CN107925474B - Wavelength alignment method and device of tunable laser, related device and system - Google Patents
Wavelength alignment method and device of tunable laser, related device and system Download PDFInfo
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- CN107925474B CN107925474B CN201580082640.4A CN201580082640A CN107925474B CN 107925474 B CN107925474 B CN 107925474B CN 201580082640 A CN201580082640 A CN 201580082640A CN 107925474 B CN107925474 B CN 107925474B
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Abstract
A wavelength alignment method, a device, a related device and a system of a tunable laser are provided, when the tunable laser emits a light signal to a first wavelength channel of a wavelength division multiplexer, the tunable laser can be automatically aligned by adjusting a wavelength control parameter for controlling the wavelength of the light signal of the tunable laser, receiving an optical time domain reflection OTDR curve generated according to the reflected signal returned by the wavelength division multiplexer, determining the value of the wavelength control parameter for aligning the wavelength of the light signal emitted by the tunable laser and the first wavelength channel according to the received OTDR curve, and configuring the tunable laser as wavelength configuration information.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a related device, and a system for wavelength alignment of a tunable laser.
Background
With the increasing demand for increasing bandwidth, in order to provide higher bandwidth in the access Network portion, Passive Optical Network (PON) technology is more and more widely used in various access Network technologies. The Passive Optical Network technology mainly includes a Time Division Multiplexing-Passive Optical Network (TDM-PON) technology and a Wavelength Division Multiplexing-Passive Optical Network (WDM-PON) technology, and the WDM-PON can provide a larger access bandwidth compared to the TDM-PON.
The PON mainly includes an Optical Line Terminal (OLT) located at a central office end, a plurality of Optical Network Units (ONUs) located at the Terminal, and an Optical Distribution Network (ODN) for implementing Optical fiber Distribution and connection from the OLT to the ONUs. The ODN generally includes an optical fiber and a wavelength division multiplexer, where the wavelength division multiplexer distributes an optical signal of the OLT to a plurality of ONUs through one optical fiber in a downlink direction, and multiplexes optical signals of the ONUs into one optical fiber in an uplink direction to transmit the optical signal to the OLT.
In the WDM-PON, the wavelength division multiplexer includes a plurality of wavelength channels, each wavelength channel corresponds to one ONU, and the wavelength of the ONU corresponding to each channel needs to fall within the wavelength channel. In order to realize flexible allocation of the ONUs and avoid producing one ONU for each wavelength, generally, a tunable laser is adopted in the ONU, before leaving a factory, a test of parameter scanning and wavelength calibration needs to be performed on each tunable laser to obtain parameter values corresponding to all wavelengths, respectively, a wavelength parameter mapping table of the wavelengths and the parameters is established, when the ONU works, the parameters of the tunable laser are reasonably set according to the wavelength parameter mapping table, and light with the wavelength corresponding to the set parameters can be generated, so that the transmission performance of the tunable laser is ensured.
Therefore, in the prior art, a wavelength parameter mapping table needs to be established by testing the tunable laser in the ONU for a long time before leaving the factory, which may greatly reduce the production efficiency of the tunable laser.
Disclosure of Invention
The embodiment of the invention provides a wavelength alignment method, a wavelength alignment device, related devices and a wavelength alignment system of a tunable laser, which are used for realizing the automatic alignment of the wavelength of the tunable laser so as to avoid testing the tunable laser in an ONU for a long time before leaving a factory, thereby improving the production efficiency of the tunable laser.
In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions:
a first aspect of the present application provides a method of wavelength alignment of a tunable laser, comprising:
when a tunable laser emits an optical signal to a first wavelength channel of a wavelength division multiplexer, adjusting a wavelength control parameter for controlling the wavelength of the optical signal, receiving an Optical Time Domain Reflection (OTDR) curve generated according to a reflection signal returned from the wavelength division multiplexer, determining wavelength configuration information according to the received OTDR curve, and configuring the tunable laser with the wavelength configuration information;
wherein the wavelength configuration information is a value of the wavelength control parameter that aligns a wavelength of an optical signal emitted by the tunable laser with the first wavelength channel.
As a first example of the first aspect of the present application, the adjusting a wavelength control parameter for controlling a wavelength of the optical signal and receiving an optical time domain reflection OTDR curve generated from a reflection signal returned from the wavelength division multiplexer, and determining wavelength configuration information according to the received OTDR curve includes:
adjusting the wavelength control parameter to cause the wavelength of the optical signal to vary by a first further length and receiving a first OTDR curve generated from a reflected signal returned from the wavelength division multiplexer; the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
determining first configuration information according to the first OTDR curve; the first configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall at an edge of the first wavelength channel;
continuing to adjust the wavelength control parameter based on the first configuration information to change the wavelength of the optical signal by a second step length and receiving a second OTDR curve generated from a reflected signal returned from the wavelength division multiplexer; the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
determining second configuration information according to the second OTDR curve; the second configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
and taking the second configuration information as the wavelength configuration information.
As a second example of the first aspect of the present application, the wavelength control parameter includes: a first parameter and a second parameter;
then, the adjusting a wavelength control parameter for controlling a wavelength of the optical signal, and receiving an optical time domain reflection OTDR curve generated according to a reflection signal returned from the wavelength division multiplexer, and determining wavelength configuration information according to the received OTDR curve includes:
adjusting the first parameter such that the wavelength of the optical signal varies by a first further length and receiving a third OTDR curve generated from a reflected signal returned from the wavelength division multiplexer; the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
determining third configuration information according to the third OTDR curve; the third configuration information is a value of the first parameter that causes a wavelength of the optical signal to fall on an edge of the first wavelength channel;
adjusting the second parameter on the basis of the third configuration information to change the wavelength of the optical signal by a second step length, and receiving a fourth OTDR curve generated from a reflected signal returned from the wavelength division multiplexer; the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
determining fourth configuration information according to the fourth OTDR curve; the fourth configuration information is a value of the second parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
and taking the third configuration information and the fourth configuration information as the wavelength configuration information.
