CN110401098B - Optical frequency comb flatness control device based on optical filtering - Google Patents
Optical frequency comb flatness control device based on optical filtering Download PDFInfo
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Abstract
The invention belongs to the technical field of ultrafast optics, and particularly relates to an optical frequency comb flatness control device based on optical filtering, which comprises an optical frequency comb source, a beam splitting module, a phase modulation module, a repeated frequency harmonic detection module, an etalon filtering module, a phase locking control module and a phase locking detection module; the optical frequency comb source is respectively connected with an etalon filtering module, a phase modulation module and a repetition frequency harmonic detection module after passing through the beam splitting module; an etalon filtering module, a phase-locking detection module and a phase-locking control module are sequentially connected behind the phase modulation module; the back of the repetition frequency harmonic detection module is respectively connected with a phase modulation module and a phase locking control module; the phase-locked control module is connected to the repetition frequency harmonic detection module. According to the invention, the optical frequency comb teeth and the etalon filter are locked by using the phase-locking control and detection module, and a transmission curve with complementary optical frequency comb spectrum curves is formed by using etalon filtering characteristics, so that the control optimization of the optical frequency comb flatness is effectively realized; the device does not need an additional light source for reference and has a simple structure.
Description
Technical Field
The invention belongs to the technical field of ultrafast optics, and particularly relates to an optical frequency comb flatness control device based on optical filtering.
Background
The femtosecond optical frequency comb has ultra-fast time resolution and ultra-high frequency precision, and provides a larger platform for scientific research to research and explore natural laws. Meanwhile, each optical frequency comb tooth in the time-frequency domain precise control femtosecond optical frequency comb has a single longitudinal mode and is continuousThe narrow linewidth characteristic of the laser is equivalent to 105Or 106A frequency stabilized continuous laser. After more than ten years of development, the light source has become an ideal light source for scientific researches such as precise spectral measurement, basic physical constant determination, astronomical measurement, quantum optical control and the like, and is one of the leading directions in the current optical field.
Furthermore, the high repetition frequency optical frequency comb has wide comb tooth intervals (greater than 10GHz), high pulse refreshing speed and special application potential, has wide application prospect in the fields of astronomical optical comb, channelization, optical sampling, wireless optical communication and arbitrary waveform generation, and becomes a research hotspot in recent years.
Due to the fact that repetition frequency is too high, the traditional active and passive mode locking modes such as a fiber laser and a solid laser cannot meet the requirements. Therefore, the current generation methods of the high repetition frequency optical frequency comb mainly include microcavity, quantum dot mode locking, electrical cascade modulation, and the like. The modes have advantages and disadvantages respectively, the microcavity technology has the characteristics of small volume and high repetition frequency, but the microcavity technology has larger noise and limited repetition frequency tuning range; the quantum dot mode locking technology has the advantages of wide spectrum and compact structure, but the repetition frequency tuning range is limited, and the synchronization with external reference light is difficult; the electrical cascade modulation technology has the characteristics of large repetition frequency tuning range and convenient synchronization with external reference light, but the system is relatively complex. Most importantly, the high repetition frequency optical frequency combs generated by several methods all have symmetrical spectral curve distribution, but the characteristic of poor flatness exists, so that the available spectral components are limited, and the wider application of the high repetition frequency optical frequency combs is severely limited.
Disclosure of Invention
The invention aims to provide an optical frequency comb flatness control device based on optical filtering according to the defects of the prior art. The device locks the comb teeth of the optical frequency comb and the etalon filter by utilizing a phase-locked loop technology, and forms a transmission curve with complementary spectrum curves of the optical frequency comb by utilizing the filtering characteristics of the etalon, so that the control optimization of the flatness of the optical frequency comb is effectively realized.
The invention relates to an optical frequency comb flatness control device based on optical filtering, which comprises an optical frequency comb source 100, a beam splitting module 200, a phase modulation module 300, a repeated frequency harmonic detection module 400, an etalon filtering module 500, a phase locking control module 600 and a phase locking detection module 700;
further, the optical frequency comb source 100 is connected to an etalon filtering module 500, a phase modulation module 300 and a repetition frequency harmonic detection module 400 through the beam splitting module 200; the etalon filtering module 500, the phase-locking detection module 700 and the phase-locking control module 600 are sequentially connected behind the phase modulation module 300; the repetition frequency harmonic detection module 400 is connected with a phase modulation module 300 and a phase locking control module 600 respectively; the phase-locked control module 600 is connected to the repetition frequency harmonic detection module 500.
Further, the phase modulation module 300 includes a narrow-band optical filter, an optical amplifier, and a phase modulator, which are sequentially disposed.
