A coupling device for a glass-based waveguide and an end face treatment method thereof

Abstract

The present invention discloses a coupling device and an end face processing method for a glass-based waveguide. The coupling device includes an optical part, an automatic optical waveguide coupling device, and a glass-based waveguide chip; the optical part includes a light source, M attenuators, an automatic 1*4 optical switch, and a polarization scrambler connected in sequence, and the polarization scrambler is connected to the pigtail of the glass-based waveguide chip through an optical fiber jumper; the automatic optical waveguide coupling device includes a product clamping fixture, an active region photodetector, and a coupling program, the product clamping fixture is installed on a manual sliding table, and the active region photodetector is installed at the receiving end; the dummy light region of the glass-based waveguide chip is subjected to coating treatment or the waveguide region and the dummy light region are ground at different angles. The present invention effectively solves the problems in the prior art that the coupling value of the glass-based optical waveguide product cannot reach the required value; the coupling efficiency of the fiber array method is low; it is easy to damage the waveguide, etc. It significantly improves the operation difficulty, yield, coupling efficiency, etc. during the operation process, and effectively reduces the test difficulty and production cost of the product.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technologies, and mainly relates to a glass-based planar waveguide, in particular to a coupling device for a glass-based waveguide and an end face treatment method therefor. Background Art

[0002] In the traditional coupling devices and methods for glass-based planar waveguides in the field of optical fiber communication technologies, it is very difficult to achieve fast coupling during actual coupling operations. Either the coupling fails because a large-diameter active region optical probe is used to couple to false light, or the coupling efficiency is extremely low because a four-core optical fiber array is used; moreover, since most of the currently used receiving optical waveguides need to be ground to 90°, 41°, or 42.5° at the front end, the four-core optical fiber array method is likely to cause damage to the waveguide layer and lose its function. On the other hand, the traditional coupling devices and methods cannot quickly switch the light source type, resulting in low efficiency. Summary of the Invention

[0003] To solve the problems of low coupling efficiency, slow switching speed of different light source types, easy damage to the waveguide area of the product, and relatively large deviation in product insertion loss testing of the above-mentioned existing coupling devices and methods, the present invention provides a coupling device and method for a glass-based waveguide.

[0004] To achieve the above object, the present invention provides a coupling device for a glass-based waveguide, which is characterized by comprising an optical part, an automatic optical waveguide coupling device, and a glass-based waveguide chip;

[0005] The optical part is arranged on the automatic optical waveguide coupling device. The optical part includes a light source, M attenuators, an automatic 1*4 optical switch, and a polarization scrambler, where M is the number of different wavelength light sources emitted by the light source. The M wavelength light sources and the M attenuators are respectively connected in one-to-one correspondence through optical fiber jumpers. The M attenuators are respectively connected to the automatic 1*4 optical switch through optical fiber jumpers. The automatic 1*4 optical switch is connected to the polarization scrambler through an optical fiber jumper. The polarization scrambler is connected to the tail fiber of the glass-based waveguide chip through an optical fiber jumper. The optical fiber interface type of the optical part is FC / APC;

[0006] The automatic optical waveguide coupling device includes a product clamping fixture, an active region optical detector, and a coupling program. The product clamping fixture is used to position and clamp the glass-based waveguide chip, and is installed on the manual slide of the automatic optical waveguide coupling device. The active region optical detector is installed at the receiving end of the automatic optical waveguide coupling device. The active region optical detector and the coupling program cooperate with the corresponding glass-based waveguide chip;

[0007] The false light area of the glass-based waveguide chip is subjected to coating treatment or the waveguide area and the false light area are ground at different angles, so that the extinction ratio of the actual light to the stray light is greater than 10 dB.

[0008] As a further improvement of the present technology, when the right end face of the glass-based waveguide chip forms an angle of 90° with the horizontal plane, the coating treatment is to deposit an anti-reflection film on the right end face of the false light area of the glass-based waveguide chip, which is used to increase the reflected light of stray light, so that the extinction ratio of the actual light to the stray light is greater than 10 dB;

[0009] When the right end face of the glass-based waveguide chip forms an angle of 41° or 42.5° with the horizontal plane, the coating treatment is to deposit an anti-reflection film on the right end face of the false light area of the glass-based waveguide chip, which is used to increase the transmitted light of stray light, so that the extinction ratio of the actual light to the stray light is greater than 10 dB.

