High-stability high-power multi-wavelength optical pulse generation system

Abstract

The invention relates to a high-stability high-power multi-wavelength optical pulse generation system, which belongs to the technical field of optoelectronic equipment, and is structurally characterized in that the output end of a seed pulse source (1) is connected with the input end of a pulse width expansion module (2), and the output end of the pulse width expansion module (2) is connected with the input end of a power amplification module (3); the output end of the power amplification module (3) is connected with the input end of the shaping light path module (4), and the output end of the shaping light path module (4) is connected with the input end of the pulse width compression stable output module (5). The device can output multi-wavelength ultrashort optical pulses, and has the advantages of high output power, multiple wavelengths and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of optoelectronic equipment, and in particular relates to a high-stability, high-power multi-wavelength optical pulse generating system. Background Art

[0002] With the rapid development of modern communication technology, people's demand for communication capacity is increasing, and traditional single-wavelength optical fiber communication systems can no longer meet the growing demand for information transmission. In order to further increase communication capacity, modern optical fiber wavelength division multiplexing (WDM) communication systems are developing in the direction of increasing the number of channels, which requires a light source that can provide multiple wavelengths of optical signals at the same time, and the research on multi-wavelength fiber lasers is becoming more and more in-depth. In addition to the communication field, in many fields such as laser ranging, spectral analysis, and distributed optical fiber sensing, high-performance multi-wavelength light sources are also needed to meet different application requirements. For example, in spectral analysis, different wavelengths of light are needed to excite and detect the spectral characteristics of matter, which further promotes the research and development of multi-wavelength fiber lasers.

[0003] The working principle of multi-wavelength fiber laser is similar to that of ordinary lasers, both of which generate light based on the principle of stimulated emission. The main way to achieve this is to introduce special optical elements into the resonant cavity or utilize the nonlinear effect of optical fiber to achieve laser output of multiple wavelengths. For example, the gain characteristics of erbium-doped fiber can be directly utilized to insert a comb filter into the resonant cavity, such as Sagnac interferometer based on fiber grating, sampled fiber Bragg grating and Fabry-Perot (FP) resonant cavity, and fiber Mach-Zehnder (MZ) interferometer, etc., and multi-wavelength laser output can be obtained by cooling the erbium-doped fiber with liquid nitrogen.

[0004] Multi-wavelength fiber lasers based on erbium-doped fiber (EDF) have been widely studied and developed for their advantages such as low cost, high saturation power, low polarization-dependent gain, low laser threshold, wide gain bandwidth and high conversion efficiency. Multi-wavelength pulsed fiber lasers have received widespread attention due to their wide range of applications, including wavelength division multiplexer (WDM) fiber communication systems, photon component characterization and optical signal processing. In the future, the development direction and application prospects of multi-wavelength fiber lasers are broad, such as more wavelengths, high power, high efficiency, compactness, flexible adjustment and adjustment of output wavelengths, simple switching, good power balance when switching between wavelengths, and stable operation, so that they can be widely used in communication, measurement, medical and other fields, which will bring more convenience and innovation to people's production and life. Although the performance of multi-wavelength fiber lasers has been greatly improved, in some high-demand application scenarios, it is still necessary to further improve the number of output wavelengths, output power and stability to meet actual needs.

[0005] In summary, the current fiber laser system for obtaining multi-wavelength output has certain shortcomings and needs to be further improved. Summary of the invention

[0006] In order to overcome the shortcomings of traditional multi-wavelength output systems such as a small number of wavelengths, unstable output and low output power, the present invention provides a stable optical pulse generation system capable of outputting high-power multi-wavelengths, which obtains more wavelengths through a seed pulse source module, and further amplifies the pulse power and improves the output stability through a power amplifier module and a pulse width compression stable output module to obtain high-power stable pulse output.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A high-stability, high-power, multi-wavelength optical pulse generation system, comprising: an output end of a seed pulse source 1 is connected to an input end of a pulse width extension module 2, an output end of the pulse width extension module 2 is connected to an input end of a power amplifier module 3, an output end of the power amplifier module 3 is connected to an input end of a shaping optical path module 4, and an output end of the shaping optical path module 4 is connected to an input end of a pulse width compression and stabilization output module 5;

[0009] The structure of the seed pulse source module 1 is as follows: the first pump source 101 is connected to the 980nm end of the first wavelength division multiplexer 102, the common end of the first wavelength division multiplexer 102 is connected to the 45% input end of the first coupler 120 through the first erbium-doped fiber 103 and the first single-mode fiber 104, the 45% output end of the first coupler 120 is connected to the input and output end of the first collimator 105, the optical pulse is connected to the input end of the first polarization-dependent optical isolator 110 through the first collimator 105, the first polarizer 106, the first quarter-wave plate 107, the first half-wave plate 108, and the second quarter-wave plate 109, and the output end of the first polarization-dependent optical isolator 110 is connected to the second polarizer 111, the third quarter-wave plate 109, and the output end of the first polarization-dependent optical isolator 110 is connected to the second polarizer 111, the third quarter-wave plate 108, and the second quarter-wave plate 109. The first half-wave plate 112, the second half-wave plate 113, the fourth quarter-wave plate 114, and the input end of the second collimator 115 are connected, the output end of the second collimator 115 is connected to the input end of the third polarizer 116, the output end of the third polarizer 116 is connected to the input end of the first polarization controller 117 through the polarization-maintaining fiber, the output end of the first polarization controller 117 is connected to the input end of the second polarization controller 118 through the polarization-maintaining fiber, the output end of the second polarization controller 118 is connected to the input end of the fourth polarizer 119 through the polarization-maintaining fiber, and the output end of the fourth polarizer 119 is connected to the common end of the wavelength division multiplexer 102; the 50% input end of the first coupler 120 is connected to the input end of the third collimator 121, and the optical pulse The optical fiber 126 is connected to the third port of the first optical circulator 126 via the third collimator 121, the fifth polarizer 122, the fifth quarter wave plate 123, the third half wave plate 124, and the sixth quarter wave plate 125. The first port of the first optical circulator 126 is connected to the input end of the second coupler 135 via the second single-mode optical fiber 127. The output end of the second coupler 135 is connected to the input end of the fifth collimator 145. The output end of the fifth collimator 145 is connected to the first beam splitter 136. A part of the light pulse of the first beam splitter 136 is transmitted to the first reflector 137. The light reflected by the first reflector 137 is transmitted to the second beam splitter 138. Another part of the light pulse of the first beam splitter 138 is transmitted to the second reflector 138. The light pulse reflected by the second reflector 139 is transmitted to the second beam splitter 138, and the light pulse through the second beam splitter 138 is transmitted to the input end of the sixth collimator 139, the output end of the sixth collimator 139 is connected to the output end of the third coupler 140, one output end of the third coupler 140 is connected to the input end of the third polarization controller 141, the output end of the third polarization controller 141 is connected to the input end of the fourth polarization controller 143 through the first high birefringence optical fiber 142, and the output end of the fourth polarization controller 143 is connected to the output end of the third coupler 140 through the second high birefringence optical fiber 144; the output end of the first beam splitter 136 and the second coupler 135 are connected to the third port of the second optical circulator 130;The second port of the first optical circulator 126 is connected to one end of the first polarization-maintaining optical fiber 128, and the other end of the first polarization-maintaining optical fiber 128 is connected to the second port of the second optical circulator 129. The optical pulse passes through the first port of the second optical circulator 129, the seventh quarter-wave plate 130, the fourth half-wave plate 131, the eighth quarter-wave plate 132, the sixth polarizer 133, and is connected to the input end of the fourth collimator 134. The output end of the fourth collimator 134 is connected to the 50% output end of the first coupler 120; and finally, it is output from the 10% output port of the first coupler 120.

