CN212935134U - Tunable laser with short cavity length - Google Patents
Tunable laser with short cavity length Download PDFInfo
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- CN212935134U CN212935134U CN202022271966.2U CN202022271966U CN212935134U CN 212935134 U CN212935134 U CN 212935134U CN 202022271966 U CN202022271966 U CN 202022271966U CN 212935134 U CN212935134 U CN 212935134U
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Abstract
The utility model provides a tunable laser of short chamber length, including tunable optical filter, semiconductor optical amplification device, first position sleeve and second position sleeve, tunable optical filter is provided with first input lock pin and first output lock pin, semiconductor optical amplification device is provided with second input lock pin, second output lock pin and target output end, first input lock pin and second output lock pin insert to first position sleeve intraductally, the tip of first input lock pin is relative with the tip of second output lock pin, first position sleeve intussuseption is filled with refractive index matching liquid, second input lock pin and first output lock pin insert to second position sleeve intraductally, the tip of second input lock pin is relative with the tip of first output lock pin, second position sleeve intussuseption is filled with refractive index matching liquid. The connecting scheme of the inserting core and the positioning sleeve is adopted to effectively shorten the cavity length, realize higher scanning frequency and facilitate the replacement and debugging of equipment.
Description
Technical Field
The utility model relates to an optical device field especially relates to a tunable laser of short chamber length.
Background
A single-frequency tunable laser and a high-speed wavelength swept-frequency laser are widely used in various fields, such as Optical Coherence Tomography (OCT), biochemical spectroscopy, optical fiber sensing applications, and optical communications, and in order to realize wide commercial applications, building an annular cavity based on a filter and a semiconductor optical amplifier is an important way to realize swept-frequency laser.
In the middle of the practical use, build each device of annular chamber, including semiconductor optical amplifier, optical isolator, coupler and optical filter etc. generally adopt the mode of optical fiber fusion to connect, so hardly make shorter annular chamber. The shorter the cavity length of the short annular cavity is, the higher the scanning frequency which can be supported by the short annular cavity is, so that the establishment of the sufficiently short annular cavity is an important precondition for preparing the high-speed frequency-sweeping laser.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an utilize the tunable laser of short chamber length realization higher scanning frequency.
In order to realize the utility model discloses the purpose, the utility model provides a tunable laser of short chamber length, include:
the tunable optical filter is provided with a first input inserting core and a first output inserting core;
the semiconductor optical amplifying device is provided with a second input inserting core, a second output inserting core and a target output end;
the first positioning sleeve is internally filled with refractive index matching fluid, and the first input ferrule and the second output ferrule are inserted into the first positioning sleeve;
and the second positioning sleeve is internally filled with refractive index matching fluid, and the end part of the second input ferrule is opposite to the end part of the first output ferrule.
The first positioning sleeve is a C-shaped ceramic sleeve or a V-shaped ceramic sleeve, and the second positioning sleeve is a C-shaped ceramic sleeve or a V-shaped ceramic sleeve.
In a further scheme, the tunable optical filter is a fiber Fabry-Perot filter.
In order to realize the utility model discloses the purpose, the utility model discloses still can provide a tunable laser of short chamber length, include:
the tunable optical filter is provided with a first input inserting core and a first output inserting core;
the semiconductor optical amplifying device is provided with a second input inserting core and a second output inserting core;
the first isolator is provided with a third input inserting core, a third output inserting core and a target output end;
the first positioning sleeve is internally filled with refractive index matching fluid, and the first input ferrule and the second output ferrule are inserted into the first positioning sleeve;
the third input ferrule and the first output ferrule are inserted into the second positioning sleeve, the end part of the third input ferrule is opposite to the end part of the first output ferrule, and the second positioning sleeve is filled with refractive index matching fluid;
and the second input ferrule and the third output ferrule are inserted into the third positioning sleeve, the end part of the second input ferrule is opposite to the end part of the third output ferrule, and the third positioning sleeve is internally filled with refractive index matching fluid.
The first positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve; the second positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve; the third positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve.
In a further scheme, the tunable optical filter is a fiber Fabry-Perot filter.