Further, the repetition frequency harmonic detection module 400 includes a high-speed photodetector, a radio frequency band-pass filter, a radio frequency amplifier, and a radio frequency power divider, which are sequentially disposed.
Further, the etalon filtering module 500 includes two-in and two-out FP etalon and electrically controlled piezoelectric ceramic; the electric control piezoelectric ceramic is adhered to the FP etalon, and the FP etalon generates a transmission curve which is complementary with a light frequency comb spectrum curve.
Further, the phase-locked control module 600 includes a phase-locked amplifier and a piezoelectric ceramic driver, which are sequentially disposed.
Further, the phase-locked detection module 700 includes a high-speed photodetector and a radio frequency filter, which are sequentially disposed.
The invention has the beneficial effects that:
1. the optical frequency comb teeth and the etalon filter are locked based on a phase-locked loop technology, and meanwhile, a transmission curve with complementary optical frequency comb spectral curves is formed by utilizing etalon filtering characteristics, so that the control optimization of the optical frequency comb flatness is effectively realized, the application of the optical frequency comb teeth and the etalon filter characteristics to the optical frequency comb control technology can be directly expanded, and the optical frequency comb with stable and high flatness is obtained;
2. the optical filter device of the FP etalon has a simple structure, can realize different transmission spectrum curve contrasts of the FP etalon by changing the transmission and reflection coefficients of the cavity mirror, generates a complementary transmission curve of a spectrum curve of the optical frequency comb, and realizes effective control of the optical frequency comb with different initial flatness.
3. The adopted FP etalon cavity is small and adjustable in length, so that the control optimization of the flatness of the high-repetition-frequency optical frequency comb can be realized, and the requirements of special fields such as optical frequency metrology, optical communication and the like are met;
4. the working wavelength of the FP etalon is variable, so that the FP etalon is suitable for high repetition frequency optical frequency combs with different wave bands, and can meet the requirements of different fields;
5. the adopted phase-locked control technology does not need additional light source reference, and has simple structure, integration and high stability;
6. the adopted multiple-frequency harmonic signal modulation structure has the advantages of simple structure, convenience in operation, continuous tuning of multiple frequencies, high flexibility and capability of meeting the control application of flatness of the optical frequency comb with different multiple frequencies.
Drawings
FIG. 1 is a schematic diagram of a control device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another implementation manner of a control device in the embodiment of the invention;
FIG. 3 is a schematic diagram of a preferred implementation of a control device in an embodiment of the invention;
in the figure, an optical frequency comb source 100, a beam splitting module 200, an optical fiber beam splitter 201, beam splitting mirrors 202 and 204; all-reflecting mirrors 203, 205; a phase modulation module 300, a fiber narrow-band filter 301, a fiber amplifier 302, a phase modulator 303, total reflection mirrors 304, 306, 307 and a transmission grating 305; a repetition frequency harmonic detection module 400, a high-speed photoelectric detector 401, a radio frequency band-pass filter 402, a radio frequency amplifier 403 and a radio frequency power divider 404; an etalon filtering module 500, an optical fiber coupling FP etalon 501 and piezoelectric ceramics 502; a phase-locked control module 600, a phase-locked amplifier 601, a piezoelectric ceramic driver 602; a phase-locked detection module 700, a high-speed photodetector 701, and a radio frequency filter 702.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly and completely apparent, the technical solutions in the embodiments of the present invention are described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, in an embodiment, an optical frequency comb flatness control apparatus based on optical filtering in an all-fiber structure may include a structure including an optical frequency comb source 100, a beam splitting module 200, a phase modulation module 300, an overfrequency harmonic detection module 400, an etalon filtering module 500, a phase-locking control module 600, and a phase-locking detection module 700; the optical frequency comb source 100 is connected to an etalon filtering module 500, a phase modulation module 300 and a repetition frequency harmonic detection module 400 through the beam splitting module 200; the etalon filtering module 500, the phase-locking detection module 700 and the phase-locking control module 600 are sequentially connected behind the phase modulation module 300; the repetition frequency harmonic detection module 400 is connected with a phase modulation module 300 and a phase locking control module 600 respectively; the phase-locked control module 600 is connected to the repetition frequency harmonic detection module 500.
It can be understood that, by the above connection method, the output end of the beam splitting module 200 can be divided into three paths:
the first path is directly output through the etalon filtering module 500;
the second path passes through the phase modulation module 300 and the etalon filtering module 500 and then is connected with the input end of the phase-locked detection module 700;
the third path passes through the repetition frequency harmonic detection module 400 and then is connected to the radio frequency input terminals of the phase modulation module 300 and the phase-locked control module 600, respectively.
