CN112422179A - Reconfigurable optical channel flexible extraction system and method based on comb switching - Google Patents
Reconfigurable optical channel flexible extraction system and method based on comb switching Download PDFInfo
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- CN112422179A CN112422179A CN202011140097.8A CN202011140097A CN112422179A CN 112422179 A CN112422179 A CN 112422179A CN 202011140097 A CN202011140097 A CN 202011140097A CN 112422179 A CN112422179 A CN 112422179A
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Abstract
A reconfigurable optical channel flexible extraction system and method based on comb switching comprises a multi-comb optical frequency comb generation unit, an electro-optical modulator and the like. A multi-comb optical frequency comb with large frequency interval is adopted to modulate broadband radio frequency signals and keep the coherence of the signals; the wideband and narrowband periodic channel division is completed through the integrated design of the on-chip periodic carrier separation and the channel extraction with high coherence, and the deterioration of the separated filtering on the coherence is reduced; two filtering component periods are designed in a differentiated mode, and the generated vernier effect enables channels corresponding to the narrow-band filtering part to be different in the range of each optical comb tooth, namely the optical comb teeth are in one-to-one correspondence with the channel pass bands. The method does not need an additional optical switch matrix or filter response switching with complex phase matching relation, and completes flexible selection of any channel in channelization by means of fast-response non-periodic numerical control optical filtering and table look-up method comb teeth screening, namely, realizes flexible extraction of reconfigurable optical channels.
Description
Technical Field
The invention belongs to the technical field of microwave photon signal processing, and relates to a method and a system for flexibly extracting a reconfigurable optical channel.
Background
The channelizer, also called input multiplexer, is located between the receiver and the high power amplifier, and performs frequency division and filtering (channelizing) on the received, amplified and frequency-converted broadband signal. Then the signals are further amplified by a high-power amplifier, synthesized by an output multiplexer and forwarded. As a narrowband component in a transponder system, the input multiplexer mainly determines the in-band jitter and group delay variation of the communication channel and the channel isolation, and thus determines the distortion and crosstalk characteristics of the channel.
Similarly, in the all-optical signal receiving and processing system, with the increase of the bandwidth of the access signal, the optical input multiplexer has great application value for processing broadband signals and unpredictable signals due to the characteristics of high frequency selectivity, wide adjustability and rapid configuration. In recent years, more and more research is focused on improving the frequency selectivity and the bandwidth of the optical multiplexer. Even so, it is a challenge for photonic signal processing systems to build a high-flexibility channelizer on the order of sub-GHz over a wide frequency band. Up to now, the following categories of optical channelizer structures have been common.
(1) Channel independent filtering direct intensity detection
The single carrier or multi-carrier modulates, shunts or demultiplexes RF into a plurality of channels, and each channel is directly detected in strength after being filtered by a single-channel FBG, a PS-FBG, an F-P cavity and the like.
The disadvantages are as follows: the requirements of the optical filter are narrow bandwidth, good Q factor and good stability of passband wavelength, which is difficult to achieve. And the method can only detect the intensity and can not extract the RF phase information.
(2) Channelized reception based on single optical comb and optical filter
The RF path is similar to 1, RF is modulated to a single carrier, and is shunted and filtered separately, so that channel separation is realized; in addition, a path of LO optical comb is arranged, and the comb tooth interval is equal to the channel interval; an RF circuit and an LO circuit for I/Q down conversion. The advantages are that: the LO optical comb interval is small, and the multi-line LO optical comb is easy to obtain.
The disadvantages are as follows: the requirement on an optical filter is high, and the influence of the separation of radio frequency and a local oscillation channel on the coherence is avoided.
(3) Channelized reception based on dual optical combs and optical filtering
The RF signal is modulated using an optical comb to achieve a replica of the RF signal at multiple wavelengths. Each comb corresponds to one channel, and the processing such as filtering, down-conversion and the like is carried out independently. It can be divided into optical filtering channel division method and direct I/Q down-conversion method.
The disadvantages are as follows: the coherence problem of multi-comb double-optical comb; the requirements on the Q factor and stability of the comb filter are high.