In order to realize the utility model discloses the purpose, the utility model discloses still can provide a tunable laser of short chamber length, include:
the tunable optical filter is provided with a first input inserting core and a first output inserting core;
the semiconductor optical amplifying device is provided with a second input inserting core and a second output inserting core;
the first isolator is provided with a third input inserting core, a third output inserting core and a target output end;
the second isolator is provided with a fourth input inserting core and a fourth output inserting core;
the first positioning sleeve is internally filled with refractive index matching fluid, and the end part of the first input insertion core is opposite to the end part of the fourth output insertion core;
the third input ferrule and the first output ferrule are inserted into the second positioning sleeve, the end part of the third input ferrule is opposite to the end part of the first output ferrule, and the second positioning sleeve is filled with refractive index matching fluid;
the second input ferrule and the third output ferrule are inserted into the third positioning sleeve, the end part of the second input ferrule is opposite to the end part of the third output ferrule, and the third positioning sleeve is filled with refractive index matching fluid;
and the fourth input ferrule and the second output ferrule are inserted into the fourth positioning sleeve, the end part of the fourth input ferrule is opposite to the end part of the second output ferrule, and the fourth positioning sleeve is internally filled with refractive index matching fluid.
The first positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve; the second positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve; the third positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve; the fourth positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve.
In a further scheme, the tunable optical filter is a fiber Fabry-Perot filter.
In a further aspect, the first isolator is an isolator with a reflective output, and the target output is located at the reflective output.
The beneficial effects of the utility model are that, based on current welding technique, adopt optical fiber splicer and optic fibre clamp to weld in view of needs, hardly shorten the chamber length of annular chamber. The scheme does not adopt fusion splicing as the coupling connection of optical fibers, the connection of each device of the tunable laser adopts the butt joint of two insertion cores to realize the coupling of optical signals, and during the connection, the two insertion cores are inserted into the positioning sleeve and matched with the refractive index matching fluid filled in the positioning sleeve, so that the optical coupling efficiency is improved, because the manufacture of the ferrule is simpler, generally, after the optical fiber with the coating layer removed is cut according to a proper length, the ceramic ferrule is arranged, and finally, the proper polishing is carried out, so that the length of the optical fiber is controllable, the assembly and the production are convenient, the length of the connected optical fiber can be effectively controlled or locked, the effective shortening of the cavity length and the higher scanning frequency are realized, in addition, the connecting scheme of the inserting core and the positioning sleeve is adopted, so that the device is convenient to test, replace and change schemes, the inserting core can be reused for multiple times, the cost is low, and the operation is simple and convenient.
Drawings
Fig. 1 is a block diagram of a first embodiment of the tunable laser of the present invention.
Fig. 2 is a structural diagram of the ferrule and the position sleeve in the first embodiment of the tunable laser according to the present invention.
Fig. 3 is a cross-sectional view of the ferrule and the position sleeve in the first embodiment of the tunable laser of the present invention.
Fig. 4 is a block diagram of a second embodiment of the tunable laser of the present invention.
Fig. 5 is a block diagram of a third embodiment of the tunable laser of the present invention.
Fig. 6 is a block diagram of a fourth embodiment of the tunable laser of the present invention.
The present invention will be further explained with reference to the drawings and examples.
Detailed Description
Tunable laser first embodiment:
referring to fig. 1 to 3, the tunable laser includes a tunable optical filter 11, a semiconductor optical amplifying device 12, a first isolator 13, a second isolator 14, a first positioning sleeve 21, a second positioning sleeve 22, a third positioning sleeve 23, and a fourth positioning sleeve 24. The tunable optical filter 11 is an optical fiber Fabry-Perot filter, the tunable optical filter 11 comprises piezoelectric ceramics 15, an optical fiber ferrule 112 and an optical fiber ferrule 113, the end parts of the optical fiber ferrule 112 and the optical fiber ferrule 113 are arranged oppositely, specific structures and working principles can refer to the structure disclosed by CN109557617A named as a tunable filter, fine and quick adjustment of the distance between the optical fiber ferrules can be realized through the power-on drive of the piezoelectric ceramics 15, the filter can be adjusted in a large adjustable range by utilizing the accurate or quick distance adjustment, and quick frequency sweeping can also be realized.