As a third example of the first aspect of the present application, the adjusting a wavelength control parameter for controlling a wavelength of the optical signal and receiving an optical time domain reflection OTDR curve generated from a reflection signal returned from the wavelength division multiplexer, and determining wavelength configuration information according to the received OTDR curve includes:
selecting a value of the wavelength control parameter matched with the first wavelength channel from a pre-stored wavelength parameter mapping table, so as to transmit an optical signal to the first wavelength channel from the value of the wavelength control parameter selected from the wavelength parameter mapping table, receiving an OTDR curve generated according to a reflected signal returned from the wavelength division multiplexer, judging whether the wavelength of the optical signal is aligned with the first wavelength channel according to the received OTDR curve, and if so, using the value of the wavelength control parameter selected from the wavelength parameter mapping table as the wavelength configuration information.
As a fourth example of the first aspect of the present application, the determining wavelength configuration information according to the received OTDR curve includes:
searching an extreme point with minimum loss from the received OTDR curve;
determining a wavelength of the optical signal corresponding to the reflected signal of the extreme point as an alignment wavelength;
determining a value of the wavelength control parameter corresponding to the alignment wavelength as the wavelength configuration information.
A second aspect of the present application provides a wavelength alignment apparatus for a tunable laser, including:
the optical time domain reflection OTDR system comprises an OTDR module, a wavelength division multiplexer and a control module, wherein the OTDR module is used for generating an optical time domain reflection OTDR curve according to a reflection signal returned by the wavelength division multiplexer when a tunable laser transmits a light signal to a first wavelength channel of the wavelength division multiplexer;
an alignment module, configured to adjust a wavelength control parameter for controlling a wavelength of an optical signal when the tunable laser transmits the optical signal to a first wavelength channel of a wavelength division multiplexer, receive an optical time domain reflection OTDR curve generated by the OTDR module according to a reflection signal returned from the wavelength division multiplexer, determine wavelength configuration information according to the received OTDR curve, and configure the tunable laser with the wavelength configuration information;
wherein the wavelength configuration information is a value of the wavelength control parameter that aligns a wavelength of an optical signal emitted by the tunable laser with the first wavelength channel.
As a first example of the second aspect of the present application, the alignment module includes:
a first adjusting unit for adjusting the wavelength control parameter so that the wavelength of the optical signal changes by a first step length, and receiving a first OTDR curve generated from a reflected signal returned from the wavelength division multiplexer; the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
a first determining unit, configured to determine first configuration information according to the first OTDR curve; the first configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall at an edge of the first wavelength channel;
a second adjusting unit, configured to continue to adjust the wavelength control parameter on the basis of the first configuration information, so that the wavelength of the optical signal changes by a second step length, and receive a second OTDR curve generated according to a reflected signal returned from the wavelength division multiplexer; the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
a second determining unit, configured to determine second configuration information according to the second OTDR curve; the second configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
and the first alignment unit is used for taking the second configuration information as the wavelength configuration information.
As a second example of the second aspect of the present application, the wavelength control parameter includes: a first parameter and a second parameter;
then, the alignment module includes:
a third adjusting unit for adjusting the first parameter so that the wavelength of the optical signal changes by a first further length, and receiving a third OTDR curve generated from a reflected signal returned from the wavelength division multiplexer; the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
a third determining unit, configured to determine third configuration information according to the third OTDR curve; the third configuration information is a value of the first parameter that causes a wavelength of the optical signal to fall on an edge of the first wavelength channel;
a fourth adjusting unit configured to adjust the second parameter on the basis of the third configuration information so that the wavelength of the optical signal changes by a second step length, and receive a fourth OTDR curve generated from a reflected signal returned from the wavelength division multiplexer; the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
a fourth determining unit, configured to determine fourth configuration information according to the fourth OTDR curve; the fourth configuration information is a value of the second parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
a second alignment unit, configured to use the third configuration information and the fourth configuration information as the wavelength configuration information.
As a third example of the second aspect of the present application, the alignment module is specifically configured to:
selecting a value of the wavelength control parameter matched with the first wavelength channel from a pre-stored wavelength parameter mapping table, so as to transmit an optical signal to the first wavelength channel from the value of the wavelength control parameter selected from the wavelength parameter mapping table, receiving an OTDR curve generated according to a reflected signal returned from the wavelength division multiplexer, judging whether the wavelength of the optical signal is aligned with the first wavelength channel according to the received OTDR curve, and if so, using the value of the wavelength control parameter selected from the wavelength parameter mapping table as the wavelength configuration information.
As a fourth example of the second aspect of the present application, the alignment module includes:
a searching unit, configured to search an extreme point with the smallest loss from the received OTDR curve;
an alignment wavelength determining unit for determining a wavelength of the optical signal corresponding to the reflection signal of the extreme point as an alignment wavelength;
a configuration information determining unit configured to determine a value of the wavelength control parameter corresponding to the alignment wavelength as the wavelength configuration information.
A third aspect of the present application also provides a tunable laser including the wavelength alignment device of the tunable laser described in any one of the above.
