CN113960848A - PSK modulation system and method based on time lens - Google Patents
PSK modulation system and method based on time lens Download PDFInfo
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- CN113960848A CN113960848A CN202111085532.6A CN202111085532A CN113960848A CN 113960848 A CN113960848 A CN 113960848A CN 202111085532 A CN202111085532 A CN 202111085532A CN 113960848 A CN113960848 A CN 113960848A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3536—Four-wave interaction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
Abstract
The invention belongs to the technical field of optical digital modulation, and discloses a time lens-based PSK modulation system and a method, wherein the system comprises a digital baseband signal module, a pump light generation module, a time lens imaging module and a sinusoidal signal generation module; the pump light generation module and the sine signal generation module are respectively connected with the time lens imaging module, and the pump light generation module is also connected with the digital baseband signal module; the digital baseband signal module is used for sending out a digital baseband signal 1 or 0 so as to control the level of the pump light sent to the time lens imaging module by the pump light generation module; the sinusoidal signal generating module is used for continuously generating sinusoidal signal light sent to the time lens imaging module; the pump light and the sinusoidal signal light generate a four-wave mixing effect in the time lens imaging module, and the modulated sinusoidal signal light is output through the time lens imaging module. A simple and reliable PSK modulation mode is realized. The complexity of the system is reduced, and the stability of the system is increased.
Description
Technical Field
The invention belongs to the technical field of optical digital modulation, and particularly relates to a time lens-based PSK modulation system and method.
Background
Optical communication occupies an extremely important position in the current social communication mode due to the characteristic of high bandwidth and large capacity, along with the increasing requirements of people on information rate, the development of the optical communication technology is different day by day, and the optical digital modulation technology utilizes baseband signals to modulate optical carriers, including Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK) and Phase Shift Keying (PSK). PSK signals modulate the phase, transmitting a '0' code and a '1' code, with two different phases (typically 180 degrees apart). Phase Shift Keying (PSK) is widely used in radio communication systems, where the technique is mainly compatible with data communication, allows to transmit information on radio communication signals in a more efficient way than other forms of modulation, allows better data transmission in some specific channels, and is widely used in high speed data transmission.
In the prior art, two methods for generating a PSK signal are a phase modulation method and a selection method, respectively, where the phase modulation method is a method of directly multiplying a baseband digital signal (bipolar) by a carrier signal; the selection method is to use digital baseband signals to select two carriers with phases different by 180 degrees. However, the two methods have very strict requirements on the spectral widths of the transmitting and local oscillator lasers and have high requirements on the process and the technology.
Therefore, a new PSK modulation system is needed to reduce the complexity of the modulation system and simplify the modulation process.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a time lens-based PSK modulation system and method, which realize a simple and reliable PSK modulation mode, reduce the complexity of the system and increase the stability of the system.
The invention adopts the following technical scheme: a PSK modulation system based on a time lens comprises a digital baseband signal module, a pump light generation module, a time lens imaging module and a sinusoidal signal generation module;
the pump light generation module and the sine signal generation module are respectively connected with the time lens imaging module, and the pump light generation module is also connected with the digital baseband signal module;
the digital baseband signal module is used for sending out a digital baseband signal 1 or 0 so as to control the level of the pump light sent to the time lens imaging module by the pump light generation module;
the sinusoidal signal generating module is used for continuously generating sinusoidal signal light sent to the time lens imaging module;
the pump light and the sinusoidal signal light generate a four-wave mixing effect in the time lens imaging module, and the modulated sinusoidal signal light is output through the time lens imaging module.
As a preferred scheme, the time lens imaging module comprises an input section optical fiber, a time lens and an output section optical fiber which are connected in sequence, and further comprises a pump light transmission optical fiber connected with the time lens;
the sinusoidal signal generating module is connected with the time lens through an input section optical fiber, the pump light generating module is connected with the time lens through a pump light transmission optical fiber, and an output section optical fiber is used for outputting modulated sinusoidal signal light.
As a preferred scheme, the second-order dispersion of the input section of the optical fiber is phi ″)1The second-order dispersion of the output section optical fiber is phi ″)2And phi ″)2＝-φ″1。
Preferably, the imaging coefficient M ═ Φ ″' of the time lens imaging module2/φ″1＝-1。
Preferably, the focal length dispersion of the time lens is phi ″)fAnd is and
preferably, the width of the pump light pulse is equal to the width of one-period waveform of the sinusoidal signal light.
