CN109600168B - Multifunctional signal source based on photonic integrated chip and operation method - Google Patents
Multifunctional signal source based on photonic integrated chip and operation method Download PDFInfo
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- CN109600168B CN109600168B CN201811538968.4A CN201811538968A CN109600168B CN 109600168 B CN109600168 B CN 109600168B CN 201811538968 A CN201811538968 A CN 201811538968A CN 109600168 B CN109600168 B CN 109600168B
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Abstract
The present disclosure provides a multifunctional signal source based on a photonic integrated chip and an operating method thereof, the multifunctional signal source based on the photonic integrated chip comprises: the device comprises a photonic integrated chip, an optical feedback loop, a photoelectric oscillation loop and an arbitrary waveform generator; wherein the photonic integrated chip comprises: an amplified feedback laser and a detector. According to the multifunctional signal source based on the photonic integrated chip and the operation method, on the photonic integrated chip, the detector directly converts a high-quality optical carrier microwave signal, a chirp laser signal and a broadband chaotic signal generated by an amplification feedback laser into an electric domain signal on the chip to be output, and integrates an active photonic device required in a photoelectric oscillator system on the same chip, so that the multifunctional signal source based on the photonic integrated chip has the advantages of compact structure, good stability, convenience in packaging, further cost reduction and the like.
Description
Technical Field
The disclosure relates to the technical field of microwave photon signal generation, in particular to a multifunctional signal source based on a photon integrated chip and an operation method.
Background
The frequency-tunable low-phase-noise high-quality microwave signal, the chirp microwave signal with large time bandwidth product and the broadband chaotic signal have important application in radar systems, satellite communication systems and modern remote sensing measurement systems. At present, high-frequency microwave signals are mainly generated by mixing crystalsThe oscillation frequency is obtained by frequency multiplication, although the crystal oscillation can obtain high-quality microwave signals (the phase noise at the frequency offset of 1kHz is lower than-140 dBc/Hz), the fundamental frequency of the crystal oscillation is often lower than hundred MHz, multiple times of frequency multiplication are needed to obtain high-frequency microwave signals, the frequency multiplication is improved by N times, and the phase noise is deterioratedIt is difficult to obtain a high frequency microwave signal with low phase noise by crystal oscillation frequency multiplication. The phase noise of the microwave signal generated by the photoelectric oscillator is irrelevant to the oscillation frequency, and the photoelectric oscillator can be used for obtaining a high-frequency microwave signal with extremely low phase noise. The chirped microwave signal is generally generated by an electronics-based method, but is limited by electronics bottleneck, a broadband chirped microwave signal with a large bandwidth (more than 10GHz) is difficult to obtain, and a photonics-based method has great advantages in bandwidth and tuning performance. The broadband chaotic optical signal is mainly generated based on an optical feedback method, the bandwidth of the chaotic signal obtained by single-mode self-feedback injection is often lower (less than 20GHz), and the chaotic laser signal with larger bandwidth can be obtained by adopting optical heterodyne injection, but the system needs two lasers and has a complex structure. In practical application, the frequency-adjustable microwave signal, the chirped microwave signal and the broadband chaotic signal need to be generated by different systems, the system cost is high, and a multifunctional signal source is urgently needed to generate the three signals.
BRIEF SUMMARY OF THE PRESENT DISCLOSURE
Technical problem to be solved
Based on the technical problems, the present disclosure provides a multifunctional signal source based on a photonic integrated chip and an operating method thereof, so as to alleviate the technical problems in the prior art that a frequency-adjustable microwave signal, a chirp microwave signal and a broadband chaotic signal need to be generated by different systems, and the system cost is high.