The tunable optical filter 11 is provided with a first input ferrule 31 and a first output ferrule 32, the optical fiber ferrule 113 is connected with the first input ferrule 31 through an optical fiber 311, and the first output ferrule 32 is connected with the first output ferrule 32 through an optical fiber 321. The input ferrule or the output ferrule has the same structure, taking the first input ferrule 31 as an example, the first input ferrule 31 includes a ferrule 313, a handle 312 and an optical fiber 311, a capillary hole is axially arranged in the ferrule 313, the optical fiber 311 extends into the capillary hole, and the handle 312 is located on the periphery of the optical fiber 311.
The semiconductor optical amplifying device 12 is abbreviated as SOA, the semiconductor optical amplifying device 12 is provided with a second input ferrule 33 and a second output ferrule 34, the second input ferrule 33 is connected with the semiconductor optical amplifying device 12 through an optical fiber 331, and the second output ferrule 34 is connected with the semiconductor optical amplifying device 12 through an optical fiber 341.
The first Isolator 13 is an Isolator with a reflective output end, for example, a Polarization sensitive Tap Isolator manufactured by limited public corporation of zhuchai optical library science and technology, which is a well-known conventionally used device, and the first Isolator 13 is provided with a third input ferrule 35, a third output ferrule 36 and a target output end 131, which is located at the reflective output end. The third input ferrule 35 and the third output ferrule 36 are connected to the first isolator 13 through optical fibers, respectively.
The second isolator 14 is provided with a fourth input ferrule 37 and a fourth output ferrule 38, the fourth input ferrule 37 and the fourth output ferrule 38 are respectively connected with the second isolator 14 through optical fibers, the first isolator 13 and the second isolator 14 are optical isolators, one-way light passing reverse blocking can be achieved, a transflective mirror or a transflective film with a preset proportion is arranged in the first isolator 13, light with a certain proportion can be reflected to a target output end 131, and then target light is output.
The first positioning sleeve 21, the second positioning sleeve 22, the third positioning sleeve 23, and the fourth positioning sleeve 24 are all C-shaped ceramic sleeves, and taking the first positioning sleeve 21 as an example, the first positioning sleeve 21 is provided with a through hole penetrating in the axial direction, and the peripheral wall of the first positioning sleeve 21 is provided with a groove 211. The positioning sleeve can also adopt a V-shaped ceramic sleeve, so that the positioning of the ferrule can be realized.
The first input ferrule 31 and the fourth output ferrule 38 are inserted into the first positioning sleeve 21, the end of the first input ferrule 31 is opposite to the end of the fourth output ferrule 38, and the first positioning sleeve 21 is filled with an index matching fluid.
The third input ferrule 35 and the first output ferrule 32 are inserted into the second positioning sleeve 22, the end of the third input ferrule 35 is opposite to the end of the first output ferrule 32, and the second positioning sleeve 22 is filled with an index matching fluid.
The second input ferrule 33 and the third output ferrule 36 are inserted into the third positioning sleeve 23, the end of the second input ferrule 33 is opposed to the end of the third output ferrule 36, and the third positioning sleeve 23 is filled with an index matching fluid.
The fourth input ferrule 37 and the second output ferrule 34 are inserted into the fourth positioning sleeve 24, an end of the fourth input ferrule 37 is opposite to an end of the second output ferrule 34, and the fourth positioning sleeve 24 is filled with an index matching fluid. The end parts of the input insertion core and the output insertion core are opposite to each other and matched with the refractive index matching fluid, so that light can be efficiently coupled from the input insertion core to the output insertion core.
An annular cavity is formed by the structure, and under the action of the two isolators, light can only pass through the semiconductor optical amplifying device in a single direction and is transmitted anticlockwise as shown in figure 1. At the initial stage of starting the annular cavity, the light spontaneously radiated by the semiconductor optical amplifier passes through the isolator and then reaches the optical filter device. The narrow linewidth spectrum selected by the filter passes through the filter and then enters the first isolator 13, the spectrum is output from the target output end 131 through certain reflection output, a certain proportion of transmission output is output to the semiconductor optical amplifier 12, the semiconductor optical amplifier amplifies the light intensity of the spectrum, the amplified light returns to the semiconductor optical amplifier 12 through the second isolator 14, the optical filter and the first isolator 13 to realize secondary amplification, the process is circulated continuously until the loss of the ring cavity is equal to the gain of the optical amplifier, the loss of the ring cavity comprises the coupling loss of the light beam and the proportion of emergent light, the scanning frequency selection of the optical filter can be driven through controlling the piezoelectric ceramic, and the ring cavity can output a swept optical signal.