A fourth aspect of the present application also provides an optical network unit, including the tunable laser described above.
A fifth aspect of the present application further provides a wavelength division multiplexing passive optical network system, including the above optical network unit.
It can be seen from the above that, according to the wavelength alignment method, apparatus, related device and system of the tunable laser provided by the present invention, when the tunable laser emits an optical signal to the first wavelength channel of the wavelength division multiplexer, the tunable laser may configure the tunable laser by adjusting a wavelength control parameter for controlling the wavelength of the optical signal of the tunable laser, receiving an optical time domain reflection OTDR curve generated according to a reflection signal returned from the wavelength division multiplexer, determining a value of the wavelength control parameter for aligning the wavelength of the optical signal emitted by the tunable laser with the first wavelength channel according to the received OTDR curve, and using the value as wavelength configuration information, that is, when the tunable laser is used, the automatic wavelength alignment may be implemented through the OTDR curve, which may avoid performing a long-time test on the tunable laser in the ONU before leaving the factory, thereby improving the production efficiency of the tunable laser.
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, and 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 these drawings without creative efforts.
Fig. 1 is a schematic flowchart of an embodiment of a wavelength alignment method for a tunable laser provided in the present application;
fig. 2 is a schematic flowchart of another embodiment of a wavelength alignment method for a tunable laser provided in the present application;
FIG. 3 is a schematic flow chart illustrating a method for wavelength alignment of a tunable laser according to another embodiment of the present disclosure;
FIG. 4 is a schematic flow chart illustrating a method for wavelength alignment of a tunable laser according to yet another embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an embodiment of a wavelength alignment apparatus of a tunable laser provided in the present application;
fig. 6 is a schematic structural diagram of another embodiment of a wavelength alignment apparatus of a tunable laser provided in the present application;
fig. 7 is a schematic structural diagram of a further embodiment of a wavelength alignment apparatus of a tunable laser provided in the present application;
fig. 8 is a schematic structural diagram of a further embodiment of a wavelength alignment apparatus of a tunable laser provided in the present application;
fig. 9 is a schematic structural diagram of an embodiment of an optical network unit provided in the present application.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the application is described in detail below with reference to the accompanying drawings:
in a wavelength division multiplexing passive optical network system, a tunable laser is usually adopted in an optical network unit ONU, a laser manufacturer performs parameter scanning and wavelength calibration tests on the tunable laser before the tunable laser leaves a factory to obtain values of wavelength control parameters corresponding to all working wavelengths, establishes a wavelength parameter mapping table of wavelengths and parameters, and reasonably sets the parameters of the tunable laser according to the wavelength parameter mapping table during working, so that optical signals with wavelengths corresponding to the set parameters can be generated, and the transmission performance of the tunable laser is ensured.
For the 2-segment type tunable laser, the corresponding relation between the values of 1 wavelength control parameter and the wavelength needs to be scanned during factory test; for a 3-segment tunable laser, such as a Distributed Bragg Reflector (DBR) laser, wavelength tuning requires tuning of a Bragg Reflector current and a phase region current at the same time, and therefore, when a factory test is performed, a corresponding relationship between values of 2 wavelength control parameters, i.e., the phase region current and the Bragg Reflector current, and a wavelength needs to be scanned. No matter be 2 segmentations adjustable laser or 3 segmentations adjustable laser, all need carry out complicated loaded down with trivial details scanning when dispatching from the factory to test, this efficiency that dispatches from the factory that can seriously reduce the product for the cost of product is comparatively high, if can realize the online automatically regulated of the wavelength of adjustable laser, will improve adjustable laser's production efficiency, reduces adjustable laser's cost.
In the application scenario, the application provides a wavelength alignment method, a wavelength alignment device, a related device and a wavelength alignment system for a tunable laser.
Fig. 1 is a schematic flowchart of an embodiment of a method for wavelength alignment of a tunable laser according to the present invention.
Referring to fig. 1, a method provided in an embodiment of the present application includes the following steps:
s100: adjusting a wavelength control parameter for controlling a wavelength of an optical signal when a tunable laser transmits the optical signal to a first wavelength channel of a wavelength division multiplexer;
in this embodiment, the first wavelength channel may be any one channel selected by the tunable laser, or may be one channel selected by the tunable laser according to a command in the downlink direction.
In the embodiment of the present application, the wavelength control parameter may be one or more.
If the tunable laser has only one wavelength control parameter, adjusting the wavelength control parameter; if the tunable laser has a plurality of wavelength control parameters, all the wavelength control parameters of the tunable laser may be adjusted, or only a part of the wavelength control parameters of the tunable laser may be adjusted.
When the tunable laser emits a light signal to the first wavelength channel of the wavelength division multiplexer, the wavelength control parameter for controlling the wavelength of the light signal is adjusted, so that the wavelength of the tunable laser can be automatically adjusted when the tunable laser is in a working state, and the tunable laser does not need to be subjected to test work such as parameter scanning, wavelength calibration and the like when leaving a factory.
S200: receiving an optical time domain reflection OTDR curve generated from a reflected signal returned from the wavelength division multiplexer;
when an optical signal is transmitted to a wavelength division multiplexer, scattering and reflection may occur due to the nature of the optical fiber, connectors, splices, bends, or other similar events. The OTDR technique uses rayleigh scattering and fresnel reflection to characterize the fiber, so the degree of alignment of the tunable laser and the first wavelength channel can be reflected by the degree of attenuation (loss/distance) of the OTDR curve generated from the reflected signal returned by the wavelength division multiplexer.