[0010] As a further improvement of the present technology, when the right end face of the glass-based waveguide chip forms an angle of 90° with the horizontal plane, the different-angle grinding treatment of the waveguide area and the false light area is to grind the right end face of the false light area of the glass-based waveguide chip into an angle of 40-45° with the horizontal plane;

[0011] When the right end face of the glass-based waveguide chip forms an angle of 41° or 42.5° with the horizontal plane, the different-angle grinding treatment of the waveguide area and the false light area is to grind the right end face of the false light area of the glass-based waveguide chip into an angle of 46-50° with the horizontal plane.

[0012] As a further improvement of the present technology, the product clamping fixture includes a positioning plate, a vacuum chuck, and an elastic side-pushing fixture. The positioning plate is arranged on the left side of the vacuum chuck for product positioning. The lower bottom surface of the product is attached to the upper plane of the vacuum chuck. A plurality of air suction holes are provided on the upper side wall of the vacuum chuck and communicated with the vacuum chamber for adsorbing the product on the vacuum chuck to fix it and keep the product horizontal. The elastic side-pushing fixture is arranged on the right side of the product for clamping the product, and includes a chuck and a compression spring.

[0013] As a further improvement of the present technology, the photodetector is a self-made epitaxial large-diameter active area photodetector. The self-made epitaxial large-diameter active area photodetector includes an optical power meter, a PD detection head, and a resistor. The optical power meter is connected to the resistor through an epitaxial shielded wire. The resistor is connected to the PD detection head through an epitaxial shielded wire. The PD detection head uses a PD detection head with a diameter of φ4-φ6 mm. The resistor is set to 1-10 KΩ for amplifying the signal. The distance between the PD detection head and the light source output end of the waveguide area of the glass-based waveguide chip is set to 1-5 mm. A protective housing is provided outside the resistor and the PD detection head.

[0014] As a further improvement of the present technology, the optical part includes two or more different types of light sources, each of which emits M different wavelength light sources. The M different wavelength light sources of each light source are respectively connected to M 1*N manual optical switches one-to-one through fiber optic jumpers, and the M 1*N manual optical switches are respectively connected to M attenuators one-to-one through fiber optic jumpers.

[0015] As a further improvement of the present technology, multiple automatic optical waveguide coupling devices are provided, and a set of optical components are provided on each of the automatic optical waveguide coupling devices. The optical components include M manual 1*N optical switches, M attenuators, an automatic 1*4 optical switch, and a polarization maintaining device, which are sequentially connected through fiber optic jumpers. The M manual 1*N optical switches are connected to the M attenuators one-to-one, and the polarization maintaining device is connected to the pigtail of the glass-based waveguide chip through a fiber optic jumper;

[0016] The optical part includes two or more different types of light sources, each of which emits M different wavelength light sources. Each wavelength light source emitted by each light source is respectively connected to a 1*N wavelength division multiplexer through a fiber optic jumper. The 1*N wavelength division multiplexer can divide the light of the same wavelength into multiple paths with a fixed splitting ratio, and is respectively connected to a 1*N manual optical switch of each optical component one-to-one, so that each type of light source can be used simultaneously for multiple glass-based waveguide chip coupling tests by multiple automatic optical waveguide coupling devices.

[0017] The present invention also provides a method for coating the end face of a glass-based waveguide chip, which is characterized in that: the glass-based waveguide chip is the glass-based waveguide chip to be coupled in the above-mentioned coupling device of the glass-based waveguide. Through computer optical simulation, the distribution area of stray light within the coupling tolerance of ±100um between the pigtail and the glass-based waveguide chip is found. The distribution area of the stray light is collectively referred to as the false light area. Coating treatment is carried out on the right end face of the false light area to make the extinction ratio between the actual light and the stray light greater than 10dB;

[0018] When the included angle between the right end face of the glass-based waveguide chip and the horizontal plane is 90°, the coating treatment is to deposit an anti-reflection film on the right end face of the false light area of the glass-based waveguide chip to increase the reflected light of the stray light, so as to achieve an extinction ratio between the actual light and the stray light greater than 10dB;

[0019] When the included angle between the right end face of the glass-based waveguide chip and the horizontal plane is 41° or 42.5°, the coating treatment is to deposit an anti-reflection film on the right end face of the false light area of the glass-based waveguide chip to increase the transmitted light of the stray light, so as to achieve an extinction ratio between the actual light and the stray light greater than 10dB.