By combining the above analysis of the channelization schemes, the following difficulties can be found in the current implementation of reception: (1) multi-channel, stable light filtering is not easy to implement; coherence problem of multi-comb double-optical comb; (2) the narrow-band filtering phase matching relation is complex, the wavelength response switching is slow, and the agility is general; (3) the fixed port outputs the fixed channel without the output channel selection capability of quick response.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a reconfigurable optical channel flexible extraction system and method based on comb switching, which comprises the following steps: a multi-comb optical frequency comb with large frequency interval is adopted to modulate broadband radio frequency signals and keep the coherence of the signals; the wideband and narrowband periodic channel division is completed through the integrated design of the on-chip periodic carrier separation and the channel extraction with high coherence, and the deterioration of the separated filtering on the coherence is reduced; the periods of the two filtering components are designed in a differentiated mode, and the obtained vernier effect enables channels corresponding to the narrow-band filtering part to be different in the range of each optical comb tooth, namely the optical comb teeth are in one-to-one correspondence with the channel pass bands. The method does not need an additional optical switch matrix or filter response switching with complex phase matching relation, and completes flexible selection of any channel in channelization by means of fast-response non-periodic numerical control optical filtering and table look-up method comb teeth screening, namely, realizes flexible extraction of reconfigurable optical channels.
The purpose of the invention is realized by the following technical scheme: a reconfigurable optical channel flexible extraction system based on comb switching comprises: the system comprises a multi-comb optical frequency comb generating unit, an electro-optical modulator, a non-periodic numerical control optical filter, an on-chip periodic carrier separation and channel extraction unit and a photoelectric detector which are sequentially connected through optical fibers;
the multi-comb optical frequency comb generating unit generates coherent optical frequency combs with the same frequency interval, the electro-optical modulator receives broadband radio-frequency signals and completes modulation of the broadband radio-frequency signals on the optical frequency combs, and the non-periodic numerical control optical filter performs filtering selection on any comb-tooth signals; after the on-chip periodic carrier separation and channel extraction unit carries out carrier and sideband separation on the signals subjected to the numerical control filtering, the frequency response characteristic of the on-chip periodic carrier separation and channel extraction unit is modulated, the signals of any channel are extracted from the sideband signals by controlling comb teeth of the numerical control filtering to be combined with the carrier, finally, channel selection and photoelectric conversion are completed through a photoelectric detector, and the required channel signals are output.
The multi-comb optical frequency comb generating unit comprises a laser, an intensity modulator, a phase modulator, an electric phase shifter, an electric amplifier and a local vibration source;
the vibration source generates a single-frequency signal with power output of more than 15dBm and frequency of X, and the single-frequency signal drives the electric phase shifter and the electric amplifier respectively; the output signal of the electric phase shifter drives the radio frequency port of the intensity modulator, and the output signal of the electric amplifier drives the radio frequency port of the phase modulator; the laser generates a single-frequency optical carrier, and the single-frequency optical carrier is sequentially input into the intensity modulator and the phase modulator in a serial connection mode; by changing the parameters of the electric phase shifter and the electric amplifier, the phase modulator outputs a multi-comb optical comb signal with the frequency interval of X and the power flatness of less than or equal to 5 dB.
The electro-optical modulator receives broadband radio-frequency signals, the multi-comb optical comb signals with the frequency interval of X drive the electro-optical modulator to modulate the broadband radio-frequency signals, and the modulation mode is double-sideband modulation.
The non-periodic numerical control optical filter receives the multi-comb optical comb signal and the sideband information of the modulated broadband radio frequency signal, transmits the sideband information to the on-chip periodic carrier separation and channel extraction unit, and sets the non-periodic numerical control optical filter to work in a full-pass state in an initial stage.
