CN110989210A - Tunable optical frequency comb generation device and method based on EAM and pulse signal - Google Patents
Tunable optical frequency comb generation device and method based on EAM and pulse signal Download PDFInfo
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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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/015—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 for the control of the intensity, phase, polarisation or colour based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction
- G02F1/017—Structures with periodic or quasi periodic potential variation, e.g. superlattices, quantum wells
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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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/015—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 for the control of the intensity, phase, polarisation or colour based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction
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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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/015—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 for the control of the intensity, phase, polarisation or colour based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction
- G02F1/0155—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 for the control of the intensity, phase, polarisation or colour based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction modulating the optical absorption
- G02F1/0157—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 for the control of the intensity, phase, polarisation or colour based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction modulating the optical absorption using electro-absorption effects, e.g. Franz-Keldysh [FK] effect or quantum confined stark effect [QCSE]
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Abstract
The invention discloses a tunable optical frequency comb generation device based on an EAM and a pulse signal.A bit sequence generator controls a pulse generator to generate a periodic pulse signal, the periodic pulse signal is amplified by an electric amplifier and then shunted by an electric power divider, finally passes through a first adjustable attenuator and a second adjustable attenuator and then respectively reaches an electric absorption modulator a and an electric absorption modulator b for driving control, a continuous light source outputs single-wavelength continuous light to the electric absorption modulator a to generate a comb-shaped spectrum, then the comb-shaped spectrum is modulated by the electric absorption modulator b to obtain an optical frequency comb, and the optical frequency comb is input to a spectrometer for analysis. The invention also discloses a tunable optical frequency comb generation method based on the EAM and the pulse signal. The tunable optical frequency comb generation device and method based on the EAM and the pulse signal can generate the optical frequency comb which is continuous in frequency spectrum, high in power flatness, wide in coverage spectrum range, multiple in frequency component and tunable in frequency interval.
Description
Technical Field
The invention relates to a tunable optical frequency comb generation device and method based on an EAM and a pulse signal, and belongs to the field of optics.
Background
At present, WDM systems have played a great role in optical communication backbone networks, and according to the recommendation of ITU-T standard, WDM systems require a large number of light sources with equal power and wide channel spacing as carriers to implement modulation and transmission of information in the subsequent optical communication process, but the multi-wavelength laser or optical transmission module has high cost and limited designability, which is one of the bottlenecks facing WDM systems at the optical transmission end. The optical frequency comb can reduce or even replace a multi-wavelength laser, reduce the cost of the optical communication system, has the advantages of channel interval, designable optical comb line number and the like, and has wide application prospect in future optical communication backbone networks.
Optical Frequency Combs (OFCs), referred to as "optical combs". The optical comb shows discrete frequency components with equal intervals on a frequency domain and a time domain, and is equivalent to collinear synchronous output of a plurality of single-frequency lasers with mutually locked phases. The optical comb has wide spectrum coverage range, narrow line width of a single frequency component, and frequency stability in Hertz level and time resolution in femtosecond level. The method has the characteristics of approximately equal power of frequency components, equal frequency intervals, more frequency components, narrow line width of a single frequency component and the like, and provides a link bridge for various frequency standards such as a microwave frequency standard, an atomic frequency standard, an optical frequency standard and the like.
The existing methods for generating the optical frequency comb at home and abroad mainly comprise: an optical comb generation method based on an optical fiber nonlinear effect, an optical comb generation method based on an optoelectronic oscillator (OEO), an optical comb generation method based on a mode-locked fiber laser, an optical comb generation method based on a micro-ring resonant cavity and an optical comb generation method based on a modulator. The modulator-based optical comb generation method includes a mach-zehnder modulator (MZM) -based method, a Phase Modulator (PM) -based method, an Intensity Modulator (IM) -based method, an electroabsorption modulator (EAM) -based method, a method based on a cascade of MZM, PM or IM and an electroabsorption modulator (EAM), and the like.
Specifically, the optical comb generation method based on the modulator mainly includes: driving a modulator by adopting a radio frequency signal (RF), and modulating laser by utilizing the cascading action of MZM and PM to generate an optical comb; driving a modulator by using RF, and modulating to generate an optical comb by using the modulation effect of a plurality of cascaded or parallel MZMs on laser; driving a modulator by using RF, and modulating laser by using the cascading action of MZM and EAM to generate an optical comb; comb spectrum is generated by using a single modulator or cascade modulation of a plurality of modulators, and then an optical comb is generated through a circulating frequency shift loop.