[0010] The pulse width extension module 2 has the following optical path structure: the optical pulse is transmitted to the fifth half-wave plate 204 and the first polarization beam splitter 203 through the output end of the seventh collimator 205; the light beam is transmitted to the ninth quarter-wave plate 202 and the first polarization beam splitter 203 through the chirped volume Bragg grating 201; the optical pulse transmitted through the first polarization beam splitter 203 is transmitted to the first convex lens 206, the optical pulse transmitted from the first convex lens 206 is transmitted to the input end of the first optical isolator 209 through the first photonic bandgap fiber 207 and the second convex lens 208, the optical pulse is transmitted from the output end of the first optical isolator 209 to the third convex lens 210, and is transmitted to the first optical isolator 209 through the second erbium-doped fiber 211. The light pulse is transmitted from the fourth convex lens 212 to the input end of the eighth collimator 213. The light pulse output from the output end of the eighth collimator 213 is transmitted to the third reflector 214. The light pulse reflected by the third reflector 214 is transmitted to the fourth reflector 215. After being reflected by the fourth reflector 215, it is transmitted to the fifth reflector 216. After being reflected again, it is transmitted to the sixth reflector 218. After being reflected by the sixth reflector 218, it is transmitted to the first grating 220. The first grating 220 transmits the light pulse to the seventh reflector 221, and then reflects it to the eighth reflector 222. The eighth reflector 222 reflects the light pulse back to the first grating 220. The output pulse is transmitted to the ninth reflector 224 via the fifth convex lens 223 and then reflected back to the first grating 220 via the fifth convex lens 223. The light pulse is transmitted to the seventh reflector 221 via the first grating 220. The light pulse reflected by the seventh reflector 221 is reflected by the eighth reflector 222 and then incident on the first grating 220. The light pulse output by the first grating 220 is incident on the Porro prism 225 and reflected back to the first grating 220 via the Porro prism 225. After passing through the first grating 220, the light pulse passes through the seventh reflector 221, the eighth reflector 222, the first grating 220, the fifth convex lens 223, and the ninth reflector 224 again according to the route described above, and after multiple reflections, returns to the optical system 210. On the first grating 220, the light pulse is transmitted to the tenth reflector 219 through the first grating 220, reflected to the eleventh reflector 217, transmitted to the twelfth reflector 226 through the eleventh reflector 217, input through the input end of the ninth collimator 227, transmitted to the tenth convex lens 228 through the output end of the ninth collimator 227, transmitted to the eleventh convex lens 230 and the twelfth convex lens 231 through the second photonic bandgap fiber 229, and then transmitted to the second chirped volume Bragg grating 234 through the third erbium-doped fiber 232, and the light pulse is transmitted from the second chirped volume Bragg grating 234 to the thirteenth reflector 235, and output after being reflected by the thirteenth reflector 235;

[0011] The power amplifier module 3 has the following optical path structure: the optical pulse is transmitted to the passive optical fiber 302 via the semiconductor saturable absorber mirror (SESAM) 301, the fourth erbium-doped optical fiber 303 is connected to the input end of the first fiber Bragg grating 304, the output end of the first fiber Bragg grating 304 is connected to the common end of the second wavelength division multiplexer 305, the 980nm end of the second wavelength division multiplexer 305 is connected to the second pump source 306, the other common end of the second wavelength division multiplexer 305 is connected to the input end of the second isolator 307, the output end of the second isolator 307 is connected to the input end of the tenth collimator 308, the optical pulse is transmitted to the fourteenth reflector 309 via the output end of the tenth collimator 308, and is reflected to the fifteenth reflector 310. The light pulse is then transmitted to the thirteenth convex lens 311. The light pulse passes through the thirteenth convex lens 311, the acousto-optic modulator 312, the fourteenth convex lens 313, the third isolator 314 and the sixth half-wave plate 315 and is incident on the fourteenth reflector 316. The light pulse is reflected by the fourteenth reflector 316 to the fifteenth reflector 317 and is incident on the fifteenth convex lens 318. The light pulse passes through the fifteenth convex lens 318, the eleventh collimator 319, the fourth erbium-doped fiber 320, the twelfth collimator 321 and the sixteenth convex lens 322 and is incident on the sixteenth reflector 323. The pump light generated by the first photodiode 327 passes through the thirteenth collimator 326 and the seventeenth convex lens 325 and is merged with the light pulse previously incident on the sixteenth reflector 323. The fused light pulse is reflected by the sixteenth reflector 323 to the seventeenth reflector 324, and the seventeenth reflector 324 reflects the light pulse to the seventh half-wave plate 328. The light pulse is incident on the first grating 335 after passing through the seventh half-wave plate 328, the tenth quarter-wave plate 329, the bandpass filter 330, and the eleventh quarter-wave plate 331. The light pulse is transmitted to the second grating 336 through the first grating 335, and the second grating 336 transmits the light pulse to the eighteenth reflector 337. The eighteenth reflector 337 reflects the pulse back to the second grating 336, and the light pulse is transmitted to the first grating 335 through the second grating 336. The light pulse output by the first grating 335 is transmitted to the nineteenth reflector 332, and is reflected by the nineteenth reflector 332 to the twelfth quarter-wave plate 333, and finally output through the second polarization beam splitter 334;

[0012] The shaping optical path module 4 has the following optical path structure: the optical pulse is transmitted to the eighth half-wave plate 401, and enters the first beam expander 403 after being reflected by the twentieth reflector 406 and the twenty-first reflector 402. The optical pulse passes through the first beam expander 403 and is then reflected by the twenty-second reflector 404 to the first spatial light modulator 405. The light beam modulated by the first spatial light modulator 405 is focused by the eighteenth convex lens 407, the nineteenth convex lens 408, and the twentieth convex lens 409 and incident on the first feedback device 410. The optical pulse is transmitted from the first feedback device 410 to the fourteenth collimator 411, and is transmitted to the polarizer 412 through the output end of the fourteenth collimator 411 and incident on the twenty-third reflector 413. The twenty-third reflector 413 is reflected to the spectrum shaping filter 414. The optical pulse output by the spectrum shaping filter 414 is focused by the twenty-fourth reflector 415. , after being reflected by the twenty-fifth reflecting mirror 416, the optical pulse output from the spectrum shaping filter 414 is reflected by the twenty-sixth reflecting mirror 417 to the twenty-seventh reflecting mirror 418, the twenty-seventh reflecting mirror 418 reflects the optical pulse to the first spectrum shaping grating 419, the first spectrum shaping grating 419 reflects the optical pulse to the twenty-eighth reflecting mirror 422 and then reflects it to the first spectrum shaping concave mirror 423, the optical pulse passes through the first spectrum shaping concave mirror 423 and the second spatial light modulator 424, and is transmitted to the second spectrum shaping concave mirror 425, the second spectrum shaping concave mirror 425 reflects the optical pulse to the twenty-ninth reflecting mirror 426, the optical pulse is then reflected by the twenty-ninth reflecting mirror 426 to the second spectrum shaping grating 420 and then reflected to the thirtieth reflecting mirror 421, the output of the thirtieth reflecting mirror 421 is the output of the spectrum shaping module 4;