The on-chip periodic carrier separation and channel extraction unit is a passive integrated optical chip, and the on-chip periodic carrier separation and channel extraction unit comprises a first-order uplink and downlink optical resonance ring, a multi-order cascade resonance ring and a 2 x 1 optical combiner; the first-order uplink download optical resonance ring free spectrum range is consistent with the optical comb frequency interval and is equal to X; the free spectrum range of the multi-order cascade resonance ring is Y, and Y is less than X; the multi-comb optical comb signal enters from a first-order uplink download optical resonant ring input port, all optical carriers are output from a first-order uplink download optical resonant ring drop end by changing the frequency response of the first-order uplink download optical resonant ring through voltage-controlled phase shifting, and the residual modulation sideband is output from a first-order uplink download optical resonant ring through end; output signals of the first-order uplink download optical resonant ring through end are processed by multi-order cascade resonant ring narrow-band filtering, one channel signal is selected to be output from the multi-order cascade resonant ring drop, and the channel signal and output carrier signals of the first-order uplink download optical resonant ring drop end are combined by the 2 x 1 optical combiner to be output to a chip and input to the photoelectric detector.
The on-chip periodic carrier separation and channel extraction unit changes the internal phase relation of the first-order uplink and downlink optical resonance ring and the multi-order resonance ring by utilizing the difference of free spectral ranges of the first-order uplink and downlink optical resonance ring and the multi-order resonance ring to enable the first-order uplink and downlink optical resonance ring and the multi-order resonance ring to achieve a specific matching relation in wavelength response, and realizes one-to-one correspondence of each optical comb tooth and a specific channel through a vernier.
The method for obtaining the required specific channel information from the output end of the photoelectric detector is as follows:
selecting the leftmost optical comb as an initial optical comb, and changing the internal phases of the first-order uplink download optical resonant ring and the multi-order cascade resonant ring so that the passband frequency responses of the first-order uplink download optical resonant ring and the multi-order cascade resonant ring correspond to the position of the initial optical comb;
adjusting the output response of the non-periodic numerical control optical filter to enable the filter passband of the non-periodic numerical control optical filter to be larger than X/2 and smaller than Y, enabling the filter passband of the non-periodic numerical control optical filter to comprise one optical comb tooth and a modulation sideband thereof, and simultaneously filtering out the rest optical comb tooth and sideband information;
and switching the passband position of the non-periodic number control optical filter by a table look-up method to obtain the selective output of a specific channel, and finally obtaining the required specific channel information from the output end of the photoelectric detector.
The reconfigurable optical channel flexible extraction method based on comb switching by using the system comprises the following steps:
the method comprises the following steps that firstly, a local vibration source generates a single-frequency signal with the frequency of X, and respectively drives an electric phase shifter and an electric amplifier, wherein the electric phase shifter outputs a signal to drive a radio frequency port of an intensity modulator, and the electric amplifier outputs a signal to drive a radio frequency port of a phase modulator;
the laser generates a single-frequency optical carrier, the single-frequency optical carrier is sequentially input into the intensity modulator and the phase modulator in a serial connection mode, the flatness of the output optical comb is optimized by changing the parameters of the electric phase shifter and the electric amplifier, and the phase modulator outputs a multi-comb optical comb signal with frequency interval X and flat power;
step two, the multi-comb optical comb signal drive electro-optical modulator with the frequency interval X modulates broadband radio frequency signals in a double-sideband modulation mode and then inputs the signals into a non-periodic numerical control optical filter; in the initial stage, a non-periodic numerical control optical filter is set to work in a full-pass state, so that all comb teeth and modulation sidebands thereof are transmitted to an on-chip periodic carrier separation and channel extraction unit;
selecting the leftmost optical comb teeth as initial optical comb teeth, and changing the internal phases of the first-order uplink download optical resonant ring and the multi-order cascade resonant ring so that the passband frequency responses of the first-order uplink download optical resonant ring and the multi-order cascade resonant ring correspond to the positions of the initial optical comb teeth;
adjusting the output response of the non-periodic numerical control optical filter to enable the filter passband of the non-periodic numerical control optical filter to be larger than X/2 and smaller than Y, enabling the filter passband of the non-periodic numerical control optical filter to comprise one optical comb tooth and a modulation sideband thereof, and simultaneously filtering out the rest optical comb tooth and sideband information;
and step five, switching the passband position of the non-periodic number control optical filter through a table look-up method to obtain the selective output of the specific channel, and finally obtaining the required specific channel information from the output end of the photoelectric detector.