The embodiment of the application realizes the adjustment of the wavelength of the tunable laser by using an optical Time Domain reflectometer (optical Time Domain reflectometer) technology, and when the tunable laser emits a light signal to a first wavelength channel of a wavelength division multiplexer, after adjusting a wavelength control parameter for controlling the wavelength of the light signal each Time, a collection device arranged between the tunable laser and the wavelength division multiplexer can collect a reflection signal returned from the wavelength division multiplexer, and then an optical Time Domain reflection OTDR curve is generated according to the reflection signal after each adjustment.
S300: and determining wavelength configuration information according to the received OTDR curve, and configuring the tunable laser according to the wavelength configuration information.
In this embodiment of the application, the determining wavelength configuration information according to the received OTDR curve may include: searching an extreme point with minimum loss from the received OTDR curve; determining a wavelength of the optical signal corresponding to the reflected signal of the extreme point as an alignment wavelength; determining a value of the wavelength control parameter corresponding to the alignment wavelength as the wavelength configuration information.
Wherein the wavelength configuration information is a value of the wavelength control parameter that aligns a wavelength of an optical signal emitted by the tunable laser with the first wavelength channel.
In the embodiment of the present application, the wavelength of the optical signal corresponding to the point with the smaller loss or attenuation of the OTDR curve is more matched with the transmission peak wavelength of the first wavelength channel of the wavelength division multiplexer, that is, the wavelength of the optical signal corresponding to the extreme point with the smallest loss or attenuation in the OTDR curve is aligned with the first wavelength channel.
As can be seen from the above, according to the wavelength alignment method for the tunable laser provided by the present invention, when the tunable laser emits the optical signal to the first wavelength channel of the wavelength division multiplexer, the tunable laser can be configured by adjusting the wavelength control parameter for controlling the wavelength of the optical signal of the tunable laser, receiving the optical time domain reflection OTDR curve generated according to the reflection signal returned from the wavelength division multiplexer, determining the value of the wavelength control parameter for aligning the wavelength of the optical signal emitted by the tunable laser with the first wavelength channel according to the received OTDR curve, and using the value as the wavelength configuration information to configure the tunable laser, that is, the tunable laser can be automatically aligned by using the OTDR curve when the tunable laser is used, so that the tunable laser in the ONU can be prevented from being tested for a long time before leaving the factory, and thus the production efficiency of the tunable laser can be improved.
Moreover, according to the method provided by the application, any reflector is not required to be added on the link, the wavelength division multiplexer is directly used for reflecting the reflected signal of the tunable laser, and the signal reflected by the reflector arranged in the link is not used, so that compared with the scheme that the reflector is required to be added, the complexity of the link can be reduced, the extra insertion loss caused by the addition of the reflector is avoided, meanwhile, the signal reflected by the reflector is prevented from being influenced by the reflection between the wavelength division multiplexer and the tunable laser, and the wavelength adjusting result can be more accurate.
In this application, since there is no wavelength parameter mapping table for storing the correspondence between the characteristic wavelength and the wavelength control parameter in the tunable laser, the method provided in the following embodiment may be adopted when performing wavelength alignment:
fig. 2 is a schematic flowchart of another embodiment of a method for wavelength alignment of a tunable laser according to the present invention.
The embodiment of the application provides a wavelength alignment method for a tunable laser with one wavelength control parameter.
Referring to fig. 2, a method provided in an embodiment of the present application includes the following steps:
s110: adjusting a wavelength control parameter for controlling a wavelength of the optical signal when the tunable laser transmits the optical signal to a first wavelength channel of a wavelength division multiplexer, such that the wavelength of the optical signal varies by a first further length;
the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
when the tunable laser is a general tunable laser with a single wavelength control parameter (for example, a tunable laser with a wavelength controlled by temperature), a first step length may be set, and a wavelength corresponding to the first step length is in a direct proportion to a channel width of the wavelength division multiplexer, so that at least one of two wavelengths (two boundaries of the first step length) to be tuned at a time may fall within one wavelength channel.
S210: receiving a first OTDR curve generated from a reflected signal returned from the wavelength division multiplexer;
s310: determining first configuration information according to the first OTDR curve;
the first configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall at an edge of the first wavelength channel;
in the embodiment of the present application, an initial wavelength of the tunable laser may also be set, where the initial wavelength may start from 0, and may also be an arbitrary value.
Starting from the initial wavelength, an OTDR curve generated from a reflected signal returned from the wavelength division multiplexer may be received after adjusting the wavelength according to the first further length each time, and then it is determined whether the adjusted wavelength falls on an edge of the first wavelength channel or falls within the first wavelength channel according to the OTDR curve, if the adjusted wavelength falls on an edge of the first wavelength channel or falls within the first wavelength channel, the next step is started, otherwise, the next wavelength is continuously adjusted by the first further length.
S410: continuing to adjust the wavelength control parameter based on the first configuration information to change the wavelength of the optical signal by a second step length and receiving a second OTDR curve generated from a reflected signal returned from the wavelength division multiplexer;
the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
s510: determining second configuration information according to the second OTDR curve;
the second configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
in the embodiment of the present application, a second step length for adjusting the wavelength may be set, and the second step length may be 1/N of the channel width of the wavelength division multiplexer, where N may be 2, 3, 4, 5, 6, or the like, which is a number greater than 1. When the wavelength after a certain step of adjustment falls on the edge of the first wavelength channel or falls in the first wavelength channel, the wavelength can be finely adjusted on the basis of the first configuration information (the first configuration information is used as the initial value of the wavelength control parameter, and the wavelength control parameter is continuously adjusted) according to the second step length until the wavelength is judged to fall on the center of the first wavelength channel according to the OTDR curve, and the second configuration information obtained at this time is the wavelength configuration information of the tunable laser for aligning the wavelength with the first wavelength channel.