As a preferred scheme, the second-order dispersion phi of the input section1＝β2sLsWherein, β2sRepresenting the second-order dispersion coefficient, L, of the input section fibersIndicating the length of the input length of fiber.
As a preferred scheme, the second-order dispersion phi of the output section2＝β2iLiWherein, β2iRepresenting the second-order dispersion coefficient, L, of the output section of the fiberiIndicating the length of the output length of fiber.
Preferably, the focal length dispersion phi' of the time lensf＝-φ″p/2＝-β2pLp/2，β2pIs the second-order dispersion coefficient, L, of the pump light transmission fiberpIs the length of the pump light delivery fiber.
Correspondingly, a PSK modulation method based on time lens is also provided, based on the above PSK modulation system based on time lens, including the steps:
s1, the digital baseband signal module sends out a digital baseband signal 1 or 0 to control the level of the pump light sent to the time lens imaging module by the pump light generation module;
s2, the sinusoidal signal generation module continuously generates sinusoidal signal light sent to the time lens imaging module;
and S3, generating four-wave mixing effect in the time lens imaging module by the pump light and the sinusoidal signal light, and outputting the modulated sinusoidal signal light through the time lens imaging module.
The invention has the beneficial effects that: a novel PSK signal modulation mode is provided, and a PSK signal can be output only by controlling the level of pump light by using a digital baseband signal and modulating sinusoidal signal light by using a time lens imaging module. A simple and reliable PSK modulation mode is realized. The complexity of the system is reduced, and the stability of the system is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a quadratic time phase shift of sinusoidal signal light by a time lens;
fig. 2 is a schematic diagram of a time-lens based PSK modulation system according to the present invention;
FIG. 3 is a schematic diagram of a periodic sinusoidal signal light;
FIG. 4 is a schematic diagram of the optical phase change of a periodic sinusoidal signal by 180 degrees;
FIG. 5 is a schematic diagram of pump light pulses;
FIG. 6 is a schematic diagram of sinusoidal signal light;
FIG. 7 is a diagram of PSK signals output by the pump light of FIG. 5 and the sinusoidal signal light of FIG. 6 after passing through a time lens imager module;
fig. 8 is a flowchart illustrating a PSK modulation method based on time lens according to the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
Referring to fig. 1, the time lens is an optical device capable of generating a secondary time phase shift to an optical signal, and the time lens based on four-wave mixing passes through a sinusoidal signal light Es(t) and pump light Ep(t) four-wave mixing (FWM) effect occurs, resulting in an idle wave electric field amplitude
Idle light EidlerWith respect to the input sinusoidal signal light Es(t) introduces a secondary phase shift, based on which the invention further applies a time lens to the PSK modulation.
Referring to fig. 2, the present embodiment provides a PSK modulation system based on a time lens, including a digital baseband signal module, a pump light generation module, a time lens imaging module, and a sinusoidal signal generation module;
the pump light generation module and the sine signal generation module are respectively connected with the time lens imaging module, and the pump light generation module is also connected with the digital baseband signal module;
the digital baseband signal module is used for sending out a digital baseband signal 1 or 0 so as to control the level of the pump light sent to the time lens imaging module by the pump light generation module;
the sinusoidal signal generating module is used for continuously generating sinusoidal signal light sent to the time lens imaging module;
the pump light and the sinusoidal signal light generate a four-wave mixing effect in the time lens imaging module, and the modulated sinusoidal signal light is output through the time lens imaging module.
In this embodiment, a novel PSK signal modulation method is provided, and only the digital baseband signal is used to control the level of the pump light, and then the time lens imaging module modulates the sinusoidal signal light, so as to output a PSK signal. A simple and reliable PSK modulation mode is realized. The complexity of the system is reduced, and the stability of the system is increased.
Specifically, the method comprises the following steps:
the time lens imaging module comprises an input section optical fiber, a time lens and an output section optical fiber which are connected in sequence, and also comprises a pump light transmission optical fiber connected with the time lens;
the sinusoidal signal generating module is connected with the time lens through an input section optical fiber, the pump light generating module is connected with the time lens through a pump light transmission optical fiber, and an output section optical fiber is used for outputting modulated sinusoidal signal light.
And a high nonlinear medium is arranged in the time lens, so that the pumping light and the sinusoidal signal light generate a four-wave mixing (FWM) effect in the high nonlinear medium. In this embodiment, the high nonlinear medium is a high nonlinear optical fiber.