Compared with the prior art, the invention has the following beneficial effects:
(1) compared with the existing optical channelization scheme based on the double optical combs, the single multi-comb optical frequency comb based on the double optical combs performs signal modulation and filtering, so that the coherence is better;
(2) the invention uses the on-chip periodic filtering structure to replace a discrete filtering module, the structure is compact, and the signal coherence is easy to maintain;
(3) compared with the existing scheme in which the channel selection is realized by changing the narrow-band filtering frequency response with complex phase matching relation, the invention supports the numerical control single-pass band filtering screening of fast switching, and can realize the channel selection reconstruction with fast response.
(4) The vernier effect of the invention enables the optical comb teeth to correspond to the channels one by one, the table lookup is obtained, and the use is more intuitive.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a block diagram of a reconfigurable optical channel flexible extraction system based on comb switching according to an embodiment of the present invention;
fig. 2 is a diagram illustrating an example of a relationship between optical combs and channel selection according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a block diagram of a reconfigurable optical channel flexible extraction system based on comb switching according to an embodiment of the present invention; as shown in fig. 1, the reconfigurable optical channel flexible extraction system based on comb switching includes: the device comprises a multi-comb optical frequency comb generating unit, an electro-optical modulator, a non-periodic numerical control optical filter, an on-chip periodic carrier separation and channel extraction unit and a photoelectric detector. All the components are connected in sequence through optical fibers to jointly complete the reconfigurable channelization selection function.
The multi-comb optical frequency comb generating unit is used for generating coherent optical frequency combs with the same frequency interval; the electro-optical modulator realizes the modulation of broadband radio frequency signals on the optical frequency comb; the non-periodic numerical control optical filter realizes the filtering selection of any comb signals; the on-chip periodic carrier separation and channel extraction unit firstly carries out carrier and sideband separation on the signals subjected to the numerical control filtering, then selects and extracts signals of any channel from the sideband signals according to the initial phase and comb teeth of the numerical control filtering and combines the signals with the carrier, and finally completes channel selection and photoelectric conversion through the photoelectric detector and outputs the required channel signals.
The multi-comb optical frequency comb generating unit comprises a laser, an intensity modulator, a phase modulator, an electric phase shifter, an electric amplifier and a local vibration source.
First, the vibration source generates a single-frequency signal of a high power (output 15dBm or more) frequency X (X typical value 25GHz), and drives the electric phase shifter and the electric amplifier, respectively. Then, the output signal of the electric phase shifter drives the radio frequency port of the intensity modulator, and the output signal of the electric amplifier drives the radio frequency port of the phase modulator. The laser generates a single frequency optical carrier (default 1550nm band) that is input in series to the intensity modulator and phase modulator in sequence. By changing the parameters of the electric phase shifter and the electric amplifier, the phase modulator outputs multi-comb (more than 10) optical comb signals with frequency interval X and power flatness less than or equal to 5 dB.
Secondly, the multi-comb optical comb signal driving electro-optical modulator with the frequency interval X is used for modulating broadband radio frequency signals, and the modulation mode is double-sideband modulation. And then inputting the data into a non-periodic numerical control optical filter. In the initial stage, the numerical control filter is set to work in a full-pass state, namely all comb teeth and modulation sidebands thereof can be transmitted to the on-chip periodic carrier separation and channel extraction unit.
The on-chip periodic carrier separation and channel extraction unit is a passive integrated optical chip, and comprises a first-order uplink-download (Add-drop) optical resonant ring, a multi-order cascade resonant ring and a 2 x 1 optical combiner. The free spectrum range of the first-order uplink download (Add-drop) optical resonant ring is consistent with the frequency interval of the optical comb and is equal to X. The free spectrum range of the multi-order cascade resonance loop is Y, and Y is usually less than X. An optical comb signal enters from an input port, the frequency response of the resonant ring is changed through voltage control phase shifting, all optical carriers are output from a first-order upstream downloading optical resonant ring drop end, and the residual modulation sideband is output from a first-order upstream downloading optical resonant ring through end. the output signal of the through end is processed by the multistage cascade resonance ring narrow-band filtering, one channel signal is selected to be output from the drop, and the signal and the output carrier signal of the first-order uplink download optical resonance ring drop end are combined by a 2 x 1 optical combiner and then output to a chip.