[0013] The pulse width compression stable output module 5 has the following optical path structure: the light pulse passes through the third polarization beam splitter 501 and is incident on the fourth polarization beam splitter 502. Part of the light pulse passing through the fourth polarization beam splitter 502 is transmitted to the thirty-first reflector 503. After being reflected by the thirty-first reflector 503, the light pulse passes through the thirty-second reflector 504, the thirty-third reflector 505, and the thirty-fourth reflector 506 in sequence. The light pulse reflected by the thirty-fourth reflector 506 is incident on the third grating 512. The third grating 512 reflects the light pulse to the fourth grating 513. The fourth grating 513 reflects the light pulse to the thirty-fifth reflector 514. After the light pulse reaches the thirty-fifth reflector 514, it is reflected back according to the input route. The third grating 512 transmits the light pulse to the thirty-sixth reflector 515. The light pulse is reflected by the thirty-sixth reflector 515 to the thirty-seventh reflector 517, and is incident on the twenty-first convex lens 534 through the thirty-seventh reflector 517. Another part of the light pulse output from the fourth polarization beam splitter 502 is transmitted to the thirty-eighth reflector 507. After being reflected by the fourth polarization beam splitter 502, the light pulse passes through the thirty-ninth reflector 508, the fortieth reflector 509, the forty-first reflector 510, and the forty-second reflector 511 in sequence. The light pulse reflected by the forty-second reflector 511 and the light pulse reflected by the thirty-fourth reflector 506 enter the third grating 512 in parallel, and is incident on the thirty-fourth reflector 506 as described above. The incident path of the light pulse incident on the third grating 512 by the reflector 506 passes through the third grating 512, the fourth grating 513, and the thirty-fifth reflector 514 in sequence and returns to the third grating 512 along the input path. The light pulse is transmitted from the third grating 512 to the thirty-sixth reflector 515. The light pulse is reflected by the thirty-sixth reflector 515 to the forty-third reflector 516, and is incident on the twenty-first convex lens 534 through the forty-third reflector 516. The light pulse is transmitted from the other output end of the third polarization beam splitter 501 to the forty-fourth reflector 518, and is transmitted to the fifth polarization beam splitter 519 through the forty-fourth reflector 518. Part of the light pulse passing through the fifth polarization beam splitter 519 is transmitted to the forty-fifth reflector 520. After being reflected by the forty-fifth reflector 520, the light pulse is reflected by the forty-sixth reflector 521, the forty-seventh reflector 522, and the forty-eighth reflector 523 in sequence. The light pulse reflected by the forty-eighth reflector 523 is incident on the fifth grating 529. The fifth grating 529 reflects the light pulse to the sixth grating 530. The sixth grating 530 reflects the light pulse to the forty-ninth reflector 531. After reaching the forty-ninth reflector 531, the light pulse is reflected back to the fifth grating 529 according to the input route. The fifth grating 529 transmits the light pulse to the fiftieth reflector 528. The light pulse is reflected by the fiftyth reflector 528 to the fifty-first reflector 533, and is incident on the twenty-first convex lens 534 through the fifty-first reflector 533.Another part of the light pulse output from the fifth polarization beam splitter 519 is transmitted to the fifty-second reflector 524. After being reflected by the fifty-second reflector 524, the light pulse passes through the fifty-third reflector 525, the fifty-fourth reflector 526, the fifty-fifth reflector 527, and the fifty-sixth reflector 528 in sequence. The light pulse reflected by the fifty-sixth reflector 528 enters the fifth grating 529 in parallel with the light pulse reflected by the forty-eighth reflector 523, and passes through the sixth grating 530 and the forty-ninth reflector 531 in sequence and returns to the fifth grating 529 along the input route. The light pulse is transmitted from the fifth grating 529 to the fiftieth reflector 528. The light pulse is reflected by the fiftieth reflector 528 to the fifty-seventh reflector 532, and passes through the fifty-seventh reflector 532. The four light pulses incident on the twenty-first convex lens 534, respectively passing through the forty-third reflector 516, the thirty-seventh reflector 517, the fifty-seventh reflector 532, and the fifty-first reflector 533 enter the twenty-first convex lens 534 in parallel. The light pulses are focused by the twenty-first convex lens 534 and then merged. The merged light pulses are reflected by the fifty-eighth reflector 535 to the fifty-ninth reflector 536, and are reflected by the fifty-ninth reflector 536 to the sixtieth reflector 537 and the sixty-first reflector 538. The light pulses are transmitted to the ninth half-wave plate 539 through the sixty-first reflector 538, and enter the second beam expander 557 after being reflected by the sixty-second reflector 540 and the sixty-third reflector 558. The light pulses are then reflected by the second beam expander 557. The sixty-fourth reflector 556 reflects the light onto the third spatial light modulator 541. The light beam modulated by the third spatial light modulator 541 is focused by the twenty-second convex lens 542, the twenty-third convex lens 543, and the twenty-fourth convex lens 544 and incident on the second feedback device 545. The light pulse is transmitted by the second feedback device 545 to the fifteenth collimator 546, and is transmitted to the sixty-fifth reflector 547 and the sixty-sixth reflector 548 via the fifteenth collimator 546. The light pulse is reflected by the sixty-sixth reflector 548 to the tenth half-wave plate 549, and is incident on the sixth polarization beam splitter 550 via the tenth half-wave plate 549. The light pulse outputted from the output end of the sixth polarization beam splitter 550 parallel to the incident direction is transmitted to the sixty-seventh reflector 551. The light pulse is reflected by the sixty-seventh reflector 551 to the sixty-eighth reflector 552, and then reflected by the sixty-eighth reflector 552 to the sixty-ninth reflector 553 and then reflected by the seventyth reflector 554. The light pulse reflected by the seventyth reflector 554 is incident on the twenty-fifth convex lens 555. The light pulse is incident on the seventy-first reflector 559 through the twenty-fifth convex lens 555. The light pulse output by the seventy-first reflector 559 is transmitted to the seventy-second reflector 561 through the tenth half-wave plate 560. After being reflected by the seventy-second reflector 561 to the third spectrum shaping concave mirror 565, the light pulse is incident on the fourth spectrum shaping concave mirror 563 through the BBO crystal 564, and then reflected by the third spectrum shaping concave mirror 565 to the seventy-third reflector 569.The light pulse output perpendicular to the incident direction from the sixth polarization beam splitter 550 is reflected by the seventy-fourth reflector 570, and then merged with the light pulse reflected by the seventy-third reflector 569. The merged light pulse is incident on the seventh polarization beam splitter 571. The light pulse output from the seventh polarization beam splitter 571 is incident on the fifth spectrum shaping concave mirror 572. The light pulse passes through the fifth spectrum shaping concave mirror 572 and passes through the MgO:PPLN crystal 573 to be incident on the sixth shaping concave mirror 574. The light pulse is reflected by the sixth shaping concave mirror 574 to the seventy-fifth reflector 562, and then is incident on the fourth spectrum shaping concave mirror 563 through the seventy-fifth reflector 562. The light pulse is transmitted to the fourth spectrum shaping concave mirror 563 and then The light pulse passes through the fourth spectrum shaping concave mirror 563, the BBO crystal 564, the third spectrum shaping concave mirror 565, the seventy-third reflector 569, the seventh polarization beam splitter 571, the fifth spectrum shaping concave mirror 572, the MgO:PPLN crystal 573, the sixth spectrum shaping concave mirror 574, and the seventy-fifth reflector 562 for multiple reflections. The light pulse returns to the third spectrum shaping concave mirror 565 after multiple reflections. The light pulse is transmitted through the third spectrum shaping concave mirror 565 and output to the twenty-sixth convex lens 566. The light pulse output from the twenty-sixth convex lens 566 is transmitted through the seventy-sixth reflector 567 and the seventy-seventh reflector 568 to the sixteenth collimator 575, and is transmitted to the fourth coupling lens 565 through the sixteenth collimator 575. The optical pulse transmitted by the fourth coupler 576 is connected to the third wavelength division multiplexer 577. The other end of the third wavelength division multiplexer 577 is connected to the fourth isolator 579 through the fifth erbium-doped optical fiber 578. The optical pulse is connected to the seventeenth collimator 580 through the fourth isolator 579. The optical pulse transmitted from the seventeenth collimator 580 is connected to the eighteenth collimator 582 after being reflected by the seventy-eighth reflector 581. The optical pulse transmitted from the eighteenth collimator 582 is connected to the nineteenth collimator 585 through the first few-mode polarization controller 583 and the second few-mode polarization controller 584. The optical pulse transmitted by the nineteenth collimator 585 is transmitted to the twentieth collimator 587 after being reflected by the seventy-ninth reflector 586. The pulse is transmitted to the input end of the seventh polarizer 588 via the twentieth collimator 587, the output end of the seventh polarizer 588 is connected to the third few-mode polarization controller 589, the optical pulse is transmitted to the high nonlinear optical fiber 590 via the third few-mode polarization controller 589, the optical pulse transmitted via the high nonlinear optical fiber 590 is incident on the twenty-first collimator 591 and then reflected by the eightieth reflector 592, the optical pulse reflected by the eightieth reflector 592 is transmitted to the fifth coupler 594 via the twenty-second collimator 593, and is transmitted to the twenty-third collimator 595 via the fifth coupler 594, the optical pulse is transmitted to the eighty-first reflector via the twenty-third collimator 595, the optical pulse is transmitted to the twenty-fourth collimator 597 after being reflected,The output end of the twenty-fourth collimator 597 is connected to the common end of the third wavelength division multiplexer 577; the output end of the fifth coupler 594 is the output of the pulse compression stable output module 5, which is used to finally output the optical pulse.

[0014] Beneficial effects:

[0015] 1. The present invention utilizes multiple hybrid filters to design a multi-wavelength pulse seed source to achieve multi-wavelength output.

[0016] 2. The present invention utilizes gratings and optical lenses to design a multi-stage power amplification structure to achieve high-power pulse output.

[0017] 3. The present invention utilizes optical lenses, light modulators, etc. to modulate spatial light to achieve narrow pulse output.

[0018] 4. The present invention utilizes a polarization controller based on a few-mode fiber filter and an optical lens to design multi-stage, multi-channel pulse compression, thereby ensuring stable multi-wavelength ultrashort pulse output through pulse compression and nonlinear polarization rotation effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the overall structural block diagram of the present invention.

[0020] Figure 2 This is the optical path diagram of the seed pulse source module used in the present invention.

[0021] Figure 3 This is the optical path diagram of the pulse width extension module used in the present invention.

[0022] Figure 4 It is the optical path diagram of the power amplifier module used in the present invention.

[0023] Figure 5 This is a light path diagram of the shaping light path module used in the present invention.

[0024] Figure 6 This is the optical path diagram of the pulse compression stable output module used in the present invention. DETAILED DESCRIPTION

[0025] The working principle of the present invention is further described below in conjunction with the accompanying drawings. It should be understood that the component parameters marked in the embodiments are preferred parameters used in each embodiment, rather than limiting the scope of protection.

[0026] Embodiment 1 Overall structure of the present invention

[0027] like Figure 1As shown, the overall structure of the present invention includes: the output end of the seed pulse source 1 is connected to the input end of the pulse width extension module 2, the output end of the pulse width extension module 2 is connected to the input end of the power amplifier module 3, the output end of the power amplifier module 3 is connected to the input end of the shaping optical path module 4, and the output end of the shaping optical path module 4 is connected to the input end of the pulse width compression stabilization output module 5.