[0020] The present invention also provides a method for grinding the end faces of a glass-based waveguide chip at different angles, which is characterized in that: the glass-based waveguide chip is the glass-based waveguide chip to be coupled in the coupling device of the above-mentioned glass-based waveguide. Through computer optical simulation, the distribution area of stray light within the coupling tolerance of ±100um between the pigtail and the glass-based waveguide chip is found. The distribution area of the stray light is collectively referred to as the false light area. Different angle grinding treatments are performed on the waveguide area and the false light area to make the extinction ratio of the actual light to the stray light greater than 10dB;

[0021] When the included angle between the right end face of the glass-based waveguide chip and the horizontal plane is 90°, the different angle grinding treatment of the waveguide area and the false light area is to grind the right end face of the false light area of the glass-based waveguide chip into an included angle of 40-45° with the horizontal plane;

[0022] When the included angle between the right end face of the glass-based waveguide chip and the horizontal plane is 41° or 42.5°, the different angle grinding treatment of the waveguide area and the false light area is to grind the right end face of the false light area of the glass-based waveguide chip into an included angle of 46-50° with the horizontal plane.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. The present invention effectively solves the problems in the prior art such as the coupling value not being reached for glass-based optical waveguide products, low coupling efficiency in the fiber array method, and easy damage to the waveguide. It has obvious improvements in the operation difficulty, yield, coupling efficiency, etc. during the operation process, effectively reducing the test difficulty and production cost of the product;

[0025] 2. The traditional optical path part cannot use multiple types of light sources simultaneously or requires a long time for light source switching, with relatively low efficiency. However, the optical part of the present invention uses a manual 1*N optical switch to quickly switch the light source type, and the present invention uses an attenuator to adjust the output light of each channel to be consistent to avoid re-zeroing after light source switching, which can ensure efficient switching between different light source types in the entire optical part and improve the efficiency;

[0026] 3. The 1*N wavelength division multiplexer is used to decompose different wavelengths of the light source into multiple channels, so that one light source can be used for multiple devices, improving the utilization rate of the devices;

[0027] 4. The glass-based waveguide chip of the present invention is treated with a special process. Through computer optical simulation, the false light area is found, and then coating treatment is performed on the false light area or different angle grinding processes are performed on the waveguide area and the false light area. The processed glass-based waveguide can achieve coupling with very high coupling efficiency. At the same time, the waveguide area is protected, and the deviation between the insertion loss during testing and the actual use of the product is very small, improving the accuracy of the test. Brief Description of the Drawings

[0028] Figure 1 Schematic diagram of the optical part structure of the first embodiment of the present invention;

[0029] Figure 2 Top view structure diagram of the product clamping fixture and the self-made epitaxial large-diameter active region photodetector of the first embodiment of the present invention;

[0030] Figure 3 Front view structure diagram of the product clamping fixture of the first embodiment of the present invention;

[0031] Figure 4 Schematic diagram of the optical part structure of the second embodiment of the present invention;

[0032] Figure 5 Optical path schematic diagram of the existing technology glass-based waveguide chip (the right end face is 90° and 41°);

[0033] Figure 6 Optical path schematic diagram of the false light area coating treatment of the glass-based waveguide chip (the right end face is 90° and 41°) of the present invention;

[0034] Figure 7 Optical path schematic diagram of the waveguide area and the false light area of the glass-based waveguide chip (the right end face is 90° and 41°) of the present invention with different angle treatments;

