wavelength from the first tunable optical module, and switching to transmit an optical signal with a fourth wavelength when the received optical signal indicates that the main link is abnormal.
Wherein the optical signal at the first wavelength and the optical signal at the third wavelength are directed to and transmitted through the active link, and the optical signal at the second wavelength and the optical signal at the fourth wavelength are directed to and transmitted through the backup link.
According to one embodiment, the first tunable optical module and the second tunable optical module are further configured to determine whether the active link is abnormal by detecting optical power of the received optical signal.
According to one embodiment, the first and second tunable optical modules are further configured to: the optical power of the received optical signal is detected and the wavelength of the emitted optical signal is switched when the detected optical power is below a threshold.
According to one embodiment, the first and second tunable optical modules are further configured to: detecting optical power of the received optical signal, and switching a wavelength of the transmitted optical signal when the detected optical power is lower than a threshold value, and inserting a specific optical signal in the switched optical signal; and further configuring the first and second tunable optical modules to: the wavelength of the transmitted optical signal is switched based on the receipt of the particular optical signal.
According to one embodiment, the wavelength division link protection method further comprises: arranging a first wavelength division component between the first tunable optical module and the optical fiber link, wherein the first wavelength division component is configured to guide an optical signal with a first wavelength to the main link and guide an optical signal with a second wavelength to the standby link; and arranging a first wave-combining component between the first tunable optical module and the optical fiber link, wherein the first wave-combining component is configured to guide the optical signal with the third wavelength from the main link and the optical signal with the fourth wavelength from the standby link to the first tunable optical module.
According to one embodiment, the wavelength division link protection method further comprises: a second wavelength division component is arranged between the second tunable optical module and the optical fiber link, and the second wavelength division component is configured to guide an optical signal with a third wavelength to the main link and guide an optical signal with a fourth wavelength to the standby link; and arranging a second multiplexing component between the second tunable optical module and the optical fiber link, wherein the second multiplexing component is configured to guide the optical signal with the first wavelength from the active link and the optical signal with the second wavelength from the standby link to the second tunable optical module.
According to one embodiment, the wavelength division link protection method further comprises: setting one or more first tunable optical modules; setting one or more first tunable optical modules corresponding to the first tunable optical modules; setting a first wavelength division multiplexing component, wherein the first wavelength division multiplexing component is configured to multiplex optical signals from all the first tunable optical modules to the main link and demultiplex optical signals from the main link to the corresponding first tunable optical modules; setting a second wavelength division multiplexing component, wherein the second wavelength division multiplexing component is configured to multiplex optical signals from all the first tunable optical modules to the standby link and demultiplex optical signals from the standby link to the corresponding first tunable optical modules; setting a third wavelength multiplexing/demultiplexing component configured to multiplex optical signals from all the second tunable optical modules to the main link and demultiplex optical signals from the main link to corresponding second tunable optical modules; and setting a fourth wavelength division multiplexing component, configured to multiplex optical signals from all the second tunable optical modules to the spare link and demultiplex optical signals from the spare link to corresponding second tunable optical modules, wherein the wavelength of the optical signals transmitted by each of all the first tunable optical modules and all the second tunable optical modules is different.
The subject matter of the present disclosure is provided as examples of apparatus, systems, methods, and programs for performing the features described in the present disclosure. However, other features or variations are contemplated in addition to the features described above. It is contemplated that the implementation of the components and functions of the present disclosure may be accomplished with any emerging technology that may replace the technology of any of the implementations described above.
Additionally, the above description provides examples, and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various embodiments may omit, substitute, or add various procedures or components as appropriate. For example, features described with respect to certain embodiments may be combined in other embodiments.
Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking and parallel processing may be advantageous.
Claims (16)
1. A wavelength division link protection system, the system comprising:
the optical fiber link comprises a main link and a standby link;
the first tunable optical module is positioned at one end of the optical fiber link; and
a second tunable optical module located at the other end of the optical fiber link,
wherein the first tunable optical module is configured to: transmitting an optical signal with a first wavelength and receiving an optical signal with a third wavelength from a second tunable optical module, and switching to transmit an optical signal with a second wavelength when the received optical signal indicates that the active link is abnormal,
wherein the second tunable optical module is configured to: transmitting an optical signal of a third wavelength and receiving an optical signal of the first wavelength from the first tunable optical module, and switching to transmit an optical signal of a fourth wavelength when the received optical signal indicates that the main link is abnormal, and
wherein the optical signal of the first wavelength and the optical signal of the third wavelength are directed to and transmitted through the active link, and the optical signal of the second wavelength and the optical signal of the fourth wavelength are directed to and transmitted through the backup link.
