Two-stage light source structure

Abstract

The utility model relates to a two-stage light source structure. The two-stage light source structure comprises an input end integrator and an output end integrator, the input end integrator is connected with the output end integrator through the isolator; the input end of the input end integrator is connected with a seed source, and the output end is connected with a first active optical fiber; the other end of the first active optical fiber is connected with an isolator; the first active optical fiber is connected with a first pump light source; the output end integrator is connected with the isolator through a second active optical fiber; and the second active optical fiber is connected with a second pump light source. According to the utility model, the integration of the whole structure is realized, and the size is smaller; the input end integrator realizes the functions of isolation, wave combination, light splitting and detection, and the light source structure is simplified; the connection position of the pump light source is more free, more selectivity is achieved, meanwhile, redundant design of the pump light can be achieved, and stability is improved.

Description

Technical Field

[0001] The utility model relates to the field of laser light sources, in particular to a double-stage light source structure. Background Art

[0002] LiDAR is one of the essential core sensors in the multi-sensor system of future intelligent assisted driving, drones, and driverless cars. With the rapid development of the driverless market, more and more companies are joining in the development of new applications for LiDAR and the pursuit of advanced technology. As the price of LiDAR will drop significantly due to the maturity of technology, more and more models will be equipped with LiDAR.

[0003] As the current laser radar technology matures, in order to improve detection accuracy and detection distance, the requirements for narrow pulses and high peak optical power indicators of laser light sources are also increasing. Laser light source is one of the core components of automotive laser radar. The ideal light source for automotive laser radar is high eye safety, high power, short pulse, high beam quality, high reliability, low price, small size, and longer detection distance.

[0004] refer to Figure 1 In an existing on-vehicle laser radar light source, the seed light source emits a 1550nm band signal light which is input from the input end of the high-power isolator. The output end of the high-power isolator is a dual-fiber wavelength division multiplexing. The pump light source (980nm) is combined with 1550nm through wavelength division multiplexing at the output end of the high-power isolator. The seed light source and the pump light source are coupled together and enter the erbium-doped fiber together. The optical signal amplified by the erbium-doped fiber passes through the detector, and a part is separated to realize real-time monitoring of the working status of the amplifier. The remaining amplified optical signal is output through the high-power isolator. Two high-power isolators are required in this light source structure, one of which has a wavelength division multiplexing function to realize the multiplexing of the seed light source and the pump light source, and the other is used at the output end; the erbium-doped fiber is only used once, requires a longer length, and is expensive. Due to the large number of optical devices, the erbium-doped fiber is longer, and the isolator can only output the fiber from the left and right ports. Therefore, the light source module needs to have enough space for the device placement and fiber winding when it is in the box, which makes the entire light source module relatively large. In the light source structure that requires double-stage amplification, other structures need to be added, which will further increase the volume of the product. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In order to solve the above problems in the prior art, the utility model provides a double-stage light source structure.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0009] A double-stage light source structure, characterized in that: it includes an input end integrator and an output end integrator; the input end integrator is connected to the output end integrator through an isolator; the input end of the input end integrator is connected to a seed source, and the output end is connected to a first active optical fiber; the other end of the first active optical fiber is connected to an isolator; the first active optical fiber is connected to a first pump light source; the output end integrator is connected to the isolator through a second active optical fiber; the second active optical fiber is connected to a second pump light source.

[0010] Furthermore, the input end integrator includes three optical fiber heads, a birefringent crystal, a wave plate, a lens, a lens wave combining film layer, a magneto-optical material, a magnetic ring, a partial reflector, and a first photodiode, which are sequentially arranged along the optical path direction.

[0011] Furthermore, the first optical fiber of the three-fiber head is used to input the first signal light generated by the seed source, the second optical fiber is used to input the first pump light generated by the first pump light source, and the third optical fiber is used to output the light integrated by the input end integrator into the isolator.

[0012] Furthermore, the isolator is connected to another first pump light source and the pump light generated by the pump light is input into the first active optical fiber.

[0013] Furthermore, the output end integrator includes three optical fiber heads arranged along the optical path, a birefringent crystal, a wave plate, a lens, a pump light reflector, a rotating crystal, a partial reflector, and a second photodiode.

