CN112882310B - Kerr optical comb-based arbitrary high-order modulation format signal phase regeneration method - Google Patents
Kerr optical comb-based arbitrary high-order modulation format signal phase regeneration method Download PDFInfo
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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Abstract
The invention discloses a Kerr optical comb-based method for regenerating any high-order modulation format signal phase, which generates a large number of equally-spaced coherent optical fields through a Kerr optical comb, extracts corresponding frequency components in the coherent optical fields to be used as carrier waves and pumping light, can ensure that the carrier waves and pumping have better coherence, simplifies the generation process of the coherent pumping optical field, meets the requirement of all-optical phase regeneration of any high-order modulation signal on the pumping optical field, realizes the precise regulation and control of a phase transfer function in the phase-sensitive parameter process, can solve the complexity bottleneck problem of all-optical phase regeneration, and pushes the all-optical regeneration technology to be practical.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a method for regenerating any high-order modulation format signal phase based on a Kerr optical comb.
Background
The multi-stage phase modulation format can obtain higher bit rate under the condition of unchanged baud rate, and the spectral width can not be increased while the single-channel transmission rate is improved. The all-optical phase regeneration of any advanced modulation format signal at the optical network node can reduce the working rate limitation and system power consumption brought by the photoelectric and electro-optical conversion process on the optical network node, and greatly improve the transmission capacity of the all-optical communication network.
At present, the all-optical phase regeneration of a high-order modulation signal is mainly realized by utilizing the phase compression capability of phase-sensitive amplification (PSA). In order to achieve effective phase regeneration based on PSA, it is necessary to accurately extract the carrier phase information from the data signal and generate multiple pump optical fields that are coherent with the signal carrier phase.
There are two main approaches to achieve carrier extraction and phase locking. The first method is to combine the preceding stage fiber four-wave mixing (FWM) and injection locking process, and the carrier extraction usually adopts a laser injection locking scheme to obtain a phase-locked carrier, so as to separate the phase information of the carrier from the phase information of the data; the auxiliary coherent optical field is generated by a carrier replica (carrier coupler) scheme based on optical fiber four-wave mixing, but the pump coherent optical field generated by the carrier replica (carrier coupler) has poor coherence, so that the efficiency of high-order modulation format signal phase regeneration is low, the structure is complex, and the auxiliary coherent optical field is the biggest obstacle for limiting the practicality of all-optical regeneration at present.
The second is a frequency comb scheme, which divides the carrier into two paths, one path is used as a signal carrier, and the other path generates an equally spaced frequency comb after loading a sinusoidal radio frequency signal, so as to obtain a pumping optical field coherent with the phase of the signal carrier. Because the pumping optical field is generated in a carrier, the influence of carrier phase information and pumping phase information on a data signal can be mutually counteracted in the subsequent phase regeneration process, the scheme has a simple structure, the generated pumping coherent optical field has better coherence and can be used for high-order modulation format signal phase regeneration, but the bandwidth of a regeneration signal is limited to dozens of GHz due to the fact that the frequency comb is generated through electro-optical modulation, and the regeneration signal is difficult to apply.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a Kerr optical comb-based method for regenerating the phase of any high-order modulation format signal, which utilizes the Kerr parametric oscillation effect in an optical microcavity to simultaneously generate a large number of equally-spaced coherent optical fields (namely, the microcavity Kerr optical comb), can obtain coherent signals and pumping optical fields with definite phase relation and controllable frequency interval, and avoids the problems of complex structure, low efficiency, bandwidth limitation and the like of the conventional coherent pumping optical field extraction scheme, thereby efficiently and precisely realizing the all-optical phase regeneration of any high-order modulation signal.
