CN118018141A - Multi-wavelength pulse light delay control device and method based on wavelength division multiplexing - Google Patents
Multi-wavelength pulse light delay control device and method based on wavelength division multiplexing Download PDFInfo
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Abstract
The invention provides a multi-wavelength pulse light delay control device and method based on wavelength division multiplexing, wherein the device comprises the following components: an electro-optic modulator, a first wavelength division multiplexer, a second wavelength division multiplexer and a plurality of delay optical fibers of different lengths. Wherein the electro-optic modulator may modulate the coupled light into coupled pulsed light. The first wavelength division multiplexer can output the pulse light with a plurality of different wavelengths in the coupled pulse light through the transmission channel corresponding to the working wave band in the output port, and the pulse light is transmitted to the transmission channel corresponding to the working wave band in the output port of the second wavelength division multiplexer through the delay optical fiber corresponding to the transmission channel. The second wavelength division multiplexer can couple the delayed pulses with different wavelengths into multi-wavelength delayed pulse light and output the multi-wavelength delayed pulse light through a common port. The device simple structure need not complicated electrical equipment, can realize the accurate control of time delay between the different wavelength pulse light through setting up the length of delay optic fibre to can realize pulse light time delay control convenient, high-efficient.
Description
Technical Field
The invention relates to the technical field of optical fiber sensing, in particular to a device and a method for controlling multi-wavelength pulse light delay based on wavelength division multiplexing.
Background
The distributed optical fiber sensing technology takes optical fibers as sensing media and signal transmission channels, has the excellent performances of long-distance, distributed and continuous measurement, combines the characteristics of intrinsic safety, electromagnetic interference resistance, explosion prevention, corrosion prevention and the like, and has wide application prospects in the fields of communication, electric power, petrifaction, traffic and the like. Currently, the distributed optical fiber sensing technology can be classified into a time domain technology, a frequency domain technology, a coherent domain technology, a polarization domain technology, and the like according to a detection means. Of these, time domain techniques are most mature and most widely used, such as optical time-domain reflectometer (OTDR), brillouin optical time domain reflectometry (brillouin optic time domain reflectometer, BOTDR) and raman optical time domain reflectometry (raman optical time-domain reflectometer, ROTDR). These time-domain distributed optical fiber sensing technologies all need to inject pulse light into a sensing optical fiber, measure backward scattered light in the process of transmitting the pulse light along the optical fiber, and use the change of scattered light intensity, phase or frequency to perform sensing. At the same time, spatial localization is performed with the time the reflected light reaches the detector.
However, in making multiparameter measurements, or more complex distributed fiber optic sensing systems, it is often necessary to use multiple beams of pulsed light injected into the sensing fiber. If the delay between the pulse lights cannot be accurately controlled, the required signal cannot be accurately detected, which limits the development of distributed optical fiber sensing technology to a certain extent.
In the related art, a double pulse modulation technique may be adopted, and brillouin dynamic grating detection is performed. However, the double-pulse modulation technology needs to use pulse generating equipment to output two paths of electric pulses, the time delay between the two paths of electric pulses is controlled by the pulse generating equipment, the system structure is complex, the pulse generating equipment is high in price and high in cost, and the practical engineering application is not facilitated. Thus, pulse light delay control cannot be realized conveniently and efficiently.
Disclosure of Invention
The invention aims to solve the technical problem that the conventional related technology cannot conveniently and efficiently realize pulse light delay control.