[0035] In the figure: 1. CWDM light source, 2. LAN-WDM light source, 3. 1*N wavelength division multiplexer, 4. Manual 1*N optical switch, 5. Attenuator, 6. Automatic 1*4 optical switch, 7. Polarization scrambler, 8. Product clamping fixture, 801. Positioning plate, 802. Vacuum chuck, 8021. Suction hole, 803. Chuck, 804. Spring, 9. Self-made epitaxial large-diameter active region photodetector, 901. Optical power meter, 902. Resistor, 903. PD detection head, 904. Protection shell, 905. Shielding wire, 10. Glass-based waveguide chip, 11. Waveguide area, 12. Actual optical path, 13. False light area, 14. False optical path. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] The first embodiment of the present invention includes an optical part, an automatic optical waveguide coupling device, and a glass-based waveguide chip 10;

[0038] The optical part is installed on the automatic optical waveguide coupling device, such as Figure 1As shown in the figure, the optical part includes a CWDM light source 1, a LAN-WDM light source 2, four manual 1*N optical switches 4, four attenuators 5, an automatic 1*4 optical switch 6, and a polarization scrambler 7. The CWDM light source 1 can emit light sources of four wavelengths (1271 nm, 1291 nm, 1311 nm, and 1331 nm respectively), and the LAN-WDM light source 2 can emit light sources of four wavelengths (1295.56 nm, 1300.06 nm, 1304.59 nm, and 1309.14 nm respectively). The four different wavelength light sources of each light source are respectively connected to the four 1*N manual optical switches 4 in one-to-one correspondence through four fiber jumpers. The four 1*N manual optical switches 4 are respectively connected to the four attenuators 5 in one-to-one correspondence through fiber jumpers. The four attenuators 5 are all connected to the 1*4 automatic optical switch through fiber jumpers. The 1*4 automatic optical switch is connected to the polarization scrambler 7 through a fiber jumper. The polarization scrambler 7 is connected to the pigtail of the glass fundamental waveguide chip 10 through a fiber jumper, so as to ensure that light enters the glass fundamental waveguide chip 10; the fiber interface type of the optical part is FC / APC;

[0039] The interface type is FC / APC to reduce the docking loss between optical devices. At the same time, since the end face of the interface fiber is at an 8° angle, the back reflection loss can be reduced, thus avoiding the influence of back reflection on the light source.

[0040] The function of the manual 1*N optical switch 4 is to connect to light sources of different types / different wavelengths, so that the function of quickly switching different types of light sources can be achieved by simply pressing the switching button on the manual 1*N optical switch 4; the function of the attenuator 5 is to ensure that the optical signal power of each path is consistent by adjusting the attenuator, thus avoiding the optical power returning to zero again when switching light sources, and improving the light source switching efficiency; the function of the automatic 1*4 optical switch 6 is to ensure that only one wavelength of light enters the product each time, so as to avoid optical crosstalk between different optical wavelengths; the function of the polarization scrambler 7 is to test the polarization-dependent loss of the glass fundamental waveguide chip 10.

[0041] The automatic optical waveguide coupling device includes a product clamping fixture 8, a self-made epitaxial large-diameter active area photodetector 9, and a coupling program, such as Figure 2 、 3As shown in the figure, the product clamping fixture 8 is used to position, clamp and fix the glass waveguide chip 10, and is installed on the manual slide of the automatic optical waveguide coupling device. The product clamping fixture 8 includes a positioning plate 801, a vacuum chuck 802 and an elastic side-pushing fixture. The positioning plate 801 is arranged on the left side of the vacuum chuck 802 and is used for positioning the product (i.e., the glass waveguide chip 10). The lower bottom surface of the product is attached to the upper plane of the vacuum chuck 802. A plurality of suction holes 8021 are provided on the upper side wall of the vacuum chuck 802 and are connected to the vacuum chamber, which is used to adsorb and fix the product on the vacuum chuck 802 to keep the product horizontal. The elastic side-pushing fixture is arranged on the right side of the product and is used to clamp the product, including a chuck 803 and a compression spring 804. The product clamping fixture 8 can ensure the consistency of clamping the glass waveguide chip 10 each time to improve the coupling efficiency.