In the first embodiment of the tunable laser, the mode of splicing the insertion cores and fixing the positioning sleeve is adopted, and the means of optical fiber fusion is not adopted, so that the length of the optical fiber between the devices can be greatly reduced, the cavity length can be accurately controlled or shortened, and the supported scanning frequency is higher.
Tunable laser second embodiment:
referring to fig. 4, on the basis of the first embodiment, in order to pursue the shortest possible cavity length, the arrangement of the devices and the length of the optical fiber may be further shortened, that is, the optical fiber 311, the optical fiber 321, the optical fiber 331, and the optical fiber 341 are arranged in a bent manner, and the optical fiber is in the maximum bending radius in the required light-transmitting state, and the lengths of the optical fibers at the two ends of the isolator are also shortened as much as possible, so that the cavity length is effectively shortened, and the ring cavity of this embodiment can successfully output the sweep laser with the scanning speed up to 500 kHz.
Third embodiment of tunable laser:
referring to fig. 5, on the basis of the above-mentioned embodiment, the isolator in the first embodiment is removed, the target output end 121 is disposed on the semiconductor optical amplifying device 12, the specific layout of the semiconductor optical amplifying device 12 can be referred to the disclosure of CN111668694A entitled tunable laser, and through the reflective element with a preset proportion, the same-direction amplification output and the reflection-direction amplification output can be realized, and the input end and the output end inside the semiconductor optical amplifying device are both provided with the isolators.
The tunable optical filter 11 may adopt an optical fiber Fabry-Perot filter, the tunable optical filter 11 is provided with a first input ferrule 41 and a first output ferrule 42, the semiconductor optical amplifying device 12 is provided with a second input ferrule 43, a second output ferrule 44 and a target output end 121, the first input ferrule 41 and the second output ferrule 44 are inserted into the first positioning sleeve 45, an end of the first input ferrule 41 is opposite to an end of the second output ferrule 44, the first positioning sleeve 45 is filled with a refractive index matching fluid, the second input ferrule 43 and the first output ferrule 42 are inserted into the second positioning sleeve 46, an end of the second input ferrule 43 is opposite to an end of the first output ferrule 42, and the second positioning sleeve 46 is filled with a refractive index matching fluid.
Through the fixing mode of the inserting core butt joint and the positioning sleeve and the shortest arrangement of the optical fibers, the annular cavity with the short enough cavity length can be built, and then the sweep frequency laser with high scanning frequency can be output.
Fourth embodiment of tunable laser:
referring to fig. 6, on the basis of the first embodiment described above, the isolator 14 in the first embodiment is removed, the tunable laser includes a tunable optical filter 11, a first isolator 13, a first positioning sleeve 59, a second positioning sleeve 57 and a third positioning sleeve 58, the tunable optical filter 11 is provided with a first input ferrule 51 and a first output ferrule 52, the semiconductor optical amplifying device 12 is provided with a second input ferrule 55 and a second output ferrule 56, the first isolator 13 is provided with a third input ferrule 54, a third output ferrule 55 and a target output end, the first input ferrule 51 and the second output ferrule 56 are inserted into the first positioning sleeve 59, an end of the first input ferrule 51 is opposite to an end of the second output ferrule 56, the first positioning sleeve 59 is filled with a refractive index matching liquid, the third input ferrule 54 and the first output ferrule 52 are inserted into the second positioning sleeve 57, the end of the third input ferrule 54 faces the end of the first output ferrule 52, the second positioning sleeve 57 is filled with an index matching fluid, the second input ferrule 55 and the third output ferrule 55 are inserted into the third positioning sleeve 58, the end of the second input ferrule 55 faces the end of the third output ferrule 55, and the third positioning sleeve 58 is filled with an index matching fluid.
By the embodiment, an annular cavity with a long enough short cavity length can be built, and then swept laser with high scanning frequency can be output.
Therefore, the cavity length of the annular cavity is greatly reduced, so that discrete single-frequency laser tuning is effectively realized, and higher-speed swept laser is supported. Of course, the above-mentioned embodiments are only preferred embodiments of the present disclosure, and may have more variations in practical use, for example, the filter may adopt adjustable filters of other forms, as long as the filtering is adjustable, and the form of the isolator is also adjusted according to practical requirements, and these variations are all within the scope of the present invention.