In order to solve the technical problems, the invention provides a multi-wavelength pulse light delay control device and a method based on wavelength division multiplexing. The technical scheme is as follows:
In a first aspect, the present invention provides a wavelength division multiplexing-based multi-wavelength pulse light delay control device, including: an electro-optic modulator, a first wavelength division multiplexer, a second wavelength division multiplexer and a plurality of delay optical fibers of different lengths. Wherein the first wavelength division multiplexer and the second wavelength division multiplexer respectively comprise: the public port and the output port, the output port includes a plurality of transmission channels, the plurality of transmission channels correspond to different working wave bands respectively; the electro-optical modulator is connected with a public port of the first wavelength division multiplexer, the output port of the first wavelength division multiplexer is connected with transmission channels of the same working wave band in the output port of the second wavelength division multiplexer through delay optical fibers, and the transmission channels of different working wave bands correspond to the delay optical fibers with different lengths. And the electro-optical modulator is used for receiving the coupled light, modulating the coupled light into coupled pulse light and transmitting the coupled pulse light to a common port of the first wavelength division multiplexer, wherein the coupled light is obtained by continuous optical combination of a plurality of different wavelengths. The first wavelength division multiplexer is used for receiving the coupled pulse light, outputting the pulse light with a plurality of different wavelengths in the coupled pulse light through the transmission channels of the corresponding working wave bands in the output ports, and transmitting the pulse light to the transmission channels of the corresponding working wave bands in the output ports of the second wavelength division multiplexer through the delay optical fibers corresponding to the transmission channels. The second wavelength division multiplexer is used for receiving the delayed pulse light with a plurality of different wavelengths transmitted by the delay optical fiber corresponding to the transmission channel, the delay amount of the delayed pulse light with the plurality of different wavelengths is related to the length of the corresponding delay optical fiber, the delayed pulse light with the plurality of different wavelengths is optically coupled into multi-wavelength delay pulse light, and the multi-wavelength delay pulse light is output through the public port.
In the device, two wavelength division multiplexers and delay optical fibers form precise delay control of pulse light with different wavelengths. The multi-wavelength pulse light delay control device is simple in structure, does not need complex electrical equipment, and can realize accurate control of delay between pulse lights with different wavelengths by setting the length of delay optical fibers connected with each transmission channel, so that the pulse light delay control can be realized conveniently and efficiently.
With reference to the first aspect, in an alternative implementation manner, the apparatus further includes: a plurality of lasers and an optical coupling device. Wherein the plurality of lasers are connected with an optical coupling device, and the optical coupling device is connected with an electro-optical modulator. And the lasers are used for outputting a plurality of continuous lights with different wavelengths and transmitting the continuous lights with different wavelengths to the optical coupling device. And the optical coupling device is used for optically coupling the received continuous light with a plurality of different wavelengths into coupled light and transmitting the coupled light to the electro-optical modulator.
With reference to the first aspect, in an alternative implementation manner, the expression of the delay amount of the delayed pulse light with multiple different wavelengths is:
where t is the delay amount, n is the refractive index of the fiber, L is the length of the corresponding delay fiber, and c is the speed of light in vacuum.
With reference to the first aspect, in an alternative implementation manner, the first wavelength division multiplexer is a dense wavelength division multiplexer, and/or the second wavelength division multiplexer is a dense wavelength division multiplexer. The dense wavelength division multiplexer has the advantages of multiple transmission channels and fast switching. In this way, the efficiency of the pulse light delay control can be improved.
With reference to the first aspect, in an alternative implementation manner, the electro-optical modulator includes: a semiconductor optical amplifier. Thus, the electro-optical modulator can be made to realize modulation of the pulse light by the semiconductor optical amplifier.
With reference to the first aspect, in an alternative implementation manner, the electro-optical modulator includes: an acousto-optic modulator. Thus, the electro-optical modulator can be modulated by the acousto-optic modulator.
With reference to the first aspect, in an optional implementation manner, the optical coupling device includes: a1×n fiber coupler, N being the same number as the plurality of lasers. In this way, it is possible to realize continuous optical coupling of a plurality of different wavelengths emitted by a plurality of lasers into coupled light.
With reference to the first aspect, in an optional implementation manner, the optical coupling device is: dense wavelength division multiplexers or optocouplers.