In order to achieve the above object, the present invention provides a method for regenerating a phase of an arbitrary high-order modulation format signal based on a kerr optical comb, comprising:
(1) firstly generating a Kerr optical comb for obtaining an equidistant coherent light field in an optical microcavity by using pump laser and auxiliary laser, continuously adjusting the wavelength and power of the pump laser and the auxiliary laser to enable the optical comb to be stabilized in a soliton mode locking state, and recording the free spectral range f of each comb tooth of the Kerr optical comb0；
(2) Filtering out the frequency on a Kerr comb according to the required regenerated M-order modulation signalRate interval Mf0Or (M-2) f0Two comb teeth, respectively denoted as P as pump light1、P2And measuring the pump light P1、P2Is noted as fp1、fp2(ii) a Then, the Kerr comb is used to filter out the pumping light P between the two beams1Distance f0The comb teeth of the comb are used as carrier waves;
(3) modulating an M-order modulation signal containing noise on a carrier wave to obtain a signal light s, and measuring the center frequency of the signal light s to obtain a signal light fs；
(4) Adjusting the signal light s and the pump light P1And the signal light and the pump light P after polarization control1High-order four-wave mixing is carried out through a high nonlinear material, then M-1 subharmonic of signal light is filtered out to be used as idler frequency light to be recorded as i, and the central frequency of the idler frequency light i is measured to be recorded as fi；
(5) An idler frequency light i, a signal light s and a pump light P1And P2The four beams of light are coupled into a high nonlinear material together, the four beams of coupled light are subjected to phase-sensitive amplification in the high nonlinear material, an idler frequency light and a pump light can generate a beam of new light at a signal light during the phase-sensitive amplification, and the new light is interfered with the signal light to realize the phase regeneration of an M-order modulation signal;
(6) adjusting idler frequency light i, signal light s and pump light P1And P2By monitoring the spectrum of the regenerated signal light, the optimal phase regeneration is achieved;
(7) and when the phase regeneration reaches the optimum, filtering out the regenerated signal light, and extracting the phase transfer function of the regenerated signal light, thereby obtaining a regenerated M-order modulation signal and realizing the phase regeneration of the M-order signal.
The invention aims to realize the following steps:
the invention relates to a Kerr optical comb-based method for regenerating any high-order modulation format signal phase, which generates a large amount of equally-spaced coherent optical fields through the Kerr optical comb, extracts corresponding frequency components in the coherent optical fields to be used as carrier waves and pumping light, can ensure that the carrier waves and pumping have better coherence, simplifies the generation process of a coherent pumping optical field, meets the requirement of all-optical phase regeneration of any high-order modulation signal on the pumping optical field, realizes the precise regulation and control of a phase transfer function in the phase-sensitive parameter process, can solve the problem of complexity bottleneck of all-optical phase regeneration, and pushes the all-optical regeneration technology to be practical.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a QPSK signal phase regeneration apparatus;
fig. 2 is a flow chart of a method for regenerating the phase of an arbitrary high-order modulation format signal based on a kerr optical comb.
Detailed Description
The following description of the embodiments of the present invention is provided in order to better understand the present invention for those skilled in the art with reference to the accompanying drawings. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the subject matter of the present invention.
Examples
Fig. 1 is a schematic structural diagram of an embodiment of a QPSK signal phase regeneration apparatus.
In this example, as shown in fig. 1, the arbitrary high-order modulation format signal phase regeneration apparatus includes a signal optical module 1, a pump laser module 2, an idler frequency optical module 3, and a phase regeneration module 4. In the present embodiment, the signal optical module 1 includes an Optical Band Pass Filter (OBPF)101, a Phase Modulator (PM)102, and a power amplifier (EDFA) 103. The input kerr optical comb selects a suitable carrier through an Optical Band Pass Filter (OBPF)101, modulates the damaged QPSK signal onto the carrier through a Phase Modulator (PM)102, and then inputs the signal light S into an idler optical module 3 through a power amplifier (EDFA) 103.
The pump laser module 2 contains Optical Band Pass Filters (OBPFs) 201, 202 and a power amplifier (EDFA) 203. The input Kerr comb passes through Optical Band Pass Filters (OBPF)201 and 202 to select two frequency components as pump light P1、P2In which P is1Is input into an idler module 3 through a power amplifier (EDFA)203, P2Input to a phase regeneration module4, the process is repeated. In the present embodiment, the center frequency f of the signal light issPump light P1、P2Frequency f ofp1、fp2Satisfies the following conditions: f. ofp1+fp2＝2fs；
The idler module 3 comprises Polarization Controllers (PC)301, 302, an optical coupler 303, a silicon-based waveguide 304, an optical band-pass filter (OBPF) 305. The signal light S output by the signal light module 1 and the pump light P output by the pump laser module 21After the polarization state is adjusted by the Polarization Controllers (PC)301 and 302, respectively, the signals are input into the silicon-based waveguide 304 through the optical coupler 303 to generate an optical four-wave mixing process, so as to obtain the second harmonic and the third harmonic of the signal light, and the signal light third harmonic is filtered out through the optical bandpass filter (OBPF)305 to be input into the phase regeneration module 4 as the idler frequency light i according to the fact that the QPSK signal to be regenerated is a fourth-order step signal.