The first-order optical resonant ring free spectrum range X, the multi-order resonant ring free spectrum range Y, and Y is usually less than X. The difference of the free spectral ranges of the first-order optical resonance ring and the multi-order resonance ring is utilized to change the internal phase relation of the first-order optical resonance ring and the multi-order resonance ring to enable the first-order optical resonance ring and the multi-order resonance ring to achieve a specific matching relation in wavelength response, and the one-to-one correspondence of each optical comb tooth and a specific channel is realized through a vernier caliper effect. As shown in fig. 2, let X be 25 and Y be 17. Due to the double sideband modulation, the comb tooth interval of the optical frequency comb is divided into two parts, and each part can be divided into 12 sub-channel positions. And selecting the leftmost light comb teeth as an initial, and changing the internal phases of the first-order light resonant ring and the multi-order resonant ring so that the frequency responses of the two pass bands correspond to the positions of the comb teeth.
At the moment, the output response of the non-periodic numerical control optical filter is adjusted to enable the passband of the non-periodic numerical control optical filter to be slightly larger than X/2 and smaller than Y, so that the filtering passband of the non-periodic numerical control optical filter comprises one optical comb tooth and the modulation sideband thereof, and the rest comb teeth and the sideband information are filtered. The numerical control filtering frequency response is adjustable, and the filtering pass band is switched in different comb teeth through each numerical control adjustment. By a table look-up method, the selective output of a specific channel can be obtained by rapidly switching the passband position of the non-periodic numerical control optical filter, and finally the required specific channel information is obtained from the output end of the photoelectric detector.
Fig. 2 is an example of a corresponding relationship between optical comb teeth and channel selection provided by the embodiment of the present invention, where the optical comb tooth on the leftmost side is selected as an initial, and internal phases of the first-order optical resonant ring and the multi-order resonant ring are changed, so that both passband frequency responses correspond to the positions of the comb teeth. According to the vernier effect, the second pass band of the multi-step resonant ring corresponds to the 8 th channel of the next optical comb. By analogy, the third passband corresponds to the 10 th channel, the fourth passband corresponds to the 2 nd channel, the fifth passband corresponds to the 6 th channel, and the seventh passband corresponds to the 4 th channel.
Compared with the prior optical channelization or optical multiplexer technology, the system of the invention has the following advantages:
signal modulation and filtering are carried out based on a single multi-comb optical frequency comb, so that the coherence is better;
the on-chip periodic filtering structure replaces a discrete filtering module, so that the structure is compact, and the signal coherence is easy to maintain;
the vernier effect enables channels and optical comb teeth to be in one-to-one correspondence, corresponding output channel selection can be achieved through comb tooth selection, and reconfigurable optical channel selectivity is achieved.
The reconstruction method comprises the following steps: numerical control single-passband filtering supporting rapid switching is used for replacing periodic filtering with complex phase matching relation, and channel selection reconfiguration with rapid response can be achieved.