[0042] The self-made epitaxial large-diameter active area photodetector 9 is installed at the receiving end of the automatic optical waveguide coupling device. The self-made epitaxial large-diameter active area photodetector 9 and the coupling program cooperate with different glass waveguide chips 10;

[0043] As Figure 2 shown in the figure, the self-made epitaxial large-diameter active area photodetector 9 includes a optical power meter 901, a PD detection head 903 and a resistor 902. The optical power meter 901 is connected to the resistor 902 through an epitaxial shielded wire 905, and the resistor 902 is connected to the PD detection head 903 through an epitaxial shielded wire 905. The PD detection head 903 uses a PD detection head with a diameter of φ4 - φ6mm. The resistor 902 is set to 1KΩ and is used to amplify the signal. The distance H between the PD detection head 903 and the light source emission end of the waveguide area of the glass waveguide chip 10 is set to 1 - 5mm. A protective housing 904 is provided outside the resistor 902 and the PD detection head 903.

[0044] The PD detection head 903 is installed at the receiving end of the automatic optical waveguide coupling device through a PD detection head clamping fixture (not shown in the figure). The PD detection head 903 has multiple specifications and models to match different glass waveguide chips 10 to achieve versatility, and can be quickly switched through multiple PD detection head clamping fixtures.

[0045] The dummy light area of the glass waveguide chip 10 is treated by coating or the waveguide area and the dummy light area are ground at different angles, so that the extinction ratio of the actual light to the stray light is greater than 10dB.

[0046] As Figure 6As shown in (a) of the figure, one embodiment of the end-face coating treatment method of the glass-based waveguide chip 10 of the present invention: Connect the optical part, the automatic optical waveguide coupling device and the computer for communication. The glass-based waveguide chip 10 finds the distribution area of stray light within the coupling tolerance of ±100um between the pigtail and the glass-based waveguide chip 10 through computer optical simulation. The distribution area of stray light is collectively referred to as the false light area 13. The angle between the right end face of the glass-based waveguide chip 10 and the horizontal plane is 90°. The coating treatment is to deposit an antireflection film on the right end face of the false light area 13 of the glass-based waveguide chip 10 to increase the reflected light of the stray light, so that the stray light is reflected back from the false light area 13 (see Figure 6 the false light optical path 14 in (a)), and the actual light is horizontally transmitted out from the right end face of the waveguide area (see Figure 6 the actual light optical path 12 in (a)), and is received by the self-made epitaxial large-diameter active area photodetector 9, achieving an extinction ratio of the actual light to the stray light greater than 10dB, thus being easy to couple, improving the coupling efficiency and protecting the waveguide area 11 at the same time.

[0047] As Figure 6 shown in (b) of the figure, another embodiment of the end-face coating treatment method of the glass-based waveguide chip 10 of the present invention: Connect the optical part, the automatic optical waveguide coupling device and the computer for communication. The glass-based waveguide chip 10 finds the distribution area of stray light within the coupling tolerance of ±100um between the pigtail and the glass-based waveguide chip 10 through computer optical simulation. The distribution area of stray light is collectively referred to as the false light area 13. The angle between the right end face of the glass-based waveguide chip 10 and the horizontal plane is 41°. The coating treatment is to deposit an antireflection film on the right end face of the false light area 13 of the glass-based waveguide chip 10 to increase the transmitted light of the stray light, so that the stray light is transmitted out from the 41° face at the right end of the false light area 13 (see Figure 6 the false light optical path 14 in (b)), and the actual light undergoes total reflection within the waveguide area 11 and is reflected out from above the waveguide area 11 (see Figure 6 the actual light optical path 12 in (b)), and is received by the self-made epitaxial large-diameter active area photodetector 9, so that the actual light and the stray light form a large angle, thus achieving an extinction ratio of the actual light to the stray light greater than 10dB, being easy to couple, improving the coupling efficiency and protecting the waveguide layer 11 at the same time.