In a second aspect, the present invention provides a wavelength division multiplexing-based multi-wavelength pulse light delay control method, which may be applied to a multi-wavelength pulse light delay control device, the multi-wavelength pulse light delay control device including: an electro-optic modulator, a first wavelength division multiplexer, a second wavelength division multiplexer and a plurality of delay optical fibers having different lengths; wherein the first wavelength division multiplexer and the second wavelength division multiplexer respectively comprise: the public port and the output port, the output port includes a plurality of transmission channels, the plurality of transmission channels correspond to different working wave bands respectively; the electro-optical modulator is connected with a public port of the first wavelength division multiplexer, the output port of the first wavelength division multiplexer is connected with transmission channels of the same working wave band in the output port of the second wavelength division multiplexer through delay optical fibers, and the transmission channels of different working wave bands correspond to the delay optical fibers with different lengths. The method comprises the following steps: the electro-optical modulator receives the coupled light, modulates the coupled light into coupled pulse light, and transmits the coupled pulse light to a common port of the first wavelength division multiplexer, wherein the coupled light is obtained by combining a plurality of continuous light with different wavelengths, the first wavelength division multiplexer receives the coupled pulse light, outputs the pulse light with different wavelengths in the coupled pulse light through a transmission channel corresponding to an operating band in an output port, and transmits the pulse light to a transmission channel corresponding to the operating band in an output port of the second wavelength division multiplexer through a delay optical fiber corresponding to the transmission channel. The second wavelength division multiplexer receives the delayed pulse light with different wavelengths transmitted by the delay optical fiber corresponding to the transmission channel, the delay amount of the delayed pulse light with different wavelengths is related to the length of the corresponding delay optical fiber, the delayed pulse light with different wavelengths is optically coupled into multi-wavelength delayed pulse light, and the multi-wavelength delayed pulse light is output through the public port.
With reference to the second aspect, in an optional implementation manner, the multi-wavelength pulse light delay control device further includes: a plurality of lasers and an optical coupling device; wherein the plurality of lasers are connected with an optical coupling device, and the optical coupling device is connected with an electro-optical modulator. The method further comprises: the plurality of lasers output a plurality of different wavelengths of continuous light and transmit the plurality of different wavelengths of continuous light to the optical coupling device. The optical coupling device optically couples the received plurality of successive light wavelengths into coupled light and transmits the coupled light to the electro-optical modulator.
It may be appreciated that the beneficial effects achieved by the wavelength division multiplexing-based multi-wavelength pulse optical delay control method of the second aspect may refer to the beneficial effects of the first aspect and any possible implementation manners thereof, and are not described herein.
Drawings
Fig. 1 is a schematic structural diagram of a wavelength division multiplexing-based multi-wavelength pulse optical delay control device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a time sequence of a multi-wavelength delayed pulse light according to an embodiment of the present invention;
Fig. 3 is a schematic structural diagram II of a wavelength division multiplexing-based multi-wavelength pulse optical delay control device according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a wavelength division multiplexing-based multi-wavelength pulse light delay control method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the invention. Merely exemplary of systems and methods consistent with aspects of the invention as set forth in the claims.
The distributed optical fiber sensing technology takes optical fibers as sensing media and signal transmission channels, has the excellent performances of long-distance, distributed and continuous measurement, combines the characteristics of intrinsic safety, electromagnetic interference resistance, explosion prevention, corrosion prevention and the like, and has wide application prospects in the fields of communication, electric power, petrifaction, traffic and the like. Currently, the distributed optical fiber sensing technology can be classified into a time domain technology, a frequency domain technology, a coherent domain technology, a polarization domain technology, and the like according to a detection means. Of these, the time domain techniques are most mature and most widely used, such as optical time domain reflectometry, OTDR, brillouin optical time domain reflectometry, BOTDR, and raman optical time domain reflectometry ROTDR. These time-domain distributed optical fiber sensing technologies all need to inject pulse light into a sensing optical fiber, measure backward scattered light in the process of transmitting the pulse light along the optical fiber, and use the change of scattered light intensity, phase or frequency to perform sensing. At the same time, spatial localization is performed with the time the reflected light reaches the detector.
However, in making multiparameter measurements, or more complex distributed fiber optic sensing systems, it is often necessary to use multiple beams of pulsed light injected into the sensing fiber. If the delay between the pulse lights cannot be accurately controlled, the required signal cannot be accurately detected, which limits the development of distributed optical fiber sensing technology to a certain extent.
In the related art, a double pulse modulation technique may be adopted, and brillouin dynamic grating detection is performed. However, the double-pulse modulation technology needs to use pulse generating equipment to output two paths of electric pulses, the time delay between the two paths of electric pulses is controlled by the pulse generating equipment, the system structure is complex, the pulse generating equipment is high in price and high in cost, and the practical engineering application is not facilitated. Thus, pulse light delay control cannot be realized conveniently and efficiently.
