CN111697424A - Light source generating device, method, equipment and computer readable storage medium - Google Patents
Light source generating device, method, equipment and computer readable storage medium Download PDFInfo
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- CN111697424A CN111697424A CN201910184762.4A CN201910184762A CN111697424A CN 111697424 A CN111697424 A CN 111697424A CN 201910184762 A CN201910184762 A CN 201910184762A CN 111697424 A CN111697424 A CN 111697424A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10053—Phase control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
Abstract
The invention discloses a light source generating device, a light source generating method, light source generating equipment and a computer readable storage medium, relates to the technical field of optical communication, and aims to solve the problems of low coherence and poor stability of a super-continuum spectrum generated by the prior art. The light source generating device comprises: the system comprises a homologous multi-pulse generation module and a super-continuum spectrum generation module; the homologous multi-pulse generation module is used for generating a plurality of paths of light pulses based on the laser signals of the same laser; and the supercontinuum generation module is used for generating a supercontinuum multi-wavelength light source based on the multi-path light pulse. The supercontinuum multi-wavelength light source generated by the scheme of the embodiment of the invention has higher coherence and stability.
Description
Technical Field
The present invention relates to the field of optical communication technologies, and in particular, to a light source generating device, method, apparatus, and computer-readable storage medium.
Background
A typical Ultra Dense Wavelength Division Multiplexing (UDWDM) Optical transmission system is mainly composed of an Optical Transmit Unit (OTU), an Optical Multiplexer (MUX)/Demultiplexer (DEMUX) Unit, an Optical Amplifier (OA), and the like. Compared with the wavelength channel spacing of 50GHz or 100GHz in a traditional Dense Wavelength Division Multiplexing (DWDM) system, the UDWDM optical transmission system can adopt the wavelength channel spacing of 12.5GHz, 6.25GHz and the like with smaller bandwidth spacing. UDWDM increases the capacity of an optical fiber by compressing the channel spacing and increasing the number of channels. However, the increase in the number of channels leads to problems of increased volume, power consumption, cost, and the like. Therefore, UDWDM optical transmission systems need to incorporate a multi-wavelength optical source.
At present, the multi-wavelength light source mainly includes implementation modes such as a laser array, an optical frequency comb, a super-continuum spectrum cutting and the like.
The supercontinuum refers to the phenomenon that after high-power ultrashort optical pulses are injected into a nonlinear optical medium, the spectral width of output pulses is far larger than that of incident pulses under the action of a nonlinear effect. Spectral lines with good coherence, high flatness and low noise in the supercontinuum are selected as the multi-wavelength light source.
One solution for supercontinuum generation is based on dual wavelength ultrashort optical pulses or direct current optical pumping of the nonlinear medium. This approach can lead to a significant increase in supercontinuum width. However, the supercontinuum generated by this method has low coherence and poor stability, and cannot be applied to the field of optical communication.
Disclosure of Invention
Embodiments of the present invention provide a light source generating apparatus, a light source generating method, a light source generating device, and a computer-readable storage medium, so as to solve the problems of low coherence and poor stability of a super-continuum spectrum generated by using the prior art.
In a first aspect, an embodiment of the present invention provides a light source generating apparatus, including: the system comprises a homologous multi-pulse generation module and a super-continuum spectrum generation module;
the homologous multi-pulse generation module is used for generating a plurality of paths of light pulses based on the laser signals of the same laser;
and the supercontinuum generation module is used for generating a supercontinuum multi-wavelength light source based on the multi-path light pulse.
Wherein the homologous multi-pulse generating module comprises: the device comprises a laser, a phase modulation unit, a microwave source and a multi-path pulse generation unit;
the laser is used for generating continuous direct current light;
the microwave source is used for generating a microwave signal and driving the phase modulation unit by using the microwave signal;
the phase modulation unit is used for performing phase modulation on the direct current light under the driving of the microwave source;
and the multipath pulse generating unit is used for performing spectrum cutting on the optical signal after phase modulation to generate multipath optical pulses.
Wherein the homologous multi-pulse generating module further comprises: a pulse time domain calibration unit;
and the pulse time domain calibration unit is used for adjusting the relative position of the multipath light pulses on the time domain.
Wherein the supercontinuum generating module comprises: optical amplifiers and highly nonlinear media;
the optical amplifier is used for amplifying the multi-path optical pulses output by the pulse time domain calibration unit;
the high nonlinear medium is used for generating a supercontinuum multi-wavelength light source based on the amplified multiple optical pulses.