(II) technical scheme
According to an aspect of the present disclosure, there is provided a multifunctional signal source based on a photonic integrated chip for outputting a frequency-adjustable microwave signal, a chirped microwave signal, and a chaotic signal, including: the device comprises a photonic integrated chip, an optical feedback loop, a photoelectric oscillation loop and an arbitrary waveform generator; the photonic integrated chip includes: the device comprises an amplification feedback laser and a detector, wherein the amplification feedback laser outputs a microwave optical signal with adjustable frequency and a chirped microwave optical signal when working in a narrow-linewidth dual-mode state, and outputs a chaotic optical signal when working in a broadband chaotic state; the detector receives the optical signal output by the amplification feedback laser and converts the optical signal into a corresponding electrical signal; the optical feedback loop is used for feeding back an optical signal emitted by the amplification feedback laser to the amplification feedback laser so as to enable the amplification feedback laser to work in a narrow-linewidth dual-mode state or a broadband chaotic state; the photoelectric oscillation loop is used for amplifying and outputting the electric signal converted by the detector, and modulating the amplified electric signal on the amplification feedback laser when the amplification feedback laser works in a narrow line width dual-mode state; the arbitrary waveform generator is connected with the amplification feedback laser and used for providing an electric signal which changes along with time when the amplification feedback laser works in a narrow line width dual-mode state.
In some embodiments of the present disclosure, the amplified feedback laser is divided into: a distributed feedback laser region, a phase adjustment region and an amplification feedback region; the distributed feedback type laser area is connected with the detector; the phase adjusting area is connected with the distributed feedback type laser area; the amplification feedback area is connected with the phase adjusting area and is connected with the arbitrary waveform generator; the random waveform generator is connected with the amplification feedback area, the phase adjustment area and the amplification feedback area form an integrated feedback cavity, so that the amplification feedback area works in a dual-mode state and a chaotic state, and the dual-mode distance of the amplification feedback area is increased along with the increase of the injection current of the amplification feedback area.
In some embodiments of the present disclosure, the optical feedback loop sequentially includes, along the optical signal transmission direction: the optical coupler comprises a three-port circulator, a single-mode optical fiber, an optical coupler, an optical adjustable attenuator and a polarization controller; the three-port circulator is connected with the amplification feedback area and used for receiving the dual-mode optical signal excited by the amplification feedback area and transmitting the received optical signal back to the amplification feedback area to ensure the single-line transmission of the optical signal; the single-mode optical fiber is connected with the three-port circulator and used for improving the Q value of the optical feedback loop; the optical coupler is connected with the single-mode optical fiber and used for receiving the optical signal output by the single-mode optical fiber and dividing the optical signal into two parts according to a preset optical power distribution ratio, wherein part of the optical signal is sent into the optical adjustable attenuator, and part of the optical signal is output; the optical adjustable attenuator is connected with the optical coupler and used for adjusting the optical power injected back to the amplification feedback area so that the amplification feedback area works in a narrow-linewidth dual-mode state or a broadband chaotic state; and the polarization controller is connected with the optical adjustable attenuator and the three-port circulator and is used for adjusting the polarization state of the received optical signal to be matched with the polarization state of the laser light in the amplification feedback area.
In some embodiments of the present disclosure, the optical feedback loop sequentially includes, along the optical signal transmission direction: the optical isolator comprises an optical isolator, a single-mode optical fiber, an optical coupler, an optical adjustable attenuator and a polarization controller; the optical isolator is connected with the amplification feedback area and prevents emergent light of the detector from being fed back to the amplification feedback area; the single-mode optical fiber is connected with the optical isolator and used for improving the Q value of the optical feedback loop; the optical coupler is connected with the single-mode optical fiber and used for receiving the optical signal output by the single-mode optical fiber and dividing the optical signal into two parts according to a preset optical power distribution ratio, and partial optical power is sent to the optical adjustable attenuator and output; the optical adjustable attenuator is connected with the optical coupler and used for adjusting the optical power injected back to the amplification feedback area so that the amplification feedback area works in a narrow-linewidth dual-mode state or a broadband chaotic state; and the polarization controller is connected with the optical adjustable attenuator and the detector and is used for adjusting the polarization state of the received optical signal to be matched with the polarization state of the laser light in the amplification feedback area.