The reconfigurable optical channel flexible extraction method based on comb switching by using the system comprises the following steps:
the method comprises the following steps that firstly, a local vibration source generates a single-frequency signal with the frequency of X, and respectively drives an electric phase shifter and an electric amplifier, wherein the electric phase shifter outputs a signal to drive a radio frequency port of an intensity modulator, and the electric amplifier outputs a signal to drive a radio frequency port of a phase modulator;
the laser generates a single-frequency optical carrier, the single-frequency optical carrier is sequentially input into the intensity modulator and the phase modulator in a serial connection mode, the flatness of the output optical comb is optimized by changing the parameters of the electric phase shifter and the electric amplifier, and the phase modulator outputs a multi-comb optical comb signal with frequency interval X and flat power;
step two, the multi-comb optical comb signal drive electro-optical modulator with the frequency interval X modulates broadband radio frequency signals in a double-sideband modulation mode and then inputs the signals into a non-periodic numerical control optical filter; in the initial stage, a non-periodic numerical control optical filter is set to work in a full-pass state, so that all comb teeth and modulation sidebands thereof are transmitted to an on-chip periodic carrier separation and channel extraction unit;
selecting the leftmost optical comb teeth as initial optical comb teeth, and changing the internal phases of the first-order uplink download optical resonant ring and the multi-order cascade resonant ring so that the passband frequency responses of the first-order uplink download optical resonant ring and the multi-order cascade resonant ring correspond to the positions of the initial optical comb teeth;
adjusting the output response of the non-periodic numerical control optical filter to enable the filter passband of the non-periodic numerical control optical filter to be larger than X/2 and smaller than Y, enabling the filter passband of the non-periodic numerical control optical filter to comprise one optical comb tooth and a modulation sideband thereof, and simultaneously filtering out the rest optical comb tooth and sideband information;
and step five, switching the passband position of the non-periodic number control optical filter through a table look-up method to obtain the selective output of the specific channel, and finally obtaining the required specific channel information from the output end of the photoelectric detector.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (8)
1. A reconfigurable optical channel flexible extraction system based on comb switching is characterized by comprising: the system comprises a multi-comb optical frequency comb generating unit, an electro-optical modulator, a non-periodic numerical control optical filter, an on-chip periodic carrier separation and channel extraction unit and a photoelectric detector which are sequentially connected through optical fibers;
the multi-comb optical frequency comb generating unit generates coherent optical frequency combs with the same frequency interval, the electro-optical modulator receives broadband radio-frequency signals and completes modulation of the broadband radio-frequency signals on the optical frequency combs, and the non-periodic numerical control optical filter performs filtering selection on any comb-tooth signals; after the on-chip periodic carrier separation and channel extraction unit carries out carrier and sideband separation on the signals subjected to the numerical control filtering, the frequency response characteristic of the on-chip periodic carrier separation and channel extraction unit is modulated, the signals of any channel are extracted from the sideband signals by controlling comb teeth of the numerical control filtering to be combined with the carrier, finally, channel selection and photoelectric conversion are completed through a photoelectric detector, and the required channel signals are output.
2. The reconfigurable optical channel flexible extraction system based on comb switching as claimed in claim 1, wherein the multi-comb optical frequency comb generation unit comprises a laser, an intensity modulator, a phase modulator, an electric phase shifter, an electric amplifier and a local oscillator;
the vibration source generates a single-frequency signal with power output of more than 15dBm and frequency of X, and the single-frequency signal drives the electric phase shifter and the electric amplifier respectively; the output signal of the electric phase shifter drives the radio frequency port of the intensity modulator, and the output signal of the electric amplifier drives the radio frequency port of the phase modulator; the laser generates a single-frequency optical carrier, and the single-frequency optical carrier is sequentially input into the intensity modulator and the phase modulator in a serial connection mode; by changing the parameters of the electric phase shifter and the electric amplifier, the phase modulator outputs a multi-comb optical comb signal with the frequency interval of X and the power flatness of less than or equal to 5 dB.
3. The comb-switching-based reconfigurable optical channel flexible extraction system according to claim 2, wherein the electro-optical modulator receives a broadband radio frequency signal, the multi-comb optical comb signal with the frequency interval of X drives the electro-optical modulator to modulate the broadband radio frequency signal, and the modulation mode is double-sideband modulation.
4. The system as claimed in claim 3, wherein the aperiodic NC optical filter receives the multi-comb optical comb signal and the sideband information of the modulated broadband RF signal, and transmits the signal to the on-chip periodic carrier separation and channel extraction unit, and the aperiodic NC optical filter is set to operate in an all-pass state during an initial stage.