[0048] As Figure 7As shown in (a) of Figure 7 , one embodiment of the method for grinding the end face of the glass-based waveguide chip 10 of the present invention: Connect the optical part, the automatic optical waveguide coupling device and the computer for communication. The glass-based waveguide chip 10 is simulated optically by the computer to find the distribution area of stray light within the coupling tolerance of ±100 um between the pigtail and the glass-based waveguide chip 10. The distribution area of stray light is collectively referred to as the false light area 13. Different-angle grinding treatments are performed on the waveguide area 11 and the false light area 13 of the glass-based waveguide chip 10, so that the angle between the right end face of the waveguide area and the horizontal plane is 90°, and the angle α between the right end face of the false light area 13 and the horizontal plane is 40° - 45°. In this way, the actual light will be transmitted out from the right end face of the waveguide area 11 (see Figure 7 the actual light optical path 12 in (a)), and is received by the self-made epitaxial large-diameter active area photodetector 9. The stray light undergoes total internal reflection and is reflected out from above the waveguide area 11 (see

[0049] the false light optical path 14 in (a)); The actual light and the stray light form a relatively large angle, so that the extinction ratio between the actual light and the stray light is greater than 10 dB. Thus, it is easy to couple, the coupling efficiency is improved, and the deviation between the insertion loss during testing and the actual use of the product is very small, improving the accuracy of the test. Figure 7 As shown in (b) of Figure 7 , another embodiment of the method for processing the end face of the glass-based waveguide chip of the present invention: Connect the optical part, the automatic optical waveguide coupling device and the computer for communication. The glass-based waveguide chip 10 is simulated optically by the computer to find the distribution area of stray light within the coupling tolerance of ±100 um between the pigtail and the glass-based waveguide chip 10. The distribution area of stray light is collectively referred to as the false light area 13. Different-angle grinding treatments are performed on the waveguide area 11 and the false light area 13 of the glass-based waveguide chip 10, so that the angle between the right end face of the waveguide area 11 and the horizontal plane is 41°, and the angle α between the right end face of the false light area and the horizontal plane is 46° - 50°. In this way, the actual light will undergo total internal reflection within the waveguide area 11 and be transmitted out from above (see Figure 7 the actual light optical path 12 in (b)), and is received by the self-made epitaxial large-diameter active area photodetector 9. The stray light will not undergo total internal reflection and is transmitted out from the right side (see

[0050] the false light optical path 14 in (b)), so that the actual light and the stray light form a relatively large angle, so that the extinction ratio between the actual light and the stray light is greater than 10 dB. Thus, it is easy to couple, the coupling efficiency is improved, and the deviation between the insertion loss during testing and the actual use of the product is very small, improving the accuracy of the test. Figure 5 The figure shows the optical path schematic diagram of the glass-based waveguide chip in the prior art. As shown in Figure 5As shown in (a), the included angle between the right end face of the glass-based waveguide chip 10 and the horizontal plane is 90°. Both the actual light and the stray light are transmitted out from the right side of the glass-based waveguide chip, so that the PD detector receives both the actual light and part of the stray light, resulting in coupling failure.

[0051] As Figure 5 shown in (b), the included angle between the right end face of the glass-based waveguide chip 10 and the horizontal plane is 41°. Both the actual light and the stray light are totally reflected and reflected out from above the waveguide region 11, so that the PD detector receives both the actual light and part of the stray light, resulting in coupling failure.

[0052] By comparing Figure 5 with Figure 6 and 7 , it can be known that the glass-based waveguide chip 10 of the present invention is processed by a special process. The false light area 13 is found through computer optical simulation, and then the false light area 13 is coated with a film or the waveguide region 11 and the false light area 13 are ground at different angles. After processing, the glass-based waveguide chip 10 can achieve coupling and the coupling efficiency is very high. At the same time, the waveguide region is protected, and the deviation between the insertion loss during testing and the actual use of the product is very small, improving the accuracy of the test.

[0053] As Figure 4 shown, Embodiment 2 of the present invention is basically the same as Embodiment 1, except that: there are multiple automatic optical waveguide coupling devices, and each automatic optical waveguide coupling device is provided with a set of optical components. The optical components include M manual 1*N optical switches 4, M attenuators 5, an automatic 1*4 optical switch 6, and a polarization rotator 7 that are sequentially connected through fiber jumpers. The M manual 1*N optical switches 4 are connected to the M attenuators 5 in a one-to-one correspondence. The polarization rotator 7 is connected to the tail fiber of the glass-based waveguide chip 10 through a fiber jumper;

[0054] Each wavelength light source emitted by the CWDM light source 1 and the LAN-WDM light source 2 is respectively connected to a 1*N wavelength division multiplexer 3 through a fiber jumper. The 1*N wavelength division multiplexer 7 can divide the light of the same wavelength into multiple paths with a fixed splitting ratio and is respectively connected to one of the M manual 1*N optical switches 4 of each optical component in a one-to-one correspondence. The manual 1*N optical switch 4 can quickly switch different light sources through a switching button, so that each light source can be simultaneously used for multiple glass-based waveguide chip 10 coupling tests by multiple automatic optical waveguide coupling devices, thereby improving the coupling test efficiency and equipment utilization rate and reducing the manufacturing cost.

