CN118011704A - Broadband tunable electro-optic frequency comb generating device - Google Patents
Broadband tunable electro-optic frequency comb generating device Download PDFInfo
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- CN118011704A CN118011704A CN202410101809.7A CN202410101809A CN118011704A CN 118011704 A CN118011704 A CN 118011704A CN 202410101809 A CN202410101809 A CN 202410101809A CN 118011704 A CN118011704 A CN 118011704A
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- 230000003287 optical effect Effects 0.000 claims abstract description 73
- 230000010287 polarization Effects 0.000 claims abstract description 58
- 229940125730 polarisation modulator Drugs 0.000 claims abstract description 15
- 239000000835 fiber Substances 0.000 claims description 19
- 239000013078 crystal Substances 0.000 claims description 9
- 238000001228 spectrum Methods 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 210000001520 comb Anatomy 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000010009 beating Methods 0.000 claims description 3
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
- 239000004038 photonic crystal Substances 0.000 claims description 3
- 229910052691 Erbium Inorganic materials 0.000 claims description 2
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 2
- 230000004927 fusion Effects 0.000 claims description 2
- 244000126211 Hericium coralloides Species 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 230000035559 beat frequency Effects 0.000 abstract 2
- 230000003595 spectral effect Effects 0.000 abstract 1
- 230000005374 Kerr effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
A broadband tunable low noise electro-optic frequency comb generating device is provided. The device uses an ultra-narrow linewidth laser with tunable center wavelength and kHz level linewidth, transmits the generated laser to a polarization controller, then enters a polarization modulator and a cascade electro-optical modulator, modulates the polarization modulator by using a sinusoidal radio frequency signal, and the cascade electro-optical modulator is driven by a signal of a superior radio frequency signal after frequency multiplication to generate an optical frequency comb with wide band and high flatness. The generated optical frequency comb is subjected to beat frequency through an f-2f unit, and a signal obtained after beat frequency is subjected to modulation signal adjustment through a feedback circuit, so that the large-bandwidth tunable electro-optical frequency comb is finally obtained. The method can realize wide-range adjustment of the comb tooth frequency interval, and the generated optical frequency comb has the characteristics of stable and tunable center wavelength, wide spectral line range, multiple comb tooth numbers, accurate comb distance, low phase noise and the like.
Description
Technical Field
The present disclosure relates to the field of optical frequency combs, and in particular, to a broadband tunable electro-optic frequency comb generating device.
Background
An optical frequency comb is a special light source whose spectrum consists of a large number of equally spaced discrete frequency components. The optical frequency comb is just like an optical ruler, so that people can accurately determine the frequency of light, and the optical frequency comb can be used as an accurate spectrum ruler for laser ranging. Optical frequency combs have many promising applications, such as broadband multi-wavelength laser sources, ultra-short pulse generation, arbitrary waveform generation, and optical frequency references. Generally, to achieve these objectives, high coherence, high stability, low noise, large bandwidth, etc. are critical factors. To achieve these properties, many researchers have proposed various schemes for generating optical frequency combs, such as kerr effect using microcavities, mode-locked fiber lasers, etc., but these schemes suffer from high or non-tunable phase noise, narrow bandwidth, etc.
Disclosure of Invention
First, the technical problem to be solved
To solve at least one of the above technical problems occurring in the optical frequency comb in the prior art, an embodiment of the present disclosure provides a broadband tunable low-noise electro-optical frequency comb generating device for generating an optical frequency comb with large bandwidth, tunability, high stability and low phase noise.
(II) technical scheme
The embodiment of the disclosure provides a broadband tunable electro-optic frequency comb generating device, which is used for generating an optical frequency comb with large bandwidth, tunability, high stability and low phase noise, wherein the optical frequency comb generating device comprises a tunable narrow linewidth laser, a first polarization controller, a polarization modulator, a second polarization controller, an electro-optic phase modulator, an optical amplifier, a high nonlinear optical waveguide, an optical filter cavity, a beam splitting coupler, an f-2f unit, a signal generator, a microwave power distributor, a phase shifter, a first broadband microwave power amplifier, a microwave frequency multiplier and a second broadband microwave power amplifier.