In some embodiments of the present disclosure, the single mode optical fiber has a length between 10 meters and 10 kilometers.
In some embodiments of the present disclosure, the preset optical power distribution ratio of the optical coupler is 99: 1; wherein 99% of the optical power is sent to the optical adjustable attenuator, and 1% of the optical power is output.
In some embodiments of the present disclosure, 1% of the optical power is output to a spectrometer for testing.
In some embodiments of the present disclosure, the optoelectronic oscillation circuit sequentially includes, along an electrical signal transmission direction: the microwave power divider comprises a microwave amplifier, a microwave power divider and a switch; the microwave amplifier is connected with the detector and used for receiving the electric signal generated by converting the optical signal by the detector and amplifying the electric signal according to a preset amplification factor; the microwave power divider is connected with the microwave amplifier and used for receiving the electric signals amplified by the microwave amplifier, dividing the power according to a preset power distribution ratio, sending part of the electric signals into the distributed feedback laser area and outputting part of the electric signals; the switch is arranged between the microwave power divider and the distributed feedback type laser area and used for switching on and switching off the modulation signal modulated in the distributed feedback type laser area.
In some embodiments of the present disclosure, the material structure of the probe includes: a single-row carrier detector material structure, a PIN type material structure or an active multiple quantum well material structure.
According to another aspect of the present disclosure, there is also provided an operating method of a photonic integrated chip based multifunctional signal source, for operating the photonic integrated chip based multifunctional signal source provided by the present disclosure, including:
adding proper bias current in each area of the amplification feedback laser, adjusting the optical adjustable attenuator, compressing the line width of the amplification feedback laser to enable the amplification feedback laser to work in a narrow line width dual-mode state, closing a switch to form a photoelectric oscillation loop, and simultaneously adjusting the injection current of the amplification feedback area to output a microwave signal with adjustable frequency through the photoelectric oscillation loop;
adding proper bias current to each area of the amplification feedback laser, adjusting the optical adjustable attenuator, compressing the line width of the amplification feedback laser to enable the amplification feedback laser to work in a narrow line width dual-mode state, closing a switch to form a photoelectric oscillation loop, opening an arbitrary waveform generator, applying an electric signal which changes along with time to an amplification feedback area, enabling the mode interval of a dual-mode optical signal to change along with the applied electric signal, generating a chirp laser signal, and outputting a chirp microwave signal through the photoelectric oscillation loop;
and adding proper bias current to each area of the amplification feedback laser, disconnecting the switch, and adjusting the optical adjustable attenuator to enable the amplification feedback laser to work in a broadband chaotic state to generate chaotic optical signals, thereby outputting the chaotic signals.
(III) advantageous effects
According to the technical scheme, the multifunctional signal source based on the photonic integrated chip and the operation method have one or part of the following beneficial effects:
(1) under the action of an optical feedback loop, when the amplification feedback laser works in a narrow linewidth dual-mode state: the system can be used as a photoelectric oscillator by switching on the photoelectric feedback loop, and a high-quality optical carrier microwave signal with tunable frequency can be generated by adjusting the injection current of the amplification feedback area; the chirp laser signal can be obtained by opening an arbitrary waveform generator to apply an electrical signal which changes along with time on an amplification feedback laser;
(2) under the action of the optical feedback loop, when the amplification feedback laser works in a broadband chaotic state, the switch feedback loop is disconnected and the arbitrary waveform generator is closed, so that a broadband chaotic optical signal can be obtained;
(3) according to the multifunctional signal source of the photonic integrated chip, the external modulator is replaced by the directly modulated semiconductor laser, and the amplification feedback laser is used as the microwave photonic filter to work in the photoelectric oscillation loop, so that the structure is compact and simplified, the power consumption and the cost are greatly reduced, the working stability is improved, and the tuning mode is simple;