[0055] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A coupling device for a glass-based waveguide, characterized in that It includes an optical part, an automatic optical waveguide coupling device, and a glass-based waveguide chip; The optical part is arranged on the automatic optical waveguide coupling device. The optical part includes a light source, M attenuators, an automatic 1×4 optical switch, and a polarization scrambler. M is the number of light sources with different wavelengths emitted by the light source. The M wavelength light sources and the M attenuators are respectively connected in one-to-one correspondence through optical fiber jumpers. The M attenuators are respectively connected to the automatic 1×4 optical switch through optical fiber jumpers. The automatic 1×4 optical switch is connected to the polarization scrambler through an optical fiber jumper. The polarization scrambler is connected to the pigtail of the glass-based waveguide chip through an optical fiber jumper. The optical interface type of the optical part is FC / APC; The automatic optical waveguide coupling device includes a product clamping fixture, an active region photodetector, and a coupling program. The product clamping fixture is used to position and clamp the glass-based waveguide chip and is installed on the manual slide of the automatic optical waveguide coupling device. The active region photodetector is installed at the receiving end of the automatic optical waveguide coupling device. The active region photodetector and the coupling program cooperate with the corresponding glass-based waveguide chip; The false light region of the glass-based waveguide chip is subjected to coating treatment or the waveguide region and the false light region are ground at different angles, so that the extinction ratio of the actual light to the stray light is greater than 10 dB.

2. The coupling device of a glass-based waveguide according to claim 1, characterized in that: When the right end face of the glass-based waveguide chip forms an angle of 90° with the horizontal plane, the coating treatment is to deposit an anti-reflection film on the right end face of the false light region of the glass-based waveguide chip, which is used to increase the reflected light of the stray light, so as to achieve an extinction ratio of the actual light to the stray light greater than 10 dB; When the right end face of the glass-based waveguide chip forms an angle of 41° or 42.5° with the horizontal plane, the coating treatment is to deposit an anti-reflection film on the right end face of the false light region of the glass-based waveguide chip, which is used to increase the transmitted light of the stray light, so as to achieve an extinction ratio of the actual light to the stray light greater than 10 dB.

3. A coupling device for a glass-based waveguide according to claim 1, characterized in that: When the right end face of the glass-based waveguide chip forms an angle of 90° with the horizontal plane, the different angle grinding treatment of the waveguide region and the false light region is to grind the right end face of the false light region of the glass-based waveguide chip into an angle of 40 - 45° with the horizontal plane; When the right end face of the glass-based waveguide chip forms an angle of 41° or 42.5° with the horizontal plane, the different angle grinding treatment of the waveguide region and the false light region is to grind the right end face of the false light region of the glass-based waveguide chip into an angle of 46 - 50° with the horizontal plane.

4. A coupling device for a glass-based waveguide according to claim 1, characterized in that: The product clamping fixture includes a positioning plate, a vacuum chuck, and an elastic side-pushing fixture. The positioning plate is arranged on the left side of the vacuum chuck for product positioning. The lower bottom surface of the product is attached to the upper plane of the vacuum chuck. A plurality of air suction holes are provided on the upper side wall of the vacuum chuck and are communicated with the vacuum chamber, which is used to adsorb and fix the product on the vacuum chuck to keep the product horizontal. The elastic side-pushing fixture is arranged on the right side of the product and is used to clamp the product, including a chuck and a compression spring.