[0028] Example 2 Seed pulse source module

[0029] The structure of the seed pulse source module 1 is as follows Figure 2As shown: the first pump source 101 is connected to the 980nm end of the first wavelength division multiplexer 102, the common end of the first wavelength division multiplexer 102 is connected to the 45% input end of the first coupler 120 through the first erbium-doped fiber 103 and the first single-mode fiber 104, the 45% output end of the first coupler 120 is connected to the input and output end of the first collimator 105, the optical pulse is connected to the input end of the first polarization-dependent optical isolator 110 through the first collimator 105, the first polarizer 106, the first quarter wave plate 107, the first half wave plate 108, and the second quarter wave plate 109, and the output end of the first polarization-dependent optical isolator 110 is connected to the second polarizer 111, the third quarter wave plate 112, the second half wave plate 113, and the output end of the first polarization-dependent optical isolator 110. 13. The fourth quarter wave plate 114 is connected to the input end of the second collimator 115, the output end of the second collimator 115 is connected to the input end of the third polarizer 116, the output end of the third polarizer 116 is connected to the input end of the first polarization controller 117 through the polarization-maintaining fiber, the output end of the first polarization controller 117 is connected to the input end of the second polarization controller 118 through the polarization-maintaining fiber, the output end of the second polarization controller 118 is connected to the input end of the fourth polarizer 119 through the polarization-maintaining fiber, and the output end of the fourth polarizer 119 is connected to the common end of the wavelength division multiplexer 102; the other 50% input end of the first coupler 120 is connected to the input end of the third collimator 121, and the optical pulse is connected to the third collimator 121 through the third collimator 12 1. The fifth polarizer 122, the fifth quarter wave plate 123, the third half wave plate 124, and the sixth quarter wave plate 125 are connected to the third port of the first optical circulator 126. The first port of the first optical circulator 126 is connected to the input end of the second coupler 135 through the second single-mode optical fiber 127. The output end of the second coupler 135 is connected to the input end of the fifth collimator 145. The output end of the fifth collimator 145 is connected to the first beam splitter 136. A portion of the light pulses of the first beam splitter 136 are transmitted to the first reflector 137. The light reflected by the first reflector 137 is transmitted to the second beam splitter 138. Another portion of the light pulses of the first beam splitter 138 are transmitted to the second reflector 138. The light pulse reflected by the reflector 139 is transmitted to the second beam splitter 138, and the light pulse via the second beam splitter 138 is transmitted to the input end of the sixth collimator 139, the output end of the sixth collimator 139 is connected to the output end of the third coupler 140, one output end of the third coupler 140 is connected to the input end of the third polarization controller 141, the output end of the third polarization controller 141 is connected to the input end of the fourth polarization controller 143 via the first high-birefringence optical fiber 142, and the output end of the fourth polarization controller 143 is connected to the output end of the third coupler 140 via the second high-birefringence optical fiber 144; the output ends of the first beam splitter 136 and the second coupler 135 are connected to the third port of the second optical circulator 130;The second port of the first optical circulator 126 is connected to one end of the first polarization-maintaining fiber 128, and the other end of the first polarization-maintaining fiber 128 is connected to the second port of the second optical circulator 129. The optical pulse passes through the first port of the second optical circulator 129, the seventh quarter-wave plate 130, the fourth half-wave plate 131, the eighth quarter-wave plate 132, the sixth polarizer 133 and is connected to the input end of the fourth collimator 134. The output end of the fourth collimator 134 is connected to a 50% output end of the first coupler 120; and finally outputted from the other 10% output port of the first coupler 120. ;

[0030] The seed pulse source module can divide and select the input optical signal in the frequency domain by utilizing the comb filtering effect of the Sagnac ring filter, Lyot filter, and double-pass Mach-Zehnder interferometer, so that the laser can generate multiple equally spaced or unequally spaced wavelength outputs in a wider spectral range, thereby realizing multi-wavelength mode-locked laser pulse output; at the same time, it helps to suppress the mode competition between different wavelengths, so that multiple wavelengths can stably generate mode-locked pulses at the same time, thereby improving the stability and reliability of multi-wavelength output.

[0031] Example 3 Pulse Width Extension Module

[0032] The optical path schematic diagram of the pulse width extension module 2 is as follows Figure 3As shown: the light pulse is transmitted to the fifth half-wave plate 204 and the first polarization beam splitter 203 through the output end of the seventh collimator 205; the light beam is transmitted to the ninth quarter-wave plate 202 and the first polarization beam splitter 203 through the chirped volume Bragg grating 201; the light pulse through the first polarization beam splitter 203 is transmitted to the first convex lens 206, and the light pulse transmitted from the first convex lens 206 is transmitted to the input end of the first optical isolator 209 through the first photonic bandgap fiber 207 and the second convex lens 208, and the light pulse is transmitted from the output end of the first optical isolator 209 to the third convex lens 210, and is transmitted to the fourth convex lens 212 through the second erbium-doped fiber 211, and the light pulse is transmitted from The fourth convex lens 212 transmits the light pulse to the input end of the eighth collimator 213. The light pulse outputted from the output end of the eighth collimator 213 is transmitted to the third reflector 214. The light pulse reflected by the third reflector 214 is transmitted to the fourth reflector 215. After being reflected by the fourth reflector 215, it is transmitted to the fifth reflector 216. After being reflected again, it is transmitted to the sixth reflector 218. After being reflected by the sixth reflector 218, it is transmitted to the first grating 220. The first grating 220 transmits the light pulse to the seventh reflector 221, and then reflects it to the eighth reflector 222. The eighth reflector 222 reflects the light pulse back to the first grating 220. The pulse outputted by the first grating 220 is transmitted to the fifth reflector 216. The light pulse is transmitted from the convex lens 223 to the ninth reflector 224 and then reflected back to the first grating 220 by the fifth convex lens 223. The light pulse is transmitted to the seventh reflector 221 by the first grating 220. The light pulse reflected by the seventh reflector 221 is reflected by the eighth reflector 222 and then incident on the first grating 220. The light pulse output by the first grating 220 is incident on the Porro prism 225 and reflected back to the first grating 220 by the Porro prism 225. After passing through the first grating 220, the light pulse passes through the seventh reflector 221, the eighth reflector 222, the first grating 220, the fifth convex lens 223, and the ninth reflector 224 again according to the route described above, and returns to the first grating after multiple reflections. On 220, the light pulse is transmitted to the tenth reflector 219 through the first grating 220, reflected to the eleventh reflector 217, and transmitted to the twelfth reflector 226 through the eleventh reflector 217. The light pulse is input through the input end of the ninth collimator 227, transmitted to the tenth convex lens 228 through the output end of the ninth collimator 227, transmitted to the eleventh convex lens 230 and the twelfth convex lens 231 through the second photonic bandgap fiber 229, and then transmitted to the second chirped body Bragg grating 234 through the third erbium-doped fiber 232. The light pulse is transmitted from the second chirped body Bragg grating 234 to the thirteenth reflector 235, and output after being reflected by the thirteenth reflector 235.

[0033] The pulse width extension module 2 can increase the pulse width, change the spectrum characteristics, optimize the energy characteristics, and thus enhance the multi-wavelength output characteristics.

[0034] Embodiment 4 Power amplifier module

[0035] The optical path diagram of the power amplifier module 3 is as follows: Figure 4 As shown in the figure: the optical pulse is transmitted to the passive optical fiber 302 through the semiconductor saturable absorber mirror (SESAM) 301, the fourth erbium-doped optical fiber 303 is connected to the input end of the first fiber Bragg grating 304, the output end of the first fiber Bragg grating 304 is connected to the common end of the second wavelength division multiplexer 305, the 980nm end of the second wavelength division multiplexer 305 is connected to the second pump source 306, the other common end of the second wavelength division multiplexer 305 is connected to the input end of the second isolator 307, the output end of the second isolator 307 is connected to the input end of the tenth collimator 308, the optical pulse is transmitted to the fourteenth reflector 309 through the output end of the tenth collimator 308, reflected to the fifteenth reflector 310 and transmitted to the thirteenth The optical pulse passes through the thirteenth convex lens 311, the acousto-optic modulator 312, the fourteenth convex lens 313, the third isolator 314, and the sixth half-wave plate 315 and is incident on the fourteenth reflector 316. The optical pulse is reflected by the fourteenth reflector 316 to the fifteenth reflector 317 and is incident on the fifteenth convex lens 318. The optical pulse passes through the fifteenth convex lens 318, the eleventh collimator 319, the fourth erbium-doped fiber 320, the twelfth collimator 321, and the sixteenth convex lens 322 and is incident on the sixteenth reflector 323. The pump light generated by the first photodiode 327 passes through the thirteenth collimator 326 and the seventeenth convex lens 325 and is merged with the optical pulse previously incident on the sixteenth reflector 323. The fused light pulse is reflected by the sixteenth reflector 323 to the seventeenth reflector 324, and the seventeenth reflector 324 reflects the light pulse to the seventh half-wave plate 328. The light pulse is incident on the first grating 335 after passing through the seventh half-wave plate 328, the tenth quarter-wave plate 329, the bandpass filter 330, and the eleventh quarter-wave plate 331. The light pulse is transmitted to the second grating 336 through the first grating 335, and the second grating 336 transmits the light pulse to the eighteenth reflector 337. The eighteenth reflector 337 reflects the pulse back to the second grating 336, and the light pulse is transmitted to the first grating 335 through the second grating 336. The light pulse output by the first grating 335 is transmitted to the nineteenth reflector 332, and is reflected by the nineteenth reflector 332 to the twelfth quarter-wave plate 333, and finally output through the second polarization beam splitter 334.