Meanwhile, the output end of the phase-locked detection module 700 is connected to the radio frequency input end of the etalon filtering module 500 through the phase-locked control module 600, so as to form a feedback closed loop.
In one embodiment, as shown in FIG. 2:
the optical frequency comb source 100 outputs multi-longitudinal mode laser with locked absolute frequency and stable spectral curve, and the central working waveband is arbitrary;
the beam splitting module 200 is an optical fiber beam splitter 201;
the phase modulation module 300 comprises an optical fiber narrow-band filter 301, an optical fiber amplifier 302 and a phase modulator 303 which are arranged in sequence;
the repetition frequency harmonic detection module 400 comprises a high-speed photoelectric detector 401, a radio frequency band-pass filter 402, a radio frequency amplifier 403 and a radio frequency power divider 404 which are arranged in sequence;
the etalon filtering module 500 comprises an optical fiber coupling FP etalon 501 and piezoelectric ceramics 502 which are arranged in sequence;
the phase-locked control module 600 comprises a phase-locked amplifier 601 and a piezoelectric ceramic driver 602 which are arranged in sequence;
the phase-locked detection module 700 includes a high-speed photodetector 701 and a radio frequency filter 702, which are sequentially disposed. The specific connection relationship is that the input end of the optical fiber beam splitter 201 is connected to the optical frequency comb source 100, and the output is divided into three paths:
the first path is directly output after passing through the optical fiber coupling FP etalon 501;
the second path passes through an optical fiber narrow-band filter 301, an optical fiber amplifier 302, a phase modulator 303 and an optical fiber coupling FP etalon 501 and then is connected with a high-speed photoelectric detector 701;
the third path is connected with the input end of the high-speed photoelectric detector 401, the output of the high-speed photoelectric detector 401 is sequentially connected with the radio frequency band-pass filter 402, the radio frequency amplifier 403 and the radio frequency power divider 404, and then divided into two paths which are respectively connected with the phase modulator 303 and the phase-locked amplifier 601; finally, the output of the high-speed photodetector 701 passes through the radio frequency filter 702 and then is connected to the lock-in amplifier 601, and the output of the lock-in amplifier 601 passes through the piezoelectric ceramic driver 602 and then is connected to the piezoelectric ceramic 502.
Optionally, the optical fiber beam splitter 201 may split the laser beam, so that the working bandwidth is large, all spectral components can be ensured to pass through, and the splitting ratio is adjustable;
optionally, the optical fiber narrow-band filter 301 may filter central single-frequency light of the optical frequency comb source; the working bandwidth of the phase modulator 303 meets the phase modulation of the repetition frequency harmonic; the central frequency of the rf band-pass filter 402 corresponds to the higher harmonic of the repetition frequency and has an adjustable order, preferably 10 orders, although the invention is not limited to 10 orders, and may be 8 orders, 9 orders, 11 orders, and so on.
Optionally, the piezoelectric ceramic 502 is pasted on the optical fiber coupling FP etalon 501, and the distance between the FP etalons can be changed; the optical fiber coupling FP etalon 501 can adjust the fineness and generate a transmission curve which is complementary with the optical frequency comb spectrum curve; the lock-in amplifier 601 generates a corresponding error signal based on the PDH technique.
The optical frequency comb source 100 outputs multi-longitudinal mode laser to enter the optical fiber beam splitter 201 for beam splitting, the second path firstly carries out optical filtering through the optical fiber narrow-band filter 301, and the filtered single-frequency continuous light corresponds to the center comb teeth of the optical frequency comb source and corresponds to the lowest point of the transmissivity of the FP etalon; then, the power is increased through the optical fiber amplifier 302, positive and negative frequency sidebands are generated through the action of the phase modulator 303, and finally, optical signals which are loaded with the positive and negative frequency sidebands and related to the free spectral range of the optical fiber coupling FP etalon 501 are generated after the optical fiber coupling FP etalon 501 is injected, and are converted into corresponding radio frequency signals through the high-speed photoelectric detector 701.
The third path generates a high-order repetition frequency harmonic signal (10 order) of the optical frequency comb through the high-speed photoelectric detector 401 and the radio frequency band-pass filter 402, the order of the repetition frequency harmonic signal can be adjusted according to the flatness of the optical frequency comb, and the corresponding frequency is the same as the free spectral range of the FP etalon; then, the power is amplified and split by the rf amplifier 403 and the rf power splitter 404, and finally the output drives the phase modulator 303 and the connecting lock-in amplifier 601 respectively.