The tunable narrow linewidth laser generates stable continuous light with a tunable wavelength range, the continuous light with the tunable wavelength range sequentially passes through the first polarization controller, the polarization modulator, the second polarization controller, the electro-optic phase modulator, the optical amplifier, the high-nonlinearity optical waveguide, the optical filter cavity and the spectrocoupler, and is divided into a first light beam and a second light beam by the spectrocoupler, wherein the first light beam is directly output, the second light beam passes through the f-2f unit, the f-2f unit converts the second light beam from an optical signal into an electric signal, and the electric signal is fed back to the signal generator.
The signal generator generates a microwave signal, the microwave power distributor divides the microwave signal into a first microwave signal and a second microwave signal, the first microwave signal is input into the polarization modulator after sequentially passing through the phase shifter and the first broadband microwave power amplifier, the second microwave signal is input into the electro-optic phase modulator after sequentially passing through the microwave frequency multiplier and the second broadband microwave power amplifier, and the f-2f unit is used for realizing f-2f self-reference.
The first polarization controller and the second polarization controller adjust the polarization state of the continuous light with tunable wavelength range; the polarization modulator and the electro-optic phase modulator generate electro-optic frequency combs for continuous optical modulation with tunable wavelength ranges; the high-nonlinearity optical waveguide is used for widening the frequency spectrum of the continuous light with the tunable wavelength range to one octave; and the optical filter cavity is used for filtering and reducing phase noise.
Optionally, the tunable narrow linewidth laser comprises one of a semiconductor laser in a tunable wavelength form and a fiber laser in a tunable wavelength form.
Optionally, the tunable narrow linewidth laser includes a pre-stabilizing unit for pre-stabilizing the continuous light tunable to the wavelength range.
Optionally, the electro-optic phase modulator comprises a lithium niobate phase modulator.
Optionally, the wavelength range of the continuous light output by the tunable narrow linewidth laser is tunable, and the light polarization direction of the continuous light is any direction.
Optionally, the first polarization controller and the second polarization controller adjust the light polarization direction to the light polarization direction with the optimal modulation efficiency.
Optionally, the signal generator comprises one of a microwave signal generator and a high-speed pulse signal generator.
Optionally, the highly nonlinear optical waveguide comprises one of a photonic crystal fiber, a microstructured fiber, and a fusion tapered single mode fiber.
Optionally, the optical amplifier comprises one of an erbium doped fiber amplifier and a semiconductor optical amplifier.
Optionally, the "f-2f" unit comprises: the device comprises a light splitting coupler, a first band-pass filter, a second band-pass filter, a delay light path, a frequency doubling crystal, a first polarization spectroscope, a half wave plate, a second polarization spectroscope and a photoelectric detector.
The light splitting coupler is used for splitting the second light beam into a third light beam and a fourth light beam;
the third light beam sequentially passes through the first bandpass filter and the delay light path, and the delay light path is used for delaying the third light beam;
The fourth light beam sequentially passes through the second bandpass filter and the frequency doubling crystal, and the frequency doubling crystal is used for frequency doubling the fourth light beam;
the third light beam and the fourth light beam reach time coincidence at the first polarization spectroscope;
The number of the half-wave plates is one or more, and the half-wave plates are used for adjusting the polarization direction of the light beam passing through the first polarization spectroscope;
the second polarization spectroscope is used for beating the light beam passing through the half-wave plate to obtain a carrier envelope offset frequency signal; and
The photoelectric detector is used for converting the carrier envelope offset frequency signal output by the second polarization spectroscope into the electric signal and feeding the electric signal back to the signal generator.
Optionally, the delay optical path includes a delay fiber.
Optionally, the photodetector comprises an avalanche photodiode.