In order to solve the above problems, the embodiment of the invention provides a device and a method for controlling multi-wavelength pulse light delay based on wavelength division multiplexing. Specifically, the device comprises two wavelength division multiplexers, a transmission channel between the two wavelength division multiplexers is connected through a plurality of delay optical fibers with different lengths, pulse light passes through each delay optical fiber to obtain different delays, and finally the wavelength division multiplexer outputs multi-wavelength delay pulse light with each wavelength pulse light separated on a time axis. The multi-wavelength pulse light delay control device is simple in structure, does not need complex electrical equipment, and can realize accurate control of delay between pulse lights with different wavelengths by setting the length of delay optical fibers connected with each transmission channel, so that the pulse light delay control can be realized conveniently and efficiently.
The following describes a scheme provided by an embodiment of the present invention with reference to the accompanying drawings.
Specifically, fig. 1 is a schematic structural diagram of a wavelength division multiplexing-based multi-wavelength pulse light delay control device according to an embodiment of the present invention, as shown in fig. 1, the wavelength division multiplexing-based multi-wavelength pulse light delay control device includes: an electro-optic modulator, a first wavelength division multiplexer, a second wavelength division multiplexer and a plurality of delay optical fibers of different lengths.
Wherein the first wavelength division multiplexer and the second wavelength division multiplexer respectively comprise: the public port and the output port, the output port includes a plurality of transmission channels, the plurality of transmission channels correspond to different working wave bands respectively; the electro-optical modulator is connected with a public port of the first wavelength division multiplexer, the output port of the first wavelength division multiplexer is connected with transmission channels of the same working wave band in the output port of the second wavelength division multiplexer through delay optical fibers, and the transmission channels of different working wave bands correspond to the delay optical fibers with different lengths.
Specifically, the electro-optical modulator is configured to receive the coupled light, modulate the coupled light into coupled pulsed light, and transmit the coupled pulsed light to a common port of the first wavelength division multiplexer. Illustratively, the electro-optic modulator may modulate the coupled light into coupled pulsed light by an electrical pulse. Wherein the coupled light is obtained by successive optical combining of a plurality of different wavelengths.
The first wavelength division multiplexer is used for receiving the coupled pulse light, outputting the pulse light with a plurality of different wavelengths in the coupled pulse light through the transmission channels of the corresponding working wave bands in the output ports, and transmitting the pulse light to the transmission channels of the corresponding working wave bands in the output ports of the second wavelength division multiplexer through the delay optical fibers corresponding to the transmission channels.
The second wavelength division multiplexer is used for receiving the delayed pulse light with a plurality of different wavelengths transmitted by the delay optical fiber corresponding to the transmission channel, the delay amount of the delayed pulse light with the plurality of different wavelengths is related to the length of the corresponding delay optical fiber, the delayed pulse light with the plurality of different wavelengths is optically coupled into multi-wavelength delay pulse light, and the multi-wavelength delay pulse light is output through the public port.
Exemplary, fig. 2 is a schematic time sequence diagram of a multi-wavelength delay pulse light provided by the embodiment of the present invention, and as shown in fig. 2, the multi-wavelength delay pulse light effectively delays the pulse light with different wavelengths, thereby realizing timing control of the pulse light with different wavelengths. In addition, the precision of pulse light delay control is determined by the delay optical fiber, and in the application scene of some embodiments, the delay precision is better than 0.05ns, so that the requirement of a distributed optical fiber sensing system on the pulse light precision delay can be met.
By adopting the multi-wavelength pulse light delay control device based on wavelength division multiplexing provided by the embodiment of the invention, the two wavelength division multiplexers and the delay optical fiber form the precise delay control of different wavelength pulse lights. The multi-wavelength pulse light delay control device is simple in structure, does not need complex electrical equipment, and can realize accurate control of delay between pulse lights with different wavelengths by setting the length of delay optical fibers connected with each transmission channel, so that the pulse light delay control can be realized conveniently and efficiently.
In some embodiments, the delay amount of the delayed pulse light with different wavelengths is expressed as follows:
where t is the delay amount, n is the refractive index of the fiber, L is the length of the corresponding delay fiber, and c is the speed of light in vacuum.
In the embodiment of the present invention, the length of each of the plurality of delay optical fibers with different lengths may be set according to the actual delay amount requirement, which is not particularly limited in the present invention.