[0036] The power amplifier module 3 compresses the spectral width of the pulse, reduces the pulse repetition frequency, increases the pulse energy, and performs pre-shaping to compensate for the loss caused by placing the acousto-optic modulator in the configuration.

[0037] Embodiment 5 Shaping optical path module

[0038] The optical path structure diagram of the shaping optical path module 4 is as follows Figure 5As shown: the light pulse is transmitted to the eighth half-wave plate 401, and enters the first beam expander 403 after being reflected by the twentieth reflector 406 and the twenty-first reflector 402. After passing through the first beam expander 403, the light pulse is reflected by the twenty-second reflector 404 to the first spatial light modulator 405. The light beam modulated by the first spatial light modulator 405 is focused by the eighteenth convex lens 407, the nineteenth convex lens 408, and the twentieth convex lens 409 and incident on the first feedback device 410. The light pulse is transmitted from the first feedback device 410 to the fourteenth collimator 411, and is transmitted to the polarizer 412 through the output end of the fourteenth collimator 411 and incident on the twenty-third reflector 413. It is reflected by the twenty-third reflector 413 to the spectrum shaping filter 414. The light pulse output by the spectrum shaping filter 414 is focused by the twenty-fourth reflector 415 and the twenty-fifth reflector After being reflected by the mirror 416, the light pulse is reflected back to the spectrum shaping filter 414 again. The light pulse output from the spectrum shaping filter 414 is reflected by the twenty-sixth reflecting mirror 417 to the twenty-seventh reflecting mirror 418. The twenty-seventh reflecting mirror 418 reflects the light pulse to the first spectrum shaping grating 419. The first spectrum shaping grating 419 reflects the light pulse to the twenty-eighth reflecting mirror 422 and then to the first spectrum shaping concave mirror 423. After passing through the first spectrum shaping concave mirror 423 and the second spatial light modulator 424, the light pulse is transmitted to the second spectrum shaping concave mirror 425. The second spectrum shaping concave mirror 425 reflects the light pulse to the twenty-ninth reflecting mirror 426. The light pulse is then reflected by the twenty-ninth reflecting mirror 426 to the second spectrum shaping grating 420 and then to the thirtieth reflecting mirror 421. The output of the thirtieth reflecting mirror 421 is the output of the spectrum shaping module 4.

[0039] The shaping optical path module 4 realizes further pulse width compression and shift of the central wavelength of the optical pulse, the spectral characteristics are effectively improved, the coordination between the wavelengths is enhanced, the stability is better, and high-energy multi-wavelength pulses are output.

[0040] Embodiment 6 Pulse width compression stable output module

[0041] The optical path structure diagram of the pulse width compression stable output module 5 is as follows Figure 6As shown: the light pulse passes through the third polarization beam splitter 501 and is incident on the fourth polarization beam splitter 502. Part of the light pulse passing through the fourth polarization beam splitter 502 is transmitted to the thirty-first reflector 503. After being reflected by the thirty-first reflector 503, the light pulse is sequentially reflected by the thirty-second reflector 504, the thirty-third reflector 505, and the thirty-fourth reflector 506. The light pulse reflected by the thirty-fourth reflector 506 is incident on the third grating 512. The third grating 512 reflects the light pulse to the fourth grating 513. The fourth grating 513 reflects the light pulse to the thirty-fifth reflector 514. After reaching the thirty-fifth reflector 514, the light pulse is reflected back to the third grating 512 according to the input route. The third grating 512 transmits the light pulse to the third grating 512. The light pulse is reflected by the thirty-sixth reflector 515 to the thirty-seventh reflector 517, and is incident on the twenty-first convex lens 534 through the thirty-seventh reflector 517. Another part of the light pulse output from the fourth polarization beam splitter 502 is transmitted to the thirty-eighth reflector 507. After being reflected by the fourth polarization beam splitter 502, the light pulse passes through the thirty-ninth reflector 508, the fortieth reflector 509, the forty-first reflector 510, and the forty-second reflector 511 in sequence. The light pulse reflected by the forty-second reflector 511 enters the third grating 512 in parallel with the light pulse reflected by the thirty-fourth reflector 506. According to the above, the incident path of the light pulse incident on the third grating 512 from the thirty-fourth reflector 506 is sequentially The light pulse passes through the third grating 512, the fourth grating 513, the thirty-fifth reflector 514 and returns to the third grating 512 along the input route. The light pulse is transmitted from the third grating 512 to the thirty-sixth reflector 515. The light pulse is reflected by the thirty-sixth reflector 515 to the forty-third reflector 516. The light pulse is incident on the twenty-first convex lens 534 through the forty-third reflector 516. The light pulse is transmitted from the other output end of the third polarization beam splitter 501 to the forty-fourth reflector 518. The light pulse is transmitted to the fifth polarization beam splitter 519 through the forty-fourth reflector 518. Part of the light pulse passing through the fifth polarization beam splitter 519 is transmitted to the forty-fifth reflector 520. After being reflected by the forty-fifth reflector 520, the light pulse passes through the forty-sixth reflector 521, The light pulse is reflected by the forty-seventh reflector 522 and the forty-eighth reflector 523. The light pulse reflected by the forty-eighth reflector 523 is incident on the fifth grating 529. The fifth grating 529 reflects the light pulse to the sixth grating 530. The sixth grating 530 reflects the light pulse to the forty-ninth reflector 531. After reaching the forty-ninth reflector 531, the light pulse is reflected back to the fifth grating 529 according to the input route. The fifth grating 529 transmits the light pulse to the fiftieth reflector 528. The light pulse is reflected by the fiftieth reflector 528 to the fifty-first reflector 533. The light pulse is incident on the twenty-first convex lens 534 via the fifty-first reflector 533. Another part of the light pulse output from the fifth polarization beam splitter 519 is transmitted to the fifty-second reflector 524.After being reflected by the fifty-second reflector 524, the light pulse passes through the fifty-third reflector 525, the fifty-fourth reflector 526, the fifty-fifth reflector 527, and the fifty-sixth reflector 528 in sequence. The light pulse reflected by the fifty-sixth reflector 528 enters the fifth grating 529 in parallel with the light pulse reflected by the forty-eighth reflector 523. According to the above-mentioned incident route of the light pulse incident on the fifth grating 529 from the forty-eighth reflector 523, it passes through the fifth grating 529, the sixth grating 530, and the forty-ninth reflector 531 in sequence and returns to the fifth grating 529 along the input route. The light pulse is transmitted from the fifth grating 529 to the fiftieth reflector 528. The light pulse is reflected by the fiftieth reflector 528 to the fifty-seventh reflector 532. The four light pulses passing through the 43rd reflector 516, the 37th reflector 517, the 57th reflector 532 and the 51st reflector 533 respectively enter the 21st convex lens 534 in parallel. The light pulses are focused by the 21st convex lens 534 and then merged. The merged light pulses are reflected by the 58th reflector 535 to the 59th reflector 536. The 59th reflector 536 is reflected to the 60th reflector 537 and the 61st reflector 538. The light pulses are transmitted to the 9th half-wave plate 539 through the 61st reflector 538. After being reflected by the 62nd reflector 540 and the 63rd reflector 558, the light pulses enter the second beam expander 557. The light pulse is then reflected by the sixty-fourth reflector 556 to the third spatial light modulator 541. The light beam modulated by the third spatial light modulator 541 is focused by the twenty-second convex lens 542, the twenty-third convex lens 543, and the twenty-fourth convex lens 544 and incident on the second feedback device 545. The light pulse is transmitted by the second feedback device 545 to the fifteenth collimator 546, and is transmitted to the sixty-fifth reflector 547 and the sixty-sixth reflector 548 through the fifteenth collimator 546. The light pulse is reflected by the sixty-sixth reflector 548 to the tenth half-wave plate 549, and is incident on the sixth polarization beam splitter 550 through the tenth half-wave plate 549. The light pulse output from the output end of the sixth polarization beam splitter 550 parallel to the incident direction is transmitted to the sixty-seventh reflector 55 1. The light pulse is reflected by the sixty-seventh reflector 551 to the sixty-eighth reflector 552, and then reflected by the sixty-eighth reflector 552 to the sixty-ninth reflector 553 to the seventyth reflector 554. The light pulse reflected by the seventyth reflector 554 is incident on the twenty-fifth convex lens 555. The light pulse is incident on the seventy-first reflector 559 through the twenty-fifth convex lens 555. The light pulse output by the seventy-first reflector 559 is transmitted to the seventy-second reflector 561 through the tenth half-wave plate 560. After being reflected by the seventy-second reflector 561 to the third spectrum shaping concave mirror 565, the light pulse is incident on the fourth spectrum shaping concave mirror 563 through the BBO crystal 564, and then reflected by the third spectrum shaping concave mirror 565 to the seventy-third reflector 569.The light pulse output perpendicular to the incident direction through the sixth polarization beam splitter 550 is reflected by the seventy-fourth reflector 570, and then merged with the light pulse reflected by the seventy-third reflector 569. The merged light pulse is incident on the seventh polarization beam splitter 571. The light pulse output by the seventh polarization beam splitter 571 is incident on the fifth spectrum shaping concave mirror 572. The light pulse passes through the fifth spectrum shaping concave mirror 572 and passes through the MgO:PPLN crystal 573 to be incident on the sixth shaping concave mirror 574. The light pulse is reflected by the sixth shaping concave mirror 574 to the seventy-fifth reflector 562, and then is incident on the fourth spectrum shaping concave mirror 563 through the seventy-fifth reflector 562. After the light pulse is transmitted to the fourth spectrum shaping concave mirror 563, the light pulse is shaped as described above. The line passes through the fourth spectrum shaping concave mirror 563, the BBO crystal 564, the third spectrum shaping concave mirror 565, the seventy-third reflector 569, the seventh polarization beam splitter 571, the fifth spectrum shaping concave mirror 572, the MgO:PPLN crystal 573, the sixth spectrum shaping concave mirror 574, and the seventy-fifth reflector 562 again. After multiple reflections, the light pulse returns to the third spectrum shaping concave mirror 565. The light pulse is transmitted through the third spectrum shaping concave mirror 565 and output to the twenty-sixth convex lens 566. The light pulse output from the twenty-sixth convex lens 566 is transmitted through the seventy-sixth reflector 567 and the seventy-seventh reflector 568 to the sixteenth collimator 575, and is transmitted to the A fourth coupler 576, the optical pulse transmitted by the fourth coupler 576 is connected to a third wavelength division multiplexer 577, the other end of the third wavelength division multiplexer 577 is connected to a fourth isolator 579 through a fifth erbium-doped optical fiber 578, the optical pulse is connected to a seventeenth collimator 580 via the fourth isolator 579, the optical pulse transmitted from the seventeenth collimator 580 is reflected by a seventy-eighth reflector 581 and connected to an eighteenth collimator 582, the optical pulse transmitted from the eighteenth collimator 582 is connected to a nineteenth collimator 585 via a first few-mode polarization controller 583 and a second few-mode polarization controller 584, the optical pulse transmitted by the nineteenth collimator 585 is reflected by a seventy-ninth reflector 586 and transmitted to a twentieth collimator 587 The light pulse is transmitted to the input end of the seventh polarizer 588 through the twentieth collimator 587, and the output end of the seventh polarizer 588 is connected to the third few-mode polarization controller 589. The light pulse is transmitted to the high nonlinear optical fiber 590 through the third few-mode polarization controller 589. The light pulse transmitted through the high nonlinear optical fiber 590 is incident on the twenty-first collimator 591 and then reflected by the eightieth reflector 592. The light pulse reflected by the eightieth reflector 592 is transmitted to the fifth coupler 594 through the twenty-second collimator 593, and is transmitted to the twenty-third collimator 595 through the fifth coupler 594. The light pulse is transmitted to the eighty-first reflector through the twenty-third collimator 595, and the reflected light pulse is transmitted to the twenty-fourth collimator 597.The output end of the twenty-fourth collimator 597 is connected to the common end of the third wavelength division multiplexer 577; the output end of the fifth coupler 594 is the output of the pulse compression stable output module 5, which is used for outputting optical pulses of a high-stability, high-power, multi-wavelength optical pulse generation system of the present invention.