S610: and taking the second configuration information as the wavelength configuration information, and configuring the tunable laser with the wavelength configuration information.
According to the technical scheme provided by the embodiment of the application, the wavelength is roughly adjusted by utilizing the first step length through two preset step lengths, the adjusted wavelength is ensured to fall on the edge of a first wavelength channel or fall in the first wavelength channel, the wavelength is finely adjusted by utilizing the second step length, the adjusted wavelength is ensured to fall on the center of the first wavelength channel, and the on-line automatic alignment of the wavelength of a common adjustable laser with single wavelength control parameter can be realized.
Fig. 3 is a schematic flowchart of a wavelength alignment method for a tunable laser according to another embodiment of the present invention.
The embodiment of the present application also provides a wavelength alignment method for a tunable laser with a plurality of wavelength control parameters.
Referring to fig. 3, in the method provided in the embodiment of the present application, the wavelength control parameter includes: first and second parameters:
s120: adjusting the first parameter while the tunable laser is transmitting an optical signal to a first wavelength channel of a wavelength division multiplexer, such that the wavelength of the optical signal varies by a first further length;
the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
when the wavelength control parameter is a plurality of tunable lasers (for example, the wavelength control parameter includes a DBR laser of a phase section current and a DBR laser of a DBR section current), a first further length may be set, and a wavelength corresponding to the first further length is in a direct proportion to a channel width of the wavelength division multiplexer, so that at least one of two wavelengths (two boundaries of the first further length) that are tuned at one time may fall within one wavelength channel.
S220: receiving a third OTDR curve generated from a reflected signal returned from the wavelength division multiplexer;
s320: determining third configuration information according to the third OTDR curve; the third configuration information is a value of the first parameter that causes a wavelength of the optical signal to fall on an edge of the first wavelength channel;
in the embodiment of the present application, an initial value of the first parameter may also be set, where the initial value may be from 0, or may be any value.
Starting from the initial value, an OTDR curve generated from a reflected signal returned from the wavelength division multiplexer may be received after adjusting the wavelength by the first further length each time, and then it is determined whether the adjusted wavelength falls on an edge of or within the first wavelength channel according to the OTDR curve, if so, the next step is started, otherwise, the next wavelength is continuously adjusted by the first further length.
In this embodiment, the second parameter is fixed and then the first parameter is adjusted, for example, in the case of a DBR laser, a fixed phase section current may be set, and then the DBR section current is adjusted at the phase section current, and then the DBR section current, which makes the wavelength of the tunable laser fall at the edge of the first communication channel or in the first communication channel, is obtained according to the OTDR curve as the third configuration information.
S420: adjusting the second parameter on the basis of the third configuration information to change the wavelength of the optical signal by a second step length, and receiving a fourth OTDR curve generated from a reflected signal returned from the wavelength division multiplexer; the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
s520: determining fourth configuration information according to the fourth OTDR curve; the fourth configuration information is a value of the second parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
in the embodiment of the present application, a second step length for adjusting the wavelength may be set, and the second step length may be 1/N of the channel width of the wavelength division multiplexer, where N may be 2, 3, 4, 5, 6, or the like, which is a number greater than 1. When the wavelength after the first parameter is adjusted in a certain step falls on the edge of the first wavelength channel or falls in the first wavelength channel, the wavelength can be finely adjusted by using a second parameter (the third configuration information is used as a fixed value of the first parameter, and the second parameter is adjusted) on the basis of third configuration information according to a second step length until the wavelength is judged to fall on the center of the first wavelength channel according to the OTDR curve, and the third configuration information and the fourth configuration information obtained at this time are respectively the wavelength configuration information of the first parameter and the second parameter of the tunable laser which enables the wavelength to be aligned with the first wavelength channel.
Continuing with the DBR laser as an example, after fixing the first parameter, i.e., the DBR-section current, as the third configuration information, the second parameter, i.e., the phase-section current, may be fine-tuned, and then the DBR-section current corresponding to the wavelength falling at the center of the first wavelength channel is obtained according to the OTDR curve, as the fourth configuration information.
S620: and using the third configuration information and the fourth configuration information as the wavelength configuration information, and configuring the tunable laser with the wavelength configuration information.
According to the technical scheme provided by the embodiment of the application, the wavelength controlled by the first parameter is roughly adjusted by utilizing the first step length through two preset step lengths, the adjusted wavelength is ensured to fall on the edge of the first wavelength channel or fall in the first wavelength channel, the wavelength controlled by the second parameter is finely adjusted by utilizing the second step length, the adjusted wavelength is ensured to fall on the center of the first wavelength channel, and the on-line automatic alignment of the wavelength of the tunable laser with a plurality of wavelength control parameters can be realized.
Moreover, in the present application, the OTDR curve is used to implement adjustment of multiple wavelength control parameters, rather than implementing adjustment of multiple wavelength control parameters by monitoring reflected light power, and a DBR laser, which has multiple wavelength control parameters, is taken as an example, when the monitored reflected light power is maximum, a side-to-touch Suppression Ratio (SMSR) of an emission spectrum may be very small, so that, compared with a scheme for monitoring reflected light power, the present application can avoid a phenomenon that the side-to-touch Suppression Ratio is very small when the wavelength is aligned, and can further ensure transmission performance of the tunable laser having multiple wavelength control parameters.