The second-order dispersion of the input section optical fiber is phi1The second-order dispersion of the output section optical fiber is phi ″)2And phi ″)2＝-φ″1. I.e. the imaging coefficient M phi of the time lens imaging module2/φ″1Is-1. The width of the pump light pulse is controlled to be equal to the width of one period waveform of the sinusoidal signal light. The sinusoidal signal light can realize time domain inversion, that is, change of phase by 180 degrees, as shown in fig. 3 and 4.
The focal length dispersion of the time lens is phifAnd satisfy the conditions
In this case, amplification or compression of the input sinusoidal signal light can be achieved, where the multiple is M ═ phi ″2/φ″1＝-1。
And, more specifically:
input segment second-order dispersion phi1＝β2sLsWherein, β2sRepresenting the second-order dispersion coefficient, L, of the input section fibersIndicating the length of the input length of fiber.
Second-order dispersion phi of output section2＝β2iLiWherein, β2iRepresenting the second-order dispersion coefficient, L, of the output section of the fiberiIndicating the length of the output length of fiber.
Focal length dispersion phi' of time lensf＝-φ″p/2＝-β2pLp/2，β2pIs the second-order dispersion coefficient, L, of the pump light transmission fiberpIs the length of the pump light delivery fiber.
Further, in order to satisfy
And M ═ 1, the specific values of the above parameters are set as follows:
β2s＝20ps2/km，Ls＝1km，β2i＝-20ps2/km，Li＝1km，L p1 km. At this time, M ═ phi ″ "2/φ″1＝-1。
The principle of the scheme of the invention is as follows: the pump light input end of the time lens imaging module is controlled by a digital baseband signal, the pump light is controlled to be in a 'present' state when a digital signal is '1', the pump light is controlled to be in a 'absent' state when the digital signal is '0', the other input end of the time lens imaging module is connected with a sinusoidal signal generating module to receive continuous and uninterrupted sinusoidal signal light, the pump light and the sinusoidal signal light generate a four-wave mixing effect in the time lens imaging module, inversion of sinusoidal signal light is realized according to a set imaging coefficient M being-1, and signals output by the pump light (shown in figure 5) and the sinusoidal signal light (shown in figure 6) after passing through the time lens imaging module are modulated sinusoidal signal light, namely PSK signals (shown in figure 7).
Example two:
referring to fig. 8, the present embodiment provides a PSK modulation method based on a time lens, and a PSK modulation system based on a time lens according to the first embodiment includes:
s1, the digital baseband signal module sends out a digital baseband signal 1 or 0 to control the level of the pump light sent to the time lens imaging module by the pump light generation module;
s2, the sinusoidal signal generation module continuously generates sinusoidal signal light sent to the time lens imaging module;
and S3, generating four-wave mixing effect in the time lens imaging module by the pump light and the sinusoidal signal light, and outputting the modulated sinusoidal signal light through the time lens imaging module.
It should be noted that, similar to the embodiments, the PSK modulation method based on the time lens provided in this embodiment is not described in detail herein.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention by those skilled in the art should fall within the protection scope of the present invention without departing from the design spirit of the present invention.
Claims (10)
1. A PSK modulation system based on a time lens is characterized by comprising a digital baseband signal module, a pump light generation module, a time lens imaging module and a sinusoidal signal generation module;
the pump light generation module and the sine signal generation module are respectively connected with the time lens imaging module, and the pump light generation module is also connected with the digital baseband signal module;
the digital baseband signal module is used for sending out a digital baseband signal 1 or 0 so as to control the level of the pump light sent to the time lens imaging module by the pump light generation module;
the sinusoidal signal generating module is used for continuously generating sinusoidal signal light sent to the time lens imaging module;
the pump light and the sinusoidal signal light generate a four-wave mixing effect in the time lens imaging module, and the modulated sinusoidal signal light is output through the time lens imaging module.
2. The PSK modulation system according to claim 1, wherein the time lens imaging module includes an input section fiber, a time lens, an output section fiber, and a pump light transmission fiber connected to the time lens;
the sinusoidal signal generating module is connected with the time lens through an input section optical fiber, the pump light generating module is connected with the time lens through a pump light transmission optical fiber, and an output section optical fiber is used for outputting modulated sinusoidal signal light.