(4) on the photonic integrated chip, the detector directly converts the high-quality optical microwave signal, the chirped laser signal and the broadband chaotic signal generated by the amplification feedback laser into an electric domain signal on the chip for output, and integrates an active photonic device required in a photoelectric oscillator system on the same chip, so that the photonic integrated chip has the advantages of compact structure, good stability, convenience in packaging, further cost reduction and the like;
(5) the amplification feedback laser is used as a microwave photon filter to work in a photoelectric oscillator system, and has the advantages of high working frequency, narrow pass band and wide tuning range, the dual-mode spacing of the existing amplification feedback laser covers the range of 7-50GHz and has the frequency tuning range of 10-20GHz, when the amplification feedback laser runs freely, the 3dB bandwidth of a microwave signal generated by dual-mode beat frequency is about 4MHz, when the optical feedback works in a dual-mode narrow line width state, the 3dB bandwidth of the microwave signal generated by beat frequency can be as narrow as kHz or even sub kHz magnitude, and the amplification feedback laser is used as the microwave photon filter to realize high-quality microwave output;
(6) the dual-mode spacing is adjusted by adjusting the injection current of the amplification feedback area, so that the method has the advantage of high tuning efficiency, can realize a wide dual-mode spacing tuning range in a smaller voltage tuning range, and outputs a chirped microwave signal with a large time-bandwidth product;
(7) the amplification feedback laser can work in a broadband chaotic state under the condition of external light injection, and the chaotic standard bandwidth of the amplification feedback laser can reach 35 GHz;
(8) when a switch of the photoelectric oscillation loop is closed to be used as a photoelectric oscillator, the fed-back frequency tunable microwave signal and the chirped microwave signal are directly modulated on the distributed feedback type laser area, so that the use of an external modulator is eliminated;
(9) when a switch of the photoelectric oscillation loop is closed to be used as a photoelectric oscillator, an electric signal generated by the beat frequency of the dual-mode laser is used as an oscillation seed source and is used as a microwave photon filter to work in the photoelectric oscillation loop.
Drawings
Fig. 1 is a schematic structural diagram of a multifunctional signal source based on a photonic integrated chip according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of another multifunctional signal source based on a photonic integrated chip according to an embodiment of the present disclosure.
Detailed Description
The multifunctional signal source based on the photonic integrated chip and the operation method thereof provided by the disclosure are on the photonic integrated chip, the detector directly converts the high-quality optical carrier microwave signal, the chirped laser signal and the broadband chaotic signal generated by the amplification feedback laser into the electric domain signal on the chip to be output, and the active photonic device required in the photoelectric oscillator system is integrated on the same chip, so that the multifunctional signal source based on the photonic integrated chip and the operation method thereof have the advantages of compact structure, good stability, convenience in packaging, further cost reduction and the like.
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
According to an aspect of the present disclosure, there is provided a multifunctional signal source based on a photonic integrated chip, for outputting a frequency-tunable microwave signal, a chirped microwave signal, and a chaotic signal, as shown in fig. 1 to 2, including: a photonic integrated chip, an optical feedback loop, an optoelectronic oscillation loop, and an arbitrary waveform generator.
In some embodiments of the present disclosure, a photonic integrated chip, comprises: amplifying the feedback laser and the detector; when the amplification feedback laser works in a narrow-linewidth dual-mode state, the system serves as a photoelectric oscillator to output a frequency-adjustable optical carrier microwave signal and a chirp laser signal, meanwhile, the amplification feedback laser can serve as a microwave photon filter to replace a filter in a loop, the feedback microwave signal is directly modulated in a distributed feedback laser area, and an external modulator is not needed in the photoelectric oscillation loop. The amplification feedback laser and the detector are integrated on the same photonic chip, so that the photoelectric oscillator system does not need other active photonic devices, the system structure of the photoelectric oscillator is simplified, and the amplification feedback laser outputs chaotic optical signals when the amplification feedback laser works in a broadband chaotic state; the detector receives the optical signal output by the amplified feedback laser on the chip and converts the optical signal into a corresponding electrical signal.