(III) beneficial effects
The embodiment of the disclosure provides a broadband tunable low-noise electro-optical frequency comb generating device, which is used for electro-optically modulating a tunable narrow linewidth laser to realize fine optical comb output with tunable center wavelength, wherein a polarization modulator and a phase modulator are adopted, and more degrees of freedom are introduced to control the shape of an optical frequency comb; the precise and arbitrary adjustment of the comb teeth space frequency is realized by utilizing the characteristic that the frequency of the microwave signal generator is precisely adjustable; the sinusoidal signals and the frequency multiplication signals thereof are adopted to respectively drive the two cascaded modulators, so that the comb tooth bandwidth is widened, and the improvement of flatness is realized; the frequency spectrum is widened by adopting a high nonlinear optical waveguide, so that the frequency spectrum reaches an octave; the optical filter cavity is adopted to filter the generated optical frequency comb signals, so that phase noise is reduced; and an f-2f unit is adopted to measure carrier envelope offset frequency and is combined with a feedback circuit to regulate a sinusoidal signal, so that the stability of the optical frequency comb is improved. Compared with the optical frequency comb generating device adopting the existing electro-optic modulation method, the broadband tunable low-noise electro-optic frequency comb generating device disclosed by the invention has the advantages of large bandwidth, tunability, high stability, low phase noise and the like.
Drawings
Fig. 1 schematically illustrates a structural schematic of a broadband tunable low-noise electro-optic frequency comb generating device according to an embodiment of the present disclosure.
Fig. 2 schematically illustrates a schematic of the structure of an "f-2f" unit of a broadband tunable low-noise electro-optic frequency comb generating device according to an embodiment of the present disclosure.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.
The existing optical frequency comb generation scheme, such as Kerr effect of microcavity, mode-locked fiber laser, etc., has the disadvantages of high phase noise or non-tunable, narrow bandwidth, etc. The requirements of people on high stability, low noise, large bandwidth and the like of the optical frequency comb cannot be met.
To solve at least one of the above technical problems occurring in the optical frequency comb in the prior art, an embodiment of the present disclosure provides a broadband tunable low-noise electro-optical frequency comb generating device for generating an optical frequency comb with large bandwidth, tunability, high stability and low phase noise.
An embodiment of the present disclosure shows a structure of a broadband tunable low-noise electro-optic frequency comb generating device, and the structure of the device is described in detail with reference to fig. 1.
A broadband tunable electro-optic frequency comb generating device is used for generating an optical frequency comb with large bandwidth, high tuning stability and low phase noise, and comprises a tunable narrow linewidth laser, a first polarization controller, a polarization modulator, a second polarization controller, an electro-optic phase modulator, an optical amplifier, a high nonlinear optical waveguide, an optical filtering cavity, a beam splitting coupler, an f-2f unit, a signal generator, a microwave power distributor, a phase shifter, a first broadband microwave power amplifier, a microwave frequency multiplier and a second broadband microwave power amplifier.
In this embodiment, the tunable narrow linewidth laser generates a stable continuous light with a tunable wavelength range, and the continuous light with the tunable wavelength range sequentially passes through the first polarization controller, the polarization modulator, the second polarization controller, the electro-optic phase modulator, the optical amplifier, the high nonlinear optical waveguide, the optical filter cavity and the optical splitting coupler, and is split into a first light beam and a second light beam by the optical splitting coupler, where the first light beam is directly output, the second light beam passes through the "f-2f" unit, and the "f-2f" unit converts the second light beam from an optical signal into an electrical signal and feeds the electrical signal back to the signal generator.
In this embodiment, the signal generator generates a sinusoidal microwave signal, the microwave power divider divides the microwave signal into a first microwave signal and a second microwave signal, the first microwave signal sequentially passes through the phase shifter and the first wideband microwave power amplifier and then is input to the polarization modulator, and the second microwave signal sequentially passes through the microwave frequency multiplier and the second wideband microwave power amplifier and then is input to the electro-optic phase modulator.
In this embodiment, the first polarization controller and the second polarization controller adjust the polarization state of the continuous light with tunable wavelength range; the polarization modulator and the continuous optical modulation with the tunable wavelength range generate an electro-optic frequency comb, the electro-optic frequency comb can be equivalent to the effect of an intensity modulator or a phase modulator in output, and after passing through the cascaded electro-optic phase modulator, comb teeth with narrower bandwidth are generated; the high-nonlinearity optical waveguide is used for widening the frequency spectrum of the continuous light with the tunable wavelength range to one octave; and the optical filter cavity is used for filtering and reducing phase noise.