In addition to the above embodiments, the present application also provides a wavelength alignment method for a tunable laser in which a wavelength parameter mapping table representing a correspondence between a wavelength and a wavelength control parameter is stored:
fig. 4 is a schematic flowchart of a wavelength alignment method for a tunable laser according to still another embodiment of the present invention.
Referring to fig. 4, a method provided in an embodiment of the present application includes the following steps:
s130: when the tunable laser emits an optical signal to a first wavelength channel of a wavelength division multiplexer, selecting a value of the wavelength control parameter matched with the first wavelength channel from a pre-stored wavelength parameter mapping table;
s230: transmitting an optical signal to the first wavelength channel at a value of the wavelength control parameter selected from the wavelength parameter mapping table and receiving an OTDR curve generated from a reflected signal returned from the wavelength division multiplexer;
s330: judging whether the wavelength of the optical signal is aligned with the first wavelength channel or not according to the received OTDR curve;
s430: and if so, taking the value of the wavelength control parameter selected from the wavelength parameter mapping table as the wavelength configuration information, and configuring the tunable laser with the wavelength configuration information.
Wherein the wavelength configuration information is a value of the wavelength control parameter that aligns a wavelength of an optical signal emitted by the tunable laser with the first wavelength channel.
In this embodiment of the present application, when a tunable laser transmits an optical signal to a first wavelength channel of a wavelength division multiplexer, a value of a wavelength control parameter matched with the first wavelength channel is selected from a wavelength parameter mapping table to set the tunable laser, and then, whether a wavelength is aligned with the first wavelength channel is determined according to a received OTDR curve, and if the wavelength is aligned with the first wavelength channel, the method is terminated, and the value of the wavelength control parameter selected from the wavelength parameter mapping table is used as the wavelength configuration information, so as to configure the tunable laser with the wavelength configuration information. Otherwise, a wavelength channel may be reselected and the above steps may be re-performed.
Therefore, when the wavelength parameter mapping table is prestored in the tunable laser, the wavelength can be aligned through the wavelength parameter mapping table, and the method is simple and convenient.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention.
The invention discloses a wavelength alignment method of a tunable laser, and correspondingly, the invention also discloses a wavelength alignment device applying the wavelength alignment method.
Fig. 5 is a schematic structural diagram of an embodiment of a wavelength alignment apparatus of a tunable laser provided in the present application.
Referring to fig. 5, an apparatus provided in an embodiment of the present application includes:
an OTDR module 1, configured to generate an optical time domain reflection OTDR curve according to a reflection signal returned from a wavelength division multiplexer when an optical signal is transmitted from an adjustable laser to a first wavelength channel of the wavelength division multiplexer;
an alignment module 2, configured to, when an adjustable laser transmits an optical signal to a first wavelength channel of a wavelength division multiplexer, adjust a wavelength control parameter for controlling a wavelength of the optical signal, receive an optical time domain reflection OTDR curve generated by the OTDR module 1 according to a reflection signal returned from the wavelength division multiplexer, determine wavelength configuration information according to the received OTDR curve, and configure the adjustable laser with the wavelength configuration information;
wherein the wavelength configuration information is a value of the wavelength control parameter that aligns a wavelength of an optical signal emitted by the tunable laser with the first wavelength channel.
Fig. 6 is a schematic structural diagram of another embodiment of a wavelength alignment apparatus of a tunable laser provided in the present application.
Referring to fig. 6, an apparatus provided in this embodiment of the present application, on the basis of the previous embodiment, the alignment module 2 includes:
a first adjusting unit 201, configured to adjust the wavelength control parameter, change the wavelength of the optical signal by a first further length, and receive a first OTDR curve generated according to a reflected signal returned from the wavelength division multiplexer; the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
a first determining unit 202, configured to determine first configuration information according to the first OTDR curve; the first configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall at an edge of the first wavelength channel;
a second adjusting unit 203, configured to continue to adjust the wavelength control parameter on the basis of the first configuration information, so that the wavelength of the optical signal changes by a second step length, and receive a second OTDR curve generated according to a reflected signal returned from the wavelength division multiplexer; the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
a second determining unit 204, configured to determine second configuration information according to the second OTDR curve; the second configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
a first alignment unit 205, configured to use the second configuration information as the wavelength configuration information.
Fig. 7 is a schematic structural diagram of a wavelength alignment apparatus of a tunable laser according to still another embodiment of the present disclosure.
Referring to fig. 7, an apparatus provided in this embodiment of the present application, on the basis of the foregoing embodiment, the wavelength control parameter includes: a first parameter and a second parameter;
then, the alignment module 2 includes:
a third adjusting unit 211, configured to adjust the first parameter, change the wavelength of the optical signal by a first further length, and receive a third OTDR curve generated according to a reflected signal returned from the wavelength division multiplexer; the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
a third determining unit 212, configured to determine third configuration information according to the third OTDR curve; the third configuration information is a value of the first parameter that causes a wavelength of the optical signal to fall on an edge of the first wavelength channel;
a fourth adjusting unit 213, configured to adjust the second parameter on the basis of the third configuration information, so that the wavelength of the optical signal changes by a second step length, and receive a fourth OTDR curve generated according to a reflected signal returned from the wavelength division multiplexer; the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
a fourth determining unit 214, configured to determine fourth configuration information according to the fourth OTDR curve; the fourth configuration information is a value of the second parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
a second alignment unit 215, configured to use the third configuration information and the fourth configuration information as the wavelength configuration information.
