Approximation-free and iteration-free method for spectral analysis of intracavity electro-optic modulation type optical frequency comb, device and medium

1 . A method comprising:

step 1: calculating a residual phase delay of a single propagation of laser in a resonant cavity according to an incident laser frequency of a light source of an intracavity electro-optic modulation type optical frequency comb, a resonant frequency of the resonant cavity, an intracavity electro-optic modulation frequency, and intracavity material dispersion;

step 2: performing an analysis of outgoing transmission characteristics of the light source, and obtaining corresponding outgoing laser electric field intensities E n according to cyclic propagation times n in the resonant cavity;

step 3: accumulating the outgoing laser electric field intensities E n corresponding to all the cyclic propagation times n to obtain a complete outgoing laser electric field intensity E;

step 4: using a Jacobi-Anger expansion on the complete outgoing laser electric field intensity E to obtain a cumulative sum of infinite harmonic terms based on a Bessel function in an approximate-free manner;

step 5: extracting an outgoing laser electric field intensity E k ′ of k th -order comb teeth from the cumulative sum;

step 6: obtaining an outgoing laser light intensity I k of the k th -order comb teeth, and performing a spectral analysis of the intracavity electro-optic modulation type optical frequency comb in accordance with the outgoing laser light intensity I k ;

step 7: determining a current working state of the light source by comparing a measured spectrum of the intracavity electro-optic modulation type optical frequency comb based on the spectral analysis and simulation results of a spectral envelope curve; and

step 8: adjusting a physical parameter of the intracavity electro-optic modulation type optical frequency comb based on the current working state, wherein the physical parameter is selected from a group consisting of:

(1) the incident laser frequency;

(2) the intracavity electro-optic modulation frequency;

(3) the intracavity material dispersion; and

(4) a geometric length of the resonant cavity.

2 . The method according to claim 1 , wherein the resonant cavity is a linear cavity, a ring cavity, a folded cavity or a composite cavity.

3 . The method according to claim 1 , wherein the light source comprises a discrete spatial optical device, an integrated optical fiber ring cavity, or an on-chip micro-resonant cavity.

4 . The method according to claim 1 , wherein the residual phase delay is selected from the group consisting of: a residual phase delay due to a mismatch between the incident laser frequency and the resonant frequency; a residual phase delay due to a mismatch between the resonant frequency and the intracavity electro-optic modulation frequency; a residual phase delay due to the intracavity material dispersion; and any combination thereof.

5 . The method according to claim 1 , wherein the analysis of the outgoing transmission characteristics selected from the group consisting of: an analysis of an outgoing transmission model based on a spatial double-mirror linear cavity; an analysis of an outgoing transmission model based on a multi-mirror ring cavity; an analysis of an outgoing transmission model based on an optical fiber ring cavity; an analysis of an outgoing transmission model based on an on-chip micro-resonant cavity; and any combination thereof.

6 . The method according to claim 1 , wherein the outgoing laser electric field intensities E n are selected from the group consisting of: a transmitted laser electric field intensity E tn and a reflected laser electric field intensity E rn .

7 . The method according to claim 1 , wherein in each of the cyclic propagation times n, the outgoing laser light intensity I n is greater than 0 in presence of a floating-point truncation error.

8 . An electronic device, comprising a memory and a processor, wherein computer programs are stored in the memory, and the processor implements the steps of the method of claim 1 when executing the computer programs.

9 . A non-transitory computer-readable storage medium for storing computer instructions, wherein the steps of the method of claim 1 are implemented when the computer instructions are executed by a processor.