In this embodiment, the tunable narrow linewidth laser includes one of a semiconductor laser in a tunable wavelength form and a fiber laser in a tunable wavelength form.
In this embodiment, the tunable narrow linewidth laser includes a pre-stabilizing unit, where the pre-stabilizing unit is configured to pre-stabilize the continuous light with the tunable wavelength range.
In this embodiment, the electro-optic phase modulator comprises a lithium niobate phase modulator.
In this embodiment, the light polarization direction of the continuous light output by the tunable narrow linewidth laser and having a tunable wavelength range is any direction.
In this embodiment, the first polarization controller and the second polarization controller adjust the light polarization direction to the light polarization direction with the best modulation efficiency.
In this embodiment, the signal generator includes one of a microwave signal generator and a high-speed pulse signal generator.
In this embodiment, the high-nonlinearity optical waveguide includes one of a photonic crystal fiber, a microstructure fiber and a single-mode fiber with a fused taper, and the nonlinear coefficient of the high-nonlinearity optical waveguide is not less than 10w -1km-1.
In this embodiment, the optical amplifier includes one of an erbium-doped fiber amplifier and a semiconductor optical amplifier.
An embodiment of the present disclosure shows a schematic structure of an "f-2f" unit of a broadband tunable low-noise electro-optic frequency comb generating device, and the structure of the device is described in detail with reference to fig. 2.
The "f-2f" unit includes: the device comprises a light splitting coupler, a first band-pass filter, a second band-pass filter, a delay fiber, a frequency doubling crystal, a first polarization spectroscope, a half wave plate, a second polarization spectroscope and an avalanche photodiode.
In this embodiment, the optical splitting coupler is configured to split the second light beam into a third light beam and a fourth light beam; the third light beam sequentially passes through the first bandpass filter and the delay optical fiber, and the delay optical fiber is used for delaying the third light beam; the fourth light beam sequentially passes through the second bandpass filter and the frequency doubling crystal, and the frequency doubling crystal is used for frequency doubling the fourth light beam; the third light beam and the fourth light beam reach time coincidence at the first polarization spectroscope; the number of the half-wave plates is one or more, and the half-wave plates are used for adjusting the polarization direction of the light beam passing through the first polarization spectroscope; the second polarization spectroscope is used for beating the light beam passing through the half-wave plate to obtain a carrier envelope offset frequency signal; and the avalanche photodiode is used for converting the carrier envelope offset frequency signal output by the second polarization spectroscope into the electric signal and feeding the electric signal back to the signal generator through a phase-locked loop feedback circuit.
The disclosure is not limited to the use of the "f-2f" unit structure in the above embodiments, and any device known in the art that can achieve f-2f self-referencing is suitable for use in the present invention.
Thus, embodiments of the present disclosure have been described in detail with reference to the accompanying drawings.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are more fully described herein with reference to the accompanying drawings, in which the principles of the present invention are shown and described, and in which the general principles of the invention are defined by the appended claims.