However, in the existing schemes for generating optical frequency combs based on modulators, no scheme for generating ideal optical combs based on a single EAM has been developed. Although there are schemes for generating dual optical combs based on a single RF signal and a single EAM, the spectral discontinuity of the optical frequency combs generated by the modulation of the single EAM in the schemes requires the use of optical filters to obtain the dual optical combs. In addition, in the scheme of generating the optical frequency comb based on the modulator in the prior art, it is difficult to generate the optical frequency comb which has high power flatness, wide coverage spectrum range, many frequency components and tunable frequency interval.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a tunable optical frequency comb generation device and method based on EAM and pulse signals, which can generate an optical frequency comb with continuous frequency spectrum, high power flatness, wide coverage spectrum range, multiple frequency components and tunable frequency interval.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a tunable optical frequency comb generating device based on EAM and pulse signals comprises a continuous light source, an electro-absorption modulator a, an electro-absorption modulator b, a bit sequence generator, a pulse generator, an electric amplifier, an electric power divider, a first adjustable attenuator and a second adjustable attenuator, the bit sequence generator outputs a binary bit sequence, controls the pulse generator to generate a periodic pulse signal, the periodic pulse signal is amplified by the electric amplifier and then shunted by the electric power divider, and finally reaches the electroabsorption modulator a and the electroabsorption modulator b for driving control after passing through the first adjustable attenuator and the second adjustable attenuator respectively, the continuous light source outputs single-wavelength continuous light to the electric absorption modulator a to generate a comb spectrum, and then the comb spectrum is modulated by the electric absorption modulator b to obtain the optical frequency comb.
The continuous light source is a continuous laser.
The electroabsorption modulator a comprises a quantum confined Stackers effect electroabsorption modulator or a multiple quantum well electroabsorption modulator.
The electroabsorption modulator b comprises a quantum confined Stackers effect electroabsorption modulator or a multiple quantum well electroabsorption modulator.
A method for tunable optical frequency comb generation based on EAM and a pulsed signal, comprising the steps of:
step a, setting a bit sequence generator, outputting a binary bit sequence, and controlling a pulse generator to generate a periodic pulse signal;
b, the periodic pulse signals respectively drive and control the electroabsorption modulator a and the electroabsorption modulator b;
c, outputting single-wavelength continuous light to the electro-absorption modulator a by the continuous light source, and modulating to generate a comb spectrum with frequency intervals equal to the frequency of the periodic pulse signal;
and d, modulating the comb spectrum by the electro-absorption modulator b to improve the power flatness of the comb spectrum and increase the number of frequency components, so as to obtain the optical frequency comb with more frequency components and high power flatness, and inputting the optical frequency comb into a spectrometer for analysis.
The pulse signal generated by the pulse generator is amplified by the amplifier and then input into the electroabsorption modulator a and the electroabsorption modulator b.
The pulse signal is attenuated by the first adjustable attenuator and then enters the electric absorption modulator a.
And the pulse signal is attenuated by the second adjustable attenuator and then enters the electric absorption modulator b.
The amplitude of the periodic pulse signal can be tuned by adopting the process of amplifying the signal firstly and then attenuating the signal.
The invention has the beneficial effects that: the invention provides a tunable optical frequency comb generating device and method based on EAM and pulse signals, wherein a pulse generator is utilized to output periodic pulse signals with a certain waveform to an electric absorption modulator a and an electric absorption modulator b, the electric absorption modulator a is driven by the pulse signals to modulate input continuous light to generate a comb-shaped spectrum, and the comb-shaped spectrum is modulated by the electric absorption modulator b to improve the power flatness of the comb-shaped spectrum and increase the number of frequency components, so that an optical frequency comb with a large number of frequency components and high power flatness is obtained, and the tunable optical frequency comb has the advantages of simple structure, easiness in realization, high spectrum flatness of the optical frequency comb, wide coverage spectrum range, a large number of frequency components, tunable frequency interval and the like; the comb spectrum output by the electroabsorption modulator a has better power flatness by setting a pulse generator to output a proper pulse signal waveform; the frequency interval of the optical frequency comb generated by the modulation of the electroabsorption modulator (b) is tunable by varying the bit rate of the pulse generator, varying the period of the pulse signal. The generated optical frequency comb has good spectral characteristics, has advantages in frequency components, coverage spectral range and flatness, and can be applied to systems such as high-speed optical communication.
Drawings
FIG. 1 is a schematic diagram of an optical frequency comb generating apparatus according to the present invention;
FIG. 2 is a comb spectrum of the output of electroabsorption modulator a in an embodiment of the present invention;
FIG. 3 is a diagram of the optical frequency comb spectrum with a frequency interval of 2.5GHz output by the electro-absorption modulator b in an embodiment of the present invention;
FIG. 4 is a diagram of the optical frequency comb spectrum with a frequency interval of 5GHz output by the electro-absorption modulator b in an embodiment of the present invention.