2. The system of claim 1, wherein the first and second tunable optical modules are further configured to determine whether an active link is abnormal by detecting an optical power of a received optical signal.
3. The system of claim 1, wherein the first and second tunable optical modules are further configured to: the optical power of the received optical signal is detected and the wavelength of the transmitted optical signal is switched when the detected optical power is below a threshold value.
4. The system of claim 1, wherein
The first and second tunable optical modules are further configured to: detecting optical power of the received optical signal, and switching a wavelength of the transmitted optical signal when the detected optical power is lower than a threshold value, and inserting a specific optical signal in the switched optical signal; and
the first and second tunable optical modules are further configured to: the wavelength of the transmitted optical signal is switched based on receiving the particular optical signal.
5. The system of claim 1, further comprising:
a first wavelength division component located between the first tunable optical module and the optical fiber link and configured to guide an optical signal of a first wavelength to the active link and an optical signal of a second wavelength to the standby link; and
and the first wave-combining component is positioned between the first tunable optical module and the optical fiber link and is configured to guide the optical signal with the third wavelength from the main link and the optical signal with the fourth wavelength from the standby link to the first tunable optical module.
6. The system of claim 1, further comprising:
a second wavelength division component located between the second tunable optical module and the optical fiber link and configured to guide an optical signal of a third wavelength to the primary link and an optical signal of a fourth wavelength to the backup link; and
and the second wave combining component is positioned between the second tunable optical module and the optical fiber link and is configured to guide the optical signal with the first wavelength from the main link and the optical signal with the second wavelength from the standby link to the second tunable optical module.
7. The system of claim 1, further comprising:
one or more further first tunable optical modules;
one or more second tunable optical modules corresponding to the one or more first tunable optical modules;
a first wavelength division multiplexing component configured to multiplex optical signals from all the first tunable optical modules to the main link and demultiplex optical signals from the main link to corresponding first tunable optical modules;
a second wavelength division multiplexing component configured to multiplex optical signals from all the first tunable optical modules to the backup link and demultiplex optical signals from the backup link to the corresponding first tunable optical modules;
a third multiplexer/demultiplexer component configured to multiplex optical signals from all the second tunable optical modules to the active link and demultiplex optical signals from the active link to corresponding second tunable optical modules; and
a fourth add/drop component configured to multiplex optical signals from all of the second tunable optical modules to the backup links and to demultiplex optical signals from the backup links to corresponding second tunable optical modules,
wherein the wavelengths of the optical signals emitted by each of all of the first tunable optical modules and all of the second tunable optical modules are different.
8. The system of any one of claims 5-7, wherein:
the first wavelength division component and the second wavelength division component are demultiplexers;
the first wave-combining component and the second wave-combining component are multiplexers;
the first multiplexer/demultiplexer component, the second multiplexer/demultiplexer component, the third multiplexer/demultiplexer component and the fourth multiplexer/demultiplexer component are a combination of a multiplexer and a demultiplexer.
9. A method of wavelength division link protection, the method comprising:
setting an optical fiber link, wherein the optical fiber link comprises a main link and a standby link;
arranging a first tunable optical module at one end of an optical fiber link;
a second tunable optical module is arranged at the other end of the optical fiber link;
configuring a first tunable optical module to: transmitting an optical signal with a first wavelength, receiving an optical signal with a third wavelength from a second tunable optical module, and switching to transmit an optical signal with a second wavelength when the received optical signal indicates that the main link is abnormal; and is
Configuring a second tunable optical module to: transmitting an optical signal of a third wavelength and receiving an optical signal of the first wavelength from the first tunable optical module, and switching to transmit an optical signal of a fourth wavelength when the received optical signal indicates that the active link is abnormal,
wherein the optical signal of the first wavelength and the optical signal of the third wavelength are directed to and transmitted through the active link, and the optical signal of the second wavelength and the optical signal of the fourth wavelength are directed to and transmitted through the backup link.
10. The method of claim 9, wherein the first and second tunable optical modules are further configured to determine whether the active link is abnormal by detecting an optical power of the received optical signal.
11. The method of claim 9, wherein,
the first and second tunable optical modules are further configured to: the optical power of the received optical signal is detected and the wavelength of the emitted optical signal is switched when the detected optical power is below a threshold.