In some embodiments, as shown in fig. 1, the wavelength division multiplexing-based multi-wavelength pulse optical delay control device further includes: a plurality of lasers and an optical coupling device. Wherein the plurality of lasers are connected with an optical coupling device, and the optical coupling device is connected with an electro-optical modulator.
Specifically, the plurality of lasers are configured to output a plurality of continuous lights of different wavelengths and to transmit the plurality of continuous lights of different wavelengths to the optical coupling device.
And the optical coupling device is used for optically coupling the received continuous light with a plurality of different wavelengths into coupled light and transmitting the coupled light to the electro-optical modulator.
In some embodiments, the first wavelength division multiplexer is a dense wavelength division multiplexer, and/or the second wavelength division multiplexer is a dense wavelength division multiplexer. The dense wavelength division multiplexer has the advantages of multiple transmission channels and fast switching, so that the efficiency of pulse light delay control can be improved.
In some embodiments, the electro-optic modulator may include: a semiconductor optical amplifier (semiconductor optical amplifier, SOA). The semiconductor optical amplifier has the characteristics of simple structure, small volume, mature manufacturing process, low cost, long service life and small power consumption, can fully utilize the existing semiconductor laser technology, and is convenient to integrate with other optical devices, and the semiconductor optical amplifier can realize the modulation of pulse light.
In some embodiments, the electro-optic modulator may further include: an acousto-optic modulator (acousto-optical modulator, AOM). The acousto-optic modulator can load information on an optical frequency carrier wave, specifically, a modulation signal acts on the transducer in the form of an electric signal (amplitude modulation) and then is converted into a mechanical wave field which changes in the form of an electric signal, and when the optical wave passes through a medium, the optical carrier wave is modulated due to the action to become an intensity modulation wave carrying the information. In this way, modulation of the pulsed light can be achieved by the acousto-optic modulator.
In some embodiments, the optical coupling device includes: a1×n fiber coupler, N being the same number as the plurality of lasers. In this way, it is possible to realize continuous optical coupling of a plurality of different wavelengths emitted by a plurality of lasers into coupled light.
In some embodiments, the optical coupling device is: dense wavelength division multiplexers or optocouplers. In particular, in the case where the number of lasers is small, continuous light can be combined into coupled light by an optical coupler. In the case of a large number of lasers, successive light can be combined into coupled light by means of a dense wavelength division multiplexer.
In some embodiments, the multi-wavelength pulse optical delay control apparatus may include a plurality of electro-optic modulators, and a first wavelength division multiplexer and a second wavelength division multiplexer associated with each electro-optic modulator. Therefore, a plurality of groups of pulse light groups with different wavelengths, different pulse widths and different delays can be formed, different requirements of the distributed optical fiber sensing system on the pulse light delays can be met, and the efficiency of pulse light delay control is improved.
Fig. 3 is a schematic structural diagram of a wavelength division multiplexing-based multi-wavelength pulse optical delay control device according to a second embodiment of the present invention, where, as shown in fig. 3, the multi-wavelength pulse optical delay control device includes: two electro-optic modulators (i.e., electro-optic modulator a and electro-optic modulator B). One end of the electro-optical modulator a is connected with the optical coupling device, and the other end of the electro-optical modulator a is sequentially connected with a first wavelength division multiplexer a, a plurality of delay optical fibers a (delay optical fiber A1, delay optical fibers A2, …, delay optical fibers An,) and a second wavelength division multiplexer a. One end of the electro-optical modulator B is connected with an optical coupling device, and the other end of the electro-optical modulator B is sequentially connected with a first wavelength division multiplexer B, a plurality of delay optical fibers B (delay optical fibers B1, delay optical fibers B2, … and delay optical fibers Bn) and a second wavelength division multiplexer B.
In this way, two groups of pulse light groups with different wavelengths, different pulse widths and different delays can be output through the electro-optical modulator A and the electro-optical modulator B and the delay optical fibers A and B with different lengths so as to meet different application requirements.