Detailed Description
The present invention is further described with reference to the accompanying drawings, and the following examples are only for clearly illustrating the technical solutions of the present invention, and should not be taken as limiting the scope of the present invention.
As shown in FIG. 1, the invention discloses a tunable optical frequency comb generation device based on an electro-absorption modulator and a pulse signal, which comprises a continuous light source, an electro-absorption modulator a, an electro-absorption modulator b, a bit sequence generator, a pulse generator, an electric amplifier, an electric power divider, a first adjustable attenuator, a second adjustable attenuator and a spectrometer. The bit sequence generator outputs a corresponding binary bit sequence, and controls the pulse generator to generate a periodic pulse signal with a certain waveform to drive the electro-absorption modulator a and the electro-absorption modulator b. The periodic pulse signals are amplified by the electric amplifier, then are shunted by the electric power divider, and finally reach the electric absorption modulator a and the electric absorption modulator b after passing through the first adjustable attenuator and the second adjustable attenuator respectively. The continuous light source is preferably a continuous laser, the continuous laser outputs single-wavelength continuous light to an electro-absorption modulator a, and the electro-absorption modulator a generates a comb spectrum with frequency intervals equal to the frequency of the pulse signal; after the comb spectrum is modulated by the electro-absorption modulator b, the power of the high-order optical sideband which cannot be observed is increased originally because the power is too small, so that the power flatness of the comb spectrum is improved, the number of frequency components is increased, and the OFC with a large number of frequency components and high power flatness is obtained.
The electro-absorption modulators a and b are quantum-confined Steckel-effect electro-absorption modulators (QCSE-EAM) or multi-quantum-well electro-absorption modulators (MQW-EAM).
The invention also discloses a tunable optical frequency comb generation method based on the electro-absorption modulator and the pulse signal, which is characterized in that: the method comprises the following steps:
step one, setting a bit sequence generator, outputting a binary bit sequence, and controlling a pulse generator to generate a periodic pulse signal.
And step two, the periodic pulse signal is amplified by an electric amplifier, then is shunted by an electric power divider, and finally reaches an electroabsorption modulator a and an electroabsorption modulator b respectively after passing through a first adjustable attenuator and a second adjustable attenuator for driving control.
And step three, the continuous light source outputs single-wavelength continuous light to the electro-absorption modulator a, and the comb spectrum with the frequency interval equal to the frequency of the pulse signal is generated through modulation.
And step four, after the comb spectrum is modulated by the electro-absorption modulator b, the power flatness of the comb spectrum is improved, the number of frequency components is increased, and the optical frequency comb with the large number of frequency components and high power flatness is obtained and input to the spectrometer for analysis.
The pulse signal for driving the electro-absorption modulator a to generate the comb spectrum may be periodic highThe waveform of the pulse can be equivalently expressed as 4 power ratios of 56:28:8:1 and frequencies of 2f respectively according to the Fourier series relationc、4fc、6fcAnd 8fcIs equivalent to 8 frequency signals with fcMultiplicatively coupled. The comb spectrum generated by driving the electro-absorption modulator a is equivalent to 4 sets of frequency intervals of fcThe OFC spectra of (1) are superposed, so that the comb spectrum has higher power flatness.
The bit sequence generator outputs a binary bit sequence, the pulse generator is controlled to generate a corresponding periodic Gaussian pulse signal to drive the electric absorption modulator a, and the bit sequence and the bit rate of the pulse generator determine the Gaussian pulse width output by the pulse generator, the comb spectrum output by the corresponding electric absorption modulator a and the frequency interval of the OFC output by the electric absorption modulator b.
Modulation factor, chirp factor of electro-absorption modulator and bias voltage V of electro-absorption modulatorbiasModulating voltage VpulseIt is related. By adjusting the bias voltage and the modulation voltage and changing the modulation coefficient and the chirp factor, the spectrum generated by the modulation of the electro-absorption modulator has better flatness and more frequency component numbers.
The first embodiment is as follows: initially setting the center frequency of a continuous laser to be 193.1THz, the optical power to be 10dBm, the initial phase to be 0 and the line width to be 10 MHz; the output bit sequence of the bit sequence generator is 10101010, the pulse width of the Gaussian pulse output by the pulse generator is 50%, and the bit rate is 5 GBit/s; the modulation factor of the electro-absorption modulator a is 0.51, the chirp factor is 16, the modulation factor of the electro-absorption modulator a is 0.98, and the chirp factor is 16.