5. A coupling device for a glass-based waveguide according to claim 1, characterized in that: The photodetector is a self-made epitaxial large-diameter active-region photodetector, which includes an optical power meter, a PD detection head, and a resistor. The optical power meter is connected to the resistor through an epitaxial shielded wire, the resistor is connected to the PD detection head through an epitaxial shielded wire. The PD detection head uses a PD detection head with a diameter of φ4 - φ6 mm. The resistor is set to 1 - 10 KΩ and is used to amplify the signal. The distance between the PD detection head and the waveguide region light source output end of the glass fundamental waveguide chip is set to 1 - 5 mm. A protective shell is provided outside the resistor and the PD detection head.

6. The coupling device of a glass-based waveguide according to claim 1, characterized in that: The optical part includes two or more different types of light sources. Each light source emits M different wavelength light sources. Each of the M different wavelength light sources of each light source is respectively connected to one of M 1*N manual optical switches through an optical fiber jumper. The M 1*N manual optical switches are respectively connected to M attenuators through optical fiber jumpers.

7. The coupling device of a glass-based waveguide according to claim 1, characterized in that: There are multiple sets of the automatic optical waveguide coupling devices. Each set of the automatic optical waveguide coupling devices is provided with a set of optical components. The optical components include M manual 1*N optical switches, M attenuators, an automatic 1*4 optical switch, and a polarization maintaining device, which are sequentially connected through optical fiber jumpers. The M manual 1*N optical switches are connected to the M attenuators in one-to-one correspondence. The polarization maintaining device is connected to the pigtail of the glass fundamental waveguide chip through an optical fiber jumper. The optical part includes two or more different types of light sources. Each light source emits M different wavelength light sources. Each wavelength light source emitted by each light source is respectively connected to one 1*N wavelength division multiplexer through an optical fiber jumper. The 1*N wavelength division multiplexer divides the light of the same wavelength into multiple paths with a fixed splitting ratio and is respectively connected to one of the 1*N manual optical switches of each optical component in one-to-one correspondence, so that each type of light source can be simultaneously used for multiple automatic optical waveguide coupling devices to perform coupling tests on multiple glass fundamental waveguide chips.

8. A method for coating the end face of a glass-based waveguide chip, characterized in that: The glass fundamental waveguide chip is the glass fundamental waveguide chip to be coupled in the coupling device of the glass fundamental waveguide according to any one of claims 1 - 7. The distribution area of stray light within the coupling tolerance of ±100 μm between the pigtail and the glass fundamental waveguide chip is found through computer optical simulation. The distribution area of the stray light is collectively referred to as the false light area. Coating treatment is performed on the right end face of the false light area to make the extinction ratio of the actual light to the stray light greater than 10 dB. When the included angle between the right end face of the glass fundamental waveguide chip and the horizontal plane is 90°, the coating treatment is to deposit an anti-reflection film on the right end face of the false light area of the glass fundamental waveguide chip to increase the reflected light of the stray light and achieve an extinction ratio of the actual light to the stray light greater than 10 dB. When the included angle between the right end face of the glass fundamental waveguide chip and the horizontal plane is 41° or 42.5°, the coating treatment is to deposit an anti-reflection film on the right end face of the false light area of the glass fundamental waveguide chip to increase the transmitted light of the stray light and achieve an extinction ratio of the actual light to the stray light greater than 10 dB.

9. A method for grinding and processing the end face of a glass-based waveguide chip at different angles, characterized in that: The glass-based waveguide chip is the glass-based waveguide chip to be coupled in the coupling device of the glass-based waveguide described in any one of claims 1-7. The distribution area of stray light within the coupling tolerance of ±100 μm between the pigtail and the glass-based waveguide chip is found through computer optical simulation. The distribution area of the stray light is collectively referred to as the false light area. Different angle grinding treatments are performed on the waveguide area and the false light area to make the extinction ratio of the actual light to the stray light greater than 10 dB; When the right end face of the glass-based waveguide chip forms an angle of 90° with the horizontal plane, the different angle grinding treatment of the waveguide area and the false light area is to grind the right end face of the false light area of the glass-based waveguide chip into an angle of 40-45° with the horizontal plane; When the right end face of the glass-based waveguide chip forms an angle of 41° or 42.5° with the horizontal plane, the different angle grinding treatment of the waveguide area and the false light area is to grind the right end face of the false light area of the glass-based waveguide chip into an angle of 46-50° with the horizontal plane.

Images