In some embodiments of the present disclosure, the optical feedback loop is configured to feed back an optical signal emitted by the amplification feedback laser to the large feedback laser, so that the large feedback laser operates in a narrow linewidth dual-mode state or a broadband chaotic state; the photoelectric oscillation loop is used for amplifying and outputting the electric signal converted by the detector, and modulating the amplified electric signal on the amplification feedback laser when the amplification feedback laser works in a narrow-linewidth dual-mode state; the arbitrary waveform generator is connected with the amplification feedback laser and is used for providing an electric signal which changes along with time when the amplification feedback laser works in a narrow line width dual-mode state.
Under the action of the optical feedback loop, when the amplification feedback laser works in a narrow linewidth dual-mode state: the system can be used as a photoelectric oscillator by switching on the photoelectric feedback loop, and a high-quality optical carrier microwave signal with tunable frequency can be generated by adjusting the injection current of the amplification feedback area; the chirp laser signal can be obtained by opening an arbitrary waveform generator to apply an electrical signal which changes along with time on an amplification feedback laser; when the amplification feedback laser works in a broadband chaotic state, a switch feedback loop is disconnected and an arbitrary waveform generator is closed, so that a broadband chaotic optical signal can be obtained.
According to the multifunctional signal source of the photonic integrated chip provided by the embodiment of the disclosure, the external modulator is replaced by the directly modulated semiconductor laser, and the amplification feedback laser works in the photoelectric oscillation loop as the microwave photonic filter, so that the structure is compact and simplified, the power consumption and the cost are greatly reduced, the working stability is improved, and the tuning mode is simple; on the photonic integrated chip, the detector directly converts the high-quality optical microwave signal, the chirped laser signal and the broadband chaotic signal generated by the amplification feedback laser into an electric domain signal for output, and integrates an active photonic device required in a photoelectric oscillator system on the same chip, so that the photonic integrated chip has the advantages of compact structure, good stability, convenience in packaging, further cost reduction and the like.
In some embodiments of the present disclosure, as shown in fig. 1-2, the amplified feedback laser is divided into: a distributed feedback laser region, a phase adjustment region and an amplification feedback region; the distributed feedback type laser area is connected with the detector; the phase adjusting area is connected with the distributed feedback type laser area and is used for controlling the phase of feedback light; the amplification feedback area is connected with the phase adjusting area and is used for controlling the intensity of feedback light so as to control the mode spacing; the random waveform generator is connected with the amplification feedback area, the phase adjustment area and the amplification feedback area form an integrated feedback cavity, so that the amplification feedback area works in a dual-mode state and a chaotic state, and the dual-mode spacing of the amplification feedback laser is increased along with the increase of the injection current of the amplification feedback area.
In some embodiments of the present disclosure, as shown in fig. 1, the optical feedback loop sequentially includes, along the optical signal transmission direction: the optical coupler comprises a three-port circulator, a single-mode optical fiber, an optical coupler, an optical adjustable attenuator and a polarization controller; the three-port circulator is connected with the amplification feedback area and used for receiving the dual-mode optical signal excited by the amplification feedback area and transmitting the received optical signal back to the amplification feedback area to ensure single-line transmission of the optical signal; the single mode fiber is connected with the three-port circulator and is used for improving the Q value of the optical feedback loop; the optical coupler is connected with the single-mode optical fiber and used for receiving the optical signal output by the single-mode optical fiber and dividing the optical signal into two parts according to a preset optical power distribution ratio, wherein part of the optical signal is sent into the optical adjustable attenuator, and part of the optical signal is output; the optical adjustable attenuator is connected with the optical coupler and used for adjusting the optical power injected into the playback large feedback area so that the amplification feedback area works in a narrow-line-width dual-mode state or a broadband chaotic state; the polarization controller is connected with the optical adjustable attenuator and the three-port circulator and is used for adjusting the polarization state of the received optical signal to be matched with the polarization state of the laser light in the amplification feedback area.