[0042] The pulse width compression stable output module 5 realizes further pulse width compression and shifting of the central wavelength of the optical pulse. At the same time, the optical signal-to-noise ratio can be stabilized by adjusting the polarization controller based on the few-mode fiber, making the output multi-wavelength pulse more stable.

[0043] Example 7 Working Principle of the Invention

[0044] The working principle of the present invention is explained with reference to the above embodiments and the accompanying drawings.

[0045] The Sagnac loop filter, Lyot filter, and double-pass Mach-Zehnder interferometer in the seed pulse source module 1 can divide and select the input optical signal in the frequency domain, so that the laser can generate multiple equally spaced or unequally spaced wavelength outputs in a wider spectral range, and realize multi-wavelength mode-locked laser pulse output; the pulse width extension module 2 can increase the pulse width, change the spectrum characteristics, optimize the energy characteristics, and thus enhance the multi-wavelength output characteristics. The power amplifier module 3 compresses the spectral width of the pulse, reduces the pulse repetition frequency, increases the pulse energy, and performs pre-shaping to compensate for the loss caused by placing the acousto-optic modulator 312 in the configuration. The shaping optical path module 4 realizes further pulse width compression and shifting of the central wavelength of the optical pulse, effectively improves the spectral characteristics, enhances the coordination between the wavelengths, and improves the stability, and outputs high-energy multi-wavelength pulses. The pulse width compression stable output module 5 is designed to use a multi-channel pulse compression structure of grating pairs and optical lenses to further perform pulse width compression and shift the central wavelength of the optical pulse. At the same time, by adjusting the polarization controller based on the few-mode fiber, the optical signal-to-noise ratio can be stabilized, making the output multi-wavelength pulse more stable.