In some embodiments, the embodiments of the present invention further provide a wavelength division multiplexing-based multi-wavelength pulse optical delay control method, which may be applied to the above-mentioned multi-wavelength pulse optical delay control device. Specifically, the multi-wavelength pulse light delay control device comprises: an electro-optic modulator, a first wavelength division multiplexer, a second wavelength division multiplexer and a plurality of delay optical fibers having different lengths; wherein the first wavelength division multiplexer and the second wavelength division multiplexer respectively comprise: the public port and the output port, the output port includes a plurality of transmission channels, the plurality of transmission channels correspond to different working wave bands respectively; the electro-optical modulator is connected with a public port of the first wavelength division multiplexer, the output port of the first wavelength division multiplexer is connected with transmission channels of the same working wave band in the output port of the second wavelength division multiplexer through delay optical fibers, and the transmission channels of different working wave bands correspond to the delay optical fibers with different lengths.
Fig. 4 is a schematic flow chart of a wavelength division multiplexing-based multi-wavelength pulse light delay control method according to an embodiment of the present invention, as shown in fig. 4, the method includes the following steps S101 to S103:
S101, an electro-optical modulator receives coupling light, modulates the coupling light into coupling pulse light, and transmits the coupling pulse light to a common port of a first wavelength division multiplexer, wherein the coupling light is obtained by continuous optical multiplexing of a plurality of different wavelengths.
S102, the first wavelength division multiplexer receives the coupled pulse light, outputs the pulse light with different wavelengths in the coupled pulse light through the transmission channels of the corresponding working wave bands in the output ports, and transmits the pulse light to the transmission channels of the corresponding working wave bands in the output ports of the second wavelength division multiplexer through the delay optical fibers corresponding to the transmission channels.
S103, the second wavelength division multiplexer receives the delayed pulse light with different wavelengths transmitted by the delay optical fiber corresponding to the transmission channel, the delay amount of the delayed pulse light with different wavelengths is associated with the length of the corresponding delay optical fiber, the delayed pulse light with different wavelengths is optically coupled into multi-wavelength delayed pulse light, and the multi-wavelength delayed pulse light is output through the public port.
In some embodiments, the multi-wavelength pulsed light delay control apparatus further comprises: a plurality of lasers and an optical coupling device; wherein the plurality of lasers are connected with an optical coupling device, and the optical coupling device is connected with an electro-optical modulator.
The method for controlling the delay of the multi-wavelength pulse light based on wavelength division multiplexing provided by the embodiment of the invention further comprises the following steps before the step S101:
S104, the lasers output a plurality of continuous lights with different wavelengths and transmit the continuous lights with different wavelengths to the optical coupling device.
S105, the optical coupling device is used for combining the received continuous light with a plurality of different wavelengths into coupled light and transmitting the coupled light to the electro-optical modulator.
By adopting the multi-wavelength pulse light delay control method based on wavelength division multiplexing provided by the embodiment of the invention, the accurate control of the delay among the pulse lights with different wavelengths can be realized, so that the pulse light delay control can be realized conveniently and efficiently.
It will be apparent to those skilled in the art from this description that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The above-provided detailed description is merely a few examples under the general inventive concept and does not limit the scope of the present invention. Any other embodiments which are extended according to the solution of the invention without inventive effort fall within the scope of protection of the invention for a person skilled in the art.
Claims (10)
1. A wavelength division multiplexing-based multi-wavelength pulse light delay control device, the device comprising: an electro-optic modulator, a first wavelength division multiplexer, a second wavelength division multiplexer and a plurality of delay optical fibers having different lengths;
wherein the first wavelength division multiplexer and the second wavelength division multiplexer each include: the system comprises a public port and an output port, wherein the output port comprises a plurality of transmission channels, and the transmission channels respectively correspond to different working wave bands; the electro-optical modulator is connected with a public port of the first wavelength division multiplexer, the output port of the first wavelength division multiplexer is connected with transmission channels of the same working wave band in the output port of the second wavelength division multiplexer through the delay optical fibers, and the transmission channels of different working wave bands correspond to the delay optical fibers with different lengths;
the electro-optical modulator is used for receiving the coupled light, modulating the coupled light into coupled pulse light, and transmitting the coupled pulse light to a common port of the first wavelength division multiplexer, wherein the coupled light is obtained by combining a plurality of continuous light with different wavelengths;
the first wavelength division multiplexer is used for receiving the coupled pulse light, outputting the pulse light with a plurality of different wavelengths in the coupled pulse light through a transmission channel with a corresponding working wave band in an output port, and transmitting the pulse light to the transmission channel with the corresponding working wave band in the output port of the second wavelength division multiplexer through a delay optical fiber corresponding to the transmission channel;
the second wavelength division multiplexer is configured to receive the delayed multiple pulse lights transmitted through the delay optical fiber corresponding to the transmission channel, wherein delay amounts of the delayed multiple pulse lights with different wavelengths are associated with lengths of the corresponding delay optical fibers, couple the delayed multiple pulse lights with different wavelengths into multi-wavelength delayed pulse lights, and output the multi-wavelength delayed pulse lights through a common port.