[0014] Furthermore, the fourth optical fiber of the three-fiber head two is used to input the second pump light generated by the second pump light source; the fifth optical fiber is used to input the signal light output by the isolator; and the sixth optical fiber is used to output the amplified second signal light.

[0015] Furthermore, the isolator is connected to another second pump light source and the pump light generated by the second pump light source is input into the second active optical fiber.

[0016] Furthermore, the first photodiode is used to monitor the first signal light.

[0017] Furthermore, the second photodiode is used to monitor the second signal light.

[0018] Furthermore, the isolator includes an optical fiber head, a lens, a partial reflective film, an isolator core, a partial reflective film, a lens, and an optical fiber head which are sequentially arranged along the optical path direction.

[0019] (III) Beneficial effects

[0020] The beneficial effects of the utility model are: the overall structure is integrated and the volume is smaller; the input end integrator realizes the functions of isolation, wave combining, light splitting and detection, and simplifies the light source structure; the connection position of the pump light source is more free and has more selectivity, and at the same time, the redundant design of the pump light can be realized to improve the stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the optical path structure of an existing vehicle-mounted laser radar light source;

[0023] Figure 2 It is a schematic diagram of the optical structure of the light source of an embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the optical structure of a light source in another embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the optical path structure of the input end integrator of the utility model;

[0026] Figure 5 This is a schematic diagram of the optical path structure of the output end integrator of the utility model;

[0027] Figure 6 This is a schematic diagram of the optical path structure of the isolator of the utility model;

[0028] Figure 7 It is a schematic diagram of the optical path structure of an isolator in another embodiment of the utility model;

[0029] Explanation of the reference numerals: 10, seed source; 100, first signal light; 20, first pump light source; 21, second pump light source; 200, first pump light; 201, second pump light; 30, input end integrator; 301, three-fiber head one; 302, birefringent crystal; 303, wave plate; 304, lens; 305, lens wave combining film layer; 306, magneto-optical material; 307, partial reflection film; 308, magnetic ring; 40, first active optical fiber; 50, output end integrator; 500, second signal light; 501, three-fiber head two; 502, birefringent crystal; 503, wave plate; 504, lens; 505, pump light reflection plate; 506, rotating crystal; 507, partial reflection film; 61, first photodiode; 62, second photodiode; 70, isolator; 71, seventh optical fiber; 72, eighth optical fiber; 73, ninth optical fiber; 74, tenth optical fiber; 701, single optical fiber head; 702, lens; 703, partial reflection film; 704, isolator core; 705, partial reflection film; 706, lens; 707, single optical fiber head; 708, dual optical fiber head; 709, dual optical fiber head; 80, second active optical fiber; 91, first optical fiber; 92, second optical fiber; 93, third optical fiber; 94, fourth optical fiber; 95, fifth optical fiber; 96, sixth optical fiber. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example:

[0034] like Figure 2 As shown, a double-stage light source structure includes a seed source 10 and a first pump light source 20; the seed source 10 and the first pump light source 20 are connected to the input port of the input end integrator 30; the input end integrator 30 is connected to the output end integrator 50 through an isolator 70; the output port of the input end integrator 30 is connected to the isolator 70 through a first active optical fiber 40; the isolator 70 is connected to the output end integrator 50 through a second active optical fiber 80; the first active optical fiber 40 is connected to the first pump light source 20; the second active optical fiber 80 is connected to the second pump light source 21;

[0035] The seed source 10 generates a first signal light 100; the first pump light source 20 provides energy to the first active optical fiber 40; the first active optical fiber 40 absorbs the first pump light 200 of the first pump light source 20, and amplifies the first signal light 100 generated by the seed source 10;

[0036] like Figure 4As shown, in one embodiment of the utility model, the input end integrator 30 includes three optical fiber heads 301, a birefringent crystal 302, a wave plate 303, a lens 304, a lens wave combining film layer 305, a magneto-optical material 306, a magnetic ring 308, a partial reflective film 307, and a first photodiode 61, which are sequentially arranged along the optical path direction; the first optical fiber 91 of the three optical fiber heads 301 is used to input the first signal light 100 generated by the seed source 10, the second optical fiber 92 is used to input the first pump light 200 generated by the first pump light source 20, and the third optical fiber 93 is used to output the light integrated by the input end integrator 30 into the isolator 70, that is, the third optical fiber 93 is connected to the first active optical fiber 40; the first photodiode 61 is used to detect and monitor the first signal light 100;