Claims

1. A high-stability, high-power, multi-wavelength optical pulse generation system, comprising: The output end of the seed pulse source (1) is connected to the input end of the pulse width extension module (2), the output end of the pulse width extension module (2) is connected to the input end of the power amplifier module (3), the output end of the power amplifier module (3) is connected to the input end of the shaping optical path module (4), and the output end of the shaping optical path module (4) is connected to the input end of the pulse width compression stabilization output module (5); The structure of the seed pulse source module (1) is as follows: the first pump source (101) is connected to the 980nm end of the first wavelength division multiplexer (102); the common end of the first wavelength division multiplexer (102) is connected to the 45% input end of the first coupler (120) via the first erbium-doped fiber (103) and the first single-mode fiber (104); the 45% output end of the first coupler (120) is connected to the input and output end of the first collimator (105); the optical pulse is transmitted through the first collimator (105), the first polarizer (106), the first quarter-wave plate (107), the first half-wave plate (108), and the like. 108), the second quarter wave plate (109) is connected to the input end of the first polarization-dependent optical isolator (110), the output end of the first polarization-dependent optical isolator (110) is connected to the second polarizer (111), the third quarter wave plate (112), the second half wave plate (113), the fourth quarter wave plate (114), and the input end of the second collimator (115), the output end of the second collimator (115) is connected to the input end of the third polarizer (116), and the output end of the third polarizer (116) is connected to the input end of the first polarization controller (117) through a polarization-maintaining optical fiber The output end of the first polarization controller (117) is connected to the input end of the second polarization controller (118) through a polarization-maintaining optical fiber, the output end of the second polarization controller (118) is connected to the input end of the fourth polarizer (119) through a polarization-maintaining optical fiber, and the output end of the fourth polarizer (119) is connected to the common end of the wavelength division multiplexer (102); the 50% input end of the first coupler (120) is connected to the input end of the third collimator (121), and the optical pulse is transmitted through the third collimator (121), the fifth polarizer (122), the fifth quarter-wave plate (123), the third half-wave plate (124), The sixth quarter wave plate (125) is connected to the third port of the first optical circulator (126); the first port of the first optical circulator (126) is connected to the input end of the second coupler (135) via the second single-mode optical fiber (127); the output end of the second coupler (135) is connected to the input end of the fifth collimator (145); the output end of the fifth collimator (145) is connected to the first beam splitter (136); a portion of the light pulse of the first beam splitter (136) is transmitted to the first reflector (137); and the light reflected by the first reflector (137) is transmitted to the second beam splitter (138);Another part of the light pulses of the first beam splitter (138) is transmitted to the second reflector (138), the light pulses reflected by the second reflector (139) are transmitted to the second beam splitter (138), the light pulses transmitted by the second beam splitter (138) are transmitted to the input end of the sixth collimator (139), the output end of the sixth collimator (139) is connected to the output end of the third coupler (140), one output end of the third coupler (140) is connected to the input end of the third polarization controller (141), the output end of the third polarization controller (141) is connected to the input end of the fourth polarization controller (143) via the first high birefringence optical fiber (142), the output end of the fourth polarization controller (143) is connected to the output end of the third coupler (140) via the second high birefringence optical fiber (144). The optical pulse is connected to the input end of the fourth collimator (134) through the first port of the second optical circulator (129); the output end of the second coupler (135) of the first beam splitter (136) is connected to the third port of the second optical circulator (130); the second port of the first optical circulator (126) is connected to one end of the first polarization-maintaining optical fiber (128); the other end of the first polarization-maintaining optical fiber (128) is connected to the second port of the second optical circulator (129); the optical pulse passes through the first port of the second optical circulator (129), the seventh quarter-wave plate (130), the fourth half-wave plate (131), the eighth quarter-wave plate (132), the sixth polarizer (133), and is connected to the input end of the fourth collimator (134); the output end of the fourth collimator (134) is connected to the 50% output end of the first coupler (120); and finally, it is output from the 10% output port of the first coupler (120); The pulse width extension module (2) has the following optical path structure: the light pulse is transmitted to the fifth half-wave plate (204) and the first polarization beam splitter (203) through the output end of the seventh collimator (205); the light beam is transmitted to the ninth quarter-wave plate (202) and the first polarization beam splitter (203) through the chirped volume Bragg grating (201);The optical pulse transmitted through the first polarization beam splitter (203) is transmitted to the first convex lens (206), the optical pulse transmitted from the first convex lens (206) is transmitted to the input end of the first optical isolator (209) through the first photonic bandgap optical fiber (207) and the second convex lens (208), the optical pulse is transmitted from the output end of the first optical isolator (209) to the third convex lens (210), transmitted to the fourth convex lens (212) through the second erbium-doped optical fiber (211), the optical pulse is transmitted from the fourth convex lens (212) to the input end of the eighth collimator (213), the optical pulse output from the output end of the eighth collimator (213) is transmitted to the third reflector (214), and reflected by the third reflector (214). The emitted light pulse is transmitted to the fourth reflector (215), and is reflected by the fourth reflector (215) and then transmitted to the fifth reflector (216), and then reflected again and then transmitted to the sixth reflector (218), and then transmitted to the first grating (220) through the sixth reflector (218). The first grating (220) transmits the light pulse to the seventh reflector (221), and then reflects to the eighth reflector (222). The eighth reflector (222) reflects the light pulse back to the first grating (220). The pulse output by the first grating (220) is transmitted to the ninth reflector (224) through the fifth convex lens (223), and then reflected back to the first grating (220) through the fifth convex lens (223). The first grating (220) is transmitted to the seventh reflector (221), the light pulse reflected by the seventh reflector (221) is reflected by the eighth reflector (222) and then incident on the first grating (220), the light pulse output by the first grating (220) is incident on the Porro prism (225) and reflected back to the first grating (220) by the Porro prism (225), the light pulse passes through the first grating (220) and then passes through the seventh reflector (221), the eighth reflector (222), the first grating (220), the fifth convex lens (223), and the ninth reflector (224) according to the route described above, and returns to the first grating (220) after multiple reflections, and the light pulse is transmitted to the first grating (220) through the first grating (220). The optical pulse is input through the input end of the ninth collimator (227), transmitted to the tenth convex lens (228) through the output end of the ninth collimator (227), transmitted to the eleventh convex lens (230) and the twelfth convex lens (231) through the second photonic bandgap optical fiber (229), and then transmitted to the second chirped body Bragg grating (234) through the third erbium-doped optical fiber (232). The optical pulse is transmitted from the second chirped body Bragg grating (234) to the thirteenth reflector (235), and output after being reflected by the thirteenth reflector (235); The power amplification module (3) has the following optical path structure: the optical pulse is transmitted to the passive optical fiber (302) via the semiconductor saturable absorber (301), the fourth erbium-doped optical fiber (303) is connected to the input end of the first fiber Bragg grating (304), the output end of the first fiber Bragg grating (304) is connected to the common end of the second wavelength division multiplexer (305), the 980 nm end of the second wavelength division multiplexer (305) is connected to the second pump source (306), the other common end of the second wavelength division multiplexer (305) is connected to the input end of the second isolator (307), the output end of the second isolator (307) is connected to the input end of the tenth collimator (308), and the output end of the second isolator (307) is connected to the input end of the tenth collimator (308). The optical pulse is connected to the end of the optical filter (306), the optical pulse is transmitted to the fourteenth reflector (309) through the output end of the tenth collimator (308), reflected to the fifteenth reflector (310) and transmitted to the thirteenth convex lens (311), the optical pulse is incident on the fourteenth reflector (316) after passing through the thirteenth convex lens (311), the acousto-optic modulator (312), the fourteenth convex lens (313), the third isolator (314) and the sixth half-wave plate (315), the optical pulse is reflected by the fourteenth reflector (316) to the fifteenth reflector (317) and then incident on the fifteenth convex lens (318), the optical pulse is incident on the fifteenth convex lens (318), the eleventh collimator (319), the fourth The pump light generated by the first photodiode (327) is incident on the sixteenth reflector (323) after passing through the erbium-doped optical fiber (320), the twelfth collimator (321), and the sixteenth convex lens (322). The pump light generated by the first photodiode (327) is merged with the light pulse previously incident on the sixteenth reflector (323) after passing through the thirteenth collimator (326) and the seventeenth convex lens (325). The merged light pulse is reflected by the sixteenth reflector (323) to the seventeenth reflector (324). The seventeenth reflector (324) reflects the light pulse to the seventh half-wave plate (328). The light pulse passes through the seventh half-wave plate (328), the quarter-wave plate (329), and the band-pass filter (330). ), the eleventh quarter wave plate (331) is incident on the first grating (335), the light pulse is transmitted to the second grating (336) through the first grating (335), the second grating (336) transmits the light pulse to the eighteenth reflector (337), the eighteenth reflector (337) reflects the pulse back to the second grating (336), the light pulse is transmitted to the first grating (335) through the second grating (336), the light pulse output by the first grating (335) is transmitted to the nineteenth reflector (332), and is reflected by the nineteenth reflector (332) to the twelfth quarter wave plate (333), and finally output through the second polarization beam splitter (334); The shaping optical path module (4) has the following optical path structure: the optical pulse is transmitted to the eighth half-wave plate (401), and enters the first beam expander (403) after being reflected by the twentieth reflector (406) and the twenty-first reflector (402). After passing through the first beam expander (403), the optical pulse is reflected by the twenty-second reflector (404) to the first spatial light modulator (405). The light beam modulated by the first spatial light modulator (405) passes through the eighteenth convex lens (407) and the nineteenth convex lens (408). The optical pulse is focused by the lens (408) and the twentieth convex lens (409) and incident on the first feedback device (410). The optical pulse is transmitted from the first feedback device (410) to the fourteenth collimator (411), transmitted to the polarizer (412) through the output end of the fourteenth collimator (411), and incident on the twenty-third reflector (413). The optical pulse is reflected by the twenty-third reflector (413) to the spectrum shaping filter (414). The optical pulse output by the spectrum shaping filter (414) is reflected by the twenty-fourth reflector (41 5) After being reflected by the twenty-fifth reflector (416), the light