In a second aspect, an embodiment of the present invention provides a light source generating method, which is applied to the light source generating apparatus in the first aspect, and includes:
generating multiple paths of light pulses based on laser signals of the same laser;
and generating a supercontinuum multi-wavelength light source based on the multiple optical pulses.
Wherein, the laser signal based on the same laser generates multiple optical pulses, including:
generating continuous direct current light by using a laser;
generating a microwave signal by using a microwave source, and driving the phase modulation unit by using the microwave signal;
under the drive of the microwave source, the direct current light is subjected to phase modulation;
and performing spectrum cutting on the optical signal after phase modulation to generate a plurality of paths of optical pulses.
Wherein the method further comprises:
and adjusting the relative position of the multipath light pulses in the time domain.
Wherein said generating a supercontinuum multi-wavelength light source based on said plurality of optical pulses comprises:
amplifying the multipath light pulses with the relative positions in the time domain adjusted;
and generating the supercontinuum multi-wavelength light source based on the amplified multiple optical pulses.
In a third aspect, an embodiment of the present invention provides a communication device, including: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor;
the processor is configured to read the program in the memory to implement the steps of the method according to the second aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium for storing a computer program, which when executed by a processor implements the steps in the method according to the first aspect.
In the embodiment of the invention, multiple paths of pulses are generated based on laser signals generated by the same laser, and the multiple paths of pulses are used for generating the supercontinuum multi-wavelength light source. Because multiple paths of pulses are generated in the same laser, compared with the prior art, the supercontinuum multi-wavelength light source generated by the scheme of the embodiment of the invention has higher coherence and stability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a block diagram of a light source generating device according to an embodiment of the present invention;
FIG. 2 is a block diagram of a module for generating multiple pulses according to the embodiment of the present invention;
FIG. 3 is a second block diagram of a homologous multi-pulse generating module according to an embodiment of the present invention;
FIG. 4 is a block diagram of a supercontinuum generation module provided by an embodiment of the present invention;
FIG. 5 is a second block diagram of a light source generating device according to an embodiment of the present invention;
FIG. 6 is a flow chart of a method for generating a light source according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a communication device provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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.
Because the dual-wavelength pulse or the direct current in the prior art is respectively emitted by different lasers, the supercontinuum generated by the method has low coherence and poor stability, and cannot be applied to the field of optical communication. In order to solve the above problems, embodiments of the present invention provide a method for efficiently generating a supercontinuum based on a homologous multi-pulse pumping nonlinear medium to excite nonlinear effects such as cross-phase modulation and four-wave mixing. Because a plurality of optical pulses for pumping the nonlinear medium are derived from the same laser, the generated supercontinuum has high coherence and stability.
Referring to fig. 1, fig. 1 is a structural diagram of a light source generating device according to an embodiment of the present invention. As shown in fig. 1, includes: a homologous multipulse generation module 11 and a supercontinuum generation module 12.
The homologous multi-pulse generating module 11 is configured to generate multiple paths of optical pulses based on a laser signal of the same laser; the supercontinuum generation module 12 is configured to generate a supercontinuum multi-wavelength light source based on the multiple optical pulses.
According to the nonlinear optical fiber optical principle, when one path of light pulse is transmitted in an optical fiber, the main nonlinear effect is a self-phase modulation effect; when two paths of even multiple paths of light pulses are transmitted in the optical fiber, the main nonlinear effect is not only the self-phase modulation effect, but also the cross-phase modulation effect among the pulses, and the nonlinear phase shift generated by the cross-phase modulation effect is 2 times of that of the self-phase modulation effect, and the four-wave mixing effect is easier to excite, so that the supercontinuum is generated more efficiently.
As shown in fig. 2, the homologous multi-pulse generating module includes: a laser 110, a phase modulation unit 111, a microwave source 112, and a multi-path pulse generation unit 113.
The laser 110 is used for generating continuous direct current light. The microwave source 111 is configured to generate a microwave signal and drive the phase modulation unit 112 with the microwave signal. Wherein the repetition rate of the microwave source determines the frequency interval over which the spectrum is generated. The phase modulation unit 112 is configured to perform phase modulation on the dc light under the driving of the microwave source, broaden a spectrum, and provide an operable spectrum for the subsequent generation of multiple pulses. The multi-path pulse generating unit 113 is configured to perform spectrum slicing on the phase-modulated optical signal to generate a multi-path optical pulse.
In order to excite the nonlinear effect such as cross-phase modulation as much as possible when transmitting in the nonlinear medium, and generate the supercontinuum with high efficiency, as shown in fig. 3, the homologous multipulse generation module may further include: and a pulse time domain calibration unit 114, configured to adjust a relative position of the multiple optical pulses in a time domain. The pulse time domain calibration unit is used for combining multiple paths of light pulses into one path in a time domain, and the efficiency of subsequent pumping of the nonlinear medium can be improved by adjusting the relative time domains among different pulses.