The phase-locked amplifier 601 is connected to use a repetition frequency harmonic signal (10 th order) as a reference signal, a radio frequency signal output by the high-speed photodetector 701 is filtered by the radio frequency filter 702 and then input into the phase-locked amplifier 601 as a detection signal, phase-locked by a PDH technology to generate a feedback error signal, amplitude adjustment is performed by the piezoelectric ceramic driver 602, and finally the piezoelectric ceramic 502 is driven to realize locking of the optical frequency comb and the FP etalon.
On the basis, the first path of connecting optical fiber coupling FP etalon 501 is used for spectrum shape shaping, and the comb teeth are directly output after the flatness is optimized, so that the stable and high-flatness optical frequency comb is obtained.
In another embodiment, the control device may be referred to as shown in fig. 3, in which:
optionally, the optical frequency comb source 100 outputs a multi-longitudinal mode laser with a locked absolute frequency and a stable spectral curve, and the central working waveband is arbitrary;
optionally, the beam splitting module 200 includes beam splitters 202 and 204 and total reflection mirrors 203 and 205 arranged in sequence;
optionally, the phase modulation module 300 includes total reflection mirrors 304, 306, 307, a transmission grating 305, a fiber amplifier 302, and a phase modulator 303, which are sequentially arranged;
optionally, the repetition frequency harmonic detection module 400 includes a high-speed photodetector 401, a radio frequency band-pass filter 402, a radio frequency amplifier 403, and a radio frequency power divider 404, which are sequentially arranged;
optionally, the etalon filtering module 500 includes an optical fiber coupling FP etalon 501 and a piezoelectric ceramic 502, which are sequentially arranged;
optionally, the phase-locked control module 600 includes a phase-locked amplifier 601 and a piezoelectric ceramic driver 602, which are sequentially arranged; the phase-locked detection module 700 includes a high-speed photodetector 701 and a radio frequency filter 702, which are sequentially disposed.
The specific connection relationship may be that the beam splitter 202 divides the optical frequency comb source 100 input in space into two paths: the reflected portion enters the high-speed photodetector 401 and the transmitted portion is subdivided into two paths by the beam splitter 204. Wherein, the reflected part is directly output after passing through the total reflection mirror 205 and the optical fiber coupling FP etalon 501; the transmission part enters a narrow-band filtering combination formed by a transmission grating 305 and a full-reflecting mirror 306 through the full-reflecting mirror 304, and is connected with a high-speed photoelectric detector 701 after passing through the full-reflecting mirror 307, an optical fiber amplifier 302, a phase modulator 303 and an optical fiber coupling FP etalon 501; the output of the high-speed photodetector 401 is connected to the rf band-pass filter 402, the rf amplifier 403, and the rf power divider 404 in sequence, and then divided into two paths, which are connected to the phase modulator 303 and the lock-in amplifier 601, respectively. Finally, the output of the high-speed photodetector 701 passes through the radio frequency filter 702 and then is connected to the lock-in amplifier 601, and the output of the lock-in amplifier 601 passes through the piezoelectric ceramic driver 602 and then is connected to the piezoelectric ceramic 502.
The beam splitters 202 and 204 can split laser beams, so that the working bandwidth is large, all spectral components can be ensured to pass through, and the beam splitting ratio is adjustable; the total reflection mirrors 203, 205, 304, 306 and 307 have large working bandwidths and high reflectivity (more than or equal to 99 percent), and can ensure that all spectral components pass through; the distance between the transmission grating 305 and the total reflection mirror 306 is adjustable, the inclination angle of the total reflection mirror 306 is variable, and the combination can filter out the central single-frequency light of the optical frequency comb source; the working bandwidth of the phase modulator 303 meets the phase modulation of the repetition frequency harmonic; the central frequency of the radio frequency band-pass filter 402 corresponds to the repetition frequency high-order harmonic and the order is adjustable, preferably 10 orders; the piezoelectric ceramic 502 is pasted on the optical fiber coupling FP etalon 501, and the distance between the FP etalon can be changed; the optical fiber coupling FP etalon 501 can adjust the fineness and generate a transmission curve which is complementary with the optical frequency comb spectrum curve; the lock-in amplifier 601 generates a corresponding error signal based on the PDH technique.
The optical frequency comb source 100 outputs multi-longitudinal mode laser, the multi-longitudinal mode laser enters beam splitters 202 and 204 for beam splitting, a second path transmitted by the beam splitter 204 firstly passes through a full-reflection mirror 304 and then enters a tunable filter formed by a transmission grating 305 and a full-reflection mirror 306 for optical filtering, and the filtered single-frequency continuous light corresponds to the central comb teeth of the optical frequency comb source and corresponds to the lowest point of the transmissivity of the FP etalon; then, the power is increased through the optical fiber amplifier 302, positive and negative frequency sidebands are generated through the action of the phase modulator 303, and finally, optical signals which are loaded with the positive and negative frequency sidebands and related to the free spectral range of the optical fiber coupling FP etalon 501 are generated after the optical fiber coupling FP etalon 501 is injected, and are converted into corresponding radio frequency signals through the high-speed photoelectric detector 701.