Claims (10)
1. A short cavity length tunable laser, comprising:
the tunable optical filter is provided with a first input inserting core and a first output inserting core;
the semiconductor optical amplification device is provided with a second input inserting core, a second output inserting core and a target output end;
the first positioning sleeve is inserted into the first input ferrule and the second output ferrule, the end part of the first input ferrule is opposite to the end part of the second output ferrule, and the first positioning sleeve is filled with refractive index matching fluid;
the second input ferrule and the first output ferrule are inserted into the second positioning sleeve, the end part of the second input ferrule is opposite to the end part of the first output ferrule, and the second positioning sleeve is filled with refractive index matching fluid.
2. The tunable laser of claim 1, wherein:
the first positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve;
the second positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve.
3. A tuneable laser according to claim 1 or 2, characterised in that:
the tunable optical filter is a fiber Fabry-Perot filter.
4. A short cavity length tunable laser, comprising:
the tunable optical filter is provided with a first input inserting core and a first output inserting core;
the semiconductor optical amplification device is provided with a second input inserting core and a second output inserting core;
a first isolator provided with a third input ferrule, a third output ferrule and a target output end;
the first positioning sleeve is inserted into the first input ferrule and the second output ferrule, the end part of the first input ferrule is opposite to the end part of the second output ferrule, and the first positioning sleeve is filled with refractive index matching fluid;
the third input ferrule and the first output ferrule are inserted into the second positioning sleeve, the end part of the third input ferrule is opposite to the end part of the first output ferrule, and the second positioning sleeve is internally filled with refractive index matching fluid;
the second input ferrule and the third output ferrule are inserted into the third positioning sleeve, the end part of the second input ferrule is opposite to the end part of the third output ferrule, and the third positioning sleeve is filled with refractive index matching fluid.
5. The tunable laser of claim 4, wherein:
the first positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve;
the second positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve;
the third positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve.
6. A tuneable laser according to claim 4 or 5, characterised in that:
the tunable optical filter is a fiber Fabry-Perot filter.
7. A short cavity length tunable laser, comprising:
the tunable optical filter is provided with a first input inserting core and a first output inserting core;
the semiconductor optical amplification device is provided with a second input inserting core and a second output inserting core;
a first isolator provided with a third input ferrule, a third output ferrule and a target output end;
a second isolator provided with a fourth input ferrule and a fourth output ferrule;
the first positioning sleeve is inserted into the first input ferrule and the fourth output ferrule, the end part of the first input ferrule is opposite to the end part of the fourth output ferrule, and the first positioning sleeve is filled with refractive index matching fluid;
the third input ferrule and the first output ferrule are inserted into the second positioning sleeve, the end part of the third input ferrule is opposite to the end part of the first output ferrule, and the second positioning sleeve is internally filled with refractive index matching fluid;
the second input ferrule and the third output ferrule are inserted into the third positioning sleeve, the end part of the second input ferrule is opposite to the end part of the third output ferrule, and the third positioning sleeve is internally filled with refractive index matching fluid;
the fourth input ferrule and the second output ferrule are inserted into the fourth positioning sleeve, the end part of the fourth input ferrule is opposite to the end part of the second output ferrule, and the fourth positioning sleeve is filled with refractive index matching fluid.
8. The tunable laser of claim 7, wherein:
the first positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve;
the second positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve;
the third positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve;
the fourth positioning sleeve adopts a C-shaped ceramic sleeve or a V-shaped ceramic sleeve.
9. The tunable laser of claim 7, wherein:
the tunable optical filter is a fiber Fabry-Perot filter.
10. A tuneable laser according to anyone of claims 7 to 9, characterised in that:
the first isolator is an isolator with a reflective output, and the target output is located at the reflective output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022271966.2U CN212935134U (en) | 2020-10-13 | 2020-10-13 | Tunable laser with short cavity length |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022271966.2U CN212935134U (en) | 2020-10-13 | 2020-10-13 | Tunable laser with short cavity length |
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| Publication Number | Publication Date |
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| CN212935134U true CN212935134U (en) | 2021-04-09 |
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| CN202022271966.2U Active CN212935134U (en) | 2020-10-13 | 2020-10-13 | Tunable laser with short cavity length |
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