As shown in fig. 4, the supercontinuum generation module 12 includes: an optical amplifier 121 and a highly nonlinear medium 122. The optical amplifier 121 is configured to amplify the multiple optical pulses output by the pulse time domain calibration unit. The amplifier amplifies the optical pulse power to provide sufficient gain. The highly nonlinear medium 122 is used for generating a supercontinuum multi-wavelength light source based on the amplified multiple optical pulses.
As shown in fig. 5, in one embodiment, a laser, a phase modulation unit, a multi-path pulse generation unit, a pulse time domain calibration unit, an optical amplifier and a high non-linear medium are optically connected; the microwave source and the phase modulation unit are electrically connected.
Referring to fig. 5, a laser first generates continuous direct current light, and then injects the continuous direct current light into a phase modulation unit for phase modulation, so as to broaden a spectrum, and further cut the broadened spectrum after phase modulation into N (N is an integer, and N is greater than or equal to 2) parts in a frequency domain, that is, generate N paths of optical pulses. The phase modulation unit is driven by a radio frequency signal emitted by a microwave source.
At the moment, the N paths of optical pulses respectively have different phases, so that the time delay on the time domain is different, and the pulse time domain calibration unit adjusts the relative positions of the N paths of optical pulses on the time domain, so that the nonlinear effect generated when the N paths of optical pulses are transmitted together in a high nonlinear medium is maximized, the requirement on the gain of the optical amplifier is reduced, and the widest spectrum is generated as far as possible.
In the embodiment of the invention, multiple paths of pulses are generated based on laser signals generated by the same laser, and the multiple paths of pulses are used for generating the supercontinuum multi-wavelength light source. Because multiple paths of pulses are generated in the same laser, compared with the prior art, the supercontinuum multi-wavelength light source generated by the scheme of the embodiment of the invention has higher coherence and stability.
In addition, the invention is based on a homologous multi-pulse pumping nonlinear medium, excites nonlinear effects such as cross phase modulation and four-wave mixing, can more efficiently generate a super-continuum spectrum, and reduces the power of an EDFA (Erbium Doped Fiber Amplifier). Meanwhile, a plurality of optical pulses for pumping the nonlinear medium are from the same laser, and the super-continuum spectrum has high coherence, so that a cascade modulator is not needed to expand the spectrum, and the problems of synchronization among a plurality of modulators, cost and the like are not needed to be considered. Therefore, the embodiment of the invention can reduce the production cost of the light source.
As shown in fig. 6, the light source generating method according to the embodiment of the present invention is applied to the light source generating apparatus shown in any one of fig. 1 to 4, and includes:
Specifically, in this step, a laser is used to generate continuous direct current light, a microwave source is used to generate a microwave signal, and the phase modulation unit is driven by the microwave signal. And then, under the drive of the microwave source, performing phase modulation on the direct current light, and finally, performing spectrum cutting on the optical signal subjected to the phase modulation to generate a plurality of paths of optical pulses.
In order to excite nonlinear effects such as cross-phase modulation when transmitting in a nonlinear medium as much as possible, and efficiently generate a supercontinuum, the method further comprises the following steps: and adjusting the relative position of the multipath light pulses in the time domain. The multiple paths of optical pulses are combined into one path in the time domain, and the efficiency of subsequent pumping of the nonlinear medium can be improved by adjusting the relative time domains among different pulses.
And 602, generating a supercontinuum multi-wavelength light source based on the multiple optical pulses.
In this step, the multiple optical pulses whose relative positions in the time domain are adjusted are amplified, and then a supercontinuum multi-wavelength light source is generated based on the amplified multiple optical pulses.
In the embodiment of the invention, multiple paths of pulses are generated based on laser signals generated by the same laser, and the multiple paths of pulses are used for generating the supercontinuum multi-wavelength light source. Because multiple paths of pulses are generated in the same laser, compared with the prior art, the supercontinuum multi-wavelength light source generated by the scheme of the embodiment of the invention has higher coherence and stability.
As shown in fig. 7, the communication device implemented by the present invention includes: the processor 700, which is used to read the program in the memory 720, executes the following processes:
generating multiple paths of light pulses based on laser signals of the same laser;
and generating a supercontinuum multi-wavelength light source based on the multiple optical pulses.
A transceiver 710 for receiving and transmitting data under the control of the processor 700.