The phase regeneration module 4 comprises power amplifiers (EDFAs) 401, 402, 403, 404, Polarization Controllers (PCs) 405, 406, 407, 408, an optical coupler 409, a silicon based waveguide 410, an Optical Band Pass Filter (OBPF) 411. Signal light S, idler frequency light i and pump light P1、P2The power is adjusted by power amplifiers (EDFAs) 401, 402, 403 and 404, after the polarization state is adjusted by Polarization Controllers (PCs) 405, 406, 407 and 408, the signals are combined by an optical coupler 409 and input into a silicon-based waveguide 410 to generate a phase-sensitive amplification (PSA) process, new light generated by idler frequency light i and pump phase-sensitive amplification (PSA) interferes with the signals at the signal light position to achieve the effect of phase regeneration, and regenerated signals are filtered out by an optical band-pass filter (OBPF) 411.
The invention improves the extraction mode of the pumping light field coherent with the signal carrier phase in the phase regeneration of any high-order modulation format signal, and is easier to obtain the pumping light field with high coherence.
Fig. 2 is a flow chart of the method for regenerating the phase of any high-order modulation format signal based on the kerr optical comb.
In this embodiment, as shown in fig. 2, a method for regenerating a phase of an arbitrary high-order modulation format signal based on a kerr optical comb according to the present invention includes:
S1firstly generating a Kerr optical comb for obtaining an equidistant coherent light field in an optical microcavity by using pump laser and auxiliary laser, continuously adjusting the wavelength and power of the pump laser and the auxiliary laser to enable the optical comb to be stabilized in a soliton mode locking state, and recording the free spectral range f of each comb tooth of the Kerr optical comb0And f is0More than twice the bandwidth of the regenerated M-order modulated signal, so that adjacent fingers can be used as pump light and carrier.
S2, according to the needed regenerated M-order modulation signal, filtering out the frequency interval Mf on the Kerr optical comb0Or (M-2) f0Two comb teeth, respectively denoted as P as pump light1、P2And measuring the pump light P1、P2Is noted as fp1、fp2(ii) a Then, the Kerr comb is used to filter out the pumping light P between the two beams1Distance f0The comb teeth of the comb are used as carrier waves; wherein, the carrier wave and the pump are both from the same optical comb light source, and the carrier wave and the pump light P are required1The frequency difference is equal to the idler frequency and the pump light P2Frequency difference of (d) is equal to f0。
S3, modulating M-order modulation signal containing noise on carrier wave, amplifying by erbium-doped fiber amplifier EDFA to obtain signal light S, and measuring the central frequency of signal light S to obtain signal light fs。
S4, because the signals are separated from the pump light in the same Kerr comb, the signals and the pump light have better coherence, and the signals and the pump light P are adjusted1And the signal light and the pump light P after polarization control1Performing high-order four-wave mixing through a high-nonlinearity material to generate multiple harmonics of the signal light, extracting M-1 harmonics of the signal light through an Optical Band Pass Filter (OBPF) to serve as idler light to be recorded as i, and measuring the center frequency of the idler light i to be recorded as fiThe generated idler light is conjugated with the phase of the signal light, and the phase of the idler light is M-1 times of the phase of the signal light.
S5, mixing the idler light i, the signal light S and the pump light P1And P2Coupled into the high nonlinear material together by an optical coupler, wherein the idler light i, the signal light s and the pump lightP1And P2Should satisfy: f. ofs+fi＝fp1+fp2Or fs-fi＝fp1-fp2。
The coupled four beams of light are subjected to phase-sensitive amplification in a high-nonlinearity material, an idler frequency light and a pumping light can generate a beam of new light at a signal light during the phase-sensitive amplification, and the new light is interfered with the signal light to realize the phase regeneration of the M-order modulation signal.