The third path reflected and output by the beam splitter 202 enters the high-speed photoelectric detector 401 after passing through the total reflection mirror 203, and generates a high-order repetition frequency harmonic signal (10 orders) of the optical frequency comb through the radio frequency band-pass filter 402, wherein the order of the repetition frequency harmonic signal can be adjusted according to the flatness of the optical frequency comb, but the corresponding frequency is the same as the free spectral range of the FP etalon; then, the power is amplified and split by the rf amplifier 403 and the rf power splitter 404, and finally the output drives the phase modulator 303 and the connecting lock-in amplifier 601 respectively.
The phase-locked amplifier 601 is connected, the repetition frequency harmonic signal (10 th order) in step 2 is used as a reference signal, the radio frequency signal output by the high-speed photoelectric detector 701 is filtered by the radio frequency filter 702 and then input into the phase-locked amplifier 601 as a detection signal, the phase-locked processing is performed by the PDH technology, a feedback error signal is generated, the amplitude adjustment is performed by the piezoelectric ceramic driver 602, and finally the piezoelectric ceramic 502 is driven to realize the locking of the optical frequency comb and the FP etalon.
Based on the above process, the first path of connecting optical fiber coupling FP etalon 501 performs spectrum shape shaping, and directly outputs after comb teeth flatness is optimized, thereby obtaining a stable and high-flatness optical frequency comb.
The optical frequency comb teeth and the etalon filter are locked by utilizing a phase-locked loop technology, and meanwhile, a transmission curve with complementary optical frequency comb spectral curves is formed by utilizing etalon filtering characteristics, so that the control optimization of the flatness of the optical frequency comb is effectively realized.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The above-mentioned embodiments, which further illustrate the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An optical frequency comb flatness control device based on optical filtering is characterized by comprising an optical frequency comb source (100), a beam splitting module (200), a phase modulation module (300), a repeated frequency harmonic detection module (400), an etalon filtering module (500), a phase locking control module (600) and a phase locking detection module (700);
the optical frequency comb source (100) is respectively connected with an etalon filtering module (500), a phase modulation module (300) and a repeated frequency harmonic detection module (400) after passing through the beam splitting module (200); the phase modulation module (300) is sequentially connected with an etalon filtering module (500), a phase-locking detection module (700) and a phase-locking control module (600); the back of the repetition frequency harmonic detection module (400) is respectively connected with a phase modulation module (300) and a phase locking control module (600); the phase-locked control module (600) is connected to the repetition frequency harmonic detection module (500);
the etalon filtering module (500) comprises a two-in two-out FP etalon and an electric control piezoelectric ceramic; the electric control piezoelectric ceramic is adhered to the FP etalon, and the FP etalon generates a transmission curve which is complementary with a light frequency comb spectrum curve.
2. The optical-frequency comb flatness control apparatus based on optical filtering as claimed in claim 1, wherein the phase modulation module (300) comprises a narrow-band optical filter, an optical amplifier and a phase modulator sequentially arranged.
3. The optical frequency comb flatness control apparatus based on optical filtering as claimed in claim 1, wherein the repeated frequency harmonic detection module (400) includes a high-speed photodetector, a radio frequency band-pass filter, a radio frequency amplifier and a radio frequency power divider, which are sequentially arranged.
4. The optical-frequency-comb-flatness control device based on optical filtering as claimed in claim 1, wherein the phase-lock control module (600) comprises a phase-lock amplifier and a piezoelectric ceramic driver sequentially arranged.
5. The optical-frequency comb flatness control apparatus based on optical filtering as claimed in claim 1, wherein the phase-locked detection module (700) comprises a high-speed photodetector and a radio-frequency filter arranged in sequence.
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| CN113395128B (en) * | 2020-03-12 | 2023-12-15 | 华为技术有限公司 | Device for generating false optical signal and cascade system |
| CN111901042B (en) * | 2020-08-11 | 2022-03-11 | 中国电子科技集团公司第四十四研究所 | Phase modulation-based large dynamic signal demodulation model method |
| CN113224622A (en) * | 2021-04-21 | 2021-08-06 | 中国人民解放军国防科技大学 | Communication band high-flatness large-comb-tooth-spacing linear polarization electro-optic modulation optical frequency comb light source |
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