Light output by the light source is injected into an electro-absorption modulator a, and the electro-absorption modulator a generates a comb spectrum with a frequency component of 7, a frequency interval of 2.5GHz and a flatness of 3.2dB under the driving of a periodic Gaussian pulse signal generated by a pulse generator controlled by a bit sequence 10101010, as shown in FIG. 2. After the comb spectrum is modulated by an electric absorption modulator b driven by the same pulse signal, an optical frequency comb with the frequency component number of 33, the frequency interval of 2.5GHz and the flatness of 3.6dB is obtained, as shown in FIG. 3. By increasing the bit rate of the pulse generator to 10Gbit/s, the electro-absorption modulator b outputs an optical frequency comb with a frequency component number of 33, a frequency spacing of 5GHz, and a flatness of 3.6dB, as shown in fig. 4.
In summary, the present invention utilizes the bit sequence generator to control the pulse generator to output a periodic pulse signal with a certain waveform, and drives the electroabsorption modulator a and the electroabsorption modulator b to modulate the input light to generate the optical frequency comb, which has the advantages of simple structure, easy operation, high spectral flatness of the optical frequency comb, large number of frequency components, tunable frequency intervals, good spectral characteristics of the generated optical frequency comb, and advantages in both frequency component number and flatness, fills the blank of generating the tunable optical frequency comb based on the EAM, and can be applied to the ultra-dense wavelength division multiplexing system of optical communication.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. A tunable optical frequency comb generation device based on an EAM and a pulse signal, comprising: the pulse generator is controlled by the bit sequence generator, periodic pulse signals generated by the pulse generator are respectively input into the electric absorption modulator a and the electric absorption modulator b, and light generated by the continuous light source is modulated by the electric absorption modulator a and the electric absorption modulator b in sequence to generate an optical frequency comb.
2. The apparatus of claim 1, wherein the apparatus is configured to generate the EAM and pulse signal based tunable optical frequency comb by: an electric amplifier, an electric power divider and a first adjustable attenuator are sequentially connected between the pulse generator and the electric absorption modulator a.
3. The apparatus of claim 1, wherein the apparatus is configured to generate the EAM and pulse signal based tunable optical frequency comb by: an electric amplifier, an electric power divider and a second adjustable attenuator are sequentially connected between the pulse generator and the electric absorption modulator b.
4. The apparatus of claim 1, wherein the apparatus is configured to generate the EAM and pulse signal based tunable optical frequency comb by: the continuous light source is a continuous laser.
5. The apparatus of claim 1, wherein the apparatus is configured to generate the EAM and pulse signal based tunable optical frequency comb by: the electroabsorption modulator a comprises a quantum confined Stackers effect electroabsorption modulator or a multiple quantum well electroabsorption modulator.
6. The apparatus of claim 1, wherein the apparatus is configured to generate the EAM and pulse signal based tunable optical frequency comb by: the electroabsorption modulator b comprises a quantum confined Stackers effect electroabsorption modulator or a multiple quantum well electroabsorption modulator.
7. A tunable optical frequency comb generation method based on EAM and pulse signals is characterized in that: the method comprises the following steps:
step a, setting a bit sequence generator, outputting a binary bit sequence, and controlling a pulse generator to generate a periodic pulse signal;
b, driving and controlling the electroabsorption modulator a and the electroabsorption modulator b by the periodic pulse signals respectively;
c, outputting single-wavelength continuous light to the electro-absorption modulator a by the continuous light source, and modulating to generate a comb spectrum with frequency intervals equal to the frequency of the periodic pulse signal;
and d, modulating the comb spectrum by the electro-absorption modulator b to improve the power flatness of the comb spectrum and increase the number of frequency components, thereby obtaining the optical frequency comb with more frequency components and high power flatness.
8. The method of claim 7, wherein the method comprises: in the step b, the periodic pulse signal is input into the electroabsorption modulator a and the electroabsorption modulator b after signal amplification.
9. The method of claim 8, wherein the method comprises: the periodic pulse signal is input to the electroabsorption modulator a after being amplified and attenuated.
10. The method of claim 8, wherein the method comprises: the periodic pulse signal is input into an electroabsorption modulator b after being amplified and attenuated.
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| CN112987442A (en) * | 2021-02-24 | 2021-06-18 | 南京邮电大学 | Broadband tunable optical frequency comb generation device and method |
| CN115343866A (en) * | 2022-08-19 | 2022-11-15 | 西安邮电大学 | Optical frequency comb generation system |
| CN119030616A (en) * | 2024-07-23 | 2024-11-26 | 北京航空航天大学 | Ultra-wideband electromagnetic pulse signal generation device and method based on optical frequency comb |
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Application publication date: 20200410 |