Where in fig. 7, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 700 and memory represented by memory 720. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 710 may be a number of elements including a transmitter and a transceiver providing a means for communicating with various other apparatus over a transmission medium. The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.
The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.
The processor 700 is further configured to read the computer program and perform the following steps:
generating continuous direct current light by using a laser;
generating a microwave signal by using a microwave source, and driving the phase modulation unit by using the microwave signal;
under the drive of the microwave source, the direct current light is subjected to phase modulation;
and performing spectrum cutting on the optical signal after phase modulation to generate a plurality of paths of optical pulses.
The processor 700 is further configured to read the computer program and perform the following steps:
and adjusting the relative position of the multipath light pulses in the time domain.
The processor 700 is further configured to read the computer program and perform the following steps:
amplifying the multipath light pulses with the relative positions in the time domain adjusted;
and generating the supercontinuum multi-wavelength light source based on the amplified multiple optical pulses.
Furthermore, a computer-readable storage medium of an embodiment of the present invention stores a computer program executable by a processor to implement:
generating multiple paths of light pulses based on laser signals of the same laser;
and generating a supercontinuum multi-wavelength light source based on the multiple optical pulses.
Wherein, the laser signal based on the same laser generates multiple optical pulses, including:
generating continuous direct current light by using a laser;
generating a microwave signal by using a microwave source, and driving the phase modulation unit by using the microwave signal;
under the drive of the microwave source, the direct current light is subjected to phase modulation;
and performing spectrum cutting on the optical signal after phase modulation to generate a plurality of paths of optical pulses.
Wherein the method further comprises:
and adjusting the relative position of the multipath light pulses in the time domain.
Wherein said generating a supercontinuum multi-wavelength light source based on said plurality of optical pulses comprises:
amplifying the multipath light pulses with the relative positions in the time domain adjusted;
and generating the supercontinuum multi-wavelength light source based on the amplified multiple optical pulses.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the transceiving method according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A light source generating device, comprising: the system comprises a homologous multi-pulse generation module and a super-continuum spectrum generation module;
the homologous multi-pulse generation module is used for generating a plurality of paths of light pulses based on the laser signals of the same laser;
and the supercontinuum generation module is used for generating a supercontinuum multi-wavelength light source based on the multi-path light pulse.
2. The apparatus of claim 1, wherein the homologous multipulse generation module comprises: the device comprises a laser, a phase modulation unit, a microwave source and a multi-path pulse generation unit;
the laser is used for generating continuous direct current light;
the microwave source is used for generating a microwave signal and driving the phase modulation unit by using the microwave signal;
the phase modulation unit is used for performing phase modulation on the direct current light under the driving of the microwave source;
and the multipath pulse generating unit is used for performing spectrum cutting on the optical signal after phase modulation to generate multipath optical pulses.
3. The apparatus of claim 2, wherein the homologous multipulse generation module further comprises: a pulse time domain calibration unit;
and the pulse time domain calibration unit is used for adjusting the relative position of the multipath light pulses on the time domain.
4. The apparatus of claim 3, wherein the supercontinuum generation module comprises: optical amplifiers and highly nonlinear media;
the optical amplifier is used for amplifying the multi-path optical pulses output by the pulse time domain calibration unit;
the high nonlinear medium is used for generating a supercontinuum multi-wavelength light source based on the amplified multiple optical pulses.
5. A light source generating method applied to the light source generating device according to any one of claims 1 to 4, comprising:
generating multiple paths of light pulses based on laser signals of the same laser;
and generating a supercontinuum multi-wavelength light source based on the multiple optical pulses.
6. The method of claim 5, wherein generating multiple optical pulses based on the laser signal of the same laser comprises:
generating continuous direct current light by using a laser;
generating a microwave signal by using a microwave source, and driving the phase modulation unit by using the microwave signal;
under the drive of the microwave source, the direct current light is subjected to phase modulation;
and performing spectrum cutting on the optical signal after phase modulation to generate a plurality of paths of optical pulses.
7. The method of claim 6, further comprising:
and adjusting the relative position of the multipath light pulses in the time domain.
8. The method of claim 7, wherein generating a supercontinuum multi-wavelength light source based on the multiplexed light pulses comprises:
amplifying the multipath light pulses with the relative positions in the time domain adjusted;
and generating the supercontinuum multi-wavelength light source based on the amplified multiple optical pulses.
9. A communication device, comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,
the processor for reading the program in the memory to implement the steps in the method of any one of claims 5 to 8.
10. A computer-readable storage medium for storing a computer program, wherein the computer program, when executed by a processor, implements the steps in the method according to any one of claims 5 to 8.
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