Claims (10)
1. A broadband tunable electro-optic frequency comb generating device, comprising:
The tunable narrow linewidth laser comprises a tunable narrow linewidth laser, a first polarization controller, a polarization modulator, a second polarization controller, an electro-optic phase modulator, an optical amplifier, a high nonlinear optical waveguide, an optical filter cavity, a beam splitting coupler, an 'f-2 f' unit, a signal generator, a microwave power divider, a phase shifter, a first broadband microwave power amplifier, a microwave frequency multiplier and a second broadband microwave power amplifier;
The tunable narrow linewidth laser generates stable continuous light with a tunable wavelength range, the continuous light with the tunable wavelength range sequentially passes through the first polarization controller, the polarization modulator, the second polarization controller, the electro-optic phase modulator, the optical amplifier, the high nonlinear optical waveguide, the optical filter cavity and the optical splitting coupler, and is divided into a first light beam and a second light beam by the optical splitting coupler, wherein the first light beam is directly output, the second light beam passes through the f-2f unit, the f-2f unit converts the second light beam from an optical signal into an electric signal, and the electric signal is fed back to the signal generator;
The signal generator generates a microwave signal, the microwave power distributor divides the microwave signal into a first microwave signal and a second microwave signal, the first microwave signal is input into the polarization modulator after sequentially passing through the phase shifter and the first broadband microwave power amplifier, and the second microwave signal is input into the electro-optic phase modulator after sequentially passing through the microwave frequency multiplier and the second broadband microwave power amplifier;
The first polarization controller and the second polarization controller adjust the polarization state of the continuous light with tunable wavelength range;
the polarization modulator and the electro-optic phase modulator generate electro-optic frequency combs for continuous optical modulation with tunable wavelength ranges;
the high-nonlinearity optical waveguide widens the frequency spectrum of the continuous light with the tunable wavelength range to one octave;
the optical filtering cavity is used for filtering and reducing phase noise; and
The "f-2f" unit is used for realizing f-2f self-reference.
2. The apparatus of claim 1, wherein the tunable narrow linewidth laser comprises one of a semiconductor laser in tunable wavelength form and a fiber laser in tunable wavelength form.
3. The apparatus of claim 1 or 2, wherein the tunable narrow linewidth laser comprises a pre-stabilizing unit for pre-stabilizing the continuous light tunable to the wavelength range.
4. The apparatus of claim 1 or 2, wherein the electro-optic phase modulator comprises a lithium niobate phase modulator.
5. The apparatus of claim 1 or 2, wherein:
The continuous light which is output by the tunable narrow linewidth laser and has tunable wavelength range has any light polarization direction;
the first polarization controller and the second polarization controller adjust the light polarization direction to the light polarization direction with the optimal modulation efficiency.
6. The apparatus of claim 1 or 2, wherein the signal generator comprises one of a microwave signal generator and a high-speed pulse signal generator.
7. The apparatus of claim 1 or 2, wherein the highly nonlinear optical waveguide comprises one of a photonic crystal fiber, a microstructured fiber, and a fusion tapered single mode fiber.
8. The apparatus of claim 1 or 2, wherein the optical amplifier comprises one of an erbium doped fiber amplifier and a semiconductor optical amplifier.
9. The apparatus of claim 1 or 2, wherein the "f-2f" unit comprises:
The device comprises a light splitting coupler, a first bandpass filter, a second bandpass filter, a delay light path, a frequency doubling crystal, a first polarization spectroscope, a half wave plate, a second polarization spectroscope and a photoelectric detector;
The light splitting coupler is used for splitting the second light beam into a third light beam and a fourth light beam;
the third light beam sequentially passes through the first bandpass filter and the delay light path, and the delay light path is used for delaying the third light beam;
The fourth light beam sequentially passes through the second bandpass filter and the frequency doubling crystal, and the frequency doubling crystal is used for frequency doubling the fourth light beam;
the third light beam and the fourth light beam reach time coincidence at the first polarization spectroscope;
The number of the half-wave plates is one or more, and the half-wave plates are used for adjusting the polarization direction of the light beam passing through the first polarization spectroscope;
the second polarization spectroscope is used for beating the light beam passing through the half-wave plate to obtain a carrier envelope offset frequency signal; and
The photoelectric detector is used for converting the carrier envelope offset frequency signal output by the second polarization spectroscope into the electric signal, and the electric signal is fed back to the signal generator through a feedback circuit.
10. The apparatus of claim 9, wherein:
the delay light path comprises a delay optical fiber; and/or
The photodetector includes an avalanche photodiode.
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| CN202410101809.7A CN118011704A (en) | 2024-01-24 | 2024-01-24 | Broadband tunable electro-optic frequency comb generating device |
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| CN202410101809.7A CN118011704A (en) | 2024-01-24 | 2024-01-24 | Broadband tunable electro-optic frequency comb generating device |
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