In some embodiments of the present disclosure, the optical feedback loop may also be formed by coupling laser light in the amplification feedback region to the detector through an optical fiber, as shown in fig. 2, the laser light is coupled from the amplification feedback region, the loop Q value is improved through a single-mode optical fiber, and then the laser light is coupled into the amplification feedback laser through the detector end, and the optical feedback loop sequentially includes along the optical signal transmission direction: the optical isolator comprises an optical isolator, a single-mode optical fiber, an optical coupler, an optical adjustable attenuator and a polarization controller; the optical isolator is connected with the amplification feedback area and used for ensuring the one-way feedback of the optical feedback loop and preventing the emergent light of the detector from being fed back to the amplification feedback area; the single-mode optical fiber is connected with the optical isolator and used for improving the Q value of the optical feedback loop; the optical coupler is connected with the single-mode optical fiber and used for receiving the optical signal output by the single-mode optical fiber and dividing the optical signal into two parts according to a preset optical power distribution ratio, wherein part of the optical power is sent to the optical adjustable attenuator, and part of the optical power is output; the optical adjustable attenuator is connected with the optical coupler and used for adjusting the optical power injected into the playback large feedback area so that the amplification feedback area works in a narrow-line-width dual-mode state or a broadband chaotic state; the polarization controller is connected with the optical adjustable attenuator and the detector and is used for adjusting the polarization state of the received optical signal to be matched with the polarization state of the laser light in the amplification feedback area.
In some embodiments of the present disclosure, the length of the single mode fiber is between 10 meters and 10 kilometers.
In some embodiments of the present disclosure, the preset optical power distribution ratio of the optical coupler is 99: 1; wherein 99% of the optical power is sent into the optical adjustable attenuator, and 1% of the optical power is output to the spectrometer for testing.
In some embodiments of the present disclosure, as shown in fig. 1 to 2, the optoelectronic oscillation loop sequentially includes, along the electrical signal transmission direction: the microwave power divider comprises a microwave amplifier, a microwave power divider and a switch; the microwave amplifier is connected with the detector and used for receiving the electric signal generated by the optical signal converted by the detector and amplifying the electric signal according to a preset amplification factor, so that the microwave gain of the photoelectric oscillation system is greater than an oscillation threshold value to form stable microwave oscillation; the microwave power divider is connected with the microwave amplifier and used for receiving the electric signals amplified by the microwave amplifier and distributing electric power according to a preset power distribution ratio, part of the electric signals are sent to the distributed feedback type laser area, and part of the electric signals are output; the switch is arranged between the microwave power divider and the distributed feedback type laser area and used for switching on and switching off the modulation signal modulated in the distributed feedback type laser area.
In some embodiments of the present disclosure, the material structure of the probe includes: a single-row carrier detector material structure, a PIN type material structure or an active multiple quantum well material structure.
According to another aspect of the present disclosure, there is also provided an operating method of a photonic integrated chip based multifunctional signal source, for operating the photonic integrated chip based multifunctional signal source provided by the embodiments of the present disclosure, including:
adding proper bias current in each area of the amplification feedback laser, adjusting the optical adjustable attenuator, compressing the line width of the amplification feedback laser to enable the amplification feedback laser to work in a narrow line width dual-mode state, closing a switch to form a photoelectric oscillation loop, and simultaneously adjusting the injection current of the amplification feedback area to output a microwave signal with adjustable frequency through the photoelectric oscillation loop;
adding proper bias current to each area of the amplification feedback laser, adjusting the optical adjustable attenuator, compressing the line width of the amplification feedback laser to enable the amplification feedback laser to work in a narrow line width dual-mode state, closing a switch to form a photoelectric oscillation loop, opening an arbitrary waveform generator, applying an electric signal which changes along with time to an amplification feedback area, enabling the mode interval of a dual-mode optical signal to change along with the applied electric signal, generating a chirp laser signal, and outputting a chirp microwave signal through the photoelectric oscillation loop;
and adding proper bias current to each area of the amplification feedback laser, disconnecting the switch, and adjusting the optical adjustable attenuator to enable the amplification feedback laser to work in a broadband chaotic state to generate chaotic optical signals, thereby outputting the chaotic signals.