[0037] The birefringent crystal 302, wave plate 303, lens 304, lens wave combining film layer 305, magneto-optical material 306, magnetic ring 308, and partial reflective film 307 realize an isolation function, isolating the seed light source 10 from the first active optical fiber 40, and the isolator 70 can isolate the first pump light 200 to prevent it from being transmitted to the second active optical fiber 80, and isolate the first pump light 200 in the first active optical fiber 40;

[0038] The first optical fiber 91, the second optical fiber 92, the third optical fiber 93 and the lens 304 of the three-fiber head 301 constitute an input end combiner of pump light and signal light;

[0039] The first optical fiber 91, the third optical fiber 93, the lens 304 and the partial reflection film 307 of the three-fiber head 301 constitute an input end optical splitter;

[0040] The first optical fiber 91, the lens 304, the partial reflection film 307 and the first photodiode 61 of the three-fiber head 301 constitute an input end detector.

[0041] like Figure 5As shown, in one embodiment of the utility model, the output end integrator 50 includes three optical fiber heads 501, birefringent crystals 502, wave plates 503, lenses 504, pump light reflectors 505, rotating crystals 506, partial reflective films 507, and second photodiodes 62, which are sequentially arranged along the optical path direction; the fourth optical fiber 94 of the three optical fiber heads 501 is used to input the second pump light 201 generated by the second pump light source 21, the fifth optical fiber 95 is used to input the signal light output by the isolator 70, that is, the fifth optical fiber 95 is connected to the second active optical fiber 80, and the sixth optical fiber 96 is used to output the amplified second signal light 500 for output; the birefringent crystal 502, wave plates 503, lenses 504, pump light reflectors 505, rotating crystals 506, and partial reflective films 507 realize the isolation function, and cooperate with the isolator 70 to isolate the second pump light 201 in the second active optical fiber 80; the second photodiode 62 is used to detect and monitor the second signal light 500;

[0042] like Figure 3 As shown, in one embodiment of the utility model, the isolator 70 is connected to another first pump light source 20 and the pump light generated by the isolator 70 is input into the first active optical fiber 40; in this connection structure, the redundant design of the pump light source can be realized to avoid the failure of the pump light source, realize the mutual backup of the pump light sources on the first active optical fiber 40 side, and improve the stability; on the other hand, the two pump light sources can also be used to further amplify the first signal light 100.

[0043] The isolator 70 is connected to another second pump light source 21 and the pump light generated by the same is input into the second active optical fiber 80. In this connection structure, a redundant design of the pump light source can be realized to avoid failure of the pump light source, realize mutual backup of the pump light sources on the second active optical fiber 80 side, and improve stability. On the other hand, the two pump light sources can also be used to further amplify the second signal light 500.

[0044] like Figure 6 As shown, in one embodiment of the utility model, the optical fiber head is a single optical fiber head, and the isolator 70 includes a single optical fiber head 701, a lens 702, a partial reflective film 703, an isolator core 704, a partial reflective film 705, a lens 706, and a single optical fiber head 707, which are sequentially arranged along the optical path direction; the single optical fiber head 701 includes a seventh optical fiber 71, which is connected to the first active optical fiber 40 and is used to receive the light integrated by the input end integrator 30; the reflection bandwidth of the partial reflective film 703 and the partial reflective film 705 is 900-1000nm, and the transmission bandwidth is 1000-1650nm. The first signal light 100 is 1550nm and can be transmitted through the partial reflective film 703 and the partial reflective film 705, and is output from the eighth optical fiber 72 on the single optical fiber head 707, and then enters the second active optical fiber 80;

[0045] The second pump light 201 in the second active optical fiber 80 is 980 nm, enters the isolator 70 through the eighth optical fiber 72, is reflected by the partial reflection film 705 and re-enters the second active optical fiber 80, thereby isolating the second pump light 201 in the second active optical fiber 80;

