Research On The Deterministic Dissipative Kerr Soliton Generation In The Optical Microresonator

With the development of micro-nano technology,high-quality factor micro-ring resonator can effectively promote the development of integrated turn-key dissipative Kerr soliton optical comb source due to its strong field enhancement factor,high optical field density and CMOS process compatibility,etc.In recent years,dissipative Kerr soliton optical frequency comb based on the microcavity have shown unprecedented advantages in high-speed ranging,high-capacity optical communication,parallel optical computing,quantum key distribution,microwave signal generation and synthesis,etc.In this dissertation,based on the high-index doped silica glass microresonator,we investigate the deterministic generation of dissipative Kerr soliton.Based on the mode frequency shift induced by the different modes coupling effect,we demonstrate the microcomb evolution dynamics.Based on the pump mode frequency induced by the mode coupling effect,we demonstrate the physical mechanism of single soliton microcomb formation.Based on the non-pump mode frequency induced by the mode coupling effect,we demonstrate the physical mechanism of soliton crystals and dispersive radiation.Via the nonlinear coupling mode theory,we theoretical investigate the mechanism of dark pulse generation.Based on the mode splitting effect induced by the backscatter wave,we theoretically demonstrate the optical field stability in the micro-cavity.Theory proves that the symmetry breaking,self-oscillation and self-thermal balance could exist in the mode-splitting micro-cavity.In experiment,we demonstrate the generation of self-oscillation microcomb and breather soliton.Based on the self-thermal balance,we demonstrate the multi-soliton generation.Via introducing the auxiliary laser pumping technique to maintain the thermal balance at the soliton region,the soliton step is extended at the order of millisecond,via optimizing the frequency spacing of pump laser and auxiliary laser,we achieve the“one-button-start”single soliton microcomb source.Based on the single soliton microcomb source and Mach-Zehnder interferometer（MZI）network,the principle of parallel optoelectronic hybrid neural network is verified.The main research results and contents are demonstrated as follows:1.In the near-zero dispersion microresonator,based on 160MHz frequency shift of pump mode induced by the avoided mode-crossing effect,the condition of local phase matching is changed,the native mode spaced microcomb is generated when the pump laser locates at this mode.Due to the single background optical field in the cavity,via increasing the wavelength of pump laser,single soliton could been directly generated without experiencing interactions with solitons and the modulation instability state.The local dispersion could been changed via the mode-crossing effect and the local power of microcomb could been enhanced,thus the periodic modulated background optical field is created.In the high pump power,the modulation background and high-noise modulation instability have random interference,various kinds of soliton crystals are generated.At the specific pump power range,the perfect soliton crystal（PSC）is deterministically generated and the optical field couldn’t experience the high-noise modulation instability microcomb.Based on the mode-crossing effect,we demonstrate the basic physical principle of dispersive wave radiation.Based on the mode-coupling effect,the evolution dynamics of dark pulse is theoretically investigated in the normal dispersion region.Via changing the mode coupling position,arbitrary equidistant dark pulse sequences are achieved.2.Based on the mode splitting effect induced by the Rayleigh backscatter,the theory of linear stability analysis could prove that the phenomena of spontaneous symmetry breaking,self-thermal balance and self-oscillation could exist in the mode splitting microcavity.Via pumping at the mode-splitting mode,the self-oscillation primary comb,self-oscillation low noise microcomb and breather microcomb are generated.The optical field of clockwise（CW）and counterclockwise（CCW）presents the approximate inverse oscillation property.Based on the principle of self-thermal balance via mode splitting,assisted by the exchange power of CW optical field and CCW optical field,we achieve the transformation between 9-soliton and 3-soliton without undergoing the high-noise modulation instability state.3.Via introducing the time-lens and dual-comb asynchronous sampling system,we investigate the soliton sequences in the microresonator.Via introducing the modulator,fiber ring and Er³⁺dopped fiber amplifier,the wide spectrum of electro-optic comb is achieved.Benefitted from the field enhancement of fiber ring and optical amplification of Er³⁺dopped fiber amplifier,in the power range of-80 d Bm～0d Bm,the spectral width reaches about 14 nm and demonstrates the triangular shape.Via introducing the power criterion of single soliton and optimizing the frequency spacing of pump laser and auxiliary laser,the program-controlled single soliton generation prototype system is demonstrated and the single soliton could been generated within 120 s.Through the active feedback of power and frequency spacing of pump laser and auxiliary,the spectrum single soliton could been shifted about one free spectral range via thermal tuning method.Based on MZI network and lithium niobate modulator,the double layer photoelectric hybrid neural network system is realized,and the digit recognition accuracy of each frequency comb is about 80%.