When a switch of the photoelectric oscillation loop is closed to be used as a photoelectric oscillator, the fed-back frequency tunable microwave signal and the chirped microwave signal are directly modulated on the distributed feedback type laser area, so that the use of an external modulator is eliminated; meanwhile, an electric signal generated by the double-mode laser beat frequency is used as an oscillation seed source and is used as a microwave photon filter to work in a photoelectric oscillation loop.
From the above description, those skilled in the art should clearly recognize that the photonic integrated chip based multifunctional signal source and the operating method provided by the embodiments of the present disclosure are provided.
In summary, the multifunctional signal source based on the photonic integrated chip and the operating method provided by the disclosure integrate the amplification feedback laser and the detector on the photonic integrated chip, the detector directly converts the high-quality optical carrier microwave signal, the chirp laser signal and the broadband chaotic signal generated by the amplification feedback laser into the electric domain signal on the chip for output, and integrates the active photonic devices required in the optoelectronic oscillator system on the same chip, so that the multifunctional signal source based on the photonic integrated chip has the advantages of compact structure, good stability, convenience in packaging, further cost reduction and the like.
It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure.
And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (9)
1. A multifunctional signal source based on a photonic integrated chip is used for outputting microwave signals with adjustable frequency, chirped microwave signals and chaotic signals, and comprises:
a photonic integrated chip, comprising:
the amplification feedback laser outputs a microwave optical signal with adjustable frequency and a chirped microwave optical signal when working in a narrow-linewidth dual-mode state, and outputs a chaotic optical signal when working in a broadband chaotic state; the amplification feedback laser comprises: the distributed feedback type laser area is connected with the detector; a phase adjustment region connected to the distributed feedback laser region; the amplification feedback area is connected with the phase adjusting area and is connected with the arbitrary waveform generator; the phase adjusting area and the amplifying feedback area form an integrated feedback cavity, so that the amplifying feedback area works in a dual-mode state and a chaotic state, and the dual-mode distance of the amplifying feedback area is increased along with the increase of the injection current of the amplifying feedback area;
the detector receives the optical signal output by the amplification feedback laser and converts the optical signal into a corresponding electric signal;
the optical feedback loop is used for feeding back an optical signal emitted by the amplification feedback laser to the amplification feedback laser so as to enable the amplification feedback laser to work in a narrow-linewidth dual-mode state or a broadband chaotic state;
the photoelectric oscillation loop is used for amplifying and outputting the electric signal converted by the detector, and modulating the amplified electric signal on the amplification feedback laser when the amplification feedback laser works in a narrow line width dual-mode state; and
and the arbitrary waveform generator is connected with the amplification feedback laser and is used for providing an electric signal which changes along with time when the amplification feedback laser works in a narrow line width dual-mode state.
2. The photonic integrated chip based multifunctional signal source according to claim 1, wherein the optical feedback loop sequentially comprises, along the optical signal transmission direction:
the three-port circulator is connected with the amplification feedback area and used for receiving the dual-mode optical signal excited by the amplification feedback area and transmitting the received optical signal back to the amplification feedback area to ensure the single-line transmission of the optical signal;
the single-mode optical fiber is connected with the three-port circulator and is used for improving the Q value of the optical feedback loop;
the optical coupler is connected with the single-mode optical fiber and used for receiving the optical signal output by the single-mode optical fiber and dividing the optical signal into two parts according to a preset optical power distribution ratio, wherein part of the optical signal is sent into the optical adjustable attenuator, and part of the optical signal is output;
the optical adjustable attenuator is connected with the optical coupler and used for adjusting the optical power injected back to the amplification feedback area so that the amplification feedback area works in a narrow-linewidth dual-mode state or a broadband chaotic state;
and the polarization controller is connected with the optical adjustable attenuator and the three-port circulator and is used for adjusting the polarization state of the received optical signal to be matched with the polarization state of the laser light of the amplification feedback area.