2. The apparatus of claim 1, wherein the apparatus further comprises: a plurality of lasers and an optical coupling device;
wherein the plurality of lasers are connected with the optical coupling device, and the optical coupling device is connected with the electro-optical modulator;
The lasers are used for outputting a plurality of continuous lights with different wavelengths and transmitting the continuous lights with different wavelengths to the optical coupling device;
the optical coupling device is used for optically coupling the received continuous light with the plurality of different wavelengths into the coupled light and transmitting the coupled light to the electro-optical modulator.
3. The apparatus of claim 1, wherein the delay amount of the delayed plurality of pulsed light of different wavelengths is expressed as:
where t is the delay amount, n is the refractive index of the fiber, L is the length of the corresponding delay fiber, and c is the speed of light in vacuum.
4. The apparatus of claim 1, wherein the first wavelength division multiplexer is a dense wavelength division multiplexer and/or the second wavelength division multiplexer is a dense wavelength division multiplexer.
5. The apparatus of claim 1, wherein the electro-optic modulator comprises: a semiconductor optical amplifier.
6. The apparatus of claim 1, wherein the electro-optic modulator comprises: an acousto-optic modulator.
7. The apparatus of claim 2, wherein the optical coupling means comprises: a1×n fiber coupler, the N being the same number as the plurality of lasers.
8. The apparatus of claim 2, wherein the optical coupling means is: dense wavelength division multiplexers or optocouplers.
9. The method is characterized by being applied to a multi-wavelength pulse light delay control device, wherein the multi-wavelength pulse light delay control device comprises the following steps: an electro-optic modulator, a first wavelength division multiplexer, a second wavelength division multiplexer and a plurality of delay optical fibers having different lengths; wherein the first wavelength division multiplexer and the second wavelength division multiplexer each include: the system comprises a public port and an output port, wherein the output port comprises a plurality of transmission channels, and the transmission channels respectively correspond to different working wave bands; the electro-optical modulator is connected with a public port of the first wavelength division multiplexer, the output port of the first wavelength division multiplexer is connected with transmission channels of the same working wave band in the output port of the second wavelength division multiplexer through the delay optical fibers, and the transmission channels of different working wave bands correspond to the delay optical fibers with different lengths;
The method comprises the following steps:
the electro-optical modulator receives coupled light, modulates the coupled light into coupled pulse light, and transmits the coupled pulse light to a common port of the first wavelength division multiplexer, wherein the coupled light is obtained by a plurality of continuous optical synthesis of different wavelengths;
The first wavelength division multiplexer receives the coupled pulse light, outputs pulse light with a plurality of different wavelengths in the coupled pulse light through a transmission channel corresponding to a working wave band in an output port, and transmits the pulse light to the transmission channel corresponding to the working wave band in the output port of the second wavelength division multiplexer through a delay optical fiber corresponding to the transmission channel;
The second wavelength division multiplexer receives the delayed pulse light with different wavelengths transmitted by the delay optical fiber corresponding to the transmission channel, the delay amount of the delayed pulse light with different wavelengths is related to the length of the corresponding delay optical fiber, the delayed pulse light with different wavelengths is optically coupled into multi-wavelength delayed pulse light, and the multi-wavelength delayed pulse light is output through a public port.
10. The method of claim 9, wherein the multi-wavelength pulsed light delay control device further comprises: a plurality of lasers and an optical coupling device; wherein the plurality of lasers are connected with the optical coupling device, and the optical coupling device is connected with the electro-optical modulator;
the method further comprises the steps of:
The lasers output a plurality of continuous lights with different wavelengths and transmit the continuous lights with different wavelengths to the optical coupling device;
the optical coupling device optically couples the received plurality of successive light wavelengths into the coupled light and transmits the coupled light to the electro-optic modulator.
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