5. The system of claim 4, wherein the on-chip periodic carrier separation and channel extraction unit is a passive integrated optical chip, and the on-chip periodic carrier separation and channel extraction unit comprises a first-order uplink-downlink optical resonant ring, a multi-order cascade resonant ring and a 2 x 1 optical combiner; the first-order uplink download optical resonance ring free spectrum range is consistent with the optical comb frequency interval and is equal to X; the free spectrum range of the multi-order cascade resonance ring is Y, and Y is less than X; the multi-comb optical comb signal enters from a first-order uplink download optical resonant ring input port, all optical carriers are output from a first-order uplink download optical resonant ring drop end by changing the frequency response of the first-order uplink download optical resonant ring through voltage-controlled phase shifting, and the residual modulation sideband is output from a first-order uplink download optical resonant ring through end; output signals of the first-order uplink download optical resonant ring through end are processed by multi-order cascade resonant ring narrow-band filtering, one channel signal is selected to be output from the multi-order cascade resonant ring drop, and the channel signal and output carrier signals of the first-order uplink download optical resonant ring drop end are combined by the 2 x 1 optical combiner to be output to a chip and input to the photoelectric detector.
6. The system according to claim 5, wherein the on-chip periodic carrier separation and channel extraction unit changes respective internal phase relationships thereof by using the difference in free spectral ranges between the first-order uplink and downlink optical resonance rings and the multiple-order resonance rings to achieve a specific matching relationship in wavelength response, and realizes one-to-one correspondence between each optical comb and a specific channel by a vernier caliper effect.
7. The comb-switching-based reconfigurable optical channel flexible extraction system according to claim 6, wherein the method for obtaining the required specific channel information from the output end of the photodetector is as follows:
selecting the leftmost optical comb as an initial optical comb, and changing the internal phases of the first-order uplink download optical resonant ring and the multi-order cascade resonant ring so that the passband frequency responses of the first-order uplink download optical resonant ring and the multi-order cascade resonant ring correspond to the position of the initial optical comb;
adjusting the output response of the non-periodic numerical control optical filter to enable the filter passband of the non-periodic numerical control optical filter to be larger than X/2 and smaller than Y, enabling the filter passband of the non-periodic numerical control optical filter to comprise one optical comb tooth and a modulation sideband thereof, and simultaneously filtering out the rest optical comb tooth and sideband information;
and switching the passband position of the non-periodic number control optical filter by a table look-up method to obtain the selective output of a specific channel, and finally obtaining the required specific channel information from the output end of the photoelectric detector.
8. The reconfigurable optical channel flexible extraction method based on comb switching by using the system as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
the method comprises the following steps that firstly, a local vibration source generates a single-frequency signal with the frequency of X, and respectively drives an electric phase shifter and an electric amplifier, wherein the electric phase shifter outputs a signal to drive a radio frequency port of an intensity modulator, and the electric amplifier outputs a signal to drive a radio frequency port of a phase modulator;
the laser generates a single-frequency optical carrier, the single-frequency optical carrier is sequentially input into the intensity modulator and the phase modulator in a serial connection mode, the flatness of the output optical comb is optimized by changing the parameters of the electric phase shifter and the electric amplifier, and the phase modulator outputs a multi-comb optical comb signal with frequency interval X and flat power;
step two, the multi-comb optical comb signal drive electro-optical modulator with the frequency interval X modulates broadband radio frequency signals in a double-sideband modulation mode and then inputs the signals into a non-periodic numerical control optical filter; in the initial stage, a non-periodic numerical control optical filter is set to work in a full-pass state, so that all comb teeth and modulation sidebands thereof are transmitted to an on-chip periodic carrier separation and channel extraction unit;
selecting the leftmost optical comb teeth as initial optical comb teeth, and changing the internal phases of the first-order uplink download optical resonant ring and the multi-order cascade resonant ring so that the passband frequency responses of the first-order uplink download optical resonant ring and the multi-order cascade resonant ring correspond to the positions of the initial optical comb teeth;
adjusting the output response of the non-periodic numerical control optical filter to enable the filter passband of the non-periodic numerical control optical filter to be larger than X/2 and smaller than Y, enabling the filter passband of the non-periodic numerical control optical filter to comprise one optical comb tooth and a modulation sideband thereof, and simultaneously filtering out the rest optical comb tooth and sideband information;
and step five, switching the passband position of the non-periodic number control optical filter through a table look-up method to obtain the selective output of the specific channel, and finally obtaining the required specific channel information from the output end of the photoelectric detector.
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