3. The time-lens based PSK modulation system according to claim 2, wherein the input section second-order dispersion quantity of the input section optical fiber is Φ ″1The second-order dispersion of the output section optical fiber is phi ″)2And phi ″)2＝-φ″1。
4. The time-lens based PSK modulation system according to claim 3, wherein the imaging coefficient M of the time-lens imaging module is ═ phi ″2/φ″1＝-1。
5. The PSK modulation system as claimed in claim 4, wherein the time lens has a focal length dispersion of φ ″fAnd is and
6. the time-lens based PSK modulation system according to claim 5, wherein the width of the pump light pulse is equal to the width of one-cycle waveform of the sinusoidal signal light.
7. A time-lens based PSK modulation system as claimed in claim 6,
input segment second-order dispersion phi1＝β2sLsWherein, β2sRepresenting the second-order dispersion coefficient, L, of the input section fibersIndicating the length of the input length of fiber.
8. A time-lens based PSK modulation system as claimed in claim 7,
second-order dispersion phi of output section2＝β2iLiWherein, β2iRepresenting the second-order dispersion coefficient, L, of the output section of the fiberiIndicating the length of the output length of fiber.
9. A time-lens based PSK modulation system as claimed in claim 8,
focal length dispersion phi' of time lensf＝-φ″p/2＝-β2pLp/2，β2pIs the second-order dispersion coefficient, L, of the pump light transmission fiberpIs the length of the pump light delivery fiber.
10. A time-lens-based PSK modulation method, based on any of claims 1-9, characterized by comprising the steps of:
s1, the digital baseband signal module sends out a digital baseband signal 1 or 0 to control the level of the pump light sent to the time lens imaging module by the pump light generation module;
s2, the sinusoidal signal generation module continuously generates sinusoidal signal light sent to the time lens imaging module;
and S3, generating four-wave mixing effect in the time lens imaging module by the pump light and the sinusoidal signal light, and outputting the modulated sinusoidal signal light through the time lens imaging module.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102388298A (en) * | 2009-02-05 | 2012-03-21 | 康奈尔大学 | High-speed optical sampling by temporal stretching using four-wave mixing |
| US20160197698A1 (en) * | 2013-09-06 | 2016-07-07 | Danmarks Tekniske Universitet | All-optical orthogonal frequency division multiplexing (ofdm) demultiplexer |
| CN106405975A (en) * | 2016-12-16 | 2017-02-15 | 北京邮电大学 | Efficient all-optical regeneration method of multilevel phase shift keying optical signal |
| CN107408988A (en) * | 2015-03-10 | 2017-11-28 | 关鹏宇 | Full light conversion between ofdm signal and Nyquist WDM signal |
| US20180267387A1 (en) * | 2017-03-16 | 2018-09-20 | Thomas Schneider | System and Method for Optical Sampling without an Optical Source |
| CN111490828A (en) * | 2020-04-03 | 2020-08-04 | 浙江工业大学 | Optical pulse signal positive and negative code encoding system based on time lens imaging |
| CN112034625A (en) * | 2020-08-17 | 2020-12-04 | 浙江工业大学 | Optical pulse polarization multiplexing compression system based on time lens imaging |
-
2021
- 2021-09-16 CN CN202111085532.6A patent/CN113960848B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102388298A (en) * | 2009-02-05 | 2012-03-21 | 康奈尔大学 | High-speed optical sampling by temporal stretching using four-wave mixing |
| US20160197698A1 (en) * | 2013-09-06 | 2016-07-07 | Danmarks Tekniske Universitet | All-optical orthogonal frequency division multiplexing (ofdm) demultiplexer |
| CN107408988A (en) * | 2015-03-10 | 2017-11-28 | 关鹏宇 | Full light conversion between ofdm signal and Nyquist WDM signal |
| CN106405975A (en) * | 2016-12-16 | 2017-02-15 | 北京邮电大学 | Efficient all-optical regeneration method of multilevel phase shift keying optical signal |
| US20180267387A1 (en) * | 2017-03-16 | 2018-09-20 | Thomas Schneider | System and Method for Optical Sampling without an Optical Source |
| CN111490828A (en) * | 2020-04-03 | 2020-08-04 | 浙江工业大学 | Optical pulse signal positive and negative code encoding system based on time lens imaging |
| CN112034625A (en) * | 2020-08-17 | 2020-12-04 | 浙江工业大学 | Optical pulse polarization multiplexing compression system based on time lens imaging |
Non-Patent Citations (1)
| Title |
|---|
| REZA SALEM ET AL: "Application of space–time duality to ultrahigh-speed optical signal processing", 《ADVANCES IN OPTICS AND PHOTONICS 》 * |
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