12. The method of claim 9, wherein
The first and second tunable optical modules are further configured to: detecting optical power of the received optical signal, and switching a wavelength of the transmitted optical signal when the detected optical power is lower than a threshold value, and inserting a specific optical signal in the switched optical signal; and
the first and second tunable optical modules are further configured to: the wavelength of the transmitted optical signal is switched based on receiving the particular optical signal.
13. The method of claim 9, further comprising:
arranging a first wavelength division component between the first tunable optical module and the optical fiber link, wherein the first wavelength division component is configured to guide optical signals with a first wavelength to the main link and guide optical signals with a second wavelength to the standby link; and
and arranging a first wave-combining component between the first tunable optical module and the optical fiber link, wherein the first wave-combining component is configured to guide the optical signal with the third wavelength from the active link and the optical signal with the fourth wavelength from the standby link to the first tunable optical module.
14. The method of claim 9, further comprising:
a second wavelength division component is arranged between the second tunable optical module and the optical fiber link, and the second wavelength division component is configured to guide an optical signal with a third wavelength to the main link and guide an optical signal with a fourth wavelength to the standby link; and
and arranging a second wave-combining component between the second tunable optical module and the optical fiber link, wherein the second wave-combining component is configured to guide the optical signal with the first wavelength from the active link and the optical signal with the second wavelength from the standby link to the second tunable optical module.
15. The method of claim 9, further comprising:
setting one or more first tunable optical modules;
setting one or more first tunable optical modules corresponding to the first tunable optical module;
setting a first wavelength division multiplexing component, wherein the first wavelength division multiplexing component is configured to multiplex optical signals from all the first tunable optical modules to the main link and demultiplex optical signals from the main link to corresponding first tunable optical modules;
setting a second wavelength division multiplexing component, wherein the second wavelength division multiplexing component is configured to multiplex optical signals from all the first tunable optical modules to the standby link and demultiplex optical signals from the standby link to the corresponding first tunable optical modules;
setting a third wavelength multiplexing/demultiplexing component configured to multiplex optical signals from all the second tunable optical modules to the main link and demultiplex optical signals from the main link to corresponding second tunable optical modules; and
providing a fourth add/drop component configured to multiplex optical signals from all of the second tunable optical modules to the backup links and to demultiplex optical signals from the backup links to corresponding second tunable optical modules,
wherein the wavelengths of the optical signals emitted by each of all of the first tunable optical modules and all of the second tunable optical modules are different.
16. The method of any one of claims 13-15, wherein:
the first wavelength division component and the second wavelength division component are demultiplexers;
the first wave-combining component and the second wave-combining component are multiplexers;
the first multiplexer/demultiplexer component, the second multiplexer/demultiplexer component, the third multiplexer/demultiplexer component and the fourth multiplexer/demultiplexer component are a combination of a multiplexer and a demultiplexer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110691333.3A CN115514442A (en) | 2021-06-22 | 2021-06-22 | Wavelength division link protection system and method |
| PCT/CN2021/132017 WO2022267320A1 (en) | 2021-06-22 | 2021-11-22 | Wavelength division link protection system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110691333.3A CN115514442A (en) | 2021-06-22 | 2021-06-22 | Wavelength division link protection system and method |
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| CN115514442A true CN115514442A (en) | 2022-12-23 |
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| CN202110691333.3A Pending CN115514442A (en) | 2021-06-22 | 2021-06-22 | Wavelength division link protection system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1876736B1 (en) * | 2005-04-29 | 2015-06-10 | ZTE Corporation | Passive optical network system based on wavelength protection and protecting backup method thereof |
| EP1879307B1 (en) * | 2006-07-11 | 2008-10-08 | Alcatel Lucent | Method and apparatus for protecting a network link |
| JP5595313B2 (en) * | 2011-03-16 | 2014-09-24 | 三菱電機株式会社 | Optical network system and WDM apparatus |
| JP6106977B2 (en) * | 2012-07-23 | 2017-04-05 | 日本電気株式会社 | Optical transmission system and optical transmission method |
| US9485012B2 (en) * | 2014-10-15 | 2016-11-01 | Infinera Corporation | Optical link protection using common modulation of multiple combined wavelengths |
| EP3340503A1 (en) * | 2016-12-20 | 2018-06-27 | Xieon Networks S.à r.l. | Subcarrier diversity in optical communication systems |
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- 2021-06-22 CN CN202110691333.3A patent/CN115514442A/en active Pending
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| WO2022267320A1 (en) | 2022-12-29 |
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