Fig. 8 is a schematic structural diagram of a wavelength alignment apparatus of a tunable laser according to still another embodiment of the present disclosure.
Referring to fig. 8, in the apparatus provided in the embodiment of the present application, on the basis of the above embodiment, the alignment module 2 includes:
a searching unit 221, configured to search an extreme point with the smallest loss from the received OTDR curve;
an alignment wavelength determination unit 222 for determining a wavelength of the optical signal corresponding to the reflection signal of the extreme point as an alignment wavelength;
a configuration information determining unit 223 for determining a value of the wavelength control parameter corresponding to the alignment wavelength as the wavelength configuration information.
In addition, when the wavelength parameter mapping table is pre-stored in the tunable laser, the alignment module 2 may be further specifically configured to:
selecting a value of the wavelength control parameter matched with the first wavelength channel from a pre-stored wavelength parameter mapping table, so as to transmit an optical signal to the first wavelength channel from the value of the wavelength control parameter selected from the wavelength parameter mapping table, receiving an OTDR curve generated according to a reflected signal returned from the wavelength division multiplexer, judging whether the wavelength of the optical signal is aligned with the first wavelength channel according to the received OTDR curve, and if so, using the value of the wavelength control parameter selected from the wavelength parameter mapping table as the wavelength configuration information.
The present application further provides a tunable laser, including the wavelength alignment apparatus of the tunable laser according to any of the above embodiments.
Fig. 9 is a schematic structural diagram of an embodiment of an optical network unit provided in the present application.
Referring to fig. 9, an optical network unit provided in this embodiment of the present application includes the Tunable Laser (TL) in the above embodiment, and further includes an OTDR signal Receiver (RX) and an OTDR Chip (OTDR Chip).
The Tunable Laser (TL) sends an optical signal to the wavelength division multiplexer (AWG), and the OTDR Chip (OTDR Chip) collects a reflected signal returned from the wavelength division multiplexer (AWG) through an OTDR signal Receiver (RX) and generates an OTDR curve according to the reflected signal.
The application also provides a wavelength division multiplexing passive optical network system which comprises the optical network unit.
It should be noted that the wavelength alignment apparatus, the tunable laser, the optical network unit, and the wavelength division multiplexing passive optical network system of the tunable laser provided in all the apparatus embodiments of the present application may all adopt the wavelength alignment method of the tunable laser in the above method embodiments, and may be used to implement all technical solutions in the above method embodiments, functions of each functional module of the tunable laser may be specifically implemented according to the method in the above method embodiments, and specific implementation processes of the functional modules may refer to relevant descriptions in the above embodiments, and are not described herein again.
For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, the functionality of the various modules may be implemented in the same one or more software and/or hardware implementations as the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in random access memory RAM, memory, read only memory ROM, electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A method of wavelength alignment for a tunable laser, comprising:
when a tunable laser emits an optical signal to a first wavelength channel of a wavelength division multiplexer, adjusting a wavelength control parameter for controlling the wavelength of the optical signal, generating an Optical Time Domain Reflection (OTDR) curve according to a reflection signal returned from the wavelength division multiplexer, determining wavelength configuration information according to the OTDR curve, and configuring the tunable laser according to the wavelength configuration information; the tunable laser is arranged in an optical network unit ONU of a wavelength division multiplexing passive optical network WDM-PON;
the determining wavelength configuration information according to the OTDR curve includes:
searching an extreme point with minimum loss from the OTDR curve;
determining a wavelength of the optical signal corresponding to the reflected signal of the extreme point as an alignment wavelength;
determining a value of the wavelength control parameter corresponding to the alignment wavelength as the wavelength configuration information; wherein the wavelength configuration information is a value of the wavelength control parameter that aligns a wavelength of an optical signal emitted by the tunable laser with the first wavelength channel.
2. A method according to claim 1, wherein said adjusting wavelength control parameters for controlling the wavelength of said optical signal and generating an optical time domain reflection, OTDR curve from the reflected signal returned from said wavelength division multiplexer, determining wavelength configuration information from said OTDR curve, comprises:
adjusting the wavelength control parameter to cause the wavelength of the optical signal to vary by a first further length and to generate a first OTDR curve from a reflected signal returned from the wavelength division multiplexer; the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
determining first configuration information according to the first OTDR curve; the first configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall at an edge of the first wavelength channel;
continuing to adjust the wavelength control parameter on the basis of the first configuration information to change the wavelength of the optical signal by a second step length, and generating a second OTDR curve according to a reflected signal returned from the wavelength division multiplexer; the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
determining second configuration information according to the second OTDR curve; the second configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
and taking the second configuration information as the wavelength configuration information.
3. The method of claim 1, wherein the wavelength control parameters comprise: a first parameter and a second parameter;
then, the adjusting a wavelength control parameter for controlling the wavelength of the optical signal, generating an optical time domain reflection OTDR curve according to a reflection signal returned from the wavelength division multiplexer, and determining wavelength configuration information according to the OTDR curve includes:
adjusting the first parameter to cause the wavelength of the optical signal to vary by a first further length and to generate a third OTDR curve from a reflected signal returned from the wavelength division multiplexer; the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
determining third configuration information according to the third OTDR curve; the third configuration information is a value of the first parameter that causes a wavelength of the optical signal to fall on an edge of the first wavelength channel;
adjusting the second parameter on the basis of the third configuration information to change the wavelength of the optical signal by a second step length, and generating a fourth OTDR curve according to a reflected signal returned from the wavelength division multiplexer; the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
determining fourth configuration information according to the fourth OTDR curve; the fourth configuration information is a value of the second parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
and taking the third configuration information and the fourth configuration information as the wavelength configuration information.