3. The photonic integrated chip based multifunctional signal source according to claim 1, wherein the optical feedback loop sequentially comprises, along the optical signal transmission direction:
the optical isolator is connected with the amplification feedback area and prevents emergent light of the detector from being fed back to the amplification feedback area;
the single-mode optical fiber is connected with the optical isolator and is used for improving the Q value of the optical feedback loop;
the optical coupler is connected with the single-mode optical fiber and used for receiving the optical signal output by the single-mode optical fiber and dividing the optical signal into two parts according to a preset optical power distribution ratio, wherein part of the optical power is sent to the optical adjustable attenuator and part of the optical power is output;
the optical adjustable attenuator is connected with the optical coupler and used for adjusting the optical power injected back to the amplification feedback area so that the amplification feedback area works in a narrow-linewidth dual-mode state or a broadband chaotic state;
and the polarization controller is connected with the optical adjustable attenuator and the detector and is used for adjusting the polarization state of the received optical signal to be matched with the polarization state of the laser light in the amplification feedback area.
4. The photonic integrated chip based multifunctional signal source according to claim 2 or claim 3, wherein the length of the single mode fiber is between 10 meters and 10 kilometers.
5. The photonic integrated chip based multifunctional signal source according to claim 2 or claim 3, wherein the preset optical power distribution ratio of the optical coupler is 99: 1;
wherein 99% of the optical power is sent to the optical adjustable attenuator, and 1% of the optical power is output.
6. The photonic integrated chip based multifunctional signal source of claim 5, wherein 1% of the optical power is output to a spectrometer for testing.
7. The photonic integrated chip based multifunctional signal source according to claim 1, wherein the optoelectronic oscillation loop sequentially comprises, along the electrical signal transmission direction:
the microwave amplifier is connected with the detector and used for receiving the electric signal generated by converting the optical signal by the detector and amplifying the electric signal according to a preset amplification factor;
the microwave power divider is connected with the microwave amplifier and used for receiving the electric signals amplified by the microwave amplifier, dividing the power according to a preset power distribution ratio, sending part of the electric signals into the distributed feedback laser area and outputting part of the electric signals;
and the switch is arranged between the microwave power divider and the distributed feedback type laser area and used for switching on and off the modulation signal modulated in the distributed feedback type laser area.
8. The photonic integrated chip based multifunctional signal source according to claim 1, wherein the material structure of the detector comprises: a single-row carrier detector material structure, a PIN type material structure or an active multiple quantum well material structure.
9. A method of operating a photonic integrated chip based multifunctional signal source, for operating the photonic integrated chip based multifunctional signal source according to any one of claims 1 to 8, comprising:
adding proper bias current in each area of the amplification feedback laser, adjusting the optical adjustable attenuator, compressing the line width of the amplification feedback laser to enable the amplification feedback laser to work in a narrow line width dual-mode state, closing a switch to form a photoelectric oscillation loop, and simultaneously adjusting the injection current of the amplification feedback area to output a microwave signal with adjustable frequency through the photoelectric oscillation loop;
adding proper bias current to each area of the amplification feedback laser, adjusting the optical adjustable attenuator, compressing the line width of the amplification feedback laser to enable the amplification feedback laser to work in a narrow line width dual-mode state, closing a switch to form a photoelectric oscillation loop, opening an arbitrary waveform generator, applying an electric signal which changes along with time to an amplification feedback area, enabling the mode interval of a dual-mode optical signal to change along with the applied electric signal, generating a chirp laser signal, and outputting a chirp microwave signal through the photoelectric oscillation loop;
and adding proper bias current to each area of the amplification feedback laser, disconnecting the switch, and adjusting the optical adjustable attenuator to enable the amplification feedback laser to work in a broadband chaotic state to generate chaotic optical signals, thereby outputting the chaotic signals.
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