S6, adjusting idler frequency light i, signal light S and pump light P1And P2The power and polarization state of (a), wherein the power of the idler light i and the signal light s needs to be adjusted:
Pi＝Ps/(M-1)
where M represents the order of any high order modulation format signal that needs to be reproduced, PiFor idle optical power, PPsIs the signal light power;
finally, the spectrum of the regenerated signal light is monitored to achieve optimal phase regeneration.
And S7, when the phase regeneration reaches the best, filtering out the regeneration signal light, and extracting the phase transfer function of the regeneration signal light, thereby obtaining a regeneration M-order modulation signal and realizing the phase regeneration of the M-order signal.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (6)
1. A method for regenerating any high-order modulation format signal phase based on Kerr optical comb is characterized by comprising the following steps:
(1) firstly generating a Kerr optical comb for obtaining an equally-spaced coherent optical field in an optical microcavity by using pump laser and auxiliary laser, and continuously adjustingThe wavelength and power of the pump laser and the auxiliary laser enable the optical comb to be stabilized in a soliton mode locking state, and the free spectral range f of each comb tooth of the Kerr optical comb is recorded0；
(2) Filtering out a frequency interval Mf on a Kerr optical comb according to the required regenerated M-order modulation signal0Or (M-2) f0Two teeth, respectively denoted as P as pump light1、P2And measuring the pump light P1、P2Is noted as fp1、fp2(ii) a Then, the Kerr comb is used to filter out the pumping light P between the two beams1Distance f0The comb teeth of the comb are used as carrier waves;
(3) modulating an M-order modulation signal containing noise on a carrier wave to obtain a signal light s, and measuring the center frequency of the signal light s to obtain a signal light fs；
(4) Adjusting the signal light s and the pump light P1And the signal light and the pump light P after polarization control1High-order four-wave mixing is carried out through a high nonlinear material, then M-1 subharmonic of signal light is filtered out to be used as idler frequency light to be recorded as i, and the central frequency of the idler frequency light i is measured to be recorded as fi；
(5) An idler frequency light i, a signal light s and a pump light P1And P2The four beams of light are coupled into a high nonlinear material together, the four beams of coupled light are subjected to phase-sensitive amplification in the high nonlinear material, an idler frequency light and a pump light can generate a beam of new light at a signal light during the phase-sensitive amplification, and the new light is interfered with the signal light to realize the phase regeneration of an M-order modulation signal;
(6) adjusting idler frequency light i, signal light s and pump light P1And P2By monitoring the spectrum of the regenerated signal light, the optimal phase regeneration is achieved;
(7) and when the phase regeneration reaches the optimum, filtering out the regenerated signal light, and extracting the phase transfer function of the regenerated signal light, thereby obtaining a regenerated M-order modulation signal and realizing the phase regeneration of the M-order signal.
2. Kerr optical comb based comb as claimed in claim 1The method for regenerating the phase of the signal in the Ith-order modulation format is characterized in that the free spectral range f of each comb tooth of the Kerr optical comb0Satisfies the following conditions: f. of0Greater than twice the bandwidth of the regenerated order-M modulated signal.
3. The method according to claim 1, wherein the idler light i, the signal light s and the pump light P are selected from a group consisting of a pump light P, a pump light S, and a Kerr comb1And P2Should satisfy: f. ofs+fi＝fp1+fp2Or fs-fi＝fp1-fp2。
4. The method for regenerating any high-order modulation format signal phase based on the kerr optical comb according to claim 1, wherein the powers of the idler i and the signal s satisfy the following conditions when the powers and the polarization states are adjusted in the step (6):
Pi＝Ps/(M-1)
where M represents the order of any high order modulation format signal that needs to be reproduced, PiIs idle optical power, PsIs the signal light power.
5. The method as claimed in claim 1, wherein the carrier and the pump light P are selected from a group consisting of1The frequency difference is equal to the idler frequency and the pump light P2Frequency difference of (d) is equal to f0。
6. The method as claimed in claim 1, wherein the idler is conjugate to the phase of the signal light, and the phase of the idler is M-1 times that of the signal light.
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