4. A method according to claim 1, wherein said adjusting wavelength control parameters for controlling the wavelength of said optical signal and generating an optical time domain reflection, OTDR curve from the reflected signal returned from said wavelength division multiplexer, determining wavelength configuration information from said OTDR curve, comprises:
selecting a value of the wavelength control parameter matched with the first wavelength channel from a pre-stored wavelength parameter mapping table, so as to transmit an optical signal to the first wavelength channel from the value of the wavelength control parameter selected from the wavelength parameter mapping table, generating an OTDR curve according to a reflected signal returned from the wavelength division multiplexer, judging whether the wavelength of the optical signal is aligned with the first wavelength channel according to the OTDR curve, and if so, using the value of the wavelength control parameter selected from the wavelength parameter mapping table as the wavelength configuration information.
5. A wavelength alignment apparatus for a tunable laser, comprising:
the optical time domain reflection OTDR system comprises an OTDR module, a wavelength division multiplexer and a control module, wherein the OTDR module is used for generating an optical time domain reflection OTDR curve according to a reflection signal returned by the wavelength division multiplexer when a tunable laser transmits a light signal to a first wavelength channel of the wavelength division multiplexer; the tunable laser is arranged in an optical network unit ONU of a wavelength division multiplexing passive optical network WDM-PON;
an alignment module, configured to adjust a wavelength control parameter for controlling a wavelength of an optical signal when a tunable laser transmits the optical signal to a first wavelength channel of a wavelength division multiplexer, and determine wavelength configuration information according to the OTDR curve, and configure the tunable laser with the wavelength configuration information;
the alignment module, comprising:
a searching unit, configured to search an extreme point with the smallest loss from the received OTDR curve;
an alignment wavelength determining unit for determining a wavelength of the optical signal corresponding to the reflection signal of the extreme point as an alignment wavelength;
a configuration information determining unit for determining a value of the wavelength control parameter corresponding to the alignment wavelength as the wavelength configuration information;
wherein the wavelength configuration information is a value of the wavelength control parameter that aligns a wavelength of an optical signal emitted by the tunable laser with the first wavelength channel.
6. The apparatus of claim 5, wherein the alignment module comprises:
a first adjusting unit, configured to adjust the wavelength control parameter, change the wavelength of the optical signal by a first step length, and generate a first OTDR curve according to a reflected signal returned from the wavelength division multiplexer; the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
a first determining unit, configured to determine first configuration information according to the first OTDR curve; the first configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall at an edge of the first wavelength channel;
a second adjusting unit, configured to continue to adjust the wavelength control parameter on the basis of the first configuration information, so that the wavelength of the optical signal changes by a second step length, and generate a second OTDR curve according to a reflected signal returned from the wavelength division multiplexer; the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
a second determining unit, configured to determine second configuration information according to the second OTDR curve; the second configuration information is a value of the wavelength control parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
and the first alignment unit is used for taking the second configuration information as the wavelength configuration information.
7. The apparatus of claim 5, wherein the wavelength control parameters comprise: a first parameter and a second parameter;
then, the alignment module includes:
a third adjusting unit, configured to adjust the first parameter, change the wavelength of the optical signal by a first further length, and generate a third OTDR curve according to a reflected signal returned from the wavelength division multiplexer; the first step length is proportional to a channel width of a wavelength channel of the wavelength division multiplexer;
a third determining unit, configured to determine third configuration information according to the third OTDR curve; the third configuration information is a value of the first parameter that causes a wavelength of the optical signal to fall on an edge of the first wavelength channel;
a fourth adjusting unit, configured to adjust the second parameter on the basis of the third configuration information, so that the wavelength of the optical signal changes by a second step length, and a fourth OTDR curve is generated according to a reflected signal returned from the wavelength division multiplexer; the second step length is 1/N of the channel width of the wavelength channel of the wavelength division multiplexer, and N is greater than 1;
a fourth determining unit, configured to determine fourth configuration information according to the fourth OTDR curve; the fourth configuration information is a value of the second parameter that causes a wavelength of the optical signal to fall in a center of the first wavelength channel;
a second alignment unit, configured to use the third configuration information and the fourth configuration information as the wavelength configuration information.
8. The apparatus of claim 5, wherein the alignment module is specifically configured to:
selecting a value of the wavelength control parameter matched with the first wavelength channel from a pre-stored wavelength parameter mapping table, so as to transmit an optical signal to the first wavelength channel from the value of the wavelength control parameter selected from the wavelength parameter mapping table, generating an OTDR curve according to a reflected signal returned from the wavelength division multiplexer, judging whether the wavelength of the optical signal is aligned with the first wavelength channel according to the OTDR curve, and if so, using the value of the wavelength control parameter selected from the wavelength parameter mapping table as the wavelength configuration information.
9. A tuneable laser comprising a wavelength alignment device of the tuneable laser according to any one of claims 5 to 8.
10. An optical network unit comprising a tunable laser according to claim 9.
11. A wavelength division multiplexing passive optical network system comprising an optical network unit according to claim 10.
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| PCT/CN2015/089126 WO2017041224A1 (en) | 2015-09-08 | 2015-09-08 | Adjustable laser wavelength alignment method and device, and related apparatus and system |
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