[0046] like Figure 7 As shown, in one embodiment of the utility model, the optical fiber head is a dual optical fiber head, and the isolator 70 includes a dual optical fiber head 708, a lens 702, a partial reflection film 703, an isolator core 704, a partial reflection film 705, a lens 706, and a dual optical fiber head 709 arranged in sequence along the optical path direction; the dual optical fiber head 708 includes a seventh optical fiber 71 and a ninth optical fiber 73; the seventh optical fiber 71 is connected to the first active optical fiber 40, and is used to receive the light integrated by the input end integrator 30; the ninth optical fiber 73 is used to be connected to the first pump light source 20, and the first pump light 200 generated by the first pump light source 20 is 980nm, which is connected to the isolator 70 through the ninth optical fiber 73, and enters the seventh optical fiber 71 after being reflected by the partial reflection film 703, and finally enters the first active optical fiber 40 to amplify the first signal light 100 generated by the seed source 10;

[0047] The dual-fiber head 709 includes an eighth optical fiber 72 and a tenth optical fiber 74; the eighth optical fiber 72 is connected to the second active optical fiber 80, and is used to transmit the first signal light amplified in the first stage into the second active optical fiber 80, and the tenth optical fiber 74 is used to be connected to the second pump light source 21. The second pump light 201 generated by the second pump light source is 980nm, which is connected to the isolator 70 through the tenth optical fiber 74, is reflected by the partial reflection film 705 and enters the eighth optical fiber 72, and finally enters the second active optical fiber 80 for secondary amplification of the signal light.

[0048] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A dual-stage light source structure, characterized in that: The invention comprises an input-end integrator (30) and an output-end integrator (50); the input-end integrator (30) is connected to the output-end integrator (50) via an isolator (70); the input end of the input-end integrator (30) is connected to a seed source (10), and the output end is connected to a first active optical fiber (40); the other end of the first active optical fiber (40) is connected to the isolator (70); the first active optical fiber (40) is connected to a first pump light source (20); the output-end integrator (50) is connected to the isolator (70) via a second active optical fiber (80); and the second active optical fiber (80) is connected to a second pump light source (21).

2. A dual-stage light source structure according to claim 1, characterized in that: The input end integrator (30) comprises three optical fiber heads (301), a birefringent crystal, a wave plate, a lens, a lens wave combining film layer, a magneto-optical material, a magnetic ring, a partial reflector, and a first photodiode (61) which are sequentially arranged along the optical path direction.

3. A dual-stage light source structure according to claim 2, characterized in that: The first optical fiber (91) of the three-fiber head (301) is used to input the first signal light (100) generated by the seed source (10), the second optical fiber (92) is used to input the first pump light (200) generated by the first pump light source (20), and the third optical fiber (93) is used to output the light integrated by the input end integrator (30) into the isolator (70).

4. The double-stage light source structure according to claim 1, characterized in that: The isolator (70) is connected to another first pump light source (20) and inputs the pump light generated by the pump light into the first active optical fiber (40).

5. The double-stage light source structure according to claim 1, characterized in that: The output end integrator (50) comprises three optical fiber heads (501) arranged along the optical path, a birefringent crystal, a wave plate, a lens, a pump light reflector, a rotating crystal, a partial reflector, and a second photodiode (62).

6. A dual-stage light source structure according to claim 5, characterized in that: The fourth optical fiber (94) of the third optical fiber head (501) is used to input the second pump light (201) generated by the second pump light source (21); the fifth optical fiber (95) is used to input the signal light output by the isolator (70); and the sixth optical fiber (96) is used to output the amplified second signal light (500).

7. The double-stage light source structure according to claim 1, characterized in that: The isolator (70) is connected to another second pump light source (21) and the pump light generated by the second pump light source is input into the second active optical fiber (80).

8. A dual-stage light source structure according to claim 2, characterized in that: The first photodiode (61) is used to monitor the first signal light (100).

9. The double-stage light source structure according to claim 5, characterized in that: The second photodiode (62) is used to monitor the second signal light (500).

10. The double-stage light source structure according to claim 1, characterized in that: The isolator (70) comprises an optical fiber head, a lens, a partial reflection film, an isolator core, a partial reflection film, a lens, and an optical fiber head, which are sequentially arranged along the optical path direction.

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