pulse is reflected back to the spectrum shaping filter (414) again. The light pulse output from the spectrum shaping filter (414) is reflected by the twenty-sixth reflector (417) to the twenty-seventh reflector (418). The twenty-seventh reflector (418) reflects the light pulse to the first spectrum shaping grating (419). The first spectrum shaping grating (419) reflects the light pulse to the twenty-eighth reflector (422) and then to the first spectrum shaping concave mirror (423). ), after the light pulse passes through the first spectrum shaping concave mirror (423) and the second spatial light modulator (424), it is transmitted to the second spectrum shaping concave mirror (425), the second spectrum shaping concave mirror (425) reflects the light pulse to the twenty-ninth reflecting mirror (426), the light pulse is then reflected by the twenty-ninth reflecting mirror (426) to the second spectrum shaping grating (420) and then reflected to the thirtieth reflecting mirror (421), the output of the thirtieth reflecting mirror (421) is the output of the spectrum shaping module (4); The pulse width compression stable output module (5) has the following optical path structure: a light pulse passes through a third polarization beam splitter (501) and is incident on a fourth polarization beam splitter (502); a portion of the light pulse passing through the fourth polarization beam splitter (502) is transmitted to a thirty-first reflector (503); the light pulse is reflected by the thirty-first reflector (503) and then sequentially reflected by a thirty-second reflector (504), a thirty-third reflector (505), and a thirty-fourth reflector (506); the light pulse reflected by the thirty-fourth reflector (506) is incident on a third grating (512); the third grating (512) reflects the light pulse to a fourth grating (513); and the fourth grating (513) reflects the light pulse to a thirty-fifth reflector (514). After the light pulse reaches the thirty-fifth reflector (514), it is reflected back to the third grating (512) according to the input route. The third grating (512) transmits the light pulse to the thirty-sixth reflector (515). The light pulse is reflected by the thirty-sixth reflector (515) to the thirty-seventh reflector (517). The light pulse is incident on the twenty-first convex lens (534) through the thirty-seventh reflector (517). Another part of the light pulse output from the fourth polarization beam splitter (502) is transmitted to the thirty-eighth reflector (507). After the light pulse is reflected by the fourth polarization beam splitter (502), it passes through the thirty-ninth reflector (508), the fortieth reflector (509), the forty-first reflector (510), and the forty-second reflector (511) in sequence. The light pulse reflected by the second reflector (511) and the light pulse reflected by the thirty-fourth reflector (506) enter the third grating (512) in parallel. According to the incident route of the light pulse incident from the thirty-fourth reflector (506) to the third grating (512) described above, it passes through the third grating (512), the fourth grating (513), and the thirty-fifth reflector (514) in sequence and returns to the third grating (512) along the input route. The light pulse is transmitted from the third grating (512) to the thirty-sixth reflector (515). The light pulse is reflected from the thirty-sixth reflector (515) to the forty-third reflector (516). The light pulse is incident on the twenty-first convex lens (534) through the forty-third reflector (516). The light pulse is transmitted from the third polarization beam splitter (5 01) and the other output end is transmitted to a forty-fourth reflector (518), and then transmitted to a fifth polarization beam splitter (519) via the forty-fourth reflector (518). Part of the light pulse passing through the fifth polarization beam splitter (519) is transmitted to a forty-fifth reflector (520). After being reflected by the forty-fifth reflector (520), the light pulse is sequentially reflected by a forty-sixth reflector (521), a forty-seventh reflector (522), and a forty-eighth reflector (523). The light pulse reflected by the forty-eighth reflector (523) is incident on a fifth grating (529). The fifth grating (529) reflects the light pulse to a sixth grating (530). The sixth grating (530) reflects the light pulse to a forty-ninth reflector (531).After the light pulse reaches the forty-ninth reflector (531), it is reflected back to the fifth grating (529) according to the input route. The fifth grating (529) transmits the light pulse to the fiftieth reflector (598). The light pulse is reflected by the fiftieth reflector (598) to the fifty-first reflector (533). The light pulse is incident on the twenty-first convex lens (534) through the fifty-first reflector (533). Another part of the light pulse output from the fifth polarization beam splitter (519) is transmitted to the fifty-second reflector (524). After the light pulse is reflected by the fifty-second reflector (524), it passes through the fifty-third reflector (525), the fifty-fourth reflector (526), ​​the fifty-fifth reflector (527), and the fifty-sixth reflector (528) in sequence. The light pulse reflected by the reflecting mirror (528) and the light pulse reflected by the forty-eight reflecting mirror (523) enter the fifth grating (529) in parallel, and pass through the sixth grating (530) and the forty-ninth reflecting mirror (531) in sequence and return to the fifth grating (529) along the input route. The light pulse is transmitted from the fifth grating (529) to the fiftieth reflecting mirror (598). The light pulse is reflected by the fiftieth reflecting mirror (598) to the fifty-seventh reflecting mirror (532), and is incident on the twenty-first convex lens (534) through the fifty-seventh reflecting mirror (532). The four light pulses respectively pass through the forty-third reflecting mirror (516), the thirty-seventh reflecting mirror (517), the fifty-seventh reflecting mirror (532), and the fifty-first reflecting mirror (533) and enter in parallel. The light pulses are focused by the twenty-first convex lens (534) and then merged. The merged light pulses are reflected by the fifty-eighth reflector (535) to the fifty-ninth reflector (536), and then reflected by the fifty-ninth reflector (536) to the sixtieth reflector (537) and the sixtieth reflector (538). After the sixtieth reflector (538), the light pulses are transmitted to the ninth half-wave plate (539). After the sixty-second reflector (540) and the sixty-third reflector (558), the light pulses enter the second beam expander (557). After the second beam expander (557), the light pulses are reflected by the sixty-fourth reflector (556) to the third spatial light modulator (541). After the third spatial light modulator (541), the light pulses are transmitted to the ninth half-wave plate (539). After the sixty-second reflector (540) and the sixty-third reflector (558), the light pulses enter the second beam expander (557). After the sixty-fourth reflector (556) passes through the second beam expander (557), the light pulses are reflected by the sixty-fourth reflector (556) to the third spatial light modulator (541). The modulated light beam (541) is focused by the twenty-second convex lens (542), the twenty-third convex lens (543), and the twenty-fourth convex lens (544) and incident on the second feedback device (545). The light pulse is transmitted from the second feedback device (545) to the fifteenth collimator (546), and then transmitted to the sixty-fifth reflector (547) and the sixty-sixth reflector (548) via the fifteenth collimator (546). The light pulse is reflected by the sixty-sixth reflector (548) to the tenth half-wave plate (549), and then incident on the sixth polarization beam splitter (550) via the tenth half-wave plate (549). The light pulse output from the output end of the sixth polarization beam splitter (550) parallel to the incident direction is transmitted to the sixty-seventh reflector (551).The light pulse is reflected by the sixty-seventh reflector (551) to the sixty-eighth reflector (552), reflected by the sixty-eighth reflector (552) to the sixty-ninth reflector (553), reflected by the seventyth reflector (554), the light pulse reflected by the seventyth reflector (554) is incident on the twenty-fifth convex lens (555), the light pulse is incident on the seventy-first reflector (559) through the twenty-fifth convex lens (555), the light pulse output by the seventy-first reflector (559) is transmitted to the seventy-second reflector (561) through the tenth half-wave plate (560), the light pulse is reflected by the seventy-second reflector (561) to the third spectrum shaping concave mirror (565), and then is incident on the fourth spectrum shaping concave mirror (565) through the BBO crystal (564). The light pulse is incident on a concave mirror (563), and is reflected by a third spectrum shaping concave mirror (565) to a seventy-third reflecting mirror (569). The light pulse output perpendicular to the incident direction by the sixth polarization beam splitter (550) is reflected by a seventy-fourth reflecting mirror (570) and then merged with the light pulse reflected by the seventy-third reflecting mirror (569). The merged light pulse is incident on a seventh polarization beam splitter (571). The light pulse output by the seventh polarization beam splitter (571) is incident on a fifth spectrum shaping concave mirror (572). The light pulse is incident on a sixth shaping concave mirror (574) through a MgO:PPLN crystal (573) via the fifth spectrum shaping concave mirror (572). The light pulse is reflected by the sixth shaping concave mirror (574) to a seventy-fifth reflecting mirror (554). The light pulse is incident on the fourth spectrum shaping concave mirror (563) through the seventy-fifth reflecting mirror (562). After being transmitted to the fourth spectrum shaping concave mirror (563), the light pulse passes through the fourth spectrum shaping concave mirror (563), the BBO crystal (564), the third spectrum shaping concave mirror (565), the seventy-third reflecting mirror (569), the seventh polarization beam splitter (571), the fifth spectrum shaping concave mirror (572), the MgO:PPLN crystal (573), the sixth spectrum shaping concave mirror (574), and the seventy-fifth reflecting mirror (562). After multiple reflections, the light pulse returns to the third spectrum shaping concave mirror (565). The light pulse is transmitted through the third spectrum shaping concave mirror (565) and output and is transmitted to the twenty-sixth convex lens (566), the light pulse output by the twenty-sixth convex lens (566) is transmitted to the sixteenth collimator (575) through the seventy-sixth reflector (567) and the seventy-seventh reflector (568), and is transmitted to the fourth coupler (576) through the sixteenth collimator (575), the light pulse transmitted by the fourth coupler (576) is connected to the third wavelength division multiplexer (577), the other end of the third wavelength division multiplexer (577) is connected to the fourth isolator (579) through the fifth erbium-doped optical fiber (578), the light pulse is connected to the seventeenth collimator (580) through the fourth isolator (579), the light pulse transmitted from the seventeenth collimator (580) is reflected by the seventy-eighth reflector (581) and is connected to the eighteenth collimator (582),The light pulse transmitted from the eighteenth collimator (582) is connected to the nineteenth collimator (585) via the first few-mode polarization controller (583) and the second few-mode polarization controller (584). The light pulse transmitted through the nineteenth collimator (585) is reflected by the seventy-ninth reflector (586) and then transmitted to the twentieth collimator (587). The light pulse is transmitted to the input end of the seventh polarizer (588) via the twentieth collimator (587). The output end of the seventh polarizer (588) is connected to the third few-mode polarization controller (589). The light pulse is transmitted to the high nonlinear optical fiber (590) via the third few-mode polarization controller (589). The light pulse transmitted through the high nonlinear optical fiber (590) is incident After reaching the twenty-first collimator (591), the optical pulse is reflected by the eightieth reflector (592). The optical pulse reflected by the eightieth reflector (592) is transmitted to the fifth coupler (594) through the twenty-second collimator (593). The optical pulse is transmitted to the twenty-third collimator (595) through the fifth coupler (594). The optical pulse is transmitted to the eighty-first reflector through the twenty-third collimator (595). The reflected optical pulse is transmitted to the twenty-fourth collimator (597). The output end of the twenty-fourth collimator (597) is connected to the common end of the third wavelength division multiplexer (577). The output end of the fifth coupler (594) is the output of the pulse compression stable output module (5), which is used to finally output the optical pulse.

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